State Street Institutional Investment Trust

As filed with the U.S. Securities and Exchange Commission on April 25, 2025

1933 Act File No. 333-30810
1940 Act File No. 811-09819

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-1A
REGISTRATION STATEMENT

UNDER THE SECURITIES ACT OF 1933	☒
Post-Effective Amendment No. 312	☒

and/or

REGISTRATION STATEMENT

UNDER THE INVESTMENT COMPANY ACT OF 1940	☒
Amendment No. 314	☒

STATE STREET INSTITUTIONAL INVESTMENT TRUST

(Exact Name of Registrant as Specified in Charter)

One Iron Street
Boston, Massachusetts 02210

(Address of Principal Executive Offices)

(617) 664-3920

(Registrant's Telephone Number)

Andrew J. DeLorme, Esq.
Chief Legal Officer

c/o SSGA Funds Management, Inc.
One Iron Street
Boston, Massachusetts 02210

(Name and Address of Agent for Service)

Copies to:

Adam M. Schlichtmann, Esq.
Ropes & Gray LLP
Prudential Tower, 800 Boylston Street
Boston, Massachusetts 02199-3600

It is proposed that this filing will become effective:

☐	immediately upon filing pursuant to Rule 485, paragraph (b)
☒	on April 30, 2025 pursuant to Rule 485, paragraph (b)
☐	60 days after filing pursuant to Rule 485, paragraph (a)(1)
☐	on _________________ pursuant to Rule 485, paragraph (a)(1)
☐	75 days after filing pursuant to Rule 485, paragraph (a)(2)
☐	on __________ pursuant to Rule 485, paragraph (a)(2)

If appropriate, check the following box:

☐	This post-effective amendment designates a new effective date for a previously filed post-effective amendment.

Prospectus

April 30, 2025

State Street Institutional
Investment Trust

State Street Aggregate Bond Index Fund

Class A (SSFCX) Class I (SSFDX) Class K (SSFEX)

State Street Equity 500 Index Fund

Class A (SSSVX) Class I (SSSWX) Class K (SSSYX)

State Street Global All Cap Equity ex-U.S. Index Fund

Class A (SSGHX) Class I (SSGJX) Class K (SSGLX)

State Street Small/Mid Cap Equity Index Fund

Class A (SSMJX) Class I (SSMLX) Class K (SSMKX)

The U.S. Securities and Exchange Commission and the U.S. Commodity Futures Trading Commission have not approved or disapproved these securities or passed upon the adequacy of this Prospectus. Any representation to the contrary is a criminal offense.

An investment in any of the Funds offered by this Prospectus is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Each Fund may offer multiple classes of shares. This Prospectus covers only the Class A, Class I and Class K Shares of the Funds.

TABLE OF CONTENTS

Fund Summaries	1
State Street Aggregate Bond Index Fund	1
State Street Equity 500 Index Fund	9
State Street Global All Cap Equity ex-U.S. Index Fund	16
State Street Small/Mid Cap Equity Index Fund	26
Additional Information About Investment Objectives, Principal Strategies and Risks	34
Additional Information About Non-Principal Investment Strategies and Risks	53
Portfolio Holdings Disclosure	55
Management and Organization	56
Shareholder Information	60
Dividends, Distributions and Tax Considerations	73
Financial Intermediary Arrangements	75
Financial Highlights	78
Index/Trademark Licenses/Disclaimers	91

State Street Aggregate Bond Index Fund

Investment Objective

The State Street Aggregate Bond Index Fund (the “Aggregate Bond Index Fund” or the “Fund”) seeks to provide investment results that, before fees and expenses, correspond generally to the price and yield performance of an index that tracks the U.S. dollar denominated investment grade bond market over the long term.

Fees and Expenses of the Fund

The tables below describe the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund (“Fund Shares”). You may pay other fees, such as brokerage commissions and other fees to financial intermediaries which are not reflected in the tables and examples below. You may qualify for sales charge discounts on purchases of Class A shares if you agree to invest in the future, or if you and your family currently invest, at least $100,000 in State Street Funds that offer Class A shares. More information about these and other discounts is available from your financial intermediary (“Financial Intermediary”) and in Choosing a Share Class – Reducing Your Class A Sales Charge on page 63 of the Fund's Prospectus. The expenses shown in the table and the Example reflect the expenses of both the Fund and the Fund's proportionate share of the expenses of State Street Aggregate Bond Index Portfolio (the “Aggregate Bond Index Portfolio” or sometimes referred to in context as the “Portfolio”).

Shareholder Fees (fees paid directly from your investment)

	Class A	Class I	Class K
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	3.75%	None	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None1	None	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

	Class A	Class I	Class K
Management Fee	0.025%	0.025%	0.025%
Distribution and/or Shareholder Service (12b-1) Fees	0.250%	0.000%	0.000%
Other Expenses2	0.311%	0.311%	0.111%
Total Annual Fund Operating Expenses	0.586%	0.336%	0.136%
Less Fee Waivers and/or Expense Reimbursements3,4	(0.111%)	(0.111%)	(0.111%)
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	0.475%	0.225%	0.025%

A contingent deferred sales charge (“CDSC”) of 1.00% may be assessed on redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1,000,000 or more.

Other Expenses have been restated to reflect current fees.

The Fund's investment adviser, SSGA Funds Management, Inc. (the “Adviser” or “SSGA FM”), is contractually obligated until April 30, 2026, separately with respect to each of the Fund and the Portfolio, (i) to waive up to the full amount of the advisory fee payable by the Fund or the Portfolio, and/or (ii) to reimburse the Fund or the Portfolio to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, extraordinary expenses, and distribution, shareholder servicing, and sub-transfer agency fees) exceed 0.025% of the Fund's or the Portfolio's average daily net assets on an annual basis (for avoidance of doubt, the waiver and/or reimbursement is inclusive of all the allocation of expenses from the Portfolio). This waiver and/or reimbursement may not be terminated prior to April 30, 2026 except with approval of the Fund's/Portfolio's Board of Trustees.

SSGA FM is contractually obligated to waive up to the portion of the management fee and/or expenses attributable to acquired fund fees and expenses in connection with the Portfolio's investments in acquired funds held for other than cash management purposes. This fee waiver and/or expense reimbursement may only be terminated with approval of the Fund's/Portfolio's Board of Trustees.

Example:

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated, and then sell or hold all of your Fund Shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. The calculation of costs for the one-year period takes into account the effect of any current contractual fee waivers and/or reimbursements; and the calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of each such period. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

	1 year	3 years	5 years	10 years
Class A	$422	$545	$679	$1,070
Class I	$23	$97	$178	$415
Class K	$3	$33	$65	$163

Portfolio Turnover:

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). As a shareholder of the Aggregate Bond Index Portfolio, the Fund bears its ratable share of the transaction costs associated with the portfolio turnover of the Portfolio. A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund Shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 16% of the average value of its portfolio.

Principal Investment Strategies

The Fund is an “index” fund that seeks to track, before fees and expenses, the total return performance of the Bloomberg U.S. Aggregate Bond Index (the “U.S. Aggregate Bond Index” or sometimes referred to in context as the “Index”) over the long term. As an “index” fund, the Fund is not managed according to traditional methods of “active” investment management, which involve the buying and selling of securities based upon economic, financial and market analysis and investment judgment.

In seeking to track the performance of the Index, the Fund employs a sampling strategy, which means that the Fund will not typically purchase all of the securities represented in the Index. Instead, the Fund may purchase a subset of the securities in the Index, or securities the Adviser considers to be comparable to securities in the Index, in an effort to hold a portfolio of securities with generally the same risk and return characteristics of the Index. The number of holdings in the Fund will be based on a number of factors, including asset size of the Fund. SSGA Funds Management, Inc. (“SSGA FM” or the “Adviser”), the investment adviser to the Fund, generally expects the Fund to hold fewer than the total number of securities in the Index, but reserves the right to hold as many securities as it believes necessary to achieve the Fund's investment objective.

Under normal circumstances, the Fund generally invests substantially all, but at least 80%, of its net assets (plus borrowings, if any) in securities comprising the Index or in securities that the Adviser determines have economic characteristics that are comparable to the economic characteristics of securities that comprise the Index. The notional value of the Fund's investments in derivatives or other synthetic instruments that provide exposures comparable, in the judgment of the Adviser, to investments in the Index may be counted toward satisfaction of this 80% policy. The Fund will provide shareholders with at least sixty (60) days' notice prior to any change in this 80% investment policy. The Fund may also invest in other debt securities, cash and cash equivalents or money market instruments, such as repurchase agreements and money market funds (including money market funds advised by the Adviser).

The Fund may at times purchase or sell futures contracts on fixed-income securities, or options on those futures, in lieu of investing directly in fixed-income securities themselves. The Fund may also purchase or sell futures contracts and related options on the Index (or other fixed-income securities indices). The Fund might do so, for example, in order to adjust the interest-rate sensitivity of the Fund to bring the characteristics of the Fund more closely in line with those of the Index. It might also do so to increase its investment exposure pending investment of cash in bonds or other investments or to reduce its investment exposure in situations where it intends to sell a portion of the securities in its portfolio but the sale has not yet been completed. The Fund may also enter into other derivatives transactions, including the use

of options or swap transactions, in lieu of investing directly in the stocks making up the Index. The Fund may, to the extent permitted by applicable law, invest in shares of other mutual funds whose investment objectives and policies are similar to those of the Fund (including funds advised by the Adviser).

The Index is designed to measure the performance of the U.S. dollar denominated investment grade bond market, which includes investment grade (must be Baa3/BBB-/BBB- or higher using the middle rating of Moody's Investors Service, Inc., Standard & Poor's, and Fitch Inc.) government bonds, investment grade corporate bonds, mortgage pass-through securities, commercial mortgage backed securities and other asset backed securities that are publicly for sale in the United States. The securities in the Index must have at least 1 year remaining to maturity and must have $300 million or more of outstanding face value. Asset backed securities must have a minimum deal size of $500 million and a minimum tranche size of $25 million. For commercial mortgage backed securities, the original aggregate transaction must have a minimum deal size of $500 million, and a minimum tranche size of $25 million; the aggregate outstanding transaction sizes must be at least $300 million to remain in the Index. In addition, the securities must be U.S. dollar denominated, fixed rate, non-convertible, and taxable. Certain types of securities, such as flower bonds, targeted investor notes, and state and local government series bonds are excluded from the Index. Also excluded from the Index are structured notes with embedded swaps or other special features, private placements and floating rate securities. The Index is market capitalization weighted and the securities in the Index are updated on the last business day of each month. It is not possible to invest directly in the Index.

The Fund expects typically to invest a significant portion of its assets in U.S. agency mortgage pass-through securities up to a total weight that is comparable to that of the Index. Most transactions in mortgage pass-through securities occur through standardized contracts for future delivery in which the exact mortgage pools to be delivered are not specified until a few days prior to settlement, referred to as a “to-be-announced transaction” or “TBA Transaction.” In a TBA Transaction, the buyer and seller agree upon general trade parameters such as agency, settlement date, par amount and price. The actual pools delivered generally are determined two days prior to the settlement date; however, it is not anticipated that the Fund will receive pools, but instead will participate in rolling TBA Transactions. The Fund expects to enter into such contracts on a regular basis.

The Fund seeks to achieve its investment objective by investing substantially all of its investable assets in the Aggregate Bond Index Portfolio, which has substantially identical investment policies to the Fund. When the Fund invests in this “master-feeder” structure, the Fund's only investments are shares of the Portfolio and it participates in the investment returns achieved by the Portfolio. Descriptions in this section of the investment activities of the “Fund” also generally describe the expected investment activities of the Portfolio.

The Index is sponsored by Bloomberg Index Services Limited (the “Index Provider”) which is not affiliated with the Fund or the Adviser. The Index Provider determines the composition of the Index, relative weightings of the securities in the Index and publishes information regarding the market value of the Index.

Principal Risks

Market Risk: The Fund's investments are subject to changes in general economic conditions, general market fluctuations and the risks inherent in investment in securities markets. Investment markets can be volatile and prices of investments can change substantially due to various factors including, but not limited to, economic growth or recession, changes in interest rates, inflation, changes in the actual or perceived creditworthiness of issuers, and general market liquidity. The Fund is subject to the risk that geopolitical events will disrupt securities markets and adversely affect global economies and markets. Local, regional or global events such as war, military conflicts, acts of terror

ism, trade policy changes or disputes, the threat or actual imposition of tariffs, natural disasters, the spread of infectious illness or other public health issues, or other events could have a significant impact on the Fund and its investments.

Debt Securities Risk: The values of debt securities may increase or decrease as a result of the following: market fluctuations, changes in interest rates, actual or perceived inability or unwillingness of issuers, guarantors or liquidity providers to make scheduled principal or interest payments, or illiquidity in debt securities markets. To the extent that interest rates rise, certain underlying obligations may be paid off substantially slower than originally anticipated and the value of those securities may fall sharply. A rising interest rate environment may cause the value of the Fund's fixed income securities to decrease, an adverse impact on the liquidity of the Fund's fixed income securities, and increased volatility of the fixed income markets. During periods when interest rates are at low levels, the Fund's yield can be low, and the Fund may have a negative yield (i.e., it may lose money on an operating basis). To the extent that interest rates fall, certain underlying obligations may be paid off substantially faster than originally anticipated. If the principal on a debt obligation is prepaid before expected, the prepayments of principal may have to be reinvested in obligations paying interest at lower rates. During periods of falling interest rates, the income received by the Fund may decline. Changes in interest rates will likely have a greater effect on the values of debt securities of longer durations. Returns on investments in debt securities could trail the returns on other investment options, including investments in equity securities. High levels of inflation and/or a significantly changing interest rate environment can lead to heightened levels of volatility and reduced liquidity.

Mortgage-Related and Other Asset-Backed Securities Risk: Investments in mortgage-related and other asset-backed securities are subject to the risk of significant credit downgrades, illiquidity, and defaults to a greater extent than many other types of fixed-income investments. The liquidity of mortgage-related and asset-backed securities may change over time. During periods of falling interest rates, mortgage- and asset-backed securities may be called or prepaid, which may result in the Fund having to reinvest proceeds in other investments at a lower interest rate. During periods of rising interest rates, the average life of mortgage- and asset-backed securities may extend, which may lock in a below-market interest rate, increase the security's duration and interest rate sensitivity, and reduce the value of the security. Enforcing rights against the underlying assets or collateral may be difficult, and the underlying assets or collateral may be insufficient if the issuer defaults.

U.S. Government Securities Risk: Certain U.S. government securities are supported by the full faith and credit of the United States; others are supported by the right of the issuer to borrow from the U.S. Treasury; others are supported by the discretionary authority of the U.S. government to purchase the agency's obligations; and still others are supported only by the credit of the issuing agency, instrumentality, or enterprise. Although U.S. government-sponsored enterprises such as the Federal Home Loan Mortgage Corporation (“Freddie Mac”) and the Federal National Mortgage Association (“Fannie Mae”) may be chartered or sponsored by Congress, they are not funded by Congressional appropriations, and their securities are not issued by the U.S. Treasury, are not supported by the full faith and credit of the U.S. government, and involve increased credit risks.

Indexing Strategy/Index Tracking Risk: The Fund is managed with an indexing investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of the Index or of the actual securities comprising the Index. This differs from an actively-managed fund, which typically seeks to outperform a benchmark index. As a result, the Fund's performance may be less favorable than that of a portfolio managed using an active investment strategy. The structure and composition of the Index will affect the performance, volatility, and risk of the Index and, consequently, the performance, volatility, and risk of the Fund. While the Adviser seeks to track the performance of the Index (i.e., achieve a high degree of correlation with the Index), the Fund's return may not match the return of the Index. The Fund incurs a number of operating expenses not applicable to the Index, and incurs costs in buying and selling securities. In addition, the Fund may not be fully invested at times, generally as a result of cash flows into or out of the Fund or reserves of cash held by the Fund to meet redemptions. The Adviser may attempt to replicate the Index return by investing in fewer than all of the securities in the Index, or in some securities not included in the Index, potentially increasing the risk of divergence between the Fund's return and that of the Index.

the Fund holds collateral posted by its counterparty, it may be delayed or prevented from realizing on the collateral in the event of a bankruptcy or insolvency proceeding relating to the counterparty.

Derivatives Risk: Derivative transactions can create investment leverage and may have significant volatility. It is possible that a derivative transaction will result in a much greater loss than the principal amount invested, that changes in the value of a derivative transaction may not correlate perfectly with the underlying asset, and that the Fund may not be able to close out a derivative transaction at a favorable time or price. The counterparty to a derivatives contract may be unable or unwilling to make timely settlement payments, return the Fund's margin, or otherwise honor its obligations. A derivatives transaction may not behave in the manner anticipated by the Adviser or may not have the effect on the Fund anticipated by the Adviser.

Income Risk: The Fund's income may decline due to falling interest rates or other factors. Issuers of securities held by the Fund may call or redeem the securities during periods of falling interest rates, and the Fund would likely be required to reinvest in securities paying lower interest rates. If an obligation held by the Fund is prepaid, the Fund may have to reinvest the prepayment in other obligations paying income at lower rates.

Large Transactions Risk: To the extent a large proportion of the shares of the Portfolio or Fund are held by a small number of shareholders (or a single shareholder), including funds or accounts over which the Adviser has investment discretion, the Fund is subject to the risk that these shareholders will purchase or redeem Portfolio or Fund shares in large amounts rapidly or unexpectedly, including as a result of an asset allocation decision made by the Adviser. In addition, a large number of shareholders collectively may purchase or redeem Portfolio or Fund shares in large amounts rapidly or unexpectedly (collectively, such transactions are referred to as “large shareholder transactions”). Large shareholder transactions could adversely affect the ability of the Portfolio or Fund to conduct its investment program.

Liquidity Risk: Lack of a ready market, stressed market conditions, or restrictions on resale may limit the ability of the Fund to sell a security at an advantageous time or price or at all. Illiquid investments may trade at a discount from comparable, more liquid investments and may be subject to wide fluctuations in market value. Illiquidity of the Fund's holdings may also limit the ability of the Fund to obtain cash to meet redemptions on a timely basis. In addition, the Fund, due to limitations on investments in any illiquid investments and/or the difficulty in purchasing and selling such investments, may be unable to achieve its desired level of exposure to a certain market or sector.

Master/Feeder Structure Risk: The Fund pursues its objective by investing substantially all of its assets in another pooled investment vehicle (a “master fund”). The ability of the Fund to meet its investment objective is directly related to the ability of the master fund to meet its investment objective. The Adviser serves as investment adviser to the master fund, leading to potential conflicts of interest. The Fund will bear its pro rata portion of the expenses incurred by the master fund. Substantial redemptions by other investors in a master fund may affect the master fund's investment program adversely and limit the ability of the master fund to achieve its objective.

Risk of Investment in Other Pools: If the Fund invests in another pooled investment vehicle, it is exposed to the risk that the other pool will not perform as expected and is exposed indirectly to all of the risks applicable to an investment in such other pool. The investment policies of the other pool may not be the same as those of the Fund; as a result, an investment in the other pool may be subject to additional or different risks than those to which the Fund is typically subject. The Fund bears its proportionate share of the fees and expenses of any pool in which it invests. The Adviser or an affiliate may serve as investment adviser to a pool in which the Fund may invest, leading to potential conflicts of interest. It is possible that other clients of the Adviser or its affiliates will purchase or sell interests in a pool sponsored or managed by the Adviser or its affiliates at prices and at times more favorable than those at which the Fund does so.

Unconstrained Sector Risk: The Fund may invest a substantial portion of its assets within one or more economic sectors or industries, which may change from time to time. Greater investment focus on one or more sectors or industries increases the potential for volatility and the risk that events negatively affecting such sectors or industries could reduce returns, potentially causing the value of the Fund's Shares to decrease, perhaps significantly.

priced using market quotations. Portfolio holdings that are valued using techniques other than market quotations, including “fair valued” securities, may be subject to greater fluctuation in their valuations from one day to the next than if market quotations were used. In addition, there is no assurance that the Fund could sell or close out a portfolio position for the value established for it at any time, and it is possible that the Fund would incur a loss because a portfolio position is sold or closed out at a discount to the valuation established by the Fund at that time. Investors who purchase or redeem Fund Shares on days when the Fund is holding fair-valued investments may receive fewer or more shares or lower or higher redemption proceeds than they would have received if the Fund had not fair-valued the holding(s) or had used a different valuation methodology.

When-Issued, TBA and Delayed Delivery Securities Risk: The Fund may purchase securities on a when-issued, to-be-announced (“TBA”) or delayed delivery basis and may purchase securities on a forward commitment basis. The purchase price of the securities is typically fixed at the time of the commitment, but delivery and payment can take place a month or more after the date of the commitment. At the time of delivery of the securities, the value may be more or less than the purchase or sale price. Purchase of securities on a when-issued, TBA, delayed delivery, or forward commitment basis may give rise to investment leverage, and may result in increased volatility of the Fund's net asset value. Default by, or bankruptcy of, a counterparty to a when-issued, TBA or delayed delivery transaction would expose the Fund to possible losses because of an adverse market action, expenses or delays in connection with the purchase or sale of the pools specified in such transaction. The Financial Industry Regulatory Authority, Inc. (“FINRA”) imposes mandatory margin requirements for certain types of when-issued, delayed delivery or forward commitment transactions (including TBA transactions), with limited exceptions. Such transactions require mandatory collateralization which may increase the cost of such transactions and impose added operational complexity.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund's returns from year-to-year and by showing how the Fund's average annual returns for the periods indicated compared with those of the Index. The bar chart shows how the Class A shares' returns have varied for each full calendar year shown. The effect of sales charges, applicable to Class A shares only, is not reflected in the bar chart; if these amounts were reflected, returns would be lower. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (800) 997-7327 or by visiting our website at www.ssga.com.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	6.58%	Q4 2023
Lowest Quarterly Return	-6.08%	Q1 2022

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Ten Years
Class A
Return Before Taxes	-2.78 %	-1.52 %	0.51 %
Return After Taxes on Distributions	-4.08 %	-2.52 %	-0.55 %
Return After Taxes on Distributions and Sale of Fund Shares	-1.65 %	-1.50 %	-0.04 %
Class I Returns Before Taxes	1.35 %	-0.49 %	1.18 %
Class K Returns Before Taxes	1.34 %	-0.33 %	1.26 %
Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)	1.25 %	-0.33 %	1.35 %

The Fund will make updated performance information, including its current net asset value, available at the Fund's website: www.ssga.com.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund and the Portfolio.

The professionals primarily responsible for the day-to-day management of the Portfolio and the Fund are Marc DiCosimo, Joanna Madden and Michael Przygoda. They have served as portfolio managers of the Fund and the Portfolio since 2014, 2016 and 2023, respectively.

Marc DiCosimo, CFA, is a Vice President of the Adviser and a Senior Portfolio Manager in the Fixed Income Beta Solutions Group. He joined the Adviser in 2013.

Joanna Madden is a Vice President of the Adviser and a Portfolio Manager in the Fixed Income Beta Solutions Group. She joined the Adviser in 2003.

Michael Przygoda, CFA, is a Vice President of the Adviser and a Portfolio Manager in the Fixed Income Beta Solutions Group. He joined the Adviser in 2006.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Class A
To establish an account	$2,000
To add to an existing account	None
Class I
To establish an account	None
To add to an existing account	None
Class K
To establish an account	None
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

Written Requests and Wire Transfers. You may purchase or redeem Fund Shares by written request or wire transfer.

Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Intermediary:

If you wish to purchase or redeem Fund Shares through a broker, bank or other financial intermediary (“Financial Intermediary”), please contact that Financial Intermediary directly. Your Financial Intermediary may have different or additional requirements for opening an account and/or for the processing of purchase and redemption orders, or may be closed at times when the Fund is open. Financial Intermediaries may contact SS&C GIDS, Inc. at (877) 332-6207 or via email at nsccresearch@dstsystems.com with questions.

Tax Information

The Fund's distributions are expected to be taxed as ordinary income and/or capital gains, unless you are investing through a tax-advantaged arrangement, such as a 401(k) plan or IRA. Any withdrawals made from such tax-advantaged arrangement may be taxable to you.

Payments to Broker-Dealers and Other Financial Intermediaries

If you purchase Fund Shares through a broker-dealer or other Financial Intermediary (such as a bank), the Adviser or its affiliates may pay the Financial Intermediary for certain activities related to the Fund, including educational training programs, conferences, the development of technology platforms and reporting systems, or other services related to the sale or promotion of the Fund. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your salesperson to recommend the Fund over another investment. Ask your salesperson or visit your Financial Intermediary's website for more information.

State Street Equity 500 Index Fund

Investment Objective

The investment objective of the State Street Equity 500 Index Fund (the “Equity 500 Index Fund” or sometimes referred to in context as the “Fund”) is to replicate as closely as possible, before expenses, the performance of the Standard & Poor's 500 Index (the “S&P 500” or sometimes referred to in context as the “Index”).

Fees and Expenses of the Fund

The tables below describe the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund (“Fund Shares”). You may pay other fees, such as brokerage commissions and other fees to financial intermediaries which are not reflected in the tables and examples below. You may qualify for sales charge discounts on purchases of Class A shares if you agree to invest in the future, or if you and your family currently invest, at least $50,000 in State Street Funds that offer Class A shares. More information about these and other discounts is available from your financial intermediary (“Financial Intermediary”) and in Choosing a Share Class – Reducing Your Class A Sales Charge on page 63 of the Fund's Prospectus. The expenses shown in the table and the Example reflect the expenses of both the Fund and the Fund's proportionate share of the expenses of State Street Equity 500 Index II Portfolio (the “Equity 500 Index II Portfolio” or sometimes referred to in context as the “Portfolio”).

Shareholder Fees (fees paid directly from your investment)

	Class A	Class I	Class K
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	5.25%	None	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None1	None	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

	Class A	Class I	Class K
Management Fee	0.02%	0.02%	0.02%
Distribution and/or Shareholder Service (12b-1) Fees	0.25%	0.00%	0.00%
Other Expenses2	0.28%	0.28%	0.08%
Total Annual Fund Operating Expenses	0.55%	0.30%	0.10%
Less Fee Waivers and/or Expense Reimbursements3	(0.08%)	(0.08%)	(0.08%)
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	0.47%	0.22%	0.02%

Other Expenses have been restated to reflect current fees.

The Fund's investment adviser, SSGA Funds Management, Inc. (the “Adviser” or “SSGA FM”), is contractually obligated until April 30, 2026, separately with respect to each of the Fund and the Portfolio, (i) to waive up to the full amount of the advisory fee payable by the Fund or the Portfolio, and/or (ii) to reimburse the Fund or the Portfolio to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, extraordinary expenses, and distribution, shareholder servicing, and sub-transfer agency fees) exceed 0.02% of the Fund's or the Portfolio's average daily net assets on an annual basis (for avoidance of doubt, the waiver and/or reimbursement is inclusive of all the allocation of expenses from the Portfolio). This waiver and/or reimbursement may not be terminated prior to April 30, 2026 except with approval of the Fund's/Portfolio's Board of Trustees.

Example:

	1 year	3 years	5 years	10 years
Class A	$571	$684	$809	$1,171
Class I	$23	$88	$161	$373
Class K	$2	$24	$48	$120

Portfolio Turnover:

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). As a shareholder of the Equity 500 Index II Portfolio, the Fund bears its ratable share of the transaction costs associated with the portfolio turnover of the Portfolio. A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund Shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 4% of the average value of its portfolio.

Principal Investment Strategies

The Fund uses a passive management strategy designed to track the performance of the S&P 500. The Index is a well-known stock market index that includes common stocks of 500 companies from a number of sectors and that measures the performance of the large-cap sector of the U.S. equities market. As of February 28, 2025, a significant portion of the Index comprised companies in the information technology, healthcare and financials sectors, although this may change from time to time.

The Fund is not managed according to traditional methods of “active” investment management, which involve the buying and selling of securities based upon economic, financial and market analysis and investment judgment. Instead, the Fund, using a “passive” or “indexing” investment approach, seeks to provide investment results that, before expenses, correspond generally to the total return of the S&P 500.

The Fund generally intends to invest in all stocks comprising the S&P 500 in approximate proportion to their weightings in the Index. However, under various circumstances, it may not be possible or practicable to purchase all stocks in those weightings. In those circumstances, the Fund may purchase a sample of the stocks in the Index in proportions expected by SSGA Funds Management, Inc. (“SSGA FM” or the “Adviser”), the investment adviser to the Fund, to match generally the performance of the Index as a whole. In addition, from time to time, stocks are added to or removed from the Index. The Fund may sell securities that are represented in the Index, or purchase securities that are not yet represented in the Index, in anticipation of their removal from or addition to the Index. Under normal market conditions, the Fund will not invest less than 80% of its total assets in stocks in the Index. Shareholders will receive sixty (60) days' notice prior to a change in the 80% investment policy. For this purpose, “total assets” means net assets plus borrowings, if any. The notional value of the Fund's investments in derivatives or other synthetic instruments that provide exposures comparable, in the judgment of the Adviser, to investments in the Index may be counted toward satisfaction of this 80% policy. In addition, the Fund may invest in equity securities that are not included in the Index, cash and cash equivalents or money market instruments, such as repurchase agreements and money market funds (including money market funds advised by the Adviser).

not yet been completed. The Fund may also enter into other derivatives transactions, including the use of options or swap transactions, in lieu of investing directly in the stocks making up the Index. The Fund may also, to the extent permitted by applicable law, invest in shares of other mutual funds whose investment objectives and policies are similar to those of the Fund (including funds advised by the Adviser).

The Fund seeks to achieve its investment objective by investing substantially all of its investable assets in the Equity 500 Index II Portfolio, which has substantially similar investment policies to the Fund. When the Fund invests in this “master-feeder” structure, the Fund's only investments are shares of the Portfolio, and it participates in the investment returns achieved by the Portfolio. Descriptions in this section of the investment activities of the “Fund” also generally describe the expected investment activities of the Portfolio.

Principal Risks

Equity Investing Risk: The market prices of equity securities owned by the Fund may go up or down, sometimes rapidly or unpredictably. The value of a security may decline for a number of reasons that may directly relate to the issuer and also may decline due to general industry or market conditions that are not specifically related to a particular company. In addition, equity markets tend to move in cycles, which may cause stock prices to fall over short or extended periods of time.

Information Technology Sector Risk: Market or economic factors impacting information technology companies could have a major effect on the value of the Fund's investments. The value of stocks of information technology companies is particularly vulnerable to rapid changes in technology product cycles, rapid product obsolescence, government regulation and competition, both domestically and internationally, including competition from foreign competitors with lower production costs. Like other technology companies, information technology companies may have limited product lines, markets, financial resources or personnel. Stocks of technology companies and companies that rely heavily on technology, especially those of smaller, less-seasoned companies, tend to be more volatile than the overall market. Information technology companies are heavily dependent on patent and intellectual property rights, the loss or impairment of which may adversely affect profitability. Additionally, companies in the information technology sector may face dramatic and often unpredictable changes in growth rates and competition for the services of qualified personnel.

performance, volatility, and risk of the Index and, consequently, the performance, volatility, and risk of the Fund. While the Adviser seeks to track the performance of the Index (i.e., achieve a high degree of correlation with the Index), the Fund's return may not match the return of the Index. The Fund incurs a number of operating expenses not applicable to the Index, and incurs costs in buying and selling securities. In addition, the Fund may not be fully invested at times, generally as a result of cash flows into or out of the Fund or reserves of cash held by the Fund to meet redemptions. The Adviser may attempt to replicate the Index return by investing in fewer than all of the securities in the Index, or in some securities not included in the Index, potentially increasing the risk of divergence between the Fund's return and that of the Index.

Counterparty Risk: The Fund will be subject to credit risk with respect to the counterparties with which the Fund enters into derivatives contracts, repurchase agreements, reverse repurchase agreements, and other transactions. If a counterparty fails to meet its contractual obligations, the Fund may be unable to terminate or realize any gain on the investment or transaction, or to recover collateral posted to the counterparty, resulting in a loss to the Fund. If the Fund holds collateral posted by its counterparty, it may be delayed or prevented from realizing on the collateral in the event of a bankruptcy or insolvency proceeding relating to the counterparty.

Financial Sector Risk: Financial services companies are subject to extensive governmental regulation, which may limit both the amounts and types of loans and other financial commitments they can make, the interest rates and fees they can charge, the scope of their activities, the prices they can charge and the amount of capital they must maintain. Profitability is largely dependent on the availability and cost of capital funds and can fluctuate significantly when interest rates change or due to increased competition. In addition, deterioration of the credit markets generally may cause an adverse impact in a broad range of markets, including U.S. and international credit and interbank money markets generally, thereby affecting a wide range of financial institutions and markets. Certain events in the financial sector may cause an unusually high degree of volatility in the financial markets, both domestic and foreign, and cause certain financial services companies to incur large losses. Securities of financial services companies may experience a dramatic decline in value when such companies experience substantial declines in the valuations of their assets, take action to raise capital (such as the issuance of debt or equity securities), or cease operations. Credit losses resulting from financial difficulties of borrowers and financial losses associated with investment activities can negatively impact the sector. Insurance companies may be subject to severe price competition. Adverse economic, business or political developments could adversely affect financial institutions engaged in mortgage finance or other lending or investing activities directly or indirectly connected to the value of real estate.

Healthcare Sector Risk: Companies in the healthcare sector are subject to extensive government regulation and their profitability can be significantly affected by restrictions on government reimbursement for medical expenses, rising costs of medical products and services, pricing pressure (including price discounting), limited product lines and an increased emphasis on the delivery of healthcare through outpatient services. Companies in the healthcare sector are heavily dependent on obtaining and defending patents, which may be time consuming and costly, and the expiration of patents may also adversely affect the profitability of these companies. Healthcare companies are also subject to extensive litigation based on product liability and similar claims. In addition, their products can become obsolete due to industry innovation, changes in technologies or other market developments. Many new products in the healthcare sector require significant research and development and may be subject to regulatory approvals, all of which may be time consuming and costly with no guarantee that any product will come to market.

Large-Capitalization Securities Risk: Returns on investments in securities of large companies could trail the returns on investments in securities of smaller and mid-sized companies. Larger companies may be unable to respond as quickly as smaller and mid-sized companies to competitive challenges or to changes in business, product, financial, or other market conditions. Larger companies may not be able to maintain growth at the high rates that may be achieved by well-managed smaller and mid-sized companies.

Performance

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	20.40%	Q2 2020
Lowest Quarterly Return	-19.68%	Q1 2020

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Ten Years
Class A
Return Before Taxes	17.91 %	12.72 %	11.92 %
Return After Taxes on Distributions	17.56 %	12.29 %	11.22 %
Return After Taxes on Distributions and Sale of Fund Shares	10.81 %	10.09 %	9.65 %
Class I Returns Before Taxes	24.89 %	14.25 %	12.83 %
Class K Returns Before Taxes	24.99 %	14.45 %	13.01 %
S&P 500 Index (reflects no deduction for fees, expenses or taxes)	25.02 %	14.53 %	13.10 %

The Fund will make updated performance information, including its current net asset value, available at the Fund's website: www.ssga.com.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund and the Portfolio.

The professionals primarily responsible for the day-to-day management of the Portfolio and the Fund are Karl Schneider and Amy Scofield. Karl Schneider has served on the Fund and the Portfolio/the prior master portfolio in which the Fund has invested since 2002. Amy Scofield has served on the Fund and the Portfolio/the prior master portfolio in which the Fund has invested since 2012.

Karl Schneider, CAIA, is a Managing Director of the Adviser and Co-Head of the Systematic Equity Group in the Americas. He joined the Adviser in 1997.

Amy Scofield is a Vice President of the Adviser and a Portfolio Manager in the Systematic Equity Group. She joined the Adviser in 2010.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Class A
To establish an account	$2,000
To add to an existing account	None
Class I
To establish an account	None
To add to an existing account	None
Class K
To establish an account	None
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

Written Requests and Wire Transfers. You may purchase or redeem Fund Shares by written request or wire transfer.

Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Intermediary:

Tax Information

The Fund's distributions are expected to be taxed as ordinary income, qualified dividend income and/or capital gains, unless you are investing through a tax-advantaged arrangement, such as a 401(k) plan or IRA. Any withdrawals made from such tax-advantaged arrangement may be taxable to you.

Payments to Broker-Dealers and Other Financial Intermediaries

State Street Global All Cap Equity ex-U.S. Index Fund

Investment Objective

The State Street Global All Cap Equity ex-U.S. Index Fund (the “Global All Cap Equity ex-U.S. Index Fund” or the “Fund”) seeks to provide investment results that, before fees and expenses, correspond generally to the total return performance of a broad-based index of world (ex-U.S.) equity markets over the long term.

Fees and Expenses of the Fund

The tables below describe the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund (“Fund Shares”). You may pay other fees, such as brokerage commissions and other fees to financial intermediaries which are not reflected in the tables and examples below. You may qualify for sales charge discounts on purchases of Class A shares if you agree to invest in the future, or if you and your family currently invest, at least $50,000 in State Street Funds that offer Class A shares. More information about these and other discounts is available from your financial intermediary (“Financial Intermediary”) and in Choosing a Share Class – Reducing Your Class A Sales Charge on page 63 of the Fund's Prospectus. The expenses shown in the table and the Example reflect the expenses of both the Fund and the Fund's proportionate share of the expenses of State Street Global All Cap Equity ex-U.S. Index Portfolio (the “Global All Cap Equity ex-U.S. Index Portfolio” or sometimes referred to in context as the “Portfolio”).

Shareholder Fees (fees paid directly from your investment)

	Class A	Class I	Class K
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	5.25%	None	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None1	None	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

	Class A	Class I	Class K
Management Fee	0.060%	0.060%	0.060%
Distribution and/or Shareholder Service (12b-1) Fees	0.250%	0.000%	0.000%
Other Expenses2	0.378%	0.378%	0.178%
Total Annual Fund Operating Expenses	0.688%	0.438%	0.238%
Less Fee Waivers and/or Expense Reimbursements3	(0.173%)	(0.173%)	(0.173%)
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	0.515%	0.265%	0.065%

Other Expenses have been restated to reflect current fees.

The Fund's investment adviser, SSGA Funds Management, Inc. (the “Adviser” or “SSGA FM”), is contractually obligated until April 30, 2026, separately with respect to each of the Fund and the Portfolio, (i) to waive up to the full amount of the advisory fee payable by the Fund or the Portfolio, and/or (ii) to reimburse the Fund/Portfolio to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, extraordinary expenses; with respect to the Fund, acquired fund fees and expenses, any class-specific expenses, such as distribution, shareholder servicing, sub-transfer agency and administration fees; and, with respect to the Portfolio, distribution, shareholder servicing and sub-transfer agency fees) exceed 0.015% of the Fund's and 0.08% of the Portfolio's average daily net assets on an annual basis (for avoidance of doubt, the waiver and/or reimbursement is inclusive of the allocation of expenses from the Portfolio). This waiver and/or reimbursement may not be terminated prior to April 30, 2026 except with approval of the Fund's/Portfolio's Board of Trustees.

Example:

	1 year	3 years	5 years	10 years
Class A	$575	$717	$872	$1,321
Class I	$27	$123	$228	$535
Class K	$7	$59	$116	$286

Portfolio Turnover:

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). As a shareholder of the Global All Cap Equity ex-U.S. Index Portfolio, the Fund bears its ratable share of the transaction costs associated with the portfolio turnover of the Portfolio. A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund Shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 1% of the average value of its portfolio.

Principal Investment Strategies

The Fund is an “index” fund that seeks to track, before fees and expenses, the total return performance of the MSCI ACWI ex USA Investable Market Index (the “MSCI ACWI ex USA IMI Index” or sometimes referred to in context as the “Index”) over the long term. As an “index” fund, the Fund is not managed according to traditional methods of “active” investment management, which involve the buying and selling of securities based upon economic, financial and market analysis and investment judgment. As of February 28, 2025, a significant portion of the Index comprised companies in the financials, industrials and information technology sectors, although this may change from time to time. As of February 28, 2025, a significant portion of the Index comprised companies located in Japan and the United Kingdom and a significant portion of the Index constituents are denominated in the Euro and Yen, although this may change from time to time.

Under normal circumstances, the Fund generally invests substantially all, but at least 80%, of its net assets (plus borrowings, if any) in securities comprising the Index or in American Depositary Receipts (“ADRs”) or Global Depositary Receipts (“GDRs”) providing exposure to securities comprising the Index. The notional value of the Fund's investments in derivatives or other synthetic instruments that provide exposures comparable, in the judgment of the Adviser, to investments in the Index may be counted toward satisfaction of this 80% policy. The Fund will provide shareholders with at least sixty (60) days' notice prior to any change in this 80% investment policy. In addition, the Fund may invest in equity securities that are not included in the Index, cash and cash equivalents or money market instruments, such as repurchase agreements and money market funds (including money market funds advised by the Adviser).

been completed. The Fund may also enter into other derivatives transactions, including the use of options, forwards or swap transactions, in lieu of investing directly in the stocks making up the Index. The Fund may also, to the extent permitted by applicable law, invest in shares of other mutual funds whose investment objectives and policies are similar to those of the Fund (including funds advised by the Adviser).

The Index is a free float-adjusted market capitalization index that is designed to measure the combined equity market performance of securities, across all market capitalizations, in developed and emerging market countries excluding the United States. All listed equity securities and listed securities that exhibit characteristics of equity securities, except mutual funds, ETFs, equity derivatives, limited partnerships and most investment trusts, are eligible for inclusion. Countries covered in the Index have historically included, among others, Australia, Austria, Belgium, Brazil, Canada, Chile, China, Colombia, Czech Republic, Denmark, Egypt, Finland, France, Germany, Greece, Hong Kong, Hungary, India, Indonesia, Ireland, Israel, Italy, Japan, Korea, Kuwait, Malaysia, Mexico, the Netherlands, New Zealand, Norway, Peru, Philippines, Poland, Portugal, Qatar, Saudi Arabia, Singapore, South Africa, Spain, Sweden, Switzerland, Taiwan, Thailand, Turkey, United Arab Emirates and the United Kingdom. It is not possible to invest directly in the Index.

The Fund seeks to achieve its investment objective by investing substantially all of its investable assets in the Global All Cap Equity ex-U.S. Index Portfolio, which has substantially identical investment policies to the Fund. When the Fund invests in this “master-feeder” structure, the Fund's only investments are shares of the Portfolio and it participates in the investment returns achieved by the Portfolio. Descriptions in this section of the investment activities of the “Fund” also generally describe the expected investment activities of the Portfolio.

The Index is sponsored by MSCI Inc. (the “Index Provider”), which is not affiliated with the Fund or the Adviser. The Index Provider determines the composition of the Index, relative weightings of the securities in the Index and publishes information regarding the market value of the Index.

Principal Risks

financial report standards comparable to those in the United States. Further, such entities and/or their securities may be subject to risks associated with currency controls; expropriation; changes in tax policy; greater market volatility; differing securities market structures; higher transaction costs; and various administrative difficulties, such as delays in clearing and settling portfolio transactions or in receiving payment of dividends. Securities traded on foreign markets may be less liquid (harder to sell) than securities traded domestically. Foreign governments may impose restrictions on the repatriation of capital to the U.S. In addition, to the extent that the Fund buys securities denominated in a foreign currency, there are special risks such as changes in currency exchange rates and the risk that a foreign government could regulate foreign exchange transactions. In addition, to the extent investments are made in a limited number of countries, events in those countries will have a more significant impact on the Fund. Investments in depositary receipts may be less liquid and more volatile than the underlying shares in their primary trading market.

Geographic Focus Risk: The performance of a fund that invests significantly in one or more countries or geographic regions will be closely tied to market, currency, economic, political, environmental, or regulatory conditions and developments in the countries or regions in which the fund invests, and may be more volatile than the performance of a fund that does not invest significantly in such countries or regions.

China: The Chinese economy is generally considered an emerging market and can be significantly affected by economic and political conditions and policy in China and surrounding Asian countries. A relatively small number of Chinese companies represent a large portion of China's total market and thus may be more sensitive to adverse political or economic circumstances and market movements. The economy of China differs, often unfavorably, from the U.S. economy in such respects as structure, general development, government involvement, wealth distribution, rate of inflation, growth rate, allocation of resources and capital reinvestment, among others. Under China's political and economic system, the central government has historically exercised substantial control over virtually every sector of the Chinese economy through administrative regulation and/or state ownership. The Chinese government may intervene or seek to control the operations, structure, or ownership of Chinese companies, including with respect to foreign investors of such companies. In addition, expropriation, including nationalization, confiscatory taxation, political, economic or social instability or other developments could adversely affect and significantly diminish the values of the Chinese companies in which the Fund invests. The Chinese economy and financial markets have experienced high levels of growth in recent years; any actual or perceived reduction or curtailment in those levels of growth in the future would likely have a substantial adverse impact on the values of Chinese companies. These factors and others could negatively affect the value and liquidity of the Fund. The Fund may invest in shares of Chinese companies traded on stock markets in Mainland China or Hong Kong. These stock markets have recently experienced high levels of volatility, which may continue in the future. The Hong Kong stock market may behave differently from the Mainland China stock market and there may be little to no correlation between the performance of the Hong Kong stock market and the Mainland China stock market. The Fund may gain investment exposure to Chinese companies through variable interest entity (“VIE”) structures. The VIE structure enables foreign investors, such as the Fund, to obtain investment exposure to a Chinese company in situations in which the Chinese government has limited or prohibited non-Chinese ownership of such company. The VIE structure does not involve equity ownership in a China-based company but rather involves claims to the China-based company's profits and control of its assets through contractual arrangements. In addition to the risk of government intervention, investments through a VIE structure are subject to the risk that the China-based company (or its officers, directors, or Chinese equity owners) may breach those contractual arrangements, or Chinese law changes in a way that adversely affects the enforceability of these arrangements, or those contracts are otherwise not enforceable under Chinese law, in which case the Fund may suffer significant losses on its investments through a VIE structure with little or no recourse available. If the Chinese government takes action adversely affecting VIE structures, the market value of the Fund's associated portfolio holdings would likely suffer significant, detrimental, and possibly permanent consequences, which could result in substantial investment losses.

laws that were assimilated into UK law from January 1, 2021, and replacing them with legislation or rules made by the UK government or financial services regulators. Accordingly, uncertainty remains in certain areas as to the future relationship between the UK and the EU. Brexit has already had a significant impact on the UK, Europe, and global economies, and could continue to result in volatility and illiquidity, legal, political, economic and regulatory uncertainties and lower economic growth for these economies that could in turn have an adverse effect on the value of the Fund's investments. Any further exits from the EU, or the possibility of such exits, or the abandonment of the euro, may cause additional market disruption globally and introduce new legal and regulatory uncertainties. In addition, a number of countries in Europe have suffered terrorist attacks and additional attacks may occur in the future. Such attacks may cause uncertainty in financial markets and may adversely affect the performance of the issuers to which the Fund has exposure.

Japan: The growth of Japan's economy has historically lagged that of its Asian neighbors and other major developed economies. The Japanese economy is heavily dependent on international trade and has been adversely affected by trade tariffs, other protectionist measures, competition from emerging economies and the economic conditions of its trading partners. China has become an important trading partner with Japan, yet the countries' political relationship has become strained. Should political tension increase, it could adversely affect the economy, especially the export sector, and destabilize the region as a whole. Japan also remains heavily dependent on oil imports, and higher commodity prices could therefore have a negative impact on the economy. The Japanese yen has fluctuated widely at times and any increase in its value may cause a decline in exports that could weaken the Japanese economy. Japan has, in the past, intervened in the currency markets to attempt to maintain or reduce the value of the yen. Japanese intervention in the currency markets could cause the value of the yen to fluctuate sharply and unpredictably and could cause losses to investors. Japan has an aging workforce and has experienced a significant population decline in recent years. Japan's labor market appears to be undergoing fundamental structural changes, as a labor market traditionally accustomed to lifetime employment adjusts to meet the need for increased labor mobility, which may adversely affect Japan's economic competitiveness. Natural disasters, such as earthquakes, volcanoes, typhoons or tsunamis, could occur in Japan or surrounding areas and could negatively affect the Japanese economy and, in turn, the Fund.

United Kingdom: The United Kingdom has one of the largest economies in Europe, and the United States and other European countries are substantial trading partners of the United Kingdom. As a result, the British economy may be impacted by changes to the economic condition of the United States and other European countries. The British economy relies heavily on the export of financial services to the United States and other European countries and, therefore, a prolonged slowdown in the financial services sector may have a negative impact on the British economy. Continued governmental involvement or control in certain sectors may stifle competition in certain sectors or cause adverse effects on economic growth. In the past, the UK has been a target of terrorism. Acts of terrorism in the UK or against British interests abroad may cause uncertainty in the British financial markets and adversely affect the performance of the issuers to which the Fund has exposure.

Currency Risk: The value of the Fund's assets may be affected favorably or unfavorably by currency exchange rates, currency exchange control regulations, and delays, restrictions or prohibitions on the repatriation of foreign currencies. Foreign currency exchange rates may have significant volatility, and changes in the values of foreign currencies against the U.S. dollar may result in substantial declines in the values of the Fund's assets denominated in foreign currencies.

Depositary Receipts Risk: Investments in depositary receipts may be less liquid and more volatile than the underlying securities in their primary trading market. If a depositary receipt is denominated in a different currency than its underlying securities, the Fund will be subject to the currency risk of both the investment in the depositary receipt and the underlying security. Holders of depositary receipts may have limited or no rights to take action with respect to the underlying securities or to compel the issuer of the receipts to take action. The prices of depositary receipts may differ from the prices of securities upon which they are based. To the extent the Fund invests in depositary receipts based on securities included in the Index, such differences in prices may increase index tracking risk.

Emerging Markets Risk: Risks of investing in emerging markets include, among others, greater political and economic instability, greater volatility in currency exchange rates, less developed securities markets, increased potential for market manipulation, possible trade barriers, currency transfer restrictions, a more limited number of potential buyers and issuers, an emerging market country's dependence on revenue from particular commodities or international aid, less governmental supervision and regulation, unavailability of currency hedging techniques, differences in auditing and financial reporting standards, less stringent investor protection and disclosure standards, less developed public health systems, and less developed legal systems. There is also the potential for unfavorable action such as expropriation, nationalization, embargoes, and acts of war. The securities of emerging market companies may trade less frequently and in smaller volumes than more widely held securities. Market disruptions or substantial market corrections may limit very significantly the liquidity of securities of certain companies in a particular country or geographic region, or of all companies in the country or region. The Fund may be unable to liquidate its positions in such securities at any time, or at a favorable price, in order to meet the Fund's obligations. These risks are generally greater for investments in frontier market countries, which typically have smaller economies or less developed capital markets than traditional emerging market countries.

civil liabilities will likewise affect the performance of these companies. Aerospace and defense companies, a component of the industrial sector, can be significantly affected by government spending policies because companies involved in this industry rely, to a significant extent, on U.S. and foreign government demand for their products and services. Thus, the financial condition of, and investor interest in, aerospace and defense companies are heavily influenced by governmental defense spending policies which are typically under pressure from efforts to control the U.S. (and other) government budgets. Transportation securities, another component of the industrial sector, are cyclical and have occasional sharp price movements which may result from changes in the economy, fuel prices, labor agreements and insurance costs.

to potential conflicts of interest. It is possible that other clients of the Adviser or its affiliates will purchase or sell interests in a pool sponsored or managed by the Adviser or its affiliates at prices and at times more favorable than those at which the Fund does so.

Small-, Mid-, and Micro-Capitalization Securities Risk: The securities of small-, mid- and micro-capitalization companies may be more volatile and may involve more risk than the securities of larger companies. These companies may have limited product lines, markets or financial resources, may lack the competitive strength of larger companies, and may depend on a few key employees. In addition, these companies may have been recently organized and may have little or no track record of success. The securities of smaller companies may trade less frequently and in smaller volumes than more widely held securities. Some securities of smaller issuers may be illiquid or may be restricted as to resale, and their values may have significant volatility. The Fund may be unable to liquidate its positions in such securities at any time, or at a favorable price, in order to meet the Fund's obligations. Returns on investments in securities of small-, mid- and micro-capitalization companies could trail the returns on investments in securities of larger companies.

Special Risk Considerations of Investing in China: Investing in securities of Chinese issuers, including by investing in A Shares, involves certain risks and considerations not typically associated with investing in securities of U.S. issuers, including, among others, more frequent trading suspensions and government interventions (including by nationalization of assets or U.S. or foreign government interventions or restrictions that could preclude the Fund from making certain investments or result in the Fund selling investments at disadvantageous times), currency exchange rate fluctuations or blockages, limits on the use of brokers and on foreign ownership, different financial reporting standards, higher dependence on exports and international trade, potential for increased trade tariffs, sanctions, embargoes and other trade limitations, and custody risks associated with programs used to access Chinese securities. Significant portions of the Chinese securities markets may become rapidly illiquid, as Chinese issuers have the ability to suspend the trading of their equity securities, and have shown a willingness to exercise that option in response to market volatility and other events.

Valuation Risk: Certain portfolio holdings may be valued on the basis of factors other than market quotations. This may occur more often in times of market turmoil or reduced liquidity. There are multiple methods that can be used to value a portfolio holding when market quotations are not readily available. The value established for any portfolio holding at a point in time might differ from what would be produced using a different methodology or if it had been priced using market quotations. Portfolio holdings that are valued using techniques other than market quotations, including “fair valued” securities, may be subject to greater fluctuation in their valuations from one day to the next than if market quotations were used. In addition, there is no assurance that the Fund could sell or close out a portfolio position for the value established for it at any time, and it is possible that the Fund would incur a loss because a portfolio position is sold or closed out at a discount to the valuation established by the Fund at that time. Investors who purchase or redeem Fund Shares on days when the Fund is holding fair-valued investments may receive fewer or more shares or lower or higher redemption proceeds than they would have received if the Fund had not fair-valued the holding(s) or had used a different valuation methodology.

Performance

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	18.22%	Q2 2020
Lowest Quarterly Return	-24.87%	Q1 2020

Average Annual Total Returns (for periods ended 12/31/24)

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. After-tax returns depend on an investor's tax situation and may differ from those shown, and after-tax returns are not relevant to investors who hold their shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”). Effective October 9, 2019 (the “Benchmark Index Change Date”), the Fund's benchmark index changed from the MSCI ACWI ex USA Index (the “Previous Benchmark Index”) to the MSCI ACWI ex USA Investable Market Index, consistent with a change in the Fund's principal investment strategy to track the performance of the current index. Performance of the Fund prior to the Benchmark Index Change Date is therefore based on the Fund's investment strategy to track the Previous Benchmark Index. After tax returns are shown only for Class A and after tax returns will vary for other share classes. Except for differences in returns resulting from differences in fees, expenses, and sales charges (as applicable), all share classes would have substantially similar returns because all share classes invest in the same portfolio of securities.

	One Year	Five Years	Ten Years
Class A
Return Before Taxes	-0.96 %	2.48 %	3.84 %
Return After Taxes on Distributions	-1.90 %	1.85 %	3.09 %
Return After Taxes on Distributions and Sale of Fund Shares	0.05 %	1.92 %	2.96 %
Class I Returns Before Taxes	4.92 %	3.96 %	4.71 %
Class K Returns Before Taxes	4.98 %	4.08 %	4.82 %
MSCI ACWI ex USA Investable Market Index/MSCI ACWI ex USA Index1 (reflects no deduction for fees, expenses or taxes other than withholding taxes on reinvested dividends)	5.23 %	4.12 %	4.83 %

Returns shown are reflective of the Index for periods beginning on the Benchmark Index Change Date and the Previous Benchmark Index for periods prior to the Benchmark Index Change Date.

The Fund will make updated performance information, including its current net asset value, available at the Fund's website: www.ssga.com.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund and the Portfolio.

The professionals primarily responsible for the day-to-day management of the Portfolio and the Fund are Karl Schneider and Olga Winner. They have served on the Fund and the Portfolio since inception in 2014.

Karl Schneider, CAIA, is a Managing Director of the Adviser and Co-Head of the Systematic Equity Group in the Americas. He joined the Adviser in 1997.

Olga Winner, CFA, is a Vice President of the Adviser and a Senior Portfolio Manager in the Systematic Equity Group. She joined the Adviser in 2007.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Class A
To establish an account	$2,000
To add to an existing account	None
Class I
To establish an account	None
To add to an existing account	None
Class K
To establish an account	None
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

Written Requests and Wire Transfers. You may purchase or redeem Fund Shares by written request or wire transfer.

Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Intermediary:

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

State Street Small/Mid Cap Equity Index Fund

Investment Objective

The State Street Small/Mid Cap Equity Index Fund (the “Small/Mid Cap Equity Index Fund” or the “Fund”) seeks to provide investment results that, before expenses, correspond generally to the total return of an index that tracks the performance of mid-to small- capitalization exchange traded U.S. equity securities.

Fees and Expenses of the Fund

The tables below describe the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund (“Fund Shares”). You may pay other fees, such as brokerage commissions and other fees to financial intermediaries which are not reflected in the tables and examples below. You may qualify for sales charge discounts on purchases of Class A shares if you agree to invest in the future, or if you and your family currently invest, at least $50,000 in State Street Funds that offer Class A shares. More information about these and other discounts is available from your financial intermediary (“Financial Intermediary”) and in Choosing a Share Class – Reducing Your Class A Sales Charge on page 63 of the Fund's Prospectus. The expenses shown in the table and the Example reflect the expenses of both the Fund and the Fund's proportionate share of the expenses of State Street Small/Mid Cap Equity Index Portfolio (the “Small/Mid Cap Equity Index Portfolio” or sometimes referred to in context as the “Portfolio”).

Shareholder Fees (fees paid directly from your investment)

	Class A	Class I	Class K
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	5.25%	None	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None1	None	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

	Class A	Class I	Class K
Management Fee	0.030%	0.030%	0.030%
Distribution and/or Shareholder Service (12b-1) Fees	0.250%	0.000%	0.000%
Other Expenses2	0.310%	0.310%	0.110%
Total Annual Fund Operating Expenses	0.590%	0.340%	0.140%
Less Fee Waivers and/or Expense Reimbursements3	(0.095%)	(0.095%)	(0.095%)
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	0.495%	0.245%	0.045%

Other Expenses have been restated to reflect current fees.

The Fund's investment adviser, SSGA Funds Management, Inc. (the “Adviser” or “SSGA FM”), is contractually obligated until April 30, 2026, separately with respect to each of the Fund and the Portfolio, (i) to waive up to the full amount of the advisory fee payable by the Fund or the Portfolio, and/or (ii) to reimburse the Fund or the Portfolio to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, extraordinary expenses, and distribution, shareholder servicing, and sub-transfer agency fees) exceed 0.045% of the Fund's and 0.03% of the Portfolio's average daily net assets on an annual basis (for avoidance of doubt, the waiver and/or reimbursement is inclusive of the allocation of expenses from the Portfolio). This waiver and/or reimbursement may not be terminated prior to April 30, 2026 except with approval of the Fund's/Portfolio's Board of Trustees.

Example:

	1 year	3 years	5 years	10 years
Class A	$573	$695	$828	$1,216
Class I	$25	$100	$181	$421
Class K	$5	$35	$69	$170

Portfolio Turnover:

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). As a shareholder of the Small/Mid Cap Equity Index Portfolio, the Fund bears its ratable share of the transaction costs associated with the portfolio turnover of the Portfolio. A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund Shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 24% of the average value of its portfolio.

Principal Investment Strategies

The Fund uses a passive management strategy designed to track the performance of the Russell Small Cap Completeness Index (the “Index”). The Index is a float-adjusted, market capitalization index which measures the performance of the Russell 3000® Index companies excluding S&P 500® constituents. The Index is constructed to provide a comprehensive and unbiased barometer of the extended broad market beyond the S&P 500 exposure. The Index is completely reconstituted annually to ensure new and growing equities are included. As of February 28, 2025, the market capitalization of the companies included in the Index ranged from $1.21 million to $122.09 billion. As of February 28, 2025, the Index comprised 2,457 securities. As of February 28, 2025, a significant portion of the Index comprised companies in the information technology, healthcare, industrials, financials and consumer discretionary sectors, although this may change from time to time.

The Fund generally intends to invest in all stocks comprising the Index in approximate proportion to their weightings in the Index. However, under various circumstances, it may not be possible or practicable to purchase all stocks in those weightings. In those circumstances, the Fund may purchase a sample of the stocks in the Index in proportions expected by SSGA Funds Management, Inc. (“SSGA FM” or the “Adviser”), the investment adviser to the Fund, to match generally the performance of the Index as a whole. In addition, from time to time, stocks are added to or removed from the Index. The Fund may sell securities that are represented in the Index, or purchase securities that are not yet represented in the Index, in anticipation of their removal from or addition to the Index. Under normal market conditions, the Fund invests at least 80% of its net assets (plus borrowings, if any) in stocks in the Index. The Fund will provide shareholders with at least sixty (60) days' notice prior to any change in this 80% investment policy. The notional value of the Fund's investments in derivatives or other synthetic instruments that provide exposures comparable, in the judgment of the Adviser, to investments in the Index may be counted toward satisfaction of this 80% policy. In addition, the Fund may invest in equity securities that are not included in the Index, cash and cash equivalents or money market instruments, such as repurchase agreements and money market funds (including money market funds advised by the Adviser).

The Fund may purchase or sell futures contracts on the Index, or options on those futures, in lieu of investing directly in the stocks making up the Index. The Fund might do so, for example, in order to increase its investment exposure pending investment of cash in the stocks comprising the Index. Alternatively, the Fund might use futures or options on futures to reduce its investment exposure in situations where it intends to sell a portion of the stocks in its portfolio but the sale has not yet been completed. The Fund may also enter into other derivatives transactions, including the use of options or swap transactions relating to the Index or any securities comprising the Index, in lieu of investing directly in the stocks making up the Index. The Fund may, to the extent permitted by applicable law, invest in shares of other mutual funds whose investment objectives and policies are similar to those of the Fund (including funds advised by the Adviser).

The Fund seeks to achieve its investment objective by investing substantially all of its investable assets in the State Street Small/Mid Cap Equity Index Portfolio, a separate series of the State Street Institutional Investment Trust, with an identical investment objective as the Fund and that has substantially identical investment policies, strategies and risks, to the Fund. When the Fund invests in this “master-feeder” structure, the Fund's only investments are shares of the Portfolio and it participates in the investment returns achieved by the Portfolio.

The Index is sponsored by FTSE Russell (the “Index Provider”), which is not affiliated with the Fund or the Adviser. The Index Provider determines the composition of the Index, relative weightings of the securities in the Index and publishes information regarding the market value of the Index.

Principal Risks

tions in such securities at any time, or at a favorable price, in order to meet the Fund's obligations. Returns on investments in securities of small-, mid- and micro-capitalization companies could trail the returns on investments in securities of larger companies.

Industrial Sector Risk: Industrial companies are affected by supply and demand both for their specific product or service and for industrial sector products and services in general. Government regulation, world events, exchange rates and economic conditions, technological developments and liabilities for environmental damage and general civil liabilities will likewise affect the performance of these companies. Aerospace and defense companies, a component of the industrial sector, can be significantly affected by government spending policies because companies involved in this industry rely, to a significant extent, on U.S. and foreign government demand for their products and services. Thus, the financial condition of, and investor interest in, aerospace and defense companies are heavily influenced by governmental defense spending policies which are typically under pressure from efforts to control the U.S. (and other) government budgets. Transportation securities, another component of the industrial sector, are cyclical and have occasional sharp price movements which may result from changes in the economy, fuel prices, labor agreements and insurance costs.

Consumer Discretionary Sector Risk: The success of consumer product manufacturers and retailers is tied closely to the performance of the overall global economy, interest rates, competition and consumer confidence. Success depends heavily on disposable household income and consumer spending. Also, companies in the consumer discretionary sector may be subject to severe competition, which may have an adverse impact on their respective profitability. Changes in demographics and consumer tastes can also affect the demand for, and success of, consumer products and services in the marketplace.

by the master fund. Substantial redemptions by other investors in a master fund may affect the master fund's investment program adversely and limit the ability of the master fund to achieve its objective.

Performance

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	30.41%	Q2 2020
Lowest Quarterly Return	-28.02%	Q1 2020

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Since Inception	Inception Date
Class A				10/15/2015
Return Before Taxes	10.68 %	8.60 %	9.85 %	10/15/2015
Return After Taxes on Distributions	10.04 %	7.04 %	8.30 %	10/15/2015
Return After Taxes on Distributions and Sale of Fund Shares	6.47 %	6.43 %	7.44 %	10/15/2015
Class I Returns Before Taxes	17.10 %	10.06 %	10.57 %	10/15/2015
Class K Returns Before Taxes	17.19 %	10.26 %	9.94 %	8/11/2015
Russell Small Cap Completeness Index (reflects no deduction for fees, expenses or taxes)	17.14 %	10.27 %	9.99 %
S&P 500 Index (reflects no deduction for fees, expenses or taxes)	25.02 %	14.53 %	13.72 %

The Fund will make updated performance information, including its current net asset value, available at the Fund's website: www.ssga.com.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund and the Portfolio.

The professionals primarily responsible for the day-to-day management of the Portfolio and the Fund are Karl Schneider and Ted Janowsky each of which has served as a portfolio manager of the Fund and the Portfolio since inception in 2015.

Karl Schneider, CAIA, is a Managing Director of the Adviser and Co-Head of the Systematic Equity Group in the Americas. He joined the Adviser in 1997.

Ted Janowsky, CFA, is a Vice President of the Adviser and a Senior Portfolio Manager in the Systematic Equity Group. He joined the Adviser in 2005.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Class A
To establish an account	$2,000
To add to an existing account	None
Class I
To establish an account	None
To add to an existing account	None
Class K
To establish an account	None
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

Written Requests and Wire Transfers. You may purchase or redeem Fund Shares by written request or wire transfer.

Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Intermediary:

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

Additional Information About Investment Objectives, Principal Strategies and Risks

Investment Objective

The State Street Institutional Investment Trust's (the “Trust”) Board of Trustees (the “Board”) may change each Fund's investment strategies and other policies without shareholder approval, except as otherwise indicated. The Board may change each Fund's investment objective without shareholder approval. If the Trustees were to approve a change to the Equity 500 Index Fund's investment objective, shareholders would receive advance notice.

State Street Aggregate Bond Index Fund

Principal Investment Strategies

In seeking to track the performance of the Index, the Fund employs a sampling strategy, which means that the Fund will not typically purchase all of the securities represented in the Index. Instead, the Fund may purchase a subset of the securities in the Index, or securities the Adviser considers to be comparable to securities in the Index, in an effort to hold a portfolio of securities with generally the same risk and return characteristics of the Index. The number of holdings in the Fund will be based on a number of factors, including asset size of the Fund. SSGA FM generally expects the Fund to hold fewer than the total number of securities in the Index, but reserves the right to hold as many securities as it believes necessary to achieve the Fund's investment objective.

state and local government series bonds are excluded from the Index. Also excluded from the Index are structured notes with embedded swaps or other special features, private placements and floating rate securities. The Index is market capitalization weighted and the securities in the Index are updated on the last business day of each month. It is not possible to invest directly in the Index.

Index Futures Contracts and Related Options. The Fund may buy and sell futures contracts and options on those futures contracts. An “index futures” contract is a contract to buy or sell units of an index at an agreed price on a specified future date. Depending on the change in value of the Index between the time when the Fund enters into and closes out an index future or option transaction, the Fund realizes a gain or loss. Options and futures transactions involve risks. For example, it is possible that changes in the prices of futures contracts will not correlate precisely with changes in the value of the Index. In those cases, use of futures contracts and related options might decrease the correlation between the return of the Fund and the return of the Index. In addition, the Fund incurs transaction costs in entering into, and closing out, positions in futures contracts and related options. Funds that enter into contracts with counterparties run the risk that the counterparty will be unwilling or unable to make timely settlement payments or otherwise honor its obligations. This risk is typically less for exchange-traded derivatives, such as those the Fund may invest in.

These costs typically have the effect of reducing the correlation between the return of the Fund and the return of the Index. Because the market for futures contracts and options may be illiquid, the Fund may have to hold a contract or option when the Adviser would otherwise have closed out the position, or it may only be able to close out at a price lower than what the Adviser believes is the fair value of the contract or option, thereby potentially reducing the return of the Fund.

Other Derivative Transactions. The Fund may enter into derivatives transactions involving options and swaps. These transactions involve many of the same risks as those described above under “Index Futures Contracts and Related Options.” In addition, since many of such transactions are conducted directly with counterparties, and not on an exchange or board of trade, the Fund's ability to realize any investment return on such transactions is generally subject to greater risk that the counterparty will be unable or unwilling to meet its obligations.

Additional Index Information. The components of the Index are reconstituted and rebalanced monthly.

State Street Equity 500 Index Fund

Principal Investment Strategies

The Fund generally intends to invest in all stocks comprising the S&P 500 in approximate proportion to their weightings in the Index. However, under various circumstances, it may not be possible or practicable to purchase all stocks in those weightings. In those circumstances, the Fund may purchase a sample of the stocks in the Index in proportions expected by SSGA FM to match generally the performance of the Index as a whole. In addition, from time to time, stocks are added to or removed from the Index. The Fund may sell securities that are represented in the Index, or purchase securities that are not yet represented in the Index, in anticipation of their removal from or addition to the Index. Under normal market conditions, the Fund will not invest less than 80% of its total assets in stocks in the Index. Shareholders will receive sixty (60) days' notice prior to a change in the 80% investment policy. For this purpose, “total assets” means net assets plus borrowings, if any. The notional value of the Fund's investments in derivatives or other synthetic instruments that provide exposures comparable, in the judgment of the Adviser, to investments in the Index may be counted toward satisfaction of this 80% policy. In addition, the Fund may invest in equity securities that are not included in the Index, cash and cash equivalents or money market instruments, such as repurchase agreements and money market funds (including money market funds advised by the Adviser).

The Fund may at times purchase or sell futures contracts, or options on those futures, in lieu of investing directly in the stocks making up the Index. The Fund might do so, for example, in order to increase its investment exposure pending investment of cash in the stocks comprising the Index. Alternatively, the Fund might use futures or options on futures to reduce its investment exposure in situations where it intends to sell a portion of the stocks in its portfolio but the sale has not yet been completed. The Fund may also enter into other derivatives transactions, including the use of options or swap transactions, in lieu of investing directly in the stocks making up the Index. The Fund may also, to the extent permitted by applicable law, invest in shares of other mutual funds whose investment objectives and policies are similar to those of the Fund (including funds advised by the Adviser).

The S&P 500 measures the performance of the large-cap segment of the market, is comprised of the stocks of 500 industry-leading companies and is considered to be a proxy of the U.S. equity stock market in general. The S&P 500 is unmanaged and does not reflect the actual cost of investing in the instruments that compose the Index. Additionally, the returns of the S&P 500 do not reflect the effect of fees, expenses and taxes. Index constituents are added and removed on an as-needed basis. The Index is rebalanced quarterly.

Stocks in the S&P 500 are weighted according to their float adjusted market capitalizations (i.e., the number of float shares outstanding multiplied by the stock's current price). The companies selected for inclusion in the S&P 500 are those of large publicly held companies which generally have large market values within their respective industries. The composition of the S&P 500 is determined by S&P Dow Jones Indices and is based on such factors as the domicile, exchange listing, organizational structure and share type, market capitalization, liquidity, financial viability, tracking stocks, multiple share classes and investable weight factor of each stock and its adequacy as a representation of stocks in a particular industry group, and may be changed from time to time. The S&P 500 is a product of S&P Dow Jones Indices LLC or its affiliates (“SPDJI”) and has been licensed for use by the Adviser. S&P®, Standard & Poor's®, and S&P 500® are registered trademarks of Standard & Poor's Financial Services LLC (“S&P”) and these trademarks have been licensed for use by SPDJI and sub-licensed for certain purposes by the Adviser.

the return of the Fund and the return of the Index. In addition, the Fund incurs transaction costs in entering into, and closing out, positions in futures contracts and related options. Funds that enter into contracts with counterparties run the risk that the counterparty will be unwilling or unable to make timely settlement payments or otherwise honor its obligations. This risk is typically less for exchange-traded derivatives, such as those the Fund may invest in.

State Street Global All Cap Equity ex-U.S. Index Fund

Principal Investment Strategies

The Fund may also purchase or sell futures contracts, or options on those futures, in lieu of investing directly in the stocks making up the Index. The Fund might do so, for example, in order to increase its investment exposure pending investment of cash in stocks or other investments. Alternatively, the Fund might use futures or options on futures to reduce its investment exposure in situations where it intends to sell a portion of the stocks in its portfolio but the sale has not yet been completed. The Fund may also enter into other derivatives transactions, including the use of options, forwards or swap transactions, in lieu of investing directly in the stocks making up the Index. The Fund may also, to the extent permitted by applicable law, invest in shares of other mutual funds whose investment objectives and policies are similar to those of the Fund (including funds advised by the Adviser).

mutual funds, ETFs, equity derivatives, limited partnerships and most investment trusts, are eligible for inclusion. Countries covered in the Index have historically included, among others, Australia, Austria, Belgium, Brazil, Canada, Chile, China, Colombia, Czech Republic, Denmark, Egypt, Finland, France, Germany, Greece, Hong Kong, Hungary, India, Indonesia, Ireland, Israel, Italy, Japan, Korea, Kuwait, Malaysia, Mexico, the Netherlands, New Zealand, Norway, Peru, Philippines, Poland, Portugal, Qatar, Saudi Arabia, Singapore, South Africa, Spain, Sweden, Switzerland, Taiwan, Thailand, Turkey, United Arab Emirates and the United Kingdom. It is not possible to invest directly in the Index.

Additional Index Information. The Index's components are reconstituted on an ongoing, event-driven basis and are rebalanced quarterly. The Index Provider classifies each issuer in one country. The Index Provider generally determines the country classification of an issuer based on the issuer's country of incorporation and the primary listing of its securities. To the extent that an issuer is incorporated in a different country than the country in which its securities are principally traded, the Index Provider considers the following additional set of criteria to determine the issuer's country classification: (i) the secondary listings of the issuer's securities, if any; (ii) the geographic distribution of the issuer's shareholder base; (iii) the location of the issuer's headquarters; (iv) the geographic distribution of the issuer's operations (in terms of assets and revenues); (v) the issuer's history with respect to these criteria; and (vi) the country in which investors consider the issuer to be most appropriately classified based on communications between the Index Provider and investors.

State Street Small/Mid Cap Equity Index Fund

Principal Investment Strategies

reconstituted annually to ensure new and growing equities are included. As of February 28, 2025, the market capitalization of the companies included in the Index ranged from $1.21 million to $122.09 billion. As of February 28, 2025, the Index comprised 2,457 securities. As of February 28, 2025, a significant portion of the Index comprised companies in the information technology, healthcare, industrials, financials and consumer discretionary sectors, although this may change from time to time.

The Fund generally intends to invest in all stocks comprising the Index in approximate proportion to their weightings in the Index. However, under various circumstances, it may not be possible or practicable to purchase all stocks in those weightings. In those circumstances, the Fund may purchase a sample of the stocks in the Index in proportions expected by SSGA FM to match generally the performance of the Index as a whole. In addition, from time to time, stocks are added to or removed from the Index. The Fund may sell securities that are represented in the Index, or purchase securities that are not yet represented in the Index, in anticipation of their removal from or addition to the Index. Under normal market conditions, the Fund invests at least 80% of its net assets (plus borrowings, if any) in stocks in the Index. The Fund will provide shareholders with at least sixty (60) days' notice prior to any change in this 80% investment policy. The notional value of the Fund's investments in derivatives or other synthetic instruments that provide exposures comparable, in the judgment of the Adviser, to investments in the Index may be counted toward satisfaction of this 80% policy. In addition, the Fund may invest in equity securities that are not included in the Index, cash and cash equivalents or money market instruments, such as repurchase agreements and money market funds (including money market funds advised by the Adviser).

Additional Index Information. The Index's components are reconstituted annually and rebalanced monthly.

Additional Information About Risks

The Funds are subject to the following principal risks. The risks are described in alphabetical order and not in the order of importance or potential exposure. Each principal risk without a parenthetical indicating a single Fund's name is applicable to each Fund.

Call/Prepayment Risk (principal risk for the Aggregate Bond Index Fund). Call/prepayment risk is the risk that an issuer will exercise its right to pay principal on an obligation held by a Fund earlier than expected or required. This may occur, for example, when there is a decline in interest rates, and an issuer of bonds or preferred stock redeems the bonds or stock in order to replace them with obligations on which it is required to pay a lower interest or dividend rate. It may also occur when there is an unanticipated increase in the rate at which mortgages or other receivables underlying mortgage- or asset-backed securities held by a Fund are prepaid. In any such case, a Fund may be forced to invest the prepaid amounts in lower-yielding investments, resulting in a decline in the Fund's income.

Consumer Discretionary Sector Risk (principal risk for the Small/Mid Cap Equity Index Fund). The success of consumer product manufacturers and retailers is tied closely to the performance of the overall global economy, interest rates, competition and consumer confidence. Success depends heavily on disposable household income and consumer spending. Also, companies in the consumer discretionary sector may be subject to severe competition, which may have an adverse impact on their respective profitability. Changes in demographics and consumer tastes can also affect the demand for, and success of, consumer products and services in the marketplace.

Counterparty Risk. A Fund will be subject to credit risk with respect to the counterparties with which the Fund enters into derivatives contracts and other transactions such as repurchase agreements or reverse repurchase agreements. A Fund's ability to profit from these types of investments and transactions will depend on the willingness and ability of its counterparty to perform its obligations. If a counterparty fails to meet its contractual obligations, a Fund may be unable to terminate or realize any gain on the investment or transaction, resulting in a loss to the Fund. A Fund may experience significant delays in obtaining any recovery in an insolvency, bankruptcy, or other reorganization proceeding involving its counterparty (including recovery of any collateral posted by it) and may obtain only a limited recovery or may obtain no recovery in such circumstances. If a Fund holds collateral posted by its counterparty, it may be delayed or prevented from realizing on the collateral in the event of a bankruptcy or insolvency proceeding relating to the counterparty. Under applicable law or contractual provisions, including if a Fund enters into an investment or transaction with a financial institution and such financial institution (or an affiliate of the financial institution) experiences financial difficulties, then the Fund may in certain situations be prevented or delayed from exercising its rights to terminate the investment or transaction, or to realize on any collateral and may result in the suspension of payment and delivery obligations of the parties under such investment or transactions or in another institution being substituted for that financial institution without the consent of the Fund. Further, a Fund may be subject to “bail-in” risk under applicable law whereby, if required by the financial institution's authority, the financial institution's liabilities could be written down, eliminated or converted into equity or an alternative instrument of ownership. A bail-in of a financial institution may result in a reduction in value of some or all of its securities and, if a Fund holds such securities or has entered into a transaction with such a financial security when a bail-in occurs, such Fund may also be similarly impacted.

Credit Risk (principal risk for the Aggregate Bond Index Fund). Credit risk is the risk that an issuer, guarantor or liquidity provider of a fixed-income security held by a Fund may be unable or unwilling, or may be perceived (whether by market participants, ratings agencies, pricing services or otherwise) as unable or unwilling, to make timely principal and/or interest payments, or to otherwise honor its obligations. It includes the risk that the security will be downgraded by a credit rating agency; generally, lower credit quality issuers present higher credit risks. An actual or perceived decline in creditworthiness of an issuer of a fixed-income security held by a Fund may result in a decrease in the value of the security. It is possible that the ability of an issuer to meet its obligations will decline substantially during the period when a Fund owns securities of the issuer or that the issuer will default on its obligations or that the obligations of the issuer will be limited or restructured.

The credit rating assigned to any particular investment does not necessarily reflect the issuer's current financial condition and does not reflect an assessment of an investment's volatility or liquidity. Securities rated in the lowest category of investment-grade are considered to have speculative characteristics. If a security held by a Fund loses its rating or its rating is downgraded, the Fund may nonetheless continue to hold the security in the discretion of the Adviser. In the case of asset-backed or mortgage-related securities, changes in the actual or perceived ability of the obligors on the underlying assets or mortgages to make payments of interest and/or principal may affect the values of those securities.

Currency Risk (principal risk for the Global All Cap Equity ex-U.S. Index Fund). Investments in issuers in different countries are often denominated in currencies other than the U.S. dollar. Changes in the values of those currencies relative to the U.S. dollar may have a positive or negative effect on the values of a Fund's investments denominated in those currencies. The values of other currencies relative to the U.S. dollar may fluctuate in response to, among other factors, interest rate changes, intervention (or failure to intervene) by national governments, central banks, or supranational entities such as the International Monetary Fund, the imposition of currency controls, and other political or regulatory developments. Currency values can decrease significantly both in the short term and over the long term in response to these and other developments. Continuing uncertainty as to the status of the Euro and the Economic and Monetary Union of the European Union (the “EMU”) has created significant volatility in currency and financial markets generally. Any partial or complete dissolution of the EMU, or any continued uncertainty as to its status, could have significant adverse effects on currency and financial markets, and on the values of a Fund's portfolio investments.

Debt Securities Risk (principal risk for the Aggregate Bond Index Fund). The values of debt securities may increase or decrease as a result of the following: market fluctuations, changes in interest rates, actual or perceived inability or unwillingness of issuers, guarantors or liquidity providers to make scheduled principal or interest payments or illiquidity in debt securities markets. To the extent that interest rates rise, certain underlying obligations may be paid off substantially slower than originally anticipated and the value of those securities may fall sharply. A rising interest rate environment may cause the value of a Fund's fixed income securities to decrease, an adverse impact on the liquidity of a Fund's fixed income securities, and increased volatility of the fixed income markets. During periods when interest rates are at low levels, a Fund's yield can be low, and a Fund may have a negative yield (i.e., it may lose money on an operating basis). To the extent that interest rates fall, certain underlying obligations may be paid off substantially faster than originally anticipated. If the principal on a debt obligation is prepaid before expected, the prepayments of principal may have to be reinvested in obligations paying interest at lower rates. During periods of falling interest rates, the income received by a Fund may decline. Changes in interest rates will likely have a greater effect on the values of debt securities of longer durations. Returns on investments in debt securities could trail the returns on other investment options, including investments in equity securities. High levels of inflation and/or a significantly changing interest rate environment can lead to heightened levels of volatility and reduced liquidity.

Depositary Receipts Risk (principal risk for the Global All Cap Equity ex-U.S. Index Fund). American Depositary Receipts (“ADRs”) are typically trust receipts issued by a U.S. bank or trust company that evidence an indirect interest in underlying securities issued by a foreign entity. Global Depositary Receipts (“GDRs”), European Depositary Receipts (“EDRs”), and other types of depositary receipts are typically issued by non-U.S. banks or financial institutions to evidence an interest in underlying securities issued by either a U.S. or a non-U.S. entity. Investments in non-U.S. issuers through ADRs, GDRs, EDRs, and other types of depositary receipts generally involve risks applicable to other types of investments in non-U.S. issuers. Investments in depositary receipts may be less liquid and more volatile than the underlying securities in their primary trading market. If a depositary receipt is denominated in a different currency than its underlying securities, the Portfolio and, therefore, the Fund will be subject to the currency risk of both the investment in the depositary receipt and the underlying security. There may be less publicly available information regarding the issuer of the securities underlying a depositary receipt than if those securities were traded directly in U.S. securities markets. Depositary receipts may or may not be sponsored by the issuers of the underlying securities, and information regarding issuers of

securities underlying unsponsored depositary receipts may be more limited than for sponsored depositary receipts. The values of depositary receipts may decline for a number of reasons relating to the issuers or sponsors of the depositary receipts, including, but not limited to, insolvency of the issuer or sponsor. Holders of depositary receipts may have limited or no rights to take action with respect to the underlying securities or to compel the issuer of the receipts to take action. The prices of depositary receipts may differ from the prices of securities upon which they are based. To the extent the Fund invests in depositary receipts based on securities included in the Index, such differences in prices may increase index tracking risk.

Derivatives Risk. A derivative is a financial contract the value of which depends on, or is derived from, the value of an underlying asset, interest rate, or index. Derivative transactions typically involve leverage and may have significant volatility. It is possible that a derivative transaction will result in a loss greater than the principal amount invested, that changes in the value of a derivative transaction may not correlate perfectly with the underlying asset, and that a Fund may not be able to close out a derivative transaction at a favorable time or price. Risks associated with derivative instruments include potential changes in value in response to interest rate changes or other market developments or as a result of the counterparty's credit quality; the potential for the derivative transaction not to have the effect the Adviser anticipated or a different or less favorable effect than the Adviser anticipated; the failure of the counterparty to the derivative transaction to perform its obligations under the transaction or to settle a trade; possible mispricing or improper valuation of the derivative instrument; imperfect correlation in the value of a derivative with the asset, rate, or index underlying the derivative; the risk that a Fund may be required to post collateral or margin with its counterparty, and will not be able to recover the collateral or margin in the event of the counterparty's insolvency or bankruptcy; the risk that a Fund will experience losses on its derivatives investments and on its other portfolio investments, even when the derivatives investments may be intended in part or entirely to hedge those portfolio investments; the risks specific to the asset underlying the derivative instrument; lack of liquidity for the derivative instrument, including, without limitation, absence of a secondary trading market; the potential for reduced returns to a Fund due to losses on the transaction and an increase in volatility; the potential for the derivative transaction to have the effect of accelerating the recognition of gain; and legal risks arising from the documentation relating to the derivative transaction.

Emerging Markets Risk (principal risk for the Global All Cap Equity ex-U.S. Index Fund). Investments in emerging markets are generally subject to a greater risk of loss than investments in developed markets. This may be due to, among other things, the possibility of greater market volatility, lower trading volume and liquidity, greater risk of expropriation, nationalization, and social, political and economic instability, greater reliance on a few industries, international trade or revenue from particular commodities, less developed accounting, legal and regulatory systems, increased potential for market manipulation, higher levels of inflation, deflation or currency devaluation, greater risk of market shutdown, and more significant governmental limitations on investment policy as compared to those typically found in a developed market. The Public Company Accounting Oversight Board, which regulates auditors of U.S. public companies, is unable to inspect audit work papers in certain foreign countries. Investors in foreign countries often have limited rights and few practical remedies to pursue shareholder claims, including class actions or fraud claims, and the ability of the U.S. Securities and Exchange Commission, the U.S. Department of Justice and other authorities to bring and enforce actions against foreign issuers or foreign persons is limited. In addition, issuers (including governments) in emerging market countries may have less financial stability than in other countries. The securities of emerging market companies may trade less frequently and in smaller volumes than more widely held securities. Market disruptions or substantial market corrections may limit very significantly the liquidity of securities of certain companies in a particular country or geographic region, or of all companies in the country or region. A Fund may be unable to liquidate its positions in such securities at any time, or at a favorable price, in order to meet the Fund's obligations. There is also the potential for unfavorable action such as embargoes and acts of war. As a result, there will tend to be an increased risk of price volatility in investments in emerging market countries, which may be magnified by currency fluctuations relative to the U.S. dollar. Settlement and asset custody practices for transactions in emerging markets may differ from those in developed markets. Such differences may include possible delays in settlement and certain settlement practices, such as delivery of securities prior to receipt of payment, which increase the likelihood of a “failed settlement.” Failed settlements can result in losses. For these and other reasons, investments in emerging markets are often considered speculative.

Equity Investing Risk (principal risk for the Equity 500 Index Fund, Global All Cap Equity ex-U.S. Index Fund and Small/Mid Cap Equity Index Fund). The market prices of equity securities owned by a Fund may go up or down, sometimes rapidly or unpredictably. The value of a security may decline for a number of reasons that may directly relate to the issuer, such as management performance, financial leverage, non-compliance with regulatory requirements, and reduced demand for the issuer's goods or services. The values of equity securities also may decline due to general industry or market

conditions that are not specifically related to a particular company, such as real or perceived adverse economic conditions, changes in the general outlook for corporate earnings, changes in interest or currency rates, or adverse investor sentiment generally. In addition, equity markets tend to move in cycles, which may cause stock prices to fall over short or extended periods of time.

Extension Risk (principal risk for the Aggregate Bond Index Fund). During periods of rising interest rates, the average life of certain types of securities may be extended because of slower-than-expected principal payments. This may increase the period of time during which an investment earns a below-market interest rate, increase the security's duration and reduce the value of the security. Extension risk may be heightened during periods of adverse economic conditions generally, as payment rates decline due to higher unemployment levels and other factors.

Financial Sector Risk (principal risk for the Equity 500 Index Fund, Global All Cap Equity ex-U.S. Index and Small/Mid Cap Equity Index Fund). Financial services companies are subject to extensive governmental regulation, which may limit both the amounts and types of loans and other financial commitments they can make, the interest rates and fees they can charge, the scope of their activities, the prices they can charge and the amount of capital they must maintain. Profitability is largely dependent on the availability and cost of capital funds and can fluctuate significantly when interest rates change or due to increased competition. In addition, deterioration of the credit markets generally may cause an adverse impact in a broad range of markets, including U.S. and international credit and interbank money markets generally, thereby affecting a wide range of financial institutions and markets. Certain events in the financial sector may cause an unusually high degree of volatility in the financial markets, both domestic and foreign, and cause certain financial services companies to incur large losses. Securities of financial services companies may experience a dramatic decline in value when such companies experience substantial declines in the valuations of their assets, take action to raise capital (such as the issuance of debt or equity securities), or cease operations. Credit losses resulting from financial difficulties of borrowers and financial losses associated with investment activities can negatively impact the sector. Insurance companies may be subject to severe price competition. Adverse economic, business or political developments could adversely affect financial institutions engaged in mortgage finance or other lending or investing activities directly or indirectly connected to the value of real estate.

Geographic Focus Risk (principal risk for the Global All Cap Equity ex-U.S. Index Fund). The performance of a fund that invests significantly in one or more countries or geographic regions will be closely tied to market, currency, economic, political, environmental, or regulatory conditions and developments in the countries or regions in which the fund invests, and may be more volatile than the performance of a fund that does not invest significantly in such countries or regions.

China. The economy of China differs, often unfavorably, from the U.S. economy in such respects as structure, general development, government involvement, wealth distribution, rate of inflation, growth rate, allocation of resources and capital reinvestment, among others. Under China's political and economic system, the central government has historically exercised substantial control over virtually every sector of the Chinese economy through administrative regulation and/or state ownership. Since 1978, the Chinese government has been, and is expected to continue, reforming its economic policies, which has resulted in less direct central and local government control over the business and production activities of Chinese enterprises and companies. Notwithstanding the economic reforms instituted by the Chinese government and the Chinese Communist Party, actions of the Chinese central and local government authorities continue to have a substantial effect on economic conditions in China, which could affect the public and private sector companies in which a Fund invests. In the past, the Chinese government has from time to time taken actions that influence the prices at which certain goods may be sold, encourage companies to invest or concentrate in particular industries, induce mergers between companies in certain industries and induce private companies to publicly offer their securities to increase or continue the rate of economic growth, control the rate of inflation or otherwise regulate economic expansion. It may do so in the future as well. The Chinese government also may intervene or seek to control the operations, structure, or ownership of Chinese companies, including with respect to foreign investors of such companies. Such actions and a variety of other centrally planned or determined activities by the Chinese government could have a significant adverse effect on economic conditions in China, the economic prospects for, and the market prices and liquidity of, the securities of Chinese companies and the payments of dividends and interest by Chinese companies. In addition, expropriation, including nationalization, confiscatory taxation, political, economic or social instability or other developments could adversely affect and significantly diminish the values of the Chinese companies in which a Fund invests. International trade tensions may arise from time to time which can result in trade tariffs, embargoes, trade limitations, trade wars and other negative consequences. These consequences may trigger a reduction in international trade, the oversupply of certain manufactured goods, substantial price reductions of goods and possible failure of individual companies and/or large segments of China's

export industry with a potentially severe negative impact to a Fund. A Fund may invest in shares of Chinese companies traded on stock markets in Mainland China or Hong Kong, which may experience high levels of volatility. The Hong Kong stock market may behave differently from the Mainland China stock market and there may be little to no correlation between the performance of the Hong Kong stock market and the Mainland China stock market.

A Fund may also gain investment exposure to certain Chinese companies through variable interest entity (“VIE”) structures. Such investments are subject to the investment risks associated with the Chinese-based company. The VIE structure enables foreign investors, such as a Fund, to obtain investment exposure to a Chinese company in situations in which the Chinese government has limited or prohibited non-Chinese ownership of such company. The VIE structure does not involve direct equity ownership in a China-based company, but rather involves claims to the China-based company's profits and control of the assets that belong to the China-based company through contractual arrangements. Intervention by the Chinese government with respect to the VIE structure could significantly affect the Chinese operating company's performance and thus, the value of a Fund's investment through a VIE structure, as well as the enforceability of the contractual arrangements of the VIE structure. In the event of such an occurrence, a Fund, as a foreign investor, may have little or no legal recourse. In addition to the risk of government intervention, investments through a VIE structure are subject to the risk that the China-based company (or its officers, directors, or Chinese equity owners) may breach the contractual arrangements, or Chinese law changes in a way that adversely affects the enforceability of the arrangements, or the contracts are otherwise not enforceable under Chinese law, in which case a Fund may suffer significant losses on its investments through a VIE structure with little or no recourse available.

From time to time, certain of the companies comprising the Index may operate in, or have dealings with, countries subject to sanctions or embargoes imposed by the U.S. government and the United Nations and/or in countries identified by the U.S. government as state sponsors of terrorism. One or more of these companies may be subject to constraints under U.S. law or regulations which could negatively affect the company's performance. Additionally, one or more of these companies may suffer damage to its reputation if it is identified as a company which invests or deals with countries which are identified by the U.S. government as state sponsors of terrorism or subject to sanctions. As an investor in such companies, a Fund will be indirectly subject to these risks.

Europe. The Economic and Monetary Union of the EU requires compliance with restrictions on inflation rates, deficits, interest rates, debt levels and fiscal and monetary controls, each of which may significantly affect every country in Europe. Decreasing imports or exports, changes in governmental or EU regulations on trade, changes in the exchange rate of the euro (the common currency of certain EU countries), the default or threat of default by an EU member country on its sovereign debt, and/or an economic recession in an EU member country may have a significant adverse effect on the economies of EU member countries and their trading partners. The European financial markets have recently experienced volatility and adverse trends due to concerns about economic downturns or rising government debt levels in several European countries, including Greece, Ireland, Italy, Portugal and Spain. These events have adversely affected the exchange rate of the euro and may continue to significantly affect every country in Europe, including countries that do not use the euro.

Responses to the financial problems by European governments, central banks and others, including austerity measures and reforms, may not produce the desired results, may result in social unrest and may limit future growth and economic recovery or have other unintended consequences. Further defaults or restructurings by governments and other entities of their debt could have additional adverse effects on economies, financial markets and asset valuations around the world. In addition, one or more countries may abandon the euro and/or withdraw from the EU. On January 31, 2020, the United Kingdom (“UK”) formally withdrew from the European Union (“EU”) (commonly known as “Brexit”). An agreement between the UK and the EU governing their future trade relationship became effective January 1, 2021, but that agreement does not include an agreement on financial services, and it is unlikely that such agreement will be concluded. Moreover, the UK government has started a program of financial services law reform with the ultimate aim of repealing many EU financial services laws that were assimilated into UK law from January 1, 2021, and replacing them with legislation or rules made by the UK government or financial services regulators. Accordingly, uncertainty remains in certain areas as to the future relationship between the UK and the EU. Brexit has already had a significant impact on the UK, Europe, and global economies, and could continue to result in volatility and illiquidity, legal, political, economic and regulatory uncertainties and lower economic growth for these economies that could in turn have an adverse effect on the value of the Fund's investments. Any further exits from the EU, or the possibility of such exits, or the abandonment of the euro, may cause additional market disruption globally and introduce new legal and regulatory uncertainties. In addition, a number of countries in Europe have suffered terror

ist attacks and additional attacks may occur in the future. Such attacks may cause uncertainty in financial markets and may adversely affect the performance of the issuers to which the Fund has exposure.

Japan. The growth of Japan's economy has historically lagged that of its Asian neighbors and other major developed economies. The Japanese economy is heavily dependent on international trade and has been adversely affected by trade tariffs, other protectionist measures, competition from emerging economies and the economic conditions of its trading partners. China has become an important trading partner with Japan, yet the countries' political relationship has become strained. Should political tension increase, it could adversely affect the economy, especially the export sector, and destabilize the region as a whole. Japan also remains heavily dependent on oil imports, and higher commodity prices could therefore have a negative impact on the economy. The Japanese economy faces several other concerns, including a financial system with large levels of nonperforming loans, over-leveraged corporate balance sheets, extensive cross-ownership by major corporations, a changing corporate governance structure, and large government deficits. These issues may cause a slowdown of the Japanese economy. The Japanese yen has fluctuated widely at times and any increase in its value may cause a decline in exports that could weaken the Japanese economy. Japan has, in the past, intervened in the currency markets to attempt to maintain or reduce the value of the yen. Japanese intervention in the currency markets could cause the value of the yen to fluctuate sharply and unpredictably and could cause losses to investors. Japan has an aging workforce and has experienced a significant population decline in recent years. Japan's labor market appears to be undergoing fundamental structural changes, as a labor market traditionally accustomed to lifetime employment adjusts to meet the need for increased labor mobility, which may adversely affect Japan's economic competitiveness.

United Kingdom. The UK has one of the largest economies in Europe, and the United States and other European countries are substantial trading partners of the UK. As a result, the British economy may be impacted by changes to the economic condition of the United States and other European countries. The British economy relies heavily on the export of financial services to the United States and other European countries and, therefore, a prolonged slowdown in the financial services sector may have a negative impact on the British economy. Continued governmental involvement or control in certain sectors may stifle competition in certain sectors or cause adverse effects on economic growth. In the past, the UK has been a target of terrorism. Acts of terrorism in the UK or against British interests abroad may cause uncertainty in the British financial markets and adversely affect the performance of the issuers to which a Fund has exposure.

Healthcare Sector Risk (principal risk for the Equity 500 Index Fund and Small/Mid Cap Equity Index Fund). Companies in the healthcare sector are subject to extensive government regulation and their profitability can be significantly affected by restrictions on government reimbursement for medical expenses, rising costs of medical products and services, pricing pressure (including price discounting), limited product lines and an increased emphasis on the delivery of healthcare through outpatient services. Companies in the healthcare sector are heavily dependent on obtaining and defending patents, which may be time consuming and costly, and the expiration of patents may also adversely affect the profitability of these companies. Healthcare companies are also subject to extensive litigation based on product liability and similar claims. In addition, their products can become obsolete due to industry innovation, changes in technologies or other market developments. Many new products in the healthcare sector require significant research and development and may be subject to regulatory approvals, all of which may be time consuming and costly with no guarantee that any product will come to market.

Income Risk (principal risk for the Aggregate Bond Index Fund). A Fund's income may decline due to falling interest rates or other factors. Issuers of securities held by a Fund may call or redeem the securities during periods of falling interest rates, and the Fund would likely be required to reinvest in securities paying lower interest rates. If an obligation held by a Fund is prepaid, the Fund may have to reinvest the prepayment in other obligations paying income at lower rates. A reduction in the income earned by a Fund may limit the Fund's ability to achieve its objective.

composition of the Index will affect the performance, volatility, and risk of the Index (in absolute terms and by comparison with other indices) and, consequently, the performance, volatility, and risk of a Fund. Errors in index data, index computations or the construction of the Index in accordance with its methodology may occur from time to time and may not be identified and corrected by the Index Provider for a period of time or at all, which may have an adverse impact on a Fund and its shareholders. While the Adviser seeks to track the performance of the Index (i.e., achieve a high degree of correlation with the Index), a Fund's return may not match the return of the Index for a number of reasons. For example, the return on the sample of securities purchased by a Fund (or the return on securities not included in the Index) to replicate the performance of the Index may not correlate precisely with the return of the Index. Each Fund incurs a number of operating expenses not applicable to the Index, and incurs costs in buying and selling securities. In addition, a Fund may not be fully invested at times, either as a result of cash flows into or out of the Fund or reserves of cash held by the Fund to meet redemptions. The Adviser may attempt to track the Index return by investing in fewer than all of the securities in the Index, or in some securities not included in the Index, potentially increasing the risk of divergence between a Fund's return and that of the Index. Changes in the composition of the Index and regulatory requirements also may impact a Fund's ability to match the return of the Index. The Adviser may apply one or more “screens” or investment techniques to refine or limit the number or types of issuers included in the Index in which a Fund may invest. Application of such screens or techniques may result in investment performance below that of the Index and may not produce results expected by the Adviser. Index tracking risk may be heightened during times of increased market volatility or other unusual market conditions.

Industrial Sector Risk (principal risk for the Global All Cap Equity ex-U.S. Index Fund and Small/Mid Cap Equity Index Fund). Industrial companies are affected by supply and demand both for their specific product or service and for industrial sector products and services in general. Government regulation, world events, exchange rates and economic conditions, technological developments and liabilities for environmental damage and general civil liabilities will likewise affect the performance of these companies. Aerospace and defense companies, a component of the industrial sector, can be significantly affected by government spending policies because companies involved in this industry rely, to a significant extent, on U.S. and foreign government demand for their products and services. Thus, the financial condition of, and investor interest in, aerospace and defense companies are heavily influenced by governmental defense spending policies which are typically under pressure from efforts to control the U.S. (and other) government budgets. Transportation securities, another component of the industrial sector, are cyclical and have occasional sharp price movements which may result from changes in the economy, fuel prices, labor agreements and insurance costs.

Inflation Risk (principal risk for the Aggregate Bond Index Fund). Inflation risk is the risk that the value of assets or income from investments will be less in the future as inflation decreases the value of money. As inflation increases, the values of a Fund's assets can decline. Inflation rates may change frequently and drastically as a result of various factors, including unexpected shifts in the domestic or global economy (or expectations that domestic or global economic policies will change), and the Fund's investments may not keep pace with inflation, which may result in losses to Fund investors or adversely affect the real value of shareholders' investments in the Fund. As such, fixed income securities markets may experience heightened levels of interest rate volatility and liquidity risk.

Information Technology Sector Risk (principal risk for the Equity 500 Index Fund, Global All Cap Equity ex-U.S. Index Fund and Small/Mid Cap Equity Index Fund). Market or economic factors impacting information technology companies could have a major effect on the value of the Fund's investments. The value of stocks of information technology companies is particularly vulnerable to rapid changes in technology product cycles, rapid product obsolescence, government regulation and competition, both domestically and internationally, including competition from foreign competitors with lower production costs. Like other technology companies, information technology companies may have limited product lines, markets, financial resources or personnel. Stocks of technology companies and companies that rely heavily on technology, especially those of smaller, less-seasoned companies, tend to be more volatile than the overall market. Information technology companies are heavily dependent on patent and intellectual property rights, the loss or impairment of which may adversely affect profitability. Additionally, companies in the information technology sector may face dramatic and often unpredictable changes in growth rates and competition for the services of qualified personnel.

Interest Rate Risk (principal risk for the Aggregate Bond Index Fund). Interest rate risk is the risk that the securities held by a Fund will decline in value because of increases in market interest rates. Duration is a measure used to determine the sensitivity of a security's price to changes in interest rates. Debt securities with longer durations tend to be more sensitive to changes in interest rates, usually making them more volatile than debt securities with shorter durations. For example, the value of a security with a duration of five years would be expected to decrease by 5% for every 1% increase in interest rates. Falling interest rates also create the potential for a decline in a Fund's income and yield. Interest-only

and principal-only securities are especially sensitive to interest rate changes, which can affect not only their prices but can also change the income flows and repayment assumptions about those investments. Variable and floating rate securities also generally increase or decrease in value in response to changes in interest rates, although generally to a lesser degree than fixed-rate securities. A substantial increase in interest rates may also have an adverse impact on the liquidity of a security, especially those with longer durations. Changes in governmental policy, including changes in central bank monetary policy, could cause interest rates to rise rapidly, or cause investors to expect a rapid rise in interest rates. This could lead to heightened levels of interest rate, volatility and liquidity risks for the fixed income markets generally and could have a substantial and immediate effect on the values of a Fund's investments. High levels of inflation and/or a significantly changing interest rate environment can lead to heightened levels of volatility and reduced liquidity.

Large-Capitalization Securities Risk (principal risk for the Equity 500 Index Fund and the Global All Cap Equity ex-U.S. Index Fund). Securities issued by large-capitalization companies may present risks not present in smaller companies. For example, larger companies may be unable to respond as quickly as smaller and mid-sized companies to competitive challenges or to changes in business, product, financial, or other market conditions. Larger companies may not be able to maintain growth at the high rates that may be achieved by well-managed smaller and mid-sized companies, especially during strong economic periods. Returns on investments in securities of large companies could trail the returns on investments in securities of smaller and mid-sized companies.

Large Transactions Risk. To the extent a large proportion of the shares of a Portfolio or Fund are highly concentrated or held by a small number of shareholders (or a single shareholder), including funds or accounts over which the Adviser has investment discretion, a Fund is subject to the risk that these shareholders will purchase or redeem Portfolio or Fund shares in large amounts rapidly or unexpectedly, including as a result of an asset allocation decision made by the Adviser. In addition, a large number of shareholders collectively may purchase or redeem Portfolio or Fund shares in large amounts rapidly or unexpectedly (collectively, such transactions are referred to as “large shareholder transactions”). Large shareholder transactions could adversely affect the ability of a Fund to conduct its investment program. For example, they could require a Portfolio or Fund to sell portfolio securities or purchase portfolio securities unexpectedly and incur substantial transaction costs and/or accelerate the realization of taxable income and/or gains to shareholders. The effects of taxable income and/or gains resulting from large shareholder transactions would particularly impact non-redeeming shareholders who do not hold their Fund shares in an IRA, 401(k) plan or other tax-advantaged plan. To the extent that such transactions result in short-term capital gains, such gains will generally be taxed at the ordinary income tax rate for shareholders who hold Fund shares in a taxable account. In addition, a Portfolio or Fund may be required to sell its more liquid portfolio investments to meet a large redemption, in which case a Fund's remaining assets may be less liquid, more volatile, and more difficult to price. A Portfolio or Fund may hold a relatively large proportion of its assets in cash in anticipation of large redemptions, diluting its investment returns. A number of circumstances may cause a Portfolio or Fund to experience large redemptions, such as changes in investors' circumstances; changes in the eligibility criteria for a Fund or share class of the Fund; liquidations, reorganizations, repositionings, or other announced Fund events; or changes in investment objectives, strategies, policies, risks, or investment personnel.

Leveraging Risk. Borrowing transactions, reverse repurchase agreements, certain derivatives transactions, securities lending transactions and other investment transactions such as when-issued, delayed-delivery, or forward commitment transactions may create investment leverage. If a Fund engages in transactions that have a leveraging effect on the Fund's investment portfolio, the value of the Fund will be potentially more volatile and all other risks will tend to be compounded. This is because leverage generally creates investment risk with respect to a larger base of assets than a Fund would otherwise have and so magnifies the effect of any increase or decrease in the value of the Fund's underlying assets. The use of leverage is considered to be a speculative investment practice and may result in losses to a Fund. Certain derivatives have the potential for unlimited loss, regardless of the size of the initial investment. The use of leverage may cause a Fund to liquidate positions when it may not be advantageous to do so to satisfy repayment, interest payment, or margin obligations.

Liquidity Risk. Liquidity risk is the risk that a Fund may not be able to dispose of investments readily at a favorable time or prices (or at all) or at prices approximating those at which a Fund currently values them. For example, certain investments may be subject to restrictions on resale, may trade in the over-the-counter market or in limited volume, or may not have an active trading market. Illiquid investments may trade at a discount from comparable, more liquid investments and may be subject to wide fluctuations in market value. It may be difficult for a Fund to value illiquid investments accurately. The market for certain investments may become illiquid under adverse market or economic conditions independent of any specific adverse changes in the conditions of a particular issuer. Disposal of illiquid investments may entail registration expenses and other transaction costs that are higher than those for liquid investments. A Fund may seek to borrow

money to meet its obligations (including among other things redemption obligations) if it is unable to dispose of illiquid investments, resulting in borrowing expenses and possible leveraging of the Fund. In some cases, due to unanticipated levels of illiquidity a Fund may choose to meet its redemption obligations wholly or in part by distributions of assets in-kind.

The term “illiquid investments” for this purpose means investments that a Fund reasonably expects cannot be sold or disposed of in current market conditions in seven calendar days or less without the sale or disposition significantly changing the market value of the investments. If any Fund determines at any time that it owns illiquid investments in excess of 15% of its net assets, it will cease to undertake new commitments to acquire illiquid investments until its holdings are no longer in excess of 15% of its NAV, report the occurrence in compliance with Rule 30b1-10 under the 1940 Act and, depending on circumstances, may take additional steps to reduce its holdings of illiquid investments. The U.S. Securities and Exchange Commission (“SEC”) has recently proposed rule amendments that, if adopted as proposed, could result in a larger percentage of the Fund's investments being classified as illiquid investments.

Market Disruption and Geopolitical Risk. A Fund is subject to the risk that geopolitical events will disrupt securities markets and adversely affect global economies and markets. War, terrorism, and related geopolitical events have led, and in the future may lead, to increased short-term market volatility and may have adverse long-term effects on U.S. and world economies and markets generally. Likewise, trade policy changes or disputes, natural and environmental disasters, pandemics and epidemics, and systemic market dislocations may be highly disruptive to economies and markets. Those events, as well as other changes in foreign and domestic economic and political conditions, also could adversely affect individual issuers or related groups of issuers, securities markets, interest rates, credit ratings, inflation, investor sentiment, and other factors affecting the value of a Fund's investments. Given the increasing interdependence among global economies and markets, conditions in one country, market, or region might adversely affect markets, issuers, and/or foreign exchange rates in other countries, including the U.S. Any partial or complete dissolution of the EMU, or any increased uncertainty as to its status, could have significant adverse effects on currency and financial markets, and on the values of a Fund's investments. On January 31, 2020, the United Kingdom (“UK”) formally withdrew from the European Union (“EU”) (commonly known as “Brexit”). An agreement between the UK and the EU governing their future trade relationship became effective January 1, 2021, but that agreement does not include an agreement on financial services, and it is unlikely that such agreement will be concluded. Moreover, the UK government has started a program of financial services law reform with the ultimate aim of repealing many EU financial services laws that were assimilated into UK law from January 1, 2021, and replacing them with legislation or rules made by the UK government or financial services regulators. Accordingly, uncertainty remains in certain areas as to the future relationship between the UK and the EU. Brexit has already had a significant impact on the UK, Europe, and global economies, and could continue to result in volatility and illiquidity, legal, political, economic and regulatory uncertainties and lower economic growth for these economies that could in turn have an adverse effect on the value of the Fund's investments. Any further exits from the EU, or the possibility of such exits, or the abandonment of the euro, may cause additional market disruption globally and introduce new legal and regulatory uncertainties.

Securities and financial markets may be susceptible to market manipulation or other fraudulent trade practices, which could disrupt the orderly functioning of these markets or adversely affect the values of investments traded in these markets, including investments held by a Fund. To the extent a Fund has focused its investments in the market or index of a particular region, adverse geopolitical and other events could have a disproportionate impact on the Fund.

Market Risk. Market prices of investments held by a Fund will go up or down, sometimes rapidly or unpredictably. A Fund's investments are subject to changes in general economic conditions, general market fluctuations and the risks inherent in investment in securities markets. Investment markets can be volatile, and prices of investments can change substantially due to various factors, including, but not limited to, economic growth or recession, changes in interest rates, inflation, changes in actual or perceived creditworthiness of issuers and general market liquidity. Even if general economic conditions do not change, the value of an investment in a Fund could decline if the particular industries, sectors or companies in which the Fund invests do not perform well or are adversely affected by events. Further, legal, political, regulatory and tax changes also may cause fluctuations in markets and securities prices. Local, regional or global events such as war, military conflicts, acts of terrorism, trade policy changes or disputes, the threat of or actual imposition of tariffs, natural disasters, public health issues, or other events could have a significant impact on a Fund and its investments. Due to the interconnectedness of economies and financial markets throughout the world, if a Fund invests in securities of issuers located in or with significant exposure to countries experiencing economic and financial difficulties, the value and liquidity of the Fund's investments may be negatively affected. A widespread outbreak of an infectious illness and

efforts to contain its spread, may result in market volatility, inflation, reduced liquidity of certain instruments, disruption in the trading of certain instruments, and systemic economic weakness. The foregoing could impact a Fund and its investments and result in disruptions to the services provided to a Fund by its service providers.

Market Volatility; Government Intervention Risk. Market dislocations and other external events, such as the failures or near failures of significant financial institutions, dislocations in investment or currency markets, corporate or governmental defaults or credit downgrades, or poor collateral performance, may subject a Fund to significant risk of substantial volatility and loss. Governmental and regulatory authorities have taken, and may in the future take, actions to provide or arrange credit supports to financial institutions whose operations have been compromised by credit market dislocations and to restore liquidity and stability to financial systems in their jurisdictions; the implementation of such governmental interventions and their impact on both the markets generally and a Fund's investment program in particular can be uncertain. Governmental and non-governmental issuers may default on, or be forced to restructure, their debts, and other issuers may face difficulties obtaining credit. Defaults or restructurings by governments or others of their debts could have substantial adverse effects on economies, financial markets, and asset valuations around the world. Federal Reserve or other U.S. or non-U.S. governmental or central bank actions, including interest rate increases or contrary actions by different governments, or investor perception that these efforts are not succeeding, could negatively affect financial markets generally as well as the values and liquidity of certain securities.

Master/Feeder Structure Risk. Each Fund pursues its objective by investing substantially all of its assets in another pooled investment vehicle (a “master fund”). The ability of a Fund to meet its investment objective is directly related to the ability of the master fund to meet its investment objective. The ability of a Fund to meet its objective may be adversely affected by the purchase and redemption activities of other investors in the master fund. The ability of a Fund to meet redemption requests will depend on its ability to redeem its interest in the master fund. The Adviser or an affiliate serves as investment adviser to the master fund, leading to potential conflicts of interest. For example, the Adviser or its affiliates will receive fees based on the amount of assets invested in the master fund. Investment by a Fund in the master fund may be beneficial in the management of the master fund, by helping to achieve economies of scale or enhancing cash flows. Due to this and other factors, the Adviser may have an incentive to invest a Fund's assets in a master fund sponsored or managed by the Adviser or its affiliates in lieu of investments by a Fund directly in portfolio securities, or may have an incentive to invest in such master fund over a master fund sponsored or managed by others. Similarly, the Adviser may have an incentive to delay or decide against the sale of interests held by a Fund in a master fund sponsored or managed by the Adviser or its affiliates. It is possible that other clients of the Adviser or its affiliates will purchase or sell interests in a master fund sponsored or managed by the Adviser or its affiliates at prices and at times more favorable than those at which a Fund does so. A Fund will bear its pro rata portion of the expenses incurred by the master fund.

Mortgage-Related and Other Asset-Backed Securities Risk (principal risk for the Aggregate Bond Index Fund). Investments in mortgage-related and other asset-backed securities are subject to the risk of significant credit downgrades, illiquidity, and defaults to a greater extent than many other types of fixed income investments. The liquidity of mortgage-related and asset-backed securities may change over time. Mortgage-related securities represent a participation in, or are secured by, mortgage loans. Other asset-backed securities are typically structured like mortgage-related securities, but instead of mortgage loans or interests in mortgage loans, the underlying assets may include, for example, items such as motor vehicle installment sales or installment loan contracts, leases on various types of real and personal property, and receivables from credit card agreements. During periods of falling interest rates, mortgage-related and other asset-backed securities, which typically provide the issuer with the right to prepay the security prior to maturity, may be prepaid, which may result in a Fund having to reinvest the proceeds in other investments at lower interest rates. During periods of rising interest rates, the average life of mortgage-related and other asset-backed securities may extend because of slower-than expected principal payments. This may lock in a below market interest rate, increase the security's duration and interest rate sensitivity, and reduce the value of the security. As a result, mortgage-related and other asset-backed securities may have less potential for capital appreciation during periods of declining interest rates than other debt securities of comparable maturities, although they may have a similar risk of decline in market values during periods of rising interest rates. Prepayment rates are difficult to predict and the potential impact of prepayments on the value of a mortgage-related or other asset-backed security depends on the terms of the instrument and can result in significant volatility. The price of a mortgage-related or other asset-backed security also depends on the credit quality and adequacy of the underlying assets or collateral. Mortgage-related or other asset-backed securities issued by non-governmental issuers (such as commercial banks, savings and loan institutions, private mortgage insurance companies, mortgage bankers and other secondary market issuers) will generally entail greater credit risk than obligations guaranteed by the U.S. government. Defaults on the underlying assets, if any, may impair the value of a mortgage-related or other asset-backed security. For some asset-backed securities in which a Fund invests, such as those backed by credit

card receivables, the underlying cash flows may not be supported by a security interest in a related asset. Moreover, the values of mortgage-related and other asset-backed securities may be substantially dependent on the servicing of the underlying asset pools, and are therefore subject to risks associated with the negligence or malfeasance by their servicers and to the credit risk of their servicers. In certain situations, the mishandling of related documentation may also affect the rights of securities holders in and to the underlying collateral. There may be legal and practical limitations on the enforceability of any security interest granted with respect to underlying assets, or the value of the underlying assets, if any, may be insufficient if the issuer defaults.

In a “forward roll” transaction, a Fund will sell a mortgage-related security to a bank or other permitted entity and simultaneously agree to purchase a similar security from the institution at a later date at an agreed upon price. The mortgage securities that are purchased will bear the same interest rate as those sold, but generally will be collateralized by different pools of mortgages with different prepayment histories than those sold. The values of such transactions will be affected by many of the same factors that affect the values of mortgage-related securities generally. In addition, forward roll transactions may have the effect of creating investment leverage in a Fund.

Non-U.S. Securities Risk (principal risk for the Global All Cap Equity ex-U.S. Index Fund). Investments in securities of non-U.S. issuers (including depositary receipts) entail risks not typically associated with investing in securities of U.S. issuers. Similar risks may apply to securities traded on a U.S. securities exchange that are issued by entities with significant exposure to non-U.S. countries. In certain countries, legal remedies available to investors may be more limited than those available with regard to U.S. investments. Because non-U.S. securities are typically denominated and traded in currencies other than the U.S. dollar, the value of the Fund's assets, to the extent they are non-U.S. dollar denominated, may be affected favorably or unfavorably by currency exchange rates, exchange control regulations, and restrictions or prohibitions on the repatriation of non-U.S. currencies. Income and gains with respect to investments in certain countries may be subject to withholding and other taxes. There may be less information publicly available about a non-U.S. entity than about a U.S. entity, and many non-U.S. entities are not subject to accounting, auditing, and financial reporting standards, regulatory framework and practices comparable to those in the United States. The securities of some non-U.S. entities are less liquid and at times more volatile than securities of comparable U.S. entities, and could become subject to sanctions or embargoes that adversely affect a Fund's investment. Non-U.S. transaction costs, such as brokerage commissions and custody costs may be higher than in the U.S. In addition, there may be a possibility of nationalization or expropriation of assets, imposition of currency exchange controls, confiscatory taxation, and diplomatic developments that could adversely affect the values of a Fund's investments in certain non-U.S. countries. Investments in securities of non-U.S. issuers also are subject to foreign political and economic risk not associated with U.S. investments, meaning that political events (civil unrest, national elections, changes in political conditions and foreign relations, imposition of exchange controls and repatriation restrictions), social and economic events (labor strikes, rising inflation) and natural disasters occurring in a country where a Fund invests could cause the Fund's investments to experience gains or losses. In addition, the threat of or actual imposition of tariffs may adversely impact the price of non-U.S. securities.

Reinvestment Risk (principal risk for the Aggregate Bond Index Fund). Income from a Fund's portfolio may decline when the Fund invests the proceeds from investment income, sales of portfolio securities or matured, traded or called debt obligations. For instance, during periods of declining interest rates, an issuer of debt obligations may exercise an option to redeem securities prior to maturity, forcing a Fund to reinvest the proceeds in lower-yielding securities. A decline in income received by a Fund from its investments is likely to have a negative effect on the yield and total return of the Fund Shares.

factors, the Adviser may have an incentive to invest a Fund's assets in a pool sponsored or managed by the Adviser or its affiliates in lieu of investments by the Fund directly in portfolio securities, or may have an incentive to invest in the pool over a pool sponsored or managed by others. Similarly, the Adviser may have an incentive to delay or decide against the sale of interests held by a Fund in a pool sponsored or managed by the Adviser or its affiliates. It is possible that other clients of the Adviser or its affiliates will purchase or sell interests in a pool sponsored or managed by the Adviser or its affiliates at prices and at times more favorable than those at which a Fund does so.

Settlement Risk (principal risk for the Global All Cap Equity ex-U.S. Index Fund). Markets in different countries have different clearance and settlement procedures and in certain markets there have been times when settlements have been unable to keep pace with the volume of transactions. Delays in settlement may increase credit risk to a Fund, limit the ability of a Fund to reinvest the proceeds of a sale of securities, hinder the ability of a Fund to lend its portfolio securities, and potentially subject a Fund to penalties for its failure to deliver to on-purchasers of securities whose delivery to a Fund was delayed. Delays in the settlement of securities purchased by a Fund may limit the ability of a Fund to sell those securities at times and prices it considers desirable, and may subject a Fund to losses and costs due to its own inability to settle with subsequent purchasers of the securities from it. A Fund may be required to borrow monies it had otherwise expected to receive in connection with the settlement of securities sold by it, in order to meet its obligations to others. Limits on the ability of a Fund to purchase or sell securities due to settlement delays could increase any variance between a Fund's performance and that of its benchmark index.

Small-, Mid- and Micro-Capitalization Securities Risk (principal risk for the Global All Cap Equity ex-U.S. Index Fund and Small/Mid Cap Equity Index Fund). The securities of small-, mid- and micro-capitalization companies may be more volatile and may involve more risk than the securities of larger companies. These companies may have limited product lines, markets or financial resources, may lack the competitive strength of larger companies, and may depend on a few key employees. In addition, these companies may have been recently organized and may have little or no track record of success. The securities of smaller companies may trade less frequently and in smaller volumes than more widely held securities. The prices of these securities may fluctuate more sharply than those of other securities, and a Fund may experience some difficulty in establishing or closing out positions in these securities at prevailing market prices. There may be less publicly available information about the issuers of these securities or less market interest in these securities than in the case of larger companies, both of which can cause significant price volatility. Some securities of smaller issuers may be illiquid or may be restricted as to resale. A Fund may be unable to liquidate its positions in such securities at any time, or at a favorable price, in order to meet a Fund's obligations. Returns on investments in securities of small-, mid- and micro-capitalization companies could trail the returns on investments in securities of larger companies.

Special Risk Considerations of Investing in China (principal risk for the Global All Cap Equity ex-U.S. Index Fund). Investing in securities of Chinese issuers, including by investing in A Shares, involves certain risks and considerations not typically associated with investing in securities of U.S. issuers, including, among others, (i) more frequent (and potentially widespread) trading suspensions and U.S. or foreign government interventions or restrictions with respect to Chinese issuers, which could preclude the Fund from making certain investments or result in the Fund selling investments at disadvantageous times and which may also cause reduced liquidity and increased price volatility in such investments, (ii) the nature and extent of intervention by the Chinese government in the Chinese securities markets, whether such intervention will continue and the impact of such intervention or its discontinuation, (iii) the risk of nationalization or expropriation of assets, (iv) the risk that the Chinese government may decide not to continue to support economic reform programs, (v) limitations on the use of brokers, (vi) potentially higher rates of inflation, (vii) the unavailability of consistently-reliable economic data, (viii) the relatively small size and absence of operating history of many Chinese companies, (ix) accounting, auditing and financial reporting standards in China are different from U.S. standards and, therefore, disclosure of certain material information may not be available, (x) greater political, economic, social, legal and tax-related uncertainty, (xi) higher market volatility caused by any potential regional territorial conflicts or natural disasters, (xii) higher dependence on exports and international trade, (xiii) the risk of increased trade tariffs, sanctions, embargoes and other trade limitations, (xiv) restrictions on foreign ownership, and (xv) custody risks associated with investing through programs to access Chinese securities. Significant portions of the Chinese securities markets may become rapidly illiquid, as Chinese issuers have the ability to suspend the trading of their equity securities, and have shown a willingness to exercise that option in response to market volatility and other events. The liquidity of Chinese securities may shrink or disappear suddenly and without warning as a result of adverse economic, market or political events, or adverse investor perceptions, whether or not accurate.

Unconstrained Sector Risk. A Fund may invest a substantial portion of its assets within one or more economic sectors or industries, which may change from time to time. When a Fund focuses its investments in a particular industry or sector, financial, economic, business, and other developments affecting issuers in that industry, market, or economic sector will have a greater effect on the Fund than if it had not focused its assets in that industry, market, or economic sector, which may increase the volatility of the Fund. Any such investment focus may also limit the liquidity of the Fund. In addition, investors may buy or sell substantial amounts of the Fund's shares in response to factors affecting or expected to affect an industry, market, or economic sector in which the Fund focuses its investments, resulting in extreme inflows or outflows of cash into and out of the Fund. Such extreme cash inflows or outflows might affect management of the Fund adversely.

U.S. Government Securities Risk (principal risk for the Aggregate Bond Index Fund). U.S. government securities, such as Treasury bills, notes and bonds and mortgage-backed securities guaranteed by the Government National Mortgage Association (“Ginnie Mae”), are supported by the full faith and credit of the United States; others are supported by the right of the issuer to borrow from the U.S. Treasury; others are supported by the discretionary authority of the U.S. government to purchase the agency's obligations; and still others are supported only by the credit of the issuing agency, instrumentality, or enterprise. Although U.S. government-sponsored enterprises such as the Federal Home Loan Mortgage Corporation (“Freddie Mac”) and the Federal National Mortgage Association (“Fannie Mae”) may be chartered or sponsored by Congress, they are not funded by Congressional appropriations, and their securities are not issued by the U.S. Treasury nor supported by the full faith and credit of the U.S. government. There is no assurance that the U.S. government would provide financial support to its agencies and instrumentalities if not required to do so. In addition, certain governmental entities have been subject to regulatory scrutiny regarding their accounting policies and practices and other concerns that may result in legislation, changes in regulatory oversight and/or other consequences that could adversely affect the credit quality, availability, or investment character of securities issued by these entities. The value and liquidity of U.S. government securities may be affected adversely by changes in the ratings of those securities. Securities issued by the U.S. Treasury historically have been considered to present minimal credit risk. The downgrade in the long-term U.S. credit rating by at least two major rating agencies has introduced greater uncertainty about the ability of the U.S. to repay its obligations. Further credit rating downgrades or a U.S. credit default could decrease the value and increase the volatility of a Fund's investments.

Valuation Risk (principal risk for the Aggregate Bond Index Fund, Global All Cap Equity ex-U.S. Index Fund and Small/Mid Cap Equity Index Fund). Certain portfolio holdings may be valued on the basis of factors other than market quotations. This may occur more often in times of market turmoil or reduced liquidity. There are multiple methods that can be used to value a portfolio holding when market quotations are not readily available. The value established for any portfolio holding at a point in time might differ from what would be produced using a different methodology or if it had been priced using market quotations. Portfolio holdings that are valued using techniques other than market quotations, including “fair valued” securities, may be subject to greater fluctuation in their valuations from one day to the next than if market quotations were used. Technological issues or other service disruption issues involving third-party service providers may cause a Fund to value its investments incorrectly. In addition, there is no assurance that a Fund could sell or close out a portfolio position for the value established for it at any time, and it is possible that a Fund would incur a loss because a portfolio position is sold or closed out at a discount to the valuation established by a Fund at that time. Investors who purchase or redeem Fund Shares on days when the Fund is holding fair-valued investments may receive fewer or more shares or lower or higher redemption proceeds than they would have received if the Fund had not fair-valued the holding(s) or had used a different valuation methodology.

When-Issued, TBA and Delayed Delivery Securities Risk (principal risk for the Aggregate Bond Index Fund). A Fund may purchase securities on a when-issued, TBA or delayed delivery basis and may purchase securities on a forward commitment basis. The purchase price of the securities is typically fixed at the time of the commitment, but delivery and payment can take place a month or more after the date of the commitment. The prices of the securities so purchased or sold are subject to market fluctuations. At the time of delivery of the securities, the value may be more or less than the purchase or sale price. Purchase of securities on a when-issued, TBA, delayed delivery, or forward commitment basis may give rise to investment leverage, and may result in increased volatility of a Fund's net asset value. Default by, or bankruptcy of, a counterparty to a when-issued, TBA or delayed delivery transaction would expose a Fund to possible losses because of an adverse market action, expenses or delays in connection with the purchase or sale of the pools specified in such transaction. The Financial Industry Regulatory Authority, Inc. (“FINRA”) imposes mandatory margin requirements for certain types of when-issued, delayed delivery or forward commitment transactions (including TBA transactions), with limited exceptions. Such transactions require mandatory collateralization which may increase the cost of such transactions and impose added operational complexity.

Additional Information About Non-Principal Investment Strategies and Risks

Conflicts of Interest Risk. An investment in a Fund will be subject to a number of actual or potential conflicts of interest. For example, the Adviser or its affiliates may provide services to a Fund, such as securities lending agency services, custodial, administrative, bookkeeping, and accounting services, transfer agency and shareholder servicing, securities brokerage services, and other services for which the Fund would compensate the Adviser and/or such affiliates. The Funds may invest in other pooled investment vehicles sponsored, managed, or otherwise affiliated with the Adviser. There is no assurance that the rates at which a Fund pays fees or expenses to the Adviser or its affiliates, or the terms on which it enters into transactions with the Adviser or its affiliates will be the most favorable available in the market generally or as favorable as the rates the Adviser or its affiliates make available to other clients. Because of its financial interest, the Adviser will have an incentive to enter into transactions or arrangements on behalf of a Fund with itself or its affiliates in circumstances where it might not have done so in the absence of that interest, provided that the Adviser will comply with applicable regulatory requirements.

The Adviser and its affiliates serve as investment adviser to other clients and may make investment decisions that may be different from those that will be made by the Adviser on behalf of the Funds. For example, the Adviser may provide asset allocation advice to some clients that may include a recommendation to invest in or redeem from particular issuers while not providing that same recommendation to all clients invested in the same or similar issuers. The Adviser may (subject to applicable law) be simultaneously seeking to purchase (or sell) investments for a Fund and to sell (or purchase) the same investment for accounts, funds, or structured products for which it serves as asset manager, or for other clients or affiliates. The Adviser and its affiliates may invest for clients in various securities that are senior, pari passu or junior to, or have interests different from or adverse to, the securities that are owned by a Fund. The Adviser or its affiliates, in connection with its other business activities, may acquire material nonpublic confidential information that may restrict the Adviser from purchasing securities or selling securities for itself or its clients (including the Funds) or otherwise using such information for the benefit of its clients or itself.

The foregoing does not purport to be a comprehensive list or complete explanation of all potential conflicts of interests which may affect a Fund. A Fund may encounter circumstances, or enter into transactions, in which conflicts of interest that are not listed or discussed above may arise.

Cybersecurity Risk. With the increased use of technologies such as the Internet and the dependence on computer systems to perform business and operational functions, funds (such as the Funds and Portfolios) and their service providers (including the Adviser) may be prone to operational and information security risks resulting from cyber-attacks and/or technological malfunctions. Furthermore, geopolitical tensions may have increased the scale and sophistication of deliberate cybersecurity attacks, particularly those from nation-states or from entities with nation-state backing. In general, cyber-attacks are deliberate, but unintentional events may have similar effects. Cyber-attacks include, among others, stealing or corrupting data maintained online or digitally, preventing legitimate users from accessing information or services on a website, releasing confidential information without authorization, and causing operational disruption. Successful cyber-attacks against, or security breakdowns of, a Fund, a Portfolio, the Adviser or a custodian, transfer agent, or other affiliated or third-party service provider may adversely affect a Fund or its shareholders. For instance, cyber-attacks or technical malfunctions may interfere with the processing of shareholder or other transactions, affect a Fund's ability to calculate its NAV, cause the release of private shareholder information or confidential Fund information, impede trading, cause reputational damage, and subject a Fund to regulatory fines, penalties or financial losses, reimbursement or other compensation costs, and additional compliance costs. Cyber-attacks or technical malfunctions may render records of Fund assets and transactions, shareholder ownership of Fund Shares, and other data integral to the functioning of a Fund inaccessible or inaccurate or incomplete. A Fund may also incur substantial costs for cybersecurity risk management in order to prevent cyber incidents in the future. A Fund and its shareholders could be negatively impacted as a result. While the Adviser has established business continuity plans and systems designed to minimize the risk of cyber-attacks through the use of technology, processes and controls, there are inherent limitations in such plans and systems, including the possibility that certain risks have not been identified, given the evolving nature of this threat. The use of artificial intelligence (“AI”) and machine learning could exacerbate these risks or result in cyber security incidents that implicate personal data. Each Fund relies on third-party service providers for many of its day-to-day operations, and will be subject to the risk that the protections and protocols implemented by those service providers will be ineffective to protect the Fund from cyber-attack. The Adviser does not control the cybersecurity plans and systems put in place by third-

party service providers, and such third-party service providers may have limited indemnification obligations to the Adviser or the Funds. Similar types of cybersecurity risks or technical malfunctions also are present for issuers of securities in which each Fund invests, which could result in material adverse consequences for such issuers, and may cause a Fund's investment in such securities to lose value.

Index Construction Risk. A security included in an Index may not exhibit the characteristic or provide the specific exposure for which it was selected and consequently a Fund's holdings may not exhibit returns consistent with that characteristic or exposure.

Index Licensing Risk. It is possible that the license under which the Adviser or a Fund is permitted to replicate or otherwise use an Index will be terminated or may be disputed, impaired or cease to remain in effect. In such a case, the Adviser may be required to replace the Index with another index which it considers to be appropriate in light of the investment strategy of a Fund. The use of any such substitute index may have an adverse impact on a Fund's performance. In the event that the Adviser is unable to identify a suitable replacement for the Index, it may determine to terminate a Fund.

Money Market Fund Investment Risk. An investment in a money market fund is not a deposit of any bank and is not insured or guaranteed by the FDIC or any other government agency. Certain money market funds seek to preserve the value of their shares at $1.00 per share, although there can be no assurance that they will do so, and it is possible to lose money by investing in such a money market fund. A major or unexpected change in interest rates or a decline in the credit quality of an issuer or entity providing credit support, an inactive trading market for money market instruments, or adverse market, economic, industry, political, regulatory, geopolitical, and other conditions could cause the share price of such a money market fund to fall below $1.00. It is possible that such a money market fund will issue and redeem shares at $1.00 per share at times when the fair value of the money market fund's portfolio per share is more or less than $1.00. The SEC has adopted amendments to money market fund regulation that, among other things, increase the daily and weekly liquid asset requirements. Such amendments may limit the Funds' investment flexibility and reduce its ability to generate returns. A money market fund may be permitted to impose redemption fees during periods of high illiquidity in the markets for the investments held by it. None of State Street Corporation, State Street Bank and Trust Company (“State Street”), State Street Global Advisors, Inc. (“SSGA”), SSGA FM or their affiliates (collectively, the “State Street Entities”) guarantee the value of an investment in a money market fund at $1.00 per share. Investors should have no expectation of capital support to a money market fund from the State Street Entities. Other money market funds price and transact at a “floating” NAV that will fluctuate along with changes in the market-based value of fund assets. Shares sold utilizing a floating NAV may be worth more or less than their original purchase price. Recent changes in the regulation of money market funds may affect the operations and structures of money market funds. A money market fund may be permitted or required to impose redemption fees during times of market stress.

Portfolio Turnover Risk. A Fund may engage in frequent trading of its portfolio securities. Fund turnover generally involves a number of direct and indirect costs and expenses to a Fund, including, for example, brokerage commissions, dealer mark-ups and bid/asked spreads, and transaction costs on the sale of securities and reinvestment in other securities. The costs related to increased portfolio turnover have the effect of reducing a Fund's investment return, and the sale of securities by a Fund may result in the realization of taxable capital gains, including short-term capital gains, which are taxed to individuals as ordinary income.

Securities Lending Risk. Each Fund may lend portfolio securities in an amount not to exceed 40% of the value of its net assets. For these purposes, net assets shall exclude the value of all assets received as collateral for the loan. Such loans may be terminated at any time. Any such loans must be continuously secured by collateral (either cash or other obligations as may be permitted under the Funds' securities lending program) maintained on a current basis in an amount at least equal to the market value of the securities loaned by a Fund, marked to market each trading day. A Fund will receive the amount of all dividends, interest and other distributions on the loaned securities; however, the borrower has the right to vote the loaned securities. A Fund will call loans to vote proxies if a material issue affecting the investment is to be voted upon. Efforts to recall such securities promptly may be unsuccessful, especially for foreign securities or thinly traded securities. Securities lending involves the risk that the Fund may lose money because the borrower of the loaned securities fails to return the securities in a timely manner or at all. Should the borrower of the securities fail financially, a Fund may experience delays in recovering the securities or exercising its rights in the collateral. Loans are made only to borrowers that are deemed by the securities lending agent to be of good financial standing. In a loan transaction, a Fund will also bear the risk of any decline in value of securities acquired with cash collateral. Each Fund expects to invest cash collateral in a pooled investment vehicle advised by the Adviser (e.g., a mutual fund or exchange-traded fund). With

respect to index funds, to the extent the collateral provided or investments made with cash collateral differ from securities included in the relevant Index, such collateral or investments may have a greater risk of loss than the securities included in the Index. In addition, a Fund will be subject to the risk that any income generated by reinvesting cash collateral is lower than any fees the Fund has agreed to pay a borrower.

Portfolio Holdings Disclosure

The Funds' portfolio holdings disclosure policy is described in the Statement of Additional Information (“SAI”).

Management and Organization

Each Fund is a separate, diversified series of the State Street Institutional Investment Trust (the “Trust”), which is an open-end management investment company organized as a business trust under the laws of the Commonwealth of Massachusetts.

Each Fund invests as part of a “master/feeder” structure. Each Fund currently seeks to achieve its investment objective by investing substantially all of its investable assets in a corresponding Portfolio, a separate mutual fund, that has substantially identical investment objective, investment policies, and risks as the Fund. All discussions about a Fund's investment objective, policies and risks should be understood to refer also to the investment objectives, policies and risks of the corresponding Portfolio.

Each Portfolio's shares are offered exclusively to investors (including without limitation, registered investment companies, private investment pools, bank collective funds, and investment separate accounts) that, like the Fund, pay fees to SSGA FM or its affiliates. The fees paid by those investment vehicles to SSGA FM (or its affiliates) vary depending on a number of factors, including by way of example, the services provided, the risks borne by SSGA FM (or its affiliates), fee rates paid by competitive investment vehicles, and in some cases direct negotiation with investors in the Portfolio.

A Fund can withdraw its investment in a Portfolio if, at any time, the Fund's Board of Trustees determines that it would be in the best interests of the Fund's shareholders, or if the investment objectives of the corresponding Portfolio changed so that they were inconsistent with the objectives of the Fund. If a Fund withdraws its investment from a Portfolio, the Fund may invest all of its assets in another mutual fund that has the same investment objective as the Fund, the Adviser may directly manage the Fund's assets, or the Board may take such other action it deems appropriate and in the best interests of shareholders of the Fund, which may include liquidation of the Fund.

Investment Adviser

SSGA FM serves as the investment adviser to each Fund and corresponding Portfolio pursuant to an investment advisory agreement (“Investment Advisory Agreement”) between the Trust and the Adviser, and, subject to the oversight of the Board, is responsible for the investment management of each Fund. The Adviser provides an investment management program for each Fund and manages the investment of each Fund's assets. In addition, the Adviser provides administrative, compliance and general management services to each Fund. The Adviser is a wholly-owned subsidiary of State Street Global Advisors, Inc., which itself is a wholly-owned subsidiary of State Street Corporation. The Adviser is registered with the U.S. Securities and Exchange Commission (“SEC”) under the Investment Advisers Act of 1940, as amended. The Adviser and certain other affiliates of State Street Corporation make up SSGA. SSGA is one of the world's largest institutional money managers and the investment management arm of State Street Corporation. As of December 31, 2024, the Adviser managed approximately $1.11 trillion in assets and SSGA managed approximately $4.72 trillion in assets. The Adviser's principal business address is One Iron Street, Boston, Massachusetts 02210.

Each Fund has entered into an investment advisory agreement with the Adviser, pursuant to which the Adviser will manage the Fund's assets, for compensation paid at an annual rate of 0.025% of the Aggregate Bond Index Fund's average daily net assets, 0.02% of the Equity 500 Index Fund's average daily net assets, 0.06% of the Global All Cap Equity ex-U.S. Index Fund's average daily net assets and 0.03% of the Small/Mid Cap Equity Index Fund's average daily net assets. For the year ended December 31, 2024, Equity 500 Index Fund's effective management fee paid was 0.00%, Aggregate Bond Fund's effective management fee paid was 0.00%, Global All Cap Equity ex-U.S. Index Fund's effective management fee paid was 0.00%, and Small/Mid Cap Equity Index Fund's effective management fee paid was 0.00%, each as a percentage of the Fund's average daily net assets. The Portfolios pay no investment advisory fees to SSGA FM.

Total Annual Fund Operating Expense Waivers. With respect to each Fund or its Portfolio in the table below, SSGA FM is contractually obligated until April 30, 2026 to waive up to the full amount of the management fee payable by a Fund or its Portfolio, and/or to reimburse a Fund or its Portfolio to the extent that total expenses (exclusive of non-recurring account fees, interest, taxes, extraordinary expenses, and distribution, shareholder servicing and sub-transfer agency fees) exceed the following percentage of average daily net assets on an annual basis of a Fund or its Portfolio:

Fund/Portfolio	Expense Limitation
State Street Aggregate Bond Index Fund	0.025%
State Street Aggregate Bond Index Portfolio	0.025%
State Street Equity 500 Index Fund	0.02%
State Street Equity 500 Index II Portfolio	0.02%
State Street Global All Cap Equity ex-U.S. Index Portfolio	0.08%
State Street Small/Mid Cap Equity Index Fund	0.045%
State Street Small/Mid Cap Equity Index Portfolio	0.03%

With respect to State Street Global All Cap Equity ex-U.S. Fund, SSGA FM is contractually obligated until April 30, 2026 to waive up to the full amount of the management fee payable by the Fund, and/or to reimburse the Fund for expenses to the extent that total expenses (exclusive of non-recurring accounting fees, interest, taxes, extraordinary expenses, acquired fund fees and expenses, and any class-specific expenses, such as distribution, shareholder servicing, sub-transfer agency and administration fees) exceed 0.015% of average daily net assets on an annual basis.

The expense limitation for each Fund is inclusive of the allocation of expenses from its respective Portfolio. The waiver and/or reimbursement for each Fund may not be terminated prior to April 30, 2026 except with the approval of the Board.

A discussion regarding the Board's consideration of the Funds' Investment Advisory Agreement is provided in the Funds' Form N-CSR filing with the SEC for the period ended June 30, 2024.

Portfolio Management

The Adviser manages the Funds and the Portfolios using a team of investment professionals. The team approach is used to create an environment that encourages the flow of investment ideas. The portfolio managers within the team work together in a cohesive manner to develop and enhance techniques that drive the investment process for the respective investment strategy. This approach requires portfolio managers to share a variety of responsibilities, including investment strategy and analysis, while retaining responsibility for the implementation of the strategy within any particular portfolio. The approach also enables the team to draw upon the resources of other groups within SSGA. Each portfolio management team is overseen by SSGA's internal governance.

The table below identifies the professionals primarily responsible for the day-to-day management of each Fund and Portfolio:

Portfolio Managers	Portfolios and Funds
Karl Schneider and Amy Scofield	Equity 500 Index Fund and Equity 500 Index II Portfolio
Marc DiCosimo, Joanna Madden and Michael Przygoda	Aggregate Bond Index Fund and Aggregate Bond Index Portfolio
Karl Schneider and Olga Winner	Global All Cap Equity ex-U.S. Index Fund and Global All Cap Equity ex-U.S. Index Portfolio
Karl Schneider and Ted Janowsky	Small/Mid Cap Equity Index Fund and Small/Mid Cap Equity Index Portfolio

Marc DiCosimo, CFA, is a Vice President of SSGA and the Adviser and a Senior Portfolio Manager in the Fixed Income Beta Solutions Group within the Fixed Income, Cash and Currency Team. Prior to joining SSGA in 2013, Mr. DiCosimo worked at Wellington Management as a fixed income portfolio analyst on the Mortgage Backed Securities Team. Mr. DiCosimo has twenty years of fixed income experience working at Loomis Sayles and Saxon Mortgage Capital. Mr. DiCosimo graduated from the University of Richmond with a degree in Accounting. He is a Chartered Financial Analyst (CFA) and is a member of the CFA Institute and CFA Society Boston, Inc. He is a co-chair of the Mortgage Securitization Council of the Association of Institutional Investors.

Ted Janowsky, CFA, is a Vice President of SSGA and the Adviser and a Senior Portfolio Manager in the Systematic Equity Group. In this capacity, he manages a diverse group of equity and derivative-based index portfolios and has played a significant role designing proprietary portfolio management software. Additionally, Mr. Janowsky was head of the portfolio management team of SSGA's Company Stock Group, which manages all fiduciary transactions and company stock investments including employee stock ownership plans, 401(k) plans, defined benefit plans and non-qualified plans. Prior to joining the Systematic Equity Group, he worked as an application developer in Investor Technology Services within State Street Corporation. He also worked as a business analyst in State Street's London and Sydney offices. Mr. Janowsky joined SSGA in 2005. Mr. Janowsky holds a Bachelor of Science in Business Administration from Bucknell University and a Master of Business Administration from the Carroll School of Management at Boston College. He has also earned the Chartered Financial Analyst (CFA) designation and is a member of the CFA Institute and CFA Society Boston, Inc.

Joanna Madden is a Vice President of SSGA and the Adviser and a Portfolio Manager in the Fixed Income Beta Solutions Group since 2013. Previously, Ms. Madden was a portfolio manager in the U.S. Cash Management Group responsible for short-term liquidity investments across all the cash and securities lending portfolios managed in Boston. She joined the Boston group in April 2010 after working as a portfolio manager with the London Cash Management Group. Prior to her portfolio management role, she was a product analyst for the London Cash Management Group where she provided analytical and business support. Before joining SSGA in London, Ms. Madden worked as an operations specialist supporting the Boston Cash Management Group. Ms. Madden received a Bachelor of Science in Political Science from Loyola University of Chicago, Illinois.

Solutions Team and previously managed the Active Fixed Income Operations Team. Mr. Przygoda received his Bachelor of Arts in Finance from Stonehill College and his Master of Science in Finance from Suffolk University. Mr. Przygoda has earned the Chartered Financial Analyst (CFA) designation and is a member of both the CFA Institute and CFA Society Boston, Inc.

Karl Schneider, CAIA, is a Managing Director of SSGA and the Adviser and Co-Head of the Systematic Equity Group in the Americas. He also serves as a Senior Portfolio Manager for a number of the group's index equity portfolios. Previously within the SEG, he was the Deputy Head of the Americas, and prior to that served as a portfolio manager and product specialist for U.S. equity strategies and synthetic beta strategies, including commodities, buy/write, and hedge fund replication. He is a member of the S&P Dow Jones U.S. Equities Index Advisory Panel. Prior to joining the SEG, Mr. Schneider worked as a portfolio manager in SSGA's Currency Management Group, managing both active currency selection and traditional passive hedging overlay portfolios. He joined SSGA in 1997. Mr. Schneider holds a Bachelor of Science in Finance and Investments from Babson College and a Master of Science in Finance from the Carroll School of Management at Boston College. He has earned the Chartered Alternative Investment Analyst (CAIA) designation and is a member of the CAIA Association.

Amy Scofield is a Vice President of SSGA and the Adviser and a Portfolio Manager in the Systematic Equity Group. She is responsible for the management of various equity index funds, with domestic and international strategies. Ms. Scofield rejoined SSGA in November of 2010, after spending two years at Atlantic Trust Company, a private wealth management firm. In her role at Atlantic Trust Company, she specialized in asset allocation and performance analysis for high net worth clients. Prior to Atlantic Trust Company, Ms. Scofield was a compliance officer at SSGA, where she was responsible for ensuring equity portfolios met specified guidelines. She also worked as an operations associate in SSGA's International Structured Products Group. Ms. Scofield holds a Bachelor of Arts in Economics from Boston College.

Olga Winner, CFA, is a Vice President of SSGA and the Adviser and a Senior Portfolio Manager in the Systematic Equity Group. She is responsible for the management of several domestic, international developed and emerging market strategies, including separate accounts, commingled funds, mutual funds and ETFs. Additionally, Ms. Winner manages hedged and futures overlay strategies. Prior to joining SSGA, Ms. Winner worked as an acquisitions associate at Boston Capital Partners, a real estate investment firm, analyzing investment opportunities. She holds a Master of Business Administration and a Master of Science in Finance from the Carroll School of Management at Boston College and a Bachelor of Science in Finance from the University of Massachusetts. She also earned the Chartered Financial Analyst (CFA) designation and is a member of CFA Society Boston, Inc.

Additional information about the portfolio managers' compensation, other accounts managed by the portfolio managers, and the portfolio managers' ownership of the Funds is available in the SAI.

Other Fund Services

The Administrator, Sub-Administrator and Custodian

The Adviser serves as administrator of each Fund. The amount of the fee paid to the Adviser for administrative services may vary by share class. Each Fund currently pays the Adviser an administrative fee at the annual rate of 0.05% with respect to each of its share classes. State Street, a subsidiary of State Street Corporation, serves as sub-administrator for the Funds for a fee that is paid by the Adviser. State Street also serves as custodian of the Funds for a separate fee that is paid by the Funds. SSGA FM serves as administrator of the Portfolios and State Street serves as sub-administrator and custodian of the Portfolios.

The Transfer Agent and Dividend Disbursing Agent

SS&C GIDS, Inc. is the Funds' transfer agent and dividend disbursing agent (the “Transfer Agent”).

The Distributor

State Street Global Advisors Funds Distributors, LLC serves as the Funds' distributor (“SSGA FD”) pursuant to the Distribution Agreement between SSGA FD and the Trust.

Additional Information

The Trustees of the Trust oversee generally the operations of the Funds and the Trust. The Trust enters into contractual arrangements with various parties, including, among others, the Funds' investment adviser, custodian, transfer agent, and accountants, who provide services to the Funds. Shareholders are not parties to any such contractual arrangements or intended beneficiaries of those contractual arrangements, and those contractual arrangements are not intended to create in any shareholder any right to enforce them directly against the service providers or to seek any remedy under them directly against the service providers.

This Prospectus provides information concerning the Trust and the Funds that you should consider in determining whether to purchase shares of the Funds. Neither this Prospectus, nor the related SAI, is intended, or should be read, to be or to give rise to an agreement or contract between the Trust or the Funds and any investor, or to give rise to any rights in any shareholder or other person other than any rights under federal or state law that may not be waived.

Shareholder Information

Determination of Net Asset Value

Each Fund determines its NAV per share once each business day as of the scheduled close of regular trading on the New York Stock Exchange (the “NYSE”). Pricing does not occur on NYSE holidays. A business day is one on which the NYSE is open for regular trading. The Federal Reserve is closed on certain holidays on which the NYSE is open. These holidays are Columbus Day and Veterans Day. On these holidays, you will not be able to purchase shares by wiring Federal Funds because Federal Funds wiring does not occur on days when the Federal Reserve is closed. In unusual circumstances, such as an emergency or an unscheduled close or halt of trading on the NYSE, the time at which share prices are determined may be changed. The NAV per share is based on the market value of the investments held in a Fund. The NAV of each class of a Fund's Shares is calculated by dividing the value of the assets of the Fund attributable to that class less the liabilities of the Fund attributable to that class by the number of shares in the class outstanding. As noted in this Prospectus, each Fund may invest in securities listed on foreign exchanges, or otherwise traded in a foreign market, and those securities may trade on weekends or other days when each Fund does not price its shares. Consequently, the NAV of each Fund's Shares may change on days when shareholders are not able to purchase or redeem the Fund's Shares. Purchase and redemption orders for Fund Shares are processed, respectively, at the NAV next determined after the Fund accepts a purchase order or receives a redemption request in good form. Each Fund values each security or other investment pursuant to guidelines adopted by the Board. The Board has appointed the Adviser as the valuation designee to fair value securities or other investments pursuant to procedures approved by the Funds' Board, under certain limited circumstances. For example, fair value pricing may be used when market quotations are not readily available or reliable, such as when (i) trading for a security is restricted; or (ii) a significant event, as determined by the Adviser, that may affect the value of one or more securities or other investments held by a Fund occurs after the close of a related exchange but before the determination of a Fund's NAV. Attempts to determine the fair value of securities or other investments introduce an element of subjectivity to the pricing of securities or other investments. As a result, the price of a security or other investment determined through fair valuation techniques may differ from the price quoted or published by other sources and may not accurately reflect the price a Fund would have received had it sold the investment. To the extent that a Fund invests in the shares of other registered open-end investment companies that are not traded on an exchange (mutual funds), such shares are valued at their published NAVs per share as reported by the funds. The prospectuses of these funds explain the circumstances under which the funds will use fair value pricing and the effects of using fair value pricing.

Investing in State Street Institutional Investment Trust Shares

any modification or termination of the exchange privileges described in this Prospectus will be preceded by 60 days' advance notice to shareholders. Please call or check online for current information. Requests for transactions in the State Street Funds will be processed when they are received in “good order.” “Good order” means that the request is in an accurate and complete form, and all applicable documents have been received in such accurate and complete form (including, typically, a signed application and medallion-guaranteed documents), and, for a purchase request, the check or wired funds have cleared.

Purchasing Shares

Choosing a Share Class

The Funds offer three classes of shares through this Prospectus: Class A, Class I and Class K, available to you subject to the eligibility requirements set forth below.

All classes of a Fund share the same investment objective and investments, but the different share classes have different expense structures and eligibility requirements. The availability of shares of a particular class through a given Financial Intermediary will depend on the policies and procedures of the Financial Intermediary. The Funds, the Distributor, the Adviser and the Transfer Agent do not provide advice or make recommendations regarding Fund share classes and do not verify that you have invested in the share class most appropriate for your investment needs. You should choose the class with the expense structure that best meets your needs and for which you are eligible. Some factors to consider are the amount you plan to invest, the time period before you expect to sell your shares, whether you might invest more money in the Funds in the future, and the nature of your arrangement with a Financial Intermediary. Your investment professional can help you choose a share class that is appropriate for your investment needs.

When you buy Class A shares, the initial sales load is deducted from the amount you invest, unless you qualify for an initial sales load waiver. This means that less money will be invested in a Fund immediately. Class A shares have a Rule 12b-1 fee of 0.25% per year. A contingent deferred sales charge (“CDSC”) of 1.00% may be assessed on redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1,000,000 or more.

The chart below summarizes the features of the different share classes. This chart is only a general summary, and you should read the description of each Fund's expenses in each Fund Summary in this Prospectus.

Any applicable minimum purchase amount may be waived for specific investors or types of investors, including, without limitation, retirement plans, employees of State Street Corporation and its affiliates and their families. In the case of shareholders purchasing shares through a Financial Intermediary, the minimum purchase amount may be applied at the level of the Financial Intermediary.

	Class A	Class I	Class K
Availability	Available to the general public through certain Financial Intermediaries.	Limited to certain investors serviced through a Financial Intermediary receiving a fee from the applicable Fund for shareholder servicing or similar services.	Limited to certain investors, including certain financial institutions, qualified recordkeepers and employer-sponsored retirement plans.
Minimum Initial Investment	$2,000. The investment minimum may be modified, waived or reduced for certain types of investors (e.g., 401(k) or 403(b) plans) and investments as well as for certain fee-based programs where an agreement is in place.	There is no minimum investment for Class I shares.	There is no minimum investment for Class K shares.

	Class A	Class I	Class K
Maximum Investment	None.	None.	None.
Initial (Front-End) Sales Charge	Yes. 5.25% for Equity Funds and 3.75% for Fixed Income Funds, payable at time of purchase. Lower sales charges are available for larger investments. See the chart under “Class A” section of this Prospectus.	None. Entire purchase price is invested in shares of a Fund.	None. Entire purchase price is invested in shares of a Fund.
Deferred (CDSC) Sales Charge	None, except for purchases of $1,000,000 or more that are redeemed within 18 months after purchase.	None.	None.
Distribution and Service (12b-1) Fees	0.25% annual fee.	None.	None.

The following pages cover additional details about each share class, including information about share class eligibility, initial and deferred sales charges, and sales charge reductions and waivers. Information about sales charges and sales charge reductions and waivers is also available free of charge on the Funds' website at www.ssga.com.

Class A

Class A shares are available to the general public for investment through qualified recordkeepers with a distribution and/or fund servicing agreement maintained with SSGA FD.

When you buy Class A shares, you pay an initial (or front-end) sales charge at the time of your investment, which is included in the offering price, unless you qualify for a sales charge reduction or waiver. This fee is deducted from the amount you invest, and the remainder of your money is used to buy shares in the Fund. The tables below show the amount of sales charge you would pay at different levels of investment and the commissions paid to Financial Intermediaries at each level of investment. The actual sales charge you pay may vary slightly from the rates disclosed due to rounding.

Equity Funds (Equity 500 Index Fund, Global All Cap Equity ex-U.S. Index Fund and Small/Mid Cap Equity Index Fund)

Amount of Purchase Payment	Sales Charge as a % of Offering Price	Sales Charge as a % of Net Amount Invested	Financial Intermediary Compensation as a % of Offering Price
Less than $50,000	5.25%	5.54%	4.75%
$50,000-$99,999	4.50%	4.71%	4.00%
$100,000-$249,999	3.50%	3.63%	3.25%
$250,000-$499,999	2.50%	2.56%	2.25%
$500,000-$999,999	2.00%	2.04%	1.75%
$1,000,000 or more	None	None	Advanced Commission1, 2

Fixed Income Funds (Aggregate Bond Index Fund)

Amount of Purchase Payment	Sales Charge as a % of Offering Price	Sales Charge as a % of Net Amount Invested	Financial Intermediary Compensation as a % of Offering Price
Less than $100,000	3.75%	3.90%	3.25%
$100,000-$249,999	3.25%	3.36%	3.00%
$250,000-$499,999	2.25%	2.30%	2.00%
$500,000-$999,999	1.75%	1.78%	1.50%

Amount of Purchase Payment	Sales Charge as a % of Offering Price	Sales Charge as a % of Net Amount Invested	Financial Intermediary Compensation as a % of Offering Price
$1,000,000 or More	None	None	Advanced Commission1, 2

Class A advanced commission for purchases over $1 million:

1.00%	First $3 million
Plus 0.50%	Next $12 million
Plus 0.25%	Over $15 million

If you purchase $1,000,000 or more of Class A shares of a Fund, you will not be assessed a sales charge at the time of purchase. SSGA FD pays broker-dealers advanced commissions that are calculated on a year-by-year basis based on the amounts invested during that year. Accordingly, with respect to additional purchase amounts, the advanced commission breakpoint resets annually to the first breakpoint on the anniversary of the first purchase. You may be charged a deferred sales charge of 1.00% of the lesser of the original cost of the shares being redeemed or your redemption proceeds if you redeem your shares within 18 months after purchase.

Reducing Your Class A Sales Charge

The Funds offer two principal ways for you to qualify for discounts on initial sales charges on Class A share purchases, often referred to as “breakpoint discounts”: Right of Accumulation or a Letter of Intent. Each of these methods is described below. In taking advantage of these methods for reducing the initial sales charge you will pay, you may link purchases of shares of all of the State Street Funds that offer Class A shares in which you invest (as described below) even if such State Street Funds are held in accounts with different Financial Intermediaries, as well as purchases of Class I and Class N shares of all State Street Funds (other than shares of money market funds) to be held in accounts owned by your spouse or domestic partner and children under the age of 21 who share your residential address. It is your responsibility when investing to inform your Financial Intermediary or the State Street Funds that you would like to have one or more of the State Street Funds linked together for purposes of reducing the initial sales charge.

Right of Accumulation. You may qualify for a reduction in the sales charge you pay for purchases of Class A shares through Right of Accumulation. To calculate the sales charge applicable to your net purchase of Class A shares, you may aggregate your investment calculated as the higher of (a) the current value of your existing holdings or (b) the amount you invested (excluding capital appreciation) less any withdrawals of any Class A, Class I, and Class N shares of a State Street Fund (other than shares of money market funds) held in:

Your account(s);

Account(s) of your spouse or domestic partner;

Account(s) of children under the age of 21 who share your residential address;

Trust accounts established by any of the individuals in items (1) through (3) above. If the person(s) who established the trust is deceased, the trust account may be aggregated with the account(s) of the primary beneficiary of the trust;

Solely controlled business accounts; and

Single-participant retirement plans of any of the individuals in items (1) through (3) above.

In order to obtain any breakpoint reduction in the initial sales charge, you must, before purchasing Class A shares, inform your Financial Intermediary or the State Street Funds if you have any of the above types of accounts that can be aggregated with your current investment in Class A shares to reduce the applicable sales charge. In order to verify your eligibility for a reduced sales charge, you may be required to provide appropriate documentation, such as an account statement or the social security or tax identification number on an account, so that the State Street Funds may verify (1) the number of shares of the State Street Funds held in your account(s) with State Street Funds, (2) the number of shares of the State Street Funds held in your account(s) with a Financial Intermediary, and (3) the number of shares of the State Street Funds held in an account with a Financial Intermediary owned by your spouse or domestic partner and by children under the age of 21 who share your residential address.

Gifting of Shares. If you make a gift of shares, upon your request, you may combine purchases, if made at the same time, under right of accumulation of Class A, Class I and Class N shares of a State Street Fund (other than any shares of money market funds) at the sales charge discount allowed for the combined purchase. The receiver of the gift may also be entitled to a prospective reduction in sales charges in accordance with the Funds' right of accumulation or other provisions. You or the receiver of the gift must provide certain account information to State Street or their agents at the time of purchase to exercise this right.

Letter of Intent. In order to immediately reduce your Class A sales charge, you may sign a Letter of Intent stating your intention to buy a specified amount of Class A shares of one or more State Street Funds within a 13-month period at the reduced sales charge rates applicable to the aggregate amount of the intended purchases stated in the Letter. Purchases of Class A shares of one or more State Street Funds you make over the 13- month period will be combined and you will pay the same sales charge on the new Class A shares that you would have paid if all shares were purchased at once. The 13-month Letter of Intent period commences on the day that the Letter of Intent is received by the Funds or your Financial Intermediary. Purchases submitted not more than three months prior to the date the Letter of Intent is received are considered in determining the level of sales charge that will be paid pursuant to the Letter of Intent; however, the Letter of Intent will not result in any reduction in the amount of any previously paid sales charge. In addition, investors do not receive credit for shares purchased by the reinvestment of distributions.

The Letter of Intent is a non-binding commitment upon the investor to purchase the full amount indicated. Shares worth 5% of the amount of each purchase will be held in escrow (while remaining in your name) until the full amount covered by the Letter of Intent has been invested. If the terms of the Letter of Intent are not fulfilled by the end of the 13th month, you must pay SSGA FD the difference between the sales charges applicable to the purchases at the time they were made and the reduced sales charges previously paid or SSGA FD will liquidate sufficient escrowed shares to obtain the difference. Calculations made to determine whether a Letter of Intent commitment has been fulfilled will be made on the basis of the amount invested prior to the deduction of the applicable sales charge.

To take advantage of the Right of Accumulation and/or a Letter of Intent, complete the appropriate section of your Account Application or contact your Financial Intermediary. To determine if you are eligible for these programs, call (800) 647-7327. These programs may be terminated or amended at any time.

Waiver Of The Class A Sales Charge

A sales charge (“load”) may not be imposed on Class A shares of the Funds if the shares were:

Acquired through the reinvestment of dividends and capital gain distributions.

Acquired in exchange for shares of another Class A State Street Fund that were previously assessed a sales charge. However, if your shares are subject to CDSC, the CDSC will continue to apply to your new shares at the same CDSC rate.

Bought in State Street Funds that do not offer Class N (no load) shares1 by officers, directors or trustees, retirees and employees and their immediate family members (i.e., spouses, domestic partners, children, grandchildren, parents, grandparents, and any dependent of the person, as defined in Section 152 of the Internal Revenue Code of 1986 (the “Code”)) of:

•

The State Street Funds

•

State Street Corporation and its subsidiaries and affiliates

Bought by employees of:

•

SS&C GIDS, Inc. and its subsidiaries and affiliates.

•

Financial Intermediaries of financial institutions that have entered into selling agreements with the Funds or SSGA FD and their subsidiaries and affiliates (or otherwise have an arrangement with a Financial Intermediary or financial institution with respect to sales of Fund Shares). This waiver includes the employees' immediate family members (i.e., spouses, domestic partners, children, grandchildren, parents, grandparents and any dependent of the employee, as defined in Section 152 of the Code).

Bought by:

•

Authorized retirement plans serviced or sponsored by a Financial Intermediary, provided that such Financial Intermediary has entered into an agreement with SSGA FD or with the Fund with respect to such purchases at NAV.

•

Investors who are directly rolling over or transferring shares from an established State Street Fund or State Street qualified retirement plan. Rolling over or transferring shares involves the transferring of shares (in-kind); there is no cash movement associated with the transaction.

State Street Funds that offer Class N Shares include: State Street International Stock Selection Fund (SSAIX) and State Street S&P 500 Index Fund (SVSPX).

•

Clients of Financial Intermediaries that (i) charge an ongoing fee for advisory, management, consulting or similar services, or (ii) have entered into an agreement with SSGA FD to offer Class A shares through a no-load network or platform, or self-directed brokerage accounts that may or may not charge transaction fees to customers.

•

Insurance company separate accounts.

•

Tuition Programs that qualify under Section 529 of the Code.

Bought with proceeds from the sale of Class A shares of a State Street Fund, but only if the purchase is made within 90 days of the sale or distribution. Appropriate documentation may be required. Please refer to Class A Account Reinstatement Privileges below.

Bought in connection with plans of reorganization of a State Street Fund, such as mergers, asset acquisitions and exchange offers to which a Fund is a party. However, you may pay a CDSC when you sell the Fund Shares you received in connection with the plan of reorganization.

Additional Sales Charge Waiver Disclosure

Sales charge waivers are available for eligible purchases of shares made directly though the State Street Funds advised by SSGA FM, and may be available for eligible purchases made through Financial Intermediaries that offer Class A shares on a load-waived basis to you and all similarly situated customers in accordance with the Financial Intermediary's policies and procedures.

Some Financial Intermediaries do not provide all of the sales charge waivers that are available when you purchase shares of the State Street Funds, including sales charge waivers for certain types of accounts, investors, relationships or transactions. Consult your financial advisor to determine which sales charge waivers, if any, you are entitled to receive when purchasing through your Financial Intermediary. You may need to invest directly through another Financial Intermediary in order to take advantage of a specific sales charge waiver offered by a Fund.

Similarly, when purchasing through a Financial Intermediary, your eligibility to receive sales charge waivers and reductions through reinstatement, rights of accumulation and letters of intent depends on the policies and procedures of the Financial Intermediary.

In all instances, it is the purchaser's responsibility to notify SSGA at (800) 647-7327 or the purchaser's Financial Intermediary of any relationship or other facts qualifying the purchaser for sales charge reduction or waivers. Waivers or reductions may be eliminated, modified, and added at any time without providing advance notice to shareholders.

How the CDSC is Calculated

The State Street Funds calculate the CDSC by treating all purchases made in a given month as though they were made on the first day of the month.

The CDSC will be multiplied by then current market value or the original cost of shares being redeemed, whichever is less. To minimize the CDSC, shares not subject to any charge, including share appreciation, or acquired through reinvestment of dividends or capital gain distributions, are redeemed first followed by shares held the longest time.

You should retain any records necessary to substantiate historical costs because SSGA FD, the Funds, the Transfer Agent and your Financial Intermediary may not maintain such information.

Waiver of the CDSC

In the following situations, no CDSC is imposed on redemptions of Class A shares of the Funds:

If you participate in the Automatic Withdrawal Plan. Redemptions made on a regular periodic basis (e.g. monthly) will not be subject to any applicable CDSC if they are, in the aggregate, less than or equal to 10% annually of the current market value of the account balance. Redemptions made as part of a required minimum distribution are also included in calculating amounts eligible for this waiver. For information on the Automatic Withdrawal Plan, please see Service Options.

If you are a registered participant or beneficial owner of an account and you die or become disabled (as defined in Section 72(m)(7) of the Code). This waiver is only available for accounts open prior to the shareholder's or beneficiary's death or disability, and the redemption must be made within one year of such event. Subsequent purchases into such account are not eligible for the CDSC waiver. In order to qualify for this waiver, SSGA FD must be notified of such death or disability at the time of the redemption order and be provided with satisfactory evidence of such death or disability.

Redemptions that represent a required minimum distribution from your IRA Account or other qualifying retirement plan but only if you have reached the age at which you are required by law to receive such distributions. If you maintain more than one IRA, only the assets credited to the IRA that is invested in one or more of the State Street Funds are considered when calculating that portion of your minimum required distribution that qualifies for the waiver.

A distribution from a qualified retirement plan by reason of the participant's retirement.

Redemptions that are involuntary and result from a failure to maintain the required minimum balance in an account.

Exchanges in connection with plans of reorganization of a State Street Fund, such as mergers, asset acquisitions and exchange offers to which a Fund is a party. However, you may pay a sales charge when you redeem the Fund Shares you receive in connection with the plan of reorganization.

Exchanges for shares of the same class of another State Street Fund. However, if your shares are subject to CDSC, the CDSC will continue to apply to your new shares. For purposes of the CDSC, shares will continue to age from the date of the original purchase of the Fund Shares.

Redemption of shares purchased through employer sponsored retirement plans and deferred compensation plans. The CDSC, however, will not be waived if the plan redeems all of the shares that it owns on behalf of participants prior to the applicable CDSC period, as defined above.

Redemptions as part of annual IRA custodial fees.

10.

Acquired through the reinvestment of dividends and capital gains distributions.

Appropriate documentation may be required. Please refer to Class A Account Reinstatement Privileges below.

Class A Account Reinstatement Privileges

You may purchase Class A shares at NAV within 90 days of the sale with no sales charge by reinstating all or part of your proceeds into the same account that the sale or distribution occurred. Any applicable CDSC in connection with the redemption in Class A shares will be credited and aging will begin at original purchase date. Please note that a redemption and reinstatement are considered to be a sale and purchase for tax-reporting purposes.

Class I

Class I shares are not subject to any sales charge. Only certain investors are eligible to buy Class I shares. Your Financial Intermediary can help you determine whether you are eligible to purchase Class I shares.

Class I shares are available to the following categories of investors serviced through a Financial Intermediary receiving a fee from a Fund for shareholder servicing or similar services:

Banks, broker-dealers and other financial institutions (including registered investment advisers and financial planners) that have entered into agreements with the Fund to purchase Class I shares on behalf of their clients in:

•

Discretionary and non-discretionary advisory programs;

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Fund “supermarkets”;

•

Asset allocation programs;

•

Other programs in which the client pays an asset-based fee for advice or for executing transactions in Fund Shares or for otherwise participating in the program; or

•

Certain other investment programs that do not charge an asset-based fee;

Defined contribution, defined benefit and other employer-sponsored employee benefit plans, whether or not qualified under the Code.

There is no minimum investment for Class I shares.

Class K

Class K shares are not subject to any sales charge. Only certain investors are eligible to buy Class K shares. Your Financial Intermediary can help you determine whether you are eligible to purchase Class K shares.

Class K shares are available to the following categories of investors:

Banks, broker-dealers and other financial institutions (including registered investment advisers and financial planners) purchasing Fund Shares on behalf of their clients in:

•

Discretionary and non-discretionary advisory programs;

•

Fund "supermarkets";

•

Asset allocation programs;

•

Other programs in which the client pays an asset-based fee for advice or for executing transactions in Fund Shares or for otherwise participating in the program; or

•

Certain other investment programs that do not charge an asset-based fee;

Qualified recordkeepers with an applicable agreement maintained with SSGA FD;

Endowments and foundations, and defined contribution, defined benefit, and other employer-sponsored employee benefit plans, whether or not qualified under the Code;

Certain other registered open-end investment companies whose shares are distributed by SSGA FD;

Current or retired Directors or Trustees of the State Street Funds, officers and employees of SSGA, and any of its subsidiaries, such persons' spouses, and children under the age of 21, and trust accounts for which any of such person is a beneficiary;

Qualified state tuition plans described in Section 529 of the Code and donor-advised charitable gift funds (subject to all applicable terms and conditions);

Health Savings Accounts under Section 223 of the Code if such accounts are maintained by the Fund at an omnibus level;

Collective investment trusts.

There is no minimum investment for Class K shares.

How to Initiate a Purchase Request

Investing in the State Street Funds Through a Financial Intermediary

If you currently do not have an account with State Street Funds, you may establish a new account and purchase shares through a Financial Intermediary, such as a bank, broker, or investment adviser. Please consult your Financial Intermediary to determine which, if any, shares are available through that firm and to learn about other rules that may apply. You may also submit a New Account Application. To open certain types of accounts, such as IRAs, you will be required to submit an account-specific application. If you intend to add certain investor services offered by the State Street Funds, such as Automatic Investment and Withdrawals Plans, you also will be required to submit a Service Option Form. See Service Options. If you are opening an account through a Financial Intermediary, such as a bank or broker, the Financial Intermediary should have the documents that you will need.

Account Applications and Other Documents. You may find many of the forms necessary to open an account online or by calling or writing to the State Street Funds. See Contacting the State Street Funds.

Opening Accounts and Purchasing By Telephone. You may call the State Street Funds to request that the account-opening forms be sent to you or for assistance in completing the necessary paperwork. Once an account has been established, you may also call the State Street Funds to request a purchase of shares. See Contacting the State Street Funds.

Opening Accounts and Purchasing By Mail. You may send the State Street Funds your account registration form and check to open a new account. To add to an existing account, you may send your check with a written request. You also may send a written request to the State Street Funds to make an exchange. For the State Street Funds' addresses, see Contacting the State Street Funds.

Please be sure to check Exchanging Shares and Frequent-Trading Limits below.

How to Pay for a Purchase

By Wire. Please call the State Street Funds for instructions and policies on purchasing shares by wire. See Contacting the State Street Funds. All wires should be in U.S. dollars and immediately available funds.

By Check. You may send a check to make initial or additional purchases to your fund account. Make your check payable to “State Street Funds” and include the appropriate fund name and account number (e.g., “State Street Equity 500 Index Fund—a/c #xxx”) in the memo section of the check.

By Exchange. You may purchase shares of a State Street Fund, provided the Funds' minimum investment is met, using the proceeds from the simultaneous redemption of shares of another State Street Fund of the same class. You may initiate an exchange by telephone, or by mail. See Exchanging Shares below.

In-Kind Purchase of State Street Fund Shares. The State Street Funds, in their sole discretion, may permit you to purchase shares of a State Street Fund (“State Street Fund Shares”) through the exchange of other securities that you own. The market value of any securities exchanged, plus any cash, must be at least $25 million. Please consult your tax adviser regarding in-kind transactions. Please contact the State Street Funds for more information, including additional restrictions. See Contacting the State Street Funds.

Trade Dates-Purchases

The trade date for any purchase request received in good order will depend on the day and time the State Street Funds receive your request, the manner in which you are paying, and the type of fund you are purchasing. Each State Street Fund's NAV is calculated only on business days, that is, those days that the NYSE is open for regular trading. Purchase orders are processed at the NAV next determined after the Fund accepts a purchase order.

For Purchases by Check, Exchange or Wire into all Funds: If the purchase request is received in good order by the State Street Funds on a business day before the close of regular trading on the NYSE (ordinarily 4 p.m., Eastern time), the trade date will be the same day. If the purchase request is received in good order on a business day after the close of regular trading on the NYSE, or on a non-business day, the trade date will be the next business day.

If your purchase request is not in good order, it may be rejected.

For further information about purchase transactions, consult our website at www.ssga.com or see Contacting the State Street Funds.

Other Purchase Policies You Should Know

Check Purchases. All checks used to purchase State Street Fund Shares must be drawn on a U.S. bank and in U.S. dollars. The State Street Funds will not accept any third-party check used for an initial purchase of Fund Shares, or any check drawn on a credit card account for any purpose.

New Accounts. We are required by law to obtain from you certain personal information that we will use to verify your identity. If you do not provide the information, we may not be able to open your account. If we are unable to verify your identity, the State Street Funds reserve the right, without notice, to close your account or take such other steps as we deem reasonable.

Refused or Rejected Purchase Requests. The State Street Funds reserve the right to stop selling Fund Shares or to reject any purchase request at any time and without notice, including purchases requested by exchange from another State Street Fund. This right also includes the right to reject any purchase request because of a history of frequent trading by the investor or because the purchase may negatively affect a Fund's operation or performance.

Purchases Through Pension Plans. If you are purchasing State Street Fund Shares through a pension or other participation plan, you should contact your plan administrator for further information on purchases.

Redeeming Shares

By Telephone. You may call the State Street Funds to request a redemption of shares. See Contacting the State Street Funds.

By Mail. You may send a written request to the State Street Funds to redeem from a Fund account or to make an exchange. See Contacting the State Street Funds.

If you wish to redeem Fund Shares through a Financial Intermediary, please contact that Financial Intermediary directly. Your Financial Intermediary may have different or additional requirements for the processing of redemption orders, or may be closed at times when the Fund is open. Financial Intermediaries may contact SS&C GIDS, Inc. at (877) 332-6207 or via email at nsccresearch@dstsystems.com with questions.

Please be sure to check Exchanging Shares and Frequent-Trading Limits below.

Trade Date-Redemptions

The trade date for any redemption request received in good order will depend on the day and time the State Street Funds receive your request in good order and the manner in which you are redeeming.

Your redemption will be executed using the NAV as calculated on the trade date. NAVs are calculated only on days that the NYSE is open for regular trading (a business day). If the redemption request is received in good order by the State Street Funds on a business day before the close of regular trading on the NYSE (ordinarily 4 p.m., Eastern time), the request will be processed the same day using that day's NAV. If the redemption request is received in good order on a business day after the close of regular trading on the NYSE, or on a non-business day, the request will be processed the next business day.

How to Receive Redemption Proceeds

Regardless of the method the Funds use to make a redemption payment, the Funds typically expect to pay out redemption proceeds on the next business day after a redemption request is received in good order. If you purchased State Street Fund Shares by check or an automatic investment program and you elect to redeem shares within 15 days of the purchase, you may experience delays in receiving redemption proceeds. In this case, the State Street Funds generally will postpone sending redemption proceeds until it can verify that the check or automatic investment program investment has been collected, but in no event will this delay exceed 15 days. There will be no such delay for redemptions following purchases paid by federal funds wire or by bank cashier's check, certified check or treasurer's check. The State Street Funds reserve the right to pay for redeemed shares within seven days after receiving a redemption order if, in the judgment of the Adviser, an earlier payment could adversely affect a Fund. The State Street Funds reserve the right to suspend the right of shareholder redemption or postpone the date of payment for more than seven days to the extent permitted by the 1940 Act.

The Transfer Agent may temporarily delay for more than seven days the disbursement of redemption proceeds from the Fund account of a “Specified Adult” (as defined in Financial Industry Regulatory Authority, Inc. (“FINRA”) Rule 2165) based on a reasonable belief that financial exploitation of the Specified Adult has occurred, is occurring, has been attempted, or will be attempted, subject to certain conditions.

Under normal circumstances, each Fund expects to meet redemption requests by using cash or cash equivalents in its portfolio and/or selling portfolio assets to generate cash. The Funds also may pay redemption proceeds using cash obtained through borrowing arrangements (including under the Funds' line of credit, which is shared across all registered funds advised by SSGA FM (other than money market funds)) that may be available from time to time.

The right of any investor to receive payment with respect to any redemption may be suspended or the payment of the redemption proceeds postponed beyond 7 days in accordance with Section 22(e) of the 1940 Act and the rules thereunder, including during any period in which the NYSE is closed (other than weekends or holidays) or trading on the NYSE is restricted or if an emergency exists as a result of which disposal by a Fund of securities owned by it is not reasonably practicable or it is not reasonably practicable for a Fund fairly to determine the value of its net assets. In addition, the SEC may by order permit suspension of redemptions for the protection of shareholders of a Fund.

A Fund may pay all or a portion of your redemption proceeds by giving you securities (for example, if the Fund reasonably believes that a cash redemption may have a substantial impact on the Fund and its remaining shareholders). A redemption is generally a taxable event for shareholders, regardless of whether the redemption is satisfied in cash or in kind. You may pay transaction costs and/or taxes (including through the realization of taxable gain) to dispose of the securities, and you may receive less for them than the price at which they were valued for purposes of the redemption. In addition, you will be subject to the market risks associated with such securities until such time as you choose to dispose of the security.

During periods of deteriorating or stressed market conditions, when an increased portion of a Fund's portfolio may be comprised of less liquid investments, or during extraordinary or emergency circumstances, a Fund may be more likely to pay redemption proceeds with cash obtained through short-term borrowing arrangements (if available) or by giving you securities.

By Electronic Bank Transfer. You may have the proceeds of a fund redemption sent directly to a designated bank account. To establish the electronic bank transfer option on an account, you must designate a bank account by completing a special form or filling out the appropriate section of your account registration form. After the option is set up on your account, you can redeem shares by electronic bank transfer on a regular schedule (Automatic Withdrawal Plan) or from time to time. Your redemption request can be initiated by telephone, or by mail.

By Wire. When redeeming shares of a State Street Fund, you may instruct the State Street Funds to wire your redemption proceeds ($1,000 minimum) to a previously designated bank account. Shares will be redeemed from the account on the day that the redemption instructions are received in good order. The wire redemption option is not automatic; you must designate a bank account by completing a special form or filling out the appropriate section of your account registration form. The State Street Funds typically do not charge you a fee for wiring redemption proceeds, although it reserves the right to do so. Your bank may charge a fee for receiving a wire. You are encouraged to check with your bank before initiating any transaction.

By Exchange. You may have the proceeds of a State Street Fund redemption invested directly into shares of another State Street Fund of the same class. You may initiate an exchange by telephone, or by mail.

By Check. You may have the proceeds of a State Street Funds redemption paid by check and sent to the address shown on the State Street Funds registration record, provided that the address on the registration record has not changed within thirty (30) days of the redemption request. The State Street Funds will mail you a redemption check, generally payable to all registered account owners.

Other Redemption Policies that You Should Know

Address Changes. If your address of record has been changed within thirty (30) days of the redemption request, the request must be in writing and bear a medallion guarantee.

Significant/Unusual Economic or Market Activity. During periods of significant or unusual economic or market activity, you may encounter delays attempting to give instructions by phone.

Minimum Account Size. If, due to your redemptions or exchanges, your account balance for a Fund falls below a minimum amount set by the Fund (presently, the minimum initial investment of your selected share class), the Fund may choose to redeem the shares in the account and mail you the proceeds. You will receive 60 days' notice that your account will be closed unless an investment is made to increase the account balance to the required minimum. Failure to bring your account balance to the required minimum within the prescribed period may result in the Fund closing your account at the NAV next determined on the day the account is closed, and mailing the proceeds to you at the address shown on the Fund's records.

Exchanging Shares

An exchange occurs when you use the proceeds from the redemption of shares of one State Street Fund to simultaneously purchase shares of a different State Street Fund. Exchanges may be made within the same class (i.e. Class A shares for Class A shares, Class I shares for Class I shares). Class N shares are also exchangeable for other share classes of State Street Funds and would be subject to the conditions for investing in the other class of shares described in the applicable prospectus. The account holding the original shares must be registered in the same name as the account holding the new shares received in the exchange. You may make exchange requests by telephone, or by mail. See Purchasing Shares and Redeeming Shares above.

Exchanges are subject to the terms applicable to the purchases of the Fund into which you are exchanging. Exchange privileges may not be available for all State Street Funds and may be suspended or rejected. Exchanging shares of a State Street Fund for shares of another fund is a taxable event and may result in capital gain or loss. See Tax Considerations below.

If the NYSE is open for regular trading (generally until 4 p.m. Eastern time, on a business day) at the time an exchange request is received in good order, the trade date generally will be the same day. Please note that the State Street Funds reserve the right to revise or terminate the exchange privilege, limit the amount of any exchange, or reject an exchange, at any time, for any reason; provided, that shareholders will be provided 60 days' advance notice of any modification or termination of the exchange privilege.

Share Class Conversions

stances. Class N shares of a State Street Fund may be converted to Class I shares of the same State Street Fund. Not all share classes are available through all Financial Intermediaries. If your shares of a Fund are converted to a different share class of the same Fund, the transaction will be based on the respective NAV of each class as of the trade date of the conversion. Consequently, you may receive fewer shares or more shares than originally owned, depending on that day's NAVs. The total value of the initially held shares, however, will equal the total value of the converted shares at the time of conversion. The conversion of shares of one class of a Fund into shares of another class of the same Fund is not taxable for U.S. federal income tax purposes and no gain or loss will be reported on the transaction. See the applicable prospectus for share class information. Please contact your Financial Intermediary regarding the tax consequences of any conversion and for additional information.

Frequent-Trading Limits

Frequent, short-term trading, abusive trading practices and market timing (together, “Excessive Trading”), often in response to short-term fluctuations in the market, are not knowingly permitted by the State Street Funds. The State Street Funds do not accommodate frequent purchases and redemptions of Fund Shares by Fund shareholders. Excessive Trading into and out of a State Street Fund may harm a Fund's performance by disrupting portfolio management strategies and by increasing expenses. These expenses are borne by all Fund shareholders, including long-term investors who do not generate such costs.

Excessive Trading activity is generally evaluated based on roundtrip transactions in an account. A “roundtrip” transaction is defined generally as a purchase or exchange into a Fund followed, or preceded, by a redemption or exchange out of the same Fund within 30 days. A State Street Fund may, in its discretion, determine to apply a time period other than 30 days in connection with identifying roundtrip transactions. Shareholders with one or more roundtrip transactions may, in the discretion of a State Street Fund, be blocked from making additional purchases or exchanges in any State Street Fund for a period of time. A State Street Fund has discretion to determine that action is not necessary if it determines that a pattern of trading is not abusive or harmful to the affected Fund in a material way. Fund size and/or transaction size may be considered in evaluating any roundtrip transaction.

The Board of Trustees of the State Street Funds has adopted a “Market Timing/Excessive Trading Policy” (the “Policy”) to discourage Excessive Trading. Under the Policy, the State Street Funds reserve the right to reject any exchanges or purchase orders by any shareholder engaging in Excessive Trading activities.

As a means to protect each State Street Fund and its shareholders from Excessive Trading:

•

The State Street Funds' transfer agent compiles, monitors and reports account-level information on omnibus and underlying shareholder/participant activity. Depending on the account type, monitoring will be performed on a daily, monthly, quarterly and/or annual basis;

•

The State Street Funds' distributor has obtained information from each Financial Intermediary holding shares in an omnibus account with the State Street Funds regarding whether the Financial Intermediary has adopted and maintains procedures that are reasonably designed to protect the Funds against harmful short-term trading; and

•

With respect to State Street Funds that invest in securities that trade on foreign markets, pursuant to the State Street Funds' fair valuation procedures, pricing adjustments may be made based on information received from a third-party, multi-factor fair valuation pricing service.

The State Street Funds' distributor has detailed procedures that document the transparency oversight and monitoring processes performed by the State Street Funds' transfer agent.

While the State Street Funds attempt to discourage Excessive Trading, there can be no guarantee that it will be able to identify investors who are engaging in Excessive Trading or limit their trading practices. Additionally, frequent trades of small amounts may not be detected. The State Street Funds recognize that it may not always be able to detect or prevent Excessive Trading or other activity that may disadvantage the Funds or their shareholders.

A State Street Fund shareholder's right to purchase shares through an automatic investment plan or redeem shares in full (or in part through a systematic withdrawal plan) are unaffected by Excessive Trading restrictions.

Service Options

Dividend and Capital Gain Distribution Option

You may set up your State Street Fund account to reinvest any dividend or capital gains distribution that you receive as a Fund shareholder into the same or a different State Street Fund, or have any dividend or capital gain distribution paid by check, by wire or by check to a special payee. No interest will accrue on the amounts represented by the uncashed distribution checks. If you have elected to receive distributions by check, and the postal or other delivery service is unable to deliver the checks because of an incorrect mailing address, or if a distribution check remains uncashed for six months, the uncashed distribution and all future distributions will be reinvested at the then-current NAV of the Fund.

Please refer to Dividends, Distributions and Tax Considerations below for additional information.

Automatic Withdrawal Plan

If your account balance is over $10,000, you may request periodic (monthly, quarterly, semi-annually, or annually) automatic cash withdrawals of $100 or more which can be mailed to you or any person you designate, or sent through ACH to your bank (at your selection). Proceeds from such withdrawals will be transmitted to the bank account you designate two business days after the trade is placed or executed automatically. No interest will accrue on the amounts represented by the uncashed redemption check(s). Ask your financial adviser or Financial Intermediary for details.

Telephone Redemptions and Exchanges

You may set up your State Street Fund account so that if you request over the telephone to redeem State Street Fund Shares, the redemption proceeds will automatically be wired to a designated bank account. You also may set up your account to permit the State Street Funds to act on your telephonic instructions to exchange State Street Funds shares or to establish a systematic exchange plan. You may choose the date, the frequency (monthly, quarterly or annually) of systematic exchanges of your shares in one State Street Fund to another State Street Fund of the same share class.

Automatic Investment Plan

Once the initial investment has been accepted, you may make subsequent investments of $100 or more monthly, quarterly or annually by direct deposit by debiting your bank checking or savings account. Once this option has been established, you may call the State Street Funds to make additional automatic purchases, to change the amount of the existing automatic purchase, or to stop it. Each State Street Fund reserves the right to cancel your automatic investment plan if any correspondence sent by the Fund is returned by the postal or other delivery service as “undeliverable.”

Additional Shareholder Information

Account Transfers

To effect a change in account registration (for example, to add a new joint owner), a shareholder of a State Street Fund may request to open a new account in the same State Street Fund (referred to as a “transfer”). To effect a transfer, the State Street Funds require a completed and signed new account application, including all necessary additional documents required by the form, and a letter of instruction. The letter of instruction must include the name of the State Street Fund and the original account number, and must be signed by all registered owners of the original account and include a medallion guarantee.

Responsibility for Fraud

The State Street Funds will not be responsible for any account losses because of fraud if we reasonably believe that the person transacting business on an account is authorized to do so. Please take precautions to protect yourself from fraud. Keep your account information private, and immediately review any account statements that we provide to you. It is important that you contact the State Street Funds immediately about any transactions or changes to your account that you believe to be unauthorized.

Right to Change Policies

In addition to the rights expressly stated elsewhere in this Prospectus, the State Street Funds reserve the right, in the future, to:

Alter, add, or discontinue any conditions of purchase (including eligibility requirements), redemption, exchange, service, or privilege at any time;

Accept initial purchases by telephone;

Freeze any account and/or suspend account services if the State Street Funds has received reasonable notice of a dispute regarding the assets in an account, including notice of a dispute between the registered or beneficial account owners, or if we reasonably believe a fraudulent transaction may occur or has occurred;

Temporarily freeze any account and/or suspend account services upon initial notification to the State Street Funds of the death of the shareholder until the State Street Funds receive required documentation in good order;

Alter, impose, discontinue, or waive any redemption fee, account service fee, or other fees charged to a group of shareholders; and

Redeem an account or suspend account privileges, without the owner's permission to do so, in cases of threatening conduct or activity the State Street Funds believe to be suspicious, fraudulent, or illegal.

Changes may affect any or all investors. These actions will be taken when, at the sole discretion of the SSGA FM management, we reasonably believe they are deemed to be in the best interest of the State Street Fund.

Unclaimed Property

Many states have unclaimed property rules that provide for transfer to the state (also known as “escheatment”) of unclaimed property under various circumstances. These circumstances include inactivity (e.g., no owner-initiated contact for a certain period), returned mail (e.g., when mail sent to a shareholder is returned by the post office as undeliverable), or a combination of both inactivity and returned mail. If the Funds' transfer agent identifies property as unclaimed, it will attempt to contact the shareholder, but if that attempt is unsuccessful, the account may be considered abandoned and escheated to the state after the passage of a certain period of time (as required by applicable state law).

It is your responsibility to ensure that you maintain a correct address for your account, and maintain contact in ways such as by contacting the Funds' transfer agent by mail or telephone or accessing your account through the Funds' website, and promptly cashing all checks for dividends, capital gains and redemptions. State requirements for maintaining contact with an account can vary and are subject to change. If you invest in a Fund through a financial intermediary, we encourage you to contact the financial intermediary regarding applicable state unclaimed property laws. The Funds, the transfer agent and the distributor will not be liable to shareholders or their representatives for good faith compliance with state unclaimed property laws. Please check your state's unclaimed or abandoned property website for specific information.

If you are a resident of the state of Texas, you may designate a representative to receive escheatment notifications by completing and submitting a designation form, which you can find on the website of the Texas Comptroller. Designating such a representative may be beneficial, since Texas law provides that the escheatment period will cease if the representative, after receiving an escheatment notification regarding your account, communicates knowledge of your location and confirms that you have not abandoned your account. You can mail a completed designation form to a Fund (if you hold shares directly with a Fund) or to your financial intermediary (if you do not hold shares directly with a Fund).

Dividends, Distributions and Tax Considerations

Dividends of investment income and capital gain distributions of the Funds will be declared and paid at least annually. Any investment income and capital gains that have not been distributed by December of each calendar year are generally distributed at such time. When a Fund distributes investment income or capital gains, the NAV per share is reduced by the amount of the distribution.

Distribution Options. You can choose from four different distribution options as indicated on the application:

•

Reinvestment Option—Dividends and capital gain distributions will be automatically reinvested in additional shares of a Fund. If you do not indicate a choice on the application, this option will be automatically assigned.

•

Income-Earned Option—Capital gain distributions will be automatically reinvested, but a check, direct deposit or wire will be sent for each dividend distribution.

•

Cash Option—A check, wire or direct deposit will be sent for each dividend and capital gain distribution.

•

Direct Dividends Option—Dividends and capital gain distributions will be automatically invested in another identically registered State Street Fund of the same share class.

If you have elected to receive distributions by check, and the postal or other delivery service is unable to deliver the checks because of an incorrect mailing address, or if a distribution check remains uncashed for six months, the uncashed distribution and all future distributions will be reinvested at the then-current net asset value of the Fund.

Dividend Policy Upon Purchase. A shareholder will receive a dividend or capital gain distribution only if the shareholder purchased Fund Shares by the close of the record date of such dividend or capital gain distribution.

Delivery of Documents to Accounts Sharing an Address

To reduce expenses, we may mail only one copy of the Funds' Prospectus and each annual and semi-annual report to those addresses shared by two or more accounts. If you wish to receive individual copies of these documents, please call us at (800) 647-7327, or contact your financial institution. We will begin sending you individual copies thirty (30) days after receiving your request.

Tax Considerations

Each Fund invests substantially all of its assets in a corresponding Portfolio that is expected to be treated as a regulated investment company for U.S. federal income tax purposes, and so substantially all of a Fund's income will result from distributions or deemed distributions from the corresponding Portfolio. Therefore, as applicable, and except as otherwise stated, references in this section to the assets owned or income earned by a Fund will include such assets and income of the corresponding Portfolio. Each Fund has elected to be treated as a regulated investment company and intends each year to qualify and to be eligible to be treated as such. A regulated investment company generally is not subject to tax at the corporate level on income and gains that are timely distributed to shareholders. In order to qualify and be eligible for treatment as a regulated investment company, a Fund must, among other things, satisfy diversification, 90% gross income and distribution requirements. A Fund's failure to qualify and be eligible for treatment as a regulated investment company would result in corporate level taxation, and consequently, a reduction in income available for distribution to shareholders.

Each Fund generally expects to satisfy the requirements to qualify and be eligible to be treated as a regulated investment company, provided that the respective Portfolio also meets these requirements; each Fund currently expects that the relevant Portfolio will meet these requirements. Because each Fund will invest substantially all its assets in a Portfolio, if such Portfolio were to fail to satisfy the diversification, 90% gross income, or distribution requirement and were not to cure that failure, the Fund itself would be unable to satisfy the diversification requirement. Such a failure to qualify and be eligible for treatment as a regulated investment company could subject the Fund and/or the Portfolio to regular corporate income taxes.

For U.S. federal income tax purposes, distributions of investment income generally are taxable to you as ordinary income. Taxes on distributions of capital gains generally are determined by how long a Fund or a Portfolio owned (or is deemed to have owned) the investments that generated them, rather than how long you have owned your Fund Shares. Distributions of net capital gains (that is, the excess of net long-term capital gains over net short-term capital losses) from the sale of investments that a Fund or a Portfolio owned (or is deemed to have owned) for more than one year that are properly reported by the Fund, or the Portfolio and the applicable Fund, as capital gain dividends generally will be treated as long-term capital gain includible in your net capital gain and taxed to individuals at reduced rates. Distributions of gains from investments that a Fund or a Portfolio owned (or is deemed to have owned) for one year or less generally will be taxable to you as ordinary income when distributed to you by the Fund. Distributions of investment income properly reported by a Fund, or by a Portfolio and the applicable Fund, as derived from “qualified dividend income,” which will not include income from the Fund's or the Portfolio's portfolio securities on loan, are taxed to individuals at the rates applicable to net capital gain, provided holding period and other requirements are met by the shareholder, the Fund, and if applicable, the Portfolio. Distributions are taxable to you even if they are paid from income or gains earned by a Fund or a Portfolio before your investment (and thus were included in the price you paid for your shares). Distributions may also be subject to state and local taxes and are taxable whether you receive them in cash or reinvest them in additional shares. Distributions in excess of a Fund's current and accumulated earnings and profits are treated as a return of capital to the extent of your basis in the applicable Fund's shares, and, in general, as capital gain thereafter.

Any gain resulting from the redemption or other taxable disposition of Fund Shares generally will also be taxable to you as either short-term or long-term capital gain, depending upon how long you held such Fund Shares.

An additional 3.8% Medicare contribution tax is imposed on the “net investment income” of individuals, estates and trusts to the extent their income exceeds certain threshold amounts. Net investment income generally includes for this purpose dividends paid by a Fund, including any capital gain dividends, and net gains recognized on the redemption (or other taxable disposition) of Fund Shares.

A Fund's or a Portfolio's income from or the proceeds of dispositions of its investments in non-U.S. assets may be subject to non-U.S. withholding or other taxes, which will reduce the yield on those investments. In certain instances, a Fund or a Portfolio and, in turn, a Fund may be entitled to elect to pass through to its shareholders a credit (or deduction, for a shareholder that itemizes deductions and so chooses) for foreign taxes (if any) borne with respect to foreign securities income earned by the Fund or the Portfolio. If the Fund or, as applicable, the Portfolio and the Fund so elect, shareholders will include in gross income from foreign sources their pro rata shares of such taxes, if any, treated as paid by the Fund or the Portfolio. There can be no assurance that a Portfolio and/or a Fund will make such election, even if each is eligible to do so. If a Portfolio or a Fund does not qualify for or does not make such election, shareholders will not be entitled separately to claim a credit or deduction with respect to foreign taxes paid by the Fund or the Portfolio; in that case the foreign tax will nonetheless reduce the Fund's and/or the Portfolio's taxable income. Even if a Portfolio and a Fund elect to pass through to shareholders foreign tax credits or deductions, tax-exempt shareholders and those who invest in the Fund through tax-advantaged accounts such as IRAs will not benefit from any such tax credit or deduction. Under certain circumstances, if a Portfolio or a Fund receives a refund of foreign taxes paid in respect of a prior year, the value of Fund Shares could be affected or any foreign tax credits or deductions passed through to shareholders in respect of the Portfolio's or the Fund's foreign taxes for the current year could be reduced.

Certain of a Fund's or a Portfolio's investment practices, including derivative transactions and investments in debt obligations issued or purchased at a discount, will be subject to special and complex U.S. federal income tax provisions. These special rules may affect the timing, character, and/or amount of a Fund's distributions, or a Portfolio's distributions to a Fund, and, in turn, a Fund's distributions to shareholders, and may require the Fund or the Portfolio to sell its investments at a time when it is not advantageous to do so.

A Fund's investments in a Portfolio may cause the tax treatment of the Fund's gains, losses and distributions to differ from the tax treatment that would apply if the Fund invested directly in the types of securities held by the Portfolio. As a result, investors may receive taxable distributions earlier and recognize higher amounts of capital gain or ordinary income than they otherwise would.

If you are not a U.S. person, dividends paid by a Fund that the Fund properly reports as capital gain dividends, short-term capital gain dividends, or interest-related dividends, each as further defined in the SAI, are not subject to withholding of U.S. federal income tax, provided that certain requirements are met. A Fund is permitted, but is not required, to report any part of its dividends as are eligible for such treatment. A Fund's dividends other than those the Fund so reports as capital gain dividends, short-term capital gain dividends, or interest-related dividends generally will be subject to U.S. withholding tax at a 30% rate (or lower applicable treaty rate). See each Fund's SAI for further information.

The U.S. Treasury and the Internal Revenue Service (the “IRS”) generally require a Fund to obtain information sufficient to identify the status of each shareholder under sections 1471-1474 of the Code, and the U.S. Treasury and IRS guidance issued thereunder (collectively, “FATCA”) or under an applicable intergovernmental agreement between the United States and a foreign government. Please see the SAI for more information on FATCA reporting requirements.

Cost Basis Reporting. U.S. Treasury regulations mandate cost basis reporting to shareholders and the IRS for redemptions of Fund Shares acquired on or after January 1, 2012 (“Post Effective Date Shares”). If you acquire and hold shares directly through the Funds and not through a Financial Intermediary, SS&C GIDS, Inc. will use a default average cost basis methodology for tracking and reporting your cost basis on Post Effective Date Shares, unless you request, in writing, another cost basis reporting methodology.

Financial Intermediary Arrangements

Distribution Arrangements and Rule 12b-1 Fees

net assets) of 0.25% of each Fund's net assets attributable to its Class A shares. Because these fees are paid out of the assets of a Fund attributable to its Class A shares on an ongoing basis, they will increase the cost of your investment and may cost you more over time than paying other types of sales charges.

A Fund may pay distribution fees and other amounts described in this Prospectus at a time when shares of that Fund are unavailable for purchase.

Other Payments to Financial Intermediaries

In addition to payments under the Plan described above, the Funds may reimburse SSGA FD or its affiliates for payments made to Financial Intermediaries that provide certain administrative, recordkeeping, and account maintenance services. The amount of the reimbursement and the manner in which it is calculated are reviewed by the Trustees periodically.

Financial Intermediaries are firms that sell shares of mutual funds, including the Funds, and/or provide certain administrative and account maintenance services to mutual fund investors. Financial Intermediaries may include, among others, brokers, financial planners or advisers, banks, retirement plan recordkeepers and insurance companies.

In some cases, a Financial Intermediary may hold its clients' Fund Shares in nominee or street name and may utilize omnibus accounts. Shareholder services provided by a Financial Intermediary may (though they will not necessarily) include, among other things: establishing and maintaining shareholder account registrations; receiving and processing purchase and redemption orders, including aggregated orders and delivering orders to the Fund's transfer agent; processing and mailing trade confirmations, periodic statements, prospectuses, annual reports, semiannual reports, shareholder notices, and other SEC-required communications; capturing and processing tax data; issuing and mailing dividend checks to shareholders who have selected cash distributions; preparing record date shareholder lists for proxy solicitations; and collecting and posting distributions to shareholder accounts.

The Financial Intermediary is often compensated by SSGA FD or its affiliates for the services it performs and in such cases is typically paid continually over time, during the period when the Financial Intermediary's clients hold investments in the Funds. The amount of continuing compensation paid by SSGA FD or its affiliates to different Financial Intermediaries for distribution and/or shareholder services varies. Any compensation is typically a percentage of the value of the Financial Intermediary's clients' investments in the Funds or a per account fee. The variation in compensation may, but will not necessarily, reflect enhanced or additional services provided by the Financial Intermediary.

If you invest through a Financial Intermediary and meet the eligibility criteria for more than one share class, you should discuss with your Financial Intermediary which share class is appropriate for you. Your financial adviser and the Financial Intermediary employing him or her may have an incentive to recommend one share class over another, when you are eligible to invest in more than one share class. Please speak with your financial adviser to learn more about the total amounts paid to your financial adviser and his or her firm by the Funds or its affiliates with respect to the different share classes offered by the Funds.

SSGA FD and its affiliates (including SSGA FM), at their own expense and out of their own assets, may also provide other compensation to Financial Intermediaries in connection with sales of the Funds' shares or the servicing of shareholders or shareholder accounts. Such compensation may include, but is not limited to, financial assistance to Financial Intermediaries in connection with conferences, sales, or training programs for their employees; seminars for the public; advertising or sales campaigns; or other Financial Intermediary-sponsored special events. In some instances, this compensation may be made available only to certain Financial Intermediaries whose representatives have sold or are expected to sell significant amounts of shares. Dealers may not use sales of the Funds' shares to qualify for this compensation to the extent prohibited by the laws or rules of any state or any self-regulatory agency, such as FINRA.

If payments to Financial Intermediaries by the distributor or adviser for a particular mutual fund complex exceed payments by other mutual fund complexes, your financial adviser and the Financial Intermediary employing him or her may have an incentive to recommend that fund complex over others. Please speak with your financial adviser to learn more about the total amounts paid to your financial adviser and his or her firm by SSGA FD and its affiliates and by sponsors of other mutual funds he or she may recommend to you. You should also consult disclosures made by your Financial Intermediary at the time of purchase.

Third-Party Transactions. The State Street Funds have authorized certain Financial Intermediaries to accept purchase, redemption and exchange orders on the State Street Funds' behalf. Orders received for a State Street Fund by a Financial Intermediary that has been authorized to accept orders on the Fund's behalf (or other Financial Intermediaries designated by the Financial Intermediary) will be deemed accepted by the Fund at the time they are received by the Financial Intermediary and will be priced based on the Fund's next NAV determination as long as the Financial Intermediary transmits the order in good form and in a timely manner to the applicable State Street Fund(s). The State Street Funds will be the sole party to determine if a trade is received in good order. The Financial Intermediary is responsible for transmitting your orders and associated funds in good form and in a timely manner to the applicable State Street Fund(s). The State Street Funds will not be responsible for delays by the Financial Intermediary in transmitting your orders, including timely transfer of payment, to a Fund.

If you are purchasing, selling, exchanging or holding State Street Fund shares through a program of services offered by a Financial Intermediary, you may be required by the Financial Intermediary to pay additional fees. You should contact the Financial Intermediary for information concerning what additional fees, if any, may be charged.

Financial Highlights

The financial highlight tables are intended to help you understand each Fund's financial performance since each Fund's inception. Certain information reflects the performance results for a single Fund Share. The total returns in the table represent the rate that an investor would have earned (or lost) on an investment in each Fund (assuming reinvestment of all dividends and distributions). This information has been audited by Ernst & Young LLP, the Trust's independent registered public accounting firm, whose report, along with each Fund's financial highlights and financial statements, are included in each Fund's Form N-CSR filing, which are available upon request. Any references to Notes in these financial highlight tables refer to the “Notes to Financial Statements” section of each Fund's financial statements, and the financial information included in these tables should be read in conjunction with the financial statements incorporated by reference in the SAI.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET AGGREGATE BOND INDEX FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class A
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20 (a)
Net asset value, beginning of period	$86.99	$85.06	$100.32	$105.53	$101.10
Income (loss) from investment operations:
Net investment income (loss) (b)	2.86	2.37	1.79	1.45	2.18
Net realized and unrealized gain (loss)	(1.99 )	1.91	(15.40 )	(3.79 )	5.10
Total from investment operations	0.87	4.28	(13.61 )	(2.34 )	7.28
Contribution from affiliates	—	—	0.06	—	—
Distributions to shareholders from:
Net investment income	(2.85 )	(2.35 )	(1.70 )	(1.44 )	(2.06 )
Net realized gains	—	(0.00 )(c)	(0.01 )	(1.43 )	(0.79 )
Total distributions	(2.85 )	(2.35 )	(1.71 )	(2.87 )	(2.85 )
Net asset value, end of period	$85.01	$86.99	$85.06	$100.32	$105.53
Total return (d)	1.01 %	5.14 %	(13.57 )%(e)	(2.22 )%	7.25 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$12,375	$14,851	$14,390	$10,742	$11,200
Ratios to Average Net Assets:
Total expenses (f)	0.45 %	0.57 %	0.58 %	0.58 %	0.66 %
Net expenses (f)	0.34 %	0.45 %	0.45 %	0.47 %	0.48 %
Net investment income (loss)	3.32 %	2.78 %	2.01 %	1.41 %	2.08 %
Portfolio turnover rate (g)	16 %	14 %	21 %	21 %	37 %

(a)	After the close of trading on April 17, 2020, the State Street Aggregate Bond Index Fund underwent a 1-for-10 reverse share split. The historical per share activity presented here has been retroactively adjusted to reflect this split.
(b)	Net investment income per share is calculated using the average shares method.
(c)	Amount is less than $0.005 per share.
(d)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(e)	If the Adviser had not made a contribution during the year ended December 31, 2022, the total return would have been (13.63)%.
(f)	Ratio does not include the expenses of the corresponding Portfolio.
(g)	Portfolio turnover rate is from the corresponding Portfolio.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET AGGREGATE BOND INDEX FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class I
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20 (a)
Net asset value, beginning of period	$86.73	$84.81	$100.03	$105.23	$100.80
Income (loss) from investment operations:
Net investment income (loss) (b)	3.11	2.79	1.94	1.69	2.38
Net realized and unrealized gain (loss)	(1.95 )	1.69	(15.29 )	(3.77 )	5.20
Total from investment operations	1.16	4.48	(13.35 )	(2.08 )	7.58
Contribution from affiliates	—	—	0.06	—	—
Distributions to shareholders from:
Net investment income	(3.05 )	(2.56 )	(1.92 )	(1.69 )	(2.36 )
Net realized gains	—	(0.00 )(c)	(0.01 )	(1.43 )	(0.79 )
Total distributions	(3.05 )	(2.56 )	(1.93 )	(3.12 )	(3.15 )
Net asset value, end of period	$84.84	$86.73	$84.81	$100.03	$105.23
Total return (d)	1.35 %	5.40 %	(13.36 )%(e)	(1.97 )%	7.57 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$6,824	$12,588	$6,870	$7,160	$8,073
Ratios to Average Net Assets:
Total expenses (f)	0.16 %	0.32 %	0.33 %	0.33 %	0.41 %
Net expenses (f)	0.05 %	0.20 %	0.20 %	0.22 %	0.23 %
Net investment income (loss)	3.62 %	3.31 %	2.16 %	1.65 %	2.27 %
Portfolio turnover rate (g)	16 %	14 %	21 %	21 %	37 %

(a)	After the close of trading on April 17, 2020, the State Street Aggregate Bond Index Fund underwent a 1-for-10 reverse share split. The historical per share activity presented here has been retroactively adjusted to reflect this split.
(b)	Net investment income per share is calculated using the average shares method.
(c)	Amount is less than $0.005 per share.
(d)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(e)	If the Adviser had not made a contribution during the year ended December 31, 2022, the total return would have been (13.42)%.
(f)	Ratio does not include the expenses of the corresponding Portfolio.
(g)	Portfolio turnover rate is from the corresponding Portfolio.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET AGGREGATE BOND INDEX FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class K
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20 (a)
Net asset value, beginning of period	$86.73	$84.80	$100.01	$105.20	$100.80
Income (loss) from investment operations:
Net investment income (loss) (b)	3.34	2.77	2.13	1.92	2.59
Net realized and unrealized gain (loss)	(2.19 )	1.88	(15.30 )	(3.79 )	5.20
Total from investment operations	1.15	4.65	(13.17 )	(1.87 )	7.79
Contribution from affiliates	—	—	0.06	—	—
Distributions to shareholders from:
Net investment income	(3.18 )	(2.72 )	(2.09 )	(1.89 )	(2.60 )
Net realized gains	—	(0.00 )(c)	(0.01 )	(1.43 )	(0.79 )
Total distributions	(3.18 )	(2.72 )	(2.10 )	(3.32 )	(3.39 )
Net asset value, end of period	$84.70	$86.73	$84.80	$100.01	$105.20
Total return (d)	1.34 %	5.61 %	(13.19 )%(e)	(1.77 )%	7.79 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$1,538,957	$789,581	$588,019	$621,039	$362,294
Ratios to Average Net Assets:
Total expenses (f)	0.12 %	0.12 %	0.13 %	0.13 %	0.21 %
Net expenses (f)	0.00 %(g)	0.00 %(g)	0.00 %(g)	0.02 %	0.03 %
Net investment income (loss)	3.90 %	3.26 %	2.38 %	1.88 %	2.47 %
Portfolio turnover rate (h)	16 %	14 %	21 %	21 %	37 %

(a)	After the close of trading on April 17, 2020, the State Street Aggregate Bond Index Fund underwent a 1-for-10 reverse share split. The historical per share activity presented here has been retroactively adjusted to reflect this split.
(b)	Net investment income per share is calculated using the average shares method.
(c)	Amount is less than $0.005 per share.
(d)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(e)	If the Adviser had not made a contribution during the year ended December 31, 2022, the total return would have been (13.25)%.
(f)	Ratio does not include the expenses of the corresponding Portfolio.
(g)	Amount is less than 0.005%.
(h)	Portfolio turnover rate is from the corresponding Portfolio.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET EQUITY 500 INDEX FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class A Shares
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20 (a)
Net asset value, beginning of period	$356.63	$287.47	$358.82	$286.88	$247.00
Income (loss) from investment operations:
Net investment income (loss) (b)	5.28	3.73	1.67	3.49	3.20
Net realized and unrealized gain (loss)	82.02	70.16	(68.27 )	76.69	40.72
Total from investment operations	87.30	73.89	(66.60 )	80.18	43.92
Contribution from affiliates	—	—	0.13	—	—
Distributions to shareholders from:
Net investment income	(5.14 )	(3.52 )	(1.81 )	(3.29 )	(3.24 )
Net realized gains	—	(1.21 )	(3.07 )	(4.95 )	(0.80 )
Total distributions	(5.14 )	(4.73 )	(4.88 )	(8.24 )	(4.04 )
Net asset value, end of period	$438.79	$356.63	$287.47	$358.82	$286.88
Total return (c)	24.44 %	25.70 %	(18.52 )%(d)	27.94 %	17.79 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$116,590	$91,891	$74,420	$95,176	$67,324
Ratios to Average Net Assets:
Total expenses (e)	0.52 %	0.54 %	0.53 %	0.55 %	0.56 %
Net expenses (e)	0.44 %	0.45 %	0.45 %	0.47 %	0.47 %
Net investment income (loss)	1.30 %	1.16 %	0.54 %	1.07 %	1.29 %
Portfolio turnover rate (f)	4 %	4 %	2 %	6 %	6 %

(a)	On April 17, 2020, the State Street Equity 500 Index Fund underwent a 1-for-10 reverse share split. The per share data presented here have been retroactively adjusted to reflect this split.
(b)	Net investment income per share is calculated using the average shares method.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(d)	If the affiliates had not made contributions during the year ended December 31, 2022, the total return would have been (18.56)%.
(e)	Ratio does not include the expenses of the State Street Equity 500 Index II Portfolio.
(f)	Portfolio turnover rate is from the State Street Equity 500 Index II Portfolio.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET EQUITY 500 INDEX FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class I Shares
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20 (a)
Net asset value, beginning of period	$356.72	$287.54	$358.91	$286.96	$247.10
Income (loss) from investment operations:
Net investment income (loss) (b)	6.96	5.23	2.50	4.85	4.39
Net realized and unrealized gain (loss)	82.00	69.59	(68.38 )	76.26	40.24
Total from investment operations	88.96	74.82	(65.88 )	81.11	44.63
Contribution from affiliates	—	—	0.13	—	—
Distributions to shareholders from:
Net investment income	(6.77 )	(4.43 )	(2.55 )	(4.21 )	(3.97 )
Net realized gains	—	(1.21 )	(3.07 )	(4.95 )	(0.80 )
Total distributions	(6.77 )	(5.64 )	(5.62 )	(9.16 )	(4.77 )
Net asset value, end of period	$438.91	$356.72	$287.54	$358.91	$286.96
Total return (c)	24.89 %	26.02 %	(18.32 )%(d)	28.25 %	18.07 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$60,215	$53,036	$33,286	$38,162	$21,365
Ratios to Average Net Assets:
Total expenses (e)	0.16 %	0.29 %	0.28 %	0.30 %	0.31 %
Net expenses (e)	0.08 %	0.20 %	0.20 %	0.22 %	0.22 %
Net investment income (loss)	1.71 %	1.62 %	0.80 %	1.47 %	1.75 %
Portfolio turnover rate (f)	4 %	4 %	2 %	6 %	6 %

(a)	On April 17, 2020, the State Street Equity 500 Index Fund underwent a 1-for-10 reverse share split. The per share data presented here have been retroactively adjusted to reflect this split.
(b)	Net investment income per share is calculated using the average shares method.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(d)	If the affiliates had not made contributions during the year ended December 31, 2022, the total return would have been (18.36)%.
(e)	Ratio does not include the expenses of the State Street Equity 500 Index II Portfolio.
(f)	Portfolio turnover rate is from the State Street Equity 500 Index II Portfolio.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET EQUITY 500 INDEX FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class K Shares
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20 (a)
Net asset value, beginning of period	$356.72	$287.55	$358.92	$286.97	$247.10
Income (loss) from investment operations:
Net investment income (loss) (b)	8.93	5.73	3.53	5.43	5.92
Net realized and unrealized gain (loss)	80.39	69.80	(68.82 )	76.42	39.30
Total from investment operations	89.32	75.53	(65.29 )	81.85	45.22
Contribution from affiliates	—	—	0.13	—	—
Distributions to shareholders from:
Net investment income	(7.14 )	(5.15 )	(3.14 )	(4.95 )	(4.55 )
Net realized gains	—	(1.21 )	(3.07 )	(4.95 )	(0.80 )
Total distributions	(7.14 )	(6.36 )	(6.21 )	(9.90 )	(5.35 )
Net asset value, end of period	$438.90	$356.72	$287.55	$358.92	$286.97
Total return (c)	24.99 %	26.26 %	(18.15 )%(d)	28.51 %	18.32 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$8,456,146	$4,819,793	$3,139,654	$2,950,849	$1,779,491
Ratios to Average Net Assets:
Total expenses (e)	0.08 %	0.09 %	0.08 %	0.10 %	0.11 %
Net expenses (e)	0.00 %(f)	0.00 %(f)	0.00 %(f)	0.02 %	0.02 %
Net investment income (loss)	2.18 %	1.77 %	1.14 %	1.65 %	2.37 %
Portfolio turnover rate (g)	4 %	4 %	2 %	6 %	6 %

(a)	On April 17, 2020, the State Street Equity 500 Index Fund underwent a 1-for-10 reverse share split. The per share data presented here have been retroactively adjusted to reflect this split.
(b)	Net investment income per share is calculated using the average shares method.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(d)	If the affiliates had not made contributions during the year ended December 31, 2022, the total return would have been (18.19)%.
(e)	Ratio does not include the expenses of the State Street Equity 500 Index II Portfolio.
(f)	Amount is less than 0.005%.
(g)	Portfolio turnover rate is from the State Street Equity 500 Index II Portfolio.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET GLOBAL ALL CAP EQUITY EX-U.S. INDEX FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class A
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20 (a)
Net asset value, beginning of period	$101.47	$90.38	$111.26	$107.01	$98.00
Income (loss) from investment operations:
Net investment income (loss) (b)	2.72	2.53	1.73	2.53	1.63
Net realized and unrealized gain (loss)	1.89	11.13	(20.44 )	5.89	8.74
Total from investment operations	4.61	13.66	(18.71 )	8.42	10.37
Distributions to shareholders from:
Net investment income	(2.73 )	(2.51 )	(1.76 )	(2.40 )	(1.34 )
Net realized gains	(1.37 )	(0.06 )	(0.41 )	(1.77 )	(0.02 )
Total distributions	(4.10 )	(2.57 )	(2.17 )	(4.17 )	(1.36 )
Net asset value, end of period	$101.98	$101.47	$90.38	$111.26	$107.01
Total return (c)	4.53 %	15.15 %	(16.83 )%	7.88 %	10.47 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$15,359	$14,026	$11,845	$12,507	$9,413
Ratios to Average Net Assets:
Total expenses (d)	0.62 %	0.64 %	0.63 %	0.63 %	0.70 %
Net expenses (d)	0.44 %	0.47 %	0.47 %	0.46 %	0.46 %
Net investment income (loss)	2.55 %	2.61 %	1.82 %	2.21 %	1.79 %
Portfolio turnover rate (e)	1 %	1 %	2 %	2 %	2 %

(a)	After the close of trading on April 17, 2020, the State Street Global All Cap Equity ex-U.S. Index Fund underwent a 1-for-10 reverse share split. The historical per share activity presented here has been retroactively adjusted to reflect this split.
(b)	Net investment income per share is calculated using the average shares method.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(d)	Ratio does not include the expenses of the corresponding Portfolio.
(e)	Portfolio turnover rate is from the corresponding Portfolio.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET GLOBAL ALL CAP EQUITY EX-U.S. INDEX FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class I
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20 (a)
Net asset value, beginning of period	$101.51	$90.44	$111.37	$107.12	$98.10
Income (loss) from investment operations:
Net investment income (loss) (b)	3.08	6.17	2.11	2.87	1.26
Net realized and unrealized gain (loss)	1.94	7.88	(20.57 )	5.91	9.44
Total from investment operations	5.02	14.05	(18.46 )	8.78	10.70
Distributions to shareholders from:
Net investment income	(3.15 )	(2.92 )	(2.06 )	(2.76 )	(1.66 )
Net realized gains	(1.37 )	(0.06 )	(0.41 )	(1.77 )	(0.02 )
Total distributions	(4.52 )	(2.98 )	(2.47 )	(4.53 )	(1.68 )
Net asset value, end of period	$102.01	$101.51	$90.44	$111.37	$107.12
Total return (c)	4.92 %	15.58 %	(16.58 )%	8.21 %	10.91 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$5,240	$5,203	$788	$676	$419
Ratios to Average Net Assets:
Total expenses (d)	0.25 %	0.24 %	0.33 %	0.32 %	0.40 %
Net expenses (d)	0.07 %	0.07 %	0.17 %	0.16 %	0.16 %
Net investment income (loss)	2.88 %	6.38 %	2.23 %	2.50 %	1.37 %
Portfolio turnover rate (e)	1 %	1 %	2 %	2 %	2 %

(a)	After the close of trading on April 17, 2020, the State Street Global All Cap Equity ex-U.S. Index Fund underwent a 1-for-10 reverse share split. The historical per share activity presented here has been retroactively adjusted to reflect this split.
(b)	Net investment income per share is calculated using the average shares method.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(d)	Ratio does not include the expenses of the corresponding Portfolio.
(e)	Portfolio turnover rate is from the corresponding Portfolio.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET GLOBAL ALL CAP EQUITY EX-U.S. INDEX FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class K
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20 (a)
Net asset value, beginning of period	$101.70	$90.58	$111.50	$107.24	$98.20
Income (loss) from investment operations:
Net investment income (loss) (b)	4.37	3.15	2.23	3.41	2.49
Net realized and unrealized gain (loss)	0.72	11.00	(20.57 )	5.54	8.40
Total from investment operations	5.09	14.15	(18.34 )	8.95	10.89
Distributions to shareholders from:
Net investment income	(3.19 )	(2.97 )	(2.17 )	(2.92 )	(1.83 )
Net realized gains	(1.37 )	(0.06 )	(0.41 )	(1.77 )	(0.02 )
Total distributions	(4.56 )	(3.03 )	(2.58 )	(4.69 )	(1.85 )
Net asset value, end of period	$102.23	$101.70	$90.58	$111.50	$107.24
Total return (c)	4.98 %	15.67 %	(16.45 )%	8.36 %	11.08 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$2,323,364	$1,451,657	$1,125,177	$1,136,787	$795,026
Ratios to Average Net Assets:
Total expenses (d)	0.20 %	0.19 %	0.18 %	0.18 %	0.25 %
Net expenses (d)	0.02 %	0.02 %	0.02 %	0.01 %	0.01 %
Net investment income (loss)	4.08 %	3.24 %	2.35 %	2.97 %	2.70 %
Portfolio turnover rate (e)	1 %	1 %	2 %	2 %	2 %

(a)	After the close of trading on April 17, 2020, the State Street Global All Cap Equity ex-U.S. Index Fund underwent a 1-for-10 reverse share split. The historical per share activity presented here has been retroactively adjusted to reflect this split.
(b)	Net investment income per share is calculated using the average shares method.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(d)	Ratio does not include the expenses of the corresponding Portfolio.
(e)	Portfolio turnover rate is from the corresponding Portfolio.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET SMALL/MID CAP EQUITY INDEX FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class A
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20 (a)
Net asset value, beginning of period	$263.26	$215.67	$338.94	$330.61	$253.40
Income (loss) from investment operations:
Net investment income (loss) (b)	5.55	2.47	2.63	10.39	2.82
Net realized and unrealized gain (loss)	38.83	50.64	(90.34 )	29.12	77.73
Total from investment operations	44.38	53.11	(87.71 )	39.51	80.55
Contribution from affiliates	—	—	0.17	—	—
Distributions to shareholders from:
Net investment income	(5.36 )	(3.02 )	(2.60 )	(10.62 )	(0.71 )
Net realized gains	—	(2.34 )	(33.13 )	(20.56 )	(2.63 )
Return of capital	—	(0.16 )	—	—	—
Total distributions	(5.36 )	(5.52 )	(35.73 )	(31.18 )	(3.34 )
Net asset value, end of period	$302.28	$263.26	$215.67	$338.94	$330.61
Total return (c)	16.81 %	24.60 %	(25.74 )%(d)	11.95 %	31.79 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$38,729	$33,064	$29,512	$44,290	$25,877
Ratios to Average Net Assets:
Total expenses (e)	0.44 %	0.58 %	0.59 %	0.60 %	0.69 %
Net expenses (e)	0.35 %	0.47 %	0.47 %	0.49 %	0.50 %
Net investment income (loss)	1.96 %	1.05 %	0.95 %	2.82 %	1.12 %
Portfolio turnover rate (f)	24 %	24 %	19 %	28 %	52 %

(a)	After the close of trading on April 17, 2020, the State Street Small/Mid Cap Equity Index Fund underwent a 1-for-20 reverse share split. The per share data presented here have been retroactively adjusted to reflect this split.
(b)	Net investment income per share is calculated using the average shares method.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(d)	If the affiliates had not made a contribution during the year ended December 31, 2022, the total return would have been (25.80)%.
(e)	Ratio does not include the expenses of the corresponding Portfolio.
(f)	Portfolio turnover rate is from the corresponding Portfolio.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET SMALL/MID CAP EQUITY INDEX FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class I
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20 (a)
Net asset value, beginning of period	$263.30	$215.69	$338.99	$330.66	$253.40
Income (loss) from investment operations:
Net investment income (loss) (b)	6.09	3.24	3.58	9.73	3.20
Net realized and unrealized gain (loss)	39.08	50.56	(90.69 )	30.71	78.24
Total from investment operations	45.17	53.80	(87.11 )	40.44	81.44
Contribution from affiliates	—	—	0.17	—	—
Distributions to shareholders from:
Net investment income	(6.13 )	(3.66 )	(3.23 )	(11.55 )	(1.55 )
Net realized gains	—	(2.34 )	(33.13 )	(20.56 )	(2.63 )
Return of capital	—	(0.19 )	—	—	—
Total distributions	(6.13 )	(6.19 )	(36.36 )	(32.11 )	(4.18 )
Net asset value, end of period	$302.34	$263.30	$215.69	$338.99	$330.66
Total return (c)	17.10 %	24.92 %	(25.56 )%(d)	12.22 %	32.15 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$9,129	$9,921	$8,058	$11,663	$7,400
Ratios to Average Net Assets:
Total expenses (e)	0.20 %	0.33 %	0.34 %	0.35 %	0.44 %
Net expenses (e)	0.11 %	0.22 %	0.22 %	0.24 %	0.25 %
Net investment income (loss)	2.15 %	1.37 %	1.31 %	2.65 %	1.28 %
Portfolio turnover rate (f)	24 %	24 %	19 %	28 %	52 %

(a)	After the close of trading on April 17, 2020, the State Street Small/Mid Cap Equity Index Fund underwent a 1-for-20 reverse share split. The per share data presented here have been retroactively adjusted to reflect this split.
(b)	Net investment income per share is calculated using the average shares method.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(d)	If the affiliates had not made a contribution during the year ended December 31, 2022, the total return would have been (25.62)%.
(e)	Ratio does not include the expenses of the corresponding Portfolio.
(f)	Portfolio turnover rate is from the corresponding Portfolio.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET SMALL/MID CAP EQUITY INDEX FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class K
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20 (a)
Net asset value, beginning of period	$263.34	$215.72	$339.03	$330.71	$253.40
Income (loss) from investment operations:
Net investment income (loss) (b)	6.56	3.97	4.39	12.44	7.44
Net realized and unrealized gain (loss)	38.86	50.38	(91.00 )	28.74	74.73
Total from investment operations	45.42	54.35	(86.61 )	41.18	82.17
Contribution from affiliates	—	—	0.17	—	—
Distributions to shareholders from:
Net investment income	(6.41 )	(4.17 )	(3.74 )	(12.30 )	(2.23 )
Net realized gains	—	(2.34 )	(33.13 )	(20.56 )	(2.63 )
Return of capital	—	(0.22 )	—	—	—
Total distributions	(6.41 )	(6.73 )	(36.87 )	(32.86 )	(4.86 )
Net asset value, end of period	$302.35	$263.34	$215.72	$339.03	$330.71
Total return (c)	17.19 %	25.17 %	(25.41 )%(d)	12.45 %	32.44 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$594,601	$489,362	$329,843	$354,408	$216,700
Ratios to Average Net Assets:
Total expenses (e)	0.12 %	0.13 %	0.14 %	0.15 %	0.24 %
Net expenses (e)	0.03 %	0.02 %	0.02 %	0.04 %	0.05 %
Net investment income (loss)	2.31 %	1.68 %	1.60 %	3.38 %	2.91 %
Portfolio turnover rate (f)	24 %	24 %	19 %	28 %	52 %

(a)	After the close of trading on April 17, 2020, the State Street Small/Mid Cap Equity Index Fund underwent a 1-for-20 reverse share split. The per share data presented here have been retroactively adjusted to reflect this split.
(b)	Net investment income per share is calculated using the average shares method.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(d)	If the affiliates had not made a contribution during the year ended December 31, 2022, the total return would have been (25.47)%.
(e)	Ratio does not include the expenses of the corresponding Portfolio.
(f)	Portfolio turnover rate is from the corresponding Portfolio.

Index/Trademark Licenses/Disclaimers

The Index Providers are not affiliated with the Trust, the Adviser, the Funds' Administrator, Sub-Administrator, Custodian, Transfer Agent, SSGA FD or any of their respective affiliates. The Adviser (“Licensee”) has entered into license agreements with the Index Providers pursuant to which the Adviser pays a fee to use their respective Indices. The Adviser is sub-licensing rights to the Indices to the Funds at no charge.

S&P Index: The S&P 500® Index (the “Index”) is a product of S&P Dow Jones Indices LLC or its affiliates (“SPDJI”) and has been licensed for use by the Adviser. S&P®, Standard & Poor's®, and S&P 500® are registered trademarks of Standard & Poor's Financial Services LLC (“S&P”); Dow Jones® is a registered trademark of Dow Jones Trademark Holdings LLC (“Dow Jones”); and these trademarks have been licensed for use by SPDJI and sub-licensed for certain purposes by the Adviser. It is not possible to invest in an index.

The State Street Equity 500 Index Fund is not sponsored, endorsed, sold or marketed by SPDJI, Dow Jones, S&P, any of their respective affiliates (collectively, “S&P Dow Jones Indices”). S&P Dow Jones Indices does not make any representation or warranty, express or implied, to the owners of the State Street Equity 500 Index Fund or any member of the public regarding the advisability of investing in securities generally or in the State Street Equity 500 Index Fund particularly or the ability of the Index to track general market performance. S&P Dow Jones Indices licenses to Licensee the Index and certain trademarks, service marks and/or trade names of S&P Dow Jones Indices and/or its licensors. The Index is determined, composed and calculated by S&P Dow Jones Indices without regard to Licensee or the State Street Equity 500 Index Fund. S&P Dow Jones Indices has no obligation to take the needs of Licensee or the owners of the State Street Equity 500 Index Fund into consideration in determining, composing or calculating the Index. S&P Dow Jones Indices is not responsible for and has not participated in the determination of the prices, and amount of the State Street Equity 500 Index Fund or the timing of the issuance or sale of the State Street Equity 500 Index Fund or in the determination or calculation of the equation by which the State Street Equity 500 Index Fund is to be converted into cash, surrendered or redeemed, as the case may be. S&P Dow Jones Indices has no obligation or liability in connection with the administration, marketing or trading of the State Street Equity 500 Index Fund. S&P Dow Jones Indices LLC is not an investment or tax advisor. Inclusion of a security within an index is not a recommendation by S&P Dow Jones Indices to buy, sell, or hold such security, nor is it considered to be investment advice.

NEITHER S&P DOW JONES INDICES NOR THIRD PARTY LICENSOR GUARANTEES THE ADEQUACY, ACCURACY, TIMELINESS AND/OR THE COMPLETENESS OF THE INDEX OR ANY DATA RELATED THERETO OR ANY COMMUNICATION, INCLUDING BUT NOT LIMITED TO, ORAL OR WRITTEN COMMUNICATION (INCLUDING ELECTRONIC COMMUNICATIONS) WITH RESPECT THERETO. S&P DOW JONES INDICES AND THIRD PARTY LICENSOR SHALL NOT BE SUBJECT TO ANY DAMAGES OR LIABILITY FOR ANY ERRORS, OMISSIONS, OR DELAYS THEREIN. S&P DOW JONES INDICES AND THIRD PARTY LICENSOR MAKES NO EXPRESS OR IMPLIED WARRANTIES, AND EXPRESSLY DISCLAIMS ALL WARRANTIES, OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR USE OR AS TO RESULTS TO BE OBTAINED BY LICENSEE, OWNERS OF THE STATE STREET EQUITY 500 INDEX FUND, OR ANY OTHER PERSON OR ENTITY FROM THE USE OF THE INDICES OR WITH RESPECT TO ANY DATA RELATED THERETO. WITHOUT LIMITING ANY OF THE FOREGOING, IN NO EVENT WHATSOEVER SHALL S&P DOW JONES INDEX OR THIRD PARTY LICENSOR BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES INCLUDING BUT NOT LIMITED TO, LOSS OF PROFITS, TRADING LOSSES, LOST TIME OR GOODWILL, EVEN IF THEY HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES, WHETHER IN CONTRACT, TORT, STRICT LIABILITY, OR OTHERWISE. THERE ARE NO THIRD PARTY BENEFICIARIES OF ANY AGREEMENTS OR ARRANGEMENTS BETWEEN S&P DOW JONES INDICES AND LICENSEE, OTHER THAN THE LICENSORS OF S&P DOW JONES INDICES.

“Bloomberg®” and the Bloomberg U.S. Aggregate Bond Index (the “Bloomberg Index”) is a service mark of Bloomberg Finance L.P. and its affiliates, including Bloomberg Index Services Limited (“BISL”), the administrator of the Bloomberg Index (collectively, “Bloomberg”), and have been licensed for use for certain purposes by the Licensee.

The State Street Aggregate Bond Index Portfolio (the “Product”) is not sponsored, endorsed, sold or marketed by Bloomberg. Bloomberg does not make any representation or warranty, express or implied, to the owners of or counterparties to the Products or any member of the public regarding the advisability of investing in securities generally or in the Product particularly. The only relationship of Bloomberg to the Licensee in respect of the Bloomberg Index is the licensing of certain trademarks, trade names and service marks and of the Bloomberg Index, which is determined, composed and calculated by BISL without regard to the Licensee or the Product. Bloomberg has no obligation to take the needs of the Licensee or the owners of the Product into consideration in determining, composing or calculating the Bloomberg Index. Bloomberg is not responsible for and has not participated in the determination of the timing, price, or quantities of the Product to be issued. Bloomberg shall not have any obligation or liability, including, without limitation, to the Product's customers, in connection with the administration, marketing or trading of the Product.

BLOOMBERG DOES NOT GUARANTEE THE ACCURACY AND/OR THE COMPLETENESS OF THE BLOOMBERG INDEX OR ANY DATA RELATED THERETO AND SHALL HAVE NO LIABILITY FOR ANY ERRORS, OMISSIONS OR INTERRUPTIONS THEREIN. BLOOMBERG DOES NOT MAKE ANY WARRANTY, EXPRESS OR IMPLIED, AS TO RESULTS TO BE OBTAINED BY THE LICENSEE, OWNERS OF THE PRODUCTS OR ANY OTHER PERSON OR ENTITY FROM THE USE OF THE BLOOMBERG INDEX OR ANY DATA RELATED THERETO. BLOOMBERG DOES NOT MAKE ANY EXPRESS OR IMPLIED WARRANTIES AND EXPRESSLY DISCLAIMS ALL WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR USE WITH RESPECT TO THE BLOOMBERG INDEX OR ANY DATA RELATED THERETO. WITHOUT LIMITING ANY OF THE FOREGOING, TO THE MAXIMUM EXTENT ALLOWED BY LAW, BLOOMBERG, ITS LICENSORS, AND ITS AND THEIR RESPECTIVE EMPLOYEES, CONTRACTORS, AGENTS, SUPPLIERS, AND VENDORS SHALL HAVE NO LIABILITY OR RESPONSIBILITY WHATSOEVER FOR ANY INJURY OR DAMAGES—WHETHER DIRECT, INDIRECT, CONSEQUENTIAL, INCIDENTAL, PUNITIVE OR OTHERWISE—ARISING IN CONNECTION WITH THE PRODUCTS OR BLOOMBERG INDEX OR ANY DATA OR VALUES RELATING THERETO—WHETHER ARISING FROM THEIR NEGLIGENCE OR OTHERWISE, EVEN IF NOTIFIED OF THE POSSIBILITY THEREOF.

THE STATE STREET GLOBAL ALL CAP EQUITY EX-U.S. INDEX FUND IS NOT SPONSORED, ENDORSED, SOLD OR PROMOTED BY MSCI INC. (“MSCI”), ANY OF ITS AFFILIATES, ANY OF ITS INFORMATION PROVIDERS OR ANY OTHER THIRD PARTY INVOLVED IN, OR RELATED TO, COMPILING, COMPUTING OR CREATING ANY MSCI INDEX (COLLECTIVELY, THE “MSCI PARTIES”).THE MSCI INDICES ARE THE EXCLUSIVE PROPERTY OF MSCI. MSCI AND THE MSCI INDEX NAMES ARE SERVICE MARK(S) OF MSCI OR ITS AFFILIATES AND HAVE BEEN LICENSED FOR USE FOR CERTAIN PURPOSES BY THE LICENSEE. NONE OF THE MSCI PARTIES MAKES ANY REPRESENTATION OR WARRANTY, EXPRESS OR IMPLIED, TO THE ISSUER OR OWNERS OF THE MSCI FUNDS OR ANY OTHER PERSON OR ENTITY REGARDING THE ADVISABILITY OF INVESTING IN FUNDS GENERALLY OR IN THE MSCI FUNDS PARTICULARLY OR THE ABILITY OF ANY MSCI INDEX TO TRACK CORRESPONDING STOCK MARKET PERFORMANCE. MSCI OR ITS AFFILIATES ARE THE LICENSORS OF CERTAIN TRADEMARKS, SERVICE MARKS AND TRADE NAMES AND OF THE MSCI INDICES WHICH ARE DETERMINED, COMPOSED AND CALCULATED BY MSCI WITHOUT REGARD TO THE MSCI FUNDS OR THE ISSUER OR OWNERS OF THE MSCI FUNDS OR ANY OTHER PERSON OR ENTITY. NONE OF THE MSCI PARTIES HAS ANY OBLIGATION TO TAKE THE NEEDS OF THE ISSUER OR OWNERS OF THE MSCI FUNDS OR ANY OTHER PERSON OR ENTITY INTO CONSIDERATION IN DETERMINING, COMPOSING OR CALCULATING THE MSCI INDICES. NONE OF THE MSCI PARTIES IS RESPONSIBLE FOR OR HAS PARTICIPATED IN THE DETERMINATION OF THE TIMING OF, PRICES AT, OR QUANTITIES OF THE MSCI FUNDS TO BE ISSUED OR IN THE DETERMINATION OR CALCULATION OF THE EQUATION BY OR THE CONSIDERATION INTO WHICH THE MSCI FUNDS ARE REDEEMABLE. FURTHER, NONE OF THE MSCI PARTIES HAS ANY OBLIGATION OR LIABILITY TO THE ISSUER OR OWNERS OF THE MSCI FUNDS OR ANY OTHER PERSON OR ENTITY IN CONNECTION WITH THE ADMINISTRATION, MARKETING OR OFFERING OF THE MSCI FUNDS.

PERSON OR ENTITY, FROM THE USE OF ANY MSCI INDEX OR ANY DATA INCLUDED THEREIN. NONE OF THE MSCI PARTIES SHALL HAVE ANY LIABILITY FOR ANY ERRORS, OMISSIONS OR INTERRUPTIONS OF OR IN CONNECTION WITH ANY MSCI INDEX OR ANY DATA INCLUDED THEREIN. FURTHER, NONE OF THE MSCI PARTIES MAKES ANY EXPRESS OR IMPLIED WARRANTIES OF ANY KIND, AND THE MSCI PARTIES HEREBY EXPRESSLY DISCLAIM ALL WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, WITH RESPECT TO EACH MSCI INDEX AND ANY DATA INCLUDED THEREIN. WITHOUT LIMITING ANY OF THE FOREGOING, IN NO EVENT SHALL ANY OF THE MSCI PARTIES HAVE ANY LIABILITY FOR ANY DIRECT, INDIRECT, SPECIAL, PUNITIVE, CONSEQUENTIAL OR ANY OTHER DAMAGES (INCLUDING LOST PROFITS) EVEN IF NOTIFIED OF THE POSSIBILITY OF SUCH DAMAGES.

NO PURCHASER, SELLER OR HOLDER OF THE MSCI FUNDS, OR ANY OTHER PERSON OR ENTITY, SHOULD USE OR REFER TO ANY MSCI TRADE NAME, TRADEMARK OR SERVICE MARK TO SPONSOR, ENDORSE, MARKET OR PROMOTE THESE FUNDS WITHOUT FIRST CONTACTING MSCI TO DETERMINE WHETHER MSCI'S PERMISSION IS REQUIRED. UNDER NO CIRCUMSTANCES MAY ANY PERSON OR ENTITY CLAIM ANY AFFILIATION WITH MSCI WITHOUT THE PRIOR WRITTEN PERMISSION OF MSCI.

The State Street Small/Mid Cap Equity Index Fund has been developed solely by the Adviser. The State Street Small/Mid Cap Equity Index Fund is not in any way connected to or sponsored, endorsed, sold or promoted by the London Stock Exchange Group plc and its group undertakings (collectively, the “LSE Group”). FTSE Russell is a trading name of certain of the LSE Group companies.

All rights in the Russell Small Cap Completeness Index (the “Index”) vest in the relevant LSE Group company which owns the Index. “Russell®” is a trademark of the relevant LSE Group company and is used by any other LSE Group company under license.

The Index is calculated by or on behalf of FTSE International Limited or its affiliate, agent or partner. The LSE Group does not accept any liability whatsoever to any person arising out of (a) the use of, reliance on or any error in the Index or (b) investment in or operation of the State Street Small/Mid Cap Equity Index Fund. The LSE Group makes no claim, prediction, warranty or representation either as to the results to be obtained from the State Street Small/Mid Cap Equity Index Fund or the suitability of the Index for the purpose to which it is being put by the Adviser.

Contacting the State Street Funds

Online:	www.ssga.com	24 hours a day, 7 days a week
Phone:	(800) 647-7327	Monday – Friday 8:00 am – 6:00 pm EST

Written requests should be sent to:

Regular mail	Overnight/Registered, Express, Certified Mail
State Street Funds P.O. Box 219737 Kansas City, MO 64121-9737	State Street Funds 801 Pennsylvania Avenue, Suite 219737 Kansas City, MO 64105-1307

The Funds do not consider the U.S. Postal Service or other independent delivery services to be their agents. Therefore, deposits in the mail or with such services, or receipt at the Funds' post office box, of purchase orders or redemption requests, do not constitute receipt by the Funds or Transfer Agent.

For more information about the Funds:

The Funds' SAI includes additional information about the Funds and is incorporated by reference into this document. Additional information about the Funds' investments is available in the Funds' most recent annual and semi-annual reports to shareholders and in each Fund's Form N-CSR filing. In a Fund's annual report, you will find a discussion of the market conditions and investment strategies that significantly affected the Fund's performance during its last fiscal year. In a Fund's Form N-CSR, you will find the Fund's annual and semi-annual financial statements. The Funds' SAI is available, without charge, upon request. The Funds' annual and semi-annual reports are available, without charge, upon request. Shareholders in the Funds may make inquiries to the Funds to receive such information by calling (800) 997-7327 or the customer service center at the telephone number shown in the accompanying contract prospectus, if applicable. Each Fund's Prospectus, SAI, annual and semi-annual reports to shareholders and other information such as each Fund's financial statements are available, free of charge, on the Funds' website at www.ssga.com.

Reports and other information about the Funds are available free of charge on the EDGAR Database on the SEC's Internet site at http://www.sec.gov. Copies of this information also may be obtained, after paying a duplicating fee, by electronic request at the following E-mail address: publicinfo@sec.gov.

SSGA Funds Management, Inc

ONE IRON STREET

BOSTON, MASSACHUSETTS 02210

SSITEQABSTATPROThe State Street Institutional Investment Trust's Investment Company Act File Number is 811-09819.

Prospectus

April 30, 2025

State Street Institutional
Investment Trust

State Street Emerging Markets Equity Index Fund

Class K (SSKEX)

State Street Balanced Index Fund

Class K (SSBIX)

The U.S. Securities and Exchange Commission has not approved or disapproved these securities or passed upon the adequacy of this Prospectus. Any representation to the contrary is a criminal offense.

An investment in any of the Funds offered by this Prospectus is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

TABLE OF CONTENTS

Fund Summaries	1
State Street Emerging Markets Equity Index Fund	1
State Street Balanced Index Fund	10
Additional Information About Investment Objectives, Principal Strategies and Risks	17
Additional Information About Non-Principal Investment Strategies and Risks	32
Portfolio Holdings Disclosure	34
Management and Organization	35
Shareholder Information	37
Dividends, Distributions and Tax Considerations	45
Financial Intermediary Arrangements	47
Financial Highlights	49

State Street Emerging Markets Equity Index Fund

Investment Objective

The State Street Emerging Markets Equity Index Fund (the “Emerging Markets Equity Index Fund” or the “Fund”) seeks to provide investment results that, before fees and expenses, correspond generally to the total return of an index that tracks the performance of emerging market equity securities.

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Management Fee	0.080%
Distribution and/or Shareholder Service (12b-1) Fees	0.000%
Other Expenses	0.170%
Total Annual Fund Operating Expenses	0.250%
Less Fee Waivers and/or Expense Reimbursements1	(0.176%)
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements1	0.074%

The Fund's investment adviser, SSGA Funds Management, Inc. (the “Adviser” or “SSGA FM”), is contractually obligated until April 30, 2026 (i) to waive up to the full amount of the advisory fee payable by the Fund, and/or (ii) to reimburse the Fund to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, extraordinary expenses, acquired fund fees and expenses, any class-specific expenses, such as distribution, shareholder servicing and sub-transfer agency fees) exceed 0.074% of average daily net assets on an annual basis. This waiver and/or reimbursement may not be terminated prior to April 30, 2026 except with approval of the Fund's Board of Trustees.

Example:

1 year	3 years	5 years	10 years
$8	$63	$123	$301

Portfolio Turnover:

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund Shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 7% of the average value of its portfolio.

Principal Investment Strategies

The Fund is an “index” fund that seeks to track, before fees and expenses, the total return of the MSCI Emerging Markets Index (the “Index”) over the long term. As an “index” fund, the Fund is not managed according to traditional methods of “active” investment management, which involve the buying and selling of securities based upon economic, financial and market analysis and investment judgment.

In seeking to track the performance of the Index, the Fund employs a sampling strategy, which means that the Fund is not required to purchase all of the securities represented in the Index. Instead, the Fund may purchase a subset of the securities in the Index in an effort to create a portfolio of securities with generally the same risk and return characteristics as those of the Index. The number of holdings in the Fund will be based on a number of factors, including asset size of the Fund. SSGA Funds Management, Inc. (“SSGA FM” or the “Adviser”), the investment adviser to the Fund, may invest the Fund's assets in a subset of securities in the Index or may invest the Fund's assets in substantially all of the securities represented in the Index, in approximately the same proportions as the Index, but reserves the right to hold as many securities as it believes necessary to achieve the Fund's investment objective. In addition, from time to time stocks are added to or removed from the Index. The Fund may sell securities that are represented in the Index, or purchase securities that are not yet represented in the Index, in anticipation of their removal from or addition to the Index. Under normal circumstances, the Fund generally invests substantially all, but at least 80%, of its net assets (plus borrowings, if any) in securities included in the Index or in other securities of emerging market companies providing exposure comparable, in the Adviser's view, to securities comprising the Index. An “emerging market company” is any company domiciled or doing a substantial portion of its business in countries represented in the Index at the time of purchase. These securities may be represented by American Depositary Receipts (“ADRs”), Global Depositary Receipts (“GDRs”), Non-Voting Depositary Receipts (“NVDRs”) or Participatory Notes (“P-Notes”). The notional value of the Fund's investments in derivatives or other synthetic instruments that provide exposures comparable, in the judgment of the Adviser, to investments in the Index may be counted toward satisfaction of this 80% policy. The Fund will provide shareholders with at least 60 days' notice prior to any change in this 80% investment policy. The Fund may invest a portion of its assets in cash and cash equivalents, repurchase agreements and money market instruments, such as money market funds (including money market funds advised by the Adviser).

The Fund may purchase or sell futures contracts, or options on those futures, in lieu of investing directly in the stocks making up the Index. The Fund might do so, for example, in order to increase its investment exposure pending investment of cash in stocks or other investments. Alternatively, the Fund might use futures or options on futures to reduce its investment exposure in situations where it intends to sell a portion of the stocks in its portfolio but the sale has not yet been completed. The Fund may enter into other derivatives transactions, including the use of options, forwards or swap transactions, in lieu of investing directly in the stocks making up the Index. The Fund may also, to the extent permitted by applicable law, invest in shares of other mutual funds whose investment objectives and policies are similar to those of the Fund (including funds advised by the Adviser).

The Index is a free float-adjusted market capitalization index that is designed to measure equity market performance of emerging market countries. As of February 28, 2025, the Index comprised 1,250 securities covering large- and mid-cap companies across 24 countries and represented 85% of the market capitalization of MSCI Emerging Markets Investable Market Index (IMI), which is composed of large-, mid- and small-cap companies. As of February 28, 2025, the market capitalization of the companies included in the Index ranged from $129.39 million to $780.84 billion. Countries represented in the Index have historically included, among others, Brazil, Chile, China, Colombia, Czech Republic, Egypt, Greece, Hungary, India, Indonesia, Korea, Kuwait, Malaysia, Mexico, Peru, Philippines, Poland, Qatar, Saudi Arabia, South Africa, Taiwan, Thailand, Turkey and United Arab Emirates. As of February 28, 2025, a significant portion of the Index comprised companies in the financials and technology sectors, although this may change from time to time. As of February 28, 2025, a significant portion of the Index comprised companies located in China, Taiwan and India and a significant portion of the Index constituents are denominated in Hong Kong Dollars and Taiwan Dollars, although this may change from time to time.

The Index is sponsored by MSCI, Inc. (the “Index Provider”), which is not affiliated with the Fund or the Adviser. The Index Provider determines the composition of the Index, relative weightings of the securities in the Index and publishes information regarding the market value of the Index.

Principal Risks

Market Risk: The Fund's investments are subject to changes in general economic conditions, general market fluctuations and the risks inherent in investment in securities markets. Investment markets can be volatile and prices of investments can change substantially due to various factors, including, but not limited to, economic growth or recession, changes in interest rates, inflation, changes in the actual or perceived creditworthiness of issuers, and general market liquidity. The Fund is subject to the risk that geopolitical events will disrupt securities markets and adversely affect global economies and markets. Local, regional or global events such as war, military conflicts, acts of terrorism, trade policy changes or disputes, the threat or actual imposition of tariffs, natural disasters, the spread of infectious illness or other public health issues, or other events could have a significant impact on the Fund and its investments.

Non-U.S. Securities Risk: Non-U.S. securities (including depositary receipts) are subject to political, regulatory, and economic risks not present in domestic investments. There may be less information publicly available about a non-U.S. entity than about a U.S. entity, and many non-U.S. entities are not subject to accounting, auditing, legal and financial report standards comparable to those in the United States. Further, such entities and/or their securities may be subject to risks associated with currency controls; expropriation; changes in tax policy; greater market volatility; differing securities market structures; higher transaction costs; and various administrative difficulties, such as delays in clearing and settling portfolio transactions or in receiving payment of dividends. Securities traded on foreign markets may be less liquid (harder to sell) than securities traded domestically. Foreign governments may impose restrictions on the repatriation of capital to the U.S. In addition, to the extent that the Fund buys securities denominated in a foreign currency, there are special risks such as changes in currency exchange rates and the risk that a foreign government could regulate foreign exchange transactions. In addition, to the extent investments are made in a limited number of countries, events in those countries will have a more significant impact on the Fund. Investments in depositary receipts may be less liquid and more volatile than the underlying shares in their primary trading market.

South Korea: Economic and political developments of South Korean neighbors may have an adverse effect on the South Korean economy. Substantial political tensions exist between North Korea and South Korea and, recently, these political tensions have escalated. The outbreak of hostilities between the two nations, or even the threat of such an outbreak, will likely adversely impact the South Korean economy. In addition, South Korea's economic growth potential has recently been on a decline, mainly because of a rapidly aging population and structural problems. Among these structural concerns are the country's underdeveloped financial markets and a general lack of regulatory transparency. The restructuring of the South Korean economy, including the creation of a mechanism for bankrupt firms to exit the market, remains an important unfinished task. These factors may adversely affect the South Korean economy and cause a diversion of corporate investment to China and other lower wage countries. South Korea's economic growth potential is susceptible to problems from large scale emigration, rigid labor regulations and ongoing labor relations issues.

Taiwan: Taiwan's geographic proximity and history of political contention with China have resulted in ongoing tensions between the two countries. These tensions may materially affect the Taiwanese economy and its securities market. Taiwan's economy is export-oriented, so it depends on an open world trade regime and remains vulnerable to fluctuations in the world economy. Rising labor costs and increasing environmental consciousness have led some labor-intensive industries to relocate to countries with cheaper work forces, and continued labor outsourcing may adversely affect the Taiwanese economy.

Financial Institutions Risk: Changes in the creditworthiness of financial institutions (such as banks and broker-dealers) may adversely affect the values of instruments of issuers in financial industries. Adverse developments in banking and other financial industries may cause the Fund to underperform relative to other funds that invest more broadly across different industries or have a smaller exposure to financial institutions. There can be no certainty that the actions taken by the U.S. government to strengthen public confidence in the U.S. banking system will be effective in mitigating the effects of financial institution failures on the economy and restoring public confidence in the U.S. banking system. Other adverse developments that affect financial institutions or the financial services industry generally, or concerns or rumors about any events of these kinds or other similar risks, may reduce liquidity in the market generally or have other adverse effects on the economy or the Fund. In addition, the Fund may not be able to identify all potential solvency or stress concerns with respect to a financial institution or to transfer assets from one bank or financial institution to another in a timely manner in the event such bank or financial institution comes under stress or fails. Changes in governmental regulation and oversight of financial institutions may have an adverse effect on the financial condition of a financial institution.

Frontier Markets Risk: Investments in frontier markets may be more volatile and less liquid than investments in more developed markets or in other emerging market countries. Risks that are characteristic of many emerging markets generally may be especially heightened in frontier markets due to political, economic, financial, or other factors.

Futures Contract Risks; Other Exchange-Traded Derivatives: The risk of loss relating to the use of futures contracts and other exchange-traded derivatives is potentially unlimited. There is no assurance that a liquid secondary market on an exchange will exist for any particular futures contract or other exchange-traded derivative or at any particular time. In the event no such market exists for a particular derivative, it might not be possible to effect closing transactions, and the Fund will be unable to terminate its exposure to the derivative. If the Fund uses futures contracts or other exchange-traded derivatives for hedging purposes, there is a risk of imperfect correlation between movements in the prices of the derivatives and movements in the securities or index underlying the derivatives or movements in the prices of the Fund's investments that are the subject of such hedge. Certain foreign futures contracts and other exchange-traded derivatives may be less liquid and more volatile than U.S. contracts. The Fund may be delayed or prevented from recovering margin or other amounts deposited with a futures commission merchant or futures clearinghouse.

Mid-Capitalization Securities Risk: The securities of mid-capitalization companies may be more volatile and may involve more risk than the securities of larger companies. These companies may have limited product lines, markets or financial resources, may lack the competitive strength of larger companies, and may depend on a few key employees. In addition, these companies may have been recently organized and may have little or no track record of success. The securities of mid-sized companies may trade less frequently and in smaller volumes than more widely held securities. Some securities of mid-sized issuers may be illiquid or may be restricted as to resale, and their values may be volatile.

Money Market Fund Investment Risk: An investment in a money market fund is not a deposit of any bank and is not insured or guaranteed by the FDIC or any other government agency. Certain money market funds seek to preserve the value of their shares at $1.00 per share, although there can be no assurance that they will do so, and it is possible to lose money by investing in such a money market fund. A major or unexpected change in interest rates or

a decline in the credit quality of an issuer or entity providing credit support, an inactive trading market for money market instruments, or adverse market, economic, industry, political, regulatory, geopolitical, and other conditions could cause the share price of such a money market fund to fall below $1.00. Other money market funds price and transact at a “floating” NAV that will fluctuate along with changes in the market-based value of fund assets. Shares sold utilizing a floating NAV may be worth more or less than their original purchase price. Recent changes in the regulation of money market funds may affect the operations and structures of money market funds.

Technology Sector Risk: A Fund's assets may be focused in the technology sector, which means a Fund will be more affected by the performance of the technology sector than a fund that is more diversified. Market or economic factors impacting technology companies and companies that rely heavily on technological advances could have a major effect on the value of the Fund's investments. The value of stocks of technology companies and companies that rely heavily on technology is particularly vulnerable to rapid changes in technology product cycles, rapid product obsolescence, government regulation and competition, both domestically and internationally, including competition from foreign competitors with lower production costs. Stocks of technology companies and companies that rely heavily on technology, especially those of smaller, less-seasoned companies, tend to be more volatile than the overall market. Technology companies are heavily dependent on patent and intellectual property rights, the loss or impairment of which may adversely affect profitability. Additionally, companies in the technology sector may face dramatic and often unpredictable changes in growth rates and competition for the services of qualified personnel.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund's returns from year-to-year and by showing how the Fund's average annual returns for the periods indicated compared with that of (i) a broad measure of market performance and (ii) the Index. The bar chart shows how the Class K shares' returns have varied for each full calendar year shown. Except for differences in returns resulting from differences in fees and expenses, all share classes would have substantially similar returns because all share classes invest in the same portfolio of securities. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (800) 997-7327 or by visiting our website at www.ssga.com.

Annual Total Return (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	19.13%	Q4 2020
Lowest Quarterly Return	-24.02%	Q1 2020

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Since Inception
	One Year	Five Years	12/18/2015
Class K
Return Before Taxes	7.01 %	1.42 %	5.66 %
Return After Taxes on Distributions	6.31 %	0.78 %	5.00 %
Return After Taxes on Distributions and Sale of Fund Shares	4.67 %	1.08 %	4.49 %
MSCI Emerging Market Index (reflects no deduction for fees, expenses or taxes other than withholding taxes on reinvested dividends)	7.50 %	1.70 %	6.00 %
MSCI ACWI ex USA Index (reflects no deduction for fees, expenses or taxes other than withholding taxes on reinvested dividends)	5.53 %	4.10 %	6.18 %

The Fund will make updated performance information, including its current net asset value, available at the Fund's website: www.ssga.com.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

The professionals primarily responsible for the day-to-day management of the Fund are Thomas Coleman and Olga Winner, each of which has served as a portfolio manager of the Fund since inception in 2015.

Thomas Coleman, CFA, is a Vice President of the Adviser and a Senior Portfolio Manager in the Systematic Equity Group. He joined the Adviser in 1998.

Olga Winner, CFA, is a Vice President of the Adviser and a Senior Portfolio Manager in the Systematic Equity Group. She joined the Adviser in 2007.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Class K
To establish an account	None
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

Written Requests and Wire Transfers. You may purchase or redeem Fund Shares by written request or wire transfer.

Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Intermediary:

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

State Street Balanced Index Fund

Investment Objective

With 60% of its assets, the State Street Balanced Index Fund (the “Fund”) seeks to track the performance of a benchmark that measures the investment return of the overall U.S. stock market. With 40% of its assets, the Fund seeks to track the performance of a benchmark that measures the U.S. dollar denominated investment grade fixed-rate taxable bond market.

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Management Fee	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%
Other Expenses1	0.24%
Acquired Fund Fees and Expenses2	0.01%
Total Annual Fund Operating Expenses	0.30%
Less Fee Waivers and/or Expense Reimbursements3	(0.25%)
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	0.05%

Other Expenses are based on estimates for the current fiscal year.

Acquired Fund Fees and Expenses are based on estimated amounts for the current fiscal year.

The Fund's investment adviser, SSGA Funds Management, Inc. (the “Adviser” or “SSGA FM”), is contractually obligated until April 30, 2026 (i) to waive up to the full amount of the advisory fee payable by the Fund, and/or (ii) to reimburse the Fund to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, extraordinary expenses, any class-specific expenses, such as distribution, shareholder servicing and sub-transfer agency fees) exceed 0.05% of average daily net assets on an annual basis. This waiver and/or reimbursement may not be terminated prior to April 30, 2026 except with approval of the Fund's Board of Trustees.

Example:

1 year	3 years	5 years	10 years
$5	$71	$143	$356

Portfolio Turnover:

Principal Investment Strategies

The Fund uses a balanced approach to invest in a broad range of securities, including common stocks and fixed-income securities. Under normal circumstances, the Fund will invest at least 80% of its net assets (plus borrowings, if any) in securities comprising, in the aggregate, the indexes it seeks to track as part of its principal investment strategy, including securities that the Adviser determines have economic characteristics that are comparable to the economic characteristics of securities that comprise such indexes.

The Fund employs an indexing investment approach designed to track the performance of two benchmark indexes in a 60%/40% split between equity and fixed-income.

For the 60% equity allocation, the Fund seeks to track, before fees and expenses, the total return performance of the Dow Jones U.S. Total Stock Market Index, a member of the Dow Jones Total Stock Market Indices family, which is designed to measure all U.S. equity issues with readily available prices (the “Equity Index,” and also an “Index”), over the long term.

For the 40% fixed income allocation, the Fund obtains its investment exposure by investing in a mutual fund that seeks to track, before fees and expenses, the total return performance of the Bloomberg U.S. Aggregate Bond Index, which is a benchmark that measures the performance of the U.S. dollar denominated investment grade fixed-rate taxable bond market (the “U.S. Aggregate Bond Index,” and also an “Index”), over the long term. Fixed income securities comprising the U.S. Aggregate Bond Index may include Treasuries, government-related and corporate securities, mortgage-backed securities (“MBS”) (agency fixed-rate pass-throughs), asset-backed securities (“ABS”) and commercial mortgage-backed securities (“CMBS”) (agency and non-agency).

The Fund's investments in fixed-income securities will be achieved primarily through a passive investment approach of investing all or substantially all of its assets allocated to fixed income investments in the State Street Aggregate Bond Index Portfolio (the “Aggregate Bond Index Portfolio” or the “Portfolio”), a mutual fund also advised by SSGA FM (“SSGA FM” or the “Adviser”). The Aggregate Bond Index Portfolio is an “index” fund that seeks to track, before fees and expenses, the total return performance of the U.S. Aggregate Bond Index over the long term.

In seeking to track the performance of the Equity Index and the U.S. Aggregate Bond Index, the Fund and the Portfolio, respectively, employ a sampling strategy, which means that the Fund/Portfolio will not typically purchase all of the securities represented in an Index. Instead, the Fund/Portfolio may purchase a subset of the securities in an Index, or securities SSGA FM considers to be comparable to securities in the applicable Index, in an effort to hold a portfolio of securities with generally the same risk and return characteristics of such Index. The number of holdings in the Fund/Portfolio will be based on a number of factors, including asset size of the Fund/Portfolio. The Adviser generally expects the Fund/Portfolio to hold fewer than the total number of securities in the Equity Index and the U.S. Aggregate Bond Index, but reserves the right to hold as many securities as it believes necessary to achieve the Fund's/Portfolio's investment objective.

From time to time securities are added to or removed from an Index. The Fund/Portfolio may sell securities that are represented in the Equity Index and the U.S. Aggregate Bond Index, or purchase securities that are not yet represented in the applicable Index, prior to or after their removal or addition to such Index. The Fund/Portfolio may at times purchase or sell index futures contracts, or options on those futures, or engage in other transactions involving the use of derivatives, in lieu of investment directly in the securities making up an Index or to enhance the Fund's/Portfolio's replication of the applicable Index return. The Fund/Portfolio might do so, for example, in order to increase its investment exposure pending investment of cash in the securities comprising the Index. Alternatively, the Fund/Portfolio might use futures or options on futures to reduce its investment exposure in situations where it intends to sell a portion of the securities in its portfolio but the sale has not yet been completed. The Fund/Portfolio may also enter into other derivatives transactions, including the use of options or swap transactions, in lieu of investing directly in the securities making up an Index. The

Fund/Portfolio may also, to the extent permitted by applicable law, invest in shares of other registered investment companies whose investment objectives and policies are similar to those of the Fund/Portfolio (including funds advised by the Adviser). The Fund's/Portfolio's return on its equity and fixed income allocations may not match the return of the Equity Index or the U.S. Aggregate Bond Index, respectively.

Principal Risks

Market Risk: The Fund's investments are subject to changes in general economic conditions, general market fluctuations and the risks inherent in investment in securities markets. Investment markets can be volatile and prices of investments can change substantially due to various factors, including, but not limited to, economic growth or recession, changes in interest rates, inflation, changes in the actual or perceived creditworthiness of issuers, and general market liquidity. The Fund is subject to the risk that geopolitical events will disrupt securities markets and adversely affect global economies and markets. Local, regional or global events such as war, military conflicts, acts of terrorism, trade policy changes or disputes, the threat or actual imposition of tariffs, natural disasters, the spread of infectious illness or other public health issues, or other events could have a significant impact on the Fund and its investments.

may extend, which may lock in a below-market interest rate, increase the security's duration and interest rate sensitivity, and reduce the value of the security. Enforcing rights against the underlying assets or collateral may be difficult, and the underlying assets or collateral may be insufficient if the issuer defaults.

Swaps Risk: A swap is a two-party contract that generally obligates the parties to exchange payments based on a specified reference security, basket of securities, security index or index component. Swaps can involve greater risks than direct investment in securities because swaps may be leveraged and are subject to counterparty risk (e.g., the risk of a counterparty's defaulting on the obligation or bankruptcy), credit risk and pricing risk (i.e., swaps may be difficult to value). It may not be possible for the Fund to liquidate a swap position at an advantageous time or price, which may result in significant losses.

rapidly or unexpectedly, including as a result of an asset allocation decision made by the Adviser. In addition, a large number of shareholders collectively may purchase or redeem Fund shares in large amounts rapidly or unexpectedly (collectively, such transactions are referred to as “large shareholder transactions”). Large shareholder transactions could adversely affect the ability of the Fund to conduct its investment program.

Limited Track Record Risk: The Fund has a limited track record and there is no assurance that the Fund will grow quickly. When the Fund's size is small, the Fund may experience low trading volume, which could lead to wider bid/ask spreads. In addition, the Fund may face the risk of being delisted if the Fund does not meet certain conditions of the listing exchange. Any resulting liquidation of the Fund could cause elevated transaction costs for the Fund and negative tax consequences for its shareholders.

Portfolio Turnover Risk: Frequent purchases and sales of portfolio securities may result in higher Fund expenses and may result in more significant distributions of short-term capital gains to investors, which are taxed to individuals as ordinary income.

Risk of Investment in Other Pools: If the Fund invests in another pooled investment vehicle (e.g., a mutual fund or exchange-traded fund), it is exposed to the risk that the other pool will not perform as expected and is exposed indirectly to all of the risks applicable to an investment in such other pool. The investment policies of the other pool may not be the same as those of the Fund; as a result, an investment in the other pool may be subject to additional or different risks than those to which the Fund is typically subject. The Fund bears its proportionate share of the fees and expenses of any pool in which it invests. The Adviser or an affiliate may serve as investment adviser to a pool in which the Fund may invest, leading to potential conflicts of interest. It is possible that other clients of the Adviser or its affiliates will purchase or sell interests in a pool sponsored or managed by the Adviser or its affiliates at prices and at times more favorable than those at which the Fund does so.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund's returns from year-to-year and by showing how the Fund's average annual returns for the periods indicated compared with those of the Index. The bar chart shows how the Class K shares' returns have varied for each full calendar year shown. Except for differences in returns resulting from differences in fees and expenses, all share classes would have substantially similar returns because all share classes invest in the same portfolio of securities. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (800) 997-7327 or by visiting our website at www.ssga.com.

Annual Total Return (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	5.66%	Q1 2024
Lowest Quarterly Return	0.32%	Q4 2024

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Since Inception
	One Year	10/27/2023
Class K
Return Before Taxes	13.99 %	24.53 %
Return After Taxes on Distributions	13.76 %	24.09 %
Return After Taxes on Distributions and Sale of Fund Shares	8.31 %	18.59 %
S&P 500 Index (reflects no deduction for fees, expenses or taxes)	25.02 %	37.33 %
State Street Balanced Composite Index (reflects no deduction for fees, expenses or taxes)	14.48 %	25.08 %

The Fund will make updated performance information, including its current net asset value, available at the Fund's website: www.ssga.com.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

The professionals primarily responsible for the day-to-day management of the Fund are Leo Law and Seamus Quinn.

Leo Law, CFA, is a Principal of the Adviser and a Portfolio Manager in the Investment Solutions Group. He joined the Adviser in 2016.

Seamus Quinn, CFA, CAIA, is a Principal of the Adviser and a Portfolio Manager in the Investment Solutions Group. He joined the Adviser in 2012.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Class K
To establish an account	None
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

Written Requests and Wire Transfers. You may purchase or redeem Fund Shares by written request or wire transfer.

Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Intermediary:

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

Additional Information About Investment Objectives, Principal Strategies and Risks

Investment Objective

Emerging Markets Equity Index Fund

Principal Investment Strategies

In seeking to track the performance of the Index, the Fund employs a sampling strategy, which means that the Fund is not required to purchase all of the securities represented in the Index. Instead, the Fund may purchase a subset of the securities in the Index in an effort to create a portfolio of securities with generally the same risk and return characteristics as those of the Index. The number of holdings in the Fund will be based on a number of factors, including asset size of the Fund. SSGA FM may invest the Fund's assets in a subset of securities in the Index or may invest the Fund's assets in substantially all of the securities represented in the Index, in approximately the same proportions as the Index, but reserves the right to hold as many securities as it believes necessary to achieve the Fund's investment objective. In addition, from time to time stocks are added to or removed from the Index. The Fund may sell securities that are represented in the Index, or purchase securities that are not yet represented in the Index, in anticipation of their removal from or addition to the Index. Under normal circumstances, the Fund generally invests substantially all, but at least 80%, of its net assets (plus borrowings, if any) in securities included in the Index or in other securities of emerging market companies providing exposure comparable, in the Adviser's view, to securities comprising the Index. An “emerging market company” is any company domiciled or doing a substantial portion of its business in countries represented in the Index at the time of purchase. These securities may be represented by American Depositary Receipts (“ADRs”), Global Depositary Receipts (“GDRs”), Non-Voting Depositary Receipts (“NVDRs”) or Participatory Notes (“P-Notes”). The notional value of the Fund's investments in derivatives or other synthetic instruments that provide exposures comparable, in the judgment of the Adviser, to investments in the Index may be counted toward satisfaction of this 80% policy. The Fund will provide shareholders with at least 60 days' notice prior to any change in this 80% investment policy. The Fund may invest a portion of its assets in cash and cash equivalents, repurchase agreements and money market instruments, such as money market funds (including money market funds advised by the Adviser).

Index comprised companies in the financials and technology sectors, although this may change from time to time. As of February 28, 2025, a significant portion of the Index comprised companies located in China, Taiwan and India and a significant portion of the Index constituents are denominated in Hong Kong Dollars and Taiwan Dollars, although this may change from time to time.

Additional Index Information. The Index's components are reconstituted and rebalanced semi-annually. The Index Provider classifies each issuer in one country. The Index Provider generally determines the country classification of an issuer based on the issuer's country of incorporation and the primary listing of its securities. To the extent that an issuer is incorporated in a different country than the country in which its securities are principally traded, the Index Provider considers the following additional set of criteria to determine the issuer's country classification: (i) the secondary listings of the issuer's securities, if any; (ii) the geographic distribution of the issuer's shareholder base; (iii) the location of the issuer's headquarters; (iv) the geographic distribution of the issuer's operations (in terms of assets and revenues); (v) the issuer's history with respect to these criteria; and (vi) the country in which investors consider the issuer to be most appropriately classified based on communications between the Index Provider and investors.

Balanced Index Fund

Principal Investment Strategies

The Fund employs an indexing investment approach designed to track the performance of two benchmark indexes in a 60%/40% split between equity and fixed-income.

For the 60% equity allocation, the Fund seeks to track, before fees and expenses, the total return performance of the Equity Index, which is designed to measure all U.S. equity issues with readily available prices over the long term. As part of its indexing investment approach, the Fund may purchase securities in their initial public offerings (“IPOs”) to track the Equity Index's constituents.

For the 40% fixed income allocation, the Fund obtains its investment exposure by investing in a mutual fund that seeks to track, before fees and expenses, the total return performance of the U.S. Aggregate Bond Index, which is a benchmark that measures the performance of the U.S. dollar denominated investment grade fixed-rate taxable bond market, over the long term. Fixed income securities comprising the U.S. Aggregate Bond Index may include Treasuries, government-related and corporate securities, MBS (agency fixed-rate pass-throughs), ABS and CMBS (agency and non-agency).

The Fund's investments in fixed-income securities will be achieved primarily through a passive investment approach of investing all or substantially all of its assets allocated to fixed income investments in the Aggregate Bond Index Portfolio, a mutual fund also advised by SSGA FM. The Aggregate Bond Index Portfolio is an “index” fund that seeks to track, before fees and expenses, the total return performance of the U.S. Aggregate Bond Index over the long term.

Dow Jones U.S. Total Stock Market Index Overview. The Equity Index is a market capitalization weighted index which provides a broad-based coverage of the U.S. stock market. The Equity Index represents approximately 98% of the investable U.S. stock market and includes large-, mid-, small-, and micro-cap stocks regularly traded on major securities exchanges such as the New York Stock Exchange and NASDAQ. As of February 28, 2025, the Equity Index is comprised of 3,956 constituents.

Bloomberg U.S. Aggregate Bond Index Overview. The U.S. Aggregate Bond Index is designed to measure the performance of the U.S. dollar denominated investment grade bond market, which includes investment grade government bonds, investment grade corporate bonds, mortgage pass-through securities, commercial mortgage backed securities and other asset backed securities that are publicly for sale in the United States. The securities in the U.S. Aggregate Bond Index must have at least 1 year remaining to maturity and must have $300 million or more of outstanding face value. In addition, the securities must be U.S. dollar denominated, fixed rate, non-convertible, and taxable. Certain types of securities, such as flower bonds, targeted investor notes, and state and local government series bonds are excluded from the U.S. Aggregate Bond Index. As of February 28, 2025, the U.S. Aggregate Bond Index is comprised of 13,723 constituents.

Additional Index Information. The Equity Index and the U.S. Aggregate Bond Index's components are reconstituted and rebalanced semi-annually. Each index provider classifies each issuer in one country. Each index provider generally determines the country classification of an issuer based on the issuer's country of incorporation and the primary listing of its securities. To the extent that an issuer is incorporated in a different country than the country in which its securities are principally traded, each index provider considers the following additional set of criteria to determine the issuer's country classification: (i) the secondary listings of the issuer's securities, if any (ii) the geographic distribution of the issuer's shareholder base (iii) the location of the issuer's headquarters (iv) the geographic distribution of the issuer's operations (in terms of assets and revenues) (v) the issuer's history with respect to these criteria and (vi) the country in which investors consider the issuer to be most appropriately classified based on communications between the applicable index provider and investors.

Additional Information About Risks

The Funds are subject to the following principal risks. The risks are described in alphabetical order and not in the order of importance or potential exposure.

financial institution (or an affiliate of the financial institution) experiences financial difficulties, then the Fund may in certain situations be prevented or delayed from exercising its rights to terminate the investment or transaction, or to realize on any collateral and may result in the suspension of payment and delivery obligations of the parties under such investment or transactions or in another institution being substituted for that financial institution without the consent of the Fund. Further, a Fund may be subject to “bail-in” risk under applicable law whereby, if required by the financial institution's authority, the financial institution's liabilities could be written down, eliminated or converted into equity or an alternative instrument of ownership. A bail-in of a financial institution may result in a reduction in value of some or all of its securities and, if a Fund holds such securities or has entered into a transaction with such a financial security when a bail-in occurs, such Fund may also be similarly impacted.

Currency Risk (principal risk for the Emerging Markets Equity Index Fund). Investments in issuers in different countries are often denominated in currencies other than the U.S. dollar. Changes in the values of those currencies relative to the U.S. dollar may have a positive or negative effect on the values of a Fund's investments denominated in those currencies. The values of other currencies relative to the U.S. dollar may fluctuate in response to, among other factors, interest rate changes, intervention (or failure to intervene) by national governments, central banks, or supranational entities such as the International Monetary Fund, the imposition of currency controls, and other political or regulatory developments. Currency values can decrease significantly both in the short term and over the long term in response to these and other developments. Continuing uncertainty as to the status of the Euro and the Economic and Monetary Union of the European Union (the “EMU”) has created significant volatility in currency and financial markets generally. Any partial or complete dissolution of the EMU, or any continued uncertainty as to its status, could have significant adverse effects on currency and financial markets, and on the values of a Fund's portfolio investments.

Debt Securities Risk (principal risk for the Balanced Index Fund). The values of debt securities may increase or decrease as a result of the following: market fluctuations, changes in interest rates, actual or perceived inability or unwillingness of issuers, guarantors or liquidity providers to make scheduled principal or interest payments or illiquidity in debt securities markets. To the extent that interest rates rise, certain underlying obligations may be paid off substantially slower than originally anticipated and the value of those securities may fall sharply. A rising interest rate environment may cause the value of a Fund's fixed income securities to decrease, an adverse impact on the liquidity of a Fund's fixed income securities, and increased volatility of the fixed income markets. During periods when interest rates are at low levels, a Fund's yield can be low, and a Fund may have a negative yield (i.e., it may lose money on an operating basis). To the extent that interest rates fall, certain underlying obligations may be paid off substantially faster than originally anticipated. If the principal on a debt obligation is prepaid before expected, the prepayments of principal may have to be reinvested in obligations paying interest at lower rates. During periods of falling interest rates, the income received by a Fund may decline. Changes in interest rates will likely have a greater effect on the values of debt securities of longer durations. Returns on investments in debt securities could trail the returns on other investment options, including investments in equity securities. High levels of inflation and/or a significantly changing interest rate environment can lead to heightened levels of volatility and reduced liquidity.

Depositary Receipts Risk (principal risk for the Emerging Markets Equity Index Fund). American Depositary Receipts (“ADRs”) are typically trust receipts issued by a U.S. bank or trust company that evidence an indirect interest in underlying securities issued by a foreign entity. Global Depositary Receipts (“GDRs”), European Depositary Receipts (“EDRs”), and other types of depositary receipts are typically issued by non-U.S. banks or financial institutions to evidence an interest in underlying securities issued by either a U.S. or a non-U.S. entity. Investments in non-U.S. issuers through ADRs, GDRs, EDRs, and other types of depositary receipts generally involve risks applicable to other types of investments in non-U.S. issuers. Investments in depositary receipts may be less liquid and more volatile than the underlying securities in their primary trading market. If a depositary receipt is denominated in a different currency than its underlying securities, the Fund will be subject to the currency risk of both the investment in the depositary receipt and the underlying security. There may be less publicly available information regarding the issuer of the securities underlying a depositary receipt than if those securities were traded directly in U.S. securities markets. Depositary receipts may or may not be sponsored by the issuers of the underlying securities, and information regarding issuers of securities underlying unsponsored depositary receipts may be more limited than for sponsored depositary receipts. The values of depositary receipts may decline for a number of reasons relating to the issuers or sponsors of the depositary receipts, including, but not limited to, insolvency of the issuer or sponsor. Holders of depositary receipts may have limited or no rights to take action with respect to the underlying securities or to compel the issuer of the receipts to take action. The prices of depositary receipts may differ from the prices of securities upon which they are based. To the extent the Fund invests in depositary receipts based on securities included in the Index, such differences in prices may increase index tracking risk.

Emerging Markets Risk (principal risk for the Emerging Markets Equity Index Fund). Investments in emerging markets are generally subject to a greater risk of loss than investments in developed markets. This may be due to, among other things, the possibility of greater market volatility, lower trading volume and liquidity, greater risk of expropriation, nationalization, and social, political and economic instability, greater reliance on a few industries, international trade or revenue from particular commodities, less developed accounting, legal and regulatory systems, increased potential for market manipulation, higher levels of inflation, deflation or currency devaluation, greater risk of market shutdown, and more significant governmental limitations on investment policy as compared to those typically found in a developed market. The Public Company Accounting Oversight Board, which regulates auditors of U.S. public companies, is unable to inspect audit work papers in certain foreign countries. Investors in foreign countries often have limited rights and few practical remedies to pursue shareholder claims, including class actions or fraud claims, and the ability of the U.S. Securities and Exchange Commission, the U.S. Department of Justice and other authorities to bring and enforce actions against foreign issuers or foreign persons is limited. In addition, issuers (including governments) in emerging market countries may have less financial stability than in other countries. The securities of emerging market companies may trade less frequently and in smaller volumes than more widely held securities. Market disruptions or substantial market corrections may limit very significantly the liquidity of securities of certain companies in a particular country or geographic region, or of all companies in the country or region. A Fund may be unable to liquidate its positions in such securities at any time, or at a favorable price, in order to meet the Fund's obligations. There is also the potential for unfavorable action such as embargoes and acts of war. As a result, there will tend to be an increased risk of price volatility in investments in emerging market countries, which may be magnified by currency fluctuations relative to the U.S. dollar. Settlement and asset custody practices for transactions in emerging markets may differ from those in developed markets. Such differences may include possible delays in settlement and certain settlement practices, such as delivery of securities prior to receipt of payment, which increase the likelihood of a “failed settlement.” Failed settlements can result in losses. For these and other reasons, investments in emerging markets are often considered speculative.

Equity Investing Risk. The market prices of equity securities owned by a Fund may go up or down, sometimes rapidly or unpredictably. The value of a security may decline for a number of reasons that may directly relate to the issuer, such as management performance, financial leverage, non-compliance with regulatory requirements, and reduced demand for the issuer's goods or services. The values of equity securities also may decline due to general industry or market conditions that are not specifically related to a particular company, such as real or perceived adverse economic conditions, changes in the general outlook for corporate earnings, changes in interest or currency rates, or adverse investor sentiment generally. In addition, equity markets tend to move in cycles, which may cause stock prices to fall over short or extended periods of time.

Financial Institutions Risk (principal risk for the Emerging Markets Equity Index Fund). Some instruments are issued or guaranteed by financial institutions, such as banks and brokers, or are collateralized by securities issued or guaranteed by financial institutions. Changes in the creditworthiness of any of these institutions may adversely affect the values of instruments of issuers in financial industries. Financial institutions may be particularly sensitive to certain economic factors such as interest rate changes, adverse developments in the real estate market, fiscal and monetary policy and gen

eral economic cycles. Adverse developments in banking and other financial industries may cause a Fund to underperform relative to other funds that invest more broadly across different industries or have a smaller exposure to financial institutions. Other adverse developments that affect financial institutions or the financial services industry generally, or concerns or rumors about any events of these kinds or other similar risks, may reduce liquidity in the market generally or have other adverse effects on the economy or the Fund. In addition, the Fund may not be able to identify all potential solvency or stress concerns with respect to a financial institution or to transfer assets from one bank or financial institution to another in a timely manner in the event such bank or financial institution comes under stress or fails. Changes in governmental regulation and oversight of financial institutions may have an adverse effect on the financial condition or the earnings or operations of a financial institution and on the types and amounts of businesses in which a financial institution may engage. An investor may be delayed or prevented from exercising certain remedies against a financial institution. The amount of a Fund's assets that may be invested in any financial institution, or financial institutions generally, may be limited by applicable law.

Financial Sector Risk. Financial services companies are subject to extensive governmental regulation, which may limit both the amounts and types of loans and other financial commitments they can make, the interest rates and fees they can charge, the scope of their activities, the prices they can charge and the amount of capital they must maintain. Profitability is largely dependent on the availability and cost of capital funds and can fluctuate significantly when interest rates change or due to increased competition. In addition, deterioration of the credit markets generally may cause an adverse impact in a broad range of markets, including U.S. and international credit and interbank money markets generally, thereby affecting a wide range of financial institutions and markets. Certain events in the financial sector may cause an unusually high degree of volatility in the financial markets, both domestic and foreign, and cause certain financial services companies to incur large losses. Securities of financial services companies may experience a dramatic decline in value when such companies experience substantial declines in the valuations of their assets, take action to raise capital (such as the issuance of debt or equity securities), or cease operations. Credit losses resulting from financial difficulties of borrowers and financial losses associated with investment activities can negatively impact the sector. Insurance companies may be subject to severe price competition. Adverse economic, business or political developments could adversely affect financial institutions engaged in mortgage finance or other lending or investing activities directly or indirectly connected to the value of real estate.

Frontier Markets Risks (principal risk for the Emerging Markets Equity Index Fund). Investments in frontier markets may be more volatile and less liquid than investments in more developed markets or in other emerging market countries. Some of these markets may have relatively unstable governments, economies based on only a few industries and securities markets that trade only a limited number of securities. Many frontier markets do not have well-developed regulatory systems and disclosure standards may be less stringent than those of more developed markets. The risks of expropriation, nationalization, and social, political, and economic instability are greater in frontier markets than in more developed markets. These risks, which are characteristic of many emerging markets generally, may be especially heightened in frontier markets, due to political, economic, financial, or other factors.

Futures Contract Risk; Other Exchange-Traded Derivatives Risk. The risk of loss relating to the use of futures contracts and other exchange-traded derivatives is potentially unlimited. The ability to establish and close out positions in futures contracts and other exchange-traded derivatives will be subject to the development and maintenance of a liquid market. There is no assurance that a liquid market on an exchange will exist for any particular futures contract or other exchange-traded derivative or at any particular time. In the event no such market exists for a particular derivative, it might not be possible to effect closing transactions, and the Fund will be unable to terminate the derivative. Certain futures exchanges do not permit trading in particular futures contracts at prices that represent a fluctuation in price during a single day's trading beyond certain set limits. If prices fluctuate during a single day's trading beyond those limits, the Fund could be prevented from promptly liquidating unfavorable positions and thus be subjected to substantial losses. In using futures contracts and other exchange-traded derivatives, the Fund will be reliant on the ability of the Adviser to predict market and price movements correctly; the skills needed to use such derivatives successfully are different from those needed for traditional portfolio management. If the Fund uses futures contracts or other exchange-traded derivatives for hedging purposes, there is a risk of imperfect correlation between movements in the prices of the derivatives and movements in the securities or index underlying the derivatives or movements in the prices of the Fund's investments that are the subject of such hedge. The prices of futures and other exchange-traded derivatives, for a number of reasons, may not correlate perfectly with movements in the securities or index underlying them. For example, participants in the futures markets and in markets for other exchange-traded derivatives are subject to margin deposit requirements. Such requirements may cause investors to take actions with respect to their derivatives positions that they would not otherwise take. The margin requirements in the derivatives markets may be less onerous than margin requirements in the securities markets

in general, and as a result those markets may attract more speculators than the securities markets do. Increased participation by speculators in those markets may cause temporary price distortions. Due to the possibility of price distortion, even a correct forecast of general market trends by the Adviser still may not result in a successful derivatives activity over a very short time period. The risk of a position in a futures contract or other exchange-traded derivative may be very large compared to the relatively low level of margin the Fund is required to deposit. In many cases, a relatively small price movement in a futures contract may result in immediate and substantial loss or gain to the investor relative to the size of a required margin deposit. The Fund will incur brokerage fees in connection with its exchange-traded derivatives transactions. The Fund will typically be required to post margin with its futures commission merchant in connection with its transactions in futures contracts and other exchange-traded derivatives. In the event of an insolvency of the futures commission merchant or a clearing house, the Fund may not be able to recover all (or any) of the margin it has posted with the futures commission merchant, or to realize the value of any increase in the price of its positions, or it may experience a significant delay in doing so. The Fund also may be delayed or prevented from recovering margin or other amounts deposited with a futures commission merchant or futures clearinghouse. The Commodity Futures Trading Commission (“CFTC”), certain foreign regulators and many futures exchanges have established (and continue to evaluate and revise) speculative position limits, referred to as “position limits,” on the maximum net long or net short positions which any person or entity may hold or control in particular options and futures contracts. In addition, U.S. federal position limits apply to swaps that are economically equivalent to futures contracts on certain agricultural, metals and energy commodities. All positions owned or controlled by the same person or entity, even if in different accounts, must be aggregated for purposes of determining whether applicable position limits have been exceeded, unless an exemption applies. It is possible that positions of different clients managed by the Investment Manager and its affiliates may be aggregated for this purpose. Therefore, trading decisions of the Investment Manager may have to be modified and positions held by the Fund may have to be liquidated in order to avoid exceeding such limits. The modification of investment decisions or the elimination of open positions, if it occurs, may adversely affect the performance of the Fund. A violation of position limits could also lead to regulatory action materially adverse to the Fund's investment strategy. The Fund may also be affected by other regimes, including those of the European Union and United Kingdom, and trading venues that impose position limits on commodity derivative contracts.

Futures contracts and other exchange-traded derivatives traded on markets outside the U.S. are not generally subject to the same level of regulation by the CFTC or other U.S. regulatory entities as contracts traded in the U.S., including without limitation as to the execution, delivery, and clearing of transactions. U.S. regulators neither regulate the activities of a foreign exchange, nor have the power to compel enforcement of the rules of the foreign exchange or the laws of the foreign country in question. Margin and other payments made by a Fund may not be afforded the same protections as are afforded those payments in the U.S., including in connection with the insolvency of an executing or clearing broker or a clearinghouse or exchange. Certain foreign futures contracts and other exchange-traded derivatives may be less liquid and more volatile than U.S. contracts.

Geographic Focus Risk (principal risk for the Emerging Markets Equity Fund). The performance of a fund that invests significantly in one or more countries or geographic regions will be closely tied to market, currency, economic, political, environmental, or regulatory conditions and developments in the countries or regions in which the fund invests, and may be more volatile than the performance of a fund that does not invest significantly in such countries or regions.

ties by the Chinese government could have a significant adverse effect on economic conditions in China, the economic prospects for, and the market prices and liquidity of, the securities of Chinese companies and the payments of dividends and interest by Chinese companies. In addition, expropriation, including nationalization, confiscatory taxation, political, economic or social instability or other developments could adversely affect and significantly diminish the values of the Chinese companies in which a Fund invests. The Chinese economy and financial markets have experienced high levels of growth in recent years; any actual or perceived reduction or curtailment in those levels of growth in the future would likely have a substantial adverse impact on the values of Chinese companies. These factors and others could negatively affect the value and liquidity of the Fund. A Fund may invest in shares of Chinese companies traded on stock markets in Mainland China or Hong Kong. These stock markets have recently experienced high levels of volatility, which may continue in the future. The Hong Kong stock market may behave differently from the Mainland China stock market and there may be little to no correlation between the performance of the Hong Kong stock market and the Mainland China stock market.

The Fund may gain investment exposure to certain Chinese companies through variable interest entity (“VIE”) structures. Such investments are subject to the investment risks associated with the Chinese-based company. The VIE structure enables foreign investors, such as the Fund, to obtain investment exposure to a Chinese company in situations in which the Chinese government has limited or prohibited non-Chinese ownership of such company. The VIE structure does not involve direct equity ownership in a China-based company, but rather involves claims to the China-based company's profits and control of the assets that belong to the China-based company through contractual arrangements. Intervention by the Chinese government with respect to the VIE structure could significantly affect the Chinese operating company's performance and thus, the value of the Fund's investment through a VIE structure, as well as the enforceability of the contractual arrangements of the VIE structure. In the event of such an occurrence, the Fund, as a foreign investor, may have little or no legal recourse. In addition to the risk of government intervention, investments through a VIE structure are subject to the risk that the China-based company (or its officers, directors, or Chinese equity owners) may breach the contractual arrangements, or Chinese law changes in a way that adversely affects the enforceability of the arrangements, or the contracts are otherwise not enforceable under Chinese law, in which case the Fund may suffer significant losses on its investments through a VIE structure with little or no recourse available.

From time to time, certain of the companies in which a Fund may invest may operate in, or have dealings with, countries subject to sanctions or embargoes imposed by the U.S. government and the United Nations and/or in countries identified by the U.S. government as state sponsors of terrorism. One or more of these companies may be subject to constraints under U.S. law or regulations which could negatively affect the company's performance. Additionally, one or more of these companies may suffer damage to its reputation if it is identified as a company which invests or deals with countries which are identified by the U.S. government as state sponsors of terrorism or subject to sanctions. As an investor in such companies, a Fund will be indirectly subject to these risks.

Unexpected political, regulatory and diplomatic events, such as the U.S.-China “trade war” that intensified in 2018, may affect investor and consumer confidence and may adversely impact financial markets and the broader economy, perhaps suddenly and to a significant degree. The current political climate and the further escalation of a trade war between China and the United States may have an adverse effect on both the U.S. and Chinese economies, as each country has recently imposed tariffs on the other country's products. Some U.S. politicians have recently sought to limit certain U.S. investors from investing in Chinese companies. Events such as these and their impact on a Fund are difficult to predict and it is unclear whether further tariffs may be imposed or other escalating actions may be taken in the future.

South Korea. In addition, economic and political developments of South Korean neighbors may have an adverse effect on the South Korean economy. Substantial political tensions exist between North Korea and South Korea and, recently, these political tensions have escalated. The outbreak of hostilities between the two nations, or even the threat of such an outbreak, will likely adversely impact the South Korean economy. In addition, South Korea's economic growth potential has recently been on a decline, mainly because of a rapidly aging population and structural problems. Among these structural concerns are the country's underdeveloped financial markets and a general lack of regulatory transparency. The restructuring of the South Korean economy, including the creation of a mechanism for bankrupt firms to exit the market, remains an important unfinished task. These factors may adversely affect the South Korean economy and cause a diversion of corporate investment to China and other lower wage countries. South Korea's economic growth potential is susceptible to problems from large scale emigration, rigid labor regulations and ongoing labor relations issues.

Taiwan. Taiwan's geographic proximity and history of political contention with China have resulted in ongoing tensions between the two countries. These tensions may materially affect the Taiwanese economy and its securities market. Taiwan's economy is export-oriented, so it depends on an open world trade regime and remains vulnerable to fluctuations in the world economy. Rising labor costs and increasing environmental consciousness have led some labor-intensive industries to relocate to countries with cheaper work forces, and continued labor outsourcing may adversely affect the Taiwanese economy.

Income Risk (principal risk for the Balanced Index Fund). A Fund's income may decline due to falling interest rates or other factors. Issuers of securities held by a Fund may call or redeem the securities during periods of falling interest rates, and the Fund would likely be required to reinvest in securities paying lower interest rates. If an obligation held by a Fund is prepaid, the Fund may have to reinvest the prepayment in other obligations paying income at lower rates. A reduction in the income earned by a Fund may limit the Fund's ability to achieve its objective.

Index Futures Contracts and Related Options (principal risk for the Balanced Index Fund). A Fund may buy and sell futures contracts and options on those futures contracts. An “index futures” contract is a contract to buy or sell units of an index at an agreed price on a specified future date. Depending on the change in value of the Index between the time when a Fund enters into and closes out an index future or option transaction, a Fund realizes a gain or loss. Options and futures transactions involve risks. For example, it is possible that changes in the prices of futures contracts will not correlate precisely with changes in the value of the Index. In those cases, use of futures contracts and related options might decrease the correlation between the return of a Fund and the return of the Index. In addition, a Fund incurs transaction costs in entering into, and closing out, positions in futures contracts and related options. Funds that enter into contracts with counterparties run the risk that the counterparty will be unwilling or unable to make timely settlement payments or otherwise honor its obligations. This risk is typically less for exchange-traded derivatives, such as those a Fund may invest in. These costs typically have the effect of reducing the correlation between the return of a Fund and the return of the Index. Because the market for futures contracts and options may be illiquid, a Fund may have to hold a contract or option when the Adviser would otherwise have closed out the position, or it may only be able to close out at a price lower than what the Adviser believes is the fair value of the contract or option, thereby potentially reducing the return of a Fund.

Indexing Strategy/Index Tracking Risk. Each Fund is managed with an indexing investment strategy, attempting to track the performance of an unmanaged index of securities. Each Fund will seek to replicate Index returns, regardless of the current or projected performance of the Index or of the actual securities comprising the Index. This differs from an actively-managed fund, which typically seeks to outperform a benchmark index. Each Fund generally will buy and will not sell a security included in the Index as long as the security is part of the Index regardless of any sudden or material decline in value or foreseeable material decline in value of the security, even though the Adviser may make a different investment decision for other actively managed accounts or portfolios that hold the security. As a result, a Fund's performance may be less favorable than that of a portfolio managed using an active investment strategy. The structure and composition of the Index will affect the performance, volatility, and risk of the Index (in absolute terms and by comparison with other indices) and, consequently, the performance, volatility, and risk of a Fund. Errors in index data, index computations or the construction of the Index in accordance with its methodology may occur from time to time and may not be identified and corrected by the Index Provider for a period of time or at all, which may have an adverse impact on a Fund and its shareholders. While the Adviser seeks to track the performance of the Index (i.e., achieve a high degree of correlation with the Index), a Fund's return may not match the return of the Index for a number of reasons. For example, the return on the sample of securities purchased by a Fund (or the return on securities not included in the Index) to replicate the performance of the Index may not correlate precisely with the return of the Index. Each Fund incurs a number of operating expenses not applicable to the Index, and incurs costs in buying and selling securities. In addition, a Fund may not be fully invested at times, either as a result of cash flows into or out of the Fund or reserves of cash held by the Fund to meet redemptions. The Adviser may attempt to track the Index return by investing in fewer than all of the securities in the Index, or in some securities not included in the Index, potentially increasing the risk of divergence between a Fund's return and that of the Index. Changes in the composition of the Index and regulatory requirements also may impact a Fund's ability to match the return of the Index. The Adviser may apply one or more “screens” or investment techniques to refine or limit the number or types of issuers included in the Index in which a Fund may invest. Application of such screens or techniques may result in investment performance below that of the Index and may not produce results expected by the Adviser. Index tracking risk may be heightened during times of increased market volatility or other unusual market conditions.

IPO Risk (principal risk for the Balanced Index Fund). Each Fund may at times have the opportunity to invest in securities offered in IPOs. IPOs involve companies that have no public operating history and therefore entail more risk than established public companies. The prices of securities offered in IPOs can have significant volatility and a Fund may lose money on an investment in such securities. IPOs may not be available to a Fund at all times, and a Fund may not always invest in IPOs offered to it. Investments in IPOs may have a substantial beneficial effect on a Fund's investment performance. A Fund's investment return earned during a period of substantial investment in IPOs may not be sustained during other periods when a Fund makes more limited, or no, investments in IPOs. There can be no assurance that the Funds will have the opportunity to invest in IPOs that are made available to other clients of the Adviser.

Large-Capitalization Securities Risk. Securities issued by large-capitalization companies may present risks not present in smaller companies. For example, larger companies may be unable to respond as quickly as smaller and mid-sized companies to competitive challenges or to changes in business, product, financial, or other market conditions. Larger companies may not be able to maintain growth at the high rates that may be achieved by well-managed smaller and mid-sized companies, especially during strong economic periods. Returns on investments in securities of large companies could trail the returns on investments in securities of smaller and mid-sized companies.

Leveraging Risk (principal risk for the Emerging Markets Equity Index Fund). Borrowing transactions, reverse repurchase agreements, certain derivatives transactions, securities lending transactions and other investment transactions such as when-issued, delayed-delivery, or forward commitment transactions may create investment leverage. If a Fund engages in transactions that have a leveraging effect on the Fund's investment portfolio, the value of the Fund will be potentially more volatile and all other risks will tend to be compounded. This is because leverage generally creates investment risk with respect to a larger base of assets than a Fund would otherwise have and so magnifies the effect of any increase or decrease in the value of the Fund's underlying assets. The use of leverage is considered to be a speculative investment practice and may result in losses to a Fund. Certain derivatives have the potential for unlimited loss, regardless of the size of the initial investment. The use of leverage may cause a Fund to liquidate positions when it may not be advantageous to do so to satisfy repayment, interest payment, or margin obligations.

Limited Track Record Risk (principal risk for the Balanced Index Fund). Each Fund has a limited track record and there is no assurance that the Fund will grow quickly. When a Fund's size is small, the Fund may experience low trading volume, which could lead to wider bid/ask spreads. In addition, a Fund may face the risk of being delisted if the Fund does not meet certain conditions of the listing exchange. Any resulting liquidation of a Fund could cause elevated transaction costs for the Fund and negative tax consequences for its shareholders.

Large Transactions Risk (principal risk for the Balanced Index Fund). To the extent a large proportion of the shares of a Fund are highly concentrated or held by a small number of shareholders (or a single shareholder), including funds or accounts over which the Adviser has investment discretion, a Fund is subject to the risk that these shareholders will purchase or redeem Fund shares in large amounts rapidly or unexpectedly, including as a result of an asset allocation decision made by the Adviser. In addition, a large number of shareholders collectively may purchase or redeem Fund shares in large amounts rapidly or unexpectedly (collectively, such transactions are referred to as “large shareholder transactions”). Large shareholder transactions could adversely affect the ability of a Fund to conduct its investment program. For example, they could require a Fund to sell portfolio securities or purchase portfolio securities unexpectedly and incur substantial transaction costs and/or accelerate the realization of taxable income and/or gains to shareholders. The effects of taxable income and/or gains resulting from large shareholder transactions would particularly impact non-redeeming shareholders who do not hold their Fund shares in an IRA, 401(k) plan or other tax-advantaged plan. To the extent that such transactions result in short-term capital gains, such gains will generally be taxed at the ordinary income tax rate for shareholders who hold Fund shares in a taxable account. In addition, a Fund may be required to sell its more liquid portfolio investments to meet a large redemption, in which case a Fund's remaining assets may be less liquid, more volatile, and more difficult to price. A Fund may hold a relatively large proportion of its assets in cash in anticipation of large redemptions, diluting its investment returns. A number of circumstances may cause a Fund to experience large redemptions, such as changes in investors' circumstances; changes in the eligibility criteria for a Fund or share class of the Fund; liquidations, reorganizations, repositionings, or other announced Fund events; or changes in investment objectives, strategies, policies, risks, or investment personnel.

may be subject to wide fluctuations in market value. It may be difficult for a Fund to value illiquid investments accurately. The market for certain investments may become illiquid under adverse market or economic conditions independent of any specific adverse changes in the conditions of a particular issuer. Disposal of illiquid investments may entail registration expenses and other transaction costs that are higher than those for liquid investments. A Fund may seek to borrow money to meet its obligations (including, among other things, redemption obligations) if it is unable to dispose of illiquid investments, resulting in borrowing expenses and possible leveraging of the Fund. In some cases, due to unanticipated levels of illiquidity the Fund may choose to meet its redemption obligations wholly or in part by distributions of assets in-kind.

Due to the interconnectedness of economies and financial markets throughout the world, if the Fund invests in securities of issuers located in or with significant exposure to countries experiencing economic and financial difficulties, the value and liquidity of the Fund's investments may be negatively affected. A widespread outbreak of an infectious illness and efforts to contain its spread, may result in market volatility, inflation, reduced liquidity of certain instruments, disruption in the trading of certain instruments, and systemic economic weakness. The foregoing could impact a Fund and its investments and result in disruptions to the services provided to a Fund by its service providers.

Mid-Capitalization Securities Risk (principal risk for the Emerging Markets Equity Index Fund). The securities of mid-capitalization companies may be more volatile and may involve more risk than the securities of larger companies. These companies may have limited product lines, markets or financial resources, may lack the competitive strength of larger companies, and may depend on a few key employees. In addition, these companies may have been recently organized and may have little or no track record of success. The securities of mid-sized companies may trade less frequently and in smaller volumes than more widely held securities. The prices of these securities may fluctuate more sharply than those of other securities, and a Fund may experience some difficulty in establishing or closing out positions in these securities at prevailing market prices. There may be less publicly available information about the issuers of these securities or less market interest in these securities than in the case of larger companies, both of which can cause significant price volatility. Some securities of mid-sized issuers may be illiquid or may be restricted as to resale. Returns on investments in securities of mid-capitalization companies could trail the returns on investments in securities of larger or smaller companies.

Money Market Fund Investment Risk (principal risk for the Emerging Markets Equity Index Fund). An investment in a money market fund is not a deposit of any bank and is not insured or guaranteed by the FDIC or any other government agency. Certain money market funds seek to preserve the value of their shares at $1.00 per share, although there can be no assurance that they will do so, and it is possible to lose money by investing in such a money market fund. A major or unexpected change in interest rates or a decline in the credit quality of an issuer or entity providing credit support, an inactive trading market for money market instruments, or adverse market, economic, industry, political, regulatory, geopolitical, and other conditions could cause the share price of such a money market fund to fall below $1.00. It is possible that such a money market fund will issue and redeem shares at $1.00 per share at times when the fair value of the money market fund's portfolio per share is more or less than $1.00. The SEC has adopted amendments to money market fund regulation that, among other things, increase the daily and weekly liquid asset requirements. Such amendments may limit the Funds' investment flexibility and reduce its ability to generate returns. None of State Street Corporation, State Street Bank and Trust Company (“State Street”), State Street Global Advisors, Inc. (“SSGA”), SSGA FM or their affiliates (collectively, the “State Street Entities”) guarantee the value of an investment in a money market fund at $1.00 per share. Investors should have no expectation of capital support to a money market fund from the State Street Entities. Other money market funds price and transact at a “floating” NAV that will fluctuate along with changes in the market-based value of fund assets. Shares sold utilizing a floating NAV may be worth more or less than their original purchase price. Recent changes in the regulation of money market funds may affect the operations and structures of money market funds. A money market fund may be permitted or required to impose redemption fees during times of market stress.

Mortgage-Related and Other Asset-Backed Securities Risk (principal risk for the Balanced Index Fund). Investments in mortgage-related and other asset-backed securities are subject to the risk of significant credit downgrades, illiquidity, and defaults to a greater extent than many other types of fixed income investments. The liquidity of mortgage-related and asset-backed securities may change over time. Mortgage-related securities represent a participation in, or are secured

by, mortgage loans. Other asset-backed securities are typically structured like mortgage-related securities, but instead of mortgage loans or interests in mortgage loans, the underlying assets may include, for example, items such as motor vehicle installment sales or installment loan contracts, leases on various types of real and personal property, and receivables from credit card agreements. During periods of falling interest rates, mortgage-related and other asset-backed securities, which typically provide the issuer with the right to prepay the security prior to maturity, may be prepaid, which may result in a Fund having to reinvest the proceeds in other investments at lower interest rates. During periods of rising interest rates, the average life of mortgage-related and other asset-backed securities may extend because of slower-than expected principal payments. This may lock in a below market interest rate, increase the security's duration and interest rate sensitivity, and reduce the value of the security. As a result, mortgage-related and other asset-backed securities may have less potential for capital appreciation during periods of declining interest rates than other debt securities of comparable maturities, although they may have a similar risk of decline in market values during periods of rising interest rates. Prepayment rates are difficult to predict and the potential impact of prepayments on the value of a mortgage-related or other asset-backed security depends on the terms of the instrument and can result in significant volatility. The price of a mortgage-related or other asset-backed security also depends on the credit quality and adequacy of the underlying assets or collateral. Mortgage-related or other asset-backed securities issued by non-governmental issuers (such as commercial banks, savings and loan institutions, private mortgage insurance companies, mortgage bankers and other secondary market issuers) will generally entail greater credit risk than obligations guaranteed by the U.S. government. Defaults on the underlying assets, if any, may impair the value of a mortgage-related or other asset-backed security. For some asset-backed securities in which a Fund invests, such as those backed by credit card receivables, the underlying cash flows may not be supported by a security interest in a related asset. Moreover, the values of mortgage-related and other asset-backed securities may be substantially dependent on the servicing of the underlying asset pools, and are therefore subject to risks associated with the negligence or malfeasance by their servicers and to the credit risk of their servicers. In certain situations, the mishandling of related documentation may also affect the rights of securities holders in and to the underlying collateral. There may be legal and practical limitations on the enforceability of any security interest granted with respect to underlying assets, or the value of the underlying assets, if any, may be insufficient if the issuer defaults.

Non-U.S. Securities Risk (principal risk for the Emerging Markets Equity Index Fund). Investments in securities of non-U.S. issuers (including depositary receipts) entail risks not typically associated with investing in securities of U.S. issuers. Similar risks may apply to securities traded on a U.S. securities exchange that are issued by entities with significant exposure to non-U.S. countries. In certain countries, legal remedies available to investors may be more limited than those available with regard to U.S. investments. Because non-U.S. securities are typically denominated and traded in currencies other than the U.S. dollar, the value of the Fund's assets, to the extent they are non-U.S. dollar denominated, may be affected favorably or unfavorably by currency exchange rates, exchange control regulations, and restrictions or prohibitions on the repatriation of non-U.S. currencies. Income and gains with respect to investments in certain countries may be subject to withholding and other taxes. There may be less information publicly available about a non-U.S. entity than about a U.S. entity, and many non-U.S. entities are not subject to accounting, auditing, and financial reporting standards, regulatory framework and practices comparable to those in the United States. The securities of some non-U.S. entities are less liquid and at times more volatile than securities of comparable U.S. entities, and could become subject to sanctions or embargoes that adversely affect a Fund's investment. Non-U.S. transaction costs, such as brokerage commissions and custody costs may be higher than in the U.S. In addition, there may be a possibility of nationalization or expropriation of assets, imposition of currency exchange controls, confiscatory taxation, and diplomatic developments that could adversely affect the values of a Fund's investments in certain non-U.S. countries. Investments in securities of non-U.S. issuers also are subject to foreign political and economic risk not associated with U.S. investments, meaning that political events (civil unrest, national elections, changes in political conditions and foreign relations, imposition of exchange controls and repatriation restrictions), social and economic events (labor strikes, rising inflation) and natural disasters occurring in a country where a Fund invests could cause the Fund's investments to experience gains or losses. In addition, the threat of or actual imposition of tariffs may adversely impact the price of non-U.S. securities.

Portfolio Turnover Risk (principal risk for the Balanced Index Fund). A Fund may engage in frequent trading of its portfolio securities. Fund turnover generally involves a number of direct and indirect costs and expenses to a Fund, including, for example, brokerage commissions, dealer mark-ups and bid/asked spreads, and transaction costs on the sale of securities and reinvestment in other securities. The costs related to increased portfolio turnover have the effect of reducing a Fund's investment return, and the sale of securities by the Fund may result in the realization of taxable capital gains, including short-term capital gains.

Risk of Investment in Other Pools. If a Fund invests in another pooled investment vehicle (e.g., a mutual fund or exchange-traded fund), it is exposed to the risk that the other pool will not perform as expected. A Fund is exposed indirectly to all of the risks applicable to an investment in such other pool. In addition, lack of liquidity in the underlying pool could result in its value being more volatile than the underlying portfolio of securities, and may limit the ability of a Fund to sell or redeem its interest in the pool at a time or at a price it might consider desirable. The investment policies and limitations of the other pool may not be the same as those of the Fund; as a result, the Fund may be subject to additional or different risks, or may achieve a reduced investment return, as a result of its investment in another pool. If a pool is an exchange-traded fund or other product traded on a securities exchange or otherwise actively traded, its shares may trade at a premium or discount to their NAV, an effect that might be more pronounced in less liquid markets. A Fund bears its proportionate share of the fees and expenses of any pool in which it invests. The Adviser or an affiliate may serve as investment adviser to a pool in which the Fund may invest, leading to potential conflicts of interest. For example, the Adviser or its affiliates may receive fees based on the amount of assets invested in the pool. Investment by a Fund in the pool may be beneficial to the Adviser or an affiliate in the management of the pool, by helping to achieve economies of scale or enhancing cash flows. Due to this and other factors, the Adviser may have an incentive to invest a Fund's assets in a pool sponsored or managed by the Adviser or its affiliates in lieu of investments by the Fund directly in portfolio securities, or may have an incentive to invest in the pool over a pool sponsored or managed by others. Similarly, the Adviser may have an incentive to delay or decide against the sale of interests held by a Fund in a pool sponsored or managed by the Adviser or its affiliates. It is possible that other clients of the Adviser or its affiliates will purchase or sell interests in a pool sponsored or managed by the Adviser or its affiliates at prices and at times more favorable than those at which a Fund does so.

Settlement Risk (principal risk for the Emerging Markets Equity Index Fund). Markets in different countries have different clearance and settlement procedures and in certain markets there have been times when settlements have been unable to keep pace with the volume of transactions. Delays in settlement may increase credit risk to a Fund, limit the ability of a Fund to reinvest the proceeds of a sale of securities, hinder the ability of a Fund to lend its portfolio securities, and potentially subject a Fund to penalties for its failure to deliver to on-purchasers of securities whose delivery to a Fund was delayed. Delays in the settlement of securities purchased by a Fund may limit the ability of a Fund to sell those securities at times and prices it considers desirable, and may subject a Fund to losses and costs due to its own inability to settle with subsequent purchasers of the securities from it. A Fund may be required to borrow monies it had otherwise expected to receive in connection with the settlement of securities sold by it, in order to meet its obligations to others. Limits on the ability of the Fund to purchase or sell securities due to settlement delays could increase any variance between the Fund's performance and that of its benchmark index.

Small-, Mid- and Micro-Capitalization Securities Risk (principal risk for the Balanced Index Fund). The securities of small-, mid- and micro-capitalization companies may be more volatile and may involve more risk than the securities of larger companies. These companies may have limited product lines, markets or financial resources, may lack the competitive strength of larger companies, and may depend on a few key employees. In addition, these companies may have been recently organized and may have little or no track record of success. The securities of smaller companies may trade less frequently and in smaller volumes than more widely held securities. The prices of these securities may fluctuate more sharply than those of other securities, and a Fund may experience some difficulty in establishing or closing out positions in these securities at prevailing market prices. There may be less publicly available information about the issuers of these securities or less market interest in these securities than in the case of larger companies, both of which can cause significant price volatility. Some securities of smaller issuers may be illiquid or may be restricted as to resale. A Fund may be unable to liquidate its positions in such securities at any time, or at a favorable price, in order to meet a Fund's obligations. Returns on investments in securities of small-, mid- and micro-capitalization companies could trail the returns on investments in securities of larger companies.

Swaps Risk (principal risk for the Balanced Index Fund). A swap is a two-party contract that generally obligates one party to pay the positive return and the other party to pay the negative return on a specified reference security, basket of securities, security index or index component. Swaps can involve greater risks than direct investment in securities, because

swaps may be leveraged and are subject to counterparty risk (e.g., the risk of a counterparty's defaulting on the obligation or bankruptcy), credit risk and pricing risk (i.e., swaps may be difficult to value). Swaps may also be considered illiquid. It may not be possible for a Fund to liquidate a swap position at an advantageous time or price, which may result in significant losses.

Technology Sector Risk (principal risk for the Emerging Markets Equity Index Fund). A Fund's assets may be focused in the technology sector, which means a Fund will be more affected by the performance of the technology sector than a fund that is more diversified. Market or economic factors impacting technology companies and companies that rely heavily on technological advances could have a major effect on the value of the Fund's investments. The value of stocks of technology companies and companies that rely heavily on technology is particularly vulnerable to rapid changes in technology product cycles, rapid product obsolescence, government regulation and competition, both domestically and internationally, including competition from foreign competitors with lower production costs. Technology companies may have limited product lines, markets, financial resources or personnel. Stocks of technology companies and companies that rely heavily on technology, especially those of smaller, less-seasoned companies, tend to be more volatile than the overall market. Technology companies are heavily dependent on patent and intellectual property rights, the loss or impairment of which may adversely affect profitability. Additionally, companies in the technology sector may face dramatic and often unpredictable changes in growth rates and competition for the services of qualified personnel.

Unconstrained Sector Risk. A Fund may invest a substantial portion of its assets within one or more economic sectors or industries, which may change from time to time. When a Fund focuses its investments in a particular industry or sector, financial, economic, business, and other developments affecting issuers in that industry, market, or economic sector will have a greater effect on the Fund than if it had not focused its assets in that industry, market, or economic sector, which may increase the volatility of the Fund. Any such investment focus may also limit the liquidity of the Fund. In addition, investors may buy or sell substantial amounts of a Fund's shares in response to factors affecting or expected to affect an industry, market, or economic sector in which the Fund focuses its investments, resulting in extreme inflows or outflows of cash into and out of the Fund. Such extreme cash inflows and outflows might affect management of the Fund adversely.

U.S. Government Securities Risk (principal risk for the Balanced Index Fund). U.S. government securities, such as Treasury bills, notes and bonds and mortgage-backed securities guaranteed by the Government National Mortgage Association (“Ginnie Mae”), are supported by the full faith and credit of the United States; others are supported by the right of the issuer to borrow from the U.S. Treasury; others are supported by the discretionary authority of the U.S. government to purchase the agency's obligations; and still others are supported only by the credit of the issuing agency, instrumentality, or enterprise. Although U.S. government-sponsored enterprises such as the Federal Home Loan Mortgage Corporation (“Freddie Mac”) and the Federal National Mortgage Association (“Fannie Mae”) may be chartered or sponsored by Congress, they are not funded by Congressional appropriations, and their securities are not issued by the U.S. Treasury nor supported by the full faith and credit of the U.S. government. There is no assurance that the U.S. government would provide financial support to its agencies and instrumentalities if not required to do so. In addition, certain governmental entities have been subject to regulatory scrutiny regarding their accounting policies and practices and other concerns that may result in legislation, changes in regulatory oversight and/or other consequences that could adversely affect the credit quality, availability, or investment character of securities issued by these entities. The value and liquidity of U.S. government securities may be affected adversely by changes in the ratings of those securities. Securities issued by the U.S. Treasury historically have been considered to present minimal credit risk. The downgrade in the long-term U.S. credit rating by at least two major rating agencies has introduced greater uncertainty about the ability of the U.S. to repay its obligations. Further credit rating downgrades or a U.S. credit default could decrease the value and increase the volatility of a Fund's investments.

Valuation Risk. Certain portfolio holdings may be valued on the basis of factors other than market quotations. This may occur more often in times of market turmoil or reduced liquidity. There are multiple methods that can be used to value a portfolio holding when market quotations are not readily available. The value established for any portfolio holding at a point in time might differ from what would be produced using a different methodology or if it had been priced using market quotations. Portfolio holdings that are valued using techniques other than market quotations, including “fair valued” securities, may be subject to greater fluctuation in their valuations from one day to the next than if market quotations were used. Technological issues or other service disruption issues involving third-party service providers may cause a Fund to value its investments incorrectly. In addition, there is no assurance that a Fund could sell or close out a portfolio position for the value established for it at any time, and it is possible that a Fund would incur a loss because a port

folio position is sold or closed out at a discount to the valuation established by a Fund at that time. Investors who purchase or redeem Fund Shares on days when a Fund is holding fair-valued investments may receive fewer or more shares or lower or higher redemption proceeds than they would have received if the Fund had not fair-valued the holding(s) or had used a different valuation methodology.

When-Issued, TBA and Delayed Delivery Securities Risk (principal risk for the Balanced Index Fund). A Fund may purchase securities on a when-issued, TBA or delayed delivery basis and may purchase securities on a forward commitment basis. The purchase price of the securities is typically fixed at the time of the commitment, but delivery and payment can take place a month or more after the date of the commitment. The prices of the securities so purchased or sold are subject to market fluctuations. At the time of delivery of the securities, the value may be more or less than the purchase or sale price. Purchase of securities on a when-issued, TBA, delayed delivery, or forward commitment basis may give rise to investment leverage, and may result in increased volatility of a Fund's net asset value. Default by, or bankruptcy of, a counterparty to a when-issued, TBA or delayed delivery transaction would expose a Fund to possible losses because of an adverse market action, expenses or delays in connection with the purchase or sale of the pools specified in such transaction. The Financial Industry Regulatory Authority, Inc. (“FINRA”) imposes mandatory margin requirements for certain types of when-issued, delayed delivery or forward commitment transactions (including TBA transactions), with limited exceptions. Such transactions require mandatory collateralization which may increase the cost of such transactions and impose added operational complexity.

Additional Information About Non-Principal Investment Strategies and Risks

against, or security breakdowns of, a Fund, the Adviser, or a custodian, transfer agent, or other affiliated or third-party service provider may adversely affect a Fund or its shareholders. For instance, cyber-attacks or technical malfunctions may interfere with the processing of shareholder or other transactions, affect a Fund's ability to calculate its NAV, cause the release of private shareholder information or confidential Fund information, impede trading, cause reputational damage, and subject a Fund to regulatory fines, penalties or financial losses, reimbursement or other compensation costs, and additional compliance costs. Cyber-attacks or technical malfunctions may render records of Fund assets and transactions, shareholder ownership of Fund Shares, and other data integral to the functioning of a Fund inaccessible or inaccurate or incomplete. A Fund may also incur substantial costs for cybersecurity risk management in order to prevent cyber incidents in the future. A Fund and its shareholders could be negatively impacted as a result. While the Adviser has established business continuity plans and systems designed to minimize the risk of cyber-attacks through the use of technology, processes and controls, there are inherent limitations in such plans and systems, including the possibility that certain risks have not been identified, given the evolving nature of this threat. The use of artificial intelligence (“AI”) and machine learning could exacerbate these risks or result in cyber security incidents that implicate personal data. Each Fund relies on third-party service providers for many of its day-to-day operations, and will be subject to the risk that the protections and protocols implemented by those service providers will be ineffective to protect the Fund from cyber-attack. The Adviser does not control the cybersecurity plans and systems put in place by third-party service providers, and such third-party service providers may have limited indemnification obligations to the Adviser or the Funds. Similar types of cybersecurity risks or technical malfunctions also are present for issuers of securities in which each Fund invests, which could result in material adverse consequences for such issuers, and may cause a Fund's investment in such securities to lose value.

Money Market Fund Investment Risk (risk for the Balanced Index Fund). An investment in a money market fund is not a deposit of any bank and is not insured or guaranteed by the FDIC or any other government agency. Certain money market funds seek to preserve the value of their shares at $1.00 per share, although there can be no assurance that they will do so, and it is possible to lose money by investing in such a money market fund. A major or unexpected change in interest rates or a decline in the credit quality of an issuer or entity providing credit support, an inactive trading market for money market instruments, or adverse market, economic, industry, political, regulatory, geopolitical, and other conditions could cause the share price of such a money market fund to fall below $1.00. It is possible that such a money market fund will issue and redeem shares at $1.00 per share at times when the fair value of the money market fund's portfolio per share is more or less than $1.00. The SEC has adopted amendments to money market fund regulation that, among other things, increase the daily and weekly liquid asset requirements. Such amendments may limit the Funds' investment flexibility and reduce its ability to generate returns. None of the State Street Entities guarantee the value of an investment in a money market fund at $1.00 per share. Investors should have no expectation of capital support to a money market fund from State Street Entities. Other money market funds price and transact at a “floating” NAV that will fluctuate along with changes in the market-based value of fund assets. Shares sold utilizing a floating NAV may be worth more or less than their original purchase price. Recent changes in the regulation of money market funds may affect the operations and structures of money market funds. A money market fund may be permitted or required to impose redemption fees during times of market stress.

voted upon. Efforts to recall such securities promptly may be unsuccessful, especially for foreign securities or thinly traded securities. Securities lending involves the risk that the Fund may lose money because the borrower of the loaned securities fails to return the securities in a timely manner or at all. Should the borrower of the securities fail financially, a Fund may experience delays in recovering the securities or exercising its rights in the collateral. Loans are made only to borrowers that are deemed by the securities lending agent to be of good financial standing. In a loan transaction, a Fund will also bear the risk of any decline in value of securities acquired with cash collateral. Each Fund expects to invest cash collateral in a pooled investment vehicle advised by the Adviser (e.g., a mutual fund or exchange-traded fund). With respect to index funds, to the extent the collateral provided or investments made with cash collateral differ from securities included in the relevant Index, such collateral or investments may have a greater risk of loss than the securities included in the Index. In addition, a Fund will be subject to the risk that any income generated by reinvesting cash collateral is lower than any fees the Fund has agreed to pay a borrower.

Portfolio Holdings Disclosure

The Funds' portfolio holdings disclosure policy is described in the Statement of Additional Information (“SAI”).

Management and Organization

Investment Adviser

SSGA FM serves as the investment adviser to each Fund pursuant to an investment advisory agreement (“Investment Advisory Agreement”) between the Trust and the Adviser, and, subject to the oversight of the Board, is responsible for the investment management of each Fund. The Adviser provides an investment management program for each Fund and manages the investment of each Fund's assets. In addition, the Adviser provides administrative, compliance and general management services to each Fund. The Adviser is a wholly-owned subsidiary of State Street Global Advisors, Inc., which itself is a wholly-owned subsidiary of State Street Corporation. The Adviser is registered with the U.S. Securities and Exchange Commission (“SEC”) under the Investment Advisers Act of 1940, as amended. The Adviser and certain other affiliates of State Street Corporation make up SSGA. SSGA is one of the world's largest institutional money managers and the investment management arm of State Street Corporation. As of December 31, 2024, the Adviser managed approximately $1.11 trillion in assets and SSGA managed approximately $4.72 trillion in assets. The Adviser's principal business address is One Iron Street, Boston, Massachusetts 02210.

For the fiscal year ended December 31, 2024, the Emerging Markets Equity Index Fund's effective management fee paid was 0.00%, and the Balanced Index Fund's effective management fee paid was 0.00%.

Each Fund has entered into an investment advisory agreement with the Adviser, pursuant to which the Adviser will manage the Fund's assets for compensation paid at the annual rate, set forth below, of the Fund's average daily net assets.

Emerging Markets Equity Index Fund	0.08%
Balanced Index Fund	0.05%

Total Annual Fund Operating Expense Waiver. SSGA FM, as the investment adviser to each Fund, is contractually obligated, through April 30, 2026, (i) to waive up to the full amount of the advisory fee payable by a Fund, and/or (ii) to reimburse a Fund to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, extraordinary expenses, acquired fund fees and expenses (Emerging Markets Equity Index Fund only), any class-specific expenses, such as distribution, shareholder servicing, and sub-transfer agency fees) exceed 0.074% of average daily net assets on an annual basis for the Emerging Markets Equity Index Fund and 0.05% of average daily net assets on an annual basis for the Balanced Index Fund. This waiver and/or reimbursement arrangement may not be terminated prior to April 30, 2026 except with approval of the Funds' Board of Trustees.

A discussion regarding the Board's consideration of the Emerging Markets Equity Index Fund's Investment Advisory Agreement is provided in the Emerging Markets Equity Index Fund's Semi-Annual Report to Shareholders for the period ended June 30, 2024.

A discussion regarding the Board's consideration of the Balanced Index Fund's Investment Advisory Agreement is provided in the Balanced Index Fund's Annual Report to Shareholders for the period ended December 31, 2024.

The Adviser manages the Funds using a team of investment professionals. The team approach is used to create an environment that encourages the flow of investment ideas. The portfolio managers within the team work together in a cohesive manner to develop and enhance techniques that drive the investment process for the respective investment strategy. This approach requires portfolio managers to share a variety of responsibilities, including investment strategy and analysis, while retaining responsibility for the implementation of the strategy within any particular portfolio. The approach also enables the team to draw upon the resources of other groups within SSGA. The portfolio management team is overseen by SSGA's internal governance.

The professionals primarily responsible for the day-to-day management of the Funds include the following:

Portfolio Managers	Portfolios
Thomas Coleman and Olga Winner	Emerging Markets Equity Index Fund
Leo Law and Seamus Quinn	Balanced Index Fund

Thomas Coleman, CFA, is a Vice President of SSGA and the Adviser and a Senior Portfolio Manager in the Systematic Equity Group. Within this group, Mr. Coleman is the Emerging Markets Strategy leader and, as such, he is responsible for the management of a variety of commingled, segregated, and exchange traded products benchmarked to international indices, including MSCI Emerging Markets and ACWI indices, as well as S&P Emerging Markets indices. Mr. Coleman is also responsible for domestic strategies benchmarked to Russell, Standard & Poor's, and NASDAQ indices. Prior to assuming his current role in April 2004, he managed SSGA's International Structured Products Group Operations Team. Mr. Coleman holds a Bachelor of Science in Finance and Accounting from Boston College and a Master of Business Administration from Babson College. He also earned the Chartered Financial Analyst (CFA) designation and is a member of CFA Society Boston, Inc.

Leo Law, CFA, is a Principal of SSGA and the Adviser and a Portfolio Manager in the Investment Solutions Group (ISG). He is responsible for the portfolio management of several investment strategies, including strategic and tactical global asset allocation. He is also actively involved in the business development of SSGA's model portfolio and defined contribution research. Prior to joining SSGA in 2016, Mr. Law worked as a portfolio analyst at Manulife Asset Management and a derivative analyst at Sun Life Financial, conducting industry wide fundamental research and implementing derivatives strategy to manage variable annuity products. Mr. Law holds a Bachelor of Science degree in Finance with a minor in Mathematics from Boston College. He earned the Chartered Financial Analyst (CFA) and Financial Risk Manager designations. He is a member of the CFA Institute and CFA Society Boston, Inc.

Seamus Quinn, CFA, CAIA, is a Principal of SSGA and the Adviser and a Portfolio Manager in the Investment Solutions Group (ISG). He is responsible for the development and investment management of a variety of customized multi-asset class portfolios, including strategic, tactical, and exposure management strategies. Mr. Quinn joined SSGA in 2012 and has been part of ISG since 2017. Prior to joining ISG, Mr. Quinn was a portfolio analyst in the Fixed Income Operations team. Prior to his role at SSGA, Mr. Quinn worked at State Street Corporation as a fund accountant. Mr. Quinn holds a Bachelor of Science degree in Finance from the University of Massachusetts and a Master of Science in Finance from the Carroll School of Management at Boston College. He has earned the Chartered Financial Analyst (CFA) and the Chartered Alternative Investment Analyst (CAIA) designations and is a member of the CFA Institute, CFA Society Boston, Inc., and the CAIA Association.

Additional information about the portfolio managers' compensation, other accounts managed by the portfolio managers, and the portfolio managers' ownership of the Funds is available in the SAI.

Other Fund Services

The Administrator, Sub-Administrator and Custodian

The Adviser serves as administrator of each Fund. The amount of the fee paid to the Adviser for administrative services may vary by share class. Each Fund currently pays the Adviser an administrative fee at the annual rate of 0.05% with respect to each of its share classes. State Street, a subsidiary of State Street Corporation, serves as sub-administrator and custodian for the Funds. The Adviser and the Funds each bear a portion of the fee paid to State Street for providing sub-administration and custodian services with respect to the Funds.

The Transfer Agent and Dividend Disbursing Agent

SS&C GIDS, Inc. is the Funds' transfer agent and dividend disbursing agent (the “Transfer Agent”).

The Distributor

State Street Global Advisors Funds Distributors, LLC serves as the Funds' distributor (“SSGA FD”) pursuant to the Distribution Agreement between SSGA FD and the Trust.

Additional Information

Shareholder Information

Determination of Net Asset Value

Each Fund determines its NAV per share once each business day as of the scheduled close of regular trading on the New York Stock Exchange (the “NYSE”). Pricing does not occur on NYSE holidays. A business day is one on which the NYSE is open for regular trading. The Federal Reserve is closed on certain holidays on which the NYSE is open. These holidays are Columbus Day and Veterans Day. On these holidays, you will not be able to purchase shares by wiring Federal Funds because Federal Funds wiring does not occur on days when the Federal Reserve is closed. In unusual circumstances, such as an emergency or an unscheduled close or halt of trading on the NYSE, the time at which share prices are determined may be changed. The NAV per share is based on the market value of the investments held in a Fund. The NAV of each class of a Fund's Shares is calculated by dividing the value of the assets of the Fund attributable to that class less the liabilities of the Fund attributable to that class by the number of shares in the class outstanding.As noted in this Prospectus, each Fund may invest in securities listed on foreign exchanges, or otherwise traded in a foreign market, and those securities may trade on weekends or other days when each Fund does not price its shares. Consequently, the NAV of each Fund's Shares may change on days when shareholders are not able to purchase or redeem the Fund's Shares. Purchase and redemption orders for Fund Shares are processed, respectively, at the NAV next determined after the Fund accepts a purchase order or receives a redemption request in good form. Each Fund values each security or other investment pursuant to guidelines adopted by the Board. The Board has appointed the Adviser as the valuation designee to fair value securities or other investments pursuant to procedures approved by the Funds' Board, under certain limited circumstances. For example, fair value pricing may be used when market quotations are not readily available or reliable, such as when (i) trading for a security is restricted; or (ii) a significant event, as determined by the Adviser, that may affect the value of one or more securities or other investments held by a Fund occurs after the close of a related exchange but before the determination of a Fund's NAV. Attempts to determine the fair value of securities or other investments introduce an element of subjectivity to the pricing of securities or other investments. As a result, the price of a security or other investment determined through fair valuation techniques may differ from the price quoted or published by other sources and may not accurately reflect the price a Fund would have received had it sold the investment. To the extent that a Fund invests in the shares of other registered open-end investment companies that are not traded on an exchange (mutual funds), such shares are valued at their published NAVs per share as reported by the funds. The prospectuses of these funds explain the circumstances under which the funds will use fair value pricing and the effects of using fair value pricing.

Investing in State Street Institutional Investment Trust Shares

Purchasing Shares

The Funds offer one class of shares through this Prospectus: Class K shares, available to you subject to the eligibility requirements set forth below. All classes of the Funds share the same investment objective and investments, but the different share classes have different expense structures and eligibility requirements. You should choose the class with the expense structure that best meets your needs for which you are eligible. In choosing a share class, you should consider the amount you plan to invest. Your investment professional can help you choose the share class that best suits your investment needs.

The chart below summarizes the features of the share class. This chart is only a general summary, and you should read the description of each Fund's expenses in their respective Fund Summaries in this Prospectus.

Any applicable minimum purchase amount may be waived for specific investors or types of investors, including, without limitation, retirement plans, employees of State Street Corporation and its affiliates and their family. In the case of shareholders purchasing shares through a Financial Intermediary, the minimum purchase amount may be applied at the level of the Financial Intermediary.

	Class K
Availability	Limited to certain investors, including certain qualified recordkeepers, financial institutions and employer- sponsored retirement plans.
Minimum Initial Investment	None.
Maximum Investment	None.
Initial (Front-End) Sales Charge	None. Entire purchase price is invested in shares of a Fund.
Deferred (CDSC) Sales Charge	None.
Distribution and Service (Rule 12b-1) Fees	None.

Class K

Class K shares are available to the following categories of investors:

Banks, broker-dealers and other financial institutions (including registered investment advisers and financial planners) purchasing Fund Shares on behalf of their clients in:

•

Discretionary and non-discretionary advisory programs;

•

Fund "supermarkets";

•

Asset allocation programs;

•

Other programs in which the client pays an asset-based fee for advice or for executing transactions in Fund Shares or for otherwise participating in the program; or

•

Certain other investment programs that do not charge an asset-based fee;

Qualified recordkeepers with an applicable agreement maintained with SSGA FD;

Endowments and foundations, and defined contribution, defined benefit, and other employer-sponsored employee benefit plans, whether or not qualified under the Code;

Certain other registered open-end investment companies whose shares are distributed by SSGA FD;

Qualified state tuition plans described in Section 529 of the Code and donor-advised charitable gift funds (subject to all applicable terms and conditions);

Health Savings Accounts under Section 223 of the Code if such accounts are maintained by the Fund at an omnibus level;

Collective investment trusts.

There is no minimum investment for Class K shares.

How to Initiate a Purchase Request

Investing in the State Street Funds Through a Financial Intermediary

Account Applications and Other Documents. You may find many of the forms necessary to open an account online or by calling or writing to the State Street Funds. See Contacting the State Street Funds.

Please be sure to check Exchanging Shares and Frequent-Trading Limits below.

How to Pay for a Purchase

By Check. You may send a check to make initial or additional purchases to your fund account. Make your check payable to “State Street Funds” and include the appropriate fund name and account number (e.g., “State Street Emerging Markets Equity Index Fund—a/c #xxx”) in the memo section of the check.

Trade Dates-Purchases

If your purchase request is not in good order, it may be rejected.

For further information about purchase transactions, consult our website at www.ssga.com or see Contacting the State Street Funds.

Other Purchase Policies You Should Know

Redeeming Shares

By Telephone. You may call the State Street Funds to request a redemption of shares. See Contacting the State Street Funds.

By Mail. You may send a written request to the State Street Funds to redeem from a Fund account or to make an exchange. See Contacting the State Street Funds.

Please be sure to check Exchanging Shares and Frequent-Trading Limits below.

Trade Date-Redemptions

The trade date for any redemption request received in good order will depend on the day and time the State Street Funds receive your request in good order and the manner in which you are redeeming.

How to Receive Redemption Proceeds

Other Redemption Policies that You Should Know

Address Changes. If your address of record has been changed within thirty (30) days of the redemption request, the request must be in writing and bear a medallion guarantee.

Significant/Unusual Economic or Market Activity. During periods of significant or unusual economic or market activity, you may encounter delays attempting to give instructions by phone.

Exchanging Shares

An exchange occurs when you use the proceeds from the redemption of shares of one State Street Fund to simultaneously purchase shares of a different State Street Fund. Exchanges may be made within the same class (i.e. Class K shares for Class K shares). Class N shares are also exchangeable for other share classes of State Street Funds and would be subject to the conditions for investing in the other class of shares described in the applicable prospectus. The account holding the original shares must be registered in the same name as the account holding the new shares received in the exchange. You may make exchange requests by telephone, or by mail. See Purchasing Shares and Redeeming Shares above.

Frequent-Trading Limits

Fund for a period of time. A State Street Fund has discretion to determine that action is not necessary if it determines that a pattern of trading is not abusive or harmful to the affected Fund in a material way. Fund size and/or transaction size may be considered in evaluating any roundtrip transaction.

As a means to protect each State Street Fund and its shareholders from Excessive Trading:

•

The State Street Funds' distributor has detailed procedures that document the transparency oversight and monitoring processes performed by the State Street Funds' transfer agent.

Service Options

Dividend and Capital Gain Distribution Option

Please refer to Dividends, Distributions and Tax Considerations below for additional information.

Automatic Withdrawal Plan

Telephone Redemptions and Exchanges

Automatic Investment Plan

Additional Shareholder Information

Account Transfers

Responsibility for Fraud

Right to Change Policies

In addition to the rights expressly stated elsewhere in this Prospectus, the State Street Funds reserve the right, in the future, to:

Alter, add, or discontinue any conditions of purchase (including eligibility requirements), redemption, exchange, service, or privilege at any time;

Accept initial purchases by telephone;

Alter, impose, discontinue, or waive any redemption fee, account service fee, or other fees charged to a group of shareholders; and

Unclaimed Property

encourage you to contact the financial intermediary regarding applicable state unclaimed property laws. The Funds, the transfer agent and the distributor will not be liable to shareholders or their representatives for good faith compliance with state unclaimed property laws. Please check your state's unclaimed or abandoned property website for specific information.

Dividends, Distributions and Tax Considerations

Distribution Options. You can choose from four different distribution options as indicated on the application:

•

Income-Earned Option—Capital gain distributions will be automatically reinvested, but a check, direct deposit or wire will be sent for each dividend distribution.

•

Cash Option—A check, wire or direct deposit will be sent for each dividend and capital gain distribution.

•

Direct Dividends Option—Dividends and capital gain distributions will be automatically invested in another identically registered State Street Fund of the same share class.

Delivery of Documents to Accounts Sharing an Address

Tax Considerations

Each Fund has elected to be treated as a regulated investment company and intends each year to qualify and to be eligible to be treated as such. A regulated investment company generally is not subject to tax at the corporate level on income and gains that are timely distributed to shareholders. In order to qualify and be eligible for treatment as a regulated investment company, a Fund must, among other things, satisfy diversification, 90% gross income and distribution requirements. A Fund's failure to qualify as a regulated investment company would result in corporate level taxation, and consequently, a reduction in income available for distribution to shareholders.

For U.S. federal income tax purposes, distributions of investment income generally are taxable to you as ordinary income. Taxes on distributions of capital gains generally are determined by how long a Fund owned (or is deemed to have owned) the investments that generated them, rather than how long you have owned your Fund Shares. Distributions of net capital gains (that is, the excess of net long-term capital gains over net short-term capital losses) from the sale of investments that a Fund owned (or is deemed to have owned) for more than one year that are properly reported by a Fund as capital gain dividends generally will be treated as long-term capital gain includible in your net capital gain and taxed to individuals at reduced rates. Distributions of gains from investments that a Fund owned (or is deemed to have owned) for one year or less generally will be taxable to you as ordinary income. Distributions of investment income properly reported by a Fund as derived from “qualified dividend income,” which will not include income from a Fund's portfolio securities on loan, are taxed to individuals at the rates applicable to net capital gain, provided holding period and other requirements are met by both the shareholder and a Fund. Distributions are taxable to you even if they are paid from income or gains earned by a Fund before your investment (and thus were included in the price you paid for your shares). Distributions may also be subject to state and local taxes and are taxable whether you receive them in cash or reinvest them in additional shares. Distributions in excess of a Fund's current and accumulated earnings and profits are treated as a return of capital to the extent of your basis in a Fund's shares, and, in general, as capital gain thereafter.

Each Fund's income from or the proceeds of dispositions of its investments in non-U.S. assets may be subject to non-U.S. withholding or other taxes, which will reduce the yield on those investments. In certain instances, a Fund may be entitled to elect to pass through to its shareholders a credit (or deduction, for a shareholder that itemizes deductions and so chooses) for foreign taxes (if any) borne with respect to foreign securities income earned by a Fund. If a Fund so elects, shareholders will include in gross income from foreign sources their pro rata shares of such taxes, if any, treated as paid by a Fund. There can be no assurance that a Fund will make such election, even if it is eligible to do so. If a Fund does not qualify for or does not make such election, shareholders will not be entitled separately to claim a credit or deduction with respect to foreign taxes paid by a Fund; in that case the foreign tax will nonetheless reduce a Fund's taxable income. Even if a Fund elects to pass through to shareholders foreign tax credits or deductions, tax-exempt shareholders and those who invest in a Fund through tax-advantaged accounts such as IRAs will not benefit from any such tax credit or deduction. Under certain circumstances, if a Fund receives a refund of foreign taxes paid in respect of a prior year, the value of Fund Shares could be affected or any foreign tax credits or deductions passed through to shareholders in respect of a Fund's foreign taxes for the current year could be reduced.

Certain of a Fund's investment practices, including derivative transactions and investments in debt obligations issued or purchased at a discount, will be subject to special and complex U.S. federal income tax provisions. These special rules may affect the timing, character, and/or amount of a Fund's distributions to shareholders and may require a Fund to sell its investments at a time when it is not advantageous to do so.

The U.S. Treasury and Internal Revenue Service (the “IRS”) generally require a Fund to obtain information sufficient to identify the status of each shareholder under sections 1471-1474 of the Code, and the U.S. Treasury and IRS guidance issued thereunder (collectively, “FATCA”) or under an applicable intergovernmental agreement between the United States and a foreign government. Please see the SAI for more information on FATCA reporting requirements.

Financial Intermediary Arrangements

Payments to Financial Intermediaries

In addition to payments under the Plan described above, a Fund may reimburse SSGA FD or its affiliates for payments made to Financial Intermediaries that provide certain administrative, recordkeeping, and account maintenance services. The amount of the reimbursement and the manner in which it is calculated are reviewed by the Trustees periodically.

If you invest through a Financial Intermediary and meet the eligibility criteria for more than one share class, you should discuss with your Financial Intermediary which share class is appropriate for you. Your financial adviser and the Financial Intermediary employing him or her may have an incentive to recommend one share class over another, when you are eligible to invest in more than one share class. Please speak with your financial adviser to learn more about the total amounts paid to your financial adviser and his or her firm by a Fund or its affiliates with respect to the different share classes offered by a Fund.

Financial Highlights

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET EMERGING MARKETS EQUITY INDEX FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class K
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20 (a)
Net asset value, beginning of period	$61.80	$58.32	$75.97	$79.69	$68.70
Income (loss) from investment operations:
Net investment income (loss) (b)	1.73	1.81	1.97	1.65	1.28
Net realized and unrealized gain (loss)	2.60	3.68	(17.35 )	(3.89 )	11.18
Total from investment operations	4.33	5.49	(15.38 )	(2.24 )	12.46
Distributions to shareholders from:
Net investment income	(1.86 )	(2.01 )	(2.27 )	(1.48 )	(1.47 )
Net asset value, end of period	$64.27	$61.80	$58.32	$75.97	$79.69
Total return (c)	7.01 %	9.47 %	(20.25 )%	(2.80 )%	18.18 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$612,860	$590,378	$596,513	$918,212	$879,295
Ratios to Average Net Assets:
Total expenses	0.30 %	0.31 %	0.33 %	0.30 %	0.31 %
Net expenses	0.15 %	0.17 %	0.17 %	0.17 %	0.17 %
Net investment income (loss)	2.65 %	2.97 %	3.03 %	2.02 %	1.94 %
Portfolio turnover rate	7 %	6 %	19 %	11 %	13 %

(a)	On April 17, 2020, the State Street Emerging Markets Equity Index Fund underwent a 1-for-5 reverse share split. The historical per share activity presented here has been retroactively adjusted to reflect this split. See Note 11.
(b)	Per share numbers have been calculated using average shares outstanding, which more appropriately presents the per share data for the period.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET BALANCED INDEX FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class K
	Year Ended 12/31/24	For the Period 10/30/23*- 12/31/23
Net asset value, beginning of period	$11.30	$10.00
Income (loss) from investment operations:
Net investment income (loss) (a)	0.36	0.06
Net realized and unrealized gain (loss)	1.23	1.30
Total from investment operations	1.59	1.36
Distributions to shareholders from:
Net investment income	(0.07 )	(0.06 )
Net realized gains	(0.01 )	—
Total distributions	(0.08 )	(0.06 )
Net asset value, end of period	$12.81	$11.30
Total return (b)	13.99 %	13.59 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$559,877	$22,606
Ratios to Average Net Assets:
Total expenses	0.29 %	1.12 %(c)
Net expenses	0.04 %	0.04 %(c)
Net investment income (loss)	2.83 %	3.22 %(c)
Portfolio turnover rate	14 %	2 %(d)

*	Commencement of operations.
(a)	Net investment income per share is calculated using the average shares method.
(b)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(c)	Annualized.
(d)	Not annualized.

Contacting the State Street Funds

Online:	www.ssga.com	24 hours a day, 7 days a week
Phone:	(800) 647-7327	Monday – Friday 8:00 am – 6:00 pm EST

Written requests should be sent to:

Regular mail	Overnight/Registered, Express, Certified Mail
State Street Funds P.O. Box 219737 Kansas City, MO 64121-9737	State Street Funds 801 Pennsylvania Avenue, Suite 219737 Kansas City, MO 64105-1307

The Funds do not consider the U.S. Postal Service or other independent delivery services to be its agents. Therefore, deposits in the mail or with such services, or receipt at the Funds' post office box, of purchase orders or redemption requests, do not constitute receipt by the Funds or Transfer Agent.

For more information about the Funds:

SSGA Funds Management, Inc

ONE IRON STREET

BOSTON, MASSACHUSETTS 02210

SSITEMCGSTATPROThe State Street Institutional Investment Trust's Investment Company Act File Number is 811-09819.

Prospectus

April 30, 2025

State Street Institutional
Investment Trust

State Street Equity 500 Index Fund: Administrative Shares (STFAX)

The U.S. Securities and Exchange Commission has not approved or disapproved these securities or passed upon the adequacy of this Prospectus. Any representation to the contrary is a criminal offense.

An investment in the State Street Equity 500 Index Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

The Fund may offer multiple classes of shares. This Prospectus covers only the Administrative Shares.

TABLE OF CONTENTS

Fund Summary	1
State Street Equity 500 Index Fund	1
Additional Information About Investment Objective, Principal Strategies and Risks	8
Additional Information About Non-Principal Investment Strategies and Risks	14
Portfolio Holdings Disclosure	16
Management and Organization	17
Shareholder Information	19
Dividends, Distributions and Tax Considerations	22
Financial Intermediary Arrangements	24
Financial Highlights	26
Index/Trademark Licenses/Disclaimers	28

State Street Equity 500 Index Fund

Investment Objective

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Management Fee	0.02%
Distribution and/or Shareholder Service (12b-1) Fees	0.15%
Other Expenses1	0.08%
Total Annual Fund Operating Expenses	0.25%
Less Fee Waivers and/or Expense Reimbursements2	(0.08%)
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	0.17%

Other Expenses have been restated to reflect current fees.

The Fund's investment adviser, SSGA Funds Management, Inc. (the “Adviser” or “SSGA FM”), is contractually obligated until April 30, 2026, separately with respect to each of the Fund and the Portfolio, (i) to waive up to the full amount of the advisory fee payable by the Fund or the Portfolio, and/or (ii) to reimburse the Fund or the Portfolio to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, extraordinary expenses, and distribution, shareholder servicing, and sub-transfer agency fees) exceed 0.02% of the Fund's or the Portfolio's average daily net assets on an annual basis (for avoidance of doubt, the waiver and/or reimbursement is inclusive of all the allocation of expenses from the Portfolio). This waiver and/or reimbursement may not be terminated prior to April 30, 2026 except with approval of the Fund's/Portfolio's Board of Trustees.

Example:

1 year	3 years	5 years	10 years
$17	$72	$133	$310

Portfolio Turnover:

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). As a shareholder of the Portfolio, the Fund bears its ratable share of the transaction costs associated with the portfolio turnover of the Portfolio. A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund Shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 4% of the average value of its portfolio.

Principal Investment Strategies

Principal Risks

these risks may result in losses to the Fund. An investment in the Fund is subject to investment risks, including possible loss of principal, is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation (“FDIC”) or any other government agency. The Fund may not achieve its investment objective. The Fund is not intended to be a complete investment program, but rather is intended for investment as part of a diversified investment portfolio. Investors should consult their own advisers as to the role of the Fund in their overall investment programs.

Large Transactions Risk: To the extent a large proportion of the shares of the Portfolio or Fund are held by a small number of shareholders (or a single shareholder), including funds or accounts over which the Adviser has investment discretion, the Fund is subject to the risk that these shareholders will purchase or redeem Portfolio or Fund shares in large amounts rapidly or unexpectedly, including as a result of an asset allocation decision made by the Adviser. In addition, a large number of shareholders collectively may purchase or redeem Fund shares in large amounts rapidly or unexpectedly (collectively, such transactions are referred to as “large shareholder transactions”). Large shareholder transactions could adversely affect the ability of the Portfolio or Fund to conduct its investment program.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund's' returns from year-to-year and by showing how the Fund's average annual returns for the periods indicated compared with those of the Index. The bar chart shows how the Administrative Shares' returns have varied for each full calendar year shown. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (800) 997-7327 or by visiting our website at www.ssga.com.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	20.45%	Q2 2020
Lowest Quarterly Return	-19.60%	Q1 2020

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Ten Years
Administrative Shares
Return Before Taxes	24.80 %	14.28 %	12.84 %
Return After Taxes on Distributions	24.34 %	13.76 %	12.05 %
Return After Taxes on Distributions and Sale of Fund Shares	14.96 %	11.37 %	10.43 %
S&P 500 Index (reflects no deduction for fees, expenses or taxes)	25.02 %	14.53 %	13.10 %

The Fund will make updated performance information, including its current net asset value, available at the Fund's website: www.ssga.com.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund and the Portfolio.

Karl Schneider, CAIA, is a Managing Director of the Adviser and Co-Head of the Systematic Equity Group in the Americas. He joined the Adviser in 1997.

Amy Scofield is a Vice President of the Adviser and a Portfolio Manager in the Systematic Equity Group. She joined the Adviser in 2010.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

To establish an account	$25,000,000
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

Written Requests and Wire Transfers. You may purchase or redeem Fund Shares by written request or wire transfer.

Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Intermediary:

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

Additional Information About Investment Objective, Principal Strategies and Risks

State Street Equity 500 Index Fund Administrative Shares

Investment Objective

The Trust's Board of Trustees may change the Fund's investment strategies and other policies without shareholder approval, except as otherwise indicated. The Board of Trustees may change the Fund's investment objective without shareholder approval. If the Trustees were to approve a change to the Equity 500 Index Fund's investment objective, shareholders would receive advance notice.

Principal Investment Strategies

The Fund generally intends to invest in all stocks comprising the S&P 500 in approximate proportion to their weightings in the Index. However, under various circumstances, it may not be possible or practicable to purchase all stocks in those weightings. In those circumstances, the Fund may purchase a sample of the stocks in the Index in proportions expected by SSGA FM to match generally the performance of the Index as a whole. In addition, from time to time, stocks are added to or removed from the Index. The Fund may sell securities that are represented in the Index, or purchase securities that are not yet represented in the Index, in anticipation of their removal from or addition to the Index. Under normal market conditions, the Fund will not invest less than 80% of its total assets in stocks in the Index. Shareholders will receive sixty (60) days' notice prior to a change in the 80% investment policy. For this purpose, “total assets” means net assets plus borrowings, if any. The notional value of the Fund's investments in derivatives or other synthetic instruments that provide exposures comparable, in the judgment of the Adviser, to investments in the Index may be counted toward satisfaction of this 80% policy. In addition, the Fund may invest in equity securities that are not included in the Index, cash and cash equivalents or money market instruments, such as repurchase agreements and money market funds (including money market funds advised by the Adviser).

Additional Information About Risks

The Fund is subject to the following principal risks. The risks are described in alphabetical order and not in the order of importance or potential exposure.

Counterparty Risk. The Fund will be subject to credit risk with respect to the counterparties with which the Fund enters into derivatives contracts and other transactions such as repurchase agreements or reverse repurchase agreements. The Fund's ability to profit from these types of investments and transactions will depend on the willingness and ability of its counterparty to perform its obligations. If a counterparty fails to meet its contractual obligations, the Fund may be unable to terminate or realize any gain on the investment or transaction, resulting in a loss to the Fund. The Fund may experience significant delays in obtaining any recovery in an insolvency, bankruptcy, or other reorganization proceeding involving its counterparty (including recovery of any collateral posted by it) and may obtain only a limited recovery or may obtain no recovery in such circumstances. If the Fund holds collateral posted by its counterparty, it may be delayed or prevented from realizing on the collateral in the event of a bankruptcy or insolvency proceeding relating to the counterparty. Under applicable law or contractual provisions, including if the Fund enters into an investment or transaction with a financial institution and such financial institution (or an affiliate of the financial institution) experiences financial difficulties, then the Fund may in certain situations be prevented or delayed from exercising its rights to terminate the investment or transaction, or to realize on any collateral and may result in the suspension of payment and delivery obligations of the parties under such investment or transactions or in another institution being substituted for that financial institution without the consent of the Fund. Further, the Fund may be subject to “bail-in” risk under applicable law whereby, if required by the financial institution's authority, the financial institution's liabilities could be written down, eliminated or converted

into equity or an alternative instrument of ownership. A bail-in of a financial institution may result in a reduction in value of some or all of its securities and, if the Fund holds such securities or has entered into a transaction with such a financial security when a bail-in occurs, the Fund may also be similarly impacted.

Derivatives Risk. A derivative is a financial contract the value of which depends on, or is derived from, the value of an underlying asset, interest rate, or index. Derivative transactions typically involve leverage and may have significant volatility. It is possible that a derivative transaction will result in a loss greater than the principal amount invested, that changes in the value of a derivative transaction may not correlate perfectly with the underlying asset, and that the Fund may not be able to close out a derivative transaction at a favorable time or price. Risks associated with derivative instruments include potential changes in value in response to interest rate changes or other market developments or as a result of the counterparty's credit quality; the potential for the derivative transaction not to have the effect the Adviser anticipated or a different or less favorable effect than the Adviser anticipated; the failure of the counterparty to the derivative transaction to perform its obligations under the transaction or to settle a trade; possible mispricing or improper valuation of the derivative instrument; imperfect correlation in the value of a derivative with the asset, rate, or index underlying the derivative; the risk that the Fund may be required to post collateral or margin with its counterparty, and will not be able to recover the collateral or margin in the event of the counterparty's insolvency or bankruptcy; the risk that the Fund will experience losses on its derivatives investments and on its other portfolio investments, even when the derivatives investments may be intended in part or entirely to hedge those portfolio investments; the risks specific to the asset underlying the derivative instrument; lack of liquidity for the derivative instrument, including, without limitation, absence of a secondary trading market; the potential for reduced returns to the Fund due to losses on the transaction and an increase in volatility; the potential for the derivative transaction to have the effect of accelerating the recognition of gain; and legal risks arising from the documentation relating to the derivative transaction.

Equity Investing Risk. The market prices of equity securities owned by the Fund may go up or down, sometimes rapidly or unpredictably. The value of a security may decline for a number of reasons that may directly relate to the issuer, such as management performance, financial leverage, non-compliance with regulatory requirements, and reduced demand for the issuer's goods or services. The values of equity securities also may decline due to general industry or market conditions that are not specifically related to a particular company, such as real or perceived adverse economic conditions, changes in the general outlook for corporate earnings, changes in interest or currency rates, or adverse investor sentiment generally. In addition, equity markets tend to move in cycles, which may cause stock prices to fall over short or extended periods of time.

Healthcare Sector Risk. Companies in the healthcare sector are subject to extensive government regulation and their profitability can be significantly affected by restrictions on government reimbursement for medical expenses, rising costs of medical products and services, pricing pressure (including price discounting), limited product lines and an increased emphasis on the delivery of healthcare through outpatient services. Companies in the healthcare sector are heavily dependent on obtaining and defending patents, which may be time consuming and costly, and the expiration of patents may also adversely affect the profitability of these companies. Healthcare companies are also subject to extensive litigation based on product liability and similar claims. In addition, their products can become obsolete due to industry inno

vation, changes in technologies or other market developments. Many new products in the healthcare sector require significant research and development and may be subject to regulatory approvals, all of which may be time consuming and costly with no guarantee that any product will come to market.

Indexing Strategy/Index Tracking Risk. The Fund is managed with an indexing investment strategy, attempting to track the performance of an unmanaged index of securities. The Fund will seek to replicate Index returns, regardless of the current or projected performance of the Index or of the actual securities comprising the Index. This differs from an actively-managed fund, which typically seeks to outperform a benchmark index. The Fund generally will buy and will not sell a security included in the Index as long as the security is part of the Index regardless of any sudden or material decline in value or foreseeable material decline in value of the security, even though the Adviser may make a different investment decision for other actively managed accounts or portfolios that hold the security. As a result, the Fund's performance may be less favorable than that of a portfolio managed using an active investment strategy. The structure and composition of the Index will affect the performance, volatility, and risk of the Index (in absolute terms and by comparison with other indices) and, consequently, the performance, volatility, and risk of the Fund. Errors in index data, index computations or the construction of the Index in accordance with its methodology may occur from time to time and may not be identified and corrected by the Index Provider for a period of time or at all, which may have an adverse impact on the Fund and its shareholders. While the Adviser seeks to track the performance of the Index (i.e., achieve a high degree of correlation with the Index), the Fund's return may not match the return of the Index for a number of reasons. For example, the return on the sample of securities purchased by the Fund (or the return on securities not included in the Index) to replicate the performance of the Index may not correlate precisely with the return of the Index. The Fund incurs a number of operating expenses not applicable to the Index, and incurs costs in buying and selling securities. In addition, the Fund may not be fully invested at times, either as a result of cash flows into or out of the Fund or reserves of cash held by the Fund to meet redemptions. The Adviser may attempt to track the Index return by investing in fewer than all of the securities in the Index, or in some securities not included in the Index, potentially increasing the risk of divergence between the Fund's return and that of the Index. Changes in the composition of the Index and regulatory requirements also may impact the Fund's ability to match the return of the Index. The Adviser may apply one or more “screens” or investment techniques to refine or limit the number or types of issuers included in the Index in which the Fund may invest. Application of such screens or techniques may result in investment performance below that of the Index and may not produce results expected by the Adviser. Index tracking risk may be heightened during times of increased market volatility or other unusual market conditions.

Information Technology Sector Risk. Market or economic factors impacting information technology companies could have a major effect on the value of the Fund's investments. The value of stocks of information technology companies is particularly vulnerable to rapid changes in technology product cycles, rapid product obsolescence, government regulation and competition, both domestically and internationally, including competition from foreign competitors with lower production costs. Like other technology companies, information technology companies may have limited product lines, markets, financial resources or personnel. Stocks of technology companies and companies that rely heavily on technology, especially those of smaller, less-seasoned companies, tend to be more volatile than the overall market. Information technology companies are heavily dependent on patent and intellectual property rights, the loss or impairment of which may adversely affect profitability. Additionally, companies in the information technology sector may face dramatic and often unpredictable changes in growth rates and competition for the services of qualified personnel.

Large Transactions Risk. To the extent a large proportion of the shares of the Portfolio or Fund are highly concentrated or held by a small number of shareholders (or a single shareholder), including funds or accounts over which the Adviser has investment discretion, the Fund is subject to the risk that these shareholders will purchase or redeem Portfolio or Fund shares in large amounts rapidly or unexpectedly, including as a result of an asset allocation decision made by the Adviser. In addition, a large number of shareholders collectively may purchase or redeem Portfolio or Fund shares in large amounts rapidly or unexpectedly (collectively, such transactions are referred to as “large shareholder transactions”). Large shareholder transactions could adversely affect the ability of the Fund to conduct its investment program. For example, they could require the Portfolio or Fund to sell portfolio securities or purchase portfolio securities unexpect

edly and incur substantial transaction costs and/or accelerate the realization of taxable income and/or gains to shareholders. The effects of taxable income and/or gains resulting from large shareholder transactions would particularly impact non-redeeming shareholders who do not hold their Fund shares in an IRA, 401(k) plan or other tax-advantaged plan. To the extent that such transactions result in short-term capital gains, such gains will generally be taxed at the ordinary income tax rate for shareholders who hold Fund shares in a taxable account. In addition, the Portfolio or Fund may be required to sell its more liquid portfolio investments to meet a large redemption, in which case the Fund's remaining assets may be less liquid, more volatile, and more difficult to price. The Portfolio or Fund may hold a relatively large proportion of its assets in cash in anticipation of large redemptions, diluting its investment returns. A number of circumstances may cause the Portfolio or Fund to experience large redemptions, such as changes in investors' circumstances; changes in the eligibility criteria for the Portfolio or Fund or share class of the Fund; liquidations, reorganizations, repositionings, or other announced Portfolio or Fund events; or changes in investment objectives, strategies, policies, risks, or investment personnel.

Leveraging Risk. Borrowing transactions, reverse repurchase agreements, certain derivatives transactions, securities lending transactions and other investment transactions such as when-issued, delayed-delivery, or forward commitment transactions may create investment leverage. If the Fund engages in transactions that have a leveraging effect on the Fund's investment portfolio, the value of the Fund will be potentially more volatile and all other risks will tend to be compounded. This is because leverage generally creates investment risk with respect to a larger base of assets than the Fund would otherwise have and so magnifies the effect of any increase or decrease in the value of the Fund's underlying assets. The use of leverage is considered to be a speculative investment practice and may result in losses to the Fund. Certain derivatives have the potential for unlimited loss, regardless of the size of the initial investment. The use of leverage may cause the Fund to liquidate positions when it may not be advantageous to do so to satisfy repayment, interest payment, or margin obligations.

Liquidity Risk. Liquidity risk is the risk that the Fund may not be able to dispose of investments readily at a favorable time or prices (or at all) or at prices approximating those at which the Fund currently values them. For example, certain investments may be subject to restrictions on resale, may trade in the over-the-counter market or in limited volume, or may not have an active trading market. Illiquid investments may trade at a discount from comparable, more liquid investments and may be subject to wide fluctuations in market value. It may be difficult for the Fund to value illiquid investments accurately. The market for certain investments may become illiquid under adverse market or economic conditions independent of any specific adverse changes in the conditions of a particular issuer. Disposal of illiquid investments may entail registration expenses and other transaction costs that are higher than those for liquid investments. The Fund may seek to borrow money to meet its obligations (including among other things redemption obligations) if it is unable to dispose of illiquid investments, resulting in borrowing expenses and possible leveraging of the Fund. In some cases, due to unanticipated levels of illiquidity the Fund may choose to meet its redemption obligations wholly or in part by distributions of assets in-kind.

on the values of the Fund's investments. On January 31, 2020, the United Kingdom (“UK”) formally withdrew from the European Union (“EU”) (commonly known as “Brexit”). An agreement between the UK and the EU governing their future trade relationship became effective January 1, 2021, but that agreement does not include an agreement on financial services, and it is unlikely that such agreement will be concluded. Moreover, the UK government has started a program of financial services law reform with the ultimate aim of repealing many EU financial services laws that were assimilated into UK law from January 1, 2021, and replacing them with legislation or rules made by the UK government or financial services regulators. Accordingly, uncertainty remains in certain areas as to the future relationship between the UK and the EU. Brexit has already had a significant impact on the UK, Europe, and global economies, and could continue to result in volatility and illiquidity, legal, political, economic and regulatory uncertainties and lower economic growth for these economies that could in turn have an adverse effect on the value of the Fund's investments. Any further exits from the EU, or the possibility of such exits, or the abandonment of the euro, may cause additional market disruption globally and introduce new legal and regulatory uncertainties.

Securities and financial markets may be susceptible to market manipulation or other fraudulent trade practices, which could disrupt the orderly functioning of these markets or adversely affect the values of investments traded in these markets, including investments held by the Fund. To the extent the Fund has focused its investments in the market or index of a particular region, adverse geopolitical and other events could have a disproportionate impact on the Fund.

Market Risk. Market prices of investments held by the Fund will go up or down, sometimes rapidly or unpredictably. The Fund's investments are subject to changes in general economic conditions, general market fluctuations and the risks inherent in investment in securities markets. Investment markets can be volatile, and prices of investments can change substantially due to various factors, including, but not limited to, economic growth or recession, changes in interest rates, inflation, changes in actual or perceived creditworthiness of issuers and general market liquidity. Even if general economic conditions do not change, the value of an investment in the Fund could decline if the particular industries, sectors or companies in which the Fund invests do not perform well or are adversely affected by events. Further, legal, political, regulatory and tax changes also may cause fluctuations in markets and securities prices. Local, regional or global events such as war, military conflicts, acts of terrorism, trade policy changes or disputes, the threat of or actual imposition of tariffs, natural disasters, public health issues, or other events could have a significant impact on the Fund and its investments. Due to the interconnectedness of economies and financial markets throughout the world, if the Fund invests in securities of issuers located in or with significant exposure to countries experiencing economic and financial difficulties, the value and liquidity of the Fund's investments may be negatively affected. A widespread outbreak of an infectious illness and efforts to contain its spread, may result in market volatility, inflation, reduced liquidity of certain instruments, disruption in the trading of certain instruments, and systemic economic weakness. The foregoing could impact the Fund and its investments and result in disruptions to the services provided to the Fund by its service providers.

Market Volatility; Government Intervention Risk. Market dislocations and other external events, such as the failures or near failures of significant financial institutions, dislocations in investment or currency markets, corporate or governmental defaults or credit downgrades, or poor collateral performance, may subject the Fund to significant risk of substantial volatility and loss. Governmental and regulatory authorities have taken, and may in the future take, actions to provide or arrange credit supports to financial institutions whose operations have been compromised by credit market dislocations and to restore liquidity and stability to financial systems in their jurisdictions; the implementation of such governmental interventions and their impact on both the markets generally and the Fund's investment program in particular can be uncertain. Governmental and non-governmental issuers may default on, or be forced to restructure, their debts, and other issuers may face difficulties obtaining credit. Defaults or restructurings by governments or others of their debts could have substantial adverse effects on economies, financial markets, and asset valuations around the world. Federal Reserve or other U.S. or non-U.S. governmental or central bank actions, including interest rate increases or contrary actions by different governments, or investor perception that these efforts are not succeeding, could negatively affect financial markets generally as well as the values and liquidity of certain securities.

cash flows. Due to this and other factors, the Adviser may have an incentive to invest the Fund's assets in a master fund sponsored or managed by the Adviser or its affiliates in lieu of investments by the Fund directly in portfolio securities, or may have an incentive to invest in such master fund over a master fund sponsored or managed by others. Similarly, the Adviser may have an incentive to delay or decide against the sale of interests held by the Fund in a master fund sponsored or managed by the Adviser or its affiliates. It is possible that other clients of the Adviser or its affiliates will purchase or sell interests in a master fund sponsored or managed by the Adviser or its affiliates at prices and at times more favorable than those at which the Fund does so. The Fund will bear its pro rata portion of the expenses incurred by the master fund.

Risk of Investment in Other Pools. If the Fund invests in another pooled investment vehicle, it is exposed to the risk that the other pool will not perform as expected. The Fund is exposed indirectly to all of the risks applicable to an investment in such other pool. In addition, lack of liquidity in the underlying pool could result in its value being more volatile than the underlying portfolio of securities, and may limit the ability of the Fund to sell or redeem its interest in the pool at a time or at a price it might consider desirable. The investment policies and limitations of the other pool may not be the same as those of the Fund; as a result, the Fund may be subject to additional or different risks, or may achieve a reduced investment return, as a result of its investment in another pool. If a pool is an exchange-traded fund or other product traded on a securities exchange or otherwise actively traded, its shares may trade at a premium or discount to their NAV, an effect that might be more pronounced in less liquid markets. The Fund bears its proportionate share of the fees and expenses of any pool in which it invests. The Adviser or an affiliate may serve as investment adviser to a pool in which the Fund may invest, leading to potential conflicts of interest. For example, the Adviser or its affiliates may receive fees based on the amount of assets invested in the pool. Investment by the Fund in the pool may be beneficial to the Adviser or an affiliate in the management of the pool, by helping to achieve economies of scale or enhancing cash flows. Due to this and other factors, the Adviser may have an incentive to invest the Fund's assets in a pool sponsored or managed by the Adviser or its affiliates in lieu of investments by the Fund directly in portfolio securities, or may have an incentive to invest in the pool over a pool sponsored or managed by others. Similarly, the Adviser may have an incentive to delay or decide against the sale of interests held by the Fund in a pool sponsored or managed by the Adviser or its affiliates. It is possible that other clients of the Adviser or its affiliates will purchase or sell interests in a pool sponsored or managed by the Adviser or its affiliates at prices and at times more favorable than those at which the Fund does so.

Unconstrained Sector Risk. The Fund may invest a substantial portion of its assets within one or more economic sectors or industries, which may change from time to time. When the Fund focuses its investments in a particular industry or sector, financial, economic, business, and other developments affecting issuers in that industry, market, or economic sector will have a greater effect on the Fund than if it had not focused its assets in that industry, market, or economic sector, which may increase the volatility of the Fund. Any such investment focus may also limit the liquidity of the Fund. In addition, investors may buy or sell substantial amounts of the Fund's shares in response to factors affecting or expected to affect an industry, market, or economic sector in which the Fund focuses its investments, resulting in extreme inflows or outflows of cash into and out of the Fund. Such extreme cash inflows or outflows might affect management of the Fund adversely.

Additional Information About Non-Principal Investment Strategies and Risks

Conflicts of Interest Risk. An investment in the Fund will be subject to a number of actual or potential conflicts of interest. For example, the Adviser or its affiliates may provide services to the Fund, such as securities lending agency services, custodial, administrative, bookkeeping, and accounting services, transfer agency and shareholder servicing, securities brokerage services, and other services for which the Fund would compensate the Adviser and/or such affiliates. The Fund may invest in other pooled investment vehicles sponsored, managed, or otherwise affiliated with the Adviser. There is no assurance that the rates at which the Fund pays fees or expenses to the Adviser or its affiliates, or the terms on which it enters into transactions with the Adviser or its affiliates will be the most favorable available in the market generally or as favorable as the rates the Adviser or its affiliates make available to other clients. Because of its financial interest, the Adviser will have an incentive to enter into transactions or arrangements on behalf of the Fund with itself or its affiliates in circumstances where it might not have done so in the absence of that interest, provided that the Adviser will comply with applicable regulatory requirements.

(subject to applicable law) be simultaneously seeking to purchase (or sell) investments for the Fund and to sell (or purchase) the same investment for accounts, funds, or structured products for which it serves as asset manager, or for other clients or affiliates. The Adviser and its affiliates may invest for clients in various securities that are senior, pari passu or junior to, or have interests different from or adverse to, the securities that are owned by the Fund. The Adviser or its affiliates, in connection with its other business activities, may acquire material nonpublic confidential information that may restrict the Adviser from purchasing securities or selling securities for itself or its clients (including the Fund) or otherwise using such information for the benefit of its clients or itself.

The foregoing does not purport to be a comprehensive list or complete explanation of all potential conflicts of interests which may affect the Fund. The Fund may encounter circumstances, or enter into transactions, in which conflicts of interest that are not listed or discussed above may arise.

Cybersecurity Risk. With the increased use of technologies such as the Internet and the dependence on computer systems to perform business and operational functions, funds (such as the Fund and the Portfolio) and their service providers (including the Adviser) may be prone to operational and information security risks resulting from cyber-attacks and/or technological malfunctions. Furthermore, geopolitical tensions may have increased the scale and sophistication of deliberate cybersecurity attacks, particularly those from nation-states or from entities with nation-state backing. In general, cyber-attacks are deliberate, but unintentional events may have similar effects. Cyber-attacks include, among others, stealing or corrupting data maintained online or digitally, preventing legitimate users from accessing information or services on a website, releasing confidential information without authorization, and causing operational disruption. Successful cyber-attacks against, or security breakdowns of, the Fund, the Portfolio, the Adviser or a custodian, transfer agent, or other affiliated or third-party service provider may adversely affect the Fund or its shareholders. For instance, cyber-attacks or technical malfunctions may interfere with the processing of shareholder or other transactions, affect the Fund's ability to calculate its NAV, cause the release of private shareholder information or confidential Fund information, impede trading, cause reputational damage, and subject the Fund to regulatory fines, penalties or financial losses, reimbursement or other compensation costs, and additional compliance costs. Cyber-attacks or technical malfunctions may render records of Fund assets and transactions, shareholder ownership of Fund Shares, and other data integral to the functioning of the Fund inaccessible or inaccurate or incomplete. The Fund may also incur substantial costs for cybersecurity risk management in order to prevent cyber incidents in the future. The Fund and its shareholders could be negatively impacted as a result. While the Adviser has established business continuity plans and systems designed to minimize the risk of cyber-attacks through the use of technology, processes and controls, there are inherent limitations in such plans and systems, including the possibility that certain risks have not been identified, given the evolving nature of this threat. The use of artificial intelligence (“AI”) and machine learning could exacerbate these risks or result in cyber security incidents that implicate personal data. The Fund relies on third-party service providers for many of its day-to-day operations, and will be subject to the risk that the protections and protocols implemented by those service providers will be ineffective to protect the Fund from cyber-attack. The Adviser does not control the cybersecurity plans and systems put in place by third-party service providers, and such third-party service providers may have limited indemnification obligations to the Adviser or the Fund. Similar types of cybersecurity risks or technical malfunctions also are present for issuers of securities in which the Fund invests, which could result in material adverse consequences for such issuers, and may cause the Fund's investment in such securities to lose value.

Index Construction Risk. A security included in the Index may not exhibit the characteristic or provide the specific exposure for which it was selected and consequently the Fund's holdings may not exhibit returns consistent with that characteristic or exposure.

Index Licensing Risk. It is possible that the license under which the Adviser or the Fund is permitted to replicate or otherwise use the Index will be terminated or may be disputed, impaired or cease to remain in effect. In such a case, the Adviser may be required to replace the Index with another index which it considers to be appropriate in light of the investment strategy of the Fund. The use of any such substitute index may have an adverse impact on the Fund's performance. In the event that the Adviser is unable to identify a suitable replacement for the Index, it may determine to terminate the Fund.

adverse market, economic, industry, political, regulatory, geopolitical, and other conditions could cause the share price of such a money market fund to fall below $1.00. It is possible that such a money market fund will issue and redeem shares at $1.00 per share at times when the fair value of the money market fund's portfolio per share is more or less than $1.00. The SEC has adopted amendments to money market fund regulation that, among other things, increase the daily and weekly liquid asset requirements. Such amendments may limit the Funds' investment flexibility and reduce its ability to generate returns. A money market fund may be permitted to impose redemption fees during periods of high illiquidity in the markets for the investments held by it. None of State Street Corporation, State Street Bank and Trust Company (“State Street”), State Street Global Advisors, Inc. (“SSGA”), SSGA FM or their affiliates (collectively, the “State Street Entities”) guarantee the value of an investment in a money market fund at $1.00 per share. Investors should have no expectation of capital support to a money market fund from the State Street Entities. Other money market funds price and transact at a “floating” NAV that will fluctuate along with changes in the market-based value of fund assets. Shares sold utilizing a floating NAV may be worth more or less than their original purchase price. Recent changes in the regulation of money market funds may affect the operations and structures of money market funds. A money market fund may be permitted or required to impose redemption fees during times of market stress.

Securities Lending Risk. The Fund may lend portfolio securities in an amount not to exceed 40% of the value of its net assets. For these purposes, net assets shall exclude the value of all assets received as collateral for the loan. Such loans may be terminated at any time. Any such loans must be continuously secured by collateral (either cash or other obligations as may be permitted under the Fund's securities lending program) maintained on a current basis in an amount at least equal to the market value of the securities loaned by the Fund, marked to market each trading day. The Fund will receive the amount of all dividends, interest and other distributions on the loaned securities; however, the borrower has the right to vote the loaned securities. The Fund will call loans to vote proxies if a material issue affecting the investment is to be voted upon. Efforts to recall such securities promptly may be unsuccessful, especially for foreign securities or thinly traded securities. Securities lending involves the risk that the Fund may lose money because the borrower of the loaned securities fails to return the securities in a timely manner or at all. Should the borrower of the securities fail financially, the Fund may experience delays in recovering the securities or exercising its rights in the collateral. Loans are made only to borrowers that are deemed by the securities lending agent to be of good financial standing. In a loan transaction, the Fund will also bear the risk of any decline in value of securities acquired with cash collateral. The Fund expects to invest cash collateral in a pooled investment vehicle advised by the Adviser (e.g., a mutual fund or exchange-traded fund). With respect to index funds, to the extent the collateral provided or investments made with cash collateral differ from securities included in the relevant Index, such collateral or investments may have a greater risk of loss than the securities included in the Index. In addition, the Fund will be subject to the risk that any income generated by reinvesting cash collateral is lower than any fees the Fund has agreed to pay a borrower.

Portfolio Holdings Disclosure

The Fund's portfolio holdings disclosure policy is described in the Statement of Additional Information (“SAI”).

Management and Organization

The Fund is a separate, diversified series of the State Street Institutional Investment Trust (the “Trust”), which is an open-end management investment company organized as a business trust under the laws of the Commonwealth of Massachusetts.

The Fund invests as part of a “master/feeder” structure. The Fund currently seeks to achieve its investment objective by investing substantially all of its investable assets in the Portfolio, a separate mutual fund, that has substantially identical investment objective, investment policies, and risks as the Fund. All discussions about the Fund's investment objective, policies and risks should be understood to refer also to the investment objectives, policies and risks of the Portfolio.

The Portfolio's shares are offered exclusively to investors (including without limitation, registered investment companies, private investment pools, bank collective funds, and investment separate accounts) that, like the Fund, pay fees to SSGA FM or its affiliates. The fees paid by those investment vehicles to SSGA FM (or its affiliates) vary depending on a number of factors, including by way of example, the services provided, the risks borne by SSGA FM (or its affiliates), fee rates paid by competitive investment vehicles, and in some cases direct negotiation with investors in the Portfolio.

The Fund can withdraw its investment in the Portfolio if, at any time, the Fund's Board of Trustees determines that it would be in the best interests of the Fund's shareholders, or if the investment objectives of the Portfolio changed so that they were inconsistent with the objectives of the Fund. If the Fund withdraws its investment from the Portfolio, the Fund may invest all of its assets in another mutual fund that has the same investment objective as the Fund, the Adviser may directly manage the Fund's assets, or the Board may take such other action it deems appropriate and in the best interests of shareholders of the Fund, which may include liquidation of the Fund.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund and Portfolio pursuant to an investment advisory agreement (“Investment Advisory Agreement”) between the Trust and the Adviser, and, subject to the oversight of the Board, is responsible for the investment management of the Fund. The Adviser provides an investment management program for the Fund and manages the investment of the Fund's assets. In addition, the Adviser provides administrative, compliance and general management services to the Fund. The Adviser is a wholly-owned subsidiary of State Street Global Advisors, Inc., which itself is a wholly-owned subsidiary of State Street Corporation. The Adviser is registered with the U.S. Securities and Exchange Commission (“SEC”) under the Investment Advisers Act of 1940, as amended. The Adviser and certain other affiliates of State Street Corporation make up SSGA. SSGA is one of the world's largest institutional money managers and the investment management arm of State Street Corporation. As of December 31, 2024, the Adviser managed approximately $1.11 trillion in assets and SSGA managed approximately $4.72 trillion in assets. The Adviser's principal business address is One Iron Street, Boston, Massachusetts 02210.

The Fund has entered into an investment advisory agreement with the Adviser pursuant to which the Adviser will manage the Fund's assets, for compensation paid at an annual rate of 0.02% of the Fund's average daily net assets. For the year ended December 31, 2024, the Fund's effective management fee paid was 0.00% of average daily net assets. The Adviser places all orders for purchases and sales of the Portfolio's investments. The Portfolio pays no investment advisory fees to SSGA FM.

Total Annual Fund Operating Expense Waiver. SSGA FM, as the investment adviser to the Fund and its corresponding Portfolio, is contractually obligated, through April 30, 2026, (i) to waive up to the full amount of the advisory fee payable by the Fund or its Portfolio, and/or (ii) to reimburse the Fund or its Portfolio to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, extraordinary expenses, and distribution, shareholder servicing and sub-transfer agency fees) exceed 0.02% of average daily net assets on an annual basis. The expense limitation for the Fund is inclusive of the allocation of expenses from its Portfolio. The waiver and/or reimbursement for the Fund may not be terminated prior to April 30, 2026 except with approval of the Board of Trustees.

A discussion regarding the Board's consideration of the Fund's Investment Advisory Agreement is provided in the Fund's Form N-CSR filing with the SEC for the period ended June 30, 2024.

The Adviser manages the Fund and the Portfolio using a team of investment professionals. The team approach is used to create an environment that encourages the flow of investment ideas. The portfolio managers within the team work together in a cohesive manner to develop and enhance techniques that drive the investment process for the respective investment strategy. This approach requires portfolio managers to share a variety of responsibilities, including invest

ment strategy and analysis, while retaining responsibility for the implementation of the strategy within any particular portfolio. The approach also enables the team to draw upon the resources of other groups within SSGA. The portfolio management team is overseen by SSGA's internal governance.

The professionals primarily responsible for the day-to-day management of the Equity 500 Index II Portfolio and the Equity 500 Index Fund include the following:

Karl Schneider, CAIA, is a Managing Director of SSGA and the Adviser and Co-Head of the Systematic Equity Group (“SEG”) in the Americas. He also serves as a Senior Portfolio Manager for a number of the group's index equity portfolios. Previously within the SEG, he was the Deputy Head of the Americas, and prior to that served as a portfolio manager and product specialist for U.S. equity strategies and synthetic beta strategies, including commodities, buy/write, and hedge fund replication. He is a member of the S&P Dow Jones U.S. Equities Index Advisory Panel. Prior to joining the SEG, Mr. Schneider worked as a portfolio manager in SSGA's Currency Management Group, managing both active currency selection and traditional passive hedging overlay portfolios. He joined SSGA in 1997. Mr. Schneider holds a Bachelor of Science in Finance and Investments from Babson College and a Master of Science in Finance from the Carroll School of Management at Boston College. He has earned the Chartered Alternative Investment Analyst (CAIA) designation and is a member of the CAIA Association.

Additional information about the portfolio managers' compensation, other accounts managed by the portfolio managers, and the portfolio managers' ownership of the Fund is available in the SAI.

Other Fund Services

The Administrator, Sub-Administrator and Custodian

The Adviser serves as administrator of the Fund. The amount of the fee paid to the Adviser for administrative services may vary by share class. The Fund currently pays the Adviser an administrative fee at the annual rate of 0.05% with respect to each of its share classes. State Street, a subsidiary of State Street Corporation, serves as sub-administrator for the Fund for a fee that is paid by the Adviser. State Street also serves as custodian of the Fund for a separate fee that is paid by the Fund. SSGA FM serves as administrator of the Portfolio and State Street serves as sub-administrator and custodian of the Portfolio.

The Transfer Agent and Dividend Disbursing Agent

SS&C GIDS, Inc. is the Fund's transfer agent and dividend disbursing agent (the “Transfer Agent”).

The Distributor

State Street Global Advisors Funds Distributors, LLC serves as the Fund's distributor (“SSGA FD”) pursuant to the Distribution Agreement between SSGA FD and the Trust.

Additional Information

The Trustees of the Trust oversee generally the operations of the Fund and the Trust. The Trust enters into contractual arrangements with various parties, including, among others, the Fund's investment adviser, custodian, transfer agent, and accountants, who provide services to the Fund. Shareholders are not parties to any such contractual arrangements or intended beneficiaries of those contractual arrangements, and those contractual arrangements are not intended to create in any shareholder any right to enforce them directly against the service providers or to seek any remedy under them directly against the service providers.

This Prospectus provides information concerning the Trust and the Fund that you should consider in determining whether to purchase shares of the Fund. Neither this Prospectus, nor the related SAI, is intended, or should be read, to be or to give rise to an agreement or contract between the Trust or the Fund and any investor, or to give rise to any rights in any shareholder or other person other than any rights under federal or state law that may not be waived.

Shareholder Information

Determination of Net Asset Value

The Fund determines its net asset value (“NAV”) per share once each business day as of the close of regular trading on the New York Stock Exchange (the “NYSE”). Pricing does not occur on NYSE holidays. A business day is one on which the NYSE is open for regular trading. The Federal Reserve is closed on certain holidays on which the NYSE is open. These holidays are Columbus Day and Veterans Day. On these holidays, you will not be able to purchase shares by wiring Federal Funds because Federal Funds wiring does not occur on days when the Federal Reserve is closed. In unusual circumstances, such as an emergency or an unscheduled close or halt of trading on the NYSE, the time at which share prices are determined may be changed. The NAV per share is based on the market value of the investments held in the Fund. The NAV of the Fund's Administrative Shares is calculated by dividing the value of the assets of the Fund attributable to its Administrative Shares less the liabilities of the Fund attributable to its Administrative Shares by the number of Administrative Shares outstanding. As noted in this Prospectus, the Fund may invest in securities listed on foreign exchanges, or otherwise traded in a foreign market, and those securities may trade on weekends or other days when the Fund does not price its shares. Consequently, the NAV of the Fund's shares may change on days when shareholders are not able to purchase or redeem the Fund's shares. Purchase and redemption orders for Fund Shares are processed, respectively, at the NAV next determined after the Fund accepts a purchase order or receives a redemption request in good form. The Fund values each security or other investment pursuant to guidelines adopted by the Fund's Board of Trustees. The Board has appointed the Adviser as the valuation designee to fair value securities or other investments pursuant to procedures approved by the Fund's Board of Trustees, under certain limited circumstances. For example, fair value pricing may be used when market quotations are not readily available or reliable, such as when (i) trading for a security is restricted; or (ii) a significant event, as determined by the Adviser, that may affect the value of one or more securities or other investments held by the Fund occurs after the close of a related exchange but before the determination of the Fund's NAV. Attempts to determine the fair value of securities or other investments introduce an element of subjectivity to the pricing of securities or other investments. As a result, the price of a security or other investment determined through fair valuation techniques may differ from the price quoted or published by other sources and may not accurately reflect the price the Fund would have received had it sold the investment. To the extent that the Fund invests in the shares of other registered open-end investment companies that are not traded on an exchange (mutual funds), such shares are valued at their published net asset values per share as reported by the funds. The prospectuses of these funds explain the circumstances under which the funds will use fair value pricing and the effects of using fair value pricing.

Investing in State Street Institutional Investment Trust Shares

This section of the Prospectus explains the basics of doing business with the State Street Funds. Carefully read each topic. The policies set forth below regarding the purchase, redemption and exchange of State Street Fund shares are in addition to the “Purchase and Sale of Fund Shares” section contained in the “Fund Summary” portion of this Prospectus. The State Street Funds reserve the right to change the following policies, without notice to shareholders; except that any modification or termination of the exchange privileges described in this Prospectus will be preceded by 60 days' advance notice to shareholders. Please call or check online for current information. Requests for transactions in the State Street Funds will be processed when they are received in “good order.” “Good order” means that the request is in an accurate and complete form, and all applicable documents have been received in such accurate and complete form (including, typically, a signed application and medallion-guaranteed documents), and, for a purchase request, the check or wired funds have cleared.

Purchasing Shares

Investors pay no sales load to invest in the Administrative Shares of the Fund. The price for Fund shares is the NAV per share. Orders received in good form (a purchase order is in good form if it meets the requirements implemented from time to time by the Fund or its Transfer Agent, and for new accounts includes submission of a completed and signed application and all documentation necessary to open an account) will be priced at the NAV next calculated after the order is accepted by the Fund.

The minimum initial investment in the Administrative Shares is $25 million, although the Adviser may waive the minimum in its discretion. There is no minimum subsequent investment. The Fund intends to be as fully invested as is practicable; therefore, investments must be made either in Federal Funds (i.e., monies credited to the account of the Fund's custodian bank by a Federal Reserve Bank) or securities (“in-kind”) acceptable to the Adviser. Please consult your tax adviser regarding in-kind transactions. (If you purchase shares by check, your order will not be in good form until the Transfer Agent receives federal funds for the check.) The Fund reserves the right to cease accepting investments at any time or to reject any purchase order.

In accordance with certain federal regulations, the Trust is required to obtain, verify and record information that identifies each entity that applies to open an account. For this reason, when you open (or change ownership of) an account, the Trust will request certain information, including your name, address and taxpayer identification number, which will be used to verify your identity. If you are unable to provide sufficient information to verify your identity, the Trust will not open an account for you. As required by law, the Trust may employ various procedures, such as comparing your information to fraud databases or requesting additional information and documentation from you, to ensure that the information supplied by you is correct. The Trust reserves the right to reject any purchase order for any reason, including failure to provide the Trust with information necessary to confirm your identity as required by law.

If you are purchasing through a Financial Intermediary, please contact your Financial Intermediary as their requirements may differ.

Redeeming Shares

An investor may redeem all or any portion of its investment at the NAV next determined after it submits a redemption request, in proper form, to the Fund. Regardless of the method the Fund uses to make a redemption payment, the Fund typically expects to pay out redemption proceeds on the next business day after a redemption request is received in good order. If you purchased State Street Fund shares by check or an automatic investment program and you elect to redeem shares within 15 days of the purchase, you may experience delays in receiving redemption proceeds. In this case, the State Street Funds generally will postpone sending redemption proceeds until it can verify that the check or automatic investment program investment has been collected, but in no event will this delay exceed 15 days. There will be no such delay for redemptions following purchases paid by federal funds wire or by bank cashier's check, certified check or treasurer's check. The State Street Funds reserve the right to pay for redeemed shares within seven days after receiving a redemption order if, in the judgment of the Adviser, an earlier payment could adversely affect a Fund. The State Street Funds reserve the right to suspend the right of shareholder redemption or postpone the date of payment for more than seven days to the extent permitted by the 1940 Act.

Under normal circumstances, the Fund expects to meet redemption requests by using cash or cash equivalents in its portfolio and/or selling portfolio assets to generate cash. The Fund also may pay redemption proceeds using cash obtained through borrowing arrangements (including under the Fund's line of credit, which is shared across all registered funds advised by SSGA FM (other than money market funds)) that may be available from time to time.

kind. You may pay transaction costs and/or taxes to dispose of the securities, and you may receive less for them than the price at which they were valued for purposes of the redemption. In addition, you will be subject to the market risks associated with such securities until such time as you choose to dispose of the security.

During periods of deteriorating or stressed market conditions, when an increased portion of the Fund's portfolio may be comprised of less liquid investments, or during extraordinary or emergency circumstances, the Fund may be more likely to pay redemption proceeds with cash obtained through short-term borrowing arrangements (if available) or by giving you securities.

If your account is held through an Intermediary, please contact them for additional assistance and advice on how to redeem your shares.

Cost Basis Reporting

Upon the redemption of your shares in the Fund, the Fund or, if you purchase your shares through a Financial Intermediary, your Financial Intermediary, generally will be required to provide you and the Internal Revenue Service (the “IRS”) with cost basis and certain other related tax information about the Fund shares you redeemed. Please contact the Fund or consult your Financial Intermediary, as appropriate, for more information regarding available methods for cost basis reporting and how to select or change a particular method. Please consult your tax advisor to determine which available cost basis method is best for you.

About Mail Transactions

If you choose to purchase or redeem shares by sending instructions by regular mail, they will not be deemed received in good order until they are released by the post office and redelivered to the Transfer Agent's physical location at 801 Pennsylvania Avenue, Suite 219737 in Kansas City, MO 64105-1307. There will be a time lag, which may be one or more days, between regular mail receipt at the post office box and redelivery to such physical location and a Fund's net asset value may change over those days. You might consider using express rather than regular mail if you believe time of receipt of your transaction request to be sensitive.

Frequent-Trading Limits

As a means to protect each State Street Fund and its shareholders from Excessive Trading:

•

The State Street Funds' distributor has detailed procedures that document the transparency oversight and monitoring processes performed by the State Street Funds' transfer agent.

Delivery of Documents to Accounts Sharing an Address

To reduce expenses, we may mail only one copy of the Fund's Prospectus and the annual and semi-annual report to those addresses shared by two or more accounts. If you wish to receive individual copies of these documents, please call us at (800) 647-7327, or contact your financial institution. We will begin sending you individual copies thirty (30) days after receiving your request.

Unclaimed Property

Many states have unclaimed property rules that provide for transfer to the state (also known as “escheatment”) of unclaimed property under various circumstances. These circumstances include inactivity (e.g., no owner-initiated contact for a certain period), returned mail (e.g., when mail sent to a shareholder is returned by the post office as undeliverable), or a combination of both inactivity and returned mail. If a State Street Fund identifies property as unclaimed, it will attempt to contact the shareholder, but if that attempt is unsuccessful, the account may be considered abandoned and escheated to the state after the passage of a certain period of time (as required by applicable state law).

It is your responsibility to ensure that you maintain a correct address for your account, and maintain contact in ways such as by contacting the Fund's transfer agent by mail or telephone or accessing your account through the Fund's website, and promptly cashing all checks for dividends, capital gains and redemptions. State requirements for maintaining contact with an account can vary and are subject to change. If you invest in a Fund through a financial intermediary, we encourage you to contact the financial intermediary regarding applicable state unclaimed property laws. The Fund, the transfer agent and the distributor will not be liable to shareholders or their representatives for good faith compliance with state unclaimed property laws. Please check your state's unclaimed or abandoned property website for specific information.

If you are a resident of the state of Texas, you may designate a representative to receive escheatment notifications by completing and submitting a designation form, which you can find on the website of the Texas Comptroller. Designating such a representative may be beneficial, since Texas law provides that the escheatment period will cease if the representative, after receiving an escheatment notification regarding your account, communicates knowledge of your location and confirms that you have not abandoned your account. You can mail a completed designation form to the Fund (if you hold shares directly with the Fund) or to your financial intermediary (if you do not hold shares directly with the Fund).

Dividends, Distributions and Tax Considerations

Dividends of investment income and capital gain distributions of the Fund will be declared and paid at least annually. Any investment income and capital gains that have not been distributed by December of each calendar year are generally distributed at such time. When the Fund distributes investment income or capital gains, the NAV per share is reduced by the amount of the distribution. Dividends of investment income and capital gain distributions will be paid in additional shares on the record date unless you have elected to receive them in cash.

The following discussion is a summary of some important U.S. federal income tax considerations generally applicable to an investment in the Fund. Your investment in the Fund may have other tax implications. Please consult your tax advisor about federal, state, local, foreign or other tax laws applicable to you. Investors, including non-U.S. investors, may wish to consult the SAI tax section for additional disclosure.

The Fund invests substantially all of its assets in the Portfolio, which is expected to be treated as a regulated investment company for U.S. federal income tax purposes, and so substantially all of the Fund's income will result from distributions or deemed distributions from the Portfolio. Therefore, as applicable, and except as otherwise stated, references in this section to the assets owned or income earned by the Fund will include such assets and income of the Portfolio. The Fund has elected to be treated as a regulated investment company and intends each year to qualify and to be eligible to be treated as such. A regulated investment company generally is not subject to tax at the corporate level on income and gains that are timely distributed to shareholders. In order to qualify and be eligible for treatment as a regulated investment company, the Fund must, among other things, satisfy diversification, 90% gross income and distribution requirements. The Fund's failure to qualify and be eligible for treatment as a regulated investment company would result in corporate level taxation, and consequently, a reduction in income available for distribution to shareholders.

The Fund generally expects to satisfy the requirements to qualify and be eligible to be treated as a regulated investment company, provided that the Portfolio also meets these requirements; the Fund currently expects that the Portfolio will meet these requirements. Because the Fund will invest substantially all its assets in the Portfolio, if the Portfolio were to fail to satisfy the diversification, 90% gross income, or distribution requirement and were not to cure that failure, the Fund itself would be unable to satisfy the diversification requirement. Such a failure to qualify and be eligible for treatment as a regulated investment company could subject the Fund and/or the Portfolio to regular corporate income taxes.

For U.S. federal income tax purposes, distributions of investment income generally are taxable to you as ordinary income. Taxes on distributions of capital gains generally are determined by how long the Fund or the Portfolio owned (or is deemed to have owned) the investments that generated them, rather than how long you have owned your Fund Shares. Distributions of net capital gains (that is, the excess of net long-term capital gains over net short-term capital losses) from the sale of investments that the Fund or the Portfolio owned (or is deemed to have owned) for more than one year that are properly reported by the Fund, or the Portfolio and the Fund, as capital gain dividends generally will be treated as long-term capital gain includible in your net capital gain and taxed to individuals at reduced rates. Distributions of gains from investments that the Fund or the Portfolio owned (or is deemed to have owned) for one year or less generally will be taxable to you as ordinary income when distributed to you by the Fund. Distributions of investment income properly reported by the Fund, or the Portfolio and the Fund, as derived from “qualified dividend income,” which will not include income from the Fund's or the Portfolio's portfolio securities on loan, are taxed to individuals at the rates applicable to net capital gain, provided holding period and other requirements are met by the shareholder, the Fund, and if applicable, the Portfolio. Distributions are taxable to you even if they are paid from income or gains earned by the Fund or the Portfolio before your investment (and thus were included in the price you paid for your shares). Distributions may also be subject to state and local taxes and are taxable whether you receive them in cash or reinvest them in additional shares. Distributions in excess of the Fund's current and accumulated earnings and profits are treated as a return of capital to the extent of your basis in the Fund's shares, and, in general, as capital gain thereafter.

An additional 3.8% Medicare contribution tax is imposed on the “net investment income” of individuals, estates and trusts to the extent their income exceeds certain threshold amounts. Net investment income generally includes for this purpose dividends paid by the Fund, including any capital gain dividends, and net gains recognized on the redemption (or other taxable disposition) of Fund Shares.

Certain of the Fund's or the Portfolio's investment practices, including derivative transactions and investments in debt obligations issued or purchased at a discount, will be subject to special and complex U.S. federal income tax provisions. These special rules may affect the timing, character, and/or amount of the Fund's distributions, or Portfolio's distributions to the Fund, and, in turn, the Fund's distributions to shareholders, and may require the Fund or the Portfolio to sell its investments at a time when it is not advantageous to do so.

The Fund's investments in the Portfolio may cause the tax treatment of the Fund's gains, losses and distributions to differ from the tax treatment that would apply if the Fund invested directly in the types of securities held by the Portfolio. As a result, investors may receive taxable distributions earlier and recognize higher amounts of capital gain or ordinary income than they otherwise would.

If you are not a U.S. person, dividends paid by the Fund that the Fund properly reports as capital gain dividends, short-term capital gain dividends, or interest-related dividends, each as further defined in the SAI, are not subject to withholding of U.S. federal income tax, provided that certain requirements are met. The Fund is permitted, but is not required, to report any part of its dividends as are eligible for such treatment. The Fund's dividends other than those the Fund so reports as capital gain dividends, short-term capital gain dividends, or interest-related dividends generally will be subject to U.S. withholding tax at a 30% rate (or lower applicable treaty rate). See the Fund's SAI for further information.

The U.S. Treasury and IRS generally require the Fund to obtain information sufficient to identify the status of each shareholder under sections 1471-1474 of the Internal Revenue Code of 1986, as amended, and the U.S. Treasury and IRS guidance issued thereunder (collectively, “FATCA”) or under an applicable intergovernmental agreement between the United States and a foreign government. Please see the SAI for more information on FATCA reporting requirements.

Cost Basis Reporting. U.S. Treasury regulations mandate cost basis reporting to shareholders and the IRS for redemptions of Fund Shares acquired on or after January 1, 2012 (“Post Effective Date Shares”). If you acquire and hold shares directly through the Fund and not through a Financial Intermediary, SS&C GIDS, Inc. will use a default average cost basis methodology for tracking and reporting your cost basis on Post Effective Date Shares, unless you request, in writing, another cost basis reporting methodology.

Financial Intermediary Arrangements

Distribution Arrangements and Rule 12b-1 Fees

The Fund has adopted a distribution plan pursuant to Rule 12b-1 under the 1940 Act under which the Fund may compensate SSGA FD (or others) for services in connection with the distribution of the Fund's Administrative Shares and for services provided to Fund shareholders (the “Plan”). The Plan calls for payments at an annual rate (based on average daily net assets) of 0.15% of the Fund's net assets attributable to its Administrative Shares. Because these fees are paid out of the assets of the Fund attributable to its Administrative Shares on an ongoing basis, they will increase the cost of your investment and may cost you more over time than paying other types of sales charges.

The Fund may pay distribution fees and other amounts described in this Prospectus at a time when shares of the Fund are unavailable for purchase.

Other Payments to Financial Intermediaries

In addition to payments under the Plan described above, the Fund may reimburse SSGA FD or its affiliates for payments made to Financial Intermediaries that provide certain administrative, recordkeeping, and account maintenance services. The amount of the reimbursement and the manner in which it is calculated are reviewed by the Trustees periodically.

Financial Intermediaries are firms that sell shares of mutual funds, including the Fund, and/or provide certain administrative and account maintenance services to mutual fund investors. Financial Intermediaries may include, among others, brokers, financial planners or advisers, banks, retirement plan recordkeepers and insurance companies.

The Financial Intermediary is often compensated by SSGA FD or its affiliates for the services it performs and in such cases is typically paid continually over time, during the period when the Financial Intermediary's clients hold investments in the Fund. The amount of continuing compensation paid by SSGA FD or its affiliates to different Financial Intermediaries for distribution and/or shareholder services varies. Any compensation is typically a percentage of the value of the Financial Intermediary's clients' investments in the Fund or a per account fee. The variation in compensation may, but will not necessarily, reflect enhanced or additional services provided by the Financial Intermediary.

If you invest through a Financial Intermediary and meet the eligibility criteria for more than one share class, you should discuss with your Financial Intermediary which share class is appropriate for you. Your financial adviser and the Financial Intermediary employing him or her may have an incentive to recommend one share class over another, when you are eligible to invest in more than one share class. Please speak with your financial adviser to learn more about the total amounts paid to your financial adviser and his or her firm by the Fund or its affiliates with respect to the different share classes offered by the Fund.

SSGA FD and its affiliates (including SSGA FM), at their own expense and out of their own assets, may also provide other compensation to Financial Intermediaries in connection with sales of the Fund's shares or the servicing of shareholders or shareholder accounts. Such compensation may include, but is not limited to, financial assistance to Financial Intermediaries in connection with conferences, sales, or training programs for their employees; seminars for the public; advertising or sales campaigns; or other Financial Intermediary-sponsored special events. In some instances, this compensation may be made available only to certain Financial Intermediaries whose representatives have sold or are expected to sell significant amounts of shares. Dealers may not use sales of the Fund's shares to qualify for this compensation to the extent prohibited by the laws or rules of any state or any self-regulatory agency, such as Financial Industry Regulatory Authority, Inc. (“FINRA”).

Financial Highlights

The financial highlight tables are intended to help you understand the Fund's financial performance for the past five fiscal years. Certain information reflects the performance results for a single Fund Share. The total returns in the table represent the rate that an investor would have earned (or lost) on an investment in the Fund (assuming reinvestment of all dividends and distributions). This information has been audited by Ernst & Young LLP, the Trust's independent registered public accounting firm, whose report, along with the Fund's financial highlights and financial statements, are included in the Fund's Form N-CSR filing, which is available upon request. Any references to Notes in these financial highlight tables refer to the “Notes to Financial Statements” section of the Fund's financial statements, and the financial information included in these tables should be read in conjunction with the financial statements incorporated by reference in the SAI.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET EQUITY 500 INDEX FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Administrative Shares
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20 (a)
Net asset value, beginning of period	$356.58	$287.43	$358.78	$286.86	$247.00
Income (loss) from investment operations:
Net investment income (loss) (b)	6.11	4.53	2.18	3.57	3.58
Net realized and unrealized gain (loss)	82.50	70.44	(67.90 )	77.70	41.19
Total from investment operations	88.61	74.97	(65.72 )	81.27	44.77
Contribution from affiliates	—	—	0.13	—	—
Distributions to shareholders from:
Net investment income	(6.46 )	(4.61 )	(2.69 )	(4.40 )	(4.11 )
Net realized gains	—	(1.21 )	(3.07 )	(4.95 )	(0.80 )
Total distributions	(6.46 )	(5.82 )	(5.76 )	(9.35 )	(4.91 )
Net asset value, end of period	$438.73	$356.58	$287.43	$358.78	$286.86
Total return (c)	24.80 %	26.08 %	(18.28 )%(d)	28.32 %	18.14 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$179,564	$162,604	$140,376	$231,075	$246,181
Ratios to Average Net Assets:
Total expenses (e)	0.23 %	0.24 %	0.23 %	0.25 %	0.26 %
Net expenses (e)	0.15 %	0.15 %	0.15 %	0.17 %	0.17 %
Net investment income (loss)	1.50 %	1.41 %	0.70 %	1.09 %	1.45 %
Portfolio turnover rate (f)	4 %	4 %	2 %	6 %	6 %

(a)	On April 17, 2020, the State Street Equity 500 Index Fund underwent a 1-for-10 reverse share split. The per share data presented here have been retroactively adjusted to reflect this split.
(b)	Net investment income per share is calculated using the average shares method.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(d)	If the affiliates had not made contributions during the year ended December 31, 2022, the total return would have been (18.32)%.
(e)	Ratio does not include the expenses of the State Street Equity 500 Index II Portfolio.
(f)	Portfolio turnover rate is from the State Street Equity 500 Index II Portfolio.

Index/Trademark Licenses/Disclaimers

The Index Provider is not affiliated with the Trust, the Adviser, the Fund's Administrator, Sub-Administrator, Custodian, Transfer Agent, SSGA FD or any of their respective affiliates. The Adviser (“Licensee”) has entered into license agreements with the Index Providers pursuant to which the Adviser pays a fee to use their respective Indices. The Adviser is sub-licensing rights to the Indices to the Fund at no charge.

Contacting the State Street Funds

Online:	www.ssga.com	24 hours a day, 7 days a week
Phone:	(800) 647-7327	Monday – Friday 8:00 am – 6:00 pm EST

Written requests should be sent to:

Regular mail	Overnight/Registered, Express, Certified Mail
State Street Funds P.O. Box 219737 Kansas City, MO 64121-9737	State Street Funds 801 Pennsylvania Avenue, Suite 219737 Kansas City, MO 64105-1307

The Fund does not consider the U.S. Postal Service or other independent delivery services to be its agents. Therefore, deposits in the mail or with such services, or receipt at the Fund's post office box, of purchase orders or redemption requests, do not constitute receipt by the Fund or Transfer Agent.

For more information about the Fund:

The Fund's SAI includes additional information about the Fund and is incorporated by reference into this document. Additional information about the Fund's investments is available in the Fund's most recent annual and semi-annual reports to shareholders and in the Fund's Form N-CSR filing. In the Fund's annual report, you will find a discussion of the market conditions and investment strategies that significantly affected the Fund's performance during its last fiscal year. In the Fund's Form N-CSR, you will find the Fund's annual and semi-annual financial statements. The Fund's SAI is available, without charge, upon request. The Fund's annual and semi-annual reports are available, without charge, upon request. Shareholders in the Fund may make inquiries to the Fund to receive such information by calling (800) 997-7327 or the customer service center at the telephone number shown in the accompanying contract prospectus, if applicable. The Fund's Prospectus, SAI, annual and semi-annual reports to shareholders and other information such as the Fund's financial statements are available, free of charge, on the Fund's website at www.ssga.com.

Reports and other information about the Fund are available free of charge on the EDGAR Database on the SEC's Internet site at http://www.sec.gov. Copies of this information also may be obtained, after paying a duplicating fee, by electronic request at the following E-mail address: publicinfo@sec.gov.

SSGA Funds Management, Inc

ONE IRON STREET

BOSTON, MASSACHUSETTS 02210

SSITEQ5ADSTATPROThe State Street Institutional Investment Trust's Investment Company Act File Number is 811-09819.

Prospectus

April 30, 2025

State Street Institutional
Investment Trust

State Street Equity 500 Index Fund: Class R Shares (SSFRX)

The U.S. Securities and Exchange Commission has not approved or disapproved these securities or passed upon the adequacy of this Prospectus. Any representation to the contrary is a criminal offense.

An investment in the State Street Equity 500 Index Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

The Fund may offer multiple classes of shares. This Prospectus covers only the Class R Shares.

TABLE OF CONTENTS

Fund Summary	1
State Street Equity 500 Index Fund	1
Additional Information About Investment Objective, Principal Strategies and Risks	8
Additional Information About Non-Principal Investment Strategies and Risks	14
Portfolio Holdings Disclosure	16
Management and Organization	17
Shareholder Information	19
Dividends, Distributions and Tax Considerations	22
Financial Intermediary Arrangements	24
Financial Highlights	26
Index/Trademark Licenses/Disclaimers	28

State Street Equity 500 Index Fund

Investment Objective

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Management Fee	0.02%
Distribution and/or Shareholder Service (12b-1) Fees	0.60%
Other Expenses1	0.08%
Total Annual Fund Operating Expenses	0.70%
Less Fee Waivers and/or Expense Reimbursements2	(0.08%)
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	0.62%

Other Expenses have been restated to reflect current fees.

The Fund's investment adviser, SSGA Funds Management, Inc. (the “Adviser” or “SSGA FM”), is contractually obligated until April 30, 2026, separately with respect to each of the Fund and the Portfolio, (i) to waive up to the full amount of the advisory fee payable by the Fund or the Portfolio, and/or (ii) to reimburse the Fund or the Portfolio to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, extraordinary expenses, and distribution, shareholder servicing, and sub-transfer agency fees) exceed 0.02% of the Fund's or the Portfolio's average daily net assets on an annual basis (for avoidance of doubt, the waiver and/or reimbursement is inclusive of all the allocation of expenses from the Portfolio). This waiver and/or reimbursement may not be terminated prior to April 30, 2026 except with approval of the Fund's/Portfolio's Board of Trustees.

Example:

1 year	3 years	5 years	10 years
$63	$216	$382	$863

Portfolio Turnover:

Principal Investment Strategies

Principal Risks

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund's' returns from year-to-year and by showing how the Fund's average annual returns for the periods indicated compared with those of the Index. The bar chart shows how the Class R Shares' returns have varied for each full calendar year shown. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (800) 997-7327 or by visiting our website at www.ssga.com.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	20.34%	Q2 2020
Lowest Quarterly Return	-19.69%	Q1 2020

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Ten Years
Class R Shares
Return Before Taxes	24.24 %	13.77 %	12.33 %
Return After Taxes on Distributions	23.93 %	13.38 %	11.67 %
Return After Taxes on Distributions and Sale of Fund Shares	14.54 %	10.98 %	10.04 %
S&P 500 Index (reflects no deduction for fees, expenses or taxes)	25.02 %	14.53 %	13.10 %

The Fund will make updated performance information, including its current net asset value, available at the Fund's website: www.ssga.com.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund and the Portfolio.

Karl Schneider, CAIA, is a Managing Director of the Adviser and Co-Head of the Systematic Equity Group in the Americas. He joined the Adviser in 1997.

Amy Scofield is a Vice President of the Adviser and a Portfolio Manager in the Systematic Equity Group. She joined the Adviser in 2010.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

To establish an account	$25,000,000
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

Written Requests and Wire Transfers. You may purchase or redeem Fund Shares by written request or wire transfer.

Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Intermediary:

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

Additional Information About Investment Objective, Principal Strategies and Risks

State Street Equity 500 Index Fund Class R

Investment Objective

Principal Investment Strategies

The Fund generally intends to invest in all stocks comprising the S&P 500 in approximate proportion to their weightings in the Index. However, under various circumstances, it may not be possible or practicable to purchase all stocks in those weightings. In those circumstances, the Fund may purchase a sample of the stocks in the Index in proportions expected by SSGA FM to match generally the performance of the Index as a whole. In addition, from time to time, stocks are added to or removed from the Index. The Fund may sell securities that are represented in the Index, or purchase securities that are not yet represented in the Index, in anticipation of their removal from or addition to the Index. Under normal market conditions, the Fund will not invest less than 80% of its total assets in stocks in the Index. Shareholders will receive sixty (60) days' notice prior to a change in the 80% investment policy. For this purpose, “total assets” means net assets plus borrowings, if any. The notional value of the Fund's investments in derivatives or other synthetic instruments that provide exposures comparable, in the judgment of the Adviser, to investments in the Index may be counted toward satisfaction of this 80% policy. In addition, the Fund may invest in equity securities that are not included in the Index, cash and cash equivalents or money market instruments, such as repurchase agreements and money market funds (including money market funds advised by the Adviser).

Additional Information About Risks

The Fund is subject to the following principal risks. The risks are described in alphabetical order and not in the order of importance or potential exposure.

Derivatives Risk. A derivative is a financial contract the value of which depends on, or is derived from, the value of an underlying asset, interest rate, or index. Derivative transactions typically involve leverage and may have significant volatility. It is possible that a derivative transaction will result in a loss greater than the principal amount invested, that changes in the value of a derivative transaction may not correlate perfectly with the underlying asset, and that the Fund may not be able to close out a derivative transaction at a favorable time or price. Risks associated with derivative instruments include potential changes in value in response to interest rate changes or other market developments or as a result of the counterparty's credit quality; the potential for the derivative transaction not to have the effect the Adviser anticipated or a different or less favorable effect than the Adviser anticipated; the failure of the counterparty to the derivative transaction to perform its obligations under the transaction or to settle a trade; possible mispricing or improper valuation of the derivative instrument; imperfect correlation in the value of a derivative with the asset, rate, or index underlying the derivative; the risk that the Fund may be required to post collateral or margin with its counterparty, and will not be able to recover the collateral or margin in the event of the counterparty's insolvency or bankruptcy; the risk that the Fund will experience losses on its derivatives investments and on its other portfolio investments, even when the derivatives investments may be intended in part or entirely to hedge those portfolio investments; the risks specific to the asset underlying the derivative instrument; lack of liquidity for the derivative instrument, including, without limitation, absence of a secondary trading market; the potential for reduced returns to the Fund due to losses on the transaction and an increase in volatility; the potential for the derivative transaction to have the effect of accelerating the recognition of gain; and legal risks arising from the documentation relating to the derivative transaction.

Leveraging Risk. Borrowing transactions, reverse repurchase agreements, certain derivatives transactions, securities lending transactions and other investment transactions such as when-issued, delayed-delivery, or forward commitment transactions may create investment leverage. If the Fund engages in transactions that have a leveraging effect on the Fund's investment portfolio, the value of the Fund will be potentially more volatile and all other risks will tend to be compounded. This is because leverage generally creates investment risk with respect to a larger base of assets than the Fund would otherwise have and so magnifies the effect of any increase or decrease in the value of the Fund's underlying assets. The use of leverage is considered to be a speculative investment practice and may result in losses to the Fund. Certain derivatives have the potential for unlimited loss, regardless of the size of the initial investment. The use of leverage may cause the Fund to liquidate positions when it may not be advantageous to do so to satisfy repayment, interest payment, or margin obligations.

Securities and financial markets may be susceptible to market manipulation or other fraudulent trade practices, which could disrupt the orderly functioning of these markets or adversely affect the values of investments traded in these markets, including investments held by the Fund. To the extent the Fund has focused its investments in the market or index of a particular region, adverse geopolitical and other events could have a disproportionate impact on the Fund.

Market Volatility; Government Intervention Risk. Market dislocations and other external events, such as the failures or near failures of significant financial institutions, dislocations in investment or currency markets, corporate or governmental defaults or credit downgrades, or poor collateral performance, may subject the Fund to significant risk of substantial volatility and loss. Governmental and regulatory authorities have taken, and may in the future take, actions to provide or arrange credit supports to financial institutions whose operations have been compromised by credit market dislocations and to restore liquidity and stability to financial systems in their jurisdictions; the implementation of such governmental interventions and their impact on both the markets generally and the Fund's investment program in particular can be uncertain. Governmental and non-governmental issuers may default on, or be forced to restructure, their debts, and other issuers may face difficulties obtaining credit. Defaults or restructurings by governments or others of their debts could have substantial adverse effects on economies, financial markets, and asset valuations around the world. Federal Reserve or other U.S. or non-U.S. governmental or central bank actions, including interest rate increases or contrary actions by different governments, or investor perception that these efforts are not succeeding, could negatively affect financial markets generally as well as the values and liquidity of certain securities.

Additional Information About Non-Principal Investment Strategies and Risks

Cybersecurity Risk. With the increased use of technologies such as the Internet and the dependence on computer systems to perform business and operational functions, funds (such as the Fund and the Portfolio) and their service providers (including the Adviser) may be prone to operational and information security risks resulting from cyber-attacks and/or technological malfunctions. Furthermore, geopolitical tensions may have increased the scale and sophistication of deliberate cybersecurity attacks, particularly those from nation-states or from entities with nation-state backing. In general, cyber-attacks are deliberate, but unintentional events may have similar effects. Cyber-attacks include, among others, stealing or corrupting data maintained online or digitally, preventing legitimate users from accessing information or services on a website, releasing confidential information without authorization, and causing operational disruption. Successful cyber-attacks against, or security breakdowns of, the Fund, the Portfolio, the Adviser or a custodian, transfer agent, or other affiliated or third-party service provider may adversely affect the Fund or its shareholders. For instance, cyber-attacks or technical malfunctions may interfere with the processing of shareholder or other transactions, affect the Fund's ability to calculate its NAV, cause the release of private shareholder information or confidential Fund information, impede trading, cause reputational damage, and subject the Fund to regulatory fines, penalties or financial losses, reimbursement or other compensation costs, and additional compliance costs. Cyber-attacks or technical malfunctions may render records of Fund assets and transactions, shareholder ownership of Fund Shares, and other data integral to the functioning of the Fund inaccessible or inaccurate or incomplete. The Fund may also incur substantial costs for cybersecurity risk management in order to prevent cyber incidents in the future. The Fund and its shareholders could be negatively impacted as a result. While the Adviser has established business continuity plans and systems designed to minimize the risk of cyber-attacks through the use of technology, processes and controls, there are inherent limitations in such plans and systems, including the possibility that certain risks have not been identified, given the evolving nature of this threat. The use of artificial intelligence (“AI”) and machine learning could exacerbate these risks or result in cyber security incidents that implicate personal data. The Fund relies on third-party service providers for many of its day-to-day operations, and will be subject to the risk that the protections and protocols implemented by those service providers will be ineffective to protect the Fund from cyber-attack. The Adviser does not control the cybersecurity plans and systems put in place by third-party service providers, and such third-party service providers may have limited indemnification obligations to the Adviser or the Fund. Similar types of cybersecurity risks or technical malfunctions also are present for issuers of securities in which the Fund invests, which could result in material adverse consequences for such issuers, and may cause the Fund's investment in such securities to lose value.

Portfolio Holdings Disclosure

The Fund's portfolio holdings disclosure policy is described in the Statement of Additional Information (“SAI”).

Management and Organization

Investment Adviser

A discussion regarding the Board's consideration of the Fund's Investment Advisory Agreement is provided in the Fund's Form N-CSR filing with the SEC for the period ended June 30, 2024.

The professionals primarily responsible for the day-to-day management of the Equity 500 Index II Portfolio and the Equity 500 Index Fund include the following:

Additional information about the portfolio managers' compensation, other accounts managed by the portfolio managers, and the portfolio managers' ownership of the Fund is available in the SAI.

Other Fund Services

The Administrator, Sub-Administrator and Custodian

The Transfer Agent and Dividend Disbursing Agent

SS&C GIDS, Inc. is the Fund's transfer agent and dividend disbursing agent (the “Transfer Agent”).

The Distributor

State Street Global Advisors Funds Distributors, LLC serves as the Fund's distributor (“SSGA FD”) pursuant to the Distribution Agreement between SSGA FD and the Trust.

Additional Information

Shareholder Information

Determination of Net Asset Value

The Fund determines its net asset value (“NAV”) per share once each business day as of the close of regular trading on the New York Stock Exchange (the “NYSE”). Pricing does not occur on NYSE holidays. A business day is one on which the NYSE is open for regular trading. The Federal Reserve is closed on certain holidays on which the NYSE is open. These holidays are Columbus Day and Veterans Day. On these holidays, you will not be able to purchase shares by wiring Federal Funds because Federal Funds wiring does not occur on days when the Federal Reserve is closed. In unusual circumstances, such as an emergency or an unscheduled close or halt of trading on the NYSE, the time at which share prices are determined may be changed. The NAV per share is based on the market value of the investments held in the Fund. The NAV of the Fund's Class R Shares is calculated by dividing the value of the assets of the Fund attributable to its Class R Shares less the liabilities of the Fund attributable to its Class R Shares by the number of Class R Shares outstanding. As noted in this Prospectus, the Fund may invest in securities listed on foreign exchanges, or otherwise traded in a foreign market, and those securities may trade on weekends or other days when the Fund does not price its shares. Consequently, the NAV of the Fund's shares may change on days when shareholders are not able to purchase or redeem the Fund's shares. Purchase and redemption orders for Fund Shares are processed, respectively, at the NAV next determined after the Fund accepts a purchase order or receives a redemption request in good form. The Fund values each security or other investment pursuant to guidelines adopted by the Fund's Board of Trustees. The Board has appointed the Adviser as the valuation designee to fair value securities or other investments pursuant to procedures approved by the Fund's Board of Trustees, under certain limited circumstances. For example, fair value pricing may be used when market quotations are not readily available or reliable, such as when (i) trading for a security is restricted; or (ii) a significant event, as determined by the Adviser, that may affect the value of one or more securities or other investments held by the Fund occurs after the close of a related exchange but before the determination of the Fund's NAV. Attempts to determine the fair value of securities or other investments introduce an element of subjectivity to the pricing of securities or other investments. As a result, the price of a security or other investment determined through fair valuation techniques may differ from the price quoted or published by other sources and may not accurately reflect the price the Fund would have received had it sold the investment. To the extent that the Fund invests in the shares of other registered open-end investment companies that are not traded on an exchange (mutual funds), such shares are valued at their published net asset values per share as reported by the funds. The prospectuses of these funds explain the circumstances under which the funds will use fair value pricing and the effects of using fair value pricing.

Investing in State Street Institutional Investment Trust Shares

Purchasing Shares

Investors pay no sales load to invest in the Class R Shares of the Fund. The price for Fund shares is the NAV per share. Orders received in good form (a purchase order is in good form if it meets the requirements implemented from time to time by the Fund or its Transfer Agent, and for new accounts includes submission of a completed and signed application and all documentation necessary to open an account) will be priced at the NAV next calculated after the order is accepted by the Fund.

The minimum initial investment in the Class R Shares is $25 million, although the Adviser may waive the minimum in its discretion. There is no minimum subsequent investment. The Fund intends to be as fully invested as is practicable; therefore, investments must be made either in Federal Funds (i.e., monies credited to the account of the Fund's custodian bank by a Federal Reserve Bank) or securities (“in-kind”) acceptable to the Adviser. Please consult your tax adviser regarding in-kind transactions. (If you purchase shares by check, your order will not be in good form until the Transfer Agent receives federal funds for the check.) The Fund reserves the right to cease accepting investments at any time or to reject any purchase order.

If you are purchasing through a Financial Intermediary, please contact your Financial Intermediary as their requirements may differ.

Redeeming Shares

If your account is held through an Intermediary, please contact them for additional assistance and advice on how to redeem your shares.

Cost Basis Reporting

About Mail Transactions

Frequent-Trading Limits

As a means to protect each State Street Fund and its shareholders from Excessive Trading:

•

The State Street Funds' distributor has detailed procedures that document the transparency oversight and monitoring processes performed by the State Street Funds' transfer agent.

Delivery of Documents to Accounts Sharing an Address

Unclaimed Property

Many states have unclaimed property rules that provide for transfer to the state (also known as “escheatment”) of unclaimed property under various circumstances. These circumstances include inactivity (e.g., no owner-initiated contact for a certain period), returned mail (e.g., when mail sent to a shareholder is returned by the post office as undeliverable), or a combination of both inactivity and returned mail. If a State Street Fund identifies property as unclaimed, it will attempt to contact the shareholder, but if that attempt is unsuccessful, the account may be considered abandoned and escheated to the state after the passage of a certain period of time (as required by applicable state law).

If you are a resident of the state of Texas, you may designate a representative to receive escheatment notifications by completing and submitting a designation form, which you can find on the website of the Texas Comptroller. Designating such a representative may be beneficial, since Texas law provides that the escheatment period will cease if the representative, after receiving an escheatment notification regarding your account, communicates knowledge of your location and confirms that you have not abandoned your account. You can mail a completed designation form to the Fund (if you hold shares directly with the Fund) or to your financial intermediary (if you do not hold shares directly with the Fund).

Dividends, Distributions and Tax Considerations

For U.S. federal income tax purposes, distributions of investment income generally are taxable to you as ordinary income. Taxes on distributions of capital gains generally are determined by how long the Fund or the Portfolio owned (or is deemed to have owned) the investments that generated them, rather than how long you have owned your Fund Shares. Distributions of net capital gains (that is, the excess of net long-term capital gains over net short-term capital losses) from the sale of investments that the Fund or the Portfolio owned (or is deemed to have owned) for more than one year that are properly reported by the Fund, or the Portfolio and the Fund, as capital gain dividends generally will be treated as long-term capital gain includible in your net capital gain and taxed to individuals at reduced rates. Distributions of gains from investments that the Fund or the Portfolio owned (or is deemed to have owned) for one year or less generally will be taxable to you as ordinary income when distributed to you by the Fund. Distributions of investment income properly reported by the Fund, or the Portfolio and the Fund, as derived from “qualified dividend income,” which will not include income from the Fund's or the Portfolio's portfolio securities on loan, are taxed to individuals at the rates applicable to net capital gain, provided holding period and other requirements are met by the shareholder, the Fund, and if applicable, the Portfolio. Distributions are taxable to you even if they are paid from income or gains earned by the Fund or the Portfolio before your investment (and thus were included in the price you paid for your shares). Distributions may also be subject to state and local taxes and are taxable whether you receive them in cash or reinvest them in additional shares. Distributions in excess of the Fund's current and accumulated earnings and profits are treated as a return of capital to the extent of your basis in the Fund's shares, and, in general, as capital gain thereafter.

An additional 3.8% Medicare contribution tax is imposed on the “net investment income” of individuals, estates and trusts to the extent their income exceeds certain threshold amounts. Net investment income generally includes for this purpose dividends paid by the Fund, including any capital gain dividends, and net gains recognized on the redemption (or other taxable disposition) of Fund Shares.

Cost Basis Reporting. U.S. Treasury regulations mandate cost basis reporting to shareholders and the IRS for redemptions of Fund Shares acquired on or after January 1, 2012 (“Post Effective Date Shares”). If you acquire and hold shares directly through the Fund and not through a Financial Intermediary, SS&C GIDS, Inc. will use a default average cost basis methodology for tracking and reporting your cost basis on Post Effective Date Shares, unless you request, in writing, another cost basis reporting methodology.

Financial Intermediary Arrangements

Distribution Arrangements and Rule 12b-1 Fees

The Fund has adopted a distribution plan pursuant to Rule 12b-1 under the 1940 Act under which the Fund may compensate SSGA FD (or others) for services in connection with the distribution of the Fund's Class R Shares and for services provided to Fund shareholders (the “Plan”). The Plan calls for payments at an annual rate (based on average daily net assets) of 0.60% of the Fund's net assets attributable to its Class R Shares. Because these fees are paid out of the assets of the Fund attributable to its Class R Shares on an ongoing basis, they will increase the cost of your investment and may cost you more over time than paying other types of sales charges.

The Fund may pay distribution fees and other amounts described in this Prospectus at a time when shares of the Fund are unavailable for purchase.

Other Payments to Financial Intermediaries

The Financial Intermediary is often compensated by SSGA FD or its affiliates for the services it performs and in such cases is typically paid continually over time, during the period when the Financial Intermediary's clients hold investments in the Fund. The amount of continuing compensation paid by SSGA FD or its affiliates to different Financial Intermediaries for distribution and/or shareholder services varies. Any compensation is typically a percentage of the value of the Financial Intermediary's clients' investments in the Fund or a per account fee. The variation in compensation may, but will not necessarily, reflect enhanced or additional services provided by the Financial Intermediary.

If you invest through a Financial Intermediary and meet the eligibility criteria for more than one share class, you should discuss with your Financial Intermediary which share class is appropriate for you. Your financial adviser and the Financial Intermediary employing him or her may have an incentive to recommend one share class over another, when you are eligible to invest in more than one share class. Please speak with your financial adviser to learn more about the total amounts paid to your financial adviser and his or her firm by the Fund or its affiliates with respect to the different share classes offered by the Fund.

SSGA FD and its affiliates (including SSGA FM), at their own expense and out of their own assets, may also provide other compensation to Financial Intermediaries in connection with sales of the Fund's shares or the servicing of shareholders or shareholder accounts. Such compensation may include, but is not limited to, financial assistance to Financial Intermediaries in connection with conferences, sales, or training programs for their employees; seminars for the public; advertising or sales campaigns; or other Financial Intermediary-sponsored special events. In some instances, this compensation may be made available only to certain Financial Intermediaries whose representatives have sold or are expected to sell significant amounts of shares. Dealers may not use sales of the Fund's shares to qualify for this compensation to the extent prohibited by the laws or rules of any state or any self-regulatory agency, such as Financial Industry Regulatory Authority, Inc. (“FINRA”).

Financial Highlights

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET EQUITY 500 INDEX FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class R Shares
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20 (a)
Net asset value, beginning of period	$356.37	$287.26	$358.56	$286.68	$246.80
Income (loss) from investment operations:
Net investment income (loss) (b)	4.21	3.46	1.06	2.52	2.41
Net realized and unrealized gain (loss)	82.29	69.84	(68.05 )	77.04	41.07
Total from investment operations	86.50	73.30	(66.99 )	79.56	43.48
Contribution from affiliates	—	—	0.13	—	—
Distributions to shareholders from:
Net investment income	(4.40 )	(2.98 )	(1.37 )	(2.73 )	(2.80 )
Net realized gains	—	(1.21 )	(3.07 )	(4.95 )	(0.80 )
Total distributions	(4.40 )	(4.19 )	(4.44 )	(7.68 )	(3.60 )
Net asset value, end of period	$438.47	$356.37	$287.26	$358.56	$286.68
Total return (c)	24.24 %	25.51 %	(18.64 )%(d)	27.74 %	17.63 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$38,882	$34,017	$27,008	$39,359	$35,839
Ratios to Average Net Assets:
Total expenses (e)	0.68 %	0.69 %	0.68 %	0.70 %	0.71 %
Net expenses (e)	0.60 %	0.60 %	0.60 %	0.62 %	0.62 %
Net investment income (loss)	1.04 %	1.08 %	0.34 %	0.78 %	0.98 %
Portfolio turnover rate (f)	4 %	4 %	2 %	6 %	6 %

(a)	On April 17, 2020, the State Street Equity 500 Index Fund underwent a 1-for-10 reverse share split. The per share data presented here have been retroactively adjusted to reflect this split.
(b)	Net investment income per share is calculated using the average shares method.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(d)	If the affiliates had not made contributions during the year ended December 31, 2022, the total return would have been (18.70)%.
(e)	Ratio does not include the expenses of the State Street Equity 500 Index II Portfolio.
(f)	Portfolio turnover rate is from the State Street Equity 500 Index II Portfolio.

Index/Trademark Licenses/Disclaimers

Contacting the State Street Funds

Online:	www.ssga.com	24 hours a day, 7 days a week
Phone:	(800) 647-7327	Monday – Friday 8:00 am – 6:00 pm EST

Written requests should be sent to:

Regular mail	Overnight/Registered, Express, Certified Mail
State Street Funds P.O. Box 219737 Kansas City, MO 64121-9737	State Street Funds 801 Pennsylvania Avenue, Suite 219737 Kansas City, MO 64105-1307

For more information about the Fund:

The Fund's SAI includes additional information about the Fund and is incorporated by reference into this document. Additional information about the Fund's investments is available in the Fund's most recent annual and semi-annual reports to shareholders and in the Fund's Form N-CSR filing. In the Fund's annual report, you will find a discussion of the market conditions and investment strategies that significantly affected the Fund's performance during its last fiscal year. In the Fund's Form N-CSR, you will find the Fund's annual and semi-annual financial statements. The Fund's SAI is available, without charge, upon request. The Fund's annual and semi-annual reports are available, without charge, upon request. Shareholders in the Fund may make inquiries to the Fund to receive such information by calling (800) 997-7327 or the customer service center at the telephone number shown in the accompanying contract prospectus, if applicable. The Fund's Prospectus, SAI, and the annual and semi-annual reports to shareholders and other information such as the Fund's financial statements are available, free of charge, on the Fund's website at www.ssga.com.

SSGA Funds Management, Inc

ONE IRON STREET

BOSTON, MASSACHUSETTS 02210

SSITCLRSTATPROThe State Street Institutional Investment Trust's Investment Company Act File Number is 811-09819.

Prospectus

April 30, 2025

State Street Institutional
Investment Trust

State Street Equity 500 Index Fund: Service Shares (STBIX)

The U.S. Securities and Exchange Commission has not approved or disapproved these securities or passed upon the adequacy of this Prospectus. Any representation to the contrary is a criminal offense.

An investment in the State Street Equity 500 Index Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

The Fund may offer multiple classes of shares. This Prospectus covers only the Service Shares.

TABLE OF CONTENTS

Fund Summary	1
State Street Equity 500 Index Fund	1
Additional Information About Investment Objective, Principal Strategies and Risks	8
Additional Information About Non-Principal Investment Strategies and Risks	14
Portfolio Holdings Disclosure	16
Management and Organization	17
Shareholder Information	19
Dividends, Distributions and Tax Considerations	22
Financial Intermediary Arrangements	24
Financial Highlights	26
Index/Trademark Licenses/Disclaimers	28

State Street Equity 500 Index Fund

Investment Objective

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Management Fee	0.02%
Distribution and/or Shareholder Service (12b-1) Fees	0.25%
Other Expenses1	0.08%
Total Annual Fund Operating Expenses	0.35%
Less Fee Waivers and/or Expense Reimbursements2	(0.08%)
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	0.27%

Other Expenses have been restated to reflect current fees.

The Fund's investment adviser, SSGA Funds Management, Inc. (the “Adviser” or “SSGA FM”), is contractually obligated until April 30, 2026, separately with respect to each of the Fund and the Portfolio, (i) to waive up to the full amount of the advisory fee payable by the Fund or the Portfolio, and/or (ii) to reimburse the Fund or the Portfolio to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, extraordinary expenses, and distribution, shareholder servicing, and sub-transfer agency fees) exceed 0.02% of the Fund's or the Portfolio's average daily net assets on an annual basis (for avoidance of doubt, the waiver and/or reimbursement is inclusive of all the allocation of expenses from the Portfolio). This waiver and/or reimbursement may not be terminated prior to April 30, 2026 except with approval of the Fund's/Portfolio's Board of Trustees.

Example:

1 year	3 years	5 years	10 years
$28	$104	$188	$435

Portfolio Turnover:

Principal Investment Strategies

Principal Risks

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund's' returns from year-to-year and by showing how the Fund's average annual returns for the periods indicated compared with those of the Index. The bar chart shows how the Service Shares' returns have varied for each full calendar year shown. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (800) 997-7327 or by visiting our website at www.ssga.com.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	20.46%	Q2 2020
Lowest Quarterly Return	-19.62%	Q1 2020

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Ten Years
Service Shares
Return Before Taxes	24.68 %	14.18 %	12.73 %
Return After Taxes on Distributions	24.25 %	13.68 %	11.97 %
Return After Taxes on Distributions and Sale of Fund Shares	14.87 %	11.29 %	10.34 %
S&P 500 Index (reflects no deduction for fees, expenses or taxes)	25.02 %	14.53 %	13.10 %

The Fund will make updated performance information, including its current net asset value, available at the Fund's website: www.ssga.com.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund and the Portfolio.

Karl Schneider, CAIA, is a Managing Director of the Adviser and Co-Head of the Systematic Equity Group in the Americas. He joined the Adviser in 1997.

Amy Scofield is a Vice President of the Adviser and a Portfolio Manager in the Systematic Equity Group. She joined the Adviser in 2010.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

To establish an account	$25,000,000
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

Written Requests and Wire Transfers. You may purchase or redeem Fund Shares by written request or wire transfer.

Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Intermediary:

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

Additional Information About Investment Objective, Principal Strategies and Risks

State Street Equity 500 Index Fund Service Shares

Investment Objective

Principal Investment Strategies

The Fund generally intends to invest in all stocks comprising the S&P 500 in approximate proportion to their weightings in the Index. However, under various circumstances, it may not be possible or practicable to purchase all stocks in those weightings. In those circumstances, the Fund may purchase a sample of the stocks in the Index in proportions expected by SSGA FM to match generally the performance of the Index as a whole. In addition, from time to time, stocks are added to or removed from the Index. The Fund may sell securities that are represented in the Index, or purchase securities that are not yet represented in the Index, in anticipation of their removal from or addition to the Index. Under normal market conditions, the Fund will not invest less than 80% of its total assets in stocks in the Index. Shareholders will receive sixty (60) days' notice prior to a change in the 80% investment policy. For this purpose, “total assets” means net assets plus borrowings, if any. The notional value of the Fund's investments in derivatives or other synthetic instruments that provide exposures comparable, in the judgment of the Adviser, to investments in the Index may be counted toward satisfaction of this 80% policy. In addition, the Fund may invest in equity securities that are not included in the Index, cash and cash equivalents or money market instruments, such as repurchase agreements and money market funds (including money market funds advised by the Adviser).

Additional Information About Risks

The Fund is subject to the following principal risks. The risks are described in alphabetical order and not in the order of importance or potential exposure.

Derivatives Risk. A derivative is a financial contract the value of which depends on, or is derived from, the value of an underlying asset, interest rate, or index. Derivative transactions typically involve leverage and may have significant volatility. It is possible that a derivative transaction will result in a loss greater than the principal amount invested, that changes in the value of a derivative transaction may not correlate perfectly with the underlying asset, and that the Fund may not be able to close out a derivative transaction at a favorable time or price. Risks associated with derivative instruments include potential changes in value in response to interest rate changes or other market developments or as a result of the counterparty's credit quality; the potential for the derivative transaction not to have the effect the Adviser anticipated or a different or less favorable effect than the Adviser anticipated; the failure of the counterparty to the derivative transaction to perform its obligations under the transaction or to settle a trade; possible mispricing or improper valuation of the derivative instrument; imperfect correlation in the value of a derivative with the asset, rate, or index underlying the derivative; the risk that the Fund may be required to post collateral or margin with its counterparty, and will not be able to recover the collateral or margin in the event of the counterparty's insolvency or bankruptcy; the risk that the Fund will experience losses on its derivatives investments and on its other portfolio investments, even when the derivatives investments may be intended in part or entirely to hedge those portfolio investments; the risks specific to the asset underlying the derivative instrument; lack of liquidity for the derivative instrument, including, without limitation, absence of a secondary trading market; the potential for reduced returns to the Fund due to losses on the transaction and an increase in volatility; the potential for the derivative transaction to have the effect of accelerating the recognition of gain; and legal risks arising from the documentation relating to the derivative transaction.

Leveraging Risk. Borrowing transactions, reverse repurchase agreements, certain derivatives transactions, securities lending transactions and other investment transactions such as when-issued, delayed-delivery, or forward commitment transactions may create investment leverage. If the Fund engages in transactions that have a leveraging effect on the Fund's investment portfolio, the value of the Fund will be potentially more volatile and all other risks will tend to be compounded. This is because leverage generally creates investment risk with respect to a larger base of assets than the Fund would otherwise have and so magnifies the effect of any increase or decrease in the value of the Fund's underlying assets. The use of leverage is considered to be a speculative investment practice and may result in losses to the Fund. Certain derivatives have the potential for unlimited loss, regardless of the size of the initial investment. The use of leverage may cause the Fund to liquidate positions when it may not be advantageous to do so to satisfy repayment, interest payment, or margin obligations.

Securities and financial markets may be susceptible to market manipulation or other fraudulent trade practices, which could disrupt the orderly functioning of these markets or adversely affect the values of investments traded in these markets, including investments held by the Fund. To the extent the Fund has focused its investments in the market or index of a particular region, adverse geopolitical and other events could have a disproportionate impact on the Fund.

Market Volatility; Government Intervention Risk. Market dislocations and other external events, such as the failures or near failures of significant financial institutions, dislocations in investment or currency markets, corporate or governmental defaults or credit downgrades, or poor collateral performance, may subject the Fund to significant risk of substantial volatility and loss. Governmental and regulatory authorities have taken, and may in the future take, actions to provide or arrange credit supports to financial institutions whose operations have been compromised by credit market dislocations and to restore liquidity and stability to financial systems in their jurisdictions; the implementation of such governmental interventions and their impact on both the markets generally and the Fund's investment program in particular can be uncertain. Governmental and non-governmental issuers may default on, or be forced to restructure, their debts, and other issuers may face difficulties obtaining credit. Defaults or restructurings by governments or others of their debts could have substantial adverse effects on economies, financial markets, and asset valuations around the world. Federal Reserve or other U.S. or non-U.S. governmental or central bank actions, including interest rate increases or contrary actions by different governments, or investor perception that these efforts are not succeeding, could negatively affect financial markets generally as well as the values and liquidity of certain securities.

Additional Information About Non-Principal Investment Strategies and Risks

Cybersecurity Risk. With the increased use of technologies such as the Internet and the dependence on computer systems to perform business and operational functions, funds (such as the Fund and the Portfolio) and their service providers (including the Adviser) may be prone to operational and information security risks resulting from cyber-attacks and/or technological malfunctions. Furthermore, geopolitical tensions may have increased the scale and sophistication of deliberate cybersecurity attacks, particularly those from nation-states or from entities with nation-state backing. In general, cyber-attacks are deliberate, but unintentional events may have similar effects. Cyber-attacks include, among others, stealing or corrupting data maintained online or digitally, preventing legitimate users from accessing information or services on a website, releasing confidential information without authorization, and causing operational disruption. Successful cyber-attacks against, or security breakdowns of, the Fund, the Portfolio, the Adviser or a custodian, transfer agent, or other affiliated or third-party service provider may adversely affect the Fund or its shareholders. For instance, cyber-attacks or technical malfunctions may interfere with the processing of shareholder or other transactions, affect the Fund's ability to calculate its NAV, cause the release of private shareholder information or confidential Fund information, impede trading, cause reputational damage, and subject the Fund to regulatory fines, penalties or financial losses, reimbursement or other compensation costs, and additional compliance costs. Cyber-attacks or technical malfunctions may render records of Fund assets and transactions, shareholder ownership of Fund Shares, and other data integral to the functioning of the Fund inaccessible or inaccurate or incomplete. The Fund may also incur substantial costs for cybersecurity risk management in order to prevent cyber incidents in the future. The Fund and its shareholders could be negatively impacted as a result. While the Adviser has established business continuity plans and systems designed to minimize the risk of cyber-attacks through the use of technology, processes and controls, there are inherent limitations in such plans and systems, including the possibility that certain risks have not been identified, given the evolving nature of this threat. The use of artificial intelligence (“AI”) and machine learning could exacerbate these risks or result in cyber security incidents that implicate personal data. The Fund relies on third-party service providers for many of its day-to-day operations, and will be subject to the risk that the protections and protocols implemented by those service providers will be ineffective to protect the Fund from cyber-attack. The Adviser does not control the cybersecurity plans and systems put in place by third-party service providers, and such third-party service providers may have limited indemnification obligations to the Adviser or the Fund. Similar types of cybersecurity risks or technical malfunctions also are present for issuers of securities in which the Fund invests, which could result in material adverse consequences for such issuers, and may cause the Fund's investment in such securities to lose value.

Portfolio Holdings Disclosure

The Fund's portfolio holdings disclosure policy is described in the Statement of Additional Information (“SAI”).

Management and Organization

Investment Adviser

A discussion regarding the Board's consideration of the Fund's Investment Advisory Agreement is provided in the Fund's Form N-CSR filing with the SEC for the period ended June 30, 2024.

The professionals primarily responsible for the day-to-day management of the Equity 500 Index II Portfolio and the Equity 500 Index Fund include the following:

Additional information about the portfolio managers' compensation, other accounts managed by the portfolio managers, and the portfolio managers' ownership of the Fund is available in the SAI.

Other Fund Services

The Administrator, Sub-Administrator and Custodian

The Transfer Agent and Dividend Disbursing Agent

SS&C GIDS, Inc. is the Fund's transfer agent and dividend disbursing agent (the “Transfer Agent”).

The Distributor

State Street Global Advisors Funds Distributors, LLC serves as the Fund's distributor (“SSGA FD”) pursuant to the Distribution Agreement between SSGA FD and the Trust.

Additional Information

Shareholder Information

Determination of Net Asset Value

The Fund determines its net asset value (“NAV”) per share once each business day as of the close of regular trading on the New York Stock Exchange (the “NYSE”). Pricing does not occur on NYSE holidays. A business day is one on which the NYSE is open for regular trading. The Federal Reserve is closed on certain holidays on which the NYSE is open. These holidays are Columbus Day and Veterans Day. On these holidays, you will not be able to purchase shares by wiring Federal Funds because Federal Funds wiring does not occur on days when the Federal Reserve is closed. In unusual circumstances, such as an emergency or an unscheduled close or halt of trading on the NYSE, the time at which share prices are determined may be changed. The NAV per share is based on the market value of the investments held in the Fund. The NAV of the Fund's Service Shares is calculated by dividing the value of the assets of the Fund attributable to its Service Shares less the liabilities of the Fund attributable to its Service Shares by the number of Service Shares outstanding. As noted in this Prospectus, the Fund may invest in securities listed on foreign exchanges, or otherwise traded in a foreign market, and those securities may trade on weekends or other days when the Fund does not price its shares. Consequently, the NAV of the Fund's shares may change on days when shareholders are not able to purchase or redeem the Fund's shares. Purchase and redemption orders for Fund Shares are processed, respectively, at the NAV next determined after the Fund accepts a purchase order or receives a redemption request in good form. The Fund values each security or other investment pursuant to guidelines adopted by the Fund's Board of Trustees. The Board has appointed the Adviser as the valuation designee to fair value securities or other investments pursuant to procedures approved by the Fund's Board of Trustees, under certain limited circumstances. For example, fair value pricing may be used when market quotations are not readily available or reliable, such as when (i) trading for a security is restricted; or (ii) a significant event, as determined by the Adviser, that may affect the value of one or more securities or other investments held by the Fund occurs after the close of a related exchange but before the determination of the Fund's NAV. Attempts to determine the fair value of securities or other investments introduce an element of subjectivity to the pricing of securities or other investments. As a result, the price of a security or other investment determined through fair valuation techniques may differ from the price quoted or published by other sources and may not accurately reflect the price the Fund would have received had it sold the investment. To the extent that the Fund invests in the shares of other registered open-end investment companies that are not traded on an exchange (mutual funds), such shares are valued at their published net asset values per share as reported by the funds. The prospectuses of these funds explain the circumstances under which the funds will use fair value pricing and the effects of using fair value pricing.

Investing in State Street Institutional Investment Trust Shares

Purchasing Shares

Investors pay no sales load to invest in the Service Shares of the Fund. The price for Fund shares is the NAV per share. Orders received in good form (a purchase order is in good form if it meets the requirements implemented from time to time by the Fund or its Transfer Agent, and for new accounts includes submission of a completed and signed application and all documentation necessary to open an account) will be priced at the NAV next calculated after the order is accepted by the Fund.

The minimum initial investment in the Service Shares is $25 million, although the Adviser may waive the minimum in its discretion. There is no minimum subsequent investment. The Fund intends to be as fully invested as is practicable; therefore, investments must be made either in Federal Funds (i.e., monies credited to the account of the Fund's custodian bank by a Federal Reserve Bank) or securities (“in-kind”) acceptable to the Adviser. Please consult your tax adviser regarding in-kind transactions. (If you purchase shares by check, your order will not be in good form until the Transfer Agent receives federal funds for the check.) The Fund reserves the right to cease accepting investments at any time or to reject any purchase order.

If you are purchasing through a Financial Intermediary, please contact your Financial Intermediary as their requirements may differ.

Redeeming Shares

If your account is held through an Intermediary, please contact them for additional assistance and advice on how to redeem your shares.

Cost Basis Reporting

About Mail Transactions

Frequent-Trading Limits

As a means to protect each State Street Fund and its shareholders from Excessive Trading:

•

The State Street Funds' distributor has detailed procedures that document the transparency oversight and monitoring processes performed by the State Street Funds' transfer agent.

Delivery of Documents to Accounts Sharing an Address

Unclaimed Property

Many states have unclaimed property rules that provide for transfer to the state (also known as “escheatment”) of unclaimed property under various circumstances. These circumstances include inactivity (e.g., no owner-initiated contact for a certain period), returned mail (e.g., when mail sent to a shareholder is returned by the post office as undeliverable), or a combination of both inactivity and returned mail. If a State Street Fund identifies property as unclaimed, it will attempt to contact the shareholder, but if that attempt is unsuccessful, the account may be considered abandoned and escheated to the state after the passage of a certain period of time (as required by applicable state law).

If you are a resident of the state of Texas, you may designate a representative to receive escheatment notifications by completing and submitting a designation form, which you can find on the website of the Texas Comptroller. Designating such a representative may be beneficial, since Texas law provides that the escheatment period will cease if the representative, after receiving an escheatment notification regarding your account, communicates knowledge of your location and confirms that you have not abandoned your account. You can mail a completed designation form to the Fund (if you hold shares directly with the Fund) or to your financial intermediary (if you do not hold shares directly with the Fund).

Dividends, Distributions and Tax Considerations

For U.S. federal income tax purposes, distributions of investment income generally are taxable to you as ordinary income. Taxes on distributions of capital gains generally are determined by how long the Fund or the Portfolio owned (or is deemed to have owned) the investments that generated them, rather than how long you have owned your Fund Shares. Distributions of net capital gains (that is, the excess of net long-term capital gains over net short-term capital losses) from the sale of investments that the Fund or the Portfolio owned (or is deemed to have owned) for more than one year that are properly reported by the Fund, or the Portfolio and the Fund, as capital gain dividends generally will be treated as long-term capital gain includible in your net capital gain and taxed to individuals at reduced rates. Distributions of gains from investments that the Fund or the Portfolio owned (or is deemed to have owned) for one year or less generally will be taxable to you as ordinary income when distributed to you by the Fund. Distributions of investment income properly reported by the Fund, or the Portfolio and the Fund, as derived from “qualified dividend income,” which will not include income from the Fund's or the Portfolio's portfolio securities on loan, are taxed to individuals at the rates applicable to net capital gain, provided holding period and other requirements are met by the shareholder, the Fund, and if applicable, the Portfolio. Distributions are taxable to you even if they are paid from income or gains earned by the Fund or the Portfolio before your investment (and thus were included in the price you paid for your shares). Distributions may also be subject to state and local taxes and are taxable whether you receive them in cash or reinvest them in additional shares. Distributions in excess of the Fund's current and accumulated earnings and profits are treated as a return of capital to the extent of your basis in the Fund's shares, and, in general, as capital gain thereafter.

An additional 3.8% Medicare contribution tax is imposed on the “net investment income” of individuals, estates and trusts to the extent their income exceeds certain threshold amounts. Net investment income generally includes for this purpose dividends paid by the Fund, including any capital gain dividends, and net gains recognized on the redemption (or other taxable disposition) of Fund Shares.

Cost Basis Reporting. U.S. Treasury regulations mandate cost basis reporting to shareholders and the IRS for redemptions of Fund Shares acquired on or after January 1, 2012 (“Post Effective Date Shares”). If you acquire and hold shares directly through the Fund and not through a Financial Intermediary, SS&C GIDS, Inc. will use a default average cost basis methodology for tracking and reporting your cost basis on Post Effective Date Shares, unless you request, in writing, another cost basis reporting methodology.

Financial Intermediary Arrangements

Distribution Arrangements and Rule 12b-1 Fees

The Fund has adopted a distribution plan pursuant to Rule 12b-1 under the 1940 Act under which the Fund may compensate SSGA FD (or others) for services in connection with the distribution of the Fund's Service Shares and for services provided to Fund shareholders (the “Plan”). The Plan calls for payments at an annual rate (based on average daily net assets) of 0.25% of the Fund's net assets attributable to its Service Shares. Because these fees are paid out of the assets of the Fund attributable to its Service Shares on an ongoing basis, they will increase the cost of your investment and may cost you more over time than paying other types of sales charges.

The Fund may pay distribution fees and other amounts described in this Prospectus at a time when shares of the Fund are unavailable for purchase.

Other Payments to Financial Intermediaries

The Financial Intermediary is often compensated by SSGA FD or its affiliates for the services it performs and in such cases is typically paid continually over time, during the period when the Financial Intermediary's clients hold investments in the Fund. The amount of continuing compensation paid by SSGA FD or its affiliates to different Financial Intermediaries for distribution and/or shareholder services varies. Any compensation is typically a percentage of the value of the Financial Intermediary's clients' investments in the Fund or a per account fee. The variation in compensation may, but will not necessarily, reflect enhanced or additional services provided by the Financial Intermediary.

If you invest through a Financial Intermediary and meet the eligibility criteria for more than one share class, you should discuss with your Financial Intermediary which share class is appropriate for you. Your financial adviser and the Financial Intermediary employing him or her may have an incentive to recommend one share class over another, when you are eligible to invest in more than one share class. Please speak with your financial adviser to learn more about the total amounts paid to your financial adviser and his or her firm by the Fund or its affiliates with respect to the different share classes offered by the Fund.

SSGA FD and its affiliates (including SSGA FM), at their own expense and out of their own assets, may also provide other compensation to Financial Intermediaries in connection with sales of the Fund's shares or the servicing of shareholders or shareholder accounts. Such compensation may include, but is not limited to, financial assistance to Financial Intermediaries in connection with conferences, sales, or training programs for their employees; seminars for the public; advertising or sales campaigns; or other Financial Intermediary-sponsored special events. In some instances, this compensation may be made available only to certain Financial Intermediaries whose representatives have sold or are expected to sell significant amounts of shares. Dealers may not use sales of the Fund's shares to qualify for this compensation to the extent prohibited by the laws or rules of any state or any self-regulatory agency, such as Financial Industry Regulatory Authority, Inc. (“FINRA”).

Financial Highlights

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET EQUITY 500 INDEX FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Service Shares
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20 (a)
Net asset value, beginning of period	$356.24	$287.16	$358.44	$286.59	$246.70
Income (loss) from investment operations:
Net investment income (loss) (b)	6.11	6.39	2.40	0.94	3.33
Net realized and unrealized gain (loss)	81.95	68.15	(68.34 )	79.89	41.18
Total from investment operations	88.06	74.54	(65.94 )	80.83	44.51
Contribution from affiliates	—	—	0.13	—	—
Distributions to shareholders from:
Net investment income	(6.00 )	(4.25 )	(2.40 )	(4.03 )	(3.82 )
Net realized gains	—	(1.21 )	(3.07 )	(4.95 )	(0.80 )
Total distributions	(6.00 )	(5.46 )	(5.47 )	(8.98 )	(4.62 )
Net asset value, end of period	$438.30	$356.24	$287.16	$358.44	$286.59
Total return (c)	24.68 %	25.95 %	(18.36 )%(d)	28.19 %	18.06 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$12,099	$12,036	$6,431	$8,134	$22,997
Ratios to Average Net Assets:
Total expenses (e)	0.33 %	0.34 %	0.33 %	0.35 %	0.36 %
Net expenses (e)	0.25 %	0.25 %	0.25 %	0.27 %	0.27 %
Net investment income (loss)	1.51 %	1.97 %	0.77 %	0.29 %	1.35 %
Portfolio turnover rate (f)	4 %	4 %	2 %	6 %	6 %

(a)	On April 17, 2020, the State Street Equity 500 Index Fund underwent a 1-for-10 reverse share split. The per share data presented here have been retroactively adjusted to reflect this split.
(b)	Net investment income per share is calculated using the average shares method.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(d)	If the affiliates had not made contributions during the year ended December 31, 2022, the total return would have been (18.40)%.
(e)	Ratio does not include the expenses of the State Street Equity 500 Index II Portfolio.
(f)	Portfolio turnover rate is from the State Street Equity 500 Index II Portfolio.

Index/Trademark Licenses/Disclaimers

Contacting the State Street Funds

Online:	www.ssga.com	24 hours a day, 7 days a week
Phone:	(800) 647-7327	Monday – Friday 8:00 am – 6:00 pm EST

Written requests should be sent to:

Regular mail	Overnight/Registered, Express, Certified Mail
State Street Funds P.O. Box 219737 Kansas City, MO 64121-9737	State Street Funds 801 Pennsylvania Avenue, Suite 219737 Kansas City, MO 64105-1307

For more information about the Fund:

SSGA Funds Management, Inc

ONE IRON STREET

BOSTON, MASSACHUSETTS 02210

SSITSERVSTATPROThe State Street Institutional Investment Trust's Investment Company Act File Number is 811-09819.

Prospectus

April 30, 2025

State Street Institutional
Investment Trust

State Street Institutional Liquid Reserves Government Money Market Fund

(formerly State Street Institutional Liquid Reserves Fund)

Institutional Class (SSHXX) Administration Class (SSYXX) Investment Class (SSVXX) Investor Class (SSZXX) Premier Class (SSIXX) Opportunity Class (OPIXX)

State Street Institutional Treasury Money Market Fund

Institutional Class (SSJXX) Administration Class (SSKXX) Investment Class (TRVXX) Investor Class (SSNXX) Premier Class (TRIXX) Opportunity Class (OPRXX)

State Street Institutional Treasury Plus Money Market Fund

Institutional Class (SAJXX) Administration Class (SSQXX) Investment Class (TPVXX) Investor Class (SAEXX) Premier Class (TPIXX) Opportunity Class (OPTXX)

State Street Institutional U.S. Government Money Market Fund

Institutional Class (SAHXX) Administration Class (SALXX) Investment Class (GVVXX) Investor Class (SAMXX) Premier Class (GVMXX) Opportunity Class (OPGXX)

The U.S. Securities and Exchange Commission has not approved or disapproved these securities or passed upon the adequacy of this Prospectus. Any representation to the contrary is a criminal offense.

An investment in any of the Funds offered by this Prospectus is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Each Fund may offer multiple classes of shares. This Prospectus covers only the Institutional Class, Administration Class, Investment Class, Investor Class, Premier Class and Opportunity Class Shares of the applicable Funds.

None of State Street Corporation, State Street Bank and Trust Company, State Street Global Advisors, SSGA Funds Management, Inc. or their affiliates (“State Street Entities”) guarantee the value of your investment at $1.00 per share or any other target share price. Investors should have no expectation of capital support to the Funds from State Street Entities.

TABLE OF CONTENTS

Fund Summaries	4
State Street Institutional Liquid Reserves Government Money Market Fund	4
State Street Institutional Treasury Money Market Fund	11
State Street Institutional Treasury Plus Money Market Fund	17
State Street Institutional U.S. Government Money Market Fund	23
Additional Information About Investment Objectives, Principal Strategies and Risks	30
Additional Information About Non-Principal Investment Strategies and Risks	38
Portfolio Holdings Disclosure	39
Management and Organization	40
Shareholder Information	42
Dividends, Distributions and Tax Considerations	49
Financial Intermediary Arrangements	50
Financial Highlights	53

State Street Institutional Liquid Reserves Government Money Market Fund

Investment Objective

The investment objective of the State Street Institutional Liquid Reserves Government Money Market Fund (the “ILR Government Fund” or sometimes referred to in context as the “Fund”) is to seek to maximize current income, to the extent consistent with the preservation of capital and liquidity, by investing in U.S. dollar-denominated money market securities.

Fees and Expenses of the Fund

The tables below describe the fees and expenses that you may pay if you buy, hold, and sell shares of the ILR Government Fund (“Fund Shares”). You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. The expenses shown in the table and the Example reflect the expenses of the Fund and the Fund's proportionate share of the expenses of the State Street U.S. Government Money Market Portfolio (the “U.S. Government Portfolio” or sometimes referred to in context as the “Portfolio”).

Shareholder Fees (fees paid directly from your investment)

	Institutional	Administration	Investment	Investor	Premier	Opportunity
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None	None	None	None	None	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None	None	None	None	None	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

	Institutional	Administration	Investment	Investor	Premier	Opportunity
Management Fee	0.05%	0.05%	0.05%	0.05%	0.05%	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%	0.05%	0.10%	0.00%	0.00%	0.00%
Other Expenses1	0.10%	0.27%	0.32%	0.15%	0.07%	0.10%
Total Annual Fund Operating Expenses1	0.15%	0.37%	0.47%	0.20%	0.12%	0.15%

“Other Expenses” and “Total Annual Fund Operating Expenses” for the Administration Class, Investment Class, and Investor Class shares have been restated to reflect current fees.

Example:

	1 year	3 years	5 years	10 years
Institutional	$15	$48	$85	$192
Administration	$38	$119	$208	$468
Investment	$48	$151	$263	$591
Investor	$20	$64	$113	$255
Premier	$12	$39	$68	$154
Opportunity	$15	$48	$85	$192

Principal Investment Strategies

The ILR Government Fund is a government money market fund and invests only in obligations issued or guaranteed as to principal and/or interest, as applicable, by the U.S. government or its agencies and instrumentalities, as well as repurchase agreements secured by such instruments. The Fund will provide shareholders with at least sixty (60) days' prior notice of any change in this investment policy. The Fund may hold a portion of its assets in cash pending investment, to satisfy redemption requests or to meet the Fund's other cash management needs.

The Fund follows a disciplined investment process that attempts to provide stability of principal, liquidity and current income, by investing in U.S. government securities. Among other things, SSGA Funds Management, Inc. (“SSGA FM” or the “Adviser”), the investment adviser to the Fund, conducts its own credit analyses of potential investments and portfolio holdings, and relies substantially on a dedicated short-term credit research team. The Fund invests in accordance with regulatory requirements applicable to money market funds. Regulations require, among other things, a money market fund to invest only in short-term, high quality debt obligations (generally, securities that have remaining maturities of 397 calendar days or less, with the exception of certain floating rate securities that may have final maturities longer than 397 days but use maturity shortening provisions to meet the 397 day requirement, and that the Fund believes present minimal credit risk), to maintain a maximum dollar-weighted average maturity and dollar-weighted average life of sixty (60) days or less and 120 days or less, respectively, and to meet requirements as to portfolio diversification and liquidity. All securities held by the Fund are U.S. dollar-denominated, and they may have fixed, variable or floating interest rates.

The Fund attempts to meet its investment objective by investing in:

•

Obligations issued or guaranteed as to principal and/or interest, as applicable, by the U.S. government or its agencies and instrumentalities, such as U.S. Treasury securities and securities issued by the Government National Mortgage Association (“GNMA”), which are backed by the full faith and credit of the United States;

•

Obligations issued or guaranteed by the Federal Home Loan Mortgage Corporation, the Federal National Mortgage Association, and U.S. government-sponsored entities such as the Federal Home Loan Bank, and the Federal Farm Credit Banks Funding Corporation, which are not backed by the full faith and credit of the United States; and

•

Repurchase agreements collateralized by U.S. government securities.

The Fund seeks to achieve its investment objective by investing substantially all of its investable assets in the U.S. Government Portfolio, which has substantially identical investment policies to the Fund. When the Fund invests in this “master-feeder” structure, the Fund's only investments are shares of the Portfolio, and it participates in the investment returns achieved by the Portfolio. Descriptions in this section of the investment activities of the “Fund” also generally describe the expected investment activities of the Portfolio.

Principal Risks

The Fund is subject to the following risks. You could lose money by investing in the Fund. Although the Fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. An investment in the Fund is subject to investment risks, including possible loss of principal, is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation (“FDIC”) or any other government agency. The Fund's sponsor is not required to reimburse the Fund for losses, and you should not expect that the sponsor will provide financial support to the Fund at any time, including during periods of market stress. Certain risks relating to instruments and strategies used in the management of the Fund are placed first. The significance of any specific risk to an investment in the Fund will vary over time, depending on the composition of the Fund's portfolio, market conditions, and other factors. You should read all of the risk information presented below carefully, because any one or more of these risks may result in losses to the Fund.

Money Market Fund Risk: An investment in a money market fund is not a deposit of any bank and is not insured or guaranteed by the FDIC or any other government agency. Although a money market fund generally seeks to preserve the value of its shares at $1.00 per share, there can be no assurance that it will do so, and it is possible to lose money by investing in a money market fund. A major or unexpected change in interest rates or a decline in the credit quality of an issuer or entity providing credit support, an inactive trading market for money market instruments, or adverse market, economic, industry, political, regulatory, geopolitical, and other conditions could cause a money market fund's share price to fall below $1.00.

Repurchase Agreement Risk: Repurchase agreements may be viewed as loans made by the Fund which are collateralized by the securities subject to repurchase. If the Fund's counterparty should default on its obligations and the Fund is delayed or prevented from recovering the collateral, or if the value of the collateral is insufficient, the Fund may realize a loss.

Stable Share Price Risk: If the market value of one or more of the Fund's investments changes substantially, the Fund may not be able to maintain a stable share price of $1.00. This risk typically is higher during periods of rapidly changing interest rates or when issuer credit quality generally is falling, and is made worse when the Fund experiences significant redemption requests.

Low Short-Term Interest Rates: During market conditions in which short-term interest rates are at low levels, the Fund's yield can be very low. During these conditions, it is possible that the Fund will generate an insufficient amount of income to pay its expenses, and that it will not be able to pay a daily dividend and may have a negative yield (i.e., it may lose money on an operating basis). It is possible that the Fund would, during these conditions, maintain a substantial portion of its assets in cash, on which it may earn little, if any, income.

Counterparty Risk: The Fund will be subject to credit risk with respect to the counterparties with which the Fund enters into repurchase agreements and other transactions. If a counterparty fails to meet its contractual obligations, the Fund may be unable to terminate the transaction, and it may be delayed or prevented from realizing on any collateral in the event of a bankruptcy or insolvency proceeding relating to the counterparty.

Interest Rate Risk: Interest rate risk is the risk that debt securities will decline in value because of increases in interest rates. The value of a security with a longer duration will be more sensitive to changes in interest rates than a similar security with a shorter duration. Interest-only and principal-only securities are especially sensitive to interest rate changes, which can affect not only their prices but can also change the income flows and repayment assumptions about those investments.

Large Transactions Risk: To the extent a large proportion of the interests of the Portfolio or Fund are held by a small number of investors (or a single investor), including funds or accounts over which the Adviser has investment discretion, the Fund is subject to the risk that these investors will purchase or redeem Portfolio or Fund interests in large amounts rapidly or unexpectedly, including as a result of an asset allocation decision made by the Adviser. In addition, a large number of shareholders collectively may purchase or redeem Portfolio or Fund shares in large amounts rapidly or unexpectedly (collectively, such transactions are referred to as “large shareholder transactions”). Large shareholder transactions could adversely affect the ability of the Portfolio or Fund to conduct its investment program.

Rapid Changes in Interest Rates Risk: Rapid changes in interest rates may cause significant requests to redeem Fund Shares, and possibly cause the Fund to sell portfolio securities at a loss to satisfy those requests.

Significant Exposure to U.S. Government Agencies or Instrumentalities Risk: To the extent the Fund focuses its investments in securities issued or guaranteed by U.S. government agencies or instrumentalities, any market movements, regulatory changes or changes in political or economic conditions that affect the U.S. government agencies or instrumentalities in which the Fund invests may have a significant impact on the Fund's performance. Events that would adversely affect the market prices of securities issued or guaranteed by one government agency or instrumentality may adversely affect the market price of securities issued or guaranteed by other government agencies or instrumentalities.

U.S. Treasury Obligations Risk: U.S. Treasury obligations may differ from other fixed income securities in their interest rates, maturities, times of issuance and other characteristics. Similar to other issuers, changes to the financial condition or credit rating of the U.S. government may cause the value of the Fund's U.S. Treasury obligations to decline.

Variable and Floating Rate Securities Risk: During periods of increasing interest rates, changes in the coupon rates of variable or floating rate securities may lag behind the changes in market rates or may have limits on the maximum increases in coupon rates. Alternatively, during periods of declining interest rates, the coupon rates on such securities will typically readjust downward resulting in a lower yield.

Focused Investment Risk: To the extent the Fund invests a large percentage of its assets in securities within the same country, state, region, or economic sector its investment strategy could result in more risk or greater volatility in returns than if the Fund's investments were less focused.

Performance

The bar chart and table below provide some indication of the risks of investing in the ILR Government Fund by illustrating the variability of the Fund's returns for Premier Class shares from year-to-year. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (877) 521-4083 or by visiting our website at www.ssga.com. Effective March 10, 2025, the ILR Government Fund converted to a government money market fund and adopted its current investment strategy. Prior to March 10, 2025, the ILR Government Fund operated as an institutional prime money market fund and invested in certain types of securities that the ILR Government Fund is no longer permitted to hold. Consequently, performance information for periods prior to March 10, 2025 would have been different had the ILR Government Fund's current investment strategy been in effect.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	1.41%	Q4 2023
Lowest Quarterly Return	0.00%	Q4 2021

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Ten Years	Since Inception	Inception Date
Premier Class	5.32 %	2.57 %	1.87 %
Investment Class	4.94 %	2.31 %	1.59 %
Institutional Class	5.29 %	2.54 %	-	2.47 %	7/3/2018
Opportunity Class	5.30 %	-	-	3.84 %	10/27/2021
Administration Class	5.06 %	2.37 %	-	1.98 %	8/29/2016
Investor Class	5.24 %	2.50 %	-	2.30 %	7/13/2017

To obtain the Fund's current yield, please call (877) 521-4083.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Institutional Class
To establish an account	$25,000,000
To add to an existing account	None
Administration Class
To establish an account	$1,000
To add to an existing account	None
Investment Class
To establish an account	$250
To add to an existing account	None
Investor Class
To establish an account	$10,000,000
To add to an existing account	None
Premier Class
To establish an account	$250,000,000
To add to an existing account	None
Opportunity Class
To establish an account	$25,000,000
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

You may purchase or redeem Fund Shares by written request or wire transfer. Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Telephone:

For wire transfer instructions, please call (866) 392-0869 between 8:00 a.m. and 6:00 p.m. Eastern time. Redemptions by telephone are permitted only if you previously have been authorized for these transactions.

By Intermediary:

Financial Intermediaries may contact SS&C GIDS, Inc. at (877) 332-6207 or via email at nsccresearch@dstsystems.com with questions.

Tax Information

The Fund's distributions are expected to be taxed as ordinary income unless you are investing through a tax-advantaged arrangement, such as a 401(k) plan or individual retirement account. Any withdrawals made from such tax-advantaged arrangement may be taxable to you.

Payments to Broker-Dealers and Other Financial Intermediaries

State Street Institutional Treasury Money Market Fund

Investment Objective

The investment objective of State Street Institutional Treasury Money Market Fund (the “Treasury Fund” or sometimes referred to in context as the “Fund”) is to seek a high level of current income consistent with preserving principal and liquidity and the maintenance of a stable $1.00 per share net asset value (“NAV”).

Fees and Expenses of the Fund

The tables below describe the fees and expenses that you may pay if you buy, hold, and sell shares of the Treasury Fund (“Fund Shares”). You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. The expenses shown in the table and the Example reflect the expenses of the Fund and the Fund's proportionate share of the expenses of the State Street Treasury Money Market Portfolio (the “Treasury Portfolio” or sometimes referred to in context as the “Portfolio”).

Shareholder Fees (fees paid directly from your investment)

	Institutional	Administration	Investment	Investor	Premier	Opportunity
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None	None	None	None	None	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None	None	None	None	None	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

	Institutional	Administration	Investment	Investor	Premier	Opportunity
Management Fee	0.05%	0.05%	0.05%	0.05%	0.05%	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%	0.05%	0.10%	0.00%	0.00%	0.00%
Other Expenses	0.09%	0.26%	0.31%	0.14%	0.06%	0.09%
Total Annual Fund Operating Expenses	0.14%	0.36%	0.46%	0.19%	0.11%	0.14%

Example:

	1 year	3 years	5 years	10 years
Institutional	$14	$45	$79	$179
Administration	$37	$116	$202	$456
Investment	$47	$148	$258	$579
Investor	$19	$61	$107	$243
Premier	$11	$35	$62	$141
Opportunity	$14	$45	$79	$179

Principal Investment Strategies

The Treasury Fund is a government money market fund and attempts to meet its investment objective by investing only in U.S. Treasury bills, notes and bonds (which are direct obligations of the U.S. government). The Fund may hold a portion of its assets in cash pending investment, to satisfy redemption requests or to meet the Fund's other cash management needs.

The Fund invests in accordance with regulatory requirements applicable to money market funds, which require, among other things, the Fund to invest only in short-term securities (generally, securities that have remaining maturities of 397 calendar days or less, with the exception of certain floating rate securities that may have final maturities longer than 397 days but use maturity shortening provisions to meet the 397 day requirement, and that the Fund believes present minimal credit risk), to maintain a maximum dollar-weighted average maturity and dollar-weighted average life of sixty (60) days or less and 120 days or less, respectively, and to meet requirements as to portfolio diversification and liquidity.

The Fund seeks to achieve its investment objective by investing substantially all of its investable assets in the Treasury Portfolio, which has substantially identical investment policies to the Fund. When the Fund invests in this “master-feeder” structure, the Fund's only investments are shares of the Portfolio, and it participates in the investment returns achieved by the Portfolio. Descriptions in this section of the investment activities of the “Fund” also generally describe the expected investment activities of the Portfolio.

Principal Risks

Performance

The bar chart and table below provide some indication of the risks of investing in the Treasury Fund by illustrating the variability of the Fund's returns for Premier Class shares from year-to-year. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (877) 521-4083 or by visiting our website at www.ssga.com.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	1.34%	Q4 2023
Lowest Quarterly Return	0.00%	Q1 2015

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Ten Years	Since Inception	Inception Date
Premier Class	5.21 %	2.39 %	1.67 %
Institutional Class	5.18 %	2.37 %	-	2.30 %	7/30/2018
Administration Class	4.95 %	2.22 %	-	2.14 %	7/30/2018
Opportunity Class	5.18 %	-	-	3.63 %	10/27/2021
Investment Class	4.84 %	2.16 %	1.43 %
Investor Class	5.12 %	2.33 %	-	2.00 %	12/22/2016

To obtain the Fund's current yield, please call (877) 521-4083.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Institutional Class
To establish an account	$25,000,000
To add to an existing account	None
Administration Class
To establish an account	$1,000
To add to an existing account	None
Investment Class
To establish an account	$250
To add to an existing account	None
Investor Class
To establish an account	$10,000,000
To add to an existing account	None
Premier Class
To establish an account	$250,000,000
To add to an existing account	None
Opportunity Class
To establish an account	$25,000,000
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

You may purchase or redeem Fund Shares by written request or wire transfer. Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Telephone:

By Intermediary:

Financial Intermediaries may contact SS&C GIDS, Inc. at (877) 332-6207 or via email at nsccresearch@dstsystems.com with questions.

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

State Street Institutional Treasury Plus Money Market Fund

Investment Objective

The investment objective of State Street Institutional Treasury Plus Money Market Fund (the “Treasury Plus Fund” or sometimes referred to in context as the “Fund”) is to seek a high level of current income consistent with preserving principal and liquidity and the maintenance of a stable $1.00 per share net asset value (“NAV”).

Fees and Expenses of the Fund

The tables below describe the fees and expenses that you may pay if you buy, hold, and sell shares of the Treasury Plus Fund (“Fund Shares”). You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. The expenses shown in the table and the Example reflect the expenses of the Fund and the Fund's proportionate share of the expenses of the State Street Treasury Plus Money Market Portfolio (the “Treasury Plus Portfolio” or sometimes referred to in context as the “Portfolio”).

Shareholder Fees (fees paid directly from your investment)

	Institutional	Administration	Investment	Investor	Premier	Opportunity
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None	None	None	None	None	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None	None	None	None	None	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

	Institutional	Administration	Investment	Investor	Premier	Opportunity
Management Fee	0.05%	0.05%	0.05%	0.05%	0.05%	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%	0.05%	0.10%	0.00%	0.00%	0.00%
Other Expenses	0.09%	0.26%	0.31%	0.14%	0.06%	0.09%
Total Annual Fund Operating Expenses	0.14%	0.36%	0.46%	0.19%	0.11%	0.14%

Example:

	1 year	3 years	5 years	10 years
Institutional	$14	$45	$79	$179
Administration	$37	$116	$202	$456
Investment	$47	$148	$258	$579
Investor	$19	$61	$107	$243
Premier	$11	$35	$62	$141
Opportunity	$14	$45	$79	$179

Principal Investment Strategies

The Treasury Plus Fund is a government money market fund and attempts to meet its investment objective by investing only in U.S. Treasury bills, notes and bonds (which are direct obligations of the U.S. government) and repurchase agreements collateralized by these obligations. The Fund may hold a portion of its assets in cash pending investment, to satisfy redemption requests or to meet the Fund's other cash management needs.

The Fund seeks to achieve its investment objective by investing substantially all of its investable assets in the Treasury Plus Portfolio, which has substantially identical investment policies to the Fund. When the Fund invests in this “master-feeder” structure, the Fund's only investments are shares of the Portfolio, and it participates in the investment returns achieved by the Portfolio. Descriptions in this section of the investment activities of the “Fund” also generally describe the expected investment activities of the Portfolio.

Principal Risks

Performance

The bar chart and table below provide some indication of the risks of investing in the Treasury Plus Fund by illustrating the variability of the Fund's returns for Premier Class shares from year-to-year. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (877) 521-4083 or by visiting our website at www.ssga.com.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	1.34%	Q4 2023
Lowest Quarterly Return	0.00%	Q1 2015

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Ten Years	Since Inception	Inception Date
Premier Class	5.23 %	2.44 %	1.70 %
Investment Class	4.86 %	2.21 %	1.46 %
Institutional Class	5.20 %	2.42 %	-	2.34 %	7/30/2018
Opportunity Class	5.20 %	2.42 %	1.69 %
Administration Class	4.96 %	2.27 %	-	2.17 %	7/30/2018
Investor Class	5.14 %	2.38 %	-	1.98 %	10/14/2016

To obtain the Fund's current yield, please call (877) 521-4083.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Institutional Class
To establish an account	$25,000,000
To add to an existing account	None
Administration Class
To establish an account	$1,000
To add to an existing account	None
Investment Class
To establish an account	$250
To add to an existing account	None
Investor Class
To establish an account	$10,000,000
To add to an existing account	None
Premier Class
To establish an account	$250,000,000
To add to an existing account	None
Opportunity Class
To establish an account	$25,000,000
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

You may purchase or redeem Fund Shares by written request or wire transfer. Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Telephone:

By Intermediary:

Financial Intermediaries may contact SS&C GIDS, Inc. at (877) 332-6207 or via email at nsccresearch@dstsystems.com with questions.

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

State Street Institutional U.S. Government Money Market Fund

Investment Objective

The investment objective of the State Street Institutional U.S. Government Money Market Fund (the “U.S. Government Fund” or sometimes referred to in context as the “Fund”) is to seek to maximize current income, to the extent consistent with the preservation of capital and liquidity and the maintenance of a stable $1.00 per share net asset value (“NAV”).

Fees and Expenses of the Fund

The tables below describe the fees and expenses that you may pay if you buy, hold, and sell shares of the U.S. Government Fund (“Fund Shares”). You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. The expenses shown in the table and the Example reflect the expenses of the Fund and the Fund's proportionate share of the expenses of the State Street U.S. Government Money Market Portfolio (the “U.S. Government Portfolio” or sometimes referred to in context as the “Portfolio”).

Shareholder Fees (fees paid directly from your investment)

	Institutional	Administration	Investment	Investor	Premier	Opportunity
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None	None	None	None	None	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None	None	None	None	None	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

	Institutional	Administration	Investment	Investor	Premier	Opportunity
Management Fee	0.05%	0.05%	0.05%	0.05%	0.05%	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%	0.05%	0.10%	0.00%	0.00%	0.00%
Other Expenses1	0.09%	0.26%	0.31%	0.14%	0.06%	0.09%
Total Annual Fund Operating Expenses1	0.14%	0.36%	0.46%	0.19%	0.11%	0.14%

“Other Expenses” and “Total Annual Fund Operating Expenses” for the Institutional Class shares have been restated to reflect current fees.

Example:

	1 year	3 years	5 years	10 years
Institutional	$14	$45	$79	$179
Administration	$37	$116	$202	$456
Investment	$47	$148	$258	$579
Investor	$19	$61	$107	$243
Premier	$11	$35	$62	$141
Opportunity	$14	$45	$79	$179

Principal Investment Strategies

The U.S. Government Fund is a government money market fund and invests only in obligations issued or guaranteed as to principal and/or interest, as applicable, by the U.S. government or its agencies and instrumentalities, as well as repurchase agreements secured by such instruments. The Fund may hold a portion of its assets in cash pending investment, to satisfy redemption requests or to meet the Fund's other cash management needs.

The Fund attempts to meet its investment objective by investing in:

•

Repurchase agreements collateralized by U.S. government securities.

Principal Risks

Performance

The bar chart and table below provide some indication of the risks of investing in the U.S. Government Fund by illustrating the variability of the Fund's returns for Premier Class shares from year-to-year. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (877) 521-4083 or by visiting our website at www.ssga.com.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	1.34%	Q4 2023
Lowest Quarterly Return	0.00%	Q1 2015

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Ten Years	Since Inception	Inception Date
Premier Class	5.23 %	2.44 %	1.71 %
Investment Class	4.87 %	2.21 %	1.46 %
Institutional Class	5.21 %	2.42 %	-	2.27 %	1/18/2018
Administration Class	4.97 %	2.26 %	-	1.82 %	8/23/2016
Opportunity Class	5.20 %	-	-	3.70 %	10/27/2021
Investor Class	5.15 %	2.37 %	-	1.87 %	3/21/2016

To obtain the Fund's current yield, please call (877) 521-4083.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Institutional Class
To establish an account	$25,000,000
To add to an existing account	None
Administration Class
To establish an account	$1,000
To add to an existing account	None
Investment Class
To establish an account	$250
To add to an existing account	None
Investor Class
To establish an account	$10,000,000
To add to an existing account	None
Premier Class
To establish an account	$250,000,000
To add to an existing account	None
Opportunity Class
To establish an account	$25,000,000
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

You may purchase or redeem Fund Shares by written request or wire transfer. Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Telephone:

By Intermediary:

Financial Intermediaries may contact SS&C GIDS, Inc. at (877) 332-6207 or via email at nsccresearch@dstsystems.com with questions.

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

Additional Information About Investment Objectives, Principal Strategies and Risks

Investment Objective

The investment objective of each of the ILR Government Fund, U.S. Government Fund, the Treasury Fund and the Treasury Plus Fund, as stated in each Fund's Summary, may be changed without shareholder approval.

ILR Government Fund

Principal Investment Strategies

The Fund attempts to meet its investment objective by investing in:

•

Repurchase agreements collateralized by U.S. government securities.

Treasury Fund

Principal Investment Strategies

The Treasury Fund is a government money market fund and attempts to meet its investment objective by investing only in U.S. Treasury bills, notes and bonds (which are direct obligations of the U.S. government). The Fund will provide shareholders with at least sixty (60) days' prior notice of any change in this investment policy. The Fund may hold a portion of its assets in cash pending investment, to satisfy redemption requests or to meet the Fund's other cash management needs.

Treasury Plus Fund

Principal Investment Strategies

The Treasury Plus Fund is a government money market fund and attempts to meet its investment objective by investing only in U.S. Treasury bills, notes and bonds (which are direct obligations of the U.S. government) and repurchase agreements collateralized by these obligations. The Fund will provide shareholders with at least sixty (60) days' prior notice of any change in this investment policy. The Fund may hold a portion of its assets in cash pending investment, to satisfy redemption requests or to meet the Fund's other cash management needs.

U.S. Government Fund

Principal Investment Strategies

The U.S. Government Fund is a government money market fund and invests only in obligations issued or guaranteed as to principal and/or interest, as applicable, by the U.S. government or its agencies and instrumentalities, as well as repurchase agreements secured by such instruments. The Fund will provide shareholders with at least sixty (60) days' prior notice of any change in this investment policy. The Fund may hold a portion of its assets in cash pending investment, to satisfy redemption requests or to meet the Fund's other cash management needs.

The Fund follows a disciplined investment process that attempts to provide stability of principal, liquidity and current income, by investing in U.S. government securities. Among other things, SSGA FM conducts its own credit analyses of potential investments and portfolio holdings, and relies substantially on a dedicated short-term credit research team. The Fund invests in accordance with regulatory requirements applicable to money market funds. Regulations require, among other things, a money market fund to invest only in short-term, high quality debt obligations (generally, securities that have remaining maturities of 397 calendar days or less, with the exception of certain floating rate securities that may have final maturities longer than 397 days but use maturity shortening provisions to meet the 397 day requirement, and that the Fund believes present minimal credit risk), to maintain a maximum dollar-weighted average maturity and dollar-weighted average life of sixty (60) days or less and 120 days or less, respectively, and to meet requirements as to portfolio diversification and liquidity. All securities held by the Fund are U.S. dollar-denominated, and they may have fixed, variable or floating interest rates.

The Fund attempts to meet its investment objective by investing in:

•

Repurchase agreements collateralized by U.S. government securities.

Additional Information About Risks

Counterparty Risk (principal risk for the ILR Government Fund, U.S. Government Fund and Treasury Plus Fund). A Fund will be subject to credit risk with respect to the counterparties with which a Fund enters into repurchase agreements and other transactions. If a counterparty fails to meet its contractual obligations, a Fund may be unable to terminate the transaction, and it may be delayed or prevented from realizing on any collateral in the event of a bankruptcy or insolvency proceeding relating to the counterparty.

Credit Risk (principal risk for the ILR Government Fund, U.S. Government Fund and Treasury Plus Fund). Credit risk is the risk that an issuer, guarantor or liquidity provider of a fixed-income security held by a Fund may be unable or unwilling, or may be perceived (whether by market participants, ratings agencies, pricing services or otherwise) as unable or unwilling, to make timely principal and/or interest payments, or to otherwise honor its obligations. It includes the risk that the security will be downgraded by a credit rating agency; generally, lower credit quality issuers present higher credit risks. An actual or perceived decline in creditworthiness of an issuer of a fixed-income security held by a Fund may result in a decrease in the value of the security. It is possible that the ability of an issuer to meet its obligations will decline substantially during the period when a Fund owns securities of the issuer or that the issuer will default on its obligations or that the obligations of the issuer will be limited or restructured.

Debt Securities Risk. The values of debt securities may increase or decrease as a result of the following: market fluctuations, changes in interest rates, actual or perceived inability or unwillingness of issuers, guarantors or liquidity providers to make scheduled principal or interest payments or illiquidity in debt securities markets. To the extent that interest rates rise, certain underlying obligations may be paid off substantially slower than originally anticipated and the value of those securities may fall sharply. A rising interest rate environment may cause the value of a Fund's fixed income securities to decrease, an adverse impact on the liquidity of a Fund's fixed income securities, and increased volatility of the fixed income markets. During periods when interest rates are at low levels, a Fund's yield can be low, and a Fund may have a negative yield (i.e., it may lose money on an operating basis). To the extent that interest rates fall, certain underlying obligations may be paid off substantially faster than originally anticipated. If the principal on a debt obligation is prepaid before expected, the prepayments of principal may have to be reinvested in obligations paying interest at lower rates. During periods of falling interest rates, the income received by a Fund may decline. Changes in interest rates will

likely have a greater effect on the values of debt securities of longer durations. Returns on investments in debt securities could trail the returns on other investment options, including investments in equity securities. High levels of inflation and/or a significantly changing interest rate environment can lead to heightened levels of volatility and reduced liquidity.

Focused Investment Risk. To the extent the Fund invests a large percentage of its assets in securities within the same country, state, region, or economic sector its investment strategy could result in more risk or greater volatility in returns than if the Fund's investments were less focused. Similarly, to the extent the Fund holds investments with closely correlated market prices, it will be subject to greater risk than a fund with investments that are not as closely correlated. Changes in the value of a single security or issuer or the impact of a single economic, political, or regulatory occurrence may have a greater adverse impact on the Fund's net asset value.

A fund that invests in the securities of a small number of issuers has greater exposure to adverse developments affecting those issuers and a resulting decline in the market price of those issuers' securities as compared to a fund that invests in the securities of a larger number of issuers. Companies that share common characteristics are often subject to similar business risks and regulatory burdens and often react similarly to specific economic, market, political or other developments.

Similarly, funds having a significant portion of their assets in investments tied economically to a particular geographic region, country, or market (e.g., emerging markets) or to sectors within a region, country, or market have more exposure to regional and country economic risks than do funds whose investments are more geographically diverse.

Income Risk (principal risk for the ILR Government Fund and the U.S. Government Fund). A Fund's income may decline due to falling interest rates or other factors. Issuers of securities held by a Fund may call or redeem the securities during periods of falling interest rates, and the Fund would likely be required to reinvest in securities paying lower interest rates. If an obligation held by a Fund is prepaid, the Fund may have to reinvest the prepayment in other obligations paying income at lower rates. A reduction in the income earned by a Fund may limit the Fund's ability to achieve its objective.

Interest Rate Risk. Interest rate risk is the risk that the securities held by a Fund will decline in value because of increases in market interest rates. Duration is a measure used to determine the sensitivity of a security's price to changes in interest rates. Debt securities with longer durations tend to be more sensitive to changes in interest rates, usually making them more volatile than debt securities with shorter durations. For example, the value of a security with a duration of five years would be expected to decrease by 5% for every 1% increase in interest rates. Falling interest rates also create the potential for a decline in a Fund's income and yield. Interest-only and principal-only securities are especially sensitive to interest rate changes, which can affect not only their prices but can also change the income flows and repayment assumptions about those investments. Variable and floating rate securities also generally increase or decrease in value in response to changes in interest rates, although generally to a lesser degree than fixed-rate securities. A substantial increase in interest rates may also have an adverse impact on the liquidity of a security, especially those with longer durations. Changes in governmental policy, including changes in central bank monetary policy, could cause interest rates to rise rapidly, or cause investors to expect a rapid rise in interest rates. This could lead to heightened levels of interest rate, volatility and liquidity risks for the fixed income markets generally and could have a substantial and immediate effect on the values of a Fund's investments. High levels of inflation and/or a significantly changing interest rate environment can lead to heightened levels of volatility and reduced liquidity.

more liquid portfolio investments to meet a large redemption, in which case a Fund's remaining assets may be less liquid, more volatile, and more difficult to price. A Portfolio or Fund may hold a relatively large proportion of its assets in cash in anticipation of large redemptions, diluting its investment returns. A number of circumstances may cause a Portfolio or a Fund to experience large redemptions, such as changes in investors' circumstances; changes in the eligibility criteria for a Portfolio or a Fund or share class of the Fund; liquidations, reorganizations, repositionings, or other announced Portfolio or Fund events; or changes in investment objectives, strategies, policies, risks, or investment personnel.

Low Short-Term Interest Rate Risk. During market conditions in which short-term interest rates are at low levels a Fund's yield can be very low. During these conditions, it is possible that a Fund will generate an insufficient amount of income to pay its expenses, and that it will not be able to pay a daily dividend and may have a negative yield (i.e., it may lose money on an operating basis). It is possible that a Fund would, during these conditions, maintain a substantial portion of its assets in cash, on which it may earn little, if any, income.

Market Disruption and Geopolitical Risk. A Fund is subject to the risk that geopolitical events will disrupt securities markets and adversely affect global economies and markets. War, terrorism, and related geopolitical events have led, and in the future may lead, to increased short-term market volatility and may have adverse long-term effects on U.S. and world economies and markets generally. Likewise, trade policy changes or disputes, natural and environmental disasters, pandemics and epidemics, and systemic market dislocations may be highly disruptive to economies and markets. Those events, as well as other changes in foreign and domestic economic and political conditions, also could adversely affect individual issuers or related groups of issuers, securities markets, interest rates, credit ratings, inflation, investor sentiment, and other factors affecting the value of a Fund's investments. Given the increasing interdependence among global economies and markets, conditions in one country, market, or region might adversely affect markets, issuers, and/or foreign exchange rates in other countries, including the U.S. Any partial or complete dissolution of the Economic and Monetary Union of the European Union, or any increased uncertainty as to its status, could have significant adverse effects on currency and financial markets, and on the values of a Fund's investments. On January 31, 2020, the United Kingdom (“UK”) formally withdrew from the European Union (“EU”) (commonly known as “Brexit”). An agreement between the UK and the EU governing their future trade relationship became effective January 1, 2021, but that agreement does not include an agreement on financial services, and it is unlikely that such agreement will be concluded. Moreover, the UK government has started a program of financial services law reform with the ultimate aim of repealing many EU financial services laws that were assimilated into UK law from January 1, 2021, and replacing them with legislation or rules made by the UK government or financial services regulators. Accordingly, uncertainty remains in certain areas as to the future relationship between the UK and the EU. Brexit has already had a significant impact on the UK, Europe, and global economies, and could continue to result in volatility and illiquidity, legal, political, economic and regulatory uncertainties and lower economic growth for these economies that could in turn have an adverse effect on the value of the Fund's investments. Any further exits from the EU, or the possibility of such exits, or the abandonment of the euro, may cause additional market disruption globally and introduce new legal and regulatory uncertainties.

Money Market Fund Regulatory Risk. Money market funds and the securities they invest in are subject to comprehensive regulations. The SEC has adopted amendments to money market fund regulation that, among other things, increase the daily and weekly liquid asset requirements (“Money Market Fund Reform”). Money Market Fund Reform permits government money market funds (such as the Funds), that are experiencing a negative gross yield as a result of negative interest rates, to either convert from a stable share price to a floating share price or reduce the number of shares outstanding to maintain a stable net asset value per share, subject to certain Board determinations and disclosures to investors. The SEC and other government agencies continue to review the regulation of money market funds and may implement additional regulatory changes in the future. The enactment of any new legislation or regulations impacting the money market fund industry could limit the Fund's investment flexibility and reduce its ability to generate returns.

Money Market Fund Risk. An investment in a money market fund is not a deposit of any bank and is not insured or guaranteed by the FDIC or any other government agency. Although a money market fund generally seeks to preserve the value of its shares at $1.00 per share, there can be no assurance that it will do so, and it is possible to lose money by investing in a money market fund. A major or unexpected change in interest rates or a decline in the credit quality of an issuer or entity providing credit support, an inactive trading market for money market instruments, or adverse market, economic, industry, political, regulatory, geopolitical, and other conditions could cause a money market fund's share price to fall below $1.00. It is possible that a money market fund will issue and redeem shares at $1.00 per share at times when the fair value of the money market fund's portfolio per share is more or less than $1.00. Rule 2a-7 as adopted by the SEC permits a money market fund to impose a liquidity fee upon the sale of fund shares under certain circumstances, however the Funds are all government money market funds that have not elected to be subject to the liquidity fee provision of Rule 2a-7. None of State Street Corporation, State Street, State Street Global Advisors, SSGA FM or their affiliates (collectively, the “State Street Entities”) guarantee the value of an investment in a money market fund at $1.00 per share. Investors should have no expectation of capital support to a money market fund from the State Street Entities.

Mortgage-Related and Other Asset-Backed Securities Risk (principal risk for the ILR Government Fund and the U.S. Government Fund). Investments in mortgage-related and other asset-backed securities are subject to the risk of significant credit downgrades, illiquidity, and defaults to a greater extent than many other types of fixed income investments. The liquidity of mortgage-related and asset-backed securities may change over time. Mortgage-related securities represent a participation in, or are secured by, mortgage loans. Other asset-backed securities are typically structured like mortgage-related securities, but instead of mortgage loans or interests in mortgage loans, the underlying assets may include, for example, items such as motor vehicle installment sales or installment loan contracts, leases on various types of real and personal property, and receivables from credit card agreements. During periods of falling interest rates, mortgage-related and other asset-backed securities, which typically provide the issuer with the right to prepay the security prior to maturity, may be prepaid, which may result in a Fund having to reinvest the proceeds in other investments at lower interest rates. During periods of rising interest rates, the average life of mortgage-related and other asset-backed securities may extend because of slower-than expected principal payments. This may lock in a below market interest rate, increase the security's duration and interest rate sensitivity, and reduce the value of the security. As a result, mortgage-related and other asset-backed securities may have less potential for capital appreciation during periods of declining interest rates than other debt securities of comparable maturities, although they may have a similar risk of decline in market values during periods of rising interest rates. Prepayment rates are difficult to predict and the potential impact of prepayments on the value of a mortgage-related or other asset-backed security depends on the terms of the instrument and can result in significant volatility. The price of a mortgage-related or other asset-backed security also depends on the credit quality and adequacy of the underlying assets or collateral. Mortgage-related or other asset-backed securities issued by non-governmental issuers (such as commercial banks, savings and loan institutions, private mortgage insurance companies, mortgage bankers and other secondary market issuers) will generally entail greater credit risk than obligations guaranteed by the U.S. government. Defaults on the underlying assets, if any, may impair the value of a mortgage-related or other asset-backed security. For some asset-backed securities in which a Fund invests, such as those backed by credit card receivables, the underlying cash flows may not be supported by a security interest in a related asset. Moreover, the values of mortgage-related and other asset-backed securities may be substantially dependent on the servicing of the underlying asset pools, and are therefore subject to risks associated with the negligence or malfeasance by their servicers and to the credit risk of their servicers. In certain situations, the mishandling of related documentation may also affect the rights of securities holders in and to the underlying collateral. There may be legal and practical limitations on the enforceability of any security interest granted with respect to underlying assets, or the value of the underlying assets, if any, may be insufficient if the issuer defaults.

Rapid Changes in Interest Rates. The values of instruments held by a Fund may be adversely affected by rapid changes in interest rates. Rapid changes in interest rates may cause significant requests to redeem Fund Shares, and possibly cause a Fund to sell portfolio securities at a loss to satisfy those requests. Significant losses could impair a Fund's ability to maintain a stable share price of $1.00.

Reinvestment Risk (principal risk for the ILR Government Fund and U.S. Government Fund). Income from a Fund's portfolio may decline when the Fund invests the proceeds from investment income, sales of portfolio securities or matured, traded or called debt obligations. For instance, during periods of declining interest rates, an issuer of debt obligations may exercise an option to redeem securities prior to maturity, forcing a Fund to reinvest the proceeds in lower-yielding securities. A decline in income received by a Fund from its investments is likely to have a negative effect on the yield and total return of the Fund Shares.

Repurchase Agreement Risk (principal risk for the ILR Government Fund, U.S. Government Fund and Treasury Plus Fund). A repurchase agreement is an agreement to buy a security from a seller at one price and a simultaneous agreement to sell it back to the original seller at an agreed-upon price, typically representing the purchase price plus interest. Repurchase agreements may be viewed as loans made by a Fund which are collateralized by the securities subject to repurchase. A Fund's investment return on such transactions will depend on the counterparty's willingness and ability to perform its obligations under a repurchase agreement. If a Fund's counterparty should default on its obligations and a Fund is delayed or prevented from recovering the collateral, or if the value of the collateral is insufficient, a Fund may realize a loss.

nificant impact on a Fund's performance. Events that would adversely affect the market prices of securities issued or guaranteed by one government agency or instrumentality may adversely affect the market price of securities issued or guaranteed by other government agencies or instrumentalities.

Stable Share Price Risk. If the market value of one or more of the Fund's investments changes substantially, the Fund may not be able to maintain a stable share price of $1.00. This risk typically is higher during periods of rapidly changing interest rates or when issuer credit quality generally is falling, and is made worse when the Fund experiences significant redemption requests.

U.S. Government Securities Risk (principal risk for the ILR Government Fund and U.S. Government Fund). U.S. government securities, such as Treasury bills, notes and bonds and mortgage-backed securities guaranteed by the Government National Mortgage Association (“Ginnie Mae”), are supported by the full faith and credit of the United States; others are supported by the right of the issuer to borrow from the U.S. Treasury; others are supported by the discretionary authority of the U.S. government to purchase the agency's obligations; and still others are supported only by the credit of the issuing agency, instrumentality, or enterprise. Although U.S. government-sponsored enterprises such as the Federal Home Loan Mortgage Corporation (“Freddie Mac”) and the Federal National Mortgage Association (“Fannie Mae”) may be chartered or sponsored by Congress, they are not funded by Congressional appropriations, and their securities are not issued by the U.S. Treasury nor supported by the full faith and credit of the U.S. government. There is no assurance that the U.S. government would provide financial support to its agencies and instrumentalities if not required to do so. In addition, certain governmental entities have been subject to regulatory scrutiny regarding their accounting policies and practices and other concerns that may result in legislation, changes in regulatory oversight and/or other consequences that could adversely affect the credit quality, availability, or investment character of securities issued by these entities. The value and liquidity of U.S. government securities may be affected adversely by changes in the ratings of those securities. Securities issued by the U.S. Treasury historically have been considered to present minimal credit risk. The downgrade in the long-term U.S. credit rating by at least two major rating agencies has introduced greater uncertainty about the ability of the U.S. to repay its obligations. Further credit rating downgrades or a U.S. credit default could decrease the value and increase the volatility of a Fund's investments.

U.S. Treasury Obligations Risk. U.S. Treasury obligations may differ from other securities in their interest rates, maturities, times of issuance and other characteristics. Similar to other issuers, changes to the financial condition or credit rating of the U.S. government may cause the value of a Fund's U.S. Treasury obligations to decline. The total public debt of the United States as a percentage of gross domestic product grew rapidly after the financial crisis of 2008 and has remained at a historically high level. Although high debt levels do not necessarily indicate or cause economic problems, they may create certain systemic risks if sound debt management practices are not implemented. A high national debt level may increase market pressures to meet government funding needs, which may drive debt cost higher and cause a country to sell additional debt, thereby increasing refinancing risk. A high national debt also raises concerns that a government will not be able to make principal or interest payments when they are due. In the worst case, unsustainable debt levels can cause a decline in the value of the dollar (which may lead to inflation), and can prevent the U.S. government from implementing effective countercyclical fiscal policy in economic downturns. On August 5, 2011, Standard & Poor's Ratings Services downgraded U.S. Treasury securities from AAA rating to AA+ rating. Standard & Poor's Ratings Services stated that its decision was prompted by its view on the rising public debt burden and its perception of greater policymaking uncertainty. Fitch also downgraded its rating of U.S. Treasury securities from AAA to AA+ in August 2023 citing increasing government debt and erosion in confidence regarding governance of fiscal matters as a result of repeated political standoffs related to debt limit approvals. A downgrade of the ratings of U.S. government debt obligations, which are often used as a benchmark for other borrowing arrangements, could result in higher interest rates for individual and corporate borrowers, cause disruptions in the international bond markets and have a substantial negative effect on the U.S. economy. Any additional downgrades of U.S. Treasury securities from ratings agencies may cause the value of a Fund's U.S. Treasury obligations to decline. In recent years, impasses in Congress regarding the federal budget have caused temporary Federal government shutdowns. While Congress has temporarily suspended the debt limit from time to time, the risks that the U.S. government will not adopt a long-term budget or deficit reduction plan, of one or more additional Federal government shutdowns or of future failures to not increase the Federal government's debt limit, may affect investor and consumer confidence and may adversely impact financial markets and the broader economy, perhaps suddenly and to a significant degree.

accordance with the terms of the securities) in increases in interest rates through upward adjustments of the coupon rates on the securities. However, during periods of increasing interest rates, changes in the coupon rates may lag behind the changes in market rates or may have limits on the maximum increases in coupon rates. Alternatively, during periods of declining interest rates, the coupon rates on such securities will typically readjust downward resulting in a lower yield. A Fund may also invest in variable or floating rate equity securities, whose dividend payments vary based on changes in market rates of interest or other factors.

Additional Information About Non-Principal Investment Strategies and Risks

The investments described below reflect the Funds' and the Portfolios' current practices. In addition to the principal risks described above, other risks are described in some of the descriptions of the investments below:

has established business continuity plans and systems designed to minimize the risk of cyber-attacks through the use of technology, processes and controls, there are inherent limitations in such plans and systems, including the possibility that certain risks have not been identified, given the evolving nature of this threat. The use of artificial intelligence (“AI”) and machine learning could exacerbate these risks or result in cyber security incidents that implicate personal data. Each Fund relies on third-party service providers for many of its day-to-day operations, and will be subject to the risk that the protections and protocols implemented by those service providers will be ineffective to protect the Fund from cyber-attack. The Adviser does not control the cybersecurity plans and systems put in place by third-party service providers, and such third-party service providers may have limited indemnification obligations to the Adviser or the Funds. Similar types of cybersecurity risks or technical malfunctions also are present for issuers of securities in which each Fund invests, which could result in material adverse consequences for such issuers, and may cause a Fund's investment in such securities to lose value.

Risk of Investment in Other Pools. If a Fund invests in another pooled investment vehicle, it is exposed to the risk that the other pool will not perform as expected. A Fund is exposed indirectly to all of the risks applicable to an investment in such other pool. In addition, lack of liquidity in the underlying pool could result in its value being more volatile than the underlying portfolio of securities, and may limit the ability of a Fund to sell or redeem its interest in the pool at a time or at a price it might consider desirable. The investment policies and limitations of the other pool may not be the same as those of the Fund; as a result, the Fund may be subject to additional or different risks, or may achieve a reduced investment return, as a result of its investment in another pool. If a pool is an exchange-traded fund or other product traded on a securities exchange or otherwise actively traded, its shares may trade at a premium or discount to their NAV, an effect that might be more pronounced in less liquid markets. A Fund bears its proportionate share of the fees and expenses of any pool in which it invests. The Adviser or an affiliate may serve as investment adviser to a pool in which the Fund may invest, leading to potential conflicts of interest. For example, the Adviser or its affiliates may receive fees based on the amount of assets invested in the pool. Investment by a Fund in the pool may be beneficial to the Adviser or an affiliate in the management of the pool, by helping to achieve economies of scale or enhancing cash flows. Due to this and other factors, the Adviser may have an incentive to invest a Fund's assets in a pool sponsored or managed by the Adviser or its affiliates in lieu of investments by the Fund directly in portfolio securities, or may have an incentive to invest in the pool over a pool sponsored or managed by others. Similarly, the Adviser may have an incentive to delay or decide against the sale of interests held by a Fund in a pool sponsored or managed by the Adviser or its affiliates. It is possible that other clients of the Adviser or its affiliates will purchase or sell interests in a pool sponsored or managed by the Adviser or its affiliates at prices and at times more favorable than those at which a Fund does so.

Temporary Defensive Positions. In response to actual or perceived adverse market, economic, political, or other conditions, a Fund may (but will not necessarily), without notice, depart from its principal investment strategies by temporarily investing for defensive purposes. While investing defensively, the Fund may maintain a substantial portion of its assets in cash, on which the Fund may earn little if any income. If a Fund invests for defensive purposes, it may not achieve its investment objective. In addition, the defensive strategy may not work as intended.

Portfolio Holdings Disclosure

The Funds' portfolio holdings disclosure policy is described in the Statement of Additional Information (“SAI”).

Management and Organization

A Fund can withdraw its investment in a Portfolio if, at any time, the Fund's Board of Trustees (the “Board” and each member thereof, a “Trustee”) determines that it would be in the best interests of the Fund's shareholders, or if the investment objectives of the corresponding Portfolio changed so that they were inconsistent with the objectives of the Fund. If a Fund withdraws its investment from a Portfolio, the Fund may invest all of its assets in another mutual fund that has the same investment objective as the Fund, the Adviser may directly manage the Fund's assets, or the Board may take such other action it deems appropriate and in the best interests of shareholders of the Fund, which may include liquidation of the Fund.

Investment Adviser

SSGA FM intends to support inclusion and diversity initiatives by making an annual donation out of its own assets in an amount equal to or more than 20% of the annual management fees received with respect to the assets invested in the Opportunity Class shares of each Fund. Donations will be made to charitable organizations working in congruence with State Street Corporation to address racism and inequality. Management fees are determined net of fee waivers, expense reimbursements, net asset value support payments and similar amounts. The donation program will continue throughout the life of the Opportunity Class shares. The charitable organizations will not participate in, or have any influence on the day-to-day operations of, the Funds or the Adviser's management of the Funds.

Each Fund has entered into an investment advisory agreement with the Adviser pursuant to which the Adviser will manage the Fund's assets directly, for compensation paid at an annual rate of 0.05% of the Fund's average daily net assets, in the event that the Fund were to cease investing substantially all of its assets in its corresponding Portfolio or another investment company with essentially the same investment objectives and policies as the Fund. The Adviser does not receive any management fees from a Fund under that agreement so long as the Fund continues to invest substantially all of its assets in the corresponding Portfolio or in another investment company with essentially the same investment objectives and policies as the Fund. The Adviser places all orders for purchases and sales of the Portfolios' investments. Prior to March 10, 2025, the ILR Government Fund invested substantially all of its investable assets in State Street Money Market Portfolio. For the year ended December 31, 2024, the effective management fee paid, reflecting certain fee waivers and expense reimbursements of the Adviser, was 0.05% for State Street Money Market Portfolio, 0.05% for Treasury Portfolio, 0.05% for Treasury Plus Portfolio and 0.05% for U.S. Government Portfolio.

tion, shareholder servicing, sub-transfer agency and administration fees) exceed 0.07% of average daily net assets on an annual basis (the “Total Annual Fund Operating Expense Waiver”). The Total Annual Fund Operating Expense Waiver may not be terminated prior to April 30, 2026 with respect to any Fund except with approval of the Fund's Board of Trustees.

In addition to any contractual expense limitation for a Fund which is described above, each of the Adviser and State Street Global Advisors Funds Distributors, LLC (each a “Service Provider”) also may voluntarily reduce all or a portion of its fees and/or reimburse expenses for a Fund or a share class to the extent necessary to maintain a certain minimum net yield, which may vary from time to time in SSGA FM's sole discretion (any such waiver or reimbursement of expenses being referred to herein as a “Voluntary Reduction”). The Adviser may, in its sole discretion, implement the Voluntary Reduction for some Funds, or some share classes of a Fund, and not others. The amount of any Voluntary Reduction may differ between Funds and share classes in the Adviser's sole discretion. The business objectives of the Adviser and its affiliates and their broader relationships with certain Fund shareholders, Financial Intermediaries or distribution channels could give the Adviser an incentive to implement the Voluntary Reduction for some Funds or share classes and not others, or to implement it to a greater degree for some Funds or share classes than others. Under an agreement with the Service Providers relating to the Voluntary Reduction, the Funds and the Portfolios have agreed to reimburse the Service Providers for the full dollar amount of any Voluntary Reduction beginning on May 1, 2020, subject to certain limitations. Each Service Provider may, in its sole discretion, irrevocably waive receipt of any or all reimbursement amounts due from a Fund.

A reimbursement to the Service Provider would increase fund expenses and may negatively impact a Fund's yield during such period. There is no guarantee that the Voluntary Reduction will be in effect at any given time or that a Fund will be able to avoid a negative yield. The Funds have agreed, subject to certain limitations, to reimburse the applicable Service Provider for the full dollar amount of any Voluntary Reduction incurred after May 1, 2020. A Fund is not obligated to reimburse a Service Provider: (1) more than three years after the end of the fiscal year of the Fund in which the Service Provider provided a Voluntary Reduction; (2) in respect of any business day for which the net annualized one-day yield of the Fund or applicable Class is less than 0.00%; (3) to the extent that the amount of the reimbursement to all Service Providers on any day exceeds fifty percent of the yield (net of all expenses, exclusive of the reimbursement) of the Fund or the applicable class on that day; (4) to the extent that the amount of such reimbursement would cause the Fund's or applicable class's net yield to fall below the Fund's or applicable class's minimum yield; (5) in respect of any such fee waivers and/or expense reimbursements that are necessary to maintain the Fund's Contractual Total Expense Limit (as defined in the Reimbursement Agreement) which is effective at the time of such fee waivers and/or expense reimbursements; or (6) in any manner that would result in a class bearing the cost of a reimbursement to the Service Provider for any class-specific expense (including, without limitation, fees payable in accordance with a plan authorized pursuant to Rule 12b-1 under the 1940 Act, or Shareholder Servicing Agreement or similar arrangement) that was waived or reimbursed to the Fund with respect to a different Class. Any such future reimbursement of an applicable Service Provider may result in the total annual operating expenses with respect to a share class of a Fund exceeding the amount of the expense cap under the contractual expense limitation agreement because the expense is not covered by the agreement.

A discussion regarding the Board's consideration of the Funds' Investment Advisory Agreement is provided in the Funds' Form N-CSR filing with the SEC for the period ended June 30, 2024.

The Administrator, Sub-Administrator and Custodian

The Adviser serves as administrator of each Fund. The amount of the fee paid to the Adviser for administrative services may vary by share class. Each Fund currently pays the Adviser an administrative fee at the annual rate of 0.05% in respect of the class of shares in this Prospectus. State Street Bank and Trust Company (“State Street”), a subsidiary of State Street Corporation, serves as the sub-administrator for the Funds for a fee that is paid by the Adviser. State Street also serves as custodian of the Funds for a separate fee that is paid by the Funds. SSGA FM serves as administrator of the Portfolios and State Street serves as sub-administrator and custodian of the Portfolios.

The Transfer Agent and Dividend Disbursing Agent

SS&C GIDS, Inc. is the Funds' transfer agent and dividend disbursing agent (the “Transfer Agent”).

The Distributor

State Street Global Advisors Funds Distributors, LLC serves as the Funds' distributor (“SSGA FD”) pursuant to the Distribution Agreement between SSGA FD and the Trust.

The Shareholder Servicing Agent

SSGA FD serves as the Funds' shareholder servicing agent pursuant to the Shareholder Servicing Agreement between SSGA FD and the Trust and receives fees from the Funds for the provision and procurement of applicable services. Please see the SAI for more information on SSGA FD's role as the Funds' shareholder servicing agent.

Additional Information

Shareholder Information

Determination of Net Asset Value

For all Funds

The Treasury Plus Fund, the U.S. Government Fund and the ILR Government Fund each determines its NAV per share once each Business Day (as defined below), typically at 5:00 p.m. ET and the Treasury Fund determines its NAV per share once each Business Day, typically at 2:30 p.m. ET (the time when a Fund determines its NAV per share is referred to herein as the “Valuation Time”). The Funds reserve the right to advance the time for accepting purchase or redemption orders and/or the Valuation Time on any day when the NYSE, bond markets (as recommended by The Securities Industry and Financial Markets Association (“SIFMA”)) or any Federal Reserve bank close early, trading on the NYSE is restricted, an emergency arises or as otherwise permitted by the SEC. The Funds reserve the right to continue to accept orders to purchase or redeem shares following the close of the NYSE on any day on which the NYSE closes early, provided that either the Federal Reserve or the bond markets remain open. In addition, the Board may, for any Business Day, decide to change the time as of which a Fund's NAV is calculated in response to new developments such as altered trading hours, or as otherwise permitted by the SEC.

Each Fund seeks to maintain a $1.00 per share NAV and, accordingly, uses the amortized cost valuation method, in compliance with the risk limiting conditions of Rule 2a-7 under the Investment Company Act of 1940, as amended (the “1940 Act”), to value its portfolio instruments. The amortized cost valuation method initially prices an instrument at its cost and thereafter assumes a constant amortization to maturity of any discount or premium, regardless of the impact of fluctuating interest rates on the market value of the instrument.

Shares of the Funds are available for purchase each day on which the NYSE and State Street are open for business (a “Business Day”). In the event the NYSE does not open for business, the Funds may, but are not required to, open for purchase or redemption transactions. The Federal Reserve is closed on certain holidays on which the NYSE is open. These holidays are Columbus Day and Veterans Day. On these holidays, you will not be able to purchase shares by wiring Federal Funds because Federal Funds wiring does not occur on days when the Federal Reserve is closed. In the event that the Funds invoke the right to accept orders to purchase or redeem shares on any day that is not a Business Day, the Fund will post advance notice of these events at: www.ssga.com.

If you hold shares of a Fund through a broker-dealer or other financial intermediary, your intermediary may offer additional services and account features that are not described in this Prospectus. Please contact your intermediary directly for an explanation of these services.

Investing in State Street Institutional Investment Trust Shares

Purchasing Shares

The Funds offer six classes of shares through this Prospectus: Institutional Class, Administration Class, Investment Class, Investor Class, Premier Class and Opportunity Class is available to you subject to the eligibility requirements set forth below. All classes of a Fund share the same investment objective and investments, but the different share classes have different expense structures and eligibility requirements. You should choose the class with the expense structure that best meets your needs for which you are eligible. In choosing a share class, you should consider the amount you plan to invest. Your investment professional can help you choose the share class that best suits your investment needs.

Any applicable minimum purchase amount may be waived for specific investors or types of investors, including, without limitation, retirement plans, employees of State Street Corporation and its affiliates and their family. In the case of shareholders purchasing shares through a Financial Intermediary, the minimum purchase amount may be applied at the level of the Financial Intermediary.

	Institutional Class	Administration Class	Investment Class	Investor Class	Premier Class	Opportunity Class
Minimum Initial Investment	$25,000,000	$1,000	$250	$10,000,000	$250,000,000	$25,000,000
Maximum Investment	None.	None.	None.	None.	None.	None.
Initial Sales Charge	None. Entire purchase price is invested in shares of a Fund.	None. Entire purchase price is invested in shares of a Fund.	None. Entire purchase price is invested in shares of a Fund.	None. Entire purchase price is invested in shares of a Fund.	None. Entire purchase price is invested in shares of a Fund.	None. Entire purchase price is invested in shares of a Fund.
Deferred (CDSC) Sales Charge	None.	None.	None.	None.	None.	None.

	Institutional Class	Administration Class	Investment Class	Investor Class	Premier Class	Opportunity Class
Distribution and/or Service (12b-1) Fees	None.	0.05% annual fee.	0.10% annual fee.	None.	None.	None.

Investors pay no sales load to invest in the shares of the Funds. The price for Fund Shares is the NAV per share.

Purchase requests received by a Fund in good order (a purchase request is in good order if it meets the requirements implemented from time to time by the Transfer Agent or authorized agent of the Fund, and for new accounts includes submission of a completed and signed application and all documentation necessary to open an account) on a Business Day will, if payment is received by FedWire, be priced at the NAV next determined after the order is accepted by the Fund. Payments received by FedWire prior to the last Valuation Times will earn dividend accrual for that purchase.

All purchases that are made by check will be priced with the last valuation price and begin earning dividends the following Business Day after the day the order is accepted. (If you purchase shares by check, your order will not be in good form until the Transfer Agent receives federal funds for the check.) All purchase orders are subject to acceptance by the Funds. The Funds intend to be as fully invested as is practicable; therefore, investments must be made in Federal Funds (i.e., monies credited to the account of the Funds' custodian bank by a Federal Reserve Bank).

The minimum initial investment in Institutional Class, Administration, Investment, Investor, Premier and Opportunity shares of the Funds is $25 million, $1 thousand, $250, $10 million, $250 million and $25 million, respectively, although the Adviser may waive the minimum in its discretion. Holdings of related customer accounts may be aggregated for purposes of determining the minimum investment amount. “Related customer accounts” may include but are not limited to accounts held by the same investment or retirement plan, financial institution, broker, dealer or intermediary. The Funds and the Adviser reserve the right to increase or decrease the minimum amount required to open or maintain an account. There is no minimum subsequent investment, except in relation to maintaining certain minimum account balances (See “Redeeming Shares” below). The Funds require prior notification of subsequent investments in excess of $10 million for the Treasury Fund and $50 million for the ILR Government Fund, U.S. Government Fund and Treasury Plus Fund.

The Funds reserve the right to cease accepting investments at any time or to reject any investment order. In addition, the U.S. Government Fund, the Treasury Plus Fund and the ILR Government Fund may limit the amount of a purchase order received after 3:00 p.m. ET. The Treasury Fund may limit the amount of a purchase order received after 12:00 p.m. (noon) ET.

How to Purchase Shares

By Mail:

An initial investment in the Funds must be preceded or accompanied by a completed, signed Institutional Account

Application Form, sent to:

State Street Funds

P.O. Box 219737

Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds

801 Pennsylvania Avenue, Suite 219737

Kansas City, MO 64105-1307

By Telephone/Fax:

An initial investment in the Funds must be preceded or accompanied by a completed, signed Institutional Account

Application Form, faxed to (816) 218-0400. Call the Fund at (866) 392-0869 between the hours of 8:00 a.m. ET

and 6:00 p.m. ET to:

➢ confirm receipt of the faxed Institutional Account Application Form (initial purchases only),

➢ request your new account number (initial purchases only),

➢ confirm the amount being wired and wiring bank, and

➢ receive a confirmation number for your purchase order (your trade is not effective until you have received a

confirmation number from the Fund).

For your initial investment, send the original, signed Institutional Account Application Form to the address above.

Wire Instructions:

Instruct your bank to transfer money by Federal Funds wire to:

State Street Bank and Trust Company

1 Iron Street

Boston, MA 02210

ABA# 011000028

DDA# 9904-631-0

State Street Institutional Investment Trust

Fund Name

Class Name

Account Number

Account Registration

On Columbus Day and Veterans Day, you will not be able to purchase shares by wiring Federal Funds because the

Federal Funds wiring does not occur on those days. Payment for Fund Shares must be in Federal Funds (or

converted to Federal Funds by the Transfer Agent) by the close of the Federal Reserve.

The Funds and the Funds' agents are not responsible for transfer errors by the sending or receiving bank and will

not be liable for any loss incurred due to a wire transfer not having been received.

Automatic Investment Plan. An Automatic Investment Plan is available for all operational State Street Funds that offer the Administration Class shares. Once an initial investment has been accepted, you may elect to make automatic subsequent investments of $100 or more on a periodic basis (i.e., monthly, quarterly, semi-annually, or annually) by authorizing the Fund to debit your bank checking or savings account through Automated Clearing House (ACH). Once this option has been established, you may call the State Street Funds to make additional automatic purchases, to change the amount of the existing automatic purchase, or to discontinue the service. The Fund reserves the right to cancel your Automatic Investment Plan if any correspondence sent by the Fund to your address of record is returned by the postal service or other delivery service as “undeliverable.” Ask your financial adviser or financial intermediary for details.

Redeeming Shares

An investor may redeem all or any portion of its investment. Redemption orders are processed at the NAV next determined after a Fund receives a redemption order in good form.

If the Treasury Fund, the Treasury Plus Fund, the U.S. Government Fund or the ILR Government Fund receives a redemption order in good form prior to 2:30 p.m. ET for the Treasury Fund and 5:00 p.m. ET for the Treasury Plus Fund, U.S. Government Fund and ILR Government Fund on a Business Day, the Fund typically expects to pay out redemption proceeds on that day, but no later than the next Business Day if redemption proceeds are sent by wire or ACH.

If redemption proceeds are sent by check, the Fund pays out redemption proceeds on the next Business Day. If a full redemption order is requested, no dividends will accrue with respect to shares on the day the redemption proceeds are sent. If a redemption order is placed after 2:30 p.m. ET for the Treasury Fund and 5:00 p.m. ET for the U.S. Government Fund, the Treasury Plus Fund and the ILR Government Fund, the Fund typically expects to pay out redemption proceeds on the next Business Day (and dividends will accrue up to, but not including, the day that redemption proceeds are sent), but no later than the following Business Day. The Fund may postpone and/or suspend redemption and payment beyond the foregoing time periods only as follows:

For any period during which there is a non-routine closure of the Fedwire or applicable Federal Reserve Banks;

For any period (1) during which the NYSE is closed other than customary week-end and holiday closings or (2) during which trading on the NYSE is restricted;

For any period during which an emergency exists as a result of which (1) disposal of securities owned by the Fund is not reasonably practicable or (2) it is not reasonably practicable for the Fund to fairly determine the net asset value of shares of the Fund;

For any period during which the SEC has, by rule or regulation, deemed that (1) trading shall be restricted or (2) an emergency exists;

For any period that the SEC, may by order permit for your protection; or

For any period during which the Fund as part of a necessary liquidation of the fund, has properly postponed and/or suspended redemption of shares and payment in accordance with federal securities laws.

Rule 2a-7 as adopted by the SEC permits a money market fund to impose a liquidity fee upon the sale of fund shares under certain circumstances, however the Funds are all government money market funds that have not elected to be subject to the liquidity fee provision of Rule 2a-7. Although each Fund attempts to maintain its NAV at $1.00 per share, there can be no assurance that it will be successful, and there can be no assurance that a shareholder will receive $1.00 per share upon any redemption.

The transfer agent may temporarily delay for more than seven days the disbursement of redemption proceeds from the Fund account of a “Specified Adult” (as defined in Financial Industry Regulatory Authority, Inc. (“FINRA”) Rule 2165) based on a reasonable belief that financial exploitation of the Specified Adult has occurred, is occurring, has been attempted, or will be attempted, subject to certain conditions.

Under normal circumstances, the Funds expect to meet redemption requests by using cash or cash equivalents in its portfolio and/or selling portfolio assets to generate cash. The Funds also may pay redemption proceeds using cash obtained through borrowing arrangements that may be available from time to time.

A Fund may pay all or a portion of your redemption proceeds by giving you securities (for example, if the Fund reasonably believes that a cash redemption may have a substantial impact on the Fund and its remaining shareholders). A redemption is generally a taxable event for shareholders, regardless of whether the redemption is satisfied in cash or in kind. You may pay transaction costs and/or taxes to dispose of the securities, and you may receive less for them than the price at which they were valued for purposes of the redemption. In addition, you will be subject to the market risks associated with such securities until such time as you choose to dispose of the security.

During periods of deteriorating or stressed market conditions or during extraordinary or emergency circumstances, a Fund may be more likely to pay redemption proceeds with cash obtained through short-term borrowing arrangements (if available) or by giving you securities.

A request for a partial redemption by an investor whose account balance is below the minimum amount or a request for partial redemption by an investor that would bring the account below the minimum amount may be treated as a request for a complete redemption of the account. These minimums may be different for investments made through certain financial intermediaries as determined by their policies and may be waived in the Adviser's discretion. The Funds reserve the right to modify minimum account requirements at any time with or without prior notice. The Funds also reserve the right to involuntarily redeem an investor's account if the investor's account balance falls below the applicable minimum amount due to transaction activity.

How to Redeem Shares


By Mail:	Send a signed letter to: State Street Institutional Investment Trust Funds P.O. Box 219737 Kansas City, MO 64121-9737
	The letter should include information necessary to process your request as described below. The Fund may require a medallion guarantee in certain circumstances. See “Medallion Guarantees” below.
By Overnight:	State Street Institutional Investment Trust Funds 801 Pennsylvania Avenue, Suite 219737 Kansas City, MO 64105-1307
By Telephone:	Please call (866) 392-0869 between the hours of 8:00 a.m. and 6:00 p.m. ET.
The Funds will need the following information to process your redemption request:
➢ name(s) of account owners; ➢ account number(s); ➢ the name of the Fund; ➢ your daytime telephone number; and ➢ the dollar amount or number of shares being redeemed.

On any day that the Funds calculate their NAVs earlier than normal, the Funds reserve the right to adjust the times noted above for purchasing and redeeming shares.

Medallion Guarantees. Certain redemption requests must include a medallion guarantee for each registered account owner if any of the following apply:

•

Your account address has changed within the last 10 Business Days.

•

Redemption proceeds are being transferred to an account with a different registration.

•

A wire is being sent to a financial institution other than the one that has been established on your Fund account.

•

Other unusual situations as determined by the Transfer Agent.

The Funds reserve the right to waive medallion guarantee requirements, require a medallion guarantee under other circumstances or reject or delay redemption if the medallion guarantee is not in good form. Medallion guarantees may be provided by an eligible financial institution such as a commercial bank, a FINRA member firm such as a stock broker, a savings association or a national securities exchange. A notary public cannot provide a medallion guarantee. The Funds reserve the right to reject a medallion guarantee if it is not provided by a STAMP Medallion guarantor.

About Telephone Transactions. Telephone transactions are convenient but are not free from risk. Neither the Funds nor the Funds' agents will be responsible for any losses resulting from unauthorized telephone transactions if reasonable security procedures are followed. In addition, you are responsible for: (i) verifying the accuracy of all data and information transmitted by telephone, (ii) verifying the accuracy of your account statements immediately upon receipt, and (iii) promptly notifying the Funds of any errors or inaccuracies, including, without limitation, any errors or inaccuracies relating to shareholder data or information transmitted by telephone. During periods of heavy market activity or other times, it may be difficult to reach the Funds by telephone. If you are unable to reach us by telephone, consider sending written instructions.

The Funds may terminate the receipt of redemption orders by telephone at any time, in which case you may redeem shares by other means.

If you choose to purchase or redeem shares by sending instructions by regular mail, they will not be deemed received in good order until they are released by the post office and redelivered to the Transfer Agent's physical location at 801 Pennsylvania Avenue, Suite 219737 in Kansas City, MO 64105-1307. There will be a time lag, which may be one or more days, between regular mail receipt at the post office box and redelivery to such physical location in Kansas City, and a Fund's NAV may change over those days. You might consider using express rather than regular mail if you believe the time of receipt of your transaction request to be sensitive.

Automatic Withdrawal Plan. An Automatic Withdrawal Plan is available for all operational State Street Funds that offer the Administration Class shares. If your account balance is over $10,000, you may request periodic (i.e., monthly, quarterly, semi-annually, or annually) automatic cash withdrawals on any Business Day of $100 or more, which can be mailed to you, or any person or entity, you designate or sent through Automated Clearing House (ACH) to your designated bank account. Proceeds from such withdrawals will be transmitted to your designated bank account two Business Days after the redemption of shares occurs. No interest will accrue on the amounts represented by the uncashed redemption check(s). Ask your financial adviser or financial intermediary for details.

Exchanging Shares

An exchange occurs when you use the proceeds from the redemption of shares of a Fund in the State Street Institutional Investment Trust to simultaneously purchase shares of a different Fund in the State Street Institutional Investment Trust. Exchanges may be made between different Funds within the same class (i.e., Institutional Class shares for Institutional Class shares; Investor Class shares for Investor Class shares). The account holding the original shares must be registered in the same name as the account holding the new shares received in the exchange. You may make exchange requests by telephone, or by mail. See Purchasing Shares and Redeeming Shares. Exchanges are subject to the terms applicable to the purchases of the fund into which you are exchanging. Exchange privileges may not be available for mutual funds advised by SSGA FM (the “State Street Funds”) and may be suspended or rejected.

Excessive Trading

Because the Funds are money market funds, the Funds' Board has not adopted policies and procedures with respect to frequent purchases and redemptions of Fund shares by Fund shareholders. Nonetheless, the Funds may take any reasonable action that they deem necessary or appropriate to prevent excessive trading in Fund shares without providing prior notification to the account holder. Such action may include rejecting any purchase, in whole or part, including, without limitation, by a person whose trading activity in Fund shares may be deemed harmful to the Fund. While the Funds attempt to discourage such excessive trading, there can be no guarantee that they will be able to identify investors who are engaging in excessive trading or limit their trading practices. Additionally, frequent trades of small amounts may not be detected. The Funds recognize that they may not always be able to detect or prevent excessive trading or other activity that may disadvantage the Funds or their shareholders.

Delivery of Documents to Accounts Sharing an Address

To reduce expenses, we may mail only one copy of the Funds' Prospectus and each annual and semi-annual report to those addresses shared by two or more accounts. If you wish to receive individual copies of these documents, please call us at (866) 392-0869, or contact your financial institution. We will begin sending you individual copies thirty (30) days after receiving your request.

Unclaimed Property

Many states have unclaimed property rules that provide for transfer to the state (also known as “escheatment”) of unclaimed property under various circumstances. These circumstances include inactivity (e.g., no owner-initiated contact for a certain period), returned mail (e.g., when mail sent to a shareholder is returned by the post office as undeliverable), or a combination of both inactivity and returned mail. If a State Street Fund identifies property as unclaimed, it will attempt to contact the shareholder, but if that attempt is unsuccessful, the account may be considered abandoned and escheated to the state after the passage of a certain period of time (as required by applicable state law).

If you are a resident of the state of Texas, you may designate a representative to receive escheatment notifications by completing and submitting a designation form, which you can find on the website of the Texas Comptroller. Designating such a representative may be beneficial, since Texas law provides that the escheatment period will cease if the representative, after receiving an escheatment notification regarding your account, communicates knowledge of your location and confirms that you have not abandoned your account. You can mail a completed designation form to the Fund (if you hold shares directly with the Fund) or to your financial intermediary (if you do not hold shares directly with the Fund).

Dividends, Distributions and Tax Considerations

The Funds intend to declare dividends on shares from net investment income daily and pay them as of the last Business Day of each month. Distributions from capital gains, if any, will be made annually in December. Dividends of investment income and capital gain distributions will be paid in additional shares on the reinvestment date unless you have elected to receive them in cash. No interest will accrue on the amounts represented by uncashed distribution checks. If you have elected to receive distributions by check, and the postal or other delivery service is unable to deliver the checks because of an incorrect mailing address, or if a distribution check remains uncashed for six months, the uncashed distribution and all future distributions will be reinvested at the then-current NAV of the Fund.

Each Fund invests substantially all of its investable assets in a corresponding Portfolio that is treated as a partnership for U.S. federal income tax purposes. Therefore, the nature and character of each Fund's income, gains, losses and deductions generally will be determined at the Portfolio level, and each Fund will be allocated its share of the corresponding Portfolio's income, gains, losses and deductions. As applicable, references in this discussion to income, gains and losses of a Fund will be to income, gains and losses recognized and deductions accruing at the Portfolio level and allocated to or otherwise taken into account by the Fund, and references to assets of a Fund will be to the Fund's allocable share of the assets of the corresponding Portfolio.

Distributions are taxable to you even if they are paid from income or gains earned by a Fund before your investment (and thus were included in the price you paid for your shares). Distributions may also be subject to state and local taxes and are taxable whether you receive them in cash or reinvest them in additional shares. Distributions in excess of a Fund's current and accumulated earnings and profits are treated as a return of capital to the extent of your basis in the applicable Fund's shares, and, in general, as capital gain thereafter.

long-term capital gain, depending upon how long you held the Fund Shares. The Internal Revenue Service (the “IRS”) has issued final regulations and published guidance that permit a simplified method of accounting for gains and losses realized upon the disposition of money market fund shares. Shareholders should see the SAI for further information.

An additional 3.8% Medicare contribution tax is imposed on the “net investment income” of individuals, estates and trusts to the extent their income exceeds certain threshold amounts. Net investment income generally includes for this purpose dividends paid by a Fund and net gains recognized on the redemption (or other taxable disposition) of Fund Shares.

The U.S. Treasury and IRS generally require a Fund to obtain information sufficient to identify the status of each shareholder under sections 1471-1474 of the Internal Revenue Code of 1986, as amended, and the U.S. Treasury and IRS guidance issued thereunder (collectively, “FATCA”) or under an applicable intergovernmental agreement between the United States and a foreign government. Please see the SAI for more information on FATCA reporting requirements.

Financial Intermediary Arrangements

Distribution Arrangements and Rule 12b-1 Fees

The Funds have adopted a distribution plan pursuant to Rule 12b-1 under the 1940 Act under which a Fund may compensate SSGA FD (or others) for services in connection with the distribution of a Fund's shares and for services provided to Fund shareholders (the “Plan”). The Plan calls for payments at an annual rate (based on average daily net assets) of 0.05% and 0.10% of each Fund's net assets attributable to its Administration Class shares and Investment Class shares, respectively. Because these fees are paid out of the assets of a Fund attributable to its shares on an ongoing basis, they will increase the cost of your investment and may cost you more over time than paying other types of sales charges. Long-term shareholders of the Fund may pay more in Rule 12b-1 fees than the economic equivalent of the maximum front-end sales charge permitted by the FINRA.

A Fund may pay distribution fees and other amounts described in this Prospectus at a time when shares of that Fund are unavailable for purchase.

Other Payments to Financial Intermediaries

aries for distribution and/or shareholder services varies. Any compensation is typically a percentage of the value of the Financial Intermediary's clients' investments in the Funds or a per account fee. The variation in compensation may, but will not necessarily, reflect enhanced or additional services provided by the Financial Intermediary.

Third-Party Transactions. The State Street Funds have authorized certain Financial Intermediaries to accept purchase, redemption and exchange orders on the State Street Funds' behalf. Orders received for a State Street Fund by a Financial Intermediary that has been authorized to accept orders on the Fund's behalf (or other Financial Intermediaries designated by the Financial Intermediary) will be deemed accepted by the Fund at the time they are received by the Financial Intermediary and will be priced based on the Fund's next NAV determination as long as the Financial Intermediary transmits the order in good form and in a timely manner to the applicable State Street Fund(s). The Financial Intermediary is responsible for transmitting your orders and associated funds in good form and in a timely manner to the applicable State Street Fund(s). The State Street Funds will not be responsible for delays by the Financial Intermediary in transmitting your orders, including timely transfer of payment, to a Fund.

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Financial Highlights

The financial highlight tables are intended to help you understand each Fund's financial performance for the past five fiscal years or, if shorter, the period since each class' inception. Certain information reflects the performance results for a single Fund Share. The total returns in the table represent the rate that an investor would have earned (or lost) on an investment in each Fund (assuming reinvestment of all dividends and distributions). This information has been audited by Ernst & Young LLP, the Trust's independent registered public accounting firm, whose report, along with each Fund's financial highlights and financial statements, are included in each Fund's Form N-CSR filing, which is available upon request. Any references to Notes in these financial highlight tables refer to the “Notes to Financial Statements” section of each Fund's financial statements, and the financial information included in these tables should be read in conjunction with the financial statements incorporated by reference in the SAI.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL LIQUID RESERVES GOVERNMENT MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Institutional Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$1.0006	$1.0004	$1.0003	$1.0003	$1.0002
Income (loss) from investment operations:
Net investment income (loss)	0.0519	0.0512	0.0166	0.0001	0.0054
Net realized and unrealized gain (loss)	(0.0002 )	0.0002	0.0001	0.0001	0.0002
Total from investment operations	0.0517	0.0514	0.0167	0.0002	0.0056
Distributions to shareholders from:
Net investment income	(0.0519 )	(0.0512 )	(0.0166 )	(0.0002 )	(0.0055 )
Net asset value, end of period	$1.0004	$1.0006	$1.0004	$1.0003	$1.0003
Total return (b)	5.29 %	5.26 %	1.69 %	0.02 %	0.56 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$324,617	$331,002	$258,089	$80,594	$153,757
Ratios to Average Net Assets:
Total expenses	0.15 %	0.15 %	0.15 %	0.15 %	0.15 %
Net expenses	0.15 %	0.15 %	0.15 %	0.15 %	0.15 %
Net investment income (loss)	5.20 %	5.14 %	2.25 %	0.03 %	0.57 %

(a)

The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.

(b)

Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period

reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of

the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL LIQUID RESERVES GOVERNMENT MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Administration Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$1.0005	$1.0003	$1.0000	$1.0001	$1.0001
Income (loss) from investment operations:
Net investment income (loss)	0.0497	0.0490	0.0147	0.0000 (b)	0.0039
Net realized and unrealized gain (loss)	(0.0002 )	0.0002	0.0004	(0.0001 )	—
Total from investment operations	0.0495	0.0492	0.0151	(0.0001 )	0.0039
Distributions to shareholders from:
Net investment income	(0.0497 )	(0.0490 )	(0.0148 )	—	(0.0039 )
Net asset value, end of period	$1.0003	$1.0005	$1.0003	$1.0000	$1.0001
Total return (c)	5.06 %	5.03 %	1.52 %	(0.01 )%	0.39 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$330,850	$241,812	$383,631	$663,480	$567,550
Ratios to Average Net Assets:
Total expenses	0.37 %	0.36 %	0.37 %	0.37 %	0.37 %
Net expenses	0.37 %	0.36 %	0.33 %	0.17 %	0.32 %
Net investment income (loss)	4.92 %	4.85 %	1.32 %	0.00 %(d)	0.43 %

(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(d)	Amount is less than 0.005%.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL LIQUID RESERVES GOVERNMENT MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Investment Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$1.0005	$1.0003	$1.0002	$1.0002	$1.0002
Income (loss) from investment operations:
Net investment income (loss)	0.0488	0.0481	0.0135	0.0000 (b)	0.0036
Net realized and unrealized gain (loss)	(0.0004 )	0.0000 (b)	0.0006	—	—
Total from investment operations	0.0484	0.0481	0.0141	0.0000 (b)	0.0036
Distributions to shareholders from:
Net investment income	(0.0486 )	(0.0479 )	(0.0140 )	—	(0.0036 )
Net asset value, end of period	$1.0003	$1.0005	$1.0003	$1.0002	$1.0002
Total return (c)	4.94 %	4.92 %	1.42 %	0.00 %(d)	0.37 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$7	$6	$6	$6	$6
Ratios to Average Net Assets:
Total expenses	0.47 %	0.45 %	0.48 %	0.48 %	0.45 %
Net expenses	0.47 %	0.45 %	0.42 %	0.17 %	0.35 %
Net investment income (loss)	4.86 %	4.80 %	1.42 %	(0.03 )%	0.38 %

(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(d)	Amount is less than 0.005%.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL LIQUID RESERVES GOVERNMENT MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Investor Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$1.0006	$1.0003	$1.0001	$1.0002	$1.0001
Income (loss) from investment operations:
Net investment income (loss)	0.0514	0.0506	0.0162	0.0000 (b)	0.0049
Net realized and unrealized gain (loss)	(0.0002 )	0.0004	0.0002	(0.0001 )	0.0002
Total from investment operations	0.0512	0.0510	0.0164	(0.0001 )	0.0051
Distributions to shareholders from:
Net investment income	(0.0514 )	(0.0507 )	(0.0162 )	(0.0000 )(b)	(0.0050 )
Net asset value, end of period	$1.0004	$1.0006	$1.0003	$1.0001	$1.0002
Total return (c)	5.24 %	5.22 %	1.65 %	(0.01 )%	0.51 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$79,450	$57,391	$167,654	$131,790	$97,898
Ratios to Average Net Assets:
Total expenses	0.20 %	0.19 %	0.20 %	0.20 %	0.20 %
Net expenses	0.20 %	0.19 %	0.19 %	0.17 %	0.20 %
Net investment income (loss)	5.09 %	4.97 %	1.55 %	0.00 %(d)	0.57 %

(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(d)	Amount is less than 0.005%.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL LIQUID RESERVES GOVERNMENT MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Premier Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$1.0004	$1.0002	$1.0001	$1.0002	$1.0001
Income (loss) from investment operations:
Net investment income (loss)	0.0522	0.0515	0.0168	0.0004	0.0058
Net realized and unrealized gain (loss)	(0.0002 )	0.0002	0.0002	—	0.0001
Total from investment operations	0.0520	0.0517	0.0170	0.0004	0.0059
Distributions to shareholders from:
Net investment income	(0.0522 )	(0.0515 )	(0.0169 )	(0.0005 )	(0.0058 )
Net asset value, end of period	$1.0002	$1.0004	$1.0002	$1.0001	$1.0002
Total return (b)	5.32 %	5.29 %	1.72 %	0.04 %	0.59 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$8,541,337	$12,598,404	$10,442,749	$11,646,151	$14,854,601
Ratios to Average Net Assets:
Total expenses	0.12 %	0.12 %	0.12 %	0.12 %	0.12 %
Net expenses	0.12 %	0.12 %	0.12 %	0.12 %	0.12 %
Net investment income (loss)	5.26 %	5.14 %	1.62 %	0.06 %	0.67 %

(a)

The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.

(b)

Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period

reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of

the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL LIQUID RESERVES GOVERNMENT MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Opportunity Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	For the Period 10/28/21*- 12/31/21
Net asset value, beginning of period	$1.0003	$1.0002	$0.9999	$1.0000
Income (loss) from investment operations:
Net investment income (loss)	0.0519	0.0512	0.0167	0.0000 (b)
Net realized and unrealized gain (loss)	(0.0001 )	0.0001	0.0003	(0.0001 )
Total from investment operations	0.0518	0.0513	0.0170	(0.0001 )
Distributions to shareholders from:
Net investment income	(0.0519 )	(0.0512 )	(0.0167 )	(0.0000 )(b)
Net asset value, end of period	$1.0002	$1.0003	$1.0002	$0.9999
Total return (c)	5.30 %	5.25 %	1.71 %	(0.01 )%
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$89,133	$249,722	$136,312	$50
Ratios to Average Net Assets:
Total expenses	0.15 %	0.15 %	0.15 %	0.15 %(d)
Net expenses	0.15 %	0.15 %	0.15 %	0.15 %(d)
Net investment income (loss)	5.26 %	5.19 %	3.81 %	0.00 %(d)

*	Commencement of operations.
(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(d)	Annualized.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL TREASURY MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Institutional Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Income (loss) from investment operations:
Net investment income (loss)	0.0506	0.0486	0.0152	0.0001	0.0038
Net realized gain (loss)	0.0000 (b)	0.0000 (b)	(0.0010 )	0.0001	—
Total from investment operations	0.0506	0.0486	0.0142	0.0002	0.0038
Distributions to shareholders from:
Net investment income	(0.0506 )	(0.0486 )	(0.0142 )	(0.0001 )	(0.0038 )
Net realized gains	—	—	—	(0.0001 )	—
Total distributions	(0.0506 )	(0.0486 )	(0.0142 )	(0.0002 )	(0.0038 )
Net asset value, end of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Total return (c)	5.18 %	4.97 %	1.42 %	0.01 %	0.38 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$1,470,716	$1,167,964	$1,663,786	$911,380	$244,039
Ratios to Average Net Assets:
Total expenses	0.14 %	0.14 %	0.15 %	0.15 %	0.15 %
Net expenses	0.14 %	0.14 %	0.14 %	0.06 %	0.14 %
Net investment income (loss)	5.05 %	4.86 %	1.52 %	0.01 %	0.12 %

(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL TREASURY MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Administration Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Income (loss) from investment operations:
Net investment income (loss)	0.0475	0.0464	0.0127	0.0009	0.0029
Net realized gain (loss)	0.0009	0.0000 (b)	(0.0002 )	(0.0007 )	(0.0001 )
Total from investment operations	0.0484	0.0464	0.0125	0.0002	0.0028
Distributions to shareholders from:
Net investment income	(0.0484 )	(0.0464 )	(0.0125 )	(0.0001 )	(0.0028 )
Net realized gains	—	—	—	(0.0001 )	—
Total distributions	(0.0484 )	(0.0464 )	(0.0125 )	(0.0002 )	(0.0028 )
Net asset value, end of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Total return (c)	4.95 %	4.74 %	1.26 %	0.00 %(d)	0.28 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$566,084	$53	$50	$50	$325
Ratios to Average Net Assets:
Total expenses	0.36 %	0.36 %	0.36 %	0.37 %	0.37 %
Net expenses	0.36 %	0.36 %	0.30 %	0.07 %	0.18 %
Net investment income (loss)	4.36 %	4.65 %	1.27 %	0.01 %	0.07 %

(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(d)	Amount is less than 0.005%.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL TREASURY MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Investment Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Income (loss) from investment operations:
Net investment income (loss)	0.0474	0.0454	0.0126	0.0000	0.0027
Net realized gain (loss)	0.0000 (b)	0.0000 (b)	(0.0008 )	0.0002	0.0001
Total from investment operations	0.0474	0.0454	0.0118	0.0002	0.0028
Distributions to shareholders from:
Net investment income	(0.0474 )	(0.0454 )	(0.0118 )	(0.0001 )	(0.0027 )
Net realized gains	—	—	—	(0.0001 )	(0.0001 )
Total distributions	(0.0474 )	(0.0454 )	(0.0118 )	(0.0002 )	(0.0028 )
Net asset value, end of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Total return (c)	4.84 %	4.63 %	1.18 %	0.01 %	0.27 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$294,788	$518,476	$366,876	$283,888	$479,954
Ratios to Average Net Assets:
Total expenses	0.46 %	0.46 %	0.47 %	0.47 %	0.47 %
Net expenses	0.46 %	0.46 %	0.41 %	0.06 %	0.26 %
Net investment income (loss)	4.80 %	4.50 %	1.26 %	0.01 %	0.21 %

(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL TREASURY MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Investor Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Income (loss) from investment operations:
Net investment income (loss)	0.0500	0.0481	0.0130	0.0001	0.0035
Net realized gain (loss)	0.0001	0.0000 (b)	0.0008	0.0001	—
Total from investment operations	0.0501	0.0481	0.0138	0.0002	0.0035
Distributions to shareholders from:
Net investment income	(0.0501 )	(0.0481 )	(0.0138 )	(0.0001 )	(0.0035 )
Net realized gains	—	—	—	(0.0001 )	—
Total distributions	(0.0501 )	(0.0481 )	(0.0138 )	(0.0002 )	(0.0035 )
Net asset value, end of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Total return (c)	5.12 %	4.91 %	1.38 %	0.01 %	0.35 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$159,534	$248,928	$493,478	$538,275	$555,517
Ratios to Average Net Assets:
Total expenses	0.19 %	0.19 %	0.20 %	0.20 %	0.20 %
Net expenses	0.19 %	0.19 %	0.17 %	0.06 %	0.17 %
Net investment income (loss)	4.98 %	4.73 %	1.30 %	0.01 %	0.17 %

(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL TREASURY MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Premier Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Income (loss) from investment operations:
Net investment income (loss)	0.0509	0.0489	0.0139	0.0000	0.0040
Net realized gain (loss)	0.0000 (b)	0.0000 (b)	0.0005	0.0002	0.0001
Total from investment operations	0.0509	0.0489	0.0144	0.0002	0.0041
Distributions to shareholders from:
Net investment income	(0.0509 )	(0.0489 )	(0.0144 )	(0.0001 )	(0.0040 )
Net realized gains	—	—	—	(0.0001 )	(0.0001 )
Total distributions	(0.0509 )	(0.0489 )	(0.0144 )	(0.0002 )	(0.0041 )
Net asset value, end of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Total return (c)	5.21 %	5.00 %	1.45 %	0.01 %	0.40 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$10,758,535	$11,472,441	$9,406,734	$11,700,899	$14,707,995
Ratios to Average Net Assets:
Total expenses	0.11 %	0.11 %	0.12 %	0.12 %	0.12 %
Net expenses	0.11 %	0.11 %	0.11 %	0.06 %	0.12 %
Net investment income (loss)	5.08 %	4.89 %	1.39 %	0.01 %	0.33 %

(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL TREASURY MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Opportunity Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	For the Period 10/28/21*- 12/31/21
Net asset value, beginning of period	$1.0000	$1.0000	$1.0000	$1.0000
Income (loss) from investment operations:
Net investment income (loss)	0.0506	0.0486	0.0252	0.0001
Net realized gain (loss)	0.0000 (b)	0.0000 (b)	(0.0110 )	0.0001
Total from investment operations	0.0506	0.0486	0.0142	0.0002
Distributions to shareholders from:
Net investment income	(0.0506 )	(0.0486 )	(0.0142 )	(0.0001 )
Net realized gains	—	—	—	(0.0001 )
Total distributions	(0.0506 )	(0.0486 )	(0.0142 )	(0.0002 )
Net asset value, end of period	$1.0000	$1.0000	$1.0000	$1.0000
Total return (c)	5.18 %	4.97 %	1.43 %	0.00 %(d)
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$213,844	$149,393	$65,406	$50
Ratios to Average Net Assets:
Total expenses	0.14 %	0.14 %	0.15 %	0.15 %(e)
Net expenses	0.14 %	0.14 %	0.15 %	0.05 %(e)
Net investment income (loss)	5.03 %	4.94 %	2.52 %	0.01 %(e)

*	Commencement of operations.
(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(d)	Amount is less than 0.005%.
(e)	Annualized.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL TREASURY PLUS MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Institutional Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Income (loss) from investment operations:
Net investment income (loss)	0.0508	0.0492	0.0157	0.0001	0.0037
Net realized gain (loss)	(0.0000 )(b)	0.0000 (b)	—	—	—
Total from investment operations	0.0508	0.0492	0.0157	0.0001	0.0037
Distributions to shareholders from:
Net investment income	(0.0508 )	(0.0492 )	(0.0157 )	(0.0001 )	(0.0037 )
Net asset value, end of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Total return (c)	5.20 %	5.03 %	1.58 %	0.02 %	0.37 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$5,968,988	$3,278,847	$2,122,508	$278,027	$90,569
Ratios to Average Net Assets:
Total expenses	0.14 %	0.14 %	0.15 %	0.15 %	0.15 %
Net expenses	0.14 %	0.14 %	0.15 %	0.06 %	0.15 %
Net investment income (loss)	5.01 %	5.00 %	2.57 %	0.02 %	0.34 %

(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL TREASURY PLUS MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Administration Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Income (loss) from investment operations:
Net investment income (loss)	0.0486	0.0470	0.0140	0.0001	0.0027
Net realized gain (loss)	(0.0000 )(b)	0.0000 (b)	—	—	—
Total from investment operations	0.0486	0.0470	0.0140	0.0001	0.0027
Distributions to shareholders from:
Net investment income	(0.0486 )	(0.0470 )	(0.0140 )	(0.0001 )	(0.0027 )
Net asset value, end of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Total return (c)	4.96 %	4.80 %	1.41 %	0.00 %(d)	0.27 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$1,889	$3,317	$1,043	$50	$50
Ratios to Average Net Assets:
Total expenses	0.36 %	0.36 %	0.37 %	0.37 %	0.36 %
Net expenses	0.36 %	0.36 %	0.34 %	0.07 %	0.25 %
Net investment income (loss)	4.91 %	4.64 %	2.82 %	0.00 %(d)	0.27 %

(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(d)	Amount is less than 0.005%.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL TREASURY PLUS MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Investment Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Income (loss) from investment operations:
Net investment income (loss)	0.0476	0.0460	0.0133	0.0001	0.0025
Net realized gain (loss)	(0.0000 )(b)	0.0000 (b)	—	—	—
Total from investment operations	0.0476	0.0460	0.0133	0.0001	0.0025
Distributions to shareholders from:
Net investment income	(0.0476 )	(0.0460 )	(0.0133 )	(0.0001 )	(0.0025 )
Net asset value, end of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Total return (c)	4.86 %	4.70 %	1.33 %	0.01 %	0.25 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$11,904	$14,534	$13,378	$23,688	$42,358
Ratios to Average Net Assets:
Total expenses	0.46 %	0.46 %	0.47 %	0.47 %	0.47 %
Net expenses	0.46 %	0.46 %	0.36 %	0.07 %	0.29 %
Net investment income (loss)	4.76 %	4.61 %	1.10 %	0.00 %(d)	0.27 %

(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(d)	Amount is less than 0.005%.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL TREASURY PLUS MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Investor Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Income (loss) from investment operations:
Net investment income (loss)	0.0503	0.0487	0.0153	0.0001	0.0034
Net realized gain (loss)	(0.0000 )(b)	0.0000 (b)	—	—	—
Total from investment operations	0.0503	0.0487	0.0153	0.0001	0.0034
Distributions to shareholders from:
Net investment income	(0.0503 )	(0.0487 )	(0.0153 )	(0.0001 )	(0.0034 )
Net asset value, end of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Total return (c)	5.14 %	4.98 %	1.54 %	0.01 %	0.34 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$8,186,789	$3,073,226	$5,250,351	$2,492,307	$546,563
Ratios to Average Net Assets:
Total expenses	0.19 %	0.19 %	0.20 %	0.20 %	0.20 %
Net expenses	0.19 %	0.19 %	0.19 %	0.07 %	0.18 %
Net investment income (loss)	4.97 %	4.95 %	2.13 %	0.01 %	0.31 %

(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL TREASURY PLUS MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Premier Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Income (loss) from investment operations:
Net investment income (loss)	0.0511	0.0495	0.0160	0.0001	0.0040
Net realized gain (loss)	(0.0000 )(b)	0.0000 (b)	—	—	—
Total from investment operations	0.0511	0.0495	0.0160	0.0001	0.0040
Distributions to shareholders from:
Net investment income	(0.0511 )	(0.0495 )	(0.0160 )	(0.0001 )	(0.0040 )
Net asset value, end of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Total return (c)	5.23 %	5.06 %	1.61 %	0.02 %	0.40 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$34,352,351	$33,902,018	$26,238,411	$16,944,237	$20,004,414
Ratios to Average Net Assets:
Total expenses	0.11 %	0.11 %	0.12 %	0.12 %	0.12 %
Net expenses	0.11 %	0.11 %	0.11 %	0.06 %	0.12 %
Net investment income (loss)	5.09 %	4.96 %	1.83 %	0.02 %	0.33 %

(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL TREASURY PLUS MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Opportunity Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	For the Period 10/28/21*- 12/31/21
Net asset value, beginning of period	$1.0000	$1.0000	$1.0000	$1.0000
Income (loss) from investment operations:
Net investment income (loss)	0.0508	0.0492	0.0157	0.0001
Net realized gain (loss)	0.0000 (b)	0.0000 (b)	—	0.0000 (b)
Total from investment operations	0.0508	0.0492	0.0157	0.0001
Distributions to shareholders from:
Net investment income	(0.0508 )	(0.0492 )	(0.0157 )	(0.0001 )
Net asset value, end of period	$1.0000	$1.0000	$1.0000	$1.0000
Total return (c)	5.20 %	5.03 %	1.58 %	0.00 %(d)
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$646,397	$195,259	$14,727	$50
Ratios to Average Net Assets:
Total expenses	0.14 %	0.14 %	0.15 %	0.15 %(e)
Net expenses	0.14 %	0.14 %	0.15 %	0.04 %(e)
Net investment income (loss)	4.99 %	5.14 %	2.32 %	0.00 %(e)

*	Commencement of operations.
(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(d)	Amount is less than 0.005%.
(e)	Annualized.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL U.S. GOVERNMENT MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Institutional Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Income (loss) from investment operations:
Net investment income (loss)	0.0508	0.0491	0.0156	0.0001	0.0037
Net realized gain (loss)	(0.0000 )(b)	0.0000 (b)	0.0000 (b)	—	0.0000 (b)
Total from investment operations	0.0508	0.0491	0.0156	0.0001	0.0037
Distributions to shareholders from:
Net investment income	(0.0508 )	(0.0491 )	(0.0156 )	(0.0001 )	(0.0037 )
Net asset value, end of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Total return (c)	5.21 %	5.04 %	1.58 %	0.03 %	0.37 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$11,874,488	$10,784,799	$3,373,375	$1,588,396	$1,349,398
Ratios to Average Net Assets:
Total expenses	0.14 %	0.15 %	0.15 %	0.15 %	0.15 %
Net expenses	0.14 %	0.15 %	0.14 %	0.04 %	0.14 %
Net investment income (loss)	5.07 %	5.08 %	2.06 %	0.03 %	0.42 %

(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL U.S. GOVERNMENT MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Administration Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Income (loss) from investment operations:
Net investment income (loss)	0.0486	0.0469	0.0139	0.0001	0.0026
Net realized gain (loss)	(0.0000 )(b)	0.0000 (b)	0.0000 (b)	—	0.0000 (b)
Total from investment operations	0.0486	0.0469	0.0139	0.0001	0.0026
Distributions to shareholders from:
Net investment income	(0.0486 )	(0.0469 )	(0.0139 )	(0.0001 )	(0.0026 )
Net asset value, end of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Total return (c)	4.97 %	4.80 %	1.39 %	0.01 %	0.26 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$1,647,046	$2,479,017	$2,250,119	$2,230,490	$2,550,831
Ratios to Average Net Assets:
Total expenses	0.36 %	0.36 %	0.37 %	0.37 %	0.37 %
Net expenses	0.36 %	0.36 %	0.30 %	0.07 %	0.23 %
Net investment income (loss)	4.88 %	4.71 %	1.39 %	0.01 %	0.20 %

(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL U.S. GOVERNMENT MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Investment Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Income (loss) from investment operations:
Net investment income (loss)	0.0476	0.0459	0.0132	0.0001	0.0025
Net realized gain (loss)	(0.0000 )(b)	0.0000 (b)	0.0000 (b)	—	0.0000 (b)
Total from investment operations	0.0476	0.0459	0.0132	0.0001	0.0025
Distributions to shareholders from:
Net investment income	(0.0476 )	(0.0459 )	(0.0132 )	(0.0001 )	(0.0025 )
Net asset value, end of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Total return (c)	4.87 %	4.69 %	1.33 %	0.01 %	0.25 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$148,521	$278,042	$417,225	$428,088	$483,015
Ratios to Average Net Assets:
Total expenses	0.46 %	0.46 %	0.47 %	0.47 %	0.47 %
Net expenses	0.46 %	0.46 %	0.38 %	0.07 %	0.27 %
Net investment income (loss)	4.80 %	4.53 %	1.32 %	0.01 %	0.32 %

(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL U.S. GOVERNMENT MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Investor Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Income (loss) from investment operations:
Net investment income (loss)	0.0503	0.0486	0.0152	0.0001	0.0033
Net realized gain (loss)	(0.0000 )(b)	0.0000 (b)	0.0000 (b)	—	0.0000 (b)
Total from investment operations	0.0503	0.0486	0.0152	0.0001	0.0033
Distributions to shareholders from:
Net investment income	(0.0503 )	(0.0486 )	(0.0152 )	(0.0001 )	(0.0033 )
Net asset value, end of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Total return (c)	5.15 %	4.97 %	1.53 %	0.01 %	0.33 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$3,326,227	$1,686,830	$1,762,314	$1,063,097	$936,980
Ratios to Average Net Assets:
Total expenses	0.19 %	0.19 %	0.20 %	0.20 %	0.20 %
Net expenses	0.19 %	0.19 %	0.18 %	0.07 %	0.18 %
Net investment income (loss)	5.00 %	4.85 %	1.96 %	0.01 %	0.35 %

(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL U.S. GOVERNMENT MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Premier Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Income (loss) from investment operations:
Net investment income (loss)	0.0511	0.0494	0.0159	0.0001	0.0039
Net realized gain (loss)	(0.0000 )(b)	0.0000 (b)	0.0000 (b)	—	0.0000 (b)
Total from investment operations	0.0511	0.0494	0.0159	0.0001	0.0039
Distributions to shareholders from:
Net investment income	(0.0511 )	(0.0494 )	(0.0159 )	(0.0001 )	(0.0039 )
Net asset value, end of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Total return (c)	5.23 %	5.06 %	1.60 %	0.03 %	0.39 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$143,075,681	$126,252,999	$75,138,139	$84,009,144	$67,604,723
Ratios to Average Net Assets:
Total expenses	0.11 %	0.11 %	0.12 %	0.12 %	0.12 %
Net expenses	0.11 %	0.11 %	0.10 %	0.05 %	0.12 %
Net investment income (loss)	5.09 %	5.01 %	1.63 %	0.03 %	0.33 %

(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL U.S. GOVERNMENT MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Opportunity Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	For the Period 10/28/21*- 12/31/21
Net asset value, beginning of period	$1.0000	$1.0000	$1.0000	$1.0000
Income (loss) from investment operations:
Net investment income (loss)	0.0508	0.0491	0.0156	0.0001
Net realized gain (loss)	(0.0000 )(b)	0.0000 (b)	0.0000 (b)	0.0000 (b)
Total from investment operations	0.0508	0.0491	0.0156	0.0001
Distributions to shareholders from:
Net investment income	(0.0508 )	(0.0491 )	(0.0156 )	(0.0001 )
Net asset value, end of period	$1.0000	$1.0000	$1.0000	$1.0000
Total return (c)	5.20 %	5.03 %	1.58 %	0.00 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$6,001,997	$4,430,079	$2,384,409	$300,002
Ratios to Average Net Assets:
Total expenses	0.14 %	0.14 %	0.15 %	0.15 %(d)
Net expenses	0.14 %	0.14 %	0.14 %	0.04 %(d)
Net investment income (loss)	5.04 %	5.00 %	2.00 %	0.03 %(d)

*	Commencement of operations.
(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of their respective Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(d)	Annualized.

Contacting the State Street Funds

Online:	www.ssga.com	24 hours a day, 7 days a week
Phone:	(877) 521-4083	Monday – Friday 8:00 am – 6:00 pm EST

Written requests should be sent to:

Regular mail	Overnight/Registered, Express, Certified Mail
State Street Funds P.O. Box 219737 Kansas City, MO 64121-9737	State Street Funds 801 Pennsylvania Avenue, Suite 219737 Kansas City, MO 64105-1307

For more information about the Funds:

The Funds' SAI includes additional information about the Funds and is incorporated by reference into this document. Additional information about the Funds' investments is available in the Funds' most recent annual and semi-annual reports to shareholders and in each Fund's Form N-CSR filing. In a Fund's Form N-CSR, you will find the Fund's annual and semi-annual financial statements. The Funds' SAI is available, without charge, upon request. The Funds' annual and semi-annual reports are available, without charge, upon request. Shareholders in the Funds may make inquiries to the Funds to receive such information by calling (877) 521-4083 or the customer service center at the telephone number shown in the accompanying contract prospectus, if applicable. Each Fund's Prospectus, SAI, annual and semi-annual reports to shareholders and other information such as each Fund's financial statements are available, free of charge, on the Funds' website at www.ssga.com.

SSGA Funds Management, Inc

ONE IRON STREET

BOSTON, MASSACHUSETTS 02210

MULTICLSTATPROThe State Street Institutional Investment Trust's Investment Company Act File Number is 811-09819.

Prospectus

April 30, 2025

State Street Institutional
Investment Trust

State Street Aggregate Bond Index Portfolio (SSAFX)

State Street Equity 500 Index II Portfolio (SSEYX)

State Street Global All Cap Equity ex-U.S. Index Portfolio (SSGVX)

State Street Small/Mid Cap Equity Index Portfolio (SSMHX)

An investment in any of the Portfolios offered by this Prospectus is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

TABLE OF CONTENTS

Fund Summaries	1
State Street Aggregate Bond Index Portfolio	1
State Street Equity 500 Index II Portfolio	8
State Street Global All Cap Equity ex-U.S. Index Portfolio	14
State Street Small/Mid Cap Equity Index Portfolio	23
Additional Information About Investment Objectives, Principal Strategies and Risks	30
Additional Information About Non-Principal Investment Strategies and Risks	47
Portfolio Holdings Disclosure	49
Management and Organization	50
Shareholder Information	52
Dividends, Distributions and Tax Considerations	55
Financial Highlights	58
Index/Trademark Licenses/Disclaimers	63

State Street Aggregate Bond Index Portfolio

Investment Objective

The State Street Aggregate Bond Index Portfolio (the “Aggregate Bond Index Portfolio” or the “Portfolio”) seeks to provide investment results that, before fees and expenses, correspond generally to the price and yield performance of an index that tracks the U.S. dollar denominated investment grade bond market over the long term.

Fees and Expenses of the Portfolio

The tables below describe the fees and expenses that you may pay if you buy, hold, and sell shares of the Aggregate Bond Index Portfolio (“Portfolio Shares”). You may pay other fees, such as brokerage commissions and other fees to financial intermediaries which are not reflected in the tables and examples below. The Portfolio's shares are offered exclusively to investors that pay fees to SSGA Funds Management, Inc. (“SSGA FM” or the “Adviser”), the Portfolio's investment adviser, or its affiliates; the Portfolio pays no management fee to SSGA FM, as shown in the table below.

Shareholder Fees (fees paid directly from your investment)

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Management Fee	0.000%
Distribution and/or Shareholder Service (12b-1) Fees	0.000%
Other Expenses	0.021%
Acquired Fund Fees and Expenses	0.002%
Total Annual Fund Operating Expenses	0.023%
Less Fee Waivers and/or Expense Reimbursements1	(0.002%)
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	0.021%

Example:

This Example is intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Portfolio for the time periods indicated, and then sell or hold all of your Portfolio Shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Portfolio's operating expenses remain the same. The calculation of costs for the one-year period takes into account the effect of any current contractual fee waivers and/or reimbursements; and the calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of each such period. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

1 year	3 years	5 years	10 years
$2	$7	$13	$29

Portfolio Turnover:

The Portfolio pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Portfolio Shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Portfolio's performance. During the most recent fiscal year, the Portfolio's portfolio turnover rate was 16% of the average value of its portfolio.

Principal Investment Strategies

The Portfolio is an “index” fund that seeks to track, before fees and expenses, the total return performance of the Bloomberg U.S. Aggregate Bond Index (the “U.S. Aggregate Bond Index” or sometimes referred to in context as the “Index”) over the long term. As an “index” fund, the Portfolio is not managed according to traditional methods of “active” investment management, which involve the buying and selling of securities based upon economic, financial and market analysis and investment judgment.

Under normal circumstances, the Portfolio generally invests substantially all, but at least 80%, of its net assets (plus borrowings, if any) in securities comprising the Index or in securities that the Adviser determines have economic characteristics that are comparable to the economic characteristics of securities that comprise the Index. The notional value of the Portfolio's investments in derivatives or other synthetic instruments that provide exposures comparable, in the judgment of the Adviser, to investments in the Index may be counted toward satisfaction of this 80% policy. The Portfolio will provide shareholders with at least sixty (60) days' notice prior to any change in this 80% investment policy. The Portfolio may also invest in other debt securities, cash and cash equivalents or money market instruments, such as repurchase agreements and money market funds (including money market funds advised by the Adviser).

The Portfolio may at times purchase or sell futures contracts on fixed-income securities, or options on those futures, in lieu of investing directly in fixed-income securities themselves. The Portfolio may also purchase or sell futures contracts and related options on the Index (or other fixed-income securities indices). The Portfolio might do so, for example, in order to adjust the interest-rate sensitivity of the Portfolio to bring the characteristics of the Portfolio more closely in line with those of the Index. It might also do so to increase its investment exposure pending investment of cash in bonds or other investments or to reduce its investment exposure in situations where it intends to sell a portion of the securities in its portfolio but the sale has not yet been completed. The Portfolio may also enter into other derivatives transactions, including the use of options or swap transactions, in lieu of investing directly in the stocks making up the Index. The Portfolio may, to the extent permitted by applicable law, invest in shares of other mutual funds whose investment objectives and policies are similar to those of the Portfolio (including funds advised by the Adviser).

The Portfolio expects typically to invest a significant portion of its assets in U.S. agency mortgage pass-through securities up to a total weight that is comparable to that of the Index. Most transactions in mortgage pass-through securities occur through standardized contracts for future delivery in which the exact mortgage pools to be delivered are not specified until a few days prior to settlement, referred to as a “to-be-announced transaction” or “TBA Transaction.” In a TBA Transaction, the buyer and seller agree upon general trade parameters such as agency, settlement date, par amount and price. The actual pools delivered generally are determined two days prior to the settlement date; however, it is not anticipated that the Portfolio will receive pools, but instead will participate in rolling TBA Transactions. The Portfolio expects to enter into such contracts on a regular basis.

The Index is sponsored by Bloomberg Index Services Limited (the “Index Provider”) which is not affiliated with the Portfolio or the Adviser. The Index Provider determines the composition of the Index, relative weightings of the securities in the Index and publishes information regarding the market value of the Index.

Principal Risks of investing in the Portfolio

The Portfolio is subject to the following principal risks. You could lose money by investing in the Portfolio. Certain risks relating to instruments and strategies used in the management of the Portfolio are placed first. The significance of any specific risk to an investment in the Portfolio will vary over time, depending on the composition of the Portfolio's portfolio, market conditions, and other factors. You should read all of the risk information presented below carefully, because any one or more of these risks may result in losses to the Portfolio. An investment in the Portfolio is subject to investment risks, including possible loss of principal, is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation (“FDIC”) or any other government agency. The Portfolio may not achieve its investment objective. The Portfolio is not intended to be a complete investment program, but rather is intended for investment as part of a diversified investment portfolio. Investors should consult their own advisers as to the role of the Portfolio in their overall investment programs.

Market Risk: The Portfolio's investments are subject to changes in general economic conditions, general market fluctuations and the risks inherent in investment in securities markets. Investment markets can be volatile and prices of investments can change substantially due to various factors including, but not limited to, economic growth or recession, changes in interest rates, inflation, changes in the actual or perceived creditworthiness of issuers, and general market liquidity. The Portfolio is subject to the risk that geopolitical events will disrupt securities markets and adversely affect global economies and markets. Local, regional or global events such as war, military conflicts, acts of terrorism, trade policy changes or disputes, the threat or actual imposition of tariffs, natural disasters, the spread of infectious illness or other public health issues, or other events could have a significant impact on the Portfolio and its investments.

Debt Securities Risk: The values of debt securities may increase or decrease as a result of the following: market fluctuations, changes in interest rates, actual or perceived inability or unwillingness of issuers, guarantors or liquidity providers to make scheduled principal or interest payments, or illiquidity in debt securities markets. To the extent that interest rates rise, certain underlying obligations may be paid off substantially slower than originally anticipated and the value of those securities may fall sharply. A rising interest rate environment may cause the value of the Portfolio's fixed income securities to decrease, an adverse impact on the liquidity of the Portfolio's fixed income securities, and increased volatility of the fixed income markets. During periods when interest rates are at low levels, the Portfolio's yield can be low, and the Portfolio may have a negative yield (i.e., it may lose money on an operating basis). To the extent that interest rates fall, certain underlying obligations may be paid off substantially faster than originally anticipated. If the principal on a debt obligation is prepaid before expected, the prepayments of principal may have to be reinvested in obligations paying interest at lower rates. During periods of falling interest rates, the income received by the Portfolio may decline. Changes in interest rates will likely have a greater effect on the values of debt securities of longer durations. Returns on investments in debt securities could trail the returns on other investment options, including investments in equity securities. High levels of inflation and/or a significantly changing interest rate environment can lead to heightened levels of volatility and reduced liquidity.

Mortgage-Related and Other Asset-Backed Securities Risk: Investments in mortgage-related and other asset-backed securities are subject to the risk of significant credit downgrades, illiquidity, and defaults to a greater extent than many other types of fixed-income investments. The liquidity of mortgage-related and asset-backed securities may change over time. During periods of falling interest rates, mortgage- and asset-backed securities may be called or prepaid, which may result in the Portfolio having to reinvest proceeds in other investments at a lower interest rate. During periods of rising interest rates, the average life of mortgage- and asset-backed securities may extend, which may lock in a below-market interest rate, increase the security's duration and interest rate sensitivity, and reduce the value of the security. Enforcing rights against the underlying assets or collateral may be difficult, and the underlying assets or collateral may be insufficient if the issuer defaults.

Indexing Strategy/Index Tracking Risk: The Portfolio is managed with an indexing investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of the Index or of the actual securities comprising the Index. This differs from an actively-managed fund, which typically seeks to outperform a benchmark index. As a result, the Portfolio's performance may be less favorable than that of a portfolio managed using an active investment strategy. The structure and composition of the Index will affect the performance, volatility, and risk of the Index and, consequently, the performance, volatility, and risk of the Portfolio. While the Adviser seeks to track the performance of the Index (i.e., achieve a high degree of correlation with the Index), the Portfolio's return may not match the return of the Index. The Portfolio incurs a number of operating expenses not applicable to the Index, and incurs costs in buying and selling securities. In addition, the Portfolio may not be fully invested at times, generally as a result of cash flows into or out of the Portfolio or reserves of cash held by the Portfolio to meet redemptions. The Adviser may attempt to replicate the Index return by investing in fewer than all of the securities in the Index, or in some securities not included in the Index, potentially increasing the risk of divergence between the Portfolio's return and that of the Index.

Counterparty Risk: The Portfolio will be subject to credit risk with respect to the counterparties with which the Portfolio enters into derivatives contracts, repurchase agreements, reverse repurchase agreements, and other transactions. If a counterparty fails to meet its contractual obligations, the Portfolio may be unable to terminate or realize any gain on the investment or transaction, or to recover collateral posted to the counterparty, resulting in a loss to the Portfolio. If the Portfolio holds collateral posted by its counterparty, it may be delayed or prevented from realizing on the collateral in the event of a bankruptcy or insolvency proceeding relating to the counterparty.

Derivatives Risk: Derivative transactions can create investment leverage and may have significant volatility. It is possible that a derivative transaction will result in a much greater loss than the principal amount invested, that changes in the value of a derivative transaction may not correlate perfectly with the underlying asset, and that the Portfolio may not be able to close out a derivative transaction at a favorable time or price. The counterparty to a derivatives contract may be unable or unwilling to make timely settlement payments, return the Portfolio's margin, or otherwise honor its obligations. A derivatives transaction may not behave in the manner anticipated by the Adviser or may not have the effect on the Portfolio anticipated by the Adviser.

Income Risk: The Portfolio's income may decline due to falling interest rates or other factors. Issuers of securities held by the Portfolio may call or redeem the securities during periods of falling interest rates, and the Portfolio would likely be required to reinvest in securities paying lower interest rates. If an obligation held by the Portfolio is prepaid, the Portfolio may have to reinvest the prepayment in other obligations paying income at lower rates.

addition, a large number of shareholders collectively may purchase or redeem Portfolio Shares in large amounts rapidly or unexpectedly (collectively, such transactions are referred to as “large shareholder transactions”). Large shareholder transactions could adversely affect the ability of the Portfolio to conduct its investment program.

Liquidity Risk: Lack of a ready market, stressed market conditions, or restrictions on resale may limit the ability of the Portfolio to sell a security at an advantageous time or price or at all. Illiquid investments may trade at a discount from comparable, more liquid investments and may be subject to wide fluctuations in market value. Illiquidity of the Portfolio's holdings may also limit the ability of the Portfolio to obtain cash to meet redemptions on a timely basis. In addition, the Portfolio, due to limitations on investments in any illiquid investments and/or the difficulty in purchasing and selling such investments, may be unable to achieve its desired level of exposure to a certain market or sector.

Risk of Investment in Other Pools: If the Portfolio invests in another pooled investment vehicle, it is exposed to the risk that the other pool will not perform as expected and is exposed indirectly to all of the risks applicable to an investment in such other pool. The investment policies of the other pool may not be the same as those of the Portfolio; as a result, an investment in the other pool may be subject to additional or different risks than those to which the Portfolio is typically subject. The Portfolio bears its proportionate share of the fees and expenses of any pool in which it invests. The Adviser or an affiliate may serve as investment adviser to a pool in which the Portfolio may invest, leading to potential conflicts of interest. It is possible that other clients of the Adviser or its affiliates will purchase or sell interests in a pool sponsored or managed by the Adviser or its affiliates at prices and at times more favorable than those at which the Portfolio does so.

Unconstrained Sector Risk: The Portfolio may invest a substantial portion of its assets within one or more economic sectors or industries, which may change from time to time. Greater investment focus on one or more sectors or industries increases the potential for volatility and the risk that events negatively affecting such sectors or industries could reduce returns, potentially causing the value of the Portfolio's Shares to decrease, perhaps significantly.

Valuation Risk: Certain portfolio holdings may be valued on the basis of factors other than market quotations. This may occur more often in times of market turmoil or reduced liquidity. There are multiple methods that can be used to value a portfolio holding when market quotations are not readily available. The value established for any portfolio holding at a point in time might differ from what would be produced using a different methodology or if it had been priced using market quotations. Portfolio holdings that are valued using techniques other than market quotations, including “fair valued” securities, may be subject to greater fluctuation in their valuations from one day to the next than if market quotations were used. In addition, there is no assurance that the Portfolio could sell or close out a portfolio position for the value established for it at any time, and it is possible that the Portfolio would incur a loss because a portfolio position is sold or closed out at a discount to the valuation established by the Portfolio at that time. Investors who purchase or redeem Portfolio Shares on days when the Portfolio is holding fair-valued investments may receive fewer or more shares or lower or higher redemption proceeds than they would have received if the Portfolio had not fair-valued the holding(s) or had used a different valuation methodology.

When-Issued, TBA and Delayed Delivery Securities Risk: The Portfolio may purchase securities on a when-issued, to-be-announced (“TBA”) or delayed delivery basis and may purchase securities on a forward commitment basis. The purchase price of the securities is typically fixed at the time of the commitment, but delivery and payment can take place a month or more after the date of the commitment. At the time of delivery of the securities, the value may be more or less than the purchase or sale price. Purchase of securities on a when-issued, TBA, delayed delivery, or forward commitment basis may give rise to investment leverage, and may result in increased volatility of the Portfolio's net asset value. Default by, or bankruptcy of, a counterparty to a when-issued, TBA or delayed delivery transaction would expose the Portfolio to possible losses because of an adverse market action, expenses or delays in connection with the purchase or sale of the pools specified in such transaction. The Financial Industry Regulatory Authority, Inc. (“FINRA”) imposes mandatory margin requirements for certain types of when-issued, delayed delivery or forward commitment transactions (including TBA transactions), with limited exceptions. Such transactions require mandatory collateralization which may increase the cost of such transactions and impose added operational complexity.

Performance

The bar chart and table below provide some indication of the risks of investing in the Portfolio by illustrating the variability of the Portfolio's returns from year-to-year and by showing how the Portfolio's average annual returns for the periods indicated compared with those of the Index. The Portfolio's past performance does not necessarily indicate how the Portfolio will perform in the future. Current performance information for the Portfolio is available toll free by calling (800) 997-7327 or by visiting our website at www.ssga.com.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	6.70%	Q4 2023
Lowest Quarterly Return	-5.97%	Q1 2022

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Ten Years
Return Before Taxes	1.34 %	-0.33 %	1.30 %
Return After Taxes on Distributions	-0.18 %	-1.46 %	0.15 %
Return After Taxes on Distributions and Sale of Fund Shares	0.79 %	-0.70 %	0.51 %
Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)	1.25 %	-0.33 %	1.35 %

The Portfolio will make updated performance information, including its current net asset value, available at the Portfolio's website: www.ssga.com.

Investment Adviser

SSGA FM serves as the investment adviser to the Portfolio.

The professionals primarily responsible for the day-to-day management of the Portfolio are Marc DiCosimo, Joanna Madden and Michael Przygoda. They have served as portfolio managers of the Portfolio since 2014, 2016 and 2023, respectively.

Marc DiCosimo, CFA, is a Vice President of the Adviser and a Senior Portfolio Manager in the Fixed Income Beta Solutions Group. He joined the Adviser in 2013.

Joanna Madden is a Vice President of the Adviser and a Portfolio Manager in the Fixed Income Beta Solutions Group. She joined the Adviser in 2003.

Michael Przygoda, CFA, is a Vice President of the Adviser and a Portfolio Manager in the Fixed Income Beta Solutions Group. He joined the Adviser in 2006.

Purchase and Sale of Portfolio Shares

Generally, shares of the Portfolio may be purchased only by or on behalf of other registered investment companies or private clients that compensate the Adviser or its affiliates directly.

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

To establish an account	None
To add to an existing account	None

You may purchase or redeem Portfolio Shares on any day the Portfolio is open for business.

Written Requests and Wire Transfers. You may purchase or redeem Portfolio Shares by written request or wire transfer.

Written requests should be sent to:

By Mail:

State Street Corporation
Attention: Transfer Agent
Box 5493
Mail Code: OHD0100
North Quincy, MA 02171

By Overnight/Registered, Express, Certified Mail:

State Street Corporation
Attention: Transfer Agent
1 Heritage Drive
North Quincy, MA 02171

By Intermediary:

If you wish to purchase or redeem Portfolio Shares through a broker, bank or other financial intermediary (“Financial Intermediary”), please contact that Financial Intermediary directly. Your Financial Intermediary may have different or additional requirements for opening an account and/or for the processing of purchase and redemption orders, or may be closed at times when the Portfolio is open.

Financial Intermediaries may contact State Street Dealer Services Group at 617-662-7300 or email them at broker-dealerservices@statestreet.com with questions.

Tax Information

The Portfolio's distributions are expected to be taxed as ordinary income and/or capital gains, unless you are investing through a tax-advantaged arrangement, such as a 401(k) plan or IRA. Any withdrawals made from such tax-advantaged arrangement may be taxable to you.

Payments to Broker-Dealers and Other Financial Intermediaries

If you purchase Portfolio Shares through a broker-dealer or other Financial Intermediary (such as a bank), the Adviser or its affiliates may pay the Financial Intermediary for certain activities related to the Portfolio, including educational training programs, conferences, the development of technology platforms and reporting systems, or other services related to the sale or promotion of the Portfolio. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your salesperson to recommend the Portfolio over another investment. Ask your salesperson or visit your Financial Intermediary's website for more information.

State Street Equity 500 Index II Portfolio

Investment Objective

The State Street Equity 500 Index II Portfolio (the “Equity 500 Index II Portfolio” or the “Portfolio”) seeks to provide investment results that, before expenses, correspond generally to the total return of the S&P 500® Index (the “S&P 500” or sometimes referred to in context as the “Index”).

Fees and Expenses of the Portfolio

The tables below describe the fees and expenses that you may pay if you buy, hold, and sell shares of the Equity 500 Index II Portfolio (“Portfolio Shares”). You may pay other fees, such as brokerage commissions and other fees to financial intermediaries which are not reflected in the tables and examples below. The Portfolio's shares are offered exclusively to investors that pay fees to SSGA Funds Management, Inc. (“SSGA FM” or the “Adviser”), the Portfolio's investment adviser, or its affiliates; the Portfolio pays no management fee to SSGA FM, as shown in the table below.

Shareholder Fees (fees paid directly from your investment)

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Management Fee	0.00%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%
Other Expenses	0.02%
Total Annual Fund Operating Expenses	0.02%

Example:

1 year	3 years	5 years	10 years
$2	$6	$11	$26

Portfolio Turnover:

Principal Investment Strategies

The Portfolio uses a passive management strategy designed to track the performance of the S&P 500. The Index is a well-known stock market index that includes common stocks of 500 companies from a number of sectors and that measures the performance of the large-cap sector of the U.S. equities market. As of February 28, 2025, a significant portion of the Index comprised companies in the information technology, healthcare and financials sectors, although this may change from time to time.

The Portfolio is not managed according to traditional methods of “active” investment management, which involve the buying and selling of securities based upon economic, financial and market analysis and investment judgment. Instead, the Portfolio, using a “passive” or “indexing” investment approach, seeks to provide investment results that, before expenses, correspond generally to the total return of the S&P 500.

The Portfolio generally intends to invest in all stocks comprising the S&P 500 in approximate proportion to their weightings in the Index. However, under various circumstances, it may not be possible or practicable to purchase all stocks in those weightings. In those circumstances, the Portfolio may purchase a sample of the stocks in the Index in proportions expected by SSGA Funds Management, Inc. (“SSGA FM” or the “Adviser”), the investment adviser to the Portfolio, to match generally the performance of the Index as a whole. In addition, from time to time, stocks are added to or removed from the Index. The Portfolio may sell securities that are represented in the Index, or purchase securities that are not yet represented in the Index, in anticipation of their removal from or addition to the Index. Under normal circumstances, the Portfolio generally invests substantially all, but at least 80%, of its net assets (plus borrowings, if any) in securities comprising the Index or in securities that the Adviser determines have economic characteristics that are comparable to the economic characteristics of securities that comprise the Index. The notional value of the Portfolio's investments in derivatives or other synthetic instruments that provide exposures comparable, in the judgment of the Adviser, to investments in the Index may be counted toward satisfaction of this 80% policy. Shareholders will receive sixty (60) days' notice prior to a change in the 80% investment policy. In addition, the Portfolio may invest in equity securities that are not included in the Index, cash and cash equivalents or money market instruments, such as repurchase agreements and money market funds (including money market funds advised by the Adviser).

The Portfolio may at times purchase or sell futures contracts, or options on those futures, in lieu of investing directly in the stocks making up the Index. The Portfolio might do so, for example, in order to increase its investment exposure pending investment of cash in the stocks comprising the Index. Alternatively, the Portfolio might use futures or options on futures to reduce its investment exposure in situations where it intends to sell a portion of the stocks in its portfolio but the sale has not yet been completed. The Portfolio may also enter into other derivatives transactions, including the use of options or swap transactions, in lieu of investing directly in the stocks making up the Index. The Portfolio may also, to the extent permitted by applicable law, invest in shares of other mutual funds whose investment objectives and policies are similar to those of the Portfolio (including funds advised by the Adviser).

Principal Risks of investing in the Portfolio

Equity Investing Risk: The market prices of equity securities owned by the Portfolio may go up or down, sometimes rapidly or unpredictably. The value of a security may decline for a number of reasons that may directly relate to the issuer and also may decline due to general industry or market conditions that are not specifically related to a particular company. In addition, equity markets tend to move in cycles, which may cause stock prices to fall over short or extended periods of time.

Information Technology Sector Risk: Market or economic factors impacting information technology companies could have a major effect on the value of the Portfolio's investments. The value of stocks of information technology companies is particularly vulnerable to rapid changes in technology product cycles, rapid product obsolescence, government regulation and competition, both domestically and internationally, including competition from foreign competitors with lower production costs. Like other technology companies, information technology companies may have limited product lines, markets, financial resources or personnel. Stocks of technology companies and companies that rely heavily on technology, especially those of smaller, less-seasoned companies, tend to be more volatile than the overall market. Information technology companies are heavily dependent on patent and intellectual property rights, the loss or impairment of which may adversely affect profitability. Additionally, companies in the information technology sector may face dramatic and often unpredictable changes in growth rates and competition for the services of qualified personnel.

Derivatives Risk: Derivative transactions can create investment leverage and may have significant volatility. It is possible that a derivative transaction will result in a much greater loss than the principal amount invested, that changes in the value of a derivative transaction may not correlate perfectly with the underlying asset, and that the Portfolio may not be able to close out a derivative transaction at a favorable time or price. The counterparty to a derivatives contract may be unable or unwilling to make timely settlement payments, return the Portfolio's margin, or otherwise honor its obligations. A derivatives transaction may not behave in the manner anticipated by the Adviser or may not have the effect on the Portfolio anticipated by the Adviser.

their assets, take action to raise capital (such as the issuance of debt or equity securities), or cease operations. Credit losses resulting from financial difficulties of borrowers and financial losses associated with investment activities can negatively impact the sector. Insurance companies may be subject to severe price competition. Adverse economic, business or political developments could adversely affect financial institutions engaged in mortgage finance or other lending or investing activities directly or indirectly connected to the value of real estate.

Large Transactions Risk: To the extent a large proportion of the shares of the Portfolio are held by a small number of shareholders (or a single shareholder), including funds or accounts over which the Adviser has investment discretion, the Portfolio is subject to the risk that these shareholders will purchase or redeem Portfolio Shares in large amounts rapidly or unexpectedly, including as a result of an asset allocation decision made by the Adviser. In addition, a large number of shareholders collectively may purchase or redeem Portfolio Shares in large amounts rapidly or unexpectedly (collectively, such transactions are referred to as “large shareholder transactions”). Large shareholder transactions could adversely affect the ability of the Portfolio to conduct its investment program.

Performance

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	20.51%	Q2 2020
Lowest Quarterly Return	-19.59%	Q1 2020

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Ten Years
Return Before Taxes	24.99 %	14.45 %	13.05 %
Return After Taxes on Distributions	24.10 %	13.58 %	11.91 %
Return After Taxes on Distributions and Sale of Fund Shares	14.86 %	11.22 %	10.28 %
S&P 500 Index (reflects no deduction for fees, expenses or taxes)	25.02 %	14.53 %	13.10 %

The Portfolio will make updated performance information, including its current net asset value, available at the Portfolio's website: www.ssga.com.

Investment Adviser

SSGA FM serves as the investment adviser to the Portfolio.

The professionals primarily responsible for the day-to-day management of the Portfolio are Karl Schneider and Amy Scofield each of which has served as a portfolio manager of the Portfolio since inception in 2014.

Karl Schneider, CAIA, is a Managing Director of the Adviser and Co-Head of the Systematic Equity Group in the Americas. He joined the Adviser in 1997.

Amy Scofield is a Vice President of the Adviser and a Portfolio Manager in the Systematic Equity Group. She joined the Adviser in 2010.

Purchase and Sale of Portfolio Shares

Generally, shares of the Portfolio may be purchased only by or on behalf of other registered investment companies or private clients that compensate the Adviser or its affiliates directly.

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

To establish an account	None
To add to an existing account	None

You may purchase or redeem Portfolio Shares on any day the Portfolio is open for business.

Written Requests and Wire Transfers. You may purchase or redeem Portfolio Shares by written request or wire transfer.

Written requests should be sent to:

By Mail:

State Street Corporation
Attention: Transfer Agent
Box 5493
Mail Code: OHD0100
North Quincy, MA 02171

By Overnight/Registered, Express, Certified Mail:

State Street Corporation
Attention: Transfer Agent
1 Heritage Drive
North Quincy, MA 02171

By Intermediary:

Financial Intermediaries may contact State Street Dealer Services Group at 617-662-7300 or email them at broker-dealerservices@statestreet.com with questions.

Tax Information

The Portfolio's distributions are expected to be taxed as ordinary income, qualified dividend income and/or capital gains, unless you are investing through a tax-advantaged arrangement, such as a 401(k) plan or IRA. Any withdrawals made from such tax-advantaged arrangement may be taxable to you.

Payments to Broker-Dealers and Other Financial Intermediaries

State Street Global All Cap Equity ex-U.S. Index Portfolio

Investment Objective

The State Street Global All Cap Equity ex-U.S. Index Portfolio (the “Global All Cap Equity ex-U.S. Index Portfolio” or the “Portfolio”) seeks to provide investment results that, before fees and expenses, correspond generally to the total return performance of a broad-based index of world (ex-U.S.) equity markets over the long term.

Fees and Expenses of the Portfolio

The tables below describe the fees and expenses that you may pay if you buy, hold, and sell shares of the Global All Cap Equity ex-U.S. Index Portfolio (“Portfolio Shares”). You may pay other fees, such as brokerage commissions and other fees to financial intermediaries which are not reflected in the tables and examples below. The Portfolio's shares are offered exclusively to investors that pay fees to SSGA Funds Management, Inc. (“SSGA FM” or the “Adviser”), the Portfolio's investment adviser, or its affiliates; the Portfolio pays no management fee to SSGA FM, as shown in the table below.

Shareholder Fees (fees paid directly from your investment)

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Management Fee	0.00%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%
Other Expenses	0.04%
Total Annual Fund Operating Expenses	0.04%

Example:

1 year	3 years	5 years	10 years
$4	$13	$23	$51

Portfolio Turnover:

Principal Investment Strategies

financials, industrials and information technology sectors, although this may change from time to time. As of February 28, 2025, a significant portion of the Index comprised companies located in Japan and the United Kingdom and a significant portion of the Index constituents are denominated in the Euro and Yen, although this may change from time to time.

In seeking to track the performance of the Index, the Portfolio employs a sampling strategy, which means that the Portfolio is not required to purchase all of the securities represented in the Index. Instead, the Portfolio may purchase a subset of the securities in the Index in an effort to hold a portfolio of securities with generally the same risk and return characteristics of the Index. The number of holdings in the Portfolio will be based on a number of factors, including asset size of the Portfolio. SSGA Funds Management, Inc. (“SSGA FM” or the “Adviser”), the investment adviser to the Portfolio, generally expects the Portfolio to hold fewer than the total number of securities in the Index, but reserves the right to hold as many securities as it believes necessary to achieve the Portfolio's investment objective.

Under normal circumstances, the Portfolio generally invests substantially all, but at least 80%, of its net assets (plus borrowings, if any) in securities comprising the Index or in American Depositary Receipts (“ADRs”) or Global Depositary Receipts (“GDRs”) providing exposure to securities comprising the Index. The notional value of the Portfolio's investments in derivatives or other synthetic instruments that provide exposures comparable, in the judgment of the Adviser, to investments in the Index may be counted toward satisfaction of this 80% policy. The Portfolio will provide shareholders with at least sixty (60) days' notice prior to any change in this 80% investment policy. In addition, the Portfolio may invest in equity securities that are not included in the Index, cash and cash equivalents or money market instruments, such as repurchase agreements and money market funds (including money market funds advised by the Adviser).

The Portfolio may also purchase or sell futures contracts, or options on those futures, in lieu of investing directly in the stocks making up the Index. The Portfolio might do so, for example, in order to increase its investment exposure pending investment of cash in stocks or other investments. Alternatively, the Portfolio might use futures or options on futures to reduce its investment exposure in situations where it intends to sell a portion of the stocks in its portfolio but the sale has not yet been completed. The Portfolio may also enter into other derivatives transactions, including the use of options, forwards or swap transactions, in lieu of investing directly in the stocks making up the Index. The Portfolio may also, to the extent permitted by applicable law, invest in shares of other mutual funds whose investment objectives and policies are similar to those of the Portfolio (including funds advised by the Adviser).

The Index is sponsored by MSCI Inc. (the “Index Provider”), which is not affiliated with the Portfolio or the Adviser. The Index Provider determines the composition of the Index, relative weightings of the securities in the Index and publishes information regarding the market value of the Index.

Principal Risks of investing in the Portfolio

Non-U.S. Securities Risk: Non-U.S. securities (including depositary receipts) are subject to political, regulatory, and economic risks not present in domestic investments. There may be less information publicly available about a non-U.S. entity than about a U.S. entity, and many non-U.S. entities are not subject to accounting, auditing, legal and financial report standards comparable to those in the United States. Further, such entities and/or their securities may be subject to risks associated with currency controls; expropriation; changes in tax policy; greater market volatility; differing securities market structures; higher transaction costs; and various administrative difficulties, such as delays in clearing and settling portfolio transactions or in receiving payment of dividends. Securities traded on foreign markets may be less liquid (harder to sell) than securities traded domestically. Foreign governments may impose restrictions on the repatriation of capital to the U.S. In addition, to the extent the Portfolio buys securities denominated in a foreign currency, there are special risks such as changes in currency exchange rates and the risk that a foreign government could regulate foreign exchange transactions. In addition, to the extent investments are made in a limited number of countries, events in those countries will have a more significant impact on the Portfolio. Investments in depositary receipts may be less liquid and more volatile than the underlying shares in their primary trading market.

in which the Chinese government has limited or prohibited non-Chinese ownership of such company. The VIE structure does not involve equity ownership in a China-based company but rather involves claims to the China-based company's profits and control of its assets through contractual arrangements. In addition to the risk of government intervention, investments through a VIE structure are subject to the risk that the China-based company (or its officers, directors, or Chinese equity owners) may breach those contractual arrangements, or Chinese law changes in a way that adversely affects the enforceability of these arrangements, or those contracts are otherwise not enforceable under Chinese law, in which case the Fund may suffer significant losses on its investments through a VIE structure with little or no recourse available. If the Chinese government takes action adversely affecting VIE structures, the market value of the Fund's associated portfolio holdings would likely suffer significant, detrimental, and possibly permanent consequences, which could result in substantial investment losses.

Europe: Developed and emerging market countries in Europe will be significantly affected by the fiscal and monetary controls of the Economic and Monetary Union of the European Union (“EMU”). Changes in regulations on trade, decreasing imports or exports, changes in the exchange rate of the euro and recessions among European countries may have a significant adverse effect on the economies of other European countries. In addition, one or more countries may abandon the euro and/or withdraw from the EU. On January 31, 2020, the United Kingdom (“UK”) formally withdrew from the EU (commonly known as “Brexit”). An agreement between the UK and the EU governing their future trade relationship became effective January 1, 2021, but that agreement does not include an agreement on financial services, and it is unlikely that such agreement will be concluded. Moreover, the UK government has started a program of financial services law reform with the ultimate aim of repealing many EU financial services laws that were assimilated into UK law from January 1, 2021, and replacing them with legislation or rules made by the UK government or financial services regulators. Accordingly, uncertainty remains in certain areas as to the future relationship between the UK and the EU. Brexit has already had a significant impact on the UK, Europe, and global economies, and could continue to result in volatility and illiquidity, legal, political, economic and regulatory uncertainties and lower economic growth for these economies that could in turn have an adverse effect on the value of the Portfolio's investments. Any further exits from the EU, or the possibility of such exits, or the abandonment of the euro, may cause additional market disruption globally and introduce new legal and regulatory uncertainties. In addition, a number of countries in Europe have suffered terrorist attacks and additional attacks may occur in the future. Such attacks may cause uncertainty in financial markets and may adversely affect the performance of the issuers to which the Portfolio has exposure.

Currency Risk: The value of the Portfolio's assets may be affected favorably or unfavorably by currency exchange rates, currency exchange control regulations, and delays, restrictions or prohibitions on the repatriation of foreign currencies. Foreign currency exchange rates may have significant volatility, and changes in the values of foreign currencies against the U.S. dollar may result in substantial declines in the values of the Portfolio's assets denominated in foreign currencies.

Depositary Receipts Risk: Investments in depositary receipts may be less liquid and more volatile than the underlying securities in their primary trading market. If a depositary receipt is denominated in a different currency than its underlying securities, the Portfolio will be subject to the currency risk of both the investment in the depositary receipt and the underlying security. Holders of depositary receipts may have limited or no rights to take action with respect to the underlying securities or to compel the issuer of the receipts to take action. The prices of depositary receipts may differ from the prices of securities upon which they are based. To the extent the Portfolio invests in depositary receipts based on securities included in the Index, such differences in prices may increase index tracking risk.

Derivatives Risk: Derivative transactions can create investment leverage and may have significant volatility. It is possible that a derivative transaction will result in a much greater loss than the principal amount invested, that changes in the value of a derivative transaction may not correlate perfectly with the underlying asset, and that the Portfolio may not be able to close out a derivative transaction at a favorable time or price. The counterparty to a derivatives contract may be unable or unwilling to make timely settlement payments, return the Portfolio's margin, or otherwise honor its obligations. A derivatives transaction may not behave in the manner anticipated by the Adviser or may not have the effect on the Portfolio anticipated by the Adviser.

Emerging Markets Risk: Risks of investing in emerging markets include, among others, greater political and economic instability, greater volatility in currency exchange rates, less developed securities markets, increased potential for market manipulation, possible trade barriers, currency transfer restrictions, a more limited number of potential buyers and issuers, an emerging market country's dependence on revenue from particular commodities or international aid, less governmental supervision and regulation, unavailability of currency hedging techniques, differences in auditing and financial reporting standards, less stringent investor protection and disclosure standards, less developed public health systems, and less developed legal systems. There is also the potential for unfavorable action such as expropriation, nationalization, embargoes, and acts of war. The securities of emerging market companies may trade less frequently and in smaller volumes than more widely held securities. Market disruptions or substantial market corrections may limit very significantly the liquidity of securities of certain companies in a particular country or geographic region, or of all companies in the country or region. The Portfolio may be unable to liquidate its positions in such securities at any time, or at a favorable price, in order to meet the Portfolio's obligations. These risks are generally greater for investments in frontier market countries, which typically have smaller economies or less developed capital markets than traditional emerging market countries.

Portfolio's holdings may also limit the ability of the Portfolio to obtain cash to meet redemptions on a timely basis. In addition, the Portfolio, due to limitations on investments in any illiquid investments and/or the difficulty in purchasing and selling such investments, may be unable to achieve its desired level of exposure to a certain market or sector.

Small-, Mid-, and Micro-Capitalization Securities Risk: The securities of small-, mid-, and micro-capitalization companies may be more volatile and may involve more risk than the securities of larger companies. These companies may have limited product lines, markets or financial resources, may lack the competitive strength of larger companies, and may depend on a few key employees. In addition, these companies may have been recently organized and may have little or no track record of success. The securities of smaller companies may trade less frequently and in smaller volumes than more widely held securities. Some securities of smaller issuers may be illiquid or may be restricted as to resale, and their values may have significant volatility. The Portfolio may be unable to liquidate its positions in such securities at any time, or at a favorable price, in order to meet the Portfolio's obligations. Returns on investments in securities of small-, mid-, and micro-capitalization companies could trail the returns on investments in securities of larger companies.

Valuation Risk: Certain portfolio holdings may be valued on the basis of factors other than market quotations. This may occur more often in times of market turmoil or reduced liquidity. There are multiple methods that can be used to value a portfolio holding when market quotations are not readily available. The value established for any portfolio holding at a point in time might differ from what would be produced using a different methodology or if it had been priced using market quotations. Portfolio holdings that are valued using techniques other than market quotations, including “fair valued” securities, may be subject to greater fluctuation in their valuations from one day to the next than if market quotations were used. In addition, there is no assurance that the Portfolio could sell or close out a portfolio position for the value established for it at any time, and it is possible that the Portfolio would incur a loss because a portfolio position is sold or closed out at a discount to the valuation established by the Portfolio at that time. Investors who purchase or redeem Portfolio Shares on days when the Portfolio is holding fair-valued investments may receive fewer or more shares or lower or higher redemption proceeds than they would have received if the Portfolio had not fair-valued the holding(s) or had used a different valuation methodology.

Performance

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	18.27%	Q2 2020
Lowest Quarterly Return	-24.67%	Q1 2020

Average Annual Total Returns (for periods ended 12/31/24)

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. After-tax returns depend on an investor's tax situation and may differ from those shown, and after-tax returns are not relevant to investors who hold their shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”). Effective October 9, 2019 (the “Benchmark Index Change Date”), the Portfolio's benchmark index changed from the MSCI ACWI ex USA Index (the “Previous Benchmark Index”) to the MSCI ACWI ex USA Investable Market Index, consistent with a change in the Portfolio's principal investment strategy to track the performance of the current index. Performance of the Portfolio prior to the Benchmark Index Change Date is therefore based on the Portfolio's investment strategy to track the Previous Benchmark Index.

	One Year	Five Years	Ten Years
Return Before Taxes	5.00 %	4.09 %	4.87 %
Return After Taxes on Distributions	3.71 %	3.03 %	3.80 %
Return After Taxes on Distributions and Sale of Fund Shares	2.96 %	2.69 %	3.33 %
MSCI ACWI ex USA Investable Market Index/MSCI ACWI ex USA Index1 (reflects no deduction for fees, expenses or taxes other than withholding taxes on reinvested dividends)	5.23 %	4.12 %	4.83 %

Returns shown are reflective of the Index for periods beginning on the Benchmark Index Change Date and the Previous Benchmark Index for periods prior to the Benchmark Index Change Date.

The Portfolio will make updated performance information, including its current net asset value, available at the Portfolio's website: www.ssga.com.

Investment Adviser

SSGA FM serves as the investment adviser to the Portfolio.

The professionals primarily responsible for the day-to-day management of the Portfolio are Karl Schneider and Olga Winner. They have served on the Portfolio since inception in 2014.

Karl Schneider, CAIA, is a Managing Director of the Adviser and Co-Head of the Systematic Equity Group in the Americas. He joined the Adviser in 1997.

Olga Winner, CFA, is a Vice President of the Adviser and a Senior Portfolio Manager in the Systematic Equity Group. She joined the Adviser in 2007.

Purchase and Sale of Portfolio Shares

Generally, shares of the Portfolio may be purchased only by or on behalf of other registered investment companies or private clients that compensate the Adviser or its affiliates directly.

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

To establish an account	None
To add to an existing account	None

You may purchase or redeem Portfolio Shares on any day the Portfolio is open for business.

Written Requests and Wire Transfers. You may purchase or redeem Portfolio Shares by written request or wire transfer.

Written requests should be sent to:

By Mail:

State Street Corporation
Attention: Transfer Agent
Box 5493
Mail Code: OHD0100
North Quincy, MA 02171

By Overnight/Registered, Express, Certified Mail:

State Street Corporation
Attention: Transfer Agent
1 Heritage Drive
North Quincy, MA 02171

By Intermediary:

Financial Intermediaries may contact State Street Dealer Services Group at 617-662-7300 or email them at broker-dealerservices@statestreet.com with questions.

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

State Street Small/Mid Cap Equity Index Portfolio

Investment Objective

The State Street Small/Mid Cap Equity Index Portfolio (the “Small/Mid Cap Equity Index Portfolio” or the “Portfolio”) seeks to provide investment results that, before expenses, correspond generally to the total return of an index that tracks the performance of mid-to small- capitalization exchange traded U.S. equity securities.

Fees and Expenses of the Portfolio

The tables below describe the fees and expenses that you may pay if you buy, hold, and sell shares of the Small/Mid Cap Equity Index Portfolio (“Portfolio Shares”). You may pay other fees, such as brokerage commissions and other fees to financial intermediaries which are not reflected in the tables and examples below. The Portfolio's shares are offered exclusively to investors that pay fees to SSGA Funds Management, Inc. (“SSGA FM” or the “Adviser”), the Portfolio's investment adviser, or its affiliates; the Portfolio pays no management fee to SSGA FM, as shown in the table below.

Shareholder Fees (fees paid directly from your investment)

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Management Fee	0.00%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%
Other Expenses	0.02%
Total Annual Fund Operating Expenses	0.02%

Example:

1 year	3 years	5 years	10 years
$2	$6	$11	$26

Portfolio Turnover:

Principal Investment Strategies

tion of the companies included in the Index ranged from $1.21 million to $122.09 billion. As of February 28, 2025, the Index comprised 2,457 securities. As of February 28, 2025, a significant portion of the Index comprised companies in the information technology, healthcare, industrials, financials and consumer discretionary sectors, although this may change from time to time.

The Portfolio generally intends to invest in all stocks comprising the Index in approximate proportion to their weightings in the Index. However, under various circumstances, it may not be possible or practicable to purchase all stocks in those weightings. In those circumstances, the Portfolio may purchase a sample of the stocks in the Index in proportions expected by SSGA Funds Management, Inc. (“SSGA FM” or the “Adviser”), the investment adviser to the Portfolio, to match generally the performance of the Index as a whole. In addition, from time to time, stocks are added to or removed from the Index. The Portfolio may sell securities that are represented in the Index, or purchase securities that are not yet represented in the Index, in anticipation of their removal from or addition to the Index. Under normal market conditions, the Portfolio invests at least 80% of its net assets (plus borrowings, if any) in stocks in the Index. The Portfolio will provide shareholders with at least sixty (60) days' notice prior to any change in this 80% investment policy. The notional value of the Portfolio's investments in derivatives or other synthetic instruments that provide exposures comparable, in the judgment of the Adviser, to investments in the Index may be counted toward satisfaction of this 80% policy. In addition, the Portfolio may invest in equity securities that are not included in the Index, cash and cash equivalents or money market instruments, such as repurchase agreements and money market funds (including money market funds advised by the Adviser).

The Portfolio may purchase or sell futures contracts on the Index, or options on those futures, in lieu of investing directly in the stocks making up the Index. The Portfolio might do so, for example, in order to increase its investment exposure pending investment of cash in the stocks comprising the Index. Alternatively, the Portfolio might use futures or options on futures to reduce its investment exposure in situations where it intends to sell a portion of the stocks in its portfolio but the sale has not yet been completed. The Portfolio may also enter into other derivatives transactions, including the use of options or swap transactions relating to the Index or any securities comprising the Index, in lieu of investing directly in the stocks making up the Index. The Portfolio may, to the extent permitted by applicable law, invest in shares of other mutual funds whose investment objectives and policies are similar to those of the Portfolio (including funds advised by the Adviser).

The Index is sponsored by FTSE Russell (the “Index Provider”), which is not affiliated with the Portfolio or the Adviser. The Index Provider determines the composition of the Index, relative weightings of the securities in the Index and publishes information regarding the market value of the Index.

Principal Risks of investing in the Portfolio

adversely affect global economies and markets. Local, regional or global events such as war, military conflicts, acts of terrorism, trade policy changes or disputes, the threat or actual imposition of tariffs, natural disasters, the spread of infectious illness or other public health issues, or other events could have a significant impact on the Portfolio and its investments.

Industrial Sector Risk: Stock prices for the types of companies included in this sector are affected by supply and demand both for their specific product or service and for industrial sector products in general. Government regulation, world events and economic conditions, technological developments and liabilities for environmental damage and general civil liabilities will likewise affect the performance of these companies. Aerospace and defense companies, a component of the industrial sector, can be significantly affected by government spending policies because companies involved in this industry rely to a significant extent on U.S. and foreign government demand for their products and services. Thus, the financial condition of, and investor interest in, aerospace and defense companies are heavily influenced by governmental defense spending policies which are typically under pressure from efforts to

control the U.S. (and other) government budgets. Transportation stocks, a component of the industrial sector, are cyclical and have occasional sharp price movements which may result from changes in the economy, fuel prices, labor agreements and insurance costs.

Derivatives Risk: Derivative transactions can create investment leverage and may have significant volatility. It is possible that a derivative transaction will result in a much greater loss than the principal amount invested, that changes in the value of a derivative transaction may not correlate perfectly with the underlying asset, and that the Portfolio may not be able to close out a derivative transaction at a favorable time or price. The counterparty to a derivatives contract may be unable or unwilling to make timely settlement payments, return the Portfolio's margin, or otherwise honor its obligations. A derivatives transaction may not behave in the manner anticipated by the Adviser or may not have the effect on the Portfolio anticipated by the Adviser.

rapidly or unexpectedly (collectively, such transactions are referred to as “large shareholder transactions”). Large shareholder transactions could adversely affect the ability of the Portfolio to conduct its investment program.

Valuation Risk: Certain portfolio holdings may be valued on the basis of factors other than market quotations. This may occur more often in times of market turmoil or reduced liquidity. There are multiple methods that can be used to value a portfolio holding when market quotations are not readily available. The value established for any portfolio holding at a point in time might differ from what would be produced using a different methodology or if it had been priced using market quotations. Portfolio holdings that are valued using techniques other than market quotations, including “fair valued” securities, may be subject to greater fluctuation in their valuations from one day to the next than if market quotations were used. In addition, there is no assurance that the Portfolio could sell or close out a portfolio position for the value established for it at any time, and it is possible that the Portfolio would incur a loss because a portfolio position is sold or closed out at a discount to the valuation established by the Portfolio at that time. Investors who purchase or redeem Portfolio Shares on days when the Portfolio is holding fair-valued investments may receive fewer or more shares or lower or higher redemption proceeds than they would have received if the Portfolio had not fair-valued the holding(s) or had used a different valuation methodology.

Performance

The bar chart and table below provide some indication of the risks of investing in the Portfolio by illustrating the variability of the Portfolio's returns from year-to-year and by showing how the Portfolio's average annual returns for the periods indicated compared with that of (i) a broad measure of market performance and (ii) the Index. The Portfolio's past performance does not necessarily indicate how the Portfolio will perform in the future. Current performance information for the Portfolio is available toll free by calling (800) 997-7327 or by visiting our website at www.ssga.com.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	30.52%	Q2 2020
Lowest Quarterly Return	-27.89%	Q1 2020

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Since Inception
	One Year	Five Years	8/11/2015
Return Before Taxes	17.20 %	10.27 %	9.99 %
Return After Taxes on Distributions	15.24 %	8.52 %	8.28 %
Return After Taxes on Distributions and Sale of Fund Shares	10.88 %	7.68 %	7.43 %
Russell Small Cap Completeness Index (reflects no deduction for fees, expenses or taxes)	17.14 %	10.27 %	9.99 %
S&P 500 Index (reflects no deduction for fees, expenses or taxes)	25.02 %	14.53 %	13.72 %

The Portfolio will make updated performance information, including its current net asset value, available at the Portfolio's website: www.ssga.com.

Investment Adviser

SSGA FM serves as the investment adviser to the Portfolio.

The professionals primarily responsible for the day-to-day management of the Portfolio are Karl Schneider and Ted Janowsky each of which has served as a portfolio manager of the Portfolio since inception in 2015.

Karl Schneider, CAIA, is a Managing Director of the Adviser and Co-Head of the Systematic Equity Group in the Americas. He joined the Adviser in 1997.

Ted Janowsky, CFA, is a Vice President of the Adviser and a Senior Portfolio Manager in the Systematic Equity Group. He joined the Adviser in 2005.

Purchase and Sale of Portfolio Shares

Generally, shares of the Portfolio may be purchased only by or on behalf of other registered investment companies or private clients that compensate the Adviser or its affiliates directly.

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

To establish an account	None
To add to an existing account	None

You may purchase or redeem Portfolio Shares on any day the Portfolio is open for business.

Written Requests and Wire Transfers. You may purchase or redeem Portfolio Shares by written request or wire transfer.

Written requests should be sent to:

By Mail:

State Street Corporation
Attention: Transfer Agent
Box 5493
Mail Code: OHD0100
North Quincy, MA 02171

By Overnight/Registered, Express, Certified Mail:

State Street Corporation
Attention: Transfer Agent
1 Heritage Drive
North Quincy, MA 02171

By Intermediary:

Financial Intermediaries may contact State Street Dealer Services Group at 617-662-7300 or email them at broker-dealerservices@statestreet.com with questions.

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

Additional Information About Investment Objectives, Principal Strategies and Risks

Investment Objective

The State Street Institutional Investment Trust's (the “Trust”) Board of Trustees (the “Board”) may change each Portfolio's investment strategies and other policies without shareholder approval, except as otherwise indicated. The Board may change each Portfolio's investment objective without shareholder approval.

State Street Aggregate Bond Index Portfolio

Principal Investment Strategies

Index Futures Contracts and Related Options. The Portfolio may buy and sell futures contracts and options on those futures contracts. An “index futures” contract is a contract to buy or sell units of an index at an agreed price on a specified future date. Depending on the change in value of the Index between the time when the Portfolio enters into and closes out an index future or option transaction, the Portfolio realizes a gain or loss. Options and futures transactions involve risks. For example, it is possible that changes in the prices of futures contracts will not correlate precisely with changes in the value of the Index. In those cases, use of futures contracts and related options might decrease the correlation between the return of the Portfolio and the return of the Index. In addition, the Portfolio incurs transaction costs in entering into, and closing out, positions in futures contracts and related options. Portfolios that enter into contracts with counterparties run the risk that the counterparty will be unwilling or unable to make timely settlement payments or otherwise honor its obligations. This risk is typically less for exchange-traded derivatives, such as those the Portfolio may invest in.

These costs typically have the effect of reducing the correlation between the return of the Portfolio and the return of the Index. Because the market for futures contracts and options may be illiquid, the Portfolio may have to hold a contract or option when the Adviser would otherwise have closed out the position, or it may only be able to close out at a price lower than what the Adviser believes is the fair value of the contract or option, thereby potentially reducing the return of the Portfolio.

Other Derivative Transactions. The Portfolio may enter into derivatives transactions involving options and swaps. These transactions involve many of the same risks as those described above under “Index Futures Contracts and Related Options.” In addition, since many of such transactions are conducted directly with counterparties, and not on an exchange or board of trade, the Portfolio's ability to realize any investment return on such transactions is generally subject to greater risk that the counterparty will be unable or unwilling to meet its obligations.

Additional Index Information. The components of the Index are reconstituted and rebalanced monthly.

State Street Equity 500 Index II Portfolio

Principal Investment Strategies

The Portfolio generally intends to invest in all stocks comprising the S&P 500 in approximate proportion to their weightings in the Index. However, under various circumstances, it may not be possible or practicable to purchase all stocks in those weightings. In those circumstances, the Portfolio may purchase a sample of the stocks in the Index in proportions expected by SSGA FM to match generally the performance of the Index as a whole. In addition, from time to time, stocks are added to or removed from the Index. The Portfolio may sell securities that are represented in the Index, or purchase securities that are not yet represented in the Index, in anticipation of their removal from or addition to the Index. Under normal circumstances, the Portfolio generally invests substantially all, but at least 80%, of its net assets (plus borrowings, if any) in securities comprising the Index or in securities that the Adviser determines have economic characteristics that are comparable to the economic characteristics of securities that comprise the Index. The notional value of the Portfolio's investments in derivatives or other synthetic instruments that provide exposures comparable, in the judgment of the Adviser, to investments in the Index may be counted toward satisfaction of this 80% policy. Shareholders will receive sixty (60) days' notice prior to a change in the 80% investment policy. In addition, the Portfolio may invest in equity securities that are not included in the Index, cash and cash equivalents or money market instruments, such as repurchase agreements and money market funds (including money market funds advised by the Adviser).

State Street Global All Cap Equity ex-U.S. Index Portfolio

Principal Investment Strategies

The Portfolio is an “index” fund that seeks to track, before fees and expenses, the total return performance of the MSCI ACWI ex USA Investable Market Index (the “MSCI ACWI ex USA IMI Index” or sometimes referred to in context as the “Index”) over the long term. As an “index” fund, the Portfolio is not managed according to traditional methods of “active” investment management, which involve the buying and selling of securities based upon economic, financial and market analysis and investment judgment. As of February 28, 2025, a significant portion of the Index comprised companies in the financials, industrials and information technology sectors, although this may change from time to time. As of February 28, 2025, a significant portion of the Index comprised companies located in Japan and the United Kingdom and a significant portion of the Index constituents are denominated in the Euro and Yen, although this may change from time to time.

In seeking to track the performance of the Index, the Portfolio employs a sampling strategy, which means that the Portfolio is not required to purchase all of the securities represented in the Index. Instead, the Portfolio may purchase a subset of the securities in the Index in an effort to hold a portfolio of securities with generally the same risk and return characteristics of the Index. The number of holdings in the Portfolio will be based on a number of factors, including asset size of the Portfolio. SSGA FM generally expects the Portfolio to hold fewer than the total number of securities in the Index, but reserves the right to hold as many securities as it believes necessary to achieve the Portfolio's investment objective.

Under normal circumstances, the Portfolio generally invests substantially all, but at least 80%, of its net assets (plus borrowings, if any) in securities comprising the Index or in American Depositary Receipts (“ADRs”) or Global Depositary Receipts (“GDRs”) providing exposure to securities comprising the Index. The notional value of the Portfolio's investments in derivatives or other synthetic instruments that provide exposures comparable, in the judgment of the Adviser, to investments in the Index may be counted toward satisfaction of this 80% policy. The Portfolio will provide shareholders with at least sixty (60) days' notice prior to any change in this 80% investment policy. In addition, the Portfolio may invest in equity securities that are not included in the Index, cash and cash equivalents or money market instruments, such as repurchase agreements and money market funds (including money market funds advised by the Adviser).

Indonesia, Ireland, Israel, Italy, Japan, Korea, Kuwait, Malaysia, Mexico, the Netherlands, New Zealand, Norway, Peru, Philippines, Poland, Portugal, Qatar, Saudi Arabia, Singapore, South Africa, Spain, Sweden, Switzerland, Taiwan, Thailand, Turkey, United Arab Emirates and the United Kingdom. It is not possible to invest directly in the Index.

State Street Small/Mid Cap Equity Index Portfolio

Principal Investment Strategies

The Portfolio uses a passive management strategy designed to track the performance of the Russell Small Cap Completeness Index (the “Index”). The Index is a float-adjusted, market capitalization index which measures the performance of the Russell 3000® Index companies excluding S&P 500® constituents. The Index is constructed to provide a comprehensive and unbiased barometer of the extended broad market beyond the S&P 500 exposure. The Index is completely reconstituted annually to ensure new and growing equities are included. As of February 28, 2025, the market capitalization of the companies included in the Index ranged from $1.21 million to $122.09 billion. As of February 28, 2025, the Index comprised 2,457 securities. As of February 28, 2025, a significant portion of the Index comprised companies in the information technology, healthcare, industrials, financials and consumer discretionary sectors, although this may change from time to time.

The Portfolio generally intends to invest in all stocks comprising the Index in approximate proportion to their weightings in the Index. However, under various circumstances, it may not be possible or practicable to purchase all stocks in those weightings. In those circumstances, the Portfolio may purchase a sample of the stocks in the Index in proportions expected by SSGA FM to match generally the performance of the Index as a whole. In addition, from time to time, stocks are added to or removed from the Index. The Portfolio may sell securities that are represented in the Index, or purchase securities that are not yet represented in the Index, in anticipation of their removal from or addition to the Index. Under normal market conditions, the Portfolio invests at least 80% of its net assets (plus borrowings, if any) in stocks in the Index. The Portfolio will provide shareholders with at least sixty (60) days' notice prior to any change in this 80% investment policy. The notional value of the Portfolio's investments in derivatives or other synthetic instruments that provide exposures comparable, in the judgment of the Adviser, to investments in the Index may be counted toward satisfaction of this 80% policy. In addition, the Portfolio may invest in equity securities that are not included in the Index, cash and cash equivalents or money market instruments, such as repurchase agreements and money market funds (including money market funds advised by the Adviser).

Additional Index Information. The Index's components are reconstituted annually and rebalanced monthly.

Additional Information About Risks

The Portfolios are subject to the following principal risks. The risks are described in alphabetical order and not in the order of importance or potential exposure. Each principal risk without a parenthetical indicating a single Portfolio's name is applicable to each Portfolio.

Call/Prepayment Risk (principal risk for the Aggregate Bond Index Portfolio). Call/prepayment risk is the risk that an issuer will exercise its right to pay principal on an obligation held by a Portfolio earlier than expected or required. This may occur, for example, when there is a decline in interest rates, and an issuer of bonds or preferred stock redeems the bonds or stock in order to replace them with obligations on which it is required to pay a lower interest or dividend rate. It may also occur when there is an unanticipated increase in the rate at which mortgages or other receivables underlying mortgage- or asset-backed securities held by a Portfolio are prepaid. In any such case, a Portfolio may be forced to invest the prepaid amounts in lower-yielding investments, resulting in a decline in the Portfolio's income.

Consumer Discretionary Sector Risk (principal risk for the Small/Mid Cap Equity Index Portfolio). The success of consumer product manufacturers and retailers is tied closely to the performance of the overall global economy, interest rates, competition and consumer confidence. Success depends heavily on disposable household income and consumer spending. Also, companies in the consumer discretionary sector may be subject to severe competition, which may have an adverse impact on their respective profitability. Changes in demographics and consumer tastes can also affect the demand for, and success of, consumer products and services in the marketplace.

Counterparty Risk. A Portfolio will be subject to credit risk with respect to the counterparties with which the Portfolio enters into derivatives contracts and other transactions such as repurchase agreements or reverse repurchase agreements. A Portfolio's ability to profit from these types of investments and transactions will depend on the willingness and ability of its counterparty to perform its obligations. If a counterparty fails to meet its contractual obligations, a Portfolio may be unable to terminate or realize any gain on the investment or transaction, resulting in a loss to the Portfolio. A Portfolio may experience significant delays in obtaining any recovery in an insolvency, bankruptcy, or other reorganization proceeding involving its counterparty (including recovery of any collateral posted by it) and may obtain only a limited recovery or may obtain no recovery in such circumstances. If a Portfolio holds collateral posted by its counterparty, it may be delayed or prevented from realizing on the collateral in the event of a bankruptcy or insolvency proceeding relating to the counterparty. Under applicable law or contractual provisions, including if a Portfolio enters into an investment or transaction with a financial institution and such financial institution (or an affiliate of the financial institution) experiences financial difficulties, then the Portfolio may in certain situations be prevented or delayed from exercising its rights to terminate the investment or transaction, or to realize on any collateral and may result in the suspension of payment and delivery obligations of the parties under such investment or transactions or in another institution being substituted for that financial institution without the consent of the Portfolio. Further, a Portfolio may be subject to “bail-in” risk under applicable law whereby, if required by the financial institution's authority, the financial institution's liabilities could be written down, eliminated or converted into equity or an alternative instrument of ownership. A bail-in of a financial institution may result in a reduction in value of some or all of its securities and, if a Portfolio holds such securities or has entered into a transaction with such a financial security when a bail-in occurs, such Portfolio may also be similarly impacted.

Credit Risk (principal risk for the Aggregate Bond Index Portfolio). Credit risk is the risk that an issuer, guarantor or liquidity provider of a fixed-income security held by a Portfolio may be unable or unwilling, or may be perceived (whether by market participants, ratings agencies, pricing services or otherwise) as unable or unwilling, to make timely principal and/or interest payments, or to otherwise honor its obligations. It includes the risk that the security will be downgraded by a credit rating agency; generally, lower credit quality issuers present higher credit risks. An actual or perceived decline in creditworthiness of an issuer of a fixed-income security held by a Portfolio may result in a decrease in the value of the security. It is possible that the ability of an issuer to meet its obligations will decline substantially during the period when a Portfolio owns securities of the issuer or that the issuer will default on its obligations or that the obligations of the issuer will be limited or restructured.

its rating is downgraded, the Portfolio may nonetheless continue to hold the security in the discretion of the Adviser. In the case of asset-backed or mortgage-related securities, changes in the actual or perceived ability of the obligors on the underlying assets or mortgages to make payments of interest and/or principal may affect the values of those securities.

Currency Risk (principal risk for the Global All Cap Equity ex-U.S. Index Portfolio). Investments in issuers in different countries are often denominated in currencies other than the U.S. dollar. Changes in the values of those currencies relative to the U.S. dollar may have a positive or negative effect on the values of a Portfolio's investments denominated in those currencies. The values of other currencies relative to the U.S. dollar may fluctuate in response to, among other factors, interest rate changes, intervention (or failure to intervene) by national governments, central banks, or supranational entities such as the International Monetary Fund, the imposition of currency controls, and other political or regulatory developments. Currency values can decrease significantly both in the short term and over the long term in response to these and other developments. Continuing uncertainty as to the status of the Euro and the EMU has created significant volatility in currency and financial markets generally. Any partial or complete dissolution of the EMU, or any continued uncertainty as to its status, could have significant adverse effects on currency and financial markets, and on the values of a Portfolio's portfolio investments.

Debt Securities Risk (principal risk for the Aggregate Bond Index Portfolio). The values of debt securities may increase or decrease as a result of the following: market fluctuations, changes in interest rates, actual or perceived inability or unwillingness of issuers, guarantors or liquidity providers to make scheduled principal or interest payments or illiquidity in debt securities markets. To the extent that interest rates rise, certain underlying obligations may be paid off substantially slower than originally anticipated and the value of those securities may fall sharply. A rising interest rate environment may cause the value of a Portfolio's fixed income securities to decrease, an adverse impact on the liquidity of a Portfolio's fixed income securities, and increased volatility of the fixed income markets. During periods when interest rates are at low levels, a Portfolio's yield can be low, and a Portfolio may have a negative yield (i.e., it may lose money on an operating basis). To the extent that interest rates fall, certain underlying obligations may be paid off substantially faster than originally anticipated. If the principal on a debt obligation is prepaid before expected, the prepayments of principal may have to be reinvested in obligations paying interest at lower rates. During periods of falling interest rates, the income received by a Portfolio may decline. Changes in interest rates will likely have a greater effect on the values of debt securities of longer durations. Returns on investments in debt securities could trail the returns on other investment options, including investments in equity securities. High levels of inflation and/or a significantly changing interest rate environment can lead to heightened levels of volatility and reduced liquidity.

Depositary Receipts Risk (principal risk for the Global All Cap Equity ex-U.S. Index Portfolio). American Depositary Receipts (“ADRs”) are typically trust receipts issued by a U.S. bank or trust company that evidence an indirect interest in underlying securities issued by a foreign entity. Global Depositary Receipts (“GDRs”), European Depositary Receipts (“EDRs”), and other types of depositary receipts are typically issued by non-U.S. banks or financial institutions to evidence an interest in underlying securities issued by either a U.S. or a non-U.S. entity. Investments in non-U.S. issuers through ADRs, GDRs, EDRs, and other types of depositary receipts generally involve risks applicable to other types of investments in non-U.S. issuers. Investments in depositary receipts may be less liquid and more volatile than the underlying securities in their primary trading market. If a depositary receipt is denominated in a different currency than its underlying securities, a Portfolio will be subject to the currency risk of both the investment in the depositary receipt and the underlying security. There may be less publicly available information regarding the issuer of the securities underlying a depositary receipt than if those securities were traded directly in U.S. securities markets. Depositary receipts may or may not be sponsored by the issuers of the underlying securities, and information regarding issuers of securities underlying unsponsored depositary receipts may be more limited than for sponsored depositary receipts. The values of depositary receipts may decline for a number of reasons relating to the issuers or sponsors of the depositary receipts, including, but not limited to, insolvency of the issuer or sponsor. Holders of depositary receipts may have limited or no rights to take action with respect to the underlying securities or to compel the issuer of the receipts to take action. The prices of depositary receipts may differ from the prices of securities upon which they are based. To the extent the Portfolio invests in depositary receipts based on securities included in the Index, such differences in prices may increase index tracking risk.

the counterparty's credit quality; the potential for the derivative transaction not to have the effect the Adviser anticipated or a different or less favorable effect than the Adviser anticipated; the failure of the counterparty to the derivative transaction to perform its obligations under the transaction or to settle a trade; possible mispricing or improper valuation of the derivative instrument; imperfect correlation in the value of a derivative with the asset, rate, or index underlying the derivative; the risk that a Portfolio may be required to post collateral or margin with its counterparty, and will not be able to recover the collateral or margin in the event of the counterparty's insolvency or bankruptcy; the risk that a Portfolio will experience losses on its derivatives investments and on its other portfolio investments, even when the derivatives investments may be intended in part or entirely to hedge those portfolio investments; the risks specific to the asset underlying the derivative instrument; lack of liquidity for the derivative instrument, including, without limitation, absence of a secondary trading market; the potential for reduced returns to a Portfolio due to losses on the transaction and an increase in volatility; the potential for the derivative transaction to have the effect of accelerating the recognition of gain; and legal risks arising from the documentation relating to the derivative transaction.

Emerging Markets Risk (principal risk for the Global All Cap Equity ex-U.S. Index Portfolio). Investments in emerging markets are generally subject to a greater risk of loss than investments in developed markets. This may be due to, among other things, the possibility of greater market volatility, lower trading volume and liquidity, greater risk of expropriation, nationalization, and social, political and economic instability, greater reliance on a few industries, international trade or revenue from particular commodities, less developed accounting, legal and regulatory systems, increased potential for market manipulation, higher levels of inflation, deflation or currency devaluation, greater risk of market shutdown, and more significant governmental limitations on investment policy as compared to those typically found in a developed market. The Public Company Accounting Oversight Board, which regulates auditors of U.S. public companies, is unable to inspect audit work papers in certain foreign countries. Investors in foreign countries often have limited rights and few practical remedies to pursue shareholder claims, including class actions or fraud claims, and the ability of the U.S. Securities and Exchange Commission, the U.S. Department of Justice and other authorities to bring and enforce actions against foreign issuers or foreign persons is limited. In addition, issuers (including governments) in emerging market countries may have less financial stability than in other countries. The securities of emerging market companies may trade less frequently and in smaller volumes than more widely held securities. Market disruptions or substantial market corrections may limit very significantly the liquidity of securities of certain companies in a particular country or geographic region, or of all companies in the country or region. A Portfolio may be unable to liquidate its positions in such securities at any time, or at a favorable price, in order to meet the Portfolio's obligations. There is also the potential for unfavorable action such as embargoes and acts of war. As a result, there will tend to be an increased risk of price volatility in investments in emerging market countries, which may be magnified by currency fluctuations relative to the U.S. dollar. Settlement and asset custody practices for transactions in emerging markets may differ from those in developed markets. Such differences may include possible delays in settlement and certain settlement practices, such as delivery of securities prior to receipt of payment, which increase the likelihood of a “failed settlement.” Failed settlements can result in losses. For these and other reasons, investments in emerging markets are often considered speculative.

Equity Investing Risk (principal risk for the Equity 500 Index II Portfolio, Global All Cap Equity ex-U.S. Index Portfolio and Small/Mid Cap Equity Index Portfolio). The market prices of equity securities owned by a Portfolio may go up or down, sometimes rapidly or unpredictably. The value of a security may decline for a number of reasons that may directly relate to the issuer, such as management performance, financial leverage, non-compliance with regulatory requirements, and reduced demand for the issuer's goods or services. The values of equity securities also may decline due to general industry or market conditions that are not specifically related to a particular company, such as real or perceived adverse economic conditions, changes in the general outlook for corporate earnings, changes in interest or currency rates, or adverse investor sentiment generally. In addition, equity markets tend to move in cycles, which may cause stock prices to fall over short or extended periods of time.

Extension Risk (principal risk for the Aggregate Bond Index Portfolio). During periods of rising interest rates, the average life of certain types of securities may be extended because of slower-than-expected principal payments. This may increase the period of time during which an investment earns a below-market interest rate, increase the security's duration and reduce the value of the security. Extension risk may be heightened during periods of adverse economic conditions generally, as payment rates decline due to higher unemployment levels and other factors.

Financial Sector Risk (principal risk for the Equity 500 Index II Portfolio, Global All Cap Equity ex-U.S. Index Portfolio and Small/Mid Cap Equity Index Portfolio). Financial services companies are subject to extensive governmental regulation, which may limit both the amounts and types of loans and other financial commitments they can make, the interest rates and fees they can charge, the scope of their activities, the prices they can charge and the amount of capital they must

maintain. Profitability is largely dependent on the availability and cost of capital funds and can fluctuate significantly when interest rates change or due to increased competition. In addition, deterioration of the credit markets generally may cause an adverse impact in a broad range of markets, including U.S. and international credit and interbank money markets generally, thereby affecting a wide range of financial institutions and markets. Certain events in the financial sector may cause an unusually high degree of volatility in the financial markets, both domestic and foreign, and cause certain financial services companies to incur large losses. Securities of financial services companies may experience a dramatic decline in value when such companies experience substantial declines in the valuations of their assets, take action to raise capital (such as the issuance of debt or equity securities), or cease operations. Credit losses resulting from financial difficulties of borrowers and financial losses associated with investment activities can negatively impact the sector. Insurance companies may be subject to severe price competition. Adverse economic, business or political developments could adversely affect financial institutions engaged in mortgage finance or other lending or investing activities directly or indirectly connected to the value of real estate.

Geographic Focus Risk (principal risk for the Global All Cap Equity ex-U.S. Index Portfolio). The performance of a fund that invests significantly in one or more countries or geographic regions will be closely tied to market, currency, economic, political, environmental, or regulatory conditions and developments in the countries or regions in which the fund invests, and may be more volatile than the performance of a fund that does not invest significantly in such countries or regions.

Responses to the financial problems by European governments, central banks and others, including austerity measures and reforms, may not produce the desired results, may result in social unrest and may limit future growth and economic recovery or have other unintended consequences. Further defaults or restructurings by governments and other entities of their debt could have additional adverse effects on economies, financial markets and asset valuations around the world. In addition, one or more countries may abandon the euro and/or withdraw from the EU. On January 31, 2020, the United Kingdom (“UK”) formally withdrew from the European Union (“EU”) (commonly known as “Brexit”). An agreement between the UK and the EU governing their future trade relationship became effective January 1, 2021, but that agreement does not include an agreement on financial services, and it is unlikely that such agreement will be concluded. Moreover, the UK government has started a program of financial services law reform with the ultimate aim of repealing many EU financial services laws that were assimilated into UK law from January 1, 2021, and replacing them with legislation or rules made by the UK government or financial services regulators. Accordingly, uncertainty remains in certain areas as to the future relationship between the UK and the EU. Brexit has already had a significant impact on the UK, Europe, and global economies, and could continue to result in volatility and illiquidity, legal, political, economic and regulatory uncertainties and lower economic growth for these economies that could in turn have an adverse effect on the value of the Portfolio's investments. Any further exits from the EU, or the possibility of such exits, or the abandonment of the euro, may cause additional market disruption globally and introduce new legal and regulatory uncertainties. In addition, a number of countries in Europe have suffered terrorist attacks and additional attacks may occur in the future. Such attacks may cause uncertainty in financial markets and may adversely affect the performance of the issuers to which the Portfolio has exposure.

other concerns, including a financial system with large levels of nonperforming loans, over-leveraged corporate balance sheets, extensive cross-ownership by major corporations, a changing corporate governance structure, and large government deficits. These issues may cause a slowdown of the Japanese economy. The Japanese yen has fluctuated widely at times and any increase in its value may cause a decline in exports that could weaken the Japanese economy. Japan has, in the past, intervened in the currency markets to attempt to maintain or reduce the value of the yen. Japanese intervention in the currency markets could cause the value of the yen to fluctuate sharply and unpredictably and could cause losses to investors. Japan has an aging workforce and has experienced a significant population decline in recent years. Japan's labor market appears to be undergoing fundamental structural changes, as a labor market traditionally accustomed to lifetime employment adjusts to meet the need for increased labor mobility, which may adversely affect Japan's economic competitiveness.

Healthcare Sector Risk (principal risk for the Equity 500 Index II Portfolio and Small/Mid Cap Equity Index Portfolio). Companies in the healthcare sector are subject to extensive government regulation and their profitability can be significantly affected by restrictions on government reimbursement for medical expenses, rising costs of medical products and services, pricing pressure (including price discounting), limited product lines and an increased emphasis on the delivery of healthcare through outpatient services. Companies in the healthcare sector are heavily dependent on obtaining and defending patents, which may be time consuming and costly, and the expiration of patents may also adversely affect the profitability of these companies. Healthcare companies are also subject to extensive litigation based on product liability and similar claims. In addition, their products can become obsolete due to industry innovation, changes in technologies or other market developments. Many new products in the healthcare sector require significant research and development and may be subject to regulatory approvals, all of which may be time consuming and costly with no guarantee that any product will come to market.

Income Risk (principal risk for the Aggregate Bond Index Portfolio). A Portfolio's income may decline due to falling interest rates or other factors. Issuers of securities held by a Portfolio may call or redeem the securities during periods of falling interest rates, and the Portfolio would likely be required to reinvest in securities paying lower interest rates. If an obligation held by a Portfolio is prepaid, the Portfolio may have to reinvest the prepayment in other obligations paying income at lower rates. A reduction in the income earned by a Portfolio may limit the Portfolio's ability to achieve its objective.

Indexing Strategy/Index Tracking Risk. Each Portfolio is managed with an indexing investment strategy, attempting to track the performance of an unmanaged index of securities. Each Portfolio will seek to replicate Index returns, regardless of the current or projected performance of the Index or of the actual securities comprising the Index. This differs from an actively-managed fund, which typically seeks to outperform a benchmark index. Each Portfolio generally will buy and will not sell a security included in the Index as long as the security is part of the Index regardless of any sudden or material decline in value or foreseeable material decline in value of the security, even though the Adviser may make a different investment decision for other actively managed accounts or portfolios that hold the security. As a result, a Portfolio's performance may be less favorable than that of a portfolio managed using an active investment strategy. The structure and composition of the Index will affect the performance, volatility, and risk of the Index (in absolute terms and by comparison with other indices) and, consequently, the performance, volatility, and risk of a Portfolio. Errors in index data, index computations or the construction of the Index in accordance with its methodology may occur from time to time and may not be identified and corrected by the Index Provider for a period of time or at all, which may have an adverse impact on a Portfolio and its shareholders. While the Adviser seeks to track the performance of the Index (i.e., achieve a high degree of correlation with the Index), a Portfolio's return may not match the return of the Index for a number of reasons. For example, the return on the sample of securities purchased by a Portfolio (or the return on securities not included in the Index) to replicate the performance of the Index may not correlate precisely with the return of the Index. Each Portfolio incurs a number of operating expenses not applicable to the Index, and incurs costs in buying and

selling securities. In addition, a Portfolio may not be fully invested at times, either as a result of cash flows into or out of the Portfolio or reserves of cash held by the Portfolio to meet redemptions. The Adviser may attempt to track the Index return by investing in fewer than all of the securities in the Index, or in some securities not included in the Index, potentially increasing the risk of divergence between a Portfolio's return and that of the Index. Changes in the composition of the Index and regulatory requirements also may impact a Portfolio's ability to match the return of the Index. The Adviser may apply one or more “screens” or investment techniques to refine or limit the number or types of issuers included in the Index in which a Portfolio may invest. Application of such screens or techniques may result in investment performance below that of the Index and may not produce results expected by the Adviser. Index tracking risk may be heightened during times of increased market volatility or other unusual market conditions.

Industrial Sector Risk (principal risk for the Global All Cap Equity ex-U.S. Index Portfolio and Small/Mid Cap Equity Index Portfolio). Industrial companies are affected by supply and demand both for their specific product or service and for industrial sector products and services in general. Government regulation, world events, exchange rates and economic conditions, technological developments and liabilities for environmental damage and general civil liabilities will likewise affect the performance of these companies. Aerospace and defense companies, a component of the industrial sector, can be significantly affected by government spending policies because companies involved in this industry rely, to a significant extent, on U.S. and foreign government demand for their products and services. Thus, the financial condition of, and investor interest in, aerospace and defense companies are heavily influenced by governmental defense spending policies which are typically under pressure from efforts to control the U.S. (and other) government budgets. Transportation securities, another component of the industrial sector, are cyclical and have occasional sharp price movements which may result from changes in the economy, fuel prices, labor agreements and insurance costs.

Inflation Risk (principal risk for the Aggregate Bond Index Portfolio). Inflation risk is the risk that the value of assets or income from investments will be less in the future as inflation decreases the value of money. As inflation increases, the values of a Portfolio's assets can decline. Inflation rates may change frequently and drastically as a result of various factors, including unexpected shifts in the domestic or global economy (or expectations that domestic or global economic policies will change), and the Portfolio's investments may not keep pace with inflation, which may result in losses to Portfolio investors or adversely affect the real value of shareholders' investments in the Portfolio. As such, fixed income securities markets may experience heightened levels of interest rate volatility and liquidity risk.

Information Technology Sector Risk (principal risk for the Equity 500 Index II Portfolio, Global All Cap Equity ex-U.S. Equity Index Portfolio and Small/Mid Cap Equity Index Portfolio). Market or economic factors impacting information technology companies could have a major effect on the value of the Portfolio's investments. The value of stocks of information technology companies is particularly vulnerable to rapid changes in technology product cycles, rapid product obsolescence, government regulation and competition, both domestically and internationally, including competition from foreign competitors with lower production costs. Like other technology companies, information technology companies may have limited product lines, markets, financial resources or personnel. Stocks of technology companies and companies that rely heavily on technology, especially those of smaller, less-seasoned companies, tend to be more volatile than the overall market. Information technology companies are heavily dependent on patent and intellectual property rights, the loss or impairment of which may adversely affect profitability. Additionally, companies in the information technology sector may face dramatic and often unpredictable changes in growth rates and competition for the services of qualified personnel.

Interest Rate Risk (principal risk for the Aggregate Bond Index Portfolio). Interest rate risk is the risk that the securities held by a Portfolio will decline in value because of increases in market interest rates. Duration is a measure used to determine the sensitivity of a security's price to changes in interest rates. Debt securities with longer durations tend to be more sensitive to changes in interest rates, usually making them more volatile than debt securities with shorter durations. For example, the value of a security with a duration of five years would be expected to decrease by 5% for every 1% increase in interest rates. Falling interest rates also create the potential for a decline in a Portfolio's income and yield. Interest-only and principal-only securities are especially sensitive to interest rate changes, which can affect not only their prices but can also change the income flows and repayment assumptions about those investments. Variable and floating rate securities also generally increase or decrease in value in response to changes in interest rates, although generally to a lesser degree than fixed-rate securities. A substantial increase in interest rates may also have an adverse impact on the liquidity of a security, especially those with longer durations. Changes in governmental policy, including changes in central bank monetary policy, could cause interest rates to rise rapidly, or cause investors to expect a rapid

rise in interest rates. This could lead to heightened levels of interest rate, volatility and liquidity risks for the fixed income markets generally and could have a substantial and immediate effect on the values of a Portfolio's investments. High levels of inflation and/or a significantly changing interest rate environment can lead to heightened levels of volatility and reduced liquidity.

Large-Capitalization Securities Risk (principal risk for the Equity 500 Index II Portfolio and Global All Cap Equity ex-U.S. Portfolio). Securities issued by large-capitalization companies may present risks not present in smaller companies. For example, larger companies may be unable to respond as quickly as smaller and mid-sized companies to competitive challenges or to changes in business, product, financial, or other market conditions. Larger companies may not be able to maintain growth at the high rates that may be achieved by well-managed smaller and mid-sized companies, especially during strong economic periods. Returns on investments in securities of large companies could trail the returns on investments in securities of smaller and mid-sized companies.

Large Transactions Risk. To the extent a large proportion of the shares of a Portfolio are highly concentrated or held by a small number of shareholders (or a single shareholder), including funds or accounts over which the Adviser has investment discretion, a Portfolio is subject to the risk that these shareholders will purchase or redeem Portfolio Shares in large amounts rapidly or unexpectedly, including as a result of an asset allocation decision made by the Adviser. In addition, a large number of shareholders collectively may purchase or redeem Portfolio Shares in large amounts rapidly or unexpectedly (collectively, such transactions are referred to as “large shareholder transactions”). Large shareholder transactions could adversely affect the ability of a Portfolio to conduct its investment program. For example, they could require a Portfolio to sell portfolio securities or purchase portfolio securities unexpectedly and incur substantial transaction costs and/or accelerate the realization of taxable income and/or gains to shareholders. The effects of taxable income and/or gains resulting from large shareholder transactions would particularly impact non-redeeming shareholders who do not hold their Portfolio Shares in an IRA, 401(k) plan or other tax-advantaged plan. To the extent that such transactions result in short-term capital gains, such gains will generally be taxed at the ordinary income tax rate for shareholders who hold Portfolio Shares in a taxable account. In addition, a Portfolio may be required to sell its more liquid portfolio investments to meet a large redemption, in which case a Portfolio's remaining assets may be less liquid, more volatile, and more difficult to price. A Portfolio may hold a relatively large proportion of its assets in cash in anticipation of large redemptions, diluting its investment returns. A number of circumstances may cause a Portfolio to experience large redemptions, such as changes in investors' circumstances; changes in the eligibility criteria for a Portfolio or share class of the Portfolio; liquidations, reorganizations, repositionings, or other announced Portfolio events; or changes in investment objectives, strategies, policies, risks, or investment personnel.

Leveraging Risk. Borrowing transactions, reverse repurchase agreements, certain derivatives transactions, securities lending transactions and other investment transactions such as when-issued, delayed-delivery, or forward commitment transactions may create investment leverage. If a Portfolio engages in transactions that have a leveraging effect on the Portfolio's investment portfolio, the value of the Portfolio will be potentially more volatile and all other risks will tend to be compounded. This is because leverage generally creates investment risk with respect to a larger base of assets than a Portfolio would otherwise have and so magnifies the effect of any increase or decrease in the value of the Portfolio's underlying assets. The use of leverage is considered to be a speculative investment practice and may result in losses to a Portfolio. Certain derivatives have the potential for unlimited loss, regardless of the size of the initial investment. The use of leverage may cause a Portfolio to liquidate positions when it may not be advantageous to do so to satisfy repayment, interest payment, or margin obligations.

Liquidity Risk. Liquidity risk is the risk that a Portfolio may not be able to dispose of investments readily at a favorable time or prices (or at all) or at prices approximating those at which a Portfolio currently values them. For example, certain investments may be subject to restrictions on resale, may trade in the over-the-counter market or in limited volume, or may not have an active trading market. Illiquid investments may trade at a discount from comparable, more liquid investments and may be subject to wide fluctuations in market value. It may be difficult for a Portfolio to value illiquid investments accurately. The market for certain investments may become illiquid under adverse market or economic conditions independent of any specific adverse changes in the conditions of a particular issuer. Disposal of illiquid investments may entail registration expenses and other transaction costs that are higher than those for liquid investments. A Portfolio may seek to borrow money to meet its obligations (including among other things redemption obligations) if it is unable to dispose of illiquid investments, resulting in borrowing expenses and possible leveraging of the Portfolio. In some cases, due to unanticipated levels of illiquidity a Portfolio may choose to meet its redemption obligations wholly or in part by distributions of assets in-kind.

The term “illiquid investments” for this purpose means investments that a Portfolio reasonably expects cannot be sold or disposed of in current market conditions in seven calendar days or less without the sale or disposition significantly changing the market value of the investments. If any Portfolio determines at any time that it owns illiquid investments in excess of 15% of its net assets, it will cease to undertake new commitments to acquire illiquid investments until its holdings are no longer in excess of 15% of its NAV, report the occurrence in compliance with Rule 30b1-10 under the 1940 Act and, depending on circumstances, may take additional steps to reduce its holdings of illiquid investments. The U.S. Securities and Exchange Commission (“SEC”) has recently proposed rule amendments that, if adopted as proposed, could result in a larger percentage of the Portfolio's investments being classified as illiquid investments.

Market Disruption and Geopolitical Risk. A Portfolio is subject to the risk that geopolitical events will disrupt securities markets and adversely affect global economies and markets. War, terrorism, and related geopolitical events have led, and in the future may lead, to increased short-term market volatility and may have adverse long-term effects on U.S. and world economies and markets generally. Likewise, trade policy changes or disputes, natural and environmental disasters, pandemics and epidemics, and systemic market dislocations may be highly disruptive to economies and markets. Those events, as well as other changes in foreign and domestic economic and political conditions, also could adversely affect individual issuers or related groups of issuers, securities markets, interest rates, credit ratings, inflation, investor sentiment, and other factors affecting the value of a Portfolio's investments. Given the increasing interdependence among global economies and markets, conditions in one country, market, or region might adversely affect markets, issuers, and/or foreign exchange rates in other countries, including the U.S. Any partial or complete dissolution of the EMU, or any increased uncertainty as to its status, could have significant adverse effects on currency and financial markets, and on the values of a Portfolio's investments. On January 31, 2020, the United Kingdom (“UK”) formally withdrew from the European Union (“EU”) (commonly known as “Brexit”). An agreement between the UK and the EU governing their future trade relationship became effective January 1, 2021, but that agreement does not include an agreement on financial services, and it is unlikely that such agreement will be concluded. Moreover, the UK government has started a program of financial services law reform with the ultimate aim of repealing many EU financial services laws that were assimilated into UK law from January 1, 2021, and replacing them with legislation or rules made by the UK government or financial services regulators. Accordingly, uncertainty remains in certain areas as to the future relationship between the UK and the EU. Brexit has already had a significant impact on the UK, Europe, and global economies, and could continue to result in volatility and illiquidity, legal, political, economic and regulatory uncertainties and lower economic growth for these economies that could in turn have an adverse effect on the value of the Portfolio's investments. Any further exits from the EU, or the possibility of such exits, or the abandonment of the euro, may cause additional market disruption globally and introduce new legal and regulatory uncertainties.

Securities and financial markets may be susceptible to market manipulation or other fraudulent trade practices, which could disrupt the orderly functioning of these markets or adversely affect the values of investments traded in these markets, including investments held by a Portfolio. To the extent a Portfolio has focused its investments in the market or index of a particular region, adverse geopolitical and other events could have a disproportionate impact on the Portfolio.

Market Risk. Market prices of investments held by a Portfolio will go up or down, sometimes rapidly or unpredictably. A Portfolio's investments are subject to changes in general economic conditions, general market fluctuations and the risks inherent in investment in securities markets. Investment markets can be volatile, and prices of investments can change substantially due to various factors, including, but not limited to, economic growth or recession, changes in interest rates, inflation, changes in actual or perceived creditworthiness of issuers and general market liquidity. Even if general economic conditions do not change, the value of an investment in a Portfolio could decline if the particular industries, sectors or companies in which the Portfolio invests do not perform well or are adversely affected by events. Further, legal, political, regulatory and tax changes also may cause fluctuations in markets and securities prices. Local, regional or global events such as war, military conflicts, acts of terrorism, trade policy changes or disputes, the threat of or actual imposition of tariffs, natural disasters, public health issues, or other events could have a significant impact on a Portfolio and its investments. Due to the interconnectedness of economies and financial markets throughout the world, if a Portfolio invests in securities of issuers located in or with significant exposure to countries experiencing economic and financial difficulties, the value and liquidity of the Portfolio's investments may be negatively affected. A widespread outbreak of an infectious illness and efforts to contain its spread, may result in market volatility, inflation, reduced liquidity of certain instruments, disruption in the trading of certain instruments, and systemic economic weakness. The foregoing could impact a Portfolio and its investments and result in disruptions to the services provided to a Portfolio by its service providers.

Market Volatility; Government Intervention Risk. Market dislocations and other external events, such as the failures or near failures of significant financial institutions, dislocations in investment or currency markets, corporate or governmental defaults or credit downgrades, or poor collateral performance, may subject a Portfolio to significant risk of substantial volatility and loss. Governmental and regulatory authorities have taken, and may in the future take, actions to provide or arrange credit supports to financial institutions whose operations have been compromised by credit market dislocations and to restore liquidity and stability to financial systems in their jurisdictions; the implementation of such governmental interventions and their impact on both the markets generally and a Portfolio's investment program in particular can be uncertain. Governmental and non-governmental issuers may default on, or be forced to restructure, their debts, and other issuers may face difficulties obtaining credit. Defaults or restructurings by governments or others of their debts could have substantial adverse effects on economies, financial markets, and asset valuations around the world. Federal Reserve or other U.S. or non-U.S. governmental or central bank actions, including interest rate increases or contrary actions by different governments, or investor perception that these efforts are not succeeding, could negatively affect financial markets generally as well as the values and liquidity of certain securities.

Mortgage-Related and Other Asset-Backed Securities Risk (principal risk for the Aggregate Bond Index Portfolio). Investments in mortgage-related and other asset-backed securities are subject to the risk of significant credit downgrades, illiquidity, and defaults to a greater extent than many other types of fixed income investments. The liquidity of mortgage-related and asset-backed securities may change over time. Mortgage-related securities represent a participation in, or are secured by, mortgage loans. Other asset-backed securities are typically structured like mortgage-related securities, but instead of mortgage loans or interests in mortgage loans, the underlying assets may include, for example, items such as motor vehicle installment sales or installment loan contracts, leases on various types of real and personal property, and receivables from credit card agreements. During periods of falling interest rates, mortgage-related and other asset-backed securities, which typically provide the issuer with the right to prepay the security prior to maturity, may be prepaid, which may result in a Portfolio having to reinvest the proceeds in other investments at lower interest rates. During periods of rising interest rates, the average life of mortgage-related and other asset-backed securities may extend because of slower-than expected principal payments. This may lock in a below market interest rate, increase the security's duration and interest rate sensitivity, and reduce the value of the security. As a result, mortgage-related and other asset-backed securities may have less potential for capital appreciation during periods of declining interest rates than other debt securities of comparable maturities, although they may have a similar risk of decline in market values during periods of rising interest rates. Prepayment rates are difficult to predict and the potential impact of prepayments on the value of a mortgage-related or other asset-backed security depends on the terms of the instrument and can result in significant volatility. The price of a mortgage-related or other asset-backed security also depends on the credit quality and adequacy of the underlying assets or collateral. Mortgage-related or other asset-backed securities issued by non-governmental issuers (such as commercial banks, savings and loan institutions, private mortgage insurance companies, mortgage bankers and other secondary market issuers) will generally entail greater credit risk than obligations guaranteed by the U.S. government. Defaults on the underlying assets, if any, may impair the value of a mortgage-related or other asset-backed security. For some asset-backed securities in which a Portfolio invests, such as those backed by credit card receivables, the underlying cash flows may not be supported by a security interest in a related asset. Moreover, the values of mortgage-related and other asset-backed securities may be substantially dependent on the servicing of the underlying asset pools, and are therefore subject to risks associated with the negligence or malfeasance by their servicers and to the credit risk of their servicers. In certain situations, the mishandling of related documentation may also affect the rights of securities holders in and to the underlying collateral. There may be legal and practical limitations on the enforceability of any security interest granted with respect to underlying assets, or the value of the underlying assets, if any, may be insufficient if the issuer defaults.

In a “forward roll” transaction, a Portfolio will sell a mortgage-related security to a bank or other permitted entity and simultaneously agree to purchase a similar security from the institution at a later date at an agreed upon price. The mortgage securities that are purchased will bear the same interest rate as those sold, but generally will be collateralized by different pools of mortgages with different prepayment histories than those sold. The values of such transactions will be affected by many of the same factors that affect the values of mortgage-related securities generally. In addition, forward roll transactions may have the effect of creating investment leverage in a Portfolio.

Non-U.S. Securities Risk (principal risk for the Global All Cap Equity ex-U.S. Index Portfolio). Investments in securities of non-U.S. issuers (including depositary receipts) entail risks not typically associated with investing in securities of U.S. issuers. Similar risks may apply to securities traded on a U.S. securities exchange that are issued by entities with significant exposure to non-U.S. countries. In certain countries, legal remedies available to investors may be more limited than those available with regard to U.S. investments. Because non-U.S. securities are typically denominated and traded in

currencies other than the U.S. dollar, the value of the Portfolio's assets, to the extent they are non-U.S. dollar denominated, may be affected favorably or unfavorably by currency exchange rates, exchange control regulations, and restrictions or prohibitions on the repatriation of non-U.S. currencies. Income and gains with respect to investments in certain countries may be subject to withholding and other taxes. There may be less information publicly available about a non-U.S. entity than about a U.S. entity, and many non-U.S. entities are not subject to accounting, auditing, and financial reporting standards, regulatory framework and practices comparable to those in the United States. The securities of some non-U.S. entities are less liquid and at times more volatile than securities of comparable U.S. entities, and could become subject to sanctions or embargoes that adversely affect a Portfolio's investment. Non-U.S. transaction costs, such as brokerage commissions and custody costs may be higher than in the U.S. In addition, there may be a possibility of nationalization or expropriation of assets, imposition of currency exchange controls, confiscatory taxation, and diplomatic developments that could adversely affect the values of a Portfolio's investments in certain non-U.S. countries. Investments in securities of non-U.S. issuers also are subject to foreign political and economic risk not associated with U.S. investments, meaning that political events (civil unrest, national elections, changes in political conditions and foreign relations, imposition of exchange controls and repatriation restrictions), social and economic events (labor strikes, rising inflation) and natural disasters occurring in a country where a Portfolio invests could cause the Portfolio's investments to experience gains or losses. In addition, the threat of or actual imposition of tariffs may adversely impact the price of non-U.S. securities.

Reinvestment Risk (principal risk for the Aggregate Bond Index Portfolio). Income from a Portfolio may decline when the Portfolio invests the proceeds from investment income, sales of portfolio securities or matured, traded or called debt obligations. For instance, during periods of declining interest rates, an issuer of debt obligations may exercise an option to redeem securities prior to maturity, forcing a Portfolio to reinvest the proceeds in lower-yielding securities. A decline in income received by a Portfolio from its investments is likely to have a negative effect on the yield and total return of the Portfolio Shares.

Risk of Investment in Other Pools. If a Portfolio invests in another pooled investment vehicle, it is exposed to the risk that the other pool will not perform as expected. A Portfolio is exposed indirectly to all of the risks applicable to an investment in such other pool. In addition, lack of liquidity in the underlying pool could result in its value being more volatile than the underlying portfolio of securities, and may limit the ability of a Portfolio to sell or redeem its interest in the pool at a time or at a price it might consider desirable. The investment policies and limitations of the other pool may not be the same as those of the Portfolio; as a result, the Portfolio may be subject to additional or different risks, or may achieve a reduced investment return, as a result of its investment in another pool. If a pool is an exchange-traded fund or other product traded on a securities exchange or otherwise actively traded, its shares may trade at a premium or discount to their NAV, an effect that might be more pronounced in less liquid markets. A Portfolio bears its proportionate share of the fees and expenses of any pool in which it invests. The Adviser or an affiliate may serve as investment adviser to a pool in which the Portfolio may invest, leading to potential conflicts of interest. For example, the Adviser or its affiliates may receive fees based on the amount of assets invested in the pool. Investment by a Portfolio in the pool may be beneficial to the Adviser or an affiliate in the management of the pool, by helping to achieve economies of scale or enhancing cash flows. Due to this and other factors, the Adviser may have an incentive to invest a Portfolio's assets in a pool sponsored or managed by the Adviser or its affiliates in lieu of investments by the Portfolio directly in portfolio securities, or may have an incentive to invest in the pool over a pool sponsored or managed by others. Similarly, the Adviser may have an incentive to delay or decide against the sale of interests held by a Portfolio in a pool sponsored or managed by the Adviser or its affiliates. It is possible that other clients of the Adviser or its affiliates will purchase or sell interests in a pool sponsored or managed by the Adviser or its affiliates at prices and at times more favorable than those at which a Portfolio does so.

Settlement Risk (principal risk for the Global All Cap Equity ex-U.S. Index Portfolio). Markets in different countries have different clearance and settlement procedures and in certain markets there have been times when settlements have been unable to keep pace with the volume of transactions. Delays in settlement may increase credit risk to a Portfolio, limit the ability of a Portfolio to reinvest the proceeds of a sale of securities, hinder the ability of a Portfolio to lend its portfolio securities, and potentially subject a Portfolio to penalties for its failure to deliver to on-purchasers of securities whose delivery to a Portfolio was delayed. Delays in the settlement of securities purchased by a Portfolio may limit the ability of a Portfolio to sell those securities at times and prices it considers desirable, and may subject a Portfolio to losses and costs due to its own inability to settle with subsequent purchasers of the securities from it. A Portfolio may be required to borrow monies it had otherwise expected to receive in connection with the settlement of securities sold by it, in order to meet its obligations to others. Limits on the ability of a Portfolio to purchase or sell securities due to settlement delays could increase any variance between a Portfolio's performance and that of its benchmark index.

Small-, Mid- and Micro-Capitalization Securities Risk (principal risk for the Global All Cap Equity ex-U.S. Index Portfolio and Small/Mid Cap Equity Index Portfolio). The securities of small-, mid- and micro-capitalization companies may be more volatile and may involve more risk than the securities of larger companies. These companies may have limited product lines, markets or financial resources, may lack the competitive strength of larger companies, and may depend on a few key employees. In addition, these companies may have been recently organized and may have little or no track record of success. The securities of smaller companies may trade less frequently and in smaller volumes than more widely held securities. The prices of these securities may fluctuate more sharply than those of other securities, and a Portfolio may experience some difficulty in establishing or closing out positions in these securities at prevailing market prices. There may be less publicly available information about the issuers of these securities or less market interest in these securities than in the case of larger companies, both of which can cause significant price volatility. Some securities of smaller issuers may be illiquid or may be restricted as to resale. A Portfolio may be unable to liquidate its positions in such securities at any time, or at a favorable price, in order to meet a Portfolio's obligations. Returns on investments in securities of small-, mid- and micro-capitalization companies could trail the returns on investments in securities of larger companies.

Special Risk Considerations of Investing in China (principal risk for the Global All Cap Equity ex-U.S. Index Portfolio). Investing in securities of Chinese issuers, including by investing in A Shares, involves certain risks and considerations not typically associated with investing in securities of U.S. issuers, including, among others, (i) more frequent (and potentially widespread) trading suspensions and U.S. or foreign government interventions or restrictions with respect to Chinese issuers, which could preclude the Portfolio from making certain investments or result in the Portfolio selling investments at disadvantageous times and which may also cause reduced liquidity and increased price volatility in such investments, (ii) the nature and extent of intervention by the Chinese government in the Chinese securities markets, whether such intervention will continue and the impact of such intervention or its discontinuation, (iii) the risk of nationalization or expropriation of assets, (iv) the risk that the Chinese government may decide not to continue to support economic reform programs, (v) limitations on the use of brokers, (vi) potentially higher rates of inflation, (vii) the unavailability of consistently-reliable economic data, (viii) the relatively small size and absence of operating history of many Chinese companies, (ix) accounting, auditing and financial reporting standards in China are different from U.S. standards and, therefore, disclosure of certain material information may not be available, (x) greater political, economic, social, legal and tax-related uncertainty, (xi) higher market volatility caused by any potential regional territorial conflicts or natural disasters, (xii) higher dependence on exports and international trade, (xiii) the risk of increased trade tariffs, sanctions, embargoes and other trade limitations, (xiv) restrictions on foreign ownership, and (xv) custody risks associated with investing through programs to access Chinese securities. Significant portions of the Chinese securities markets may become rapidly illiquid, as Chinese issuers have the ability to suspend the trading of their equity securities, and have shown a willingness to exercise that option in response to market volatility and other events. The liquidity of Chinese securities may shrink or disappear suddenly and without warning as a result of adverse economic, market or political events, or adverse investor perceptions, whether or not accurate.

Unconstrained Sector Risk. A Portfolio may invest a substantial portion of its assets within one or more economic sectors or industries, which may change from time to time. When a Portfolio focuses its investments in a particular industry or sector, financial, economic, business, and other developments affecting issuers in that industry, market, or economic sector will have a greater effect on the Portfolio than if it had not focused its assets in that industry, market, or economic sector, which may increase the volatility of the Portfolio. Any such investment focus may also limit the liquidity of the Portfolio. In addition, investors may buy or sell substantial amounts of the Portfolio's shares in response to factors affecting or expected to affect an industry, market, or economic sector in which the Portfolio focuses its investments, resulting in extreme inflows or outflows of cash into and out of the Portfolio. Such extreme cash inflows and outflows might affect the management of the Portfolio adversely.

U.S. Government Securities Risk (principal risk for the Aggregate Bond Index Portfolio). U.S. government securities, such as Treasury bills, notes and bonds and mortgage-backed securities guaranteed by the Government National Mortgage Association (“Ginnie Mae”), are supported by the full faith and credit of the United States; others are supported by the right of the issuer to borrow from the U.S. Treasury; others are supported by the discretionary authority of the U.S. government to purchase the agency's obligations; and still others are supported only by the credit of the issuing agency, instrumentality, or enterprise. Although U.S. government-sponsored enterprises such as the Federal Home Loan Mortgage Corporation (“Freddie Mac”) and the Federal National Mortgage Association (“Fannie Mae”) may be chartered or sponsored by Congress, they are not funded by Congressional appropriations, and their securities are not issued by the U.S. Treasury nor supported by the full faith and credit of the U.S. government. There is no assurance that the U.S. government would provide financial support to its agencies and instrumentalities if not required to do so. In addition, certain

governmental entities have been subject to regulatory scrutiny regarding their accounting policies and practices and other concerns that may result in legislation, changes in regulatory oversight and/or other consequences that could adversely affect the credit quality, availability, or investment character of securities issued by these entities. The value and liquidity of U.S. government securities may be affected adversely by changes in the ratings of those securities. Securities issued by the U.S. Treasury historically have been considered to present minimal credit risk. The downgrade in the long-term U.S. credit rating by at least two major rating agencies has introduced greater uncertainty about the ability of the U.S. to repay its obligations. Further credit rating downgrades or a U.S. credit default could decrease the value and increase the volatility of a Portfolio's investments.

Valuation Risk (principal risk for the Global All Cap Equity ex-U.S. Index Portfolio, Small/Mid Cap Equity Index Portfolio and Aggregate Bond Index Portfolio). Certain portfolio holdings may be valued on the basis of factors other than market quotations. This may occur more often in times of market turmoil or reduced liquidity. There are multiple methods that can be used to value a portfolio holding when market quotations are not readily available. The value established for any portfolio holding at a point in time might differ from what would be produced using a different methodology or if it had been priced using market quotations. Portfolio holdings that are valued using techniques other than market quotations, including “fair valued” securities, may be subject to greater fluctuation in their valuations from one day to the next than if market quotations were used. Technological issues or other service disruption issues involving third-party service providers may cause a Portfolio to value its investments incorrectly. In addition, there is no assurance that a Portfolio could sell or close out a portfolio position for the value established for it at any time, and it is possible that a Portfolio would incur a loss because a portfolio position is sold or closed out at a discount to the valuation established by a Portfolio at that time. Investors who purchase or redeem Portfolio Shares on days when the Portfolio is holding fair-valued investments may receive fewer or more shares or lower or higher redemption proceeds than they would have received if the Portfolio had not fair-valued the holding(s) or had used a different valuation methodology.

When-Issued, TBA and Delayed Delivery Securities Risk (principal risk for the Aggregate Bond Index Portfolio). A Portfolio may purchase securities on a when-issued, TBA or delayed delivery basis and may purchase securities on a forward commitment basis. The purchase price of the securities is typically fixed at the time of the commitment, but delivery and payment can take place a month or more after the date of the commitment. The prices of the securities so purchased or sold are subject to market fluctuations. At the time of delivery of the securities, the value may be more or less than the purchase or sale price. Purchase of securities on a when-issued, TBA, delayed delivery, or forward commitment basis may give rise to investment leverage, and may result in increased volatility of a Portfolio's net asset value. Default by, or bankruptcy of, a counterparty to a when-issued, TBA or delayed delivery transaction would expose a Portfolio to possible losses because of an adverse market action, expenses or delays in connection with the purchase or sale of the pools specified in such transaction. The Financial Industry Regulatory Authority, Inc. (“FINRA”) imposes mandatory margin requirements for certain types of when-issued, delayed delivery or forward commitment transactions (including TBA transactions), with limited exceptions. Such transactions require mandatory collateralization which may increase the cost of such transactions and impose added operational complexity.

Additional Information About Non-Principal Investment Strategies and Risks

Conflicts of Interest Risk. An investment in a Portfolio will be subject to a number of actual or potential conflicts of interest. For example, the Adviser or its affiliates may provide services to a Portfolio, such as securities lending agency services, custodial, administrative, bookkeeping, and accounting services, transfer agency and shareholder servicing, securities brokerage services, and other services for which the Portfolio would compensate the Adviser and/or such affiliates. The Portfolios may invest in other pooled investment vehicles sponsored, managed, or otherwise affiliated with the Adviser. There is no assurance that the rates at which a Portfolio pays fees or expenses to the Adviser or its affiliates, or the terms on which it enters into transactions with the Adviser or its affiliates will be the most favorable available in the market generally or as favorable as the rates the Adviser or its affiliates make available to other clients. Because of its financial interest, the Adviser will have an incentive to enter into transactions or arrangements on behalf of a Portfolio with itself or its affiliates in circumstances where it might not have done so in the absence of that interest, provided that the Adviser will comply with applicable regulatory requirements.

purchase) the same investment for accounts, funds, or structured products for which it serves as asset manager, or for other clients or affiliates. The Adviser and its affiliates may invest for clients in various securities that are senior, pari passu or junior to, or have interests different from or adverse to, the securities that are owned by a Portfolio. The Adviser or its affiliates, in connection with its other business activities, may acquire material nonpublic confidential information that may restrict the Adviser from purchasing securities or selling securities for itself or its clients (including the Portfolios) or otherwise using such information for the benefit of its clients or itself.

The foregoing does not purport to be a comprehensive list or complete explanation of all potential conflicts of interests which may affect a Portfolio. A Portfolio may encounter circumstances, or enter into transactions, in which conflicts of interest that are not listed or discussed above may arise.

Cybersecurity Risk. With the increased use of technologies such as the Internet and the dependence on computer systems to perform business and operational functions, funds (such as the Portfolios) and their service providers (including the Adviser) may be prone to operational and information security risks resulting from cyber-attacks and/or technological malfunctions. Furthermore, geopolitical tensions may have increased the scale and sophistication of deliberate cybersecurity attacks, particularly those from nation-states or from entities with nation-state backing. In general, cyber-attacks are deliberate, but unintentional events may have similar effects. Cyber-attacks include, among others, stealing or corrupting data maintained online or digitally, preventing legitimate users from accessing information or services on a website, releasing confidential information without authorization, and causing operational disruption. Successful cyber-attacks against, or security breakdowns of, a Portfolio, the Adviser or a custodian, transfer agent, or other affiliated or third-party service provider may adversely affect a Portfolio or its shareholders. For instance, cyber-attacks or technical malfunctions may interfere with the processing of shareholder or other transactions, affect a Portfolio's ability to calculate its NAV, cause the release of private shareholder information or confidential Portfolio information, impede trading, cause reputational damage, and subject a Portfolio to regulatory fines, penalties or financial losses, reimbursement or other compensation costs, and additional compliance costs. Cyber-attacks or technical malfunctions may render records of Portfolio assets and transactions, shareholder ownership of Portfolio Shares, and other data integral to the functioning of a Portfolio inaccessible or inaccurate or incomplete. A Portfolio may also incur substantial costs for cybersecurity risk management in order to prevent cyber incidents in the future. A Portfolio and its shareholders could be negatively impacted as a result. While the Adviser has established business continuity plans and systems designed to minimize the risk of cyber-attacks through the use of technology, processes and controls, there are inherent limitations in such plans and systems, including the possibility that certain risks have not been identified, given the evolving nature of this threat. The use of artificial intelligence (“AI”) and machine learning could exacerbate these risks or result in cyber security incidents that implicate personal data. Each Portfolio relies on third-party service providers for many of its day-to-day operations, and will be subject to the risk that the protections and protocols implemented by those service providers will be ineffective to protect the Portfolio from cyber-attack. The Adviser does not control the cybersecurity plans and systems put in place by third-party service providers, and such third-party service providers may have limited indemnification obligations to the Adviser or the Portfolios. Similar types of cybersecurity risks or technical malfunctions also are present for issuers of securities in which each Portfolio invests, which could result in material adverse consequences for such issuers, and may cause a Portfolio's investment in such securities to lose value.

Index Construction Risk. A security included in an Index may not exhibit the characteristic or provide the specific exposure for which it was selected and consequently a Portfolio's holdings may not exhibit returns consistent with that characteristic or exposure.

Index Licensing Risk. It is possible that the license under which the Adviser or a Portfolio is permitted to replicate or otherwise use an Index will be terminated or may be disputed, impaired or cease to remain in effect. In such a case, the Adviser may be required to replace the Index with another index which it considers to be appropriate in light of the investment strategy of a Portfolio. The use of any such substitute index may have an adverse impact on a Portfolio's performance. In the event that the Adviser is unable to identify a suitable replacement for the Index, it may determine to terminate a Portfolio.

of such a money market fund to fall below $1.00. It is possible that such a money market fund will issue and redeem shares at $1.00 per share at times when the fair value of the money market fund's portfolio per share is more or less than $1.00. The SEC has adopted amendments to money market fund regulation that, among other things, increase the daily and weekly liquid asset requirements. Such amendments may limit the Portfolios' investment flexibility and reduce its ability to generate returns. A money market fund may be permitted to impose redemption fees during periods of high illiquidity in the markets for the investments held by it. None of State Street Corporation, State Street Bank and Trust Company (“State Street”), State Street Global Advisors, Inc. (“SSGA”), SSGA FM or their affiliates (collectively, the “State Street Entities”) guarantee the value of an investment in a money market fund at $1.00 per share. Investors should have no expectation of capital support to a money market fund from the State Street Entities. Other money market funds price and transact at a “floating” NAV that will fluctuate along with changes in the market-based value of fund assets. Shares sold utilizing a floating NAV may be worth more or less than their original purchase price. Recent changes in the regulation of money market funds may affect the operations and structures of money market funds. A money market fund may be permitted or required to impose redemption fees during times of market stress.

Portfolio Turnover Risk. A Portfolio may engage in frequent trading of its portfolio securities. Portfolio turnover generally involves a number of direct and indirect costs and expenses to a Portfolio, including, for example, brokerage commissions, dealer mark-ups and bid/asked spreads, and transaction costs on the sale of securities and reinvestment in other securities. The costs related to increased portfolio turnover have the effect of reducing a Portfolio's investment return, and the sale of securities by a Portfolio may result in the realization of taxable capital gains, including short-term capital gains, which are taxed to individuals as ordinary income.

Securities Lending Risk. Each Portfolio may lend portfolio securities in an amount not to exceed 40% of the value of its net assets. For these purposes, net assets shall exclude the value of all assets received as collateral for the loan. Such loans may be terminated at any time. Any such loans must be continuously secured by collateral (either cash or other obligations as may be permitted under the Portfolios' securities lending program) maintained on a current basis in an amount at least equal to the market value of the securities loaned by a Portfolio, marked to market each trading day. A Portfolio will receive the amount of all dividends, interest and other distributions on the loaned securities; however, the borrower has the right to vote the loaned securities. A Portfolio will call loans to vote proxies if a material issue affecting the investment is to be voted upon. Efforts to recall such securities promptly may be unsuccessful, especially for foreign securities or thinly traded securities. Securities lending involves the risk that the Portfolio may lose money because the borrower of the loaned securities fails to return the securities in a timely manner or at all. Should the borrower of the securities fail financially, a Portfolio may experience delays in recovering the securities or exercising its rights in the collateral. Loans are made only to borrowers that are deemed by the securities lending agent to be of good financial standing. In a loan transaction, a Portfolio will also bear the risk of any decline in value of securities acquired with cash collateral. Each Portfolio expects to invest cash collateral in a pooled investment vehicle advised by the Adviser (e.g., a mutual fund or exchange-traded fund). With respect to index funds, to the extent the collateral provided or investments made with cash collateral differ from securities included in the relevant Index, such collateral or investments may have a greater risk of loss than the securities included in the Index. In addition, a Portfolio will be subject to the risk that any income generated by reinvesting cash collateral is lower than any fees the Portfolio has agreed to pay a borrower.

Portfolio Holdings Disclosure

The Portfolios' portfolio holdings disclosure policy is described in the Statement of Additional Information (“SAI”).

Management and Organization

Each Portfolio is a separate, diversified series of the State Street Institutional Investment Trust (the “Trust”), which is an open-end management investment company organized as a business trust under the laws of the Commonwealth of Massachusetts.

Investment Adviser

SSGA FM serves as the investment adviser to each Portfolio pursuant to an investment advisory agreement (“Investment Advisory Agreement”) between the Trust and the Adviser, and, subject to the oversight of the Board, is responsible for the investment management of each Portfolio. The Adviser provides an investment management program for each Portfolio and manages the investment of each Portfolio's assets. In addition, the Adviser provides administrative, compliance and general management services to each Portfolio. The Adviser is a wholly-owned subsidiary of State Street Global Advisors, Inc., which itself is a wholly-owned subsidiary of State Street Corporation. The Adviser is registered with the U.S. Securities and Exchange Commission (“SEC”) under the Investment Advisers Act of 1940, as amended. The Adviser and certain other affiliates of State Street Corporation make up SSGA. SSGA is one of the world's largest institutional money managers and the investment management arm of State Street Corporation. As of December 31, 2024, the Adviser managed approximately $1.11 trillion in assets and SSGA managed approximately $4.72 trillion in assets. The Adviser's principal business address is One Iron Street, Boston, Massachusetts 02210.

The Portfolios' shares are offered exclusively to other investors (including without limitation, registered investment companies, private investment pools, bank collective funds, and investment separate accounts) that pay fees to SSGA FM or its affiliates. The Portfolios pay no investment advisory fees to SSGA FM. The fees paid by those investment vehicles to SSGA FM (or its affiliates) vary depending on a number of factors, including by way of example, the services provided, the risks borne by SSGA FM (or its affiliates), fee rates paid by competitive investment vehicles, and in some cases direct negotiation with investors.

Total Annual Fund Operating Expense Waiver. SSGA FM, as the investment adviser to each of the Small/Mid Cap Equity Index Portfolio and the Global All Cap Equity ex-U.S. Index Portfolio, is contractually obligated, through April 30, 2026, (i) to waive up to the full amount of the advisory fee payable by the Portfolio, and/or (ii) to reimburse the Portfolio for expenses to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, extraordinary expenses, and distribution, shareholder servicing and sub-transfer agency fees) exceed average daily net assets on an annual basis of 0.08% for the Global All Cap Equity ex-U.S. Index Portfolio and 0.03% for the Small/Mid Cap Equity Index Portfolio. These waiver and/or reimbursement arrangements may not be terminated prior to April 30, 2026 except with approval of the Portfolios' Board of Trustees. SSGA FM, as the investment adviser to the Equity 500 Index II Portfolio and the Aggregate Bond Index Portfolio, is contractually obligated, through April 30, 2026, (i) to waive up to the full amount of the advisory fee payable by the Portfolio and/or (ii) to reimburse the Portfolio to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, extraordinary expenses and distribution, shareholder servicing, and sub-transfer agency fees) exceed average daily net assets on an annual basis of 0.02% for the Equity 500 Index II Portfolio and 0.025% for Aggregate Bond Index Portfolio. These waiver and/or reimbursement arrangements may not be terminated prior to April 30, 2026 except with approval of the Portfolios' Board of Trustees.

A discussion regarding the Board's consideration of the Portfolio's Investment Advisory Agreement for each of the Aggregate Bond Index Portfolio, the Equity 500 Index II Portfolio, the Global All Cap Equity ex-U.S. Index Portfolio and the Small/Mid Cap Equity Index Portfolio is provided in each Portfolio's Form N-CSR filing with the SEC for the period ended June 30, 2024.

Portfolio Management

The Adviser manages the Portfolios using a team of investment professionals. The team approach is used to create an environment that encourages the flow of investment ideas. The portfolio managers within the team work together in a cohesive manner to develop and enhance techniques that drive the investment process for the respective investment strategy. This approach requires portfolio managers to share a variety of responsibilities, including investment strategy and analysis, while retaining responsibility for the implementation of the strategy within any particular portfolio. The approach also enables the team to draw upon the resources of other groups within SSGA. Each portfolio management team is overseen by SSGA's internal governance.

The table below identifies the professionals primarily responsible for the day-to-day management of each Portfolio:

Portfolio Managers	Portfolios
Karl Schneider and Amy Scofield	Equity 500 Index II Portfolio
Marc DiCosimo, Joanna Madden and Michael Przygoda	Aggregate Bond Index Portfolio
Karl Schneider and Olga Winner	Global All Cap Equity ex-U.S. Index Portfolio
Karl Schneider and Ted Janowsky	Small/Mid Cap Equity Index Portfolio

Michael Przygoda, CFA, is a Vice President of SSGA and the Adviser and a Portfolio Manager in the Fixed Income Beta Solutions Group, managing a variety of securitized and custom aggregate bond strategies. Prior to joining the Fixed Income Beta Solutions Group in 2012, Mr. Przygoda worked as an MBS Trader and a portfolio analyst in the Government Solutions Team and previously managed the Active Fixed Income Operations Team. Mr. Przygoda received his Bachelor of Arts in Finance from Stonehill College and his Master of Science in Finance from Suffolk University. Mr. Przygoda has earned the Chartered Financial Analyst (CFA) designation and is a member of both the CFA Institute and CFA Society Boston, Inc.

Additional information about the portfolio managers' compensation, other accounts managed by the portfolio managers, and the portfolio managers' ownership of the Portfolios is available in the SAI.

Other Fund Services

The Administrator, Sub-Administrator, Custodian, Transfer Agent and Dividend Disbursing Agent

The Adviser serves as administrator of each Portfolio. State Street, a subsidiary of State Street Corporation, serves as sub-administrator, custodian, transfer agent and dividend disbursing agent (the “Transfer Agent”) for each Portfolio. Each Portfolio pays an annual fee that is accrued daily and payable monthly for the administration, sub-administration, custody and transfer agency services SSGA FM and State Street provide.

The Distributor

State Street Global Advisors Funds Distributors, LLC serves as the Portfolios' distributor (“SSGA FD”) pursuant to the Distribution Agreement between SSGA FD and the Trust.

Additional Information

The Trustees of the Trust oversee generally the operations of the Portfolios and the Trust. The Trust enters into contractual arrangements with various parties, including, among others, the Portfolios' investment adviser, custodian, transfer agent, and accountants, who provide services to the Portfolios. Shareholders are not parties to any such contractual arrangements or intended beneficiaries of those contractual arrangements, and those contractual arrangements are not intended to create in any shareholder any right to enforce them directly against the service providers or to seek any remedy under them directly against the service providers.

This Prospectus provides information concerning the Trust and the Portfolios that you should consider in determining whether to purchase shares of the Portfolios. Neither this Prospectus, nor the related SAI, is intended, or should be read, to be or to give rise to an agreement or contract between the Trust or the Portfolios and any investor, or to give rise to any rights in any shareholder or other person other than any rights under federal or state law that may not be waived.

Shareholder Information

Determination of Net Asset Value

Each Portfolio determines its NAV per share once each business day as of the scheduled close of regular trading on the New York Stock Exchange (the “NYSE”). Pricing does not occur on NYSE holidays. A business day is one on which the NYSE is open for regular trading. The Federal Reserve is closed on certain holidays on which the NYSE is open. These holidays are Columbus Day and Veterans Day. On these holidays, you will not be able to purchase shares by wiring Federal Funds because Federal Funds wiring does not occur on days when the Federal Reserve is closed. In unusual circumstances, such as an emergency or an unscheduled close or halt of trading on the NYSE, the time at which share prices are determined may be changed. The NAV per share is based on the market value of the investments held in a

Portfolio. The NAV of each class of a Portfolio's Shares is calculated by dividing the value of the assets of the Portfolio attributable to that class less the liabilities of the Portfolio attributable to that class by the number of shares in the class outstanding. As noted in this Prospectus, each Portfolio may invest in securities listed on foreign exchanges, or otherwise traded in a foreign market, and those securities may trade on weekends or other days when each Portfolio does not price its shares. Consequently, the NAV of each Portfolio's shares may change on days when shareholders are not able to purchase or redeem the Portfolio's shares. Purchase and redemption orders for Portfolio Shares are processed, respectively, at the NAV next determined after the Portfolio accepts a purchase order or receives a redemption request in good form. Each Portfolio values each security or other investment pursuant to guidelines adopted by the Board. The Board has appointed the Adviser as the valuation designee to fair value securities or other investments pursuant to procedures approved by the Portfolios' Board, under certain limited circumstances. For example, fair value pricing may be used when market quotations are not readily available or reliable, such as when (i) trading for a security is restricted; or (ii) a significant event, as determined by the Adviser, that may affect the value of one or more securities or other investments held by a Portfolio occurs after the close of a related exchange but before the determination of a Portfolio's NAV. Attempts to determine the fair value of securities or other investments introduce an element of subjectivity to the pricing of securities or other investments. As a result, the price of a security or other investment determined through fair valuation techniques may differ from the price quoted or published by other sources and may not accurately reflect the price a Portfolio would have received had it sold the investment. To the extent that a Portfolio invests in the shares of other registered open-end investment companies that are not traded on an exchange (mutual funds), such shares are valued at their published NAVs per share as reported by the funds. The prospectuses of these funds explain the circumstances under which the funds will use fair value pricing and the effects of using fair value pricing.

Purchasing Shares

Generally, shares of a Portfolio may be purchased only by or on behalf of other registered investment companies or private clients for which the Adviser or an affiliate serves as investment adviser (or in a similar capacity). The price for Portfolio Shares is the NAV per share. Orders received in good form (a purchase order is in good form if it meets the requirements implemented from time to time by a Portfolio or its Transfer Agent, and for new accounts includes submission of a completed and signed application and all documentation necessary to open an account) will be priced at the NAV next calculated after the order is accepted by the Portfolios.

There is no minimal initial investment in a Portfolio and there is no minimum subsequent investment. (If you purchase shares by check, your order will not be in good form until the Portfolio's transfer agent receives federal funds for the check.) The Portfolios reserve the right to cease accepting investments at any time or to reject any purchase order.

In accordance with certain federal regulations, the Trust is required to obtain, verify and record information that identifies each entity that applies to open an account. For this reason, when you open (or change ownership of) an account, the Trust will request certain information, including your name, residential/business address, date of birth (for individuals) and taxpayer identification number or other government identification number and other information that will allow us to identify you which will be used to verify your identity. The Trust may also request to review other identification documents such as driver license, passport or documents showing the existence of the business entity. If you do not provide sufficient information to verify your identity, the Trust will not open an account for you. As required by law, the Trust may employ various procedures, such as comparing your information to fraud databases or requesting additional information and documentation from you, to ensure that the information supplied by you is correct. The Trust reserves the right to reject any purchase order for any reason, including failure to provide the Trust with information necessary to confirm your identity as required by law.

If you are purchasing through a Financial Intermediary, please contact your intermediary as their requirements may differ.

Redeeming Shares

An investor may redeem all or any portion of its investment at the NAV next determined after it submits a redemption request, in proper form, to a Portfolio. A Portfolio will typically pay the proceeds of the redemption on the next business day after the redemption, but in any event no more than seven days after the redemption. A Portfolio may delay paying redemption proceeds if the request is made within 15 days of the purchase of such Portfolio Shares and the payment or customer verification process is not complete. There will be no such delay for redemptions following purchases paid by federal funds wire or by bank cashier's check, certified check or treasurer's check. The right of any investor to receive payment with respect to any redemption may be suspended or the payment of the redemption proceeds postponed

beyond seven days during any period in which the NYSE is closed (other than weekends or holidays) or trading on the NYSE is restricted or, to the extent otherwise permitted by the 1940 Act, as amended, if an emergency exists as a result of which disposal by a Portfolio of securities owned by it is not reasonably practicable or it is not reasonably practicable for a Portfolio fairly to determine the value of its net assets. In addition, the SEC may by order permit suspension of redemptions for the protection of investors of the Portfolios.

The transfer agent may temporarily delay for more than seven days the disbursement of redemption proceeds from the Portfolio account of a “Specified Adult” (as defined in Financial Industry Regulatory Authority, Inc. (“FINRA”) Rule 2165) based on a reasonable belief that financial exploitation of the Specified Adult has occurred, is occurring, has been attempted, or will be attempted, subject to certain conditions.

Under normal circumstances, each Portfolio expects to meet redemption requests by using cash or cash equivalents in its portfolio and/or selling portfolio assets to generate cash. The Portfolios also may pay redemption proceeds using cash obtained through borrowing arrangements (including under the Portfolios' line of credit, which is shared across all registered funds advised by SSGA FM (other than money market funds)) that may be available from time to time.

A Portfolio may pay all or a portion of your redemption proceeds by giving you securities (for example, if the Portfolio reasonably believes that a cash redemption may have a substantial impact on the Portfolio and its remaining shareholders). A redemption is generally a taxable event for shareholders, regardless of whether the redemption is satisfied in cash or in kind. You may pay transaction costs and/or taxes to dispose of the securities, and you may receive less for them than the price at which they were valued for purposes of the redemption. In addition, you will be subject to the market risks associated with such securities until such time as you choose to dispose of the security.

During periods of deteriorating or stressed market conditions, when an increased portion of a Portfolio's portfolio may be comprised of less liquid investments, or during extraordinary or emergency circumstances, a Portfolio may be more likely to pay redemption proceeds with cash obtained through short-term borrowing arrangements (if available) or by giving you securities.

If your account is held through an Intermediary, please contact them for additional assistance and advice on how to redeem your shares.

About Mail Transactions

If you choose to purchase or redeem shares by sending instructions by regular mail, they will not be deemed received in good order until they are released by the post office and redelivered to the Transfer Agent's physical location at 801 Pennsylvania Avenue, Suite 219737 in Kansas City, MO 64105-1307. There will be a time lag, which may be one or more days, between regular mail receipt at the post office box and redelivery to such physical location and a Portfolio's net asset value may change over those days. You might consider using express rather than regular mail if you believe time of receipt of your transaction request to be sensitive.

Policies to Prevent Market Timing

Frequent purchases and redemptions of Portfolio Shares may present risks for other shareholders of the Portfolios, which may include, among other things, interference in the efficient management of a Portfolio's portfolio, dilution in the value of Portfolio Shares held by long-term shareholders, increased brokerage and administrative costs and forcing the Portfolios to hold excess levels of cash.

Therefore, the Trust's Board of Trustees has adopted policies and procedures designed to detect and prevent inappropriate short-term trading activity that is harmful to the Portfolios. Because most of the interests in the Portfolios are held by investors indirectly through one or more financial intermediaries, the Portfolios do not generally have information about the identity of those investors or about transactions effected by those investors. Rather, the Portfolios and their service providers periodically review cash inflows and outflows from and to those intermediaries in an attempt to detect inappropriate trading activity by investors holding shares through those intermediaries. The Portfolios may seek to obtain underlying account trading activity information from financial intermediaries when, in the Adviser's judgment, the trading activity suggests possible market timing. There is no assurance that the Portfolios or the Adviser will be able to determine whether trading by an investor holding shares through a financial intermediary is engaged in trading activity that may be harmful to the Portfolios or their shareholders.

The Portfolios reserve the right in their discretion to reject any purchase, in whole or in part including, without limitation, by a person whose trading activity in Portfolio Shares the Adviser believes could be harmful to the Portfolios. The Portfolios may decide to restrict purchase activity in their shares based on various factors, including, without limitation, whether frequent purchase and sale activity will disrupt portfolio management strategies and adversely affect performance. There can be no assurance that the Portfolios, the Adviser or State Street will identify all frequent purchase and sale activity affecting the Portfolios.

Unclaimed Property

Many states have unclaimed property rules that provide for transfer to the state (also known as “escheatment”) of unclaimed property under various circumstances. These circumstances include inactivity (e.g., no owner-initiated contact for a certain period), returned mail (e.g., when mail sent to a shareholder is returned by the post office as undeliverable), or a combination of both inactivity and returned mail. If a Portfolio identifies property as unclaimed, it will attempt to contact the shareholder, but if that attempt is unsuccessful, the account may be considered abandoned and escheated to the state after the passage of a certain period of time (as required by applicable state law).

It is your responsibility to ensure that you maintain a correct address for your account, and maintain contact in ways such as by contacting the Portfolio's transfer agent by mail or telephone or accessing your account through the Portfolio's website, and promptly cashing all checks for dividends, capital gains and redemptions. State requirements for maintaining contact with an account can vary and are subject to change. If you invest in the Portfolio through a financial intermediary, we encourage you to contact the financial intermediary regarding applicable state unclaimed property laws. The Portfolio, the transfer agent and the distributor will not be liable to shareholders or their representatives for good faith compliance with state unclaimed property laws. Please check your state's unclaimed or abandoned property website for specific information.

If you are a resident of the state of Texas, you may designate a representative to receive escheatment notifications by completing and submitting a designation form, which you can find on the website of the Texas Comptroller. Designating such a representative may be beneficial, since Texas law provides that the escheatment period will cease if the representative, after receiving an escheatment notification regarding your account, communicates knowledge of your location and confirms that you have not abandoned your account. You can mail a completed designation form to a Portfolio (if you hold shares directly with a Portfolio) or to your financial intermediary (if you do not hold shares directly with a Portfolio).

Dividends, Distributions and Tax Considerations

Dividends of investment income and capital gain distributions of the Portfolios will be declared and paid at least annually. Any investment income and capital gains that have not been distributed by December of each calendar year are generally distributed at such time. When a Portfolio distributes investment income or capital gains, the NAV per share is reduced by the amount of the distribution. Dividends of investment income and capital gain distributions will be paid in additional shares on the record date unless you have elected to receive them in cash.

Delivery of Documents to Accounts Sharing an Address

To reduce expenses, we may mail only one copy of the Portfolios' Prospectus and each annual and semi-annual report to those addresses shared by two or more accounts. If you wish to receive individual copies of these documents, please call us at (800) 647-7327, or contact your financial institution. We will begin sending you individual copies thirty (30) days after receiving your request.

Tax Considerations

The following discussion is a summary of some important U.S. federal income tax considerations generally applicable to an investment in a Portfolio. Your investment in a Portfolio may have other tax implications. Please consult your tax advisor about federal, state, local, foreign or other tax laws applicable to you. Investors, including non-U.S. investors, may wish to consult the SAI tax section for additional disclosure.

Each Portfolio has elected to be treated as a regulated investment company and intends each year to qualify and to be eligible to be treated as such. A regulated investment company generally is not subject to tax at the corporate level on income and gains that are timely distributed to shareholders. In order to qualify and be eligible for treatment as a regu

lated investment company, a Portfolio must, among other things, satisfy diversification, 90% gross income and distribution requirements. A Portfolio's failure to qualify as a regulated investment company would result in corporate level taxation, and consequently, a reduction in income available for distribution to shareholders.

For U.S. federal income tax purposes, distributions of investment income generally are taxable to you as ordinary income. Taxes on distributions of capital gains generally are determined by how long a Portfolio owned (or is deemed to have owned) the investments that generated them, rather than how long you have owned your Portfolio Shares. Distributions of net capital gains (that is, the excess of net long-term capital gains over net short-term capital losses) from the sale of investments that a Portfolio owned (or is deemed to have owned) for more than one year that are properly reported by a Portfolio as capital gain dividends generally will be treated as long-term capital gain includible in your net capital gain and taxed to individuals at reduced rates. Distributions of gains from investments that a Portfolio owned (or is deemed to have owned) for one year or less generally will be taxable to you as ordinary income. Distributions of investment income properly reported by a Portfolio as derived from “qualified dividend income,” which will not include income from the Portfolio's portfolio securities on loan, are taxed to individuals at the rates applicable to net capital gain, provided holding period and other requirements are met by both the shareholder and the Portfolio. Distributions are taxable to you even if they are paid from income or gains earned by a Portfolio before your investment (and thus were included in the price you paid for your shares). Distributions may also be subject to state and local taxes and are taxable whether you receive them in cash or reinvest them in additional shares. Distributions in excess of a Portfolio's current and accumulated earnings and profits are treated as a return of capital to the extent of your basis in the applicable Portfolio's shares, and, in general, as capital gain thereafter.

Any gain resulting from the redemption or other taxable disposition of Portfolio Shares generally will also be taxable to you as either short-term or long-term capital gain, depending upon how long you held such Portfolio Shares.

An additional 3.8% Medicare contribution tax is imposed on the “net investment income” of individuals, estates and trusts to the extent their income exceeds certain threshold amounts. Net investment income generally includes for this purpose dividends paid by a Portfolio, including any capital gain dividends, and net gains recognized on the redemption (or other taxable disposition) of Portfolio Shares.

A Portfolio's income from or proceeds of dispositions of its investments in non-U.S. assets may be subject to non-U.S. withholding or other taxes, which will reduce the yield on those investments. In certain instances, a Portfolio may be entitled to elect to pass through to its shareholders a credit (or deduction, for a shareholder that itemizes deductions and so chooses) for foreign taxes (if any) borne with respect to foreign securities income earned by the Portfolio. If the Portfolio so elects, shareholders will include in gross income from foreign sources their pro rata shares of such taxes, if any, treated as paid by the Portfolio. There can be no assurance that a Portfolio will make such election, even if it is eligible to do so. If a Portfolio does not qualify for or does not make such election, shareholders will not be entitled separately to claim a credit or deduction with respect to foreign taxes incurred by the Portfolio; in that case the foreign tax will nonetheless reduce the Portfolio's taxable income. Shareholders that are not subject to U.S. federal income tax, and those who invest in a Portfolio through tax-advantaged accounts (including those who invest through IRAs or other tax-advantaged retirement plans), generally will receive no benefit from any tax credit or deduction passed through by the Portfolio. Under certain circumstances, if a Portfolio receives a refund of foreign taxes paid in respect of a prior year, the value of Portfolio Shares could be affected or any foreign tax credits or deductions passed through to shareholders in respect of the Portfolio's foreign taxes for the current year could be reduced.

Certain of a Portfolio's investment practices, including derivative transactions and investments in debt obligations issued or purchased at a discount, will be subject to special and complex U.S. federal income tax provisions. These special rules may affect the timing, character, and/or amount of a Portfolio's distributions, and may require the Portfolio to sell its investments at a time when it is not advantageous to do so.

If you are not a U.S. person, dividends paid by a Portfolio that the Portfolio properly reports as capital gain dividends, short-term capital gain dividends, or interest-related dividends, each as further defined in the SAI, are not subject to withholding of U.S. federal income tax, provided that certain requirements are met. A Portfolio is permitted, but is not required, to report any part of its dividends as are eligible for such treatment. A Portfolio's dividends other than those the Portfolio so reports as capital gain dividends, short-term capital gain dividends, or interest-related dividends generally will be subject to U.S. withholding tax at a 30% rate (or lower applicable treaty rate). See each Portfolio's SAI for further information.

The U.S. Treasury and the Internal Revenue Service (the “IRS”) generally require a Portfolio to obtain information sufficient to identify the status of each shareholder under sections 1471-1474 of the Internal Revenue Code of 1986, as amended, and the U.S. Treasury and IRS guidance issued thereunder (collectively, “FATCA”) or under an applicable intergovernmental agreement between the United States and a foreign government. Please see the SAI for more information on FATCA reporting requirements.

Cost Basis Reporting. U.S. Treasury regulations mandate cost basis reporting to shareholders and the IRS for redemptions of Portfolio Shares acquired on or after January 1, 2012 (“Post Effective Date Shares”). If you acquire and hold shares directly through the Portfolios and not through a Financial Intermediary, The Transfer Agent will use a default average cost basis methodology for tracking and reporting your cost basis on Post Effective Date Shares, unless you request, in writing, another cost basis reporting methodology.

Financial Highlights

The financial highlight tables are intended to help you understand each Portfolio's financial performance since each Portfolio's inception. Certain information reflects the performance results for a single Portfolio Share. The total returns in the table represent the rate that an investor would have earned (or lost) on an investment in each Portfolio (assuming reinvestment of all dividends and distributions). This information has been audited by Ernst & Young LLP, the Trust's independent registered public accounting firm, whose report, along with each Portfolio's financial highlights and financial statements, are included in each Portfolio's Form N-CSR filing, which are available upon request. Any references to Notes in these financial highlight tables refer to the “Notes to Financial Statements” section of each Portfolio's financial statements, and the financial information included in these tables should be read in conjunction with the financial statements incorporated by reference in the SAI.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET AGGREGATE BOND INDEX PORTFOLIO

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period


	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20 (a)
Net asset value, beginning of period	$89.54	$87.55	$103.42	$107.23	$102.60
Income (loss) from investment operations:
Net investment income (loss) (b)	3.34	2.85	2.05	1.61	0.65
Net realized and unrealized gain (loss)	(2.16 )	1.97	(15.74 )	(3.46 )	7.25
Total from investment operations	1.18	4.82	(13.69 )	(1.85 )	7.90
Contribution from affiliate	—	—	—	—	0.00 (c)
Other capital	—	0.00 (c)	—	—	—
Distributions to shareholders from:
Net investment income	(3.29 )	(2.83 )	(2.18 )	(1.96 )	(2.67 )
Net realized gains	—	—	—	—	(0.60 )
Total distributions	(3.29 )	(2.83 )	(2.18 )	(1.96 )	(3.27 )
Net asset value, end of period	$87.43	$89.54	$87.55	$103.42	$107.23
Total return (d)	1.34 %	5.61 %	(13.30 )%	(1.72 )%	7.86 %(e)
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$4,116,423	$2,810,209	$2,073,291	$2,099,436	$1,415,008
Ratios to average net assets:
Total expenses	0.02 %	0.02 %	0.02 %	0.02 %	0.03 %
Net expenses	0.02 %	0.02 %	0.02 %	0.01 %	0.03 %
Net investment income (loss)	3.78 %	3.25 %	2.21 %	1.55 %	2.20 %
Portfolio turnover rate	16 %(f)	14 %(f)	21 %(f)	21 %(f)	37 %(f)

(a)	After the close of trading on April 17, 2020, the State Street Aggregate Bond Index Portfolio underwent a 1-for-10 reverse sharesplit. The historical per share activity presented here has been retroactively adjusted to reflect this split.
(b)	Net investment income per share is calculated using the average shares method.
(c)	Amount is less than $0.005 per share.
(d)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(e)	If an Affiliate had not made a contribution during the year ended December 31, 2020, the total return would have remained 7.86%.
(f)	Portfolio turnover rate excludes to-be-announced (“TBA”) transactions.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET EQUITY 500 INDEX II PORTFOLIO

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period


	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20 (a)
Net asset value, beginning of period	$433.20	$348.16	$432.09	$344.77	$302.40
Income (loss) from investment operations:
Net investment income (loss) (b)	7.32	6.81	6.02	5.30	5.44
Net realized and unrealized gain (loss)	101.09	84.54	(84.50 )	92.75	49.45
Total from investment operations	108.41	91.35	(78.48 )	98.05	54.89
Contribution from affiliates	—	—	0.00 (c)	—	—
Distributions to shareholders from:
Net investment income	(7.77 )	(6.31 )	(3.73 )	(5.07 )	(5.28 )
Net realized gains	(2.48 )	—	(1.72 )	(5.66 )	(7.24 )
Total distributions	(10.25 )	(6.31 )	(5.45 )	(10.73 )	(12.52 )
Net asset value, end of period	$531.36	$433.20	$348.16	$432.09	$344.77
Total return (d)	24.99 %	26.27 %	(18.18 )%	28.52 %	18.30 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$14,977,100	$10,462,465	$7,267,890	$7,078,644	$4,732,247
Ratios to average net assets:
Total expenses	0.02 %	0.02 %	0.02 %	0.02 %	0.02 %
Net expenses	0.02 %	0.02 %	0.02 %	0.02 %	0.02 %
Net investment income (loss)	1.47 %	1.74 %	1.61 %	1.34 %	1.79 %
Portfolio turnover rate	4 %	4 %	2 %	6 %	6 %

(a)	On April 17, 2020, the State Street Equity 500 Index II Portfolio underwent a 1-for-20 reverse share split. The historical per share activity presented here has been retroactively adjusted to reflect this split.
(b)	Net investment income per share is calculated using the average shares method.
(c)	Amount is less than $0.005 per share.
(d)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET GLOBAL ALL CAP EQUITY EX-U.S. INDEX PORTFOLIO

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period


	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20 (a)
Net asset value, beginning of period	$112.69	$100.36	$122.91	$116.43	$106.60
Income (loss) from investment operations:
Net investment income (loss) (b)	3.41	3.27	3.16	3.09	2.28
Net realized and unrealized gain (loss)	2.20	12.40	(23.35 )	6.56	9.49
Total from investment operations	5.61	15.67	(20.19 )	9.65	11.77
Other capital	—	0.00 (c)	(0.00 )(c)	—	(0.00 )(c)
Distributions to shareholders from:
Net investment income	(3.54 )	(3.34 )	(2.36 )	(3.17 )	(1.94 )
Net asset value, end of period	$114.76	$112.69	$100.36	$122.91	$116.43
Total return (d)	5.00 %	15.68 %	(16.43 )%	8.37 %	11.07 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$8,318,199	$6,615,357	$4,827,067	$4,772,699	$3,270,962
Ratios to average net assets:
Total expenses	0.04 %	0.05 %	0.05 %	0.05 %	0.05 %
Net expenses	0.04 %	0.05 %	0.05 %	0.05 %	0.05 %
Net investment income (loss)	2.87 %	3.04 %	3.01 %	2.48 %	2.29 %
Portfolio turnover rate	1 %	1 %	2 %	2 %	2 %

(a)	After the close of trading on April 17, 2020, the State Street Global All Cap Equity Index Portfolio underwent a 1-for-10 reverse share split. The historical per share activity presented here has been retroactively adjusted to reflect this split.
(b)	Net investment income per share is calculated using the average shares method.
(c)	Amount is less than $0.005 per share.
(d)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period


	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20 (a)
Net asset value, beginning of period	$284.07	$230.49	$316.31	$327.73	$254.60
Income (loss) from investment operations:
Net investment income (loss) (b)	3.94	3.77	3.73	3.50	3.01
Net realized and unrealized gain (loss)	45.12	54.23	(84.22 )	36.64	79.67
Total from investment operations	49.06	58.00	(80.49 )	40.14	82.68
Other capital	0.00 (c)	0.00 (c)	—	0.00 (c)	—
Distributions to shareholders from:
Net investment income	(4.27 )	(3.68 )	(3.23 )	(3.47 )	(2.90 )
Net realized gains	(14.32 )	(0.74 )	(2.10 )	(48.09 )	(6.65 )
Total distributions	(18.59 )	(4.42 )	(5.33 )	(51.56 )	(9.55 )
Net asset value, end of period	$314.54	$284.07	$230.49	$316.31	$327.73
Total return (d)	17.20 %	25.18 %	(25.44 )%	12.50 %	32.46 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$2,668,344	$2,253,655	$1,629,196	$1,616,128	$1,065,859
Ratios to average net assets:
Total expenses	0.02 %	0.03 %	0.03 %	0.02 %	0.03 %
Net expenses	0.02 %	0.03 %	0.03 %	0.02 %	0.03 %
Net investment income (loss)	1.29 %	1.49 %	1.46 %	0.96 %	1.19 %
Portfolio turnover rate	24 %	24 %	19 %	28 %	52 %

(a)	After the close of trading on April 17, 2020, the State Street Small/Mid Cap Equity Index Portfolio underwent a 1-for-20 reverse share split. The historical per share activity presented here has been retroactively adjusted to reflect this split.
(b)	Net investment income per share is calculated using the average shares method.
(c)	Amount is less than $0.005 per share.
(d)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.

Index/Trademark Licenses/Disclaimers

The State Street Equity 500 Index II Portfolio is not sponsored, endorsed, sold or marketed by SPDJI, Dow Jones, S&P, any of their respective affiliates (collectively, “S&P Dow Jones Indices”). S&P Dow Jones Indices does not make any representation or warranty, express or implied, to the owners of the State Street Equity 500 Index II Portfolio or any member of the public regarding the advisability of investing in securities generally or in the State Street Equity 500 Index II Portfolio particularly or the ability of the Index to track general market performance. S&P Dow Jones Indices licenses to Licensee the Index and certain trademarks, service marks and/or trade names of S&P Dow Jones Indices and/or its licensors. The Index is determined, composed and calculated by S&P Dow Jones Indices without regard to Licensee or the State Street Equity 500 Index II Portfolio. S&P Dow Jones Indices has no obligation to take the needs of Licensee or the owners of the State Street Equity 500 Index II Portfolio into consideration in determining, composing or calculating the Index. S&P Dow Jones Indices is not responsible for and has not participated in the determination of the prices, and amount of the State Street Equity 500 Index II Portfolio or the timing of the issuance or sale of the State Street Equity 500 Index II Portfolio or in the determination or calculation of the equation by which the State Street Equity 500 Index II Portfolio is to be converted into cash, surrendered or redeemed, as the case may be. S&P Dow Jones Indices has no obligation or liability in connection with the administration, marketing or trading of the State Street Equity 500 Index II Portfolio. S&P Dow Jones Indices LLC is not an investment or tax advisor. Inclusion of a security within an index is not a recommendation by S&P Dow Jones Indices to buy, sell, or hold such security, nor is it considered to be investment advice.

NEITHER S&P DOW JONES INDICES NOR THIRD PARTY LICENSOR GUARANTEES THE ADEQUACY, ACCURACY, TIMELINESS AND/OR THE COMPLETENESS OF THE INDEX OR ANY DATA RELATED THERETO OR ANY COMMUNICATION, INCLUDING BUT NOT LIMITED TO, ORAL OR WRITTEN COMMUNICATION (INCLUDING ELECTRONIC COMMUNICATIONS) WITH RESPECT THERETO. S&P DOW JONES INDICES AND THIRD PARTY LICENSOR SHALL NOT BE SUBJECT TO ANY DAMAGES OR LIABILITY FOR ANY ERRORS, OMISSIONS, OR DELAYS THEREIN. S&P DOW JONES INDICES AND THIRD PARTY LICENSOR MAKES NO EXPRESS OR IMPLIED WARRANTIES, AND EXPRESSLY DISCLAIMS ALL WARRANTIES, OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR USE OR AS TO RESULTS TO BE OBTAINED BY LICENSEE, OWNERS OF THE STATE STREET EQUITY 500 INDEX II PORTFOLIO, OR ANY OTHER PERSON OR ENTITY FROM THE USE OF THE INDICES OR WITH RESPECT TO ANY DATA RELATED THERETO. WITHOUT LIMITING ANY OF THE FOREGOING, IN NO EVENT WHATSOEVER SHALL S&P DOW JONES INDEX OR THIRD PARTY LICENSOR BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES INCLUDING BUT NOT LIMITED TO, LOSS OF PROFITS, TRADING LOSSES, LOST TIME OR GOODWILL, EVEN IF THEY HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES, WHETHER IN CONTRACT, TORT, STRICT LIABILITY, OR OTHERWISE. THERE ARE NO THIRD PARTY BENEFICIARIES OF ANY AGREEMENTS OR ARRANGEMENTS BETWEEN S&P DOW JONES INDICES AND LICENSEE, OTHER THAN THE LICENSORS OF S&P DOW JONES INDICES.

THE STATE STREET GLOBAL ALL CAP EQUITY EX-U.S. INDEX PORTFOLIO IS NOT SPONSORED, ENDORSED, SOLD OR PROMOTED BY MSCI INC. (“MSCI”), ANY OF ITS AFFILIATES, ANY OF ITS INFORMATION PROVIDERS OR ANY OTHER THIRD PARTY INVOLVED IN, OR RELATED TO, COMPILING, COMPUTING OR CREATING ANY MSCI INDEX (COLLECTIVELY, THE “MSCI PARTIES”).THE MSCI INDICES ARE THE EXCLUSIVE PROPERTY OF MSCI. MSCI AND THE MSCI INDEX NAMES ARE SERVICE MARK(S) OF MSCI OR ITS AFFILIATES AND HAVE BEEN LICENSED FOR USE FOR CERTAIN PURPOSES BY THE LICENSEE. NONE OF THE MSCI PARTIES MAKES ANY REPRESENTATION OR WARRANTY, EXPRESS OR IMPLIED, TO THE ISSUER OR OWNERS OF THE MSCI FUNDS OR ANY OTHER PERSON OR ENTITY REGARDING THE ADVISABILITY OF INVESTING IN FUNDS GENERALLY OR IN THE MSCI FUNDS PARTICULARLY OR THE ABILITY OF ANY MSCI INDEX TO TRACK CORRESPONDING STOCK MARKET PERFORMANCE. MSCI OR ITS AFFILIATES ARE THE LICENSORS OF CERTAIN TRADEMARKS, SERVICE MARKS AND TRADE NAMES AND OF THE MSCI INDICES WHICH ARE DETERMINED, COMPOSED AND CALCULATED BY MSCI WITHOUT REGARD TO THE MSCI FUNDS OR THE ISSUER OR OWNERS OF THE MSCI FUNDS OR ANY OTHER PERSON OR ENTITY. NONE OF THE MSCI PARTIES HAS ANY OBLIGATION TO TAKE THE NEEDS OF THE ISSUER OR OWNERS OF THE MSCI FUNDS OR ANY OTHER PERSON OR ENTITY INTO CONSIDERATION IN DETERMINING, COMPOSING OR CALCULATING THE MSCI INDICES. NONE OF THE MSCI PARTIES IS RESPONSIBLE FOR OR HAS PARTICIPATED IN THE DETERMINATION OF THE TIMING OF, PRICES AT, OR QUANTITIES OF THE MSCI FUNDS TO BE ISSUED OR IN THE DETERMINATION OR CALCULATION OF THE EQUATION BY OR THE CONSIDERATION INTO WHICH THE MSCI FUNDS ARE REDEEMABLE. FURTHER, NONE OF THE MSCI PARTIES HAS ANY OBLIGATION OR LIABILITY TO THE ISSUER OR OWNERS OF THE MSCI FUNDS OR ANY OTHER PERSON OR ENTITY IN CONNECTION WITH THE ADMINISTRATION, MARKETING OR OFFERING OF THE MSCI FUNDS.

ALTHOUGH MSCI SHALL OBTAIN INFORMATION FOR INCLUSION IN OR FOR USE IN THE CALCULATION OF THE MSCI INDICES FROM SOURCES THAT MSCI CONSIDERS RELIABLE, NONE OF THE MSCI PARTIES WARRANTS OR GUARANTEES THE ORIGINALITY, ACCURACY AND/OR THE COMPLETENESS OF ANY MSCI INDEX OR ANY DATA INCLUDED THEREIN. NONE OF THE MSCI PARTIES MAKES ANY WARRANTY, EXPRESS OR IMPLIED, AS TO RESULTS TO BE OBTAINED BY THE ISSUER OF THE MSCI FUNDS, OWNERS OF THE FUNDS, OR ANY OTHER PERSON OR ENTITY, FROM THE USE OF ANY MSCI INDEX OR ANY DATA INCLUDED THEREIN. NONE OF THE MSCI PARTIES SHALL HAVE ANY LIABILITY FOR ANY ERRORS, OMISSIONS OR INTERRUPTIONS OF OR IN CONNECTION WITH ANY MSCI INDEX OR ANY DATA INCLUDED THEREIN. FURTHER, NONE OF THE MSCI PARTIES MAKES ANY EXPRESS OR IMPLIED WARRANTIES OF ANY KIND, AND THE MSCI PARTIES HEREBY EXPRESSLY DISCLAIM ALL WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, WITH RESPECT TO EACH MSCI INDEX AND ANY DATA INCLUDED THEREIN. WITHOUT LIMITING ANY OF THE FOREGOING, IN NO EVENT SHALL ANY OF THE MSCI PARTIES HAVE ANY LIABILITY FOR ANY DIRECT, INDIRECT, SPECIAL, PUNITIVE, CONSEQUENTIAL OR ANY OTHER DAMAGES (INCLUDING LOST PROFITS) EVEN IF NOTIFIED OF THE POSSIBILITY OF SUCH DAMAGES.

The State Street Small/Mid Cap Equity Index Portfolio has been developed solely by the Adviser. The State Street Small/Mid Cap Equity Index Portfolio is not in any way connected to or sponsored, endorsed, sold or promoted by the London Stock Exchange Group plc and its group undertakings (collectively, the “LSE Group”). FTSE Russell is a trading name of certain of the LSE Group companies.

The Index is calculated by or on behalf of FTSE International Limited or its affiliate, agent or partner. The LSE Group does not accept any liability whatsoever to any person arising out of (a) the use of, reliance on or any error in the Index or (b) investment in or operation of the State Street Small/Mid Cap Equity Index Portfolio. The LSE Group makes no claim, prediction, warranty or representation either as to the results to be obtained from the State Street Small/Mid Cap Equity Index Portfolio or the suitability of the Index for the purpose to which it is being put by the Adviser.

For more information about the Portfolios:

The Portfolios' SAI includes additional information about the Portfolios and is incorporated by reference into this document. Additional information about the Portfolios' investments is available in the Portfolios' most recent annual and semi-annual reports to shareholders and in each Portfolio's Form N-CSR filing. In a Portfolio's annual report, you will find a discussion of the market conditions and investment strategies that significantly affected the Portfolio's performance during its last fiscal year. In a Portfolio's Form N-CSR, you will find the Portfolio's annual and semi-annual financial statements. The Portfolios' SAI is available, without charge, upon request. The Portfolios' annual and semi-annual reports are available, without charge, upon request. Shareholders in the Portfolios may make inquiries to the Portfolios to receive such information by calling (877) 521-4083 or the customer service center at the telephone number shown in the accompanying contract prospectus, if applicable. Each Portfolio's Prospectus, SAI, annual and semi-annual reports to shareholders and other information such as each Portfolio's financial statements are available, free of charge, on the Portfolios' website at www.ssga.com.

Reports and other information about the Portfolios are available free of charge on the EDGAR Database on the SEC's Internet site at http://www.sec.gov. Copies of this information also may be obtained, after paying a duplicating fee, by electronic request at the following E-mail address: publicinfo@sec.gov.

SSGA Funds Management, Inc

ONE IRON STREET

BOSTON, MASSACHUSETTS 02210

SSITCFSTATPROThe State Street Institutional Investment Trust's Investment Company Act File Number is 811-09819.

Prospectus

April 30, 2025

State Street Institutional
Investment Trust

State Street Target Retirement 2025 Fund
Class I (SSBRX) Class K (SSBSX) Class R3 (SSAHX)

State Street Target Retirement 2030 Fund
Class I (SSBWX) Class K (SSBYX) Class R3 (SSAJX)

State Street Target Retirement 2035 Fund
Class I (SSCJX) Class K (SSCKX) Class R3 (SSAZX)

State Street Target Retirement 2040 Fund
Class I (SSCNX) Class K (SSCQX) Class R3 (SSAKX)

State Street Target Retirement 2045 Fund
Class I (SSDDX) Class K (SSDEX) Class R3 (SSAOX)

State Street Target Retirement 2050 Fund
Class I (SSDJX) Class K (SSDLX) Class R3 (SSAUX)

State Street Target Retirement 2055 Fund
Class I (SSDOX) Class K (SSDQX) Class R3 (SSAWX)

State Street Target Retirement 2060 Fund
Class I (SSDWX) Class K (SSDYX) Class R3 (SSAYX)

State Street Target Retirement 2065 Fund
Class I (SSFJX) Class K (SSFKX) Class R3 (SSFPX)

State Street Target Retirement 2070 Fund
Class I (SSGQX) Class K (SSGNX) Class R3 (SSGUX)

State Street Target Retirement Fund
Class I (SSFNX) Class K (SSFOX) Class R3 (SSFQX)

The U.S. Securities and Exchange Commission has not approved or disapproved these securities or passed upon the adequacy of this Prospectus. Any representation to the contrary is a criminal offense.

An investment in any of the Funds offered by this Prospectus is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Each Fund may offer multiple classes of shares. This Prospectus covers only the Class I, Class K and Class R3 Shares of the applicable Funds.

TABLE OF CONTENTS

Fund Summaries	4
State Street Target Retirement 2025 Fund	4
State Street Target Retirement 2030 Fund	15
State Street Target Retirement 2035 Fund	26
State Street Target Retirement 2040 Fund	37
State Street Target Retirement 2045 Fund	48
State Street Target Retirement 2050 Fund	59
State Street Target Retirement 2055 Fund	70
State Street Target Retirement 2060 Fund	81
State Street Target Retirement 2065 Fund	92
State Street Target Retirement 2070 Fund	103
State Street Target Retirement Fund	113
Additional Information About Investment Objectives, Principal Strategies and Risks	123
Additional Information About Non-Principal Investment Strategies and Risks	136
Portfolio Holdings Disclosure	138
Management and Organization	139
Shareholder Information	141
Dividends, Distributions and Tax Considerations	150
Financial Intermediary Arrangements	152
Financial Highlights	154
Appendix A – Underlying Funds	188
Index/Trademark Licenses/Disclaimers	193

State Street Target Retirement 2025 Fund

Investment Objective

The investment objective of the State Street Target Retirement 2025 Fund (the “Target Retirement 2025 Fund” or the “Fund”) is to seek capital growth and income over the long term.

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

	Class I	Class K	Class R3
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None	None	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None	None	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

	Class I	Class K	Class R3
Management Fee	0.05%	0.05%	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%	0.00%	0.25%
Other Expenses1	0.27%	0.07%	0.32%
Acquired Fund Fees and Expenses	0.10%	0.10%	0.10%
Total Annual Fund Operating Expenses	0.42%	0.22%	0.72%
Less Fee Waivers and/or Expense Reimbursements2	(0.13%)	(0.13%)	(0.13%)
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	0.29%	0.09%	0.59%

Other Expenses have been restated to reflect current fees for Class I shares.

The Fund's investment adviser, SSGA Funds Management, Inc. (the “Adviser” or “SSGA FM”), is contractually obligated until April 30, 2026 (i) to waive up to the full amount of the advisory fee payable by the Fund, and/or (ii) to reimburse the Fund to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, extraordinary expenses, and distribution, shareholder servicing, and sub-transfer agency fees) exceed 0.09% of average daily net assets on an annual basis. This waiver and/or reimbursement may not be terminated prior to April 30, 2026 except with approval of the Fund's Board of Trustees.

Example:

	1 year	3 years	5 years	10 years
Class I	$30	$122	$222	$517
Class K	$9	$58	$111	$267
Class R3	$60	$217	$388	$882

Portfolio Turnover:

Principal Investment Strategies

SSGA Funds Management, Inc. (“SSGA FM” or the “Adviser”), the investment adviser to the Fund, manages the Target Retirement 2025 Fund using a proprietary asset allocation strategy. The Fund is a “fund of funds” that invests in a combination of mutual funds and ETFs sponsored by the Adviser or its affiliates (the “Underlying Funds”). The Underlying Funds may invest in a wide variety of asset classes, including equity and fixed-income securities of issuers anywhere in the world, including emerging markets investments, and including, among others, high yield, commodity, and real estate investments. The Underlying Funds may invest in obligations of domestic U.S. issuers, non-U.S. issuers, or both.

The Fund is intended for investors expecting to retire around the year 2025 and who are likely to stop making new investments in the Fund at that time. The Fund is designed for an investor who plans to withdraw the value of the investor's account gradually following that date. The Adviser seeks to optimize the Fund's “glide path” for the wealth accumulation, wealth preservation, and income generation phases of retirement planning and includes adjustments in the critical years immediately preceding and following the retirement date. For example, a Fund with a target retirement date far into the future will typically invest a greater portion of its assets in asset classes with higher risk profiles and the potential for higher returns. As the target date for a Fund approaches, the Adviser will adjust the asset allocation and risk profile of the Fund – its glide path – to what is generally seen to be a more conservative approach to reduce (but not to eliminate) risk by increasing the allocation to asset classes that have historically been subject to lower levels of volatility. A fund intended for investors who have already achieved retirement age would typically invest a greater portion of its assets in bonds and cash items, with a relatively smaller allocation to equity securities.

The Underlying Funds employ a wide array of investment styles. For example, the Underlying Funds can buy and sell common stocks of companies of any size, corporate bonds of varying credit quality, U.S. government and agency bonds, mortgage- and asset-backed securities, commodities, real estate and money market instruments. They may hold U.S. or non-U.S. investments. The Underlying Funds may use derivative instruments of any kind, including futures contracts, forward currency contracts, credit default swaps, interest rate swaps and commodities-related derivatives. Derivatives may be used by an Underlying Fund for hedging or risk management purposes, as a substitute for direct investment, or otherwise to seek to enhance the Underlying Fund's total return.

The glide path depicted in the chart below shows how the Fund's strategic target allocations among asset classes are expected generally to place more emphasis on fixed income investments and less on equity investments as the target retirement date approaches.

The glide path shows the Fund's long term strategic target allocations. The Fund's actual allocations may differ. The Adviser periodically reviews the Fund's target asset allocations and may, at any time, in its discretion, change the target asset allocations or deviate from the target asset allocations when it believes doing so is appropriate to pursue the Fund's investment objective. The glide path is presented only as an illustration of how the process of re-allocation occurs as the Fund approaches its target date.

The following table shows the Fund's strategic target allocations to the Underlying Funds as of the date of this Prospectus.

Underlying Funds	Target Retirement 2025 Fund
State Street Equity 500 Index II Portfolio	20.80 %
State Street Small/Mid Cap Equity Index Portfolio	2.73 %
State Street Global All Cap Equity ex-U.S. Index Portfolio	14.85 %
State Street Aggregate Bond Index Portfolio	20.75 %
SPDR Bloomberg 1-10 Year TIPS ETF	18.00 %
SPDR Bloomberg High Yield Bond ETF	7.00 %
SPDR Dow Jones Global Real Estate ETF	5.00 %
SPDR Portfolio Long Term Treasury ETF	0.00 %
SDPR Portfolio Intermediate Term Treasury ETF	0.00 %
SPDR Portfolio Short Term Treasury ETF	5.90 %
SPDR Portfolio Short Term Corporate Bond ETF	1.47 %
SDPR Bloomberg Enhanced Roll Yield Commodity Strategy No K-1 ETF	3.50 %

The Fund's actual allocations are expected to differ over time. The Adviser periodically reviews the Fund's target allocations to underlying investment options and may, at any time, in its discretion, change the target allocations or deviate from the target allocations when it believes doing so is appropriate to pursue the Fund's investment objective. The Adviser may modify the selection of Underlying Funds from time to time, and may invest in other Underlying Funds, including any Underlying Funds that may be created in the future. The table is presented for illustrative purposes only. More current information regarding the Fund's allocations may be available on its website: www.ssga.com.

Principal Risks

The Fund is subject to the following principal risks. You could lose money by investing in the Fund. Certain risks relating to instruments and strategies used in the management of the Fund are placed first. The significance of any specific risk to an investment in the Fund will vary over time, depending on the composition of the Fund's portfolio, market conditions, and other factors. You should read all of the risk information presented below carefully, because any one or more of these risks may result in losses to the Fund. An investment in the Fund is subject to investment risks, including possible loss of principal, is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation (“FDIC”) or any other government agency. The Fund may not achieve its investment objective. An investment in the Fund is not guaranteed, and you may experience losses, including losses near, at, or after the target date. There is no guarantee that the Fund will provide adequate portfolio growth or income at and through your retirement. The Fund is not intended to be a complete investment program, but rather is intended for investment as part of a diversified investment portfolio. Investors should consult their own advisers as to the role of the Fund in their overall investment programs. Except as otherwise stated, references in this section to “the Fund” or “a Fund” may relate to the Fund, one or more Underlying Funds, or both. The risks described below may arise out of the Fund's direct investments or the Fund's investments in one or more of the Underlying Funds. All or a portion of the Underlying Funds are managed pursuant to a passive investment strategy, while the Fund is managed pursuant to an active investment strategy. You will find additional information about each Underlying Fund's risks in its prospectus and SAI.

Asset Allocation Risk: The Fund's investment performance depends upon the successful allocation by the Adviser of the Fund's assets among asset classes, geographical regions, industry sectors, and specific issuers and investments. There is no guarantee that the Adviser's allocation techniques and decisions will produce the desired results.

Risk of Investment in Other Pools: When the Fund invests in another pooled investment vehicle, it is exposed to the risk that the other pool will not perform as expected and is exposed indirectly to all of the risks applicable to an investment in such other pool. The investment policies of the other pool may not be the same as those of the Fund; as a result, an investment in the other pool may be subject to additional or different risks than those to which the Fund is typically subject. The Fund bears its proportionate share of the fees and expenses of any pool in which it invests. The Adviser or an affiliate may serve as investment adviser to a pool in which the Fund may invest, leading to potential conflicts of interest. It is possible that other clients of the Adviser or its affiliates will purchase or sell interests in a pool sponsored or managed by the Adviser or its affiliates at prices and at times more favorable than those at which the Fund does so.

Target Date Assumptions Risk: This is the risk that assumptions and forecasts used by the Adviser in developing the Fund's asset allocation glide path are not in line with actual future investment returns and participant savings activities, which could result in losses near, at, or after the target date year or could result in the Fund not providing adequate income at and through retirement.

Longevity Risk: This is the risk that you will outlive your retirement assets.

Below Investment-Grade Securities Risk: Lower-quality debt securities (“high yield” or “junk” bonds) are considered predominantly speculative, and can involve a substantially greater risk of default than higher quality debt securities. Issuers of lower-quality debt securities may have substantially greater risk of insolvency or bankruptcy than issuers of higher-quality debt securities. They can be illiquid, and their values can have significant volatility and may decline significantly over short periods of time. Lower-quality debt securities tend to be more sensitive to adverse news about the issuer, or the market or economy in general.

Commodities Risk: Commodity prices can have significant volatility, and exposure to commodities can cause the net asset value (“NAV”) of Fund Shares to decline or fluctuate in a rapid and unpredictable manner. A liquid secondary market may not exist for certain commodity investments, which may make it difficult for the Fund to sell them at a desirable price or at the price at which it is carrying them.

expropriation, nationalization, embargoes, and acts of war. The securities of emerging market companies may trade less frequently and in smaller volumes than more widely held securities. Market disruptions or substantial market corrections may limit very significantly the liquidity of securities of certain companies in a particular country or geographic region, or of all companies in the country or region. The Fund may be unable to liquidate its positions in such securities at any time, or at a favorable price, in order to meet the Fund's obligations. These risks are generally greater for investments in frontier market countries, which typically have smaller economies or less developed capital markets than traditional emerging market countries.

Inflation Risk: Inflation risk is the risk that the value of assets or income from investments will be less in the future as inflation decreases the value of money. As inflation increases, the values of a fund's assets can decline. Inflation rates may change frequently and drastically as a result of various factors and the Fund's investments may not keep pace with inflation, which may result in losses to Fund investors or adversely affect the real value of shareholders' investments in the Fund. As such, fixed income securities markets may experience heightened levels of interest rate volatility and liquidity risk.

Inflation-Indexed Securities Risk: The principal amount of an inflation-indexed security typically increases with inflation and decreases with deflation, as measured by a specified index. It is possible that, in a period of declining inflation rates, the Fund could receive at maturity less than the initial principal amount of an inflation-indexed security. Changes in the values of inflation-indexed securities may be difficult to predict, and it is possible that an investment in such securities will have an effect different from that anticipated by the Adviser.

IPO Risk: The Fund may at times have the opportunity to invest in securities offered in initial public offerings (“IPOs”). IPOs involve companies that have no public operating history and therefore entail more risk than established public companies. The prices of securities offered in IPOs can have significant volatility and the Fund may lose money on an investment in such securities. IPO investments in which other clients of the Adviser invest may not be made available to the Fund.

Large Transactions Risk: To the extent a large proportion of the shares of the Fund are held by a small number of shareholders (or a single shareholder), including funds or accounts over which the Adviser has investment discretion, the Fund is subject to the risk that these shareholders will purchase or redeem Fund Shares in large amounts rapidly or unexpectedly, including as a result of an asset allocation decision made by the Adviser. In addition, a large number of shareholders collectively may purchase or redeem Fund shares in large amounts rapidly or unexpectedly (collectively, such transactions are referred to as “large shareholder transactions”). Large shareholder transactions could adversely affect the ability of the Fund to conduct its investment program.

Management Risk: The Fund is actively managed. The Adviser's judgments about the attractiveness, relative value, or potential appreciation of a particular sector, security, commodity or investment strategy may prove to be incorrect, and may cause the Fund to incur losses. There can be no assurance that the Adviser's investment techniques and decisions will produce the desired results.

Modeling Risk: The Adviser uses quantitative models in an effort to enhance returns and manage risk. Any imperfections, errors or limitations in these models could limit any benefit to the Fund from the use of the models, or could result in incorrect outputs or in investment outcomes different from or opposite to those expected or desired by the Adviser. There can be no assurance that the models will behave as expected in all market conditions. In addition, computer programming used to create quantitative models, or the data on which such models operate, might contain one or more errors.

be subject to risks associated with currency controls; expropriation; changes in tax policy; greater market volatility; differing securities market structures; higher transaction costs; and various administrative difficulties, such as delays in clearing and settling portfolio transactions or in receiving payment of dividends. Securities traded on foreign markets may be less liquid (harder to sell) than securities traded domestically. Foreign governments may impose restrictions on the repatriation of capital to the U.S. In addition, to the extent that the Fund buys securities denominated in a foreign currency, there are special risks such as changes in currency exchange rates and the risk that a foreign government could regulate foreign exchange transactions. In addition, to the extent investments are made in a limited number of countries, events in those countries will have a more significant impact on the Fund. Investments in depositary receipts may be less liquid and more volatile than the underlying shares in their primary trading market.

Real Estate Sector Risk: An investment in a real property company may be subject to risks similar to those associated with direct ownership of real estate, including, by way of example, the possibility of declines in the value of real estate, losses from casualty or condemnation, and changes in local and general economic conditions, supply and demand, interest rates, environmental liability, zoning laws, regulatory limitations on rents, property taxes, and operating expenses. Some real property companies have limited diversification because they invest in a limited number of properties, a narrow geographic area, or a single type of property.

REIT Risk: Real estate investment trusts (“REITs”) are subject to the risks associated with investing in the securities of real property companies. In particular, REITs may be affected by changes in the values of the underlying properties that they own or operate. Further, REITs are dependent upon specialized management skills, and their investments may be concentrated in relatively few properties, or in a small geographic area or a single property type. REITs are also subject to heavy cash flow dependency and, as a result, are particularly reliant on the proper functioning of capital markets. A variety of economic and other factors may adversely affect a lessee's ability to meet its obligations to a REIT. In the event of a default by a lessee, the REIT may experience delays in enforcing its rights as a lessor and may incur substantial costs associated in protecting its investments. In addition, a REIT could fail to qualify for favorable regulatory treatment.

Restricted Securities Risk: The Fund may hold securities that have not been registered for sale to the public under the U.S. federal securities laws. There can be no assurance that a trading market will exist at any time for any particular restricted security. Limitations on the resale of these securities may have an adverse effect on their marketability, and may prevent the Fund from disposing of them promptly at reasonable prices. The Fund may have to bear the expense of registering the securities for resale and the risk of substantial delays in effecting the registration. Also, restricted securities may be difficult to value because market quotations may not be readily available, and the securities may have significant volatility.

Small-, Mid- and Micro-Capitalization Securities Risk: The securities of small-, mid- and micro-capitalization companies may be more volatile and may involve more risk than the securities of larger companies. These companies may have limited product lines, markets or financial resources, may lack the competitive strength of larger companies, and may depend on a few key employees. In addition, these companies may have been recently organized and may have little or no track record of success. The securities of smaller companies may trade less frequently and in smaller volumes than more widely held securities. Some securities of smaller issuers may be illiquid or may be restricted as to resale, and their values may have significant volatility. The Fund may be unable to liquidate its positions in such securities at any time, or at a favorable price, in order to meet the Fund's obligations. Returns on investments in securities of small-, mid- and micro-capitalization companies could trail the returns on investments in securities of larger companies.

sional appropriations, and their securities are not issued by the U.S. Treasury, are not supported by the full faith and credit of the U.S. government, and involve increased credit risks.

When-Issued, TBA and Delayed Delivery Securities Risk: The Fund may purchase securities on a when-issued, to-be-announced (“TBA”) or delayed delivery basis and may purchase securities on a forward commitment basis. The purchase price of the securities is typically fixed at the time of the commitment, but delivery and payment can take place a month or more after the date of the commitment. At the time of delivery of the securities, the value may be more or less than the purchase or sale price. Purchase of securities on a when-issued, TBA, delayed delivery, or forward commitment basis may give rise to investment leverage, and may result in increased volatility of the Fund's NAV. Default by, or bankruptcy of, a counterparty to a when-issued, TBA or delayed delivery transaction would expose the Fund to possible losses because of an adverse market action, expenses or delays in connection with the purchase or sale of the pools specified in such transaction. The Financial Industry Regulatory Authority, Inc. (“FINRA”) imposes mandatory margin requirements for certain types of when-issued, delayed delivery or forward commitment transactions (including TBA transactions), with limited exceptions. Such transactions require mandatory collateralization which may increase the cost of such transactions and impose added operational complexity.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund's returns from year-to-year and by showing how the Fund's average annual returns for the periods indicated compared with those of a broad measure of market performance and those of a composite of accounts with similar investment objectives (the “Composite Index”). The Composite Index is a custom composite which comprises each index tracked by the Underlying Funds of the Fund. The S&P 500 Index is a well-known stock market index that includes common stocks of 500 companies from a number of sectors and that measures the performance of the large-cap sector of the market. The bar chart shows how the Class I shares' returns have varied for each full calendar year shown. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (800) 997-7327 or by visiting our website at www.ssga.com.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	13.51%	Q2 2020
Lowest Quarterly Return	-12.49%	Q1 2020

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Ten Years
Class I
Return Before Taxes	8.76 %	5.67 %	6.39 %
Return After Taxes on Distributions	6.56 %	3.86 %	4.86 %
Return After Taxes on Distributions and Sale of Fund Shares	5.76 %	3.91 %	4.59 %
Class K Returns Before Taxes	8.92 %	5.93 %	6.53 %
Class R3 Returns Before Taxes	8.27 %	5.40 %	6.00 %
S&P 500 Index (reflects no deduction for fees, expenses or taxes)	25.02 %	14.53 %	13.10 %
State Street Target Retirement 2025 Composite Index (reflects no deduction for fees, expenses or taxes)	8.84 %	5.96 %	6.61 %

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

The professionals primarily responsible for the day-to-day management of the Fund are Seamus Quinn and Michael Narkiewicz. Mr. Quinn has served as a portfolio manager of the Fund since 2022 and Mr. Narkiewicz has served as a portfolio manager of the Fund since 2018.

Seamus Quinn, CFA, CAIA, is a Principal of the Adviser and a Portfolio Manager in the Investment Solutions Group. He joined the Adviser in 2012.

Michael Narkiewicz is a Vice President of the Adviser and a Senior Portfolio Manager in the Investment Solutions Group. He joined the Adviser in 2013.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Class I
To establish an account	None
To add to an existing account	None
Class K
To establish an account	None
To add to an existing account	None
Class R3
To establish an account	None
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

Written Requests and Wire Transfers. You may purchase or redeem Fund Shares by written request or wire transfer.

Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Intermediary:

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

State Street Target Retirement 2030 Fund

Investment Objective

The investment objective of the State Street Target Retirement 2030 Fund (the “Target Retirement 2030 Fund” or the “Fund”) is to seek capital growth and income over the long term.

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

	Class I	Class K	Class R3
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None	None	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None	None	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

	Class I	Class K	Class R3
Management Fee	0.05%	0.05%	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%	0.00%	0.25%
Other Expenses1	0.27%	0.07%	0.32%
Acquired Fund Fees and Expenses	0.07%	0.07%	0.07%
Total Annual Fund Operating Expenses	0.39%	0.19%	0.69%
Less Fee Waivers and/or Expense Reimbursements2	(0.10%)	(0.10%)	(0.10%)
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	0.29%	0.09%	0.59%

Other Expenses have been restated to reflect current fees for Class I shares.

The Fund's investment adviser, SSGA Funds Management, Inc. (the “Adviser” or “SSGA FM”), is contractually obligated until April 30, 2026 (i) to waive up to the full amount of the advisory fee payable by the Fund, and/or (ii) to reimburse the Fund to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, extraordinary expenses, and distribution, shareholder servicing, and sub-transfer agency fees) exceed 0.09% of average daily net assets on an annual basis. This waiver and/or reimbursement may not be terminated prior to April 30, 2026 except with approval of the Fund's Board of Trustees.

Example:

	1 year	3 years	5 years	10 years
Class I	$30	$115	$209	$483
Class K	$9	$51	$97	$233
Class R3	$60	$211	$374	$849

Portfolio Turnover:

Principal Investment Strategies

SSGA Funds Management, Inc. (“SSGA FM” or the “Adviser”), the investment adviser to the Fund, manages the Target Retirement 2030 Fund using a proprietary asset allocation strategy. The Fund is a “fund of funds” that invests in a combination of mutual funds and ETFs sponsored by the Adviser or its affiliates (the “Underlying Funds”). The Underlying Funds may invest in a wide variety of asset classes, including equity and fixed-income securities of issuers anywhere in the world, including emerging markets investments, and including, among others, high yield, commodity, and real estate investments. The Underlying Funds may invest in obligations of domestic U.S. issuers, non-U.S. issuers, or both.

The Fund is intended for investors expecting to retire around the year 2030 and who are likely to stop making new investments in the Fund at that time. The Fund is designed for an investor who plans to withdraw the value of the investor's account gradually following that date. The Adviser seeks to optimize the Fund's “glide path” for the wealth accumulation, wealth preservation, and income generation phases of retirement planning and includes adjustments in the critical years immediately preceding and following the retirement date. For example, a Fund with a target retirement date far into the future will typically invest a greater portion of its assets in asset classes with higher risk profiles and the potential for higher returns. As the target date for a Fund approaches, the Adviser will adjust the asset allocation and risk profile of the Fund – its glide path – to what is generally seen to be a more conservative approach to reduce (but not to eliminate) risk by increasing the allocation to asset classes that have historically been subject to lower levels of volatility. A fund intended for investors who have already achieved retirement age would typically invest a greater portion of its assets in bonds and cash items, with a relatively smaller allocation to equity securities.

The following table shows the Fund's strategic target allocations to the Underlying Funds as of the date of this Prospectus.

Underlying Funds	Target Retirement 2030 Fund
State Street Equity 500 Index II Portfolio	28.99 %
State Street Small/Mid Cap Equity Index Portfolio	4.51 %
State Street Global All Cap Equity ex-U.S. Index Portfolio	23.07 %
State Street Aggregate Bond Index Portfolio	19.43 %
SPDR Bloomberg 1-10 Year TIPS ETF	9.94 %
SPDR Bloomberg High Yield Bond ETF	6.26 %
SPDR Dow Jones Global Real Estate ETF	2.63 %
SPDR Portfolio Long Term Treasury ETF	4.75 %
SDPR Portfolio Intermediate Term Treasury ETF	0.00 %
SPDR Portfolio Short Term Treasury ETF	0.20 %
SPDR Portfolio Short Term Corporate Bond ETF	0.05 %
SDPR Bloomberg Enhanced Roll Yield Commodity Strategy No K-1 ETF	0.18 %

Principal Risks

Longevity Risk: This is the risk that you will outlive your retirement assets.

sional appropriations, and their securities are not issued by the U.S. Treasury, are not supported by the full faith and credit of the U.S. government, and involve increased credit risks.

When-Issued, TBA and Delayed Delivery Securities Risk: The Fund may purchase securities on a when-issued, to-be-announced (“TBA”) or delayed delivery basis and may purchase securities on a forward commitment basis. The purchase price of the securities is typically fixed at the time of the commitment, but delivery and payment can take place a month or more after the date of the commitment. At the time of delivery of the securities, the value may be more or less than the purchase or sale price. Purchase of securities on a when-issued, TBA, delayed delivery, or forward commitment basis may give rise to investment leverage, and may result in increased volatility of the Fund's NAV. Default by, or bankruptcy of, a counterparty to a when-issued, TBA or delayed delivery transaction would expose the Fund to possible losses because of an adverse market action, expenses or delays in connection with the purchase or sale of the pools specified in such transaction. The Financial Industry Regulatory Authority, Inc. (“FINRA”) imposes mandatory margin requirements for certain types of when-issued, delayed delivery or forward commitment transactions (including TBA transactions), with limited exceptions. Such transactions require mandatory collateralization which may increase the cost of such transactions and impose added operational complexity.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund's returns from year-to-year and by showing how the Fund's average annual returns for the periods indicated compared with those of a broad measure of market performance and those of a composite of accounts with similar investment objectives (the “Composite Index”). The Composite Index is a custom composite which comprises each index tracked by the Underlying Funds of the Fund. The S&P 500 Index is a well-known stock market index that includes common stocks of 500 companies from a number of sectors and that measures the performance of the large-cap sector of the market. The bar chart shows how the Class I shares' returns have varied for each full calendar year shown. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (800) 997-7327 or by visiting our website at www.ssga.com.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	15.28%	Q2 2020
Lowest Quarterly Return	-13.54%	Q1 2020

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Ten Years
Class I
Return Before Taxes	9.80 %	6.44 %	7.02 %
Return After Taxes on Distributions	7.93 %	4.87 %	5.71 %
Return After Taxes on Distributions and Sale of Fund Shares	6.53 %	4.68 %	5.29 %
Class K Returns Before Taxes	9.97 %	6.66 %	7.14 %
Class R3 Returns Before Taxes	9.50 %	6.14 %	6.62 %
S&P 500 Index (reflects no deduction for fees, expenses or taxes)	25.02 %	14.53 %	13.10 %
State Street Target Retirement 2030 Composite Index (reflects no deduction for fees, expenses or taxes)	9.99 %	6.69 %	7.21 %

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

Seamus Quinn, CFA, CAIA, is a Principal of the Adviser and a Portfolio Manager in the Investment Solutions Group. He joined the Adviser in 2012.

Michael Narkiewicz is a Vice President of the Adviser and a Senior Portfolio Manager in the Investment Solutions Group. He joined the Adviser in 2013.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Class I
To establish an account	None
To add to an existing account	None
Class K
To establish an account	None
To add to an existing account	None
Class R3
To establish an account	None
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

Written Requests and Wire Transfers. You may purchase or redeem Fund Shares by written request or wire transfer.

Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Intermediary:

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

State Street Target Retirement 2035 Fund

Investment Objective

The investment objective of the State Street Target Retirement 2035 Fund (the “Target Retirement 2035 Fund” or the “Fund”) is to seek capital growth and income over the long term.

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

	Class I	Class K	Class R3
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None	None	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None	None	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

	Class I	Class K	Class R3
Management Fee	0.05%	0.05%	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%	0.00%	0.25%
Other Expenses1	0.27%	0.07%	0.32%
Acquired Fund Fees and Expenses	0.05%	0.05%	0.05%
Total Annual Fund Operating Expenses	0.37%	0.17%	0.67%
Less Fee Waivers and/or Expense Reimbursements2	(0.08%)	(0.08%)	(0.08%)
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	0.29%	0.09%	0.59%

Other Expenses have been restated to reflect current fees for Class I shares.

The Fund's investment adviser, SSGA Funds Management, Inc. (the “Adviser” or “SSGA FM”), is contractually obligated until April 30, 2026 (i) to waive up to the full amount of the advisory fee payable by the Fund, and/or (ii) to reimburse the Fund to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, extraordinary expenses, and distribution, shareholder servicing, and sub-transfer agency fees) exceed 0.09% of average daily net assets on an annual basis. This waiver and/or reimbursement may not be terminated prior to April 30, 2026 except with approval of the Fund's Board of Trustees.

Example:

	1 year	3 years	5 years	10 years
Class I	$30	$111	$200	$460
Class K	$9	$47	$88	$209
Class R3	$60	$206	$365	$827

Portfolio Turnover:

Principal Investment Strategies

SSGA Funds Management, Inc. (“SSGA FM” or the “Adviser”), the investment adviser to the Fund, manages the Target Retirement 2035 Fund using a proprietary asset allocation strategy. The Fund is a “fund of funds” that invests in a combination of mutual funds and ETFs sponsored by the Adviser or its affiliates (the “Underlying Funds”). The Underlying Funds may invest in a wide variety of asset classes, including equity and fixed-income securities of issuers anywhere in the world, including emerging markets investments, and including, among others, high yield, commodity, and real estate investments. The Underlying Funds may invest in obligations of domestic U.S. issuers, non-U.S. issuers, or both.

The Fund is intended for investors expecting to retire around the year 2035 and who are likely to stop making new investments in the Fund at that time. The Fund is designed for an investor who plans to withdraw the value of the investor's account gradually following that date. The Adviser seeks to optimize the Fund's “glide path” for the wealth accumulation, wealth preservation, and income generation phases of retirement planning and includes adjustments in the critical years immediately preceding and following the retirement date. For example, a Fund with a target retirement date far into the future will typically invest a greater portion of its assets in asset classes with higher risk profiles and the potential for higher returns. As the target date for a Fund approaches, the Adviser will adjust the asset allocation and risk profile of the Fund – its glide path – to what is generally seen to be a more conservative approach to reduce (but not to eliminate) risk by increasing the allocation to asset classes that have historically been subject to lower levels of volatility. A fund intended for investors who have already achieved retirement age would typically invest a greater portion of its assets in bonds and cash items, with a relatively smaller allocation to equity securities.

The following table shows the Fund's strategic target allocations to the Underlying Funds as of the date of this Prospectus.

Underlying Funds	Target Retirement 2035 Fund
State Street Equity 500 Index II Portfolio	33.54 %
State Street Small/Mid Cap Equity Index Portfolio	6.19 %
State Street Global All Cap Equity ex-U.S. Index Portfolio	29.27 %
State Street Aggregate Bond Index Portfolio	15.84 %
SPDR Bloomberg 1-10 Year TIPS ETF	0.50 %
SPDR Bloomberg High Yield Bond ETF	4.79 %
SPDR Dow Jones Global Real Estate ETF	0.13 %
SPDR Portfolio Long Term Treasury ETF	9.75 %
SDPR Portfolio Intermediate Term Treasury ETF	0.00 %
SPDR Portfolio Short Term Treasury ETF	0.00 %
SPDR Portfolio Short Term Corporate Bond ETF	0.00 %
SDPR Bloomberg Enhanced Roll Yield Commodity Strategy No K-1 ETF	0.00 %

Principal Risks

Longevity Risk: This is the risk that you will outlive your retirement assets.

sional appropriations, and their securities are not issued by the U.S. Treasury, are not supported by the full faith and credit of the U.S. government, and involve increased credit risks.

When-Issued, TBA and Delayed Delivery Securities Risk: The Fund may purchase securities on a when-issued, to-be-announced (“TBA”) or delayed delivery basis and may purchase securities on a forward commitment basis. The purchase price of the securities is typically fixed at the time of the commitment, but delivery and payment can take place a month or more after the date of the commitment. At the time of delivery of the securities, the value may be more or less than the purchase or sale price. Purchase of securities on a when-issued, TBA, delayed delivery, or forward commitment basis may give rise to investment leverage, and may result in increased volatility of the Fund's NAV. Default by, or bankruptcy of, a counterparty to a when-issued, TBA or delayed delivery transaction would expose the Fund to possible losses because of an adverse market action, expenses or delays in connection with the purchase or sale of the pools specified in such transaction. The Financial Industry Regulatory Authority, Inc. (“FINRA”) imposes mandatory margin requirements for certain types of when-issued, delayed delivery or forward commitment transactions (including TBA transactions), with limited exceptions. Such transactions require mandatory collateralization which may increase the cost of such transactions and impose added operational complexity.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund's returns from year-to-year and by showing how the Fund's average annual returns for the periods indicated compared with those of a broad measure of market performance and those of a composite of accounts with similar investment objectives (the “Composite Index”). The Composite Index is a custom composite which comprises each index tracked by the Underlying Funds of the Fund. The S&P 500 Index is a well-known stock market index that includes common stocks of 500 companies from a number of sectors and that measures the performance of the large-cap sector of the market. The bar chart shows how the Class I shares' returns have varied for each full calendar year shown. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (800) 997-7327 or by visiting our website at www.ssga.com.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	16.53%	Q2 2020
Lowest Quarterly Return	-15.07%	Q1 2020

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Ten Years
Class I
Return Before Taxes	10.49 %	6.81 %	7.37 %
Return After Taxes on Distributions	8.84 %	5.39 %	6.17 %
Return After Taxes on Distributions and Sale of Fund Shares	6.89 %	5.03 %	5.63 %
Class K Returns Before Taxes	10.62 %	7.08 %	7.54 %
Class R3 Returns Before Taxes	10.05 %	6.55 %	7.00 %
S&P 500 Index (reflects no deduction for fees, expenses or taxes)	25.02 %	14.53 %	13.10 %
State Street Target Retirement 2035 Composite Index (reflects no deduction for fees, expenses or taxes)	10.67 %	7.12 %	7.59 %

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

Seamus Quinn, CFA, CAIA, is a Principal of the Adviser and a Portfolio Manager in the Investment Solutions Group. He joined the Adviser in 2012.

Michael Narkiewicz is a Vice President of the Adviser and a Senior Portfolio Manager in the Investment Solutions Group. He joined the Adviser in 2013.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Class I
To establish an account	None
To add to an existing account	None
Class K
To establish an account	None
To add to an existing account	None
Class R3
To establish an account	None
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

Written Requests and Wire Transfers. You may purchase or redeem Fund Shares by written request or wire transfer.

Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Intermediary:

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

State Street Target Retirement 2040 Fund

Investment Objective

The investment objective of the State Street Target Retirement 2040 Fund (the “Target Retirement 2040 Fund” or the “Fund”) is to seek capital growth and income over the long term.

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

	Class I	Class K	Class R3
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None	None	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None	None	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

	Class I	Class K	Class R3
Management Fee	0.05%	0.05%	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%	0.00%	0.25%
Other Expenses1	0.27%	0.07%	0.32%
Acquired Fund Fees and Expenses	0.03%	0.03%	0.03%
Total Annual Fund Operating Expenses	0.35%	0.15%	0.65%
Less Fee Waivers and/or Expense Reimbursements2	(0.06%)	(0.06%)	(0.06%)
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	0.29%	0.09%	0.59%

Other Expenses have been restated to reflect current fees for Class I shares.

The Fund's investment adviser, SSGA Funds Management, Inc. (the “Adviser” or “SSGA FM”), is contractually obligated until April 30, 2026 (i) to waive up to the full amount of the advisory fee payable by the Fund, and/or (ii) to reimburse the Fund to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, extraordinary expenses, and distribution, shareholder servicing, and sub-transfer agency fees) exceed 0.09% of average daily net assets on an annual basis. This waiver and/or reimbursement may not be terminated prior to April 30, 2026 except with approval of the Fund's Board of Trustees.

Example:

	1 year	3 years	5 years	10 years
Class I	$30	$106	$190	$437
Class K	$9	$42	$79	$186
Class R3	$60	$202	$356	$805

Portfolio Turnover:

Principal Investment Strategies

SSGA Funds Management, Inc. (“SSGA FM” or the “Adviser”), the investment adviser to the Fund, manages the Target Retirement 2040 Fund using a proprietary asset allocation strategy. The Fund is a “fund of funds” that invests in a combination of mutual funds and ETFs sponsored by the Adviser or its affiliates (the “Underlying Funds”). The Underlying Funds may invest in a wide variety of asset classes, including equity and fixed-income securities of issuers anywhere in the world, including emerging markets investments, and including, among others, high yield, commodity, and real estate investments. The Underlying Funds may invest in obligations of domestic U.S. issuers, non-U.S. issuers, or both.

The Fund is intended for investors expecting to retire around the year 2040 and who are likely to stop making new investments in the Fund at that time. The Fund is designed for an investor who plans to withdraw the value of the investor's account gradually following that date. The Adviser seeks to optimize the Fund's “glide path” for the wealth accumulation, wealth preservation, and income generation phases of retirement planning and includes adjustments in the critical years immediately preceding and following the retirement date. For example, a Fund with a target retirement date far into the future will typically invest a greater portion of its assets in asset classes with higher risk profiles and the potential for higher returns. As the target date for a Fund approaches, the Adviser will adjust the asset allocation and risk profile of the Fund – its glide path – to what is generally seen to be a more conservative approach to reduce (but not to eliminate) risk by increasing the allocation to asset classes that have historically been subject to lower levels of volatility. A fund intended for investors who have already achieved retirement age would typically invest a greater portion of its assets in bonds and cash items, with a relatively smaller allocation to equity securities.

The following table shows the Fund's strategic target allocations to the Underlying Funds as of the date of this Prospectus.

Underlying Funds	Target Retirement 2040 Fund
State Street Equity 500 Index II Portfolio	36.16 %
State Street Small/Mid Cap Equity Index Portfolio	7.90 %
State Street Global All Cap Equity ex-U.S. Index Portfolio	32.57 %
State Street Aggregate Bond Index Portfolio	11.39 %
SPDR Bloomberg 1-10 Year TIPS ETF	0.00 %
SPDR Bloomberg High Yield Bond ETF	1.98 %
SPDR Dow Jones Global Real Estate ETF	0.00 %
SPDR Portfolio Long Term Treasury ETF	10.00 %
SDPR Portfolio Intermediate Term Treasury ETF	0.00 %
SPDR Portfolio Short Term Treasury ETF	0.00 %
SPDR Portfolio Short Term Corporate Bond ETF	0.00 %
SDPR Bloomberg Enhanced Roll Yield Commodity Strategy No K-1 ETF	0.00 %

Principal Risks

Longevity Risk: This is the risk that you will outlive your retirement assets.

sional appropriations, and their securities are not issued by the U.S. Treasury, are not supported by the full faith and credit of the U.S. government, and involve increased credit risks.

When-Issued, TBA and Delayed Delivery Securities Risk: The Fund may purchase securities on a when-issued, to-be-announced (“TBA”) or delayed delivery basis and may purchase securities on a forward commitment basis. The purchase price of the securities is typically fixed at the time of the commitment, but delivery and payment can take place a month or more after the date of the commitment. At the time of delivery of the securities, the value may be more or less than the purchase or sale price. Purchase of securities on a when-issued, TBA, delayed delivery, or forward commitment basis may give rise to investment leverage, and may result in increased volatility of the Fund's NAV. Default by, or bankruptcy of, a counterparty to a when-issued, TBA or delayed delivery transaction would expose the Fund to possible losses because of an adverse market action, expenses or delays in connection with the purchase or sale of the pools specified in such transaction. The Financial Industry Regulatory Authority, Inc. (“FINRA”) imposes mandatory margin requirements for certain types of when-issued, delayed delivery or forward commitment transactions (including TBA transactions), with limited exceptions. Such transactions require mandatory collateralization which may increase the cost of such transactions and impose added operational complexity.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund's returns from year-to-year and by showing how the Fund's average annual returns for the periods indicated compared with those of a broad measure of market performance and those of a composite of accounts with similar investment objectives (the “Composite Index”). The Composite Index is a custom composite which comprises each index tracked by the Underlying Funds of the Fund. The S&P 500 Index is a well-known stock market index that includes common stocks of 500 companies from a number of sectors and that measures the performance of the large-cap sector of the market. The bar chart shows how the Class I shares' returns have varied for each full calendar year shown. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (800) 997-7327 or by visiting our website at www.ssga.com.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	17.61%	Q2 2020
Lowest Quarterly Return	-16.52%	Q1 2020

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Ten Years
Class I
Return Before Taxes	11.24 %	7.18 %	7.68 %
Return After Taxes on Distributions	9.75 %	5.82 %	6.52 %
Return After Taxes on Distributions and Sale of Fund Shares	7.31 %	5.36 %	5.92 %
Class K Returns Before Taxes	11.40 %	7.56 %	7.87 %
Class R3 Returns Before Taxes	10.83 %	7.02 %	7.33 %
S&P 500 Index (reflects no deduction for fees, expenses or taxes)	25.02 %	14.53 %	13.10 %
State Street Target Retirement 2040 Composite Index (reflects no deduction for fees, expenses or taxes)	11.47 %	7.58 %	7.94 %

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

Seamus Quinn, CFA, CAIA, is a Principal of the Adviser and a Portfolio Manager in the Investment Solutions Group. He joined the Adviser in 2012.

Michael Narkiewicz is a Vice President of the Adviser and a Senior Portfolio Manager in the Investment Solutions Group. He joined the Adviser in 2013.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Class I
To establish an account	None
To add to an existing account	None
Class K
To establish an account	None
To add to an existing account	None
Class R3
To establish an account	None
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

Written Requests and Wire Transfers. You may purchase or redeem Fund Shares by written request or wire transfer.

Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Intermediary:

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

State Street Target Retirement 2045 Fund

Investment Objective

The investment objective of the State Street Target Retirement 2045 Fund (the “Target Retirement 2045 Fund” or the “Fund”) is to seek capital growth and income over the long term.

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

	Class I	Class K	Class R3
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None	None	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None	None	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

	Class I	Class K	Class R3
Management Fee	0.05%	0.05%	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%	0.00%	0.25%
Other Expenses1	0.28%	0.08%	0.33%
Acquired Fund Fees and Expenses	0.03%	0.03%	0.03%
Total Annual Fund Operating Expenses	0.36%	0.16%	0.66%
Less Fee Waivers and/or Expense Reimbursements2	(0.07%)	(0.07%)	(0.07%)
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	0.29%	0.09%	0.59%

Other Expenses have been restated to reflect current fees for Class I shares.

The Fund's investment adviser, SSGA Funds Management, Inc. (the “Adviser” or “SSGA FM”), is contractually obligated until April 30, 2026 (i) to waive up to the full amount of the advisory fee payable by the Fund, and/or (ii) to reimburse the Fund to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, extraordinary expenses, and distribution, shareholder servicing, and sub-transfer agency fees) exceed 0.09% of average daily net assets on an annual basis. This waiver and/or reimbursement may not be terminated prior to April 30, 2026 except with approval of the Fund's Board of Trustees.

Example:

	1 year	3 years	5 years	10 years
Class I	$30	$109	$195	$449
Class K	$9	$44	$83	$198
Class R3	$60	$204	$361	$816

Portfolio Turnover:

Principal Investment Strategies

SSGA Funds Management, Inc. (“SSGA FM” or the “Adviser”), the investment adviser to the Fund, manages the Target Retirement 2045 Fund using a proprietary asset allocation strategy. The Fund is a “fund of funds” that invests in a combination of mutual funds and ETFs sponsored by the Adviser or its affiliates (the “Underlying Funds”). The Underlying Funds may invest in a wide variety of asset classes, including equity and fixed-income securities of issuers anywhere in the world, including emerging markets investments, and including, among others, high yield, commodity, and real estate investments. The Underlying Funds may invest in obligations of domestic U.S. issuers, non-U.S. issuers, or both.

The Fund is intended for investors expecting to retire around the year 2045 and who are likely to stop making new investments in the Fund at that time. The Fund is designed for an investor who plans to withdraw the value of the investor's account gradually following that date. The Adviser seeks to optimize the Fund's “glide path” for the wealth accumulation, wealth preservation, and income generation phases of retirement planning and includes adjustments in the critical years immediately preceding and following the retirement date. For example, a Fund with a target retirement date far into the future will typically invest a greater portion of its assets in asset classes with higher risk profiles and the potential for higher returns. As the target date for a Fund approaches, the Adviser will adjust the asset allocation and risk profile of the Fund – its glide path – to what is generally seen to be a more conservative approach to reduce (but not to eliminate) risk by increasing the allocation to asset classes that have historically been subject to lower levels of volatility. A fund intended for investors who have already achieved retirement age would typically invest a greater portion of its assets in bonds and cash items, with a relatively smaller allocation to equity securities.

The following table shows the Fund's strategic target allocations to the Underlying Funds as of the date of this Prospectus.

Underlying Funds	Target Retirement 2045 Fund
State Street Equity 500 Index II Portfolio	37.79 %
State Street Small/Mid Cap Equity Index Portfolio	9.79 %
State Street Global All Cap Equity ex-U.S. Index Portfolio	35.17 %
State Street Aggregate Bond Index Portfolio	7.25 %
SPDR Bloomberg 1-10 Year TIPS ETF	0.00 %
SPDR Bloomberg High Yield Bond ETF	0.00 %
SPDR Dow Jones Global Real Estate ETF	0.00 %
SPDR Portfolio Long Term Treasury ETF	10.00 %
SDPR Portfolio Intermediate Term Treasury ETF	0.00 %
SPDR Portfolio Short Term Treasury ETF	0.00 %
SPDR Portfolio Short Term Corporate Bond ETF	0.00 %
SDPR Bloomberg Enhanced Roll Yield Commodity Strategy No K-1 ETF	0.00 %

Principal Risks

Longevity Risk: This is the risk that you will outlive your retirement assets.

sional appropriations, and their securities are not issued by the U.S. Treasury, are not supported by the full faith and credit of the U.S. government, and involve increased credit risks.

When-Issued, TBA and Delayed Delivery Securities Risk: The Fund may purchase securities on a when-issued, to-be-announced (“TBA”) or delayed delivery basis and may purchase securities on a forward commitment basis. The purchase price of the securities is typically fixed at the time of the commitment, but delivery and payment can take place a month or more after the date of the commitment. At the time of delivery of the securities, the value may be more or less than the purchase or sale price. Purchase of securities on a when-issued, TBA, delayed delivery, or forward commitment basis may give rise to investment leverage, and may result in increased volatility of the Fund's NAV. Default by, or bankruptcy of, a counterparty to a when-issued, TBA or delayed delivery transaction would expose the Fund to possible losses because of an adverse market action, expenses or delays in connection with the purchase or sale of the pools specified in such transaction. The Financial Industry Regulatory Authority, Inc. (“FINRA”) imposes mandatory margin requirements for certain types of when-issued, delayed delivery or forward commitment transactions (including TBA transactions), with limited exceptions. Such transactions require mandatory collateralization which may increase the cost of such transactions and impose added operational complexity.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund's returns from year-to-year and by showing how the Fund's average annual returns for the periods indicated compared with those of a broad measure of market performance and those of a composite of accounts with similar investment objectives (the “Composite Index”). The Composite Index is a custom composite which comprises each index tracked by the Underlying Funds of the Fund. The S&P 500 Index is a well-known stock market index that includes common stocks of 500 companies from a number of sectors and that measures the performance of the large-cap sector of the market. The bar chart shows how the Class I shares' returns have varied for each full calendar year shown. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (800) 997-7327 or by visiting our website at www.ssga.com.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	18.68%	Q2 2020
Lowest Quarterly Return	-17.92%	Q1 2020

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Ten Years
Class I
Return Before Taxes	11.84 %	7.69 %	8.04 %
Return After Taxes on Distributions	10.44 %	6.44 %	6.95 %
Return After Taxes on Distributions and Sale of Fund Shares	7.74 %	5.81 %	6.25 %
Class K Returns Before Taxes	12.00 %	7.94 %	8.17 %
Class R3 Returns Before Taxes	11.43 %	7.39 %	7.63 %
S&P 500 Index (reflects no deduction for fees, expenses or taxes)	25.02 %	14.53 %	13.10 %
State Street Target Retirement 2045 Composite Index (reflects no deduction for fees, expenses or taxes)	12.09 %	7.98 %	8.25 %

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

Seamus Quinn, CFA, CAIA, is a Principal of the Adviser and a Portfolio Manager in the Investment Solutions Group. He joined the Adviser in 2012.

Michael Narkiewicz is a Vice President of the Adviser and a Senior Portfolio Manager in the Investment Solutions Group. He joined the Adviser in 2013.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Class I
To establish an account	None
To add to an existing account	None
Class K
To establish an account	None
To add to an existing account	None
Class R3
To establish an account	None
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

Written Requests and Wire Transfers. You may purchase or redeem Fund Shares by written request or wire transfer.

Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Intermediary:

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

State Street Target Retirement 2050 Fund

Investment Objective

The investment objective of the State Street Target Retirement 2050 Fund (the “Target Retirement 2050 Fund” or the “Fund”) is to seek capital growth and income over the long term.

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

	Class I	Class K	Class R3
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None	None	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None	None	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

	Class I	Class K	Class R3
Management Fee	0.05%	0.05%	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%	0.00%	0.25%
Other Expenses1	0.28%	0.08%	0.33%
Acquired Fund Fees and Expenses	0.03%	0.03%	0.03%
Total Annual Fund Operating Expenses	0.36%	0.16%	0.66%
Less Fee Waivers and/or Expense Reimbursements2	(0.07%)	(0.07%)	(0.07%)
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	0.29%	0.09%	0.59%

Other Expenses have been restated to reflect current fees for Class I shares.

The Fund's investment adviser, SSGA Funds Management, Inc. (the “Adviser” or “SSGA FM”), is contractually obligated until April 30, 2026 (i) to waive up to the full amount of the advisory fee payable by the Fund, and/or (ii) to reimburse the Fund to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, extraordinary expenses, and distribution, shareholder servicing, and sub-transfer agency fees) exceed 0.09% of average daily net assets on an annual basis. This waiver and/or reimbursement may not be terminated prior to April 30, 2026 except with approval of the Fund's Board of Trustees.

Example:

	1 year	3 years	5 years	10 years
Class I	$30	$109	$195	$449
Class K	$9	$44	$83	$198
Class R3	$60	$204	$361	$816

Portfolio Turnover:

Principal Investment Strategies

SSGA Funds Management, Inc. (“SSGA FM” or the “Adviser”), the investment adviser to the Fund, manages the Target Retirement 2050 Fund using a proprietary asset allocation strategy. The Fund is a “fund of funds” that invests in a combination of mutual funds and ETFs sponsored by the Adviser or its affiliates (the “Underlying Funds”). The Underlying Funds may invest in a wide variety of asset classes, including equity and fixed-income securities of issuers anywhere in the world, including emerging markets investments, and including, among others, high yield, commodity, and real estate investments. The Underlying Funds may invest in obligations of domestic U.S. issuers, non-U.S. issuers, or both.

The Fund is intended for investors expecting to retire around the year 2050 and who are likely to stop making new investments in the Fund at that time. The Fund is designed for an investor who plans to withdraw the value of the investor's account gradually following that date. The Adviser seeks to optimize the Fund's “glide path” for the wealth accumulation, wealth preservation, and income generation phases of retirement planning and includes adjustments in the critical years immediately preceding and following the retirement date. For example, a Fund with a target retirement date far into the future will typically invest a greater portion of its assets in asset classes with higher risk profiles and the potential for higher returns. As the target date for a Fund approaches, the Adviser will adjust the asset allocation and risk profile of the Fund – its glide path – to what is generally seen to be a more conservative approach to reduce (but not to eliminate) risk by increasing the allocation to asset classes that have historically been subject to lower levels of volatility. A fund intended for investors who have already achieved retirement age would typically invest a greater portion of its assets in bonds and cash items, with a relatively smaller allocation to equity securities.

The following table shows the Fund's strategic target allocations to the Underlying Funds as of the date of this Prospectus.

Underlying Funds	Target Retirement 2050 Fund
State Street Equity 500 Index II Portfolio	38.57 %
State Street Small/Mid Cap Equity Index Portfolio	11.88 %
State Street Global All Cap Equity ex-U.S. Index Portfolio	37.29 %
State Street Aggregate Bond Index Portfolio	2.25 %
SPDR Bloomberg 1-10 Year TIPS ETF	0.00 %
SPDR Bloomberg High Yield Bond ETF	0.00 %
SPDR Dow Jones Global Real Estate ETF	0.00 %
SPDR Portfolio Long Term Treasury ETF	10.00 %
SDPR Portfolio Intermediate Term Treasury ETF	0.00 %
SPDR Portfolio Short Term Treasury ETF	0.00 %
SPDR Portfolio Short Term Corporate Bond ETF	0.00 %
SDPR Bloomberg Enhanced Roll Yield Commodity Strategy No K-1 ETF	0.00 %

Principal Risks

Longevity Risk: This is the risk that you will outlive your retirement assets.

sional appropriations, and their securities are not issued by the U.S. Treasury, are not supported by the full faith and credit of the U.S. government, and involve increased credit risks.

When-Issued, TBA and Delayed Delivery Securities Risk: The Fund may purchase securities on a when-issued, to-be-announced (“TBA”) or delayed delivery basis and may purchase securities on a forward commitment basis. The purchase price of the securities is typically fixed at the time of the commitment, but delivery and payment can take place a month or more after the date of the commitment. At the time of delivery of the securities, the value may be more or less than the purchase or sale price. Purchase of securities on a when-issued, TBA, delayed delivery, or forward commitment basis may give rise to investment leverage, and may result in increased volatility of the Fund's NAV. Default by, or bankruptcy of, a counterparty to a when-issued, TBA or delayed delivery transaction would expose the Fund to possible losses because of an adverse market action, expenses or delays in connection with the purchase or sale of the pools specified in such transaction. The Financial Industry Regulatory Authority, Inc. (“FINRA”) imposes mandatory margin requirements for certain types of when-issued, delayed delivery or forward commitment transactions (including TBA transactions), with limited exceptions. Such transactions require mandatory collateralization which may increase the cost of such transactions and impose added operational complexity.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund's returns from year-to-year and by showing how the Fund's average annual returns for the periods indicated compared with those of a broad measure of market performance and those of a composite of accounts with similar investment objectives (the “Composite Index”). The Composite Index is a custom composite which comprises each index tracked by the Underlying Funds of the Fund. The S&P 500 Index is a well-known stock market index that includes common stocks of 500 companies from a number of sectors and that measures the performance of the large-cap sector of the market. The bar chart shows how the Class I shares' returns have varied for each full calendar year shown. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (800) 997-7327 or by visiting our website at www.ssga.com.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	19.08%	Q2 2020
Lowest Quarterly Return	-18.49%	Q1 2020

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Ten Years
Class I
Return Before Taxes	12.38 %	7.93 %	8.13 %
Return After Taxes on Distributions	11.08 %	6.72 %	7.04 %
Return After Taxes on Distributions and Sale of Fund Shares	8.05 %	6.01 %	6.33 %
Class K Returns Before Taxes	12.56 %	8.28 %	8.32 %
Class R3 Returns Before Taxes	11.98 %	7.74 %	7.77 %
S&P 500 Index (reflects no deduction for fees, expenses or taxes)	25.02 %	14.53 %	13.10 %
State Street Target Retirement 2050 Composite Index (reflects no deduction for fees, expenses or taxes)	12.69 %	8.32 %	8.43 %

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

Seamus Quinn, CFA, CAIA, is a Principal of the Adviser and a Portfolio Manager in the Investment Solutions Group. He joined the Adviser in 2012.

Michael Narkiewicz is a Vice President of the Adviser and a Senior Portfolio Manager in the Investment Solutions Group. He joined the Adviser in 2013.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Class I
To establish an account	None
To add to an existing account	None
Class K
To establish an account	None
To add to an existing account	None
Class R3
To establish an account	None
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

Written Requests and Wire Transfers. You may purchase or redeem Fund Shares by written request or wire transfer.

Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Intermediary:

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

State Street Target Retirement 2055 Fund

Investment Objective

The investment objective of the State Street Target Retirement 2055 Fund (the “Target Retirement 2055 Fund” or the “Fund”) is to seek capital growth and income over the long term.

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

	Class I	Class K	Class R3
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None	None	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None	None	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

	Class I	Class K	Class R3
Management Fee	0.05%	0.05%	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%	0.00%	0.25%
Other Expenses1	0.29%	0.09%	0.34%
Acquired Fund Fees and Expenses	0.03%	0.03%	0.03%
Total Annual Fund Operating Expenses	0.37%	0.17%	0.67%
Less Fee Waivers and/or Expense Reimbursements2	(0.08%)	(0.08%)	(0.08%)
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	0.29%	0.09%	0.59%

Other Expenses have been restated to reflect current fees for Class I shares.

The Fund's investment adviser, SSGA Funds Management, Inc. (the “Adviser” or “SSGA FM”), is contractually obligated until April 30, 2026 (i) to waive up to the full amount of the advisory fee payable by the Fund, and/or (ii) to reimburse the Fund to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, extraordinary expenses, and distribution, shareholder servicing, and sub-transfer agency fees) exceed 0.09% of average daily net assets on an annual basis. This waiver and/or reimbursement may not be terminated prior to April 30, 2026 except with approval of the Fund's Board of Trustees.

Example:

	1 year	3 years	5 years	10 years
Class I	$30	$111	$200	$460
Class K	$9	$47	$88	$209
Class R3	$60	$206	$365	$827

Portfolio Turnover:

Principal Investment Strategies

SSGA Funds Management, Inc. (“SSGA FM” or the “Adviser”), the investment adviser to the Fund, manages the Target Retirement 2055 Fund using a proprietary asset allocation strategy. The Fund is a “fund of funds” that invests in a combination of mutual funds and ETFs sponsored by the Adviser or its affiliates (the “Underlying Funds”). The Underlying Funds may invest in a wide variety of asset classes, including equity and fixed-income securities of issuers anywhere in the world, including emerging markets investments, and including, among others, high yield, commodity, and real estate investments. The Underlying Funds may invest in obligations of domestic U.S. issuers, non-U.S. issuers, or both.

The Fund is intended for investors expecting to retire around the year 2055 and who are likely to stop making new investments in the Fund at that time. The Fund is designed for an investor who plans to withdraw the value of the investor's account gradually following that date. The Adviser seeks to optimize the Fund's “glide path” for the wealth accumulation, wealth preservation, and income generation phases of retirement planning and includes adjustments in the critical years immediately preceding and following the retirement date. For example, a Fund with a target retirement date far into the future will typically invest a greater portion of its assets in asset classes with higher risk profiles and the potential for higher returns. As the target date for a Fund approaches, the Adviser will adjust the asset allocation and risk profile of the Fund – its glide path – to what is generally seen to be a more conservative approach to reduce (but not to eliminate) risk by increasing the allocation to asset classes that have historically been subject to lower levels of volatility. A fund intended for investors who have already achieved retirement age would typically invest a greater portion of its assets in bonds and cash items, with a relatively smaller allocation to equity securities.

The following table shows the Fund's strategic target allocations to the Underlying Funds as of the date of this Prospectus.

Underlying Funds	Target Retirement 2055 Fund
State Street Equity 500 Index II Portfolio	38.81 %
State Street Small/Mid Cap Equity Index Portfolio	12.94 %
State Street Global All Cap Equity ex-U.S. Index Portfolio	38.25 %
State Street Aggregate Bond Index Portfolio	0.00 %
SPDR Bloomberg 1-10 Year TIPS ETF	0.00 %
SPDR Bloomberg High Yield Bond ETF	0.00 %
SPDR Dow Jones Global Real Estate ETF	0.00 %
SPDR Portfolio Long Term Treasury ETF	10.00 %
SDPR Portfolio Intermediate Term Treasury ETF	0.00 %
SPDR Portfolio Short Term Treasury ETF	0.00 %
SPDR Portfolio Short Term Corporate Bond ETF	0.00 %
SDPR Bloomberg Enhanced Roll Yield Commodity Strategy No K-1 ETF	0.00 %

Principal Risks

Longevity Risk: This is the risk that you will outlive your retirement assets.

sional appropriations, and their securities are not issued by the U.S. Treasury, are not supported by the full faith and credit of the U.S. government, and involve increased credit risks.

When-Issued, TBA and Delayed Delivery Securities Risk: The Fund may purchase securities on a when-issued, to-be-announced (“TBA”) or delayed delivery basis and may purchase securities on a forward commitment basis. The purchase price of the securities is typically fixed at the time of the commitment, but delivery and payment can take place a month or more after the date of the commitment. At the time of delivery of the securities, the value may be more or less than the purchase or sale price. Purchase of securities on a when-issued, TBA, delayed delivery, or forward commitment basis may give rise to investment leverage, and may result in increased volatility of the Fund's NAV. Default by, or bankruptcy of, a counterparty to a when-issued, TBA or delayed delivery transaction would expose the Fund to possible losses because of an adverse market action, expenses or delays in connection with the purchase or sale of the pools specified in such transaction. The Financial Industry Regulatory Authority, Inc. (“FINRA”) imposes mandatory margin requirements for certain types of when-issued, delayed delivery or forward commitment transactions (including TBA transactions), with limited exceptions. Such transactions require mandatory collateralization which may increase the cost of such transactions and impose added operational complexity.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund's returns from year-to-year and by showing how the Fund's average annual returns for the periods indicated compared with those of a broad measure of market performance and those of a composite of accounts with similar investment objectives (the “Composite Index”). The Composite Index is a custom composite which comprises each index tracked by the Underlying Funds of the Fund. The S&P 500 Index is a well-known stock market index that includes common stocks of 500 companies from a number of sectors and that measures the performance of the large-cap sector of the market. The bar chart shows how the Class I shares' returns have varied for each full calendar year shown. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (800) 997-7327 or by visiting our website at www.ssga.com.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	19.05%	Q2 2020
Lowest Quarterly Return	-18.45%	Q1 2020

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Ten Years
Class I
Return Before Taxes	12.40 %	7.98 %	8.20 %
Return After Taxes on Distributions	11.15 %	6.88 %	7.17 %
Return After Taxes on Distributions and Sale of Fund Shares	8.04 %	6.07 %	6.39 %
Class K Returns Before Taxes	12.66 %	8.29 %	8.33 %
Class R3 Returns Before Taxes	12.15 %	7.75 %	7.80 %
S&P 500 Index (reflects no deduction for fees, expenses or taxes)	25.02 %	14.53 %	13.10 %
State Street Target Retirement 2055 Composite Index (reflects no deduction for fees, expenses or taxes)	12.84 %	8.36 %	8.45 %

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

Seamus Quinn, CFA, CAIA, is a Principal of the Adviser and a Portfolio Manager in the Investment Solutions Group. He joined the Adviser in 2012.

Michael Narkiewicz is a Vice President of the Adviser and a Senior Portfolio Manager in the Investment Solutions Group. He joined the Adviser in 2013.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Class I
To establish an account	None
To add to an existing account	None
Class K
To establish an account	None
To add to an existing account	None
Class R3
To establish an account	None
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

Written Requests and Wire Transfers. You may purchase or redeem Fund Shares by written request or wire transfer.

Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Intermediary:

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

State Street Target Retirement 2060 Fund

Investment Objective

The investment objective of the State Street Target Retirement 2060 Fund (the “Target Retirement 2060 Fund” or the “Fund”) is to seek capital growth and income over the long term.

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

	Class I	Class K	Class R3
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None	None	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None	None	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

	Class I	Class K	Class R3
Management Fee	0.05%	0.05%	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%	0.00%	0.25%
Other Expenses1	0.31%	0.11%	0.36%
Acquired Fund Fees and Expenses	0.03%	0.03%	0.03%
Total Annual Fund Operating Expenses	0.39%	0.19%	0.69%
Less Fee Waivers and/or Expense Reimbursements2	(0.10%)	(0.10%)	(0.10%)
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	0.29%	0.09%	0.59%

Other Expenses have been restated to reflect current fees for Class I shares.

The Fund's investment adviser, SSGA Funds Management, Inc. (the “Adviser” or “SSGA FM”), is contractually obligated until April 30, 2026 (i) to waive up to the full amount of the advisory fee payable by the Fund, and/or (ii) to reimburse the Fund to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, extraordinary expenses, and distribution, shareholder servicing, and sub-transfer agency fees) exceed 0.09% of average daily net assets on an annual basis. This waiver and/or reimbursement may not be terminated prior to April 30, 2026 except with approval of the Fund's Board of Trustees.

Example:

	1 year	3 years	5 years	10 years
Class I	$30	$115	$209	$483
Class K	$9	$51	$97	$233
Class R3	$60	$211	$374	$849

Portfolio Turnover:

Principal Investment Strategies

SSGA Funds Management, Inc. (“SSGA FM” or the “Adviser”), the investment adviser to the Fund, manages the Target Retirement 2060 Fund using a proprietary asset allocation strategy. The Fund is a “fund of funds” that invests in a combination of mutual funds and ETFs sponsored by the Adviser or its affiliates (the “Underlying Funds”). The Underlying Funds may invest in a wide variety of asset classes, including equity and fixed-income securities of issuers anywhere in the world, including emerging markets investments, and including, among others, high yield, commodity, and real estate investments. The Underlying Funds may invest in obligations of domestic U.S. issuers, non-U.S. issuers, or both.

The Fund is intended for investors expecting to retire around the year 2060 and who are likely to stop making new investments in the Fund at that time. The Fund is designed for an investor who plans to withdraw the value of the investor's account gradually following that date. The Adviser seeks to optimize the Fund's “glide path” for the wealth accumulation, wealth preservation, and income generation phases of retirement planning and includes adjustments in the critical years immediately preceding and following the retirement date. For example, a Fund with a target retirement date far into the future will typically invest a greater portion of its assets in asset classes with higher risk profiles and the potential for higher returns. As the target date for a Fund approaches, the Adviser will adjust the asset allocation and risk profile of the Fund – its glide path – to what is generally seen to be a more conservative approach to reduce (but not to eliminate) risk by increasing the allocation to asset classes that have historically been subject to lower levels of volatility. A fund intended for investors who have already achieved retirement age would typically invest a greater portion of its assets in bonds and cash items, with a relatively smaller allocation to equity securities.

The following table shows the Fund's strategic target allocations to the Underlying Funds as of the date of this Prospectus.

Underlying Funds	Target Retirement 2060 Fund
State Street Equity 500 Index II Portfolio	38.81 %
State Street Small/Mid Cap Equity Index Portfolio	12.94 %
State Street Global All Cap Equity ex-U.S. Index Portfolio	38.25 %
State Street Aggregate Bond Index Portfolio	0.00 %
SPDR Bloomberg 1-10 Year TIPS ETF	0.00 %
SPDR Bloomberg High Yield Bond ETF	0.00 %
SPDR Dow Jones Global Real Estate ETF	0.00 %
SPDR Portfolio Long Term Treasury ETF	10.00 %
SDPR Portfolio Intermediate Term Treasury ETF	0.00 %
SPDR Portfolio Short Term Treasury ETF	0.00 %
SPDR Portfolio Short Term Corporate Bond ETF	0.00 %
SDPR Bloomberg Enhanced Roll Yield Commodity Strategy No K-1 ETF	0.00 %

Principal Risks

Longevity Risk: This is the risk that you will outlive your retirement assets.

sional appropriations, and their securities are not issued by the U.S. Treasury, are not supported by the full faith and credit of the U.S. government, and involve increased credit risks.

When-Issued, TBA and Delayed Delivery Securities Risk: The Fund may purchase securities on a when-issued, to-be-announced (“TBA”) or delayed delivery basis and may purchase securities on a forward commitment basis. The purchase price of the securities is typically fixed at the time of the commitment, but delivery and payment can take place a month or more after the date of the commitment. At the time of delivery of the securities, the value may be more or less than the purchase or sale price. Purchase of securities on a when-issued, TBA, delayed delivery, or forward commitment basis may give rise to investment leverage, and may result in increased volatility of the Fund's NAV. Default by, or bankruptcy of, a counterparty to a when-issued, TBA or delayed delivery transaction would expose the Fund to possible losses because of an adverse market action, expenses or delays in connection with the purchase or sale of the pools specified in such transaction. The Financial Industry Regulatory Authority, Inc. (“FINRA”) imposes mandatory margin requirements for certain types of when-issued, delayed delivery or forward commitment transactions (including TBA transactions), with limited exceptions. Such transactions require mandatory collateralization which may increase the cost of such transactions and impose added operational complexity.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund's returns from year-to-year and by showing how the Fund's average annual returns for the periods indicated compared with those of a broad measure of market performance and those of a composite of accounts with similar investment objectives (the “Composite Index”). The Composite Index is a custom composite which comprises each index tracked by the Underlying Funds of the Fund. The S&P 500 Index is a well-known stock market index that includes common stocks of 500 companies from a number of sectors and that measures the performance of the large-cap sector of the market. The bar chart shows how the Class I shares' returns have varied for each full calendar year shown. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (800) 997-7327 or by visiting our website at www.ssga.com.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	18.98%	Q2 2020
Lowest Quarterly Return	-18.44%	Q1 2020

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Ten Years
Class I
Return Before Taxes	12.57 %	8.10 %	8.22 %
Return After Taxes on Distributions	11.39 %	7.10 %	7.18 %
Return After Taxes on Distributions and Sale of Fund Shares	8.07 %	6.15 %	6.34 %
Class K Returns Before Taxes	12.67 %	8.30 %	8.32 %
Class R3 Returns Before Taxes	12.17 %	7.75 %	7.78 %
S&P 500 Index (reflects no deduction for fees, expenses or taxes)	25.02 %	14.53 %	13.10 %
State Street Target Retirement 2060 Composite Index (reflects no deduction for fees, expenses or taxes)	12.84 %	8.36 %	8.45 %

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

Seamus Quinn, CFA, CAIA, is a Principal of the Adviser and a Portfolio Manager in the Investment Solutions Group. He joined the Adviser in 2012.

Michael Narkiewicz is a Vice President of the Adviser and a Senior Portfolio Manager in the Investment Solutions Group. He joined the Adviser in 2013.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Class I
To establish an account	None
To add to an existing account	None
Class K
To establish an account	None
To add to an existing account	None
Class R3
To establish an account	None
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

Written Requests and Wire Transfers. You may purchase or redeem Fund Shares by written request or wire transfer.

Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Intermediary:

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

State Street Target Retirement 2065 Fund

Investment Objective

The investment objective of the State Street Target Retirement 2065 Fund (the “Target Retirement 2065 Fund” or the “Fund”) is to seek capital growth and income over the long term.

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

	Class I	Class K	Class R3
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None	None	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None	None	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

	Class I	Class K	Class R3
Management Fee	0.05%	0.05%	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%	0.00%	0.25%
Other Expenses1	0.36%	0.16%	0.41%
Acquired Fund Fees and Expenses	0.03%	0.03%	0.03%
Total Annual Fund Operating Expenses	0.44%	0.24%	0.74%
Less Fee Waivers and/or Expense Reimbursements2	(0.15%)	(0.15%)	(0.15%)
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	0.29%	0.09%	0.59%

Other Expenses have been restated to reflect current fees for Class I shares.

The Fund's investment adviser, SSGA Funds Management, Inc. (the “Adviser” or “SSGA FM”), is contractually obligated until April 30, 2026 (i) to waive up to the full amount of the advisory fee payable by the Fund, and/or (ii) to reimburse the Fund to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, extraordinary expenses, and distribution, shareholder servicing, and sub-transfer agency fees) exceed 0.09% of average daily net assets on an annual basis. This waiver and/or reimbursement may not be terminated prior to April 30, 2026 except with approval of the Fund's Board of Trustees.

Example:

	1 year	3 years	5 years	10 years
Class I	$30	$126	$231	$540
Class K	$9	$62	$120	$291
Class R3	$60	$221	$397	$904

Portfolio Turnover:

Principal Investment Strategies

SSGA Funds Management, Inc. (“SSGA FM” or the “Adviser”), the investment adviser to the Fund, manages the Target Retirement 2065 Fund using a proprietary asset allocation strategy. The Fund is a “fund of funds” that invests in a combination of mutual funds and ETFs sponsored by the Adviser or its affiliates (the “Underlying Funds”). The Underlying Funds may invest in a wide variety of asset classes, including equity and fixed-income securities of issuers anywhere in the world, including emerging markets investments, and including, among others, high yield, commodity, and real estate investments. The Underlying Funds may invest in obligations of domestic U.S. issuers, non-U.S. issuers, or both.

The Fund is intended for investors expecting to retire around the year 2065 and who are likely to stop making new investments in the Fund at that time. The Fund is designed for an investor who plans to withdraw the value of the investor's account gradually following that date. The Adviser seeks to optimize the Fund's “glide path” for the wealth accumulation, wealth preservation, and income generation phases of retirement planning and includes adjustments in the critical years immediately preceding and following the retirement date. For example, a Fund with a target retirement date far into the future will typically invest a greater portion of its assets in asset classes with higher risk profiles and the potential for higher returns. As the target date for a Fund approaches, the Adviser will adjust the asset allocation and risk profile of the Fund – its glide path – to what is generally seen to be a more conservative approach to reduce (but not to eliminate) risk by increasing the allocation to asset classes that have historically been subject to lower levels of volatility. A fund intended for investors who have already achieved retirement age would typically invest a greater portion of its assets in bonds and cash items, with a relatively smaller allocation to equity securities.

The following table shows the Fund's strategic target allocations to the Underlying Funds as of the date of this Prospectus.

Underlying Funds	Target Retirement 2065 Fund
State Street Equity 500 Index II Portfolio	38.81 %
State Street Small/Mid Cap Equity Index Portfolio	12.94 %
State Street Global All Cap Equity ex-U.S. Index Portfolio	38.25 %
State Street Aggregate Bond Index Portfolio	0.00 %
SPDR Bloomberg 1-10 Year TIPS ETF	0.00 %
SPDR Bloomberg High Yield Bond ETF	0.00 %
SPDR Dow Jones Global Real Estate ETF	0.00 %
SPDR Portfolio Long Term Treasury ETF	10.00 %
SDPR Portfolio Intermediate Term Treasury ETF	0.00 %
SPDR Portfolio Short Term Treasury ETF	0.00 %
SPDR Portfolio Short Term Corporate Bond ETF	0.00 %
SDPR Bloomberg Enhanced Roll Yield Commodity Strategy No K-1 ETF	0.00 %

Principal Risks

Longevity Risk: This is the risk that you will outlive your retirement assets.

sional appropriations, and their securities are not issued by the U.S. Treasury, are not supported by the full faith and credit of the U.S. government, and involve increased credit risks.

When-Issued, TBA and Delayed Delivery Securities Risk: The Fund may purchase securities on a when-issued, to-be-announced (“TBA”) or delayed delivery basis and may purchase securities on a forward commitment basis. The purchase price of the securities is typically fixed at the time of the commitment, but delivery and payment can take place a month or more after the date of the commitment. At the time of delivery of the securities, the value may be more or less than the purchase or sale price. Purchase of securities on a when-issued, TBA, delayed delivery, or forward commitment basis may give rise to investment leverage, and may result in increased volatility of the Fund's NAV. Default by, or bankruptcy of, a counterparty to a when-issued, TBA or delayed delivery transaction would expose the Fund to possible losses because of an adverse market action, expenses or delays in connection with the purchase or sale of the pools specified in such transaction. The Financial Industry Regulatory Authority, Inc. (“FINRA”) imposes mandatory margin requirements for certain types of when-issued, delayed delivery or forward commitment transactions (including TBA transactions), with limited exceptions. Such transactions require mandatory collateralization which may increase the cost of such transactions and impose added operational complexity.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund's returns from year-to-year and by showing how the Fund's average annual returns for the periods indicated compared with those of a broad measure of market performance and those of a composite of accounts with similar investment objectives (the “Composite Index”). The Composite Index is a custom composite which comprises each index tracked by the Underlying Funds of the Fund. The S&P 500 Index is a well-known stock market index that includes common stocks of 500 companies from a number of sectors and that measures the performance of the large-cap sector of the market. The bar chart shows how the Class I shares' returns have varied for each full calendar year shown. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (800) 997-7327 or by visiting our website at www.ssga.com.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	11.37%	Q4 2023
Lowest Quarterly Return	-15.07%	Q2 2022

100

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Since Inception	Inception Date
Class I			3/30/2020
Return Before Taxes	12.67 %	12.83 %	3/30/2020
Return After Taxes on Distributions	11.85 %	11.74 %	3/30/2020
Return After Taxes on Distributions and Sale of Fund Shares	7.89 %	9.87 %	3/30/2020
Class K Returns Before Taxes	12.75 %	13.02 %	3/30/2020
Class R3 Returns Before Taxes	12.15 %	12.47 %	2/25/2022
S&P 500 Index (reflects no deduction for fees, expenses or taxes)	25.02 %	20.33 %
State Street Target Retirement 2065 Composite Index (reflects no deduction for fees, expenses or taxes)	12.84 %	13.86 %

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

Seamus Quinn, CFA, CAIA, is a Principal of the Adviser and a Portfolio Manager in the Investment Solutions Group. He joined the Adviser in 2012.

Michael Narkiewicz is a Vice President of the Adviser and a Senior Portfolio Manager in the Investment Solutions Group. He joined the Adviser in 2013.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Class I
To establish an account	None
To add to an existing account	None
Class K
To establish an account	None
To add to an existing account	None
Class R3
To establish an account	None
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

101

Written Requests and Wire Transfers. You may purchase or redeem Fund Shares by written request or wire transfer.

Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Intermediary:

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

102

State Street Target Retirement 2070 Fund

Investment Objective

The investment objective of the State Street Target Retirement 2070 Fund (the “Target Retirement 2070 Fund” or the “Fund”) is to seek capital growth and income over the long term.

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

	Class I	Class K	Class R3
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None	None	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None	None	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

	Class I	Class K	Class R3
Management Fee	0.05%	0.05%	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%	0.00%	0.25%
Other Expenses1	0.44%	0.24%	0.49%
Acquired Fund Fees and Expenses	0.03%	0.03%	0.03%
Total Annual Fund Operating Expenses	0.52%	0.32%	0.82%
Less Fee Waivers and/or Expense Reimbursements2	(0.23%)	(0.23%)	(0.23%)
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	0.29%	0.09%	0.59%

Other Expenses have been restated to reflect current fees.

The Fund's investment adviser, SSGA Funds Management, Inc. (the “Adviser” or “SSGA FM”), is contractually obligated until April 30, 2026 (i) to waive up to the full amount of the advisory fee payable by the Fund, and/or (ii) to reimburse the Fund to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, extraordinary expenses, and distribution, shareholder servicing, and sub-transfer agency fees) exceed 0.09% of average daily net assets on an annual basis. This waiver and/or reimbursement may not be terminated prior to April 30, 2026 except with approval of the Fund's Board of Trustees.

Example:

103

	1 year	3 years	5 years	10 years
Class I	$30	$144	$268	$631
Class K	$9	$80	$157	$383
Class R3	$60	$239	$432	$992

Portfolio Turnover:

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund Shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund's performance. From the Fund's commencement of operations on December 31, 2024 to the most recent fiscal year end, the Fund's portfolio turnover rate was 0% of the average value of its portfolio.

Principal Investment Strategies

SSGA Funds Management, Inc. (“SSGA FM” or the “Adviser”), the investment adviser to the Fund, manages the Target Retirement 2070 Fund using a proprietary asset allocation strategy. The Fund is a “fund of funds” that invests in a combination of mutual funds and ETFs sponsored by the Adviser or its affiliates (the “Underlying Funds”). The Underlying Funds may invest in a wide variety of asset classes, including equity and fixed-income securities of issuers anywhere in the world, including emerging markets investments, and including, among others, high yield, commodity, and real estate investments. The Underlying Funds may invest in obligations of domestic U.S. issuers, non-U.S. issuers, or both.

The Fund is intended for investors expecting to retire around the year 2070 and who are likely to stop making new investments in the Fund at that time. The Fund is designed for an investor who plans to withdraw the value of the investor's account gradually following that date. The Adviser seeks to optimize the Fund's “glide path” for the wealth accumulation, wealth preservation, and income generation phases of retirement planning and includes adjustments in the critical years immediately preceding and following the retirement date. For example, a Fund with a target retirement date far into the future will typically invest a greater portion of its assets in asset classes with higher risk profiles and the potential for higher returns. As the target date for the Fund approaches, the Adviser will adjust the asset allocation and risk profile of the Fund – its glide path – to what is generally seen to be a more conservative approach to reduce (but not to eliminate) risk by increasing the allocation to asset classes that have historically been subject to lower levels of volatility. A fund intended for investors who have already achieved retirement age would typically invest a greater portion of its assets in bonds and cash items, with a relatively smaller allocation to equity securities.

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The following table shows the Fund's strategic target allocations to the Underlying Funds as of the date of this Prospectus.

Underlying Funds	Target Retirement 2070 Fund
State Street Equity 500 Index II Portfolio	38.81 %
State Street Small/Mid Cap Equity Index Portfolio	12.94 %
State Street Global All Cap Equity ex-U.S. Index Portfolio	38.25 %
State Street Aggregate Bond Index Portfolio	0.00 %
SPDR Bloomberg 1-10 Year TIPS ETF	0.00 %
SPDR Bloomberg High Yield Bond ETF	0.00 %
SPDR Dow Jones Global Real Estate ETF	0.00 %
SPDR Portfolio Long Term Treasury ETF	10.00 %
SPDR Portfolio Intermediate Term Treasury ETF	0.00
SPDR Portfolio Short Term Treasury ETF	0.00 %
SPDR Portfolio Short Term Corporate Bond ETF	0.00 %
SPDR Bloomberg Enhanced Roll Yield Commodity Strategy No K-1 ETF	0.00 %

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Principal Risks

Longevity Risk: This is the risk that you will outlive your retirement assets.

106

107

108

109

110

sional appropriations, and their securities are not issued by the U.S. Treasury, are not supported by the full faith and credit of the U.S. government, and involve increased credit risks.

When-Issued, TBA and Delayed Delivery Securities Risk: The Fund may purchase securities on a when-issued, to-be-announced (“TBA”) or delayed delivery basis and may purchase securities on a forward commitment basis. The purchase price of the securities is typically fixed at the time of the commitment, but delivery and payment can take place a month or more after the date of the commitment. At the time of delivery of the securities, the value may be more or less than the purchase or sale price. Purchase of securities on a when-issued, TBA, delayed delivery, or forward commitment basis may give rise to investment leverage, and may result in increased volatility of the Fund's NAV. Default by, or bankruptcy of, a counterparty to a when-issued, TBA or delayed delivery transaction would expose the Fund to possible losses because of an adverse market action, expenses or delays in connection with the purchase or sale of the pools specified in such transaction. The Financial Industry Regulatory Authority, Inc. (“FINRA”) imposes mandatory margin requirements for certain types of when-issued, delayed delivery or forward commitment transactions (including TBA transactions), with limited exceptions. Such transactions require mandatory collateralization which may increase the cost of such transactions and impose added operational complexity.

Performance

The Fund has not yet completed a full calendar year of investment operations. Once the Fund has completed a full calendar year of operations, a bar chart and table will be included that will provide some indication of the risks of investing in the Fund by showing the variability of the Fund's returns based on net assets and comparing the Fund's performance to the Index. Current performance information for the Fund is available toll free by calling (800) 997-7327 or by visiting our website at www.ssga.com.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

The professionals primarily responsible for the day-to-day management of the Fund are Seamus Quinn and Michael Narkiewicz. Mr. Quinn has served as a portfolio manager of the Fund since 2024 and Mr. Narkiewicz has served as a portfolio manager of the Fund since 2024.

Seamus Quinn, CFA, CAIA, is a Principal of the Adviser and a Portfolio Manager in the Investment Solutions Group. He joined the Adviser in 2012.

Michael Narkiewicz is a Vice President of the Adviser and a Senior Portfolio Manager in the Investment Solutions Group. He joined the Adviser in 2013.

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Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Class I
To establish an account	None
To add to an existing account	None
Class K
To establish an account	None
To add to an existing account	None
Class R3
To establish an account	None
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

Written Requests and Wire Transfers. You may purchase or redeem Fund Shares by written request or wire transfer.

Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Intermediary:

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

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State Street Target Retirement Fund

Investment Objectives

The investment objective of the State Street Target Retirement Fund (the “Target Retirement Fund” or the “Fund”) is to seek current income and, secondarily, capital growth.

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

	Class I	Class K	Class R3
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None	None	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None	None	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

	Class I	Class K	Class R3
Management Fee	0.05%	0.05%	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%	0.00%	0.25%
Other Expenses1	0.30%	0.10%	0.35%
Acquired Fund Fees and Expenses	0.11%	0.11%	0.11%
Total Annual Fund Operating Expenses	0.46%	0.26%	0.76%
Less Fee Waivers and/or Expense Reimbursements2	(0.17%)	(0.17%)	(0.17%)
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	0.29%	0.09%	0.59%

Other Expenses have been restated to reflect current fees for Class I shares.

The Fund's investment adviser, SSGA Funds Management, Inc. (the “Adviser” or “SSGA FM”), is contractually obligated until April 30, 2026 (i) to waive up to the full amount of the advisory fee payable by the Fund, and/or (ii) to reimburse the Fund to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, extraordinary expenses, and distribution, shareholder servicing, and sub-transfer agency fees) exceed 0.09% of average daily net assets on an annual basis. This waiver and/or reimbursement may not be terminated prior to April 30, 2026 except with approval of the Fund's Board of Trustees.

Example:

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	1 year	3 years	5 years	10 years
Class I	$30	$130	$241	$563
Class K	$9	$66	$129	$314
Class R3	$60	$226	$406	$926

Portfolio Turnover:

Principal Investment Strategies

SSGA Funds Management, Inc. (“SSGA FM” or the “Adviser”), the investment adviser to the Fund, manages the Target Retirement Fund using a proprietary asset allocation strategy. The Fund is a “fund of funds” that invests in a combination of mutual funds and ETFs sponsored by the Adviser or its affiliates (the “Underlying Funds”). The Underlying Funds may invest in a wide variety of asset classes, including equity and fixed-income securities of issuers anywhere in the world, including emerging markets investments, and including, among others, high yield, commodity, and real estate investments. The Underlying Funds may invest in obligations of domestic U.S. issuers, non-U.S. issuers, or both.

The Fund's assets are allocated among the Underlying Funds according to a target asset allocation strategy that emphasizes fixed income, but also includes a smaller allocation to equity and certain other asset classes. The Fund is intended for use as part of an overall investment strategy by an investor who is already in retirement.

The following table shows the Fund's strategic target allocations to the Underlying Funds as of the date of this Prospectus.

Underlying Funds	Target Retirement Fund
State Street Equity 500 Index II Portfolio	14.76 %
State Street Small/Mid Cap Equity Index Portfolio	1.64 %
State Street Global All Cap Equity ex-U.S. Index Portfolio	10.10 %
State Street Aggregate Bond Index Portfolio	20.00 %
SPDR Bloomberg 1-10 Year TIPS ETF	18.00 %
SPDR Bloomberg High Yield Bond ETF	7.00 %
SPDR Dow Jones Global Real Estate ETF	5.00 %
SPDR Portfolio Long Term Treasury ETF	0.00 %
SDPR Portfolio Intermediate Term Treasury ETF	0.00 %
SPDR Portfolio Short Term Treasury ETF	16.00 %
SPDR Portfolio Short Term Corporate Bond ETF	4.00 %
SDPR Bloomberg Enhanced Roll Yield Commodity Strategy No K-1 ETF	3.50 %

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Principal Risks

Longevity Risk: This is the risk that you will outlive your retirement assets.

115

116

117

118

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sional appropriations, and their securities are not issued by the U.S. Treasury, are not supported by the full faith and credit of the U.S. government, and involve increased credit risks.

When-Issued, TBA and Delayed Delivery Securities Risk: The Fund may purchase securities on a when-issued, to-be-announced (“TBA”) or delayed delivery basis and may purchase securities on a forward commitment basis. The purchase price of the securities is typically fixed at the time of the commitment, but delivery and payment can take place a month or more after the date of the commitment. At the time of delivery of the securities, the value may be more or less than the purchase or sale price. Purchase of securities on a when-issued, TBA, delayed delivery, or forward commitment basis may give rise to investment leverage, and may result in increased volatility of the Fund's NAV. Default by, or bankruptcy of, a counterparty to a when-issued, TBA or delayed delivery transaction would expose the Fund to possible losses because of an adverse market action, expenses or delays in connection with the purchase or sale of the pools specified in such transaction. The Financial Industry Regulatory Authority, Inc. (“FINRA”) imposes mandatory margin requirements for certain types of when-issued, delayed delivery or forward commitment transactions (including TBA transactions), with limited exceptions. Such transactions require mandatory collateralization which may increase the cost of such transactions and impose added operational complexity.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund's returns from year-to-year and by showing how the Fund's average annual returns for the periods indicated compared with those of a broad measure of market performance and those of a composite of accounts with similar investment objectives (the “Composite Index”). The Composite Index is a custom composite which comprises each index tracked by the Underlying Funds of the Fund. The S&P 500 Index is a well-known stock market index that includes common stocks of 500 companies from a number of sectors and that measures the performance of the large-cap sector of the market. The bar chart shows how the Class I shares' returns have varied for each full calendar year shown. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (800) 997-7327 or by visiting our website at www.ssga.com.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	8.83%	Q2 2020
Lowest Quarterly Return	-7.91%	Q2 2022

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Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Ten Years
Class I
Return Before Taxes	7.07 %	4.17 %	4.52 %
Return After Taxes on Distributions	5.11 %	2.61 %	3.24 %
Return After Taxes on Distributions and Sale of Fund Shares	4.61 %	2.77 %	3.13 %
Class K Returns Before Taxes	7.26 %	4.44 %	4.65 %
Class R3 Returns Before Taxes	6.88 %	3.96 %	4.14 %
Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)	1.25 %	-0.33 %	1.35 %
State Street Target Retirement Composite Index (reflects no deduction for fees, expenses or taxes)	7.19 %	4.41 %	4.68 %

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

Seamus Quinn, CFA, CAIA, is a Principal of the Adviser and a Portfolio Manager in the Investment Solutions Group. He joined the Adviser in 2012.

Michael Narkiewicz is a Vice President of the Adviser and a Senior Portfolio Manager in the Investment Solutions Group. He joined the Adviser in 2013.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Class I
To establish an account	None
To add to an existing account	None
Class K
To establish an account	None
To add to an existing account	None
Class R3
To establish an account	None
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

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Written Requests and Wire Transfers. You may purchase or redeem Fund Shares by written request or wire transfer.

Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Intermediary:

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

122

Additional Information About Investment Objectives, Principal Strategies and Risks

Investment Objective

State Street Target Retirement Funds

The Target Retirement 2025 Fund, Target Retirement 2030 Fund, Target Retirement 2035 Fund, Target Retirement 2040 Fund, Target Retirement 2045 Fund, Target Retirement 2050 Fund, Target Retirement 2055 Fund, Target Retirement 2060 Fund, Target Retirement 2065 Fund, Target Retirement 2070 Fund and Target Retirement Fund are referred to collectively in this Prospectus as the “Target Retirement Funds” or the “Funds.”

Principal Investment Strategies

The Adviser invests each Target Retirement Fund among Underlying Funds according to a proprietary asset allocation. Each Fund's (except for the Retirement Fund) name refers to the approximate retirement year of the investors for whom the Fund's asset allocation strategy is intended. As the target date for a Fund approaches, the Adviser will adjust the asset allocation and risk profile of the Fund (except for the Retirement Fund) – its glide path – to a what is generally seen to be a more conservative approach to reduce (but not eliminate) risk by increasing the allocation to asset classes that have historically been subject to lower levels of volatility. For example, a Fund with a target retirement date far into the future will typically invest a greater portion of its assets in asset classes with higher risk profiles and the potential for higher returns. By contrast, the Retirement Fund is intended for investors in their retirement years. The Adviser allocates the Fund's assets according to a target asset allocation that emphasizes fixed income funds but also includes an allocation to equity and certain other funds.

When the target asset allocation of another Target Retirement Fund matches the Retirement Fund's target asset allocation, generally five years after the Fund's target retirement date (as shown in the glide path above), it is expected that the Fund will be combined with the Retirement Fund, and the Fund's shareholders will become shareholders of the Retirement Fund. This may be done without a vote of shareholders if the Trustees determine at the time of the proposed combination that combining the Fund with the Retirement Fund is in the best interests of the Fund, the Retirement Fund and their shareholders.

The Adviser intends to manage each Target Retirement Fund according to the Fund's target asset allocation strategy, and does not intend to trade actively among Underlying Funds or to attempt to capture short-term market opportunities as primary activities. The Adviser may modify the target asset allocation strategy or the selection of Underlying Funds for any Target Retirement Fund from time to time, and may invest in other Underlying Funds, including any Underlying Funds that may be created in the future.

Each Target Retirement Fund will bear a pro rata share of its Underlying Funds' expenses. Each Target Retirement Fund also bears all of the risks associated with the investment strategies used by its Underlying Funds.

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The tables below set forth each Target Retirement Fund's current strategic target allocations to the Underlying Funds as of the date of this Prospectus and show how each Fund's allocations among asset classes are expected generally to become more conservative as the target retirement date approaches (i.e., more emphasis on fixed income and less on equity):

Underlying Funds	Retirement	2025	2030	2035	2040	2045
State Street Equity 500 Index II Portfolio	14.76 %	20.80 %	28.99 %	33.54 %	36.16 %	37.79 %
State Street Small/Mid Cap Equity Index Portfolio	1.64 %	2.73 %	4.51 %	6.19 %	7.90 %	9.79 %
State Street Global All Cap Equity ex-U.S. Index Portfolio	10.10 %	14.85 %	23.07 %	29.27 %	32.57 %	35.17 %
State Street Aggregate Bond Index Portfolio	20.00 %	20.75 %	19.43 %	15.84 %	11.39 %	7.25 %
SPDR Bloomberg 1-10 Year TIPS ETF	18.00 %	18.00 %	9.94 %	0.50 %	0.00 %	0.00 %
SPDR Bloomberg High Yield Bond ETF	7.00 %	7.00 %	6.26 %	4.79 %	1.98 %	0.00 %
SPDR Dow Jones Global Real Estate ETF	5.00 %	5.00 %	2.63 %	0.13 %	0.00 %	0.00 %
SPDR Portfolio Long Term Treasury ETF	0.00 %	0.00 %	4.75 %	9.75 %	10.00 %	10.00 %
SDPR Portfolio Intermediate Term Treasury ETF	0.00 %	0.00 %	0.00 %	0.00 %	0.00 %	0.00 %
SPDR Portfolio Short Term Treasury ETF	16.00 %	5.90 %	0.20 %	0.00 %	0.00 %	0.00 %
SPDR Portfolio Short Term Corporate Bond ETF	4.00 %	1.47 %	0.05 %	0.00 %	0.00 %	0.00 %
SPDR Bloomberg Enhanced Roll Yield Commodity Strategy No K-1 ETF	3.50 %	3.50 %	0.18 %	0.00 %	0.00 %	0.00 %

Underlying Funds	2050	2055	2060	2065	2070
State Street Equity 500 Index II Portfolio	38.57 %	38.81 %	38.81 %	38.81 %	38.81 %
State Street Small/Mid Cap Equity Index Portfolio	11.88 %	12.94 %	12.94 %	12.94 %	12.94 %
State Street Global All Cap Equity ex-U.S. Index Portfolio	37.29 %	38.25 %	38.25 %	38.25 %	38.25 %
State Street Aggregate Bond Index Portfolio	2.25 %	0.00 %	0.00 %	0.00 %	0.00 %
SPDR Bloomberg 1-10 Year TIPS ETF	0.00 %	0.00 %	0.00 %	0.00 %	0.00 %
SPDR Bloomberg High Yield Bond ETF	0.00 %	0.00 %	0.00 %	0.00 %	0.00 %
SPDR Dow Jones Global Real Estate ETF	0.00 %	0.00 %	0.00 %	0.00 %	0.00 %
SPDR Portfolio Long Term Treasury ETF	10.00 %	10.00 %	10.00 %	10.00 %	10.00 %
SPDR Portfolio Intermediate Term Treasury ETF	0.00 %	0.00 %	0.00 %	0.00 %	0.00 %
SPDR Portfolio Short Term Treasury ETF	0.00 %	0.00 %	0.00 %	0.00 %	0.00 %
SPDR Portfolio Short Term Corporate Bond ETF	0.00 %	0.00 %	0.00 %	0.00 %	0.00 %
SDPR Bloomberg Enhanced Roll Yield Commodity Strategy No K-1 ETF	0.00 %	0.00 %	0.00 %	0.00 %	0.00 %

The Funds' actual allocations are expected to differ over time. The Adviser periodically reviews each Fund's target allocations to underlying investment options and may, at any time, in its discretion, change the target allocations or deviate from the target allocations when it believes doing so is appropriate to pursue the Fund's investment objective. The Adviser may modify the selection of Underlying Funds from time to time, and may invest in other Underlying Funds, including any Underlying Funds that may be created in the future. The tables are presented for illustrative purposes only.

A brief description of the Underlying Funds can be found in Appendix A. Appendix A lists the Underlying Funds that each Fund may utilize as of the date of this Prospectus.

Additional Information About Risks

The Funds are subject to the following principal risks. The risks are described in alphabetical order and not in the order of importance or potential exposure. Except as otherwise stated, references in this section to “the Fund” or “a Fund” may relate to the Fund, one or more Underlying Funds, or both. The risks described below may arise out of the Fund's direct investments or the Fund's investments in one or more of the Underlying Funds.

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Asset Allocation Risk. A Fund's investment performance depends upon the successful allocation of the Fund's assets among asset classes, geographical regions, industry sectors, and specific issuers and investments. There is no guarantee that a Fund's allocation techniques and decisions will produce the desired results. It is possible to lose money on an investment in a Fund as a result of these allocation decisions.

Below Investment-Grade Securities Risk. Securities rated below investment-grade and unrated securities of comparable credit quality (commonly known as “high-yield” or “junk” bonds) lack strong investment-grade characteristics, are considered predominantly speculative with respect to the issuer's continuing ability to make principal and interest payments, and are subject to greater levels of credit, liquidity and market risk than higher-rated securities. They can involve a substantially greater risk of default than higher-rated securities, and their values can decline significantly over short periods of time. Issuers of lower-quality debt securities may have substantially greater risk of insolvency or bankruptcy than issuers of higher-quality debt securities. In the event the issuer of a debt security held by a Fund defaults on its payments or becomes insolvent or bankrupt, the Fund may not receive the return it was promised on the investment and could lose its entire investment. The lower ratings of junk bonds reflect a greater possibility that actual or perceived adverse changes in the financial condition of the issuer or in general economic conditions, or an unanticipated rise in interest rates, may impair the ability of the issuer to make payments of interest and principal. If this were to occur, the values of such securities held by a Fund may fall substantially and a Fund could lose some or all of the value of its investment. Lower-quality debt securities tend to be more sensitive to adverse news about the issuer, or the market or economy in general, than higher quality debt securities. The market for lower quality debt securities can be less liquid than for higher quality debt securities, especially during periods of recession or general market decline, which could make it difficult at times for a Fund to sell certain securities at prices used in calculating a Fund's NAV. These securities may have significant volatility.

Call/Prepayment Risk. Call/prepayment risk is the risk that an issuer will exercise its right to pay principal on an obligation held by a Fund earlier than expected or required. This may occur, for example, when there is a decline in interest rates, and an issuer of bonds or preferred stock redeems the bonds or stock in order to replace them with obligations on which it is required to pay a lower interest or dividend rate. It may also occur when there is an unanticipated increase in the rate at which mortgages or other receivables underlying mortgage- or asset-backed securities held by a Fund are prepaid. In any such case, a Fund may be forced to invest the prepaid amounts in lower-yielding investments, resulting in a decline in the Fund's income.

Commodities Risk. Commodity prices can have significant volatility, and exposure to commodities can cause the NAV of Fund Shares to decline or fluctuate in a rapid and unpredictable manner. The values of physical commodities may be affected by changes in overall market movements, real or perceived inflationary trends, commodity index volatility, changes in interest rates or currency exchange rates, population growth and changing demographics, international economic, political and regulatory developments, and factors affecting a particular region, industry or commodity, such as drought, floods, or other weather conditions, livestock disease, changes in storage costs, trade embargoes, competition from substitute products, transportation bottlenecks or shortages, fluctuations in supply and demand, war, and tariffs. Also, a liquid secondary market may not exist for certain commodity investments, which may make it difficult for the Fund to sell them at a desirable price or at the price at which it is carrying them. The commodity markets are subject to temporary distortions or other disruptions due to, among other factors, lack of liquidity, the participation of speculators, and government regulation and other actions.

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Fund. Further, a Fund may be subject to “bail-in” risk under applicable law whereby, if required by the financial institution's authority, the financial institution's liabilities could be written down, eliminated or converted into equity or an alternative instrument of ownership. A bail-in of a financial institution may result in a reduction in value of some or all of its securities and, if a Fund holds such securities or has entered into a transaction with such a financial security when a bail-in occurs, such Fund may also be similarly impacted.

Credit Risk. Credit risk is the risk that an issuer, guarantor or liquidity provider of a fixed-income security held by a Fund may be unable or unwilling, or may be perceived (whether by market participants, ratings agencies, pricing services or otherwise) as unable or unwilling, to make timely principal and/or interest payments, or to otherwise honor its obligations. It includes the risk that the security will be downgraded by a credit rating agency; generally, lower credit quality issuers present higher credit risks. An actual or perceived decline in creditworthiness of an issuer of a fixed-income security held by a Fund may result in a decrease in the value of the security. It is possible that the ability of an issuer to meet its obligations will decline substantially during the period when a Fund owns securities of the issuer or that the issuer will default on its obligations or that the obligations of the issuer will be limited or restructured.

Currency Risk. Investments in issuers in different countries are often denominated in currencies other than the U.S. dollar. Changes in the values of those currencies relative to the U.S. dollar may have a positive or negative effect on the values of a Fund's investments denominated in those currencies. The values of other currencies relative to the U.S. dollar may fluctuate in response to, among other factors, interest rate changes, intervention (or failure to intervene) by national governments, central banks, or supranational entities such as the International Monetary Fund, the imposition of currency controls, and other political or regulatory developments. Currency values can decrease significantly both in the short term and over the long term in response to these and other developments. Continuing uncertainty as to the status of the Euro and the Economic and Monetary Union of the European Union (the “EMU”) has created significant volatility in currency and financial markets generally. Any partial or complete dissolution of the EMU, or any continued uncertainty as to its status, could have significant adverse effects on currency and financial markets, and on the values of a Fund's portfolio investments.

Depositary Receipts Risk. American Depositary Receipts (“ADRs”) are typically trust receipts issued by a U.S. bank or trust company that evidence an indirect interest in underlying securities issued by a foreign entity. Global Depositary Receipts (“GDRs”), European Depositary Receipts (“EDRs”), and other types of depositary receipts are typically issued by non-U.S. banks or financial institutions to evidence an interest in underlying securities issued by either a U.S. or a non-U.S. entity. Investments in non-U.S. issuers through ADRs, GDRs, EDRs, and other types of depositary receipts generally involve risks applicable to other types of investments in non-U.S. issuers. Investments in depositary receipts may be less liquid and more volatile than the underlying securities in their primary trading market. If a depositary receipt is denominated in a different currency than its underlying securities, a Fund will be subject to the currency risk of both

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the investment in the depositary receipt and the underlying security. There may be less publicly available information regarding the issuer of the securities underlying a depositary receipt than if those securities were traded directly in U.S. securities markets. Depositary receipts may or may not be sponsored by the issuers of the underlying securities, and information regarding issuers of securities underlying unsponsored depositary receipts may be more limited than for sponsored depositary receipts. The values of depositary receipts may decline for a number of reasons relating to the issuers or sponsors of the depositary receipts, including, but not limited to, insolvency of the issuer or sponsor. Holders of depositary receipts may have limited or no rights to take action with respect to the underlying securities or to compel the issuer of the receipts to take action. The prices of depositary receipts may differ from the prices of securities upon which they are based. To the extent the Fund invests in depositary receipts based on securities included in the Index, such differences in prices may increase index tracking risk.

Emerging Markets Risk. Investments in emerging markets are generally subject to a greater risk of loss than investments in developed markets. This may be due to, among other things, the possibility of greater market volatility, lower trading volume and liquidity, greater risk of expropriation, nationalization, and social, political and economic instability, greater reliance on a few industries, international trade or revenue from particular commodities, less developed accounting, legal and regulatory systems, increased potential for market manipulation, higher levels of inflation, deflation or currency devaluation, greater risk of market shutdown, and more significant governmental limitations on investment policy as compared to those typically found in a developed market. The Public Company Accounting Oversight Board, which regulates auditors of U.S. public companies, is unable to inspect audit work papers in certain foreign countries. Investors in foreign countries often have limited rights and few practical remedies to pursue shareholder claims, including class actions or fraud claims, and the ability of the U.S. Securities and Exchange Commission, the U.S. Department of Justice and other authorities to bring and enforce actions against foreign issuers or foreign persons is limited. In addition, issuers (including governments) in emerging market countries may have less financial stability than in other countries. The securities of emerging market companies may trade less frequently and in smaller volumes than more widely held securities. Market disruptions or substantial market corrections may limit very significantly the liquidity of securities of certain companies in a particular country or geographic region, or of all companies in the country or region. A Fund may be unable to liquidate its positions in such securities at any time, or at a favorable price, in order to meet the Fund's obligations. There is also the potential for unfavorable action such as embargoes and acts of war. As a result, there will tend to be an increased risk of price volatility in investments in emerging market countries, which may be magnified by currency fluctuations relative to the U.S. dollar. Settlement and asset custody practices for transactions in emerging markets may differ from those in developed markets. Such differences may include possible delays in settlement and certain settlement practices, such as delivery of securities prior to receipt of payment, which increase the likelihood of a “failed settlement.” Failed settlements can result in losses. For these and other reasons, investments in emerging markets are often considered speculative.

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the issuer's goods or services. The values of equity securities also may decline due to general industry or market conditions that are not specifically related to a particular company, such as real or perceived adverse economic conditions, changes in the general outlook for corporate earnings, changes in interest or currency rates, or adverse investor sentiment generally. In addition, equity markets tend to move in cycles, which may cause stock prices to fall over short or extended periods of time.

Extension Risk. During periods of rising interest rates, the average life of certain types of securities may be extended because of slower-than-expected principal payments. This may increase the period of time during which an investment earns a below-market interest rate, increase the security's duration and reduce the value of the security. Extension risk may be heightened during periods of adverse economic conditions generally, as payment rates decline due to higher unemployment levels and other factors.

Geographic Focus Risk. The performance of a fund that invests significantly in one or more countries or geographic regions will be closely tied to market, currency, economic, political, environmental, or regulatory conditions and developments in the countries or regions in which the fund invests, and may be more volatile than the performance of a fund that does not invest significantly in such countries or regions.

Income Risk. A Fund's income may decline due to falling interest rates or other factors. Issuers of securities held by a Fund may call or redeem the securities during periods of falling interest rates, and the Fund would likely be required to reinvest in securities paying lower interest rates. If an obligation held by a Fund is prepaid, the Fund may have to reinvest the prepayment in other obligations paying income at lower rates. A reduction in the income earned by a Fund may limit the Fund's ability to achieve its objective.

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a Fund's return and that of the Index. Changes in the composition of the Index and regulatory requirements also may impact a Fund's ability to match the return of the Index. The Adviser may apply one or more “screens” or investment techniques to refine or limit the number or types of issuers included in the Index in which a Fund may invest. Application of such screens or techniques may result in investment performance below that of the Index and may not produce results expected by the Adviser. Index tracking risk may be heightened during times of increased market volatility or other unusual market conditions.

Inflation Risk. Inflation risk is the risk that the value of assets or income from investments will be less in the future as inflation decreases the value of money. As inflation increases, the values of a Fund's assets can decline. Inflation rates may change frequently and drastically as a result of various factors, including unexpected shifts in the domestic or global economy (or expectations that domestic or global economic policies will change), and the Fund's investments may not keep pace with inflation, which may result in losses to Fund investors or adversely affect the real value of shareholders' investments in the Fund. As such, fixed income securities markets may experience heightened levels of interest rate volatility and liquidity risk.

Inflation-Indexed Securities Risk. The principal amount of an inflation-indexed security typically increases with inflation and decreases with deflation, as measured by a specified index. It is possible that, in a period of declining inflation rates, a Fund could receive at maturity less than the initial principal amount of an inflation-indexed security. Although the holders of TIPS receive no less than the par value of the security at maturity, if a Fund purchases U.S. Treasury Inflation-Protected Securities (TIPS) in the secondary market whose principal values have previously been adjusted upward and there is a period of subsequent declining inflation rates, a Fund may receive at maturity less than it invested. Depending on the changes in inflation rates during the period a Fund holds an inflation-indexed security, a Fund may earn less on the security than on a conventional bond. Changes in the values of inflation-indexed securities may be difficult to predict, and it is possible that an investment in such securities will have an effect different from that anticipated by the Adviser. The principal amounts of inflation-indexed securities are typically only adjusted periodically, and changes in the values of the securities may only approximately reflect changes in inflation rates and may occur substantially after the changes in inflation rates in question occur.

Information Technology Sector Risk (principal risk for the Target Retirement 2050 Fund, Target Retirement 2055 Fund, Target Retirement 2060 Fund and Target Retirement 2065 Fund). Market or economic factors impacting information technology companies could have a major effect on the value of the Fund's investments. The value of stocks of information technology companies is particularly vulnerable to rapid changes in technology product cycles, rapid product obsolescence, government regulation and competition, both domestically and internationally, including competition from foreign competitors with lower production costs. Like other technology companies, information technology companies may have limited product lines, markets, financial resources or personnel. Stocks of technology companies and companies that rely heavily on technology, especially those of smaller, less-seasoned companies, tend to be more volatile than the overall market. Information technology companies are heavily dependent on patent and intellectual property rights, the loss or impairment of which may adversely affect profitability. Additionally, companies in the information technology sector may face dramatic and often unpredictable changes in growth rates and competition for the services of qualified personnel.

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IPO Risk. Each Fund may at times have the opportunity to invest in securities offered in initial public offerings (“IPOs”). IPOs involve companies that have no public operating history and therefore entail more risk than established public companies. The prices of securities offered in IPOs can have significant volatility and a Fund may lose money on an investment in such securities. IPOs may not be available to a Fund at all times, and a Fund may not always invest in IPOs offered to it. Investments in IPOs may have a substantial beneficial effect on a Fund's investment performance. A Fund's investment return earned during a period of substantial investment in IPOs may not be sustained during other periods when a Fund makes more limited, or no, investments in IPOs. There can be no assurance that the Funds will have the opportunity to invest in IPOs that are made available to other clients of the Adviser.

Large Transactions Risk. To the extent a large proportion of the shares of a Fund are highly concentrated or held by a small number of shareholders (or a single shareholder), including funds or accounts over which the Adviser has investment discretion, a Fund is subject to the risk that these shareholders will purchase or redeem Fund shares in large amounts rapidly or unexpectedly, including as a result of an asset allocation decision made by the Adviser. In addition, a large number of shareholders collectively may purchase or redeem Fund shares in large amounts rapidly or unexpectedly (collectively, such transactions are referred to as “large shareholder transactions”). Large shareholder transactions could adversely affect the ability of a Fund to conduct its investment program. For example, they could require a Fund to sell portfolio securities or purchase portfolio securities unexpectedly and incur substantial transaction costs and/or accelerate the realization of taxable income and/or gains to shareholders. The effects of taxable income and/or gains resulting from large shareholder transactions would particularly impact non-redeeming shareholders who do not hold their Fund shares in an IRA, 401(k) plan or other tax-advantaged plan. To the extent that such transactions result in short-term capital gains, such gains will generally be taxed at the ordinary income tax rate for shareholders who hold Fund shares in a taxable account. In addition, a Fund may be required to sell its more liquid portfolio investments to meet a large redemption, in which case a Fund's remaining assets may be less liquid, more volatile, and more difficult to price. A Fund may hold a relatively large proportion of its assets in cash in anticipation of large redemptions, diluting its investment returns. A number of circumstances may cause a Fund to experience large redemptions, such as changes in investors' circumstances; changes in the eligibility criteria for a Fund or share class of the Fund; liquidations, reorganizations, repositionings, or other announced Fund events; or changes in investment objectives, strategies, policies, risks, or investment personnel.

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Longevity Risk. This is the risk that you will outlive your retirement assets.

Management Risk. Each Fund is actively managed. The Adviser's judgments about the attractiveness, relative value, or potential appreciation of a particular sector, security, commodity or investment strategy may prove to be incorrect, and may cause a Fund to incur losses. There can be no assurance that the Adviser's investment techniques and decisions will produce the desired results.

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and tax changes also may cause fluctuations in markets and securities prices. Local, regional or global events such as war, military conflicts, acts of terrorism, trade policy changes or disputes, the threat of or actual imposition of tariffs, natural disasters, public health issues, or other events could have a significant impact on a Fund and its investments. Due to the interconnectedness of economies and financial markets throughout the world, if a Fund invests in securities of issuers located in or with significant exposure to countries experiencing economic and financial difficulties, the value and liquidity of the Fund's investments may be negatively affected. A widespread outbreak of an infectious illness and efforts to contain its spread, may result in market volatility, inflation, reduced liquidity of certain instruments, disruption in the trading of certain instruments, and systemic economic weakness. The foregoing could impact a Fund and its investments and result in disruptions to the services provided to a Fund by its service providers.

Modeling Risk. The Adviser uses quantitative models in an effort to enhance returns and manage risk. Any imperfections, errors or limitations in these models could limit any benefit to a Fund from the use of the models, or could result in incorrect outputs or in investment outcomes different from or opposite to those expected or desired by the Adviser. These models may make simplifying assumptions that limit their effectiveness and may draw from historical data that does not adequately identify or reflect factors necessary to an appropriate or useful output. There can be no assurance that the models will behave as expected in all market conditions. In addition, computer programming used to create quantitative models, or the data on which such models operate, might contain one or more errors. Such errors might never be detected, or might be detected only after a Fund has sustained a loss (or reduced performance) related to such errors.

Mortgage-Related and Other Asset-Backed Securities Risk. Investments in mortgage-related and other asset-backed securities are subject to the risk of significant credit downgrades, illiquidity, and defaults to a greater extent than many other types of fixed income investments. The liquidity of mortgage-related and asset-backed securities may change over time. Mortgage-related securities represent a participation in, or are secured by, mortgage loans. Other asset-backed securities are typically structured like mortgage-related securities, but instead of mortgage loans or interests in mortgage loans, the underlying assets may include, for example, items such as motor vehicle installment sales or installment loan contracts, leases on various types of real and personal property, and receivables from credit card agreements. During periods of falling interest rates, mortgage-related and other asset-backed securities, which typically provide the issuer with the right to prepay the security prior to maturity, may be prepaid, which may result in a Fund having to reinvest the proceeds in other investments at lower interest rates. During periods of rising interest rates, the average life of mortgage-related and other asset-backed securities may extend because of slower-than expected principal payments. This may lock in a below market interest rate, increase the security's duration and interest rate sensitivity, and reduce the value of the security. As a result, mortgage-related and other asset-backed securities may have less potential for capital appreciation during periods of declining interest rates than other debt securities of comparable maturities, although they may have a similar risk of decline in market values during periods of rising interest rates. Prepayment rates are difficult to predict and the potential impact of prepayments on the value of a mortgage-related or other asset-backed security depends on the terms of the instrument and can result in significant volatility. The price of a mortgage-related or other asset-backed security also depends on the credit quality and adequacy of the underlying assets or collateral. Mortgage-related or other asset-backed securities issued by non-governmental issuers (such as commercial banks, savings and loan institutions, private mortgage insurance companies, mortgage bankers and other secondary market issuers) will generally entail greater credit risk than obligations guaranteed by the U.S. government. Defaults on the underlying assets, if any, may impair the value of a mortgage-related or other asset-backed security. For some asset-backed securities in which a Fund invest, such as those backed by credit card receivables, the underlying cash flows may not be supported

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by a security interest in a related asset. Moreover, the values of mortgage-related and other asset-backed securities may be substantially dependent on the servicing of the underlying asset pools, and are therefore subject to risks associated with the negligence or malfeasance by their servicers and to the credit risk of their servicers. In certain situations, the mishandling of related documentation may also affect the rights of securities holders in and to the underlying collateral. There may be legal and practical limitations on the enforceability of any security interest granted with respect to underlying assets, or the value of the underlying assets, if any, may be insufficient if the issuer defaults.

Non-U.S. Securities Risk. Investments in securities of non-U.S. issuers (including depositary receipts) entail risks not typically associated with investing in securities of U.S. issuers. Similar risks may apply to securities traded on a U.S. securities exchange that are issued by entities with significant exposure to non-U.S. countries. In certain countries, legal remedies available to investors may be more limited than those available with regard to U.S. investments. Because non-U.S. securities are typically denominated and traded in currencies other than the U.S. dollar, the value of the Fund's assets, to the extent they are non-U.S. dollar denominated, may be affected favorably or unfavorably by currency exchange rates, exchange control regulations, and restrictions or prohibitions on the repatriation of non-U.S. currencies. Income and gains with respect to investments in certain countries may be subject to withholding and other taxes. There may be less information publicly available about a non-U.S. entity than about a U.S. entity, and many non-U.S. entities are not subject to accounting, auditing, and financial reporting standards, regulatory framework and practices comparable to those in the United States. The securities of some non-U.S. entities are less liquid and at times more volatile than securities of comparable U.S. entities, and could become subject to sanctions or embargoes that adversely affect a Fund's investment. Non-U.S. transaction costs, such as brokerage commissions and custody costs may be higher than in the U.S. In addition, there may be a possibility of nationalization or expropriation of assets, imposition of currency exchange controls, confiscatory taxation, and diplomatic developments that could adversely affect the values of a Fund's investments in certain non-U.S. countries. Investments in securities of non-U.S. issuers also are subject to foreign political and economic risk not associated with U.S. investments, meaning that political events (civil unrest, national elections, changes in political conditions and foreign relations, imposition of exchange controls and repatriation restrictions), social and economic events (labor strikes, rising inflation) and natural disasters occurring in a country where a Fund invests could cause the Fund's investments to experience gains or losses. In addition, the threat of or actual imposition of tariffs may adversely impact the price of non-U.S. securities.

Real Estate Sector Risk. There are special risks associated with investment in securities of companies engaged in real property markets, including without limitation Real estate investment trusts (“REITs”) and real estate operating companies. An investment in a real property company may be subject to risks similar to those associated with direct ownership of real estate, including, by way of example, the possibility of declines in the value of real estate, losses from casualty or condemnation, and changes in local and general economic conditions, supply and demand, interest rates, environmental liability, zoning laws, regulatory limitations on rents, property taxes, and operating expenses. An investment in a real property company is subject to additional risks, such as poor performance by the manager of the real property company, adverse changes in tax laws, difficulties in valuing and disposing of real estate, and the effect of general declines in stock prices. Some real property companies have limited diversification because they invest in a limited number of properties, a narrow geographic area, or a single type of property. Also, the organizational documents of a real property company may contain provisions that make changes in control of the company difficult and time-consuming. As a shareholder in a real property company, a Fund, and indirectly a Fund's shareholders, would bear their ratable shares of the real property company's expenses and would at the same time continue to pay their own fees and expenses.

REIT Risk. REITs are subject to the risks associated with investing in the securities of real property companies. In particular, REITs may be affected by changes in the values of the underlying properties that they own or operate. Further, REITs are dependent upon specialized management skills, and their investments may be concentrated in relatively few properties, or in a small geographic area or a single property type. REITs are also subject to heavy cash flow dependency and, as a result, are particularly reliant on the proper functioning of capital markets, as well as defaults by borrowers and self-liquidation. A variety of economic and other factors may adversely affect a lessee's ability to meet its obligations to a REIT. In the event of a default by a lessee, the REIT may experience delays in enforcing its rights as a lessor

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and may incur substantial costs associated with protecting its investments. In addition, a REIT could possibly fail to qualify for favorable tax treatment under the Internal Revenue Code of 1986, as amended (the “Code”), or to maintain its exemptions from registration under the U.S. Investment Company Act of 1940, as amended (the “1940 Act”), which could have adverse consequences for a Fund. Investments in REITs are also subject to the risks affecting equity markets generally.

Reinvestment Risk. Income from a Fund's portfolio may decline when the Fund invests the proceeds from investment income, sales of portfolio securities or matured, traded or called debt obligations. For instance, during periods of declining interest rates, an issuer of debt obligations may exercise an option to redeem securities prior to maturity, forcing a Fund to reinvest the proceeds in lower-yielding securities. A decline in income received by a Fund from its investments is likely to have a negative effect on the yield and total return of the Fund Shares.

Restricted Securities Risk. A Fund may hold securities that have not been registered for sale to the public under the U.S. federal securities laws pursuant to an exemption from registration. These securities may be less liquid than securities registered for sale to the general public. The liquidity of a restricted security may be affected by a number of factors, including, among others: (i) the creditworthiness of the issuer; (ii) the frequency of trades and quotes for the security; (iii) the number of dealers willing to purchase or sell the security and the number of other potential purchasers; (iv) dealer undertakings to make a market in the security; (v) the nature of any legal restrictions governing trading in the security; and (vi) the nature of the security and the nature of marketplace trades. There can be no assurance that a liquid trading market will exist at any time for any particular restricted security. Also, restricted securities may be difficult to value because market quotations may not be readily available, and the securities may have significant volatility.

Risk of Investment in Other Pools. When a Fund invests in another pooled investment vehicle, it is exposed to the risk that the other pool will not perform as expected. A Fund is exposed indirectly to all of the risks applicable to an investment in such other pool. In addition, lack of liquidity in the underlying pool could result in its value being more volatile than the underlying portfolio of securities, and may limit the ability of a Fund to sell or redeem its interest in the pool at a time or at a price it might consider desirable. The investment policies and limitations of the other pool may not be the same as those of the Fund; as a result, the Fund may be subject to additional or different risks, or may achieve a reduced investment return, as a result of its investment in another pool. If a pool is an exchange-traded fund or other product traded on a securities exchange or otherwise actively traded, its shares may trade at a premium or discount to their NAV, an effect that might be more pronounced in less liquid markets. A Fund bears its proportionate share of the fees and expenses of any pool in which it invests. The Adviser or an affiliate may serve as investment adviser to a pool in which the Fund may invest, leading to potential conflicts of interest. For example, the Adviser or its affiliates may receive fees based on the amount of assets invested in the pool. Investment by a Fund in the pool may be beneficial to the Adviser or an affiliate in the management of the pool, by helping to achieve economies of scale or enhancing cash flows. Due to this and other factors, the Adviser may have an incentive to invest a Fund's assets in a pool sponsored or managed by the Adviser or its affiliates in lieu of investments by the Fund directly in portfolio securities, or may have an incentive to invest in the pool over a pool sponsored or managed by others. Similarly, the Adviser may have an incentive to delay or decide against the sale of interests held by a Fund in a pool sponsored or managed by the Adviser or its affiliates. It is possible that other clients of the Adviser or its affiliates will purchase or sell interests in a pool sponsored or managed by the Adviser or its affiliates at prices and at times more favorable than those at which a Fund does so.

Settlement Risk. Markets in different countries have different clearance and settlement procedures and in certain markets there have been times when settlements have been unable to keep pace with the volume of transactions. Delays in settlement may increase credit risk to a Fund, limit the ability of a Fund to reinvest the proceeds of a sale of securities, hinder the ability of a Fund to lend its portfolio securities, and potentially subject a Fund to penalties for its failure to deliver to on-purchasers of securities whose delivery to a Fund was delayed. Delays in the settlement of securities purchased by a Fund may limit the ability of a Fund to sell those securities at times and prices it considers desirable, and may subject a Fund to losses and costs due to its own inability to settle with subsequent purchasers of the securities from it. A Fund may be required to borrow monies it had otherwise expected to receive in connection with the settlement of securities sold by it, in order to meet its obligations to others. Limits on the ability of a Fund to purchase or sell securities due to settlement delays could increase any variance between a Fund's performance and that of its benchmark index.

Small-, Mid- and Micro-Capitalization Securities Risk. The securities of small-, mid- and micro-capitalization companies may be more volatile and may involve more risk than the securities of larger companies. These companies may have limited product lines, markets or financial resources, may lack the competitive strength of larger companies, and may

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depend on a few key employees. In addition, these companies may have been recently organized and may have little or no track record of success. The securities of smaller companies may trade less frequently and in smaller volumes than more widely held securities. The prices of these securities may fluctuate more sharply than those of other securities, and a Fund may experience some difficulty in establishing or closing out positions in these securities at prevailing market prices. There may be less publicly available information about the issuers of these securities or less market interest in these securities than in the case of larger companies, both of which can cause significant price volatility. Some securities of smaller issuers may be illiquid or may be restricted as to resale. A Fund may be unable to liquidate its positions in such securities at any time, or at a favorable price, in order to meet a Fund's obligations. Returns on investments in securities of small-, mid- and micro-capitalization companies could trail the returns on investments in securities of larger companies.

Target Date Assumption Risk. This is the risk that assumptions and forecasts used by SSGA FM in developing the Fund's asset allocation glide path are not in line with actual future investment returns and participant savings activities, which could result in losses near, at, or after the target date year or could result in the Fund not providing adequate income at and through retirement.

U.S. Government Securities Risk. U.S. government securities, such as Treasury bills, notes and bonds and mortgage-backed securities guaranteed by the Government National Mortgage Association (“Ginnie Mae”), are supported by the full faith and credit of the United States; others are supported by the right of the issuer to borrow from the U.S. Treasury; others are supported by the discretionary authority of the U.S. government to purchase the agency's obligations; and still others are supported only by the credit of the issuing agency, instrumentality, or enterprise. Although U.S. government-sponsored enterprises such as the Federal Home Loan Mortgage Corporation (“Freddie Mac”) and the Federal National Mortgage Association (“Fannie Mae”) may be chartered or sponsored by Congress, they are not funded by Congressional appropriations, and their securities are not issued by the U.S. Treasury nor supported by the full faith and credit of the U.S. government. There is no assurance that the U.S. government would provide financial support to its agencies and instrumentalities if not required to do so. In addition, certain governmental entities have been subject to regulatory scrutiny regarding their accounting policies and practices and other concerns that may result in legislation, changes in regulatory oversight and/or other consequences that could adversely affect the credit quality, availability, or investment character of securities issued by these entities. The value and liquidity of U.S. government securities may be affected adversely by changes in the ratings of those securities. Securities issued by the U.S. Treasury historically have been considered to present minimal credit risk. The downgrade in the long-term U.S. credit rating by at least two major rating agencies has introduced greater uncertainty about the ability of the U.S. to repay its obligations. Further credit rating downgrades or a U.S. credit default could decrease the value and increase the volatility of a Fund's investments.

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vices stated that its decision was prompted by its view on the rising public debt burden and its perception of greater policymaking uncertainty. Fitch also downgraded its rating of U.S. Treasury securities from AAA to AA+ in August 2023 citing increasing government debt and erosion in confidence regarding governance of fiscal matters as a result of repeated political standoffs related to debt limit approvals. A downgrade of the ratings of U.S. government debt obligations, which are often used as a benchmark for other borrowing arrangements, could result in higher interest rates for individual and corporate borrowers, cause disruptions in the international bond markets and have a substantial negative effect on the U.S. economy. Any additional downgrades of U.S. Treasury securities from ratings agencies may cause the value of a Fund's U.S. Treasury obligations to decline. In recent years, impasses in Congress regarding the federal budget have caused temporary Federal government shutdowns. While Congress has temporarily suspended the debt limit from time to time, the risks that the U.S. government will not adopt a long-term budget or deficit reduction plan, of one or more additional Federal government shutdowns or of future failures to not increase the Federal government's debt limit, may affect investor and consumer confidence and may adversely impact financial markets and the broader economy, perhaps suddenly and to a significant degree.

When-Issued, TBA and Delayed Delivery Securities Risk. A Fund may purchase securities on a when-issued, to be announced (“TBA”) or delayed delivery basis and may purchase securities on a forward commitment basis. The purchase price of the securities is typically fixed at the time of the commitment, but delivery and payment can take place a month or more after the date of the commitment. The prices of the securities so purchased or sold are subject to market fluctuations. At the time of delivery of the securities, the value may be more or less than the purchase or sale price. Purchase of securities on a when-issued, TBA, delayed delivery, or forward commitment basis may give rise to investment leverage, and may result in increased volatility of a Fund's net asset value. Default by, or bankruptcy of, a counterparty to a when-issued, TBA or delayed delivery transaction would expose a Fund to possible losses because of an adverse market action, expenses or delays in connection with the purchase or sale of the pools specified in such transaction. The Financial Industry Regulatory Authority, Inc. (“FINRA”) imposes mandatory margin requirements for certain types of when-issued, delayed delivery or forward commitment transactions (including TBA transactions), with limited exceptions. Such transactions require mandatory collateralization which may increase the cost of such transactions and impose added operational complexity.

Additional Information About Non-Principal Investment Strategies and Risks

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Cybersecurity Risk. With the increased use of technologies such as the Internet and the dependence on computer systems to perform business and operational functions, funds (such as the Funds) and their service providers (including the Adviser) may be prone to operational and information security risks resulting from cyber-attacks and/or technological malfunctions. Furthermore, geopolitical tensions may have increased the scale and sophistication of deliberate cybersecurity attacks, particularly those from nation-states or from entities with nation-state backing. In general, cyber-attacks are deliberate, but unintentional events may have similar effects. Cyber-attacks include, among others, stealing or corrupting data maintained online or digitally, preventing legitimate users from accessing information or services on a website, releasing confidential information without authorization, and causing operational disruption. Successful cyber-attacks against, or security breakdowns of, a Fund, the Adviser or a custodian, transfer agent, or other affiliated or third-party service provider may adversely affect a Fund or its shareholders. For instance, cyber-attacks or technical malfunctions may interfere with the processing of shareholder or other transactions, affect a Fund's ability to calculate its NAV, cause the release of private shareholder information or confidential Fund information, impede trading, cause reputational damage, and subject a Fund to regulatory fines, penalties or financial losses, reimbursement or other compensation costs, and additional compliance costs. Cyber-attacks or technical malfunctions may render records of Fund assets and transactions, shareholder ownership of Fund Shares, and other data integral to the functioning of a Fund inaccessible or inaccurate or incomplete. A Fund may also incur substantial costs for cybersecurity risk management in order to prevent cyber incidents in the future. A Fund and its shareholders could be negatively impacted as a result. While the Adviser has established business continuity plans and systems designed to minimize the risk of cyber-attacks through the use of technology, processes and controls, there are inherent limitations in such plans and systems, including the possibility that certain risks have not been identified, given the evolving nature of this threat. The use of artificial intelligence (“AI”) and machine learning could exacerbate these risks or result in cyber security incidents that implicate personal data. Each Fund relies on third-party service providers for many of its day-to-day operations, and will be subject to the risk that the protections and protocols implemented by those service providers will be ineffective to protect the Fund from cyber-attack. The Adviser does not control the cybersecurity plans and systems put in place by third-party service providers, and such third-party service providers may have limited indemnification obligations to the Adviser or the Funds. Similar types of cybersecurity risks or technical malfunctions also are present for issuers of securities in which each Fund invest, which could result in material adverse consequences for such issuers, and may cause a Fund's investment in such securities to lose value.

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Money Market Fund Investment Risk. An investment in a money market fund is not a deposit of any bank and is not insured or guaranteed by the FDIC or any other government agency. Certain money market funds seek to preserve the value of their shares at $1.00 per share, although there can be no assurance that they will do so, and it is possible to lose money by investing in such a money market fund. A major or unexpected change in interest rates or a decline in the credit quality of an issuer or entity providing credit support, an inactive trading market for money market instruments, or adverse market, economic, industry, political, regulatory, geopolitical, and other conditions could cause the share price of such a money market fund to fall below $1.00. It is possible that such a money market fund will issue and redeem shares at $1.00 per share at times when the fair value of the money market fund's portfolio per share is more or less than $1.00. The SEC has adopted amendments to money market fund regulation that, among other things, increase the daily and weekly liquid asset requirements. Such amendments may limit the Funds' investment flexibility and reduce its ability to generate returns. None of State Street Corporation, State Street Bank and Trust Company (“State Street”), State Street Global Advisors, Inc. (“SSGA”), SSGA Funds Management, Inc. or their affiliates (“State Street Entities”) guarantee the value of an investment in a money market fund at $1.00 per share. Investors should have no expectation of capital support to a money market fund from State Street Entities. Other money market funds price and transact at a “floating” NAV that will fluctuate along with changes in the market-based value of fund assets. Shares sold utilizing a floating NAV may be worth more or less than their original purchase price. Recent changes in the regulation of money market funds may affect the operations and structures of money market funds. A money market fund may be permitted or required to impose redemption fees during times of market stress.

Temporary Defensive Positions. In response to actual or perceived adverse market, economic, political, or other conditions, a Fund may (but will not necessarily), without notice, depart from its principal investment strategies by temporarily investing for defensive purposes. Temporary defensive positions may include, but are not limited to, cash, cash equivalents, U.S. government securities, repurchase agreements collateralized by such securities, money market funds, and high-quality debt investments. While investing defensively, a Fund may maintain a substantial portion of its assets in cash, on which a Fund may earn little if any income. If a Fund invests for defensive purposes, it may not achieve its investment objective. In addition, the defensive strategy may not work as intended.

Portfolio Holdings Disclosure

The Funds' portfolio holdings disclosure policy is described in the Statement of Additional Information (“SAI”).

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Management and Organization

Investment Adviser

Target Retirement 2025 Fund	0.05%
Target Retirement 2030 Fund	0.05%
Target Retirement 2035 Fund	0.05%
Target Retirement 2040 Fund	0.05%
Target Retirement 2045 Fund	0.05%
Target Retirement 2050 Fund	0.05%
Target Retirement 2055 Fund	0.05%
Target Retirement 2060 Fund	0.05%
Target Retirement 2065 Fund	0.05%
Target Retirement 2070 Fund	0.05%
Target Retirement Fund	0.05%

Total Annual Fund Operating Expense Waivers. SSGA FM, as the investment adviser to each Fund, is contractually obligated, through April 30, 2026, (i) to waive up to the full amount of the advisory fee payable by a Fund, and/or (ii) to reimburse a Fund to the extent that Total Annual Fund Operating Expenses (exclusive of nonrecurring account fees, interest, taxes, extraordinary expenses, and distribution, shareholder servicing, and sub-transfer agency fees) exceed 0.09% of average daily net assets on an annual basis. These waiver and/or reimbursement arrangements may not be terminated prior to April 30, 2026 except with approval of the Funds' Board of Trustees.

A discussion regarding the Board's consideration of the Target Retirement 2025 Fund's, Target Retirement 2030 Fund's, Target Retirement 2035 Fund's, Target Retirement 2040 Fund's, Target Retirement 2045 Fund's, Target Retirement 2050 Fund's, Target Retirement 2055 Fund's, Target Retirement 2060 Fund's, Target Retirement 2065 Fund's, and Target Retirement Fund's Investment Advisory Agreement is provided in the Funds' Form N-CSR filing for the period ended June 30, 2024. A discussion regarding the Board's consideration of Target Retirement 2070 Fund's Investment Advisory Agreement will be provided in Target Retirement 2070 Fund's initial Form N-CSR filing with the SEC.

Portfolio Management

The Adviser manages the Funds using a team of investment professionals. The team approach is used to create an environment that encourages the flow of investment ideas. The portfolio managers within the team work together in a cohesive manner to develop and enhance techniques that drive the investment process for the respective investment strategy. This approach requires portfolio managers to share a variety of responsibilities, including investment strategy and analysis, while retaining responsibility for the implementation of the strategy within any particular portfolio. The approach also enables the team to draw upon the resources of other groups within SSGA. Each portfolio management team is overseen by SSGA's internal governance.

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Key professionals involved in the day-to-day portfolio management of the Funds include the following:

Michael Narkiewicz is a Vice President of SSGA and the Adviser and a Senior Portfolio Manager in the Investment Solutions Group (ISG), where he is responsible for the design and management of a variety of multi-asset class portfolios, including strategic and tactical asset allocation strategies. His work includes aligning clients' asset allocation with their investment objectives for target retirement and real asset strategies. He is actively involved in the investment research that underpins the strategic asset allocation of these strategies, and he is a voting member of the Defined Contribution Investment Group (DCIG). Prior to his current role, Mr. Narkiewicz was a portfolio specialist within the Global Equity Beta Solutions Group. His responsibilities included investment research, analysis, and product positioning across multiple investment strategies. Before joining SSGA in 2013, Mr. Narkiewicz was a senior portfolio analyst at Shepherd Kaplan, a Boston based registered investment advisor, and an equity trader at Congress Asset Management Company. He holds a Bachelor of Science degree in Finance from Bentley University and a Master of Business Administration with a concentration in Finance from the D'Amore-McKim School of Business at Northeastern University.

Additional information about the portfolio managers' compensation, other accounts managed by the portfolio managers, and the portfolio managers' ownership of the Funds is available in the SAI.

Other Fund Services

The Administrator, Sub-Administrator and Custodian

The Adviser serves as administrator of each Fund. The amount of the fee paid to the Adviser for administrative services may vary by share class. Each Fund currently pays the Adviser an administrative fee at the annual rate of 0.05% with respect to each of its share classes. State Street, a subsidiary of State Street Corporation, serves as sub-administrator for each Fund for a fee that is paid by the Adviser. State Street also serves as custodian of each Fund for a separate fee that is paid by the Funds.

The Transfer Agent and Dividend Disbursing Agent

SS&C GIDS, Inc. is the Funds' transfer agent and dividend disbursing agent (the “Transfer Agent”).

The Distributor

State Street Global Advisors Funds Distributors, LLC serves as the Funds' distributor (“SSGA FD”) pursuant to the Distribution Agreement between SSGA FD and the Trust.

Additional Information

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Shareholder Information

Determination of Net Asset Value

Investing in State Street Institutional Investment Trust Shares

Purchasing Shares

Choosing a Share Class

The Funds offer three classes of shares through this Prospectus: Class I, Class K and Class R3, available to you subject to the eligibility requirements set forth below.

141

	Class I	Class K	Class R3
Availability	Limited to certain investors serviced through a Financial Intermediary receiving a fee from the fund for shareholder servicing or similar services.	Limited to certain investors, including certain financial institutions, qualified recordkeepers and employer-sponsored retirement plans.	Limited to certain investors, including certain financial institutions, qualified recordkeepers and employer-sponsored retirement plans.
Minimum Initial Investment	None.	None.	None.
Maximum Investment	None.	None.	None.
Initial (Front-End) Sales Charge	None. Entire purchase price is invested in shares of a Fund.	None. Entire purchase price is invested in shares of a Fund.	None. Entire purchase price is invested in shares of a Fund.
Deferred (CDSC) Sales Charge	None.	None.	None.
Distribution and Service (Rule 12b-1) Fees	None.	None.	0.25% annual fee.

Class I

Class I shares are available to the following categories of investors serviced through a Financial Intermediary receiving a fee from a Fund for shareholder servicing or similar services:

•

Discretionary and non-discretionary advisory programs;

•

Fund “supermarkets”;

•

Asset allocation programs;

142

•

Other programs in which the client pays an asset-based fee for advice or for executing transactions in Fund Shares or for otherwise participating in the program; or

•

Certain other investment programs that do not charge an asset-based fee;

Defined contribution, defined benefit and other employer-sponsored employee benefit plans, whether or not qualified under the Code.

There is no minimum investment for Class I shares.

Class K

Class K shares are available to the following categories of investors:

Banks, broker-dealers and other financial institutions (including registered investment advisers and financial planners) purchasing Fund Shares on behalf of their clients in:

•

Discretionary and non-discretionary advisory programs;

•

Fund "supermarkets";

•

Asset allocation programs;

•

Other programs in which the client pays an asset-based fee for advice or for executing transactions in Fund Shares or for otherwise participating in the program; or

•

Certain other investment programs that do not charge an asset-based fee;

Qualified recordkeepers with an applicable agreement maintained with SSGA FD;

Endowments and foundations, and defined contribution, defined benefit, and other employer-sponsored employee benefit plans, whether or not qualified under the Code;

Certain other registered open-end investment companies whose shares are distributed by SSGA FD;

Qualified state tuition plans described in Section 529 of the Code and donor-advised charitable gift funds (subject to all applicable terms and conditions);

Health Savings Accounts under Section 223 of the Code if such accounts are maintained by the Fund at an omnibus level;

Collective investment trusts.

There is no minimum investment for Class K shares.

Class R3

Class R3 shares are not subject to any sales charge. Only certain investors are eligible to buy Class R3 shares. Your Financial Intermediary can help you determine whether you are eligible to purchase Class R3 shares.

Class R3 shares are available to the following categories of investors:

401(k), 403(b), 457, deferred compensation, defined benefit, money purchase pension and profit-sharing retirement plans that require recordkeeping and administrative services.

They are not available in retail accounts or retail non-retirement accounts; Traditional and Roth IRAs, Coverdell Education Savings Accounts, SEPs, SARSEPs, and SIMPLE IRAs held in brokerage accounts; and 529 college savings plans.

There is no minimum investment for Class R3 shares.

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How to Initiate a Purchase Request

Investing in the State Street Funds Through a Financial Intermediary

Account Applications and Other Documents. You may find many of the forms necessary to open an account online or by calling or writing to the State Street Funds. See Contacting the State Street Funds.

Please be sure to check Exchanging Shares and Frequent-Trading Limits below.

How to Pay for a Purchase

By Check. You may send a check to make initial or additional purchases to your fund account. Make your check payable to “State Street Funds” and include the appropriate fund name and account number (e.g., “State Street Target Retirement 2025 Fund—a/c #xxx”) in the memo section of the check.

Trade Dates-Purchases

If your purchase request is not in good order, it may be rejected.

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For further information about purchase transactions, consult our website at www.ssga.com or see Contacting the State Street Funds.

Other Purchase Policies You Should Know

Redeeming Shares

By Telephone. You may call the State Street Funds to request a redemption of shares. See Contacting the State Street Funds.

By Mail. You may send a written request to the State Street Funds to redeem from a Fund account or to make an exchange. See Contacting the State Street Funds.

Please be sure to check Exchanging Shares and Frequent-Trading Limits below.

Trade Date-Redemptions

The trade date for any redemption request received in good order will depend on the day and time the State Street Funds receive your request in good order and the manner in which you are redeeming.

How to Receive Redemption Proceeds

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Other Redemption Policies that You Should Know

Address Changes. If your address of record has been changed within thirty (30) days of the redemption request, the request must be in writing and bear a medallion guarantee.

Significant/Unusual Economic or Market Activity. During periods of significant or unusual economic or market activity, you may encounter delays attempting to give instructions by phone.

146

Exchanging Shares

Share Class Conversions

You may be able to convert your shares to a different share class of the same Fund that has a lower expense ratio provided that you are eligible to buy that share class and that certain conditions are met. This conversion feature is intended for shares held through a Financial Intermediary offering a fee-based or wrap fee program that has an agreement with SSGA FD specific for this purpose. In such instance, your shares may be automatically converted under certain circumstances. Class N shares of a State Street Fund may be converted to Class I shares of the same State Street Fund. Not all share classes are available through all Financial Intermediaries. If your shares of a Fund are converted to a different share class of the same Fund, the transaction will be based on the respective NAV of each class as of the trade date of the conversion. Consequently, you may receive fewer shares or more shares than originally owned, depending on that day's NAVs. The total value of the initially held shares, however, will equal the total value of the converted shares at the time of conversion. The conversion of shares of one class of a Fund into shares of another class of the same Fund is not taxable for U.S. federal income tax purposes and no gain or loss will be reported on the transaction. See the applicable prospectus for share class information. Please contact your Financial Intermediary regarding the tax consequences of any conversion and for additional information.

Frequent-Trading Limits

147

days in connection with identifying roundtrip transactions. Shareholders with one or more roundtrip transactions may, in the discretion of a State Street Fund, be blocked from making additional purchases or exchanges in any State Street Fund for a period of time. A State Street Fund has discretion to determine that action is not necessary if it determines that a pattern of trading is not abusive or harmful to the affected Fund in a material way. Fund size and/or transaction size may be considered in evaluating any roundtrip transaction.

As a means to protect each State Street Fund and its shareholders from Excessive Trading:

•

The State Street Funds' distributor has detailed procedures that document the transparency oversight and monitoring processes performed by the State Street Funds' transfer agent.

Service Options

Dividend and Capital Gain Distribution Option

Please refer to Dividends, Distributions and Tax Considerations below for additional information.

Automatic Withdrawal Plan

Telephone Redemptions and Exchanges

148

Automatic Investment Plan

Additional Shareholder Information

Account Transfers

Responsibility for Fraud

Right to Change Policies

In addition to the rights expressly stated elsewhere in this Prospectus, the State Street Funds reserve the right, in the future, to:

Alter, add, or discontinue any conditions of purchase (including eligibility requirements), redemption, exchange, service, or privilege at any time;

Accept initial purchases by telephone;

Alter, impose, discontinue, or waive any redemption fee, account service fee, or other fees charged to a group of shareholders; and

Unclaimed Property

149

Dividends, Distributions and Tax Considerations

Distribution Options. You can choose from four different distribution options as indicated on the application:

•

Income-Earned Option—Capital gain distributions will be automatically reinvested, but a check, direct deposit or wire will be sent for each dividend distribution.

•

Cash Option—A check, wire or direct deposit will be sent for each dividend and capital gain distribution.

•

Direct Dividends Option—Dividends and capital gain distributions will be automatically invested in another identically registered State Street Fund of the same share class.

Delivery of Documents to Accounts Sharing an Address

To reduce expenses, we may mail only one copy of the Funds' Prospectus and each annual and semi-annual report to those addresses shared by two or more accounts. If you wish to receive individual copies of these documents, please call us at (800) 997-7327, or contact your financial institution. We will begin sending you individual copies thirty (30) days after receiving your request.

Tax Considerations

The following discussion is a summary of some important U.S. federal income tax considerations generally applicable to an investment in a Fund. Your investment in a Fund may have other tax implications. Please consult your tax advisor about federal, state, local, foreign or other tax laws applicable to you. Investors, including non-U.S. investors, may wish to consult the SAI tax section for additional disclosure. Each of the Funds seeks to achieve its investment objective by investing in a combination of Underlying Funds each of which intends to qualify and be treated as a regulated investment company for U.S. federal income tax purposes such that substantially all of the Funds' income will result from distributions from such Underlying Funds. Therefore, as applicable, and except as otherwise stated, references in this section to the assets owned or income earned by a Fund will include such assets and income of the corresponding Underlying Funds.

150

lated investment company, a Fund must, among other things, satisfy diversification, 90% gross income and distribution requirements. A Fund's failure to qualify as a regulated investment company would result in corporate level taxation, and consequently, a reduction in income available for distribution to shareholders.

For U.S. federal income tax purposes, distributions of investment income generally are taxable to you as ordinary income. Taxes on distributions of capital gains generally are determined by how long the applicable Fund owned (or is deemed to have owned) the investments that generated them, rather than how long you have owned your Fund Shares. Distributions of net capital gains (that is, the excess of net long-term capital gains over net short-term capital losses) from the sale of investments that a Fund owned (or is deemed to have owned) for more than one year that are properly reported by a Fund as capital gain dividends generally will be treated as long-term capital gain includible in your net capital gain and taxed to individuals at reduced rates. Distributions of gains from investments that a Fund owned (or is deemed to have owned) for one year or less generally will be taxable to you as ordinary income. Distributions of investment income properly reported by a Fund as derived from “qualified dividend income,” which will not include income from the Fund's portfolio securities on loan, are taxed to individuals at the rates applicable to net capital gain, provided holding period and other requirements are met by both the shareholder and the Fund. Distributions are taxable to you even if they are paid from income or gains earned by a Fund before your investment (and thus were included in the price you paid for your shares). Distributions may also be subject to state and local taxes and are taxable whether you receive them in cash or reinvest them in additional shares. Distributions in excess of a Fund's current and accumulated earnings and profits are treated as a return of capital to the extent of your basis in the applicable Fund's shares, and, in general, as capital gain thereafter.

A Fund's income from or proceeds of dispositions of its investments in non-U.S. assets may be subject to non-U.S. withholding or other taxes, which will reduce the yield on those investments. In certain instances, a Fund may be entitled to elect to pass through to its shareholders a credit (or deduction, for a shareholder that itemizes deductions and so chooses) for foreign taxes (if any) borne with respect to foreign securities income earned by the Fund. If the Fund so elects, shareholders will include in gross income from foreign sources their pro rata shares of such taxes, if any, treated as paid by the Fund. There can be no assurance that a Fund will make such election, even if it is eligible to do so. If a Fund does not qualify for or does not make such election, shareholders will not be entitled separately to claim a credit or deduction with respect to foreign taxes incurred by the Fund; in that case the foreign tax will nonetheless reduce the Fund's taxable income. Shareholders that are not subject to U.S. federal income tax, and those who invest in a Fund through tax-advantaged accounts (including those who invest through IRAs or other tax-advantaged retirement plans), generally will receive no benefit from any tax credit or deduction passed through by the Fund. Under certain circumstances, if a Fund receives a refund of foreign taxes paid in respect of a prior year, the value of Fund Shares could be affected or any foreign tax credits or deductions passed through to shareholders in respect of the Fund's foreign taxes for the current year could be reduced.

Certain of a Fund's investment practices, including derivative transactions and investments in debt obligations issued or purchased at a discount, will be subject to special and complex U.S. federal income tax provisions. These special rules may affect the timing, character, and/or amount of a Fund's distributions, and may require the Fund to sell its investments at a time when it is not advantageous to do so.

A Fund's investments in the Underlying Funds may cause the tax treatment of the Fund's gains, losses and distributions to differ from the tax treatment that would apply if the Fund invested directly in the types of securities held by the Underlying Funds. As a result, investors may receive taxable distributions earlier and recognize higher amounts of capital gain or ordinary income than they otherwise would.

151

report any part of its dividends as are eligible for such treatment. A Fund's dividends other than those the Fund so reports as capital gain dividends, short-term capital gain dividends, or interest-related dividends generally will be subject to U.S. withholding tax at a 30% rate (or lower applicable treaty rate). See each Fund's SAI for further information.

Financial Intermediary Arrangements

Payments to Financial Intermediaries

The Funds have adopted a distribution plan pursuant to Rule 12b-1 under the 1940 Act under which a Fund may compensate SSGA FD (or others) for services in connection with the distribution of a Fund's Class R3 shares and for services provided to shareholders in that class (the “Plan”). The Plan calls for payments at an annual rate (based on average daily net assets) of 0.25% of each Fund's net assets attributable to its Class R3 shares. Because these fees are paid out of the assets of a Fund attributable to its Class R3 shares on an ongoing basis, they will increase the cost of your investment and may cost you more over time than paying other types of sales charges.

A Fund may pay distribution fees and other amounts described in this Prospectus at a time when shares of that Fund are unavailable for purchase.

Other Payments to Financial Intermediaries

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Financial Highlights

154

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET TARGET RETIREMENT 2025 FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class I
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$11.62	$10.70	$13.50	$13.06	$11.92
Income (loss) from investment operations:
Net investment income (loss) (a)	0.38	0.37	0.30	0.15	0.50
Net realized and unrealized gain (loss)	0.64	1.08	(2.40 )	1.16	1.26
Total from investment operations	1.02	1.45	(2.10 )	1.31	1.76
Distributions to shareholders from:
Net investment income	(0.40 )	(0.35 )	(0.30 )	(0.29 )	(0.25 )
Net realized gains	(0.39 )	(0.18 )	(0.40 )	(0.58 )	(0.37 )
Total distributions	(0.79 )	(0.53 )	(0.70 )	(0.87 )	(0.62 )
Net asset value, end of period	$11.85	$11.62	$10.70	$13.50	$13.06
Total return (b)	8.76 %	13.58 %	(15.47 )%	10.03 %	14.66 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$10,309	$9,938	$3,610	$5,301	$59,792
Ratios to Average Net Assets:
Total expenses (c)	0.27 %	0.26 %	0.26 %	0.38 %	0.19 %
Net expenses (c)	0.14 %	0.12 %	0.13 %	0.25 %	0.04 %
Net investment income (loss)	3.13 %	3.26 %	2.46 %	1.11 %	3.96 %
Portfolio turnover rate	18 %	14 %	16 %	24 %	39 %

(a)	Net investment income per share is calculated using the average shares method.
(b)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(c)	Does not include expenses of the Underlying Funds in which the Fund invests.

155

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET TARGET RETIREMENT 2025 FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class K
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$11.72	$10.79	$13.60	$13.09	$11.94
Income (loss) from investment operations:
Net investment income (loss) (a)	0.40	0.35	0.33	0.36	0.27
Net realized and unrealized gain (loss)	0.65	1.12	(2.42 )	1.06	1.50
Total from investment operations	1.05	1.47	(2.09 )	1.42	1.77
Distributions to shareholders from:
Net investment income	(0.42 )	(0.36 )	(0.32 )	(0.33 )	(0.25 )
Net realized gains	(0.39 )	(0.18 )	(0.40 )	(0.58 )	(0.37 )
Total distributions	(0.81 )	(0.54 )	(0.72 )	(0.91 )	(0.62 )
Net asset value, end of period	$11.96	$11.72	$10.79	$13.60	$13.09
Total return (b)	8.92 %	13.68 %	(15.33 )%	10.81 %	14.84 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$1,947,698	$1,910,011	$1,615,466	$1,738,831	$1,228,301
Ratios to Average Net Assets:
Total expenses (c)	0.12 %	0.13 %	0.13 %	0.13 %	0.14 %
Net expenses (c)	(0.01 )%(d)	(0.01 )%(d)	0.00 %(e)	0.00 %(e)	(0.01 )%(d)
Net investment income (loss)	3.26 %	3.09 %	2.73 %	2.57 %	2.24 %
Portfolio turnover rate	18 %	14 %	16 %	24 %	39 %

(a)	Net investment income per share is calculated using the average shares method.
(b)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(c)	Does not include expenses of the Underlying Funds in which the Fund invests.
(d)	Due to the Fund waiving acquired Fund fees, the waiver exceeded total fund expenses.
(e)	Amount is less than 0.005%.

156

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET TARGET RETIREMENT 2025 FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class R3
	Year Ended 12/31/24	Year Ended 12/31/23	For the Period 2/28/22*- 12/31/22
Net asset value, beginning of period	$11.74	$10.80	$12.89
Income (loss) from investment operations:
Net investment income (loss) (a)	0.33	0.30	0.26
Net realized and unrealized gain (loss)	0.65	1.12	(1.69 )
Total from investment operations	0.98	1.42	(1.43 )
Distributions to shareholders from:
Net investment income	(0.36 )	(0.30 )	(0.26 )
Net realized gains	(0.39 )	(0.18 )	(0.40 )
Total distributions	(0.75 )	(0.48 )	(0.66 )
Net asset value, end of period	$11.97	$11.74	$10.80
Total return (b)	8.27 %	13.09 %	(10.96 )%
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$13,145	$13,239	$11,524
Ratios to Average Net Assets:
Total expenses (c)	0.62 %	0.63 %	0.63 %(d)
Net expenses (c)	0.49 %	0.49 %	0.50 %(d)
Net investment income (loss)	2.72 %	2.62 %	2.64 %(d)
Portfolio turnover rate	18 %	14 %	16 %

*	Commencement of operations.
(a)	Net investment income per share is calculated using the average shares method.
(b)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(c)	Does not include expenses of the Underlying Funds in which the Fund invests.
(d)	Annualized.

157

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET TARGET RETIREMENT 2030 FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class I
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$12.43	$11.19	$14.29	$13.70	$12.26
Income (loss) from investment operations:
Net investment income (loss) (a)	0.39	0.35	0.26	0.11	0.53
Net realized and unrealized gain (loss)	0.83	1.40	(2.71 )	1.36	1.58
Total from investment operations	1.22	1.75	(2.45 )	1.47	2.11
Distributions to shareholders from:
Net investment income	(0.38 )	(0.34 )	(0.26 )	(0.27 )	(0.24 )
Net realized gains	(0.41 )	(0.17 )	(0.39 )	(0.61 )	(0.43 )
Total distributions	(0.79 )	(0.51 )	(0.65 )	(0.88 )	(0.67 )
Net asset value, end of period	$12.86	$12.43	$11.19	$14.29	$13.70
Total return (b)	9.80 %	15.63 %	(17.13 )%	10.76 %	17.26 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$23,408	$20,488	$6,903	$8,838	$69,750
Ratios to Average Net Assets:
Total expenses (c)	0.27 %	0.25 %	0.25 %	0.37 %	0.19 %
Net expenses (c)	0.17 %	0.15 %	0.15 %	0.27 %	0.08 %
Net investment income (loss)	2.92 %	2.93 %	2.04 %	0.74 %	4.00 %
Portfolio turnover rate	15 %	12 %	14 %	22 %	27 %

(a)	Net investment income per share is calculated using the average shares method.
(b)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(c)	Does not include expenses of the Underlying Funds in which the Fund invests.

158

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET TARGET RETIREMENT 2030 FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class K
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$12.51	$11.26	$14.36	$13.72	$12.27
Income (loss) from investment operations:
Net investment income (loss) (a)	0.40	0.35	0.29	0.35	0.27
Net realized and unrealized gain (loss)	0.85	1.42	(2.73 )	1.21	1.86
Total from investment operations	1.25	1.77	(2.44 )	1.56	2.13
Distributions to shareholders from:
Net investment income	(0.40 )	(0.35 )	(0.27 )	(0.31 )	(0.25 )
Net realized gains	(0.41 )	(0.17 )	(0.39 )	(0.61 )	(0.43 )
Total distributions	(0.81 )	(0.52 )	(0.66 )	(0.92 )	(0.68 )
Net asset value, end of period	$12.95	$12.51	$11.26	$14.36	$13.72
Total return (b)	9.97 %	15.74 %	(16.95 )%	11.37 %	17.24 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$2,979,566	$2,651,799	$1,991,503	$2,055,047	$1,367,241
Ratios to Average Net Assets:
Total expenses (c)	0.12 %	0.12 %	0.13 %	0.12 %	0.14 %
Net expenses (c)	0.02 %	0.02 %	0.02 %	0.03 %	0.03 %
Net investment income (loss)	3.04 %	2.90 %	2.30 %	2.37 %	2.13 %
Portfolio turnover rate	15 %	12 %	14 %	22 %	27 %

(a)	Net investment income per share is calculated using the average shares method.
(b)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(c)	Does not include expenses of the Underlying Funds in which the Fund invests.

159

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET TARGET RETIREMENT 2030 FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class R3
	Year Ended 12/31/24	Year Ended 12/31/23	For the Period 2/28/22*- 12/31/22
Net asset value, beginning of period	$12.52	$11.27	$13.51
Income (loss) from investment operations:
Net investment income (loss) (a)	0.33	0.28	0.21
Net realized and unrealized gain (loss)	0.86	1.43	(1.85 )
Total from investment operations	1.19	1.71	(1.64 )
Distributions to shareholders from:
Net investment income	(0.33 )	(0.29 )	(0.21 )
Net realized gains	(0.41 )	(0.17 )	(0.39 )
Total distributions	(0.74 )	(0.46 )	(0.60 )
Net asset value, end of period	$12.97	$12.52	$11.27
Total return (b)	9.50 %	15.15 %	(12.10 )%
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$34,010	$31,819	$26,891
Ratios to Average Net Assets:
Total expenses (c)	0.62 %	0.62 %	0.63 %(d)
Net expenses (c)	0.52 %	0.52 %	0.52 %(d)
Net investment income (loss)	2.52 %	2.32 %	2.04 %(d)
Portfolio turnover rate	15 %	12 %	14 %

*	Commencement of operations.
(a)	Net investment income per share is calculated using the average shares method.
(b)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(c)	Does not include expenses of the Underlying Funds in which the Fund invests.
(d)	Annualized.

160

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET TARGET RETIREMENT 2035 FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class I
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$13.06	$11.64	$14.96	$14.16	$12.54
Income (loss) from investment operations:
Net investment income (loss) (a)	0.38	0.30	0.21	0.06	0.56
Net realized and unrealized gain (loss)	1.00	1.65	(2.92 )	1.55	1.71
Total from investment operations	1.38	1.95	(2.71 )	1.61	2.27
Distributions to shareholders from:
Net investment income	(0.38 )	(0.33 )	(0.22 )	(0.26 )	(0.24 )
Net realized gains	(0.37 )	(0.20 )	(0.39 )	(0.55 )	(0.41 )
Total distributions	(0.75 )	(0.53 )	(0.61 )	(0.81 )	(0.65 )
Net asset value, end of period	$13.69	$13.06	$11.64	$14.96	$14.16
Total return (b)	10.49 %	16.70 %	(18.02 )%	11.38 %	18.05 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$6,491	$6,801	$3,527	$4,878	$49,518
Ratios to Average Net Assets:
Total expenses (c)	0.28 %	0.27 %	0.28 %	0.38 %	0.20 %
Net expenses (c)	0.20 %	0.18 %	0.19 %	0.29 %	0.10 %
Net investment income (loss)	2.69 %	2.43 %	1.60 %	0.41 %	4.14 %
Portfolio turnover rate	14 %	11 %	12 %	19 %	22 %

(a)	Net investment income per share is calculated using the average shares method.
(b)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(c)	Does not include expenses of the Underlying Funds in which the Fund invests.

161

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET TARGET RETIREMENT 2035 FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class K
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$13.20	$11.75	$15.09	$14.21	$12.57
Income (loss) from investment operations:
Net investment income (loss) (a)	0.40	0.34	0.26	0.34	0.26
Net realized and unrealized gain (loss)	1.01	1.65	(2.97 )	1.39	2.03
Total from investment operations	1.41	1.99	(2.71 )	1.73	2.29
Distributions to shareholders from:
Net investment income	(0.40 )	(0.34 )	(0.24 )	(0.30 )	(0.24 )
Net realized gains	(0.37 )	(0.20 )	(0.39 )	(0.55 )	(0.41 )
Total distributions	(0.77 )	(0.54 )	(0.63 )	(0.85 )	(0.65 )
Net asset value, end of period	$13.84	$13.20	$11.75	$15.09	$14.21
Total return (b)	10.62 %	16.94 %	(17.89 )%	12.18 %	18.19 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$2,979,142	$2,566,604	$1,883,267	$1,863,635	$1,215,824
Ratios to Average Net Assets:
Total expenses (c)	0.12 %	0.13 %	0.13 %	0.13 %	0.14 %
Net expenses (c)	0.04 %	0.04 %	0.04 %	0.04 %	0.04 %
Net investment income (loss)	2.87 %	2.71 %	2.00 %	2.26 %	2.03 %
Portfolio turnover rate	14 %	11 %	12 %	19 %	22 %

(a)	Net investment income per share is calculated using the average shares method.
(b)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(c)	Does not include expenses of the Underlying Funds in which the Fund invests.

162

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET TARGET RETIREMENT 2035 FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class R3
	Year Ended 12/31/24	Year Ended 12/31/23	For the Period 2/28/22*- 12/31/22
Net asset value, beginning of period	$13.21	$11.76	$14.13
Income (loss) from investment operations:
Net investment income (loss) (a)	0.34	0.27	0.18
Net realized and unrealized gain (loss)	1.00	1.65	(1.98 )
Total from investment operations	1.34	1.92	(1.80 )
Distributions to shareholders from:
Net investment income	(0.33 )	(0.27 )	(0.18 )
Net realized gains	(0.37 )	(0.20 )	(0.39 )
Total distributions	(0.70 )	(0.47 )	(0.57 )
Net asset value, end of period	$13.85	$13.21	$11.76
Total return (b)	10.05 %	16.34 %	(12.69 )%
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$19,401	$15,189	$11,922
Ratios to Average Net Assets:
Total expenses (c)	0.62 %	0.63 %	0.63 %(d)
Net expenses (c)	0.54 %	0.54 %	0.54 %(d)
Net investment income (loss)	2.42 %	2.13 %	1.70 %(d)
Portfolio turnover rate	14 %	11 %	12 %

*	Commencement of operations.
(a)	Net investment income per share is calculated using the average shares method.
(b)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(c)	Does not include expenses of the Underlying Funds in which the Fund invests.
(d)	Annualized.

163

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET TARGET RETIREMENT 2040 FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class I
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$13.31	$11.74	$15.19	$14.35	$12.65
Income (loss) from investment operations:
Net investment income (loss) (a)	0.36	0.29	0.21	0.02	0.58
Net realized and unrealized gain (loss)	1.14	1.79	(3.03 )	1.67	1.79
Total from investment operations	1.50	2.08	(2.82 )	1.69	2.37
Distributions to shareholders from:
Net investment income	(0.36 )	(0.31 )	(0.20 )	(0.26 )	(0.23 )
Net realized gains	(0.34 )	(0.20 )	(0.43 )	(0.59 )	(0.44 )
Total distributions	(0.70 )	(0.51 )	(0.63 )	(0.85 )	(0.67 )
Net asset value, end of period	$14.11	$13.31	$11.74	$15.19	$14.35
Total return (b)	11.24 %	17.65 %	(18.51 )%	11.75 %	18.70 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$6,302	$5,479	$2,780	$2,991	$51,116
Ratios to Average Net Assets:
Total expenses (c)	0.27 %	0.27 %	0.28 %	0.39 %	0.20 %
Net expenses (c)	0.21 %	0.19 %	0.20 %	0.32 %	0.10 %
Net investment income (loss)	2.55 %	2.31 %	1.62 %	0.12 %	4.25 %
Portfolio turnover rate	12 %	12 %	12 %	19 %	19 %

(a)	Net investment income per share is calculated using the average shares method.
(b)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(c)	Does not include expenses of the Underlying Funds in which the Fund invests.

164

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET TARGET RETIREMENT 2040 FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class K
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$13.48	$11.88	$15.36	$14.36	$12.66
Income (loss) from investment operations:
Net investment income (loss) (a)	0.39	0.32	0.24	0.35	0.25
Net realized and unrealized gain (loss)	1.15	1.80	(3.07 )	1.54	2.12
Total from investment operations	1.54	2.12	(2.83 )	1.89	2.37
Distributions to shareholders from:
Net investment income	(0.38 )	(0.32 )	(0.22 )	(0.30 )	(0.23 )
Net realized gains	(0.34 )	(0.20 )	(0.43 )	(0.59 )	(0.44 )
Total distributions	(0.72 )	(0.52 )	(0.65 )	(0.89 )	(0.67 )
Net asset value, end of period	$14.30	$13.48	$11.88	$15.36	$14.36
Total return (b)	11.40 %	17.82 %	(18.40 )%	13.15 %	18.79 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$2,767,819	$2,352,248	$1,664,976	$1,677,750	$1,076,641
Ratios to Average Net Assets:
Total expenses (c)	0.12 %	0.13 %	0.14 %	0.13 %	0.15 %
Net expenses (c)	0.06 %	0.05 %	0.05 %	0.05 %	0.05 %
Net investment income (loss)	2.68 %	2.52 %	1.79 %	2.23 %	1.94 %
Portfolio turnover rate	12 %	12 %	12 %	19 %	19 %

(a)	Net investment income per share is calculated using the average shares method.
(b)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(c)	Does not include expenses of the Underlying Funds in which the Fund invests.

165

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET TARGET RETIREMENT 2040 FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class R3
	Year Ended 12/31/24	Year Ended 12/31/23	For the Period 2/28/22*- 12/31/22
Net asset value, beginning of period	$13.49	$11.89	$14.35
Income (loss) from investment operations:
Net investment income (loss) (a)	0.31	0.24	0.16
Net realized and unrealized gain (loss)	1.15	1.81	(2.03 )
Total from investment operations	1.46	2.05	(1.87 )
Distributions to shareholders from:
Net investment income	(0.30 )	(0.25 )	(0.16 )
Net realized gains	(0.34 )	(0.20 )	(0.43 )
Total distributions	(0.64 )	(0.45 )	(0.59 )
Net asset value, end of period	$14.31	$13.49	$11.89
Total return (b)	10.83 %	17.22 %	(13.03 )%
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$29,123	$26,093	$21,698
Ratios to Average Net Assets:
Total expenses (c)	0.62 %	0.63 %	0.64 %(d)
Net expenses (c)	0.56 %	0.55 %	0.55 %(d)
Net investment income (loss)	2.13 %	1.89 %	1.44 %(d)
Portfolio turnover rate	12 %	12 %	12 %

*	Commencement of operations.
(a)	Net investment income per share is calculated using the average shares method.
(b)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(c)	Does not include expenses of the Underlying Funds in which the Fund invests.
(d)	Annualized.

166

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET TARGET RETIREMENT 2045 FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class I
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$13.83	$12.09	$15.72	$14.58	$12.72
Income (loss) from investment operations:
Net investment income (loss) (a)	0.34	0.32	0.20	0.03	0.58
Net realized and unrealized gain (loss)	1.30	1.91	(3.19 )	1.88	1.87
Total from investment operations	1.64	2.23	(2.99 )	1.91	2.45
Distributions to shareholders from:
Net investment income	(0.35 )	(0.31 )	(0.20 )	(0.28 )	(0.22 )
Net realized gains	(0.37 )	(0.18 )	(0.44 )	(0.49 )	(0.37 )
Total distributions	(0.72 )	(0.49 )	(0.64 )	(0.77 )	(0.59 )
Net asset value, end of period	$14.75	$13.83	$12.09	$15.72	$14.58
Total return (b)	11.84 %	18.45 %	(18.93 )%	13.08 %	19.26 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$3,263	$3,304	$1,645	$2,357	$23,059
Ratios to Average Net Assets:
Total expenses (c)	0.28 %	0.27 %	0.28 %	0.39 %	0.21 %
Net expenses (c)	0.21 %	0.19 %	0.18 %	0.30 %	0.10 %
Net investment income (loss)	2.29 %	2.42 %	1.46 %	0.17 %	4.27 %
Portfolio turnover rate	13 %	10 %	10 %	17 %	18 %

(a)	Net investment income per share is calculated using the average shares method.
(b)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(c)	Does not include expenses of the Underlying Funds in which the Fund invests.

167

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET TARGET RETIREMENT 2045 FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class K
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$13.91	$12.16	$15.79	$14.58	$12.72
Income (loss) from investment operations:
Net investment income (loss) (a)	0.39	0.33	0.24	0.37	0.25
Net realized and unrealized gain (loss)	1.29	1.93	(3.21 )	1.65	2.21
Total from investment operations	1.68	2.26	(2.97 )	2.02	2.46
Distributions to shareholders from:
Net investment income	(0.38 )	(0.33 )	(0.22 )	(0.32 )	(0.23 )
Net realized gains	(0.37 )	(0.18 )	(0.44 )	(0.49 )	(0.37 )
Total distributions	(0.75 )	(0.51 )	(0.66 )	(0.81 )	(0.60 )
Net asset value, end of period	$14.84	$13.91	$12.16	$15.79	$14.58
Total return (b)	12.00 %	18.56 %	(18.75 )%	13.83 %	19.28 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$2,541,824	$2,108,582	$1,459,184	$1,409,868	$847,354
Ratios to Average Net Assets:
Total expenses (c)	0.13 %	0.13 %	0.14 %	0.14 %	0.16 %
Net expenses (c)	0.06 %	0.06 %	0.05 %	0.05 %	0.05 %
Net investment income (loss)	2.57 %	2.47 %	1.80 %	2.32 %	1.93 %
Portfolio turnover rate	13 %	10 %	10 %	17 %	18 %

(a)	Net investment income per share is calculated using the average shares method.
(b)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(c)	Does not include expenses of the Underlying Funds in which the Fund invests.

168

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET TARGET RETIREMENT 2045 FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class R3
	Year Ended 12/31/24	Year Ended 12/31/23	For the Period 2/28/22*- 12/31/22
Net asset value, beginning of period	$13.92	$12.17	$14.72
Income (loss) from investment operations:
Net investment income (loss) (a)	0.31	0.26	0.17
Net realized and unrealized gain (loss)	1.29	1.92	(2.13 )
Total from investment operations	1.60	2.18	(1.96 )
Distributions to shareholders from:
Net investment income	(0.30 )	(0.25 )	(0.15 )
Net realized gains	(0.37 )	(0.18 )	(0.44 )
Total distributions	(0.67 )	(0.43 )	(0.59 )
Net asset value, end of period	$14.85	$13.92	$12.17
Total return (b)	11.43 %	17.95 %	(13.21 )%
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$19,198	$15,266	$10,148
Ratios to Average Net Assets:
Total expenses (c)	0.62 %	0.63 %	0.64 %(d)
Net expenses (c)	0.56 %	0.56 %	0.55 %(d)
Net investment income (loss)	2.06 %	1.99 %	1.57 %(d)
Portfolio turnover rate	13 %	10 %	10 %

*	Commencement of operations.
(a)	Net investment income per share is calculated using the average shares method.
(b)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(c)	Does not include expenses of the Underlying Funds in which the Fund invests.
(d)	Annualized.

169

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET TARGET RETIREMENT 2050 FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class I
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$13.82	$11.96	$15.62	$14.48	$12.60
Income (loss) from investment operations:
Net investment income (loss) (a)	0.34	0.28	0.23	0.00 (b)	0.61
Net realized and unrealized gain (loss)	1.38	2.01	(3.23 )	1.90	1.87
Total from investment operations	1.72	2.29	(3.00 )	1.90	2.48
Distributions to shareholders from:
Net investment income	(0.35 )	(0.30 )	(0.20 )	(0.28 )	(0.22 )
Net realized gains	(0.34 )	(0.13 )	(0.46 )	(0.48 )	(0.38 )
Total distributions	(0.69 )	(0.43 )	(0.66 )	(0.76 )	(0.60 )
Net asset value, end of period	$14.85	$13.82	$11.96	$15.62	$14.48
Total return (c)	12.38 %	19.16 %	(19.19 )%	13.12 %	19.67 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$3,469	$3,336	$1,923	$1,596	$24,016
Ratios to Average Net Assets:
Total expenses (d)	0.29 %	0.29 %	0.31 %	0.41 %	0.24 %
Net expenses (d)	0.22 %	0.20 %	0.21 %	0.31 %	0.10 %
Net investment income (loss)	2.28 %	2.18 %	1.73 %	0.02 %	4.48 %
Portfolio turnover rate	13 %	9 %	10 %	17 %	16 %

(a)	Net investment income per share is calculated using the average shares method.
(b)	Amount is less than $0.005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(d)	Does not include expenses of the Underlying Funds in which the Fund invests.

170

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET TARGET RETIREMENT 2050 FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class K
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$13.97	$12.08	$15.77	$14.49	$12.60
Income (loss) from investment operations:
Net investment income (loss) (a)	0.38	0.33	0.25	0.38	0.25
Net realized and unrealized gain (loss)	1.38	2.01	(3.27 )	1.70	2.24
Total from investment operations	1.76	2.34	(3.02 )	2.08	2.49
Distributions to shareholders from:
Net investment income	(0.37 )	(0.32 )	(0.21 )	(0.32 )	(0.22 )
Net realized gains	(0.34 )	(0.13 )	(0.46 )	(0.48 )	(0.38 )
Total distributions	(0.71 )	(0.45 )	(0.67 )	(0.80 )	(0.60 )
Net asset value, end of period	$15.02	$13.97	$12.08	$15.77	$14.49
Total return (b)	12.56 %	19.36 %	(19.10 )%	14.37 %	19.76 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$2,153,242	$1,740,744	$1,121,272	$1,021,959	$587,556
Ratios to Average Net Assets:
Total expenses (c)	0.13 %	0.14 %	0.16 %	0.15 %	0.19 %
Net expenses (c)	0.06 %	0.05 %	0.05 %	0.05 %	0.05 %
Net investment income (loss)	2.54 %	2.51 %	1.84 %	2.42 %	1.98 %
Portfolio turnover rate	13 %	9 %	10 %	17 %	16 %

(a)	Net investment income per share is calculated using the average shares method.
(b)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(c)	Does not include expenses of the Underlying Funds in which the Fund invests.

171

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET TARGET RETIREMENT 2050 FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class R3
	Year Ended 12/31/24	Year Ended 12/31/23	For the Period 2/11/22*- 12/31/22
Net asset value, beginning of period	$13.98	$12.08	$14.87
Income (loss) from investment operations:
Net investment income (loss) (a)	0.29	0.26	0.17
Net realized and unrealized gain (loss)	1.39	2.02	(2.35 )
Total from investment operations	1.68	2.28	(2.18 )
Distributions to shareholders from:
Net investment income	(0.29 )	(0.25 )	(0.15 )
Net realized gains	(0.34 )	(0.13 )	(0.46 )
Total distributions	(0.63 )	(0.38 )	(0.61 )
Net asset value, end of period	$15.03	$13.98	$12.08
Total return (b)	11.98 %	18.85 %	(14.64 )%
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$24,996	$21,284	$13,177
Ratios to Average Net Assets:
Total expenses (c)	0.63 %	0.64 %	0.66 %(d)
Net expenses (c)	0.56 %	0.55 %	0.55 %(d)
Net investment income (loss)	1.91 %	2.01 %	1.47 %(d)
Portfolio turnover rate	13 %	9 %	10 %

*	Commencement of operations.
(a)	Net investment income per share is calculated using the average shares method.
(b)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(c)	Does not include expenses of the Underlying Funds in which the Fund invests.
(d)	Annualized.

172

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET TARGET RETIREMENT 2055 FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class I
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$14.24	$12.29	$15.98	$14.72	$12.68
Income (loss) from investment operations:
Net investment income (loss) (a)	0.23	0.32	0.23	0.01	0.63
Net realized and unrealized gain (loss)	1.54	2.06	(3.31 )	1.95	1.86
Total from investment operations	1.77	2.38	(3.08 )	1.96	2.49
Distributions to shareholders from:
Net investment income	(0.35 )	(0.31 )	(0.20 )	(0.28 )	(0.22 )
Net realized gains	(0.33 )	(0.12 )	(0.41 )	(0.42 )	(0.23 )
Total distributions	(0.68 )	(0.43 )	(0.61 )	(0.70 )	(0.45 )
Net asset value, end of period	$15.33	$14.24	$12.29	$15.98	$14.72
Total return (b)	12.40 %	19.33 %	(19.23 )%	13.32 %	19.60 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$1,284	$1,838	$996	$715	$8,940
Ratios to Average Net Assets:
Total expenses (c)	0.33 %	0.31 %	0.34 %	0.44 %	0.32 %
Net expenses (c)	0.25 %	0.21 %	0.21 %	0.31 %	0.09 %
Net investment income (loss)	1.51 %	2.42 %	1.72 %	0.05 %	4.61 %
Portfolio turnover rate	13 %	9 %	9 %	15 %	18 %

(a)	Net investment income per share is calculated using the average shares method.
(b)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(c)	Does not include expenses of the Underlying Funds in which the Fund invests.

173

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET TARGET RETIREMENT 2055 FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class K
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$14.32	$12.36	$16.06	$14.70	$12.66
Income (loss) from investment operations:
Net investment income (loss) (a)	0.40	0.34	0.26	0.40	0.26
Net realized and unrealized gain (loss)	1.42	2.07	(3.33 )	1.71	2.23
Total from investment operations	1.82	2.41	(3.07 )	2.11	2.49
Distributions to shareholders from:
Net investment income	(0.38 )	(0.33 )	(0.22 )	(0.33 )	(0.22 )
Net realized gains	(0.33 )	(0.12 )	(0.41 )	(0.42 )	(0.23 )
Total distributions	(0.71 )	(0.45 )	(0.63 )	(0.75 )	(0.45 )
Net asset value, end of period	$15.43	$14.32	$12.36	$16.06	$14.70
Total return (b)	12.66 %	19.45 %	(19.09 )%	14.31 %	19.65 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$1,606,001	$1,243,394	$770,434	$641,834	$323,975
Ratios to Average Net Assets:
Total expenses (c)	0.14 %	0.15 %	0.18 %	0.18 %	0.27 %
Net expenses (c)	0.06 %	0.05 %	0.05 %	0.05 %	0.04 %
Net investment income (loss)	2.56 %	2.53 %	1.90 %	2.52 %	2.05 %
Portfolio turnover rate	13 %	9 %	9 %	15 %	18 %

(a)	Net investment income per share is calculated using the average shares method.
(b)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(c)	Does not include expenses of the Underlying Funds in which the Fund invests.

174

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET TARGET RETIREMENT 2055 FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class R3
	Year Ended 12/31/24	Year Ended 12/31/23	For the Period 2/28/22*- 12/31/22
Net asset value, beginning of period	$14.33	$12.37	$14.94
Income (loss) from investment operations:
Net investment income (loss) (a)	0.34	0.26	0.17
Net realized and unrealized gain (loss)	1.41	2.07	(2.18 )
Total from investment operations	1.75	2.33	(2.01 )
Distributions to shareholders from:
Net investment income	(0.30 )	(0.25 )	(0.15 )
Net realized gains	(0.33 )	(0.12 )	(0.41 )
Total distributions	(0.63 )	(0.37 )	(0.56 )
Net asset value, end of period	$15.45	$14.33	$12.37
Total return (b)	12.15 %	18.84 %	(13.40 )%
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$18,510	$12,344	$7,963
Ratios to Average Net Assets:
Total expenses (c)	0.64 %	0.65 %	0.68 %(d)
Net expenses (c)	0.56 %	0.55 %	0.55 %(d)
Net investment income (loss)	2.17 %	1.91 %	1.54 %(d)
Portfolio turnover rate	13 %	9 %	9 %

*	Commencement of operations.
(a)	Net investment income per share is calculated using the average shares method.
(b)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(c)	Does not include expenses of the Underlying Funds in which the Fund invests.
(d)	Annualized.

175

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET TARGET RETIREMENT 2060 FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class I
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$14.45	$12.45	$16.06	$14.69	$12.53
Income (loss) from investment operations:
Net investment income (loss) (a)	0.41	0.33	0.22	0.05	0.59
Net realized and unrealized gain (loss)	1.41	2.06	(3.30 )	1.97	1.87
Total from investment operations	1.82	2.39	(3.08 )	2.02	2.46
Distributions to shareholders from:
Net investment income	(0.36 )	(0.31 )	(0.20 )	(0.29 )	(0.22 )
Net realized gains	(0.28 )	(0.08 )	(0.33 )	(0.36 )	(0.08 )
Total distributions	(0.64 )	(0.39 )	(0.53 )	(0.65 )	(0.30 )
Net asset value, end of period	$15.63	$14.45	$12.45	$16.06	$14.69
Total return (b)	12.57 %	19.22 %	(19.16 )%	13.75 %	19.61 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$932	$853	$588	$633	$3,458
Ratios to Average Net Assets:
Total expenses (c)	0.31 %	0.33 %	0.38 %	0.50 %	0.54 %
Net expenses (c)	0.20 %	0.19 %	0.18 %	0.28 %	0.09 %
Net investment income (loss)	2.61 %	2.41 %	1.60 %	0.33 %	4.41 %
Portfolio turnover rate	14 %	8 %	9 %	13 %	25 %

(a)	Net investment income per share is calculated using the average shares method.
(b)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(c)	Does not include expenses of the Underlying Funds in which the Fund invests.

176

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET TARGET RETIREMENT 2060 FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class K
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$14.51	$12.49	$16.11	$14.69	$12.53
Income (loss) from investment operations:
Net investment income (loss) (a)	0.42	0.36	0.28	0.43	0.27
Net realized and unrealized gain (loss)	1.42	2.07	(3.36 )	1.68	2.19
Total from investment operations	1.84	2.43	(3.08 )	2.11	2.46
Distributions to shareholders from:
Net investment income	(0.38 )	(0.33 )	(0.21 )	(0.33 )	(0.22 )
Net realized gains	(0.28 )	(0.08 )	(0.33 )	(0.36 )	(0.08 )
Total distributions	(0.66 )	(0.41 )	(0.54 )	(0.69 )	(0.30 )
Net asset value, end of period	$15.69	$14.51	$12.49	$16.11	$14.69
Total return (b)	12.67 %	19.45 %	(19.08 )%	14.34 %	19.63 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$1,086,085	$779,090	$432,395	$314,182	$137,392
Ratios to Average Net Assets:
Total expenses (c)	0.16 %	0.19 %	0.25 %	0.28 %	0.49 %
Net expenses (c)	0.06 %	0.05 %	0.05 %	0.05 %	0.04 %
Net investment income (loss)	2.65 %	2.66 %	2.03 %	2.68 %	2.12 %
Portfolio turnover rate	14 %	8 %	9 %	13 %	25 %

(a)	Net investment income per share is calculated using the average shares method.
(b)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(c)	Does not include expenses of the Underlying Funds in which the Fund invests.

177

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET TARGET RETIREMENT 2060 FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class R3
	Year Ended 12/31/24	Year Ended 12/31/23	For the Period 2/11/22*- 12/31/22
Net asset value, beginning of period	$14.51	$12.49	$15.19
Income (loss) from investment operations:
Net investment income (loss) (a)	0.33	0.29	0.20
Net realized and unrealized gain (loss)	1.44	2.06	(2.42 )
Total from investment operations	1.77	2.35	(2.22 )
Distributions to shareholders from:
Net investment income	(0.30 )	(0.25 )	(0.15 )
Net realized gains	(0.28 )	(0.08 )	(0.33 )
Total distributions	(0.58 )	(0.33 )	(0.48 )
Net asset value, end of period	$15.70	$14.51	$12.49
Total return (b)	12.17 %	18.86 %	(14.62 )%
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$8,065	$5,715	$3,179
Ratios to Average Net Assets:
Total expenses (c)	0.66 %	0.69 %	0.75 %(d)
Net expenses (c)	0.56 %	0.55 %	0.55 %(d)
Net investment income (loss)	2.12 %	2.14 %	1.72 %(d)
Portfolio turnover rate	14 %	8 %	9 %

*	Commencement of operations.
(a)	Net investment income per share is calculated using the average shares method.
(b)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(c)	Does not include expenses of the Underlying Funds in which the Fund invests.
(d)	Annualized.

178

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET TARGET RETIREMENT 2065 FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class I
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	For the Period 3/30/20*- 12/31/20
Net asset value, beginning of period	$13.96	$11.96	$15.22	$13.69	$10.00
Income (loss) from investment operations:
Net investment income (loss) (a)	0.18	0.30	0.22	0.31	0.19
Net realized and unrealized gain (loss)	1.59	2.00	(3.15 )	1.62	4.13
Total from investment operations	1.77	2.30	(2.93 )	1.93	4.32
Distributions to shareholders from:
Net investment income	(0.34 )	(0.26 )	(0.17 )	(0.26 )	(0.23 )
Net realized gains	(0.07 )	(0.02 )	(0.16 )	(0.14 )	(0.40 )
Return of capital	—	(0.02 )	—	—	—
Total distributions	(0.41 )	(0.30 )	(0.33 )	(0.40 )	(0.63 )
Net asset value, end of period	$15.32	$13.96	$11.96	$15.22	$13.69
Total return (b)	12.67 %	19.20 %	(19.23 )%	14.09 %	43.15 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$58	$301	$191	$178	$137
Ratios to Average Net Assets:
Total expenses (c)	0.29 %	0.49 %	0.66 %	1.45 %	12.01 %(d)
Net expenses (c)	0.14 %	0.25 %	0.25 %	0.25 %	0.22 %(d)
Net investment income (loss)	1.20 %	2.30 %	1.67 %	2.05 %	2.08 %(d)
Portfolio turnover rate	11 %	8 %	9 %	20 %	86 %(e)

*	Commencement of operations.
(a)	Net investment income per share is calculated using the average shares method.
(b)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(c)	Does not include expenses of the Underlying Funds in which the Fund invests.
(d)	Annualized.
(e)	Not annualized.

179

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET TARGET RETIREMENT 2065 FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class K
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	For the Period 3/30/20*- 12/31/20
Net asset value, beginning of period	$13.96	$11.96	$15.23	$13.69	$10.00
Income (loss) from investment operations:
Net investment income (loss) (a)	0.43	0.37	0.31	0.61	0.45
Net realized and unrealized gain (loss)	1.35	1.96	(3.22 )	1.36	3.88
Total from investment operations	1.78	2.33	(2.91 )	1.97	4.33
Distributions to shareholders from:
Net investment income	(0.36 )	(0.29 )	(0.20 )	(0.29 )	(0.24 )
Net realized gains	(0.07 )	(0.02 )	(0.16 )	(0.14 )	(0.40 )
Return of capital	—	(0.02 )	—	—	—
Total distributions	(0.43 )	(0.33 )	(0.36 )	(0.43 )	(0.64 )
Net asset value, end of period	$15.31	$13.96	$11.96	$15.23	$13.69
Total return (b)	12.75 %	19.43 %	(19.12 )%	14.39 %	43.34 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$344,036	$203,873	$93,596	$43,241	$3,557
Ratios to Average Net Assets:
Total expenses (c)	0.21 %	0.29 %	0.46 %	1.25 %	11.81 %(d)
Net expenses (c)	0.06 %	0.05 %	0.05 %	0.05 %	0.02 %(d)
Net investment income (loss)	2.85 %	2.85 %	2.41 %	4.06 %	4.70 %(d)
Portfolio turnover rate	11 %	8 %	9 %	20 %	86 %(e)

*	Commencement of operations.
(a)	Net investment income per share is calculated using the average shares method.
(b)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(c)	Does not include expenses of the Underlying Funds in which the Fund invests.
(d)	Annualized.
(e)	Not annualized.

180

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET TARGET RETIREMENT 2065 FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class R3
	Year Ended 12/31/24	Year Ended 12/31/23	For the Period 2/28/22*- 12/31/22
Net asset value, beginning of period	$13.99	$11.99	$14.08
Income (loss) from investment operations:
Net investment income (loss) (a)	0.42	0.35	0.34
Net realized and unrealized gain (loss)	1.28	1.90	(2.13 )
Total from investment operations	1.70	2.25	(1.79 )
Distributions to shareholders from:
Net investment income	(0.28 )	(0.22 )	(0.14 )
Net realized gains	(0.07 )	(0.02 )	(0.16 )
Return of Capital	—	(0.01 )	—
Total distributions	(0.35 )	(0.25 )	(0.30 )
Net asset value, end of period	$15.34	$13.99	$11.99
Total return (b)	12.15 %	18.69 %	(12.67 )%
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$1,465	$582	$152
Ratios to Average Net Assets:
Total expenses (c)	0.71 %	0.79 %	0.96 %(d)
Net expenses (c)	0.56 %	0.55 %	0.55 %(d)
Net investment income (loss)	2.78 %	2.66 %	3.26 %(d)
Portfolio turnover rate	11 %	8 %	9 %

*	Commencement of operations.
(a)	Net investment income per share is calculated using the average shares method.
(b)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(c)	Does not include expenses of the Underlying Funds in which the Fund invests.
(d)	Annualized.

181

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET TARGET RETIREMENT 2070 FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class I
	For the Period 12/31/24*- 12/31/24
Net asset value, beginning of period	$10.00
Income (loss) from investment operations:
Net investment income (loss) (a)	(0.00 )(b)
Net realized and unrealized gain (loss)	(0.00 )(b)
Total from investment operations	(0.00 )(b)
Net asset value, end of period	$10.00
Total return (c)	0.00 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$1,000
Ratios to Average Net Assets:
Total expenses (d)	199.54 %(e)
Net expenses (d)	0.04 %(e)
Net investment income (loss)	(0.04 )%(e)
Portfolio turnover rate	0 %(f)

*	Commencement of operations.
(a)	Net investment income per share is calculated using the average shares method.
(b)	Amount is less than $0.005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(d)	Does not include expenses of the Underlying Funds in which the Fund invests.
(e)	Annualized.
(f)	Not annualized.

182

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET TARGET RETIREMENT 2070 FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class K
	For the Period 12/31/24*- 12/31/24
Net asset value, beginning of period	$10.00
Income (loss) from investment operations:
Net investment income (loss) (a)	(0.00 )(b)
Net realized and unrealized gain (loss)	(0.00 )(b)
Total from investment operations	(0.00 )(b)
Net asset value, end of period	$10.00
Total return (c)	0.00 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$1,000
Ratios to Average Net Assets:
Total expenses (d)	199.58 %(e)
Net expenses (d)	0.07 %(e)
Net investment income (loss)	(0.07 )%(e)
Portfolio turnover rate	0 %(f)

*	Commencement of operations.
(a)	Net investment income per share is calculated using the average shares method.
(b)	Amount is less than $0.005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(d)	Does not include expenses of the Underlying Funds in which the Fund invests.
(e)	Annualized.
(f)	Not annualized.

183

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET TARGET RETIREMENT 2070 FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class R3
	For the Period 12/31/24*- 12/31/24
Net asset value, beginning of period	$10.00
Income (loss) from investment operations:
Net investment income (loss) (a)	(0.00 )(b)
Net realized and unrealized gain (loss)	(0.00 )(b)
Total from investment operations	(0.00 )(b)
Net asset value, end of period	$10.00
Total return (c)	0.00 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$1,000
Ratios to Average Net Assets:
Total expenses (d)	199.80 %(e)
Net expenses (d)	0.29 %(e)
Net investment income (loss)	(0.29 )%(e)
Portfolio turnover rate	0 %(f)

*	Commencement of operations.
(a)	Net investment income per share is calculated using the average shares method.
(b)	Amount is less than $0.005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(d)	Does not include expenses of the Underlying Funds in which the Fund invests.
(e)	Annualized.
(f)	Not annualized.

184

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET TARGET RETIREMENT FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class I
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$10.55	$10.03	$12.01	$11.99	$11.05
Income (loss) from investment operations:
Net investment income (loss) (a)	0.38	0.38	0.31	0.17	0.38
Net realized and unrealized gain (loss)	0.37	0.69	(1.77 )	0.65	0.75
Total from investment operations	0.75	1.07	(1.46 )	0.82	1.13
Distributions to shareholders from:
Net investment income	(0.41 )	(0.35 )	(0.31 )	(0.28 )	(0.18 )
Net realized gains	(0.21 )	(0.20 )	(0.21 )	(0.52 )	(0.01 )
Total distributions	(0.62 )	(0.55 )	(0.52 )	(0.80 )	(0.19 )
Net asset value, end of period	$10.68	$10.55	$10.03	$12.01	$11.99
Total return (b)	7.07 %	10.71 %	(12.19 )%	6.87 %	10.25 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$3,351	$3,275	$724	$906	$21,801
Ratios to Average Net Assets:
Total expenses (c)	0.30 %	0.27 %	0.28 %	0.42 %	0.24 %
Net expenses (c)	0.12 %	0.10 %	0.10 %	0.24 %	0.02 %
Net investment income (loss)	3.48 %	3.66 %	2.79 %	1.36 %	3.26 %
Portfolio turnover rate	17 %	13 %	17 %	33 %	24 %

(a)	Net investment income per share is calculated using the average shares method.
(b)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(c)	Does not include expenses of the Underlying Funds in which the Fund invests.

185

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET TARGET RETIREMENT FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class K
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$10.61	$10.09	$12.08	$11.97	$11.03
Income (loss) from investment operations:
Net investment income (loss) (a)	0.39	0.36	0.32	0.30	0.26
Net realized and unrealized gain (loss)	0.39	0.73	(1.78 )	0.64	0.87
Total from investment operations	0.78	1.09	(1.46 )	0.94	1.13
Distributions to shareholders from:
Net investment income	(0.43 )	(0.37 )	(0.32 )	(0.31 )	(0.18 )
Net realized gains	(0.21 )	(0.20 )	(0.21 )	(0.52 )	(0.01 )
Total distributions	(0.64 )	(0.57 )	(0.53 )	(0.83 )	(0.19 )
Net asset value, end of period	$10.75	$10.61	$10.09	$12.08	$11.97
Total return (b)	7.26 %	10.77 %	(12.11 )%	7.92 %	10.29 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$620,511	$671,982	$596,200	$635,314	$491,138
Ratios to Average Net Assets:
Total expenses (c)	0.16 %	0.16 %	0.16 %	0.15 %	0.19 %
Net expenses (c)	(0.02 )%(d)	(0.01 )%(d)	(0.02 )%(d)	(0.03 )%(d)	(0.03 )%(d)
Net investment income (loss)	3.54 %	3.39 %	2.93 %	2.40 %	2.29 %
Portfolio turnover rate	17 %	13 %	17 %	33 %	24 %

(a)	Net investment income per share is calculated using the average shares method.
(b)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(c)	Does not include expenses of the Underlying Funds in which the Fund invests.
(d)	Due to the Fund waiving acquired Fund fees, the waiver exceeded total fund expenses.

186

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET TARGET RETIREMENT FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class R3
	Year Ended 12/31/24	Year Ended 12/31/23	For the Period 2/28/22*- 12/31/22
Net asset value, beginning of period	$10.62	$10.10	$11.59
Income (loss) from investment operations:
Net investment income (loss) (a)	0.37	0.31	0.25
Net realized and unrealized gain (loss)	0.37	0.72	(1.27 )
Total from investment operations	0.74	1.03	(1.02 )
Distributions to shareholders from:
Net investment income	(0.39 )	(0.31 )	(0.26 )
Net realized gains	(0.21 )	(0.20 )	(0.21 )
Total distributions	(0.60 )	(0.51 )	(0.47 )
Net asset value, end of period	$10.76	$10.62	$10.10
Total return (b)	6.88 %	10.21 %	(8.77 )%
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$4,397	$3,243	$2,548
Ratios to Average Net Assets:
Total expenses (c)	0.49 %	0.66 %	0.66 %(d)
Net expenses (c)	0.32 %	0.49 %	0.48 %(d)
Net investment income (loss)	3.37 %	2.97 %	2.76 %(d)
Portfolio turnover rate	17 %	13 %	17 %

*	Commencement of operations.
(a)	Net investment income per share is calculated using the average shares method.
(b)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(c)	Does not include expenses of the Underlying Funds in which the Fund invests.
(d)	Annualized.

187

Appendix A – Underlying Funds

The following is a brief description of the investment objective and principal investment policies of certain of the Underlying Funds in which the Target Retirement Funds may invest. The Funds invest in the Underlying Funds in varying proportions.

You'll find more detailed information about each of these Underlying Fund's investment strategies and risks in its prospectus and SAI. Refer to www.ssga.com or contact your financial advisor for details.

State Street Equity 500 Index II Portfolio

The State Street Equity 500 Index II Portfolio seeks to provide investment results that, before expenses, correspond generally to the total return of the S&P 500® Index. The Portfolio is not managed according to traditional methods of “active” investment management, which involve the buying and selling of securities based upon economic, financial and market analysis and investment judgment. Instead, the Portfolio, using a “passive” or “indexing” investment approach, seeks to provide investment results that, before expenses, correspond generally to the total return of the S&P 500. The Portfolio generally intends to invest in all stocks comprising the S&P 500 in approximate proportion to their weightings in the Index. However, under various circumstances, it may not be possible or practicable to purchase all stocks in those weightings. In those circumstances, the Portfolio may purchase a sample of the stocks in the Index in proportions expected by the Portfolio's investment adviser, SSGA FM, to match generally the performance of the Index as a whole. In addition, from time to time stocks are added to or removed from the Index. The Portfolio may sell securities that are represented in the Index, or purchase securities that are not yet represented in the Index, in anticipation of their removal from or addition to the Index. Under normal circumstances, the Portfolio generally invests substantially all, but at least 80%, of its net assets (plus borrowings, if any) in securities comprising the Index or in securities that the Adviser determines have economic characteristics that are comparable to the economic characteristics of securities that comprise the Index. The notional value of the Portfolio's investments in derivatives or other synthetic instruments that provide exposures comparable, in the judgment of the Adviser, to investments in the Index may be counted toward satisfaction of this 80% policy. In addition, the Portfolio may invest in equity securities that are not included in the Index, cash and cash equivalents or money market instruments, such as repurchase agreements and money market funds (including money market funds advised by the Adviser).

The Portfolio may also enter into other derivatives transactions, including the use of options or swap transactions, in lieu of investing directly in the stocks making up the Index. The Portfolio may also, to the extent permitted by applicable law, invest in shares of other mutual funds whose investment objectives and policies are similar to those of the Portfolio (including funds advised by the Adviser).

State Street Small/Mid Cap Equity Index Portfolio

The State Street Small/Mid Cap Equity Index Portfolio seeks to provide investment results that, before expenses, correspond generally to the total return of an index that tracks the performance of mid-to small- capitalization exchange traded U.S. equity securities. The Portfolio is not managed according to traditional methods of “active” investment management, which involve the buying and selling of securities based upon economic, financial and market analysis and investment judgment. Instead, the Portfolio, using a “passive” or “indexing” investment approach, seeks to provide investment results that, before expenses, correspond generally to the total return of the Russell Small Cap Completeness Index. The Portfolio generally intends to invest in all stocks comprising the Russell Small Cap Completeness Index in approximate proportion to their weightings in the Russell Small Cap Completeness Index. However, under various circumstances, it may not be possible or practicable to purchase all stocks in those weightings. In those circumstances, the Portfolio may purchase a sample of the stocks in the Russell Small Cap Completeness Index in proportions expected by SSGA FM, the investment adviser to the Portfolio, to match generally the performance of the Russell Small Cap Completeness Index as a whole. In addition, from time to time stocks are added to or removed from the Russell Small Cap Completeness Index. The Portfolio may sell securities that are represented in the Russell Small Cap Completeness Index, or purchase securities that are not yet represented in the Russell Small Cap Completeness Index, in anticipation of their removal

188

from or addition to the Russell Small Cap Completeness Index. Under normal market conditions, the Portfolio invests at least 80% of its net assets (plus borrowings, if any) in stocks in the Russell Small Cap Completeness Index. The notional value of the Portfolio's investments in derivatives or other synthetic instruments that provide exposures comparable, in the judgment of the Adviser, to investments in the Russell Small Cap Completeness Index may be counted toward satisfaction of this 80% policy. In addition, the Portfolio may invest in equity securities that are not included in the Index, cash and cash equivalents or money market instruments, such as repurchase agreements and money market funds (including money market funds advised by the Adviser). The Portfolio may purchase or sell futures contracts on the Index, or options on those futures, in lieu of investing directly in the stocks making up the Index. The Portfolio might do so, for example, in order to increase its investment exposure pending investment of cash in the stocks comprising the Index. Alternatively, the Portfolio might use futures or options on futures to reduce its investment exposure in situations where it intends to sell a portion of the stocks in its portfolio but the sale has not yet been completed. The Portfolio may also enter into other derivatives transactions, including the use of options or swap transactions relating to the Index or any securities comprising the Index, in lieu of investing directly in the stocks making up the Index. The Portfolio may, to the extent permitted by applicable law, invest in shares of other mutual funds whose investment objectives and policies are similar to those of the Portfolio (including funds advised by the Adviser).

State Street Global All Cap Equity ex-U.S. Index Portfolio

The State Street Global All Cap Equity ex-U.S. Index Portfolio seeks to provide investment results that, before fees and expenses, correspond generally to the total return performance of a broad-based index of world (ex-U.S.) equity markets over the long term. The Portfolio is an “index” fund that seeks to track, before fees and expenses, the total return performance of the MSCI ACWI ex USA Investable Market Index (the “MSCI ACWI ex USA IMI Index” or sometimes referred to in context as the “Index”) over the long term. As an “index” fund, the Portfolio is not managed according to traditional methods of “active” investment management, which involve the buying and selling of securities based upon economic, financial and market analysis and investment judgment. In seeking to track the performance of the Index, the Portfolio employs a sampling strategy, which means that the Portfolio is not required to purchase all of the securities represented in the Index. Instead, the Portfolio may purchase a subset of the securities in the Index in an effort to hold a portfolio of securities with generally the same risk and return characteristics of the Index. The number of holdings in the Portfolio will be based on a number of factors, including asset size of the Portfolio. The Adviser generally expects the Portfolio to hold fewer than the total number of securities in the Index, but reserves the right to hold as many securities as it believes necessary to achieve the Portfolio's investment objective. Under normal circumstances, the Portfolio generally invests substantially all, but at least 80%, of its net assets (plus borrowings, if any) in securities comprising the Index or in American Depositary Receipts (“ADRs”) or Global Depositary Receipts (“GDRs”) providing exposure to securities comprising the Index. The notional value of the Portfolio's investments in derivatives or other synthetic instruments that provide exposures comparable, in the judgment of the Adviser, to investments in the Index may be counted toward satisfaction of this 80% policy. In addition, the Portfolio may invest in equity securities that are not included in the Index, cash and cash equivalents or money market instruments, such as repurchase agreements and money market funds (including money market funds advised by the Adviser). The Portfolio may also purchase or sell futures contracts, or options on those futures, in lieu of investing directly in the stocks making up the Index. The Portfolio might do so, for example, in order to increase its investment exposure pending investment of cash in stocks or other investments. Alternatively, the Portfolio might use futures or options on futures to reduce its investment exposure in situations where it intends to sell a portion of the stocks in its portfolio but the sale has not yet been completed. The Portfolio may also enter into other derivatives transactions, including the use of options, forwards or swap transactions, in lieu of investing directly in the stocks making up the Index. The Portfolio may also, to the extent permitted by applicable law, invest in shares of other mutual funds whose investment objectives and policies are similar to those of the Portfolio (including funds advised by the Adviser).

SPDR Dow Jones Global Real Estate ETF

The SPDR Dow Jones Global Real Estate ETF seeks to provide investment results that, before fees and expenses, correspond generally to the total return performance of an index based upon the global real estate market. In seeking to track the performance of the Dow Jones Global Select Real Estate Securities Indexsm, the Fund employs a sampling strategy, which means that the Fund is not required to purchase all of the securities represented in the Index. Instead, the Fund may purchase a subset of the securities in the Index in an effort to hold a portfolio of securities with generally the same risk and return characteristics of the Index. The quantity of holdings in the Fund will be based on a number of factors, including asset size of the Fund. Based on its analysis of these factors, SSGA FM, the investment adviser to the Fund, either may invest the Fund's assets in a subset of securities in the Index or may invest the Fund's assets in sub

189

stantially all of the securities represented in the Index in approximately the same proportions as the Index, as determined by the Adviser to be in the best interest of the Fund in pursuing its objective. Under normal market conditions, the Fund generally invests substantially all, but at least 80%, of its total assets in the securities comprising the Index and in depositary receipts ADRs or GDRs based on securities comprising the Index. In addition, in seeking to track the Index, the Fund may invest in equity securities that are not included in the Index (including common stock, preferred stock, depositary receipts and shares of other investment companies), cash and cash equivalents or money market instruments, such as repurchase agreements and money market funds (including money market funds advised by the Adviser). In seeking to track the Index, the Fund's assets will generally be concentrated in an industry or group of industries to the extent that the Index concentrates in a particular industry or group of industries.

SPDR Portfolio Long Term Treasury ETF

The SPDR Portfolio Long Term Treasury ETF seeks to provide investment results that, before fees and expenses, correspond generally to the price and yield performance of an index that tracks the long term (10+ years) sector of the United States Treasury market. In seeking to track the performance of the Bloomberg Long U.S. Treasury Index, the Fund employs a sampling strategy, which means that the Fund is not required to purchase all of the securities represented in the Index. Instead, the Fund may purchase a subset of the securities in the Index in an effort to hold a portfolio of securities with generally the same risk and return characteristics of the Index. The quantity of holdings in the Fund will be based on a number of factors, including asset size of the Fund. Based on its analysis of these factors, SSGA FM, the investment adviser to the Fund, either may invest the Fund's assets in a subset of securities in the Index or may invest the Fund's assets in substantially all of the securities represented in the Index in approximately the same proportions as the Index, as determined by the Adviser to be in the best interest of the Fund in pursuing its objective. Under normal market conditions, the Fund generally invests substantially all, but at least 80%, of its total assets in the securities comprising the Index or in securities that the Adviser determines have economic characteristics that are substantially identical to the economic characteristics of the securities that comprise the Index. In addition, in seeking to track the Index, the Fund may invest in debt securities that are not included in the Index, cash and cash equivalents or money market instruments, such as repurchase agreements and money market funds (including money market funds advised by the Adviser).

State Street Aggregate Bond Index Portfolio

The State Street Aggregate Bond Index Portfolio seeks to provide investment results that, before fees and expenses, correspond generally to the price and yield performance of an index that tracks the U.S. dollar denominated investment-grade bond market over the long term. The Portfolio is an “index” fund that seeks to track, before fees and expenses, the total return performance of the Bloomberg U.S. Aggregate Bond Index over the long term. As an “index” fund, the Portfolio is not managed according to traditional methods of “active” investment management, which involve the buying and selling of securities based upon economic, financial and market analysis and investment judgment.

In seeking to track the performance of the Index, the Portfolio employs a sampling strategy, which means that the Portfolio will not typically purchase all of the securities represented in the Index. Instead, the Portfolio may purchase a subset of the securities in the Index, or securities the Adviser considers to be comparable to securities in the Index, in an effort to hold a portfolio of securities with generally the same risk and return characteristics of the Index. The number of holdings in the Portfolio will be based on a number of factors, including asset size of the Portfolio. SSGA FM, the investment adviser to the Portfolio, generally expects the Portfolio to hold fewer than the total number of securities in the Index, but reserves the right to hold as many securities as it believes necessary to achieve the Portfolio's investment objective. Under normal circumstances, the Portfolio generally invests substantially all, but at least 80%, of its net assets (plus borrowings, if any) in securities comprising the Index or in securities that the Adviser determines have economic characteristics that are comparable to the economic characteristics of securities that comprise the Index. The notional value of the Portfolio's investments in derivatives or other synthetic instruments that provide exposures comparable, in the judgment of the Adviser, to investments in the Index may be counted toward satisfaction of this 80% policy. The Portfolio may also invest in other debt securities, cash and cash equivalents or money market instruments, such as repurchase agreements and money market funds (including money market funds advised by the Adviser). The Portfolio may at times purchase or sell futures contracts on fixed-income securities, or options on those futures, in lieu of investing directly in fixed-income securities themselves. The Portfolio may also purchase or sell futures contracts and related options on the Index (or other fixed-income securities indices). The Portfolio might do so, for example, in order to adjust the interest-rate sensitivity of the Portfolio to bring the characteristics of the Portfolio more closely in line with those of the Index. It might also do so to increase its investment exposure pending investment of cash in bonds or other investments or to reduce its

190

investment exposure in situations where it intends to sell a portion of the securities in its portfolio but the sale has not yet been completed. The Portfolio may also enter into other derivatives transactions, including the use of options or swap transactions, in lieu of investing directly in the stocks making up the Index. The Portfolio may, to the extent permitted by applicable law, invest in shares of other mutual funds whose investment objectives and policies are similar to those of the Portfolio (including funds advised by the Adviser).

SPDR Bloomberg High Yield Bond ETF

The SPDR Bloomberg High Yield Bond ETF seeks to provide investment results that, before fees and expenses, correspond generally to the price and yield performance of an index that tracks the U.S. high yield corporate bond market. In seeking to track the performance of the Bloomberg High Yield Very Liquid Index, the Fund employs a sampling strategy, which means that the Fund is not required to purchase all of the securities represented in the Index. Instead, the Fund may purchase a subset of the securities in the Index in an effort to hold a portfolio of securities with generally the same risk and return characteristics of the Index. The quantity of holdings in the Fund will be based on a number of factors, including asset size of the Fund. Based on its analysis of these factors, SSGA FM, the investment adviser to the Fund, either may invest the Fund's assets in a subset of securities in the Index or may invest the Fund's assets in substantially all of the securities represented in the Index in approximately the same proportions as the Index, as determined by the Adviser to be in the best interest of the Fund in pursuing its objective. Under normal market conditions, the Fund generally invests substantially all, but at least 80%, of its total assets in the securities comprising the Index or in securities that the Adviser determines have economic characteristics that are substantially identical to the economic characteristics of the securities that comprise the Index. In addition, in seeking to track the Index, the Fund may invest in debt securities that are not included in the Index, cash and cash equivalents or money market instruments, such as repurchase agreements and money market funds (including money market funds advised by the Adviser). In seeking to track the Index, the Fund's assets will generally be concentrated in an industry or group of industries to the extent that the Index concentrates in a particular industry or group of industries. The Fund may use derivatives, including credit default swaps and credit default index swaps, to obtain investment exposure that the Adviser expects to correlate closely with the Index, or a portion of the Index, and in managing cash flows.

SPDR Portfolio Short Term Treasury ETF

The SPDR Portfolio Short Term Treasury ETF seeks to provide investment results that, before fees and expenses, correspond generally to the price and yield performance of an index that tracks the short term sector of the United States Treasury market. In seeking to track the performance of the Bloomberg 1-3 Year U.S. Treasury Index, the Fund employs a sampling strategy, which means that the Fund is not required to purchase all of the securities represented in the Index. Instead, the Fund may purchase a subset of the securities in the Index in an effort to hold a portfolio of securities with generally the same risk and return characteristics of the Index. The quantity of holdings in the Fund will be based on a number of factors, including asset size of the Fund. Based on its analysis of these factors, SSGA FM, the investment adviser to the Fund, either may invest the Fund's assets in a subset of securities in the Index or may invest the Fund's assets in substantially all of the securities represented in the Index in approximately the same proportions as the Index, as determined by the Adviser to be in the best interest of the Fund in pursuing its objective. Under normal market conditions, the Fund generally invests substantially all, but at least 80%, of its total assets in the securities comprising the Index or in securities that the Adviser determines have economic characteristics that are substantially identical to the economic characteristics of the securities that comprise the Index. In addition, in seeking to track the Index, the Fund may invest in debt securities that are not included in the Index, cash and cash equivalents or money market instruments, such as repurchase agreements and money market funds (including money market funds advised by the Adviser).

SPDR Portfolio Short Term Corporate Bond ETF

The SPDR Portfolio Short Term Corporate Bond ETF seeks to provide investment results that, before fees and expenses, correspond generally to the price and yield performance of an index that tracks the short-term U.S. corporate bond market. In seeking to track the performance of the Bloomberg U.S. 1-3 Year Corporate Bond Index, the Fund employs a sampling strategy, which means that the Fund is not required to purchase all of the securities represented in the Index. Instead, the Fund may purchase a subset of the securities in the Index in an effort to hold a portfolio of securities with generally the same risk and return characteristics of the Index. The quantity of holdings in the Fund will be based on a number of factors, including asset size of the Fund. Based on its analysis of these factors, SSGA FM, the investment

191

adviser to the Fund, either may invest the Fund's assets in a subset of securities in the Index or may invest the Fund's assets in substantially all of the securities represented in the Index in approximately the same proportions as the Index, as determined by the Adviser to be in the best interest of the Fund in pursuing its objective.

Under normal market conditions, the Fund generally invests substantially all, but at least 80%, of its total assets in the securities comprising the Index or in securities that the Adviser determines have economic characteristics that are substantially identical to the economic characteristics of the securities that comprise the Index. In addition, in seeking to track the Index, the Fund may invest in debt securities that are not included in the Index, cash and cash equivalents or money market instruments, such as repurchase agreements and money market funds (including money market funds advised by the Adviser). In seeking to track the Index, the Fund's assets will generally be concentrated in an industry or group of industries to the extent that the Index concentrates in a particular industry or group of industries. The Fund may use derivatives, including credit default swaps and credit default index swaps, to obtain investment exposure that the Adviser expects to correlate closely with the Index, or a portion of the Index, and in managing cash flows.

SPDR Bloomberg 1-10 Year TIPS ETF

The SPDR Bloomberg 1-10 Year TIPS ETF seeks to provide investment results that, before fees and expenses, correspond generally to the price and yield performance of an index that tracks the 1-10 year inflation protected sector of the United States Treasury market. In seeking to track the performance of the Bloomberg 1-10 Year U.S. Government Inflation-Linked Bond Index, the Fund employs a sampling strategy, which means that the Fund is not required to purchase all of the securities represented in the Index. Instead, the Fund may purchase a subset of the securities in the Index in an effort to hold a portfolio of securities with generally the same risk and return characteristics of the Index. The quantity of holdings in the Fund will be based on a number of factors, including asset size of the Fund. Based on its analysis of these factors, SSGA FM, the investment adviser to the Fund, either may invest the Fund's assets in a subset of securities in the Index or may invest the Fund's assets in substantially all of the securities represented in the Index in approximately the same proportions as the Index, as determined by the Adviser to be in the best interest of the Fund in pursuing its objective.

SPDR Bloomberg Enhanced Roll Yield Commodity Strategy No K-1 ETF

The SPDR Bloomberg Enhanced Roll Yield Commodity Strategy No K-1 ETF seeks to provide investment results that, before fees and expenses, correspond generally to the total return performance of an index composed of a broad range of commodity exposures. The Fund seeks to track the performance of the Bloomberg Enhanced Roll Yield Total Return Index (the “Index”). Under normal market conditions, the Fund generally invests substantially all, but at least 80%, of its net assets (plus borrowings, if any), directly or indirectly, in securities and/or other instruments comprising the index it seeks to track or in instruments providing exposure to securities and/or other instruments comprising the index it seeks to track. Prior to any change in this 80% investment policy, the Fund will provide shareholders with 60 days' notice. The Fund seeks to achieve its investment objective primarily through exposure to commodity-linked derivative instruments based on the Index. The Fund expects to gain exposure to these investments by investing in a wholly-owned subsidiary, an exempted limited company organized under the laws of the Cayman Islands (“Subsidiary”). The Fund may, to a lesser extent, invest directly in these instruments. The Fund expects to obtain a substantial amount of its exposure to the investment results of the Index through direct or indirect investments in total return swaps that provide returns similar to the commodity futures contracts in the Index. The Subsidiary and Fund may also invest in other commodity-linked derivative instruments, including futures contracts. The performance of these commodity-linked derivative instruments is expected to correspond to the performance of the Index, without requiring the Fund to invest directly in commodities. The Subsidiary and the Fund may also invest in cash and cash equivalents (including U.S. treasury obligations) or money market instruments (including money market funds advised by SSGA FM), which are intended to provide liquidity, preserve capital, and serve as collateral for the Subsidiary's or Fund's derivative instruments.

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The Subsidiary is managed by SSGA Funds Management, Inc. (“SSGA FM” or the “Adviser”), the investment adviser to the Fund, and has the same investment strategy as the Fund. The Fund's investments in the Subsidiary generally provide the Fund with exposure to commodity-linked derivatives instruments within the limits of the federal tax laws, which limit the ability of investment companies like the Fund to invest directly in such instruments. The Fund will not invest more than 25% of the value of its total assets in the Subsidiary.

Index/Trademark Licenses/Disclaimers

S&P INDICES: The S&P 500 Index and the Dow Jones Global Select Real Estate Securities Index (the “Indices”) are products of S&P Dow Jones Indices LLC, (“SPDJI”), a division of S&P Global or its affiliates, and have been licensed for use by the Adviser. “S&P”, “Standard & Poor's” are registered trademarks of Standard & Poor's Financial Services LLC (“S&P'), a division of S&P Global; "Global Dow” is a registered trademark of Dow Jones Trademark Holdings LLC (“Dow Jones”); and these marks, together with the names of the S&P Indices, have been licensed for use by SPDJI and sub-licensed for use by the Adviser.

The State Street Equity 500 Index II Portfolio and the SPDR Dow Jones Global Real Estate ETF are not sponsored, endorsed, sold or marketed by SPDJI, Dow Jones, S&P, any of their respective affiliates (collectively, “S&P Dow Jones Indices”). S&P Dow Jones Indices does not make any representation or warranty, express or implied, to the owners of the State Street Equity 500 Index II Portfolio and the SPDR Dow Jones Global Real Estate ETF or any member of the public regarding the advisability of investing in securities generally or in the State Street Equity 500 Index II Portfolio and the SPDR Dow Jones Global Real Estate ETF particularly or the ability of the Index to track general market performance. S&P Dow Jones Indices licenses to Licensee the Index and certain trademarks, service marks and/or trade names of S&P Dow Jones Indices and/or its licensors. The Index is determined, composed and calculated by S&P Dow Jones Indices without regard to Licensee or the State Street Equity 500 Index II Portfolio and the SPDR Dow Jones Global Real Estate ETF. S&P Dow Jones Indices has no obligation to take the needs of Licensee or the owners of the State Street Equity 500 Index II Portfolio and the SPDR Dow Jones Global Real Estate ETF into consideration in determining, composing or calculating the Index. S&P Dow Jones Indices is not responsible for and has not participated in the determination of the prices, and amount of the State Street Equity 500 Index II Portfolio and the SPDR Dow Jones Global Real Estate ETF or the timing of the issuance or sale of the State Street Equity 500 Index II Portfolio and the SPDR Dow Jones Global Real Estate ETF or in the determination or calculation of the equation by which the State Street Equity 500 Index II Portfolio and the SPDR Dow Jones Global Real Estate ETF is to be converted into cash, surrendered or redeemed, as the case may be. S&P Dow Jones Indices has no obligation or liability in connection with the administration, marketing or trading of the State Street Equity 500 Index II Portfolio and the SPDR Dow Jones Global Real Estate ETF. S&P Dow Jones Indices LLC is not an investment or tax advisor. Inclusion of a security within an index is not a recommendation by S&P Dow Jones Indices to buy, sell, or hold such security, nor is it considered to be investment advice.

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NEITHER S&P DOW JONES INDICES NOR THIRD PARTY LICENSOR GUARANTEES THE ADEQUACY, ACCURACY, TIMELINESS AND/OR THE COMPLETENESS OF THE INDEX OR ANY DATA RELATED THERETO OR ANY COMMUNICATION, INCLUDING BUT NOT LIMITED TO, ORAL OR WRITTEN COMMUNICATION (INCLUDING ELECTRONIC COMMUNICATIONS) WITH RESPECT THERETO. S&P DOW JONES INDICES AND THIRD PARTY LICENSOR SHALL NOT BE SUBJECT TO ANY DAMAGES OR LIABILITY FOR ANY ERRORS, OMISSIONS, OR DELAYS THEREIN. S&P DOW JONES INDICES AND THIRD PARTY LICENSOR MAKES NO EXPRESS OR IMPLIED WARRANTIES, AND EXPRESSLY DISCLAIMS ALL WARRANTIES, OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR USE OR AS TO RESULTS TO BE OBTAINED BY LICENSEE, OWNERS OF THE STATE STREET EQUITY 500 INDEX II PORTFOLIO AND THE SPDR DOW JONES GLOBAL REAL ESTATE ETF, OR ANY OTHER PERSON OR ENTITY FROM THE USE OF THE INDICES OR WITH RESPECT TO ANY DATA RELATED THERETO. WITHOUT LIMITING ANY OF THE FOREGOING, IN NO EVENT WHATSOEVER SHALL S&P DOW JONES INDEX OR THIRD PARTY LICENSOR BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES INCLUDING BUT NOT LIMITED TO, LOSS OF PROFITS, TRADING LOSSES, LOST TIME OR GOODWILL, EVEN IF THEY HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES, WHETHER IN CONTRACT, TORT, STRICT LIABILITY, OR OTHERWISE. THERE ARE NO THIRD PARTY BENEFICIARIES OF ANY AGREEMENTS OR ARRANGEMENTS BETWEEN S&P DOW JONES INDICES AND LICENSEE, OTHER THAN THE LICENSORS OF S&P DOW JONES INDICES.

“Bloomberg®” and the Bloomberg 1-3 Year U.S. Treasury Index, Bloomberg 3-10 Year U.S. Treasury Index, Bloomberg 1-10 Year U.S. Government Inflation-Linked Bond Index, Bloomberg Long U.S. Treasury Index, Bloomberg U.S. 1-3 Year Corporate Bond Index, Bloomberg U.S. Aggregate Bond Index, Bloomberg High Yield Very Liquid Index, (collectively, the “Bloomberg Indices”) are service marks of Bloomberg Finance L.P. and its affiliates, including Bloomberg Index Services Limited (“BISL”), the administrator of the Bloomberg Indices (collectively, “Bloomberg”), and have been licensed for use for certain purposes by the Licensee.

The SPDR Bloomberg 1-10 Year TIPS ETF and SPDR Bloomberg High Yield Bond ETF, along with other products advised by an affiliate of the Licensee (collectively, the “Products”) are not sponsored, endorsed, sold or marketed by Bloomberg. Bloomberg does not make any representation or warranty, express or implied, to the owners of or counterparties to the Products or any member of the public regarding the advisability of investing in securities generally or in the Products particularly. The only relationship of Bloomberg to the Licensee in respect of the Bloomberg Indices is the licensing of certain trademarks, trade names and service marks and of the Bloomberg Indices, which are determined, composed and calculated by BISL without regard to the Licensee or the Products. Bloomberg has no obligation to take the needs of the Licensee or the owners of the Products into consideration in determining, composing or calculating the Bloomberg Indices. Bloomberg is not responsible for and has not participated in the determination of the timing, price, or quantities of the Products to be issued. Bloomberg shall not have any obligation or liability, including, without limitation, to the Products' customers, in connection with the administration, marketing or trading of the Products.

BLOOMBERG DOES NOT GUARANTEE THE ACCURACY AND/OR THE COMPLETENESS OF THE BLOOMBERG INDICES OR ANY DATA RELATED THERETO AND SHALL HAVE NO LIABILITY FOR ANY ERRORS, OMISSIONS OR INTERRUPTIONS THEREIN. BLOOMBERG DOES NOT MAKE ANY WARRANTY, EXPRESS OR IMPLIED, AS TO RESULTS TO BE OBTAINED BY THE LICENSEE, OWNERS OF THE PRODUCTS OR ANY OTHER PERSON OR ENTITY FROM THE USE OF THE BLOOMBERG INDICES OR ANY DATA RELATED THERETO. BLOOMBERG DOES NOT MAKE ANY EXPRESS OR IMPLIED WARRANTIES AND EXPRESSLY DISCLAIMS ALL WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR USE WITH RESPECT TO THE BLOOMBERG INDICES OR ANY DATA RELATED THERETO. WITHOUT LIMITING ANY OF THE FOREGOING, TO THE MAXIMUM EXTENT ALLOWED BY LAW, BLOOMBERG, ITS LICENSORS, AND ITS AND THEIR RESPECTIVE EMPLOYEES, CONTRACTORS, AGENTS, SUPPLIERS, AND VENDORS SHALL HAVE NO LIABILITY OR RESPONSIBILITY WHATSOEVER FOR ANY INJURY OR DAMAGES—WHETHER DIRECT, INDIRECT, CONSEQUENTIAL, INCIDENTAL, PUNITIVE OR OTHERWISE—ARISING IN CONNECTION WITH THE PRODUCTS OR BLOOMBERG INDICES OR ANY DATA OR VALUES RELATING THERETO—WHETHER ARISING FROM THEIR NEGLIGENCE OR OTHERWISE, EVEN IF NOTIFIED OF THE POSSIBILITY THEREOF.

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NONE OF THE MSCI PARTIES MAKES ANY REPRESENTATION OR WARRANTY, EXPRESS OR IMPLIED, TO THE ISSUER OR OWNERS OF THE MSCI FUNDS OR ANY OTHER PERSON OR ENTITY REGARDING THE ADVISABILITY OF INVESTING IN FUNDS GENERALLY OR IN THE MSCI FUNDS PARTICULARLY OR THE ABILITY OF ANY MSCI INDEX TO TRACK CORRESPONDING STOCK MARKET PERFORMANCE. MSCI OR ITS AFFILIATES ARE THE LICENSORS OF CERTAIN TRADEMARKS, SERVICE MARKS AND TRADE NAMES AND OF THE MSCI INDICES WHICH ARE DETERMINED, COMPOSED AND CALCULATED BY MSCI WITHOUT REGARD TO THE MSCI FUNDS OR THE ISSUER OR OWNERS OF THE MSCI FUNDS OR ANY OTHER PERSON OR ENTITY. NONE OF THE MSCI PARTIES HAS ANY OBLIGATION TO TAKE THE NEEDS OF THE ISSUER OR OWNERS OF THE MSCI FUNDS OR ANY OTHER PERSON OR ENTITY INTO CONSIDERATION IN DETERMINING, COMPOSING OR CALCULATING THE MSCI INDICES. NONE OF THE MSCI PARTIES IS RESPONSIBLE FOR OR HAS PARTICIPATED IN THE DETERMINATION OF THE TIMING OF, PRICES AT, OR QUANTITIES OF THE MSCI FUNDS TO BE ISSUED OR IN THE DETERMINATION OR CALCULATION OF THE EQUATION BY OR THE CONSIDERATION INTO WHICH THE MSCI FUNDS ARE REDEEMABLE. FURTHER, NONE OF THE MSCI PARTIES HAS ANY OBLIGATION OR LIABILITY TO THE ISSUER OR OWNERS OF THE MSCI FUNDS OR ANY OTHER PERSON OR ENTITY IN CONNECTION WITH THE ADMINISTRATION, MARKETING OR OFFERING OF THE MSCI FUNDS.

SPDR Trademark. The “SPDR” trademark is used under license from Standard & Poor's Financial Services LLC (“S&P”). No Fund offered by the Trust or its affiliates is sponsored, endorsed, sold or marketed by S&P or its affiliates. S&P makes no representation or warranty, express or implied, to the owners of any Fund or any member of the public regarding the advisability of investing in securities generally or in the Funds particularly or the ability of the Index on which the Fund is based to track general stock market performance. S&P is not responsible for and has not participated in any determination or calculation made with respect to issuance or redemption of Fund Shares. S&P has no obligation or liability in connection with the administration, marketing or trading of the Funds.

WITHOUT LIMITING ANY OF THE FOREGOING, IN NO EVENT SHALL S&P HAVE ANY LIABILITY FOR ANY SPECIAL, PUNITIVE, INDIRECT, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, LOST PROFITS), EVEN IF NOTIFIED OF THE POSSIBILITY OF SUCH DAMAGES.

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Contacting the State Street Funds

Online:	www.ssga.com	24 hours a day, 7 days a week
Phone:	(800) 647-7327	Monday – Friday 8:00 am – 6:00 pm EST

Written requests should be sent to:

Regular mail	Overnight/Registered, Express, Certified Mail
State Street Funds P.O. Box 219737 Kansas City, MO 64121-9737	State Street Funds 801 Pennsylvania Avenue, Suite 219737 Kansas City, MO 64105-1307

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For more information about the Funds:

SSGA Funds Management, Inc

ONE IRON STREET

BOSTON, MASSACHUSETTS 02210

SSITTDSTATPROThe State Street Institutional Investment Trust's Investment Company Act File Number is 811-09819.

Prospectus

April 30, 2025

State Street Institutional
Investment Trust

State Street Institutional U.S. Government Money Market Fund: Class G (SSOXX)

The U.S. Securities and Exchange Commission has not approved or disapproved these securities or passed upon the adequacy of this Prospectus. Any representation to the contrary is a criminal offense.

An investment in the Fund offered by this Prospectus is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

The Fund offers multiple classes of shares. This Prospectus covers only the Class G Shares.

TABLE OF CONTENTS

Fund Summary	1
State Street Institutional U.S. Government Money Market Fund	1
Additional Information About Investment Objective, Principal Strategies and Risks	7
Additional Information About Non-Principal Investment Strategies and Risks	13
Portfolio Holdings Disclosure	15
Management and Organization	16
Shareholder Information	18
Dividends, Distributions and Tax Considerations	23
Financial Intermediary Arrangements	25
Financial Highlights	27

State Street Institutional U.S. Government Money Market Fund

Investment Objective

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Management Fee	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%
Other Expenses	0.02%
Total Annual Fund Operating Expenses	0.07%

Example:

1 year	3 years	5 years	10 years
$7	$23	$40	$90

Principal Investment Strategies

The Fund is a government money market fund and invests only in obligations issued or guaranteed as to principal and/or interest, as applicable, by the U.S. government or its agencies and instrumentalities, as well as repurchase agreements secured by such instruments. The Fund may hold a portion of its assets in cash pending investment, to satisfy redemption requests or to meet the Fund's other cash management needs.

minimal credit risk), to maintain a maximum dollar-weighted average maturity and dollar-weighted average life of sixty (60) days or less and 120 days or less, respectively, and to meet requirements as to portfolio diversification and liquidity. All securities held by the Fund are U.S. dollar-denominated, and they may have fixed, variable or floating interest rates.

The Fund attempts to meet its investment objective by investing in:

•

Repurchase agreements collateralized by U.S. government securities.

Principal Risks

addition, a large number of shareholders collectively may purchase or redeem Portfolio or Fund shares in large amounts rapidly or unexpectedly (collectively, such transactions are referred to as “large shareholder transactions”). Large shareholder transactions could adversely affect the ability of the Portfolio or Fund to conduct its investment program.

Performance

The bar chart and table below provide some indication of the risks of investing in the U.S. Government Fund by illustrating the variability of the Fund's returns for Class G shares from year-to-year. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (877) 521-4083 or by visiting our website at www.ssga.com.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	1.35%	Q4 2023
Lowest Quarterly Return	0.00%	Q2 2015

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Ten Years
Class G	5.27 %	2.47 %	1.74 %

To obtain the Fund's current yield, please call (877) 521-4083.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Class G
To establish an account	$1,000,000,000
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

You may purchase or redeem Fund Shares by written request or wire transfer. Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Telephone:

By Intermediary:

Financial Intermediaries may contact SS&C GIDS, Inc. at (877) 332-6207 or via email at nsccresearch@dstsystems.com with questions.

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

Additional Information About Investment Objective, Principal Strategies and Risks

Investment Objective

The investment objective of the U.S. Government Fund, as stated in the Fund Summary, may be changed without shareholder approval.

U.S. Government Fund

Principal Investment Strategies

The Fund is a government money market fund and invests only in obligations issued or guaranteed as to principal and/or interest, as applicable, by the U.S. government or its agencies and instrumentalities, as well as repurchase agreements secured by such instruments. The Fund will provide shareholders with at least sixty (60) days' prior notice of any change in this investment policy. The Fund may hold a portion of its assets in cash pending investment, to satisfy redemption requests or to meet the Fund's other cash management needs.

The Fund follows a disciplined investment process that attempts to provide stability of principal, liquidity and current income, by investing in U.S. government securities. Among other things, SSGA FM conducts its own credit analyses of potential investments and portfolio holdings, and relies substantially on a dedicated short-term credit research team. The Fund invests in accordance with regulatory requirements applicable to money market funds. Regulations require, among other things, a money market fund to invest only in short-term, high quality debt obligations (generally, securities that have remaining maturities of 397 calendar days or less, with the exception of certain floating rate securities that may have final maturities longer than 397 days but use maturity shortening provisions to meet the 397 day requirement, and that the Fund believes present minimal credit risk), to maintain a maximum dollar-weighted average maturity and dollar-weighted average life of sixty (60) days or less and 120 days or less, respectively, and to meet requirements as to portfolio diversification and liquidity. All securities held by the Fund are U.S. dollar-denominated, and they may have fixed, variable or floating interest rates.

The Fund attempts to meet its investment objective by investing in:

•

Repurchase agreements collateralized by U.S. government securities.

Additional Information About Risks

The Fund is subject to the following principal risks. The risks are described in alphabetical order and not in the order of importance or potential exposure.

Counterparty Risk. The Fund will be subject to credit risk with respect to the counterparties with which the Fund enters into repurchase agreements and other transactions. If a counterparty fails to meet its contractual obligations, the Fund may be unable to terminate the transaction, and it may be delayed or prevented from realizing on any collateral in the event of a bankruptcy or insolvency proceeding relating to the counterparty.

It includes the risk that the security will be downgraded by a credit rating agency; generally, lower credit quality issuers present higher credit risks. An actual or perceived decline in creditworthiness of an issuer of a fixed-income security held by the Fund may result in a decrease in the value of the security. It is possible that the ability of an issuer to meet its obligations will decline substantially during the period when the Fund owns securities of the issuer or that the issuer will default on its obligations or that the obligations of the issuer will be limited or restructured.

The credit rating assigned to any particular investment does not necessarily reflect the issuer's current financial condition and does not reflect an assessment of an investment's volatility or liquidity. Securities rated in the lowest category of investment-grade are considered to have speculative characteristics. If a security held by the Fund loses its rating or its rating is downgraded, the Fund may nonetheless continue to hold the security in the discretion of the Adviser. In the case of asset-backed or mortgage-related securities, changes in the actual or perceived ability of the obligors on the underlying assets or mortgages to make payments of interest and/or principal may affect the values of those securities.

Debt Securities Risk. The values of debt securities may increase or decrease as a result of the following: market fluctuations, changes in interest rates, actual or perceived inability or unwillingness of issuers, guarantors or liquidity providers to make scheduled principal or interest payments or illiquidity in debt securities markets. To the extent that interest rates rise, certain underlying obligations may be paid off substantially slower than originally anticipated and the value of those securities may fall sharply. A rising interest rate environment may cause the value of the Fund's fixed income securities to decrease, an adverse impact on the liquidity of the Fund's fixed income securities, and increased volatility of the fixed income markets. During periods when interest rates are at low levels, the Fund's yield can be low, and the Fund may have a negative yield (i.e., it may lose money on an operating basis). To the extent that interest rates fall, certain underlying obligations may be paid off substantially faster than originally anticipated. If the principal on a debt obligation is prepaid before expected, the prepayments of principal may have to be reinvested in obligations paying interest at lower rates. During periods of falling interest rates, the income received by the Fund may decline. Changes in interest rates will likely have a greater effect on the values of debt securities of longer durations. Returns on investments in debt securities could trail the returns on other investment options, including investments in equity securities. High levels of inflation and/or a significantly changing interest rate environment can lead to heightened levels of volatility and reduced liquidity.

Income Risk. The Fund's income may decline due to falling interest rates or other factors. Issuers of securities held by the Fund may call or redeem the securities during periods of falling interest rates, and the Fund would likely be required to reinvest in securities paying lower interest rates. If an obligation held by the Fund is prepaid, the Fund may have to reinvest the prepayment in other obligations paying income at lower rates. A reduction in the income earned by the Fund may limit the Fund's ability to achieve its objective.

sensitive to interest rate changes, which can affect not only their prices but can also change the income flows and repayment assumptions about those investments. Variable and floating rate securities also generally increase or decrease in value in response to changes in interest rates, although generally to a lesser degree than fixed-rate securities. A substantial increase in interest rates may also have an adverse impact on the liquidity of a security, especially those with longer durations. Changes in governmental policy, including changes in central bank monetary policy, could cause interest rates to rise rapidly, or cause investors to expect a rapid rise in interest rates. This could lead to heightened levels of interest rate, volatility and liquidity risks for the fixed income markets generally and could have a substantial and immediate effect on the values of the Fund's investments. High levels of inflation and/or a significantly changing interest rate environment can lead to heightened levels of volatility and reduced liquidity.

Large Transactions Risk. To the extent a large proportion of the interests of the Portfolio or Fund are highly concentrated or held by a small number of investors (or a single investor), including funds or accounts over which the Adviser has investment discretion, the Fund is subject to the risk that these investors will purchase or redeem Portfolio or Fund interests in large amounts rapidly or unexpectedly, including as a result of an asset allocation decision made by the Adviser. In addition, a large number of shareholders collectively may purchase or redeem Portfolio or Fund shares in large amounts rapidly or unexpectedly (collectively, such transactions are referred to as “large shareholder transactions”). Large shareholder transactions could adversely affect the ability of the Fund to conduct its investment program. For example, they could require the Portfolio or Fund to sell portfolio securities or purchase portfolio securities unexpectedly and incur substantial transaction costs and/or accelerate the realization of taxable income and/or gains to investors. The effects of taxable income and/or gains resulting from large shareholder transactions would particularly impact non-redeeming shareholders who do not hold their Fund shares in an IRA, 401(k) plan or other tax-advantaged plan. To the extent that such transactions result in short-term capital gains, such gains will generally be taxed at the ordinary income tax rate for shareholders who hold Fund shares in a taxable account. In addition, the Portfolio or the Fund may be required to sell its more liquid portfolio investments to meet a large redemption, in which case the Fund's remaining assets may be less liquid, more volatile, and more difficult to price. The Portfolio or Fund may hold a relatively large proportion of its assets in cash in anticipation of large redemptions, diluting its investment returns. A number of circumstances may cause the Portfolio or the Fund to experience large redemptions, such as changes in investors' circumstances; changes in the eligibility criteria for the Portfolio or the Fund or share class of the Fund; liquidations, reorganizations, repositionings, or other announced Portfolio or Fund events; or changes in investment objectives, strategies, policies, risks, or investment personnel.

Low Short-Term Interest Rate Risk. During market conditions in which short-term interest rates are at low levels the Fund's yield can be very low. During these conditions, it is possible that the Fund will generate an insufficient amount of income to pay its expenses, and that it will not be able to pay a daily dividend and may have a negative yield (i.e., it may lose money on an operating basis). It is possible that the Fund would, during these conditions, maintain a substantial portion of its assets in cash, on which it may earn little, if any, income.

Market Disruption and Geopolitical Risk. The Fund is subject to the risk that geopolitical events will disrupt securities markets and adversely affect global economies and markets. War, terrorism, and related geopolitical events have led, and in the future may lead, to increased short-term market volatility and may have adverse long-term effects on U.S. and world economies and markets generally. Likewise, trade policy changes or disputes, natural and environmental disasters, pandemics and epidemics, and systemic market dislocations may be highly disruptive to economies and markets. Those events, as well as other changes in foreign and domestic economic and political conditions, also could adversely affect individual issuers or related groups of issuers, securities markets, interest rates, credit ratings, inflation, investor sentiment, and other factors affecting the value of the Fund's investments. Given the increasing interdependence among global economies and markets, conditions in one country, market, or region might adversely affect markets, issuers, and/or foreign exchange rates in other countries, including the U.S. Any partial or complete dissolution of the Economic and Monetary Union of the European Union, or any increased uncertainty as to its status, could have significant adverse effects on currency and financial markets, and on the values of the Fund's investments. On January 31, 2020, the United Kingdom (“UK”) formally withdrew from the European Union (“EU”) (commonly known as “Brexit”). An agreement between the UK and the EU governing their future trade relationship became effective January 1, 2021, but that agreement does not include an agreement on financial services, and it is unlikely that such agreement will be concluded. Moreover, the UK government has started a program of financial services law reform with the ultimate aim of repealing many EU financial services laws that were assimilated into UK law from January 1, 2021, and replacing them with legislation or rules made by the UK government or financial services regulators. Accordingly, uncertainty remains in certain areas as to the future relationship between the UK and the EU. Brexit has already had a significant impact on the UK, Europe, and global economies, and could continue to result in volatility and illiquidity, legal, political, economic and regulatory uncertainties

and lower economic growth for these economies that could in turn have an adverse effect on the value of the Fund's investments. Any further exits from the EU, or the possibility of such exits, or the abandonment of the euro, may cause additional market disruption globally and introduce new legal and regulatory uncertainties.

Securities and financial markets may be susceptible to market manipulation or other fraudulent trade practices, which could disrupt the orderly functioning of these markets or adversely affect the values of investments traded in these markets, including investments held by the Fund. To the extent the Fund has focused its investments in the market or index of a particular region, adverse geopolitical and other events could have a disproportionate impact on the Fund.

Market Volatility; Government Intervention Risk. Market dislocations and other external events, such as the failures or near failures of significant financial institutions, dislocations in investment or currency markets, corporate or governmental defaults or credit downgrades, or poor collateral performance, may subject the Fund to significant risk of substantial volatility and loss. Governmental and regulatory authorities have taken, and may in the future take, actions to provide or arrange credit supports to financial institutions whose operations have been compromised by credit market dislocations and to restore liquidity and stability to financial systems in their jurisdictions; the implementation of such governmental interventions and their impact on both the markets generally and the Fund's investment program in particular can be uncertain. Governmental and non-governmental issuers may default on, or be forced to restructure, their debts, and other issuers may face difficulties obtaining credit. Defaults or restructurings by governments or others of their debts could have substantial adverse effects on economies, financial markets, and asset valuations around the world. Federal Reserve or other U.S. or non-U.S. governmental or central bank actions, including interest rate increases or contrary actions by different governments, or investor perception that these efforts are not succeeding, could negatively affect financial markets generally as well as the values and liquidity of certain securities.

Master/Feeder Structure Risk. The Fund pursues its objective by investing substantially all of its assets in another pooled investment vehicle (a “master fund”). The ability of the Fund to meet its investment objective is directly related to the ability of the master fund to meet its investment objective. The ability of the Fund to meet its objective may be adversely affected by the purchase and redemption activities of other investors in the master fund. The ability of the Fund to meet redemption requests will depend on its ability to redeem its interest in the master fund. The Adviser or an affiliate serves as investment adviser to the master fund, leading to potential conflicts of interest. For example, the Adviser or its affiliates will receive fees based on the amount of assets invested in the master fund. Investment by the Fund in the master fund may be beneficial in the management of the master fund, by helping to achieve economies of scale or enhancing cash flows. Due to this and other factors, the Adviser may have an incentive to invest the Fund's assets in a master fund sponsored or managed by the Adviser or its affiliates in lieu of investments by the Fund directly in portfolio securities, or may have an incentive to invest in such master fund over a master fund sponsored or managed by others. Similarly, the Adviser may have an incentive to delay or decide against the sale of interests held by the Fund in a master fund sponsored or managed by the Adviser or its affiliates. It is possible that other clients of the Adviser or its affiliates will purchase or sell interests in a master fund sponsored or managed by the Adviser or its affiliates at prices and at times more favorable than those at which the Fund does so. The Fund will bear its pro rata portion of the expenses incurred by the master fund.

Money Market Fund Regulatory Risk. Money market funds and the securities they invest in are subject to comprehensive regulations. The SEC has adopted amendments to money market fund regulation that, among other things, increase the daily and weekly liquid asset requirements (“Money Market Fund Reform”). Money Market Fund Reform permits government money market funds (such as the Fund), that are experiencing a negative gross yield as a result of negative interest rates, to either convert from a stable share price to a floating share price or reduce the number of shares outstanding to maintain a stable net asset value per share, subject to certain Board determinations and disclosures to investors. The SEC and other government agencies continue to review the regulation of money market funds and may implement additional regulatory changes in the future. The enactment of any new legislation or regulations impacting the money market fund industry could limit the Fund's investment flexibility and reduce its ability to generate returns.

Money Market Fund Risk. An investment in a money market fund is not a deposit of any bank and is not insured or guaranteed by the FDIC or any other government agency. Although a money market fund generally seeks to preserve the value of its shares at $1.00 per share, there can be no assurance that it will do so, and it is possible to lose money by investing in a money market fund. A major or unexpected change in interest rates or a decline in the credit quality of an issuer or entity providing credit support, an inactive trading market for money market instruments, or adverse market, economic, industry, political, regulatory, geopolitical, and other conditions could cause a money market fund's share price to fall below $1.00. It is possible that a money market fund will issue and redeem shares at $1.00 per share at times when the fair value of the money market fund's portfolio per share is more or less than $1.00. Rule 2a-7 as adopted by the SEC permits a money market fund to impose a liquidity fee upon the sale of fund shares under certain circumstances, however the U.S. Government Fund is a government money market fund that has not elected to be subject to the liquidity fee provision of Rule 2a-7. None of State Street Corporation, State Street, State Street Global Advisors, SSGA FM or their affiliates (collectively, the “State Street Entities”) guarantee the value of an investment in a money market fund at $1.00 per share. Investors should have no expectation of capital support to a money market fund from the State Street Entities.

Mortgage-Related and Other Asset-Backed Securities Risk. Investments in mortgage-related and other asset-backed securities are subject to the risk of significant credit downgrades, illiquidity, and defaults to a greater extent than many other types of fixed income investments. The liquidity of mortgage-related and asset-backed securities may change over time. Mortgage-related securities represent a participation in, or are secured by, mortgage loans. Other asset-backed securities are typically structured like mortgage-related securities, but instead of mortgage loans or interests in mortgage loans, the underlying assets may include, for example, items such as motor vehicle installment sales or installment loan contracts, leases on various types of real and personal property, and receivables from credit card agreements. During periods of falling interest rates, mortgage-related and other asset-backed securities, which typically provide the issuer with the right to prepay the security prior to maturity, may be prepaid, which may result in the Fund having to reinvest the proceeds in other investments at lower interest rates. During periods of rising interest rates, the average life of mortgage-related and other asset-backed securities may extend because of slower-than expected principal payments. This may lock in a below market interest rate, increase the security's duration and interest rate sensitivity, and reduce the value of the security. As a result, mortgage-related and other asset-backed securities may have less potential for capital appreciation during periods of declining interest rates than other debt securities of comparable maturities, although they may have a similar risk of decline in market values during periods of rising interest rates. Prepayment rates are difficult to predict and the potential impact of prepayments on the value of a mortgage-related or other asset-backed security depends on the terms of the instrument and can result in significant volatility. The price of a mortgage-related or other asset-backed security also depends on the credit quality and adequacy of the underlying assets or collateral. Mortgage-related or other asset-backed securities issued by non-governmental issuers (such as commercial banks, savings and loan institutions, private mortgage insurance companies, mortgage bankers and other secondary market issuers) will generally entail greater credit risk than obligations guaranteed by the U.S. government. Defaults on the underlying assets, if any, may impair the value of a mortgage-related or other asset-backed security. For some asset-backed securities in which the Fund invests, such as those backed by credit card receivables, the underlying cash flows may not be supported by a security interest in a related asset. Moreover, the values of mortgage-related and other asset-backed securities may be substantially dependent on the servicing of the underlying asset pools, and are therefore subject to risks associated with the negligence or malfeasance by their servicers and to the credit risk of their servicers. In certain situations, the mishandling of related documentation may also affect the rights of securities holders in and to the underlying collateral. There may be legal and practical limitations on the enforceability of any security interest granted with respect to underlying assets, or the value of the underlying assets, if any, may be insufficient if the issuer defaults.

Rapid Changes in Interest Rates. The values of instruments held by the Fund may be adversely affected by rapid changes in interest rates. Rapid changes in interest rates may cause significant requests to redeem Fund Shares, and possibly cause the Fund to sell portfolio securities at a loss to satisfy those requests. Significant losses could impair the Fund's ability to maintain a stable share price of $1.00.

Reinvestment Risk. Income from the Fund's portfolio may decline when the Fund invests the proceeds from investment income, sales of portfolio securities or matured, traded or called debt obligations. For instance, during periods of declining interest rates, an issuer of debt obligations may exercise an option to redeem securities prior to maturity, forcing the Fund to reinvest the proceeds in lower-yielding securities. A decline in income received by the Fund from its investments is likely to have a negative effect on the yield and total return of the Fund Shares.

Repurchase Agreement Risk. A repurchase agreement is an agreement to buy a security from a seller at one price and a simultaneous agreement to sell it back to the original seller at an agreed-upon price, typically representing the purchase price plus interest. Repurchase agreements may be viewed as loans made by the Fund which are collateralized by the securities subject to repurchase. The Fund's investment return on such transactions will depend on the counterparty's willingness and ability to perform its obligations under a repurchase agreement. If the Fund's counterparty should default on its obligations and the Fund is delayed or prevented from recovering the collateral, or if the value of the collateral is insufficient, the Fund may realize a loss.

Significant Exposure to U.S. Government Agencies or Instrumentalities Risk . To the extent the Fund focuses its investments in securities issued or guaranteed by U.S. government agencies or instrumentalities, any market movements, regulatory changes or changes in political or economic conditions that affect the U.S. government agencies or instrumentalities in which the Fund invests may have a significant impact on the Fund's performance. Events that would adversely affect the market prices of securities issued or guaranteed by one government agency or instrumentality may adversely affect the market price of securities issued or guaranteed by other government agencies or instrumentalities.

ernment will not be able to make principal or interest payments when they are due. In the worst case, unsustainable debt levels can cause a decline in the value of the dollar (which may lead to inflation), and can prevent the U.S. government from implementing effective countercyclical fiscal policy in economic downturns. On August 5, 2011, Standard & Poor's Ratings Services downgraded U.S. Treasury securities from AAA rating to AA+ rating. Standard & Poor's Ratings Services stated that its decision was prompted by its view on the rising public debt burden and its perception of greater policymaking uncertainty. Fitch also downgraded its rating of U.S. Treasury securities from AAA to AA+ in August 2023 citing increasing government debt and erosion in confidence regarding governance of fiscal matters as a result of repeated political standoffs related to debt limit approvals. A downgrade of the ratings of U.S. government debt obligations, which are often used as a benchmark for other borrowing arrangements, could result in higher interest rates for individual and corporate borrowers, cause disruptions in the international bond markets and have a substantial negative effect on the U.S. economy. Any additional downgrades of U.S. Treasury securities from ratings agencies may cause the value of the Fund's U.S. Treasury obligations to decline. In recent years, impasses in Congress regarding the federal budget have caused temporary Federal government shutdowns. While Congress has temporarily suspended the debt limit from time to time, the risks that the U.S. government will not adopt a long-term budget or deficit reduction plan, of one or more additional Federal government shutdowns or of future failures to not increase the Federal government's debt limit, may affect investor and consumer confidence and may adversely impact financial markets and the broader economy, perhaps suddenly and to a significant degree.

Variable and Floating Rate Securities Risk. Variable or floating rate securities are debt securities with variable or floating interest rates payments. Variable or floating rate securities bear rates of interest that are adjusted periodically according to formulae intended generally to reflect market rates of interest and allow the Fund to participate (determined in accordance with the terms of the securities) in increases in interest rates through upward adjustments of the coupon rates on the securities. However, during periods of increasing interest rates, changes in the coupon rates may lag behind the changes in market rates or may have limits on the maximum increases in coupon rates. Alternatively, during periods of declining interest rates, the coupon rates on such securities will typically readjust downward resulting in a lower yield. The Fund may also invest in variable or floating rate equity securities, whose dividend payments vary based on changes in market rates of interest or other factors.

Additional Information About Non-Principal Investment Strategies and Risks

The investments described below reflect the Fund's and the Portfolio's current practices. In addition to the principal risks described above, other risks are described in some of the descriptions of the investments below:

The Adviser and its affiliates serve as investment adviser to other clients and may make investment decisions that may be different from those that will be made by the Adviser on behalf of the Fund. For example, the Adviser may provide asset allocation advice to some clients that may include a recommendation to invest in or redeem from particular issuers while not providing that same recommendation to all clients invested in the same or similar issuers. The Adviser may (subject to applicable law) be simultaneously seeking to purchase (or sell) investments for the Fund and to sell (or purchase) the same investment for accounts, funds, or structured products for which it serves as asset manager, or for other clients or affiliates. The Adviser and its affiliates may invest for clients in various securities that are senior, pari passu or junior to, or have interests different from or adverse to, the securities that are owned by the Fund. The Adviser or its affiliates, in connection with its other business activities, may acquire material nonpublic confidential information that may restrict the Adviser from purchasing securities or selling securities for itself or its clients (including the Fund) or otherwise using such information for the benefit of its clients or itself.

Cybersecurity Risk. With the increased use of technologies such as the Internet and the dependence on computer systems to perform business and operational functions, funds (such as the Fund) and their service providers (including the Adviser) may be prone to operational and information security risks resulting from cyber-attacks and/or technological malfunctions. Furthermore, geopolitical tensions may have increased the scale and sophistication of deliberate cybersecurity attacks, particularly those from nation-states or from entities with nation-state backing. In general, cyber-attacks are deliberate, but unintentional events may have similar effects. Cyber-attacks include, among others, stealing or corrupting data maintained online or digitally, preventing legitimate users from accessing information or services on a website, releasing confidential information without authorization, and causing operational disruption. Successful cyber-attacks against, or security breakdowns of, the Fund, the Portfolio, the Adviser or a custodian, transfer agent, or other affiliated or third-party service provider may adversely affect the Fund or its shareholders. For instance, cyber-attacks or technical malfunctions may interfere with the processing of shareholder or other transactions, affect the Fund's ability to calculate its NAV, cause the release of private shareholder information or confidential Fund information, impede trading, cause reputational damage, and subject the Fund to regulatory fines, penalties or financial losses, reimbursement or other compensation costs, and additional compliance costs. Cyber-attacks or technical malfunctions may render records of Fund assets and transactions, shareholder ownership of Fund Shares, and other data integral to the functioning of the Fund inaccessible or inaccurate or incomplete. The Fund may also incur substantial costs for cybersecurity risk management in order to prevent cyber incidents in the future. The Fund and its shareholders could be negatively impacted as a result. While the Adviser has established business continuity plans and systems designed to minimize the risk of cyber-attacks through the use of technology, processes and controls, there are inherent limitations in such plans and systems, including the possibility that certain risks have not been identified, given the evolving nature of this threat. The use of artificial intelligence (“AI”) and machine learning could exacerbate these risks or result in cyber security incidents that implicate personal data. The Fund relies on third-party service providers for many of its day-to-day operations, and will be subject to the risk that the protections and protocols implemented by those service providers will be ineffective to protect the Fund from cyber-attack. The Adviser does not control the cybersecurity plans and systems put in place by third-party service providers, and such third-party service providers may have limited indemnification obligations to the Adviser or the Fund. Similar types of cybersecurity risks or technical malfunctions also are present for issuers of securities in which the Fund invests, which could result in material adverse consequences for such issuers, and may cause the Fund's investment in such securities to lose value.

Temporary Defensive Positions. In response to actual or perceived adverse market, economic, political, or other conditions, the Fund may (but will not necessarily), without notice, depart from its principal investment strategies by temporarily investing for defensive purposes. While investing defensively, the Fund may maintain a substantial portion of its assets in cash, on which the Fund may earn little if any income. If the Fund invests for defensive purposes, it may not achieve its investment objective. In addition, the defensive strategy may not work as intended.

Portfolio Holdings Disclosure

The Fund's portfolio holdings disclosure policy is described in the Statement of Additional Information (“SAI”).

Management and Organization

The Fund can withdraw its investment in the Portfolio if, at any time, the Fund's Board of Trustees (the “Board”) determines that it would be in the best interests of the Fund's shareholders, or if the investment objectives of the Portfolio changed so that they were inconsistent with the objectives of the Fund. If the Fund withdraws its investment from the Portfolio, the Fund may invest all of its assets in another mutual fund that has the same investment objective as the Fund, the Adviser may directly manage the Fund's assets, or the Board may take such other action it deems appropriate and in the best interests of shareholders of the Fund, which may include liquidation of the Fund.

Investment Adviser

The Fund has entered into an investment advisory agreement with the Adviser pursuant to which the Adviser will manage the Fund's assets directly, for compensation paid at an annual rate of 0.05% of the Fund's average daily net assets, in the event that the Fund were to cease investing substantially all of its assets in its Portfolio or another investment company with essentially the same investment objectives and policies as the Fund. The Adviser does not receive any management fees from the Fund under that agreement so long as the Fund continues to invest substantially all of its assets in the Portfolio or in another investment company with essentially the same investment objectives and policies as the Fund. The Adviser places all orders for purchases and sales of the Portfolio's investments. For the year ended December 31, 2024, the effective management fee paid, reflecting certain fee waivers and expense reimbursements of the Adviser, was 0.05% for the Portfolio.

Total Annual Fund Operating Expense Waiver. SSGA FM, as the investment adviser to the Fund is contractually obligated, through April 30, 2026 (i) to waive up to the full amount of the advisory fee payable by the Fund, and/or (ii) to reimburse the Fund for expenses to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, extraordinary expenses, acquired fund fees, any class-specific expenses, such as distribution, shareholder servicing, sub-transfer agency and administration fees) exceed 0.07% of average daily net assets on an annual basis (the “Total Annual Fund Operating Expense Waiver”). The Total Annual Fund Operating Expense Waiver may not be terminated prior to April 30, 2026 with respect to the Fund except with approval of the Board.

In addition to any contractual expense limitation for the Fund which is described above, each of the Adviser and State Street Global Advisors Funds Distributors, LLC (each a “Service Provider”) also may voluntarily reduce all or a portion of its fees and/or reimburse expenses for the Fund or a share class to the extent necessary to maintain a certain minimum net yield, which may vary from time to time and from share class to share class within the Fund, in SSGA FM's sole discretion (any such waiver or reimbursement of expenses being referred to herein as a “Voluntary Reduction”). Under an

agreement with the Service Providers relating to the Voluntary Reduction, the Fund and the Portfolio have agreed to reimburse the Service Providers for the full dollar amount of any Voluntary Reduction beginning on May 1, 2020, subject to certain limitations. Each Service Provider may, in its sole discretion, irrevocably waive receipt of any or all reimbursement amounts due from the Fund.

A reimbursement to the Service Provider would increase fund expenses and may negatively impact the Fund's yield during such period. There is no guarantee that the Voluntary Reduction will be in effect at any given time or that the Fund will be able to avoid a negative yield. The Fund has agreed, subject to certain limitations, to reimburse the applicable Service Provider for the full dollar amount of any Voluntary Reduction incurred after May 1, 2020. The Fund is not obligated to reimburse a Service Provider: (1) more than three years after the end of the fiscal year of the Fund in which the Service Provider provided a Voluntary Reduction; (2) in respect of any business day for which the net annualized one-day yield of the Fund or applicable Class is less than 0.00%; (3) to the extent that the amount of the reimbursement to all Service Providers on any day exceeds fifty percent of the yield (net of all expenses, exclusive of the reimbursement) of the Fund or the applicable class on that day; (4) to the extent that the amount of such reimbursement would cause the Fund's or applicable class's net yield to fall below the Fund's or applicable class's minimum yield; (5) in respect of any such fee waivers and/or expense reimbursements that are necessary to maintain the Fund's Contractual Total Expense Limit (as defined in the Reimbursement Agreement) which is effective at the time of such fee waivers and/or expense reimbursements; or (6) in any manner that would result in a class bearing the cost of a reimbursement to the Service Provider for any class-specific expense (including, without limitation, fees payable in accordance with a plan authorized pursuant to Rule 12b‑1 under the 1940 Act, or Shareholder Servicing Agreement or similar arrangement) that was waived or reimbursed to the Fund with respect to a different Class. Any such future reimbursement of an applicable Service Provider may result in the total annual operating expenses with respect to a share class of the Fund exceeding the amount of the expense cap under the contractual expense limitation agreement because the expense is not covered by the agreement.

A discussion regarding the Board's consideration of the Fund's Investment Advisory Agreement is provided in the Fund's Form N-CSR filing with the SEC for the period ended June 30, 2024.

The Administrator, Sub-Administrator and Custodian

The Adviser serves as administrator of the Fund. The amount of the fee paid to the Adviser for administrative services may vary by share class. The Fund currently pays the Adviser an administrative fee at the annual rate of 0.01% in respect of the class of shares in this Prospectus. State Street Bank and Trust Company (“State Street”), a subsidiary of State Street Corporation, serves as the sub-administrator for the Fund for a fee that is paid by the Adviser. State Street also serves as custodian of the Fund for a separate fee that is paid by the Fund. SSGA FM serves as administrator of the Portfolio and State Street serves as sub-administrator and custodian of the Portfolio.

The Transfer Agent and Dividend Disbursing Agent

SS&C GIDS, Inc. is the Fund's transfer agent and dividend disbursing agent (the “Transfer Agent”).

The Distributor

State Street Global Advisors Funds Distributors, LLC serves as the Fund's distributor (“SSGA FD”) pursuant to the Distribution Agreement between SSGA FD and the Trust.

The Shareholder Servicing Agent

SSGA FD serves as the Fund's shareholder servicing agent pursuant to the Shareholder Servicing Agreement between SSGA FD and the Trust and receives fees from the Fund for the provision and procurement of applicable services. Please see the SAI for more information on SSGA FD's role as the Fund's shareholder servicing agent.

Additional Information

Shareholder Information

Determination of Net Asset Value

The Fund determines its NAV per share once each Business Day (as defined below), typically at 5:00 p.m. ET (the time when the Fund determines its NAV per share is referred to herein as the “Valuation Time”). The Fund reserves the right to advance the time for accepting purchase or redemption orders and/or the Valuation Time on any day when the NYSE, bond markets (as recommended by The Securities Industry and Financial Markets Association (“SIFMA”)) or any Federal Reserve bank close early, trading on the NYSE is restricted, an emergency arises or as otherwise permitted by the SEC. The Fund reserves the right to continue to accept orders to purchase or redeem shares following the close of the NYSE on any day on which the NYSE closes early, provided that either the Federal Reserve or the bond markets remain open. In addition, the Board may, for any Business Day, decide to change the time as of which the Fund's NAV is calculated in response to new developments such as altered trading hours, or as otherwise permitted by the SEC.

The Federal Reserve is closed on certain holidays on which the NYSE is open. These holidays are Columbus Day and Veterans Day. On these holidays, you will not be able to purchase shares by wiring Federal Funds because Federal Funds wiring does not occur on days when the Federal Reserve is closed. In the event that the Fund invokes the right to accept orders to purchase or redeem shares on any day that is not a Business Day, the Fund will post advance notice of these events at: www.ssga.com.

The Fund seeks to maintain a $1.00 per share NAV and, accordingly, uses the amortized cost valuation method, in compliance with the risk limiting conditions of Rule 2a-7 under the Investment Company Act of 1940, as amended (the “1940 Act”), to value its portfolio instruments. The amortized cost valuation method initially prices an instrument at its cost and thereafter assumes a constant amortization to maturity of any discount or premium, regardless of the impact of fluctuating interest rates on the market value of the instrument.

If you hold shares of the Fund through a broker-dealer or other financial intermediary, your intermediary may offer additional services and account features that are not described in this Prospectus. Please contact your intermediary directly for an explanation of these services.

Investing in State Street Institutional Investment Trust Shares

Purchasing Shares

The Fund offers one class of shares through this Prospectus: Class G shares, available to you subject to the eligibility requirements set forth below. All classes of the Fund share the same investment objective and investments, but the different share classes have different expense structures and eligibility requirements. You should choose the class with the expense structure that best meets your needs for which you are eligible. In choosing a share class, you should consider the amount you plan to invest. Your investment professional can help you choose the share class that best suits your investment needs.

The chart below summarizes the features of the share class. This chart is only a general summary, and you should read the description of the Fund's expenses in the Fund Summary in this Prospectus.

Any applicable minimum purchase amount may be waived for specific investors or types of investors, including, without limitation, retirement plans, employees of State Street Corporation and its affiliates and their family. In the case of shareholders purchasing shares through a Financial Intermediary, the minimum purchase amount may be applied at the level of the Financial Intermediary.

Minimum Initial Investment	$1,000,000,000
Maximum Investment	None.
Initial Sales Charge	None. Entire purchase price is invested in shares of the Fund.
Deferred (CDSC) Sales Charge	None.
Distribution and/or Service (12b-1) Fees	None.

Investors pay no sales load to invest in Class G shares of the Fund. The price for Fund Shares is the NAV per share. Purchase requests received by the Fund in good order (a purchase request is in good order if it meets the requirements implemented from time to time by the Transfer Agent or authorized agent of the Fund, and for new accounts includes submission of a completed and signed application and all documentation necessary to open an account) on a Business Day will, if payment is received by FedWire, be priced at the NAV next determined after the order is accepted by the Fund. Payments received by FedWire prior to the last Valuation Times will earn dividend accrual for that purchase. All purchases that are made by check will be priced with the last valuation price and begin earning dividends the following Business Day after the day the order is accepted. (If you purchase shares by check, your order will not be in good form until the Transfer Agent receives federal funds for the check.) All purchase orders are subject to acceptance by the Fund. The Fund intends to be as fully invested as is practicable; therefore, investments must be made in Federal Funds (i.e., monies credited to the account of the Fund's custodian bank by a Federal Reserve Bank).

The minimum initial investment in Class G shares of the Fund is $1 billion although the Adviser may waive the minimum in its discretion. Holdings of related customer accounts may be aggregated for purposes of determining the minimum investment amount. “Related customer accounts” may include, but are not limited to, accounts held by the same investment or retirement plan, financial institution, broker, dealer or intermediary. The Fund and the Adviser reserve the right to increase or decrease the minimum amount required to open or maintain an account. There is no minimum subsequent investment, except in relation to maintaining certain minimum account balances (See “Redeeming Shares” below). The Fund requires prior notification of subsequent investments in excess of $50 million. The Fund reserves the right to cease accepting investments at any time or to reject any investment order. In addition, the Fund may limit the amount of a purchase order received after 3:00 p.m. ET.

How to Purchase Shares

By Mail:

An initial investment in the Fund must be preceded or accompanied by a completed, signed Institutional Account

Application Form, sent to:

State Street Funds

P.O. Box 219737

Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds

801 Pennsylvania Avenue, Suite 219737

Kansas City, MO 64105-1307

By Telephone/Fax:

An initial investment in the Fund must be preceded or accompanied by a completed, signed Institutional Account

Application Form, faxed to (816) 218-0400. Call the Fund at (866) 392-0869 between the hours of 8:00 a.m. ET

and 6:00 p.m. ET to:

➢ confirm receipt of the faxed Institutional Account Application Form (initial purchases only),

➢ request your new account number (initial purchases only),

➢ confirm the amount being wired and wiring bank, and

➢ receive a confirmation number for your purchase order (your trade is not effective until you have received a

confirmation number from the Fund).

For your initial investment, send the original, signed Institutional Account Application Form to the address above.

Wire Instructions:

Instruct your bank to transfer money by Federal Funds wire to:

State Street Bank and Trust Company

1 Iron Street

Boston, MA 02210

ABA# 011000028

DDA# 9904-631-0

State Street Institutional Investment Trust

Fund Name

Class Name

Account Number

Account Registration

On Columbus Day and Veterans Day, you will not be able to purchase shares by wiring Federal Funds because the

Federal Funds wiring does not occur on those days. Payment for Fund Shares must be in Federal Funds (or

converted to Federal Funds by the Transfer Agent) by the close of the Federal Reserve.

The Fund and the Fund's agents are not responsible for transfer errors by the sending or receiving bank and will

not be liable for any loss incurred due to a wire transfer not having been received.

Redeeming Shares

redemption order is placed after 5:00 p.m. ET, the Fund typically expects to pay out redemption proceeds on the next Business Day (and dividends will accrue up to, but not including, the day that redemption proceeds are sent), but no later than the following Business Day. The Fund may postpone and/or suspend redemption and payment beyond the foregoing time periods only as follows:

For any period during which there is a non-routine closure of the Fedwire or applicable Federal Reserve Banks;

For any period (1) during which the NYSE is closed other than customary week-end and holiday closings or (2) during which trading on the NYSE is restricted;

For any period during which the SEC has, by rule or regulation, deemed that (1) trading shall be restricted or (2) an emergency exists;

For any period that the SEC, may by order permit for your protection; or

The Fund may pay all or a portion of your redemption proceeds by giving you securities (for example, if the Fund reasonably believes that a cash redemption may have a substantial impact on the Fund and its remaining shareholders). A redemption is generally a taxable event for shareholders, regardless of whether the redemption is satisfied in cash or in kind. You may pay transaction costs and/or taxes to dispose of the securities, and you may receive less for them than the price at which they were valued for purposes of the redemption. In addition, you will be subject to the market risks associated with such securities until such time as you choose to dispose of the security.

During periods of deteriorating or stressed market conditions or during extraordinary or emergency circumstances, the Fund may be more likely to pay redemption proceeds with cash obtained through short-term borrowing arrangements (if available) or by giving you securities.

A request for a partial redemption by an investor whose account balance is below a minimum amount or a request for partial redemption by an investor that would bring the account below a minimum amount may be treated as a request for a complete redemption of the account. These minimums may be different for investments made through certain financial intermediaries as determined by their policies and may be waived in the Adviser's discretion. The Fund reserves the right to modify minimum account requirements at any time with or without prior notice. The Fund also reserves the right to involuntarily redeem an investor's account if the investor's account balance falls below the applicable minimum amount due to transaction activity.

How to Redeem Shares


By Mail:	Send a signed letter to: State Street Institutional Investment Trust Funds P.O. Box 219737 Kansas City, MO 64121-9737
	The letter should include information necessary to process your request as described below. The Fund may require a medallion guarantee in certain circumstances. See “Medallion Guarantees” below.
By Overnight:	State Street Institutional Investment Trust Funds 801 Pennsylvania Avenue, Suite 219737 Kansas City, MO 64105-1307
By Telephone:	Please call (866) 392-0869 between the hours of 8:00 a.m. and 6:00 p.m. ET.
The Fund will need the following information to process your redemption request:
➢ name(s) of account owners; ➢ account number(s); ➢ the name of the Fund; ➢ your daytime telephone number; and ➢ the dollar amount or number of shares being redeemed.

On any day that the Fund calculates its NAV earlier than normal, the Fund reserves the right to adjust the times noted above for purchasing and redeeming shares.

Medallion Guarantees. Certain redemption requests must include a medallion guarantee for each registered account owner if any of the following apply:

•

Your account address has changed within the last 10 Business Days.

•

Redemption proceeds are being transferred to an account with a different registration.

•

A wire is being sent to a financial institution other than the one that has been established on your Fund account.

•

Other unusual situations as determined by the Transfer Agent.

The Fund reserves the right to waive medallion guarantee requirements, require a medallion guarantee under other circumstances or reject or delay redemption if the medallion guarantee is not in good form. Medallion guarantees may be provided by an eligible financial institution such as a commercial bank, a FINRA member firm such as a stock broker, a savings association or a national securities exchange. A notary public cannot provide a medallion guarantee. The Fund reserves the right to reject a medallion guarantee if it is not provided by a STAMP Medallion guarantor.

About Telephone Transactions. Telephone transactions are convenient but are not free from risk. Neither the Fund nor the Fund's agents will be responsible for any losses resulting from unauthorized telephone transactions if reasonable security procedures are followed. In addition, you are responsible for: (i) verifying the accuracy of all data and information transmitted by telephone, (ii) verifying the accuracy of your account statements immediately upon receipt, and (iii) promptly notifying the Fund of any errors or inaccuracies, including, without limitation, any errors or inaccuracies relating to shareholder data or information transmitted by telephone. During periods of heavy market activity or other times, it may be difficult to reach the Fund by telephone. If you are unable to reach us by telephone, consider sending written instructions.

The Fund may terminate the receipt of redemption orders by telephone at any time, in which case you may redeem shares by other means.

If you choose to purchase or redeem shares by sending instructions by regular mail, they will not be deemed received in good order until they are released by the post office and redelivered to the Transfer Agent's physical location at 801 Pennsylvania Avenue, Suite 219737 in Kansas City, MO 64105-1307. There will be a time lag, which may be one or more days, between regular mail receipt at the post office box and redelivery to such physical location in Kansas City, and the Fund's NAV may change over those days. You might consider using express rather than regular mail if you believe the time of receipt of your transaction request to be sensitive.

Excessive Trading

Because the Fund is a money market fund, the Fund's Board has not adopted policies and procedures with respect to frequent purchases and redemptions of Fund shares by Fund shareholders. Nonetheless, the Fund may take any reasonable action that it deems necessary or appropriate to prevent excessive trading in Fund shares without providing prior notification to the account holder. Such action may include rejecting any purchase, in whole or part, including, without limitation, by a person whose trading activity in Fund shares may be deemed harmful to the Fund. While the Fund attempts to discourage such excessive trading, there can be no guarantee that it will be able to identify investors who are engaging in excessive trading or limit their trading practices. Additionally, frequent trades of small amounts may not be detected. The Fund recognizes that it may not always be able to detect or prevent excessive trading or other activity that may disadvantage the Fund or its shareholders.

Delivery of Documents to Accounts Sharing an Address

To reduce expenses, we may mail only one copy of the Fund's Prospectus and the annual and semi-annual report to those addresses shared by two or more accounts. If you wish to receive individual copies of these documents, please call us at (866) 392-0869, or contact your financial institution. We will begin sending you individual copies thirty (30) days after receiving your request.

Unclaimed Property

Many states have unclaimed property rules that provide for transfer to the state (also known as “escheatment”) of unclaimed property under various circumstances. These circumstances include inactivity (e.g., no owner-initiated contact for a certain period), returned mail (e.g., when mail sent to a shareholder is returned by the post office as undeliverable), or a combination of both inactivity and returned mail. If a State Street Fund identifies property as unclaimed, it will attempt to contact the shareholder, but if that attempt is unsuccessful, the account may be considered abandoned and escheated to the state after the passage of a certain period of time (as required by applicable state law).

If you are a resident of the state of Texas, you may designate a representative to receive escheatment notifications by completing and submitting a designation form, which you can find on the website of the Texas Comptroller. Designating such a representative may be beneficial, since Texas law provides that the escheatment period will cease if the representative, after receiving an escheatment notification regarding your account, communicates knowledge of your location and confirms that you have not abandoned your account. You can mail a completed designation form to the Fund (if you hold shares directly with the Fund) or to your financial intermediary (if you do not hold shares directly with the Fund).

Dividends, Distributions and Tax Considerations

elected to receive distributions by check, and the postal or other delivery service is unable to deliver the checks because of an incorrect mailing address, or if a distribution check remains uncashed for six months, the uncashed distribution and all future distributions will be reinvested at the then-current NAV of the Fund.

The Fund has elected to be treated as a regulated investment company and intends each year to qualify and to be eligible to be treated as such. A regulated investment company generally is not subject to tax at the corporate level on income and gains that are timely distributed to shareholders. In order to qualify and be eligible for treatment as a regulated investment company, the Fund must, among other things, satisfy diversification, 90% gross income and distribution requirements. The Fund's failure to qualify as a regulated investment company would result in corporate level taxation, and consequently, a reduction in income available for distribution to shareholders.

The Fund invests substantially all of its investable assets in a Portfolio that is treated as a partnership for U.S. federal income tax purposes. Therefore, the nature and character of the Fund's income, gains, losses and deductions generally will be determined at the Portfolio level, and the Fund will be allocated its share of the Portfolio's income, gains, losses and deductions. As applicable, references in this discussion to income, gains and losses of the Fund will be to income, gains and losses recognized and deductions accruing at the Portfolio level and allocated to or otherwise taken into account by the Fund, and references to assets of the Fund will be to the Fund's allocable share of the assets of the Portfolio.

If the NAV of Fund Shares were to vary from $1.0000 per share, shareholders generally would realize a gain or loss upon the redemption or other taxable disposition of such Fund Shares. Any such gains generally would be taxable to you as either short-term or long-term capital gain, depending upon how long you have held such Fund Shares. The Internal Revenue Service (the “IRS”) has issued final regulations and published guidance that permit a simplified method of accounting for gains and losses realized upon the disposition of money market fund shares. Shareholders should see the SAI for further information.

An additional 3.8% Medicare contribution tax is imposed on the “net investment income” of individuals, estates and trusts to the extent their income exceeds certain threshold amounts. Net investment income generally includes for this purpose dividends paid by the Fund and net gains recognized on the redemption (or other taxable disposition) of Fund Shares.

The U.S. Treasury and IRS generally require the Fund to obtain information sufficient to identify the status of each shareholder under sections 1471-1474 of the Code, and the U.S. Treasury and IRS guidance issued thereunder (collectively, “FATCA”) or under an applicable intergovernmental agreement between the United States and a foreign government. Please see the SAI for more information on FATCA reporting requirements.

Financial Intermediary Arrangements

Payments to Financial Intermediaries

The Financial Intermediary is often compensated by SSGA FD or its affiliates for the services it performs and in such cases is typically paid continually over time, during the period when the Financial Intermediary's clients hold investments in the Fund. The amount of continuing compensation paid by SSGA FD or its affiliates to different Financial Intermediaries for distribution and/or shareholder services varies. Any compensation is typically a percentage of the value of the Financial Intermediary's clients' investments in the Fund or a per account fee. The variation in compensation may, but will not necessarily, reflect enhanced or additional services provided by the Financial Intermediary.

If you invest through a Financial Intermediary and meet the eligibility criteria for more than one share class, you should discuss with your Financial Intermediary which share class is appropriate for you. Your financial adviser and the Financial Intermediary employing him or her may have an incentive to recommend one share class over another, when you are eligible to invest in more than one share class. Please speak with your financial adviser to learn more about the total amounts paid to your financial adviser and his or her firm by the Fund or its affiliates with respect to the different share classes offered by the Fund.

SSGA FD and its affiliates (including SSGA FM), at their own expense and out of their own assets, may also provide other compensation to Financial Intermediaries in connection with sales of the Fund's shares or the servicing of shareholders or shareholder accounts. Such compensation may include, but is not limited to, financial assistance to Financial Intermediaries in connection with conferences, sales, or training programs for their employees; seminars for the public; advertising or sales campaigns; or other Financial Intermediary-sponsored special events. In some instances, this compensation may be made available only to certain Financial Intermediaries whose representatives have sold or are expected to sell significant amounts of shares. Dealers may not use sales of the Fund's shares to qualify for this compensation to the extent prohibited by the laws or rules of any state or any self-regulatory agency, such as FINRA.

Financial Highlights

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL U.S. GOVERNMENT MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class G (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Income (loss) from investment operations:
Net investment income (loss)	0.0515	0.0498	0.0162	0.0001	0.0043
Net realized gain (loss)	(0.0000 )(b)	0.0000 (b)	0.0000 (b)	—	0.0000 (b)
Total from investment operations	0.0515	0.0498	0.0162	0.0001	0.0043
Distributions to shareholders from:
Net investment income	(0.0515 )	(0.0498 )	(0.0162 )	(0.0001 )	(0.0043 )
Net asset value, end of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Total return (c)	5.27 %	5.10 %	1.63 %	0.03 %	0.43 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$5,963,995	$4,765,804	$4,699,611	$7,180,149	$6,025,209
Ratios to Average Net Assets:
Total expenses	0.07 %	0.07 %	0.08 %	0.08 %	0.08 %
Net expenses	0.07 %	0.07 %	0.07 %	0.05 %	0.08 %
Net investment income (loss)	5.11 %	4.98 %	1.47 %	0.03 %	0.37 %

(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.

Contacting the State Street Funds

Online:	www.ssga.com	24 hours a day, 7 days a week
Phone:	(877) 521-4083	Monday – Friday 8:00 am – 6:00 pm EST

Written requests should be sent to:

Regular mail	Overnight/Registered, Express, Certified Mail
State Street Funds P.O. Box 219737 Kansas City, MO 64121-9737	State Street Funds 801 Pennsylvania Avenue, Suite 219737 Kansas City, MO 64105-1307

For more information about the Fund:

The Fund's SAI includes additional information about the Fund and is incorporated by reference into this document. Additional information about the Fund's investments is available in the Fund's most recent annual and semi-annual reports to shareholders and in the Fund's Form N-CSR filing. In the Fund's Form N-CSR, you will find the Fund's annual and semi-annual financial statements. The Fund's SAI is available, without charge, upon request. The Fund's annual and semi-annual reports are available, without charge, upon request. Shareholders in the Fund may make inquiries to the Fund to receive such information by calling (877) 521-4083 or the customer service center at the telephone number shown in the accompanying contract prospectus, if applicable. The Fund's Prospectus, SAI, annual and semi-annual reports to shareholders and other information such as the Fund's financial statements are available, free of charge, on the Fund's website at www.ssga.com.

SSGA Funds Management, Inc

ONE IRON STREET

BOSTON, MASSACHUSETTS 02210

SSITCLGSTATPROThe State Street Institutional Investment Trust's Investment Company Act File Number is 811-09819.

Prospectus

April 30, 2025

State Street Institutional
Investment Trust

State Street Hedged International Developed Equity Index Fund

Class K (SSHQX)

State Street International Developed Equity Index Fund

Class K (SSIWX)

The U.S. Securities and Exchange Commission has not approved or disapproved these securities or passed upon the adequacy of this Prospectus. Any representation to the contrary is a criminal offense.

An investment in any of the Funds offered by this Prospectus is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

TABLE OF CONTENTS

Fund Summaries	1
State Street Hedged International Developed Equity Index Fund	1
State Street International Developed Equity Index Fund	10
Additional Information About Investment Objectives, Principal Strategies and Risks	18
Additional Information About Non-Principal Investment Strategies and Risks	29
Portfolio Holdings Disclosure	31
Management and Organization	32
Shareholder Information	34
Dividends, Distributions and Tax Considerations	42
Financial Intermediary Arrangements	44
Financial Highlights	46
Index/Trademark Licenses/Disclaimers	48

State Street Hedged International Developed Equity Index Fund

Investment Objective

The State Street Hedged International Developed Equity Index Fund (the “Hedged International Developed Equity Index Fund” or sometimes referred to in context as the “Fund”) seeks to provide investment results that, before fees and expenses, correspond generally to the total return performance of a broad-based developed market (ex-U.S. and Canada) large and mid capitalization equity index, hedged to the U.S. dollar, over the long term.

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Management Fee1	0.14%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%
Other Expenses	0.21%
Total Annual Fund Operating Expenses	0.35%
Less Fee Waivers and/or Expense Reimbursements2	(0.15%)
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	0.20%

The amount the Fund pays under its Investment Advisory Agreement is reduced by the amount of the advisory fee it bears indirectly through its investment in the State Street International Developed Equity Index Portfolio (the “Portfolio”). For the services provided under its Investment Advisory Agreement, the Portfolio pays SSGA Funds Management, Inc. (the “Adviser” or “SSGA FM”) a management fee at an annual rate of 0.11% of the Portfolio's average daily net assets. This arrangement may not be terminated except with the approval of the Fund's Board of Trustees.

The Adviser is contractually obligated until April 30, 2026 (i) to waive up to the full amount of the advisory fee payable by the Fund and/or (ii) to reimburse the Fund to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, extraordinary expenses, acquired fund fees other than the fees of the Portfolio, any class-specific expenses, such as distribution, shareholder servicing, sub-transfer agency and administration fees) exceed 0.15% of average daily net assets on an annual basis. This waiver and/or reimbursement may not be terminated prior to April 30, 2026 except with approval of the Fund's Board of Trustees.

Example:

1 year	3 years	5 years	10 years
$20	$97	$181	$428

Portfolio Turnover:

Principal Investment Strategies

The Fund is an “index” fund that seeks to track, before fees and expenses, the total return of the MSCI EAFE (Europe, Australasia, Far East) 100% Hedged to USD Index (the “Index”) over the long term. As an “index” fund, the Fund is not managed according to traditional methods of “active” investment management, which involve the buying and selling of securities based upon economic, financial and market analysis and investment judgment. The return of the Index is affected by the performance of Index constituents and the hedging strategy. In general, the Index would have higher returns than an equivalent unhedged index when the component currencies are weakening relative to the U.S. dollar. Conversely, the Index generally would have lower returns than an equivalent unhedged index when the component currencies are rising relative to the U.S. dollar.

In seeking to track the performance of the Index, the Fund expects to employ a sampling strategy, which means that the Fund will not typically purchase all of the securities represented in the Index. Instead, the Fund may purchase a subset of the securities in the Index or other investments in an effort to create a portfolio of securities with generally the same risk and return characteristics of the Index. The number of holdings in the Fund will be based on a number of factors, including the asset size of the Fund. Based on its analysis of these factors, SSGA Funds Management, Inc. (“SSGA FM” or the “Adviser”), the investment adviser to the Fund, may, instead, invest the Fund's assets in substantially all of the securities represented in the Index in approximately the same proportions as the Index.

Under normal circumstances, the Fund invests substantially all, but as a matter of policy no less than 80%, of its net assets (plus borrowings, if any) in securities, or American Depositary Receipts (“ADRs”) or Global Depositary Receipts (“GDRs”) based on securities, comprising the Index, or in other funds, including funds sponsored by the Adviser or its affiliates, in currency hedging instruments (and related collateral, if any), or in other investments, that the Adviser expects to provide a return highly correlated to the Index or a portion of the Index. The notional value of the Fund's investments in derivatives or other synthetic instruments that provide exposure comparable, in the judgment of the Adviser, to the foregoing types of investments may be counted toward satisfaction of this 80% policy. The Fund will provide shareholders with at least sixty (60) days' notice prior to any change in its policy to invest at least 80% of its assets as described in the foregoing. The Fund may invest in equity securities that are not included in the Index (including common stock, preferred stock, depositary receipts and shares of other investment companies), currency transactions, cash and cash equivalents or money market instruments, such as repurchase agreements and money market funds (including money market funds advised by the Adviser). The Fund may use derivatives, including futures contracts and options, swaps, and contracts for differences, to obtain investment exposures that the Adviser expects to correlate closely with the Index or a portion of the Index.

Under normal circumstances, the Fund will invest at least 80% of its net assets (plus borrowings, if any) in equity securities of issuers in developed economies or securities markets. For this purpose, countries with “developed economies or securities markets” refers to countries that are included in the Index, or a global developed markets equity index, and countries with similar characteristics (countries that have sustained economic development, sufficient liquidity for listed companies and accessible markets). The notional value of the Fund's investments in derivatives or other synthetic instruments that provide exposures comparable, in the judgment of the Adviser, to investments in equity securities of issuers in developing economies or securities markets may be counted toward satisfaction of this 80% policy. The Fund will provide shareholders with at least 60 days' notice prior to any change in this 80% investment policy.

The Fund currently intends to gain all of its investment exposure to, and track the performance of, the Index constituents by investing in the State Street International Developed Equity Index Portfolio and employ its currency hedging strategy by directly entering into currency hedging transactions. The Adviser also serves as investment adviser to the Portfolio. When the Fund invests in the Portfolio, the Fund participates in the investment returns achieved by the Portfolio. Descriptions in this section of the investment activities of the “Fund” with respect to the Index constituents also generally describe the expected investment activities of the Portfolio.

The Fund intends to hedge its non-U.S. currency exposure to the U.S. dollar, in a manner intended to replicate the currency hedge reflected in the Index. For this purpose, the Fund may enter into foreign currency forward contracts, forward currency futures and options, and currency swaps. The Index hedges each foreign currency in the Index back to the U.S. dollar by selling foreign currency forwards at the one-month forward rate. The size and exchange rate of each currency hedge is reset by the Index one time per month. Even if the Fund's hedging strategy works as intended, changes in currency exchange rates will still affect Fund returns (see “Currency Hedging Risk” below). The Fund's performance, like that of the Index, will depend on both the performance of the stocks comprising the Fund and the performance of the U.S. dollar relative to foreign currencies.

The Index is designed to capture the performance that can be achieved by hedging the currency exposures of its parent index, the MSCI EAFE Index, to the U.S. dollar. The MSCI EAFE Index is a free float-adjusted market capitalization index that is designed to capture large and mid-cap securities in developed market countries, excluding the United States and Canada. As of February 28, 2025, the MSCI EAFE Index comprised 722 securities covering companies across 21 countries and represented 85% of the free float-adjusted market capitalization of those countries. As of February 28, 2025, a significant portion of the MSCI EAFE Index comprised companies in the financials sector, and companies located in Japan and the United Kingdom and a significant portion of the Index constituents are denominated in the Yen, the Pound Sterling and the Euro, although this may change from time to time. As of February 28, 2025, the full market capitalization of the companies included in the MSCI EAFE Index ranged from $1.94 billion to $289.46 billion. As of February 28, 2025, countries covered in the MSCI EAFE Index included Australia, Austria, Belgium, Denmark, Finland, France, Germany, Hong Kong, Ireland, Israel, Italy, Japan, the Netherlands, New Zealand, Norway, Portugal, Singapore, Spain, Sweden, Switzerland and the United Kingdom, although this may change from time to time.

The Index is sponsored by MSCI, Inc. (the “Index Provider”) which is not affiliated with the Fund or the Adviser. The Index Provider determines the composition of the Index, relative weightings of the securities in the Index and publishes information regarding the market value of the Index.

Principal Risks

Europe: Developed and emerging market countries in Europe will be significantly affected by the fiscal and monetary controls of the Economic and Monetary Union of the European Union (“EU”). Changes in regulations on trade, decreasing imports or exports, changes in the exchange rate of the euro and recessions among European countries may have a significant adverse effect on the economies of other European countries. In addition, one or more countries may abandon the euro and/or withdraw from the EU On January 31, 2020, the United Kingdom (“UK”) formally withdrew from the EU (commonly known as “Brexit”). An agreement between the UK and the EU governing their future trade relationship became effective January 1, 2021, but that agreement does not include an agreement on financial services, and it is unlikely that such agreement will be concluded. Moreover, the UK government has started a program of financial services law reform with the ultimate aim of repealing many EU financial services laws that were assimilated into UK law from January 1, 2021, and replacing them with legislation or rules made by the UK government or financial services regulators. Accordingly, uncertainty remains in certain areas as to the future relationship between the UK and the EU. Brexit has already had a significant impact on the UK, Europe, and global economies, and could continue to result in volatility and illiquidity, legal, political, economic and regulatory uncertainties and lower economic growth for these economies that could in turn have an adverse effect on the value of the Fund's investments. Any further exits from the EU, or the possibility of such exits, or the abandonment of the euro, may cause additional market disruption globally and introduce new legal and regulatory uncertainties. In addition, a number of countries in Europe have suffered terrorist attacks and additional attacks may occur in the future. Such attacks may cause uncertainty in financial markets and may adversely affect the performance of the issuers to which the Fund has exposure.

Currency Hedging Risk: When a derivative is used as a hedge against a position that the Fund holds, any gain generated by the derivative generally should be substantially offset by losses on the hedged investment, and vice versa. While hedging can reduce or eliminate losses, it can also reduce or eliminate gains. Hedges are sometimes subject to imperfect matching between a derivative and its reference asset. For example, because the Fund's currency hedge is reset on a monthly basis, based on the size of the Fund's exposure to a currency at a certain point in time, the size of each currency hedge could be greater or less than the Fund's total exposure in that currency intra-month and currency risk may develop or increase between resets. Furthermore, while the Fund is designed to hedge against currency fluctuations, it is possible that a degree of currency exposure may remain even at the time a hedging transaction is implemented. As a result, changes in currency exchange rates may affect Fund returns even when the hedge works as intended. The effectiveness of the Fund's currency hedging strategy will also generally be affected by both the volatility of the securities included in the Index, and the volatility of the U.S. dollar relative to the currencies to be hedged. Increased volatility may reduce the effectiveness of the Fund's currency hedging strategy and may impact the costs associated with hedging transactions. The effectiveness of the Fund's currency hedging strategy and the costs associated with hedging transactions may also in general be affected by interest rates. Significant differences between U.S. dollar interest rates and foreign currency interest rates may further impact the effectiveness of the Fund's currency hedging strategy. There can be no assurance that the Fund's hedging transactions will be effective. The Fund's currency hedging activities will potentially increase or accelerate distributions to shareholders, increase distributions taxed to individuals as ordinary income, result in the re-characterization of prior ordinary income distributions as return of capital, or generate losses that cannot be used to offset income or capital gain in subsequent years. The Fund will bear the costs associated with any such hedging transaction, regardless of any gain or loss experienced on the hedging transaction.

Currency Risk: Despite the Fund's currency hedging strategy, the value of the Fund's assets may be affected favorably or unfavorably by currency exchange rates, currency exchange control regulations, and restrictions or prohibitions on the repatriation of foreign currencies. Foreign currency exchange rates may have significant volatility, and changes in the values of foreign currencies against the U.S. dollar may result in substantial declines in the values of the Fund's, or the Portfolio's, assets denominated in foreign currencies. Because the Fund's, or the Portfolio's, net asset values (“NAVs”) are determined in U.S. dollars, the Fund's NAV could decline if the currency of a non-U.S. market in which the Fund invests depreciates against the U.S. dollar and the Fund's attempt to hedge currency exposure is unsuccessful. Generally, an increase in the value of the U.S. dollar against a foreign currency will reduce the value of a security denominated in that foreign currency when measured in U.S. dollars, thereby decreasing the Fund's overall NAV. A foreign currency may be affected favorably or unfavorably by currency exchange rates, currency control regulations and restrictions or prohibitions on the repatriation of the foreign currency. Fluctuations in the exchange values of currencies could affect the economy or particular business operations of companies in a geographic region in which the Fund or the Portfolio invests, causing an adverse impact on the Fund's, or the Portfolio's, investments in the affected region and the United States. As a result, investors have the potential for losses regardless of the length of time they intend to hold Fund Shares.

invested at times, generally as a result of cash flows into or out of the Fund or reserves of cash held by the Fund to meet redemptions. The Adviser may attempt to replicate the Index return by investing in fewer than all of the securities in the Index, or in some securities not included in the Index, potentially increasing the risk of divergence between the Fund's return and that of the Index.

in large amounts rapidly or unexpectedly (collectively, such transactions are referred to as “large shareholder transactions”). Large shareholder transactions could adversely affect the ability of the Portfolio or Fund to conduct its investment program.

Underlying Fund Risk: The Fund currently intends to gain all of its investment exposure to, and track the performance of, the index constituents by investing in another pooled investment vehicle (an “underlying fund”). The ability of the Fund to meet its investment objective with respect to the index constituents is directly related to the ability of the underlying fund to meet its investment objective. The Adviser serves as investment adviser to the underlying fund, leading to potential conflicts of interest. The Fund will bear its pro rata portion of the expenses incurred by the underlying fund. Substantial redemptions by other investors in an underlying fund may affect the underlying fund's investment program adversely and limit the ability of the underlying fund to achieve its objective.

Performance

The bar chart and table below provide some indication of the risks of investing in the Hedged International Developed Equity Index Fund by illustrating the variability of the Fund's returns from year-to-year and by showing how the Fund's average annual returns for the periods indicated compared with that of (i) a broad measure of market performance and (ii) the Index. The bar chart shows how the Class K shares' returns have varied for each full calendar year shown. Except for differences in returns resulting from differences in fees and expenses, all share classes would have substantially similar returns because all share classes invest in the same portfolio of securities. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (800) 997-7327 or by visiting our website at www.ssga.com.

Annual Total Return (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	14.53%	Q2 2020
Lowest Quarterly Return	-20.79%	Q1 2020

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Since Inception
	One Year	Five Years	5/29/2015
Class K
Return Before Taxes	13.69 %	9.64 %	7.65 %
Return After Taxes on Distributions	12.89 %	7.85 %	6.16 %
Return After Taxes on Distributions and Sale of Fund Shares	8.71 %	7.14 %	5.70 %
MSCI EAFE 100% Hedged to USD Index (reflects no deduction for fees, expenses or taxes other than withholding taxes on reinvested dividends)	14.14 %	9.84 %	7.94 %
MSCI ACWI ex USA Index (reflects no deduction for fees, expenses or taxes other than withholding taxes on reinvested dividends)	5.53 %	4.10 %	4.27 %

The Fund will make updated performance information, including its current net asset value, available at the Fund's website: www.ssga.com.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

The professionals primarily responsible for the day-to-day management of the Fund are Karl Schneider and David Chin, each of which has served as a portfolio manager of the Fund since inception in 2015.

Karl Schneider, CAIA, is a Managing Director of the Adviser and Co-Head of the Systematic Equity Group in the Americas. He joined the Adviser in 1997.

David Chin is a Vice President of the Adviser and a Senior Portfolio Manager in the Systematic Equity Group. He joined the Adviser in 1999.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Class K
To establish an account	None
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

Written Requests and Wire Transfers. You may purchase or redeem Fund Shares by written request or wire transfer.

Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Intermediary:

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

State Street International Developed Equity Index Fund

Investment Objective

The State Street International Developed Equity Index Fund (the “International Developed Equity Index Fund” or sometimes referred to in context as the “Fund”) seeks to provide investment results that, before fees and expenses, correspond generally to the total return performance of a broad-based developed market (ex-U.S. and Canada) large and mid-capitalization equity index over the long term.

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Management Fee1	0.11%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%
Other Expenses2	0.75%
Total Annual Fund Operating Expenses	0.86%
Less Fee Waivers and/or Expense Reimbursements3	(0.72)%
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	0.14%

The Fund's investment adviser, SSGA Funds Management, Inc. (the “Adviser” or “SSGA FM”), is contractually obligated until April 30, 2026 to waive the portion of the Fund's management fee attributable to the Fund's assets invested in the Portfolio. This arrangement may not be terminated prior to April 30, 2026 except with the approval of the Fund's Board of Trustees.

Other Expenses are based on estimates for the current fiscal year.

The Fund's investment adviser, SSGA Funds Management, Inc. (the “Adviser” or “SSGA FM”), is contractually obligated until April 30, 2026 (i) to waive up to the full amount of the advisory fee payable by the Fund, and/or (ii) to reimburse the Fund to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, extraordinary expenses, acquired fund fees and expenses, any class-specific expenses, such as distribution, shareholder servicing, sub-transfer agency and administration fees) exceed 0.09% of average daily net assets on an annual basis. This waiver and/or reimbursement may not be terminated prior to April 30, 2026 except with approval of the Fund's Board of Trustees.

Example:

1 year	3 years
$14	$202

Portfolio Turnover:

held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund's performance. The Fund's portfolio turnover rate has been omitted because the Fund had not commenced investment operations prior to the end of the most recent fiscal year.

Principal Investment Strategies

The Fund is an “index” fund that seeks to track, before fees and expenses, the total return of the MSCI EAFE (Europe, Australasia, Far East) Index (the “Index”) over the long term. As an “index” fund, the Fund is not managed according to traditional methods of “active” investment management, which involve the buying and selling of securities based upon economic, financial and market analysis and investment judgment.

Under normal circumstances, the Fund invests substantially all, but as a matter of policy no less than 80%, of its net assets (plus borrowings, if any) in securities, or American Depositary Receipts (“ADRs”) or Global Depositary Receipts (“GDRs”) based on securities, comprising the Index, or in other funds, including funds sponsored by the Adviser or its affiliates, or in other investments, that the Adviser expects to provide a return highly correlated to the Index or a portion of the Index. The notional value of the Fund's investments in derivatives or other synthetic instruments that provide exposure comparable, in the judgment of the Adviser, to the foregoing types of investments may be counted toward satisfaction of this 80% policy. The Fund will provide shareholders with at least sixty (60) days' notice prior to any change in its policy to invest at least 80% of its assets as described in the foregoing. The Fund may invest in equity securities that are not included in the Index (including common stock, preferred stock, depositary receipts and shares of other investment companies), cash and cash equivalents or money market instruments, such as repurchase agreements and money market funds (including money market funds advised by the Adviser). The Fund may use derivatives, including futures contracts and options, swaps, and contracts for differences, to obtain investment exposures that the Adviser expects to correlate closely with the Index or a portion of the Index.

The Fund currently intends to invest nearly all of its assets in the Portfolio, another open-end investment company managed by the Adviser, with an investment objective and policies substantially identical to those of the Fund. When the Fund invests in this “master-feeder” structure, the Fund's only investments are shares of the Portfolio and it participates in the investment returns achieved by the Portfolio. Descriptions in this section of the investment activities of the “Fund” also generally describe the expected investment activities of the Portfolio.

The Index is a free float-adjusted market capitalization index that is designed to capture large and mid-cap securities in developed market countries, excluding the United States and Canada. As of February 28, 2025, the Index comprised 722 securities covering companies across 21 countries and represented 85% of the free float-adjusted market capitalization of those countries. As of February 28, 2025, a significant portion of the Index comprised companies in the financials sector and companies located in Japan and the United Kingdom and a significant portion of the Index constituents are denominated in the Yen, the Pound Sterling and the Euro, although this may change from time to time. As of February 28, 2025, the full market capitalization of the companies included in the Index ranged from $1.94 billion to $289.46 bil

lion. As of February 28, 2025, countries covered in the Index included Australia, Austria, Belgium, Denmark, Finland, France, Germany, Hong Kong, Ireland, Israel, Italy, Japan, the Netherlands, New Zealand, Norway, Portugal, Singapore, Spain, Sweden, Switzerland and the United Kingdom, although this may change from time to time.

Principal Risks

Europe: Developed and emerging market countries in Europe will be significantly affected by the fiscal and monetary controls of the Economic and Monetary Union of the European Union (“EU”). Changes in regulations on trade, decreasing imports or exports, changes in the exchange rate of the euro and recessions among European countries may have a significant adverse effect on the economies of other European countries. In addition, one or more countries may abandon the euro and/or withdraw from the EU On January 31, 2020, the United Kingdom (“UK”) formally withdrew from the EU (commonly known as “Brexit”). An agreement between the UK and the EU governing their future trade relationship became effective January 1, 2021, but that agreement does not include an agreement on financial services, and it is unlikely that such agreement will be concluded. Moreover, the UK government has started a program of financial services law reform with the ultimate aim of repealing many EU financial services laws that were assimilated into UK law from January 1, 2021, and replacing them with legislation or rules made by the UK government or financial services regulators. Accordingly, uncertainty remains in certain areas as to the future relationship between the UK and the EU. Brexit has already had a significant impact on the UK, Europe, and global economies, and could continue to result in volatility and illiquidity, legal, political, economic and regulatory uncertainties and lower economic growth for these economies that could in turn have an adverse effect on the value of the Fund's investments. Any further exits from the EU, or the possibility of such exits, or the abandonment of the euro, may cause additional market disruption globally and introduce new legal and regulatory uncertainties. In addition, a number of countries in Europe have suffered terrorist attacks and additional attacks may occur in the future. Such attacks may cause uncertainty in financial markets and may adversely affect the performance of the issuers to which the Fund has exposure.

portfolio managed using an active investment strategy. The structure and composition of the Index will affect the performance, volatility, and risk of the Index and, consequently, the performance, volatility, and risk of the Fund. While the Adviser seeks to track the performance of the Index (i.e., achieve a high degree of correlation with the Index), the Fund's return may not match the return of the Index. The Fund incurs a number of operating expenses not applicable to the Index, and incurs costs in buying and selling securities. In addition, the Fund may not be fully invested at times, generally as a result of cash flows into or out of the Fund or reserves of cash held by the Fund to meet redemptions. The Adviser may attempt to replicate the Index return by investing in fewer than all of the securities in the Index, or in some securities not included in the Index, potentially increasing the risk of divergence between the Fund's return and that of the Index.

Performance

Performance information for the Fund has been omitted because the Fund had not commenced investment operations as of the date of this Prospectus. Once the Fund has completed a full calendar year of operations, a bar chart and table will be included that will provide some indication of the risks of investing in the Fund by showing the variability of the Fund's returns based on net assets and comparing the Fund's performance to the Index. The Fund will make updated performance information, including its current net asset value, available at the Fund's website: www.ssga.com.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund and the Portfolio.

The professionals primarily responsible for the day-to-day management of the Portfolio and the Fund are Karl Schneider and David Chin, each of which has served as a portfolio manager of the Fund since organization in 2015.

Karl Schneider, CAIA, is a Managing Director of the Adviser and Co-Head of the Systematic Equity Group in the Americas. He joined the Adviser in 1997.

David Chin is a Vice President of the Adviser and a Senior Portfolio Manager in the Systematic Equity Group. He joined the Adviser in 1999.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Class K
To establish an account	None
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

Written Requests and Wire Transfers. You may purchase or redeem Fund Shares by written request or wire transfer.

Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Intermediary:

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

Additional Information About Investment Objectives, Principal Strategies and Risks

Investment Objective

State Street Hedged International Developed Equity Index Fund

Principal Investment Strategies

In seeking to track the performance of the Index, the Fund expects to employ a sampling strategy, which means that the Fund will not typically purchase all of the securities represented in the Index. Instead, the Fund may purchase a subset of the securities in the Index or other investments in an effort to create a portfolio of securities with generally the same risk and return characteristics of the Index. The number of holdings in the Fund will be based on a number of factors, including the asset size of the Fund. Based on its analysis of these factors, SSGA FM may, instead, invest the Fund's assets in substantially all of the securities represented in the Index in approximately the same proportions as the Index.

Other Derivative Transactions. The Fund may enter into derivatives transactions involving options and swaps. These transactions involve many of the same risks as those described above under “Index Futures Contracts and Related Options.” In addition, since many of such transactions are conducted directly with counterparties, and not on an exchange or board of trade, the Fund's ability to realize any investment return on such transactions is generally subject to greater risk such that the counterparty will be unable or unwilling to meet its obligations.

base; (iii) the location of the issuer's headquarters; (iv) the geographic distribution of the issuer's operations (in terms of assets and revenues); (v) the issuer's history with respect to these criteria; and (vi) the country in which investors consider the issuer to be most appropriately classified based on communications between the Index Provider and investors.

State Street International Developed Equity Index Fund

Principal Investment Strategies

In seeking to track the performance of the Index, the Fund expects to employ a sampling strategy, which means that the Fund will not typically purchase all of the securities represented in the Index. Instead, the Fund may purchase a subset of the securities in the Index or other investments in an effort to create a portfolio of securities with generally the same risk and return characteristics of the Index. The number of holdings in the Fund will be based on a number of factors, including the asset size of the Fund. Based on its analysis of these factors, SSGA FM may, instead, invest the Fund's assets in substantially all of the securities represented in the Index in approximately the same proportions as the Index.

Under normal circumstances, the Fund invests substantially all, but as a matter of policy no less than 80%, of its net assets (plus borrowings, if any) in securities, or American Depositary Receipts (“ADRs”) or Global Depositary Receipts (“GDRs”) based on securities, comprising the Index, or in other funds, including funds sponsored by the Adviser or its affiliates, or in other investments, that the Adviser expects to provide a return highly correlated to the Index or a portion of the Index. The notional value of the Fund's investments in derivatives or other synthetic instruments that provide exposure comparable, in the judgment of the Adviser, to the foregoing types of investments may be counted toward satisfaction of this 80% policy. The Fund will provide shareholders with at least sixty (60) days' notice prior to any change in its policy to invest at least 80% of its assets as described in the foregoing. The Fund may invest in equity securities that are not included in the Index (including common stock, preferred stock, depositary receipts and shares of other investment companies), cash and cash equivalents or money market instruments, such as repurchase agreements and money market funds (including money market funds advised by the Adviser). The Fund may use derivatives, including futures contracts and options, swaps, and contracts for differences, to obtain investment exposures that the Adviser expects to correlate closely with the Index or a portion of the Index.

Other Derivative Transactions. The Fund may enter into derivatives transactions involving options and swaps. These transactions involve many of the same risks as those described above under “Index Futures Contracts and Related Options.” In addition, since many of such transactions are conducted directly with counterparties, and not on an exchange or board of trade, the Fund's ability to realize any investment return on such transactions is generally subject to greater risk such that the counterparty will be unable or unwilling to meet its obligations.

Additional Information About Risks

Currency Hedging Risk (principal risk for the Hedged International Developed Equity Index Fund). When a derivative is used as a hedge against a position that a Fund holds, any gain generated by the derivative generally should be substantially offset by losses on the hedged investment, and vice versa. While hedging can reduce or eliminate losses, it can also reduce or eliminate gains. Hedges are sometimes subject to imperfect matching between a derivative and its reference asset. For example, because the Fund's currency hedge is reset on a monthly basis, based on the size of the Fund's exposure to a currency at a certain point in time, the size of each currency hedge could be greater or less than the Fund's total exposure in that currency intra-month and currency risk may develop or increase between resets. Furthermore, while the Fund is designed to hedge against currency fluctuations, it is possible that a degree of currency exposure may remain even at the time a hedging transaction is implemented. As a result, changes in currency exchange rates may affect Fund returns even when the hedge works as intended. The effectiveness of a Fund's currency hedging strategy will also generally be affected by the volatility of both the securities included in the Index, and the volatility of the U.S. dollar relative to the currencies to be hedged. Increased volatility may reduce the effectiveness of a Fund's currency hedging strategy and may impact the costs associated with hedging transactions. The effectiveness of a Fund's currency hedging strategy and the costs associated with hedging transactions may also in general be affected by interest rates. Significant differences between U.S. dollar interest rates and foreign currency interest rates may further impact the effectiveness of a Fund's currency hedging strategy. There can be no assurance that a Fund's hedging transactions will be effective. A Fund's currency hedging activities will potentially increase or accelerate distributions to shareholders, increase distributions taxed to individuals as ordinary income, result in the re-characterization of prior ordinary income distributions as return of capital, or generate losses that cannot be used to offset income or capital gain in subsequent years. A Fund will bear the costs associated with any such hedging transaction, regardless of any gain or loss experienced on the hedging transaction.

information regarding issuers of securities underlying unsponsored depositary receipts may be more limited than for sponsored depositary receipts. The values of depositary receipts may decline for a number of reasons relating to the issuers or sponsors of the depositary receipts, including, but not limited to, insolvency of the issuer or sponsor. Holders of depositary receipts may have limited or no rights to take action with respect to the underlying securities or to compel the issuer of the receipts to take action. The prices of depositary receipts may differ from the prices of securities upon which they are based. To the extent the Fund invests in depositary receipts based on securities included in the Index, such differences in prices may increase index tracking risk.

nomic growth. In the past, the UK has been a target of terrorism. Acts of terrorism in the UK or against British interests abroad may cause uncertainty in the British financial markets and adversely affect the performance of the issuers to which a Fund has exposure.

Indexing Strategy/Index Tracking Risk. The Fund is managed with an indexing investment strategy, attempting to track the performance of an unmanaged index of securities. The Fund will seek to replicate Index returns, regardless of the current or projected performance of the Index or of the actual securities comprising the Index. This differs from an actively-managed fund, which typically seeks to outperform a benchmark index. The Fund generally will buy and will not sell a security included in the Index as long as the security is part of the Index regardless of any sudden or material decline in value or foreseeable material decline in value of the security, even though the Adviser may make a different investment decision for other actively managed accounts or portfolios that hold the security. As a result, a Fund's performance may be less favorable than that of a portfolio managed using an active investment strategy. The structure and composition of the Index will affect the performance, volatility, and risk of the Index (in absolute terms and by comparison with other indices) and, consequently, the performance, volatility, and risk of a Fund. Errors in index data, index computations or the construction of the Index in accordance with its methodology may occur from time to time and may not be identified and corrected by the Index Provider for a period of time or at all, which may have an adverse impact on a Fund and its shareholders. While the Adviser seeks to track the performance of the Index (i.e., achieve a high degree of correlation with the Index), a Fund's return may not match the return of the Index for a number of reasons. For example, the return on the sample of securities purchased by a Fund (or the return on securities not included in the Index) to replicate the performance of the Index may not correlate precisely with the return of the Index. The Fund incurs a number of operating expenses not applicable to the Index, and incurs costs in buying and selling securities. In addition, a Fund may not be fully invested at times, either as a result of cash flows into or out of the Fund or reserves of cash held by the Fund to meet redemptions. The Adviser may attempt to track the Index return by investing in fewer than all of the securities in the Index, or in some securities not included in the Index, potentially increasing the risk of divergence between a Fund's return and that of the Index. Changes in the composition of the Index and regulatory requirements also may impact a Fund's ability to match the return of the Index. The Adviser may apply one or more “screens” or investment techniques to refine or limit the number or types of issuers included in the Index in which a Fund may invest. Application of such screens or techniques may result in investment performance below that of the Index and may not produce results expected by the Adviser. Index tracking risk may be heightened during times of increased market volatility or other unusual market conditions.

Large Transactions Risk. To the extent a large proportion of the shares of a Portfolio or Fund are highly concentrated or held by a small number of shareholders (or a single shareholder), including funds or accounts over which the Adviser has investment discretion, a Fund is subject to the risk that these shareholders will purchase or redeem Portfolio or Fund shares in large amounts rapidly or unexpectedly, including as a result of an asset allocation decision made by the Adviser. In addition, a large number of shareholders collectively may purchase or redeem Portfolio or Fund shares in large amounts rapidly or unexpectedly (collectively, such transactions are referred to as “large shareholder transactions”). Large shareholder transactions could adversely affect the ability of a Fund to conduct its investment program. For example, they could require a Portfolio or Fund to sell portfolio securities or purchase portfolio securities unexpectedly and incur substantial transaction costs and/or accelerate the realization of taxable income and/or gains to shareholders. The effects of taxable income and/or gains resulting from large shareholder transactions would particularly impact non-redeeming shareholders who do not hold their Fund shares in an IRA, 401(k) plan or other tax-advantaged plan. To the extent that such transactions result in short-term capital gains, such gains will generally be taxed at the ordinary income tax rate for shareholders who hold Fund shares in a taxable account. In addition, a Portfolio or Fund may be required to sell its more liquid portfolio investments to meet a large redemption, in which case a Fund's remaining assets may be less liquid, more volatile, and more difficult to price. A Portfolio or Fund may hold a relatively large proportion of its assets in cash in anticipation of large redemptions, diluting its investment returns. A number of circumstances may cause a Portfolio or Fund to experience large redemptions, such as changes in investors' circumstances; changes in the eligibility criteria for a Portfolio or Fund or share class of the Fund; liquidations, reorganizations, repositionings, or other announced Portfolio or Fund events; or changes in investment objectives, strategies, policies, risks, or investment personnel.

Master/Feeder Structure Risk (principal risk for the International Developed Equity Index Fund). The Fund pursues its objective by investing substantially all of its assets in another pooled investment vehicle (a “master fund”). The ability of a Fund to meet its investment objective is directly related to the ability of the master fund to meet its investment objective. The ability of a Fund to meet its objective may be adversely affected by the purchase and redemption activities of other investors in the master fund. The ability of a Fund to meet redemption requests will depend on its ability to redeem its interest in the master fund. The Adviser or an affiliate serves as investment adviser to the master fund, leading to potential conflicts of interest. For example, the Adviser or its affiliates will receive fees based on the amount of assets invested in the master fund. Investment by a Fund in the master fund may be beneficial in the management of the master fund, by helping to achieve economies of scale or enhancing cash flows. Due to this and other factors, the Adviser may have an incentive to invest a Fund's assets in a master fund sponsored or managed by the Adviser or its affiliates in lieu of investments by a Fund directly in portfolio securities, or may have an incentive to invest in such master fund over a master fund sponsored or managed by others. Similarly, the Adviser may have an incentive to delay or decide against the sale of interests held by a Fund in a master fund sponsored or managed by the Adviser or its affiliates. It is possible that other clients of the Adviser or its affiliates will purchase or sell interests in a master fund sponsored or managed by the Adviser or its affiliates at prices and at times more favorable than those at which a Fund does so. A Fund will bear its pro rata portion of the expenses incurred by the master fund.

Mid-Capitalization Securities Risk. The securities of mid-capitalization companies may be more volatile and may involve more risk than the securities of larger companies. These companies may have limited product lines, markets or financial resources, may lack the competitive strength of larger companies, and may depend on a few key employees. In addition, these companies may have been recently organized and may have little or no track record of success. The securities of

mid-sized companies may trade less frequently and in smaller volumes than more widely held securities. The prices of these securities may fluctuate more sharply than those of other securities, and a Fund may experience some difficulty in establishing or closing out positions in these securities at prevailing market prices. There may be less publicly available information about the issuers of these securities or less market interest in these securities than in the case of larger companies, both of which can cause significant price volatility. Some securities of mid-sized issuers may be illiquid or may be restricted as to resale. Returns on investments in securities of mid-capitalization companies could trail the returns on investments in securities of larger or smaller companies.

from it. A Fund may be required to borrow monies it had otherwise expected to receive in connection with the settlement of securities sold by it, in order to meet its obligations to others. Limits on the ability of a Fund to purchase or sell securities due to settlement delays could increase any variance between a Fund's performance and that of its benchmark index.

Underlying Fund Risk (principal risk for the Hedged International Developed Equity Index Fund). The Fund currently intends to gain all of its investment exposure to, and track the performance of, the Index constituents by investing in another pooled investment vehicle (an “underlying fund”). The ability of the Fund to meet its investment objective with respect to the Index constituents is directly related to the ability of the underlying fund to meet its investment objective. The ability of the Fund to meet its objective may be adversely affected by the purchase and redemption activities of other investors in the underlying fund. The ability of the Fund to meet redemption requests will depend on its ability to redeem its interest in the underlying fund. The Adviser serves as investment adviser to the underlying fund, leading to potential conflicts of interest. For example, the Adviser or its affiliates will receive fees based on the amount of assets invested in the underlying fund. Investment by the Fund in the underlying fund may be beneficial in the management of the underlying fund, by helping to achieve economies of scale or enhancing cash flows. Due to this and other factors, the Adviser may have an incentive to invest the Fund's assets in a master fund sponsored or managed by the Adviser or its affiliates in lieu of investments by the Fund directly in portfolio securities, or may have an incentive to invest in such underlying fund over a underlying fund sponsored or managed by others. Similarly, the Adviser may have an incentive to delay or decide against the sale of interests held by the Fund in a underlying fund sponsored or managed by the Adviser or its affiliates. It is possible that other clients of the Adviser or its affiliates will purchase or sell interests in a underlying fund sponsored or managed by the Adviser or its affiliates at prices and at times more favorable than those at which the Fund does so. The Fund will bear its pro rata portion of the expenses incurred by the underlying fund.

Additional Information About Non-Principal Investment Strategies and Risks

clients or affiliates. The Adviser and its affiliates may invest for clients in various securities that are senior, pari passu or junior to, or have interests different from or adverse to, the securities that are owned by a Fund. The Adviser or its affiliates, in connection with its other business activities, may acquire material nonpublic confidential information that may restrict the Adviser from purchasing securities or selling securities for itself or its clients (including the Funds) or otherwise using such information for the benefit of its clients or itself.

Cybersecurity Risk. With the increased use of technologies such as the Internet and the dependence on computer systems to perform business and operational functions, funds (such as the Funds and the Portfolio) and their service providers (including the Adviser) may be prone to operational and information security risks resulting from cyber-attacks and/or technological malfunctions. Furthermore, geopolitical tensions may have increased the scale and sophistication of deliberate cybersecurity attacks, particularly those from nation-states or from entities with nation-state backing. In general, cyber-attacks are deliberate, but unintentional events may have similar effects. Cyber-attacks include, among others, stealing or corrupting data maintained online or digitally, preventing legitimate users from accessing information or services on a website, releasing confidential information without authorization, and causing operational disruption. Successful cyber-attacks against, or security breakdowns of, a Fund, the Adviser or a custodian, transfer agent, or other affiliated or third-party service provider may adversely affect a Fund or its shareholders. For instance, cyber-attacks or technical malfunctions may interfere with the processing of shareholder or other transactions, affect a Fund's ability to calculate its NAV, cause the release of private shareholder information or confidential Fund information, impede trading, cause reputational damage, and subject a Fund to regulatory fines, penalties or financial losses, reimbursement or other compensation costs, and additional compliance costs. Cyber-attacks or technical malfunctions may render records of Fund assets and transactions, shareholder ownership of Fund Shares, and other data integral to the functioning of a Fund inaccessible or inaccurate or incomplete. A Fund may also incur substantial costs for cybersecurity risk management in order to prevent cyber incidents in the future. A Fund and its shareholders could be negatively impacted as a result. While the Adviser has established business continuity plans and systems designed to minimize the risk of cyber-attacks through the use of technology, processes and controls, there are inherent limitations in such plans and systems, including the possibility that certain risks have not been identified, given the evolving nature of this threat. The use of artificial intelligence (“AI”) and machine learning could exacerbate these risks or result in cyber security incidents that implicate personal data. Each Fund relies on third-party service providers for many of its day-to-day operations, and will be subject to the risk that the protections and protocols implemented by those service providers will be ineffective to protect the Fund from cyber-attack. The Adviser does not control the cybersecurity plans and systems put in place by third-party service providers, and such third-party service providers may have limited indemnification obligations to the Adviser or the Funds. Similar types of cybersecurity risks or technical malfunctions also are present for issuers of securities in which each Fund invests, which could result in material adverse consequences for such issuers, and may cause a Fund's investment in such securities to lose value.

shares at $1.00 per share at times when the fair value of the money market fund's portfolio per share is more or less than $1.00. The SEC has adopted amendments to money market fund regulation that, among other things, increase the daily and weekly liquid asset requirements. Such amendments may limit the Funds' investment flexibility and reduce its ability to generate returns. None of State Street Corporation, State Street Bank and Trust Company (“State Street”), State Street Global Advisors (“SSGA”), SSGA FM or their affiliates (“State Street Entities”) guarantee the value of an investment in a money market fund at $1.00 per share. Investors should have no expectation of capital support to a money market fund from State Street Entities. Other money market funds price and transact at a “floating” NAV that will fluctuate along with changes in the market-based value of fund assets. Shares sold utilizing a floating NAV may be worth more or less than their original purchase price. Recent changes in the regulation of money market funds may affect the operations and structures of money market funds. A money market fund may be permitted or required to impose redemption fees during times of market stress.

Portfolio Holdings Disclosure

The Funds' portfolio holdings disclosure policy is described in the Statement of Additional Information (“SAI”).

Management and Organization

The International Developed Equity Index Fund invests through a “master-feeder” structure. The Fund seeks to achieve its investment objective by investing substantially all of its investable assets in the Portfolio, a separate mutual fund, that has substantially similar investment strategies and risks as the Fund. Descriptions of the investment activities of the Fund also generally describe the expected investment activities of the Portfolio. The Hedged International Developed Equity Index Fund gains all of its investment exposure to the Index constituents by investing in the Portfolio, a separate mutual fund that, aside from the currency hedging activities performed by the Fund, has substantially similar investment strategies and risks as the Fund. Descriptions of the investment activities of the Fund also generally describe the expected investment activities of the Portfolio. Either Fund can withdraw its investment in the Portfolio if, at any time, the Fund's Board of Trustees determines that it would be in the best interests of the Fund's shareholders, or if the investment objectives or strategies of the Portfolio changed so that they were inconsistent with the objectives or strategies of the Fund. If a Fund withdraws its investment from the Portfolio, the Fund may invest all of its assets in another mutual fund that has substantially similar investment strategies to those of the Fund, the Adviser may directly manage the Fund's assets, or the Board may take such other action it deems appropriate and in the best interests of shareholders of the Fund, which may include liquidation of the Fund.

Investment Adviser

State Street Hedged International Developed Equity Index Fund	0.14%
State Street International Developed Equity Index Fund	0.11%

The amount each Fund pays under its Investment Advisory Agreement is reduced by the amount of the advisory fee it bears indirectly through its investment in the Portfolio. For the services provided under its Investment Advisory Agreement, the Portfolio pays the Adviser a management fee at an annual rate of 0.11% of the Portfolio's average daily net assets. The arrangement between the Hedged International Developed Equity Index Fund and the Adviser may not be terminated except with the approval of the Board.

Total Annual Fund Operating Expense Waiver. For the Hedged International Developed Equity Index Fund, SSGA FM, as the investment adviser to the Fund, is contractually obligated, through April 30, 2026, (i) to waive up to the full amount of the advisory fee payable by the Fund, and/or (ii) to reimburse the Fund for expenses to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, extraordinary expenses, acquired fund fees other than the fees of the Portfolio, and any class-specific expenses, such as distribution, shareholder servicing, sub-transfer agency and administration fees) exceed 0.15% of average daily net assets on an annual basis. Additionally, for the International Developed Equity Index Fund, SSGA FM, as the investment adviser to the Fund, is contractually obligated, through April 30, 2026, (i) to waive up to the full amount of the advisory fee payable by the Fund, and/or (ii) to reimburse the Fund for expenses to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, extraordinary expenses, acquired fund fees, and any class-specific expenses,

such as distribution, shareholder servicing, sub-transfer agency and administration fees) exceed 0.09% of average daily net assets on an annual basis. These waiver and/or reimbursement arrangements may not be terminated prior to April 30, 2026 except with approval of the Funds' Board of Trustees.

A discussion regarding the Board's consideration of the Funds' Investment Advisory Agreement is provided in the Funds' Form N-CSR filing with the SEC for the period ended June 30, 2024 for the Hedged International Developed Equity Index Fund and, for the International Developed Equity Index Fund, will be included in that Fund's Form N-CSR filing, as applicable, after that Fund commences operations.

The Adviser manages the Funds using a team of investment professionals. The team approach is used to create an environment that encourages the flow of investment ideas. The portfolio managers within the team work together in a cohesive manner to develop and enhance techniques that drive the investment process for the respective investment strategy. This approach requires portfolio managers to share a variety of responsibilities, including investment strategy and analysis, while retaining responsibility for the implementation of the strategy within any particular portfolio. The approach also enables the team to draw upon the resources of other groups within SSGA. Each portfolio management team is overseen by SSGA's internal governance.

Key professionals involved in the day-to-day portfolio management of the Funds include the following:

David Chin is a Vice President of SSGA and the Adviser and a Senior Portfolio Manager in the Systematic Equity Group. He is responsible for managing a full range of equity index and tax-efficient products. Prior to joining SSGA in 1999, Mr. Chin worked at Frank Russell Company, OneSource Information Systems, and PanAgora Asset Management. Mr. Chin has been working in the investment management field since 1992. Mr. Chin holds a Bachelor of Science in Management Information Systems from the University of Massachusetts/Boston and a Master of Business Administration from the University of Arizona.

Additional information about the portfolio managers' compensation, other accounts managed by the portfolio managers, and the portfolio managers' ownership of the Funds is available in the SAI.

Other Fund Services

The Administrator, Sub-Administrator and Custodian

The Adviser serves as administrator of each Fund. The amount of the fee paid to the Adviser for administrative services may vary by share class. Each Fund currently pays the Adviser an administrative fee at the annual rate of 0.05% with respect to each of its share classes. State Street, a subsidiary of State Street Corporation, serves as sub-administrator for the Funds for a fee that is paid by the Adviser. State Street also serves as custodian of the Funds for a separate fee that is paid by the Funds. SSGA FM serves as administrator of the Portfolio and State Street serves as sub-administrator and custodian of the Portfolio.

The Transfer Agent and Dividend Disbursing Agent

SS&C GIDS, Inc. is the Funds' transfer agent and dividend disbursing agent (the “Transfer Agent”).

The Distributor

State Street Global Advisors Funds Distributors, LLC serves as the Funds' distributor (“SSGA FD”) pursuant to the Distribution Agreement between SSGA FD and the Trust.

Additional Information

Shareholder Information

Determination of Net Asset Value

Each Fund determines its NAV per share once each business day as of the scheduled close of regular trading on the New York Stock Exchange (the “NYSE”). Pricing does not occur on NYSE holidays. A business day is one on which the NYSE is open for regular trading. The Federal Reserve is closed on certain holidays on which the NYSE is open. These holidays are Columbus Day and Veterans Day. On these holidays, you will not be able to purchase shares by wiring Federal Funds because Federal Funds wiring does not occur on days when the Federal Reserve is closed. In unusual circumstances, such as an emergency or an unscheduled close or halt of trading on the NYSE, the time at which share prices are determined may be changed. The NAV per share is based on the market value of the investments held in a Fund. The NAV of each class of a Fund's Shares is calculated by dividing the value of the assets of the Fund attributable to that class less the liabilities of the Fund attributable to that class by the number of shares in the class outstanding.As noted in this Prospectus, each Fund may invest in securities listed on foreign exchanges, or otherwise traded in a foreign market, and those securities may trade on weekends or other days when each Fund does not price its shares. Consequently, the NAV of each Fund's Shares may change on days when shareholders are not able to purchase or redeem the Fund's Shares. Purchase and redemption orders for Fund Shares are processed, respectively, at the NAV next determined after the Fund accepts a purchase order or receives a redemption request in good form. Each Fund values each security or other investment pursuant to guidelines adopted by the Board. The Board has appointed the Adviser as the valuation designee to fair value securities or other investments pursuant to procedures approved by the Funds' Board, under certain limited circumstances. For example, fair value pricing may be used when market quotations are not readily available or reliable, such as when (i) trading for a security is restricted; or (ii) a significant event, as determined by the Adviser, that may affect the value of one or more securities or other investments held by a Fund occurs after the close of a related exchange but before the determination of a Fund's NAV. Attempts to determine the fair value of securities or other investments introduce an element of subjectivity to the pricing of securities or other investments. As a result, the price of a security or other investment determined through fair valuation techniques may differ from the price quoted or published by other sources and may not accurately reflect the price a Fund would have received had it sold the investment. To the extent that a Fund invests in the shares of other registered open-end investment companies that are not traded on an exchange (mutual funds), such shares are valued at their published NAVs per share as reported by the funds. The prospectuses of these funds explain the circumstances under which the funds will use fair value pricing and the effects of using fair value pricing.

Investing in State Street Institutional Investment Trust Shares

Purchasing Shares

Any applicable minimum purchase amount may be waived for specific investors or types of investors, including, without limitation, retirement plans, employees of State Street Corporation and its affiliates and their family. In the case of shareholders purchasing shares through a Financial Intermediary, the minimum purchase amount may be applied at the level of the Financial Intermediary.

	Class K
Availability	Limited to certain investors, including certain qualified recordkeepers, financial institutions and employer- sponsored retirement plans.
Minimum Initial Investment	There is no minimum investment for Class K shares.
Maximum Investment	None.
Initial (Front-End) Sales Charge	None. Entire purchase price is invested in shares of a Fund.
Deferred (CDSC) Sales Charge	None.
Distribution and Service (Rule 12b-1) Fees	None.

Class K

Class K shares are available to the following categories of investors:

Banks, broker-dealers and other financial institutions (including registered investment advisers and financial planners) purchasing Fund Shares on behalf of their clients in:

•

Discretionary and non-discretionary advisory programs;

•

Fund "supermarkets";

•

Asset allocation programs;

•

Other programs in which the client pays an asset-based fee for advice or for executing transactions in Fund Shares or for otherwise participating in the program; or

•

Certain other investment programs that do not charge an asset-based fee;

Qualified recordkeepers with an applicable agreement maintained with SSGA FD;

Endowments and foundations, and defined contribution, defined benefit, and other employer-sponsored employee benefit plans, whether or not qualified under the Code;

Certain other registered open-end investment companies whose shares are distributed by SSGA FD;

Qualified state tuition plans described in Section 529 of the Code and donor-advised charitable gift funds (subject to all applicable terms and conditions);

Health Savings Accounts under Section 223 of the Code if such accounts are maintained by the Fund at an omnibus level;

Collective investment trusts.

There is no minimum investment for Class K shares.

How to Initiate a Purchase Request

Investing in the State Street Funds Through a Financial Intermediary

Account Applications and Other Documents. You may find many of the forms necessary to open an account online or by calling or writing to the State Street Funds. See Contacting the State Street Funds.

Please be sure to check Exchanging Shares and Frequent-Trading Limits below.

How to Pay for a Purchase

By Check. You may send a check to make initial or additional purchases to your fund account. Make your check payable to “State Street Funds” and include the appropriate fund name and account number (e.g., “State Street Hedged International Developed Equity Index Fund—a/c #xxx”) in the memo section of the check.

Trade Dates-Purchases

If your purchase request is not in good order, it may be rejected.

For further information about purchase transactions, consult our website at www.ssga.com or see Contacting the State Street Funds.

Other Purchase Policies You Should Know

Redeeming Shares

By Telephone. You may call the State Street Funds to request a redemption of shares. See Contacting the State Street Funds.

By Mail. You may send a written request to the State Street Funds to redeem from a Fund account or to make an exchange. See Contacting the State Street Funds.

Please be sure to check Exchanging Shares and Frequent-Trading Limits below.

Trade Date-Redemptions

The trade date for any redemption request received in good order will depend on the day and time the State Street Funds receive your request in good order and the manner in which you are redeeming.

How to Receive Redemption Proceeds

Other Redemption Policies that You Should Know

Address Changes. If your address of record has been changed within thirty (30) days of the redemption request, the request must be in writing and bear a medallion guarantee.

Significant/Unusual Economic or Market Activity. During periods of significant or unusual economic or market activity, you may encounter delays attempting to give instructions by phone.

Exchanging Shares

An exchange occurs when you use the proceeds from the redemption of shares of one State Street Fund to simultaneously purchase shares of a different State Street Fund. Exchanges may be made within the same class (i.e. Class K shares for Class K shares). Class N shares are also exchangeable for other share classes of State Street Funds and would be subject to the conditions for investing in the other class of shares described in the applicable prospectus. The account holding the original shares must be registered in the same name as the account holding the new shares received in the exchange. You may make exchange requests by telephone, or by mail. See Purchasing Shares and Redeeming Shares above.

Frequent-Trading Limits

As a means to protect each State Street Fund and its shareholders from Excessive Trading:

•

The State Street Funds' distributor has detailed procedures that document the transparency oversight and monitoring processes performed by the State Street Funds' transfer agent.

Service Options

Dividend and Capital Gain Distribution Option

Please refer to Dividends, Distributions and Tax Considerations below for additional information.

Automatic Withdrawal Plan

Telephone Redemptions and Exchanges

Automatic Investment Plan

Additional Shareholder Information

Account Transfers

Responsibility for Fraud

Right to Change Policies

In addition to the rights expressly stated elsewhere in this Prospectus, the State Street Funds reserve the right, in the future, to:

Alter, add, or discontinue any conditions of purchase (including eligibility requirements), redemption, exchange, service, or privilege at any time;

Accept initial purchases by telephone;

Alter, impose, discontinue, or waive any redemption fee, account service fee, or other fees charged to a group of shareholders; and

Unclaimed Property

Dividends, Distributions and Tax Considerations

Distribution Options. You can choose from four different distribution options as indicated on the application:

•

Income-Earned Option—Capital gain distributions will be automatically reinvested, but a check, direct deposit or wire will be sent for each dividend distribution.

•

Cash Option—A check, wire or direct deposit will be sent for each dividend and capital gain distribution.

•

Direct Dividends Option—Dividends and capital gain distributions will be automatically invested in another identically registered State Street Fund of the same share class.

Delivery of Documents to Accounts Sharing an Address

Tax Considerations

Each Fund invests substantially all of its assets in the Portfolio, which is treated as a partnership for U.S. federal income tax purposes, and the Hedged International Developed Equity Index Fund will use the balance of its assets to enter into foreign currency forward contracts, foreign currency futures and options, and currency swaps or purchase currency structured notes, in order to hedge the non-U.S. currency exposure created by the Portfolio's investment in foreign equities to the U.S. dollar. Because each Fund invests substantially all of its assets in the Portfolio, the nature and character of each Fund's income, gains, losses and deductions generally will be determined at the Portfolio level, and each Fund will be allocated its share of the Portfolio's income, gains, losses and deductions. As applicable, references in this discussion to income, gains and losses of a Fund will include references to income, gains and losses recognized and deductions accruing at the Portfolio level and allocated to or otherwise taken into account by the Fund, and references to assets of a Fund will include references to the Fund's allocable share of the assets of the Portfolio.

For U.S. federal income tax purposes, distributions of investment income generally are taxable to you as ordinary income. Taxes on distributions of capital gains generally are determined by how long the Fund or Portfolio owned (or is deemed to have owned) the investments that generated them, rather than how long you have owned your Fund Shares. Distributions of net capital gains (that is, the excess of net long-term capital gains over net short-term capital losses) from the sale of investments that a Fund or the Portfolio owned (or is deemed to have owned) for more than one year that are properly reported by a Fund as capital gain dividends generally will be treated as long-term capital gain includible in your net capital gain and taxed to individuals at reduced rates. Distributions of gains from investments that a Fund or Portfolio owned (or is deemed to have owned) for one year or less generally will be taxable to you as ordinary income. Distributions of investment income properly reported by a Fund as derived from “qualified dividend income,” which will not include income from the Fund's or the Portfolio's portfolio securities on loan, are taxed to individuals at the rates applicable to net capital gain, provided holding period and other requirements are met by both the shareholder and the Fund or the Portfolio, as applicable. Distributions are taxable to you even if they are paid from income or gains earned by a Fund, including through the Portfolio, before your investment (and thus were included in the price you paid for your shares). Distributions may also be subject to state and local taxes and are taxable whether you receive them in cash or reinvest them in additional shares. Distributions in excess of a Fund's current and accumulated earnings and profits are treated as a return of capital to the extent of your basis in the applicable Fund's shares, and, in general, as capital gain thereafter.

A Fund's and the Portfolio's income from or proceeds of dispositions of its investments in non-U.S. assets may be subject to non-U.S. withholding or other taxes, which will reduce the yield on those investments. In certain instances, a Fund may be entitled to elect to pass through to its shareholders a credit (or deduction, for a shareholder that itemizes deductions and so chooses) for foreign taxes (if any) borne with respect to foreign securities income earned by the Fund or the Portfolio. If the Fund so elects, shareholders will include in gross income from foreign sources their pro rata shares of such taxes, if any, treated as paid by the Fund. There can be no assurance that a Fund will make such election, even if it is eligible to do so. If a Fund does not qualify for or does not make such election, shareholders will not be entitled separately to claim a credit or deduction with respect to foreign taxes incurred by the Fund; in that case the foreign tax will nonetheless reduce the Fund's taxable income. Shareholders that are not subject to U.S. federal income tax, and those who invest in a Fund through tax-advantaged accounts (including those who invest through IRAs or other tax-advantaged retirement plans), generally will receive no benefit from any tax credit or deduction passed through by the Fund. Under certain circumstances, if a Fund receives a refund of foreign taxes paid in respect of a prior year, the value of Fund Shares could be affected or any foreign tax credits or deductions passed through to shareholders in respect of the Fund's foreign taxes for the current year could be reduced.

Certain of a Fund's or the Portfolio's investment practices, including derivative transactions and investments in debt obligations issued or purchased at a discount, will be subject to special and complex U.S. federal income tax provisions. These special rules may affect the timing, character, and/or amount of the Portfolio's or Fund's income or gains, and, in turn, a Fund's distributions to shareholders, and may require the Fund or the Portfolio to sell its investments at a time when it is not advantageous to do so.

In particular, the Hedged International Developed Equity Index Fund's transactions in respect of foreign currencies will potentially give rise to ordinary income and loss to the extent such income or loss results from fluctuations in the value of the foreign currency concerned. Such activities will potentially increase distributions to shareholders, including at the end of the year, accelerate distributions to shareholders, and increase the distributions taxed to shareholders as ordinary income. Moreover, any net losses arising from such activities will generally reduce and potentially require the recharacterization of prior ordinary income distributions, including in whole or in part as a return of capital. Any net ordinary losses so created cannot be carried forward by the Fund to offset income or gains earned in subsequent taxable years. The Hedged International Developed Equity Index Fund makes an election to treat currency gains and losses derived from certain eligible foreign currency forward contracts as capital gains and losses. It is possible that the Hedged International Developed Equity Index Fund will elect, on a prospective basis, to treat currency gains and losses derived from futures contracts or options as capital gains and losses; not all currency gains and losses derived from foreign currency contracts are eligible for this treatment.

Financial Intermediary Arrangements

Payments to Financial Intermediaries

Financial Highlights

The financial highlight tables are intended to help you understand each Fund's financial performance since each Fund's inception. Certain information reflects the performance results for a single Fund Share. The total returns in the table represent the rate that an investor would have earned (or lost) on an investment in each Fund (assuming reinvestment of all dividends and distributions). This information has been audited by Ernst & Young LLP, the Trust's independent registered public accounting firm, whose report, along with each Fund's financial highlights and financial statements, are included in each Fund's Form N-CSR filing, which is available upon request. Any references to Notes in these financial highlight tables refer to the “Notes to Financial Statements” section of each Fund's financial statements, and the financial information included in these tables should be read in conjunction with the financial statements incorporated by reference in the SAI. The Financial Highlights table is not presented for the State Street International Developed Equity Index Fund because that Fund has not commenced operations as of the date of this Prospectus.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET HEDGED INTERNATIONAL DEVELOPED EQUITY INDEX FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class K
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20 (a)
Net asset value, beginning of period	$109.35	$94.80	$121.55	$104.85	$104.30
Income (loss) from investment operations:
Net investment income (loss) (b)	3.52	3.11	3.25	2.93	2.15
Net realized and unrealized gain (loss)	11.46	15.56	(8.89 )	17.33	0.53
Total from investment operations	14.98	18.67	(5.64 )	20.26	2.68
Contribution from affiliates (Note 4)	0.00 (c)	—	—	—	—
Distributions to shareholders from:
Net investment income	(3.76 )	(4.12 )	(3.21 )	(3.56 )	(2.13 )
Net realized gains	—	—	(17.90 )	—	—
Total distributions	(3.76 )	(4.12 )	(21.11 )	(3.56 )	(2.13 )
Net asset value, end of period	$120.57	$109.35	$94.80	$121.55	$104.85
Total return (d)	13.69 %(e)	19.73 %	(4.78 )%	19.31 %	2.45 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$3,748,876	$3,056,806	$3,490,623	$4,512,062	$3,684,209
Ratios to Average Net Assets:
Total expenses	0.35 %	0.36 %	0.36 %	0.35 %	0.36 %
Net expenses	0.20 %	0.20 %	0.20 %	0.20 %	0.20 %
Net investment income (loss)	2.92 %	2.95 %	2.85 %	2.50 %	2.23 %
Portfolio turnover rate (f)	3 %	8 %	18 %	7 %	8 %

(a)	On April 17, 2020, the State Street Hedged International Developed Equity Index Fund underwent a 1-for-10 reverse share split. The historical per share activity presented here has been retroactively adjusted to reflect this split.
(b)	Net investment income per share is calculated using the average shares method.
(c)	Amount is less than $0.005 per share.
(d)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(e)	If an affiliate had not made a contribution during the year ended December 31, 2024, the total return would have remained 13.69%.
(f)	Portfolio turnover rate is from the corresponding affiliated Portfolio.

Index/Trademark Licenses/Disclaimers

THE FUNDS ARE NOT SPONSORED, ENDORSED, SOLD OR PROMOTED BY MSCI INC. (“MSCI”), ANY OF ITS AFFILIATES, ANY OF ITS INFORMATION PROVIDERS OR ANY OTHER THIRD PARTY INVOLVED IN, OR RELATED TO, COMPILING, COMPUTING OR CREATING ANY MSCI INDEX (COLLECTIVELY, THE “MSCI PARTIES”).THE MSCI INDICES ARE THE EXCLUSIVE PROPERTY OF MSCI. MSCI AND THE MSCI INDEX NAMES ARE SERVICE MARK(S) OF MSCI OR ITS AFFILIATES AND HAVE BEEN LICENSED FOR USE FOR CERTAIN PURPOSES BY THE LICENSEE. NONE OF THE MSCI PARTIES MAKES ANY REPRESENTATION OR WARRANTY, EXPRESS OR IMPLIED, TO THE ISSUER OR OWNERS OF THE MSCI FUNDS OR ANY OTHER PERSON OR ENTITY REGARDING THE ADVISABILITY OF INVESTING IN FUNDS GENERALLY OR IN THE MSCI FUNDS PARTICULARLY OR THE ABILITY OF ANY MSCI INDEX TO TRACK CORRESPONDING STOCK MARKET PERFORMANCE. MSCI OR ITS AFFILIATES ARE THE LICENSORS OF CERTAIN TRADEMARKS, SERVICE MARKS AND TRADE NAMES AND OF THE MSCI INDICES WHICH ARE DETERMINED, COMPOSED AND CALCULATED BY MSCI WITHOUT REGARD TO THE MSCI FUNDS OR THE ISSUER OR OWNERS OF THE MSCI FUNDS OR ANY OTHER PERSON OR ENTITY. NONE OF THE MSCI PARTIES HAS ANY OBLIGATION TO TAKE THE NEEDS OF THE ISSUER OR OWNERS OF THE MSCI FUNDS OR ANY OTHER PERSON OR ENTITY INTO CONSIDERATION IN DETERMINING, COMPOSING OR CALCULATING THE MSCI INDICES. NONE OF THE MSCI PARTIES IS RESPONSIBLE FOR OR HAS PARTICIPATED IN THE DETERMINATION OF THE TIMING OF, PRICES AT, OR QUANTITIES OF THE MSCI FUNDS TO BE ISSUED OR IN THE DETERMINATION OR CALCULATION OF THE EQUATION BY OR THE CONSIDERATION INTO WHICH THE MSCI FUNDS ARE REDEEMABLE. FURTHER, NONE OF THE MSCI PARTIES HAS ANY OBLIGATION OR LIABILITY TO THE ISSUER OR OWNERS OF THE MSCI FUNDS OR ANY OTHER PERSON OR ENTITY IN CONNECTION WITH THE ADMINISTRATION, MARKETING OR OFFERING OF THE MSCI FUNDS.

Contacting the State Street Funds

Online:	www.ssga.com	24 hours a day, 7 days a week
Phone:	(800) 647-7327	Monday – Friday 8:00 am – 6:00 pm EST

Written requests should be sent to:

Regular mail	Overnight/Registered, Express, Certified Mail
State Street Funds P.O. Box 219737 Kansas City, MO 64121-9737	State Street Funds 801 Pennsylvania Avenue, Suite 219737 Kansas City, MO 64105-1307

For more information about the Funds:

The Funds' SAI includes additional information about the Funds and is incorporated by reference into this document. Additional information about the Funds' investments is available in the Funds' most recent annual and semi-annual reports to shareholders and in each Fund's Form N-CSR filing. In a Fund's annual report, you will find a discussion of the market conditions and investment strategies that significantly affected the Fund's performance during its last fiscal year. In a Fund's Form N-CSR, you will find the Fund's annual and semi-annual financial statements. The Funds' SAI is available, without charge, upon request. The Funds' annual and semi-annual reports is available or will be available, without charge, upon request. Shareholders in the Funds may make inquiries to the Funds to receive such information by calling (800) 997-7327 or the customer service center at the telephone number shown in the accompanying contract prospectus, if applicable. Each Fund's Prospectus, SAI, annual and semi-annual reports to shareholders and other information such as each Fund's financial statements are available, free of charge, on the Funds' website at www.ssga.com.

SSGA Funds Management, Inc

ONE IRON STREET

BOSTON, MASSACHUSETTS 02210

SSITSTATPRO2The State Street Institutional Investment Trust's Investment Company Act File Number is 811-09819.

Prospectus

April 30, 2025

State Street Institutional
Investment Trust

State Street Institutional Liquid Reserves Government Money Market Fund

(formerly State Street Institutional Liquid Reserves Fund)

Trust Class (TILXX)

State Street Institutional Treasury Plus Money Market Fund

Trust Class (TPLXX)

State Street Institutional U.S. Government Money Market Fund

Trust Class (GVBXX)

The U.S. Securities and Exchange Commission has not approved or disapproved these securities or passed upon the adequacy of this Prospectus. Any representation to the contrary is a criminal offense.

An investment in any of the Funds offered by this Prospectus is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Each Fund may offer multiple classes of shares. This Prospectus covers only the Trust Class Shares of the applicable Funds.

TABLE OF CONTENTS

Fund Summaries	1
State Street Institutional Liquid Reserves Government Money Market Fund	1
State Street Institutional Treasury Plus Money Market Fund	7
State Street Institutional U.S. Government Money Market Fund	12
Additional Information About Investment Objectives, Principal Strategies and Risks	17
Additional Information About Non-Principal Investment Strategies and Risks	24
Portfolio Holdings Disclosure	26
Management and Organization	27
Shareholder Information	29
Dividends, Distributions and Tax Considerations	35
Financial Intermediary Arrangements	36
Financial Highlights	39

State Street Institutional Liquid Reserves Government Money Market Fund

Investment Objective

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Management Fee	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%
Other Expenses1	0.13%
Total Annual Fund Operating Expenses1	0.18%

“Other Expenses and ”Total Annual Fund Operating Expenses“ have been restated to reflect current fees.

Example:

1 year	3 years	5 years	10 years
$18	$58	$101	$230

Principal Investment Strategies

397 days but use maturity shortening provisions to meet the 397 day requirement, and that the Fund believes present minimal credit risk), to maintain a maximum dollar-weighted average maturity and dollar-weighted average life of sixty (60) days or less and 120 days or less, respectively, and to meet requirements as to portfolio diversification and liquidity. All securities held by the Fund are U.S. dollar-denominated, and they may have fixed, variable or floating interest rates.

The Fund attempts to meet its investment objective by investing in:

•

Repurchase agreements collateralized by U.S. government securities.

Principal Risks

Performance

The bar chart and table below provide some indication of the risks of investing in the ILR Government Fund by illustrating the variability of the Fund's returns for Trust Class Shares from year-to-year. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (877) 521-4083 or by visiting our website at www.ssga.com. Effective March 10, 2025, the ILR Government Fund converted to a government money market fund and adopted its current investment strategy. Prior to March 10, 2025, the ILR Government Fund operated as an institutional prime money market fund and invested in certain types of securities that the ILR Government Fund is no longer permitted to hold. Consequently, performance information for periods prior to March 10, 2025 would have been different had the ILR Government Fund's current investment strategy been in effect.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	1.39%	Q4 2023
Lowest Quarterly Return	-0.01%	Q4 2021

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Since Inception
	One Year	Five Years	8/29/2016
Trust Class	5.26 %	2.51 %	2.14 %

To obtain the Fund's current yield, please call (877) 521-4083.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

Purchase and Sale of Fund Shares

Trust Class shares of the Fund are only available for purchase by shareholders of the Fund who owned Trust Class shares on August 29, 2016.

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Trust Class
To establish an account	$15,000,000
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

You may purchase or redeem Fund Shares by written request or wire transfer. Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Telephone:

By Intermediary:

Financial Intermediaries may contact SS&C GIDS, Inc. at (877) 332-6207 or via email at nsccresearch@dstsystems.com with questions.

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

State Street Institutional Treasury Plus Money Market Fund

Investment Objective

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Management Fee	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%
Other Expenses	0.12%
Total Annual Fund Operating Expenses	0.17%

Example:

1 year	3 years	5 years	10 years
$17	$55	$96	$217

Principal Investment Strategies

Principal Risks

Performance

The bar chart and table below provide some indication of the risks of investing in the Treasury Plus Fund by illustrating the variability of the Fund's returns for Trust Class Shares from year-to-year. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (877) 521-4083 or by visiting our website at www.ssga.com.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	1.33%	Q4 2023
Lowest Quarterly Return	0.00%	Q3 2021

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Since Inception
	One Year	Five Years	8/29/2016
Trust Class	5.17 %	2.39 %	1.97 %

To obtain the Fund's current yield, please call (877) 521-4083.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

Purchase and Sale of Fund Shares

Trust Class shares of the Fund are only available for purchase by shareholders of the Fund who owned Trust Class shares on August 29, 2016.

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Trust Class
To establish an account	$15,000,000
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

You may purchase or redeem Fund Shares by written request or wire transfer. Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Telephone:

By Intermediary:

Financial Intermediaries may contact SS&C GIDS, Inc. at (877) 332-6207 or via email at nsccresearch@dstsystems.com with questions.

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

State Street Institutional U.S. Government Money Market Fund

Investment Objective

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Management Fee	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%
Other Expenses	0.02%
Total Annual Fund Operating Expenses	0.07%

Example:

1 year	3 years
$7	$23

Principal Investment Strategies

The Fund attempts to meet its investment objective by investing in:

•

Repurchase agreements collateralized by U.S. government securities.

Principal Risks

Performance

Performance information for the Fund has been omitted because Trust Class shares of the Fund have not commenced investment operations as of the date of this Prospectus. Once the Trust Class shares of the Fund have completed a full calendar year of operations, a bar chart and table will be included that will provide some indication of the risks of investing in the Fund by showing the variability of the Fund's returns based on net assets. The Fund will make updated performance information, including its current net asset value, available at the Fund's website: www.ssga.com.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

Purchase and Sale of Fund Shares

Trust Class shares of the Fund are only available for purchase by shareholders of the Fund who owned Trust Class shares of the State Street Institutional Liquid Reserves Government Money Market Fund as of the date of this Prospectus.

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Trust Class
To establish an account	$15,000,000
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

You may purchase or redeem Fund Shares by written request or wire transfer. Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Telephone:

By Intermediary:

Financial Intermediaries may contact SS&C GIDS, Inc. at (877) 332-6207 or via email at nsccresearch@dstsystems.com with questions.

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

Additional Information About Investment Objectives, Principal Strategies and Risks

Investment Objective

The investment objective of each of the ILR Government Fund, U.S. Government Fund and the Treasury Plus Fund, as stated in each Fund's Summary, may be changed without shareholder approval.

ILR Government Fund

Principal Investment Strategies

The Fund attempts to meet its investment objective by investing in:

•

Repurchase agreements collateralized by U.S. government securities.

Treasury Plus Fund

Principal Investment Strategies

The Treasury Plus Fund is a government money market fund and attempts to meet its investment objective by investing only in U.S. Treasury bills, notes and bonds (which are direct obligations of the U.S. government) and repurchase agreements collateralized by these obligations. The Fund will provide shareholders with at least sixty (60) days' prior notice of any change in this investment policy. The Fund may hold a portion of its assets in cash pending investment, to satisfy redemption requests or to meet the Fund's other cash management needs.

U.S. Government Fund

Principal Investment Strategies

The U.S. Government Fund is a government money market fund and invests only in obligations issued or guaranteed as to principal and/or interest, as applicable, by the U.S. government or its agencies and instrumentalities, as well as repurchase agreements secured by such instruments. The Fund will provide shareholders with at least sixty (60) days' prior notice of any change in this investment policy. The Fund may hold a portion of its assets in cash pending investment, to satisfy redemption requests or to meet the Fund's other cash management needs.

The Fund follows a disciplined investment process that attempts to provide stability of principal, liquidity and current income, by investing in U.S. government securities. Among other things, SSGA FM conducts its own credit analyses of potential investments and portfolio holdings, and relies substantially on a dedicated short-term credit research team. The Fund invests in accordance with regulatory requirements applicable to money market funds. Regulations require, among other things, a money market fund to invest only in short-term, high quality debt obligations (generally, securities that have remaining maturities of 397 calendar days or less, with the exception of certain floating rate securities that may have final maturities longer than 397 days but use maturity shortening provisions to meet the 397 day requirement, and that the Fund believes present minimal credit risk), to maintain a maximum dollar-weighted average maturity and dollar-weighted average life of sixty (60) days or less and 120 days or less, respectively, and to meet requirements as to portfolio diversification and liquidity. All securities held by the Fund are U.S. dollar-denominated, and they may have fixed, variable or floating interest rates.

The Fund attempts to meet its investment objective by investing in:

•

Repurchase agreements collateralized by U.S. government securities.

Additional Information About Risks

Counterparty Risk. A Fund will be subject to credit risk with respect to the counterparties with which a Fund enters into repurchase agreements and other transactions. If a counterparty fails to meet its contractual obligations, a Fund may be unable to terminate the transaction, and it may be delayed or prevented from realizing on any collateral in the event of a bankruptcy or insolvency proceeding relating to the counterparty.

Large Transactions Risk. To the extent a large proportion of the interests of a Portfolio or Fund are highly concentrated or held by a small number of investors (or a single investor), including funds or accounts over which the Adviser has investment discretion, a Fund is subject to the risk that these investors will purchase or redeem Portfolio or Fund interests in large amounts rapidly or unexpectedly, including as a result of an asset allocation decision made by the Adviser. In addition, a large number of shareholders collectively may purchase or redeem Portfolio or Fund shares in large amounts rapidly or unexpectedly (collectively, such transactions are referred to as “large shareholder transactions”). Large shareholder transactions could adversely affect the ability of a Fund to conduct its investment program. For example, they could require a Portfolio or Fund to sell portfolio securities or purchase portfolio securities unexpectedly and incur substantial transaction costs and/or accelerate the realization of taxable income and/or gains to investors. The effects of taxable income and/or gains resulting from large shareholder transactions would particularly impact non-redeeming shareholders who do not hold their Fund shares in an IRA, 401(k) plan or other tax-advantaged plan. To the extent that such transactions result in short-term capital gains, such gains will generally be taxed at the ordinary income tax rate for shareholders who hold Fund shares in a taxable account. In addition, a Portfolio or a Fund may be required to sell its more liquid portfolio investments to meet a large redemption, in which case a Fund's remaining assets may be less liquid, more volatile, and more difficult to price. A Portfolio or Fund may hold a relatively large proportion of its assets in cash in anticipation of large redemptions, diluting its investment returns. A number of circumstances may cause a Portfolio or a Fund to experience large redemptions, such as changes in investors' circumstances; changes in the eligibility criteria for a Portfolio or a Fund or share class of the Fund; liquidations, reorganizations, repositionings, or other announced Portfolio or Fund events; or changes in investment objectives, strategies, policies, risks, or investment personnel.

economies and markets, conditions in one country, market, or region might adversely affect markets, issuers, and/or foreign exchange rates in other countries, including the U.S. Any partial or complete dissolution of the Economic and Monetary Union of the European Union, or any increased uncertainty as to its status, could have significant adverse effects on currency and financial markets, and on the values of a Fund's investments. On January 31, 2020, the United Kingdom (“UK”) formally withdrew from the European Union (“EU”) (commonly known as “Brexit”). An agreement between the UK and the EU governing their future trade relationship became effective January 1, 2021, but that agreement does not include an agreement on financial services, and it is unlikely that such agreement will be concluded. Moreover, the UK government has started a program of financial services law reform with the ultimate aim of repealing many EU financial services laws that were assimilated into UK law from January 1, 2021, and replacing them with legislation or rules made by the UK government or financial services regulators. Accordingly, uncertainty remains in certain areas as to the future relationship between the UK and the EU. Brexit has already had a significant impact on the UK, Europe, and global economies, and could continue to result in volatility and illiquidity, legal, political, economic and regulatory uncertainties and lower economic growth for these economies that could in turn have an adverse effect on the value of the Fund's investments. Any further exits from the EU, or the possibility of such exits, or the abandonment of the euro, may cause additional market disruption globally and introduce new legal and regulatory uncertainties.

as investment adviser to the master fund, leading to potential conflicts of interest. For example, the Adviser or its affiliates will receive fees based on the amount of assets invested in the master fund. Investment by a Fund in the master fund may be beneficial in the management of the master fund, by helping to achieve economies of scale or enhancing cash flows. Due to this and other factors, the Adviser may have an incentive to invest a Fund's assets in a master fund sponsored or managed by the Adviser or its affiliates in lieu of investments by a Fund directly in portfolio securities, or may have an incentive to invest in such master fund over a master fund sponsored or managed by others. Similarly, the Adviser may have an incentive to delay or decide against the sale of interests held by a Fund in a master fund sponsored or managed by the Adviser or its affiliates. It is possible that other clients of the Adviser or its affiliates will purchase or sell interests in a master fund sponsored or managed by the Adviser or its affiliates at prices and at times more favorable than those at which a Fund does so. A Fund will bear its pro rata portion of the expenses incurred by the master fund.

mortgage-related or other asset-backed security. For some asset-backed securities in which a Fund invests, such as those backed by credit card receivables, the underlying cash flows may not be supported by a security interest in a related asset. Moreover, the values of mortgage-related and other asset-backed securities may be substantially dependent on the servicing of the underlying asset pools, and are therefore subject to risks associated with the negligence or malfeasance by their servicers and to the credit risk of their servicers. In certain situations, the mishandling of related documentation may also affect the rights of securities holders in and to the underlying collateral. There may be legal and practical limitations on the enforceability of any security interest granted with respect to underlying assets, or the value of the underlying assets, if any, may be insufficient if the issuer defaults.

Reinvestment Risk (principal risk for the ILR Government Fund and the U.S. Government Fund). Income from a Fund's portfolio may decline when the Fund invests the proceeds from investment income, sales of portfolio securities or matured, traded or called debt obligations. For instance, during periods of declining interest rates, an issuer of debt obligations may exercise an option to redeem securities prior to maturity, forcing a Fund to reinvest the proceeds in lower-yielding securities. A decline in income received by a Fund from its investments is likely to have a negative effect on the yield and total return of the Fund Shares.

Repurchase Agreement Risk. A repurchase agreement is an agreement to buy a security from a seller at one price and a simultaneous agreement to sell it back to the original seller at an agreed-upon price, typically representing the purchase price plus interest. Repurchase agreements may be viewed as loans made by a Fund which are collateralized by the securities subject to repurchase. A Fund's investment return on such transactions will depend on the counterparty's willingness and ability to perform its obligations under a repurchase agreement. If a Fund's counterparty should default on its obligations and a Fund is delayed or prevented from recovering the collateral, or if the value of the collateral is insufficient, a Fund may realize a loss.

Significant Exposure to U.S. Government Agencies or Instrumentalities Risk (principal risk for the ILR Government Fund and the U.S. Government Fund). To the extent a Fund focuses its investments in securities issued or guaranteed by U.S. government agencies or instrumentalities, any market movements, regulatory changes or changes in political or economic conditions that affect the U.S. government agencies or instrumentalities in which the Fund invests may have a significant impact on a Fund's performance. Events that would adversely affect the market prices of securities issued or guaranteed by one government agency or instrumentality may adversely affect the market price of securities issued or guaranteed by other government agencies or instrumentalities.

U.S. Government Securities Risk (principal risk for the ILR Government Fund and the U.S. Government Fund). U.S. government securities, such as Treasury bills, notes and bonds and mortgage-backed securities guaranteed by the Government National Mortgage Association (“Ginnie Mae”), are supported by the full faith and credit of the United States; others are supported by the right of the issuer to borrow from the U.S. Treasury; others are supported by the discretionary authority of the U.S. government to purchase the agency's obligations; and still others are supported only by the credit of the issuing agency, instrumentality, or enterprise. Although U.S. government-sponsored enterprises such as the Federal Home Loan Mortgage Corporation (“Freddie Mac”) and the Federal National Mortgage Association (“Fannie Mae”) may be chartered or sponsored by Congress, they are not funded by Congressional appropriations, and their securities are not issued by the U.S. Treasury nor supported by the full faith and credit of the U.S. government. There is no assurance that the U.S. government would provide financial support to its agencies and instrumentalities if not required to do so. In addition, certain governmental entities have been subject to regulatory scrutiny regarding their accounting policies and practices and other concerns that may result in legislation, changes in regulatory oversight and/or other consequences that could adversely affect the credit quality, availability, or investment character of securities issued by these entities. The value and liquidity of U.S. government securities may be affected adversely by changes in the ratings of those securities. Securities issued by the U.S. Treasury historically have been considered to present minimal credit risk.

The downgrade in the long-term U.S. credit rating by at least two major rating agencies has introduced greater uncertainty about the ability of the U.S. to repay its obligations. Further credit rating downgrades or a U.S. credit default could decrease the value and increase the volatility of a Fund's investments.

Variable and Floating Rate Securities Risk. Variable or floating rate securities are debt securities with variable or floating interest rates payments. Variable or floating rate securities bear rates of interest that are adjusted periodically according to formulae intended generally to reflect market rates of interest and allow a Fund to participate (determined in accordance with the terms of the securities) in increases in interest rates through upward adjustments of the coupon rates on the securities. However, during periods of increasing interest rates, changes in the coupon rates may lag behind the changes in market rates or may have limits on the maximum increases in coupon rates. Alternatively, during periods of declining interest rates, the coupon rates on such securities will typically readjust downward resulting in a lower yield. A Fund may also invest in variable or floating rate equity securities, whose dividend payments vary based on changes in market rates of interest or other factors.

Additional Information About Non-Principal Investment Strategies and Risks

Cybersecurity Risk. With the increased use of technologies such as the Internet and the dependence on computer systems to perform business and operational functions, funds (such as the Funds) and their service providers (including the Adviser) may be prone to operational and information security risks resulting from cyber-attacks and/or technological malfunctions. Furthermore, geopolitical tensions may have increased the scale and sophistication of deliberate cybersecurity attacks, particularly those from nation-states or from entities with nation-state backing. In general, cyber-attacks are deliberate, but unintentional events may have similar effects. Cyber-attacks include, among others, stealing or corrupting data maintained online or digitally, preventing legitimate users from accessing information or services on a website, releasing confidential information without authorization, and causing operational disruption. Successful cyber-attacks against, or security breakdowns of, a Fund, a Portfolio, the Adviser or a custodian, transfer agent, or other affiliated or third-party service provider may adversely affect a Fund or its shareholders. For instance, cyber-attacks or technical malfunctions may interfere with the processing of shareholder or other transactions, affect a Fund's ability to calculate its NAV, cause the release of private shareholder information or confidential Fund information, impede trading, cause reputational damage, and subject a Fund to regulatory fines, penalties or financial losses, reimbursement or other compensation costs, and additional compliance costs. Cyber-attacks or technical malfunctions may render records of Fund assets and transactions, shareholder ownership of Fund Shares, and other data integral to the functioning of a Fund inaccessible or inaccurate or incomplete. A Fund may also incur substantial costs for cybersecurity risk management in order to prevent cyber incidents in the future. A Fund and its shareholders could be negatively impacted as a result. While the Adviser has established business continuity plans and systems designed to minimize the risk of cyber-attacks through the use of technology, processes and controls, there are inherent limitations in such plans and systems, including the possibility that certain risks have not been identified, given the evolving nature of this threat. The use of artificial intelligence (“AI”) and machine learning could exacerbate these risks or result in cyber security incidents that implicate personal data. Each Fund relies on third-party service providers for many of its day-to-day operations, and will be subject to the risk that the protections and protocols implemented by those service providers will be ineffective to protect the Fund from cyber-attack. The Adviser does not control the cybersecurity plans and systems put in place by third-party service providers, and such third-party service providers may have limited indemnification obligations to the Adviser or the Funds. Similar types of cybersecurity risks or technical malfunctions also are present for issuers of securities in which each Fund invests, which could result in material adverse consequences for such issuers, and may cause a Fund's investment in such securities to lose value.

in the management of the pool, by helping to achieve economies of scale or enhancing cash flows. Due to this and other factors, the Adviser may have an incentive to invest a Fund's assets in a pool sponsored or managed by the Adviser or its affiliates in lieu of investments by the Fund directly in portfolio securities, or may have an incentive to invest in the pool over a pool sponsored or managed by others. Similarly, the Adviser may have an incentive to delay or decide against the sale of interests held by a Fund in a pool sponsored or managed by the Adviser or its affiliates. It is possible that other clients of the Adviser or its affiliates will purchase or sell interests in a pool sponsored or managed by the Adviser or its affiliates at prices and at times more favorable than those at which a Fund does so.

Trust Class Closure. The Trust Class of the ILR Government Fund, U.S. Government Fund, and the Treasury Plus Fund is currently closed to new investors, except as noted below.

Shareholders who owned Trust Class shares of the ILR Government Fund and the Treasury Plus Fund on August 29, 2016, and shareholders who owned Trust Class shares of the U.S. Government Fund as of the date of this Prospectus may continue to purchase shares of the class. Fund management may, in its discretion, reopen the share class to certain investors in the future. Each Fund reserves the right to modify this policy at any time.

Portfolio Holdings Disclosure

The Funds' portfolio holdings disclosure policy is described in the Statement of Additional Information (“SAI”).

Management and Organization

A Fund can withdraw its investment in a Portfolio if, at any time, the Fund's Board of Trustees (the “Board”) determines that it would be in the best interests of the Fund's shareholders, or if the investment objectives of the corresponding Portfolio changed so that they were inconsistent with the objectives of the Fund. If a Fund withdraws its investment from a Portfolio, the Fund may invest all of its assets in another mutual fund that has the same investment objective as the Fund, the Adviser may directly manage the Fund's assets, or the Board may take such other action it deems appropriate and in the best interests of shareholders of the Fund, which may include liquidation of the Fund.

Investment Adviser

Each Fund has entered into an investment advisory agreement with the Adviser pursuant to which the Adviser will manage the Fund's assets directly, for compensation paid at an annual rate of 0.05% of the Fund's average daily net assets, in the event that the Fund were to cease investing substantially all of its assets in its corresponding Portfolio or another investment company with essentially the same investment objectives and policies as the Fund. The Adviser does not receive any management fees from a Fund under that agreement so long as the Fund continues to invest substantially all of its assets in the corresponding Portfolio or in another investment company with essentially the same investment objectives and policies as the Fund. The Adviser places all orders for purchases and sales of the Portfolios' investments. Prior to March 10, 2025, the ILR Government Fund invested substantially all of its investable assets in State Street Money Market Portfolio. For the year ended December 31, 2024, the effective management fee paid, reflecting certain fee waivers and expense reimbursements of the Adviser, was 0.05% for State Street Money Market Portfolio, 0.05% for the U.S. Government Portfolio, and 0.05% for Treasury Plus Portfolio.

cretion (any such waiver or reimbursement of expenses being referred to herein as a “Voluntary Reduction”). Under an agreement with the Service Providers relating to the Voluntary Reduction, the Funds and the Portfolios have agreed to reimburse the Service Providers for the full dollar amount of any Voluntary Reduction beginning on May 1, 2020, subject to certain limitations. Each Service Provider may, in its sole discretion, irrevocably waive receipt of any or all reimbursement amounts due from a Fund.

A discussion regarding the Board's consideration of the Funds' Investment Advisory Agreement is provided in the Funds' Form N-CSR filing with the SEC for the period ended June 30, 2024.

The Administrator, Sub-Administrator and Custodian

The Adviser serves as administrator of each Fund. The amount of the fee paid to the Adviser for administrative services may vary by share class. Each Fund currently pays the Adviser an administrative fee at the annual rate of 0.05% in respect of the class of shares in this Prospectus. State Street Bank and Trust Company (“State Street”), a subsidiary of State Street Corporation, serves as the sub-administrator for the Funds for a fee that is paid by the Adviser. State Street also serves as custodian of the Funds for a separate fee that is paid by the Funds. SSGA FM serves as administrator of the Portfolios and State Street serves as sub-administrator and custodian of the Portfolios.

The Transfer Agent and Dividend Disbursing Agent

SS&C GIDS, Inc. is the Funds' transfer agent and dividend disbursing agent (the “Transfer Agent”).

The Distributor

State Street Global Advisors Funds Distributors, LLC serves as the Funds' distributor (“SSGA FD”) pursuant to the Distribution Agreement between SSGA FD and the Trust.

The Shareholder Servicing Agent

Additional Information

Shareholder Information

Determination of Net Asset Value

For all Funds

The Treasury Plus Fund, the U.S. Government Fund and the ILR Government Fund each determines its NAV per share once each Business Day (as defined below), typically at 5:00 p.m. ET (the time when a Fund determines its NAV per share is referred to herein as the “Valuation Time”). The Funds reserve the right to advance the time for accepting purchase or redemption orders and/or the Valuation Time on any day when the NYSE, bond markets (as recommended by The Securities Industry and Financial Markets Association (“SIFMA”)) or any Federal Reserve bank close early, trading on the NYSE is restricted, an emergency arises or as otherwise permitted by the SEC. The Funds reserve the right to continue to accept orders to purchase or redeem shares following the close of the NYSE on any day on which the NYSE closes early, provided that either the Federal Reserve or the bond markets remain open. In addition, the Board may, for any Business Day, decide to change the time as of which a Fund's NAV is calculated in response to new developments such as altered trading hours, or as otherwise permitted by the SEC.

Investing in State Street Institutional Investment Trust Shares

Street Funds will be processed when they are received in “good order.” “Good order” means that the request is in an accurate and complete form, and all applicable documents have been received in such accurate and complete form (including, typically, a signed application and medallion-guaranteed documents), and, for a purchase request, the check or wired funds have cleared.

Purchasing Shares

Subject to the restrictions described above under “Trust Class Closure,” investors pay no sales load to invest in the Trust Class Shares of the Fund. The price for Fund Shares is the NAV per share. Purchase requests received by a Fund in good order (a purchase request is in good order if it meets the requirements implemented from time to time by the Transfer Agent or authorized agent of the Fund, and for new accounts includes submission of a completed and signed application and all documentation necessary to open an account) on a Business Day will, if payment is received by FedWire, be priced at the NAV next determined after the order is accepted by the Fund. Payments received by FedWire prior to the last Valuation Times will earn dividend accrual for that purchase.

The minimum initial investment in Trust Class at the time the Funds closed to new investors was $15 million, although the Adviser may waive the minimum in its discretion. Holdings of related customer accounts may be aggregated for purposes of determining the minimum investment amount. “Related customer accounts” may include, but are not limited to, accounts held by the same investment or retirement plan, financial institution, broker, dealer or intermediary. The Funds and the Adviser reserve the right to increase or decrease the minimum amount required to open or maintain an account. There is no minimum subsequent investment, except in relation to maintaining certain minimum account balances (See “Redeeming Shares” below).The Funds require prior notification of subsequent investments in excess of $50 million. The Funds reserve the right to cease accepting investments at any time or to reject any investment order. Each Fund may limit the amount of a purchase order received after 3:00 p.m. ET.

How to Purchase Shares

Please see “Trust Class Closure” above regarding restrictions on purchasing shares of the Trust Class.

By Mail:

An initial investment in the Funds must be preceded or accompanied by a completed, signed Institutional Account

Application Form, sent to:

State Street Funds

P.O. Box 219737

Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds

801 Pennsylvania Avenue, Suite 219737

Kansas City, MO 64105-1307

By Telephone/Fax:

An initial investment in the Funds must be preceded or accompanied by a completed, signed Institutional Account

Application Form, faxed to (816) 218-0400. Call the Fund at (866) 392-0869 between the hours of 8:00 a.m. ET

and 6:00 p.m. ET to:

➢ confirm receipt of the faxed Institutional Account Application Form (initial purchases only),

➢ request your new account number (initial purchases only),

➢ confirm the amount being wired and wiring bank, and

➢ receive a confirmation number for your purchase order (your trade is not effective until you have received a

confirmation number from the Fund).

For your initial investment, send the original, signed Institutional Account Application Form to the address above.

Wire Instructions:

Instruct your bank to transfer money by Federal Funds wire to:

State Street Bank and Trust Company

1 Iron Street

Boston, MA 02210

ABA# 011000028

DDA# 9904-631-0

State Street Institutional Investment Trust

Fund Name

Class Name

Account Number

Account Registration

On Columbus Day and Veterans Day, you will not be able to purchase shares by wiring Federal Funds because the

Federal Funds wiring does not occur on those days. Payment for Fund Shares must be in Federal Funds (or

converted to Federal Funds by the Transfer Agent) by the close of the Federal Reserve.

The Funds and the Funds' agents are not responsible for transfer errors by the sending or receiving bank and will

not be liable for any loss incurred due to a wire transfer not having been received.

Redeeming Shares

An investor may redeem all or any portion of its investment. Redemption orders are processed at the NAV next determined after a Fund receives a redemption order in good form.

If the Treasury Plus Fund, the U.S. Government Fund or the ILR Government Fund receives a redemption order in good form prior to 5:00 p.m. ET on a Business Day, the Fund typically expects to pay out redemption proceeds on that day, but no later than the next Business Day if redemption proceeds are sent by wire or ACH.

If redemption proceeds are sent by check, the Fund pays out redemption proceeds on the next Business Day. If a full redemption order is requested, no dividends will accrue with respect to shares on the day the redemption proceeds are sent. If a redemption order is placed after 5:00 p.m. ET, the Fund typically expects to pay out redemption proceeds on the next Business Day (and dividends will accrue up to, but not including, the day that redemption proceeds are sent), but no later than the following Business Day. The Fund may postpone and/or suspend redemption and payment beyond the foregoing time periods only as follows:

For any period during which there is a non-routine closure of the Fedwire or applicable Federal Reserve Banks;

For any period (1) during which the NYSE is closed other than customary week-end and holiday closings or (2) during which trading on the NYSE is restricted;

For any period during which the SEC has, by rule or regulation, deemed that (1) trading shall be restricted or (2) an emergency exists;

For any period that the SEC, may by order permit for your protection; or

A Fund may pay all or a portion of your redemption proceeds by giving you securities (for example, if the Fund reasonably believes that a cash redemption may have a substantial impact on the Fund and its remaining shareholders). A redemption is generally a taxable event for shareholders, regardless of whether the redemption is satisfied in cash or in kind. You may pay transaction costs and/or taxes to dispose of the securities, and you may receive less for them than the price at which they were valued for purposes of the redemption. In addition, you will be subject to the market risks associated with such securities until such time as you choose to dispose of the security.

How to Redeem Shares


By Mail:	Send a signed letter to: State Street Institutional Investment Trust Funds P.O. Box 219737 Kansas City, MO 64121-9737
	The letter should include information necessary to process your request as described below. The Fund may require a medallion guarantee in certain circumstances. See “Medallion Guarantees” below.
By Overnight:	State Street Institutional Investment Trust Funds 801 Pennsylvania Avenue, Suite 219737 Kansas City, MO 64105-1307
By Telephone:	Please call (866) 392-0869 between the hours of 8:00 a.m. and 6:00 p.m. ET.
The Funds will need the following information to process your redemption request:
➢ name(s) of account owners; ➢ account number(s); ➢ the name of the Fund; ➢ your daytime telephone number; and ➢ the dollar amount or number of shares being redeemed.

On any day that the Funds calculate their NAVs earlier than normal, the Funds reserve the right to adjust the times noted above for purchasing and redeeming shares.

Medallion Guarantees. Certain redemption requests must include a medallion guarantee for each registered account owner if any of the following apply:

•

Your account address has changed within the last 10 Business Days.

•

Redemption proceeds are being transferred to an account with a different registration.

•

A wire is being sent to a financial institution other than the one that has been established on your Fund account.

•

Other unusual situations as determined by the Transfer Agent.

The Funds may terminate the receipt of redemption orders by telephone at any time, in which case you may redeem shares by other means.

If you choose to purchase or redeem shares by sending instructions by regular mail, they will not be deemed received in good order until they are released by the post office and redelivered to the Transfer Agent's physical location at 801 Pennsylvania Avenue, Suite 219737 in Kansas City, MO 64105-1307. There will be a time lag, which may be one or more days, between regular mail receipt at the post office box and redelivery to such physical location in Kansas City, and a Fund's NAV may change over those days. You might consider using express rather than regular mail if you believe the time of receipt of your transaction request to be sensitive.

Exchanging Shares

An exchange occurs when you use the proceeds from the redemption of shares of a Fund in the State Street Institutional Investment Trust to simultaneously purchase shares of a different Fund in the State Street Institutional Investment Trust. Exchanges may be made between different Funds within the same class (i.e., Trust Class shares for Trust Class shares). The account holding the original shares must be registered in the same name as the account holding the new shares received in the exchange. You may make exchange requests by telephone, or by mail. See Purchasing Shares and Redeeming Shares. Exchanges are subject to the terms applicable to the purchases of the fund into which you are exchanging. Exchange privileges may not be available for mutual funds advised by SSGA FM (the “State Street Funds”) and may be suspended or rejected.

Excessive Trading

Delivery of Documents to Accounts Sharing an Address

To reduce expenses, we may mail only one copy of the Funds' Prospectus and each annual and semi-annual report to those addresses shared by two or more accounts. If you wish to receive individual copies of these documents, please call us at (866) 392-0869, or contact your financial institution. We will begin sending you individual copies thirty (30) days after receiving your request.

Unclaimed Property

Many states have unclaimed property rules that provide for transfer to the state (also known as “escheatment”) of unclaimed property under various circumstances. These circumstances include inactivity (e.g., no owner-initiated contact for a certain period), returned mail (e.g., when mail sent to a shareholder is returned by the post office as undeliverable), or a combination of both inactivity and returned mail. If a State Street Fund identifies property as unclaimed, it will attempt to contact the shareholder, but if that attempt is unsuccessful, the account may be considered abandoned and escheated to the state after the passage of a certain period of time (as required by applicable state law).

sentative, after receiving an escheatment notification regarding your account, communicates knowledge of your location and confirms that you have not abandoned your account. You can mail a completed designation form to the Fund (if you hold shares directly with the Fund) or to your financial intermediary (if you do not hold shares directly with the Fund).

Dividends, Distributions and Tax Considerations

Each Fund invests substantially all of its investable assets in a corresponding Portfolio that is treated as a partnership for U.S. federal income tax purposes. The nature and character of each Fund's income, gains, losses and deductions generally will be determined at the Portfolio level, and each Fund will be allocated its share of the corresponding Portfolio's income, gains, losses and deductions. As applicable, references in this discussion to income, gains and losses of a Fund will be to income, gains and losses recognized and deductions accruing at the Portfolio level and allocated to or otherwise taken into account by the Fund, and references to assets of a Fund will be to the Fund's allocable share of the assets of the corresponding Portfolio.

When the NAV of Fund Shares varies from a shareholder's tax basis in such shares, including when the NAV of such Fund Shares varies from $1.0000 per share, the shareholder generally will realize a gain or loss upon the redemption or other taxable disposition of such Fund Shares. Any such gain generally would be taxable to you as either short-term or long-term capital gain, depending upon how long you held the Fund Shares. The Internal Revenue Service (the “IRS”) has issued final regulations and published guidance that permit a simplified method of accounting for gains and losses realized upon the disposition of money market fund shares. Shareholders should see the SAI for further information.

An additional 3.8% Medicare contribution tax is imposed on the “net investment income” of individuals, estates and trusts to the extent their income exceeds certain threshold amounts. Net investment income generally includes for this purpose dividends paid by a Fund and net gains recognized on the redemption (or other taxable disposition) of Fund Shares.

Financial Intermediary Arrangements

Payments to Financial Intermediaries

Third-Party Transactions. The State Street Funds have authorized certain Financial Intermediaries to accept purchase, redemption and exchange orders on the State Street Funds' behalf. Orders received for a State Street Fund by a Financial Intermediary that has been authorized to accept orders on the Fund's behalf (or other Financial Intermediaries designated by the Financial Intermediary) will be deemed accepted by the Fund at the time they are received by the Financial Intermediary and will be priced based on the Fund's next NAV determination as long as the Financial Intermediary transmits the order in good form and in a timely manner to the applicable State Street Fund(s). The Financial Intermediary is responsible for transmitting your orders and associated funds in good form and in a timely manner to the applicable State Street Fund(s). The State Street Funds will not be responsible for delays by the Financial Intermediary in transmitting your orders, including timely transfer of payment, to a Fund.

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Financial Highlights

The financial highlight tables are intended to help you understand the financial performance of ILR Government Fund and Treasury Plus Fund since the inception date of the Trust Class shares. Certain information reflects the performance results for a single Fund Share. The total returns in the table represent the rate that an investor would have earned (or lost) on an investment in each Fund (assuming reinvestment of all dividends and distributions). This information has been audited by Ernst & Young LLP, the Trust's independent registered public accounting firm, whose report, along with each Fund's financial highlights and financial statements, are included in each Fund's Form N-CSR filing, which is available upon request. Any references to Notes in these financial highlight tables refer to the “Notes to Financial Statements” section of each Fund's financial statements, and the financial information included in these tables should be read in conjunction with the financial statements incorporated by reference in the SAI. The Trust Class shares of the U.S. Government Fund had not commenced operations prior to the date of this Prospectus and therefore do not have financial information. Once the Trust Class shares of the U.S. Government Fund has completed a full calendar year of operations, financial highlight tables will be provided.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL LIQUID RESERVES GOVERNMENT MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Trust Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$1.0006	$1.0004	$1.0001	$1.0002	$1.0001
Income (loss) from investment operations:
Net investment income (loss)	0.0516	0.0509	0.0164	0.0001	0.0052
Net realized and unrealized gain (loss)	(0.0002 )	0.0002	0.0003	(0.0001 )	0.0001
Total from investment operations	0.0514	0.0511	0.0167	—	0.0053
Distributions to shareholders from:
Net investment income	(0.0516 )	(0.0509 )	(0.0164 )	(0.0001 )	(0.0052 )
Net asset value, end of period	$1.0004	$1.0006	$1.0004	$1.0001	$1.0002
Total return (b)	5.26 %	5.23 %	1.68 %	(0.00 )%(c)	0.53 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$418,728	$433,129	$500,902	$413,169	$452,418
Ratios to Average Net Assets:
Total expenses	0.17 %	0.17 %	0.18 %	0.18 %	0.18 %
Net expenses	0.17 %	0.17 %	0.18 %	0.17 %	0.18 %
Net investment income (loss)	5.17 %	5.08 %	1.56 %	0.01 %	0.51 %

(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.
(b)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(c)	Amount is less than 0.005%.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL TREASURY PLUS MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Trust Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Income (loss) from investment operations:
Net investment income (loss)	0.0505	0.0489	0.0155	0.0001	0.0036
Net realized gain (loss)	(0.0000 )(b)	0.0000 (b)	—	—	—
Total from investment operations	0.0505	0.0489	0.0155	0.0001	0.0036
Distributions to shareholders from:
Net investment income	(0.0505 )	(0.0489 )	(0.0155 )	(0.0001 )	(0.0036 )
Net asset value, end of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Total return (c)	5.17 %	5.00 %	1.56 %	0.01 %	0.36 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$2,246,653	$1,942,328	$3,765,775	$3,566,204	$4,609,983
Ratios to Average Net Assets:
Total expenses	0.17 %	0.17 %	0.17 %	0.17 %	0.18 %
Net expenses	0.17 %	0.17 %	0.16 %	0.07 %	0.16 %
Net investment income (loss)	5.04 %	4.81 %	1.61 %	0.01 %	0.33 %

(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.

Contacting the State Street Funds

Online:	www.ssga.com	24 hours a day, 7 days a week
Phone:	(877) 521-4083	Monday – Friday 8:00 am – 6:00 pm EST

Written requests should be sent to:

Regular mail	Overnight/Registered, Express, Certified Mail
State Street Funds P.O. Box 219737 Kansas City, MO 64121-9737	State Street Funds 801 Pennsylvania Avenue, Suite 219737 Kansas City, MO 64105-1307

For more information about the Funds:

The Funds' SAI includes additional information about the Funds and is incorporated by reference into this document. Additional information about the Funds' investments is available in the Funds' most recent annual and semi-annual reports to shareholders and in each Fund's Form N-CSR filing. In a Fund's Form N-CSR, you will find the Fund's annual and semi-annual financial statements. The Funds' SAI is available, without charge, upon request. The Funds' annual and semi-annual reports are available, without charge, upon request. Shareholders in the Funds may make inquiries to the Funds to receive such information by calling (877) 521-4083 or the customer service center at the telephone number shown in the accompanying contract prospectus, if applicable. Each Fund's Prospectus, SAI, annual and semi-annual reports to shareholders and other information such as each Fund's financial statements are available, free of charge, on the Funds' website at www.ssga.com.

SSGA Funds Management, Inc

ONE IRON STREET

BOSTON, MASSACHUSETTS 02210

ILRTRCLSTATPROThe State Street Institutional Investment Trust's Investment Company Act File Number is 811-09819.

Prospectus

April 30, 2025

State Street Institutional
Investment Trust

State Street Institutional U.S. Government Money Market Fund: Administration Class (SALXX)

The U.S. Securities and Exchange Commission has not approved or disapproved these securities or passed upon the adequacy of this Prospectus. Any representation to the contrary is a criminal offense.

An investment in the Fund offered by this Prospectus is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

The Fund offers multiple classes of shares. This Prospectus covers only the Administration Class Shares.

TABLE OF CONTENTS

Fund Summary	1
State Street Institutional U.S. Government Money Market Fund	1
Additional Information About Investment Objective, Principal Strategies and Risks	7
Additional Information About Non-Principal Investment Strategies and Risks	13
Portfolio Holdings Disclosure	15
Management and Organization	16
Shareholder Information	18
Dividends, Distributions and Tax Considerations	24
Financial Intermediary Arrangements	25
Financial Highlights	27

State Street Institutional U.S. Government Money Market Fund

Investment Objective

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Management Fee	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.05%
Other Expenses	0.26%
Total Annual Fund Operating Expenses	0.36%

Example:

1 year	3 years	5 years	10 years
$37	$116	$202	$456

Principal Investment Strategies

The Fund attempts to meet its investment objective by investing in:

•

Repurchase agreements collateralized by U.S. government securities.

Principal Risks

Performance

The bar chart and table below provide some indication of the risks of investing in the U.S. Government Fund by illustrating the variability of the Fund's returns for Administration Class shares from year-to-year. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (877) 521-4083 or by visiting our website at www.ssga.com.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	1.28%	Q4 2023
Lowest Quarterly Return	0.00%	Q3 2020

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Since Inception
	One Year	Five Years	8/23/2016
Administration Class	4.97 %	2.26 %	1.82 %

To obtain the Fund's current yield, please call (877) 521-4083.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Administration Class
To establish an account	$1,000
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

You may purchase or redeem Fund Shares by written request or wire transfer. Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Telephone:

By Intermediary:

Financial Intermediaries may contact SS&C GIDS, Inc. at (877) 332-6207 or via email at nsccresearch@dstsystems.com with questions.

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

Additional Information About Investment Objective, Principal Strategies and Risks

Investment Objective

The investment objective of the U.S. Government Fund, as stated in the Fund Summary, may be changed without shareholder approval.

U.S. Government Fund

Principal Investment Strategies

The U.S. Government Fund is a government money market fund and invests only in obligations issued or guaranteed as to principal and/or interest, as applicable, by the U.S. government or its agencies and instrumentalities, as well as repurchase agreements secured by such instruments. The Fund will provide shareholders with at least sixty (60) days' prior notice of any change in this investment policy. The Fund may hold a portion of its assets in cash pending investment, to satisfy redemption requests or to meet the Fund's other cash management needs.

The Fund follows a disciplined investment process that attempts to provide stability of principal, liquidity and current income, by investing in U.S. government securities. Among other things, SSGA FM conducts its own credit analyses of potential investments and portfolio holdings, and relies substantially on a dedicated short-term credit research team. The Fund invests in accordance with regulatory requirements applicable to money market funds. Regulations require, among other things, a money market fund to invest only in short-term, high quality debt obligations (generally, securities that have remaining maturities of 397 calendar days or less, with the exception of certain floating rate securities that may have final maturities longer than 397 days but use maturity shortening provisions to meet the 397 day requirement, and that the Fund believes present minimal credit risk), to maintain a maximum dollar-weighted average maturity and dollar-weighted average life of sixty (60) days or less and 120 days or less, respectively, and to meet requirements as to portfolio diversification and liquidity. All securities held by the Fund are U.S. dollar-denominated, and they may have fixed, variable or floating interest rates.

The Fund attempts to meet its investment objective by investing in:

•

Repurchase agreements collateralized by U.S. government securities.

Additional Information About Risks

The Fund is subject to the following principal risks. The risks are described in alphabetical order and not in the order of importance or potential exposure.

The credit rating assigned to any particular investment does not necessarily reflect the issuer's current financial condition and does not reflect an assessment of an investment's volatility or liquidity. Securities rated in the lowest category of investment-grade are considered to have speculative characteristics. If a security held by the Fund loses its rating or its rating is downgraded, the Fund may nonetheless continue to hold the security in the discretion of the Adviser. In the case of asset-backed or mortgage-related securities, changes in the actual or perceived ability of the obligors on the underlying assets or mortgages to make payments of interest and/or principal may affect the values of those securities.

Debt Securities Risk. The values of debt securities may increase or decrease as a result of the following: market fluctuations, changes in interest rates, actual or perceived inability or unwillingness of issuers, guarantors or liquidity providers to make scheduled principal or interest payments or illiquidity in debt securities markets. To the extent that interest rates rise, certain underlying obligations may be paid off substantially slower than originally anticipated and the value of those securities may fall sharply. A rising interest rate environment may cause the value of the Fund's fixed income securities to decrease, an adverse impact on the liquidity of the Fund's fixed income securities, and increased volatility of the fixed income markets. During periods when interest rates are at low levels, the Fund's yield can be low, and the Fund may have a negative yield (i.e., it may lose money on an operating basis). To the extent that interest rates fall, certain underlying obligations may be paid off substantially faster than originally anticipated. If the principal on a debt obligation is prepaid before expected, the prepayments of principal may have to be reinvested in obligations paying interest at lower rates. During periods of falling interest rates, the income received by the Fund may decline. Changes in interest rates will likely have a greater effect on the values of debt securities of longer durations. Returns on investments in debt securities could trail the returns on other investment options, including investments in equity securities. High levels of inflation and/or a significantly changing interest rate environment can lead to heightened levels of volatility and reduced liquidity.

Securities and financial markets may be susceptible to market manipulation or other fraudulent trade practices, which could disrupt the orderly functioning of these markets or adversely affect the values of investments traded in these markets, including investments held by the Fund. To the extent the Fund has focused its investments in the market or index of a particular region, adverse geopolitical and other events could have a disproportionate impact on the Fund.

Market Risk. Market prices of investments held by the Fund will go up or down, sometimes rapidly or unpredictably. The Fund's investments are subject to changes in general economic conditions, general market fluctuations and the risks inherent in investment in securities markets. Investment markets can be volatile, and prices of investments can change substantially due to various factors, including, but not limited to, economic growth or recession, changes in interest rates, inflation, changes in actual or perceived creditworthiness of issuers and general market liquidity. Even if general economic conditions do not change, the value of an investment in the Fund could decline if the particular industries, sectors or companies in which the Fund invests do not perform well or are adversely affected by events. Further, legal, political, regulatory and tax changes also may cause fluctuations in markets and securities prices. Local, regional or global events such as war, military conflicts, acts of terrorism, trade policy changes or disputes, the threat of or actual imposition of tariffs, natural disasters, public health issues, or other events could have a significant impact on the Fund and its investments. Due to the interconnectedness of economies and financial markets throughout the world, if a Fund invests in securities of issuers located in or with significant exposure to countries experiencing economic and financial difficulties, the value and liquidity of the Fund's investments may be negatively affected. A widespread outbreak of an infectious illness and efforts to contain its spread, may result in market volatility, inflation, reduced liquidity of certain instruments, disruption in the trading of certain instruments, and systemic economic weakness. The foregoing could impact the Fund and its investments and result in disruptions to the services provided to the Fund by its service providers.

Market Volatility; Government Intervention Risk. Market dislocations and other external events, such as the failures or near failures of significant financial institutions, dislocations in investment or currency markets, corporate or governmental defaults or credit downgrades, or poor collateral performance, may subject the Fund to significant risk of substantial volatility and loss. Governmental and regulatory authorities have taken, and may in the future take, actions to provide or arrange credit supports to financial institutions whose operations have been compromised by credit market dislocations and to restore liquidity and stability to financial systems in their jurisdictions; the implementation of such governmental interventions and their impact on both the markets generally and the Fund's investment program in particular can be uncertain. Governmental and non-governmental issuers may default on, or be forced to restructure, their debts, and other issuers may face difficulties obtaining credit. Defaults or restructurings by governments or others of their debts could have substantial adverse effects on economies, financial markets, and asset valuations around the world. Federal Reserve or other U.S. or non-U.S. governmental or central bank actions, including interest rate increases or contrary actions by different governments, or investor perception that these efforts are not succeeding, could negatively affect financial markets generally as well as the values and liquidity of certain securities.

Money Market Fund Regulatory Risk. Money market funds and the securities they invest in are subject to comprehensive regulations. The SEC has adopted amendments to money market fund regulation that, among other things, increase the daily and weekly liquid asset requirements (“Money Market Fund Reform”). Money Market Fund Reform permits government money market funds (such as the Fund), that are experiencing a negative gross yield as a result of negative interest rates, to either convert from a stable share price to a floating share price or reduce the number of shares outstanding to maintain a stable net asset value per share, subject to certain Board determinations and disclosures to investors. The SEC and other government agencies continue to review the regulation of money market funds and may implement additional regulatory changes in the future. The enactment of any new legislation or regulations impacting the money market fund industry could limit the Fund's investment flexibility and reduce its ability to generate returns.

Money Market Fund Risk. An investment in a money market fund is not a deposit of any bank and is not insured or guaranteed by the FDIC or any other government agency. Although a money market fund generally seeks to preserve the value of its shares at $1.00 per share, there can be no assurance that it will do so, and it is possible to lose money by investing in a money market fund. A major or unexpected change in interest rates or a decline in the credit quality of an issuer or entity providing credit support, an inactive trading market for money market instruments, or adverse market, economic, industry, political, regulatory, geopolitical, and other conditions could cause a money market fund's share price to fall below $1.00. It is possible that a money market fund will issue and redeem shares at $1.00 per share at times when the fair value of the money market fund's portfolio per share is more or less than $1.00. Rule 2a-7 as adopted by the SEC permits a money market fund to impose a liquidity fee upon the sale of fund shares under certain circumstances, however the U.S. Government Fund is a government money market fund that has not elected to be subject to the liquidity fee provision of Rule 2a-7. None of State Street Corporation, State Street, State Street Global Advisors, SSGA FM or their affiliates (collectively, the “State Street Entities”) guarantee the value of an investment in a money market fund at $1.00 per share. Investors should have no expectation of capital support to a money market fund from the State Street Entities.

Mortgage-Related and Other Asset-Backed Securities Risk. Investments in mortgage-related and other asset-backed securities are subject to the risk of significant credit downgrades, illiquidity, and defaults to a greater extent than many other types of fixed income investments. The liquidity of mortgage-related and asset-backed securities may change over time. Mortgage-related securities represent a participation in, or are secured by, mortgage loans. Other asset-backed securities are typically structured like mortgage-related securities, but instead of mortgage loans or interests in mortgage loans, the underlying assets may include, for example, items such as motor vehicle installment sales or installment loan contracts, leases on various types of real and personal property, and receivables from credit card agreements. During periods of falling interest rates, mortgage-related and other asset-backed securities, which typically provide the issuer with the right to prepay the security prior to maturity, may be prepaid, which may result in the Fund having to reinvest the proceeds in other investments at lower interest rates. During periods of rising interest rates, the average life of mortgage-related and other asset-backed securities may extend because of slower-than expected principal payments. This may lock in a below market interest rate, increase the security's duration and interest rate sensitivity, and reduce the value of the security. As a result, mortgage-related and other asset-backed securities may have less potential for capital appreciation during periods of declining interest rates than other debt securities of comparable maturities, although they may have a similar risk of decline in market values during periods of rising interest rates. Prepayment rates are difficult to predict and the potential impact of prepayments on the value of a mortgage-related or other asset-backed security depends on the terms of the instrument and can result in significant volatility. The price of a mortgage-related or other asset-backed security also depends on the credit quality and adequacy of the underlying assets or collateral. Mortgage-related or other asset-backed securities issued by non-governmental issuers (such as commercial banks, savings and loan institutions, private mortgage insurance companies, mortgage bankers and other secondary market issuers) will generally entail greater credit risk than obligations guaranteed by the U.S. government. Defaults on the underlying assets, if any, may impair the value of a mortgage-related or other asset-backed security. For some asset-backed securities in which the Fund invests, such as those backed by credit card receivables, the underlying cash flows may not be supported by a security interest in a related asset. Moreover, the values of mortgage-related and other asset-backed securities may be substantially dependent on the servicing of the underlying asset pools, and are therefore subject to risks associated with the negligence or malfeasance by their servicers and to the credit risk of their servicers. In certain situations, the mishandling of related documentation may also affect the rights of securities holders in and to the underlying collateral. There may be legal and practical limitations on the enforceability of any security interest granted with respect to underlying assets, or the value of the underlying assets, if any, may be insufficient if the issuer defaults.

Additional Information About Non-Principal Investment Strategies and Risks

The Adviser and its affiliates serve as investment adviser to other clients and may make investment decisions that may be different from those that will be made by the Adviser on behalf of the Fund. For example, the Adviser may provide asset allocation advice to some clients that may include a recommendation to invest in or redeem from particular issuers while not providing that same recommendation to all clients invested in the same or similar issuers. The Adviser may (subject to applicable law) be simultaneously seeking to purchase (or sell) investments for the Fund and to sell (or purchase) the same investment for accounts, funds, or structured products for which it serves as asset manager, or for other clients or affiliates. The Adviser and its affiliates may invest for clients in various securities that are senior, pari passu or junior to, or have interests different from or adverse to, the securities that are owned by the Fund. The Adviser or its affiliates, in connection with its other business activities, may acquire material nonpublic confidential information that may restrict the Adviser from purchasing securities or selling securities for itself or its clients (including the Fund) or otherwise using such information for the benefit of its clients or itself.

Cybersecurity Risk. With the increased use of technologies such as the Internet and the dependence on computer systems to perform business and operational functions, funds (such as the Fund) and their service providers (including the Adviser) may be prone to operational and information security risks resulting from cyber-attacks and/or technological malfunctions. Furthermore, geopolitical tensions may have increased the scale and sophistication of deliberate cybersecurity attacks, particularly those from nation-states or from entities with nation-state backing. In general, cyber-attacks are deliberate, but unintentional events may have similar effects. Cyber-attacks include, among others, stealing or corrupting data maintained online or digitally, preventing legitimate users from accessing information or services on a website, releasing confidential information without authorization, and causing operational disruption. Successful cyber-attacks against, or security breakdowns of, the Fund, the Portfolio, the Adviser or a custodian, transfer agent, or other affiliated or third-party service provider may adversely affect the Fund or its shareholders. For instance, cyber-attacks or technical malfunctions may interfere with the processing of shareholder or other transactions, affect the Fund's ability to calculate its NAV, cause the release of private shareholder information or confidential Fund information, impede trading, cause reputational damage, and subject the Fund to regulatory fines, penalties or financial losses, reimbursement or other compensation costs, and additional compliance costs. Cyber-attacks or technical malfunctions may render records of Fund assets and transactions, shareholder ownership of Fund Shares, and other data integral to the functioning of the Fund inaccessible or inaccurate or incomplete. The Fund may also incur substantial costs for cybersecurity risk management in order to prevent cyber incidents in the future. The Fund and its shareholders could be negatively impacted as a result. While the Adviser has established business continuity plans and systems designed to minimize the risk of cyber-attacks through the use of technology, processes and controls, there are inherent limitations in such plans and systems, including the possibility that certain risks have not been identified, given the evolving nature of this threat. The use of artificial intelligence (“AI”) and machine learning could exacerbate these risks or result in cyber security incidents that implicate personal data. The Fund relies on third-party service providers for many of its day-to-day operations, and will be subject to the risk that the protections and protocols implemented by those service providers will be ineffective to protect the Fund from cyber-attack. The Adviser does not control the cybersecurity plans and systems put in place by third-party service providers, and such third-party service providers may have limited indemnification obligations to the Adviser or the Fund. Similar types of cybersecurity risks or technical malfunctions also are present for issuers of securities in which the Fund invests, which could result in material adverse consequences for such issuers, and may cause the Fund's investment in such securities to lose value.

Portfolio Holdings Disclosure

The Fund's portfolio holdings disclosure policy is described in the Statement of Additional Information (“SAI”).

Management and Organization

Investment Adviser

A reimbursement to the Service Provider would increase fund expenses and may negatively impact the Fund's yield during such period. There is no guarantee that the Voluntary Reduction will be in effect at any given time or that the Fund will be able to avoid a negative yield. The Fund has agreed, subject to certain limitations, to reimburse the applicable Service Provider for the full dollar amount of any Voluntary Reduction incurred after May 1, 2020. The Fund is not obligated to reimburse a Service Provider: (1) more than three years after the end of the fiscal year of the Fund in which the Service Provider provided a Voluntary Reduction; (2) in respect of any business day for which the net annualized one‑day yield of the Fund or applicable Class is less than 0.00%; (3) to the extent that the amount of the reimbursement to all Service Providers on any day exceeds fifty percent of the yield (net of all expenses, exclusive of the reimbursement) of the Fund or the applicable class on that day; (4) to the extent that the amount of such reimbursement would cause the Fund's or applicable class's net yield to fall below the Fund's or applicable class's minimum yield; (5) in respect of any such fee waivers and/or expense reimbursements that are necessary to maintain the Fund's Contractual Total Expense Limit (as defined in the Reimbursement Agreement) which is effective at the time of such fee waivers and/or expense reimbursements; or (6) in any manner that would result in a class bearing the cost of a reimbursement to the Service Provider for any class-specific expense (including, without limitation, fees payable in accordance with a plan authorized pursuant to Rule 12b‑1 under the 1940 Act, or Shareholder Servicing Agreement or similar arrangement) that was waived or reimbursed to the Fund with respect to a different Class. Any such future reimbursement of an applicable Service Provider may result in the total annual operating expenses with respect to a share class of the Fund exceeding the amount of the expense cap under the contractual expense limitation agreement because the expense is not covered by the agreement.

A discussion regarding the Board's consideration of the Fund's Investment Advisory Agreement is provided in the Fund's Form N-CSR filing with the SEC for the period ended June 30, 2024.

The Administrator, Sub-Administrator and Custodian

The Adviser serves as administrator of the Fund. The amount of the fee paid to the Adviser for administrative services may vary by share class. The Fund currently pays the Adviser an administrative fee at the annual rate of 0.05% in respect of the class of shares in this Prospectus. State Street Bank and Trust Company (“State Street”), a subsidiary of State Street Corporation, serves as the sub-administrator for the Fund for a fee that is paid by the Adviser. State Street also serves as custodian of the Fund for a separate fee that is paid by the Fund. SSGA FM serves as administrator of the Portfolio and State Street serves as sub-administrator and custodian of the Portfolio.

The Transfer Agent and Dividend Disbursing Agent

SS&C GIDS, Inc. is the Fund's transfer agent and dividend disbursing agent (the “Transfer Agent”).

The Distributor

State Street Global Advisors Funds Distributors, LLC serves as the Fund's distributor (“SSGA FD”) pursuant to the Distribution Agreement between SSGA FD and the Trust.

The Shareholder Servicing Agent

Additional Information

Shareholder Information

Determination of Net Asset Value

Investing in State Street Institutional Investment Trust Shares

Purchasing Shares

The Fund offers one class of shares through this Prospectus: Administration Class shares available to you subject to the eligibility requirements set forth below. All classes of the Fund share the same investment objective and investments, but the different share classes have different expense structures and eligibility requirements. You should choose the class with the expense structure that best meets your needs for which you are eligible. In choosing a share class, you should consider the amount you plan to invest. Your investment professional can help you choose the share class that best suits your investment needs.

The chart below summarizes the features of the Administration Class. This chart is only a general summary, and you should read the description of the Fund's expenses in the Fund Summary in this Prospectus.

Any applicable minimum purchase amount may be waived for specific investors or types of investors, including, without limitation, retirement plans, employees of State Street Corporation and its affiliates and their family. In the case of shareholders purchasing shares through a Financial Intermediary, the minimum purchase amount may be applied at the level of the Financial Intermediary.

Minimum Initial Investment	$1,000
Maximum Investment	None.
Initial Sales Charge	None. Entire purchase price is invested in shares of the Fund.
Deferred (CDSC) Sales Charge	None.
Distribution and/or Service (12b-1) Fees	0.05% annual fee.

Investors pay no sales load to invest in Administration Class shares of the Fund. The price for Fund Shares is the NAV per share. Purchase requests received by the Fund in good order (a purchase request is in good order if it meets the requirements implemented from time to time by the Transfer Agent or authorized agent of the Fund, and for new accounts includes submission of a completed and signed application and all documentation necessary to open an account) on a Business Day will, if payment is received by FedWire, be priced at the NAV next determined after the order is accepted by the Fund. Payments received by FedWire prior to the last Valuation Time will earn dividend accrual for that purchase. All purchases that are made by check will be priced with the last valuation price and will begin earning dividends the following Business Day after the day the order is accepted. (If you purchase shares by check, your order will not be in good form until the Transfer Agent receives federal funds for the check.) All purchase orders are subject to acceptance by the Fund. The Fund intends to be as fully invested as is practicable; therefore, investments must be made in Federal Funds (i.e., monies credited to the account of the Fund's custodian bank by a Federal Reserve Bank).

The minimum initial investment in Administration Class shares of the Fund is $1,000 although the Adviser may waive the minimum in its discretion. Holdings of related customer accounts may be aggregated for purposes of determining the minimum investment amount. “Related customer accounts” may include, but are not limited to, accounts held by the same investment or retirement plan, financial institution, broker, dealer or intermediary. The Fund and the Adviser reserve the right to increase or decrease the minimum amount required to open or maintain an account. There is no minimum subsequent investment, except in relation to maintaining certain minimum account balances (See “Redeeming Shares” below). The Fund requires prior notification of subsequent investments in excess of $50,000,000. The Fund reserves the right to cease accepting investments at any time or to reject any investment order. In addition, the Fund may limit the amount of a purchase order received after 3:00 p.m. ET.

How to Purchase Shares

By Mail:

An initial investment in the Fund must be preceded or accompanied by a completed, signed Institutional Account

Application Form, sent to:

State Street Funds

P.O. Box 219737

Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds

801 Pennsylvania Avenue, Suite 219737

Kansas City, MO 64105-1307

By Telephone/Fax:

An initial investment in the Fund must be preceded or accompanied by a completed, signed Institutional Account

Application Form, faxed to (816) 218-0400. Call the Fund at (866) 392-0869 between the hours of 8:00 a.m. ET

and 6:00 p.m. ET to:

➢ confirm receipt of the faxed Institutional Account Application Form (initial purchases only),

➢ request your new account number (initial purchases only),

➢ confirm the amount being wired and wiring bank, and

➢ receive a confirmation number for your purchase order (your trade is not effective until you have received a

confirmation number from the Fund).

For your initial investment, send the original, signed Institutional Account Application Form to the address above.

Wire Instructions:

Instruct your bank to transfer money by Federal Funds wire to:

State Street Bank and Trust Company

1 Iron Street

Boston, MA 02210

ABA# 011000028

DDA# 9904-631-0

State Street Institutional Investment Trust

Fund Name

Class Name

Account Number

Account Registration

On Columbus Day and Veterans Day, you will not be able to purchase shares by wiring Federal Funds because the

Federal Funds wiring does not occur on those days. Payment for Fund Shares must be in Federal Funds (or

converted to Federal Funds by the Transfer Agent) by the close of the Federal Reserve.

The Fund and the Fund's agents are not responsible for transfer errors by the sending or receiving bank and will

not be liable for any loss incurred due to a wire transfer not having been received.

Redeeming Shares

An investor may redeem all or any portion of its investment. Redemption orders are processed at the NAV next determined after the Fund receives a redemption order in good form. If the Fund receives a redemption order in good form prior to 5:00 p.m. ET on a Business Day, shares are redeemed and the Fund typically sends payment for redeemed shares on that day, but no later than the next Business Day, if redemption proceeds are sent by wire or ACH. If redemption proceeds are sent by check, the Fund pays out redemption proceeds on the next Business Day. If a full redemption order is requested, no dividends will accrue with respect to shares on the day the redemption proceeds are sent. If a redemption order is placed after 5:00 p.m. ET, the Fund typically expects to pay out redemption proceeds on the next Business Day (and dividends will accrue up to, but not including, the day that redemption proceeds are sent), but no later than the following Business Day. The Fund may postpone and/or suspend redemption and payment beyond the foregoing time periods only as follows:

For any period during which there is a non-routine closure of the Fedwire or applicable Federal Reserve Banks;

For any period (1) during which the NYSE is closed other than customary week-end and holiday closings or (2) during which trading on the NYSE is restricted;

For any period during which the SEC has, by rule or regulation, deemed that (1) trading shall be restricted or (2) an emergency exists;

For any period that the SEC, may by order permit for your protection; or

How to Redeem Shares


By Mail:	Send a signed letter to: State Street Institutional Investment Trust Funds P.O. Box 219737 Kansas City, MO 64121-9737
	The letter should include information necessary to process your request as described below. The Fund may require a medallion guarantee in certain circumstances. See “Medallion Guarantees” below.
By Overnight:	State Street Institutional Investment Trust Funds 801 Pennsylvania Avenue, Suite 219737 Kansas City, MO 64105-1307
By Telephone:	Please call (866) 392-0869 between the hours of 8:00 a.m. and 6:00 p.m. ET.
The Fund will need the following information to process your redemption request:
➢ name(s) of account owners; ➢ account number(s); ➢ the name of the Fund; ➢ your daytime telephone number; and ➢ the dollar amount or number of shares being redeemed.

On any day that the Fund calculates its NAV earlier than normal, the Fund reserves the right to adjust the times noted above for purchasing and redeeming shares.

Medallion Guarantees. Certain redemption requests must include a medallion guarantee for each registered account owner if any of the following apply:

•

Your account address has changed within the last 10 Business Days.

•

Redemption proceeds are being transferred to an account with a different registration.

•

A wire is being sent to a financial institution other than the one that has been established on your Fund account.

•

Other unusual situations as determined by the Transfer Agent.

The Fund may terminate the receipt of redemption orders by telephone at any time, in which case you may redeem shares by other means.

If you choose to purchase or redeem shares by sending instructions by regular mail, they will not be deemed received in good order until they are released by the post office and redelivered to the Transfer Agent's physical location at 801 Pennsylvania Avenue, Suite 219737 in Kansas City, MO 64105-1307. There will be a time lag, which may be one or more days, between regular mail receipt at the post office box and redelivery to such physical location in Kansas City, and the Fund's NAV may change over those days. You might consider using express rather than regular mail if you believe the time of receipt of your transaction request to be sensitive.

Exchanging Shares

An exchange occurs when you use the proceeds from the redemption of shares of the Fund in the State Street Institutional Investment Trust to simultaneously purchase shares of a different Fund in the State Street Institutional Investment Trust. Exchanges may be made within the same class (i.e. Administration Class shares for Administration Class shares). The account holding the original shares must be registered in the same name as the account holding the new shares received in the exchange. You may make exchange requests by telephone, or by mail. See Purchasing Shares and Redeeming Shares. Exchanges are subject to the terms applicable to the purchases of the fund into which you are exchanging. Exchange privileges may not be available for mutual funds advised by SSGA FM (the “State Street Funds”) and may be suspended or rejected. Effective October 12, 2016, exchanges into or from any share of the State Street Institutional Liquid Reserves Fund will not be permitted.

Excessive Trading

Delivery of Documents to Accounts Sharing an Address

To reduce expenses, we may mail only one copy of the Fund's Prospectus and the annual and semi-annual report to those addresses shared by two or more accounts. If you wish to receive individual copies of these documents, please call us at (866) 392-0869, or contact your financial institution. We will begin sending you individual copies thirty (30) days after receiving your request.

Unclaimed Property

Many states have unclaimed property rules that provide for transfer to the state (also known as “escheatment”) of unclaimed property under various circumstances. These circumstances include inactivity (e.g., no owner-initiated contact for a certain period), returned mail (e.g., when mail sent to a shareholder is returned by the post office as undeliverable), or a combination of both inactivity and returned mail. If a State Street Fund identifies property as unclaimed, it will attempt to contact the shareholder, but if that attempt is unsuccessful, the account may be considered abandoned and escheated to the state after the passage of a certain period of time (as required by applicable state law).

encourage you to contact the financial intermediary regarding applicable state unclaimed property laws. The Fund, the transfer agent and the distributor will not be liable to shareholders or their representatives for good faith compliance with state unclaimed property laws. Please check your state's unclaimed or abandoned property website for specific information.

If you are a resident of the state of Texas, you may designate a representative to receive escheatment notifications by completing and submitting a designation form, which you can find on the website of the Texas Comptroller. Designating such a representative may be beneficial, since Texas law provides that the escheatment period will cease if the representative, after receiving an escheatment notification regarding your account, communicates knowledge of your location and confirms that you have not abandoned your account. You can mail a completed designation form to the Fund (if you hold shares directly with the Fund) or to your financial intermediary (if you do not hold shares directly with the Fund).

Dividends, Distributions and Tax Considerations

The Fund intends to declare dividends on shares from net investment income daily and pay them as of the last Business Day of each month. Distributions from capital gains, if any, will be made annually in December. Dividends of investment income and capital gain distributions will be paid in additional shares on the reinvestment date unless you have elected to receive them in cash. No interest will accrue on the amounts represented by uncashed distribution checks. If you have elected to receive distributions by check, and the postal or other delivery service is unable to deliver the checks because of an incorrect mailing address, or if a distribution check remains uncashed for six months, the uncashed distribution and all future distributions will be reinvested at the then-current NAV of the Fund.

as either short-term or long-term capital gain, depending upon how long you have held such Fund Shares. The Internal Revenue Service (the “IRS”) permits a simplified method of accounting for gains and losses realized upon the disposition of shares of a regulated investment company that is a money market fund. Shareholders should see the SAI for further information.

An additional 3.8% Medicare contribution tax is imposed on the “net investment income” of individuals, estates and trusts to the extent their income exceeds certain threshold amounts. Net investment income generally includes for this purpose dividends paid by the Fund and net gains recognized on the redemption (or other taxable disposition) of Fund Shares.

Financial Intermediary Arrangements

Distribution Arrangements and Rule 12b-1 Fees

The Fund has adopted a distribution plan pursuant to Rule 12b-1 under the 1940 Act under which the Fund may compensate SSGA FD (or others) for services in connection with the distribution of the Fund's shares and for services provided to Fund shareholders (the “Plan”). The Plan calls for payments at an annual rate (based on average daily net assets) of 0.05% of the Fund's net assets attributable to its Administration Class shares. Because these fees are paid out of the assets of the Fund attributable to its shares on an ongoing basis, they will increase the cost of your investment and may cost you more over time than paying other types of sales charges. Long-term shareholders of the Fund may pay more in Rule 12b-1 fees than the economic equivalent of the maximum front-end sales charge permitted by the FINRA.

The Fund may pay distribution fees and other amounts described in this Prospectus at a time when shares of the Fund are unavailable for purchase.

Other Payments to Financial Intermediaries

aries for distribution and/or shareholder services varies. Any compensation is typically a percentage of the value of the Financial Intermediary's clients' investments in the Fund or a per account fee. The variation in compensation may, but will not necessarily, reflect enhanced or additional services provided by the Financial Intermediary.

If you invest through a Financial Intermediary and meet the eligibility criteria for more than one share class, you should discuss with your Financial Intermediary which share class is appropriate for you. Your financial adviser and the Financial Intermediary employing him or her may have an incentive to recommend one share class over another, when you are eligible to invest in more than one share class. Please speak with your financial adviser to learn more about the total amounts paid to your financial adviser and his or her firm by the Fund or its affiliates with respect to the different share classes offered by the Fund.

SSGA FD and its affiliates (including SSGA FM), at their own expense and out of their own assets, may also provide other compensation to Financial Intermediaries in connection with sales of the Fund's shares or the servicing of shareholders or shareholder accounts. Such compensation may include, but is not limited to, financial assistance to Financial Intermediaries in connection with conferences, sales, or training programs for their employees; seminars for the public; advertising or sales campaigns; or other Financial Intermediary-sponsored special events. In some instances, this compensation may be made available only to certain Financial Intermediaries whose representatives have sold or are expected to sell significant amounts of shares. Dealers may not use sales of the Fund's shares to qualify for this compensation to the extent prohibited by the laws or rules of any state or any self-regulatory agency, such as FINRA.

Financial Highlights

The financial highlight tables are intended to help you understand the Fund's financial performance since the inception date of the Administration Class Shares. Certain information reflects the performance results for a single Fund Share. The total returns in the table represent the rate that an investor would have earned (or lost) on an investment in the Fund (assuming reinvestment of all dividends and distributions). This information has been audited by Ernst & Young LLP, the Trust's independent registered public accounting firm, whose report, along with the Fund's financial highlights and financial statements, are included in the Fund's Form N-CSR filing, which is available upon request. Any references to Notes in these financial highlight tables refer to the “Notes to Financial Statements” section of the Fund's financial statements, and the financial information included in these tables should be read in conjunction with the financial statements incorporated by reference in the SAI.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL U.S. GOVERNMENT MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Administration Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Income (loss) from investment operations:
Net investment income (loss)	0.0486	0.0469	0.0139	0.0001	0.0026
Net realized gain (loss)	(0.0000 )(b)	0.0000 (b)	0.0000 (b)	—	0.0000 (b)
Total from investment operations	0.0486	0.0469	0.0139	0.0001	0.0026
Distributions to shareholders from:
Net investment income	(0.0486 )	(0.0469 )	(0.0139 )	(0.0001 )	(0.0026 )
Net asset value, end of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Total return (c)	4.97 %	4.80 %	1.39 %	0.01 %	0.26 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$1,647,046	$2,479,017	$2,250,119	$2,230,490	$2,550,831
Ratios to Average Net Assets:
Total expenses	0.36 %	0.36 %	0.37 %	0.37 %	0.37 %
Net expenses	0.36 %	0.36 %	0.30 %	0.07 %	0.23 %
Net investment income (loss)	4.88 %	4.71 %	1.39 %	0.01 %	0.20 %

(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.

Contacting the State Street Funds

Online:	www.ssga.com	24 hours a day, 7 days a week
Phone:	(877) 521-4083	Monday – Friday 8:00 am – 6:00 pm EST

Written requests should be sent to:

Regular mail	Overnight/Registered, Express, Certified Mail
State Street Funds P.O. Box 219737 Kansas City, MO 64121-9737	State Street Funds 801 Pennsylvania Avenue, Suite 219737 Kansas City, MO 64105-1307

For more information about the Fund:

The Fund's SAI includes additional information about the Fund and is incorporated by reference into this document. Additional information about the Fund's investments is available in the Fund's most recent annual and semi-annual reports to shareholders and in the Fund's Form N-CSR filing. In the Fund's annual report, you will find a discussion of the market conditions and investment strategies that significantly affected the Fund's performance during its last fiscal year. In the Fund's Form N-CSR, you will find the Fund's annual and semi-annual financial statements. The Fund's SAI is available, without charge, upon request. The Fund's annual and semi-annual reports are available, without charge, upon request. Shareholders in the Fund may make inquiries to the Fund to receive such information by calling (877) 521-4083 or the customer service center at the telephone number shown in the accompanying contract prospectus, if applicable. The Fund's Prospectus, SAI, annual and semi-annual reports to shareholders and other information such as the Fund's financial statements are available, free of charge, on the Fund's website at www.ssga.com/cash.

SSGA Funds Management, Inc

ONE IRON STREET

BOSTON, MASSACHUSETTS 02210

SALXXARIPROThe State Street Institutional Investment Trust's Investment Company Act File Number is 811-09819.

Prospectus

April 30, 2025

State Street Institutional
Investment Trust

Neuberger Berman Money Fund

A Private Label of the Institutional Class Shares of the

State Street Institutional U.S. Government Money Market Fund (SAHXX)

State Street Institutional Treasury Plus Money Market Fund (SAJXX)

Advised by SSGA Funds Management, Inc.,

a subsidiary of State Street Corporation

The U.S. Securities and Exchange Commission has not approved or disapproved these securities or passed upon the adequacy of this Prospectus. Any representation to the contrary is a criminal offense.

An investment in any of the Funds offered by this Prospectus is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Each Fund offers multiple classes of shares. This Prospectus covers only the Institutional Class.

TABLE OF CONTENTS

Fund Summaries	1
State Street Institutional U.S. Government Money Market Fund	1
State Street Institutional Treasury Plus Money Market Fund	7
Additional Information About Investment Objectives, Principal Strategies and Risks	12
Additional Information About Non-Principal Investment Strategies and Risks	19
Portfolio Holdings Disclosure	20
Management and Organization	21
Shareholder Information	23
Dividends, Distributions and Tax Considerations	29
Financial Intermediary Arrangements	30
Financial Highlights	31

State Street Institutional U.S. Government Money Market Fund

Investment Objective

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Management Fee	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%
Other Expenses1	0.09%
Total Annual Fund Operating Expenses1	0.14%

“Other Expenses” and “Total Annual Fund Operating Expenses” have been restated to reflect current fees.

Example:

1 year	3 years	5 years	10 years
$14	$45	$79	$179

Principal Investment Strategies

The Fund attempts to meet its investment objective by investing in:

•

Repurchase agreements collateralized by U.S. government securities.

Principal Risks

Repurchase Agreement Risk: Repurchase agreements may be viewed as loans made by the Fund, which are collateralized by the securities subject to repurchase. If the Fund's counterparty should default on its obligations and the Fund is delayed or prevented from recovering the collateral, or if the value of the collateral is insufficient, the Fund may realize a loss.

Market Risk: The Fund's investments are subject to changes in general economic conditions, general market fluctuations and the risks inherent in investment in securities markets. Investment markets can be volatile and prices of investments can change substantially due to various factors, including, but not limited to, economic growth or recession, changes in interest rates, inflation, changes in the actual or perceived creditworthiness of issuers, and general market liquidity. The Fund is subject to the risk that geopolitical events will disrupt securities markets and adversely affect global economies and markets. Local, regional or global events such as war, military conflicts, acts of terrorism, trade policy changes or disputes, the threat or actual imposition of tariffs, natural disasters, the spread of infectious illness or other public health issues, or other events could have a significant impact on the Fund and its investments.

Performance

The bar chart and table below provide some indication of the risks of investing in the U.S. Government Fund by illustrating the variability of the Fund's returns from year-to-year. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (877) 521-4083 or by visiting our website at www.ssga.com.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	1.34%	Q4 2023
Lowest Quarterly Return	0.00%	Q4 2020

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Since Inception
	One Year	Five Years	1/18/2018
Institutional Class	5.21 %	2.42 %	2.27 %

To obtain the Fund's current yield, please call (877) 521-4083.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

To establish an account	$2,000.00
To add to an existing account	$100.00

You may purchase or redeem Fund Shares on any day the Fund is open for business.

You may purchase or redeem Fund Shares by written request or wire transfer. Written requests should be sent to:

By Mail:

Send a signed letter to:
Neuberger Berman Funds
State Street Global Advisors
P.O. Box 219189
Kansas City, MO 64121-9189

By Overnight/Registered, Express, Certified Mail:

Send a signed letter to:
Neuberger Berman Funds
c/o State Street Institutional Trust Funds
State Street Global Advisors
801 Pennsylvania Avenue, Suite 219189
Kansas City, MO 64105-1307

By Telephone:

For wire transfer instructions, please call (800)-877-9700 between 9:00 a.m. and 4:30 p.m. Eastern time. Redemptions by telephone are permitted only if you previously have been authorized for these transactions.

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

State Street Institutional Treasury Plus Money Market Fund

Investment Objective

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Management Fee	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%
Other Expenses	0.09%
Total Annual Fund Operating Expenses	0.14%

Example:

1 year	3 years	5 years	10 years
$14	$45	$79	$179

Principal Investment Strategies

Principal Risks

Market Risk: The Fund's investments are subject to changes in general economic conditions, general market fluctuations and the risks inherent in investment in securities markets. Investment markets can be volatile and prices of investments can change substantially due to various factors, including, but not limited to, economic growth or recession, changes in interest rates, inflation, changes in the actual or perceived creditworthiness of issuers, and general market liquidity. The Fund is subject to the risk that geopolitical events will disrupt securities markets and adversely affect global economies and markets. Local, regional or global events such as war, military conflicts, acts of terrorism, trade policy changes or disputes, the threat or actual imposition of tariffs, natural disasters, the spread of infectious illness or other public health issues, or other events could have a significant impact on the Fund and its investments.

Performance

The bar chart and table below provide some indication of the risks of investing in the Treasury Plus Fund by illustrating the variability of the Fund's returns from year-to-year. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (877) 521-4083 or by visiting our website at www.ssga.com.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	1.33%	Q4 2023
Lowest Quarterly Return	0.00%	Q3 2021

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Since Inception
	One Year	Five Years	7/30/2018
Institutional Class	5.20 %	2.42 %	2.34 %

To obtain the Fund's current yield, please call (877) 521-4083.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

To establish an account	$2,000.00
To add to an existing account	$100.00

You may purchase or redeem Fund Shares on any day the Fund is open for business.

You may purchase or redeem Fund Shares by written request or wire transfer. Written requests should be sent to:

By Mail:

Send a signed letter to:
Neuberger Berman Funds
State Street Global Advisors
P.O. Box 219189
Kansas City, MO 64121-9189

By Overnight/Registered, Express, Certified Mail:

Send a signed letter to:
Neuberger Berman Funds
c/o State Street Institutional Trust Funds
State Street Global Advisors
801 Pennsylvania Avenue, Suite 219189
Kansas City, MO 64105-1307

By Telephone:

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

Additional Information About Investment Objectives, Principal Strategies and Risks

Investment Objective

The investment objective of each of the U.S. Government Fund and the Treasury Plus Fund, as stated in each Fund's Summary, may be changed without shareholder approval.

U.S. Government Fund

Principal Investment Strategies

The U.S. Government Fund is a government money market fund and invests only in obligations issued or guaranteed as to principal and/or interest, as applicable, by the U.S. government or its agencies and instrumentalities, as well as repurchase agreements secured by such instruments. The Fund will provide shareholders with at least sixty (60) days' prior notice of any change in this investment policy. The Fund may hold a portion of its assets in cash pending investment, to satisfy redemption requests or to meet the Fund's other cash management needs.

The Fund follows a disciplined investment process that attempts to provide stability of principal, liquidity and current income, by investing in U.S. government securities. Among other things, SSGA FM conducts its own credit analyses of potential investments and portfolio holdings, and relies substantially on a dedicated short-term credit research team. The Fund invests in accordance with regulatory requirements applicable to money market funds. Regulations require, among other things, a money market fund to invest only in short-term, high quality debt obligations (generally, securities that have remaining maturities of 397 calendar days or less, with the exception of certain floating rate securities that may have final maturities longer than 397 days but use maturity shortening provisions to meet the 397 day requirement, and that the Fund believes present minimal credit risk), to maintain a maximum dollar-weighted average maturity and dollar-weighted average life of sixty (60) days or less and 120 days or less, respectively, and to meet requirements as to portfolio diversification and liquidity. All securities held by the Fund are U.S. dollar-denominated, and they may have fixed, variable or floating interest rates.

The Fund attempts to meet its investment objective by investing in:

•

Repurchase agreements collateralized by U.S. government securities.

Treasury Plus Fund

Principal Investment Strategies

The Treasury Plus Fund is a government money market fund and attempts to meet its investment objective by investing only in U.S. Treasury bills, notes and bonds (which are direct obligations of the U.S. government) and repurchase agreements collateralized by these obligations. The Fund will provide shareholders with at least 60 days' prior notice of any change in this investment policy. The Fund may hold a portion of its assets in cash pending investment, to satisfy redemption requests or to meet the Fund's other cash management needs.

Additional Information About Risks

Income Risk (principal risk for the U.S. Government Fund). A Fund's income may decline due to falling interest rates or other factors. Issuers of securities held by a Fund may call or redeem the securities during periods of falling interest rates, and the Fund would likely be required to reinvest in securities paying lower interest rates. If an obligation held by a Fund is prepaid, the Fund may have to reinvest the prepayment in other obligations paying income at lower rates. A reduction in the income earned by a Fund may limit the Fund's ability to achieve its objective.

folio or a Fund to experience large redemptions, such as changes in investors' circumstances; changes in the eligibility criteria for a Portfolio or a Fund or share class of the Fund; liquidations, reorganizations, repositionings, or other announced Portfolio or Fund events; or changes in investment objectives, strategies, policies, risks, or investment personnel.

Low Short-Term Interest Rate Risk. During market conditions in which short-term interest rates are at low levels, a Fund's yield can be very low. During these conditions, it is possible that a Fund will generate an insufficient amount of income to pay its expenses, and that it will not be able to pay a daily dividend and may have a negative yield (i.e., it may lose money on an operating basis). It is possible that a Fund would, during these conditions, maintain a substantial portion of its assets in cash, on which it may earn little, if any, income.

Market Disruption and Geopolitical Risk. A Fund is subject to the risk that geopolitical events will disrupt securities markets and adversely affect global economies and markets. War, terrorism, and related geopolitical events have led, and in the future may lead, to increased short-term market volatility and may have adverse long-term effects on U.S. and world economies and markets generally. Likewise, trade policy changes or disputes, natural and environmental disasters, pandemics and epidemics, and systemic market dislocations may be highly disruptive to economies and markets. Those events, as well as other changes in foreign and domestic economic and political conditions, also could adversely affect individual issuers or related groups of issuers, securities markets, interest rates, credit ratings, inflation, investor sentiment, and other factors affecting the value of a Fund's investments. Given the increasing interdependence among global economies and markets, conditions in one country, market, or region might adversely affect markets, issuers, and/or foreign exchange rates in other countries, including the U.S. Any partial or complete dissolution of the Economic and Monetary Union of the European Union, or any increased uncertainty as to its status, could have significant adverse effects on currency and financial markets, and on the values of a Fund's investments. On January 31, 2020, the United Kingdom (“UK”) formally withdrew from the European Union (“EU”) (commonly known as “Brexit”). An agreement between the UK and the EU governing their future trade relationship became effective January 1, 2021, but that agreement does not include an agreement on financial services, and it is unlikely that such agreement will be concluded. Moreover, the UK government has started a program of financial services law reform with the ultimate aim of repealing many EU financial services laws that were assimilated into UK law from January 1, 2021, and replacing them with legislation or rules made by the UK government or financial services regulators. Accordingly, uncertainty remains in certain areas as to the future relationship between the UK and the EU. Brexit has already had a significant impact on the UK, Europe, and global economies, and could continue to result in volatility and illiquidity, legal, political, economic and regulatory uncertainties and lower economic growth for these economies that could in turn have an adverse effect on the value of the Fund's investments. Any further exits from the EU, or the possibility of such exits, or the abandonment of the euro, may cause additional market disruption globally and introduce new legal and regulatory uncertainties.

Money Market Fund Risk. An investment in a money market fund is not a deposit of any bank and is not insured or guaranteed by the FDIC or any other government agency. Although a money market fund generally seeks to preserve the value of its shares at $1.00 per share, there can be no assurance that it will do so, and it is possible to lose money by investing in a money market fund. A major or unexpected change in interest rates or a decline in the credit quality of an issuer or entity providing credit support, an inactive trading market for money market instruments, or adverse market, economic, industry, political, regulatory, geopolitical, and other conditions could cause a money market fund's share price to fall below $1.00. It is possible that a money market fund will issue and redeem shares at $1.00 per share at times when the fair value of the money market fund's portfolio per share is more or less than $1.00. Rule 2a-7 as adopted by the SEC permits a money market fund to impose a liquidity fee upon the sale of fund shares under certain circumstances, however the Treasury Plus Fund and U.S. Government Fund are both government money market funds that have not elected to be subject to the liquidity fee provision of Rule 2a-7. None of State Street Corporation, State Street, State Street Global Advisors, SSGA FM or their affiliates (collectively, the “State Street Entities”) guarantee the value of an investment in a money market fund at $1.00 per share. Investors should have no expectation of capital support to a money market fund from the State Street Entities.

Mortgage-Related and Other Asset-Backed Securities Risk (principal risk for the U.S. Government Fund). Investments in mortgage-related and other asset-backed securities are subject to the risk of significant credit downgrades, illiquidity, and defaults to a greater extent than many other types of fixed income investments. The liquidity of mortgage-related and asset-backed securities may change over time. Mortgage-related securities represent a participation in, or are secured by, mortgage loans. Other asset-backed securities are typically structured like mortgage-related securities, but instead of mortgage loans or interests in mortgage loans, the underlying assets may include, for example, items such as motor vehicle installment sales or installment loan contracts, leases on various types of real and personal property, and receivables from credit card agreements. During periods of falling interest rates, mortgage-related and other asset-backed securities, which typically provide the issuer with the right to prepay the security prior to maturity, may be prepaid, which may result in a Fund having to reinvest the proceeds in other investments at lower interest rates. During periods of rising interest rates, the average life of mortgage-related and other asset-backed securities may extend because of slower-than expected principal payments. This may lock in a below market interest rate, increase the security's duration and interest rate sensitivity, and reduce the value of the security. As a result, mortgage-related and other asset-backed securities may have less potential for capital appreciation during periods of declining interest rates than other debt securities of comparable maturities, although they may have a similar risk of decline in market values during periods of rising interest rates. Prepayment rates are difficult to predict and the potential impact of prepayments on the value of a mortgage-related or other asset-backed security depends on the terms of the instrument and can result in significant volatility. The price of a mortgage-related or other asset-backed security also depends on the credit quality and adequacy of the underlying assets or collateral. Mortgage-related or other asset-backed securities issued by non-governmental issuers (such as commercial banks, savings and loan institutions, private mortgage insurance companies, mortgage bankers and other secondary market issuers) will generally entail greater credit risk than obligations guaranteed by the U.S. government. Defaults on the underlying assets, if any, may impair the value of a mortgage-related or other asset-backed security. For some asset-backed securities in which a Fund invests, such as those backed by credit card receivables, the underlying cash flows may not be supported by a security interest in a related asset. Moreover, the values of mortgage-related and other asset-backed securities may be substantially dependent on the servicing of the underlying asset pools, and are therefore subject to risks associated with the negligence or malfeasance by their servicers and to the credit risk of their servicers. In certain situations, the mishandling of related documentation may also affect the rights of securities holders in and to the underlying collateral. There may be legal and practical limitations on the enforceability of any security interest granted with respect to underlying assets, or the value of the underlying assets, if any, may be insufficient if the issuer defaults.

Reinvestment Risk (principal risk for the U.S. Government Fund). Income from a Fund's portfolio may decline when the Fund invests the proceeds from investment income, sales of portfolio securities or matured, traded or called debt obligations. For instance, during periods of declining interest rates, an issuer of debt obligations may exercise an option to redeem securities prior to maturity, forcing a Fund to reinvest the proceeds in lower-yielding securities. A decline in income received by a Fund from its investments is likely to have a negative effect on the yield and total return of the Fund Shares.

Repurchase Agreement Risk. A repurchase agreement is an agreement to buy a security from a seller at one price and a simultaneous agreement to sell it back to the original seller at an agreed-upon price, typically representing the purchase price plus interest. Repurchase agreements may be viewed as loans made by a Fund, which are collateralized by the securities subject to repurchase. A Fund's investment return on such transactions will depend on the counterparty's willingness and ability to perform its obligations under a repurchase agreement. If a Fund's counterparty should default on its obligations and a Fund is delayed or prevented from recovering the collateral, or if the value of the collateral is insufficient, a Fund may realize a loss.

the U.S. government agencies or instrumentalities in which the Fund invests may have a significant impact on a Fund's performance. Events that would adversely affect the market prices of securities issued or guaranteed by one government agency or instrumentality may adversely affect the market price of securities issued or guaranteed by other government agencies or instrumentalities.

U.S. Government Securities Risk (principal risk for the U.S. Government Fund). U.S. government securities, such as Treasury bills, notes and bonds and mortgage-backed securities guaranteed by the Government National Mortgage Association (“Ginnie Mae”), are supported by the full faith and credit of the United States; others are supported by the right of the issuer to borrow from the U.S. Treasury; others are supported by the discretionary authority of the U.S. government to purchase the agency's obligations; and still others are supported only by the credit of the issuing agency, instrumentality, or enterprise. Although U.S. government-sponsored enterprises such as the Federal Home Loan Mortgage Corporation (“Freddie Mac”) and the Federal National Mortgage Association (“Fannie Mae”) may be chartered or sponsored by Congress, they are not funded by Congressional appropriations, and their securities are not issued by the U.S. Treasury nor supported by the full faith and credit of the U.S. government. There is no assurance that the U.S. government would provide financial support to its agencies and instrumentalities if not required to do so. In addition, certain governmental entities have been subject to regulatory scrutiny regarding their accounting policies and practices and other concerns that may result in legislation, changes in regulatory oversight and/or other consequences that could adversely affect the credit quality, availability, or investment character of securities issued by these entities. The value and liquidity of U.S. government securities may be affected adversely by changes in the ratings of those securities. Securities issued by the U.S. Treasury historically have been considered to present minimal credit risk. The downgrade in the long-term U.S. credit rating by at least two major rating agencies has introduced greater uncertainty about the ability of the U.S. to repay its obligations. Further credit rating downgrades or a U.S. credit default could decrease the value and increase the volatility of a Fund's investments.

Variable and Floating Rate Securities Risk. Variable or floating rate securities are debt securities with variable or floating interest rates payments. Variable or floating rate securities bear rates of interest that are adjusted periodically according to formulae intended generally to reflect market rates of interest and allow a Fund to participate (determined in accordance with the terms of the securities) in increases in interest rates through upward adjustments of the coupon rates on the securities. However, during periods of increasing interest rates, changes in the coupon rates may lag behind the changes in market rates or may have limits on the maximum increases in coupon rates. Alternatively, during periods of declining interest rates, the coupon rates on such securities will typically readjust downward resulting in a lower yield. A Fund may also invest in variable or floating rate equity securities, whose dividend payments vary based on changes in market rates of interest or other factors.

Additional Information About Non-Principal Investment Strategies and Risks

transactions, shareholder ownership of Fund Shares, and other data integral to the functioning of a Fund inaccessible or inaccurate or incomplete. A Fund may also incur substantial costs for cybersecurity risk management in order to prevent cyber incidents in the future. A Fund and its shareholders could be negatively impacted as a result. While the Adviser has established business continuity plans and systems designed to minimize the risk of cyber-attacks through the use of technology, processes and controls, there are inherent limitations in such plans and systems, including the possibility that certain risks have not been identified, given the evolving nature of this threat. The use of artificial intelligence (“AI”) and machine learning could exacerbate these risks or result in cyber security incidents that implicate personal data. Each Fund relies on third-party service providers for many of its day-to-day operations, and will be subject to the risk that the protections and protocols implemented by those service providers will be ineffective to protect the Fund from cyber-attack. The Adviser does not control the cybersecurity plans and systems put in place by third-party service providers, and such third-party service providers may have limited indemnification obligations to the Adviser or the Funds. Similar types of cybersecurity risks or technical malfunctions also are present for issuers of securities in which each Fund invests, which could result in material adverse consequences for such issuers, and may cause a Fund's investment in such securities to lose value.

Portfolio Holdings Disclosure

The Funds' portfolio holdings disclosure policy is described in the Statement of Additional Information (“SAI”).

Management and Organization

Investment Adviser

SSGA FM serves as the investment adviser to each Fund and corresponding Portfolio pursuant to an investment advisory agreement (“Investment Advisory Agreement”) between the Trust and the Adviser, and, subject to the oversight of the Board, is responsible for the investment management of each Fund. The Adviser provides an investment management program for each Fund and manages the investment of each Fund's assets. In addition, the Adviser provides administrative, compliance and general management services to each Fund. The Adviser is a wholly-owned subsidiary of State Street Global Advisors, Inc., which itself is a wholly-owned subsidiary of State Street Corporation. The Adviser is registered with the SEC under the Investment Advisers Act of 1940, as amended. The Adviser and certain other affiliates of State Street Corporation make up SSGA. SSGA is one of the world's largest institutional money managers and the investment management arm of State Street Corporation. As of December 31, 2024, the Adviser managed approximately $1.11 trillion in assets and SSGA managed approximately $4.72 trillion in assets. The Adviser's principal business address is One Iron Street, Boston, Massachusetts 02210.

Each Fund has entered into an investment advisory agreement with the Adviser pursuant to which the Adviser will manage the Fund's assets directly, for compensation paid at an annual rate of 0.05% of the Fund's average daily net assets, in the event that the Fund were to cease investing substantially all of its assets in its corresponding Portfolio or another investment company with essentially the same investment objectives and policies as the Fund. The Adviser does not receive any management fees from a Fund under that agreement so long as the Fund continues to invest substantially all of its assets in the corresponding Portfolio or in another investment company with essentially the same investment objectives and policies as the Fund. The Adviser places all orders for purchases and sales of the Portfolios' investments. For the year ended December 31, 2024, the effective management fee paid, reflecting certain fee waivers and expense reimbursements of the Adviser, was 0.05% for Treasury Plus Portfolio and 0.05% for U.S. Government Portfolio.

In addition to any contractual expense limitation for a Fund, which is described above, each of the Adviser and State Street Global Advisors Funds Distributors, LLC (each a “Service Provider”) also may voluntarily reduce all or a portion of its fees and/or reimburse expenses for a Fund or a share class to the extent necessary to maintain a certain minimum net yield, which may vary from time to time and from share class to share class within a Fund, in SSGA FM's sole discretion (any such waiver or reimbursement of expenses being referred to herein as a “Voluntary Reduction”). Under an

agreement with the Service Providers relating to the Voluntary Reduction, the Funds and the Portfolios have agreed to reimburse the Service Providers for the full dollar amount of any Voluntary Reduction beginning on May 1, 2020, subject to certain limitations. Each Service Provider may, in its sole discretion, irrevocably waive receipt of any or all reimbursement amounts due from a Fund.

A discussion regarding the Board's consideration of the Funds' Investment Advisory Agreement is provided in the Funds' Form N-CSR filing with the SEC for the period ended June 30, 2024.

The Administrator, Sub-Administrator and Custodian

The Adviser serves as administrator of each Fund. The amount of the fee paid to the Adviser for administrative services may vary by share class. Each Fund currently pays the Adviser an administrative fee at the annual rate of 0.05% in respect of the class of shares in this Prospectus. State Street Bank and Trust Company (“State Street”), a subsidiary of State Street Corporation, serves as the sub-administrator for the Funds for a fee that is paid by the Adviser. State Street also serves as custodian of the Funds for a separate fee that is paid by the Funds. SSGA FM serves as administrator of the Portfolios and State Street serves as sub-administrator and custodian of the Portfolios.

The Transfer Agent and Dividend Disbursing Agent

SS&C GIDS, Inc. is the Funds' transfer agent and dividend disbursing agent (the “Transfer Agent”).

The Distributor

State Street Global Advisors Funds Distributors, LLC serves as the Funds' distributor (“SSGA FD”) pursuant to the Distribution Agreement between SSGA FD and the Trust.

The Shareholder Servicing Agent

The “Servicing Agent”

Neuberger Berman Investment Advisers LLC (“Neuberger Berman”) serves as the servicing agent for shareholders of mutual funds distributed and advised by Neuberger Berman (a “Neuberger Berman Fund”) that are also shareholders of a Fund.

Additional Information

Shareholder Information

Note: This prospectus is intended to relate principally to purchases of shares through Neuberger Berman. Information appearing below assumes that shares are purchased and redeemed through Neuberger Berman and is based on information previously provided by Neuberger Berman to the Funds.

Determination of Net Asset Value

Each of the Funds determines its NAV per share once each Business Day (as defined below), typically at 5:00 p.m. ET (the time when the Fund determines its NAV per share is referred to herein as the “Valuation Time”). The Funds reserve the right to advance the time for accepting purchase or redemption orders and/or the Valuation Time on any day when the NYSE, bond markets (as recommended by The Securities Industry and Financial Markets Association (“SIFMA”)) or any Federal Reserve bank close early, trading on the NYSE is restricted, an emergency arises or as otherwise permitted by the SEC. The Funds reserve the right to continue to accept orders to purchase or redeem shares following the close of the NYSE on any day on which the NYSE closes early, provided that either the Federal Reserve or the bond markets remain open. In addition, the Board may, for any Business Day, decide to change the time as of which a Fund's NAV is calculated in response to new developments such as altered trading hours, or as otherwise permitted by the SEC.

The Federal Reserve is closed on certain holidays on which the NYSE is open. These holidays are Columbus Day and Veterans Day. On these holidays, you will not be able to purchase shares by wiring Federal Funds because Federal Funds wiring does not occur on days when the Federal Reserve is closed. In the event that the Funds invoke the right to accept orders to purchase or redeem shares on any day that is not a Business Day, the Funds will post advance notice of these events at: www.ssga.com.

Investing in State Street Institutional Investment Trust Shares

Requests for transactions in the State Street Funds will be processed when they are received in “good order.” “Good order” means that the request is in an accurate and complete form, and all applicable documents have been received in such accurate and complete form (including, typically, a signed application and medallion-guaranteed documents), and, for a purchase request, the check or wired funds have cleared.

Purchasing Shares

Investors pay no sales load to invest in shares of the Funds. The price for Fund Shares is the NAV per share. Purchase requests received by a Fund in good order (a purchase request is in good order if it meets the requirements implemented from time to time by the Transfer Agent or authorized agent of the Fund, and for new accounts includes submission of a completed and signed application and all documentation necessary to open an account) on a Business Day will, if payment is received by FedWire, be priced at the NAV next determined after the order is accepted by the Fund. Payments received by FedWire prior to the last Valuation Time will earn dividend accrual for that purchase.

All purchases that are made by check will begin earning dividends the following Business Day after the day the order is accepted. (If you purchase shares by check, your order will not be in good form until the Transfer Agent receives federal funds for the check.) All purchase orders are subject to acceptance by the Funds. The Funds intend to be as fully invested as is practicable; therefore, investments must be made in Federal Funds (i.e., monies credited to the account of the Funds' custodian bank by a Federal Reserve Bank).

Neuberger Berman is responsible for transmitting your purchase request and funds in good form and in a timely manner to the applicable Fund(s). A Fund will not be responsible for delays by Neuberger Berman in transmitting your purchase request, including timely transfer of payment, to the Fund.

The Funds reserve the right to cease accepting investments at any time or to reject any investment order. In addition, the Funds may limit the amount of a purchase order received after 3:00 p.m. ET.

How to Purchase Shares

By Mail:

An initial investment in the Funds must be preceded or accompanied by a completed, signed Neuberger

Berman Fund Application Form, sent to:

Neuberger Berman Funds

c/o State Street Institutional Trust Funds

State Street Global Advisors

801 Pennsylvania Avenue, Suite 219189

Kansas City, MO 64105-1307

Your first investment must be at least $2,000. Additional investments can be as little as $100. All checks must be

made out to “Neuberger Berman Funds”. Neuberger Berman will not accept checks made out to you or other

parties and signed over to it. Neuberger Berman cannot accept cash, money orders, starter checks, cashier's

checks, traveler's checks or other cash equivalents. You will be responsible for any losses or fees resulting from a

bad check. If necessary, Neuberger Berman may effect sales of Fund shares belonging to you in order to cover

these losses.

By Telephone:

An initial investment in the Funds must be preceded or accompanied by a completed, signed Neuberger

Berman Fund Application Form. Neuberger Berman does not accept phone orders for a first investment. To add

shares to an existing account using FUNDfone®», call (800) 335-9366.

Additional shares will be purchased when your order is accepted by the Funds. Additional investments must be

for at least $100.

For your initial investment, send the original, signed Neuberger Berman Account Application Form to the address

above.

Wire Instructions:

Before wiring any money, call (800) 877-9700 for an order confirmation. Please have your financial institution

send your wire to Neuberger Berman's account at State Street Bank and Trust Company and include your name,

the Fund name, your account number and other information as requested.

State Street Bank/Boston

ABA# 011-000028

Attn: NB Deposit Account

DDA#9904-199-8

On Columbus Day and Veterans Day, you will not be able to purchase shares by wiring Federal Funds because the

Federal Funds wiring does not occur on those days. Payment for Fund Shares must be in Federal Funds (or

converted to Federal Funds by the Transfer Agent) by the close of the Federal Reserve.

By Internet:

You may place an order with Neuberger Berman to purchase shares for your account by placing an order

online at www.nb.com.

You will not be able to redeem shares from the account until the original Application has been

received. The Funds and the Funds' agents are not responsible for transfer errors by the sending or receiving bank

and will not be liable for any loss incurred due to a wire transfer not having been received.

In accordance with certain federal regulations, Neuberger Berman is required to obtain, verify and record information that identifies each entity that applies to open an account. For this reason, when you open (or change ownership of) an account, Neuberger Berman will request certain information, including your name, residential/business address, date of birth (for individuals) and taxpayer identification number or other government identification number and other information that will allow us to identify you which will be used to verify your identity. Neuberger Berman may also request to review other identification documents such as driver license, passport or documents showing the existence of the business entity. If you do not provide sufficient information to verify your identity, Neuberger Berman will not open an account for you. As required by law, Neuberger Berman may employ various procedures, such as comparing your information to fraud databases or requesting additional information and documentation from you, to ensure that the information supplied by you is correct. Neuberger Berman reserves the right to reject any purchase for any reason, including failure to provide the Trust with information necessary to confirm your identity as required by law.

Redeeming Shares

An investor may redeem all or any portion of its investment. Redemption orders are processed at the NAV next determined after a Fund receives a redemption order in good form to Neuberger Berman.

If Neuberger Berman receives a redemption order in good form prior to 4:30 p.m. Eastern Time on a Business Day, shares are redeemed and Neuberger Berman typically expects to pay out redemption proceeds on that day, but no later than the next Business Day, if redemption proceeds are sent by wire or ACH. No dividends will be paid on shares that are redeemed and wired the same day. If redemption proceeds are sent by check, Neuberger Berman typically expects to pay out redemption proceeds on the next Business Day. If a full redemption order is requested, no dividends will accrue with respect to shares on the day the redemption proceeds are sent. If a redemption order is placed after 4:30 p.m. Eastern Time, Neuberger Berman typically expects to pay out the redemption proceeds for the shareholder the next Business Day (and dividends will accrue up to, but not including, the day that redemption proceeds are sent). Each Fund reserves the right to pay for redeemed shares within seven days after receiving a redemption order if, in the judgment of the Adviser, an earlier payment could adversely affect the Fund.

For All Funds

Rule 2a-7 as adopted by the SEC permits a money market fund to impose a liquidity fee upon the sale of fund shares under certain circumstances, however the U.S. Government Fund and the Treasury Plus Fund are both government money market funds that have not elected to be subject to the liquidity fee provision of Rule 2a-7. The right of any investor to receive payment with respect to any redemption may be suspended or the payment of the redemption proceeds postponed in accordance with Section 22(e) of the 1940 Act and the rules thereunder, including during any period in which the NYSE is closed (other than weekends or holidays) or trading on the NYSE is restricted or if an emergency exists as a result of which disposal by the Fund of securities owned by it is not reasonably practicable or it is not reasonably practicable for the Fund fairly to determine the value of its net assets. In addition, the SEC may by order permit suspension of redemptions for the protection of shareholders of the Fund. Although each Fund attempts to maintain its NAV at $1.00 per share, there can be no assurance that it will be successful, and there can be no assurance that a shareholder will receive $1.00 per share upon any redemption.

When selling shares in an account that you do not intend to close, remember to leave at least $2,000 worth of shares in the account. Otherwise, Neuberger Berman has the right to request that you bring the balance back up to the minimum level. If you have not done so within 60 days, Neuberger Berman may close your account and redeem the proceeds. Neuberger Berman is responsible for transmitting your redemption request in good form and in a timely manner to the applicable Fund(s). A Fund will not be responsible for delays by Neuberger Berman in transmitting your redemption request to the Fund.

How to Redeem Shares


By Mail:	Send a signed letter to: Neuberger Berman Funds c/o State Street Bank & Trust Co. 801 Pennsylvania Avenue Suite 219189 Kansas City, MO 64105-1307
	The letter should include information necessary to process your request as described below. The Fund may require a medallion guarantee in certain circumstances. See “Medallion Guarantees” below.
By Telephone:	Please call Neuberger Berman at (800) 877-9700 between the hours of 9:00 a.m. and 4:30 p.m. ET.
You must provide the following information: ➢ name(s) of account owners; ➢ account number(s); ➢ the name of the Fund; ➢ the dollar amount, percentage or number of shares being redeemed; and ➢ any other instructions. To place an order using FUNDfone®», call (800) 335-9366.
By Internet:	You may instruct Neuberger Berman to redeem shares by placing an order online at www.nb.com.

On any day that the Funds calculate NAV earlier than normal, the Funds reserve the right to adjust the times noted above for purchasing and redeeming shares.

Medallion Guarantees. You may need a Medallion signature guarantee when you sell shares of a Fund. A Medallion signature guarantee is a guarantee that your signature is authentic. Most banks, brokers and other financial institutions can provide you with one. Some may charge a fee; others may not, particularly if you are a customer of theirs.

Medallion signature guarantees are required for a variety of transactions including requests for changes to your account or to the instructions for distribution of proceeds. Neuberger Berman reserves the right to require a Medallion signature guarantee on any transaction at our discretion.

A notarized signature from a notary public is not a Medallion signature guarantee.

Exchanging Shares. You can move an investment from a Fund to a comparable class of another Neuberger Berman Fund in the Fund family through an exchange of shares, or by electing to use your cash distributions from a Fund to purchase shares of the other Fund. There are three things to remember when making an exchange:

•

both accounts must have the same registration;

•

you will need to observe the minimum account balance requirements for the fund accounts involved; and

•

because an exchange is treated as a sale for tax purposes, consider any tax consequences before placing your order.

Privileges and Services. You have access to a range of Neuberger Berman services to make investing easier:

Systematic Withdrawals. This plan lets you arrange withdrawals of at least $100 from a Fund on a periodic schedule. You can also set up payments to distribute the full value of an account over a given time.

Electronic Bank Transfers. When you sell Fund shares, you can have the money sent to your bank account electronically rather than mailed to you as a check. Please note that your bank must be a member of the Automated Clearing House, or ACH, system.

Internet Access. At www.nb.com, you can initiate transactions, check your account and access a wealth of information.

FUNDfone®. Get up-to-date performance and account information through our 24-hour automated service by calling (800) 335-9366. If you already have a Neuberger Berman fund account, you can place orders to buy, sell or exchange fund shares.

Checkwriting. If you would like to write checks against your Institutional U.S. Government Money Market Fund account, please call (800) 877-9700. Withdrawals must be for at least $250.

About Mail Transactions. If you choose to purchase, exchange or redeem shares by sending instructions by regular mail, they will not be deemed received in good order until they are released by the post office and redelivered to the Transfer Agent's physical location at 801 Pennsylvania Avenue, Suite 219189 in Kansas City, MO 64105-1307. There will be a time lag, which may be one or more days, between regular mail receipt at the post office box and redelivery to such physical location in Kansas City, and a Fund's NAV may change over those days. You might consider using express rather than regular mail if you believe the time of receipt of your transaction request to be sensitive.

Other Policies. Under certain circumstances, Neuberger Berman reserves the right to:

•

reject any exchange or purchase order;

•

suspend or reject any future purchase order from any investor who does not provide payment to settle a purchase order;

•

change, suspend or revoke the exchange privilege; and

•

suspend the telephone order privilege.

Unclaimed Property

Many states have unclaimed property rules that provide for transfer to the state (also known as “escheatment”) of unclaimed property under various circumstances. These circumstances include inactivity (e.g., no owner-initiated contact for a certain period), returned mail (e.g., when mail sent to a shareholder is returned by the post office as undeliverable), or a combination of both inactivity and returned mail. If a Fund identifies property as unclaimed, it will attempt to contact the shareholder, but if that attempt is unsuccessful, the account may be considered abandoned and escheated to the state after the passage of a certain period of time (as required by applicable state law).

If you are a resident of the state of Texas, you may designate a representative to receive escheatment notifications by completing and submitting a designation form, which you can find on the website of the Texas Comptroller. Designating such a representative may be beneficial, since Texas law provides that the escheatment period will cease if the representative, after receiving an escheatment notification regarding your account, communicates knowledge of your location and confirms that you have not abandoned your account. You can mail a completed designation form to the Fund (if you hold shares directly with the Fund) or to your financial intermediary (if you do not hold shares directly with the Fund).

Excessive Trading

attempt to discourage such excessive trading, there can be no guarantee that they will be able to identify investors who are engaging in excessive trading or limit their trading practices. Additionally, frequent trades of small amounts may not be detected. The Funds recognize that they may not always be able to detect or prevent excessive trading or other activity that may disadvantage the Funds or their shareholders.

Dividends, Distributions and Tax Considerations

An additional 3.8% Medicare contribution tax is imposed on the “net investment income” of individuals, estates and trusts to the extent their income exceeds certain threshold amounts. Net investment income generally includes for this purpose dividends paid by a Fund and net gains recognized on the redemption (or other taxable disposition) of Fund Shares.

Financial Intermediary Arrangements

Payments to Financial Intermediaries

Financial Highlights

The financial highlight tables are intended to help you understand each Fund's financial performance since inception of Institutional Class shares. Certain information reflects the performance results for a single Fund Share. The total returns in the table represent the rate that an investor would have earned (or lost) on an investment in each Fund (assuming reinvestment of all dividends and distributions). This information has been audited by Ernst & Young LLP, the Trust's independent registered public accounting firm, whose report, along with each Fund's financial highlights and financial statements, are included in each Fund's Form N-CSR filing, which is available upon request. Any references to Notes in these financial highlight tables refer to the “Notes to Financial Statements” section of each Fund's financial statements, and the financial information included in these tables should be read in conjunction with the financial statements incorporated by reference in the SAI.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL U.S. GOVERNMENT MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Institutional Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Income (loss) from investment operations:
Net investment income (loss)	0.0508	0.0491	0.0156	0.0001	0.0037
Net realized gain (loss)	(0.0000 )(b)	0.0000 (b)	0.0000 (b)	—	0.0000 (b)
Total from investment operations	0.0508	0.0491	0.0156	0.0001	0.0037
Distributions to shareholders from:
Net investment income	(0.0508 )	(0.0491 )	(0.0156 )	(0.0001 )	(0.0037 )
Net asset value, end of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Total return (c)	5.21 %	5.04 %	1.58 %	0.03 %	0.37 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$11,874,488	$10,784,799	$3,373,375	$1,588,396	$1,349,398
Ratios to Average Net Assets:
Total expenses	0.14 %	0.15 %	0.15 %	0.15 %	0.15 %
Net expenses	0.14 %	0.15 %	0.14 %	0.04 %	0.14 %
Net investment income (loss)	5.07 %	5.08 %	2.06 %	0.03 %	0.42 %

(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL TREASURY PLUS MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Institutional Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20
Net asset value, beginning of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Income (loss) from investment operations:
Net investment income (loss)	0.0508	0.0492	0.0157	0.0001	0.0037
Net realized gain (loss)	(0.0000 )(b)	0.0000 (b)	—	—	—
Total from investment operations	0.0508	0.0492	0.0157	0.0001	0.0037
Distributions to shareholders from:
Net investment income	(0.0508 )	(0.0492 )	(0.0157 )	(0.0001 )	(0.0037 )
Net asset value, end of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Total return (c)	5.20 %	5.03 %	1.58 %	0.02 %	0.37 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$5,968,988	$3,278,847	$2,122,508	$278,027	$90,569
Ratios to Average Net Assets:
Total expenses	0.14 %	0.14 %	0.15 %	0.15 %	0.15 %
Net expenses	0.14 %	0.14 %	0.15 %	0.06 %	0.15 %
Net investment income (loss)	5.01 %	5.00 %	2.57 %	0.02 %	0.34 %

(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.

For more information about the Funds:

The Funds' SAI includes additional information about the Funds and is incorporated by reference into this document. Additional information about the Funds' investments is available in the Funds' most recent annual and semi-annual reports to shareholders and in each Fund's Form N-CSR filing. In a Fund's Form N-CSR, you will find the Fund's annual and semi-annual financial statements. The Funds' SAI is available, without charge, upon request. The Funds' annual and semi-annual reports are available, without charge, upon request. Shareholders in the Funds may make inquiries to the Funds to receive such information by calling (877) 521-4083 or the customer service center at the telephone number shown in the accompanying contract prospectus, if applicable. Each Fund's Prospectus, SAI, annual and semi-annual reports to shareholders and other information such as each Fund's financial statements are available, free of charge, on the Funds' website at www.ssga.com.

SSGA Funds Management, Inc

ONE IRON STREET

BOSTON, MASSACHUSETTS 02210

00312915The State Street Institutional Investment Trust's Investment Company Act File Number is 811-09819.

Prospectus

April 30, 2025

State Street Institutional
Investment Trust

State Street Treasury Obligations Money Market Fund (TAQXX)

The U.S. Securities and Exchange Commission has not approved or disapproved these securities or passed upon the adequacy of this Prospectus. Any representation to the contrary is a criminal offense.

An investment in the Fund offered by this Prospectus is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

TABLE OF CONTENTS

Fund Summary	1
State Street Treasury Obligations Money Market Fund	1
Additional Information About Investment Objective, Principal Strategies and Risks	6
Additional Information About Non-Principal Investment Strategies and Risks	11
Portfolio Holdings Disclosure	12
Management and Organization	13
Shareholder Information	15
Dividends, Distributions and Tax Considerations	20
Financial Intermediary Arrangements	22
Financial Highlights	25

State Street Treasury Obligations Money Market Fund

Investment Objective

The investment objective of State Street Treasury Obligations Money Market Fund (the “Treasury Obligations Fund” or sometimes referred to in context as the “Fund”) is to seek a high level of current income consistent with preserving principal and liquidity and the maintenance of a stable $1.00 per share net asset value (“NAV”).

Fees and Expenses of the Fund

The tables below describe the fees and expenses that you may pay if you buy, hold, and sell shares of the Treasury Obligations Fund (“Fund Shares”). You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. The expenses shown in the table and the Example reflect the expenses of the Fund and the Fund's proportionate share of the expenses of the State Street Treasury Plus Money Market Portfolio (the “Treasury Plus Portfolio” or sometimes referred to in context as the “Portfolio”).

Shareholder Fees (fees paid directly from your investment)

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Management Fee	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%
Other Expenses	0.07%
Total Annual Fund Operating Expenses	0.12%
Less Fee Waivers and/or Expense Reimbursements1	(0.02%)
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements1	0.10%

The Fund's investment adviser, SSGA Funds Management, Inc. (the “Adviser” or “SSGA FM”), is contractually obligated until April 30, 2026 (i) to waive up to the full amount of the advisory fee payable by the Fund, and/or (ii) to reimburse the Fund to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, and extraordinary expenses) exceed 0.10% of average daily net assets on an annual basis. This waiver and/or reimbursement may not be terminated prior to April 30, 2026 except with approval of the Fund's Board of Trustees.

Example:

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated, and then sell or hold all of your Fund Shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. The calculation of costs for the one-year periods takes into account the effect of the current contractual fee waivers and/or reimbursements. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

1 year	3 years	5 years	10 years
$10	$37	$66	$152

Principal Investment Strategies

floating rate securities that may have final maturities longer than 397 days but use maturity shortening provisions to meet the 397 day requirement, and that the Fund believes present minimal credit risk), to maintain a maximum dollar-weighted average maturity and dollar-weighted average life of sixty (60) days or less and 120 days or less, respectively, and to meet requirements as to portfolio diversification and liquidity.

The Fund seeks to achieve its investment objective by investing substantially all of its investable assets in the Treasury Plus Portfolio, which has substantially identical investment policies to the Fund. When the Fund invests in this “master-feeder” structure, the Fund's only investments are shares of the Treasury Plus Portfolio, and it participates in the investment returns achieved by the Treasury Plus Portfolio. Descriptions in this section of the investment activities of the “Fund” also generally describe the expected investment activities of the Treasury Plus Portfolio.

Principal Risks

Market Risk: The Fund's investments are subject to changes in general economic conditions, general market fluctuations and the risks inherent in investment in securities markets. Investment markets can be volatile and prices of investments can change substantially due to various factors, including, but not limited to, economic growth or recession, changes in interest rates, inflation, changes in the actual or perceived creditworthiness of issuers, and general market liquidity. The Fund is subject to the risk that geopolitical events will disrupt securities markets and adversely affect global economies and markets. Local, regional or global events such as war, military conflicts, acts of terrorism, trade policy changes or disputes, the threat or actual imposition of tariffs, natural disasters, the spread of infectious illness or other public health issues, or other events could have a significant impact on the Fund and its investments.

Performance

The bar chart and table below provide some indication of the risks of investing in the Treasury Obligations Fund by illustrating the variability of the Fund's returns from year-to-year. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (877) 521-4083 or by visiting our website at www.ssga.com.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	1.35%	Q4 2023
Lowest Quarterly Return	0.01%	Q3 2021

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Since Inception
	One Year	Five Years	10/5/2017
State Street Treasury Obligations Money Market Fund	5.26 %	2.47 %	2.28 %

To obtain the Fund's current yield, please call (877) 521-4083.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

To establish an account	$1,000,000,000
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

You may purchase or redeem Fund Shares by written request or wire transfer. Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Telephone:

By Intermediary:

Financial Intermediaries may contact SS&C GIDS, Inc. at (877) 332-6207 or via email at nsccresearch@dstsystems.com with questions.

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

Additional Information About Investment Objective, Principal Strategies and Risks

Investment Objective

The Board of Trustees (the “Board” and each member thereof, a “Trustee”) may change the Fund's investment objective without shareholder approval.

Principal Investment Strategies

The Fund is a government money market fund and attempts to meet its investment objective by investing only in U.S. Treasury bills, notes and bonds (which are direct obligations of the U.S. government) and repurchase agreements collateralized by these obligations. The Fund will provide shareholders with at least sixty (60) days' prior notice of any change in this investment policy. The Fund may hold a portion of its assets in cash pending investment, to satisfy redemption requests or to meet the Fund's other cash management needs. The Fund invests in accordance with regulatory requirements applicable to money market funds, which require, among other things, the Fund to invest only in short-term securities (generally, securities that have remaining maturities of 397 calendar days or less, with the exception of certain floating rate securities that may have final maturities longer than 397 days but use maturity shortening provisions to meet the 397 day requirement, and that the Fund believes present minimal credit risk), to maintain a maximum dollar-weighted average maturity and dollar-weighted average life of sixty (60) days or less and 120 days or less, respectively, and to meet requirements as to portfolio diversification and liquidity.

The Fund seeks to achieve its investment objective by investing substantially all of its investable assets in the Treasury Plus Portfolio, which has substantially identical investment policies to the Fund. When the Fund invests in this “master-feeder” structure, the Fund's only investments are shares of the Treasury Plus Portfolio, and it participates in the investment returns achieved by the Treasury Plus Portfolio. Descriptions in this section of the investment activities of the “Fund” also generally describe the expected investment activities of the Treasury Plus Portfolio.

Additional Information About Risks

The Fund is subject to the following principal risks. The risks are described in alphabetical order and not in the order of importance or potential exposure.

Credit Risk. Credit risk is the risk that an issuer, guarantor or liquidity provider of a fixed-income security held by the Fund may be unable or unwilling, or may be perceived (whether by market participants, ratings agencies, pricing services or otherwise) as unable or unwilling, to make timely principal and/or interest payments, or to otherwise honor its obligations. It includes the risk that the security will be downgraded by a credit rating agency; generally, lower credit quality issuers present higher credit risks. An actual or perceived decline in creditworthiness of an issuer of a fixed-income security held by the Fund may result in a decrease in the value of the security. It is possible that the ability of an issuer to meet its obligations will decline substantially during the period when the Fund owns securities of the issuer or that the issuer will default on its obligations or that the obligations of the issuer will be limited or restructured.

The credit rating assigned to any particular investment does not necessarily reflect the issuer's current financial condition and does not reflect an assessment of an investment's volatility or liquidity. Securities rated in the lowest category of investment-grade are considered to have speculative characteristics. If a security held by the Fund loses its rating or its rating is downgraded, the Fund may nonetheless continue to hold the security in the discretion of the Adviser. In the case of asset-backed or mortgage-related securities, changes in the actual or perceived ability of the obligors on the underlying assets or mortgages to make payments of interest and/or principal may affect the values of those securities.

Debt Securities Risk. The values of debt securities may increase or decrease as a result of the following: market fluctuations, changes in interest rates, actual or perceived inability or unwillingness of issuers, guarantors or liquidity providers to make scheduled principal or interest payments or illiquidity in debt securities markets. To the extent that interest rates rise, certain underlying obligations may be paid off substantially slower than originally anticipated and the value of those securities may fall sharply. A rising interest rate environment may cause the value of the Fund's fixed income securities to decrease, an adverse impact on the liquidity of the Fund's fixed income securities, and increased volatility of the fixed income markets. During periods when interest rates are at low levels, the Fund's yield can be low, and the Fund may have a negative yield (i.e., it may lose money on an operating basis). To the extent that interest rates fall, certain underlying obligations may be paid off substantially faster than originally anticipated. If the principal on a debt obligation is prepaid before expected, the prepayments of principal may have to be reinvested in obligations paying interest at lower rates. During periods of falling interest rates, the income received by the Fund may decline. Changes in interest rates will likely have a greater effect on the values of debt securities of longer durations. Returns on investments in debt securities could trail the returns on other investment options, including investments in equity securities. High levels of inflation and/or a significantly changing interest rate environment can lead to heightened levels of volatility and reduced liquidity.

Interest Rate Risk. Interest rate risk is the risk that the securities held by the Fund will decline in value because of increases in market interest rates. Duration is a measure used to determine the sensitivity of a security's price to changes in interest rates. Debt securities with longer durations tend to be more sensitive to changes in interest rates, usually making them more volatile than debt securities with shorter durations. For example, the value of a security with a duration of five years would be expected to decrease by 5% for every 1% increase in interest rates. Falling interest rates also create the potential for a decline in the Fund's income and yield. Interest-only and principal-only securities are especially sensitive to interest rate changes, which can affect not only their prices but can also change the income flows and repayment assumptions about those investments. Variable and floating rate securities also generally increase or decrease in value in response to changes in interest rates, although generally to a lesser degree than fixed-rate securities. A substantial increase in interest rates may also have an adverse impact on the liquidity of a security, especially those with longer durations. Changes in governmental policy, including changes in central bank monetary policy, could cause interest rates to rise rapidly, or cause investors to expect a rapid rise in interest rates. This could lead to heightened levels of interest rate, volatility and liquidity risks for the fixed income markets generally and could have a substantial and immediate effect on the values of the Fund's investments. High levels of inflation and/or a significantly changing interest rate environment can lead to heightened levels of volatility and reduced liquidity.

able income and/or gains resulting from large shareholder transactions would particularly impact non-redeeming shareholders who do not hold their Fund shares in an IRA, 401(k) plan or other tax-advantaged plan. To the extent that such transactions result in short-term capital gains, such gains will generally be taxed at the ordinary income tax rate for shareholders who hold Fund shares in a taxable account. In addition, the Portfolio or the Fund may be required to sell its more liquid portfolio investments to meet a large redemption, in which case the Fund's remaining assets may be less liquid, more volatile, and more difficult to price. The Portfolio or Fund may hold a relatively large proportion of its assets in cash in anticipation of large redemptions, diluting its investment returns. A number of circumstances may cause the Portfolio or the Fund to experience large redemptions, such as changes in investors' circumstances; changes in the eligibility criteria for the Portfolio or the Fund or share class of the Fund; liquidations, reorganizations, repositionings, or other announced Portfolio or Fund events; or changes in investment objectives, strategies, policies, risks, or investment personnel.

Low Short-Term Interest Rate Risk. During market conditions in which short-term interest rates are at low levels, the Fund's yield can be very low. During these conditions, it is possible that the Fund will generate an insufficient amount of income to pay its expenses, and that it will not be able to pay a daily dividend and may have a negative yield (i.e., it may lose money on an operating basis). It is possible that the Fund would, during these conditions, maintain a substantial portion of its assets in cash, on which it may earn little, if any, income.

Securities and financial markets may be susceptible to market manipulation or other fraudulent trade practices, which could disrupt the orderly functioning of these markets or adversely affect the values of investments traded in these markets, including investments held by the Fund. To the extent the Fund has focused its investments in the market or index of a particular region, adverse geopolitical and other events could have a disproportionate impact on the Fund.

ments. Due to the interconnectedness of economies and financial markets throughout the world, if the Fund invests in securities of issuers located in or with significant exposure to countries experiencing economic and financial difficulties, the value and liquidity of the Fund's investments may be negatively affected. A widespread outbreak of an infectious illness and efforts to contain its spread, may result in market volatility, inflation, reduced liquidity of certain instruments, disruption in the trading of certain instruments, and systemic economic weakness. The foregoing could impact the Fund and its investments and result in disruptions to the services provided to the Fund by its service providers.

Market Volatility; Government Intervention Risk. Market dislocations and other external events, such as the failures or near failures of significant financial institutions, dislocations in investment or currency markets, corporate or governmental defaults or credit downgrades, or poor collateral performance, may subject the Fund to significant risk of substantial volatility and loss. Governmental and regulatory authorities have taken, and may in the future take, actions to provide or arrange credit supports to financial institutions whose operations have been compromised by credit market dislocations and to restore liquidity and stability to financial systems in their jurisdictions; the implementation of such governmental interventions and their impact on both the markets generally and the Fund's investment program in particular can be uncertain. Governmental and non-governmental issuers may default on, or be forced to restructure, their debts, and other issuers may face difficulties obtaining credit. Defaults or restructurings by governments or others of their debts could have substantial adverse effects on economies, financial markets, and asset valuations around the world. Federal Reserve or other U.S. or non-U.S. governmental or central bank actions, including interest rate increases or contrary actions by different governments, or investor perception that these efforts are not succeeding, could negatively affect financial markets generally as well as the values and liquidity of certain securities.

Money Market Fund Regulatory Risk. Money market funds and the securities they invest in are subject to comprehensive regulations. The SEC has adopted amendments to money market fund regulation that, among other things, increase the daily and weekly liquid asset requirements (“Money Market Fund Reform”). Money Market Fund Reform permits government money market funds (such as the Fund), that are experiencing a negative gross yield as a result of negative interest rates, to either convert from a stable share price to a floating share price or reduce the number of shares outstanding to maintain a stable net asset value per share, subject to certain Board determinations and disclosures to investors. The SEC and other government agencies continue to review the regulation of money market funds and may implement additional regulatory changes in the future. The enactment of any new legislation or regulations impacting the money market fund industry could limit the Fund's investment flexibility and reduce its ability to generate returns.

however the Treasury Obligations Fund is a government money market fund that has not elected to be subject to the liquidity fee provision of Rule 2a-7. None of State Street Corporation, State Street, State Street Global Advisors, SSGA FM or their affiliates (collectively, the “State Street Entities”) guarantee the value of an investment in a money market fund at $1.00 per share. Investors should have no expectation of capital support to a money market fund from the State Street Entities.

Repurchase Agreement Risk. A repurchase agreement is an agreement to buy a security from a seller at one price and a simultaneous agreement to sell it back to the original seller at an agreed-upon price, typically representing the purchase price plus interest. Repurchase agreements may be viewed as loans made by the Fund, which are collateralized by the securities subject to repurchase. The Fund's investment return on such transactions will depend on the counterparty's willingness and ability to perform its obligations under a repurchase agreement. If the Fund's counterparty should default on its obligations and the Fund is delayed or prevented from recovering the collateral, or if the value of the collateral is insufficient, the Fund may realize a loss.

U.S. Treasury Obligations Risk. U.S. Treasury obligations may differ from other securities in their interest rates, maturities, times of issuance and other characteristics. Similar to other issuers, changes to the financial condition or credit rating of the U.S. government may cause the value of the Fund's U.S. Treasury obligations to decline. The total public debt of the United States as a percentage of gross domestic product grew rapidly after the financial crisis of 2008 and has remained at a historically high level. Although high debt levels do not necessarily indicate or cause economic problems, they may create certain systemic risks if sound debt management practices are not implemented. A high national debt level may increase market pressures to meet government funding needs, which may drive debt cost higher and cause a country to sell additional debt, thereby increasing refinancing risk. A high national debt also raises concerns that a government will not be able to make principal or interest payments when they are due. In the worst case, unsustainable debt levels can cause a decline in the value of the dollar (which may lead to inflation), and can prevent the U.S. government from implementing effective countercyclical fiscal policy in economic downturns. On August 5, 2011, Standard & Poor's Ratings Services downgraded U.S. Treasury securities from AAA rating to AA+ rating. Standard & Poor's Ratings Services stated that its decision was prompted by its view on the rising public debt burden and its perception of greater policymaking uncertainty. Fitch also downgraded its rating of U.S. Treasury securities from AAA to AA+ in August 2023 citing increasing government debt and erosion in confidence regarding governance of fiscal matters as a result of repeated political standoffs related to debt limit approvals. A downgrade of the ratings of U.S. government debt obligations, which are often used as a benchmark for other borrowing arrangements, could result in higher interest rates for individual and corporate borrowers, cause disruptions in the international bond markets and have a substantial negative effect on the U.S. economy. Any additional downgrades of U.S. Treasury securities from ratings agencies may cause the value of the Fund's U.S. Treasury obligations to decline. In recent years, impasses in Congress regarding the federal budget have caused temporary Federal government shutdowns. While Congress has temporarily suspended the debt limit from time to time, the risks that the U.S. government will not adopt a long-term budget or deficit reduction plan, of one or more additional Federal government shutdowns or of future failures to not increase the Federal government's debt limit, may affect investor and consumer confidence and may adversely impact financial markets and the broader economy, perhaps suddenly and to a significant degree.

the changes in market rates or may have limits on the maximum increases in coupon rates. Alternatively, during periods of declining interest rates, the coupon rates on such securities will typically readjust downward resulting in a lower yield. The Fund may also invest in variable or floating rate equity securities, whose dividend payments vary based on changes in market rates of interest or other factors.

Additional Information About Non-Principal Investment Strategies and Risks

The investments described below reflect the Fund's and the Treasury Plus Portfolio's current practices. In addition to the principal risks described above, other risks are described in some of the descriptions of the investments below:

The Adviser and its affiliates serve as investment adviser to other clients and may make investment decisions that may be different from those that will be made by the Adviser on behalf of the Fund. For example, the Adviser may provide asset allocation advice to some clients that may include a recommendation to invest in or redeem from particular issuers while not providing that same recommendation to all clients invested in the same or similar issuers. The Adviser may (subject to applicable law) be simultaneously seeking to purchase (or sell) investments for the Fund and to sell (or purchase) the same investment for accounts, funds, or structured products for which it serves as asset manager, or for other clients or affiliates. The Adviser and its affiliates may invest for clients in various securities that are senior, pari passu or junior to, or have interests different from or adverse to, the securities that are owned by the Fund. The Adviser or its affiliates, in connection with its other business activities, may acquire material nonpublic confidential information that may restrict the Adviser from purchasing securities or selling securities for itself or its clients (including the Fund) or otherwise using such information for the benefit of its clients or itself.

systems, including the possibility that certain risks have not been identified, given the evolving nature of this threat. The use of artificial intelligence (“AI”) and machine learning could exacerbate these risks or result in cyber security incidents that implicate personal data. The Fund relies on third-party service providers for many of its day-to-day operations, and will be subject to the risk that the protections and protocols implemented by those service providers will be ineffective to protect the Fund from cyber-attack. The Adviser does not control the cybersecurity plans and systems put in place by third-party service providers, and such third-party service providers may have limited indemnification obligations to the Adviser or the Fund. Similar types of cybersecurity risks or technical malfunctions also are present for issuers of securities in which the Fund invests, which could result in material adverse consequences for such issuers, and may cause the Fund's investment in such securities to lose value.

Portfolio Holdings Disclosure

The Fund's portfolio holdings disclosure policy is described in the Statement of Additional Information (“SAI”).

Management and Organization

The Fund invests as part of a “master/feeder” structure. The Fund currently seeks to achieve its investment objective by investing substantially all of its investable assets in the Treasury Plus Portfolio, a separate mutual fund, that has substantially identical investment objective, investment policies, and risks as the Fund. All discussions about the Fund's investment objective, policies and risks should be understood to refer also to the investment objectives, policies and risks of the Treasury Plus Portfolio.

The Fund can withdraw its investment in the Portfolio if, at any time, the Board determines that it would be in the best interests of the Fund's shareholders, or if the investment objectives of the Treasury Plus Portfolio changed so that they were inconsistent with the objectives of the Fund. If the Fund withdraws its investment from the Portfolio, the Fund may invest all of its assets in another mutual fund that has the same investment objective as the Fund, the Adviser may directly manage the Fund's assets, or the Board may take such other action it deems appropriate and in the best interests of shareholders of the Fund, which may include liquidation of the Fund.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund and the Treasury Plus Portfolio pursuant to an investment advisory agreement (“Investment Advisory Agreement”) between the Trust and the Adviser, and, subject to the oversight of the Board, is responsible for the investment management of the Fund. The Adviser provides an investment management program for the Fund and manages the investment of the Fund's assets. In addition, the Adviser provides administrative, compliance and general management services to the Fund. The Adviser is a wholly-owned subsidiary of State Street Global Advisors, Inc., which itself is a wholly-owned subsidiary of State Street Corporation. The Adviser is registered with the SEC under the Investment Advisers Act of 1940, as amended. The Adviser and certain other affiliates of State Street Corporation make up SSGA. SSGA is one of the world's largest institutional money managers and the investment management arm of State Street Corporation. As of December 31, 2024, the Adviser managed approximately $1.11 trillion in assets and SSGA managed approximately $4.72 trillion in assets. The Adviser's principal business address is One Iron Street, Boston, Massachusetts 02210.

The Fund has entered into an investment advisory agreement with the Adviser pursuant to which the Adviser will manage the Fund's assets directly, for compensation paid at an annual rate of 0.05% of the Fund's average daily net assets, in the event that the Fund were to cease investing substantially all of its assets in the Treasury Plus Portfolio or another investment company with essentially the same investment objectives and policies as the Fund. The Adviser does not receive any management fees from the Fund under that agreement so long as the Fund continues to invest substantially all of its assets in the Treasury Plus Portfolio or in another investment company with essentially the same investment objectives and policies as the Fund. The Adviser places all orders for purchases and sales of the Portfolio's investments. For the year ended December 31, 2024, the effective management fee paid, reflecting certain fee waivers and expense reimbursements of the Adviser, was 0.05% for Treasury Plus Portfolio.

Total Annual Fund Operating Expense Waiver. SSGA FM, as the investment adviser to the Fund, is contractually obligated until April 30, 2026 (i) to waive up to the full amount of the advisory fee payable by the Fund and/or (ii) to reimburse the Fund for expenses to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, and extraordinary expenses) exceed 0.10% of average daily net assets on an annual basis (the “Total Annual Fund Operating Expense Waiver”). The Total Annual Fund Operating Expense Waiver may not be terminated prior to April 30, 2026 except with approval of the Board.

Voluntary Expense Waiver. Additionally, the Adviser has voluntarily agreed to waive its advisory fee and/or to reimburse the Fund for expenses to the extent that the Fund's total annual operating expenses exceed 0.08% of average daily net assets on an annual basis (the “Voluntary Expense Waiver”). The Adviser may discontinue the voluntary fee waiver and/or expense limitation arrangement at any time, in its sole discretion.

In addition to any contractual expense limitation for the Fund, which is described in the Fund Summary, each of the Adviser and State Street Global Advisors Funds Distributors, LLC (each a “Service Provider”) also may voluntarily reduce all or a portion of its fees and/or reimburse expenses for the Fund or a share class to the extent necessary to maintain a certain minimum net yield, which may vary from time to time, in SSGA FM's sole discretion (any such waiver or reim

bursement of expenses being referred to herein as a “Voluntary Reduction”). The Adviser may, in its sole discretion, implement the Voluntary Reduction for some Funds, or some share classes of a Fund, and not others. The amount of any Voluntary Reduction may differ between Funds and share classes in the Adviser's sole discretion. The business objectives of the Adviser and its affiliates and their broader relationships with certain Fund shareholders, Financial Intermediaries or distribution channels could give the Adviser an incentive to implement the Voluntary Reduction for some Funds or share classes and not others, or to implement it to a greater degree for some Funds or share classes than others. Under an agreement with the Service Providers relating to the Voluntary Reduction, A Fund is not obligated to reimburse a Service Provider: (1) more than three years after the end of the fiscal year of the Fund in which the Service Provider provided a Voluntary Reduction; (2) in respect of any business day for which the net annualized one day yield of the Fund or applicable Class is less than 0.00%; (3) to the extent that the amount of the reimbursement to all Service Providers on any day exceeds fifty percent of the yield (net of all expenses, exclusive of the reimbursement) of the Fund or the applicable class on that day; (4) to the extent that the amount of such reimbursement would cause the Fund's or applicable class's net yield to fall below the Fund's or applicable class's minimum yield; (5) in respect of any such fee waivers and/or expense reimbursements that are necessary to maintain the Fund's Contractual Total Expense Limit (as defined in the Reimbursement Agreement) which is effective at the time of such fee waivers and/or expense reimbursements; or (6) in any manner that would result in a class bearing the cost of a reimbursement to the Service Provider for any class-specific expense (including, without limitation, fees payable in accordance with a plan authorized pursuant to Rule 12b-1 under the 1940 Act, or Shareholder Servicing Agreement or similar arrangement) that was waived or reimbursed to the Fund with respect to a different Class, the Fund and the Portfolio have agreed to reimburse the Service Providers for the full dollar amount of any Voluntary Reduction beginning on May 1, 2020, subject to certain limitations. Each Service Provider may, in its sole discretion, irrevocably waive receipt of any or all reimbursement amounts due from the Fund.

A discussion regarding the Board's consideration of the Fund's Investment Advisory Agreement is provided in the Fund's Form N-CSR filing with the SEC for the period ended June 30, 2024.

The Administrator, Sub-Administrator and Custodian

The Adviser serves as administrator of the Fund. The amount of the fee paid to the Adviser for administrative services may vary by share class. The Fund currently pays the Adviser an administrative fee at the annual rate of 0.05%. State Street Bank and Trust Company (“State Street”), a subsidiary of State Street Corporation, serves as the sub-administrator for the Fund for a fee that is paid by the Adviser. State Street also serves as custodian of the Fund for a separate fee that is paid by the Fund. SSGA FM serves as administrator of the Portfolio and State Street serves as sub-administrator and custodian of the Portfolio.

The Transfer Agent and Dividend Disbursing Agent

SS&C GIDS, Inc. is the Fund's transfer agent and dividend disbursing agent (the “Transfer Agent”).

The Distributor

State Street Global Advisors Funds Distributors, LLC serves as the Fund's distributor (“SSGA FD”) pursuant to the Distribution Agreement between SSGA FD and the Trust.

Additional Information

Shareholder Information

Determination of Net Asset Value

Investing in State Street Institutional Investment Trust Shares

Purchasing Shares

Investors pay no sales load to invest in the Fund Shares. The price for Fund Shares is the NAV per share. Purchase requests received by the Fund in good order (a purchase request is in good order if it meets the requirements implemented from time to time by the Transfer Agent or authorized agent of the Fund, and for new accounts includes submission of a completed and signed application and all documentation necessary to open an account) on a Business Day will, if payment is received by FedWire, be priced at the NAV next determined after the order is accepted by the Fund. Payments received by FedWire prior to the last Valuation Times will earn dividend accrual for that purchase.

All purchases that are made by check will begin earning dividends the following Business Day after the day the order is accepted. (If you purchase shares by check, your order will not be in good form until the Transfer Agent receives federal funds for the check.) All purchase orders are subject to acceptance by the Fund. The Fund intends to be as fully invested as is practicable; therefore, investments must be made in Federal Funds (i.e., monies credited to the account of the Fund's custodian bank by a Federal Reserve Bank).

The minimum initial investment in the Fund is $1 billion, although the Adviser may waive the minimum in its discretion. Holdings of related customer accounts may be aggregated for purposes of determining the minimum investment amount. “Related customer accounts” may include, but are not limited to, accounts held by the same investment or retirement plan, financial institution, broker, dealer or intermediary. The Fund and the Adviser reserve the right to increase or decrease the minimum amount required to open or maintain an account. There is no minimum subsequent investment, except in relation to maintaining certain minimum account balances (See “Redeeming Shares” below). The Fund requires prior notification of subsequent investments in excess of $50 million. The Fund reserves the right to cease accepting investments at any time or to reject any investment order. The Fund may limit the amount of a purchase order received after 3:00 p.m. ET.

How to Purchase Shares

By Mail:

An initial investment in the Fund must be preceded or accompanied by a completed, signed Institutional Account

Application Form, sent to:

State Street Funds

P.O. Box 219737

Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds

801 Pennsylvania Avenue, Suite 219737

Kansas City, MO 64105-1307

By Telephone/Fax:

An initial investment in the Fund must be preceded or accompanied by a completed, signed Institutional Account

Application Form, faxed to (816) 218-0400. Call the Fund at (866) 392-0869 between the hours of 8:00 a.m. ET

and 6:00 p.m. ET to:

➢ confirm receipt of the faxed Institutional Account Application Form (initial purchases only),

➢ request your new account number (initial purchases only),

➢ confirm the amount being wired and wiring bank, and

➢ receive a confirmation number for your purchase order (your trade is not effective until you have received a

confirmation number from the Fund).

For your initial investment, send the original, signed Institutional Account Application Form to the address above.

Wire Instructions:

Instruct your bank to transfer money by Federal Funds wire to:

State Street Bank and Trust Company

1 Iron Street

Boston, MA 02210

ABA# 011000028

DDA# 9904-631-0

State Street Institutional Investment Trust

Fund Name

Account Number

Account Registration

On Columbus Day and Veterans Day, you will not be able to purchase shares by wiring Federal Funds because the

Federal Funds wiring does not occur on those days. Payment for Fund Shares must be in Federal Funds (or

converted to Federal Funds by the Transfer Agent) by the close of the Federal Reserve.

The Fund and the Fund's agents are not responsible for transfer errors by the sending or receiving bank and will

not be liable for any loss incurred due to a wire transfer not having been received.

Redeeming Shares

An investor may redeem all or any portion of its investment. Redemption orders are processed at the NAV next determined after the Fund receives a redemption order in good form.

If the Fund receives a redemption order in good form prior to 5:00 p.m. ET on a Business Day, the Fund typically expects to pay out redemption proceeds on that day, but no later than next Business Day if redemption proceeds are sent by wire or ACH. If redemption proceeds are sent by check, the Fund typically expects to pay out redemption proceeds on the next Business Day. If a redemption order is placed after 5:00 p.m. ET, the Fund typically expects to pay out redemption proceeds on the next Business Day (and dividends will accrue up to, but not including, the day that redemption proceeds are sent). The Fund reserves the right to pay for redeemed shares within seven days after receiving a redemption order if, in the judgment of the Adviser, an earlier payment could adversely affect the Fund.

Rule 2a-7 as adopted by the SEC permits a money market fund to impose a liquidity fee upon the sale of fund shares under certain circumstances, however the Fund is a government money market fund that has not elected to be subject to the liquidity fee provision of Rule 2a-7. The right of any investor to receive payment with respect to any redemption may be suspended or the payment of the redemption proceeds postponed in accordance with Section 22(e) of the 1940 Act and the rules thereunder, including during any period in which the NYSE is closed (other than weekends or holidays) or trading on the NYSE is restricted or if an emergency exists as a result of which disposal by the Fund of securities owned by it is not reasonably practicable or it is not reasonably practicable for the Fund fairly to determine the value of its net assets. In addition, the SEC may by order permit suspension of redemptions for the protection of shareholders of the Fund. Although the Fund attempts to maintain its NAV at $1.00 per share, there can be no assurance that it will be successful, and there can be no assurance that a shareholder will receive $1.00 per share upon any redemption.

A request for a partial redemption by an investor whose account balance is below the minimum amount or a request for partial redemption by an investor that would bring the account below the minimum amount may be treated as a request for a complete redemption of the account. These minimums may be different for investments made through certain financial intermediaries as determined by their policies and may be waived in the Adviser's discretion. The Fund reserves the right to modify minimum account requirements at any time with or without prior notice. The Fund also reserves the right to involuntarily redeem an investor's account if the investor's account balance falls below the applicable minimum amount due to transaction activity.

How to Redeem Shares


By Mail:	Send a signed letter to: State Street Institutional Investment Trust Funds P.O. Box 219737 Kansas City, MO 64121-9737
	The letter should include information necessary to process your request as described below. The Fund may require a medallion guarantee in certain circumstances. See “Medallion Guarantees” below.
By Overnight:	State Street Institutional Investment Trust Funds 801 Pennsylvania Avenue, Suite 219737 Kansas City, MO 64105-1307
By Telephone:	Please call (866) 392-0869 between the hours of 8:00 a.m. and 6:00 p.m. ET.
The Fund will need the following information to process your redemption request:
➢ name(s) of account owners; ➢ account number(s); ➢ the name of the Fund; ➢ your daytime telephone number; and ➢ the dollar amount or number of shares being redeemed.

On any day that the Fund calculates its NAV earlier than normal, the Fund reserves the right to adjust the times noted above for purchasing and redeeming shares.

Medallion Guarantees. Certain redemption requests must include a medallion guarantee for each registered account owner if any of the following apply:

•

Your account address has changed within the last 10 Business Days.

•

Redemption proceeds are being transferred to an account with a different registration.

•

A wire is being sent to a financial institution other than the one that has been established on your Fund account.

•

Other unusual situations as determined by the Transfer Agent.

The Fund may terminate the receipt of redemption orders by telephone at any time, in which case you may redeem shares by other means.

If you choose to purchase or redeem shares by sending instructions by regular mail, they will not be deemed received in good order until they are released by the post office and redelivered to the Transfer Agent's physical location at 801 Pennsylvania Avenue, Suite 219737 in Kansas City, MO 64105-1307. There will be a time lag, which may be one or more days, between regular mail receipt at the post office box and redelivery to such physical location in Kansas City, and the Fund's NAV may change over those days. You might consider using express rather than regular mail if you believe the time of receipt of your transaction request to be sensitive.

Exchanging Shares

Currently, exchanging shares from/to this Fund to any other State Street Fund is not permitted.

Excessive Trading

Delivery of Documents to Accounts Sharing an Address

To reduce expenses, we may mail only one copy of the Fund's Prospectus and the annual and semi-annual report to those addresses shared by two or more accounts. If you wish to receive individual copies of these documents, please call us at (866) 392-0869, or contact your financial institution. We will begin sending you individual copies thirty (30) days after receiving your request.

Unclaimed Property

Many states have unclaimed property rules that provide for transfer to the state (also known as “escheatment”) of unclaimed property under various circumstances. These circumstances include inactivity (e.g., no owner-initiated contact for a certain period), returned mail (e.g., when mail sent to a shareholder is returned by the post office as undeliverable), or a combination of both inactivity and returned mail. If a State Street Fund identifies property as unclaimed, it will attempt to contact the shareholder, but if that attempt is unsuccessful, the account may be considered abandoned and escheated to the state after the passage of a certain period of time (as required by applicable state law).

If you are a resident of the state of Texas, you may designate a representative to receive escheatment notifications by completing and submitting a designation form, which you can find on the website of the Texas Comptroller. Designating such a representative may be beneficial, since Texas law provides that the escheatment period will cease if the representative, after receiving an escheatment notification regarding your account, communicates knowledge of your location and confirms that you have not abandoned your account. You can mail a completed designation form to the Fund (if you hold shares directly with the Fund) or to your financial intermediary (if you do not hold shares directly with the Fund).

Dividends, Distributions and Tax Considerations

to receive them in cash. No interest will accrue on the amounts represented by uncashed distribution checks. If you have elected to receive distributions by check, and the postal or other delivery service is unable to deliver the checks because of an incorrect mailing address, or if a distribution check remains uncashed for six months, the uncashed distribution and all future distributions will be reinvested at the then-current NAV of the Fund.

The Fund invests substantially all of its investible assets in a Portfolio that is treated as a partnership for U.S. federal income tax purposes. The nature and character of the Fund's income, gains, losses and deductions generally will be determined at the Portfolio level, and the Fund will be allocated its share of the Portfolio's income, gains, losses and deductions. As applicable, references in this discussion to income, gains and losses of the Fund will be to income, gains and losses recognized and deductions accruing at the Portfolio level and allocated to or otherwise taken into account by the Fund, and references to assets of the Fund will be to the Fund's allocable share of the assets of the Portfolio.

If the NAV of Fund Shares were to vary from $1.0000 per share, shareholders generally would realize a gain or loss upon the redemption or other taxable disposition of such Fund Shares. Any such gain generally would be taxable to you as either short-term or long-term capital gain, depending upon how long you held the Fund Shares. The Internal Revenue Service (the “IRS”) has issued final regulations and published guidance that permit a simplified method of accounting for gains and losses realized upon the disposition of money market fund shares. Shareholders should see the SAI for further information.

An additional 3.8% Medicare contribution tax is imposed on the “net investment income” of individuals, estates and trusts to the extent their income exceeds certain threshold amounts. Net investment income generally includes for this purpose dividends paid by the Fund and net gains recognized on the redemption (or other taxable disposition) of Fund Shares.

Financial Intermediary Arrangements

Payments to Financial Intermediaries

The Financial Intermediary is often compensated by SSGA FD or its affiliates for the services it performs and in such cases is typically paid continually over time, during the period when the Financial Intermediary's clients hold investments in the Fund. The amount of continuing compensation paid by SSGA FD or its affiliates to different Financial Intermediaries for distribution and/or shareholder services varies. Any compensation is typically a percentage of the value of the Financial Intermediary's clients' investments in the Fund or a per account fee. The variation in compensation may, but will not necessarily, reflect enhanced or additional services provided by the Financial Intermediary.

If you invest through a Financial Intermediary and meet the eligibility criteria for more than one share class, you should discuss with your Financial Intermediary which share class is appropriate for you. Your financial adviser and the Financial Intermediary employing him or her may have an incentive to recommend one share class over another, when you are eligible to invest in more than one share class. Please speak with your financial adviser to learn more about the total amounts paid to your financial adviser and his or her firm by the Fund or its affiliates with respect to the different share classes offered by the Fund.

SSGA FD and its affiliates (including SSGA FM), at their own expense and out of their own assets, may also provide other compensation to Financial Intermediaries in connection with sales of the Fund's shares or the servicing of shareholders or shareholder accounts. Such compensation may include, but is not limited to, financial assistance to Financial Intermediaries in connection with conferences, sales, or training programs for their employees; seminars for the public; advertising or sales campaigns; or other Financial Intermediary-sponsored special events. In some instances, this compensation may be made available only to certain Financial Intermediaries whose representatives have sold or are expected to sell significant amounts of shares. Dealers may not use sales of the Fund's shares to qualify for this compensation to the extent prohibited by the laws or rules of any state or any self-regulatory agency, such as FINRA.

This Page Intentionally Left Blank

Financial Highlights

The financial highlight tables are intended to help you understand the Fund's financial performance since the Treasury Obligations Money Market Fund's inception. Certain information reflects the performance results for a single Fund Share. The total returns in the table represent the rate that an investor would have earned (or lost) on an investment in the Fund (assuming reinvestment of all dividends and distributions). This information has been audited by Ernst & Young LLP, the Trust's independent registered public accounting firm, whose report, along with the Fund's financial highlights and financial statements, are included in the Fund's Form N-CSR filing, which is available upon request. Any references to Notes in these financial highlight tables refer to the “Notes to Financial Statements” section of the Fund's financial statements, and the financial information included in these tables should be read in conjunction with the financial statements incorporated by reference in the SAI.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET TREASURY OBLIGATIONS MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period


	Year Ended 12/31/24 (a)	Year Ended 12/31/23 (a)	Year Ended 12/31/22 (a)	Year Ended 12/31/21 (a)	Year Ended 12/31/20 (a)
Net asset value, beginning of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Income (loss) from investment operations:
Net investment income (loss)	0.0514	0.0498	0.0162	0.0002	0.0045
Net realized and unrealized gain (loss)	(0.0000 )(b)	0.0000 (b)	—	(0.0001 )	(0.0001 )
Total from investment operations	0.0514	0.0498	0.0162	0.0001	0.0044
Distributions to shareholders from:
Net investment income	(0.0514 )	(0.0498 )	(0.0162 )	(0.0001 )	(0.0044 )
Net asset value, end of period	$1.0000	$1.0000	$1.0000	$1.0000	$1.0000
Total return (c)	5.26 %	5.10 %	1.64 %	0.02 %	0.44 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$4,942,726	$3,443,739	$6,254,220	$3,755,757	$2,753,990
Ratios to average net assets:
Total expenses	0.12 %	0.11 %	0.12 %	0.12 %	0.12 %
Net expenses	0.08 %	0.08 %	0.08 %	0.05 %	0.08 %
Net investment income (loss)	5.10 %	4.93 %	1.83 %	0.02 %	0.45 %

(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.

Contacting the State Street Funds

Online:	www.ssga.com	24 hours a day, 7 days a week
Phone:	(877) 521-4083	Monday – Friday 8:00 am – 6:00 pm EST

Written requests should be sent to:

Regular mail	Overnight/Registered, Express, Certified Mail
State Street Funds P.O. Box 219737 Kansas City, MO 64121-9737	State Street Funds 801 Pennsylvania Avenue, Suite 219737 Kansas City, MO 64105-1307

For more information about the Fund:

The Fund's SAI includes additional information about the Fund and is incorporated by reference into this document. Additional information about the Fund's investments is available in the Fund's most recent annual and semi-annual reports to shareholders and in the Fund's Form N-CSR filing. In the Fund's Form N-CSR, you will find the Fund's annual and semi-annual financial statements. The Fund's SAI is available, without charge, upon request. The Fund's annual and semi-annual reports are available, without charge, upon request. Shareholders in the Fund may make inquiries to the Fund to receive such information by calling (877) 521-4083 or the customer service center at the telephone number shown in the accompanying contract prospectus, if applicable. The Fund's Prospectus, SAI, annual and semi-annual reports to shareholders and other information such as the Fund's financial statements are available, free of charge, on the Fund's website at www.ssga.com.

SSGA Funds Management, Inc

ONE IRON STREET

BOSTON, MASSACHUSETTS 02210

TAQXXSTATPROThe State Street Institutional Investment Trust's Investment Company Act File Number is 811-09819.

Prospectus

April 30, 2025

State Street Institutional
Investment Trust

State Street Institutional Treasury Money Market Fund: Select Class (TYSXX)

State Street Institutional Treasury Plus Money Market Fund: Select Class (TPSXX)

State Street Institutional U.S. Government Money Market Fund: Select Class (GVSXX)

The U.S. Securities and Exchange Commission has not approved or disapproved these securities or passed upon the adequacy of this Prospectus. Any representation to the contrary is a criminal offense.

An investment in any of the Funds offered by this Prospectus is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Each Fund may offer multiple classes of shares. This Prospectus covers only the Select Class Shares of the Funds.

TABLE OF CONTENTS

Fund Summaries	1
State Street Institutional Treasury Money Market Fund	1
State Street Institutional Treasury Plus Money Market Fund	6
State Street Institutional U.S. Government Money Market Fund	11
Additional Information About Investment Objectives, Principal Strategies and Risks	17
Additional Information About Non-Principal Investment Strategies and Risks	24
Portfolio Holdings Disclosure	26
Management and Organization	27
Shareholder Information	29
Dividends, Distributions and Tax Considerations	35
Financial Highlights	37

State Street Institutional Treasury Money Market Fund

Investment Objective

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Management Fee	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%
Other Expenses1	0.06%
Total Annual Fund Operating Expenses	0.11%
Less Fee Waivers and/or Expense Reimbursements2	(0.03%)
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements2	0.08%

Other Expenses are based on estimates for the current fiscal year.

SSGA Funds Management, Inc. (the “Adviser” or “SSGA FM”), is contractually obligated until April 30, 2026 to reimburse the Fund for expenses to the extent that Total Annual Fund Operating Expenses (exclusive of interest, brokerage commissions, taxes, extraordinary expenses, deferred organizational expenses or acquired fund fees and expenses) of the Select Class shares of the Fund exceed 0.08% of average daily net assets on an annual basis. This reimbursement arrangement for Select Class shares of the Fund may not be terminated prior to April 30, 2026 except with approval of the Fund's Board of Trustees.

Example:

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated, and then sell or hold all of your Fund Shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. The calculation of costs for the one-year period takes into account the effect of any current contractual fee waivers and/or reimbursements, and the calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of each such period. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

1 year	3 years	5 years	10 years
$8	$32	$59	$138

Principal Investment Strategies

Principal Risks

Market Risk: The Fund's investments are subject to changes in general economic conditions, general market fluctuations and the risks inherent in investment in securities markets. Investment markets can be volatile and prices of investments can change substantially due to various factors, including, but not limited to, economic growth or recession, changes in interest rates, inflation, changes in the actual or perceived creditworthiness of issuers, and general market liquidity. The Fund is subject to the risk that geopolitical events will disrupt securities markets and adversely affect global economies and markets. Local, regional or global events such as war, military conflicts, acts of terrorism, trade policy changes or disputes, the threat or actual imposition of tariffs, natural disasters, the spread of infectious illness or other public health issues, or other events could have a significant impact on the Fund and its investments.

it may lose money on an operating basis). It is possible that the Fund would, during these conditions, maintain a substantial portion of its assets in cash, on which it may earn little, if any, income.

Performance

The bar chart and table below provide some indication of the risks of investing in the Treasury Fund by illustrating the variability of the Fund's returns for Premier Class shares from year-to-year. Performance history will be available for the Select Class shares of the Fund after they have been in operation for one calendar year. Returns of Select Class shares could have been similar to the returns shown for Premier Class shares because the shares are invested in the same portfolio of securities. Returns would differ only to the extent that Select Class shares do not have the same expenses as Premier Class shares. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (877) 521-4083 or by visiting our website at www.ssga.com.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	1.34%	Q4 2023
Lowest Quarterly Return	0.00%	Q1 2015

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Ten Years
Premier Class	5.21 %	2.39 %	1.67 %

To obtain the Fund's current yield, please call (877) 521-4083.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

Purchase and Sale of Fund Shares

Eligible investors of the Select Class shares of the Fund are limited to institutional entities that hold Fund Shares directly with the Fund. Select Class shares of the Fund generally are not offered to shareholders through a broker, bank or other financial intermediary (“Financial Intermediary”).

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Select Class
To establish an account	$750,000,000
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

You may purchase or redeem Fund Shares by written request or wire transfer. Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Telephone:

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

Select Class shares of the Fund generally are not offered for purchase through Financial Intermediaries.

State Street Institutional Treasury Plus Money Market Fund

Investment Objective

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Management Fee	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%
Other Expenses1	0.06%
Total Annual Fund Operating Expenses	0.11%
Less Fee Waivers and/or Expense Reimbursements2	(0.03%)
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements2	0.08%

Other Expenses are based on estimates for the current fiscal year.

Example:

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated, and then sell or hold all of your Fund Shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. The calculation of costs for the one-year period takes into account the effect of any current contractual fee waivers and/or reimbursements, and the calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of each such period. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

1 year	3 years	5 years	10 years
$8	$32	$59	$138

Principal Investment Strategies

Principal Risks

Market Risk: The Fund's investments are subject to changes in general economic conditions, general market fluctuations and the risks inherent in investment in securities markets. Investment markets can be volatile and prices of investments can change substantially due to various factors, including, but not limited to, economic growth or recession, changes in interest rates, inflation, changes in the actual or perceived creditworthiness of issuers, and general market liquidity. The Fund is subject to the risk that geopolitical events will disrupt securities markets and adversely affect global economies and markets. Local, regional or global events such as war, military conflicts, acts of terror

Performance

The bar chart and table below provide some indication of the risks of investing in the Treasury Plus Fund by illustrating the variability of the Fund's returns for Premier Class shares from year-to-year. Performance history will be available for the Select Class shares of the Fund after they have been in operation for one calendar year. Returns of Select Class shares could have been similar to the returns shown for Premier Class shares because the shares are invested in the same portfolio of securities. Returns would differ only to the extent that Select Class shares do not have the same expenses as Premier Class shares. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (877) 521-4083 or by visiting our website at www.ssga.com.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	1.34%	Q4 2023
Lowest Quarterly Return	0.00%	Q1 2015

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Ten Years
Premier Class	5.23 %	2.44 %	1.70 %

To obtain the Fund's current yield, please call (877) 521-4083.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Select Class
To establish an account	$750,000,000
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

You may purchase or redeem Fund Shares by written request or wire transfer. Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Telephone:

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

Select Class shares of the Fund generally are not offered for purchase through Financial Intermediaries.

State Street Institutional U.S. Government Money Market Fund

Investment Objective

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Management Fee	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%
Other Expenses1	0.06%
Total Annual Fund Operating Expenses	0.11%
Less Fee Waivers and/or Expense Reimbursements2	(0.03%)
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements2	0.08%

Other Expenses are based on estimates for the current fiscal year.

Example:

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated, and then sell or hold all of your Fund Shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. The calculation of costs for the one-year period takes into account the effect of any current contractual fee waivers and/or reimbursements, and the calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of each such period. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

1 year	3 years	5 years	10 years
$8	$32	$59	$138

Principal Investment Strategies

The Fund attempts to meet its investment objective by investing in:

•

Repurchase agreements collateralized by U.S. government securities.

Principal Risks

sional appropriations, and their securities are not issued by the U.S. Treasury, are not supported by the full faith and credit of the U.S. government, and involve increased credit risks.

Market Risk: The Fund's investments are subject to changes in general economic conditions, general market fluctuations and the risks inherent in investment in securities markets. Investment markets can be volatile and prices of investments can change substantially due to various factors, including, but not limited to, economic growth or recession, changes in interest rates, inflation, changes in the actual or perceived creditworthiness of issuers, and general market liquidity. The Fund is subject to the risk that geopolitical events will disrupt securities markets and adversely affect global economies and markets. Local, regional or global events such as war, military conflicts, acts of terrorism, trade policy changes or disputes, the threat or actual imposition of tariffs, natural disasters, the spread of infectious illness or other public health issues, or other events could have a significant impact on the Fund and its investments.

Performance

The bar chart and table below provide some indication of the risks of investing in the U.S. Government Fund by illustrating the variability of the Fund's returns for Select Class shares from year-to-year. The bar chart shows how the Select Class shares' returns have varied for each full calendar year shown. For periods prior to June 1, 2022, the inception date for Select Class shares, the performance information shown is that of the Premier Class shares of the Fund, which are not offered in this Prospectus, adjusted to reflect the higher class-related operating fees and expenses of Select Class shares. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (877) 521-4083 or by visiting our website at www.ssga.com.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	1.34%	Q4 2023
Lowest Quarterly Return	0.00%	Q1 2015

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Ten Years	Inception Date
Select Class	5.27 %	2.46 %	1.72 %	6/1/2022

To obtain the Fund's current yield, please call (877) 521-4083.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Select Class
To establish an account	$750,000,000
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

You may purchase or redeem Fund Shares by written request or wire transfer. Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Telephone:

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

Select Class shares of the Fund generally are not offered for purchase through Financial Intermediaries.

Additional Information About Investment Objectives, Principal Strategies and Risks

Investment Objective

The investment objective of each of the Treasury Fund, the Treasury Plus Fund and the U.S. Government Fund, as stated in each Fund's Summary, may be changed without shareholder approval.

Treasury Fund

Principal Investment Strategies

The Treasury Fund is a government money market fund and attempts to meet its investment objective by investing only in U.S. Treasury bills, notes and bonds (which are direct obligations of the U.S. government). The Fund will provide shareholders with at least sixty (60) days' prior notice of any change in this investment policy. The Fund may hold a portion of its assets in cash pending investment, to satisfy redemption requests or to meet the Fund's other cash management needs.

Treasury Plus Fund

Principal Investment Strategies

The Treasury Plus Fund is a government money market fund and attempts to meet its investment objective by investing only in U.S. Treasury bills, notes and bonds (which are direct obligations of the U.S. government) and repurchase agreements collateralized by these obligations. The Fund will provide shareholders with at least sixty (60) days' prior notice of any change in this investment policy. The Fund may hold a portion of its assets in cash pending investment, to satisfy redemption requests or to meet the Fund's other cash management needs.

U.S. Government Fund

Principal Investment Strategies

The U.S. Government Fund is a government money market fund and invests only in obligations issued or guaranteed as to principal and/or interest, as applicable, by the U.S. government or its agencies and instrumentalities, as well as repurchase agreements secured by such instruments. The Fund will provide shareholders with at least sixty (60) days' prior notice of any change in this investment policy. The Fund may hold a portion of its assets in cash pending investment, to satisfy redemption requests or to meet the Fund's other cash management needs.

The Fund follows a disciplined investment process that attempts to provide stability of principal, liquidity and current income, by investing in U.S. government securities. Among other things, SSGA FM conducts its own credit analyses of potential investments and portfolio holdings, and relies substantially on a dedicated short-term credit research team. The Fund invests in accordance with regulatory requirements applicable to money market funds. Regulations require, among other things, a money market fund to invest only in short-term, high quality debt obligations (generally, securities that have remaining maturities of 397 calendar days or less, with the exception of certain floating rate securities that may have final maturities longer than 397 days but use maturity shortening provisions to meet the 397 day requirement, and that the Fund believes present minimal credit risk), to maintain a maximum dollar-weighted average maturity and dollar-weighted average life of sixty (60) days or less and 120 days or less, respectively, and to meet requirements as to portfolio diversification and liquidity. All securities held by the Fund are U.S. dollar-denominated, and they may have fixed, variable or floating interest rates.

The Fund attempts to meet its investment objective by investing in:

•

Repurchase agreements collateralized by U.S. government securities.

Additional Information About Risks

Counterparty Risk (principal risk for the U.S. Government Fund and Treasury Plus Fund). A Fund will be subject to credit risk with respect to the counterparties with which a Fund enters into repurchase agreements and other transactions. If a counterparty fails to meet its contractual obligations, a Fund may be unable to terminate the transaction, and it may be delayed or prevented from realizing on any collateral in the event of a bankruptcy or insolvency proceeding relating to the counterparty.

Credit Risk (principal risk for the U.S. Government Fund and Treasury Plus Fund). Credit risk is the risk that an issuer, guarantor or liquidity provider of a fixed-income security held by a Fund may be unable or unwilling, or may be perceived (whether by market participants, ratings agencies, pricing services or otherwise) as unable or unwilling, to make timely principal and/or interest payments, or to otherwise honor its obligations. It includes the risk that the security will be downgraded by a credit rating agency; generally, lower credit quality issuers present higher credit risks. An actual or perceived

decline in creditworthiness of an issuer of a fixed-income security held by a Fund may result in a decrease in the value of the security. It is possible that the ability of an issuer to meet its obligations will decline substantially during the period when a Fund owns securities of the issuer or that the issuer will default on its obligations or that the obligations of the issuer will be limited or restructured.

tions about those investments. Variable and floating rate securities also generally increase or decrease in value in response to changes in interest rates, although generally to a lesser degree than fixed-rate securities. A substantial increase in interest rates may also have an adverse impact on the liquidity of a security, especially those with longer durations. Changes in governmental policy, including changes in central bank monetary policy, could cause interest rates to rise rapidly, or cause investors to expect a rapid rise in interest rates. This could lead to heightened levels of interest rate, volatility and liquidity risks for the fixed income markets generally and could have a substantial and immediate effect on the values of a Fund's investments. High levels of inflation and/or a significantly changing interest rate environment can lead to heightened levels of volatility and reduced liquidity.

Market Disruption and Geopolitical Risk. A Fund is subject to the risk that geopolitical events will disrupt securities markets and adversely affect global economies and markets. War, terrorism, and related geopolitical events have led, and in the future may lead, to increased short-term market volatility and may have adverse long-term effects on U.S. and world economies and markets generally. Likewise, trade policy changes or disputes, natural and environmental disasters, pandemics and epidemics, and systemic market dislocations may be highly disruptive to economies and markets. Those events, as well as other changes in foreign and domestic economic and political conditions, also could adversely affect individual issuers or related groups of issuers, securities markets, interest rates, credit ratings, inflation, investor sentiment, and other factors affecting the value of a Fund's investments. Given the increasing interdependence among global economies and markets, conditions in one country, market, or region might adversely affect markets, issuers, and/or foreign exchange rates in other countries, including the U.S. Any partial or complete dissolution of the Economic and Monetary Union of the European Union, or any increased uncertainty as to its status, could have significant adverse effects on currency and financial markets, and on the values of a Fund's investments. On January 31, 2020, the United Kingdom (“UK”) formally withdrew from the European Union (“EU”) (commonly known as “Brexit”). An agreement between the UK and the EU governing their future trade relationship became effective January 1, 2021, but that agreement does not include an agreement on financial services, and it is unlikely that such agreement will be concluded. Moreover, the UK government has started a program of financial services law reform with the ultimate aim of repealing many EU financial services laws that were assimilated into UK law from January 1, 2021, and replacing them with legislation or rules made by the UK government or financial services regulators. Accordingly, uncertainty remains in certain areas as to the future relationship between the UK and the EU. Brexit has already had a significant impact on the UK, Europe, and global economies, and could continue to result in volatility and illiquidity, legal, political, economic and regulatory uncertainties

Money Market Fund Risk. An investment in a money market fund is not a deposit of any bank and is not insured or guaranteed by the FDIC or any other government agency. Although a money market fund generally seeks to preserve the value of its shares at $1.00 per share, there can be no assurance that it will do so, and it is possible to lose money by investing in a money market fund. A major or unexpected change in interest rates or a decline in the credit quality of an issuer or entity providing credit support, an inactive trading market for money market instruments, or adverse market, economic, industry, political, regulatory, geopolitical, and other conditions could cause a money market fund's share price to fall below $1.00. It is possible that a money market fund will issue and redeem shares at $1.00 per share at times when the fair value of the money market fund's portfolio per share is more or less than $1.00. Rule 2a-7 as adopted by the SEC permits a money market fund to impose a liquidity fee upon the sale of fund shares under certain circumstances, however the Treasury Fund, Treasury Plus Fund and U.S. Government Fund are all government money market funds that have not elected to be subject to the liquidity fee provision of Rule 2a-7. None of State Street Corporation, State Street, State Street Global Advisors, SSGA FM or their affiliates (collectively, the “State Street Entities”) guarantee the value of an investment in a money market fund at $1.00 per share. Investors should have no expectation of capital support to a money market fund from the State Street Entities.

Repurchase Agreement Risk (principal risk for the U.S. Government Fund and Treasury Plus Fund). A repurchase agreement is an agreement to buy a security from a seller at one price and a simultaneous agreement to sell it back to the original seller at an agreed-upon price, typically representing the purchase price plus interest. Repurchase agreements may be viewed as loans made by a Fund, which are collateralized by the securities subject to repurchase. A Fund's investment return on such transactions will depend on the counterparty's willingness and ability to perform its obligations under a repurchase agreement. If a Fund's counterparty should default on its obligations and a Fund is delayed or prevented from recovering the collateral, or if the value of the collateral is insufficient, a Fund may realize a loss.

Significant Exposure to U.S. Government Agencies or Instrumentalities Risk (principal risk for the U.S. Government Fund). To the extent a Fund focuses its investments in securities issued or guaranteed by U.S. government agencies or instrumentalities, any market movements, regulatory changes or changes in political or economic conditions that affect the U.S. government agencies or instrumentalities in which the Fund invests may have a significant impact on a Fund's performance. Events that would adversely affect the market prices of securities issued or guaranteed by one government agency or instrumentality may adversely affect the market price of securities issued or guaranteed by other government agencies or instrumentalities.

U.S. Treasury Obligations Risk (principal risk for the Treasury Fund, Treasury Plus Fund and U.S. Government Fund). U.S. Treasury obligations may differ from other securities in their interest rates, maturities, times of issuance and other characteristics. Similar to other issuers, changes to the financial condition or credit rating of the U.S. government may cause the value of a Fund's U.S. Treasury obligations to decline. The total public debt of the United States as a percentage of gross domestic product grew rapidly after the financial crisis of 2008 and has remained at a historically high level.

Although high debt levels do not necessarily indicate or cause economic problems, they may create certain systemic risks if sound debt management practices are not implemented. A high national debt level may increase market pressures to meet government funding needs, which may drive debt cost higher and cause a country to sell additional debt, thereby increasing refinancing risk. A high national debt also raises concerns that a government will not be able to make principal or interest payments when they are due. In the worst case, unsustainable debt levels can cause a decline in the value of the dollar (which may lead to inflation), and can prevent the U.S. government from implementing effective countercyclical fiscal policy in economic downturns. On August 5, 2011, Standard & Poor's Ratings Services downgraded U.S. Treasury securities from AAA rating to AA+ rating. Standard & Poor's Ratings Services stated that its decision was prompted by its view on the rising public debt burden and its perception of greater policymaking uncertainty. Fitch also downgraded its rating of U.S. Treasury securities from AAA to AA+ in August 2023 citing increasing government debt and erosion in confidence regarding governance of fiscal matters as a result of repeated political standoffs related to debt limit approvals. A downgrade of the ratings of U.S. government debt obligations, which are often used as a benchmark for other borrowing arrangements, could result in higher interest rates for individual and corporate borrowers, cause disruptions in the international bond markets and have a substantial negative effect on the U.S. economy. Any additional downgrades of U.S. Treasury securities from ratings agencies may cause the value of a Fund's U.S. Treasury obligations to decline. In recent years, impasses in Congress regarding the federal budget have caused temporary Federal government shutdowns. While Congress has temporarily suspended the debt limit from time to time, the risks that the U.S. government will not adopt a long-term budget or deficit reduction plan, of one or more additional Federal government shutdowns or of future failures to not increase the Federal government's debt limit, may affect investor and consumer confidence and may adversely impact financial markets and the broader economy, perhaps suddenly and to a significant degree.

Variable and Floating Rate Securities Risk. Variable or floating rate securities are debt securities with variable or floating interest rates payments. Variable or floating rate securities bear rates of interest that are adjusted periodically according to formulae intended generally to reflect market rates of interest and allow a Fund to participate (determined in accordance with the terms of the securities) in increases in interest rates through upward adjustments of the coupon rates on the securities. However, during periods of increasing interest rates, changes in the coupon rates may lag behind the changes in market rates or may have limits on the maximum increases in coupon rates. Alternatively, during periods of declining interest rates, the coupon rates on such securities will typically readjust downward resulting in a lower yield. A Fund may also invest in variable or floating rate equity securities, whose dividend payments vary based on changes in market rates of interest or other factors.

Additional Information About Non-Principal Investment Strategies and Risks

restrict the Adviser from purchasing securities or selling securities for itself or its clients (including the Funds) or otherwise using such information for the benefit of its clients or itself.

Cybersecurity Risk. With the increased use of technologies such as the Internet and the dependence on computer systems to perform business and operational functions, funds (such as the Funds) and their service providers (including the Adviser) may be prone to operational and information security risks resulting from cyber-attacks and/or technological malfunctions. Furthermore, geopolitical tensions may have increased the scale and sophistication of deliberate cybersecurity attacks, particularly those from nation-states or from entities with nation-state backing. In general, cyber-attacks are deliberate, but unintentional events may have similar effects. Cyber-attacks include, among others, stealing or corrupting data maintained online or digitally, preventing legitimate users from accessing information or services on a website, releasing confidential information without authorization, and causing operational disruption. Successful cyber-attacks against, or security breakdowns of, a Fund, a Portfolio, the Adviser or a custodian, transfer agent, or other affiliated or third-party service provider may adversely affect a Fund or its shareholders. For instance, cyber-attacks or technical malfunctions may interfere with the processing of shareholder or other transactions, affect a Fund's ability to calculate its NAV, cause the release of private shareholder information or confidential Fund information, impede trading, cause reputational damage, and subject a Fund to regulatory fines, penalties or financial losses, reimbursement or other compensation costs, and additional compliance costs. Cyber-attacks or technical malfunctions may render records of Fund assets and transactions, shareholder ownership of Fund Shares, and other data integral to the functioning of a Fund inaccessible or inaccurate or incomplete. A Fund may also incur substantial costs for cybersecurity risk management in order to prevent cyber incidents in the future. A Fund and its shareholders could be negatively impacted as a result. While the Adviser has established business continuity plans and systems designed to minimize the risk of cyber-attacks through the use of technology, processes and controls, there are inherent limitations in such plans and systems, including the possibility that certain risks have not been identified, given the evolving nature of this threat. The use of artificial intelligence (“AI”) and machine learning could exacerbate these risks or result in cyber security incidents that implicate personal data. Each Fund relies on third-party service providers for many of its day-to-day operations, and will be subject to the risk that the protections and protocols implemented by those service providers will be ineffective to protect the Fund from cyber-attack. The Adviser does not control the cybersecurity plans and systems put in place by third-party service providers, and such third-party service providers may have limited indemnification obligations to the Adviser or the Funds. Similar types of cybersecurity risks or technical malfunctions also are present for issuers of securities in which each Fund invests, which could result in material adverse consequences for such issuers, and may cause a Fund's investment in such securities to lose value.

Portfolio Holdings Disclosure

The Funds' portfolio holdings disclosure policy is described in the Statement of Additional Information (“SAI”).

Management and Organization

Investment Adviser

SSGA FM serves as the investment adviser to each Fund and corresponding Portfolio pursuant to an investment advisory agreement (“Investment Advisory Agreement”) between the Trust and the Adviser, and, subject to the oversight of the Board, is responsible for the investment management of each Fund. The Adviser provides an investment management program for each Fund and manages the investment of each Fund's assets. In addition, the Adviser provides administrative, compliance and general management services to each Fund. The Adviser is a wholly-owned subsidiary of State Street Global Advisors, Inc., which itself is a wholly-owned subsidiary of State Street Corporation. The Adviser is registered with the SEC under the Investment Advisers Act of 1940, as amended. The Adviser and certain other affiliates of State Street Corporation make up SSGA. SSGA is one of the world's largest institutional money managers and the investment management arm of State Street Corporation. As of December 31, 2024, the Adviser managed approximately $1.11 trillion in assets and SSGA managed approximately $4.72 trillion in assets. The Adviser's principal business address is One Iron Street, Boston, Massachusetts 02210.

Each Fund has entered into an investment advisory agreement with the Adviser pursuant to which the Adviser will manage the Fund's assets directly, for compensation paid at an annual rate of 0.05% of the Fund's average daily net assets, in the event that the Fund were to cease investing substantially all of its assets in its corresponding Portfolio or another investment company with essentially the same investment objectives and policies as the Fund. The Adviser does not receive any management fees from a Fund under that agreement so long as the Fund continues to invest substantially all of its assets in the corresponding Portfolio or in another investment company with essentially the same investment objectives and policies as the Fund. The Adviser places all orders for purchases and sales of the Portfolios' investments. For the year ended December 31, 2024, the effective management fee paid, reflecting certain fee waivers and expense reimbursements of the Adviser, was 0.05% for Treasury Portfolio, 0.05% for Treasury Plus Portfolio and 0.05% for U.S. Government Portfolio.

Total Annual Fund Operating Expense Waivers. SSGA FM, as the investment adviser to each Fund is contractually obligated until April 30, 2026 to reimburse each Fund for expenses to the extent that Total Annual Fund Operating Expenses (exclusive of interest, brokerage commissions, taxes, extraordinary expenses, deferred organizational expenses or acquired fund fees and expenses) of the Select Class shares of each Fund exceed 0.08% of average daily net assets on an annual basis. This reimbursement arrangement for Select Class shares of the Fund may not be terminated prior to April 30, 2026 except with approval of the Board.

In addition to any contractual expense limitation for a Fund, which is described in the Fund Summaries, each of the Adviser and State Street Global Advisors Funds Distributors, LLC (each a “Service Provider”) also may voluntarily reduce all or a portion of its fees and/or reimburse expenses for a Fund or a share class to the extent necessary to maintain a certain minimum net yield, which may vary from time to time and from share class to share class within a Fund, in SSGA FM's sole discretion (any such waiver or reimbursement of expenses being referred to herein as a “Voluntary Reduc

tion”). Under an agreement with the Service Providers relating to the Voluntary Reduction, the Funds and the Portfolios have agreed to reimburse the Service Providers for the full dollar amount of any Voluntary Reduction beginning on May 1, 2020, subject to certain limitations. Each Service Provider may, in its sole discretion, irrevocably waive receipt of any or all reimbursement amounts due from a Fund.

A discussion regarding the Board's consideration of the Funds' Investment Advisory Agreement is provided in the Funds' Form N-CSR filing with the SEC for the period ended June 30, 2024.

The Administrator, Sub-Administrator and Custodian

The Adviser serves as administrator of each Fund. The amount of the fee paid to the Adviser for administrative services may vary by share class. Each Fund currently pays the Adviser an administrative fee at the annual rate of 0.05% in respect of the class of shares in this Prospectus. State Street Bank and Trust Company (“State Street”), a subsidiary of State Street Corporation, serves as the sub-administrator for the Funds for a fee that is paid by the Adviser. State Street also serves as custodian of the Funds for a separate fee that is paid by the Funds. SSGA FM serves as administrator of the Portfolios and State Street serves as sub-administrator and custodian of the Portfolios.

The Transfer Agent and Dividend Disbursing Agent

SS&C GIDS, Inc. is the Funds' transfer agent and dividend disbursing agent (the “Transfer Agent”).

The Distributor

State Street Global Advisors Funds Distributors, LLC serves as the Funds' distributor (“SSGA FD”) pursuant to the Distribution Agreement between SSGA FD and the Trust.

Additional Information

Shareholder Information

Determination of Net Asset Value

The Treasury Plus Fund and the U.S. Government Fund each determines its NAV per share once each Business Day (as defined below), typically at 5:00 p.m. ET and the Treasury Fund determines its NAV per share once each Business Day, typically at 2:30 p.m. ET (the time when a Fund determines its NAV per share is referred to herein as the “Valuation Time”). The Funds reserve the right to advance the time for accepting purchase or redemption orders and/or the Valuation Time on any day when the NYSE, bond markets (as recommended by The Securities Industry and Financial Markets Association (“SIFMA”)) or any Federal Reserve bank close early, trading on the NYSE is restricted, an emergency arises or as otherwise permitted by the SEC. The Funds reserve the right to continue to accept orders to purchase or redeem shares following the close of the NYSE on any day on which the NYSE closes early, provided that either the Federal Reserve or the bond markets remain open. In addition, the Board may, for any Business Day, decide to change the time as of which a Fund's NAV is calculated in response to new developments such as altered trading hours, or as otherwise permitted by the SEC.

Investing in State Street Institutional Investment Trust Shares

Purchasing Shares

Eligible investors of the Select Class Shares of the Funds generally are limited to institutional entities that hold Fund Shares directly with a Fund, as opposed to through a broker, bank or other financial intermediary.

Investors pay no sales load to invest in the Select Class Shares of the Funds. Purchase requests received by a Fund in good order (a purchase request is in good order if it meets the requirements implemented from time to time by the Transfer Agent or authorized agent of the Fund, and for new accounts includes submission of a completed and signed appli

cation and all documentation necessary to open an account) on a Business Day will, if payment is received by FedWire, be priced at the NAV next determined after the order is accepted by the Fund. Payments received by FedWire prior to the last Valuation Times will earn dividend accrual for that purchase.

The minimum initial investment in Select Class of the Funds is $750 million, although the Adviser may waive the minimum in its discretion. Holdings of related customer accounts may be aggregated for purposes of determining the minimum investment amount. “Related customer accounts” may include, but are not limited to, accounts held by the same investment or retirement plan, financial institution, broker, dealer or intermediary. The Funds and the Adviser reserve the right to increase or decrease the minimum amount required to open or maintain an account. There is no minimum subsequent investment, except in relation to maintaining certain minimum account balances (See “Redeeming Shares” below). The Funds require prior notification of subsequent investments in excess of $10 million for the Treasury Fund and $50 million for the U.S. Government Fund and Treasury Plus Fund.

The Funds reserve the right to cease accepting investments at any time or to reject any investment order. In addition, the U.S. Government Fund and the Treasury Plus Fund may limit the amount of a purchase order received after 3:00 p.m. ET. The Treasury Fund may limit the amount of a purchase order received after 12:00 p.m. (noon) ET.

How to Purchase Shares

By Mail:

An initial investment in the Funds must be preceded or accompanied by a completed, signed Institutional Account

Application Form, sent to:

State Street Funds

P.O. Box 219737

Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds

801 Pennsylvania Avenue, Suite 219737

Kansas City, MO 64105-1307

By Telephone/Fax:

An initial investment in the Funds must be preceded or accompanied by a completed, signed Institutional Account

Application Form, faxed to (816) 218-0400. Call the Fund at (866) 392-0869 between the hours of 8:00 a.m. ET

and 6:00 p.m. ET to:

➢ confirm receipt of the faxed Institutional Account Application Form (initial purchases only),

➢ request your new account number (initial purchases only),

➢ confirm the amount being wired and wiring bank, and

➢ receive a confirmation number for your purchase order (your trade is not effective until you have received a

confirmation number from the Fund).

For your initial investment, send the original, signed Institutional Account Application Form to the address above.

Wire Instructions:

Instruct your bank to transfer money by Federal Funds wire to:

State Street Bank and Trust Company

1 Iron Street

Boston, MA 02210

ABA# 011000028

DDA# 9904-631-0

State Street Institutional Investment Trust

Fund Name

Class Name

Account Number

Account Registration

On Columbus Day and Veterans Day, you will not be able to purchase shares by wiring Federal Funds because the

Federal Funds wiring does not occur on those days. Payment for Fund Shares must be in Federal Funds (or

converted to Federal Funds by the Transfer Agent) by the close of the Federal Reserve.

The Funds and the Funds' agents are not responsible for transfer errors by the sending or receiving bank and will

not be liable for any loss incurred due to a wire transfer not having been received.

Redeeming Shares

An investor may redeem all or any portion of its investment. Redemption orders are processed at the NAV next determined after a Fund receives a redemption order in good form.

For the U.S. Government Fund, Treasury Fund and the Treasury Plus Fund

If the Treasury Fund, the Treasury Plus Fund or the U.S. Government Fund receives a redemption order in good form prior to 2:30 p.m. ET for the Treasury Fund and 5:00 p.m. ET for the Treasury Plus Fund and U.S. Government Fund on a Business Day, the Fund typically expects to pay out redemption proceeds on that day, but no later than the next Business Day if redemption proceeds are sent by wire or ACH.

If redemption proceeds are sent by check, the Fund pays out redemption proceeds on the next Business Day. If a full redemption order is requested, no dividends will accrue with respect to shares on the day the redemption proceeds are sent. If a redemption order is placed after 2:30 p.m. ET for the Treasury Fund and 5:00 p.m. ET for the U.S. Government Fund and the Treasury Plus Fund, the Fund typically expects to pay out redemption proceeds on the next Business Day (and dividends will accrue up to, but not including, the day that redemption proceeds are sent), but no later than the following Business Day. The Fund may postpone and/or suspend redemption and payment beyond the foregoing time periods only as follows:

For any period during which there is a non-routine closure of the Fedwire or applicable Federal Reserve Banks;

For any period (1) during which the NYSE is closed other than customary week-end and holiday closings or (2) during which trading on the NYSE is restricted;

For any period during which the SEC has, by rule or regulation, deemed that (1) trading shall be restricted or (2) an emergency exists;

For any period that the SEC, may by order permit for your protection; or

Rule 2a-7 as adopted by the SEC permits a money market fund to impose a liquidity fee upon the sale of fund shares under certain circumstances, however the Treasury Fund, Treasury Plus Fund and U.S. Government Fund are all government money market funds that have not elected to be subject to the liquidity fee provision of Rule 2a-7. Although each Fund attempts to maintain its NAV at $1.00 per share, there can be no assurance that it will be successful, and there can be no assurance that a shareholder will receive $1.00 per share upon any redemption.

For all Funds

A Fund may pay all or a portion of your redemption proceeds by giving you securities (for example, if the Fund reasonably believes that a cash redemption may have a substantial impact on the Fund and its remaining shareholders). A redemption is generally a taxable event for shareholders, regardless of whether the redemption is satisfied in cash or in kind. You may pay transaction costs and/or taxes to dispose of the securities, and you may receive less for them than the price at which they were valued for purposes of the redemption. In addition, you will be subject to the market risks associated with such securities until such time as you choose to dispose of the security.

financial intermediaries as determined by their policies and may be waived in the Adviser's discretion. The Funds reserve the right to modify minimum account requirements at any time with or without prior notice. The Funds also reserve the right to involuntarily redeem an investor's account if the investor's account balance falls below the applicable minimum amount due to transaction activity.

How to Redeem Shares


By Mail:	Send a signed letter to: State Street Institutional Investment Trust Funds P.O. Box 219737 Kansas City, MO 64121-9737
	The letter should include information necessary to process your request as described below. The Fund may require a medallion guarantee in certain circumstances. See “Medallion Guarantees” below.
By Overnight:	State Street Institutional Investment Trust Funds 801 Pennsylvania Avenue, Suite 219737 Kansas City, MO 64105-1307
By Telephone:	Please call (866) 392-0869 between the hours of 8:00 a.m. and 6:00 p.m. ET.
The Funds will need the following information to process your redemption request:
➢ name(s) of account owners; ➢ account number(s); ➢ the name of the Fund; ➢ your daytime telephone number; and ➢ the dollar amount or number of shares being redeemed.

On any day that the Funds calculate their NAVs earlier than normal, the Funds reserve the right to adjust the times noted above for purchasing and redeeming shares.

Medallion Guarantees. Certain redemption requests must include a medallion guarantee for each registered account owner if any of the following apply:

•

Your account address has changed within the last 10 Business Days.

•

Redemption proceeds are being transferred to an account with a different registration.

•

A wire is being sent to a financial institution other than the one that has been established on your Fund account.

•

Other unusual situations as determined by the Transfer Agent.

The Funds may terminate the receipt of redemption orders by telephone at any time, in which case you may redeem shares by other means.

If you choose to purchase or redeem shares by sending instructions by regular mail, they will not be deemed received in good order until they are released by the post office and redelivered to the Transfer Agent's physical location at 801 Pennsylvania Avenue, Suite 219737 in Kansas City, MO 64105-1307. There will be a time lag, which may be one or more days, between regular mail receipt at the post office box and redelivery to such physical location in Kansas City, and a Fund's NAV may change over those days. You might consider using express rather than regular mail if you believe the time of receipt of your transaction request to be sensitive.

Exchanging Shares

An exchange occurs when you use the proceeds from the redemption of shares of a Fund in the State Street Institutional Investment Trust to simultaneously purchase shares of a different Fund in the State Street Institutional Investment Trust. Currently, exchanging shares is allowed from/to each Fund. Exchanges may be made between different Funds within the same class (i.e., Select Class shares for Select Class shares). The account holding the original shares must be registered in the same name as the account holding the new shares received in the exchange. You may make exchange requests by telephone, or by mail. See Purchasing Shares and Redeeming Shares. Exchanges are subject to the terms applicable to the purchases of the fund into which you are exchanging. Exchange privileges may not be available for mutual funds advised by SSGA FM (the “State Street Funds”) and may be suspended or rejected.

Excessive Trading

Delivery of Documents to Accounts Sharing an Address

To reduce expenses, we may mail only one copy of the Funds' Prospectus and each annual and semi-annual report to those addresses shared by two or more accounts. If you wish to receive individual copies of these documents, please call us at (866) 392-0869, or contact your financial institution. We will begin sending you individual copies thirty (30) days after receiving your request.

Unclaimed Property

Many states have unclaimed property rules that provide for transfer to the state (also known as “escheatment”) of unclaimed property under various circumstances. These circumstances include inactivity (e.g., no owner-initiated contact for a certain period), returned mail (e.g., when mail sent to a shareholder is returned by the post office as undeliverable), or a combination of both inactivity and returned mail. If a State Street Fund identifies property as unclaimed, it will attempt to contact the shareholder, but if that attempt is unsuccessful, the account may be considered abandoned and escheated to the state after the passage of a certain period of time (as required by applicable state law).

Dividends, Distributions and Tax Considerations

If the NAV of Fund Shares were to vary from $1.0000 per share, shareholders generally would realize a gain or loss upon the redemption or other taxable disposition of such Fund Shares. Any such gain generally would be taxable to you as either short-term or long-term capital gain, depending upon how long you held the Fund Shares. The Internal Revenue Service (the “IRS”) has issued final regulations and published guidance that permit a simplified method of accounting for gains and losses realized upon the disposition of money market fund shares. Shareholders should see the SAI for further information.

An additional 3.8% Medicare contribution tax is imposed on the “net investment income” of individuals, estates and trusts to the extent their income exceeds certain threshold amounts. Net investment income generally includes for this purpose dividends paid by a Fund and net gains recognized on the redemption (or other taxable disposition) of Fund Shares.

Financial Highlights

The Select Class shares of the State Street Institutional Treasury Money Market Fund and the State Street Institutional Treasury Plus Money Market Fund had not commenced operations prior to the date of this Prospectus and therefore do not have financial information.

The financial highlight tables are intended to help you understand the U.S. Government Fund's financial performance for the past five fiscal years. Certain information reflects the performance results for a single Fund Share. The total returns in the table represent the rate that an investor would have earned (or lost) on an investment in the U.S. Government Fund (assuming reinvestment of all dividends and distributions). This information has been audited by Ernst & Young LLP, the Trust's independent registered public accounting firm, whose report, along with the U.S. Government Fund's financial highlights and financial statements, is included in the U.S. Government Fund's Form N-CSR filing, which is available upon request. Any references to Notes in these financial highlight tables refer to the “Notes to Financial Statements” section of the U.S. Government Fund's financial statements, and the financial information included in these tables should be read in conjunction with the financial statements incorporated by reference in the SAI.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL U.S. GOVERNMENT MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Select Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	For the Period 6/2/22*- 12/31/22
Net asset value, beginning of period	$1.0000	$1.0000	$1.0000
Income (loss) from investment operations:
Net investment income (loss)	0.0514	0.0498	0.0152
Net realized gain (loss)	(0.0000 )(b)	0.0000 (b)	—
Total from investment operations	0.0514	0.0498	0.0152
Distributions to shareholders from:
Net investment income	(0.0514 )	(0.0498 )	(0.0152 )
Net asset value, end of period	$1.0000	$1.0000	$1.0000
Total return (c)	5.27 %	5.10 %	1.62 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$66,377	$43,234	$28,693
Ratios to Average Net Assets:
Total expenses	0.11 %	0.11 %	0.12 %(d)
Net expenses	0.08 %	0.07 %	0.08 %(d)
Net investment income (loss)	5.12 %	5.02 %	2.86 %(d)

*	Commencement of operations.
(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(d)	Annualized.

For more information about the Funds:

The Funds' SAI includes additional information about the Funds and is incorporated by reference into this document. Additional information about the Funds' investments is available in the U.S. Government Fund's and will be available in the Treasury Plus Fund's and Treasury Fund's most recent annual and semi-annual reports to shareholders and is available in the U.S. Government Fund's and will be available in the Treasury Plus Fund's and Treasury Fund's Form N-CSR filing. In a Fund's Form N-CSR, you will find the Fund's annual and semi-annual financial statements. The Funds' SAI is available, without charge, upon request. The Funds' annual and semi-annual reports are available for the U.S. Government Fund and will be available for the Treasury Plus Fund and Treasury Fund without charge, upon request. Shareholders in the Funds may make inquiries to the Funds to receive such information by calling (877) 521-4083 or the customer service center at the telephone number shown in the accompanying contract prospectus, if applicable. Each Fund's Prospectus, SAI, annual and semi-annual reports to shareholders and other information such as the Fund's financial statements are available, free of charge, on the Funds' website at www.ssga.com.

SSGA Funds Management, Inc

ONE IRON STREET

BOSTON, MASSACHUSETTS 02210

MULTISLCTSTATPROThe State Street Institutional Investment Trust's Investment Company Act File Number is 811-09819.

Prospectus

April 30, 2025

State Street Institutional
Investment Trust

State Street Institutional Liquid Reserves Government Money Market Fund

(formerly State Street Institutional Liquid Reserves Fund)

Bancroft Capital Class (VTDXX)

State Street Institutional Treasury Money Market Fund

Bancroft Capital Class (VTTXX)

State Street Institutional Treasury Plus Money Market Fund

Bancroft Capital Class (VTLXX)

State Street Institutional U.S. Government Money Market Fund

Bancroft Capital Class (VTGXX)

The U.S. Securities and Exchange Commission has not approved or disapproved these securities or passed upon the adequacy of this Prospectus. Any representation to the contrary is a criminal offense.

An investment in any of the Funds offered by this Prospectus is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Each Fund may offer multiple classes of shares. This Prospectus covers only the Bancroft Capital Class Shares of the applicable Funds.

TABLE OF CONTENTS

Fund Summaries	4
State Street Institutional Liquid Reserves Government Money Market Fund	4
State Street Institutional Treasury Money Market Fund	10
State Street Institutional Treasury Plus Money Market Fund	15
State Street Institutional U.S. Government Money Market Fund	20
Additional Information About Investment Objectives, Principal Strategies and Risks	26
Additional Information About Non-Principal Investment Strategies and Risks	34
Portfolio Holdings Disclosure	35
Management and Organization	36
Shareholder Information	38
Dividends, Distributions and Tax Considerations	44
Financial Intermediary Arrangements	45
Financial Highlights	47

State Street Institutional Liquid Reserves Government Money Market Fund

Investment Objective

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Management Fee	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%
Other Expenses	0.10%
Total Annual Fund Operating Expenses1	0.15%

“Other Expenses and ”Total Annual Fund Operating Expenses“ have been restated to reflect current fees.

Example:

1 year	3 years	5 years	10 years
$15	$48	$85	$192

Principal Investment Strategies

The Fund attempts to meet its investment objective by investing in:

•

Repurchase agreements collateralized by U.S. government securities.

Principal Risks

Market Risk: The Fund's investments are subject to changes in general economic conditions, general market fluctuations and the risks inherent in investment in securities markets. Investment markets can be volatile and prices of investments can change substantially due to various factors, including, but not limited to, economic growth or recession, changes in interest rates, inflation, changes in the actual or perceived creditworthiness of issuers, and general market liquidity. The Fund is subject to the risk that geopolitical events will disrupt securities markets and adversely affect global economies and markets. Local, regional or global events such as war, military conflicts, acts of terrorism, trade policy changes or disputes, the threat or actual imposition of tariffs, natural disasters, the spread of infectious illness or other public health issues, or other events could have a significant impact on the Fund and its investments.

Performance

The bar chart and table below provide some indication of the risks of investing in the ILR Government Fund by illustrating the variability of the Fund's returns for Bancroft Capital Class shares from year-to-year. The bar chart shows how the Bancroft Capital Class shares' returns have varied for each full calendar year shown. For periods prior to October 12, 2021, the inception date for Bancroft Capital Class shares, the performance information shown is that of the Premier Class shares of the Fund, which are not offered in this Prospectus, adjusted to reflect the higher class-related operating fees and expenses of Bancroft Capital Class shares. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (877) 521-4083 or by visiting our website at www.ssga.com. Effective March 10, 2025, the ILR Government Fund converted to a government money market fund and adopted its current investment strategy. Prior to March 10, 2025, the ILR Government Fund operated as an institutional prime money market fund and invested in certain types of securities that the ILR Government Fund is no longer permitted to hold. Consequently, performance information for periods prior to March 10, 2025 would have been different had the ILR Government Fund's current investment strategy been in effect.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	1.41%	Q4 2023
Lowest Quarterly Return	0.00%	Q1 2022

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Ten Years	Inception Date
Bancroft Capital Class	5.30 %	2.57 %	1.87 %	10/12/2021

To obtain the Fund's current yield, please call (877) 521-4083.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Bancroft Capital Class
To establish an account	$25,000,000
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

You may purchase or redeem Fund Shares by written request or wire transfer. Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Telephone:

By Intermediary:

Financial Intermediaries may contact SS&C GIDS, Inc. at (877) 332-6207 or via email at nsccresearch@dstsystems.com with questions.

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

State Street Institutional Treasury Money Market Fund

Investment Objective

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Management Fee	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%
Other Expenses	0.09%
Total Annual Fund Operating Expenses	0.14%

Example:

1 year	3 years	5 years	10 years
$14	$45	$79	$179

Principal Investment Strategies

Principal Risks

Market Risk: The Fund's investments are subject to changes in general economic conditions, general market fluctuations and the risks inherent in investment in securities markets. Investment markets can be volatile and prices of investments can change substantially due to various factors, including, but not limited to, economic growth or recession, changes in interest rates, inflation, changes in the actual or perceived creditworthiness of issuers, and general market liquidity. The Fund is subject to the risk that geopolitical events will disrupt securities markets and adversely affect global economies and markets. Local, regional or global events such as war, military conflicts, acts of terrorism, trade policy changes or disputes, the threat or actual imposition of tariffs, natural disasters, the spread of infectious illness or other public health issues, or other events could have a significant impact on the Fund and its investments.

and the value of those securities may fall sharply. A rising interest rate environment may cause the value of the Fund's fixed income securities to decrease, an adverse impact on the liquidity of the Fund's fixed income securities, and increased volatility of the fixed income markets. During periods when interest rates are at low levels, the Fund's yield can be low, and the Fund may have a negative yield (i.e., it may lose money on an operating basis). To the extent that interest rates fall, certain underlying obligations may be paid off substantially faster than originally anticipated. If the principal on a debt obligation is prepaid before expected, the prepayments of principal may have to be reinvested in obligations paying interest at lower rates. During periods of falling interest rates, the income received by the Fund may decline. Changes in interest rates will likely have a greater effect on the values of debt securities of longer durations. Returns on investments in debt securities could trail the returns on other investment options, including investments in equity securities. High levels of inflation and/or a significantly changing interest rate environment can lead to heightened levels of volatility and reduced liquidity.

Performance

The bar chart and table below provide some indication of the risks of investing in the Treasury Fund by illustrating the variability of the Fund's returns for Bancroft Capital Class shares from year-to-year. The bar chart shows how the Bancroft Capital Class shares' returns have varied for each full calendar year shown. For periods prior to October 12, 2021, the inception date for Bancroft Capital Class shares, the performance information shown is that of the Premier Class shares of the Fund, which are not offered in this Prospectus, adjusted to reflect the higher class-related operating fees and expenses of Bancroft Capital Class shares. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (877) 521-4083 or by visiting our website at www.ssga.com.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	1.34%	Q4 2023
Lowest Quarterly Return	0.01%	Q1 2022

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Ten Years	Inception Date
Bancroft Capital Class	5.18 %	2.39 %	1.67 %	10/12/2021

To obtain the Fund's current yield, please call (877) 521-4083.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Bancroft Capital Class
To establish an account	$25,000,000
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

You may purchase or redeem Fund Shares by written request or wire transfer. Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Telephone:

By Intermediary:

Financial Intermediaries may contact SS&C GIDS, Inc. at (877) 332-6207 or via email at nsccresearch@dstsystems.com with questions.

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

State Street Institutional Treasury Plus Money Market Fund

Investment Objective

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Management Fee	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%
Other Expenses	0.09%
Total Annual Fund Operating Expenses	0.14%

Example:

1 year	3 years	5 years	10 years
$14	$45	$79	$179

Principal Investment Strategies

Principal Risks

Market Risk: The Fund's investments are subject to changes in general economic conditions, general market fluctuations and the risks inherent in investment in securities markets. Investment markets can be volatile and prices of investments can change substantially due to various factors, including, but not limited to, economic growth or recession, changes in interest rates, inflation, changes in the actual or perceived creditworthiness of issuers, and general market liquidity. The Fund is subject to the risk that geopolitical events will disrupt securities markets and adversely affect global economies and markets. Local, regional or global events such as war, military conflicts, acts of terrorism, trade policy changes or disputes, the threat or actual imposition of tariffs, natural disasters, the spread of infectious illness or other public health issues, or other events could have a significant impact on the Fund and its investments.

Performance

The bar chart and table below provide some indication of the risks of investing in the Treasury Plus Fund by illustrating the variability of the Fund's returns for Bancroft Capital Class shares from year-to-year. The bar chart shows how the Bancroft Capital Class shares' returns have varied for each full calendar year shown. For periods prior to October 12, 2021, the inception date for Bancroft Capital Class shares, the performance information shown is that of the Premier Class shares of the Fund, which are not offered in this Prospectus, adjusted to reflect the higher class-related operating fees and expenses of Bancroft Capital Class shares. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (877) 521-4083 or by visiting our website at www.ssga.com.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	1.33%	Q4 2023
Lowest Quarterly Return	0.01%	Q1 2022

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Ten Years	Inception Date
Bancroft Capital Class	5.20 %	2.44 %	1.70 %	10/12/2021

To obtain the Fund's current yield, please call (877) 521-4083.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Bancroft Capital Class
To establish an account	$25,000,000
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

You may purchase or redeem Fund Shares by written request or wire transfer. Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Telephone:

By Intermediary:

Financial Intermediaries may contact SS&C GIDS, Inc. at (877) 332-6207 or via email at nsccresearch@dstsystems.com with questions.

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

State Street Institutional U.S. Government Money Market Fund

Investment Objective

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Management Fee	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%
Other Expenses	0.09%
Total Annual Fund Operating Expenses	0.14%

Example:

1 year	3 years	5 years	10 years
$14	$45	$79	$179

Principal Investment Strategies

The Fund attempts to meet its investment objective by investing in:

•

Repurchase agreements collateralized by U.S. government securities.

Principal Risks

Market Risk: The Fund's investments are subject to changes in general economic conditions, general market fluctuations and the risks inherent in investment in securities markets. Investment markets can be volatile and prices of investments can change substantially due to various factors, including, but not limited to, economic growth or recession, changes in interest rates, inflation, changes in the actual or perceived creditworthiness of issuers, and general market liquidity. The Fund is subject to the risk that geopolitical events will disrupt securities markets and adversely affect global economies and markets. Local, regional or global events such as war, military conflicts, acts of terrorism, trade policy changes or disputes, the threat or actual imposition of tariffs, natural disasters, the spread of infectious illness or other public health issues, or other events could have a significant impact on the Fund and its investments.

Performance

The bar chart and table below provide some indication of the risks of investing in the U.S. Government Fund by illustrating the variability of the Fund's returns for Bancroft Capital Class shares from year-to-year. The bar chart shows how the Bancroft Capital Class shares' returns have varied for each full calendar year shown. For periods prior to October 12, 2021, the inception date for Bancroft Capital Class shares, the performance information shown is that of the Premier Class shares of the Fund, which are not offered in this Prospectus, adjusted to reflect the higher class-related operating fees and expenses of Bancroft Capital Class shares. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (877) 521-4083 or by visiting our website at www.ssga.com.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	1.33%	Q4 2023
Lowest Quarterly Return	0.01%	Q1 2022

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Ten Years	Inception Date
Bancroft Capital Class	5.20 %	2.44 %	1.71 %	10/12/2021

To obtain the Fund's current yield, please call (877) 521-4083.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Bancroft Capital Class
To establish an account	$25,000,000
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

You may purchase or redeem Fund Shares by written request or wire transfer. Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Telephone:

By Intermediary:

Financial Intermediaries may contact SS&C GIDS, Inc. at (877) 332-6207 or via email at nsccresearch@dstsystems.com with questions.

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

Additional Information About Investment Objectives, Principal Strategies and Risks

Investment Objective

The investment objective of each of the ILR Government Fund, Treasury Fund, Treasury Plus Fund and U.S. Government Fund, as stated in each Fund's Summary, may be changed without shareholder approval.

ILR Government Fund

Principal Investment Strategies

The Fund attempts to meet its investment objective by investing in:

•

Repurchase agreements collateralized by U.S. government securities.

Treasury Fund

Principal Investment Strategies

The Treasury Fund is a government money market fund and attempts to meet its investment objective by investing only in U.S. Treasury bills, notes and bonds (which are direct obligations of the U.S. government). The Fund will provide shareholders with at least sixty (60) days' prior notice of any change in this investment policy. The Fund may hold a portion of its assets in cash pending investment, to satisfy redemption requests or to meet the Fund's other cash management needs.

Treasury Plus Fund

Principal Investment Strategies

The Treasury Plus Fund is a government money market fund and attempts to meet its investment objective by investing only in U.S. Treasury bills, notes and bonds (which are direct obligations of the U.S. government) and repurchase agreements collateralized by these obligations. The Fund will provide shareholders with at least sixty (60) days' prior notice of any change in this investment policy. The Fund may hold a portion of its assets in cash pending investment, to satisfy redemption requests or to meet the Fund's other cash management needs.

U.S. Government Fund

Principal Investment Strategies

The U.S. Government Fund is a government money market fund and invests only in obligations issued or guaranteed as to principal and/or interest, as applicable, by the U.S. government or its agencies and instrumentalities, as well as repurchase agreements secured by such instruments. The Fund will provide shareholders with at least sixty (60) days' prior notice of any change in this investment policy. The Fund may hold a portion of its assets in cash pending investment, to satisfy redemption requests or to meet the Fund's other cash management needs.

The Fund follows a disciplined investment process that attempts to provide stability of principal, liquidity and current income, by investing in U.S. government securities. Among other things, SSGA FM conducts its own credit analyses of potential investments and portfolio holdings, and relies substantially on a dedicated short-term credit research team. The Fund invests in accordance with regulatory requirements applicable to money market funds. Regulations require, among other things, a money market fund to invest only in short-term, high quality debt obligations (generally, securities that have remaining maturities of 397 calendar days or less, with the exception of certain floating rate securities that may have final maturities longer than 397 days but use maturity shortening provisions to meet the 397 day requirement, and that the Fund believes present minimal credit risk), to maintain a maximum dollar-weighted average maturity and dollar-weighted average life of sixty (60) days or less and 120 days or less, respectively, and to meet requirements as to portfolio diversification and liquidity. All securities held by the Fund are U.S. dollar-denominated, and they may have fixed, variable or floating interest rates.

The Fund attempts to meet its investment objective by investing in:

•

Repurchase agreements collateralized by U.S. government securities.

Additional Information About Risks

Counterparty Risk (principal risk for the ILR Government Fund, Treasury Plus Fund and U.S. Government Fund). A Fund will be subject to credit risk with respect to the counterparties with which a Fund enters into repurchase agreements and other transactions. If a counterparty fails to meet its contractual obligations, a Fund may be unable to terminate the transaction, and it may be delayed or prevented from realizing on any collateral in the event of a bankruptcy or insolvency proceeding relating to the counterparty.

Credit Risk (principal risk for the ILR Government Fund, Treasury Plus Fund and U.S. Government Fund). Credit risk is the risk that an issuer, guarantor or liquidity provider of a fixed-income security held by a Fund may be unable or unwilling, or may be perceived (whether by market participants, ratings agencies, pricing services or otherwise) as unable or unwilling, to make timely principal and/or interest payments, or to otherwise honor its obligations. It includes the risk that the security will be downgraded by a credit rating agency; generally, lower credit quality issuers present higher credit risks. An actual or perceived decline in creditworthiness of an issuer of a fixed-income security held by a Fund may result in a decrease in the value of the security. It is possible that the ability of an issuer to meet its obligations will decline substantially during the period when a Fund owns securities of the issuer or that the issuer will default on its obligations or that the obligations of the issuer will be limited or restructured.

Income Risk (principal risk for the ILR Government Fund and U.S. Government Fund). A Fund's income may decline due to falling interest rates or other factors. Issuers of securities held by a Fund may call or redeem the securities during periods of falling interest rates, and the Fund would likely be required to reinvest in securities paying lower interest rates. If an obligation held by a Fund is prepaid, the Fund may have to reinvest the prepayment in other obligations paying income at lower rates. A reduction in the income earned by a Fund may limit the Fund's ability to achieve its objective.

uid, more volatile, and more difficult to price. A Portfolio or Fund may hold a relatively large proportion of its assets in cash in anticipation of large redemptions, diluting its investment returns. A number of circumstances may cause a Portfolio or a Fund to experience large redemptions, such as changes in investors' circumstances; changes in the eligibility criteria for a Portfolio or a Fund or share class of the Fund; liquidations, reorganizations, repositionings, or other announced Portfolio or Fund events; or changes in investment objectives, strategies, policies, risks, or investment personnel.

Market Disruption and Geopolitical Risk. A Fund is subject to the risk that geopolitical events will disrupt securities markets and adversely affect global economies and markets. War, terrorism, and related geopolitical events have led, and in the future may lead, to increased short-term market volatility and may have adverse long-term effects on U.S. and world economies and markets generally. Likewise, trade policy changes or disputes, natural and environmental disasters, pandemics and epidemics, and systemic market dislocations may be highly disruptive to economies and markets. Those events, as well as other changes in foreign and domestic economic and political conditions, also could adversely affect individual issuers or related groups of issuers, securities markets, interest rates, credit ratings, inflation, investor sentiment, and other factors affecting the value of a Fund's investments. Given the increasing interdependence among global economies and markets, conditions in one country, market, or region might adversely affect markets, issuers, and/or foreign exchange rates in other countries, including the U.S. Any partial or complete dissolution of the Economic and Monetary Union of the European Union, or any increased uncertainty as to its status, could have significant adverse effects on currency and financial markets, and on the values of a Fund's investments. On January 31, 2020, the United Kingdom (“UK”) formally withdrew from the European Union (“EU”) (commonly known as “Brexit”). An agreement between the UK and the EU governing their future trade relationship became effective January 1, 2021, but that agreement does not include an agreement on financial services, and it is unlikely that such agreement will be concluded. Moreover, the UK government has started a program of financial services law reform with the ultimate aim of repealing many EU financial services laws that were assimilated into UK law from January 1, 2021, and replacing them with legislation or rules made by the UK government or financial services regulators. Accordingly, uncertainty remains in certain areas as to the future relationship between the UK and the EU. Brexit has already had a significant impact on the UK, Europe, and global economies, and could continue to result in volatility and illiquidity, legal, political, economic and regulatory uncertainties and lower economic growth for these economies that could in turn have an adverse effect on the value of the Fund's investments. Any further exits from the EU, or the possibility of such exits, or the abandonment of the euro, may cause additional market disruption globally and introduce new legal and regulatory uncertainties.

Mortgage-Related and Other Asset-Backed Securities Risk (principal risk for the ILR Government Fund and U.S. Government Fund). Investments in mortgage-related and other asset-backed securities are subject to the risk of significant credit downgrades, illiquidity, and defaults to a greater extent than many other types of fixed income investments. The

liquidity of mortgage-related and asset-backed securities may change over time. Mortgage-related securities represent a participation in, or are secured by, mortgage loans. Other asset-backed securities are typically structured like mortgage-related securities, but instead of mortgage loans or interests in mortgage loans, the underlying assets may include, for example, items such as motor vehicle installment sales or installment loan contracts, leases on various types of real and personal property, and receivables from credit card agreements. During periods of falling interest rates, mortgage-related and other asset-backed securities, which typically provide the issuer with the right to prepay the security prior to maturity, may be prepaid, which may result in a Fund having to reinvest the proceeds in other investments at lower interest rates. During periods of rising interest rates, the average life of mortgage-related and other asset-backed securities may extend because of slower-than expected principal payments. This may lock in a below market interest rate, increase the security's duration and interest rate sensitivity, and reduce the value of the security. As a result, mortgage-related and other asset-backed securities may have less potential for capital appreciation during periods of declining interest rates than other debt securities of comparable maturities, although they may have a similar risk of decline in market values during periods of rising interest rates. Prepayment rates are difficult to predict and the potential impact of prepayments on the value of a mortgage-related or other asset-backed security depends on the terms of the instrument and can result in significant volatility. The price of a mortgage-related or other asset-backed security also depends on the credit quality and adequacy of the underlying assets or collateral. Mortgage-related or other asset-backed securities issued by non-governmental issuers (such as commercial banks, savings and loan institutions, private mortgage insurance companies, mortgage bankers and other secondary market issuers) will generally entail greater credit risk than obligations guaranteed by the U.S. government. Defaults on the underlying assets, if any, may impair the value of a mortgage-related or other asset-backed security. For some asset-backed securities in which a Fund invests, such as those backed by credit card receivables, the underlying cash flows may not be supported by a security interest in a related asset. Moreover, the values of mortgage-related and other asset-backed securities may be substantially dependent on the servicing of the underlying asset pools, and are therefore subject to risks associated with the negligence or malfeasance by their servicers and to the credit risk of their servicers. In certain situations, the mishandling of related documentation may also affect the rights of securities holders in and to the underlying collateral. There may be legal and practical limitations on the enforceability of any security interest granted with respect to underlying assets, or the value of the underlying assets, if any, may be insufficient if the issuer defaults.

Repurchase Agreement Risk (principal risk for the ILR Government Fund, Treasury Plus Fund and U.S. Government Fund). A repurchase agreement is an agreement to buy a security from a seller at one price and a simultaneous agreement to sell it back to the original seller at an agreed-upon price, typically representing the purchase price plus interest. Repurchase agreements may be viewed as loans made by a Fund, which are collateralized by the securities subject to repurchase. A Fund's investment return on such transactions will depend on the counterparty's willingness and ability to perform its obligations under a repurchase agreement. If a Fund's counterparty should default on its obligations and a Fund is delayed or prevented from recovering the collateral, or if the value of the collateral is insufficient, a Fund may realize a loss.

the changes in market rates or may have limits on the maximum increases in coupon rates. Alternatively, during periods of declining interest rates, the coupon rates on such securities will typically readjust downward resulting in a lower yield. A Fund may also invest in variable or floating rate equity securities, whose dividend payments vary based on changes in market rates of interest or other factors.

Additional Information About Non-Principal Investment Strategies and Risks

that certain risks have not been identified, given the evolving nature of this threat. The use of artificial intelligence (“AI”) and machine learning could exacerbate these risks or result in cyber security incidents that implicate personal data. Each Fund relies on third-party service providers for many of its day-to-day operations, and will be subject to the risk that the protections and protocols implemented by those service providers will be ineffective to protect the Fund from cyber-attack. The Adviser does not control the cybersecurity plans and systems put in place by third-party service providers, and such third-party service providers may have limited indemnification obligations to the Adviser or the Funds. Similar types of cybersecurity risks or technical malfunctions also are present for issuers of securities in which each Fund invests, which could result in material adverse consequences for such issuers, and may cause a Fund's investment in such securities to lose value.

Portfolio Holdings Disclosure

The Funds' portfolio holdings disclosure policy is described in the Statement of Additional Information (“SAI”).

Management and Organization

Investment Adviser

Each Fund has entered into an investment advisory agreement with the Adviser pursuant to which the Adviser will manage the Fund's assets directly, for compensation paid at an annual rate of 0.05% of the Fund's average daily net assets, in the event that the Fund were to cease investing substantially all of its assets in its corresponding Portfolio or another investment company with essentially the same investment objectives and policies as the Fund. The Adviser does not receive any management fees from a Fund under that agreement so long as the Fund continues to invest substantially all of its assets in the corresponding Portfolio or in another investment company with essentially the same investment objectives and policies as the Fund. The Adviser places all orders for purchases and sales of the Portfolios' investments. Prior to March 10, 2025, the ILR Government Fund invested substantially all of its investable assets in State Street Money Market Portfolio. For the year ended December 31, 2024, the effective management fee paid, reflecting certain fee waivers and expense reimbursements of the Adviser, was 0.05% of State Street Money Market Portfolio, 0.05% for Treasury Portfolio, 0.05% for Treasury Plus Portfolio and 0.05% for U.S. Government Portfolio.

Total Annual Fund Operating Expense Waivers. SSGA FM, as the investment adviser to each Fund is contractually obligated, through April 30, 2026 (i) to waive up to the full amount of the advisory fee payable by each Fund, and/or (ii) to reimburse a Fund for expenses to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, extraordinary expenses, acquired fund fees, any class-specific expenses, such as distribution, shareholder servicing, sub-transfer agency and administration fees) exceed 0.07% of average daily net assets on an annual basis (the “Total Annual Fund Operating Expense Waiver”). The Total Annual Fund Operating Expense Waiver may not be terminated prior to April 30, 2026 with respect to any Fund except with approval of the Board.

In addition to any contractual expense limitation for a Fund, which is described above, each of the Adviser and State Street Global Advisors Funds Distributors, LLC (each a “Service Provider”) may voluntarily reduce all or a portion of its fees and/or reimburse expenses for a Fund or a share class to the extent necessary to maintain a certain minimum net yield, which may vary from time to time in SSGA FM's sole discretion (any such waiver or reimbursement of expenses

being referred to herein as a “Voluntary Reduction”). The Adviser may, in its sole discretion, implement the Voluntary Reduction for some Funds, or some share classes of a Fund, and not others. The amount of any Voluntary Reduction may differ between Funds and share classes in the Adviser's sole discretion. The business objectives of the Adviser and its affiliates and their broader relationships with certain Fund shareholders, Financial Intermediaries or distribution channels could give the Adviser an incentive to implement the Voluntary Reduction for some Funds or share classes and not others, or to implement it to a greater degree for some Funds or share classes than others. Under an agreement with the Service Providers relating to the Voluntary Reduction, the Funds and the Portfolios have agreed to reimburse the Service Providers for the full dollar amount of any Voluntary Reduction beginning on May 1, 2020, subject to certain limitations. Each Service Provider may, in its sole discretion, irrevocably waive receipt of any or all reimbursement amounts due from a Fund.

A reimbursement to the Service Provider would increase fund expenses and may negatively impact a Fund's yield during such period. There is no guarantee that the Voluntary Reduction will be in effect at any given time or that a Fund will be able to avoid a negative yield. The Funds have agreed, subject to certain limitations, to reimburse the applicable Service Provider for the full dollar amount of any Voluntary Reduction incurred after May 1, 2020. The Fund is not obligated to reimburse a Service Provider: (1) more than three years after the end of the fiscal year of the Fund in which the Service Provider provided a Voluntary Reduction; (2) in respect of any business day for which the net annualized one-day yield of the Fund or applicable Class is less than 0.00%; (3) to the extent that the amount of the reimbursement to all Service Providers on any day exceeds fifty percent of the yield (net of all expenses, exclusive of the reimbursement) of the Fund or the applicable class on that day; (4) to the extent that the amount of such reimbursement would cause the Fund's or applicable class's net yield to fall below the Fund's or applicable class's minimum yield; (5) in respect of any such fee waivers and/or expense reimbursements that are necessary to maintain the Fund's Contractual Total Expense Limit (as defined in the Reimbursement Agreement) which is effective at the time of such fee waivers and/or expense reimbursements; or (6) in any manner that would result in a class bearing the cost of a reimbursement to the Service Provider for any class-specific expense (including, without limitation, fees payable in accordance with a plan authorized pursuant to Rule 12b-1 under the 1940 Act, or Shareholder Servicing Agreement or similar arrangement) that was waived or reimbursed to the Fund with respect to a different Class. Any such future reimbursement of an applicable Service Provider may result in the total annual operating expenses with respect to a share class of a Fund exceeding the amount of the expense cap under the contractual expense limitation agreement because the expense is not covered by the agreement.

A discussion regarding the Board's consideration of the Funds' Investment Advisory Agreement is provided in the Funds' Form N-CSR filing with the SEC for the period ended June 30, 2024.

The Administrator, Sub-Administrator and Custodian

The Adviser serves as administrator of each Fund. The amount of the fee paid to the Adviser for administrative services may vary by share class. Each Fund currently pays the Adviser an administrative fee at the annual rate of 0.05% in respect of the class of shares in this Prospectus. State Street Bank and Trust Company (“State Street”), a subsidiary of State Street Corporation, serves as the sub-administrator for the Funds for a fee that is paid by the Adviser. State Street also serves as custodian of the Funds for a separate fee that is paid by the Funds. SSGA FM serves as administrator of the Portfolios and State Street serves as sub-administrator and custodian of the Portfolios.

The Transfer Agent and Dividend Disbursing Agent

SS&C GIDS, Inc. is the Funds' transfer agent and dividend disbursing agent (the “Transfer Agent”).

The Distributor

State Street Global Advisors Funds Distributors, LLC serves as the Funds' distributor (“SSGA FD”) pursuant to the Distribution Agreement between SSGA FD and the Trust.

The Shareholder Servicing Agent

Additional Information

Shareholder Information

Determination of Net Asset Value

For all Funds

Investing in State Street Institutional Investment Trust Shares

Purchasing Shares

The Funds offer one class of shares through this Prospectus: Bancroft Capital Class is available to you subject to the eligibility requirements set forth below. Bancroft Capital Class shares may be purchased through certain Financial Intermediaries or, if you are a client of Bancroft Capital, LLC or its affiliates, through accounts maintained with Bancroft Capital, LLC or its affiliates. Bancroft Capital, LLC or your Financial Intermediary may impose policies, limitations and fees, which are different than those described herein. All classes of a Fund share the same investment objective and investments, but the different share classes have different expense structures and eligibility requirements. You should choose the class with the expense structure that best meets your needs for which you are eligible. In choosing a share class, you should consider the amount you plan to invest. Your investment professional can help you choose the share class that best suits your investment needs.

The chart below summarizes the features of the share class. This chart is only a general summary, and you should read the description of each Fund's expenses in each Fund Summary in this Prospectus.

Any applicable minimum purchase amount may be waived for specific investors or types of investors, including, without limitation, retirement plans, employees of State Street Corporation and its affiliates and their family. In the case of shareholders purchasing shares through a Financial Intermediary, the minimum purchase amount may be applied at the level of the Financial Intermediary.

	Bancroft Capital Class
Minimum Initial Investment	$25,000,000
Maximum Investment	None.
Initial Sales Charge	None. Entire purchase price is invested in shares of a Fund.
Deferred (CDSC) Sales Charge	None.
Distribution and/or Service (12b-1) Fees	None.

Investors pay no sales load to invest in the shares of the Funds. The price for Fund Shares is the NAV per share.

Purchase requests received by a Fund in good order (a purchase request is in good order if it meets the requirements implemented from time to time by the Transfer Agent or authorized agent of the Fund, and for new accounts includes
submission of a completed and signed application and all documentation necessary to open an account) on a Business Day will, if payment is received by FedWire, be priced at the NAV next determined after the order is accepted by the Fund. Payments received by FedWire prior to the last Valuation Times will earn dividend accrual for that purchase.

The minimum initial investment in Bancroft Capital Class shares of the Funds is $25 million, although the Adviser may waive the minimum in its discretion. Holdings of related customer accounts may be aggregated for purposes of determining the minimum investment amount. “Related customer accounts” may include but are not limited to accounts held

by the same investment or retirement plan, financial institution, broker, dealer or intermediary. The Funds and the Adviser reserve the right to increase or decrease the minimum amount required to open or maintain an account. There is no minimum subsequent investment, except in relation to maintaining certain minimum account balances (See “Redeeming Shares” below). The Funds require prior notification of subsequent investments in excess of $10 million for the Treasury Fund and $50 million for the ILR Government Fund, Treasury Plus Fund and U.S. Government Fund.

How to Purchase Shares

By Mail:

An initial investment in the Funds must be preceded or accompanied by a completed, signed Institutional Account

Application Form, sent to:

State Street Funds

P.O. Box 219737

Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds

801 Pennsylvania Avenue, Suite 219737

Kansas City, MO 64105-1307

By Telephone/Fax:

An initial investment in the Funds must be preceded or accompanied by a completed, signed Institutional Account

Application Form, faxed to (816) 218-0400. Call the Fund at (866) 392-0869 between the hours of 8:00 a.m. ET

and 6:00 p.m. ET to:

➢ confirm receipt of the faxed Institutional Account Application Form (initial purchases only),

➢ request your new account number (initial purchases only),

➢ confirm the amount being wired and wiring bank, and

➢ receive a confirmation number for your purchase order (your trade is not effective until you have received a

confirmation number from the Fund).

For your initial investment, send the original, signed Institutional Account Application Form to the address above.

Wire Instructions:

Instruct your bank to transfer money by Federal Funds wire to:

State Street Bank and Trust Company

1 Iron Street

Boston, MA 02210

ABA# 011000028

DDA# 9904-631-0

State Street Institutional Investment Trust

Fund Name

Class Name

Account Number

Account Registration

On Columbus Day and Veterans Day, you will not be able to purchase shares by wiring Federal Funds because the

Federal Funds wiring does not occur on those days. Payment for Fund Shares must be in Federal Funds (or

converted to Federal Funds by the Transfer Agent) by the close of the Federal Reserve.

The Funds and the Funds' agents are not responsible for transfer errors by the sending or receiving bank and will

not be liable for any loss incurred due to a wire transfer not having been received.

Redeeming Shares

An investor may redeem all or any portion of its investment. Redemption orders are processed at the NAV next determined after a Fund receives a redemption order in good form.

For any period during which there is a non-routine closure of the Fedwire or applicable Federal Reserve Banks;

For any period (1) during which the NYSE is closed other than customary week-end and holiday closings or (2) during which trading on the NYSE is restricted;

For any period during which the SEC has, by rule or regulation, deemed that (1) trading shall be restricted or (2) an emergency exists;

For any period that the SEC, may by order permit for your protection; or

A Fund may pay all or a portion of your redemption proceeds by giving you securities (for example, if the Fund reasonably believes that a cash redemption may have a substantial impact on the Fund and its remaining shareholders). A redemption is generally a taxable event for shareholders, regardless of whether the redemption is satisfied in cash or in kind. You may pay transaction costs and/or taxes to dispose of the securities, and you may receive less for them than the price at which they were valued for purposes of the redemption. In addition, you will be subject to the market risks associated with such securities until such time as you choose to dispose of the security.

How to Redeem Shares


By Mail:	Send a signed letter to: State Street Institutional Investment Trust Funds P.O. Box 219737 Kansas City, MO 64121-9737
	The letter should include information necessary to process your request as described below. The Fund may require a medallion guarantee in certain circumstances. See “Medallion Guarantees” below.
By Overnight:	State Street Institutional Investment Trust Funds 801 Pennsylvania Avenue, Suite 219737 Kansas City, MO 64105-1307
By Telephone:	Please call (866) 392-0869 between the hours of 8:00 a.m. and 6:00 p.m. ET.
The Funds will need the following information to process your redemption request:
➢ name(s) of account owners; ➢ account number(s); ➢ the name of the Fund; ➢ your daytime telephone number; and ➢ the dollar amount or number of shares being redeemed.

On any day that the Funds calculate their NAVs earlier than normal, the Funds reserve the right to adjust the times noted above for purchasing and redeeming shares.

Medallion Guarantees. Certain redemption requests must include a medallion guarantee for each registered account owner if any of the following apply:

•

Your account address has changed within the last 10 Business Days.

•

Redemption proceeds are being transferred to an account with a different registration.

•

A wire is being sent to a financial institution other than the one that has been established on your Fund account.

•

Other unusual situations as determined by the Transfer Agent.

The Funds may terminate the receipt of redemption orders by telephone at any time, in which case you may redeem shares by other means.

If you choose to purchase or redeem shares by sending instructions by regular mail, they will not be deemed received in good order until they are released by the post office and redelivered to the Transfer Agent's physical location at 801 Pennsylvania Avenue, Suite 219737 in Kansas City, MO 64105-1307. There will be a time lag, which may be one or more days, between regular mail receipt at the post office box and redelivery to such physical location in Kansas City, and a Fund's NAV may change over those days. You might consider using express rather than regular mail if you believe the time of receipt of your transaction request to be sensitive.

Exchanging Shares

An exchange occurs when you use the proceeds from the redemption of shares of a Fund in the State Street Institutional Investment Trust to simultaneously purchase shares of a different Fund in the State Street Institutional Investment Trust. Exchanges may be made between different Funds within the same class (i.e., Bancroft Capital Class shares for Bancroft Capital Class shares). The account holding the original shares must be registered in the same name as the account holding the new shares received in the exchange. You may make exchange requests by telephone, or by mail. See Purchasing Shares and Redeeming Shares. Exchanges are subject to the terms applicable to the purchases of the fund into which you are exchanging. Exchange privileges may not be available for mutual funds advised by SSGA FM (the “State Street Funds”) and may be suspended or rejected.

Excessive Trading

Delivery of Documents to Accounts Sharing an Address

To reduce expenses, we may mail only one copy of the Funds' Prospectus and each annual and semi-annual report to those addresses shared by two or more accounts. If you wish to receive individual copies of these documents, please call us at (866) 392-0869, or contact your financial institution. We will begin sending you individual copies thirty (30) days after receiving your request.

Unclaimed Property

Many states have unclaimed property rules that provide for transfer to the state (also known as “escheatment”) of unclaimed property under various circumstances. These circumstances include inactivity (e.g., no owner-initiated contact for a certain period), returned mail (e.g., when mail sent to a shareholder is returned by the post office as undeliverable), or a combination of both inactivity and returned mail. If a State Street Fund identifies property as unclaimed, it will attempt to contact the shareholder, but if that attempt is unsuccessful, the account may be considered abandoned and escheated to the state after the passage of a certain period of time (as required by applicable state law).

Dividends, Distributions and Tax Considerations

An additional 3.8% Medicare contribution tax is imposed on the “net investment income” of individuals, estates and trusts to the extent their income exceeds certain threshold amounts. Net investment income generally includes for this purpose dividends paid by a Fund and net gains recognized on the redemption (or other taxable disposition) of Fund Shares.

Financial Intermediary Arrangements

Payments to Financial Intermediaries

Third-Party Transactions. The State Street Funds have authorized certain Financial Intermediaries to accept purchase, redemption and exchange orders on the State Street Funds' behalf. Orders received for a State Street Fund by a Financial Intermediary that has been authorized to accept orders on the Fund's behalf (or other Financial Intermediaries designated by the Financial Intermediary) will be deemed accepted by the Fund at the time they are received by the Financial Intermediary and will be priced based on the Fund's next NAV determination as long as the Financial Intermediary transmits the order in good form and in a timely manner to the applicable State Street Fund(s). The Financial Intermediary is responsible for transmitting your orders and associated funds in good form and in a timely manner to the applicable State Street Fund(s). The State Street Funds will not be responsible for delays by the Financial Intermediary in transmitting your orders, including timely transfer of payment, to a Fund.

Financial Highlights

The financial highlight tables are intended to help you understand each Fund's financial performance for the past five fiscal years or, if shorter, the period since each class' inception. Certain information reflects the performance results for a single Fund Share. The total returns in the tables represent the rate that an investor would have earned (or lost) on an investment in each Fund (assuming reinvestment of all dividends and distributions). This information has been audited by Ernst & Young LLP, the Trust's independent registered public accounting firm, whose report, along with each Fund's financial highlights and financial statements, is included in each Fund's Form N-CSR filing, which is available upon request. Any references to Notes in these financial highlight tables refer to the “Notes to Financial Statements” section of each Fund's financial statements, and the financial information included in these tables should be read in conjunction with the financial statements incorporated by reference in the SAI.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL LIQUID RESERVES GOVERNMENT MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Bancroft Capital Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	For the Period 10/13/21*- 12/31/21
Net asset value, beginning of period	$1.0003	$1.0000	$0.9999	$1.0000
Income (loss) from investment operations:
Net investment income (loss)	0.0519	0.0512	0.0167	0.0000 (b)
Net realized and unrealized gain (loss)	(0.0001 )	0.0003	0.0001	(0.0001 )
Total from investment operations	0.0518	0.0515	0.0168	(0.0001 )
Distributions to shareholders from:
Net investment income	(0.0519 )	(0.0512 )	(0.0167 )	(0.0000 )(b)
Net asset value, end of period	$1.0002	$1.0003	$1.0000	$0.9999
Total return (c)	5.30 %	5.26 %	1.70 %	(0.01 )%
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$16,335	$300,048	$50	$50
Ratios to Average Net Assets:
Total expenses	0.14 %	0.15 %	0.14 %	0.15 %(d)
Net expenses	0.14 %	0.15 %	0.14 %	0.15 %(d)
Net investment income (loss)	5.36 %	5.44 %	1.69 %	0.01 %(d)

*	Commencement of operations.
(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(d)	Annualized.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL TREASURY MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Bancroft Capital Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	For the Period 10/13/21*- 12/31/21
Net asset value, beginning of period	$1.0000	$1.0000	$1.0000	$1.0000
Income (loss) from investment operations:
Net investment income (loss)	0.0506	0.0486	0.0144	0.0001
Net realized gain (loss)	0.0000 (b)	0.0000 (b)	(0.0002 )	0.0001
Total from investment operations	0.0506	0.0486	0.0142	0.0002
Distributions to shareholders from:
Net investment income	(0.0506 )	(0.0486 )	(0.0142 )	(0.0001 )
Net realized gains	—	—	—	(0.0001 )
Total distributions	(0.0506 )	(0.0486 )	(0.0142 )	(0.0002 )
Net asset value, end of period	$1.0000	$1.0000	$1.0000	$1.0000
Total return (c)	5.18 %	4.97 %	1.43 %	0.00 %(d)
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$50	$50	$50	$50
Ratios to Average Net Assets:
Total expenses	0.14 %	0.14 %	0.14 %	0.15 %(e)
Net expenses	0.14 %	0.14 %	0.13 %	0.05 %(e)
Net investment income (loss)	5.23 %	4.86 %	1.44 %	0.01 %(e)

*	Commencement of operations.
(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(d)	Amount is less than 0.005%.
(e)	Annualized.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL TREASURY PLUS MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Bancroft Capital Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	For the Period 10/13/21*- 12/31/21
Net asset value, beginning of period	$1.0000	$1.0000	$1.0000	$1.0000
Income (loss) from investment operations:
Net investment income (loss)	0.0508	0.0492	0.0157	0.0001
Net realized gain (loss)	(0.0000 )(b)	0.0000 (b)	—	0.0000 (b)
Total from investment operations	0.0508	0.0492	0.0157	0.0001
Distributions to shareholders from:
Net investment income	(0.0508 )	(0.0492 )	(0.0157 )	(0.0001 )
Net asset value, end of period	$1.0000	$1.0000	$1.0000	$1.0000
Total return (c)	5.20 %	5.04 %	1.59 %	0.00 %(d)
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$50	$50	$50	$50
Ratios to Average Net Assets:
Total expenses	0.14 %	0.14 %	0.14 %	0.15 %(e)
Net expenses	0.14 %	0.14 %	0.13 %	0.05 %(e)
Net investment income (loss)	5.08 %	4.92 %	1.59 %	0.02 %(e)

*	Commencement of operations.
(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(d)	Amount is less than 0.005%.
(e)	Annualized.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL U.S. GOVERNMENT MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Bancroft Capital Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	For the Period 10/13/21*- 12/31/21
Net asset value, beginning of period	$1.0000	$1.0000	$1.0000	$1.0000
Income (loss) from investment operations:
Net investment income (loss)	0.0508	0.0491	0.0157	0.0001
Net realized gain (loss)	(0.0000 )(b)	0.0000 (b)	0.0000 (b)	0.0000 (b)
Total from investment operations	0.0508	0.0491	0.0157	0.0001
Distributions to shareholders from:
Net investment income	(0.0508 )	(0.0491 )	(0.0157 )	(0.0001 )
Net asset value, end of period	$1.0000	$1.0000	$1.0000	$1.0000
Total return (c)	5.20 %	5.03 %	1.58 %	0.01 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$47,688	$60,365	$100	$100
Ratios to Average Net Assets:
Total expenses	0.14 %	0.14 %	0.15 %	0.14 %(d)
Net expenses	0.14 %	0.14 %	0.13 %	0.04 %(d)
Net investment income (loss)	4.97 %	5.03 %	1.46 %	0.03 %(d)

*	Commencement of operations.
(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(d)	Annualized.

Contacting the State Street Funds

Online:	www.ssga.com	24 hours a day, 7 days a week
Phone:	(877) 521-4083	Monday – Friday 8:00 am – 6:00 pm EST

Written requests should be sent to:

Regular mail	Overnight/Registered, Express, Certified Mail
State Street Funds P.O. Box 219737 Kansas City, MO 64121-9737	State Street Funds 801 Pennsylvania Avenue, Suite 219737 Kansas City, MO 64105-1307

For more information about the Funds:

The Funds' SAI includes additional information about the Funds and is incorporated by reference into this document. Additional information about the Funds' investments is available in the Funds' most recent annual and semi-annual reports to shareholders and in each Fund's Form N-CSR filing. In a Fund's Form N-CSR, you will find the Fund's annual and semi-annual financial statements. The Funds' SAI is available, without charge, upon request. The Funds' annual and semi-annual reports are available, without charge, upon request. Shareholders in the Funds may make inquiries to the Funds to receive such information by calling (877) 521-4083 or the customer service center at the telephone number shown in the accompanying contract prospectus, if applicable. Each Fund's Prospectus, SAI, annual and semi-annual reports to shareholders and other information such as each Fund's financial statements are available, free of charge, on the Funds' website at www.ssga.com.

SSGA Funds Management, Inc

ONE IRON STREET

BOSTON, MASSACHUSETTS 02210

SSIITBANCROFT PROThe State Street Institutional Investment Trust's Investment Company Act File Number is 811-09819.

Prospectus

April 30, 2025

State Street Institutional
Investment Trust

State Street Institutional Treasury Plus Money Market Fund

Blaylock Van Class (BVYXX)

State Street Institutional U.S. Government Money Market Fund

Blaylock Van Class (BUYXX)

The U.S. Securities and Exchange Commission has not approved or disapproved these securities or passed upon the adequacy of this Prospectus. Any representation to the contrary is a criminal offense.

An investment in any of the Funds offered by this Prospectus is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Each Fund may offer multiple classes of shares. This Prospectus covers only the Blaylock Van Class Shares of the applicable Funds.

TABLE OF CONTENTS

Fund Summaries	4
State Street Institutional Treasury Plus Money Market Fund	4
State Street Institutional U.S. Government Money Market Fund	9
Additional Information About Investment Objectives, Principal Strategies and Risks	15
Additional Information About Non-Principal Investment Strategies and Risks	22
Portfolio Holdings Disclosure	23
Management and Organization	24
Shareholder Information	26
Dividends, Distributions and Tax Considerations	32
Financial Intermediary Arrangements	33
Financial Highlights	35

State Street Institutional Treasury Plus Money Market Fund

Investment Objective

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Management Fee	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%
Other Expenses1	0.09%
Total Annual Fund Operating Expenses	0.14%

Other Expenses are based on estimates for the current fiscal year.

Example:

1 year	3 years	5 years	10 years
$14	$45	$79	$179

Principal Investment Strategies

Principal Risks

Market Risk: The Fund's investments are subject to changes in general economic conditions, general market fluctuations and the risks inherent in investment in securities markets. Investment markets can be volatile and prices of investments can change substantially due to various factors, including, but not limited to, economic growth or recession, changes in interest rates, inflation, changes in the actual or perceived creditworthiness of issuers, and general market liquidity. The Fund is subject to the risk that geopolitical events will disrupt securities markets and adversely affect global economies and markets. Local, regional or global events such as war, military conflicts, acts of terrorism, trade policy changes or disputes, the threat or actual imposition of tariffs, natural disasters, the spread of infectious illness or other public health issues, or other events could have a significant impact on the Fund and its investments.

Performance

The bar chart and table below provide some indication of the risks of investing in the Treasury Plus Fund by illustrating the variability of the Fund's returns for Blaylock Van Class shares from year-to-year. The bar chart shows how the Blaylock Van Class shares' returns have varied for each full calendar year shown. For periods prior to October 19, 2021, the inception date for Blaylock Van Class shares, the performance information shown is that of the Premier Class shares of the Fund, which are not offered in this Prospectus, adjusted to reflect the higher class-related operating fees and expenses of Blaylock Van Class shares. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (877) 521-4083 or by visiting our website at www.ssga.com.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	1.33%	Q4 2023
Lowest Quarterly Return	0.01%	Q1 2022

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Ten Years	Inception Date
Blaylock Van Class	5.20 %	2.44 %	1.70 %	10/19/2021

To obtain the Fund's current yield, please call (877) 521-4083.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Blaylock Van Class
To establish an account	$25,000,000
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

You may purchase or redeem Fund Shares by written request or wire transfer. Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Telephone:

By Intermediary:

Financial Intermediaries may contact SS&C GIDS, Inc. at (877) 332-6207 or via email at nsccresearch@dstsystems.com with questions.

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

State Street Institutional U.S. Government Money Market Fund

Investment Objective

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Management Fee	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%
Other Expenses1	0.09%
Total Annual Fund Operating Expenses	0.14%

Other Expenses are based on estimates for the current fiscal year.

Example:

1 year	3 years	5 years	10 years
$14	$45	$79	$179

Principal Investment Strategies

The Fund attempts to meet its investment objective by investing in:

•

Repurchase agreements collateralized by U.S. government securities.

Principal Risks

Market Risk: The Fund's investments are subject to changes in general economic conditions, general market fluctuations and the risks inherent in investment in securities markets. Investment markets can be volatile and prices of investments can change substantially due to various factors, including, but not limited to, economic growth or recession, changes in interest rates, inflation, changes in the actual or perceived creditworthiness of issuers, and general market liquidity. The Fund is subject to the risk that geopolitical events will disrupt securities markets and adversely affect global economies and markets. Local, regional or global events such as war, military conflicts, acts of terrorism, trade policy changes or disputes, the threat or actual imposition of tariffs, natural disasters, the spread of infectious illness or other public health issues, or other events could have a significant impact on the Fund and its investments.

Performance

The bar chart and table below provide some indication of the risks of investing in the U.S. Government Fund by illustrating the variability of the Fund's returns for Blaylock Van Class shares from year-to-year. The bar chart shows how the Blaylock Van Class shares' returns have varied for each full calendar year shown. For periods prior to October 19, 2021, the inception date for Blaylock Van Class shares, the performance information shown is that of the Premier Class shares of the Fund, which are not offered in this Prospectus, adjusted to reflect the higher class-related operating fees and expenses of Blaylock Van Class shares. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (877) 521-4083 or by visiting our website at www.ssga.com.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	1.33%	Q4 2023
Lowest Quarterly Return	0.01%	Q1 2022

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Ten Years	Inception Date
Blaylock Van Class	5.20 %	2.44 %	1.71 %	10/19/2021

To obtain the Fund's current yield, please call (877) 521-4083.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Blaylock Van Class
To establish an account	$25,000,000
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

You may purchase or redeem Fund Shares by written request or wire transfer. Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Telephone:

By Intermediary:

Financial Intermediaries may contact SS&C GIDS, Inc. at (877) 332-6207 or via email at nsccresearch@dstsystems.com with questions.

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

Additional Information About Investment Objectives, Principal Strategies and Risks

Investment Objective

The investment objective of each of the Treasury Plus Fund and U.S. Government Fund, as stated in each Fund's Summary, may be changed without shareholder approval.

Treasury Plus Fund

Principal Investment Strategies

The Treasury Plus Fund is a government money market fund and attempts to meet its investment objective by investing only in U.S. Treasury bills, notes and bonds (which are direct obligations of the U.S. government) and repurchase agreements collateralized by these obligations. The Fund will provide shareholders with at least sixty (60) days' prior notice of any change in this investment policy. The Fund may hold a portion of its assets in cash pending investment, to satisfy redemption requests or to meet the Fund's other cash management needs.

U.S. Government Fund

Principal Investment Strategies

The U.S. Government Fund is a government money market fund and invests only in obligations issued or guaranteed as to principal and/or interest, as applicable, by the U.S. government or its agencies and instrumentalities, as well as repurchase agreements secured by such instruments. The Fund will provide shareholders with at least sixty (60) days' prior notice of any change in this investment policy. The Fund may hold a portion of its assets in cash pending investment, to satisfy redemption requests or to meet the Fund's other cash management needs.

The Fund follows a disciplined investment process that attempts to provide stability of principal, liquidity and current income, by investing in U.S. government securities. Among other things, SSGA FM conducts its own credit analyses of potential investments and portfolio holdings, and relies substantially on a dedicated short-term credit research team. The Fund invests in accordance with regulatory requirements applicable to money market funds. Regulations require, among other things, a money market fund to invest only in short-term, high quality debt obligations (generally, securities that have remaining maturities of 397 calendar days or less, with the exception of certain floating rate securities that may have final maturities longer than 397 days but use maturity shortening provisions to meet the 397 day requirement, and that the Fund believes present minimal credit risk), to maintain a maximum dollar-weighted average maturity and dollar-weighted average life of sixty (60) days or less and 120 days or less, respectively, and to meet requirements as to portfolio diversification and liquidity. All securities held by the Fund are U.S. dollar-denominated, and they may have fixed, variable or floating interest rates.

The Fund attempts to meet its investment objective by investing in:

•

Repurchase agreements collateralized by U.S. government securities.

Additional Information About Risks

lated market prices, it will be subject to greater risk than a fund with investments that are not as closely correlated. Changes in the value of a single security or issuer or the impact of a single economic, political, or regulatory occurrence may have a greater adverse impact on the Fund's net asset value.

Market Disruption and Geopolitical Risk. A Fund is subject to the risk that geopolitical events will disrupt securities markets and adversely affect global economies and markets. War, terrorism, and related geopolitical events have led, and in the future may lead, to increased short-term market volatility and may have adverse long-term effects on U.S. and world economies and markets generally. Likewise, trade policy changes or disputes, natural and environmental disasters, pandemics and epidemics, and systemic market dislocations may be highly disruptive to economies and markets. Those events, as well as other changes in foreign and domestic economic and political conditions, also could adversely affect individual issuers or related groups of issuers, securities markets, interest rates, credit ratings, inflation, investor sentiment, and other factors affecting the value of a Fund's investments. Given the increasing interdependence among global economies and markets, conditions in one country, market, or region might adversely affect markets, issuers, and/or foreign exchange rates in other countries, including the U.S. Any partial or complete dissolution of the Economic and Monetary Union of the European Union, or any increased uncertainty as to its status, could have significant adverse effects on currency and financial markets, and on the values of a Fund's investments. On January 31, 2020, the United Kingdom (“UK”) formally withdrew from the European Union (“EU”) (commonly known as “Brexit”). An agreement between the UK and the EU governing their future trade relationship became effective January 1, 2021, but that agreement does not include an agreement on financial services, and it is unlikely that such agreement will be concluded. Moreover, the UK government has started a program of financial services law reform with the ultimate aim of repealing many EU financial services laws that were assimilated into UK law from January 1, 2021, and replacing them with legislation or rules made by the UK government or financial services regulators. Accordingly, uncertainty remains in certain areas as to the future relationship between the UK and the EU. Brexit has already had a significant impact on the UK, Europe, and global economies, and could continue to result in volatility and illiquidity, legal, political, economic and regulatory uncertainties and lower economic growth for these economies that could in turn have an adverse effect on the value of the Fund's investments. Any further exits from the EU, or the possibility of such exits, or the abandonment of the euro, may cause additional market disruption globally and introduce new legal and regulatory uncertainties.

and to restore liquidity and stability to financial systems in their jurisdictions; the implementation of such governmental interventions and their impact on both the markets generally and a Fund's investment program in particular can be uncertain. Governmental and non-governmental issuers may default on, or be forced to restructure, their debts, and other issuers may face difficulties obtaining credit. Defaults or restructurings by governments or others of their debts could have substantial adverse effects on economies, financial markets, and asset valuations around the world. Federal Reserve or other U.S. or non-U.S. governmental or central bank actions, including interest rate increases or contrary actions by different governments, or investor perception that these efforts are not succeeding, could negatively affect financial markets generally as well as the values and liquidity of certain securities.

securities, which typically provide the issuer with the right to prepay the security prior to maturity, may be prepaid, which may result in a Fund having to reinvest the proceeds in other investments at lower interest rates. During periods of rising interest rates, the average life of mortgage-related and other asset-backed securities may extend because of slower-than expected principal payments. This may lock in a below market interest rate, increase the security's duration and interest rate sensitivity, and reduce the value of the security. As a result, mortgage-related and other asset-backed securities may have less potential for capital appreciation during periods of declining interest rates than other debt securities of comparable maturities, although they may have a similar risk of decline in market values during periods of rising interest rates. Prepayment rates are difficult to predict and the potential impact of prepayments on the value of a mortgage-related or other asset-backed security depends on the terms of the instrument and can result in significant volatility. The price of a mortgage-related or other asset-backed security also depends on the credit quality and adequacy of the underlying assets or collateral. Mortgage-related or other asset-backed securities issued by non-governmental issuers (such as commercial banks, savings and loan institutions, private mortgage insurance companies, mortgage bankers and other secondary market issuers) will generally entail greater credit risk than obligations guaranteed by the U.S. government. Defaults on the underlying assets, if any, may impair the value of a mortgage-related or other asset-backed security. For some asset-backed securities in which a Fund invests, such as those backed by credit card receivables, the underlying cash flows may not be supported by a security interest in a related asset. Moreover, the values of mortgage-related and other asset-backed securities may be substantially dependent on the servicing of the underlying asset pools, and are therefore subject to risks associated with the negligence or malfeasance by their servicers and to the credit risk of their servicers. In certain situations, the mishandling of related documentation may also affect the rights of securities holders in and to the underlying collateral. There may be legal and practical limitations on the enforceability of any security interest granted with respect to underlying assets, or the value of the underlying assets, if any, may be insufficient if the issuer defaults.

Rapid Changes in Interest Rates. The values of instruments held by a Fund may be adversely affected by rapid changes in interest rates. Rapid changes in interest rates may cause significant requests to redeem Fund Shares, and possibly cause a Fund to sell portfolio securities at a loss to satisfy those requests. Significant losses could impair the Fund's ability to maintain a stable share price of $1.00.

Repurchase Agreement Risk. A repurchase agreement is an agreement to buy a security from a seller at one price and a simultaneous agreement to sell it back to the original seller at an agreed-upon price, typically representing the purchase price plus interest. Repurchase agreements may be viewed as loans made by a Fund, which are collateralized by the securities subject to repurchase. A Fund's investment return on such transactions will depend on the counterparty's willingness and ability to perform its obligations under a repurchase agreement. If a Fund's counterparty should default on its obligations and a Fund is delayed or prevented from recovering the collateral, or if the value of the collateral is insufficient, a Fund may realize a loss.

Variable and Floating Rate Securities Risk. Variable or floating rate securities are debt securities with variable or floating interest rates payments. Variable or floating rate securities bear rates of interest that are adjusted periodically according to formulae intended generally to reflect market rates of interest and allow a Fund to participate (determined in accordance with the terms of the securities) in increases in interest rates through upward adjustments of the coupon rates on the securities. However, during periods of increasing interest rates, changes in the coupon rates may lag behind the changes in market rates or may have limits on the maximum increases in coupon rates. Alternatively, during periods of declining interest rates, the coupon rates on such securities will typically readjust downward resulting in a lower yield. A Fund may also invest in variable or floating rate equity securities, whose dividend payments vary based on changes in market rates of interest or other factors.

Additional Information About Non-Principal Investment Strategies and Risks

Cybersecurity Risk. With the increased use of technologies such as the Internet and the dependence on computer systems to perform business and operational functions, funds (such as the Funds) and their service providers (including the Adviser) may be prone to operational and information security risks resulting from cyber-attacks and/or technological malfunctions. Furthermore, geopolitical tensions may have increased the scale and sophistication of deliberate cybersecurity attacks, particularly those from nation-states or from entities with nation-state backing. In general, cyber-attacks are deliberate, but unintentional events may have similar effects. Cyber-attacks include, among others, stealing or corrupting data maintained online or digitally, preventing legitimate users from accessing information or services on a website, releasing confidential information without authorization, and causing operational disruption. Successful cyber-attacks against, or security breakdowns of, a Fund, a Portfolio, the Adviser or a custodian, transfer agent, or other affiliated or third-party service provider may adversely affect a Fund or its shareholders. For instance, cyber-attacks or technical malfunctions may interfere with the processing of shareholder or other transactions, affect a Fund's ability to calculate its NAV, cause the release of private shareholder information or confidential Fund information, impede trading, cause reputational damage, and subject a Fund to regulatory fines, penalties or financial losses, reimbursement or other compensation costs, and additional compliance costs. Cyber-attacks or technical malfunctions may render records of Fund assets and transactions, shareholder ownership of Fund Shares, and other data integral to the functioning of a Fund inaccessible or inaccurate or incomplete. A Fund may also incur substantial costs for cybersecurity risk management in order to prevent cyber incidents in the future. A Fund and its shareholders could be negatively impacted as a result. While the Adviser has established business continuity plans and systems designed to minimize the risk of cyber-attacks through the use of technology, processes and controls, there are inherent limitations in such plans and systems, including the possibility that certain risks have not been identified, given the evolving nature of this threat. The use of artificial intelligence (“AI”) and machine learning could exacerbate these risks or result in cyber security incidents that implicate personal data. Each Fund relies on third-party service providers for many of its day-to-day operations, and will be subject to the risk that the protections and protocols implemented by those service providers will be ineffective to protect the Fund from cyber-attack. The Adviser does not control the cybersecurity plans and systems put in place by third-party service providers,

and such third-party service providers may have limited indemnification obligations to the Adviser or the Funds. Similar types of cybersecurity risks or technical malfunctions also are present for issuers of securities in which each Fund invests, which could result in material adverse consequences for such issuers, and may cause a Fund's investment in such securities to lose value.

Portfolio Holdings Disclosure

The Funds' portfolio holdings disclosure policy is described in the Statement of Additional Information (“SAI”).

Management and Organization

Investment Adviser

Each Fund has entered into an investment advisory agreement with the Adviser pursuant to which the Adviser will manage the Fund's assets directly, for compensation paid at an annual rate of 0.05% of the Fund's average daily net assets, in the event that the Fund were to cease investing substantially all of its assets in its corresponding Portfolio or another investment company with essentially the same investment objectives and policies as the Fund. The Adviser does not receive any management fees from a Fund under that agreement so long as the Fund continues to invest substantially all of its assets in the corresponding Portfolio or in another investment company with essentially the same investment objectives and policies as the Fund. The Adviser places all orders for purchases and sales of the Portfolios' investments. For the year ended December 31, 2024, the effective management fee paid, reflecting certain fee waivers and expense reimbursements of the Adviser, was 0.05% for Treasury Plus Portfolio and 0.05% for U.S. Government Portfolio.

may differ between Funds and share classes in the Adviser's sole discretion. The business objectives of the Adviser and its affiliates and their broader relationships with certain Fund shareholders, Financial Intermediaries or distribution channels could give the Adviser an incentive to implement the Voluntary Reduction for some Funds or share classes and not others, or to implement it to a greater degree for some Funds or share classes than others. Under an agreement with the Service Providers relating to the Voluntary Reduction, the Funds and the Portfolios have agreed to reimburse the Service Providers for the full dollar amount of any Voluntary Reduction beginning on May 1, 2020, subject to certain limitations. Each Service Provider may, in its sole discretion, irrevocably waive receipt of any or all reimbursement amounts due from a Fund.

A reimbursement to the Service Provider would increase fund expenses and may negatively impact a Fund's yield during such period. There is no guarantee that the Voluntary Reduction will be in effect at any given time or that a Fund will be able to avoid a negative yield. The Funds have agreed, subject to certain limitations, to reimburse the applicable Service Provider for the full dollar amount of any Voluntary Reduction incurred after May 1, 2020. A Fund is not obligated to reimburse a Service Provider: (1) more than three years after the end of the fiscal year of the Fund in which the Service Provider provided a Voluntary Reduction; (2) in respect of any business day for which the net annualized one-day yield of the Fund or applicable Class is less than 0.00%; (3) to the extent that the amount of the reimbursement to all Service Providers on any day exceeds fifty percent of the yield (net of all expenses, exclusive of the reimbursement) of the Fund or the applicable class on that day; (4) to the extent that the amount of such reimbursement would cause the Fund's or applicable class's net yield to fall below the Fund's or applicable class's minimum yield; (5) in respect of any such fee waivers and/or expense reimbursements that are necessary to maintain the Fund's Contractual Total Expense Limit (as defined in the Reimbursement Agreement), which is effective at the time of such fee waivers and/or expense reimbursements; or (6) in any manner that would result in a class bearing the cost of a reimbursement to the Service Provider for any class-specific expense (including, without limitation, fees payable in accordance with a plan authorized pursuant to Rule 12b-1 under the 1940 Act, or Shareholder Servicing Agreement or similar arrangement) that was waived or reimbursed to the Fund with respect to a different Class. Any such future reimbursement of an applicable Service Provider may result in the total annual operating expenses with respect to a share class of a Fund exceeding the amount of the expense cap under the contractual expense limitation agreement because the expense is not covered by the agreement.

A discussion regarding the Board's consideration of the Funds' Investment Advisory Agreement is provided in the Funds' Form N-CSR filing with the SEC for the period ended June 30, 2024.

The Administrator, Sub-Administrator and Custodian

The Adviser serves as administrator of each Fund. The amount of the fee paid to the Adviser for administrative services may vary by share class. Each Fund currently pays the Adviser an administrative fee at the annual rate of 0.05% in respect of the class of shares in this Prospectus. State Street Bank and Trust Company (“State Street”), a subsidiary of State Street Corporation, serves as the sub-administrator for the Funds for a fee that is paid by the Adviser. State Street also serves as custodian of the Funds for a separate fee that is paid by the Funds. SSGA FM serves as administrator of the Portfolios and State Street serves as sub-administrator and custodian of the Portfolios.

The Transfer Agent and Dividend Disbursing Agent

SS&C GIDS, Inc. is the Funds' transfer agent and dividend disbursing agent (the “Transfer Agent”).

The Distributor

State Street Global Advisors Funds Distributors, LLC serves as the Funds' distributor (“SSGA FD”) pursuant to the Distribution Agreement between SSGA FD and the Trust.

The Shareholder Servicing Agent

Additional Information

Shareholder Information

Determination of Net Asset Value

The Treasury Plus Fund and the U.S. Government Fund each determines its NAV per share once each Business Day (as defined below), typically at 5:00 p.m. ET (the time when a Fund determines its NAV per share is referred to herein as the “Valuation Time”). The Funds reserve the right to advance the time for accepting purchase or redemption orders and/or the Valuation Time on any day when the NYSE, bond markets (as recommended by The Securities Industry and Financial Markets Association (“SIFMA”)) or any Federal Reserve bank close early, trading on the NYSE is restricted, an emergency arises or as otherwise permitted by the SEC. The Funds reserve the right to continue to accept orders to purchase or redeem shares following the close of the NYSE on any day on which the NYSE closes early, provided that either the Federal Reserve or the bond markets remain open. In addition, the Board may, for any Business Day, decide to change the time as of which a Fund's NAV is calculated in response to new developments such as altered trading hours, or as otherwise permitted by the SEC.

Investing in State Street Institutional Investment Trust Shares

Purchasing Shares

The Funds offer one class of shares through this Prospectus: Blaylock Van Class is available to you subject to the eligibility requirements set forth below. Blaylock Van Class shares may be purchased through certain Financial Intermediaries or, if you are a client of Blaylock Van, LLC or its affiliates, through accounts maintained with Blaylock Van, LLC or its affiliates. Blaylock Van, LLC or your Financial Intermediary may impose policies, limitations and fees, which are different than those described herein. All classes of a Fund share the same investment objective and investments, but the different share classes have different expense structures and eligibility requirements. You should choose the class with the expense structure that best meets your needs for which you are eligible. In choosing a share class, you should consider the amount you plan to invest. Your investment professional can help you choose the share class that best suits your investment needs.

The chart below summarizes the features of the share class. This chart is only a general summary, and you should read the description of each Fund's expenses in each Fund Summary in this Prospectus.

Any applicable minimum purchase amount may be waived for specific investors or types of investors, including, without limitation, retirement plans, employees of State Street Corporation and its affiliates and their family. In the case of shareholders purchasing shares through a Financial Intermediary, the minimum purchase amount may be applied at the level of the Financial Intermediary.

	Blaylock Van Class
Minimum Initial Investment	$25,000,000
Maximum Investment	None.
Initial Sales Charge	None. Entire purchase price is invested in shares of a Fund.
Deferred (CDSC) Sales Charge	None.
Distribution and/or Service (12b-1) Fees	None.

Investors pay no sales load to invest in the shares of the Funds. The price for Fund Shares is the NAV per share.

The minimum initial investment in Blaylock Van Class shares of the Funds is $25 million, although the Adviser may waive the minimum in its discretion. Holdings of related customer accounts may be aggregated for purposes of determining the minimum investment amount. “Related customer accounts” may include but are not limited to accounts held by the same investment or retirement plan, financial institution, broker, dealer or intermediary. The Funds and the Adviser reserve the right to increase or decrease the minimum amount required to open or maintain an account. There is no minimum subsequent investment, except in relation to maintaining certain minimum account balances (See “Redeeming Shares” below). The Funds require prior notification of subsequent investments in excess of $50 million.

The Funds reserve the right to cease accepting investments at any time or to reject any investment order. In addition, the Treasury Plus Fund and U.S. Government Fund may limit the amount of a purchase order received after 3:00 p.m. ET.

How to Purchase Shares

By Mail:

An initial investment in the Funds must be preceded or accompanied by a completed, signed Institutional Account

Application Form, sent to:

State Street Funds

P.O. Box 219737

Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds

801 Pennsylvania Avenue, Suite 219737

Kansas City, MO 64105-1307

By Telephone/Fax:

An initial investment in the Funds must be preceded or accompanied by a completed, signed Institutional Account

Application Form, faxed to (816) 218-0400. Call the Fund at (866) 392-0869 between the hours of 8:00 a.m. ET

and 6:00 p.m. ET to:

➢ confirm receipt of the faxed Institutional Account Application Form (initial purchases only),

➢ request your new account number (initial purchases only),

➢ confirm the amount being wired and wiring bank, and

➢ receive a confirmation number for your purchase order (your trade is not effective until you have received a

confirmation number from the Fund).

For your initial investment, send the original, signed Institutional Account Application Form to the address above.

Wire Instructions:

Instruct your bank to transfer money by Federal Funds wire to:

State Street Bank and Trust Company

1 Iron Street

Boston, MA 02210

ABA# 011000028

DDA# 9904-631-0

State Street Institutional Investment Trust

Fund Name

Class Name

Account Number

Account Registration

On Columbus Day and Veterans Day, you will not be able to purchase shares by wiring Federal Funds because the

Federal Funds wiring does not occur on those days. Payment for Fund Shares must be in Federal Funds (or

converted to Federal Funds by the Transfer Agent) by the close of the Federal Reserve.

The Funds and the Funds' agents are not responsible for transfer errors by the sending or receiving bank and will

not be liable for any loss incurred due to a wire transfer not having been received.

Redeeming Shares

An investor may redeem all or any portion of its investment. Redemption orders are processed at the NAV next determined after a Fund receives a redemption order in good form.

For the U.S. Government Fund, and the Treasury Plus Fund

If the Treasury Plus Fund or the U.S. Government Fund receives a redemption order in good form prior to 5:00 p.m. ET on a Business Day, the Fund typically expects to pay out redemption proceeds on that day, but no later than the next Business Day if redemption proceeds are sent by wire or ACH.

If redemption proceeds are sent by check, the Fund pays out redemption proceeds on the next Business Day. If a full redemption order is requested, no dividends will accrue with respect to shares on the day the redemption proceeds are sent. If a redemption order is placed after 5:00 p.m. ET, the Fund typically expects to pay out redemption proceeds on the next Business Day (and dividends will accrue up to, but not including, the day that redemption proceeds are sent), but no later than the following Business Day. The Fund may postpone and/or suspend redemption and payment beyond the foregoing time periods only as follows:

For any period during which there is a non-routine closure of the Fedwire or applicable Federal Reserve Banks;

For any period (1) during which the NYSE is closed other than customary week-end and holiday closings or (2) during which trading on the NYSE is restricted;

For any period during which the SEC has, by rule or regulation, deemed that (1) trading shall be restricted or (2) an emergency exists;

For any period that the SEC, may by order permit for your protection; or

Rule 2a-7 as adopted by the SEC permits a money market fund to impose a liquidity fee upon the sale of fund shares under certain circumstances, however the Treasury Plus Fund and the U.S. Government Fund are both government money market funds that have not elected to be subject to the liquidity fee provision of Rule 2a-7. Although the Funds attempts to maintain their NAV at $1.00 per share, there can be no assurance that they will be successful, and there can be no assurance that a shareholder will receive $1.00 per share upon any redemption.

For Each Fund

A Fund may pay all or a portion of your redemption proceeds by giving you securities (for example, if the Fund reasonably believes that a cash redemption may have a substantial impact on the Fund and its remaining shareholders). A redemption is generally a taxable event for shareholders, regardless of whether the redemption is satisfied in cash or in kind. You may pay transaction costs and/or taxes to dispose of the securities, and you may receive less for them than the price at which they were valued for purposes of the redemption. In addition, you will be subject to the market risks associated with such securities until such time as you choose to dispose of the security.

How to Redeem Shares


By Mail:	Send a signed letter to: State Street Institutional Investment Trust Funds P.O. Box 219737 Kansas City, MO 64121-9737
	The letter should include information necessary to process your request as described below. The Fund may require a medallion guarantee in certain circumstances. See “Medallion Guarantees” below.
By Overnight:	State Street Institutional Investment Trust Funds 801 Pennsylvania Avenue, Suite 219737 Kansas City, MO 64105-1307
By Telephone:	Please call (866) 392-0869 between the hours of 8:00 a.m. and 6:00 p.m. ET.
The Funds will need the following information to process your redemption request:
➢ name(s) of account owners; ➢ account number(s); ➢ the name of the Fund; ➢ your daytime telephone number; and ➢ the dollar amount or number of shares being redeemed.

On any day that the Funds calculate their NAVs earlier than normal, the Funds reserve the right to adjust the times noted above for purchasing and redeeming shares.

Medallion Guarantees. Certain redemption requests must include a medallion guarantee for each registered account owner if any of the following apply:

•

Your account address has changed within the last 10 Business Days.

•

Redemption proceeds are being transferred to an account with a different registration.

•

A wire is being sent to a financial institution other than the one that has been established on your Fund account.

•

Other unusual situations as determined by the Transfer Agent.

The Funds may terminate the receipt of redemption orders by telephone at any time, in which case you may redeem shares by other means.

If you choose to purchase or redeem shares by sending instructions by regular mail, they will not be deemed received in good order until they are released by the post office and redelivered to the Transfer Agent's physical location at 801 Pennsylvania Avenue, Suite 219737 in Kansas City, MO 64105-1307. There will be a time lag, which may be one or more days, between regular mail receipt at the post office box and redelivery to such physical location in Kansas City, and a Fund's NAV may change over those days. You might consider using express rather than regular mail if you believe the time of receipt of your transaction request to be sensitive.

Exchanging Shares

An exchange occurs when you use the proceeds from the redemption of shares of a Fund in the State Street Institutional Investment Trust to simultaneously purchase shares of a different Fund in the State Street Institutional Investment Trust. Currently, exchanging shares is allowed from/to the Treasury Plus Fund and U.S. Government Fund. Exchanges may be made between different Funds within the same class (i.e., Blaylock Van Class shares for Blaylock Van Class shares). The account holding the original shares must be registered in the same name as the account holding the new shares received in the exchange. You may make exchange requests by telephone, or by mail. See Purchasing Shares and Redeeming Shares. Exchanges are subject to the terms applicable to the purchases of the fund into which you are exchanging. Exchange privileges may not be available for mutual funds advised by SSGA FM (the “State Street Funds”) and may be suspended or rejected.

Excessive Trading

Delivery of Documents to Accounts Sharing an Address

To reduce expenses, we may mail only one copy of the Funds' Prospectus and each annual and semi-annual report to those addresses shared by two or more accounts. If you wish to receive individual copies of these documents, please call us at (866) 392-0869, or contact your financial institution. We will begin sending you individual copies thirty (30) days after receiving your request.

Unclaimed Property

Many states have unclaimed property rules that provide for transfer to the state (also known as “escheatment”) of unclaimed property under various circumstances. These circumstances include inactivity (e.g., no owner-initiated contact for a certain period), returned mail (e.g., when mail sent to a shareholder is returned by the post office as undeliverable), or a combination of both inactivity and returned mail. If a State Street Fund identifies property as unclaimed, it will attempt to contact the shareholder, but if that attempt is unsuccessful, the account may be considered abandoned and escheated to the state after the passage of a certain period of time (as required by applicable state law).

Dividends, Distributions and Tax Considerations

If the NAV of Fund Shares were to vary from $1.0000 per share, shareholders generally would realize a gain or loss upon the redemption or other taxable disposition of such Fund Shares. Any such gain generally would be taxable to you as either short-term or long-term capital gain, depending upon how long you held the Fund Shares. The Internal Revenue Service (the “IRS”) has issued final regulations and published guidance that permit a simplified method of accounting for gains and losses realized upon the disposition of money market fund shares. Shareholders should see the SAI for further information.

An additional 3.8% Medicare contribution tax is imposed on the “net investment income” of individuals, estates and trusts to the extent their income exceeds certain threshold amounts. Net investment income generally includes for this purpose dividends paid by a Fund and net gains recognized on the redemption (or other taxable disposition) of Fund Shares.

Financial Intermediary Arrangements

Payments to Financial Intermediaries

Third-Party Transactions. The State Street Funds have authorized certain Financial Intermediaries to accept purchase, redemption and exchange orders on the State Street Funds' behalf. Orders received for a State Street Fund by a Financial Intermediary that has been authorized to accept orders on the Fund's behalf (or other Financial Intermediaries designated by the Financial Intermediary) will be deemed accepted by the Fund at the time they are received by the Financial Intermediary and will be priced based on the Fund's next NAV determination as long as the Financial Intermediary transmits the order in good form and in a timely manner to the applicable State Street Fund(s). The Financial Intermediary is responsible for transmitting your orders and associated funds in good form and in a timely manner to the applicable State Street Fund(s). The State Street Funds will not be responsible for delays by the Financial Intermediary in transmitting your orders, including timely transfer of payment, to a Fund.

Financial Highlights

The financial highlight tables are intended to help you understand each Fund's financial performance for the past five fiscal years or, if shorter, the period since each class' inception. Certain information reflects the performance results for a single Fund Share. The total returns in the tables represent the rate that an investor would have earned (or lost) on an investment in each Fund (assuming reinvestment of all dividends and distributions). This information has been audited by Ernst & Young LLP, the Trust's independent registered public accounting firm, whose report, along with each Fund's financial highlights and financial statements, is included in each Fund's Form N-CSR filing, which is available upon request. Any references to Notes in these financial highlight tables refer to the “Notes to Financial Statements” section of each Fund's financial statements, and the financial information included in these tables should be read in conjunction with the financial statements incorporated by reference in the SAI.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL TREASURY PLUS MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Blaylock Van Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	For the Period 10/20/21*- 12/31/21
Net asset value, beginning of period	$1.0000	$1.0000	$1.0000	$1.0000
Income (loss) from investment operations:
Net investment income (loss)	0.0509	0.0492	0.0157	0.0001
Net realized gain (loss)	(0.0001 )	0.0000 (b)	—	0.0000 (b)
Total from investment operations	0.0508	0.0492	0.0157	0.0001
Distributions to shareholders from:
Net investment income	(0.0508 )	(0.0492 )	(0.0157 )	(0.0001 )
Net asset value, end of period	$1.0000	$1.0000	$1.0000	$1.0000
Total return (c)	5.20 %	5.03 %	1.58 %	0.00 %(d)
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$14,262	$157,696	$508	$500
Ratios to Average Net Assets:
Total expenses	0.14 %	0.14 %	0.15 %	0.15 %(e)
Net expenses	0.14 %	0.14 %	0.13 %	0.05 %(e)
Net investment income (loss)	5.15 %	5.09 %	1.60 %	0.01 %(e)

*	Commencement of operations.
(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(d)	Amount is less than 0.005%.
(e)	Annualized.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL U.S. GOVERNMENT MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Blaylock Van Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	For the Period 10/20/21*- 12/31/21
Net asset value, beginning of period	$1.0000	$1.0000	$1.0000	$1.0000
Income (loss) from investment operations:
Net investment income (loss)	0.0509	0.0490	0.0156	0.0001
Net realized gain (loss)	(0.0001 )	0.0001	0.0000 (b)	0.0000 (b)
Total from investment operations	0.0508	0.0491	0.0156	0.0001
Distributions to shareholders from:
Net investment income	(0.0508 )	(0.0491 )	(0.0156 )	(0.0001 )
Net asset value, end of period	$1.0000	$1.0000	$1.0000	$1.0000
Total return (c)	5.20 %	5.03 %	1.58 %	0.01 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$311,900	$54,050	$429,773	$500
Ratios to Average Net Assets:
Total expenses	0.14 %	0.14 %	0.15 %	0.14 %(d)
Net expenses	0.14 %	0.14 %	0.15 %	0.04 %(d)
Net investment income (loss)	4.92 %	5.06 %	3.46 %	0.03 %(d)

*	Commencement of operations.
(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of their respective Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(d)	Annualized.

Contacting the State Street Funds

Online:	www.ssga.com	24 hours a day, 7 days a week
Phone:	(877) 521-4083	Monday – Friday 8:00 am – 6:00 pm EST

Written requests should be sent to:

Regular mail	Overnight/Registered, Express, Certified Mail
State Street Funds P.O. Box 219737 Kansas City, MO 64121-9737	State Street Funds 801 Pennsylvania Avenue, Suite 219737 Kansas City, MO 64105-1307

For more information about the Funds:

The Funds' SAI includes additional information about the Funds and is incorporated by reference into this document. Additional information about the Funds' investments is available in the Funds' most recent annual and semi-annual reports to shareholders and in each Fund's Form N-CSR filing. In a Fund's Form N-CSR, you will find the Fund's annual and semi-annual financial statements. The Funds' SAI is available, without charge, upon request. The Funds' annual and semi-annual reports are available, without charge, upon request. Shareholders in the Funds may make inquiries to the Funds to receive such information by calling (877) 521-4083 or the customer service center at the telephone number shown in the accompanying contract prospectus, if applicable. Each Fund's Prospectus, SAI, annual and semi-annual reports to shareholders and other information such as the Fund's financial statements are available, free of charge, on the Funds' website at www.ssga.com.

SSGA Funds Management, Inc

ONE IRON STREET

BOSTON, MASSACHUSETTS 02210

SSIITBLAYLOCK PROThe State Street Institutional Investment Trust's Investment Company Act File Number is 811-09819.

Prospectus

April 30, 2025

State Street Institutional
Investment Trust

State Street Institutional Treasury Money Market Fund

Cabrera Capital Markets Class (CSJXX)

State Street Institutional Treasury Plus Money Market Fund

Cabrera Capital Markets Class (CAJXX)

State Street Institutional U.S. Government Money Market Fund

Cabrera Capital Markets Class (CAHXX)

The U.S. Securities and Exchange Commission has not approved or disapproved these securities or passed upon the adequacy of this Prospectus. Any representation to the contrary is a criminal offense.

An investment in any of the Funds offered by this Prospectus is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Each Fund may offer multiple classes of shares. This Prospectus covers only the Cabrera Capital Markets Class Shares of the applicable Funds.

TABLE OF CONTENTS

Fund Summaries	4
State Street Institutional Treasury Money Market Fund	4
State Street Institutional Treasury Plus Money Market Fund	9
State Street Institutional U.S. Government Money Market Fund	14
Additional Information About Investment Objectives, Principal Strategies and Risks	20
Additional Information About Non-Principal Investment Strategies and Risks	27
Portfolio Holdings Disclosure	29
Management and Organization	30
Shareholder Information	32
Dividends, Distributions and Tax Considerations	38
Financial Intermediary Arrangements	39
Financial Highlights	41

State Street Institutional Treasury Money Market Fund

Investment Objective

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Management Fee	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%
Other Expenses	0.09%
Total Annual Fund Operating Expenses	0.14%

Example:

1 year	3 years	5 years	10 years
$14	$45	$79	$179

Principal Investment Strategies

Principal Risks

Market Risk: The Fund's investments are subject to changes in general economic conditions, general market fluctuations and the risks inherent in investment in securities markets. Investment markets can be volatile and prices of investments can change substantially due to various factors, including, but not limited to, economic growth or recession, changes in interest rates, inflation, changes in the actual or perceived creditworthiness of issuers, and general market liquidity. The Fund is subject to the risk that geopolitical events will disrupt securities markets and adversely affect global economies and markets. Local, regional or global events such as war, military conflicts, acts of terrorism, trade policy changes or disputes, the threat or actual imposition of tariffs, natural disasters, the spread of infectious illness or other public health issues, or other events could have a significant impact on the Fund and its investments.

Performance

The bar chart and table below provide some indication of the risks of investing in the Treasury Fund by illustrating the variability of the Fund's returns for Cabrera Capital Markets Class shares from year-to-year. The bar chart shows how the Cabrera Capital Markets Class shares' returns have varied for each full calendar year shown. For periods prior to October 19, 2021, the inception date for Cabrera Capital Markets Class shares, the performance information shown is that of the Premier Class shares of the Fund, which are not offered in this Prospectus, adjusted to reflect the higher class-related operating fees and expenses of Cabrera Capital Markets Class shares. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (877) 521-4083 or by visiting our website at www.ssga.com.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	1.33%	Q4 2023
Lowest Quarterly Return	0.01%	Q1 2022

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Ten Years	Inception Date
Cabrera Capital Markets Class	5.18 %	2.39 %	1.67 %	10/19/2021

To obtain the Fund's current yield, please call (877) 521-4083.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Cabrera Capital Markets Class
To establish an account	$25,000,000
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

To open an account with the Fund, contact Cabrera Capital Markets LLC by telephone (312-236-8888) or by e-mail at mminfo@cabreracapital.com.

You may purchase or redeem Fund Shares by written request or wire transfer. Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Telephone:

By Intermediary:

Financial Intermediaries may contact SS&C GIDS, Inc. at (877) 332-6207 or via email at nsccresearch@dstsystems.com with questions.

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

State Street Institutional Treasury Plus Money Market Fund

Investment Objective

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Management Fee	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%
Other Expenses	0.09%
Total Annual Fund Operating Expenses	0.14%

Example:

1 year	3 years	5 years	10 years
$14	$45	$79	$179

Principal Investment Strategies

Principal Risks

Market Risk: The Fund's investments are subject to changes in general economic conditions, general market fluctuations and the risks inherent in investment in securities markets. Investment markets can be volatile and prices of investments can change substantially due to various factors, including, but not limited to, economic growth or recession, changes in interest rates, inflation, changes in the actual or perceived creditworthiness of issuers, and general market liquidity. The Fund is subject to the risk that geopolitical events will disrupt securities markets and adversely affect global economies and markets. Local, regional or global events such as war, military conflicts, acts of terrorism, trade policy changes or disputes, the threat or actual imposition of tariffs, natural disasters, the spread of infectious illness or other public health issues, or other events could have a significant impact on the Fund and its investments.

Performance

The bar chart and table below provide some indication of the risks of investing in the Treasury Plus Fund by illustrating the variability of the Fund's returns for Cabrera Capital Markets Class shares from year-to-year. The bar chart shows how the Cabrera Capital Markets Class shares' returns have varied for each full calendar year shown. For periods prior to October 19, 2021, the inception date for Cabrera Capital Markets Class shares, the performance information shown is that of the Premier Class shares of the Fund, which are not offered in this Prospectus, adjusted to reflect the higher class-related operating fees and expenses of Cabrera Capital Markets Class shares. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (877) 521-4083 or by visiting our website at www.ssga.com.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	1.33%	Q4 2023
Lowest Quarterly Return	0.01%	Q1 2022

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Ten Years	Inception Date
Cabrera Capital Markets Class	5.20 %	2.44 %	1.70 %	10/19/2021

To obtain the Fund's current yield, please call (877) 521-4083.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Cabrera Capital Markets Class
To establish an account	$25,000,000
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

To open an account with the Fund, contact Cabrera Capital Markets LLC by telephone (312-236-8888) or by e-mail at mminfo@cabreracapital.com.

You may purchase or redeem Fund Shares by written request or wire transfer. Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Telephone:

By Intermediary:

Financial Intermediaries may contact SS&C GIDS, Inc. at (877) 332-6207 or via email at nsccresearch@dstsystems.com with questions.

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

State Street Institutional U.S. Government Money Market Fund

Investment Objective

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Management Fee	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%
Other Expenses	0.09%
Total Annual Fund Operating Expenses	0.14%

Example:

1 year	3 years	5 years	10 years
$14	$45	$79	$179

Principal Investment Strategies

The Fund attempts to meet its investment objective by investing in:

•

Repurchase agreements collateralized by U.S. government securities.

Principal Risks

Market Risk: The Fund's investments are subject to changes in general economic conditions, general market fluctuations and the risks inherent in investment in securities markets. Investment markets can be volatile and prices of investments can change substantially due to various factors, including, but not limited to, economic growth or recession, changes in interest rates, inflation, changes in the actual or perceived creditworthiness of issuers, and general market liquidity. The Fund is subject to the risk that geopolitical events will disrupt securities markets and adversely affect global economies and markets. Local, regional or global events such as war, military conflicts, acts of terrorism, trade policy changes or disputes, the threat or actual imposition of tariffs, natural disasters, the spread of infectious illness or other public health issues, or other events could have a significant impact on the Fund and its investments.

Performance

The bar chart and table below provide some indication of the risks of investing in the U.S. Government Fund by illustrating the variability of the Fund's returns for Cabrera Capital Markets Class shares from year-to-year. The bar chart shows how the Cabrera Capital Markets Class shares' returns have varied for each full calendar year shown. For periods prior to October 19, 2021, the inception date for Cabrera Capital Markets Class shares, the performance information shown is that of the Premier Class shares of the Fund, which are not offered in this Prospectus, adjusted to reflect the higher class-related operating fees and expenses of Cabrera Capital Markets Class shares. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (877) 521-4083 or by visiting our website at www.ssga.com.

Annual Total Returns (years ended 12/31)

	Returns	Quarter/Year
Highest Quarterly Return	1.33%	Q4 2023
Lowest Quarterly Return	0.01%	Q1 2022

Average Annual Total Returns (for periods ended 12/31/24)

	One Year	Five Years	Ten Years	Inception Date
Cabrera Capital Markets Class	5.20 %	2.44 %	1.71 %	10/19/2021

To obtain the Fund's current yield, please call (877) 521-4083.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Cabrera Capital Markets Class
To establish an account	$25,000,000
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

To open an account with the Fund, contact Cabrera Capital Markets LLC by telephone (312-236-8888) or by e-mail at mminfo@cabreracapital.com.

You may purchase or redeem Fund Shares by written request or wire transfer. Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Telephone:

By Intermediary:

Financial Intermediaries may contact SS&C GIDS, Inc. at (877) 332-6207 or via email at nsccresearch@dstsystems.com with questions.

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

Additional Information About Investment Objectives, Principal Strategies and Risks

Investment Objective

The investment objective of each of the Treasury Fund, Treasury Plus Fund and U.S. Government Fund, as stated in each Fund's Summary, may be changed without shareholder approval.

Treasury Fund

Principal Investment Strategies

The Treasury Fund is a government money market fund and attempts to meet its investment objective by investing only in U.S. Treasury bills, notes and bonds (which are direct obligations of the U.S. government). The Fund will provide shareholders with at least sixty (60) days' prior notice of any change in this investment policy. The Fund may hold a portion of its assets in cash pending investment, to satisfy redemption requests or to meet the Fund's other cash management needs.

Treasury Plus Fund

Principal Investment Strategies

The Treasury Plus Fund is a government money market fund and attempts to meet its investment objective by investing only in U.S. Treasury bills, notes and bonds (which are direct obligations of the U.S. government) and repurchase agreements collateralized by these obligations. The Fund will provide shareholders with at least sixty (60) days' prior notice of any change in this investment policy. The Fund may hold a portion of its assets in cash pending investment, to satisfy redemption requests or to meet the Fund's other cash management needs.

U.S. Government Fund

Principal Investment Strategies

The U.S. Government Fund is a government money market fund and invests only in obligations issued or guaranteed as to principal and/or interest, as applicable, by the U.S. government or its agencies and instrumentalities, as well as repurchase agreements secured by such instruments. The Fund will provide shareholders with at least sixty (60) days' prior notice of any change in this investment policy. The Fund may hold a portion of its assets in cash pending investment, to satisfy redemption requests or to meet the Fund's other cash management needs.

The Fund follows a disciplined investment process that attempts to provide stability of principal, liquidity and current income, by investing in U.S. government securities. Among other things, SSGA FM conducts its own credit analyses of potential investments and portfolio holdings, and relies substantially on a dedicated short-term credit research team. The Fund invests in accordance with regulatory requirements applicable to money market funds. Regulations require, among other things, a money market fund to invest only in short-term, high quality debt obligations (generally, securities that have remaining maturities of 397 calendar days or less, with the exception of certain floating rate securities that may have final maturities longer than 397 days but use maturity shortening provisions to meet the 397 day requirement, and that the Fund believes present minimal credit risk), to maintain a maximum dollar-weighted average maturity and dollar-weighted average life of sixty (60) days or less and 120 days or less, respectively, and to meet requirements as to portfolio diversification and liquidity. All securities held by the Fund are U.S. dollar-denominated, and they may have fixed, variable or floating interest rates.

The Fund attempts to meet its investment objective by investing in:

•

Repurchase agreements collateralized by U.S. government securities.

Additional Information About Risks

Counterparty Risk (principal risk for the Treasury Plus Fund and U.S. Government Fund). A Fund will be subject to credit risk with respect to the counterparties with which a Fund enters into repurchase agreements and other transactions. If a counterparty fails to meet its contractual obligations, a Fund may be unable to terminate the transaction, and it may be delayed or prevented from realizing on any collateral in the event of a bankruptcy or insolvency proceeding relating to the counterparty.

Credit Risk (principal risk for the Treasury Plus Fund and U.S. Government Fund). Credit risk is the risk that an issuer, guarantor or liquidity provider of a fixed-income security held by a Fund may be unable or unwilling, or may be perceived (whether by market participants, ratings agencies, pricing services or otherwise) as unable or unwilling, to make timely principal and/or interest payments, or to otherwise honor its obligations. It includes the risk that the security will be downgraded by a credit rating agency; generally, lower credit quality issuers present higher credit risks. An actual or perceived

Market Disruption and Geopolitical Risk. A Fund is subject to the risk that geopolitical events will disrupt securities markets and adversely affect global economies and markets. War, terrorism, and related geopolitical events have led, and in the future may lead, to increased short-term market volatility and may have adverse long-term effects on U.S. and world economies and markets generally. Likewise, trade policy changes or disputes, natural and environmental disasters, pandemics and epidemics, and systemic market dislocations may be highly disruptive to economies and markets. Those events, as well as other changes in foreign and domestic economic and political conditions, also could adversely affect individual issuers or related groups of issuers, securities markets, interest rates, credit ratings, inflation, investor sentiment, and other factors affecting the value of a Fund's investments. Given the increasing interdependence among global economies and markets, conditions in one country, market, or region might adversely affect markets, issuers, and/or foreign exchange rates in other countries, including the U.S. Any partial or complete dissolution of the Economic and Monetary Union of the European Union, or any increased uncertainty as to its status, could have significant adverse effects on currency and financial markets, and on the values of a Fund's investments. On January 31, 2020, the United Kingdom (“UK”) formally withdrew from the European Union (“EU”) (commonly known as “Brexit”). An agreement between the UK and the EU governing their future trade relationship became effective January 1, 2021, but that agreement does not include an agreement on financial services, and it is unlikely that such agreement will be concluded. Moreover, the UK government has started a program of financial services law reform with the ultimate aim of repealing many EU financial services laws that were assimilated into UK law from January 1, 2021, and replacing them with legislation or rules made by the UK government or financial services regulators. Accordingly, uncertainty remains in certain areas as to the future relationship between the UK and the EU. Brexit has already had a significant impact on the UK, Europe, and global economies, and could continue to result in volatility and illiquidity, legal, political, economic and regulatory uncertainties

Repurchase Agreement Risk (principal risk for the Treasury Plus Fund and U.S. Government Fund). A repurchase agreement is an agreement to buy a security from a seller at one price and a simultaneous agreement to sell it back to the original seller at an agreed-upon price, typically representing the purchase price plus interest. Repurchase agreements may be viewed as loans made by a Fund, which are collateralized by the securities subject to repurchase. A Fund's investment return on such transactions will depend on the counterparty's willingness and ability to perform its obligations under a repurchase agreement. If a Fund's counterparty should default on its obligations and a Fund is delayed or prevented from recovering the collateral, or if the value of the collateral is insufficient, a Fund may realize a loss.

they may create certain systemic risks if sound debt management practices are not implemented. A high national debt level may increase market pressures to meet government funding needs, which may drive debt cost higher and cause a country to sell additional debt, thereby increasing refinancing risk. A high national debt also raises concerns that a government will not be able to make principal or interest payments when they are due. In the worst case, unsustainable debt levels can cause a decline in the value of the dollar (which may lead to inflation), and can prevent the U.S. government from implementing effective countercyclical fiscal policy in economic downturns. On August 5, 2011, Standard & Poor's Ratings Services downgraded U.S. Treasury securities from AAA rating to AA+ rating. Standard & Poor's Ratings Services stated that its decision was prompted by its view on the rising public debt burden and its perception of greater policymaking uncertainty. Fitch also downgraded its rating of U.S. Treasury securities from AAA to AA+ in August 2023 citing increasing government debt and erosion in confidence regarding governance of fiscal matters as a result of repeated political standoffs related to debt limit approvals. A downgrade of the ratings of U.S. government debt obligations, which are often used as a benchmark for other borrowing arrangements, could result in higher interest rates for individual and corporate borrowers, cause disruptions in the international bond markets and have a substantial negative effect on the U.S. economy. Any additional downgrades of U.S. Treasury securities from ratings agencies may cause the value of a Fund's U.S. Treasury obligations to decline. In recent years, impasses in Congress regarding the federal budget have caused temporary Federal government shutdowns. While Congress has temporarily suspended the debt limit from time to time, the risks that the U.S. government will not adopt a long-term budget or deficit reduction plan, of one or more additional Federal government shutdowns or of future failures to not increase the Federal government's debt limit, may affect investor and consumer confidence and may adversely impact financial markets and the broader economy, perhaps suddenly and to a significant degree.

Variable and Floating Rate Securities Risk. Variable or floating rate securities are debt securities with variable or floating interest rates payments. Variable or floating rate securities bear rates of interest that are adjusted periodically according to formulae intended generally to reflect market rates of interest and allow a Fund to participate (determined in accordance with the terms of the securities) in increases in interest rates through upward adjustments of the coupon rates on the securities. However, during periods of increasing interest rates, changes in the coupon rates may lag behind the changes in market rates or may have limits on the maximum increases in coupon rates. Alternatively, during periods of declining interest rates, the coupon rates on such securities will typically readjust downward resulting in a lower yield. A Fund may also invest in variable or floating rate equity securities, whose dividend payments vary based on changes in market rates of interest or other factors.

Additional Information About Non-Principal Investment Strategies and Risks

restrict the Adviser from purchasing securities or selling securities for itself or its clients (including the Funds) or otherwise using such information for the benefit of its clients or itself.

Cybersecurity Risk. With the increased use of technologies such as the Internet and the dependence on computer systems to perform business and operational functions, funds (such as the Funds) and their service providers (including the Adviser) may be prone to operational and information security risks resulting from cyber-attacks and/or technological malfunctions. Furthermore, geopolitical tensions may have increased the scale and sophistication of deliberate cybersecurity attacks, particularly those from nation-states or from entities with nation-state backing. In general, cyber-attacks are deliberate, but unintentional events may have similar effects. Cyber-attacks include, among others, stealing or corrupting data maintained online or digitally, preventing legitimate users from accessing information or services on a website, releasing confidential information without authorization, and causing operational disruption. Successful cyber-attacks against, or security breakdowns of, a Fund, a Portfolio, the Adviser or a custodian, transfer agent, or other affiliated or third-party service provider may adversely affect a Fund or its shareholders. For instance, cyber-attacks or technical malfunctions may interfere with the processing of shareholder or other transactions, affect a Fund's ability to calculate its NAV, cause the release of private shareholder information or confidential Fund information, impede trading, cause reputational damage, and subject a Fund to regulatory fines, penalties or financial losses, reimbursement or other compensation costs, and additional compliance costs. Cyber-attacks or technical malfunctions may render records of Fund assets and transactions, shareholder ownership of Fund Shares, and other data integral to the functioning of a Fund inaccessible or inaccurate or incomplete. A Fund may also incur substantial costs for cybersecurity risk management in order to prevent cyber incidents in the future. A Fund and its shareholders could be negatively impacted as a result. While the Adviser has established business continuity plans and systems designed to minimize the risk of cyber-attacks through the use of technology, processes and controls, there are inherent limitations in such plans and systems, including the possibility that certain risks have not been identified, given the evolving nature of this threat. The use of artificial intelligence (“AI”) and machine learning could exacerbate these risks or result in cyber security incidents that implicate personal data. Each Fund relies on third-party service providers for many of its day-to-day operations, and will be subject to the risk that the protections and protocols implemented by those service providers will be ineffective to protect the Fund from cyber-attack. The Adviser does not control the cybersecurity plans and systems put in place by third-party service providers, and such third-party service providers may have limited indemnification obligations to the Adviser or the Funds. Similar types of cybersecurity risks or technical malfunctions also are present for issuers of securities in which each Fund invests, which could result in material adverse consequences for such issuers, and may cause a Fund's investment in such securities to lose value.

Portfolio Holdings Disclosure

The Funds' portfolio holdings disclosure policy is described in the Statement of Additional Information (“SAI”).

Management and Organization

Investment Adviser

Each Fund has entered into an investment advisory agreement with the Adviser pursuant to which the Adviser will manage the Fund's assets directly, for compensation paid at an annual rate of 0.05% of the Fund's average daily net assets, in the event that the Fund were to cease investing substantially all of its assets in its corresponding Portfolio or another investment company with essentially the same investment objectives and policies as the Fund. The Adviser does not receive any management fees from a Fund under that agreement so long as the Fund continues to invest substantially all of its assets in the corresponding Portfolio or in another investment company with essentially the same investment objectives and policies as the Fund. The Adviser places all orders for purchases and sales of the Portfolios' investments. For the year ended December 31, 2024, the effective management fee paid, reflecting certain fee waivers and expense reimbursements of the Adviser, was 0.05% for Treasury Portfolio, 0.05% for Treasury Plus Portfolio and 0.05% for U.S. Government Portfolio.

Reduction for some Funds, or some share classes of a Fund, and not others. The amount of any Voluntary Reduction may differ between Funds and share classes in the Adviser's sole discretion. The business objectives of the Adviser and its affiliates and their broader relationships with certain Fund shareholders, Financial Intermediaries or distribution channels could give the Adviser an incentive to implement the Voluntary Reduction for some Funds or share classes and not others, or to implement it to a greater degree for some Funds or share classes than others. Under an agreement with the Service Providers relating to the Voluntary Reduction, the Funds and the Portfolios have agreed to reimburse the Service Providers for the full dollar amount of any Voluntary Reduction beginning on May 1, 2020, subject to certain limitations. Each Service Provider may, in its sole discretion, irrevocably waive receipt of any or all reimbursement amounts due from a Fund.

A reimbursement to the Service Provider would increase fund expenses and may negatively impact a Fund's yield during such period. There is no guarantee that the Voluntary Reduction will be in effect at any given time or that a Fund will be able to avoid a negative yield. The Funds have agreed, subject to certain limitations, to reimburse the applicable Service Provider for the full dollar amount of any Voluntary Reduction incurred after May 1, 2020. A Fund is not obligated to reimburse a Service Provider: (1) more than three years after the end of the fiscal year of the Fund in which the Service Provider provided a Voluntary Reduction; (2) in respect of any business day for which the net annualized one-day yield of the Fund or applicable Class is less than 0.00%; (3) to the extent that the amount of the reimbursement to all Service Providers on any day exceeds fifty percent of the yield (net of all expenses, exclusive of the reimbursement) of the Fund or the applicable class on that day; (4) to the extent that the amount of such reimbursement would cause the Fund's or applicable class's net yield to fall below the Fund's or applicable class's minimum yield; (5) in respect of any such fee waivers and/or expense reimbursements that are necessary to maintain the Fund's Contractual Total Expense Limit (as defined in the Reimbursement Agreement), which is effective at the time of such fee waivers and/or expense reimbursements; or (6) in any manner that would result in a class bearing the cost of a reimbursement to the Service Provider for any class-specific expense (including, without limitation, fees payable in accordance with a plan authorized pursuant to Rule 12b-1 under the 1940 Act, or Shareholder Servicing Agreement or similar arrangement) that was waived or reimbursed to the Fund with respect to a different Class.

Any such future reimbursement of an applicable Service Provider may result in the total annual operating expenses with respect to a share class of a Fund exceeding the amount of the expense cap under the contractual expense limitation agreement because the expense is not covered by the agreement.

A discussion regarding the Board's consideration of the Funds' Investment Advisory Agreement is provided in the Funds' Form N-CSR filing with the SEC for the period ended June 30, 2024.

The Administrator, Sub-Administrator and Custodian

The Adviser serves as administrator of each Fund. The amount of the fee paid to the Adviser for administrative services may vary by share class. Each Fund currently pays the Adviser an administrative fee at the annual rate of 0.05% in respect of the class of shares in this Prospectus. State Street Bank and Trust Company (“State Street”), a subsidiary of State Street Corporation, serves as the sub-administrator for the Funds for a fee that is paid by the Adviser. State Street also serves as custodian of the Funds for a separate fee that is paid by the Funds. SSGA FM serves as administrator of the Portfolios and State Street serves as sub-administrator and custodian of the Portfolios.

The Transfer Agent and Dividend Disbursing Agent

SS&C GIDS, Inc. is the Funds' transfer agent and dividend disbursing agent (the “Transfer Agent”).

The Distributor

State Street Global Advisors Funds Distributors, LLC serves as the Funds' distributor (“SSGA FD”) pursuant to the Distribution Agreement between SSGA FD and the Trust.

The Shareholder Servicing Agent

Additional Information

Shareholder Information

Determination of Net Asset Value

Investing in State Street Institutional Investment Trust Shares

Purchasing Shares

The Funds offer one class of shares through this Prospectus: Cabrera Capital Markets Class is available to you subject to the eligibility requirements set forth below. Cabrera Capital Markets Class shares may be purchased through certain Financial Intermediaries or, if you are a client of Cabrera Capital Markets, LLC or its affiliates, through accounts maintained with Cabrera Capital Markets, LLC or its affiliates. Cabrera Capital Markets, LLC or your Financial Intermediary may impose policies, limitations and fees, which are different than those described herein. All classes of a Fund share the same investment objective and investments, but the different share classes have different expense structures and eligibility requirements. You should choose the class with the expense structure that best meets your needs for which you are eligible. In choosing a share class, you should consider the amount you plan to invest. Your investment professional can help you choose the share class that best suits your investment needs.

The chart below summarizes the features of the share class. This chart is only a general summary, and you should read the description of each Fund's expenses in each Fund Summary in this Prospectus.

Any applicable minimum purchase amount may be waived for specific investors or types of investors, including, without limitation, retirement plans, employees of State Street Corporation and its affiliates and their family. In the case of shareholders purchasing shares through a Financial Intermediary, the minimum purchase amount may be applied at the level of the Financial Intermediary.

	Cabrera Capital Markets Class
Minimum Initial Investment	$25,000,000
Maximum Investment	None.
Initial Sales Charge	None. Entire purchase price is invested in shares of a Fund.
Deferred (CDSC) Sales Charge	None.
Distribution and/or Service (12b-1) Fees	None.

Investors pay no sales load to invest in the shares of the Funds. The price for Fund Shares is the NAV per share.

The minimum initial investment in Cabrera Capital Markets Class shares of the Funds is $25 million, although the Adviser may waive the minimum in its discretion. Holdings of related customer accounts may be aggregated for purposes of determining the minimum investment amount. “Related customer accounts” may include but are not limited to accounts

held by the same investment or retirement plan, financial institution, broker, dealer or intermediary. The Funds and the Adviser reserve the right to increase or decrease the minimum amount required to open or maintain an account. There is no minimum subsequent investment, except in relation to maintaining certain minimum account balances (See “Redeeming Shares” below). The Funds require prior notification of subsequent investments in excess of $10 million for the Treasury Fund and $50 million for the Treasury Plus Fund and U.S. Government Fund.

How to Purchase Shares

By Mail:

An initial investment in the Funds must be preceded or accompanied by a completed, signed Institutional Account

Application Form, sent to:

State Street Funds

P.O. Box 219737

Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds

801 Pennsylvania Avenue, Suite 219737

Kansas City, MO 64105-1307

By Telephone/Fax:

An initial investment in the Funds must be preceded or accompanied by a completed, signed Institutional Account

Application Form, faxed to (816) 218-0400. Call the Fund at (866) 392-0869 between the hours of 8:00 a.m. ET

and 6:00 p.m. ET to:

➢ confirm receipt of the faxed Institutional Account Application Form (initial purchases only),

➢ request your new account number (initial purchases only),

➢ confirm the amount being wired and wiring bank, and

➢ receive a confirmation number for your purchase order (your trade is not effective until you have received a

confirmation number from the Fund).

For your initial investment, send the original, signed Institutional Account Application Form to the address above.

Wire Instructions:

Instruct your bank to transfer money by Federal Funds wire to:

State Street Bank and Trust Company

1 Iron Street

Boston, MA 02210

ABA# 011000028

DDA# 9904-631-0

State Street Institutional Investment Trust

Fund Name

Class Name

Account Number

Account Registration

On Columbus Day and Veterans Day, you will not be able to purchase shares by wiring Federal Funds because the

Federal Funds wiring does not occur on those days. Payment for Fund Shares must be in Federal Funds (or

converted to Federal Funds by the Transfer Agent) by the close of the Federal Reserve.

The Funds and the Funds' agents are not responsible for transfer errors by the sending or receiving bank and will

not be liable for any loss incurred due to a wire transfer not having been received.

Redeeming Shares

An investor may redeem all or any portion of its investment. Redemption orders are processed at the NAV next determined after a Fund receives a redemption order in good form.

If redemption proceeds are sent by check, the Fund pays out redemption proceeds on the next Business Day. If a full redemption order is requested, no dividends will accrue with respect to shares on the day the redemption proceeds are sent. If a redemption order is placed after 2:30 p.m. ET for the Treasury Fund and 5:00 p.m. ET for the U.S. Government Fund and the Treasury Plus Fund, the Fund typically expects to pay out redemption proceeds on the next Business Day (and dividends will accrue up to, but not including, the day that redemption proceeds are sent), but no later than the following Business Day. The Fund may postpone and/or suspend redemption and payment beyond the foregoing time periods only as follows:

For any period during which there is a non-routine closure of the Fedwire or applicable Federal Reserve Banks;

For any period (1) during which the NYSE is closed other than customary week-end and holiday closings or (2) during which trading on the NYSE is restricted;

For any period during which the SEC has, by rule or regulation, deemed that (1) trading shall be restricted or (2) an emergency exists;

For any period that the SEC, may by order permit for your protection; or

A Fund may pay all or a portion of your redemption proceeds by giving you securities (for example, if the Fund reasonably believes that a cash redemption may have a substantial impact on the Fund and its remaining shareholders). A redemption is generally a taxable event for shareholders, regardless of whether the redemption is satisfied in cash or in kind. You may pay transaction costs and/or taxes to dispose of the securities, and you may receive less for them than the price at which they were valued for purposes of the redemption. In addition, you will be subject to the market risks associated with such securities until such time as you choose to dispose of the security.

How to Redeem Shares


By Mail:	Send a signed letter to: State Street Institutional Investment Trust Funds P.O. Box 219737 Kansas City, MO 64121-9737
	The letter should include information necessary to process your request as described below. The Fund may require a medallion guarantee in certain circumstances. See “Medallion Guarantees” below.
By Overnight:	State Street Institutional Investment Trust Funds 801 Pennsylvania Avenue, Suite 219737 Kansas City, MO 64105-1307
By Telephone:	Please call (866) 392-0869 between the hours of 8:00 a.m. and 6:00 p.m. ET.
The Funds will need the following information to process your redemption request:
➢ name(s) of account owners; ➢ account number(s); ➢ the name of the Fund; ➢ your daytime telephone number; and ➢ the dollar amount or number of shares being redeemed.

On any day that the Funds calculate their NAVs earlier than normal, the Funds reserve the right to adjust the times noted above for purchasing and redeeming shares.

Medallion Guarantees. Certain redemption requests must include a medallion guarantee for each registered account owner if any of the following apply:

•

Your account address has changed within the last 10 Business Days.

•

Redemption proceeds are being transferred to an account with a different registration.

•

A wire is being sent to a financial institution other than the one that has been established on your Fund account.

•

Other unusual situations as determined by the Transfer Agent.

promptly notifying the Funds of any errors or inaccuracies, including, without limitation, any errors or inaccuracies relating to shareholder data or information transmitted by telephone. During periods of heavy market activity or other times, it may be difficult to reach the Funds by telephone. If you are unable to reach us by telephone, consider sending written instructions.

The Funds may terminate the receipt of redemption orders by telephone at any time, in which case you may redeem shares by other means.

If you choose to purchase or redeem shares by sending instructions by regular mail, they will not be deemed received in good order until they are released by the post office and redelivered to the Transfer Agent's physical location at 801 Pennsylvania Avenue, Suite 219737 in Kansas City, MO 64105-1307. There will be a time lag, which may be one or more days, between regular mail receipt at the post office box and redelivery to such physical location in Kansas City, and a Fund's NAV may change over those days. You might consider using express rather than regular mail if you believe the time of receipt of your transaction request to be sensitive.

Exchanging Shares

An exchange occurs when you use the proceeds from the redemption of shares of a Fund in the State Street Institutional Investment Trust to simultaneously purchase shares of a different Fund in the State Street Institutional Investment Trust. Currently, exchanging shares is allowed from/to the Treasury Plus Fund, U.S. Government Fund, and Treasury Fund. Exchanges may be made between different Funds within the same class (i.e., Cabrera Capital Markets Class shares for Cabrera Capital Markets Class shares). The account holding the original shares must be registered in the same name as the account holding the new shares received in the exchange. You may make exchange requests by telephone, or by mail. See Purchasing Shares and Redeeming Shares. Exchanges are subject to the terms applicable to the purchases of the fund into which you are exchanging. Exchange privileges may not be available for mutual funds advised by SSGA FM (the “State Street Funds”) and may be suspended or rejected.

Excessive Trading

Delivery of Documents to Accounts Sharing an Address

To reduce expenses, we may mail only one copy of the Funds' Prospectus and each annual and semi-annual report to those addresses shared by two or more accounts. If you wish to receive individual copies of these documents, please call us at (866) 392-0869, or contact your financial institution. We will begin sending you individual copies thirty (30) days after receiving your request.

Unclaimed Property

Many states have unclaimed property rules that provide for transfer to the state (also known as “escheatment”) of unclaimed property under various circumstances. These circumstances include inactivity (e.g., no owner-initiated contact for a certain period), returned mail (e.g., when mail sent to a shareholder is returned by the post office as undeliverable), or a combination of both inactivity and returned mail. If a State Street Fund identifies property as unclaimed, it will attempt to contact the shareholder, but if that attempt is unsuccessful, the account may be considered abandoned and escheated to the state after the passage of a certain period of time (as required by applicable state law).

If you are a resident of the state of Texas, you may designate a representative to receive escheatment notifications by completing and submitting a designation form, which you can find on the website of the Texas Comptroller. Designating such a representative may be beneficial, since Texas law provides that the escheatment period will cease if the representative, after receiving an escheatment notification regarding your account, communicates knowledge of your location and confirms that you have not abandoned your account. You can mail a completed designation form to the Fund (if you hold shares directly with the Fund) or to your financial intermediary (if you do not hold shares directly with the Fund).

Dividends, Distributions and Tax Considerations

as either short-term or long-term capital gain, depending upon how long you held the Fund Shares. The Internal Revenue Service (the “IRS”) has issued final regulations and published guidance that permit a simplified method of accounting for gains and losses realized upon the disposition of money market fund shares. Shareholders should see the SAI for further information.

An additional 3.8% Medicare contribution tax is imposed on the “net investment income” of individuals, estates and trusts to the extent their income exceeds certain threshold amounts. Net investment income generally includes for this purpose dividends paid by a Fund and net gains recognized on the redemption (or other taxable disposition) of Fund Shares.

Financial Intermediary Arrangements

Payments to Financial Intermediaries

pensation may be made available only to certain Financial Intermediaries whose representatives have sold or are expected to sell significant amounts of shares. Dealers may not use sales of the Funds' shares to qualify for this compensation to the extent prohibited by the laws or rules of any state or any self-regulatory agency, such as FINRA.

Third-Party Transactions. The State Street Funds have authorized certain Financial Intermediaries to accept purchase, redemption and exchange orders on the State Street Funds' behalf. Orders received for a State Street Fund by a Financial Intermediary that has been authorized to accept orders on the Fund's behalf (or other Financial Intermediaries designated by the Financial Intermediary) will be deemed accepted by the Fund at the time they are received by the Financial Intermediary and will be priced based on the Fund's next NAV determination as long as the Financial Intermediary transmits the order in good form and in a timely manner to the applicable State Street Fund(s). The Financial Intermediary is responsible for transmitting your orders and associated funds in good form and in a timely manner to the applicable State Street Fund(s). The State Street Funds will not be responsible for delays by the Financial Intermediary in transmitting your orders, including timely transfer of payment, to a Fund.

Financial Highlights

The financial highlight tables are intended to help you understand each Fund's financial performance for the past five fiscal years or, if shorter, the period since each class' inception. Certain information reflects the performance results for a single Fund Share. The total returns in the tables represent the rate that an investor would have earned (or lost) on an investment in each Fund (assuming reinvestment of all dividends and distributions). This information has been audited by Ernst & Young LLP, the Trust's independent registered public accounting firm, whose report, along with each Fund's financial highlights and financial statements, is included in each Fund's Form N-CSR filing, which is available upon request. Any references to Notes in these financial highlight tables refer to the “Notes to Financial Statements” section of each Fund's financial statements, and the financial information included in these tables should be read in conjunction with the financial statements incorporated by reference in the SAI.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL TREASURY MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Cabrera Capital Markets Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	For the Period 10/20/21*- 12/31/21
Net asset value, beginning of period	$1.0000	$1.0000	$1.0000	$1.0000
Income (loss) from investment operations:
Net investment income (loss)	0.0506	0.0486	0.0145	0.0001
Net realized gain (loss)	0.0000 (b)	0.0000 (b)	(0.0003 )	0.0001
Total from investment operations	0.0506	0.0486	0.0142	0.0002
Distributions to shareholders from:
Net investment income	(0.0506 )	(0.0486 )	(0.0142 )	(0.0001 )
Net realized gains	—	—	—	(0.0001 )
Total distributions	(0.0506 )	(0.0486 )	(0.0142 )	(0.0002 )
Net asset value, end of period	$1.0000	$1.0000	$1.0000	$1.0000
Total return (c)	5.18 %	4.97 %	1.43 %	0.00 %(d)
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$16,057	$5,083	$51	$50
Ratios to Average Net Assets:
Total expenses	0.14 %	0.14 %	0.14 %	0.15 %(e)
Net expenses	0.14 %	0.14 %	0.13 %	0.05 %(e)
Net investment income (loss)	4.80 %	5.24 %	1.45 %	0.02 %(e)

*	Commencement of operations.
(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(d)	Amount is less than 0.005%.
(e)	Annualized.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL TREASURY PLUS MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Cabrera Capital Markets Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	For the Period 10/20/21*- 12/31/21
Net asset value, beginning of period	$1.0000	$1.0000	$1.0000	$1.0000
Income (loss) from investment operations:
Net investment income (loss)	0.0508	0.0492	0.0158	0.0001
Net realized gain (loss)	(0.0000 )(b)	0.0000 (b)	—	0.0000 (b)
Total from investment operations	0.0508	0.0492	0.0158	0.0001
Distributions to shareholders from:
Net investment income	(0.0508 )	(0.0492 )	(0.0158 )	(0.0001 )
Net asset value, end of period	$1.0000	$1.0000	$1.0000	$1.0000
Total return (c)	5.20 %	5.03 %	1.59 %	0.00 %(d)
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$102,125	$56,798	$51	$50
Ratios to Average Net Assets:
Total expenses	0.14 %	0.14 %	0.14 %	0.13 %(e)
Net expenses	0.14 %	0.14 %	0.13 %	0.04 %(e)
Net investment income (loss)	5.07 %	5.15 %	1.60 %	0.02 %(e)

*	Commencement of operations.
(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of the affiliated Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(d)	Amount is less than 0.005%.
(e)	Annualized.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET INSTITUTIONAL U.S. GOVERNMENT MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Cabrera Capital Markets Class (a)
	Year Ended 12/31/24	Year Ended 12/31/23	Year Ended 12/31/22	For the Period 10/20/21*- 12/31/21
Net asset value, beginning of period	$1.0000	$1.0000	$1.0000	$1.0000
Income (loss) from investment operations:
Net investment income (loss)	0.0508	0.0492	0.0157	0.0001
Net realized gain (loss)	(0.0000 )(b)	0.0000 (b)	0.0000 (b)	0.0000 (b)
Total from investment operations	0.0508	0.0492	0.0157	0.0001
Distributions to shareholders from:
Net investment income	(0.0508 )	(0.0492 )	(0.0157 )	(0.0001 )
Net asset value, end of period	$1.0000	$1.0000	$1.0000	$1.0000
Total return (c)	5.20 %	5.03 %	1.58 %	0.01 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$1,814	$472,047	$175,359	$100
Ratios to Average Net Assets:
Total expenses	0.14 %	0.15 %	0.18 %	0.14 %(d)
Net expenses	0.14 %	0.15 %	0.17 %	0.04 %(d)
Net investment income (loss)	5.18 %	5.24 %	4.32 %	0.02 %(d)

*	Commencement of operations.
(a)	The per share amounts and percentages include the Fund's proportionate share of income and expenses of their respective Portfolio.
(b)	Amount is less than $0.00005 per share.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(d)	Annualized.

Contacting the State Street Funds

Online:	www.ssga.com	24 hours a day, 7 days a week
Phone:	(877) 521-4083	Monday – Friday 8:00 am – 6:00 pm EST

Written requests should be sent to:

Regular mail	Overnight/Registered, Express, Certified Mail
State Street Funds P.O. Box 219737 Kansas City, MO 64121-9737	State Street Funds 801 Pennsylvania Avenue, Suite 219737 Kansas City, MO 64105-1307

Regular mail / Overnight Registered, Express, Certified Mail

Cabrera Capital Markets

10 S LaSalle Street Suite 1050

Chicago, IL, 60603

For more information about the Funds:

The Funds' SAI includes additional information about the Funds and is incorporated by reference into this document. Additional information about the Funds' investments is available in the Funds' most recent annual and semi-annual reports to shareholders and in each Fund's Form N-CSR filing. In a Fund's Form N-CSR, you will find the Fund's annual and semi-annual financial statements. The Funds' SAI is available, without charge, upon request. The Funds' annual and semi-annual reports are available, without charge, upon request. Shareholders in the Funds may make inquiries to the Funds to receive such information by calling (877) 521-4083 or the customer service center at the telephone number shown in the accompanying contract prospectus, if applicable. Each Fund's Prospectus, SAI, annual and semi-annual reports to shareholders and other information such as each Fund's financial statements are available, free of charge, on the Funds' website at www.ssga.com.

SSGA Funds Management, Inc

ONE IRON STREET

BOSTON, MASSACHUSETTS 02210

SSIITCABRERA PROThe State Street Institutional Investment Trust's Investment Company Act File Number is 811-09819.

Prospectus

April 30, 2025

State Street Institutional
Investment Trust

State Street Federal Treasury Money Market Fund

Advantage Class (AFTXX)

State Street Federal Treasury Plus Money Market Fund

Advantage Class (ATPXX)

State Street Federal Government Money Market Fund

Advantage Class (AGFXX)

The U.S. Securities and Exchange Commission has not approved or disapproved these securities or passed upon the adequacy of this Prospectus. Any representation to the contrary is a criminal offense.

An investment in any of the Funds offered by this Prospectus is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

TABLE OF CONTENTS

Fund Summaries	1
State Street Federal Treasury Money Market Fund	1
State Street Federal Treasury Plus Money Market Fund	5
State Street Federal Government Money Market Fund	10
Additional Information About Investment Objectives, Principal Strategies and Risks	15
Additional Information About Non-Principal Investment Strategies and Risks	22
Portfolio Holdings Disclosure	23
Management and Organization	24
Shareholder Information	25
Dividends, Distributions and Tax Considerations	32
Financial Highlights	34

State Street Federal Treasury Money Market Fund

Investment Objective

The investment objective of State Street Federal Treasury Money Market Fund (the “Treasury Fund” or sometimes referred to in context as the “Fund”) is to seek a high level of current income consistent with preserving principal and liquidity and the maintenance of a stable $1.00 per share net asset value (“NAV”).

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Management Fee	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%
Other Expenses
Operations and Administration Fee 1	0.14%
Shareholder Service and Administration Fee1	0.25%
Total Other Expenses	0.39%
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	0.44%

Other Expenses are based on estimates for the current fiscal year.

Example:

1 year	3 years
$45	$141

Principal Investment Strategies

days but use maturity shortening provisions to meet the 397 day requirement, and that the Fund believes present minimal credit risk), to maintain a maximum dollar-weighted average maturity and dollar-weighted average life of sixty (60) days or less and 120 days or less, respectively, and to meet requirements as to portfolio diversification and liquidity.

Principal Risks

Market Risk: The Fund's investments are subject to changes in general economic conditions, general market fluctuations and the risks inherent in investment in securities markets. Investment markets can be volatile and prices of investments can change substantially due to various factors, including, but not limited to, economic growth or recession, changes in interest rates, inflation, changes in the actual or perceived creditworthiness of issuers, and general market liquidity. The Fund is subject to the risk that geopolitical events will disrupt securities markets and adversely affect global economies and markets. Local, regional or global events such as war, military conflicts, acts of terrorism, trade policy changes or disputes, the threat or actual imposition of tariffs, natural disasters, the spread of infectious illness or other public health issues, or other events could have a significant impact on the Fund and its investments.

and increased volatility of the fixed income markets. During periods when interest rates are at low levels, the Fund's yield can be low, and the Fund may have a negative yield (i.e., it may lose money on an operating basis). To the extent that interest rates fall, certain underlying obligations may be paid off substantially faster than originally anticipated. If the principal on a debt obligation is prepaid before expected, the prepayments of principal may have to be reinvested in obligations paying interest at lower rates. During periods of falling interest rates, the income received by the Fund may decline. Changes in interest rates will likely have a greater effect on the values of debt securities of longer durations. Returns on investments in debt securities could trail the returns on other investment options, including investments in equity securities. High levels of inflation and/or a significantly changing interest rate environment can lead to heightened levels of volatility and reduced liquidity.

Fund Performance

The Fund has not yet completed a full calendar year of operations and therefore does not have performance history. Once the Fund has completed a full calendar year of operations, a bar chart and table will be included that will provide some indication of the risks of investing in the Fund by showing the variability of the Fund's returns based on net assets. When available, the Fund will make updated performance information available at the Fund's website: https://www.ssga.com.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Advantage Class
To establish an account	$1,000,000
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

You may purchase or redeem Fund Shares by written request or wire transfer. Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Telephone:

By Intermediary:

Financial Intermediaries may contact SS&C GIDS, Inc. at (877) 332-6207 or via email at nsccresearch@dstsystems.com with questions.

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

State Street Federal Treasury Plus Money Market Fund

Investment Objective

The investment objective of State Street Federal Treasury Plus Money Market Fund (the “Treasury Plus Fund” or sometimes referred to in context as the “Fund”) is to seek a high level of current income consistent with preserving principal and liquidity and the maintenance of a stable $1.00 per share net asset value (“NAV”).

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Management Fee	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%
Other Expenses
Operations and Administration Fee1	0.14%
Shareholder Service and Administration Fee1	0.25%
Total Other Expenses	0.39%
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	0.44%

Other Expenses are based on estimates for the current fiscal year.

Example:

1 year	3 years
$45	$141

Principal Investment Strategies

Principal Risks

Market Risk: The Fund's investments are subject to changes in general economic conditions, general market fluctuations and the risks inherent in investment in securities markets. Investment markets can be volatile and prices of investments can change substantially due to various factors, including, but not limited to, economic growth or recession, changes in interest rates, inflation, changes in the actual or perceived creditworthiness of issuers, and general market liquidity. The Fund is subject to the risk that geopolitical events will disrupt securities markets and adversely affect global economies and markets. Local, regional or global events such as war, military conflicts, acts of terror

Fund Performance

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Advantage Class
To establish an account	$1,000,000
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

You may purchase or redeem Fund Shares by written request or wire transfer. Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Telephone:

By Intermediary:

Financial Intermediaries may contact SS&C GIDS, Inc. at (877) 332-6207 or via email at nsccresearch@dstsystems.com with questions.

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

State Street Federal Government Money Market Fund

Investment Objective

The investment objective of the State Street Federal Government Money Market Fund (the “Government Fund” or sometimes referred to in context as the “Fund”) is to seek to maximize current income, to the extent consistent with the preservation of capital and liquidity and the maintenance of a stable $1.00 per share net asset value (“NAV”).

Fees and Expenses of the Fund

The tables below describe the fees and expenses that you may pay if you buy, hold, and sell shares of the Government Fund (“Fund Shares”). You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. The expenses shown in the table and the Example reflect the expenses of the Fund and the Fund's proportionate share of the expenses of the State Street U.S. Government Money Market Portfolio (the “U.S. Government Portfolio” or sometimes referred to in context as the “Portfolio”).

Shareholder Fees (fees paid directly from your investment)

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Management Fee	0.05%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%
Other Expenses
Operations and Administration Fee1	0.14%
Shareholder Service and Administration Fee1	0.25%
Total Other Expenses	0.39%
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	0.44%

Other Expenses are based on estimates for the current fiscal year.

Example:

1 year	3 years
$45	$141

Principal Investment Strategies

The Government Fund is a government money market fund and invests only in obligations issued or guaranteed as to principal and/or interest, as applicable, by the U.S. government or its agencies and instrumentalities, as well as repurchase agreements secured by such instruments. The Fund may hold a portion of its assets in cash pending investment, to satisfy redemption requests or to meet the Fund's other cash management needs.

with regulatory requirements applicable to money market funds. Regulations require, among other things, a money market fund to invest only in short-term, high quality debt obligations (generally, securities that have remaining maturities of 397 calendar days or less, with the exception of certain floating rate securities that may have final maturities longer than 397 days but use maturity shortening provisions to meet the 397 day requirement, and that the Fund believes present minimal credit risk), to maintain a maximum dollar-weighted average maturity and dollar-weighted average life of sixty (60) days or less and 120 days or less, respectively, and to meet requirements as to portfolio diversification and liquidity. All securities held by the Fund are U.S. dollar-denominated, and they may have fixed, variable or floating interest rates.

The Fund attempts to meet its investment objective by investing in:

•

Repurchase agreements collateralized by U.S. government securities.

Principal Risks

Market Risk: The Fund's investments are subject to changes in general economic conditions, general market fluctuations and the risks inherent in investment in securities markets. Investment markets can be volatile and prices of investments can change substantially due to various factors, including, but not limited to, economic growth or recession, changes in interest rates, inflation, changes in the actual or perceived creditworthiness of issuers, and general market liquidity. The Fund is subject to the risk that geopolitical events will disrupt securities markets and adversely affect global economies and markets. Local, regional or global events such as war, military conflicts, acts of terrorism, trade policy changes or disputes, the threat or actual imposition of tariffs, natural disasters, the spread of infectious illness or other public health issues, or other events could have a significant impact on the Fund and its investments.

Fund Performance

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Advantage Class
To establish an account	$1,000,000
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

You may purchase or redeem Fund Shares by written request or wire transfer. Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
801 Pennsylvania Avenue, Suite 219737
Kansas City, MO 64105-1307

By Telephone:

By Intermediary:

Financial Intermediaries may contact SS&C GIDS, Inc. at (877) 332-6207 or via email at nsccresearch@dstsystems.com with questions.

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

Additional Information About Investment Objectives, Principal Strategies and Risks

Investment Objective

The investment objective of each of the Treasury Fund, Treasury Plus Fund and Government Fund, as stated in each Fund's Summary, may be changed without shareholder approval.

Treasury Fund

Principal Investment Strategies

The Treasury Fund is a government money market fund and attempts to meet its investment objective by investing only in U.S. Treasury bills, notes and bonds (which are direct obligations of the U.S. government). The Fund will provide shareholders with at least sixty (60) days' prior notice of any change in this investment policy. The Fund may hold a portion of its assets in cash pending investment, to satisfy redemption requests or to meet the Fund's other cash management needs.

Treasury Plus Fund

Principal Investment Strategies

The Treasury Plus Fund is a government money market fund and attempts to meet its investment objective by investing only in U.S. Treasury bills, notes and bonds (which are direct obligations of the U.S. government) and repurchase agreements collateralized by these obligations. The Fund will provide shareholders with at least sixty (60) days' prior notice of any change in this investment policy. The Fund may hold a portion of its assets in cash pending investment, to satisfy redemption requests or to meet the Fund's other cash management needs.

Government Fund

Principal Investment Strategies

The Government Fund is a government money market fund and invests only in obligations issued or guaranteed as to principal and/or interest, as applicable, by the U.S. government or its agencies and instrumentalities, as well as repurchase agreements secured by such instruments. The Fund will provide shareholders with at least sixty (60) days' prior notice of any change in this investment policy. The Fund may hold a portion of its assets in cash pending investment, to satisfy redemption requests or to meet the Fund's other cash management needs.

The Fund follows a disciplined investment process that attempts to provide stability of principal, liquidity and current income, by investing in U.S. government securities. Among other things, SSGA FM conducts its own credit analyses of potential investments and portfolio holdings, and relies substantially on a dedicated short-term credit research team. The Fund invests in accordance with regulatory requirements applicable to money market funds. Regulations require, among other things, a money market fund to invest only in short-term, high quality debt obligations (generally, securities that have remaining maturities of 397 calendar days or less, with the exception of certain floating rate securities that may have final maturities longer than 397 days but use maturity shortening provisions to meet the 397 day requirement, and that the Fund believes present minimal credit risk), to maintain a maximum dollar-weighted average maturity and dollar-weighted average life of sixty (60) days or less and 120 days or less, respectively, and to meet requirements as to portfolio diversification and liquidity. All securities held by the Fund are U.S. dollar-denominated, and they may have fixed, variable or floating interest rates.

The Fund attempts to meet its investment objective by investing in:

•

Repurchase agreements collateralized by U.S. government securities.

Additional Information About Risks

Credit Risk (principal risk for the Government Fund and Treasury Plus Fund). Credit risk is the risk that an issuer, guarantor or liquidity provider of a fixed-income security held by a Fund may be unable or unwilling, or may be perceived (whether by market participants, ratings agencies, pricing services or otherwise) as unable or unwilling, to make timely principal and/or interest payments, or to otherwise honor its obligations. It includes the risk that the security will be downgraded by a credit rating agency; generally, lower credit quality issuers present higher credit risks. An actual or perceived decline in creditworthiness of an issuer of a fixed-income security held by a Fund may result in a decrease in the value of the security. It is possible that the ability of an issuer to meet its obligations will decline substantially during the period when a Fund owns securities of the issuer or that the issuer will default on its obligations or that the obligations of the issuer will be limited or restructured.

Income Risk (principal risk for the Government Fund). A Fund's income may decline due to falling interest rates or other factors. Issuers of securities held by a Fund may call or redeem the securities during periods of falling interest rates, and the Fund would likely be required to reinvest in securities paying lower interest rates. If an obligation held by a Fund is prepaid, the Fund may have to reinvest the prepayment in other obligations paying income at lower rates. A reduction in the income earned by a Fund may limit the Fund's ability to achieve its objective.

Reinvestment Risk (principal risk for the Government Fund). Income from a Fund's portfolio may decline when the Fund invests the proceeds from investment income, sales of portfolio securities or matured, traded or called debt obligations. For instance, during periods of declining interest rates, an issuer of debt obligations may exercise an option to redeem securities prior to maturity, forcing a Fund to reinvest the proceeds in lower-yielding securities. A decline in income received by a Fund from its investments is likely to have a negative effect on the yield and total return of the Fund Shares.

Market Disruption and Geopolitical Risk. A Fund is subject to the risk that geopolitical events will disrupt securities markets and adversely affect global economies and markets. War, terrorism, and related geopolitical events have led, and in the future may lead, to increased short-term market volatility and may have adverse long-term effects on U.S. and world economies and markets generally. Likewise, trade policy changes or disputes, natural and environmental disasters, pandemics and epidemics, and systemic market dislocations may be highly disruptive to economies and markets. Those events, as well as other changes in foreign and domestic economic and political conditions, also could adversely affect individual issuers or related groups of issuers, securities markets, interest rates, credit ratings, inflation, investor sentiment, and other factors affecting the value of a Fund's investments. Given the increasing interdependence among global economies and markets, conditions in one country, market, or region might adversely affect markets, issuers, and/or foreign exchange rates in other countries, including the U.S. Any partial or complete dissolution of the Economic and Monetary Union of the European Union, or any increased uncertainty as to its status, could have significant adverse effects on currency and financial markets, and on the values of a Fund's investments. On January 31, 2020, the United Kingdom (“UK”) formally withdrew from the European Union (“EU”) (commonly known as “Brexit”). An agreement between the UK and the EU governing their future trade relationship became effective January 1, 2021, but that agreement does not include an agreement on financial services, and it is unlikely that such agreement will be concluded. Moreover, the UK government has started a program of financial services law reform with the ultimate aim of repealing many EU financial services laws that were assimilated into UK law from January 1, 2021, and replacing them with legislation or rules made by the UK government or financial services regulators. Accordingly, uncertainty remains in certain areas as to the future relationship between the UK and the EU. Brexit has already had a significant impact on the UK, Europe, and global economies, and could continue to result in volatility and illiquidity, legal, political, economic and regulatory uncertainties and lower economic growth for these economies that could in turn have an adverse effect on the value of the Fund's investments. Any further exits from the EU, or the possibility of such exits, or the abandonment of the euro, may cause additional market disruption globally and introduce new legal and regulatory uncertainties.

to provide or arrange credit supports to financial institutions whose operations have been compromised by credit market dislocations and to restore liquidity and stability to financial systems in their jurisdictions; the implementation of such governmental interventions and their impact on both the markets generally and a Fund's investment program in particular can be uncertain. Governmental and non-governmental issuers may default on, or be forced to restructure, their debts, and other issuers may face difficulties obtaining credit. Defaults or restructurings by governments or others of their debts could have substantial adverse effects on economies, financial markets, and asset valuations around the world. Federal Reserve or other U.S. or non-U.S. governmental or central bank actions, including interest rate increases or contrary actions by different governments, or investor perception that these efforts are not succeeding, could negatively affect financial markets generally as well as the values and liquidity of certain securities.

Large Transactions Risk. To the extent a large proportion of the interests of a Fund or Portfolio are highly concentrated or held by a small number of investors (or a single investor), including funds or accounts over which the Adviser has investment discretion, a Fund is subject to the risk that these investors will purchase or redeem Portfolio or Fund interests in large amounts rapidly or unexpectedly, including as a result of an asset allocation decision made by the Adviser. In addition, a large number of shareholders collectively may purchase or redeem Portfolio or Fund shares in large amounts rapidly or unexpectedly (collectively, such transactions are referred to as “large shareholder transactions”). Large shareholder transactions could adversely affect the ability of a Fund to conduct its investment program. For example, they could require a Portfolio or Fund to sell portfolio securities or purchase portfolio securities unexpectedly and incur substantial transaction costs and/or accelerate the realization of taxable income and/or gains to investors. The effects of taxable income and/or gains resulting from large shareholder transactions would particularly impact non-redeeming shareholders who do not hold their Fund shares in an IRA, 401(k) plan or other tax-advantaged plan. To the extent that such transactions result in short-term capital gains, such gains will generally be taxed at the ordinary income tax rate for shareholders who hold Fund shares in a taxable account. In addition, a Portfolio or a Fund may be required to sell its more liquid portfolio investments to meet a large redemption, in which case a Fund's remaining assets may be less liquid, more volatile, and more difficult to price. A Portfolio or Fund may hold a relatively large proportion of its assets in cash in anticipation of large redemptions, diluting its investment returns. A number of circumstances may cause a Portfolio or a Fund to experience large redemptions, such as changes in investors' circumstances; changes in the eligibility criteria for a Portfolio or a Fund or share class of the Fund; liquidations, reorganizations, repositionings, or other announced Portfolio or Fund events; or changes in investment objectives, strategies, policies, risks, or investment personnel.

however the Treasury Fund, Treasury Plus Fund and Government Fund are all government money market funds that have not elected to be subject to the liquidity fee provision of Rule 2a-7. None of State Street Corporation, State Street, State Street Global Advisors, SSGA FM or their affiliates (collectively, the “State Street Entities”) guarantee the value of an investment in a money market fund at $1.00 per share. Investors should have no expectation of capital support to a money market fund from the State Street Entities.

Mortgage-Related and Other Asset-Backed Securities Risk (principal risk for the Government Fund). Investments in mortgage-related and other asset-backed securities are subject to the risk of significant credit downgrades, illiquidity, and defaults to a greater extent than many other types of fixed income investments. The liquidity of mortgage-related and asset-backed securities may change over time. Mortgage-related securities represent a participation in, or are secured by, mortgage loans. Other asset-backed securities are typically structured like mortgage-related securities, but instead of mortgage loans or interests in mortgage loans, the underlying assets may include, for example, items such as motor vehicle installment sales or installment loan contracts, leases on various types of real and personal property, and receivables from credit card agreements. During periods of falling interest rates, mortgage-related and other asset-backed securities, which typically provide the issuer with the right to prepay the security prior to maturity, may be prepaid, which may result in a Fund having to reinvest the proceeds in other investments at lower interest rates. During periods of rising interest rates, the average life of mortgage-related and other asset-backed securities may extend because of slower-than expected principal payments. This may lock in a below market interest rate, increase the security's duration and interest rate sensitivity, and reduce the value of the security. As a result, mortgage-related and other asset-backed securities may have less potential for capital appreciation during periods of declining interest rates than other debt securities of comparable maturities, although they may have a similar risk of decline in market values during periods of rising interest rates. Prepayment rates are difficult to predict and the potential impact of prepayments on the value of a mortgage-related or other asset-backed security depends on the terms of the instrument and can result in significant volatility. The price of a mortgage-related or other asset-backed security also depends on the credit quality and adequacy of the underlying assets or collateral. Mortgage-related or other asset-backed securities issued by non-governmental issuers (such as commercial banks, savings and loan institutions, private mortgage insurance companies, mortgage bankers and other secondary market issuers) will generally entail greater credit risk than obligations guaranteed by the U.S. government. Defaults on the underlying assets, if any, may impair the value of a mortgage-related or other asset-backed security. For some asset-backed securities in which a Fund invests, such as those backed by credit card receivables, the underlying cash flows may not be supported by a security interest in a related asset. Moreover, the values of mortgage-related and other asset-backed securities may be substantially dependent on the servicing of the underlying asset pools, and are therefore subject to risks associated with the negligence or malfeasance by their servicers and to the credit risk of their servicers. In certain situations, the mishandling of related documentation may also affect the rights of securities holders in and to the underlying collateral. There may be legal and practical limitations on the enforceability of any security interest granted with respect to underlying assets, or the value of the underlying assets, if any, may be insufficient if the issuer defaults.

Repurchase Agreement Risk (principal risk for the Government Fund and Treasury Plus Fund). A repurchase agreement is an agreement to buy a security from a seller at one price and a simultaneous agreement to sell it back to the original seller at an agreed-upon price, typically representing the purchase price plus interest. Repurchase agreements may be viewed as loans made by a Fund, which are collateralized by the securities subject to repurchase. A Fund's investment return on such transactions will depend on the counterparty's willingness and ability to perform its obligations under a repurchase agreement. If a Fund's counterparty should default on its obligations and a Fund is delayed or prevented from recovering the collateral, or if the value of the collateral is insufficient, a Fund may realize a loss.

Counterparty Risk (principal risk for the Government Fund and Treasury Plus Fund). A Fund will be subject to credit risk with respect to the counterparties with which a Fund enters into repurchase agreements and other transactions. If a counterparty fails to meet its contractual obligations, a Fund may be unable to terminate the transaction, and it may be delayed or prevented from realizing on any collateral in the event of a bankruptcy or insolvency proceeding relating to the counterparty.

U.S. Government Securities Risk (principal risk for the Government Fund). U.S. government securities, such as Treasury bills, notes and bonds and mortgage-backed securities guaranteed by the Government National Mortgage Association (“Ginnie Mae”), are supported by the full faith and credit of the United States; others are supported by the right of the issuer to borrow from the U.S. Treasury; others are supported by the discretionary authority of the U.S. government to purchase the agency's obligations; and still others are supported only by the credit of the issuing agency, instrumentality, or enterprise. Although U.S. government-sponsored enterprises such as the Federal Home Loan Mortgage Corporation (“Freddie Mac”) and the Federal National Mortgage Association (“Fannie Mae”) may be chartered or sponsored by Congress, they are not funded by Congressional appropriations, and their securities are not issued by the U.S. Treasury nor supported by the full faith and credit of the U.S. government. There is no assurance that the U.S. government would provide financial support to its agencies and instrumentalities if not required to do so. In addition, certain governmental entities have been subject to regulatory scrutiny regarding their accounting policies and practices and other concerns that may result in legislation, changes in regulatory oversight and/or other consequences that could adversely affect the credit quality, availability, or investment character of securities issued by these entities. The value and liquidity of U.S. government securities may be affected adversely by changes in the ratings of those securities. Securities issued by the U.S. Treasury historically have been considered to present minimal credit risk. The downgrade in the long-term U.S. credit rating by at least two major rating agencies has introduced greater uncertainty about the ability of the U.S. to repay its obligations. Further credit rating downgrades or a U.S. credit default could decrease the value and increase the volatility of a Fund's investments.

Significant Exposure to U.S. Government Agencies or Instrumentalities Risk (principal risk for the Government Fund). To the extent a Fund focuses its investments in securities issued or guaranteed by U.S. government agencies or instrumentalities, any market movements, regulatory changes or changes in political or economic conditions that affect the U.S. government agencies or instrumentalities in which the Fund invests may have a significant impact on a Fund's performance. Events that would adversely affect the market prices of securities issued or guaranteed by one government agency or instrumentality may adversely affect the market price of securities issued or guaranteed by other government agencies or instrumentalities.

Fund's U.S. Treasury obligations to decline. In recent years, impasses in Congress regarding the federal budget have caused temporary Federal government shutdowns. While Congress has temporarily suspended the debt limit from time to time, the risks that the U.S. government will not adopt a long-term budget or deficit reduction plan, of one or more additional Federal government shutdowns or of future failures to not increase the Federal government's debt limit, may affect investor and consumer confidence and may adversely impact financial markets and the broader economy, perhaps suddenly and to a significant degree.

Variable and Floating Rate Securities Risk. Variable or floating rate securities are debt securities with variable or floating interest rates payments. Variable or floating rate securities bear rates of interest that are adjusted periodically according to formulae intended generally to reflect market rates of interest and allow a Fund to participate (determined in accordance with the terms of the securities) in increases in interest rates through upward adjustments of the coupon rates on the securities. However, during periods of increasing interest rates, changes in the coupon rates may lag behind the changes in market rates or may have limits on the maximum increases in coupon rates. Alternatively, during periods of declining interest rates, the coupon rates on such securities will typically readjust downward resulting in a lower yield. A Fund may also invest in variable or floating rate equity securities, whose dividend payments vary based on changes in market rates of interest or other factors.

Additional Information About Non-Principal Investment Strategies and Risks

releasing confidential information without authorization, and causing operational disruption. Successful cyber-attacks against, or security breakdowns of, a Fund, a Portfolio, the Adviser or a custodian, transfer agent, or other affiliated or third-party service provider may adversely affect a Fund or its shareholders. For instance, cyber-attacks or technical malfunctions may interfere with the processing of shareholder or other transactions, affect a Fund's ability to calculate its NAV, cause the release of private shareholder information or confidential Fund information, impede trading, cause reputational damage, and subject a Fund to regulatory fines, penalties or financial losses, reimbursement or other compensation costs, and additional compliance costs. Cyber-attacks or technical malfunctions may render records of Fund assets and transactions, shareholder ownership of Fund Shares, and other data integral to the functioning of a Fund inaccessible or inaccurate or incomplete. A Fund may also incur substantial costs for cybersecurity risk management in order to prevent cyber incidents in the future. A Fund and its shareholders could be negatively impacted as a result. While the Adviser has established business continuity plans and systems designed to minimize the risk of cyber-attacks through the use of technology, processes and controls, there are inherent limitations in such plans and systems, including the possibility that certain risks have not been identified, given the evolving nature of this threat. The use of artificial intelligence (“AI”) and machine learning could exacerbate these risks or result in cyber security incidents that implicate personal data. Each Fund relies on third-party service providers for many of its day-to-day operations, and will be subject to the risk that the protections and protocols implemented by those service providers will be ineffective to protect the Fund from cyber-attack. The Adviser does not control the cybersecurity plans and systems put in place by third-party service providers, and such third-party service providers may have limited indemnification obligations to the Adviser or the Funds. Similar types of cybersecurity risks or technical malfunctions also are present for issuers of securities in which each Fund invests, which could result in material adverse consequences for such issuers, and may cause a Fund's investment in such securities to lose value.

Portfolio Holdings Disclosure

The Funds' portfolio holdings disclosure policy is described in the Statement of Additional Information (“SAI”).

Management and Organization

Investment Adviser

Expense Limitations and Reductions. From time to time, the Adviser may enter into a contractual agreement to waive a portion of its management fee and/or reimburse certain expenses (a “Contractual Expense Limitation”). As of the date of this Prospectus, the Adviser has not entered into any Contractual Expense Limitations for the Funds. In addition to any applicable contractual expense limitation for a Fund, which would be described in the Fund Summaries, each of the Adviser and State Street Global Advisors Funds Distributors, LLC (each a “Service Provider”) also may voluntarily reduce all or a portion of its fees and/or reimburse expenses for a Fund or a share class to the extent necessary to maintain a certain minimum net yield, which may vary from time to time and from share class to share class within a Fund, in SSGA FM's sole discretion (any such waiver or reimbursement of expenses being referred to herein as a “Voluntary Reduction”).

A discussion regarding the Board's consideration of the Funds' Investment Advisory Agreement will be included in the Funds' Form N-CSR filing with the SEC for the period ended June 30, 2025.

The Administrator, Sub-Administrator and Custodian

The Adviser serves as administrator of each Fund. Each Fund operates under what is essentially an all-in fee structure where each Fund will pay the Adviser an investment advisory fee and separately pay the Adviser a unitary operations and administration fee (the “Operations and Administration Fee”). The Operations and Administration Fee each Fund

pays to the Adviser is computed as a percentage of the Fund's assets. The Adviser, in turn, provides or procures operational, fund administration and other administrative services for the Fund and its shareholders. The Adviser bears the cost of various third-party services required by each Fund, including audit, custodial, portfolio accounting, legal, transfer agency and printing costs (including those costs incurred indirectly through such Fund's investment in its corresponding master portfolio). The Funds bear other expenses that are not covered under the investment advisory fee or Operations and Administration Fee, such as 0.25% under the Shareholder Service and Administration Plan; organizational expenses; costs of borrowing money, including interest expenses; investment advisory fees; extraordinary expenses (such as litigation and indemnification expenses); expenses incurred in preparing, printing, and mailing proxy statements and related materials (each a “Proxy”) to shareholders of a Fund; associated expenses of conducting meetings of a Fund's shareholders in conjunction to a Proxy; and fees and expenses of trustees who are not deemed to be “interested persons” (as defined in the 1940 Act) of the Trust and their counsel. The Adviser believes that the Operations and Administration Fee structure provides shareholders with fees that are largely non-variable, simple, and predictable. Pursuant to the Operations and Administration Fee structure, the Adviser is responsible for bearing the costs of services provided by financial intermediaries, such as recordkeeping, sub-transfer agency, sub-accounting and other services to the extent these costs exceed 0.25% borne by a Fund under the Shareholder Service and Administration Plan discussed below. Any portion of such expenses may also be borne by the Adviser or its affiliates and out of its or their profits. Each Fund pays Operations and Administration Fee, which is borne at the share class level and may vary by share class, to the Adviser at the annual rate of 0.14%.

State Street Bank and Trust Company (“State Street”), a subsidiary of State Street Corporation, serves as the sub-administrator and custodian for the Funds for a fee that is paid from the Operations and Administration Fee. SSGA FM serves as administrator of the Portfolios and State Street serves as sub-administrator and custodian of the Portfolios.

The Transfer Agent and Dividend Disbursing Agent

SS&C GIDS, Inc. is the Funds' transfer agent and dividend disbursing agent (the “Transfer Agent”).

The Distributor

State Street Global Advisors Funds Distributors, LLC serves as the Funds' distributor (“SSGA FD”) pursuant to the Distribution Agreement between SSGA FD and the Trust.

Shareholder Service and Administrative Services Provided by Intermediaries

Pursuant to a Shareholder Service and Administration Plan adopted by the Board, the Funds may enter into agreements with intermediaries that require them to provide service to their customers who beneficially own Advantage Class shares of the Funds. The shareholder service and administration fee rate borne by the Advantage Class shares is an annual rate of up to 0.25%. These arrangements, as well as administrative services provided by financial intermediaries, are further described in the SAI under “Shareholder Service and Administration” and “Payments to Financial Intermediaries – Advantage Share Class”.

Additional Information

Shareholder Information

Determination of Net Asset Value

The Treasury Plus Fund and the Government Fund each determines its net asset value (“NAV”) per share once each Business Day (as defined below), typically at 5:00 p.m. ET and the Treasury Fund determines its NAV per share once each Business Day, typically at 2:30 p.m. ET (the time when a Fund determines its NAV per share is referred to herein

as the “Valuation Time”). The Funds reserve the right to advance the time for accepting purchase or redemption orders and/or the Valuation Time on any day when the NYSE, bond markets (as recommended by The Securities Industry and Financial Markets Association (“SIFMA”)) or any Federal Reserve bank close early, trading on the NYSE is restricted, an emergency arises or as otherwise permitted by the SEC. The Funds reserve the right to continue to accept orders to purchase or redeem shares following the close of the NYSE on any day on which the NYSE closes early, provided that either the Federal Reserve or the bond markets remain open. In addition, the Board may, for any Business Day, decide to change the time as of which a Fund's NAV is calculated in response to new developments such as altered trading hours, or as otherwise permitted by the SEC.

Investing in State Street Institutional Investment Trust Shares

Mutual funds advised by SSGA FM (the “State Street Funds”) and their service providers have a legal obligation to collect from you certain personal information about you at the time you open an account in order to verify your identity and the source of your payment. If you do not provide this information, you may not be able to open an account with the State Street Funds. If the State Street Funds believe that they have uncovered unlawful activity, the State Street Funds and their service providers may close your account and take any action they deem reasonable or required by law. The State Street Funds reserve the right to reject any purchase order.

This section of the Prospectus explains the basics of doing business with the State Street Funds. Carefully read each topic. The policies set forth below regarding the purchase, redemption and exchange of State Street Fund shares are in addition to the “Purchase and Sale of Fund Shares” section contained in the “Fund Summary” portion of this Prospectus. The State Street Funds reserve the right to change the following policies, without notice to shareholders; except that any modification or termination of the exchange privileges described in this Prospectus will be preceded by 60 days' advance notice to shareholders. Please call or check online for current information. Requests for transactions in the State Street Funds will be processed when they are received in “good order.” “Good order” means that the request is in an accurate and complete form, and all applicable documents have been received in such accurate and complete form (including, typically, a signed application and medallion-guaranteed documents), and, for a purchase request, the check or wired funds have cleared.

Purchasing Shares

Investors pay no sales load to invest in the Advantage Class shares of the Funds. The price for Fund Shares is the NAV per share. Purchase requests received by a Fund in good order (a purchase request is in good order if it meets the requirements implemented from time to time by the Transfer Agent or authorized agent of the Fund, and for new accounts includes submission of a completed and signed application and all documentation necessary to open an account) on a Business Day will, if payment is received by FedWire, be priced at the NAV next determined after the order is accepted by the Fund. Payments received by FedWire prior to the last Valuation Times will earn dividend accrual for that purchase.

The minimum initial investment in Advantage Class of the Funds is $1 million, although the Adviser may waive the minimum in its discretion. Holdings of related customer accounts may be aggregated for purposes of determining the minimum investment amount. “Related customer accounts” may include but are not limited to accounts held by the same investment or retirement plan, financial institution, broker, dealer or intermediary. The Funds and the Adviser reserve the right to increase or decrease the minimum amount required to open or maintain an account. There is no minimum subsequent investment, except in relation to maintaining certain minimum account balances (See “Redeeming Shares” below). The Funds require prior notification of subsequent investments in excess of $10 million for the Treasury Fund and $50 million for Government Fund and Treasury Plus Fund.

The Funds reserve the right to cease accepting investments at any time or to reject any investment order. In addition, the Government Fund and the Treasury Plus Fund may limit the amount of a purchase order received after 3:00 p.m. ET. The Treasury Fund may limit the amount of a purchase order received after 12:00 p.m. (noon) ET.

How to Purchase Shares

By Mail:

An initial investment in the Funds must be preceded or accompanied by a completed, signed Institutional Account

Application Form, sent to:

State Street Funds

P.O. Box 219737

Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds

801 Pennsylvania Avenue, Suite 219737

Kansas City, MO 64105-1307

By Telephone/Fax:

An initial investment in the Funds must be preceded or accompanied by a completed, signed Institutional Account

Application Form, faxed to (816) 218-0400. Call the Fund at (866) 392-0869 between the hours of 8:00 a.m. ET

and 6:00 p.m. ET to:

➢ confirm receipt of the faxed Institutional Account Application Form (initial purchases only),

➢ request your new account number (initial purchases only),

➢ confirm the amount being wired and wiring bank, and

➢ receive a confirmation number for your purchase order (your trade is not effective until you have received a

confirmation number from the Fund).

For your initial investment, send the original, signed Institutional Account Application Form to the address above.

Wire Instructions:

Instruct your bank to transfer money by Federal Funds wire to:

State Street Bank and Trust Company

1 Iron Street

Boston, MA 02210

ABA# 011000028

DDA# 9904-631-0

State Street Institutional Investment Trust

Fund Name

Class Name

Account Number

Account Registration

On Columbus Day and Veterans Day, you will not be able to purchase shares by wiring Federal Funds because the

Federal Funds wiring does not occur on those days. Payment for Fund Shares must be in Federal Funds (or

converted to Federal Funds by the Transfer Agent) by the close of the Federal Reserve.

The Funds and the Funds' agents are not responsible for transfer errors by the sending or receiving bank and will

not be liable for any loss incurred due to a wire transfer not having been received.

Redeeming Shares

An investor may redeem all or any portion of its investment. Redemption orders are processed at the NAV next determined after a Fund receives a redemption order in good form.

If a Fund receives a redemption order in good form prior to 2:30 p.m. ET for the Treasury Fund and 5:00 p.m. ET for the Treasury Plus Fund and the Government Fund on a Business Day, the Fund typically expects to pay out redemption proceeds on that day, but no later than the next Business Day if redemption proceeds are sent by wire or ACH.

and the Treasury Plus Fund, the Fund typically expects to pay out redemption proceeds on the next Business Day (and dividends will accrue up to, but not including, the day that redemption proceeds are sent), but no later than the following Business Day. The Fund may postpone and/or suspend redemption and payment beyond the foregoing time periods only as follows:

For any period during which there is a non-routine closure of the Fedwire or applicable Federal Reserve Banks;

For any period (1) during which the NYSE is closed other than customary week-end and holiday closings or (2) during which trading on the NYSE is restricted;

For any period during which the SEC has, by rule or regulation, deemed that (1) trading shall be restricted or (2) an emergency exists;

For any period that the SEC, may by order permit for your protection; or

Rule 2a-7 as adopted by the SEC permits a money market fund to impose a liquidity fee upon the sale of fund shares under certain circumstances, however the Treasury Fund, Treasury Plus Fund and the Government Fund are all government money market funds that have not elected to be subject to the liquidity fee provision of Rule 2a-7. Although each Fund attempts to maintain its NAV at $1.00 per share, there can be no assurance that it will be successful, and there can be no assurance that a shareholder will receive $1.00 per share upon any redemption.

A Fund may pay all or a portion of your redemption proceeds by giving you securities (for example, if the Fund reasonably believes that a cash redemption may have a substantial impact on the Fund and its remaining shareholders). A redemption is generally a taxable event for shareholders, regardless of whether the redemption is satisfied in cash or in kind. You may pay transaction costs and/or taxes to dispose of the securities, and you may receive less for them than the price at which they were valued for purposes of the redemption. In addition, you will be subject to the market risks associated with such securities until such time as you choose to dispose of the security.

How to Redeem Shares


By Mail:	Send a signed letter to: State Street Institutional Investment Trust Funds P.O. Box 219737 Kansas City, MO 64121-9737
	The letter should include information necessary to process your request as described below. The Fund may require a medallion guarantee in certain circumstances. See “Medallion Guarantees” below.
By Overnight:	State Street Institutional Investment Trust Funds 801 Pennsylvania Avenue, Suite 219737 Kansas City, MO 64105-1307
By Telephone:	Please call (866) 392-0869 between the hours of 8:00 a.m. and 6:00 p.m. ET.
The Funds will need the following information to process your redemption request:
➢ name(s) of account owners; ➢ account number(s); ➢ the name of the Fund; ➢ your daytime telephone number; and ➢ the dollar amount or number of shares being redeemed.

On any day that the Funds calculate their NAVs earlier than normal, the Funds reserve the right to adjust the times noted above for purchasing and redeeming shares.

Medallion Guarantees. Certain redemption requests must include a medallion guarantee for each registered account owner if any of the following apply:

•

Your account address has changed within the last 10 Business Days.

•

Redemption proceeds are being transferred to an account with a different registration.

•

A wire is being sent to a financial institution other than the one that has been established on your Fund account.

•

Other unusual situations as determined by the Transfer Agent.

The Funds may terminate the receipt of redemption orders by telephone at any time, in which case you may redeem shares by other means.

If you choose to purchase or redeem shares by sending instructions by regular mail, they will not be deemed received in good order until they are released by the post office and redelivered to the Transfer Agent's physical location at 801 Pennsylvania Avenue, Suite 219737 in Kansas City, MO 64105-1307. There will be a time lag, which may be one or more days, between regular mail receipt at the post office box and redelivery to such physical location in Kansas City, and a Fund's NAV may change over those days. You might consider using express rather than regular mail if you believe the time of receipt of your transaction request to be sensitive.

Exchanging Shares

An exchange occurs when you use the proceeds from the redemption of shares of a Fund in the State Street Institutional Investment Trust to simultaneously purchase shares of a different Fund in the State Street Institutional Investment Trust. Currently, exchanging shares is allowed from/to each Fund.Exchanges may be made between different Funds within the same class (i.e., Advantage Class shares for Advantage Class shares). The account holding the original shares must be registered in the same name as the account holding the new shares received in the exchange. You may make exchange requests by telephone, or by mail. See Purchasing Shares and Redeeming Shares. Exchanges are subject to the terms applicable to the purchases of the fund into which you are exchanging. Exchange privileges may not be available for mutual funds advised by SSGA FM (the “State Street Funds”) and may be suspended or rejected.

Excessive Trading

Delivery of Documents to Accounts Sharing an Address

To reduce expenses, we may mail only one copy of the Funds' Prospectus and each annual and semi-annual report to those addresses shared by two or more accounts. If you wish to receive individual copies of these documents, please call us at (866) 392-0869, or contact your financial institution. We will begin sending you individual copies thirty (30) days after receiving your request.

Unclaimed Property

Many states have unclaimed property rules that provide for transfer to the state (also known as “escheatment”) of unclaimed property under various circumstances. These circumstances include inactivity (e.g., no owner-initiated contact for a certain period), returned mail (e.g., when mail sent to a shareholder is returned by the post office as undeliverable), or a combination of both inactivity and returned mail. If a State Street Fund identifies property as unclaimed, it will attempt to contact the shareholder, but if that attempt is unsuccessful, the account may be considered abandoned and escheated to the state after the passage of a certain period of time (as required by applicable state law).

Dividends, Distributions and Tax Considerations

Each Fund will elect to be treated as a regulated investment company and intends each year to qualify and to be eligible to be treated as such. A regulated investment company generally is not subject to tax at the corporate level on income and gains that are timely distributed to shareholders. In order to qualify and be eligible for treatment as a regulated investment company, a Fund must, among other things, satisfy diversification, 90% gross income and distribution requirements. A Fund's failure to qualify as a regulated investment company would result in corporate level taxation, and consequently, a reduction in income available for distribution to shareholders.

For U.S. federal income tax purposes, distributions of investment income are generally taxable to you as ordinary income. Taxes on distributions of capital gains generally are determined by how long the applicable Portfolio or Fund owned (or is deemed to have owned) the investments that generated them, rather than how long you have owned your Fund Shares. Any net short-term gains the Funds distribute will be taxable to you as ordinary income. The Funds generally do not expect to make distributions that are eligible for taxation as long-term capital gains.

Distributions are taxable to you even if they are paid from income or gains earned by a Fund before your investment (and thus were included in the price you paid for your shares). Distributions may also be subject to state and local taxes and are taxable whether you receive them in cash or reinvest them in additional shares. Distributions in excess of a Fund's current and accumulated earnings and profits are treated as a return of capital to the extent of your basis in the applicable Fund's shares, and, in general, as capital gain thereafter.

If the NAV of Fund Shares were to vary from $1.0000 per share, shareholders generally would realize a gain or loss upon the redemption or other taxable disposition of such Fund Shares. Any such gain generally would be taxable to you as either short-term or long-term capital gain, depending upon how long you held the Fund Shares. The Internal Revenue Service (the “IRS”) has issued final regulations and published guidance that permit a simplified method of accounting for gains and losses realized upon the disposition of money market fund shares. Shareholders should see the SAI for further information.

An additional 3.8% Medicare contribution tax is imposed on the “net investment income” of individuals, estates and trusts to the extent their income exceeds certain threshold amounts. Net investment income generally includes for this purpose dividends paid by a Fund and net gains recognized on the redemption (or other taxable disposition) of Fund Shares.

Financial Highlights

The Advantage Class shares of the Funds have not yet completed a full calendar year of investment operations. Once the Advantage Class shares of the Funds have completed a full calendar year of operations, financial highlight tables will be provided.

Contacting the State Street Funds

Online:	www.ssga.com	24 hours a day, 7 days a week
Phone:	(877) 521-4083	Monday – Friday 8:00 am – 6:00 pm EST

Written requests should be sent to:

Regular mail	Overnight/Registered, Express, Certified Mail
State Street Funds P.O. Box 219737 Kansas City, MO 64121-9737	State Street Funds 801 Pennsylvania Avenue, Suite 219737 Kansas City, MO 64105-1307

For more information about the Funds:

The Funds' SAI includes additional information about the Funds and is incorporated by reference into this document. Additional information about the Funds' investments will be available in the Funds' initial annual or semi-annual reports to shareholders and in each Fund's Form N-CSR. In a Fund's Form N-CSR, you will find the Fund's annual and semi-annual financial statements. The Funds' SAI is available, without charge, upon request. The Funds' annual and semi-annual reports will be available, without charge, upon request. Shareholders in the Funds may make inquiries to the Funds to receive such information by calling (877) 521-4083 or the customer service center at the telephone number shown in the accompanying contract prospectus, if applicable. Each Fund's Prospectus, SAI, annual and semi-annual reports to shareholders and other information such as each Fund's financial statements are available, or will be available, free of charge, on the Funds' website at www.ssga.com.

SSGA Funds Management, Inc

ONE IRON STREET

BOSTON, MASSACHUSETTS 02210

SSIITADVANTAGE PROThe State Street Institutional Investment Trust's Investment Company Act File Number is 811-09819.

STATE STREET INSTITUTIONAL INVESTMENT TRUST
(the “Trust”)
One Iron Street
Boston, Massachusetts 02210

STATEMENT OF ADDITIONAL INFORMATION

April 30, 2025

STATE STREET INSTITUTIONAL LIQUID RESERVES GOVERNMENT MONEY MARKET FUND (formerly STATE STREET INSTITUTIONAL LIQUID RESERVES FUND)
Premier Class (SSIXX)
Investment Class (SSVXX)
Institutional Class (SSHXX)
Investor Class (SSZXX)
Administration Class (SSYXX)
Trust Class (TILXX)
Opportunity Class (OPIXX)

STATE STREET INSTITUTIONAL TREASURY MONEY MARKET FUND
Premier Class (TRIXX)
Investment Class (TRVXX)
Select Class (TYSXX)
Institutional Class (SSJXX)
Investor Class (SSNXX)
Administration Class (SSKXX)
Opportunity Class (OPRXX)

STATE STREET INSTITUTIONAL TREASURY PLUS MONEY MARKET FUND
Premier Class (TPIXX)
Investment Class (TPVXX)
Select Class (TPSXX)
Institutional Class (SAJXX)
Investor Class (SAEXX)
Administration Class (SSQXX)
Trust Class (TPLXX)
Opportunity Class (OPTXX)

STATE STREET INSTITUTIONAL U.S. GOVERNMENT MONEY MARKET FUND
Premier Class (GVMXX)
Investment Class (GVVXX)
Select Class (GVSXX)
Institutional Class (SAHXX)
Investor Class (SAMXX)
Administration Class (SALXX)
Class G (SSOXX)
Opportunity Class (OPGXX)
Trust Class (GVBXX)

STATE STREET TREASURY OBLIGATIONS MONEY MARKET FUND (TAQXX)

This Statement of Additional Information (“SAI”) relates to the prospectuses dated April 30, 2025 as may be revised and/or supplemented from time to time thereafter for each of the Funds listed above (each, a “Prospectus” and collectively, the “Prospectuses”).

The SAI is not a prospectus and should be read in conjunction with the Prospectuses. A copy of each Prospectus can be obtained free of charge by calling (877) 521-4083 or by written request to the Trust at the address listed above.

Each Fund's audited financial statements for the fiscal year ended December 31, 2024, including the independent registered public accounting firm reports thereon, are included in the Fund's Form N-CSR filing for the fiscal year ended December 31, 2024 and are incorporated into this SAI by reference. Copies of the each Fund's annual reports, semi-annual reports, and other information such as each Fund's financial statements are available, without charge, upon request, by calling (877) 521-4083 or by written request to the Trust at the address above.

COMBOMMSAI

TABLE OF CONTENTS

GENERAL	4
DESCRIPTION OF THE FUNDS AND THEIR INVESTMENTS AND RISKS	5
ADDITIONAL INVESTMENTS AND RISKS	5
MANAGEMENT OF THE TRUST AND STATE STREET MASTER FUNDS	18
PROXY VOTING PROCEDURES	26
CONTROL PERSONS AND PRINCIPAL HOLDERS OF SECURITIES	26
INVESTMENT ADVISORY AND OTHER SERVICES	34
BROKERAGE ALLOCATION AND OTHER PRACTICES	42
DECLARATION OF TRUST, CAPITAL STOCK AND OTHER INFORMATION	43
PRICING OF SHARES	44
TAXATION OF THE FUNDS	45
UNDERWRITER	56
FINANCIAL STATEMENTS	56
APPENDIX A—RATINGS OF DEBT INSTRUMENTS	A-1
APPENDIX B—TRUST'S PROXY VOTING POLICY AND PROCEDURES	B-1
APPENDIX C – ADVISER'S PROXY VOTING PROCEDURES AND GUIDELINES	C-1

GENERAL

The Trust was organized as a business trust under the laws of The Commonwealth of Massachusetts on February 16, 2000.

The Trust is an open-end management investment company. The Trust includes the following diversified series:

•State Street Aggregate Bond Index Fund;

•State Street Aggregate Bond Index Portfolio;

•State Street Balanced Index Fund;

•State Street Emerging Markets Equity Index Fund;

•State Street Equity 500 Index Fund;

•State Street Equity 500 Index II Portfolio;

•State Street Federal Government Money Market Fund;

•State Street Federal Treasury Money Market Fund;

•State Street Federal Treasury Plus Money Market Fund;

•State Street Global All Cap Equity ex-U.S. Index Fund;

•State Street Global All Cap Equity ex-U.S. Index Portfolio;

•State Street Hedged International Developed Equity Index Fund;

•State Street Income Fund;

•State Street International Developed Equity Index Fund;

•State Street Institutional Liquid Reserves Government Money Market Fund (the “ILR Government Fund”);

•State Street Institutional Treasury Money Market Fund (the “Treasury Fund”);

•State Street Institutional Treasury Plus Money Market Fund (the “Treasury Plus Fund”);

•State Street Institutional U.S. Government Money Market Fund (the “U.S. Government Fund”);

•State Street Small/Mid Cap Equity Index Fund;

•State Street Small/Mid Cap Equity Index Portfolio;

•State Street Target Retirement Fund;

•State Street Target Retirement 2025 Fund;

•State Street Target Retirement 2030 Fund;

•State Street Target Retirement 2035 Fund;

•State Street Target Retirement 2040 Fund;

•State Street Target Retirement 2045 Fund;

•State Street Target Retirement 2050 Fund;

•State Street Target Retirement 2055 Fund;

•State Street Target Retirement 2060 Fund;

•State Street Target Retirement 2065 Fund;

•State Street Target Retirement 2070 Fund;

•State Street Treasury Obligations Money Market Fund (the “Treasury Obligations Fund”);

•State Street U.S. Core Equity Fund.

The ILR Government Fund, Treasury Fund, Treasury Plus Fund, U.S. Government Fund, and Treasury Obligations Fund are referred to in this SAI as the “Money Funds,” “Money Market Funds,” or the “Funds.” The Treasury Fund, Treasury Plus Fund and the Treasury Obligations Fund are also sometimes separately referred to in this SAI as the “Treasury Funds.”

Each Fund listed below as a feeder fund (each a “Feeder Fund” and collectively the “Feeder Funds”) seeks to achieve its investment objective by investing substantially all of its investable assets in a corresponding master portfolio in the State Street Master Funds that has substantially similar investment strategies to those of the Feeder Fund. The table below shows the respective Portfolio in which each Feeder Fund invests. All Portfolios together are referred to in this SAI as the “Portfolios” and each Portfolio may be referred to in context as the “Portfolio” as appropriate.

Feeder Fund	Master Portfolio
ILR Government Fund	State Street U.S. Government Money Market Portfolio (“U.S. Government Portfolio”)
Treasury Fund	State Street Treasury Money Market Portfolio (“Treasury Portfolio”)
Treasury Plus Fund	State Street Treasury Plus Money Market Portfolio (“Treasury Plus Portfolio”)
U.S. Government Fund	U.S. Government Portfolio
Treasury Obligations Fund	Treasury Plus Portfolio

The Treasury Portfolio, Treasury Plus Portfolio and U.S. Government Portfolio are referred to in this SAI as the “Money Portfolios,” or “Money Market Portfolios.” The Treasury Portfolio and Treasury Plus Portfolio are also sometimes separately referred to in this SAI as the “Treasury Portfolios.”

Trust Class shares of the ILR Government Fund are issued only to former shareholders of SSGA Prime Money Market Fund and SSGA Money Market Fund, each a series of SSGA Funds. Trust Class shares of the Treasury Plus Fund are issued only to former shareholders of SSGA U.S. Treasury Money Market Fund, a series of SSGA Funds.

Effective March 10, 2025, State Street Institutional Liquid Reserves Fund changed its name to State Street Institutional Liquid Reserves Government Money Market Fund and began investing substantially all of its investable assets in the U.S. Government Portfolio. Prior to March 10, 2025, the ILR Government Fund invested substantially all of its investable assets in State Street Money Market Portfolio.

DESCRIPTION OF THE FUNDS AND THEIR INVESTMENTS AND RISKS

Each Fund's Prospectus contains information about the investment objective and policies of that Fund. This SAI should only be read in conjunction with the Prospectus of the Fund or Funds in which you intend to invest.

In addition to the principal investment strategies and the principal risks of the Funds and Portfolios described in each Fund's Prospectus, a Fund or Portfolio may employ other investment practices and may be subject to additional risks, which are described below. In reviewing these practices of the Feeder Funds, you should assume that the practices of the corresponding Portfolio are the same in all material respects.

ADDITIONAL INVESTMENTS AND RISKS

To the extent consistent with its investment objective and restrictions, each Fund or Portfolio may invest in the following instruments and use the following techniques, and is subject to the following additional risks.

Auction Rate Securities.

Auction rate municipal securities permit the holder to sell the securities in an auction at par value at specified intervals. The dividend or interest is typically reset by “Dutch” auction in which bids are made by broker-dealers and other institutions for a certain amount of securities at a specified minimum yield. The rate set by the auction is the lowest interest or dividend rate that covers all securities offered for sale. While this process is designed to permit auction rate securities to be traded at par value, there is the risk that an auction will fail due to insufficient demand for the securities. A Portfolio will take the time remaining until the next scheduled auction date into account for purposes of determining the securities' duration.

Cash Reserves

political subdivisions; (ii) other short- term debt securities rated at the time of purchase Aa or higher by Moody's Investors Service, Inc. (“Moody's”) or AA or higher by Standard & Poor's Rating Group (“S&P”) or, if unrated, of comparable quality in the opinion of SSGA Funds Management, Inc. (the “Adviser” or “SSGA FM”); (iii) commercial paper; (iv) bank obligations, including negotiable certificates of deposit, time deposits and bankers' acceptances; and (v) repurchase agreements.

Cleared Derivatives Transactions

Transactions in some types of derivatives are required to be centrally cleared by applicable rules and regulations and a Fund may also voluntarily centrally clear other transactions that are available for clearing. In a cleared derivatives transaction, a Portfolio's counterparty to the transaction is a central derivatives clearing organization, or clearing house, rather than a bank or broker. Because the Portfolios are not members of a clearing house, and only members of a clearing house can participate directly in the clearing house, the Portfolios hold cleared derivatives through accounts at clearing members. In cleared derivatives transactions, a Portfolio will make payments (including margin payments) to and receive payments from a clearing house through its accounts at clearing members. Clearing members guarantee performance of their clients' obligations to the clearing house. Centrally cleared derivative arrangements may be less favorable to a Portfolio than bilateral (non-cleared) arrangements. For example, a Portfolio may be required to provide greater amounts of margin for cleared derivatives transactions than for bilateral derivatives transactions. Also, in contrast to bilateral derivatives transactions, a clearing member generally can require termination of existing cleared derivatives transactions at any time and can increase margin requirements above the margin that the clearing member required at the beginning of a transaction. Clearing houses also have broad rights to increase margin requirements for existing transactions or to terminate transactions at any time. Each Portfolio is subject to risk if it enters into a derivatives transaction that is required to be cleared (or which the Adviser expects to be cleared), and no clearing member is willing or able to clear the transaction on the Portfolio's behalf. In that case, the transaction might have to be terminated, and the Portfolio could lose some or all of the benefit of the transaction, including loss of an increase in the value of the transaction and loss of hedging protection. In addition, the documentation governing the relationship between the Portfolios and clearing members is drafted by the clearing members and generally is less favorable to the Portfolios than typical bilateral derivatives documentation. For example, documentation relating to cleared derivatives generally includes a one-way indemnity by the Portfolio in favor of the clearing member for losses the clearing member incurs as the Portfolio's clearing member. Also, such documentation typically does not provide the Portfolio any remedies if the clearing member defaults or becomes insolvent.

Counterparty risk with respect to derivatives has been and will continue to be affected by rules and regulations relating to the derivatives market. With respect to a centrally cleared transaction, a party is subject to the credit risk of the clearing house and the clearing member through which it holds its cleared position. Credit risk of market participants with respect to centrally cleared derivatives is concentrated in a few clearing houses, and increasingly fewer clearing members. It is not clear how an insolvency proceeding of a clearing house would be conducted and what impact an insolvency of a clearing house would have on the financial system. A clearing member is obligated by contract and regulation to segregate all funds received from customers with respect to cleared derivatives positions from the clearing member's proprietary assets. However, all funds and other property received by a clearing member from its customers with respect to cleared derivatives are generally held by the clearing member on a commingled basis in an omnibus account (which can be invested in instruments permitted under the regulations). Therefore, a Portfolio might not be fully protected in the event of the bankruptcy of the Portfolio's clearing member because the Portfolio would be limited to recovering only a pro rata share of the funds held by the clearing member on behalf of customers with respect to the relevant account class, with a claim against the clearing member for any deficiency. Also, the clearing member is required to transfer to the clearing house the amount of margin required by the clearing house for cleared derivatives, which amount is generally held in an omnibus account at the clearing house for all customers of the clearing member. Regulations promulgated by the Commodity Futures Trading Commission (the “CFTC”) require that the clearing member notify the clearing house of the initial margin provided by the clearing member to the clearing house that is attributable to each customer. However, if the clearing member does not accurately report the Portfolio's initial margin, the Portfolio is subject to the risk that a clearing house will use the assets attributable to it in the clearing house's omnibus account to satisfy payment obligations a defaulting customer of the clearing member has to the clearing house. In addition, clearing members generally provide the clearing house the net amount of variation margin required for cleared derivatives for all of its customers, rather than individually for each customer. A Portfolio is therefore subject to the risk that a clearing house will not make variation margin payments owed to the Portfolio if another customer of the clearing member has suffered a loss and is in default, and the risk that the Portfolio will be required to provide additional margin to the clearing house before the clearing house will move the Portfolio's cleared derivatives positions to another clearing member. In addition, if a clearing member does

not comply with the applicable regulations or its agreement with the Portfolio, fails to maintain accurate records or in the event of fraud or misappropriation of customer assets by a clearing member, the Portfolio could have only an unsecured creditor claim in an insolvency of the clearing member with respect to the margin held by the clearing member. In addition, a Portfolio may be subject to execution risk if it enters into a derivatives transaction that is required to be (or the Portfolio expects to be) cleared, and no clearing member is willing to clear the transaction on the Portfolio's behalf. In that case, the transaction might have to be terminated, and the Portfolio could lose some or all of the benefit of any increase in the value of the transaction after the time of the trade.

Russia Sanctions Risk

Following Russia's invasion of Ukraine in late February 2022, various countries, including the U.S. and the U.K., as well as the E.U., issued broad-ranging economic sanctions against Russia. The U.S. and other countries have also imposed economic sanctions on Belarus and may impose sanctions on other countries that support Russia's invasion. A large number of corporations and U.S. states have also announced plans to divest interests or otherwise curtail business dealings with certain Russian businesses. These sanctions and any additional sanctions or other intergovernmental actions that have been or may be undertaken in the future, against Russia, Russian entities or Russian individuals, or other countries that support Russia's military invasion, may result in the devaluation of Russian currency, a downgrade in the country's credit rating, an immediate freeze of Russian assets, a decline in the value and liquidity of Russian securities, property or interests, and/or other adverse consequences to the Russian economy or a Portfolio. The scope and scale of sanctions in place at a particular time may be expanded or otherwise modified in a way that have negative effects on a Portfolio. Sanctions, or the threat of new or modified sanctions, could impair the ability of a Portfolio to buy, sell, hold, receive, deliver or otherwise transact in certain affected securities or other investment instruments. Sanctions could also result in Russia taking counter measures or other actions in response (including cyberattacks and espionage), which may further impair the value and liquidity of Russian securities. These sanctions, and the resulting disruption of the Russian economy, may cause volatility in other regional and global markets and may negatively impact the performance of various sectors and industries, as well as companies in other countries, which could have a negative effect on the performance of a Portfolio, even if a Portfolio does not have direct exposure to securities of Russian issuers. As a collective result of the imposition of sanctions, Russian government countermeasures and the impact that they have had on the trading markets for Russian securities, certain Portfolios have used, and may in the future use, fair valuation procedures approved by the Portfolio's Board to value certain Russian securities, which could result in such securities being deemed to have a zero value.

Swap Execution Facilities

Certain derivatives contracts are required to be (or are capable of being) executed through swap execution facilities (“SEFs”). A SEF is a trading platform where multiple market participants can execute derivatives by accepting bids and offers made by multiple other participants in the platform. For derivatives that are required to be traded on a SEF, such requirements may make it more difficult and costly for investment funds, such as a Portfolio, to enter into highly tailored or customized transactions. Trading derivatives on a SEF may offer certain advantages over traditional bilateral over-the-counter trading, such as ease of execution, price transparency, increased liquidity and/or favorable pricing. Execution through a SEF is not, however, without additional costs and risks, as parties are required to comply with SEF and CFTC rules and regulations, including disclosure and recordkeeping obligations, and SEF rights of inspection, among others. SEFs typically charge fees, and if a Portfolio executes derivatives on a SEF through a broker intermediary, the intermediary may impose fees as well. A Portfolio also may be required to indemnify a SEF, or a broker intermediary who executes derivatives on a SEF on the Portfolio's behalf, against any losses or costs that may be incurred as a result of the Portfolio's transactions on the SEF. In addition, a Portfolio may be subject to execution risk if it enters into a derivatives transaction that is required to be (or the Adviser expects to be) executed on a SEF and cleared, and no SEF or clearing member is willing to accept and clear the transaction on the Portfolio's behalf. In that case, the transaction might have to be terminated, and the Portfolio could lose some or all of the benefit of any increase in the value of the transaction after the time of the trade.

Risks Associated with Derivatives Regulation

example, by making some types of derivatives no longer available to the Portfolio, increasing margin or capital requirements, or otherwise limiting liquidity or increasing transaction costs. While the rules and regulations and central clearing of some derivatives transactions are designed to reduce systemic risk (i.e., the risk that the interdependence of large derivatives dealers could cause them to suffer liquidity, solvency or other challenges simultaneously), there is no assurance that they will achieve that result, and in the meantime, as noted above, central clearing and related requirements expose the Portfolios to other kinds of costs and risks.

In the event of a counterparty's (or its affiliate's) insolvency, a Portfolio's ability to exercise remedies, such as the termination of transactions, netting of obligations and realization on collateral, could be stayed or eliminated under special resolution regimes adopted in the United States, the E.U., the U.K. and various other jurisdictions. Such regimes provide government authorities with broad authority to intervene when a financial institution is experiencing financial difficulty. In particular, with respect to counterparties who are subject to such proceedings in the E.U. and the U.K., the liabilities of such counterparties to the Portfolios could be reduced, eliminated, or converted to equity in such counterparties (sometimes referred to as a “bail in”).

The Securities and Exchange Commission (“SEC”) adopted Rule 18f-4 under the 1940 Act providing for the regulation of registered investment companies' use of derivatives and certain related instruments. The rule, among other things, limits derivatives exposure through one of two value-at-risk tests and in connection with adopting the rule, the SEC eliminated the asset segregation framework for covering derivatives and certain financial instruments arising from the SEC's Release 10666 and ensuing staff guidance. The rule also requires funds to adopt and implement a derivatives risk management program (including the appointment of a derivatives risk manager and the implementation of certain testing requirements) and subjects funds to certain reporting requirements in respect of derivatives. Limited derivatives users (as determined by Rule 18f-4) are not, however, subject to the full requirements under the rule.

Additionally, U.S. regulators, the EU, the U.K. and certain other jurisdictions have adopted minimum margin and capital requirements for uncleared derivatives transactions. These rules impose minimum margin requirements on derivatives transactions between a Portfolio and its counterparties and may increase the amount of margin a Portfolio is required to provide. They impose regulatory requirements on the timing of transferring margin and the types of collateral that parties are permitted to exchange.

These and other regulations are evolving, so their full impact on the Portfolios and the financial system are not yet known.

Custodial Risk

There are risks involved in dealing with the custodians or brokers who hold a Portfolio's investments or settle a Portfolio's trades. It is possible that, in the event of the insolvency or bankruptcy of a custodian or broker, a Portfolio would be delayed or prevented from recovering its assets from the custodian or broker, or its estate, and may have only a general unsecured claim against the custodian or broker for those assets. In recent insolvencies of brokers or other financial institutions, the ability of certain customers to recover their assets from the insolvent's estate has been delayed, limited, or prevented, often unpredictably, and there is no assurance that any assets held by a Portfolio with a custodian or broker will be readily recoverable by the Portfolio. In addition, there may be limited recourse against non-U.S. sub-custodians in those situations in which a Portfolio invests in markets where custodial and/or settlement systems and regulations are not fully developed, including emerging markets, and the assets of the Portfolio have been entrusted to such sub-custodians. SSGA FM or an affiliate may serve as the custodian of the Portfolios.

Forward Commitments

Each Fund may invest in forward commitments. Each Fund may contract to purchase securities for a fixed price at a future date beyond customary settlement time consistent with the Fund's ability to manage its investment portfolio and meet redemption requests. A Fund may dispose of a commitment prior to settlement if it is appropriate to do so and realize short-term profits or losses upon such sale. Forward commitments involve a risk of loss if the value of the security to be purchased declines prior to the settlement date, or if the other party fails to complete the transaction.

Government Mortgage-Related Securities

the U.S. Government, regardless of whether they have been collected. GNMA pass-through securities are, however, subject to the same interest rate risk as comparable privately issued mortgage-related securities. Therefore, the effective maturity and market value of a Portfolio's GNMA securities can be expected to fluctuate in response to changes in interest rate levels.

Residential mortgage loans are also pooled by the Federal Home Loan Mortgage Corporation (“FHLMC” or “Freddie Mac”), a corporate instrumentality of the U.S. Government. The mortgage loans in FHLMC's portfolio are not government backed; FHLMC, not the U.S. Government, guarantees the timely payment of interest and ultimate collection of principal on FHLMC securities. FHLMC also issues guaranteed mortgage certificates, on which it guarantees semiannual interest payments and a specified minimum annual payment of principal.

The Federal National Mortgage Association (“FNMA” or “Fannie Mae”) is a government-sponsored corporation owned entirely by private stockholders. It is subject to general regulation by the Secretary of Housing and Urban Development. FNMA purchases residential mortgages from a list of approved seller/servicers, which include savings and loan associations, savings banks, commercial banks, credit unions and mortgage bankers. Pass-through securities issued by FNMA are guaranteed as to timely payment of principal and interest only by FNMA, not the U.S. Government.

Illiquid Securities

Each Portfolio may invest in illiquid securities. The absence of a regular trading market for illiquid securities imposes additional risks on investments in these securities. Illiquid securities may be difficult to value and may often be disposed of only after considerable expense and delay.

Each Money Market Portfolio (and Money Market Fund) is managed in accordance with Rule 2a-7 under the Investment Company Act of 1940, as amended (the “1940 Act”). As a result, each Money Market Portfolio (and Money Market Fund) has adopted the following liquidity policies (except as noted):

The Portfolio/Fund may not purchase an illiquid security if, immediately after purchase, the Portfolio/Fund would have invested more than 5% of its total assets in illiquid securities (securities that cannot be sold or disposed of in the ordinary course of business within seven days at approximately the market value ascribed to them by the Portfolio/Fund);

The Portfolio/Fund may not purchase a security other than a security offering daily liquidity if, immediately after purchase, the Portfolio/Fund would have invested less than 25% of its total assets in securities offering daily liquidity (includes securities that mature or are subject to demand within one business day, cash, direct U.S. Government obligations or amounts receivable and due unconditionally within one business day on pending sales of portfolio securities); and

The Portfolio/Fund may not purchase a security other than a security offering weekly liquidity if, immediately after purchase, the Portfolio/Fund would have invested less than 50% of its total assets in securities offering weekly liquidity (includes securities that mature or are subject to demand within five business days, cash, direct U.S. Government obligations, Government agency discount notes with remaining maturities of 60 days or less or amounts receivable and due unconditionally within five business days on pending sales of portfolio securities).

Under Rule 2a-7, “illiquid security” means a security that cannot be sold or disposed of in the ordinary course of business within seven calendar days at approximately the value ascribed to it by the seller.

Industrial Development and Private Activity Bonds

Industrial development bonds are issued to finance a wide variety of capital projects including: electric, gas, water and sewer systems; ports and airport facilities; colleges and universities; and hospitals. The principal security for these bonds is generally the net revenues derived from a particular facility, group of facilities, or in some cases, the proceeds of a special excise tax or other specific revenue sources. Although the principal security behind these bonds may vary, many provide additional security in the form of a debt service reserve fund whose money may be used to make principal and interest payments on the issuer's obligations. Some authorities provide further security in the form of a state's ability without obligation to make up deficiencies in the debt service reserve fund.

Private activity bonds are considered municipal securities if the interest paid thereon is exempt from federal income tax and they are issued by or on behalf of public authorities to raise money to finance various privately operated facilities for business and manufacturing, housing, sports, and pollution control. These bonds are also used to finance public facilities such as airports, mass transit systems, ports and parking. The payment of the principal and interest on such bonds is dependent solely on the ability of the facility's user to meet its financial obligations and the value of any real or personal property pledged as security for such payment.

Interest income on these bonds may be an item of tax preference subject to federal alternative minimum tax for shareholders subject to such tax.

Insured Municipal Securities

Insured municipal securities are those for which scheduled payments of interest and principal are guaranteed by a private (non-governmental) insurance company. The insurance entitles a fund to receive only the face or par value of the securities held by the fund, but the ability to be paid is limited to the claims paying ability of the insurer. The insurance does not guarantee the market value of the municipal securities or the net asset value (“NAV”) of a Portfolio's shares. Insurers are selected based upon the diversification of their portfolios and the strength of the management team which contributes to the claims paying ability of the entity. However, the Adviser selects securities based upon the underlying credit, with bond insurance viewed as an enhancement only. The Adviser's objective is to have an enhancement that provides additional liquidity to insulate against volatility in changing markets.

Market Disruption and Geopolitical Risk

The Portfolios are subject to the risk that geopolitical events will disrupt securities markets and adversely affect global economies and markets. War, terrorism, and related geopolitical events have led, and in the future may lead, to increased short-term market volatility and may have adverse long-term effects on U.S. and world economies and markets generally. Likewise, trade policy changes or disputes, natural and environmental disasters, epidemics or pandemics, and systemic market dislocations may be highly disruptive to economies and markets. Those events as well as other changes in non-U.S. and domestic economic and political conditions also could adversely affect individual issuers or related groups of issuers, securities markets, interest rates, credit ratings, inflation, investor sentiment, and other factors affecting the value of a Portfolio's investments. Given the increasing interdependence between global economies and markets, conditions in one country, market, or region might adversely impact markets, issuers and/or foreign exchange rates in other countries, including the U.S. Continuing uncertainty as to the status of the euro and the Economic and Monetary Union of the European Union (the “EMU”) has created significant volatility in currency and financial markets generally. Any partial or complete dissolution of the EMU, or any increased uncertainty as to its status, could have significant adverse effects on currency and financial markets, and on the values of a Fund's investments. On January 31, 2020, the United Kingdom (“UK”) formally withdrew from the European Union (“EU”) (commonly known as “Brexit”). An agreement between the UK and the EU governing their future trade relationship became effective January 1, 2021, but that agreement does not include an agreement on financial services, and it is unlikely that such agreement will be concluded. Moreover, the UK government has started a program of financial services law reform with the ultimate aim of repealing many EU financial services laws that were assimilated into UK law from January 1, 2021, and replacing them with legislation or rules made by the UK government or financial services regulators. Accordingly, uncertainty remains in certain areas as to the future relationship between the UK and the EU. Brexit has already had a significant impact on the UK, Europe, and global economies, and could continue to result in volatility and illiquidity, legal, political, economic and regulatory uncertainties and lower economic growth for these economies that could in turn have an adverse effect on the value of the Funds' investments. Any further exits from the EU, or the possibility of such exits, or the abandonment of the euro, may cause additional market disruption globally and introduce new legal and regulatory uncertainties.

Securities markets may be susceptible to market manipulation or other fraudulent trade practices, which could disrupt the orderly functioning of these markets or adversely affect the value of investments traded in these markets, including investments of a Fund.

government services, which could negatively affect the U.S. economy, decrease the value of many Fund investments, and increase uncertainty in or impair the operation of the U.S. or other securities markets. To the extent a Fund has focused its investments in the stock market index of a particular region, adverse geopolitical and other events could have a disproportionate impact on the Fund.

Market Turbulence Resulting from Infectious Illness

A widespread outbreak of an infectious illness may lead to governments and businesses world-wide taking aggressive measures, including closing borders, restricting international and domestic travel, and the imposition of prolonged quarantines of large populations. The spread of such an illness may result in the disruption of and delays in the delivery of healthcare services and processes, the cancellation of organized events and educational institutions, the disruption of production and supply chains, a decline in consumer demand for certain goods and services, and general concern and uncertainty, all of which may contribute to increased volatility in global markets. Epidemics and pandemics that may arise in the future could adversely affect the economies of many nations, the global economy, individual companies, economic sectors and industries, and capital markets in ways that cannot be foreseen at the present time. In addition, the impact of infectious diseases in developing or emerging market countries may be greater due to limited healthcare resources. Political, economic and social stresses caused by an infectious illness also may exacerbate other pre-existing political, social and economic risks in certain countries. The duration of such an illness and its effects cannot be determined at this time, but the effects could be present for an extended period of time.

Mortgage-Related Securities

The Portfolios, except for the Treasury Portfolios, may invest in mortgage-related securities. Mortgage-related securities represent an interest in a pool of, or are secured by, mortgage loans. Mortgage-related securities may be issued or guaranteed by (i) U.S. Government agencies or instrumentalities such as GNMA, FNMA and FHLMC or (ii) other issuers, including private companies.

Many mortgage-related securities provide regular payments which consist of interest and, in most cases, principal. In contrast, other forms of debt securities normally provide for periodic payment of interest in fixed amounts with principal payments at maturity or specified call dates. In effect, payments on many mortgage-related securities are a “pass-through” of the payments made by the individual borrowers on their mortgage loans, net of any fees paid to the issuer or guarantor of such securities.

Because of the possibility of prepayments (and due to scheduled repayments of principal), mortgage-related securities are less effective than other types of securities as a means of “locking in” attractive long-term interest rates. Prepayments would have to be reinvested at lower rates. As a result, these securities may have less potential for capital appreciation during periods of declining interest rates than other securities of comparable maturities, although they may have a similar risk of decline in market value during periods of rising interest rates. Prepayments may also significantly shorten the effective maturities of these securities, especially during periods of declining interest rates. Conversely, during periods of rising interest rates, a reduction in prepayments may increase the effective maturities of these securities, subjecting them to a greater risk of decline in market value in response to rising interest rates than traditional debt securities, and, therefore, potentially increasing the volatility of the Portfolios.

Ongoing developments in the residential and commercial mortgage markets may have additional consequences for the market for mortgage-backed securities. During the periods of deteriorating economic conditions, such as recessions or periods of rising unemployment, delinquencies and losses generally increase, sometimes dramatically, with respect to securitizations involving mortgage loans. Many sub-prime mortgage pools have become distressed during the periods of economic distress and may trade at significant discounts to their face value during such period.

Collateralized mortgage obligations (“CMOs”) may be issued by a U.S. Government agency or instrumentality or by a private issuer. CMOs are typically structured with classes or series that have different maturities and are generally retired in sequence. Each class of obligations receives periodic interest payments according to its terms. However, monthly principal payments and any prepayments from the collateral pool are generally paid first to the holders of the most senior class. Thereafter, payments of principal are generally allocated to the next most senior class of obligations until that class of obligations has been fully repaid. Any or all classes of obligations of a CMO may be paid off sooner than expected because of an increase in the payoff speed of the pool. Changes in prepayment rates may have significant effects on the values and the volatility of the various classes and series of a CMO. Payment of interest or principal on some classes or series of a CMO may be subject to contingencies or some classes or series may bear some or all of the risk of default on the underlying mortgages. Stripped mortgage-related securities are usually structured with two classes that receive different portions of the interest and principal distributions on a pool of mortgage loans. The yield to maturity on an interest only or “IO” class of stripped mortgage-related securities is extremely sensitive not only to changes in prevailing interest rates but also to the rate of principal payments (including prepayments) on the underlying assets. A rapid rate of principal prepayments may have a measurable adverse effect on a Fund's yield to maturity to the extent it invests in IOs. If the assets underlying the IO experience greater than anticipated prepayments of principal, the Fund may fail to recoup fully, or at all, its initial investment in these securities. Conversely, principal only securities or “POs” tend to increase in value if prepayments are greater than anticipated and decline if prepayments are slower than anticipated. The secondary market for stripped mortgage-related securities may be more volatile and less liquid than that for other mortgage-related securities, potentially limiting a Portfolio's ability to buy or sell those securities at any particular time.

Municipal and Municipal-Related Securities

The Portfolios may invest in municipal and municipal-related securities. Municipal securities may bear fixed, floating or variable rates of interest or may be zero coupon securities. Municipal securities are generally of two types: general obligations and revenue obligations. General obligations are backed by the full faith and credit of the issuer. These securities include tax anticipation notes, bond anticipation notes, general obligation bonds and commercial paper. Revenue obligations are backed by the revenues generated from a specific project or facility and include industrial development bonds and private activity bonds. Tax anticipation notes are issued to finance working capital needs of municipalities and are generally issued in anticipation of future tax revenues. Bond anticipation notes are issued in expectation of the issuer obtaining longer-term financing.

Municipal obligations are affected by economic, business or political developments. These securities may be subject to provisions of litigation, bankruptcy and other laws affecting the rights and remedies of creditors, or may become subject to future laws extending the time for payment of principal and/or interest, or limiting the rights of municipalities to levy taxes. The Portfolio may be more adversely impacted by changes in tax rates and policies than other funds. Because interest income from municipal securities is normally not subject to regular federal income taxation, the attractiveness of municipal securities in relation to other investment alternatives is affected by changes in federal income tax rates applicable to, or the continuing federal income tax-exempt status of, such interest income. Any proposed or actual changes in such rates or exempt status, therefore, can significantly affect the demand for and supply, liquidity and marketability of municipal securities. This could in turn affect a Portfolio's ability to acquire and dispose of municipal securities at desirable yield and price levels. Concentration of a Portfolio's investments in these municipal obligations will subject the Portfolio, to a greater extent than if such investment was not so concentrated, to the risks of adverse economic, business or political developments affecting the particular state, industry or other area of concentration. Issuers, including governmental issuers, of municipal securities may be unable to pay their obligations as they become due. Recent declines in tax revenues, and increases in liabilities, such as pension and healthcare liabilities, may increase the actual or perceived risk of default on such securities.

Municipal Leases

The Portfolios may purchase participation interests in municipal obligations, including municipal lease/purchase agreements. Municipal leases are an undivided interest in a portion of an obligation in the form of a lease or installment purchase issued by a state or local government to acquire equipment or facilities. These instruments may have fixed, floating or variable rates of interest, with remaining maturities of 13 months or less. Certain participation interests may permit a Portfolio to demand payment on not more than seven days' notice, for all or any part of the Portfolio's interest, plus accrued interest.

Municipal leases frequently have special risks not normally associated with general obligation or revenue bonds. Some leases or contracts include “non-appropriation” clauses, which provide that the governmental issuer has no obligation to make future payments under the lease or contract unless money is appropriated for such purpose by the appropriate legislative body on a yearly or other periodic basis. To reduce these risks, the Portfolios will only purchase municipal leases subject to a non-appropriation clause when the payment of principal and accrued interest is backed by a letter of credit or guarantee of a bank.

Whether a municipal lease agreement will be considered illiquid for the purpose of a Portfolio's restriction on investments in illiquid securities will be determined in accordance with procedures established by the Board of Trustees.

Pre-Refunded Municipal Securities

The interest and principal payments on pre-refunded municipal securities are typically paid from the cash flow generated from an escrow fund consisting of U.S. Government securities. These payments have been “pre-refunded” using the escrow fund.

Purchase of Other Investment Company Shares

Each Portfolio may, to the extent permitted under the 1940 Act and the rules thereunder, invest in shares of other investment companies, which include funds managed by SSGA FM, which invest exclusively in money market instruments or in investment companies with investment policies and objectives which are substantially similar to those of the Portfolios. These investments may be made temporarily, for example, to invest uncommitted cash balances or, in limited circumstances, to assist in meeting shareholder redemptions, or as long-term investments. In general, the 1940 Act prohibits a Portfolio from acquiring more than 3% of the voting shares of any one other investment company, and prohibits a Portfolio investing more than 5% of its total assets in the securities of any one other investment company or more than 10% of its total assets in securities of other investment companies in the aggregate. The percentage limitations above apply to investments in any investment company. Pursuant to rules adopted by the SEC, the Portfolio may invest in excess of these limitations if the Fund and the investment company in which the Portfolio would like to invest comply with certain conditions. Certain of the conditions do not apply if the Portfolio is investing in shares issued by affiliated funds. In addition, the Portfolio may invest in shares issued by money market funds, including certain unregistered money market funds, in excess of the limitations. The Portfolio's investments in another investment company will be subject to the risks of the purchased investment company's portfolio securities. The Portfolio's shareholders must bear not only their proportionate share of the Portfolio's fees and expenses, but they also must bear indirectly the fees and expenses of the other investment company.

Recent Money Market Regulatory Reforms

On July 12, 2023, the SEC adopted amendments to money market fund regulation (“Money Market Fund Reform”) that increase the daily liquid asset requirements from 10% to 25% and increase the weekly liquid asset requirements from 30% to 50%. Money Market Fund Reform permits government money market funds (such as the Funds), that are experiencing a gross negative yield as a result of negative interest rates, to either convert from a stable share price to a floating share price or reduce the number of shares outstanding (through a reverse stock split) to maintain a stable net asset value per share, subject to certain Board determinations and disclosures to investors. Money Market Fund Reform, among other things, also imposes additional reporting requirements on money market funds.

Repurchase Agreements

Each Portfolio, except for the Treasury Portfolio, may enter into repurchase agreements with banks, other financial institutions, such as broker-dealers, and other institutional counterparties. Under a repurchase agreement, the Portfolio purchases securities from a financial institution that agrees to repurchase the securities at the Portfolio's original purchase price plus interest within a specified time. The Portfolio will limit repurchase transactions to those member banks of the Federal Reserve System, broker-dealers and other financial institutions whose creditworthiness the Adviser considers satisfactory. Should the counterparty to a transaction fail financially, the Portfolio may encounter delay and incur costs before being able to sell the securities, or may be prevented from realizing on the securities. Further, the amount realized upon the sale of the securities may be less than that necessary to fully compensate the Portfolio. The SEC has finalized new rules requiring the central clearing of certain repurchase transactions involving U.S. Treasuries. Historically, such transactions have not been required to be cleared and voluntary clearing of such transactions has generally been limited. While it is currently difficult to predict the full impact of these new rules particularly because the compliance date has not yet occurred and could be subject to delays, the new clearing requirements could make it more difficult for a Fund to execute certain investment strategies.

Reverse Repurchase Agreements

Each Portfolio, except the Treasury Portfolio, may enter into reverse repurchase agreements, which are a form of borrowing. Under reverse repurchase agreements, a Portfolio transfers possession of portfolio securities to financial institutions in return for cash in an amount equal to a percentage of the portfolio securities' market value and agrees to repurchase the securities at a future date by repaying the cash with interest. Each Portfolio retains the right to receive interest and principal payments from the securities. Reverse repurchase agreements involve the risk that the market value of securities sold by a Portfolio may decline below the price at which it is obligated to repurchase the securities. Reverse repurchase agreements involve the risk that the buyer of the securities sold might be unable to deliver them when a Portfolio seeks to repurchase the securities. If the buyer files for bankruptcy or becomes insolvent, a Portfolio may be delayed or prevented from recovering the security that it sold. The SEC has finalized new rules requiring the central clearing of certain repurchase transactions involving U.S. Treasuries. Historically, such transactions have not been required to be cleared and voluntary clearing of such transactions has generally been limited. While it is currently difficult to predict the full impact of these new rules particularly because the compliance date has not yet occurred and could be subject to delays, the new clearing requirements could make it more difficult for a Fund to execute certain investment strategies.

Tax Exempt Commercial Paper

The Portfolios may invest in tax exempt commercial paper. Tax exempt commercial paper is a short-term obligation with a stated maturity of 365 days or less. It is typically issued to finance seasonal working capital needs or as short-term financing in anticipation of longer term financing. Each instrument may be backed only by the credit of the issuer or may be backed by some form of credit enhancement, typically in the form of a guarantee by a commercial bank. Commercial paper backed by guarantees of foreign banks may involve additional risk due to the difficulty of obtaining and enforcing judgments against such banks and the generally less restrictive regulations to which such banks are subject. The Portfolios will only invest in commercial paper rated at the time of purchase not less than Prime-1 by Moody's, A-1 by S&P or F-1 by Fitch Ratings. See Appendix A for more information on the ratings of debt instruments.

Tender Option Bonds

A tender option is a municipal obligation (generally held pursuant to a custodial arrangement) having a relatively long maturity and bearing interest at a fixed rate substantially higher than prevailing short-term tax exempt rates, that has been coupled with the agreement of a third party, such as a bank, broker-dealer or other financial institution, pursuant to which such institution grants the security holders the option, at periodic intervals, to tender their securities to the institution and receive the face value thereof. As consideration for providing the option, the financial institution receives periodic fees equal to the difference between the municipal obligation's fixed coupon rate and the rate, as determined by a remarketing or similar agent at or near the commencement of such period, that would cause the securities, coupled with the tender option, to trade at par on the date of such determination. Thus, after payment of this fee, the security holder effectively holds a demand obligation that bears interest at the prevailing short-term tax exempt rate. Subject to applicable regulatory requirements, a Portfolio may buy tender option bonds if the agreement gives the Portfolio the right to tender the bond to its sponsor no less frequently than once every 397 days. The Adviser will consider on an ongoing basis the creditworthiness of the issuer of the underlying obligation, any custodian and the third-party provider of the tender option. In certain instances, and for certain tender option bonds, the option may be terminable in the event of a default in payment of principal or interest on the underlying municipal obligation and for other reasons.

Treasury Inflation-Protected Securities

The Portfolios may invest in Inflation-Protection Securities (“TIPSs”), a type of inflation-indexed Treasury security. TIPSs typically provide for semiannual payments of interest and a payment of principal at maturity. In general, each payment will be adjusted to take into account any inflation or deflation that occurs between the issue date of the security and the payment date based on the Consumer Price Index for All Urban Consumers (“CPI-U”).

Each semiannual payment of interest will be determined by multiplying a single fixed rate of interest by the inflation-adjusted principal amount of the security for the date of the interest payment. Thus, although the interest rate will be fixed, the amount of each interest payment will vary with changes in the principal of the security as adjusted for inflation and deflation.

TIPSs also provide for an additional payment (a “minimum guarantee payment”) at maturity if the security's inflation-adjusted principal amount for the maturity date is less than the security's principal amount at issuance. The amount of the additional payment will equal the excess of the security's principal amount at issuance over the security's inflation-adjusted principal amount for the maturity date.

U.S. Government Securities

Each Portfolio may purchase U.S. Government securities. With respect to U.S. Government securities, the Treasury Portfolio will invest exclusively in direct obligations of the U.S. Treasury, such as U.S. Treasury bills, notes and bonds generally maturing within 397 days, and other mutual funds, subject to regulatory limitations, that invest exclusively in such obligations. The Treasury Plus Portfolio will invest only in direct obligations of the U.S. Treasury (U.S. Treasury bills, notes and bonds) and repurchase agreements collateralized by these obligations. The types of U.S. Government obligations in which each other Portfolio may at times invest include: (1) U.S. Treasury obligations and (2) obligations issued or guaranteed by U.S. Government agencies and instrumentalities which are supported by any of the following: (a) the full faith and credit of the U.S. Treasury, (b) the right of the issuer to borrow an amount limited to a specific line of credit from the U.S. Treasury, (c) discretionary authority of the U.S. Government agency or instrumentality, or (d) the credit of the instrumentality (examples of agencies and instrumentalities are: Federal Land Banks, Federal Housing Administration, Federal Farm Credit Bank, Farmers Home Administration, Export-Import Bank of the United States, Central Bank for Cooperatives, Federal Intermediate Credit Banks, Federal Home Loan Banks, General Services Administration, Maritime Administration, Tennessee Development Bank, Asian-American Development Bank, International Bank for Reconstruction and Development and Federal National Mortgage Association (“Fannie Mae” or “FNMA”). No assurance can be given that in the future the U.S. Government will provide financial support to U.S. Government securities it is not obligated to support.

The Portfolios may purchase U.S. Government obligations on a forward commitment basis.

Variable and Floating Rate Securities

The Portfolios may invest in variable and floating rate securities. In general, variable rate securities are instruments issued or guaranteed by entities such as (1) U.S. Government, or an agency or instrumentality thereof, (2) corporations, (3) financial institutions, (4) insurance companies or (5) trusts that have a rate of interest subject to adjustment at regular intervals. A variable rate security provides for the automatic establishment of a new interest rate on set dates. Interest rates on these securities are ordinarily tied to widely recognized market rates, which are typically set once a day. Generally, changes in interest rates will have a smaller effect on the market value of variable and floating rate securities than on the market value of comparable fixed income obligations. Variable rate obligations will be deemed to have a maturity equal to the period remaining until the next readjustment of the interest rate.

When-Issued Securities

Each Portfolio may purchase securities on a when-issued basis. Delivery of and payment for these securities may take place as long as a month or more after the date of the purchase commitment. The value of these securities is subject to market fluctuation during this period, and no income accrues to the Portfolio until settlement takes place. When entering into a when-issued transaction, the Portfolio will rely on the other party to consummate the transaction; if the other party fails to do so, the Portfolio may be disadvantaged. The Portfolios will not invest more than 25% of their respective net assets in when-issued securities.

Securities purchased on a when-issued basis and held by a Portfolio are subject to changes in market value based upon actual or perceived changes in the level of interest rates. Generally, the value of such securities will fluctuate inversely to changes in interest rates — i.e., they will appreciate in value when interest rates decline and decrease in value when interest rates rise. Therefore, if in order to achieve higher interest income a Portfolio remains substantially fully invested at the same time that it has purchased securities on a “when-issued” basis, there will be a greater possibility of fluctuation in the Portfolio's NAV.

Zero Coupon Securities

discount, a Portfolio will be required to accrue original issue discount (“OID”) for U.S. federal income tax purposes and, in the case of a Portfolio treated as a regulated investment company (“RIC”), may as a result be required to pay out as an income distribution an amount which is greater than the total amount of cash interest the Portfolio actually received. To generate sufficient cash to make the requisite distributions to maintain its qualification for treatment as a RIC under the Internal Revenue Code of 1986, as amended (the “Code”), a Portfolio that is taxed as a RIC may be required to sell investments, including at a time when it may not be advantageous to do so.

The Portfolios may invest no more than 25% of their respective total assets in stripped securities that have been stripped by their holder, typically a custodian bank or investment brokerage firm. Privately-issued stripped securities are not themselves guaranteed by the U.S. Government, but the future payment of principal or interest on U.S. Treasury obligations which they represent is so guaranteed.

Fundamental Investment Restrictions

The Portfolios in which the Funds invest each have substantially the same investment restrictions as their corresponding Funds. In reviewing the description of a Fund's investment restrictions below, you should assume that the investment restrictions of the corresponding Portfolio are the same in all material respects as those of the Fund.

The Trust has adopted the following restrictions applicable to the Funds, which may not be changed without the affirmative vote of a “majority of the outstanding voting securities” of a Fund, which is defined in the 1940 Act to mean the affirmative vote of the lesser of (1) more than 50% of the outstanding shares of the Fund and (2) 67% or more of the shares present at a meeting if more than 50% of the outstanding shares are present at the meeting in person or by proxy.

A Fund may borrow money and issue senior securities to the extent consistent with applicable law from time to time.

A Fund may make loans, including to affiliated investment companies, to the extent consistent with applicable law from time to time.

A Fund may purchase or sell commodities to the extent consistent with applicable law from time to time.

A Fund may purchase, sell or hold real estate to the extent consistent with applicable law from time to time.

A Fund may underwrite securities to the extent consistent with applicable law from time to time.

For the Money Market Funds:

A Fund may not purchase any security if, as a result, 25% or more of the Fund's total assets (taken at current value) would be invested in a particular industry (for purposes of this restriction, investment companies are not considered to constitute a particular industry or group of industries), except as is consistent with applicable law from time to time and as follows: each Fund is permitted to invest without limit in “government securities” (as defined in the 1940 Act), tax-exempt securities issued by a U.S. territory or possession, a state or local government, or a political subdivision of any of the foregoing and bankers' acceptances, certificates of deposit and similar instruments issued by: (i) U.S. banks, (ii) U.S. branches of foreign banks (in circumstances in which the Adviser determines that the U.S. branches of foreign banks are subject to the same regulation as U.S. banks), (iii) foreign branches of U.S. banks (in circumstances in which the Adviser determines that the Fund will have recourse to the U.S. bank for the obligations of the foreign branch), and (iv) foreign branches of foreign banks (to the extent that the Adviser determines that the foreign branches of foreign banks are subject to the same or substantially similar regulations as U.S. banks).

With respect to investment policy on concentration (number 6 above), a Money Market Fund may concentrate in bankers' acceptances, certificates of deposit and similar instruments when, in the opinion of the Adviser, the yield, marketability and availability of investments meeting the Fund's quality standards in the banking industry justify any additional risks associated with the concentration of the Fund's assets in such industry.

Except for the investment restrictions expressly identified as fundamental, or to the extent designated as such in the Prospectus with respect to a Fund, the other investment policies described in this SAI or in the Prospectus are not fundamental and may be changed by approval of the Trustees without shareholder approval.

Non-Fundamental Investment Restrictions

Names Rule Policy

To the extent a Fund is subject to Rule 35d-1 under the 1940 Act, the Fund has an investment policy, described in the Fund's prospectus, to either (1) under normal circumstances, invest at least 80% of its assets in the particular types of investments suggested by the Fund's name, or (2) invest only in the particular type of investments suggested by the Fund's name (each a “Name Policy”). “Assets” for the purposes of a Name Policy are net assets plus the amount of any borrowings for investment purposes. The percentage limitation applies at the time of purchase of an investment. A Fund's Name Policy may be changed by the Board of Trustees without shareholder approval. However, to the extent required by SEC regulations, shareholders will be provided with at least sixty (60) days' notice prior to any change in a Fund's Name Policy.

Additional Information

Fundamental Investment Restrictions (1) through (5), as numbered above limit a Fund's ability to engage in certain investment practices and purchase securities or other instruments to the extent consistent with applicable law as that law changes from time to time. Applicable law includes the 1940 Act, the rules or regulations thereunder and applicable orders of SEC as are currently in place. In addition, interpretations and guidance provided by the SEC staff may be taken into account, where deemed appropriate by a Fund, to determine if an investment practice or the purchase of securities or other instruments is permitted by applicable law. As such, the effects of these limitations will change as the statute, rules, regulations or orders (or, if applicable, interpretations) change, and no shareholder vote will be required or sought when such changes permit or require a resulting change in practice.

Disclosure of Portfolio Holdings

Introduction

The policies set forth below to be followed by State Street Bank and Trust Company (“State Street”) and SSGA FM ( collectively, the “Service Providers”) for the disclosure of information about the portfolio holdings of SSGA Funds, State Street Master Funds, and State Street Institutional Investment Trust (each, a “Trust”). These disclosure policies are intended to ensure compliance by the Service Providers and the Trust with applicable regulations of the federal securities laws, including the 1940 Act and the Investment Advisers Act of 1940, as amended. The Board of Trustees must approve all material amendments to the policy.

General Policy

It is the policy of the Service Providers to protect the confidentiality of client holdings and prevent the selective disclosure of non-public information concerning the Trust.

No information concerning the portfolio holdings of the Trust may be disclosed to any party (including shareholders) except as provided below. The Service Providers are not permitted to receive compensation or other consideration in connection with disclosing information about a Fund's portfolio to third parties. In order to address potential conflicts between the interest of Fund shareholders, on the one hand, and those of the Service Providers or any affiliated person of those entities or of the Fund, on the other hand, the Fund's policies require that non-public disclosures of information regarding the Fund's portfolio may be made only if there is a legitimate business purpose consistent with fiduciary duties to all shareholders of the Fund.

The Board of Trustees exercises continuing oversight over the disclosure of each Fund's holdings by (i) overseeing the implementation and enforcement of the portfolio holding disclosure policy, Codes of Ethics and other relevant policies of each Fund and its service providers by the Trust's Chief Compliance Officer (“CCO”) and (2) considering reports and recommendations by the Trust's CCO concerning any material compliance matters (as defined in Rule 38a-1 under the 1940 Act). The Board reserves the right to amend the policy at any time without prior notice in its sole discretion.

Publicly Available Information. Any party may disclose portfolio holdings information after the holdings are publicly available.

Each Fund generally will post on its website (or, in the case of a Portfolio, on the corresponding Feeder Fund's website) a full list of its portfolio holdings each Friday reflecting the portfolio holdings of the fund on the immediately preceding Wednesday. Each Fund will also post a full list of its portfolio holdings on its website (or, in the case of a Portfolio, on the corresponding Fund's website) no later than the fifth business day of each month, reflecting its portfolio holdings as of the last business day of the previous month. Such monthly posting shall contain such information as required by Rule 2a-7(h)(10) under the 1940 Act and remain posted on the website for not less than six months. Each Fund is also required to file with the SEC its complete portfolio holdings in monthly reports on Form N-MFP, available on the SEC's website at www.sec.gov.

Information about each Fund's 10 largest holdings generally is posted on the Funds' website at SSGA.com within 30 days following the end of each month.

Press Interviews, Brokers and Other Discussions

Portfolio managers and other senior officers or spokespersons of the Service Providers or the Trust may disclose or confirm the ownership of any individual portfolio holding position to reporters, brokers, shareholders, consultants or other interested persons only if such information has been previously publicly disclosed in accordance with these disclosure policies. For example, a portfolio manager discussing the Trust may indicate that he owns XYZ Company for the Trust only if the Trust's ownership of such company has previously been publicly disclosed.

Trading Desk Reports

State Street Global Advisors' (“SSGA”) trading desk may periodically distribute lists of investments held by its clients (including the Trust) for general analytical research purposes. In no case may such lists identify individual clients or individual client position sizes. Furthermore, in the case of equity securities, such lists shall not show aggregate client position sizes.

Miscellaneous

Confidentiality Agreement. No non-public disclosure of the Funds' portfolio holdings will be made to any party unless such party has signed a written Confidentiality Agreement. For purposes of the disclosure policies, any Confidentiality Agreement must be in a form and substance acceptable to, and approved by, the Trust's officers.

Evaluation Service Providers. There are numerous mutual fund evaluation services (such as Morningstar, Inc. and Broadridge Financial Solutions, Inc., formerly, Lipper, Inc.) and due diligence departments of broker-dealers and wirehouses that regularly analyze the portfolio holdings of mutual funds in order to monitor and report on various attributes. These services and departments then distribute the results of their analysis to the public, paid subscribers and/or in-house brokers. In order to facilitate the review of the Trust by these services and departments, the Trust may distribute (or authorize the Service Providers and the Trust's custodian or fund accountants to distribute) month-end portfolio holdings to such services and departments only if such entity has executed a confidentiality agreement.

Additional Restrictions. Notwithstanding anything herein to the contrary, the Board of Trustees, State Street and SSGA FM may, on a case-by-case basis, impose additional restrictions on the dissemination of portfolio information beyond those found in these disclosure policies.

Waivers of Restrictions. These disclosure policies may not be waived, or exceptions made, without the consent of the Trust's officers. All waivers and exceptions involving the Trust will be disclosed to the Board of Trustees no later than its next regularly scheduled quarterly meeting.

Disclosures Required by Law. Nothing contained herein is intended to prevent the disclosure of portfolio holdings information as may be required by applicable law. For example, SSGA FM, State Street, the Trust or any of its affiliates or service providers may file any report required by applicable law (such as Schedules 13D, 13G and 13F or Form N-MFP), respond to requests from regulators and comply with valid subpoenas.

MANAGEMENT OF THE TRUST AND STATE STREET MASTER FUNDS

laws and regulations, and the Amended and Restated Declaration of Trust. The Trustees listed below are also Trustees of SSGA Funds, State Street Master Funds, State Street Navigator Securities Lending Trust (the “Navigator Trust”), State Street Institutional Funds, State Street Variable Insurance Series Funds, Inc., Elfun Diversified Fund, Elfun Government Money Market Fund, Elfun Tax-Exempt Income Fund, Elfun Income Fund, Elfun International Equity Fund and Elfun Trusts (collectively, the “Elfun Funds”), and their respective series. The following table provides information with respect to each Trustee, including those Trustees who are not considered to be “interested” as that term is defined in the 1940 Act (the “Independent Trustees”), and each officer of the Trusts.

Name, Address, and Year of Birth	Position(s) Held With Trust	Term of Office and Length of Time Served	Principal Occupation During Past Five Years and Relevant Experience	Number of Funds in Fund Complex Overseen by Trustee†	Other Directorships Held by Trustee During Past Five Years
INDEPENDENT TRUSTEES
PATRICK J. RILEY c/o SSGA Funds Management, Inc. One Iron Street Boston, MA 02210 YOB: 1948	Trustee and Chairperson of the Board	Term: Indefinite Elected: 1/14	Independent Director, State Street Global Advisors Europe Limited (investment company) (1998 – 2023); Independent Director, SSGA Liquidity plc (formerly, SSGA Cash Management Fund plc) (1998 – 2023); and Independent Director, SSGA Fixed Income plc (January 2009 – 2023).	55	Board Director and Chairman, SSGA SPDR ETFs Europe I plc Board (2011 – March 2023); Board Director and Chairman, SSGA SPDR ETFs Europe II plc (2013 – March 2023); Board Director, State Street Liquidity plc (1998 – March 2023).
MARGARET K. MCLAUGHLIN c/o SSGA Funds Management, Inc. One Iron Street Boston, MA 02210 YOB: 1967	Trustee, Chairperson of the Qualified Legal Compliance Committee, and Vice-Chairperson of the Valuation Committee	Term: Indefinite Elected: 12/24	Consultant, Bates Group (consultants) (September 2020 – January 2023); Consultant, Madison Dearborn Partners (private equity) (2019 – 2020).	55	Director, Manning & Napier Fund Inc (2021 – 2022).
GEORGE M. PEREIRA c/o SSGA Funds Management, Inc. One Iron Street Boston, MA 02210 YOB: 1964	Trustee, Chairperson of the Nominating Committee, Chairperson of the Governance Committee, and Vice-Chairperson of the Qualified Legal Compliance Committee	Term: Indefinite Elected: 12/24	Chief Operating Officer (January 2011 – September 2020) and Chief Financial Officer (November 2004 – September 2020), Charles Schwab Investment Management.	55	Director, Pave Finance Inc. (May 2023 – present); Director, Pacific Premier Bancorp, Pacific Premier Bank (2021 – present); Director, Charles Schwab Asset Management (Ireland) Ltd., & Charles Schwab Worldwide Funds plc. (2005 – 2020).
DONNA M. RAPACCIOLI c/o SSGA Funds Management, Inc. One Iron Street Boston, MA 02210 YOB: 1962	Trustee, Chairperson of the Audit Committee, Vice-Chairperson of the Nominating Committee, and Vice-Chairperson of the Governance Committee	Term: Indefinite Elected: 12/18	Dean of the Gabelli School of Business (2007 – June 2022) and Accounting Professor (1987 – present) at Fordham University.	55	Director- Graduate Management Admissions Council (2015 – 2022).
MARK E. SWANSON c/o SSGA Funds Management, Inc. One Iron Street Boston, MA 02210	Trustee, Chairperson of the Valuation Committee, and Vice-Chairperson	Term: Indefinite Elected: 12/24	Treasurer, Chief Accounting Officer and Chief Financial Officer, Russell Investment Funds (“RIF”) (1998 –	55	Director and President, Russell Investments Fund Services, LLC (2010 – 2023); Director, Russell Investment

Name, Address, and Year of Birth	Position(s) Held With Trust	Term of Office and Length of Time Served	Principal Occupation During Past Five Years and Relevant Experience	Number of Funds in Fund Complex Overseen by Trustee†	Other Directorships Held by Trustee During Past Five Years
YOB: 1963	of the Audit Committee		2022); Global Head of Fund Services, Russell Investments (2013 – 2022); Treasurer, Chief Accounting Officer and Chief Financial Officer, Russell Investment Company (“RIC”) (1998 – 2022); President and Chief Executive Officer, RIF (2016 – 2017 and 2020 to 2022); President and Chief Executive Officer, RIC (2016 – 2017 and 2020 – 2022).		Management, LLC, Russell Investments Trust Company and Russell Investments Financial Services, LLC (2010 – 2023).
INTERESTED TRUSTEE(1)
JEANNE LAPORTA(2) c/o SSGA Funds Management, Inc. One Iron Street Boston, MA 02210 YOB: 1965	Trustee	Term: Indefinite Elected: 12/24	Senior Managing Director and Head of Global Funds Management at State Street Global Advisors (August 2024 – present); Chief Administrative Officer at ClearAlpha Technologies LP (FinTech startup) (January 2021 – August 2024); Senior Managing Director at State Street Global Advisors (July 2016 – 2021); Manager of State Street Global Advisors Funds Distributors, LLC (May 2017 – 2021); Director of SSGA Funds Management, Inc. (March 2020 - 2021); President of State Street Institutional Funds and State Street Variable Insurance Series Funds, Inc. (April 2014 – March 2020).	213	Interested Trustee, Select Sector SDPR Trust, SPDR Series Trust, SDPR Index Shares Funds and SSGA Active Trust (November 2024 – present). Interested Trustee, Elfun Government Money Market Fund, Elfun Tax Exempt Income Fund, Elfun Income Fund, Elfun Diversified Fund, Elfun International Equity Fund Elfun Trusts (2016 – 2021).

†

For the purpose of determining the number of portfolios overseen by the Trustees, “Fund Complex” comprises registered investment companies for which SSGA FM serves as investment adviser.

(1)

The individual listed below is a Trustee who is an “interested person,” as defined in the 1940 Act, of the Trust (“Interested Trustee”).

(2)

Ms. LaPorta was elected as Interested Trustee effective January 1, 2025. Ms. LaPorta is an Interested Trustee because of her employment with State Street Global Advisors, an affiliate of the Trust.

The following lists the principal officers for the Trust and State Street Master Funds, as well as their mailing addresses and ages, positions with the Trusts and length of time served, and present and principal occupations:

Name, Address, and Year of Birth	Position(s) Held With Trust	Term of Office and Length of Time Served	Principal Occupation During Past Five Years
OFFICERS:
ANN M. CARPENTER SSGA Funds Management, Inc. One Iron Street Boston, MA 02210 YOB: 1966	President and Principal Executive Officer; Deputy Treasurer	Term: Indefinite Served: since 5/23 (with respect to President and Principal Executive Officer); Term: Indefinite Served: since 4/19 (with respect to Deputy Treasurer)	Chief Operating Officer, SSGA Funds Management, Inc. (April 2005 – present); Managing Director, State Street Global Advisors (April 2005 – present).
BRUCE S. ROSENBERG SSGA Funds Management, Inc. One Iron Street Boston, MA 02210 YOB: 1961	Treasurer and Principal Financial Officer	Term: Indefinite Served: since 2/16	Managing Director, State Street Global Advisors and SSGA Funds Management, Inc. (July 2015 – present).
CHAD C. HALLETT SSGA Funds Management, Inc. One Iron Street Boston, MA 02210 YOB: 1969	Deputy Treasurer	Term: Indefinite Served: since 2/16	Vice President, State Street Global Advisors and SSGA Funds Management, Inc. (November 2014 – present).
DARLENE ANDERSON-VASQUEZ SSGA Funds Management, Inc. One Iron Street Boston, MA 02210 YOB: 1968	Deputy Treasurer	Term: Indefinite Served: since 11/16	Managing Director, State Street Global Advisors and SSGA Funds Management, Inc. (May 2016 – present).
ARTHUR A. JENSEN SSGA Funds Management, Inc. 1600 Summer Street Stamford, CT 06905 YOB: 1966	Deputy Treasurer	Term: Indefinite Served: since 11/16	Vice President, State Street Global Advisors and SSGA Funds Management, Inc. (July 2016 – present).
DAVID LANCASTER SSGA Funds Management, Inc. One Iron Street Boston, MA 02210 YOB: 1971	Assistant Treasurer	Term: Indefinite Served: since 11/20	Vice President, State Street Global Advisors and SSGA Funds Management, Inc. (July 2017 – present).*
JOHN BETTENCOURT SSGA Funds Management, Inc. One Iron Street Boston, MA 02210 YOB:1976	Assistant Treasurer	Term: Indefinite Served: since 5/22	Vice President, State Street Global Advisors and SSGA Funds Management, Inc. (March 2020 – present).
VEDRAN VUKOVIC SSGA Funds Management, Inc. One Iron Street Boston, MA 02210 YOB: 1985	Assistant Treasurer	Term: Indefinite Served: since 2/24	Vice President, State Street Global Advisors (2023 – present); Assistant Vice President, Brown Brothers Harriman & Co. (2011 – 2023).
BRIAN HARRIS SSGA Funds Management, Inc. One Iron Street Boston, MA 02210 YOB: 1973	Chief Compliance Officer; Anti-Money Laundering Officer; Code of Ethics Compliance Officer	Term: Indefinite Served: since 7/16	Managing Director, State Street Global Advisors and SSGA Funds Management, Inc. (June 2013 – present).*
ANDREW J. DELORME SSGA Funds Management, Inc. One Iron Street Boston, MA 02210 YOB: 1975	Chief Legal Officer	Term: Indefinite Served: since 2/24	Managing Director and Managing Counsel, State Street Global Advisors (March 2023 – present); Counsel, K&L Gates (February 2021 – March 2023); Vice President and Senior Counsel, State Street Global Advisors (August 2014 – February 2021).

Name, Address, and Year of Birth	Position(s) Held With Trust	Term of Office and Length of Time Served	Principal Occupation During Past Five Years
DAVID BARR SSGA Funds Management, Inc. One Iron Street Boston, MA 02210 YOB: 1974	Secretary	Term: Indefinite Served: since 9/20	Vice President and Senior Counsel, State Street Global Advisors (October 2019 – present).
E. GERARD MAIORANA, JR. SSGA Funds Management, Inc. One Iron Street Boston, MA 02210 YOB: 1971	Assistant Secretary	Term: Indefinite Served: since 5/23	Assistant Vice President, State Street Global Advisors (July 2014 – present).
DAVID URMAN SSGA Funds Management, Inc. One Iron Street Boston, MA 02210 YOB: 1985	Assistant Secretary	Term: Indefinite Served: since 8/19	Vice President and Senior Counsel, State Street Global Advisors (April 2019 – present).

Served in various capacities and/or with various affiliated entities during noted time period.

The By-Laws of the Trust provide that the Trust shall indemnify each person who is or was a Trustee of the Trust against all expenses, judgments, fines, settlements and other amounts actually and reasonably incurred in connection with any proceedings if the person in good faith and reasonably believes that his or her conduct was in the Trust's best interest. The Trust, at its expense, provides liability insurance for the benefit of its Trustees and officers.

Summary of Trustees' Qualifications

Following is a summary of the experience, attributes and skills which qualify each Trustee to serve on the Boards of Trustees of the Trust and State Street Master Funds.

Patrick J. Riley: Mr. Riley is an experienced business executive with over 47 years of experience in the legal and financial services industries; his experience includes service as a trustee or director of various investment companies and Associate Justice of the Superior Court of the Commonwealth of Massachusetts. He has served on the Board of Trustees and related committees of the Trust for 35 years and possesses significant experience regarding the operations and history of the Trust. Mr. Riley serves as a Trustee of the Trust, Navigator Trust, SSGA Funds, State Street Master Funds, Elfun Funds, and State Street Institutional Funds and a Director of State Street Variable Insurance Series Funds, Inc.

Margaret K. McLaughlin: Ms. McLaughlin has over 27 years of experience she has gained in a variety of roles encompassing regulatory, operating, legal, and compliance functions, serving both firms and their boards. Ms. McLaughlin formerly served as a founding member of the executive management team for Kramer Van Kirk Credit Strategies L.P. and its technology affiliate, Mariana Systems LLC, where she was integrally involved in corporate strategy, operational oversight, risk management and board governance. Prior to Kramer Van Kirk, Ms. McLaughlin was Assistant General Counsel to Harris Associates L.P., where she was responsible for legal, regulatory and compliance activities related to the Oakmark Mutual Funds. Ms. McLaughlin has an extensive understanding and perspective on governance, oversight, regulation, policies and procedures from these positions as well as her prior experience with both the Securities and Exchange Commission and the Department of Justice. Ms. McLaughlin currently serves on the Governing Counsel of the Independent Directors Council. Most recently, Ms. McLaughlin has held consulting positions at a major private equity firm and a management consulting firm. Ms. McLaughlin serves as a Trustee of the Trust, Navigator Trust, SSGA Funds, State Street Master Funds, Elfun Funds, and State Street Institutional Funds and a Director of State Street Variable Insurance Series Funds, Inc.

George M. Pereira: Mr. Pereira has over 32 years of experience in executive management with financial institutions, including extensive experience relating to financial reporting, operations, cybersecurity oversight, and enterprise risk management. Mr. Pereira retired from Charles Schwab Investment Management Inc., having served as Chief Operating Officer and Chief Financial Officer during his tenure. Previously, Mr. Pereira also served as Head of Financial Reporting for Charles Schwab & Co., Inc. Earlier in his career, Mr. Pereira gained valuable regulatory experience and perspective while serving as managing director at the New York Stock Exchange. With this professional experience, Mr. Pereira has developed wide-ranging expertise in building and managing financial, operational, technology and risk control platforms for

growth and scale within the financial services industry. Additionally, Mr. Pereira is a member of the Latino Corporate Directors Association. Mr. Pereira serves as a Trustee of the Trust, Navigator Trust, SSGA Funds, State Street Master Funds, Elfun Funds, and State Street Institutional Funds and a Director of State Street Variable Insurance Series Funds, Inc.

Donna M. Rapaccioli: Ms. Rapaccioli has over 35 years of service as a full-time member of the business faculty at Fordham University, where she developed and taught undergraduate and graduate courses, including International Accounting and Financial Statement Analysis and has taught at the executive MBA level. Ms. Rapaccioli is dean emerita after serving as Dean of the Gabelli School of Business for 15 years. She has served on Association to Advance Collegiate Schools of Business accreditation team visits, as a director for the graduate management admissions council, as well as trustee at Emmanuel College. Ms. Rapaccioli has lectured on accounting and finance topics and consulted for numerous investment banks. Ms. Rapaccioli also serves as a Trustee of the Trust, Navigator Trust, SSGA Funds, State Street Master Funds, Elfun Funds, and State Street Institutional Funds and a Director of State Street Variable Insurance Series Funds, Inc.

Mark E. Swanson: Mr. Swanson has over 27 years of experience in executive management with financial services institutions, including extensive experience relating to, fund operations, financial reporting, fund accounting, and fund services. Mr. Swanson recently retired from Russell Investments, having served most recently as the Global Head of Fund Services. Additionally, Mr. Swanson served as Treasurer, Chief Accounting Officer and Chief Financial Officer of Russell Investment Company (“RIC”) and Russell Investment Funds (“RIF”). Previously, Mr. Swanson served as Global Head of Fund Operations for Russell, as well as serving in different directorships with RIC, RIF and other Russell entities. Mr. Swanson serves as a Trustee of the Trust, Navigator Trust, SSGA Funds, State Street Master Funds, Elfun Funds, and State Street Institutional Funds and a Director of State Street Variable Insurance Series Funds, Inc.

Jeanne LaPorta: Ms. LaPorta is a Senior Managing Director of State Street Global Advisors and head of Global Funds Management. Prior to joining SSGA, she was the Chief Administrative Officer of a Fintech startup and served as a director of their flagship hedge fund. Ms. LaPorta previously worked at State Street Global Advisors from 2016 to 2021 as a Senior Managing Director and at GE Asset Management (GEAM) from 1997 to July 2016 where she held various positions at GEAM, including Senior Vice President and Commercial Operations Leader, Senior Vice President and Commercial Administrative Officer, Senior Vice President and Deputy General Counsel and Vice President and Associate General Counsel.

References to the experience, attributes and skills of Trustees above are pursuant to requirements of the SEC, do not constitute holding out of the Board or any Trustee as having any special expertise or experience, and shall not impose any greater responsibility or liability on any such person or on the Board by reason thereof.

Standing Committees

The Board of Trustees has established various committees to facilitate the timely and efficient consideration of various matters of importance to Independent Trustees, the Trust, and the Trust's shareholders and to facilitate compliance with legal and regulatory requirements. Currently, the Board has created an Audit Committee, Governance Committee, Valuation Committee, Nominating Committee and Qualified Legal Compliance Committee (the “QLCC”).

The Audit Committee is composed of all of the Independent Trustees. The Audit Committee meets twice a year, or more often as required, in conjunction with meetings of the Board of Trustees. The Audit Committee oversees and monitors the Trust's internal accounting and control structure, its auditing function and its financial reporting process. The Audit Committee is responsible for selecting and retaining the independent accountants for the Trust. The Audit Committee is responsible for approving the audit plans, fees and other material arrangements in respect of the engagement of the independent accountants, including non-audit services performed. The Audit Committee reviews the qualifications of the independent accountant's key personnel involved in the foregoing activities and monitors the independent accountant's independence. During the fiscal year ended December 31, 2024, the Audit Committee held four meetings.

Each of the Governance Committee and the Nominating Committee is composed of all the Independent Trustees. The primary functions of the Governance Committee and the Nominating Committee are to review and evaluate the composition and performance of the Board; make nominations for membership on the Board and committees; review the responsibilities of each committee; and review governance procedures, compensation of Independent Trustees and independence of outside counsel to the Trustees. The Nominating Committee will consider nominees to the Board recommended by shareholders. Recommendations should be submitted in accordance with the procedures set forth in the Nominating Committee Charter and should be submitted in writing to the Trust, to the attention of the Trust's Secretary, at the address of the principal executive offices of the Trust. Shareholder recommendations must be delivered to, or mailed

and received at, the principal executive offices of the Trust not less than sixty (60) calendar days nor more than ninety (90) calendar days prior to the date of the Board or shareholder meeting at which the nominee candidate would be considered for election. The Governance Committee performs an annual self-evaluation of Board members. During the fiscal year ended December 31, 2024, the Governance Committee and Nominating Committee held four combined meetings.

The Valuation Committee is composed of all the Independent Trustees. The Valuation Committee's primary purpose is to review the actions and recommendations of the Adviser's Oversight Committee no less often than quarterly. The Trust has established procedures and guidelines for valuing portfolio securities and making fair value determinations from time to time through the Valuation Committee, with the assistance of the Oversight Committee, State Street and SSGA FM. During the fiscal year ended December 31, 2024, the Valuation Committee held four meetings.

The QLCC is composed of all the Independent Trustees. The primary functions of the QLCC are to receive quarterly reports from the CCO; to oversee generally the Trust's responses to regulatory inquiries; and to investigate matters referred to it by the Chief Legal Officer and make recommendations to the Board regarding the implementation of an appropriate response to evidence of a material violation of the securities laws or breach of fiduciary duty or similar violation by the Trust, its officers or the Trustees. During the fiscal year ended December 31, 2024, the QLCC held four meetings.

Leadership Structure and Risk Management Oversight

The Board has chosen to select different individuals as Chairperson of the Board of the Trust, as Chairperson and Vice-Chairperson of the Committees of the Board, and as President of the Trust. Currently, Mr. Riley, an Independent Trustee, serves as Chairperson of the Board, Ms. Rapaccioli serves as Chairperson of the Audit Committee, Ms. McLaughlin serves as Chairperson of the QLCC, Mr. Swanson serves as Chairperson of the Valuation Committee and Mr. Pereira serves as Chairperson of each of the Governance Committee and Nominating Committee. Mr. Swanson serves as Vice-Chairperson of the Audit Committee, Ms. McLaughlin serves as Vice-Chairperson of the Valuation Committee, Mr. Pereira serves as Vice-Chairperson of the QLCC, and Ms. Rapaccioli serves as Vice-Chairperson of each of the Governance Committee and Nominating Committee. Ms. Carpenter, who is an employee of the Adviser, serves as President of the Trust. The Board believes that this leadership structure is appropriate. Ms. Carpenter is available to provide the Board with insight regarding the Trust's day-to-day management when requested, while Mr. Riley provides an independent perspective on the Trust's overall operation and Ms. Rapaccioli provides a specialized perspective on audit matters.

The Board has delegated management of the Trust to service providers who are responsible for the day-to-day management of risks applicable to the Trust. The Board oversees risk management for the Trust in several ways. The Board receives regular reports from both the CCO and administrator for the Trust, detailing the results of the Trust's compliance with its Board-adopted policies and procedures, the investment policies and limitations of the Funds, and applicable provisions of the federal securities laws and the Code. As needed, the Adviser discusses management issues regarding the Trust with the Board, soliciting the Board's input on many aspects of management, including potential risks to the Funds. The Board's Audit Committee also receives reports on various aspects of risk that might affect the Trust and offers advice to management, as appropriate. The Trustees also meet in executive session with the independent counsel to the Independent Trustees, the independent registered public accounting firm, counsel to the Trust, the CCO and representatives of management, as needed. Through these regular reports and interactions, the Board oversees the risk management parameters for the Trust, which are effected on a day-to-day basis by service providers to the Trust.

Trustee Ownership of Securities of the Trust, Adviser and Distributor

As of December 31, 2024 none of the Independent Trustees or their immediate family members had any ownership of securities of the Adviser, State Street Global Advisors Funds Distributors, LLC (“SSGA FD” or the “Distributor”), the Trust's distributor, or any person directly or indirectly controlling, controlled by or under common control with the Adviser or SSGA FD.

The following table sets forth information describing the dollar range of the Trust's equity securities beneficially owned by each Trustee as of December 31, 2024.

Name of Trustee	Dollar Range Of Equity Securities In The Funds	Aggregate Dollar Range Of Equity Securities In All Registered Investment Companies Overseen By Trustees In Family of Investment Companies
Independent Trustees:
Patrick J. Riley	None	Over $100,000
John R Costantino(1)	None	None
Michael A. Jessee(1)	None	None
Margaret McLaughlin	None	None
George M. Pereira	None	None
Donna M. Rapaccioli	None	None
Mark E. Swanson	None	None
Interested Trustee:
Jeanne LaPorta(2)	None	None

(1)

Messrs. Costantino and Jessee retired from the Board of Directors of the Trust effective December 31, 2024.

(2)

Ms. LaPorta was elected as Interested Trustee effective January 1, 2025.

Trustee Compensation

Independent Trustees are compensated on a calendar year basis. An Interested Trustee does not receive compensation from the Funds for his or her service as a Trustee. Effective January 1, 2025, each Independent Trustee receives for his or her services to the State Street Master Funds, the Trust, the SSGA Funds, the Elfun Funds, the Navigator Trust, State Street Institutional Funds and State Street Variable Insurance Series Funds, Inc. (together, the “Fund Entities”) a $400,000 annual base retainer. In addition, the Chairperson of each of the Valuation Committee, QLCC, Nominating Committee and Governance Committee will receive an additional $25,000 stipend and the Chairperson of the Audit Committee will receive an additional $40,000 stipend. As of January 1, 2024, each Independent Trustee receives an additional $25,000 for each special in-person meeting and $5,000 for each special telephonic meeting. The Chairperson of the Board receives an additional $100,000 annual retainer. The total annual compensation paid to the Independent Trustees (other than telephonic and special meeting fees) is allocated to each Fund Entity as follows: a fixed amount of $21,000 will be allocated to each Fund Entity or, if applicable, each series thereof; and the remainder will be allocated among the Fund Entities or, if applicable, each series thereof that is not a feeder fund in a master-feeder structure, based on relative net assets. The Independent Trustees are reimbursed for travel and other out-of-pocket expenses in connection with meeting attendance. As of the date of this SAI, the Trustees were not paid pension or retirement benefits as part of the Trust's expenses. The Trust's officers are compensated by the Adviser and its affiliates.

The following table sets forth the total remuneration of Trustees and officers of the Trust for the fiscal year ended December 31, 2024:

Name of Trustee	Aggregate Compensation from the Trust	Pension or Retirement Benefits Accrued as Part of Trust Expenses	Estimated Annual Benefits Upon Retirement	Total Compensation from the Trust and Fund Complex Paid to Trustees
Independent Trustees:
Patrick J. Riley	$139,092	$0	$0	$490,000
John R. Costantino(1)	$110,706	$0	$0	$390,000
Michael A. Jessee(1)	$110,706	$0	$0	$390,000
Donna M. Rapaccioli	$110,706	$0	$0	$390,000
Margaret McLaughlin	$110,706	$0	$0	$390,000
George M. Pereira	$110,706	$0	$0	$390,000
Mark E. Swanson	$110,706	$0	$0	$390,000
Interested Trustee:
Jeanne LaPorta(2)	N/A	N/A	N/A	N/A

(1)

Messrs. Costantino and Jessee retired from the Board of Directors of the Trust effective December 31, 2024.

(2)

Ms. LaPorta was elected as Interested Trustee effective January 1, 2025.

PROXY VOTING PROCEDURES

The Board has delegated to the Adviser the responsibility to vote proxies on securities held by the Funds and Portfolios, subject to certain exceptions. The Board has retained authority to vote proxies for certain bank and bank holding company securities (“Bank Securities”) that may be held by one or more Funds and Portfolios from time to time. The Board has adopted the Institutional Shareholder Services, Inc.'s (“ISS”) benchmark proxy voting policy with respect to voting such Bank Securities' proxies. The Board has retained this authority in order to permit the Adviser to utilize exemptions from limitations arising under the Bank Holding Company Act of 1956, as amended, that might otherwise prevent the Adviser from investing a Fund's or Portfolio's assets in Bank Securities. Each of the Trust's and the Adviser's proxy voting policies, as well as ISS' benchmark proxy voting policy, are attached as an appendix to this SAI. Information regarding how a Fund or Portfolio voted proxies relating to its portfolio securities during the most recent twelve-month period ended June 30 is available: (1) without charge by calling 1-866-787-2257; (2) on the Funds' and Portfolios' website at https://www.ssga.com; and (3) on the SEC's website at https://www.sec.gov.

CONTROL PERSONS AND PRINCIPAL HOLDERS OF SECURITIES

As of March 31, 2025, the Trustees and officers of the Trust owned in the aggregate less than 1% of the shares of each class (if applicable) of each Fund.

Persons or organizations owning 25% or more of the outstanding shares of a Fund may be presumed to “control” (as that term is defined in the 1940 Act) a Fund. As a result, these persons or organizations could have the ability to approve or reject those matters submitted to the shareholders of such Fund for their approval.

As of March 31, 2025, to the knowledge of the Trust, the following persons held of record or beneficially through one or more accounts 25% or more of the outstanding shares of a Fund.

Name and Address	Percentage
State Street Institutional Liquid Reserves Government Money Market Fund – Premier Class State Street Bank & Trust FBO Cash Sweep Clients Attn : Cash Sweep Sup - Rick Letham 1200 Crown Colony Dr. CC13 Quincy, MA 02169-0938	46.02 %
State Street Bank & Trust FBO SSGA Pooled Investments Attn : Cash Sweep Sup 1200 Crown Colony Dr. CC13 Quincy, MA 02169-0938	37.64 %
State Street Institutional Liquid Reserves Government Money Market Fund – Investment Class Mass Abrop & Co, State Treasurer & Receiver General, Abandoned Property Division 1 Ashburton Place Boston, MA 02108-1518	100 %
State Street Institutional Liquid Reserves Government Money Market Fund – Institutional Class Phoebe Putney Health System Inc Po Box 3770 Albany, GA 31706-3770	43.65 %
Morgan Stanley Smith Barney LLC For the Exclusive Benefit of Customers of MSSB 1 New York Plz, FL 12TH New York, NY 10004-1965	36.64 %
State Street Institutional Liquid Reserves Government Money Market Fund – Investor Class State Street Bank & Trust FBO Cash Sweep Clients Attn : Cash Sweep Sup - Rick Letham 1200 Crown Colony Dr. CC13 Quincy, MA 02169-0938	73.84 %
Goldman Sachs & Co LLC Special Custody Account for the Exclusive Benefit of Customers of GS&CO (Customers of Citi) R Dr. Ste 500 Chicago, IL 60606-4673	25.22 %

Name and Address	Percentage
State Street Institutional Liquid Reserves Government Money Market Fund – Trust Class GFAS Control Acct Mt01 State Street Bank PO Box 1992 Quincy, MA 02171	62.44 %
MSCS Financial Services, LLC SEI Private Trust Company C/O Newport Trust, Attn: Mutual Fund Administrator One Freedom Valley Drive Oaks, PA 19456-9989	37.56 %
State Street Institutional Liquid Reserves Government Money Market Fund – Opportunity Class Goldman Sachs & Co LLC Special Custody Account for the Exclusive Benefit of Customers of GS&CO (Customers of Citi) 71 S Wacker Dr. Ste 500 Chicago, IL 60606-4673	53.73 %
State Street Bank & Trust FBO Cash Sweep Clients Attn : Cash Sweep Sup - Rick Letham 1200 Crown Colony Dr. CC13 Quincy, MA 02169-0938	43.37 %
State Street Institutional Treasury Money Market Fund – Premier Class State Street Bank & Trust FBO Cash Sweep Clients Attn : Cash Sweep Sup - Rick Letham 1200 Crown Colony Dr. CC13 Quincy, MA 02169-0938	50.22 %
State Street Institutional Treasury Money Market Fund – Investment Class MSCS Financial Services, LLC Zions First National Bank PO BOX 30880 Salt Lake City, UT 84130-0880	82.11 %
State Street Institutional Treasury Money Market Fund – Institutional Class Bank Of New York Mellon Hare & Co 2 Attn: STIF Operations P.O. Box 223910 Pittsburgh, PA 12521-2910	42.69 %
State Street Institutional Treasury Money Market Fund – Investor Class State Street Bank & Trust FBO Cash Sweep Clients Attn : Cash Sweep Sup - Rick Letham 1200 Crown Colony Dr. CC13 Quincy, MA 02169-0938	88.66 %
State Street Institutional Treasury Money Market Fund – Administration Class Citibank NA 480 Washington Blvd Jersey City, NJ 07310-2053	99.90 %
State Street Institutional Treasury Money Market Fund – Opportunity Class Bofa Securities Inc Bofa Securities Inc For The Sole Benefit Of Its Customers 100 N TRYON St 34th FL Charlotte, NC 28202-4000	59.98 %
Goldman Sachs & Co LLC Special Custody Account for the Exclusive Benefit of Customers of GS&CO (Customers of Citi) R Dr. Ste 500 Chicago, IL 60606-4673	39.69 %
State Street Institutional Treasury Plus Money Market Fund – Premier Class State Street Bank & Trust FBO Cash Sweep Clients Attn : Cash Sweep Sup - Rick Letham 1200 Crown Colony Dr. CC13 Quincy, MA 02169-0938	34.99 %
State Street Institutional Treasury Plus Money Market Fund – Investment Class SSB-WMS State Street Bank And Trust Co As Cust FBO FNZ TR CO Clients PO BOX 5082 Boston, MA 02206-5082	75.52 %

Name and Address	Percentage
State Street Institutional Treasury Plus Money Market Fund – Institutional Class Bank Of New York Mellon Hare & Co 2 Attn: STIF Operations P.O. Box 223910 Pittsburgh, PA 12521-2910	40.12 %
State Street Institutional Treasury Plus Money Market Fund – Investor Class State Street Bank & Trust FBO Cash Sweep Clients Attn : Cash Sweep Sup - Rick Letham 1200 Crown Colony Dr. CC13 Quincy, MA 02169-0938	92.12 %
State Street Institutional Treasury Plus Money Market Fund – Administration Class MSCS Financial Services, LLC Millennium Trust Co LLC FBO Various Beneficiaries 2001 Spring Road, Suite 700 Oak Brook, IL 60523-1890	80.49 %
State Street Institutional Treasury Plus Money Market Fund – Opportunity Class Goldman Sachs & Co LLC Special Custody Account for the Exclusive Benefit of Customers of GS&CO (Customers of Citi) 71 S Wacker Dr Ste 500 Chicago, IL 60606-4673	77.21 %
State Street Institutional U.S. Government Money Market Fund – Premier Class State Street Bank & Trust FBO Cash Sweep Clients Attn : Cash Sweep Sup - Rick Letham 1200 Crown Colony Dr. CC13 Quincy, MA 02169-0938	30.41 %
State Street Institutional U.S. Government Money Market Fund – Investment Class SSB-WMS State Street Bank And Trust Co As Cust FBO FNZ TR CO Clients PO BOX 5082 Boston, MA 02206-5082	95.39 %
State Street Institutional U.S. Government Money Market Fund – Select Class Pershing LLC, Mutual Fund Operations FBO Project National 95 Christopher Columbus Dr. Jersey City, NJ 07302-2978	96.32 %
State Street Institutional U.S. Government Money Market Fund – Investor Class State Street Bank & Trust FBO Cash Sweep Clients Attn : Cash Sweep Sup - Rick Letham 1200 Crown Colony Dr. CC13 Quincy, MA 02169-0938	78.15 %
State Street Institutional U.S. Government Money Market Fund – Class G State Street Bank & Trust FBO Cash Sweep Clients Attn : Cash Sweep Sup - Rick Letham 1200 Crown Colony Dr. CC13 Quincy, MA 02169-0938	97.18 %
State Street Treasury Obligations Money Market Fund State Street Bank & Trust FBO Cash Sweep Clients Attn : Cash Sweep Sup - Rick Letham 1200 Crown Colony Dr. CC13 Quincy, MA 02169-0938	99.99 %

As of March 31, 2025, to the knowledge of the Trust, the following persons held of record or beneficially through one or more accounts 5% or more of the outstanding shares of a class of a Fund.

Name and Address	Percentage
State Street Institutional Liquid Reserves Government Money Market Fund – Premier Class State Street Bank & Trust FBO Cash Sweep Clients Attn : Cash Sweep Sup - Rick Letham 1200 Crown Colony Dr. CC13 Quincy, MA 02169-0938	46.02 %

Name and Address	Percentage
State Street Bank & Trust FBO SSGA Pooled Investments Attn : Cash Sweep Sup 1200 Crown Colony Dr. CC13 Quincy, MA 02169-0938	37.64 %
State Street Institutional Liquid Reserves Government Money Market Fund – Investment Class Mass Abrop & Co, State Treasurer & Receiver General, Abandoned Property Division 1 Ashburton Place Boston, MA 02108-1518	100 %
State Street Institutional Liquid Reserves Government Money Market Fund – Institutional Class Phoebe Putney Health System Inc Po Box 3770 Albany, GA 31706-3770	43.65 %
Morgan Stanley Smith Barney LLC For the Exclusive Benefit of Customers of MSSB 1 New York Plz, FL 12TH New York, NY 10004-1965	36.64 %
SSGM-Fund Connect Astignes Asia Rates Compass Fund Ltd Cayman Islands PO BOX 309 Ugland House Grand Cayman KY1-1104 Cayman Islands	17.50 %
State Street Institutional Liquid Reserves Government Money Market Fund – Investor Class State Street Bank & Trust FBO Cash Sweep Clients Attn : Cash Sweep Sup - Rick Letham 1200 Crown Colony Dr. CC13 Quincy, MA 02169-0938	73.84 %
Goldman Sachs & Co LLC Special Custody Account for the Exclusive Benefit of Customers of GS&CO (Customers of Citi) R Dr. Ste 500 Chicago, IL 60606-4673	25.22 %
State Street Institutional Liquid Reserves Government Money Market Fund – Administration Class SSBT – Cash Sweep Mathworks Inc Wal3 3 Apple Hill Dr. Natick, MA 01760-2098	16.33 %
SSBT – Cash Sweep Sscsil Mer Inv Fd 1 Concise Mjdp 1776 Heritage Dr. Quincy, MA 02171-2119	10.23 %
SSBT- Cash Sweep Seven Seas Fund G6W3 661 RT 183 & Van Reed Road Reading, PA 19612	7.19 %
Phoebe Putney Memorial Hospital, IVX1 417 Third Ave. Albany, GA 31702	5.99 %
SSBT – Cash Sweep Rapides Foundation 1101 4TH St. Alexandria, LA 71301-8309	5.81 %
SSBT – Cash Sweep Stowers Investor Pool/SRRA 1000 E. 50th St. Kansas City, MO 64110-2262	5.55 %
SSBT – Cash Sweep Alternatives/ZKYW 1200 Memorial Dr Dalton, GA 30720-2529	5.42 %
State Street Institutional Liquid Reserves Government Money Market Fund – Trust Class GFAS Control Acct Mt01 State Street Bank PO Box 1992 Quincy, MA 02171	62.44 %

Name and Address	Percentage
MSCS Financial Services, LLC SEI Private Trust Company C/O Newport Trust, Attn: Mutual Fund Administrator One Freedom Valley Drive Oaks, PA 19456-9989	37.56 %
State Street Institutional Liquid Reserves Government Money Market Fund – Opportunity Class Goldman Sachs & Co LLC Special Custody Account for the Exclusive Benefit of Customers of GS&CO (Customers of Citi) 71 S Wacker Dr. Ste 500 Chicago, IL 60606-4673	53.73 %
State Street Bank & Trust FBO Cash Sweep Clients Attn : Cash Sweep Sup - Rick Letham 1200 Crown Colony Dr. CC13 Quincy, MA 02169-0938	43.37 %
State Street Institutional Treasury Money Market Fund – Premier Class State Street Bank & Trust FBO Cash Sweep Clients Attn : Cash Sweep Sup - Rick Letham 1200 Crown Colony Dr. CC13 Quincy, MA 02169-0938	50.22 %
Bofa Securities Inc Bofa Securities Inc For The Sole Benefit Of Its Customers 100 N TRYON St 34th FL Charlotte, NC 28202-4000	21.56 %
State Street Institutional Treasury Money Market Fund – Investment Class MSCS Financial Services, LLC Zions First National Bank PO BOX 30880 Salt Lake City, UT 84130-0880	82.11 %
SSB-WMS State Street Bank And Trust Co As Cust FBO FNZ TR CO Clients PO BOX 5082 Boston, MA 02206-5082	16.18 %
State Street Institutional Treasury Money Market Fund – Institutional Class Bank Of New York Mellon Hare & Co 2 Attn: STIF Operations P.O. Box 223910 Pittsburgh, PA 12521-2910	42.69 %
Bank Of New York Mellon Hare & Co 2 Attn: STIF Operations P.O. Box 223910 Pittsburgh, PA 12521-2910	19.84 %
JPMorgan Chase Bank NA JPMS - Chase Processing 28521 JPMS IB 352, 4 Chase Metrotech Center 7th Fl. Brooklyn, NY 11245-0003	14.42 %
Morgan Stanley Smith Barney LLC For the Exclusive Benefit of Customers of MSSB 1 New York Plz, FL 12TH New York, NY 10004-1965	11.96 %
PNC Capital Markets LLC The PNC Financial Services Group Inc 249 5TH Ave MSC PI-POPP-11-A Pittsburgh, PA 15222	6.92 %
State Street Institutional Treasury Money Market Fund – Investor Class State Street Bank & Trust FBO Cash Sweep Clients Attn : Cash Sweep Sup - Rick Letham 1200 Crown Colony Dr. CC13 Quincy, MA 02169-0938	88.66 %
SSGM-Fund Connect Arrowood Indemnity Company (A Delaware Corporation) 3600 Arco Corporate Dr Charlotte, NC 28273-8100	7.17 %

Name and Address	Percentage
State Street Institutional Treasury Money Market Fund – Administration Class Citibank NA 480 Washington Blvd Jersey City, NJ 07310-2053	99.90 %
State Street Institutional Treasury Money Market Fund – Opportunity Class Bofa Securities Inc Bofa Securities Inc For The Sole Benefit Of Its Customers 100 N TRYON St 34th FL Charlotte, NC 28202-4000	59.98 %
Goldman Sachs & Co LLC Special Custody Account for the Exclusive Benefit of Customers of GS&CO (Customers of Citi) R Dr. Ste 500 Chicago, IL 60606-4673	39.69 %
State Street Institutional Treasury Plus Money Market Fund – Premier Class State Street Bank & Trust FBO Cash Sweep Clients Attn : Cash Sweep Sup - Rick Letham 1200 Crown Colony Dr. CC13 Quincy, MA 02169-0938	34.99 %
Goldman Sachs & CO LLC GS Global Cash Services, Omnibus Account for the Benefit of Goldman Sachs & Co LLC Customers 71 S Wacker DR STE 500 Chicago, IL 60606-4673	9.07 %
SSGM-Fund Connect State Street Global Markets LLC Attn Gregory Fortuna 1 Lincoln St # Sfc-6 Boston, MA 02111-2900	8.54 %
Bank Of New York Mellon Hare & Co 2 Attn: STIF Operations P.O. Box 223910 Pittsburgh, PA 12521-2910	7.00 %
Bofa Securities Inc Bofa Securities Inc For The Sole Benefit Of Its Customers 100 N TRYON St 34th FL Charlotte, NC 28202-4000	6.81 %
State Street Institutional Treasury Plus Money Market Fund – Investment Class SSB-WMS State Street Bank And Trust Co As Cust FBO FNZ TR CO Clients PO BOX 5082 Boston, MA 02206-5082	75.52 %
Charles Schwab & Co Inc, Special Cust A/C FBO our Customers Attn: Mutual Funds 211 Main St. San Francisco, CA 94105-1901	24.48 %
State Street Institutional Treasury Plus Money Market Fund – Institutional Class Bank Of New York Mellon Hare & Co 2 Attn: STIF Operations P.O. Box 223910 Pittsburgh, PA 12521-2910	40.12 %
Chicago Mercantile Exchange Inc Cleared Swaps Customer Account Attn: Clearing Financial Unit 20 S Wacker Dr. Chicago, IL 60606-7431	13.06 %
Chicago Mercantile Exchange Inc CFTC 1.26 Futures Customer Segregated Omnibus Account Attn Mike Kobida 20 S Wacker Dr. Chicago, IL 60606-7431	9.33 %

Name and Address	Percentage
Morgan Stanley Smith Barney LLC For the Exclusive Benefit of Customers of MSSB 1 New York Plz, FL 12TH New York, NY 10004-1965	8.41 %
JPMorgan Chase Bank NA JPMS - Chase Processing 28521 JPMS IB 352, 4 Chase Metrotech Center 7th Fl. Brooklyn, NY 11245-0003	6.34 %
State Street Institutional Treasury Plus Money Market Fund – Investor Class State Street Bank & Trust FBO Cash Sweep Clients Attn : Cash Sweep Sup - Rick Letham 1200 Crown Colony Dr. CC13 Quincy, MA 02169-0938	92.12 %
State Street Institutional Treasury Plus Money Market Fund – Administration Class MSCS Financial Services, LLC Millennium Trust Co LLC FBO Various Beneficiaries 2001 Spring Road, Suite 700 Oak Brook, IL 60523-1890	80.49 %
Citibank NA Citibank, NA FBO 13484500 Canaras Liquid Asset Strategies Fund LLC Principal Collection Account 480 Washington Blvd Jersey City, NJ 07310-2053	11.41 %
State Street Institutional Treasury Plus Money Market Fund – Opportunity Class Goldman Sachs & Co LLC Special Custody Account for the Exclusive Benefit of Customers of GS&CO (Customers of Citi) 71 S Wacker Dr Ste 500 Chicago, IL 60606-4673	77.21 %
State Street Bank & Trust FBO Cash Sweep Clients Attn : Cash Sweep Sup - Rick Letham 1200 Crown Colony Dr. CC13 Quincy, MA 02169-0938	20.57 %
State Street Institutional U.S. Government Money Market Fund – Premier Class State Street Bank & Trust FBO Cash Sweep Clients Attn : Cash Sweep Sup - Rick Letham 1200 Crown Colony Dr. CC13 Quincy, MA 02169-0938	30.41 %
Goldman Sachs & CO LLC GS Global Cash Services, Omnibus Account for the Benefit of Goldman Sachs & Co LLC Customers 71 S Wacker DR STE 500 Chicago, IL 60606-4673	8.51 %
Bofa Securities Inc Bofa Securities Inc For The Sole Benefit Of Its Customers 100 N TRYON St 34th FL Charlotte, NC 28202-4000	8.13 %
Wells Fargo Bank, NA Exclusive Benefit of the Customers, Attn Money Funds 1525 W W T Harris Blvd Floor 1st, MAC D1109-010 Charlotte, NC 28262-8522	5.44 %
JPMorgan Chase Bank NA JPMS - Chase Processing 28521 JPMS IB 352 FBO 0215176421 Facebook, INC. 4 Chase Metrotech Ctr Fl 7th Brooklyn, NY 11245-0003	5.24 %
State Street Institutional U.S. Government Money Market Fund – Investment Class SSB-WMS State Street Bank And Trust Co As Cust FBO FNZ TR CO Clients PO BOX 5082 Boston, MA 02206-5082	95.39 %

Name and Address	Percentage
State Street Institutional U.S. Government Money Market Fund – Select Class Pershing LLC, Mutual Fund Operations FBO Project National 95 Christopher Columbus Dr. Jersey City, NJ 07302-2978	96.32 %
State Street Institutional U.S. Government Money Market Fund – Institutional Class Bank Of New York Mellon Hare & Co 2 Attn: STIF Operations P.O. Box 223910 Pittsburgh, PA 12521-2910	24.77 %
Bank Of New York Mellon Hare & Co 2 Attn: STIF Operations P.O. Box 223910 Pittsburgh, PA 12521-2910	14.97 %
PNC Capital Markets LLC The PNC Financial Services Group Inc 249 5TH Ave MSC PI-POPP-11-A Pittsburgh, PA 15222	9.47 %
Chicago Mercantile Exchange Inc Cleared Swaps Customer Account Attn: Clearing Financial Unit 20 S Wacker Dr. Chicago, IL 60606-7431	6.45 %
Chicago Mercantile Exchange Inc CFTC 1.26 Futures Customer Segregated Omnibus Account Attn Mike Kobida 20 S Wacker Dr. Chicago, IL 60606-7431	5.71 %
State Street Institutional U.S. Government Money Market Fund – Investor Class State Street Bank & Trust FBO Cash Sweep Clients Attn : Cash Sweep Sup - Rick Letham 1200 Crown Colony Dr. CC13 Quincy, MA 02169-0938	78.15 %
State Street Institutional U.S. Government Money Market Fund – Class G State Street Bank & Trust FBO Cash Sweep Clients Attn : Cash Sweep Sup - Rick Letham 1200 Crown Colony Dr. CC13 Quincy, MA 02169-0938	97.18 %
State Street Institutional U.S. Government Money Market Fund – Administration Class Citibank NA FBO 14265900 BMIF Collection AC 480 Washington BLVD Jersey City, NJ 07310-2053	8.48 %
Citibank NA, FBO 13392100 Metronet Infrastructure Issuer 2022-1 Liquidity Reserve Account 480 Washington Blvd Fl. 30 Jersey City, NJ 07310-2053	8.20 %
SSBT- Cash Sweep The INTL/Y81R 1776 Heritage Dr. Quincy, MA 02171-2119	5.15 %
State Street Institutional U.S. Government Money Market Fund – Opportunity Class Bank Of New York Mellon Hare & Co 2 Attn: STIF Operations P.O. Box 223910 Pittsburgh, PA 12521-2910	22.94 %
State Street Bank & Trust FBO Cash Sweep Clients Attn : Cash Sweep Sup - Rick Letham 1200 Crown Colony Dr. CC13 Quincy, MA 02169-0938	20.84 %

Name and Address	Percentage
JPMorgan Chase Bank NA JPMS - Chase Processing 28521 JPMS IB 352 FBO Alphabet Capital Us LLC 4 Chase Metrotech Ctr Fl 7th Brooklyn, NY 11245-0003	17.19 %
City and County of San Francisco 1 Carlton B Goodlett Pl. Ste. 140 San Francisco, CA 94102-4626	9.46 %
Goldman Sachs & Co LLC Special Custody Account for the Exclusive Benefit of Customers of GS&CO (Customers of Citi) 71 S Wacker Dr. Ste 500 Chicago, IL 60606-4673	6.97 %
JPMorgan Chase Bank NA JPMS - Chase Processing 28521 JPMS IB 352 FBO American Honda Motor 4 Chase Metrotech Ctr Fl 7th Brooklyn, NY 11245-0003	6.10 %
US Bank NA Band & Co C/O US Bank NA PO BOX 1787 Milwaukee, WI 53201-1787	5.72 %
State Street Treasury Obligations Money Market Fund State Street Bank & Trust FBO Cash Sweep Clients Attn : Cash Sweep Sup - Rick Letham 1200 Crown Colony Dr. CC13 Quincy, MA 02169-0938	99.99 %

INVESTMENT ADVISORY AND OTHER SERVICES

Investment Advisory Agreement

The Adviser is responsible for the investment management of the Funds pursuant to the Amended and Restated Investment Advisory Agreement dated November 17, 2015 as amended from time to time (the “Advisory Agreement”), by and between the Adviser and the Trust. The Adviser is a wholly-owned subsidiary of State Street Global Advisors, Inc., which itself is a wholly-owned subsidiary of State Street Corporation, a publicly held financial holding company. State Street is a wholly-owned subsidiary of State Street Corporation.

The Advisory Agreement will continue from year to year provided that such continuance is specifically approved at least annually by (a) the Trustees or by the vote of a majority of the outstanding voting securities of a Fund, and (b) vote of a majority of the Independent Trustees, cast in person at a meeting called for the purpose of voting on such approval. The Advisory Agreement may be terminated by the Adviser or the Trust without penalty upon sixty days' notice and will terminate automatically upon its assignment. The Adviser and its affiliates may have deposit, loan and other commercial banking relationships with the issuers of obligations that may be purchased on behalf of the Funds, including outstanding loans to such issuers that could be repaid in whole or in part with the proceeds of securities so purchased. Such affiliates deal, trade and invest for their own accounts in such obligations and are among the leading dealers of various types of such obligations. The Adviser has informed the Funds that, in making its investment decisions, it will not obtain or use material non-public information in its possession or in the possession of any of its affiliates. In making investment recommendations for a Fund, the Adviser will not inquire or take into consideration whether an issuer of securities proposed for purchase or sale by the Fund is a customer of the Adviser, its parent or its subsidiaries or affiliates and, in dealing with its customers, the Adviser, its parent, subsidiaries and affiliates will not inquire or take into consideration whether securities of such customers were held by any fund managed by the Adviser or any such affiliate.

In certain instances, there may be securities that are suitable for a Fund as well as for one or more of the Adviser's other clients.

Investment decisions for the Trust and for the Adviser's other clients are made with a view to achieving their respective investment objectives. It may develop that a particular security is bought or sold for only one client even though it might be held by, or bought or sold for, other clients. Likewise, a particular security may be bought for one or more clients when one or more clients are selling that same security. Some simultaneous transactions are inevitable when several clients receive investment advice from the same investment adviser, particularly when the same security is suitable for the investment objectives of more than one client. When two or more clients are simultaneously engaged in the purchase or sale of the

same security, the securities are allocated among clients in a manner believed to be equitable to each. The Trust recognizes that in some cases this system could have a detrimental effect on the price or volume of the security as far as a Fund is concerned. However, it is believed that the ability of each Fund to participate in volume transactions will produce better executions for the Funds.

Each Fund currently invests all of its assets in a related Portfolio that has the same investment objectives and substantially the same investment policies as the relevant Fund. As long as a Fund remains completely invested in its related Portfolio (or any other investment company), the Adviser is not entitled to receive any investment advisory fee with respect to the Fund. A Fund may withdraw its investment from the related Portfolio at any time. The Trust has retained the Adviser as investment adviser to manage a Fund's assets in the event that the Fund withdraws its investment from its related Portfolio.

The Adviser is also the investment adviser to each of the related Portfolios pursuant to an investment advisory agreement (the “Portfolio Advisory Agreement”) between the Adviser and State Street Master Funds, on behalf of the Portfolios. The Adviser receives an investment advisory fee with respect to each related Portfolio. The Portfolio Advisory Agreement is the same in all material respects as the Advisory Agreement between the Trust on behalf of the Funds and the Adviser. Each Fund that invests in a related Portfolio bears a proportionate part of the management fees paid by the Portfolio (based on the percentage of the Portfolio's assets attributable to the Fund).

For the services provided under the Advisory Agreement and the Portfolio Advisory Agreement, each Fund pays the Adviser a fee at an annual rate set forth below of the Fund's average daily net assets.

Fund	Fee Rate
ILR Government Fund	0.05 %
Treasury Fund	0.05 %
Treasury Plus Fund	0.05 %
U.S. Government Fund	0.05 %
Treasury Obligations Fund	0.05 %

The advisory fees paid by the Portfolios to SSGA FM for the last three fiscal years ended December 31 are as follows.

Portfolio	2024	2023	2022
Money Market Portfolio	$7,254,571	$6,587,155	$6,327,552
Treasury Portfolio	$6,555,416	$6,349,102	$7,513,540
Treasury Plus Portfolio	$24,905,996	$18,610,840	$19,365,971
U.S. Government Portfolio	$77,476,250	$53,561,767	$49,076,090

From time to time, the Adviser may contractually agree to waive the advisory fee and/or reimburse certain Fund expenses in excess of a certain percentage of average daily net assets on an annual basis (an “expense limitation”). The amount of advisory fees waived and/or reimbursed during the past fiscal year is shown below.

Fund	2024
ILR Government Fund	$77
Treasury Fund	$0
Treasury Plus Fund	$0
U.S. Government Fund	$33,857
Treasury Obligations Fund	$1,635,036

Total Annual Fund Operating Expense Waivers and Reimbursements. The Adviser has contractually agreed with the Trust through April 30, 2026, to waive up to the full amount of the advisory fee payable by the ILR Government Fund, the Treasury Money Market Fund, the Treasury Plus Fund and the U.S. Government Fund and/or reimburse a Fund for expenses to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, extraordinary expenses, acquired fund fees, any class-specific expenses such as distribution, shareholder servicing, sub-transfer agency and administration fees) exceed the following percentage of average daily net assets on an annual basis:

Fund	Expense Limitation	Expiration Date
ILR Government Fund	0.07 %	4/30/2026
Treasury Fund	0.07 %	4/30/2026

Fund	Expense Limitation	Expiration Date
Treasury Plus Fund	0.07 %	4/30/2026
U.S. Government Fund	0.07 %	4/30/2026

With respect to the Treasury Obligations Money Market Fund, the Adviser has contractually agreed with the Trust through April 30, 2026, to waive up to the full amount of the advisory fee payable by the Treasury Obligations Money Market Fund and/or reimburse the Fund for expenses to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, and extraordinary expenses) exceed 0.10% of the Fund's average daily net assets on an annual basis.

Voluntary Expense Waivers. The Adviser has voluntarily agreed to waive its advisory fee and/or to reimburse the Treasury Obligations Fund for expenses to the extent that the Fund's total annual operating expenses exceed 0.08% of average daily net assets on an annual basis (each a “Voluntary Expense Waiver”). The Adviser may discontinue either Voluntary Expense Waiver at any time, in its sole discretion. For the period ended December 31, 2024, the Adviser voluntarily waived expenses in the amount of $887,909.36 for the Treasury Obligations Fund.

Voluntary Yield Waivers. For each Money Market Fund, each of SSGA FM and SSGA FD (each a “Service Provider”) may voluntarily reduce all or a portion of its fees and/or reimburse expenses for a fund or a share class to the extent necessary to maintain a certain minimum net yield, which may vary from time to time in SSGA FM's sole discretion (any such waiver or reimbursement of expenses being referred to herein as a “Voluntary Reduction”). The Adviser may, in its sole discretion, implement the Voluntary Reduction for some Funds, or some share classes of a Fund, and not others. The amount of any Voluntary Reduction may differ between Funds and share classes in the Adviser's sole discretion. The business objectives of the Adviser and its affiliates and their broader relationships with certain Fund shareholders, Financial Intermediaries or distribution channels could give the Adviser an incentive to implement the Voluntary Reduction for some Funds or share classes and not others, or to implement it to a greater degree for some Funds or share classes than others. Under an agreement with the Service Providers relating to the Voluntary Reduction, the Funds and the Portfolios have agreed to reimburse the Service Providers for the full dollar amount of any Voluntary Reduction beginning on May 1, 2020, subject to certain limitations. Each Service Provider may, in its sole discretion, irrevocably waive receipt of any or all reimbursement amounts due from a Fund, without limitation. Fees reduced or expenses reimbursed by the Service Providers in connection with the Voluntary Reduction for the period ended December 31, 2024 were $0 for the ILR Government Fund, $0 for the Treasury Fund, $0 for the Treasury Plus Fund, $0 for the U.S. Government Fund, and $0 for the Treasury Obligations Fund.

Administrator

SSGA FM serves as the administrator for the Funds pursuant to an Amended and Restated Administration Agreement dated June 1, 2015. Under the Amended and Restated Administration Agreement, SSGA FM is obligated to continuously provide business management services to the Trust and each Fund and will generally, subject to the general oversight of the Trustees and except as otherwise provided in the Amended and Restated Administration Agreement, manage all of the business and affairs of the Trust. The nature and amount of services provided by SSGA FM under the Amended and Restated Administration Agreement may vary as between classes of shares of a Fund, and a Fund may pay fees to SSGA FM under that Agreement at different rates in respect of its different share classes. Except as noted below, as consideration for SSGA FM's services as administrator to each Fund, SSGA FM receives an annual fee of 0.05% of the average daily net assets of such Fund, accrued daily at the rate of 1/365th and payable monthly on the first business day of each month. As consideration for SSGA FM's services as administrator to Class G shares of the U.S. Government Fund, SSGA FM receives an annual fee of 0.01% of the average daily net assets of such class, accrued daily at the rate of 1/365th and payable monthly on the first business day of each month. The Funds reimburse SSGA FM for certain out-of-pocket travel expenses of the CCO and compliance team incurred on the Funds' behalf.

The administration fees paid to SSGA FM for the last three fiscal years are set forth in the table below.

Fund	2024	2023	2022
ILR Government Fund	$7,253,741	$6,587,346	$6,326,522
Treasury Fund	$6,225,358	$6,011,471	$7,173,918
Treasury Plus Fund	$22,687,073	$16,343,182	$16,624,212
U.S. Government Fund	$74,921,959	$51,454,626	$46,648,264
Treasury Obligations Fund	$2,219,774	$2,267,810	$2,743,013

Sub-Administrator, Custody and Fund Accounting

State Street serves as the sub-administrator for the Trust, pursuant to a sub-administration agreement dated June 1, 2015 (the “Sub-Administration Agreement”). State Street serves as the custodian for the Trust, pursuant to a custody agreement dated April 11, 2012 (the “Custody Agreement”). Under the Sub-Administration Agreement, State Street is obligated to provide certain sub-administrative services to the Trust. Under the Custody Agreement, State Street is obligated to provide certain custody services to the Trust, as well as basic portfolio recordkeeping required by the Trust for regulatory and financial reporting purposes. State Street is a wholly owned subsidiary of State Street Corporation, a publicly held financial holding company, and is affiliated with the Adviser. State Street's mailing address is One Congress Street, Boston, Massachusetts 02114.

As consideration for sub-administration services, State Street receives an annual fee from the Adviser (payable monthly). As consideration for custody and fund accounting services, each Fund pays State Street an annual fee (payable monthly) based on the average monthly net assets of each Fund. Each Fund also pays State Street transaction and service fees for these services and reimburses State Street for out-of-pocket expenses.

The sub-administration, custodian and fund accounting fees paid by the Funds to State Street for the last three fiscal years ended December 31 are set forth in the table below.

Fund	2024	2023	2022
ILR Government Fund	$65,178	$65,864	$71,197
Treasury Fund	$40,475	$40,938	$46,854
Treasury Plus Fund	$47,798	$48,312	$54,922
U.S. Government Fund	$51,509	$50,071	$59,762
Treasury Obligations Fund	$14,258	$14,717	$18,222

Transfer Agent and Dividend Paying Agent

SS&C GIDS, Inc. serves as the Transfer and Dividend Paying Agent. SS&C GIDS, Inc. is paid for the following annual account services and activities including but not limited to: establishment and maintenance of each shareholder's account; closing an account; acceptance and processing of trade orders; preparation and transmission of payments for dividends and distributions declared by each Fund; customer service support including receipt of correspondence and responding to shareholder and financial intermediary inquiries; investigation services; tax related support; financial intermediary fee payment processing; and charges related to compliance and regulatory services.

Portfolio fees are allocated to each Fund based on the average net asset value of each Fund and are billable on a monthly basis at the rate of 1/12 of the annual fee. SS&C GIDS, Inc. is reimbursed by each Fund for supplying certain out-of-pocket expenses including confirmation statements, investor statements, banking fees, postage, forms, audio response, telephone, records retention, customized programming/enhancements, reports, transcripts, microfilm, microfiche, and expenses incurred at the specific direction of the Fund. SS&C GIDS, Inc. principal business address is 2000 Crown Colony Drive, Quincy, MA 02169.

Codes of Ethics

The Trust, the Adviser and SSGA FD have each adopted a code of ethics (together, the “Codes of Ethics”) pursuant to Rule 17j-1 under the 1940 Act as required by applicable law, which is designed to prevent affiliated persons of the Trust, the Adviser and SSGA FD from engaging in deceptive, manipulative or fraudulent activities in connection with securities held or to be acquired by the Funds (which may also be held by persons subject to the Codes of Ethics). The Codes of Ethics permit personnel, subject to the Codes of Ethics and their provisions, to invest in securities for their personal investment accounts, subject to certain limitations, including securities that may be purchased or held by the Trust, Adviser, State Street or SSGA FD.

Distributor

SSGA FD serves as the distributor of the Funds pursuant to the Distribution Agreement by and between SSGA FD and the Trust. Pursuant to the Distribution Agreement, the Funds, except for the Treasury Obligations Fund, pay SSGA FD fees under the Rule 12b-1 Plan in effect for the Funds. For a description of the fees paid to SSGA FD under the Rule 12b-1 Plan, see “Distribution Plans,” below. SSGA FD is an indirect wholly-owned subsidiary of State Street Corporation. SSGA FD's mailing address is One Iron Street, Boston, MA 02210.

Distribution Plans

To compensate SSGA FD for the services it provides and for the expenses it bears in connection with the distribution of shares of the Funds, SSGA FD will be entitled to receive any front-end sales load applicable to the sale of shares of the Fund. Each Fund, except for the Treasury Obligations Fund, may make payments (“Rule 12b-1 Fees”) from the assets attributable to certain classes of its shares to SSGA FD under a distribution plan adopted pursuant to Rule 12b-1 under the 1940 Act (the “Distribution Plan”). The Distribution Plan is a compensation plan that provides for payments at annual rates (based on average daily net assets) set out below. Because Rule 12b-1 Fees are paid on an ongoing basis, they will increase the cost of your investment and may cost you more than paying other types of sales loads. The principal business address of SSGA FD is One Iron Street, Boston, MA 02210.

The Board, including all of the Trustees who are not interested persons (as defined in the 1940 Act) of the Trust (the “Independent Trustees”) and who have no direct or indirect financial interest in the Distribution Plan or any related agreements, (the “Qualified Distribution Plan Trustees”) approved the Distribution Plan. The Distribution Plan will continue in effect with respect to a class of shares of a Fund only if such continuance is specifically approved at least annually by a vote of both a majority of the Board of Trustees of the Trust and a majority of the Qualified Distribution Plan Trustees. The Distribution Plan may not be amended to increase materially the amount of a Fund's permitted expenses thereunder without the approval of a majority of the outstanding shares of the affected share class and may not be materially amended in any case without a vote of the majority of both the Trustees and the Qualified Distribution Plan Trustees. As of December 31, 2024, none of the Independent Trustees had a direct or indirect financial interest in the operation of the Distribution Plan. The Distribution Plan calls for payments at an annual rate (based on each Fund's average net assets) as follows:

Premier Class	0.00 %
Select Class*	0.00 %
Investment Class	0.10 %
Institutional Class	0.00 %
Investor Class	0.00 %
Administration Class	0.05 %
Class G†	0.00 %
Trust Class††	0.00 %
Opportunity Class	0.00 %

U.S. Government Fund, Treasury Fund and Treasury Plus Fund only.

†

U.S. Government Fund only.

††

ILR Government Fund, Treasury Plus Fund and U.S. Government Fund only.

For the fiscal year ended December 31, 2024, the total Rule 12b-1 fees retained by SSGA FD and the total Rule 12b-1 fees paid by SSGA FD to intermediaries out of payments it receives from the Funds under the Rule 12b-1 Distribution Plan are reflected in the chart below.

Fund	Rule 12b-1 Fees Retained by SSGA FD(1)	Rule 12b-1 Fees Paid by SSGA FD to Intermediaries
ILR Government Fund
Investment Class	$7	$-
Administration Class	$1,027	$145,131
Treasury Fund
Investment Class	$277,018	$148,964
Administration Class	$788	$52,590
Treasury Plus Fund
Investment Class	$2,018	$9,878
Administration Class	$26	$1,422
U.S. Government Fund
Investment Class	$9,118	$232,444
Administration Class	$(32,169 )	$989,247

(1)

Amounts shown are net of payments made by SSGA FD to other intermediaries.

The Distribution Plan may benefit the Funds by increasing sales of shares and reducing redemptions of shares, resulting potentially, for example, in economies of scale and more predictable flows of cash into and out of the Funds. Because Rule 12b-1 fees are paid out of a Fund's assets, all shareholders share in that expense; however, because shareholders hold their shares through varying arrangements (for example, directly or through financial intermediaries), they may not share equally in the benefits of the Distribution Plan.

Shareholder Servicing Agent

SSGA FD serves as a shareholder servicing agent of the ILR Government Fund, the Treasury Fund, the Treasury Plus Fund and the U.S. Government Fund, pursuant to a Shareholder Servicing Agreement between SSGA FD and the Trust (the “Shareholder Servicing Agreement”). Pursuant to the Shareholder Servicing Agreement, SSGA FD provides or arranges for the provision of various administrative, sub-accounting and personal services to investors in the Institutional Class, Trust Class, Investor Class, Administration Class, Investment Class and Opportunity Class shares of such Funds. Services provided by SSGA FD or that SSGA FD arranges to be provided by a financial intermediary pursuant to the Shareholder Servicing Agreement include, among other things: establishing and maintaining shareholder account registrations; sub-accounting with respect to shares held in omnibus accounts; receiving and processing purchase and redemption orders, including aggregated orders, and delivering orders to the Fund's transfer agent; processing and delivering trade confirmations, periodic statements, prospectuses, annual reports, semi-annual reports, shareholder notices, and other SEC-required communications; processing dividend and distribution payments and issuing related documentation; providing shareholder tax reporting and processing tax data; receiving, tabulating, and transmitting proxies for proxy solicitations; and responding to inquiries from shareholders. Shareholder servicing fees paid for the last fiscal year included amounts paid to affiliates of the Adviser and SSGA FD including State Street Bank (on behalf of all of its North America business units) and State Street Global Markets, LLC and Global Services divisions of State Street Bank and Trust Company. These affiliates of the Adviser are also among the financial intermediaries that may receive fees from the Distribution Plan.

The Shareholder Servicing Agreement calls for payments by the ILR Government Fund, Treasury Fund, Treasury Plus Fund and U.S. Government Fund at an annual rate (based on average net assets) as follows:

Premier Class	None
Institutional Class	0.03 %
Trust Class (Treasury Plus Fund)	0.056 %
Trust Class (ILR Government Fund)	0.058 %
Investor Class	0.08 %
Administration Class	0.20 %
Investment Class	0.25 %
Opportunity Class	0.03 %

The payments made for shareholder servicing pursuant to the Shareholder Servicing Agreement from the effective date of the agreement, as well as payments made pursuant to a prior arrangement between the Funds and SSGA FD, by the ILR Government Fund, the Treasury Fund, the Treasury Plus Fund and the U.S. Government Fund for the last three fiscal years ended December 31 are reflected in the chart below:

Fund	2024	2023	2022
ILR Government Fund	$1,156,554	$1,154,890	$1,702,049
Treasury Fund	$1,990,175	$1,460,106	$1,951,793
Treasury Plus Fund	$6,418,265	$4,635,597	$4,245,884
U.S. Government Fund	$13,189,525	$10,608,325	$8,772,210

Payments to Financial Intermediaries

Financial intermediaries are firms that sell shares of mutual funds, including the Funds, and/or provide certain administrative and account maintenance services to mutual fund shareholders. Financial intermediaries may include, among others, brokers, financial planners or advisors, banks, retirement plan recordkeepers, and insurance companies. In some cases, a financial intermediary may hold its clients' Fund shares in nominee or street name and may utilize omnibus accounts. Shareholder services provided by a financial intermediary may (though they will not necessarily) include, among other things: establishing and maintaining shareholder account registrations; sub-accounting with respect to shares held in omnibus accounts; receiving and processing purchase and redemption orders, including aggregated orders, and delivering orders to the Fund's transfer agent; processing and delivering trade confirmations, periodic statements, prospectuses,

annual reports, semi-annual reports, shareholder notices, and other SEC-required communications; processing dividend and distribution payments and issuing related documentation; providing shareholder tax reporting and processing tax data; receiving, tabulating, and transmitting proxies for proxy solicitations; and responding to inquiries from shareholders.

Some portion of SSGA FD's payments to financial intermediaries will be made out of amounts received by SSGA FD under the Distribution Plans and pursuant to the Shareholder Servicing Agreement. In addition, the Funds may reimburse SSGA FD for payments SSGA FD makes to financial intermediaries that provide recordkeeping, shareholder servicing, sub-transfer agency, administrative and/or account maintenance services (collectively, “servicing”). The amount of the reimbursement for servicing compensation and the manner in which it is calculated are reviewed by the Trustees periodically.

A financial intermediary is often compensated by SSGA FD or its affiliates for the services the financial intermediary performs and, in such cases, it is typically paid continually over time, during the period when the intermediary's clients hold investments in the Funds. The compensation to financial intermediaries may include networking fees and account-based fees. The amount of continuing compensation paid by SSGA FD to different financial intermediaries varies. In the case of most financial intermediaries, compensation for servicing in excess of any amount covered by payments under a Distribution Plan is generally paid at an annual rate of 0.03% – 0.25% of the aggregate average daily net asset value of Fund shares held by that financial intermediary's customers, although in some cases the compensation may be paid at higher annual rates (which may, but will not necessarily, reflect enhanced or additional services provided by the financial intermediary). The amount paid by a Fund may vary by share class.

If you invest through a Financial Intermediary and meet the eligibility criteria for more than one share class, you should discuss with your Financial Intermediary which share class is appropriate for you. Your financial adviser and the Financial Intermediary employing him or her may have an incentive to recommend one share class over another, when you are eligible to invest in more than one share class. Please speak with your financial adviser to learn more about the total amounts paid to your financial adviser and his or her firm by the Fund or its affiliates with respect to the different share classes offered by the Fund.

SSGA FD and its affiliates (including SSGA FM), at their own expense and out of their own assets, may also provide compensation to financial intermediaries in connection with sales of the Funds' shares or servicing of shareholders or shareholder accounts by financial intermediaries. Such compensation may include, but is not limited to, ongoing payments, financial assistance to financial intermediaries in connection with conferences, sales, or training programs for their employees, seminars for the public, advertising or sales campaigns, or other financial intermediary-sponsored special events. In some instances, this compensation may be made available only to certain financial intermediaries whose representatives have sold or are expected to sell significant amounts of shares. Financial intermediaries may not use sales of the Funds' shares to qualify for this compensation to the extent prohibited by the laws or rules of any state or any self-regulatory agency, such as FINRA. The level of payments made to a financial intermediary in any given year will vary and, in the case of most financial intermediaries, will not exceed 0.05% of the value of assets attributable to the financial intermediary invested in shares of funds in the SSGA FM-fund complex. In certain cases, the payments described in the preceding sentence are subject to minimum payment levels.

If payments to financial intermediaries by the distributor or adviser for a particular mutual fund complex exceed payments by other mutual fund complexes, your financial advisor and the financial intermediary employing him or her may have an incentive to recommend that fund complex over others. Please speak with your financial advisor to learn more about the total amounts paid to your financial advisor and his or her firm by SSGA FD and its affiliates, and by sponsors of other mutual funds he or she may recommend to you. You should also consult disclosures made by your financial intermediary at the time of purchase. Because the Funds pay distribution, service and other fees for the sale of their shares and for services provided to shareholders out of the Funds' assets on an ongoing basis, over time those fees will increase the cost of an investment in a Fund.

A Fund may pay distribution fees, service fees and other amounts described above at a time when shares of the Fund are not being actively promoted to new investors generally, or when shares of that Fund are unavailable for purchase.

For the fiscal year ended December 31, 2024, the Funds have been informed by SSGA FD that the following expenditures were made using the amounts each Fund paid under its 12b-1 Distribution Plan:

Fund	Advertising	Printing	Compensation to Dealers	Compensation to Sales Personnel	Other*
ILR Government Fund	$610	$0	$145,131	$5,882	$17,210

Fund	Advertising	Printing	Compensation to Dealers	Compensation to Sales Personnel	Other*
Treasury Fund	$1,110	$0	$201,554	$10,709	$31,333
Treasury Plus Fund	$31	$0	$11,300	$298	$872
U.S. Government Fund	$4,505	$0	$1,221,691	$43,456	$127,143

Includes such items as compensation for travel, conferences and seminars for staff, professional fees, technology, services, and overhead (including space/facilities and management).

Set forth below is a list of those financial intermediaries to which SSGA FD (and its affiliates) expects, as of April 30, 2025, to pay compensation in the manner described in this “Payments to Financial Intermediaries” section. This list may change over time. Please contact your financial intermediary to determine whether it or its affiliate currently may be receiving such compensation and to obtain further information regarding any such compensation.

•Ariel Distributors Inc.

•Ascensus Broker Dealer Services, LLC

•BMO Capital Markets Corp.

•Blaylock Van, LLC

•BofA Securities, Inc.

•Cabrera Capital Markets LLC

•Charles Schwab & Co., Inc.

•Citibank, N.A.

•Computershare Trust Company, N.A.

•Commerce Bank

•Empower Financial Services, Inc.

•FIS Brokerage & Securities Services LLC

•State Street Brokerage Services, Inc.

•Goldman Sachs & Co

•Institutional Cash Distributors, LLC

•J.P. Morgan Securities LLC

•JP Morgan Chase bank, N.A.

•Lasalle Street Securities

•Mid-Atlantic Capital Corporation

•Morgan Stanley Smith Barney LLC

•MSCS Financial Services LLC

•MUFG Union Bank, National Association

•National Financial Services, LLC

•Pershing LLC

•PNC Capital Markets, LLC

•RBC Capital Markets, LLC

•Securities Finance Trust Company

•SEI Trust Company

•State Street Bank and Trust Company – Global Services Business Units

•State Street Global Markets, LLC

•TD Prime Services LLC

•The Bank of New York Mellon

•Treasury Curve

•UBS Financial Services Inc.

•US Bank, National Association

•Valic Financial Advisors, Inc.

•Wells Fargo Bank, N.A.

•Wells Fargo Clearing Services

•Wells Fargo Securities LLC

Counsel and Independent Registered Public Accounting Firm

Ropes & Gray LLP serves as counsel to the Trust. The principal business address of Ropes & Gray LLP is 800 Boylston Street, Boston, Massachusetts 02199. Sullivan & Worcester LLP, located at One Post Office Square, Boston, Massachusetts 02109, serves as independent counsel to the Independent Trustees.

Ernst & Young LLP serves as the independent registered public accounting firm for the Trust and provides (i) audit services and (ii) tax services. In connection with the audit of the 2024 financial statements, the Trust entered into an engagement agreement with Ernst & Young LLP that sets forth the terms of Ernst & Young LLP's audit engagement. The principal business address of Ernst & Young LLP is 200 Clarendon Street, Boston, Massachusetts 02116.

BROKERAGE ALLOCATION AND OTHER PRACTICES

All portfolio transactions are placed on behalf of a Fund by the Adviser. Purchases and sales of securities on a securities exchange are affected through brokers who charge a commission for their services. Ordinarily commissions are not charged on over-the-counter orders (e.g., fixed income securities) because the Funds pay a spread which is included in the cost of the security and represents the difference between the dealer's quoted price at which it is willing to sell the security and the dealer's quoted price at which it is willing to buy the security. When a Fund executes an over-the-counter order with an electronic communications network or an alternative trading system, a commission is charged by such electronic communications networks and alternative trading systems as they execute such orders on an agency basis. Securities may be purchased from underwriters at prices that include underwriting fees.

In placing a portfolio transaction, the Adviser seeks to achieve best execution. The Adviser's duty to seek best execution requires the Adviser to take reasonable steps to obtain for the client as favorable an overall result as possible for Fund portfolio transactions under the circumstances, taking into account various factors that are relevant to the particular transaction.

The Adviser refers to and selects from the list of approved trading counterparties maintained by the Adviser's Credit Risk Management team. In selecting a trading counterparty for a particular trade, the Adviser seeks to weigh relevant factors including, but not limited to the following:

•Prompt and reliable execution;

•The competitiveness of commission rates and spreads, if applicable;

•The financial strength, stability and/or reputation of the trading counterparty;

•The willingness and ability of the executing trading counterparty to execute transactions (and commit capital) of size in liquid and illiquid markets without disrupting the market for the security;

•Local laws, regulations or restrictions;

•The ability of the trading counterparty to maintain confidentiality;

•The availability and capability of execution venues, including electronic communications networks for trading and execution management systems made available to Adviser;

•Market share;

•Liquidity;

•Price;

•Execution related costs;

•History of execution of orders;

•Likelihood of execution and settlement;

•Order size and nature;

•Clearance and settlement capabilities, especially in high volatility market environments;

•Availability of lendable securities;

•Sophistication of the trading counterparty's trading capabilities and infrastructure/facilities;

•The operational efficiency with which transactions are processed and cleared, taking into account the order size and complexity;

•Speed and responsiveness to the Adviser;

•Access to secondary markets;

•Counterparty exposure; and

•Depending upon the circumstances, the Adviser may take other relevant factors into account if the Adviser believes that these are important in taking all sufficient steps to obtain the best possible result for execution of the order.

In selecting a trading counterparty, the price of the transaction and costs related to the execution of the transaction typically merit a high relative importance, depending on the circumstances. The Adviser does not necessarily select a trading counterparty based upon price and costs but may take other relevant factors into account if it believes that these are important in taking reasonable steps to obtain the best possible result for a Fund under the circumstances. Consequently, the Adviser may cause a client to pay a trading counterparty more than another trading counterparty might have charged for the same transaction in recognition of the value and quality of the brokerage services provided. The following matters may influence the relative importance that the Adviser places upon the relevant factors:

(i)

The nature and characteristics of the order or transaction. For example, size of order, market impact of order, limits, or other instructions relating to the order;

(ii)

The characteristics of the financial instrument(s) or other assets which are the subject of that order. For example, whether the order pertains to an equity, fixed income, derivative or convertible instrument;

(iii)

The characteristics of the execution venues to which that order can be directed, if relevant. For example, availability and capabilities of electronic trading systems;

(iv)

Whether the transaction is a ‘delivery versus payment' or ‘over-the-counter' transaction. The creditworthiness of the trading counterparty, the amount of existing exposure to a trading counterparty and trading counterparty settlement capabilities may be given a higher relative importance in the case of ‘over-the-counter' transactions; and/or

(v)

Any other circumstances that the Adviser believes are relevant at the time.

The process by which trading counterparties are selected to effect transactions is designed to exclude consideration of the sales efforts conducted by broker-dealers in relation to the Funds.

The Adviser does not currently use the Funds' assets in connection with third-party soft dollar arrangements. While the Adviser does not currently use “soft” or commission dollars paid by the Funds for the purchase of third-party research, the Adviser reserves the right to do so in the future.

DECLARATION OF TRUST, CAPITAL STOCK AND OTHER INFORMATION

Capitalization

Under the Declaration of Trust, the Trustees are authorized to issue an unlimited number of shares of each Fund. Upon liquidation or dissolution of a Fund, investors are entitled to share pro rata in the Fund's net assets available for distribution to its investors. Investments in a Fund have no preference, preemptive, conversion or similar rights, except as determined by the Trustees or as set forth in the Bylaws, and are fully paid and non-assessable, except as set forth below.

Declarations of Trust

The Declarations of Trust of the Trust and the Master Trust each provide that a Trust may redeem shares of a Fund at the redemption price that would apply if the share redemption were initiated by a shareholder. It is the policy of each Trust that, except upon such conditions as may from time to time be set forth in the then current prospectus of a Fund or to facilitate a Trust's or a Fund's compliance with applicable law or regulation, a Trust would not initiate a redemption of shares unless it were to determine that failing to do so may have a substantial adverse consequence for a Fund or the Trust.

Each Trust's Declaration of Trust provides that a Trustee who is not an “interested person” (as defined in the 1940 Act) of a Trust will be deemed independent and disinterested with respect to any demand made in connection with a derivative action or proceeding. It is the policy of each Trust that it will not assert that provision to preclude a shareholder from claiming that a Trustee is not independent or disinterested with respect to any demand made in connection with a derivative action or proceeding; provided, however, that the foregoing policy will not prevent the Trusts from asserting applicable law (including Section 2B of Chapter 182 of the Massachusetts General Laws) to preclude a shareholder from claiming that a Trustee is not independent or disinterested with respect to any demand made in connection with a derivative action or proceeding.

A Trust will not deviate from the foregoing policies in a manner that adversely affects the rights of shareholders of a Fund without the approval of “a vote of a majority of the outstanding voting securities” (as defined in the 1940 Act) of such Fund.

Voting

Each shareholder is entitled to a vote in proportion to the number of Fund shares it owns. Shares do not have cumulative voting rights in the election of Trustees, and shareholders holding more than 50% of the aggregate outstanding shares in the Trust may elect all of the Trustees if they choose to do so. The Trust is not required and has no current intention to hold annual meetings of shareholders but the Trust will hold special meetings of shareholders when in the judgment of the Trustees it is necessary or desirable to submit matters for a shareholder vote.

Massachusetts Business Trust

Under Massachusetts law, shareholders in a Massachusetts business trust could, under certain circumstances, be held personally liable for the obligations of the trust. However, the Declaration of Trust disclaims shareholder liability for acts or obligations of the Trust and provides for indemnification out of the property of the applicable series of the Trust for any loss to which the shareholder may become subject by reason of being or having been a shareholder of that series and for reimbursement of the shareholder for all expense arising from such liability. Thus, the risk of a shareholder incurring financial loss on account of shareholder liability should be limited to circumstances in which the series would be unable to meet its obligations.

PRICING OF SHARES

Pricing of shares of the Funds does not occur on New York Stock Exchange (“NYSE”) holidays. The NYSE is open for trading every weekday except for: (a) the following holidays: New Year's Day, Martin Luther King, Jr.'s Birthday, Washington's Birthday (the third Monday in February), Good Friday, Memorial Day, Juneteenth National Independence Day, Independence Day, Labor Day, Thanksgiving Day and Christmas; and (b) the preceding Friday or the subsequent Monday when one of the calendar-determined holidays falls on a Saturday or Sunday, respectively. Purchases and withdrawals will be effected at the time of determination of NAV next following the receipt of any purchase or withdrawal order which is determined to be in good order. The Funds' securities will be valued pursuant to guidelines established by the Board of Trustees.

Each Fund seeks to maintain a constant price per share of $1.00 for purposes of sales and redemptions of shares by using the amortized cost valuation method to value its portfolio instruments in accordance with Rule 2a-7 under the 1940 Act. There can be no assurance that the $1.00 NAV per share will be maintained. The amortized cost method involves valuing an instrument at its cost and thereafter assuming a constant amortization to maturity of any discount or premium, even though the portfolio security may increase or decrease in market value, generally in response to changes in interest rates. While this method provides certainty in valuation, it may result in periods during which value, as determined by amortized cost, is higher or lower than the price each Fund would receive if it sold the instrument.

For example, in periods of declining interest rates, the daily yield on each of the Fund's shares computed by dividing the annualized daily income on the Fund's portfolio by the NAV based upon the amortized cost valuation technique may tend to be higher than a similar computation made by using a method of valuation based upon market prices and estimates thereof. In periods of rising interest rates, the daily yield on each Fund's shares computed the same way may tend to be lower than a similar computation made by using a method of calculation based upon market prices and estimates.

The Trustees have established procedures reasonably designed to stabilize each Fund's price per share at $1.00. These procedures include: (1) the determination of the deviation from $1.00, if any, of each Fund's NAV using market values; (2) periodic review by the Trustees of the amount of and the methods used to calculate the deviation; and (3) maintenance of records of such determination. The Trustees will promptly consider what action, if any, should be taken if such deviation exceeds 1/2 of one percent.

Negative Interest Rate Environments

In the event of a negative interest rate environment, the net income of a Fund may fall below zero (i.e., become negative). If this occurs, the Trustees may enact certain measures to seek to maintain a stable NAV per share at $1.00 for each applicable Fund. These measures may include the reduction or suspension of the issuance of dividends, the implementation of reverse distributions, or periodic reverse share splits, as necessary in the Trustees' judgment, to seek to maintain a stable NAV per share at $1.00. The measures taken by the Trustees in an effort to stabilize the NAV per share at $1.00 are subject to applicable law and the provisions of the Fund's organizational documents. Investments in a Fund are subject to the potential that the Trustees may enact such measures.

A Fund may also effect reverse distributions to offset the impact of the negative income on a Fund's NAV per share, thereby reducing the number of shares outstanding and maintaining a stable NAV per share at $1.00. In a reverse distribution, the number of shares would be reduced on a pro rata basis from each shareholder. If there is a reverse share split, the number of shares of a Fund will decrease, on a pro rata basis, as necessary to reflect the negative income of the Fund and maintain a stable NAV per share at $1.00.

Depending on the specific measure(s) taken, these measures would result in shareholders not receiving a dividend, holding fewer shares of the Fund and/or experiencing a loss in the aggregate value of their investment in the Fund. There is no assurance that the Trustees will take such actions or that such measures will result in a stable NAV per share of $1.00.

If the Trustees determine that it is no longer in the best interests of the Trust and its shareholders to maintain a stable price of $1.00 per share or if the Trustees believe that maintaining such price no longer reflects a market based NAV, the Trustees have the right to change from an amortized cost basis of valuation to valuation based on market quotations. If a Fund changes from an amortized cost basis of valuation to valuation based on market quotations, the Fund's losses would be reflected in the Fund's share price. The Trust will notify shareholders of an applicable Fund of any such change from using an amortized cost basis of valuation to valuation based on market quotations.

TAXATION OF THE FUNDS

The following discussion of U.S. federal income tax consequences of an investment in the Funds is based on the Code, U.S. Treasury regulations, and other applicable authority, as of the date of this SAI. These authorities are subject to change by legislative or administrative action, possibly with retroactive effect. The following discussion is only a summary of some of the important U.S. federal income tax considerations generally applicable to investments in the Funds. There may be other tax considerations applicable to particular shareholders. Shareholders should consult their own tax advisors regarding their particular situation and the possible application of foreign, state and local tax laws.

Each Fund invests substantially all of its assets in a corresponding Portfolio (which may be a series of State Street Master Funds) (in each case, a “Portfolio”), and so substantially all of each such Fund's income will result from distributions or deemed distributions, or allocations, as the case may be, from the corresponding Portfolio. Therefore, as applicable, references to the U.S. federal income tax treatment of the Funds, including to the assets owned and the income earned by the Funds, will be to or will include such treatment of the corresponding Portfolio, and, as applicable, the assets owned and the income earned by the corresponding Portfolio. See “Tax Considerations Applicable to Funds Investing in Portfolios Treated as Partnerships” and “Tax Considerations Applicable to Funds Investing in Portfolios Treated as RICs” below for further information.

Special tax rules apply to investments through defined contribution plans and other tax-qualified plans or tax-advantaged arrangements. Shareholders should consult their tax advisors to determine the suitability of shares of a Fund as an investment through such plans and arrangements and the precise effect of an investment on their particular tax situations.

Qualification as a Regulated Investment Company

Each Fund has elected or intends to elect to be treated as a RIC under Subchapter M of the Code and intends each year to qualify and be eligible to be treated as such. In order to qualify for the special tax treatment accorded RICs and their shareholders, each Fund must, among other things, (a) derive at least 90% of its gross income for each taxable year from (i) dividends, interest, payments with respect to certain securities loans, gains from the sale of securities or foreign currencies, or other income (including but not limited to gains from options, futures or forward contracts) derived with respect to its business of investing in such stock, securities or currencies and (ii) net income derived from interests in “qualified publicly traded partnerships” (as defined below); (b) diversify its holdings so that, at the end of each quarter of the Fund's taxable year, (i) at least 50% of the value of the Fund's total assets consists of cash and cash items (including receivables), U.S. Government securities, securities of other RICs, and other securities limited in respect of any one issuer to a value not greater than 5% of the value of the Fund's total assets and no more than 10% of the outstanding voting securities of such issuer, and (ii) no more than 25% of its assets are invested, including through corporations in which the Fund owns a 20% or more voting stock interest, (x) in the securities (other than those of the U.S. Government or other RICs) of any one issuer or of two or more issuers which the Fund controls and which are engaged in the same, similar or related trades and businesses, or (y) in the securities of one or more qualified publicly traded partnerships (as defined below); and (c) distribute with respect to each taxable year at least 90% of the sum of its investment company taxable income (as that term is defined in the Code without regard to the deduction for dividends paid – generally taxable ordinary income and the excess, if any, of net short-term capital gains over net long-term capital losses) and net tax-exempt income, for such year.

However, 100% of the net income derived from an interest in a “qualified publicly traded partnership” (a partnership (x) the interests in which are traded on an established securities market or are readily tradable on a secondary market or the substantial equivalent thereof, and (y) that derives less than 90% of its income from the qualifying income described in section (a)(i) of the preceding paragraph), will be treated as qualifying income. In general, such entities will be treated as partnerships for U.S. federal income tax purposes, because they meet the passive income requirement under Code Section 7704(c)(2). Further, although in general the passive loss rules of the Code do not apply to RICs, such rules do apply to a RIC with respect to items attributable to an interest in a qualified publicly traded partnership.

For purposes of the diversification test in (b) above, the term “outstanding voting securities of such issuer” will include the equity securities of a qualified publicly traded partnership. Also, for purposes of the diversification test in (b) above, the identification of the issuer (or, in some cases, issuers) of a particular investment can depend on the terms and conditions of that investment. In some cases, identification of the issuer (or issuers) is uncertain under current law, and an adverse determination or future guidance by the Internal Revenue Service (“IRS”) with respect to issuer identification for a particular type of investment may adversely affect a Fund's ability to meet the diversification test in (b) above.

If a Fund qualifies as a RIC that is accorded special tax treatment, the Fund will not be subject to U.S. federal income tax on income or gains distributed in a timely manner to its shareholders in the form of dividends (including Capital Gain Dividends, as defined below). If a Fund were to fail to meet the income, diversification or distribution test described above, the Fund could in some cases cure such failure, including by paying a Fund-level tax, paying interest or disposing of certain assets. If such Fund were ineligible to or otherwise did not cure such failure for any year, or if such Fund were otherwise to fail to qualify as a RIC accorded special tax treatment in any taxable year, the Fund would be subject to tax at the Fund level on its taxable income at corporate rates, and all distributions from earnings and profits, including any distributions of net tax-exempt income (if any) and net capital gains (as defined below), would be taxable to shareholders as ordinary income. Some portions of such distributions may be eligible for the dividends-received deduction in the case of corporate shareholders and may be eligible to be treated as “qualified dividend income” in the case of shareholders taxed as individuals, provided, in both cases, the shareholder meets certain holding period and other requirements in respect of a Fund's shares (each as described below). In addition, a Fund could be required to recognize unrealized gains, pay substantial taxes and interest and make substantial distributions before re-qualifying as a RIC that is accorded special tax treatment.

Each Fund intends to distribute at least annually to its shareholders all or substantially all of its investment company taxable income (computed without regard to the dividends-paid deduction) and its net tax-exempt income (if any), and may distribute its net capital gain (that is, the excess of net long-term capital gain over net short-term capital loss, in each case determined with reference to any loss carryforwards). Any taxable income retained by a Fund will be subject to tax at the Fund level at regular corporate rates. If a Fund retains any net capital gain, it will be subject to tax at regular corporate rates on the amount retained, but it is permitted to designate the retained amount as undistributed capital gain in a timely notice to its shareholders who (a) will be required to include in income for U.S. federal income tax purposes, as long-term capital gain, their shares of such undistributed amount, and (b) will be entitled to credit their proportionate shares of the tax paid by the Fund on such undistributed amount against their U.S. federal income tax liabilities, if any, and to claim refunds on a properly-filed U.S. tax return to the extent the credit exceeds such liabilities. If a Fund makes this designation, for U.S. federal income tax purposes, the tax basis of shares owned by a shareholder of the Fund will be increased by an amount equal to the difference between the amount of undistributed capital gains included in the shareholder's gross income under clause (a) of the preceding sentence and the tax deemed paid by the shareholder under clause (b) of the preceding sentence. The Funds are not required to, and there can be no assurance a Fund will, make this designation if it retains all or a portion of its net capital gain in a taxable year.

In determining its net capital gain, including in connection with determining the amount available to support a Capital Gain Dividend (as defined below), its taxable income, and its earnings and profits, a RIC generally may elect to treat part or all of any post-October capital loss (defined as any net capital loss attributable to the portion, if any, of the taxable year after October 31 or, if there is no such loss, the net long-term capital loss or net short-term capital loss attributable to any such portion of the taxable year) or late-year ordinary loss (generally, the sum of its (i) net ordinary loss, if any, from the sale, exchange or other taxable disposition of property, attributable to the portion, if any, of the taxable year after October 31, and its (ii) other net ordinary loss, if any, attributable to the portion, if any, of the taxable year after December 31) as if incurred in the succeeding taxable year.

If a Fund were to fail to distribute in a calendar year at least an amount equal, in general, to the sum of 98% of its ordinary income for such year and 98.2% of its capital gain net income for the one-year period ending October 31 of such year (or November 30 or December 31, if the Fund is eligible to elect and so elects), plus any such amounts retained from the prior year, the Fund would be subject to a nondeductible 4% excise tax on the undistributed amounts. For purposes of the required excise tax distribution, a RIC's ordinary gains and losses from the sale, exchange or other taxable disposition of property that would otherwise be taken into account after October 31 of a calendar year (or November 30, if the Fund makes the election referred to above) generally are treated as arising on January 1 of the following calendar year; in the case of a Fund with a December 31 year end that makes the election described above, no such gains or losses will be so treated. Also, for these purposes, a Fund will be treated as having distributed any amount on which it is subject to corporate income tax for the taxable year ending within the calendar year. Each Fund intends generally to make distributions sufficient to avoid imposition of the excise tax, although there can be no assurance that it will be able to do so. Distributions declared by a Fund during October, November and December to shareholders of record on a date in any such month and paid by the Fund during the following January will be treated for U.S. federal tax purposes as paid by the Fund and received by shareholders on December 31 of the year in which declared.

Capital losses in excess of capital gains (“net capital losses”) are not permitted to be deducted against a Fund's net investment income. Instead, potentially subject to certain limitations, a Fund may carry net capital losses from any taxable year forward to subsequent taxable years to offset capital gains, if any, realized during such subsequent taxable years. Distributions from capital gains are generally made after applying any available capital loss carryforwards. Capital loss carryforwards are reduced to the extent they offset current-year net realized capital gains, whether the Fund retains or distributes such gains. A Fund may carry net capital losses forward to one or more subsequent taxable years without expiration; any such carryforward losses will retain their character as short-term or long-term. The Fund must apply such carryforwards first against gains of the same character. See a Fund's most recent annual shareholder report for the Fund's available capital loss carryovers as of the end of its most recently ended fiscal year.

Taxation of Distributions Received by Shareholders

capital gain over net short-term capital loss) that are properly reported by a Fund as capital gain dividends (“Capital Gain Dividends”) generally will be taxable to a shareholder receiving such distributions as long-term capital gains includible in net capital gain and taxed to individuals at reduced rates relative to ordinary income. Distributions from capital gains are generally made after applying any available capital loss carryovers. The IRS and the Department of the Treasury have issued regulations that impose special rules in respect of Capital Gain Dividends received through partnership interests constituting “applicable partnership interests” under Section 1061 of the Code. The Funds do not expect to distribute Capital Gain Dividends. Distributions of net short-term capital gain (as reduced by any net long-term capital loss for the taxable year) will be taxable to shareholders as ordinary income. Distributions of investment income properly reported by a Fund and, in the case of a Fund investing in a Portfolio treated as a RIC, the Portfolio, as derived from “qualified dividend income” will be taxed in the hands of individuals at the rates applicable to net capital gain, provided holding period and other requirements are met at each of the shareholder, the Portfolio and, in the case of a Fund investing in a Portfolio treated as a RIC, the Fund level. The Funds do not expect Fund distributions to be derived from qualified dividend income.

The Code generally imposes a 3.8% Medicare contribution tax on the net investment income of certain individuals, trusts and estates to the extent their income exceeds certain threshold amounts. For these purposes, “net investment income” generally includes, among other things, (i) distributions paid by a Fund of net investment income and capital gains, and (ii) any net gain from the sale, redemption, exchange or other taxable disposition of Fund shares. Shareholders are advised to consult their tax advisors regarding the possible implications of this additional tax on their investment in a Fund.

If a Fund makes a distribution to a shareholder in excess of the Fund's current and accumulated earnings and profits in any taxable year, the excess distribution will be treated as a return of capital to the extent of such shareholder's tax basis in its shares, and thereafter as capital gain. A return of capital is not taxable, but it reduces a shareholder's tax basis in its shares, thus reducing any loss or increasing any gain on a subsequent taxable disposition by the shareholder of its shares.

Shareholders of a Fund will be subject to U.S. federal income taxes as described herein on distributions made by the Fund whether received in cash or reinvested in additional shares of the Fund.

Distributions with respect to a Fund's shares are generally subject to U.S. federal income tax as described herein to the extent they do not exceed the Fund's realized income and gains, even though such distributions may economically represent a return of a particular shareholder's investment. Such distributions are likely to occur in respect of shares purchased at a time when a Fund's NAV includes either unrealized gains, or realized but undistributed income or gains, that were therefore included in the price the shareholder paid. Such distributions may reduce the fair market value of the Fund's shares below the shareholder's cost basis in those shares. As described above, a Fund is required to distribute realized income and gains regardless of whether the Fund's NAV also reflects unrealized losses.

In order for some portion of the dividends received by a Fund shareholder to be “qualified dividend income,” the corresponding Portfolio must meet holding period and other requirements with respect to the dividend-paying stocks held by the Portfolio, the shareholder must meet holding period and other requirements with respect to the Fund's shares, and in the case of a Fund investing in a Portfolio treated as a RIC, the Fund must meet holding period and other requirements with respect to its shares in the Portfolio. In general, a dividend will not be treated as qualified dividend income (at any of the Portfolio, Fund or shareholder level, as applicable) (a) if the dividend is received with respect to any share of stock held for fewer than 61 days during the 121-day period beginning on the date which is 60 days before the date on which such share becomes ex-dividend with respect to such dividend (or, in the case of certain preferred stock, 91 days during the 181-day period beginning 90 days before such date), (b) to the extent that the recipient is under an obligation (whether pursuant to a short sale or otherwise) to make related payments with respect to positions in substantially similar or related property, (c) if the recipient elects to have the dividend income treated as investment income for purposes of the limitation on deductibility of investment interest, or (d) if the dividend is received from a foreign corporation that is (i) not eligible for the benefits of a comprehensive income tax treaty with the United States (with the exception of dividends paid on stock of such a foreign corporation readily tradable on an established securities market in the United States) or (ii) treated as a passive foreign investment company.

Portfolio that is treated as a RIC, during any taxable year are 95% or more of the Fund's gross income (excluding net long-term capital gain over net short-term capital loss), then 100% of the Fund's dividends (other than dividends properly reported as Capital Gain Dividends) will be eligible to be treated as qualified dividend income.

In general, dividends of net investment income received by corporate shareholders of a Fund will qualify for the dividends-received deduction generally available to corporations to the extent of the amount of eligible dividends from domestic corporations received by a Portfolio (a) that is treated as a partnership and allocated to the Fund, or (b) that is treated as a RIC and in turn paid by the Portfolio to the Fund for the taxable year. A dividend so allocated or paid to a Fund will not be treated as a dividend eligible for the dividends-received deduction (at any of the Portfolio, Fund or shareholder level, as applicable) (a) if it has been received with respect to any share of stock that the Portfolio has held for less than 46 days (91 days in the case of certain preferred stock) during the 91-day period beginning on the date which is 45 days before the date on which such share becomes ex-dividend with respect to such dividend (during the 181-day period beginning 90 days before such date in the case of certain preferred stock) or (b) to the extent that the Portfolio is under an obligation (pursuant to a short sale or otherwise) to make related payments with respect to positions in substantially similar or related property. Moreover, a Fund that invests in a corresponding Portfolio that is treated as a RIC must meet similar requirements with respect to its shares of the corresponding Portfolio. Finally, the dividends-received deduction may otherwise be disallowed or reduced (x) if the corporate shareholder fails to satisfy the foregoing requirements with respect to its shares of the Fund or (y) by application of various provisions of the Code (for instance, the dividends-received deduction is reduced in the case of a dividend received on debt-financed portfolio stock (generally, stock acquired with borrowed funds)). The Funds do not expect Fund distributions to be eligible for the dividends-received deduction.

Any distribution of income that is attributable to (a) income received by a Fund in lieu of dividends with respect to securities on loan pursuant to a securities lending transaction or (b) dividend income received by a Fund on securities it temporarily purchased from a counterparty pursuant to a repurchase agreement that is treated for U.S. federal income tax purposes as a loan by the Fund, will not constitute qualified dividend income to individual shareholders and will not be eligible for the dividends-received deduction for corporate shareholders.

If a Fund holds, directly or indirectly, one or more “tax credit bonds” issued on or before December 31, 2017, on one or more applicable dates during a taxable year, the Fund may elect to permit its shareholders to claim a tax credit on their income tax returns equal to each shareholder's proportionate share of tax credits from the bond otherwise allowed to the Fund. In such a case, a shareholder will be deemed to receive a distribution of money with respect to its Fund shares equal to the shareholder's proportionate share of the amount of such credits and be allowed a credit against the shareholder's U.S. federal income tax equal to the amount of such deemed distribution. A shareholder's ability to claim a tax credit associated with one or more tax credit bonds may be subject to certain limitations imposed by the Code, and the amount of the tax credits may not exceed the amount reported by the Fund in a written notice to shareholders. Even if a Fund is eligible to pass through tax credits to shareholders, the Fund may choose not to do so.

Tax Considerations Applicable to Funds Investing in Portfolios Treated as Partnerships

Certain Funds invest substantially all of their investable assets in a corresponding Portfolio that is treated as a partnership for U.S. federal income tax purposes. In such cases the nature and character of each such Fund's income, gains, losses and deductions will generally be determined at the Portfolio level and each such Fund will be allocated its share of Portfolio income and gains. As applicable, references to income, gains, losses and deductions of a Fund will be to income, gains and losses recognized and deductions accruing at the Portfolio level and allocated to or otherwise taken into account by the Fund, and references to assets of a Fund will be to the Fund's allocable share of the assets of the corresponding Portfolio.

A Fund may be required to redeem a portion of its interest in a Portfolio in order to obtain sufficient cash to make the requisite distributions to maintain its qualification for treatment as a RIC. The Portfolio in turn may be required to sell investments in order to meet such redemption requests, including at a time when it may not be advantageous to do so.

A Fund is permitted to realize a loss on a redemption of Portfolio shares only if and when all Portfolio shares held by the Fund are completely redeemed for cash.

Tax Considerations Applicable to Funds Investing in Portfolios Treated as RICs

The following considerations are relevant to shareholders of Funds that invest substantially all of their assets in a corresponding Portfolio that has elected or intends to elect to be treated and to qualify and be eligible to be treated each year as a RIC.

Substantially all of such a Fund's income will result from distributions or deemed distributions from the corresponding Portfolio. Additionally, whether a Fund will meet the asset diversification test described above will depend on whether the corresponding Portfolio meets each of the income, diversification and distribution tests. If a Portfolio were to fail to meet any such test and were ineligible to or otherwise were not to cure such failure, the corresponding Fund would as a result itself fail to meet the asset diversification test and might be ineligible or unable to or might otherwise not cure such failure.

Because each Fund invests substantially all of its assets in shares of the corresponding Portfolio, its distributable income and gains will normally consist substantially of distributions from the corresponding Portfolio. To the extent that a Portfolio realizes net losses on its investments for a given taxable year, the corresponding Fund will not be able to benefit from those losses until, and only to the extent that (i) the Portfolio realizes gains that it can reduce by those losses, or (ii) the Fund recognizes its share of those losses when it disposes of shares of the Portfolio in a transaction qualifying for sale or exchange treatment. Moreover, even when a Fund does make such a disposition, any loss will be recognized as a capital loss, a portion of which may be a long-term capital loss. The Fund will not be able to offset any capital losses from its dispositions of shares of the corresponding Portfolio against its ordinary income (including distributions of any net short-term capital gains realized by a Portfolio), and the Fund's long-term capital losses first offset its long-term capital gains, increasing the likelihood that the Fund's short-term capital gains are distributed to shareholders as ordinary income.

Finally, a RIC generally must look through its 20 percent voting interest in a corporation, including a RIC, to the underlying assets thereof for purposes of the diversification test; special rules potentially provide limited relief from the application of this rule where a RIC owns such an interest in an underlying RIC (as defined below), such as a Portfolio.

Investments in Other RICs.

If a Fund receives dividends from a Portfolio treated as a RIC, or a Portfolio receives dividends from a mutual fund, an ETF or another investment company that qualifies as a RIC (each an “underlying RIC”) and the underlying RIC reports such dividends as qualified dividend income, then the Fund, or Portfolio, as applicable, is permitted, in turn, to report a portion of its distributions as “qualified dividend income,” provided the Fund, or Portfolio, as applicable, meets the holding period and other requirements with respect to shares of the underlying RIC.

If a Fund or Portfolio receives dividends from an underlying RIC and the underlying RIC reports such dividends as eligible for the dividends-received deduction, then the Fund or Portfolio, as applicable, is permitted, in turn, to report a portion of its distributions as eligible for the dividends-received deduction as well when it distributes such portion to its shareholders, provided holding period and other requirements are met.

If an underlying RIC in which a Fund invests elects to pass through tax credit bond credits to its shareholders, then the Fund is permitted in turn to elect to pass through its proportionate share of those tax credits to its shareholders, provided that the Fund meets shareholder notice and other requirements.

Tax Implications of Certain Fund Investments

Special Rules for Debt Obligations. Some debt obligations with a fixed maturity date of more than one year from the date of issuance (and zero-coupon debt obligations with a fixed maturity date of more than one year from the date of issuance) will be treated as debt obligations that are issued originally at a discount. Generally, OID is treated as interest income and is included in a Fund's income and required to be distributed by the Fund over the term of the debt obligation, even though payment of that amount is not received until a later time, upon partial or full repayment or disposition of the debt obligation. In addition, payment-in-kind obligations will give rise to income which is required to be distributed and is taxable even though the Fund holding the obligation receives no interest payment in cash on the obligation during the year.

over the purchase price of such obligation. Generally, any gain recognized on the disposition of, and any partial payment of principal on, a debt obligation having market discount is treated as ordinary income to the extent the gain, or principal payment, does not exceed the “accrued market discount” on such debt obligation. Alternatively, a Fund may elect to accrue market discount currently, in which case the Fund will be required to include the accrued market discount in income (as ordinary income) and thus distribute it over the term of the debt obligation, even though payment of that amount is not received until a later time, upon partial or full repayment or disposition of the debt obligation. If a Fund makes the election referred to in the preceding sentence, then the rate at which the market discount accrues, and thus is included in a Fund's income, will depend upon which of the permitted accrual methods the Fund elects.

If a Fund holds the foregoing kinds of obligations, or other obligations subject to special rules under the Code, the Fund may be required to pay out as an income distribution each year an amount which is greater than the total amount of cash interest the Fund actually received. Such distributions may be made from the cash assets of the Fund or, if necessary, by disposition of portfolio securities, including at a time when it may not be advantageous to do so. These dispositions may cause a Fund to realize higher amounts of short-term capital gains (generally taxed to shareholders at ordinary income tax rates) and, in the event the Fund realizes net capital gains from such transactions, its shareholders may receive a larger Capital Gain Dividend than they would have if the Fund had not held such obligations.

A portion of the OID accrued on certain high yield discount obligations may not be deductible to the issuer and will instead be treated as a dividend paid by the issuer for purposes of the dividends-received deduction. In such cases, if the issuer of the high yield discount obligations is a domestic corporation, dividend payments by a Fund may be eligible for the dividends-received deduction to the extent attributable to the deemed dividend portion of such OID.

Securities Purchased at a Premium. Very generally, where a Fund purchases a bond at a price that exceeds the redemption price at maturity – that is, at a premium – the premium is amortizable over the remaining term of the bond. In the case of a taxable bond, if a Fund makes an election applicable to all such bonds it purchases, which election is irrevocable without consent of the IRS, the Fund reduces the current taxable income from the bond by the amortized premium and reduces its tax basis in the bond by the amount of such offset; upon the disposition or maturity of such bonds acquired on or after January 4, 2013, the Fund is permitted to deduct any remaining premium allocable to a prior period.

At-risk or Defaulted Securities. Investments in debt obligations that are at risk of or in default present special tax issues for the Funds. Tax rules are not entirely clear about issues such as when a Fund may cease to accrue interest, OID or market discount; whether, when or to what extent the Fund should recognize market discount on such debt obligations; when and to what extent a Fund may take deductions for bad debts or worthless securities; and how a Fund should allocate payments received on obligations in default between principal and income. These and other related issues will be addressed by a Fund when, as and if it invests in such securities, in order to seek to ensure that it distributes sufficient income to preserve its status as a RIC and does not become subject to U.S. federal income or excise tax.

Certain Investments in Mortgage Pooling Vehicles. Certain Funds may invest directly or indirectly in residual interests in real estate mortgage investment conduits (“REMICs”) (including by investing in residual interests in CMOs with respect to which an election to be treated as a REMIC is in effect) or equity interests in taxable mortgage pools (“TMPs”). Under a notice issued by the IRS in October 2006 and Treasury regulations that have yet to be issued but may apply retroactively, a portion of a Fund's income (including income allocated to the Fund from certain pass-through entities) that is attributable to a residual interest in a REMIC or an equity interest in a TMP (referred to in the Code as an “excess inclusion”) will be subject to U.S. federal income tax in all events. This notice also provides, and the regulations are expected to provide, that excess inclusion income of a RIC, such as a Fund, will be allocated to shareholders of the RIC in proportion to the dividends received by such shareholders, with the same consequences as if the shareholders held the related interest directly. As a result, a RIC investing in such securities may not be a suitable investment for charitable remainder trusts (“CRTs”), as noted below.

In general, excess inclusion income allocated to shareholders (i) cannot be offset by net operating losses (subject to a limited exception for certain thrift institutions), (ii) will constitute unrelated business taxable income (“UBTI”) to entities (including a qualified pension plan, an individual retirement account, a 401(k) plan, a Keogh plan or other tax-exempt entity) subject to tax on UBTI, thereby potentially requiring such an entity that is allocated excess inclusion income, and that otherwise might not be required to file a tax return, to file a tax return and pay tax on such income, and (iii) in the case of a foreign shareholder will not qualify for any reduction in U.S. federal withholding tax. A shareholder will be subject to U.S. federal income tax on such inclusions notwithstanding any exemption from such income tax otherwise available under the Code.

Foreign Currency Transactions. Any transaction by a Fund in foreign currencies, foreign currency-denominated debt obligations or certain foreign currency options, futures contracts or forward contracts (or similar instruments) may give rise to ordinary income or loss to the extent such income or loss results from fluctuations in the value of the foreign currency concerned. Any such net gains could require a larger dividend toward the end of the calendar year. Any such net losses will generally reduce and potentially require the recharacterization of prior ordinary income distributions. Such ordinary income treatment may accelerate a Fund's distributions to shareholders and increase the distributions taxed to shareholders as ordinary income. Any net ordinary losses so created cannot be carried forward by the Fund to offset income or gains earned in subsequent taxable years.

Options and Futures. In general, option premiums received by a Fund are not immediately included in the income of the Fund. Instead, the premiums are recognized when the option contract expires, the option is exercised by the holder, or the Fund transfers or otherwise terminates the option (e.g., through a closing transaction). If a call option written by a Fund is exercised and the Fund sells or delivers the underlying stock, the Fund generally will recognize capital gain or loss equal to (a) the sum of the strike price and the option premium received by the Fund minus (b) the Fund's basis in the stock. Such gain or loss generally will be short-term or long-term depending upon the holding period of the underlying stock. If securities are purchased by a Fund pursuant to the exercise of a put option written by it, the Fund generally will subtract the premium received for purposes of computing its cost basis in the securities purchased. Gain or loss arising in respect of a termination of a Fund's obligation under an option other than through the exercise of the option will be short-term gain or loss depending on whether the premium income received by the Fund is greater or less than the amount paid by the Fund (if any) in terminating the transaction. Thus, for example, if an option written by a Fund expires unexercised, the Fund generally will recognize short-term gain equal to the premium received.

A Fund's options activities may include transactions constituting straddles for U.S. federal income tax purposes, that is, that trigger the U.S. federal income tax straddle rules contained primarily in Section 1092 of the Code. Such straddles include, for example, positions in a particular security, or an index of securities, and one or more options that offset the former position, including options that are “covered” by a Fund's long position in the subject security. Very generally, where applicable, Section 1092 requires (i) that losses be deferred on positions deemed to be offsetting positions with respect to “substantially similar or related property,” to the extent of unrealized gain in the latter, and (ii) that the holding period of such a straddle position that has not already been held for the long-term holding period be terminated and begin anew once the position is no longer part of a straddle. Options on single stocks that are not “deep in the money” may constitute qualified covered calls, which generally are not subject to the straddle rules; the holding period on stock underlying qualified covered calls that are “in the money” although not “deep in the money” will be suspended during the period that such calls are outstanding. Thus, the straddle rules and the rules governing qualified covered calls could cause gains that would otherwise constitute long-term capital gains to be treated as short-term capital gains, and distributions that would otherwise constitute “qualified dividend income” or qualify for the dividends-received deduction to fail to satisfy the holding period requirements and therefore to be taxed as ordinary income or fail to qualify for the dividends-received deduction, as the case may be.

The tax treatment of certain positions entered into by a Fund, including regulated futures contracts, certain foreign currency positions and certain listed non-equity options, will be governed by section 1256 of the Code (“section 1256 contracts”). Gains or losses on section 1256 contracts generally are considered 60% long-term and 40% short-term capital gains or losses (“60/40”), although certain foreign currency gains and losses from such contracts may be treated as ordinary in character. Also, section 1256 contracts held by a Fund at the end of each taxable year (and, for purposes of the 4% excise tax, on certain other dates as prescribed under the Code) are “marked to market” with the result that unrealized gains or losses are treated as though they were realized and the resulting gain or loss is treated as ordinary or 60/40 gain or loss, as applicable.

Derivatives, Hedging, and Related Transactions. In addition to the special rules described above in respect of futures and options transactions, a Fund's transactions in other derivative instruments (e.g., forward contracts and swap agreements), as well as any of its hedging, short sale, securities loan or similar transactions, may be subject to one or more special tax rules (e.g., notional principal contract, straddle, constructive sale, wash sale and short sale rules). These rules may affect whether gains and losses recognized by a Fund are treated as ordinary or capital, accelerate the recognition of income or gains to the Fund, defer losses to the Fund, and cause adjustments in the holding periods of the Fund's securities, thereby affecting whether capital gains and losses are treated as short-term or long-term. These rules could therefore affect the amount, timing and/or character of distributions to shareholders.

Because these and other tax rules applicable to these types of transactions are in some cases uncertain under current law, an adverse determination or future guidance by the IRS with respect to these rules (which determination or guidance could be retroactive) may affect whether a Fund has made sufficient distributions, and otherwise satisfied the relevant requirements, to maintain its qualification as a RIC and avoid a Fund-level tax.

Book-Tax Differences. Certain of a Fund's investments in derivative instruments and foreign currency-denominated instruments, and any of the Fund's transactions in foreign currencies and hedging activities, are likely to produce a difference between its book income and the sum of its taxable income and net tax-exempt income (if any). If such a difference arises, and a Fund's book income is less than the sum of its taxable income and net tax-exempt income, the Fund could be required to make distributions exceeding book income to qualify as a RIC that is accorded special tax treatment and to avoid an entity-level tax. In the alternative, if a Fund's book income exceeds the sum of its taxable income (including realized capital gains) and net tax-exempt income, the distribution (if any) of such excess generally will be treated as (i) a dividend to the extent of the Fund's remaining earnings and profits (including earnings and profits arising from tax-exempt income), (ii) thereafter, as a return of capital to the extent of the recipient's basis in its shares, and (iii) thereafter as gain from the sale or exchange of a capital asset.

Backup Withholding

A Fund generally is required to withhold and remit to the U.S. Treasury a percentage of the taxable distributions and redemption proceeds paid to any individual shareholder who fails to properly furnish the Fund with a correct taxpayer identification number (“TIN”), who has under-reported dividend or interest income, or who fails to certify to the Fund that he or she is not subject to such withholding.

Backup withholding is not an additional tax. Any amounts withheld may be credited against the shareholder's U.S. federal income tax liability, provided the appropriate information is furnished to the IRS.

Tax-Exempt Shareholders

Income of a RIC that would be UBTI if earned directly by a tax-exempt entity will not generally constitute UBTI when distributed to a tax-exempt shareholder of the RIC. Notwithstanding this “blocking” effect, a tax-exempt shareholder could realize UBTI by virtue of its investment in a Fund if shares in the Fund constitute debt-financed property in the hands of the tax-exempt shareholder within the meaning of Code Section 514(b).

A tax-exempt shareholder may also recognize UBTI if a Fund recognizes “excess inclusion income” derived from direct or indirect investments in residual interests in REMICs or equity interests in TMPs if the amount of such income recognized by the Fund exceeds the Fund's investment company taxable income (after taking into account deductions for dividends paid by the Fund).

In addition, special tax consequences apply to CRTs that invest in RICs that invest directly or indirectly in residual interests in REMICs or equity interests in TMPs. Under legislation enacted in December 2006, a CRT (as defined in Section 664 of the Code) that realizes any UBTI for a taxable year must pay an excise tax annually of an amount equal to such UBTI. Under IRS guidance issued in October 2006, a CRT will not recognize UBTI as a result of investing in a RIC that recognizes “excess inclusion income.” Rather, if at any time during any taxable year a CRT (or one of certain other tax-exempt shareholders, such as the United States, a state or political subdivision, or an agency or instrumentality thereof, and certain energy cooperatives) is a record holder of a share in a RIC that recognizes “excess inclusion income,” then the RIC will be subject to a tax on that portion of its “excess inclusion income” for the taxable year that is allocable to such shareholders at the highest U.S. federal corporate income tax rate. The extent to which this IRS guidance remains applicable in light of the December 2006 legislation is unclear. To the extent permitted under the 1940 Act, each Fund may elect to specially allocate any such tax to the applicable CRT, or other shareholder, and thus reduce such shareholder's distributions for the year by the amount of the tax that relates to such shareholder's interest in a Fund. CRTs are urged to consult their tax advisors concerning the consequences of investing in each Fund.

Redemptions and Exchanges

Redemptions and exchanges of each Fund's shares are taxable events and, accordingly, shareholders may realize gain or loss on these transactions to the extent the NAV of Fund Shares varies from a shareholder's tax basis in such shares. In general, any gain or loss realized upon a taxable disposition of shares will be treated as long-term capital gain or loss if the shares have been held for more than 12 months. Otherwise, the gain or loss on the taxable disposition of Fund shares will be treated as short-term capital gain or loss. However, any loss realized upon a taxable disposition of Fund shares held by a shareholder for six months or less will be treated as long-term, rather than short-term, to the extent of any Capital Gain Dividends received (or deemed received) by the shareholder with respect to the shares.

The IRS permits a simplified method of accounting for gains and losses realized upon the disposition of shares of a RIC that is a money market fund. Very generally, rather than realizing gain or loss upon each redemption of a share, a shareholder of a Fund using such method of accounting will recognize gain or loss with respect to such a Fund's shares for a given computation period (the shareholder's taxable year or shorter period selected by the shareholder) equal to the value of all the Fund shares held by the shareholder on the last day of the computation period, less the value of all Fund shares held by the shareholder on the last day of the preceding computation period, less the shareholder's net investment in the Fund (generally, purchases minus redemptions) made during the computation period. Additionally, any loss realized on a sale of shares of the Fund will not be disallowed under “wash sale” rules to the extent the Fund qualifies as a “money market fund” under the 1940 Act. Shareholders of a Fund are urged to consult their own tax advisors regarding their investment in the Fund.

Tax Shelter Reporting

Under U.S. Treasury regulations, if a shareholder recognizes a loss of at least $2 million in any single taxable year or $4 million in any combination of taxable years for an individual shareholder or at least $10 million in any taxable year or $20 million in any combination of taxable years for a corporate shareholder, the shareholder must file with the IRS a disclosure statement on IRS Form 8886. Direct shareholders of portfolio securities are in many cases excepted from this reporting requirement, but under current guidance, shareholders of a RIC are not excepted. Future guidance may extend the current exception from this reporting requirement to shareholders of most or all RICs. The fact that a loss is reportable under these regulations does not affect the legal determination of whether the taxpayer's treatment of the loss is proper. Shareholders should consult their tax advisors to determine the applicability of these regulations in light of their individual circumstances.

Non-U.S. Shareholders

Non-U.S. shareholders in a Fund should consult their tax advisors concerning the tax consequences of ownership of shares in the Fund. Distributions by a Fund to shareholders that are not “U.S. persons” within the meaning of the Code (“foreign shareholders”) properly reported by the Fund as (1) Capital Gain Dividends, (2) short-term capital gain dividends, and (3) interest-related dividends, each as defined and subject to certain conditions described below, generally are not subject to withholding of U.S. federal income tax.

In general, the Code defines (1) “short-term capital gain dividends” as distributions of net short-term capital gains in excess of net long-term capital losses and (2) “interest-related dividends” as distributions from U.S.-source interest income of types similar to those not subject to U.S. federal income tax if earned directly by an individual foreign shareholder, in each case to the extent such distributions are properly reported as such by a Fund in a written notice to shareholders.

The exceptions to withholding for Capital Gain Dividends and short-term capital gain dividends do not apply to (A) distributions to an individual foreign shareholder who is present in the United States for a period or periods aggregating 183 days or more during the year of the distribution and (B) distributions attributable to gain that is treated as effectively connected with the conduct by the foreign shareholder of a trade or business within the United States under special rules regarding the disposition of “U.S. real property interests” (“USRPIs”) as described below. The exception to withholding for interest-related dividends does not apply to distributions to a foreign shareholder (i) that has not provided a satisfactory statement that the beneficial owner is not a U.S. person, (ii) to the extent that the dividend is attributable to certain interest on an obligation if the foreign shareholder is the issuer or is a 10% shareholder of the issuer, (iii) that is within certain foreign countries that have inadequate information exchange with the United States, or (iv) to the extent the dividend is attributable to interest paid by a person that is a related person of the foreign shareholder and the foreign shareholder is a controlled foreign corporation. If a Fund invests in a RIC that pays such distributions to the Fund, such distributions retain their character as not subject to withholding if properly reported when paid by the Fund to foreign shareholders. A RIC is permitted to report such parts of its dividends as are eligible to be treated as interest-related or short-term capital gain dividends, but is not required to do so. In the case of shares held through an intermediary, the intermediary may withhold even if a Fund reports all or a portion of a payment as an interest-related or short-term capital gain dividend to shareholders.

Foreign shareholders should contact their intermediaries regarding the application of withholding rules to their accounts.

Distributions by a Fund to foreign shareholders other than Capital Gain Dividends, short-term capital gain dividends and interest-related dividends (e.g., dividends attributable to dividend income or to short-term capital gains or U.S. source interest income to which the exception from withholding described above does not apply) are generally subject to withholding of U.S. federal income tax at a rate of 30% (or lower applicable treaty rate).

A foreign shareholder is not, in general, subject to U.S. federal income tax on gains (and is not allowed a deduction for losses) realized on the sale of shares of a Fund unless (a) such gain is effectively connected with the conduct of a trade or business carried on by such holder within the United States, (b) in the case of an individual holder, the holder is present in the United States for a period or periods aggregating 183 days or more during the year of the sale and certain other conditions are met, or (c) the special rules relating to gain attributable to the sale or exchange of USRPIs apply to the foreign shareholder's sale of shares of the Fund (as described below).

Foreign shareholders with respect to whom income from a Fund is effectively connected with a trade or business conducted by the foreign person within the United States will in general be subject to U.S. federal income tax on the income derived from the Fund at the graduated rates applicable to U.S. citizens, residents or domestic corporations, whether such income is received in cash or reinvested in shares of the Fund and, in the case of a foreign corporation, may also be subject to a branch profits tax. If a foreign shareholder is eligible for the benefits of a tax treaty, any effectively connected income or gain will generally be subject to U.S. federal income tax on a net basis only if it is also attributable to a permanent establishment maintained by the shareholder in the United States. More generally, foreign shareholders who are residents in a country with an income tax treaty with the United States may obtain different tax results than those described herein, and are urged to consult their tax advisors.

Special rules would apply if a Fund were a qualified investment entity (“QIE”) because it is either a “U.S. real property holding corporation” (“USRPHC”) or would be a USRPHC but for the operation of certain exceptions to the definition thereof. Very generally, a USRPHC is a domestic corporation that holds USRPIs the fair market value of which equals or exceeds 50% of the sum of the fair market values of the corporation's USRPIs, interests in real property located outside the United States, and other trade or business assets. USRPIs are generally defined as any interest in U.S. real property and any interest (other than solely as a creditor) in a USRPHC or, very generally, an entity that has been a USRPHC in the last five years. A Fund that holds, directly or indirectly, significant interests in real estate investment trusts (“REITs”) may be a USRPHC. Interests in domestically controlled QIEs, including REITs and RICs that are QIEs, not-greater-than-10% interests in publicly traded classes of stock in REITs and not-greater-than-5% interests in publicly traded classes of stock in RICs generally are not USRPIs, but these exceptions do not apply for purposes of determining whether a Fund is a QIE. If an interest in a Fund were a USRPI, the Fund would be required to withhold U.S. tax on the proceeds of a share redemption by a greater-than-5% foreign shareholder, in which case such foreign shareholder generally would also be required to file U.S. tax returns and pay any additional taxes due in connection with the redemption.

If a Fund were a QIE under a special “look-through” rule, any distributions by the Fund to a foreign shareholder attributable directly or indirectly to (i) distributions received by the Fund from a lower-tier RIC or REIT that the Fund is required to treat as USRPI gain in its hands and (ii) gains realized on the disposition of USRPIs by the Fund, would retain their character as gains realized from USRPIs in the hands of the Fund's foreign shareholders and would be subject to U.S. tax withholding. In addition, such distributions could result in the foreign shareholder being required to file a U.S. tax return and pay tax on the distributions at regular U.S. federal income tax rates. The consequences to a foreign shareholder, including the rate of such withholding and character of such distributions (e.g., as ordinary income or USRPI gain), would vary depending upon the extent of the foreign shareholder's current and past ownership of the Fund. Each Fund generally does not expect that it will be a QIE.

Foreign shareholders of a Fund also may be subject to “wash sale” rules to prevent the avoidance of the tax-filing and –payment obligations discussed above through the sale and repurchase of Fund shares.

Foreign shareholders should consult their tax advisors and, if holding shares through intermediaries, their intermediaries, concerning the application of these rules to their investment in a Fund.

Special rules (including withholding and reporting requirements) apply to foreign partnerships and those holding Fund shares through foreign partnerships. Additional considerations may apply to foreign trusts and estates. Investors holding Fund shares through foreign entities should consult their tax advisors about their particular situation.

A foreign shareholder may be subject to state and local tax and to the U.S. federal estate tax in addition to the U.S. federal income tax on income referred to above.

Shareholder Reporting Obligations With Respect To Foreign Bank and Financial Accounts

Shareholders that are U.S. persons and own, directly or indirectly, more than 50% of a Fund by vote or value could be required to report annually their “financial interest” in the Fund's “foreign financial accounts,” if any, on FinCEN Form 114, Report of Foreign Bank and Financial Accounts (“FBAR”). Shareholders should consult a tax advisor, and persons investing in a Fund through an intermediary should contact their intermediary, regarding the applicability to them of this reporting requirement.

Other Reporting and Withholding Requirements

Sections 1471-1474 of the Code and the U.S. Treasury and IRS guidance issued thereunder (collectively, “FATCA”) generally require a Fund to obtain information sufficient to identify the status of each of its shareholders under FATCA or under an applicable intergovernmental agreement (an “IGA”) between the United States and a foreign government. If a shareholder fails to provide the requested information or otherwise fails to comply with FATCA or an IGA, the Fund may be required to withhold under FATCA at a rate of 30% with respect to that shareholder on ordinary dividends it pays. The IRS and the Department of Treasury have issued proposed regulations providing that these withholding rules will not apply to the gross proceeds of share redemptions or Capital Gain Dividends a Fund pays. If a payment by a Fund is subject to FATCA withholding, the Fund is required to withhold even if such payment would otherwise be exempt from withholding under the rules applicable to foreign shareholders described above (e.g., short- term capital gain dividends and interest-related dividends).

Each prospective investor is urged to consult its tax advisor regarding the applicability of FATCA and any other reporting requirements with respect to the prospective investor's own situation, including investments through an intermediary.

General Considerations

The U.S. federal income tax discussion set forth above is for general information only. Prospective investors should consult their tax advisors regarding the specific U.S. federal income tax consequences of purchasing, holding, and disposing of shares of the Funds, as well as the effects of state, local, foreign, and other tax laws and any proposed tax law changes.

UNDERWRITER

SSGA FD serves as the Funds' distributor pursuant to the Distribution Agreement by and between SSGA FD and the Trust. Pursuant to the Distribution Agreement, the Funds pay SSGA FD fees under the Rule 12b-1 Plan in effect for the Funds. For a description of the fees paid to SSGA FD under the Rule 12b-1 Plan, see “Distribution Plans,” above. SSGA FD is not obligated to sell any specific number of shares and will sell shares of a Fund on a continuous basis only against orders to purchase shares. The principal business address of SSGA FD is One Iron Street, Boston, MA 02210.

FINANCIAL STATEMENTS

The audited financial statements for the fiscal year ended December 31, 2024 for the Funds are included in each Fund's Form N-CSR filing, which were filed with the SEC on March 6, 2025 (SEC Accession No. 0001193125-25-048021) and are incorporated into this SAI by reference. Each Fund's Form N-CSR filing is available, without charge, upon request, by calling (800) 647-7327 or through the Funds' website at www.ssga.com.

APPENDIX A

RATINGS OF DEBT INSTRUMENTS

MOODY'S INVESTORS SERVICE, INC. (“MOODY'S”)

GLOBAL LONG-TERM RATING SCALE

Ratings assigned on Moody's global long-term rating scale are forward-looking opinions of the relative credit risks of financial obligations issued by non-financial corporates, financial institutions, structured finance vehicles, project finance vehicles, and public sector entities. Long-term ratings are assigned to issuers or obligations with an original maturity of one year or more and reflect both on the likelihood of a default on contractually promised payments and the expected financial loss suffered in the event of default.

Aaa: Obligations rated Aaa are judged to be of the highest quality, subject to the lowest level of credit risk.

Aa: Obligations rated Aa are judged to be of high quality and are subject to very low credit risk.

A: Obligations rated A are judged to be upper-medium grade and are subject to low credit risk.

Baa: Obligations rated Baa are judged to be medium-grade and subject to moderate credit risk and as such may possess certain speculative characteristics.

Ba: Obligations rated Ba are judged to be speculative and are subject to substantial credit risk.

B: Obligations rated B are considered speculative and are subject to high credit risk.

Caa: Obligations rated Caa are judged to be speculative of poor standing and are subject to very high credit risk.

Ca: Obligations rated Ca are highly speculative and are likely in, or very near, default, with some prospect of recovery of principal and interest.

C: Obligations rated C are the lowest rated and are typically in default, with little prospect for recovery of principal or interest.

Note: Moody's appends numerical modifiers 1, 2, and 3 to each generic rating classification from Aa through Caa. The modifier 1 indicates that the obligation ranks in the higher end of its generic rating category; the modifier 2 indicates a mid-range ranking; and the modifier 3 indicates a ranking in the lower end of that generic rating category. Additionally, a “(hyb)” indicator is appended to all ratings of hybrid securities issued by banks, insurers, finance companies, and securities firms.*

By their terms, hybrid securities allow for the omission of scheduled dividends, interest, or principal payments, which can potentially result in impairment if such an omission occurs. Hybrid securities may also be subject to contractually allowable write-downs of principal that could result in impairment. Together with the hybrid indicator, the long-term obligation rating assigned to a hybrid security is an expression of the relative credit risk associated with that security.

GLOBAL SHORT-TERM RATING SCALE

Ratings assigned on Moody's global short-term rating scale are forward-looking opinions of the relative credit risks of financial obligations issued by non-financial corporates, financial institutions, structured finance vehicles, project finance vehicles, and public sector entities. Short-term ratings are assigned to obligations with an original maturity of thirteen months or less and reflect both on the likelihood of a default on contractually promised payments and the expected financial loss suffered in the event of default.

P-1: Ratings of Prime-1 reflect a superior ability to repay short-term obligations.

P-2: Ratings of Prime-2 reflect a strong ability to repay short-term obligations.

P-3: Ratings of Prime-3 reflect an acceptable ability to repay short-term obligations.

NP: Issuers (or supporting institutions) rated Not Prime do not fall within any of the Prime rating categories.

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S&P GLOBAL RATINGS (“S&P”)

ISSUE CREDIT RATING DEFINITIONS

An S&P Global Ratings issue credit rating is a forward-looking opinion about the creditworthiness of an obligor with respect to a specific financial obligation, a specific class of financial obligations, or a specific financial program (including ratings on medium-term note programs and commercial paper programs). It takes into consideration the creditworthiness of guarantors, insurers, or other forms of credit enhancement on the obligation and takes into account the currency in which the obligation is denominated. The opinion reflects S&P Global Ratings' view of the obligor's capacity and willingness to meet its financial commitments as they come due, and this opinion may assess terms, such as collateral security and subordination, which could affect ultimate payment in the event of default.

Issue credit ratings can be either long-term or short-term. Short-term ratings are generally assigned to those obligations considered short-term in the relevant market. Short-term ratings are also used to indicate the creditworthiness of an obligor with respect to put features on long-term obligations. Medium-term notes are assigned long-term ratings.

LONG-TERM ISSUE CREDIT RATINGS*

AAA: An obligation rated ‘AAA' has the highest rating assigned by S&P Global Ratings. The obligor's capacity to meet its financial commitments on the obligation is extremely strong.

AA: An obligation rated ‘AA' differs from the highest-rated obligations only to a small degree. The obligor's capacity to meet its financial commitments on the obligation is very strong.

A: An obligation rated ‘A' is somewhat more susceptible to the adverse effects of changes in circumstances and economic conditions than obligations in higher-rated categories. However, the obligor's capacity to meet its financial commitments on the obligation is still strong.

BBB: An obligation rated ‘BBB' exhibits adequate protection parameters. However, adverse economic conditions or changing circumstances are more likely to weaken the obligor's capacity to meet its financial commitments on the obligation.

BB; B; CCC; CC; and C: Obligations rated ‘BB', ‘B', ‘CCC', ‘CC', and ‘C' are regarded as having significant speculative characteristics. ‘BB' indicates the least degree of speculation and ‘C' the highest. While such obligations will likely have some quality and protective characteristics, these may be outweighed by large uncertainties or major exposure to adverse conditions.

BB: An obligation rated ‘BB' is less vulnerable to nonpayment than other speculative issues. However, it faces major ongoing uncertainties or exposure to adverse business, financial, or economic conditions that could lead to the obligor's inadequate capacity to meet its financial commitments on the obligation.

B: An obligation rated ‘B' is more vulnerable to nonpayment than obligations rated ‘BB', but the obligor currently has the capacity to meet its financial commitments on the obligation. Adverse business, financial, or economic conditions will likely impair the obligor's capacity or willingness to meet its financial commitments on the obligation.

CCC: An obligation rated ‘CCC' is currently vulnerable to nonpayment, and is dependent upon favorable business, financial, and economic conditions for the obligor to meet its financial commitments on the obligation. In the event of adverse business, financial, or economic conditions, the obligor is not likely to have the capacity to meet its financial commitments on the obligation.

CC: An obligation rated ‘CC' is currently highly vulnerable to nonpayment. The ‘CC' rating is used when a default has not yet occurred, but S&P Global Ratings expects default to be a virtual certainty, regardless of the anticipated time to default.

C: An obligation rated ‘C' is currently highly vulnerable to nonpayment, and the obligation is expected to have lower relative seniority or lower ultimate recovery compared with obligations that are rated higher.

D: An obligation rated ‘D' is in default or in breach of an imputed promise. For non-hybrid capital instruments, the ‘D' rating category is used when payments on an obligation are not made on the date due, unless S&P Global Ratings believes that such payments will be made within five business days in the absence of a stated grace period or within the earlier of the stated grace period or 30 calendar days. The ‘D' rating also will be used upon the filing of a bankruptcy petition or the taking of similar action and where default on an obligation is a virtual certainty, for example due to automatic stay provisions. A rating on an obligation is lowered to 'D' if it is subject to a distressed debt restructuring.

NR: This indicates that a rating has not been assigned or is no longer assigned.

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Ratings from 'AA' to 'CCC' may be modified by the addition of a plus (+) or minus (-) sign to show relative standing within the rating categories.

SHORT-TERM ISSUE CREDIT RATINGS

A-1: A short-term obligation rated ‘A-1' is rated in the highest category by S&P Global Ratings. The obligor's capacity to meet its financial commitments on the obligation is strong. Within this category, certain obligations are designated with a plus sign (+). This indicates that the obligor's capacity to meet its financial commitments on these obligations is extremely strong.

A-2: A short-term obligation rated ‘A-2' is somewhat more susceptible to the adverse effects of changes in circumstances and economic conditions than obligations in higher rating categories. However, the obligor's capacity to meet its financial commitments on the obligation is satisfactory.

A-3: A short-term obligation rated ‘A-3' exhibits adequate protection parameters. However, adverse economic conditions or changing circumstances are more likely to weaken an obligor's capacity to meet its financial commitments on the obligation.

B: A short-term obligation rated ‘B' is regarded as vulnerable and has significant speculative characteristics. The obligor currently has the capacity to meet its financial commitments; however, it faces major ongoing uncertainties that could lead to the obligor's inadequate capacity to meet its financial commitments.

C: A short-term obligation rated ‘C' is currently vulnerable to nonpayment and is dependent upon favorable business, financial, and economic conditions for the obligor to meet its financial commitments on the obligation.

D: A short-term obligation rated ‘D' is in default or in breach of an imputed promise. For non-hybrid capital instruments, the ‘D' rating category is used when payments on an obligation are not made on the date due, unless S&P Global Ratings believes that such payments will be made within any stated grace period. However, any stated grace period longer than five business days will be treated as five business days. The ‘D' rating also will be used upon the filing of a bankruptcy petition or the taking of a similar action and where default on an obligation is a virtual certainty, for example due to automatic stay provisions. An obligation's rating is lowered to ‘D' if it is subject to a distressed exchange offer.

FITCH RATINGS. (“FITCH”)

ISSUER DEFAULT RATINGS

Rated entities in a number of sectors, including financial and non-financial corporations, sovereigns, insurance companies and certain sectors within public finance, are generally assigned Issuer Default Ratings (IDRs). IDRs are also assigned to certain entities in global infrastructure and project finance. IDRs opine on an entity's relative vulnerability to default on financial obligations. The threshold default risk addressed by the IDR is generally that of the financial obligations whose non-payment would best reflect the uncured failure of that entity. As such, IDRs also address relative vulnerability to bankruptcy, administrative receivership or similar concepts.

In aggregate, IDRs provide an ordinal ranking of issuers based on the agency's view of their relative vulnerability to default, rather than a prediction of a specific percentage likelihood of default.

AAA: Highest credit quality.

‘AAA' ratings denote the lowest expectation of default risk. They are assigned only in cases of exceptionally strong capacity for payment of financial commitments. This capacity is highly unlikely to be adversely affected by foreseeable events.

AA: Very high credit quality.

‘AA' ratings denote expectations of very low default risk. They indicate very strong capacity for payment of financial commitments. This capacity is not significantly vulnerable to foreseeable events.

A: High credit quality.

‘A' ratings denote expectations of low default risk. The capacity for payment of financial commitments is considered strong. This capacity may, nevertheless, be more vulnerable to adverse business or economic conditions than is the case for higher ratings.

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BBB: Good credit quality.

‘BBB' ratings indicate that expectations of default risk are currently low. The capacity for payment of financial commitments is considered adequate, but adverse business or economic conditions are more likely to impair this capacity.

BB: Speculative.

‘BB' ratings indicate an elevated vulnerability to default risk, particularly in the event of adverse changes in business or economic conditions over time; however, business or financial flexibility exists that supports the servicing of financial commitments.

B: Highly speculative.

‘B' ratings indicate that material default risk is present, but a limited margin of safety remains. Financial commitments are currently being met; however, capacity for continued payment is vulnerable to deterioration in the business and economic environment.

CCC: Substantial credit risk.

Very low margin for safety. Default is a real possibility.

CC: Very high levels of credit risk.

Default of some kind appears probable.

C: Near default

A default or default-like process has begun, or the issuer is in standstill, or for a closed funding vehicle, payment capacity is irrevocably impaired. Conditions that are indicative of a ‘C' category rating for an issuer include:

the issuer has entered into a grace or cure period following non-payment of a material financial obligation;

the issuer has entered into a temporary negotiated waiver or standstill agreement following a payment default on a material financial obligation;

the formal announcement by the issuer or their agent of a distressed debt exchange;

a closed financing vehicle where payment capacity is irrevocably impaired such that it is not expected to pay interest and/or principal in full during the life of the transaction, but where no payment default is imminent.

RD: Restricted default.

‘RD' ratings indicate an issuer that in Fitch's opinion has experienced:

an uncured payment default or distressed debt exchange on a bond, loan or other material financial obligation, but

has not entered into bankruptcy filings, administration, receivership, liquidation, or other formal winding-up procedure, and

has not otherwise ceased operating.

This would include:

the selective payment default on a specific class or currency of debt;

ii.

the uncured expiry of any applicable grace period, cure period or default forbearance period following a payment default on a bank loan, capital markets security or other material financial obligation;

iii.

the extension of multiple waivers or forbearance periods upon a payment default on one or more material financial obligations, either in series or in parallel; ordinary execution of a distressed debt exchange on one or more material financial obligations.

D: Default.

‘D' ratings indicate an issuer that in Fitch's opinion has entered into bankruptcy filings, administration, receivership, liquidation or other formal winding-up procedure or that has otherwise ceased business.

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Default ratings are not assigned prospectively to entities or their obligations; within this context, non-payment on an instrument that contains a deferral feature or grace period will generally not be considered a default until after the expiration of the deferral or grace period, unless a default is otherwise driven by bankruptcy or other similar circumstance, or by a distressed debt exchange.

In all cases, the assignment of a default rating reflects the agency's opinion as to the most appropriate rating category consistent with the rest of its universe of ratings and may differ from the definition of default under the terms of an issuer's financial obligations or local commercial practice.

SHORT-TERM RATINGS ASSIGNED TO ISSUERS AND OBLIGATIONS

A short-term issuer or obligation rating is based in all cases on the short-term vulnerability to default of the rated entity and relates to the capacity to meet financial obligations in accordance with the documentation governing the relevant obligation. Short-term deposit ratings may be adjusted for loss severity. Short-Term Ratings are assigned to obligations whose initial maturity is viewed as “short term” based on market convention. Typically, this means up to 13 months for corporate, sovereign, and structured obligations and up to 36 months for obligations in U.S. public finance markets.

F1: Highest Short-Term Credit Quality. Indicates the strongest intrinsic capacity for timely payment of financial commitments; may have an added “+” to denote any exceptionally strong credit feature.

F2: Good Short-Term Credit Quality. Good intrinsic capacity for timely payment of financial commitments.

F3: Fair Short-Term Credit Quality. The intrinsic capacity for timely payment of financial commitments is adequate.

B: Speculative Short-Term Credit Quality. Minimal capacity for timely payment of financial commitments, plus heightened vulnerability to near term adverse changes in financial and economic conditions.

C: High Short-Term Default risk. Default is a real possibility.

RD: Restricted Default. Indicates an entity that has defaulted on one or more of its financial commitments, although it continues to meet other financial obligations. Typically applicable to entity ratings only.

D: Default. Indicates a broad-based default event for an entity, or the default of a short-term obligation.

Note: The modifiers “+” or “-” may be appended to a rating to denote relative status within major rating categories. For example, the rating category ‘AA' has three notch-specific rating levels (‘AA+'; ‘AA'; ‘AA-'; each a rating level). Such suffixes are not added to ‘AAA' ratings and ratings below the 'CCC' category. For the short-term rating category of ‘F1', a ‘+' may be appended. For Viability Ratings, the modifiers “+” or “–” may be appended to a rating to denote relative status within categories from ‘AA' to ‘CCC'. For derivative counterparty ratings the modifiers “+” or “–” may be appended to the ratings within ‘AA(dcr)' to ‘CCC(dcr)' categories.

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APPENDIX B – TRUST'S PROXY VOTING POLICY AND PROCEDURES

SSGA FUNDS
STATE STREET MASTER FUNDS
STATE STREET INSTITUTIONAL INVESTMENT TRUST
ELFUN GOVERNMENT MONEY MARKET FUND
ELFUN TAX-EXEMPT INCOME FUND
ELFUN INCOME FUND
ELFUN DIVERSIFIED FUND
ELFUN INTERNATIONAL EQUITY FUND
ELFUN TRUSTS
STATE STREET NAVIGATOR SECURITIES LENDING TRUST
STATE STREET INSTITUTIONAL FUNDS
STATE STREET VARIABLE INSURANCE SERIES FUNDS, INC. (THE “COMPANY”)1

PROXY VOTING POLICY AND PROCEDURES

As of September 20, 2017

The Board of Trustees/Directors of the Trust/Company (each series thereof, a “Fund”) have adopted the following policy and procedures with respect to voting proxies relating to portfolio securities held by the Trust/Company's investment portfolios.

1. Proxy Voting Policy

The policy of the Trust/Company is to delegate the responsibility for voting proxies relating to portfolio securities held by the Trust/Company to SSGA Funds Management, Inc., the Trust/Company's investment adviser (the “Adviser”), subject to the Trustees/Directors' continuing oversight.

2. Fiduciary Duty

The right to vote proxies with respect to a portfolio security held by the Trust/Company is an asset of the Trust/Company. The Adviser acts as a fiduciary of the Trust/Company and must vote proxies in a manner consistent with the best interest of the Trust/Company and its shareholders.

3. Proxy Voting Procedures

A. At least annually, the Adviser shall present to the Boards of Trustees/Directors its policies, procedures and other guidelines for voting proxies (“Policy”) and the policy of any Sub-adviser (as defined below) to which proxy voting authority has been delegated (see Section 9 below). In addition, the Adviser shall notify the Trustees/Directors of material changes to its Policy or the policy of any Sub-adviser promptly and not later than the next regular meeting of the Board of Trustees/Directors after such amendment is implemented.

B. At least annually, the Adviser shall present to the Boards of Trustees/Directors its policy for managing conflicts of interests that may arise through the Adviser's proxy voting activities. In addition, the Adviser shall report any Policy overrides involving portfolio securities held by a Fund to the Trustees/Directors at the next regular meeting of the Board of Trustees/Directors after such override(s) occur.

C. At least annually, the Adviser shall inform the Trustees/Director that a record is available with respect to each proxy voted with respect to portfolio securities of the Trust/Company during the year. Also see Section 5 below.

4. Revocation of Authority to Vote

The delegation by the Trustees/Directors of the authority to vote proxies relating to portfolio securities of the Trust/Company may be revoked by the Trustees/Directors, in whole or in part, at any time.

____________

Unless otherwise noted, the singular term “Trust/Company” used throughout this document means each of SSGA Funds, State Street Master Funds, State Street Institutional Investment Trust, State Street Navigator Securities Lending Trust, Elfun Government Money Market Fund, Elfun Tax-Exempt Income Fund, Elfun Income Fund, Elfun Diversified Fund, Elfun International Equity Fund, Elfun Trusts, State Street Institutional Funds, and State Street Variable Insurance Series Funds, Inc.

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5. Annual Filing of Proxy Voting Record

The Adviser shall provide the required data for each proxy voted with respect to portfolio securities of the Trust/Company to the Trust/Company or its designated service provider in a timely manner and in a format acceptable to be filed in the Trust/Company's annual proxy voting report on Form N-PX for the twelve-month period ended June 30. Form N-PX is required to be filed not later than August 31 of each year.

6. Retention and Oversight of Proxy Advisory Firms

A. In considering whether to retain or continue retaining a particular proxy advisory firm, the Adviser will ascertain whether the proxy advisory firm has the capacity and competency to adequately analyze proxy issues, act as proxy voting agent as requested, and implement the Policy. In this regard, the Adviser will consider, at least annually, among other things, the adequacy and quality of the proxy advisory firm's staffing and personnel and the robustness of its policies and procedures regarding its ability to identify and address any conflicts of interest. The Adviser shall, at least annually, report to Boards of Trustees/Directors regarding the results of this review.

B. The Adviser will request quarterly and annual reporting from any proxy advisory firm retained by the Adviser, and hold ad hoc meetings with such proxy advisory firm, in order to determine whether there has been any business changes that might impact the proxy advisory firm's capacity or competency to provide proxy voting advice or services or changes to the proxy advisory firm's conflicts policies or procedures. The Adviser will also take reasonable steps to investigate any material factual error, notified to the Adviser by the proxy advisory firm or identified by the Adviser, made by the proxy advisory firm in providing proxy voting services.

7. Periodic Sampling

The Adviser will periodically sample proxy votes to review whether they complied with the Policy. The Adviser shall, at least annually, report to the Boards of Trustees/Directors regarding the frequency and results of the sampling performed.

8. Disclosures

The Trust/Company shall include in its registration statement:

1. A description of this policy and of the policies and procedures used by the Adviser to determine how to vote proxies relating to portfolio securities; and

2. A statement disclosing that information regarding how the Trust/Company voted proxies relating to portfolio securities during the most recent twelve-month period ended June 30 is available without charge, upon request, by calling the Trust/Company's toll-free telephone number; or through a specified Internet address; or both; and on the Securities and Exchange Commission's (the “SEC”) website.

The Trust/Company shall include in its Form N-CSR filings to shareholders:

1. A statement disclosing that a description of the policies and procedures used by or on behalf of the Trust/Company to determine how to vote proxies relating to portfolio securities of the Funds is available without charge, upon request, by calling the Trust/Company's toll-free telephone number; through a specified Internet address, if applicable; and on the SEC's website; and

9. Sub-Advisers

For certain Funds, the Adviser may retain investment management firms (“Sub-advisers”) to provide day-to-day investment management services to the Funds pursuant to sub-advisory agreements. It is the policy of the Trust/Company that the Adviser may delegate proxy voting authority with respect to a Fund to a Sub-adviser. Pursuant to such delegation, a Sub-adviser is authorized to vote proxies on behalf of the applicable Fund or Funds for which it serves as sub-adviser, in accordance with the Sub-adviser's proxy voting policies and procedures.

10. Review of Policy

The Trustees/Directors shall review this policy to determine its continued sufficiency as necessary from time to time.

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APPENDIX C – ADVISER'S PROXY VOTING PROCEDURES AND GUIDELINES

Adviser's Proxy Voting Policies and Procedures

March 2025

Global Proxy Voting and Engagement Policy

State Street Global Advisors is the investment management arm of State Street Corporation, a leading provider of financial services to institutional investors. As an asset manager, State Street Global Advisors votes its clients' proxies where the client has delegated proxy voting authority to it, and State Street Global Advisors votes these proxies and engages with companies in the manner that we believe will most likely protect and promote the long-term economic value of client investments, as described in this document.1

When engaging with and voting proxies with respect to the portfolio companies in which we invest our clients' assets, we do so on behalf of and in the best interests of the client accounts we manage and do not seek to change or influence control of any such portfolio companies. The State Street Global Advisors Global Proxy Voting and Engagement Policy (the “Policy”) contains certain policies that State Street Global Advisors will only apply in jurisdictions where permitted by local law and regulations. State Street Global Advisors will not apply any policies contained herein in any jurisdictions where State Street Global Advisors believes that implementing or following such policies would be deemed to constitute seeking to change or influence control of a portfolio company.

Introduction

At State Street Global Advisors, we take our fiduciary duties as an asset manager very seriously. Our primary fiduciary obligation to our clients is to maximize the long-term value of their investments. State Street Global Advisors focuses on risks and opportunities that may impact long-term value creation for our clients. We rely on the elected representatives of the companies in which we invest — the board of directors — to oversee these firms' strategies. We expect effective independent board oversight of the material risks and opportunities to a firm's business and operations. We believe that appropriate consideration of these risks and opportunities is an essential component of a firm's long-term business strategy, and expect boards to actively oversee the management of this strategy.

Our Asset Stewardship Program

State Street Global Advisors' Asset Stewardship Team is responsible for developing and implementing this Policy, the implementation of third-party proxy voting guidelines where applicable, case-by-case voting items, issuer engagement activities, and research and analysis of corporate governance issues and proxy voting items. The Asset Stewardship Team's activities are overseen by our internal governance body, State Street Global Advisors' Global Fiduciary and Conduct Committee (“GFCC”). The GFCC is responsible for reviewing State Street Global Advisors' stewardship strategy, engagement priorities, the Policy, and for monitoring the delivery of voting objectives.

In order to facilitate the execution of our proxy votes, we retain Institutional Shareholder Services Inc. (“ISS”). We utilize ISS to: (1) act as our proxy voting agent (providing State Street Global Advisors with vote execution and administration services), (2) assist in applying the Policy, and (3) provide research and analysis relating to general corporate governance issues and specific proxy items. State Street Global Advisors does not follow the voting recommendations of any policy offered by ISS or any other proxy voting policy provider in implementing the Policy.

All voting decisions and engagement activities for which State Street Global Advisors has been given voting discretion are undertaken in accordance with this Policy, ensuring that the interests of our clients remain the sole consideration when discharging our stewardship responsibilities. Exceptions to this policy include the use of an independent third party to vote on State Street Corporation (“State Street”) stock and the stock of other State Street affiliated entities, to mitigate a

This Policy is applicable to SSGA Funds Management, Inc., State Street Global Advisors Trust Company, and other investment advisory affiliates of State Street Corporation.

C-1

conflict of interest of voting on our parent company or affiliated entities, and other situations where we believe we may be conflicted from voting (for example, stock of a public company for which a State Street director also serves as a director, or due to an outside business interest). In such cases, delegated third parties exercise vote decisions based on their independent voting policy.

We aim to vote at all shareholder meetings where our clients have given us the authority to vote their shares and where it is feasible to do so. However, when we deem appropriate, we may refrain from voting at meetings in cases where:

•Power of attorney documentation is required.

•Voting would have a material impact on our ability to trade the security.

•Voting is not permissible due to sanctions affecting a company or individual.

•Issuer-specific special documentation is required or various market or issuer certifications are required.

•Certain market limitations would prohibit voting (e.g., partial/split voting prohibitions or residency restrictions).

•Unless a client directs otherwise in so-called “share blocking” markets (markets where proxy voters have their securities blocked from trading during the period of the annual meeting).

Additionally, we are unable to vote proxies when certain custodians used by our clients do not offer proxy voting in a jurisdiction or when they charge a meeting-specific fee in excess of the typical custody service agreement.

Voting authority attached to certain securities held by State Street Global Advisors pooled funds may be delegated to an independent third party as required by regulatory or other requirements. Under such arrangements, voting will be conducted by the independent third party pursuant to its proxy voting policy and not pursuant to this Policy.

The State Street Global Advisors Proxy Voting Choice Program

In addition to the option of delegating proxy voting authority to State Street Global Advisors pursuant to this Policy, clients may alternatively choose to participate in the State Street Global Advisors Proxy Voting Choice Program (the “Proxy Voting Choice Program”), which empowers clients to direct the proxy voting of shares held by the eligible fund or segregated account they own. Clients that participate in the Proxy Voting Choice Program have the option of selecting a third-party proxy voting guideline from the policies included in the Proxy Voting Choice Program to apply to the vote of the client's pro rata share of the securities held by the eligible fund or segregated account they own. This Policy does not apply to shares voted under the Proxy Voting Choice Program.

Securities Not Voted Pursuant to the Policy

Where clients have asked State Street Global Advisors to vote the client's shares on their behalf, including where a pooled fund fiduciary has delegated the responsibility to vote the fund's securities to State Street Global Advisors, State Street Global Advisors votes those securities in a unified manner, consistent with the principles described in this Policy. Exceptions to this unified voting policy are: (1) where State Street Global Advisors has made its Proxy Voting Choice Program available to its separately managed account clients and investors within a fund managed by State Street Global Advisors, in which case a pro rata portion of shares held by the fund or segregated account attributable to clients who choose to participate in the Proxy Voting Choice Program will be voted consistent with the third-party proxy voting guidelines selected by the clients, (2) where a pooled investment vehicle managed by State Street Global Advisors utilizes a third party proxy voting guideline as set forth in that fund's organizational and/or offering documents, and (3) where voting authority with respect to certain securities held by State Street Global Advisors pooled funds may be delegated to an independent third party as required by regulatory or other requirements. With respect to such funds and separately managed accounts utilizing third-party proxy voting guidelines, the terms of the applicable third-party proxy voting guidelines shall apply in place of the Policy described herein and the proxy votes implemented with respect to such a fund or account may differ from and be contrary to the votes implemented for other portfolios managed by State Street Global Advisors pursuant to this Policy.

Regional Nuances

When voting and engaging with companies, we may consider market-specific nuances that may be relevant to that company. We expect companies to observe the relevant laws and regulations of their respective markets, as well as country-specific best practice guidelines and corporate governance codes, and to publicly disclose their level of compliance with the applicable provisions and requirements. Except where specified, this Policy applies globally.

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Our Proxy Voting and Engagement Principles

State Street Global Advisors' proxy voting and engagement program focuses on three broad principles:

Effective Board Oversight: We believe that well-governed companies can protect and pursue shareholder interests better and withstand the challenges of an uncertain economic environment. Principally, a board acts on behalf of shareholders by protecting their interests and preserving their rights. In order to carry out their primary responsibilities, directors undertake activities that include setting strategy and providing guidance on strategic matters, selecting the CEO and other senior executives, overseeing executive management, creating a succession plan for the board and management, and providing effective oversight of material risks and opportunities relevant to their business. Further, good corporate governance necessitates the existence of effective internal controls and risk management systems, which should be governed by the board.
We view board quality as a measure of director independence, director succession planning, board diversity, evaluations and refreshment, and company governance practices. We believe independent directors are crucial to good corporate governance; they help management establish sound corporate governance policies and practices. We believe a sufficiently independent board is key to effectively monitoring management, maintaining appropriate governance practices, and performing oversight functions necessary to protect shareholder interests. We also believe the right mix of skills, independence, diversity, and qualifications among directors provides boards with the knowledge and experience to manage risks and operating structures that are often complex and industry-specific.

Disclosure: It is important for shareholders to receive timely and accurate reporting of a company's financial performance and strategy so that they are able to assess both the value and risk of their investment. In addition to information related to strategy and performance, companies should also provide disclosure relating to their approach to corporate governance and shareholder rights. Such information allows investors to determine whether their economic interests have been safeguarded by the board and provides insights into the quality of the board's oversight of management. Ultimately, the board of directors is accountable for the oversight and disclosure of the material risks and opportunities faced by the company.

Shareholder Protection: State Street Global Advisors believes it is in the best interest of shareholders for companies to have appropriate shareholder rights and accountability mechanisms in place. As a starting place for voting rights, it is necessary for ownership rights to reflect one vote for one share to ensure that economic interests and proxy voting power are aligned. This share structure best supports the shareholders' right to exercise their proxy vote on matters that are important to the protection of their investment, such as share issuances and other dilutive events, authorization of strategic transactions, approval of a shareholder rights plan, and changes to the corporate bylaws or charter, among others. In terms of accountability to shareholders and appropriate checks and balances, we believe there should be annual elections of the full board of directors.

Application of Principles

These three principles of effective board oversight, disclosure and shareholder protection apply across all of State Street Global Advisors' proxy voting decisions. When voting at portfolio companies in different markets, State Street Global Advisors may apply the principles in ways that are specific to a given market based on factors such as availability of data, resources, disclosure practices, and size of holdings in our clients' accounts.

Shareholder Proposals

When voting our clients' proxies, we may be presented with shareholder proposals at portfolio companies that must be evaluated on a case-by-case basis and in accordance with the principles set forth above. For proposals related to commonly requested disclosure topics, we have developed the criteria found in Appendix A to assess the effectiveness of disclosure on such topics in connection with these types of proposals.

Engagement

We conduct engagements with individual issuers to communicate the principles set forth in this Policy and to learn more about companies' strategy, board oversight and disclosure practices. We do not seek to change or influence control of any portfolio company through these engagements. In addition, we encourage issuers to increase the amount of direct communication board members have with shareholders. We believe direct communication with executive board members and independent non- executive directors is critical to helping companies understand shareholder concerns.

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Section I. Effective Board Oversight

Director Independence

We believe independent directors are crucial to good corporate governance; they help management establish sound corporate governance policies and practices. We have developed criteria for determining director independence, which vary by region and/or local jurisdiction. These criteria generally follow relevant listing standards, local regulatory requirements and/or local market practice standards. Such criteria may include:

•Participation in related-party transactions or other material business relations with the company

•Employment history with the company

•Status as founder or member of the founding family

•Government representative

•Excessive tenure and preponderance of long-tenured directors

•Relations with significant shareholders

•Close family ties with any of the company's advisers, directors or senior employees

•Cross-directorships

•Receipt of non-board related compensation from the issuer, its auditors or advisors

•Company's own classification of a director as non-independent

In some cases, State Street Global Advisors' criteria may be more rigorous than applicable local or listing requirements.

Majority Independent Board

We believe a sufficiently independent board is key to effectively monitoring management, maintaining appropriate governance practices, and performing oversight functions necessary to protect shareholder interests.

Separation of Chair/CEO

Our primary focus is to ensure there is strong independent leadership of the board, in accordance with the principles discussed above. We generally believe the board is best placed to choose the governance structure that is most appropriate for that company.

Board Committees

We believe that board committees are crucial to robust corporate governance and should be composed of a sufficient number of independent directors. We use the same criteria for determining committee independence as we do for determining director independence, which varies by region and/or local jurisdiction. Although we recognize that board structures may vary by jurisdiction, where a board has established an audit committee and/or compensation/remuneration committee, we generally expect the committee to be primarily, and in some cases, fully independent.

Refreshment and Tenure

We believe that average board tenure should generally align with the length of the business cycle of the respective industry in which a company operates. In assessing excessive tenure, we consider factors such as the preponderance of long tenured directors, board refreshment practices, classified board structures and the business cycle for the industry in which a company operates.

Director Time Commitments

We believe a company's nominating committee is best placed to determine appropriate time commitments for the company's directors. We consider if a company publicly discloses its director time commitment policy (e.g., within corporate governance guidelines, proxy statement, annual report, company website, etc.) and if this policy or associated disclosure outlines the factors that the nominating committee considers to assess director time commitments during the annual policy review process.

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Board Composition

We believe effective board oversight of a company's long-term business strategy necessitates a diversity of backgrounds, experiences, and perspectives, which may include a range of characteristics such as skills, gender, race, ethnicity, and age. By having a critical mass of diverse perspectives, boards could experience the benefits that may lead to innovative ideas and foster more robust conversations about a company's strategy.

We recognize that many factors may influence board composition, including board size, geographic location, and local regulations, among others. Further, we believe that a robust nominating and governance process is essential to achieving a board composition that is designed to facilitate effective, independent oversight of a company's long-term strategy. We believe nominating committees are best placed to determine the most effective board composition and we encourage companies to ensure that there are sufficient levels of diverse experiences and perspectives represented in the boardroom.

Board Expertise

We believe board members should have adequate skills to provide effective oversight of corporate strategy, operations, and risks, including sustainability-related issues.

Boards should also have a regular evaluation process in place to assess the effectiveness of the board and the skills of board members to address issues, such as emerging risks, changes to corporate strategy, and diversification of operations and geographic footprint. We believe nominating committees are best positioned to evaluate the skillset and expertise of both existing and prospective board members. However, we may take such considerations into account in certain circumstances.

Board Accountability

Oversight of Strategy and Risk
We believe that risk management is a key function of the board, which is responsible for setting the overall risk appetite of a company and for providing oversight on the risk management process established by senior executives at a company. We allow boards to have discretion regarding the ways in which they provide oversight in this area. However, we expect companies to disclose how the board provides oversight of its risk management system and risk identification. Boards should also review existing and emerging risks that evolve in tandem with the changing political and economic landscape or as companies diversify or expand their operations into new areas.

As responsible stewards, we believe in the importance of effective risk management and oversight of issues that are material to a company. To effectively manage and assess the risk of our clients' portfolios, we expect our portfolio companies to manage risks and opportunities that are material and industry-specific and that have a demonstrated link to long-term value creation, and to provide high-quality disclosure of this process to shareholders.

When evaluating a board's oversight of risks and opportunities, we assess the following factors, based on disclosures by, and engagements with, portfolio companies:

Oversees Long-term Strategy

–Articulates the material risks and opportunities and how those risks and opportunities fit into the firm's long-term business strategy

–Regularly assesses the effectiveness of the company's long-term strategy, and management's execution of this strategy

Demonstrates an Effective Oversight Process

–Describes which committee(s) have oversight over specific risks and opportunities, as well as which topics are overseen and/or discussed at the full-board level

–Includes risks and opportunities in board and/or committee agendas, and articulates how often specific topics are discussed at the committee and/or full- board level

–Utilizes KPIs or metrics to assess the effectiveness of risk management processes

–Engages with key stakeholders including employees and investors

Ensures Effective Leadership

–Holds management accountable for progress on relevant metrics and targets

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–Integrates necessary skills and perspectives into the board nominating and executive hiring processes, and provides training to directors and executives on topics material to the company's business or operations

–Conducts a periodic effectiveness review

Ensures Disclosures of Material Information

–Ensures publication of relevant disclosures, including those regarding material topics

Compliance with Corporate Governance Principles
Our minimum expectation is that companies will comply with their respective market governance codes and/or stewardship principles. Issuers are encouraged to provide explanations of their level of compliance with their local market code and why their preferred governance structure (if not compliant with the code) serves shareholders' long-term interests.

We will review governance practices at companies in selected indexes for their adherence to market governance codes and/or stewardship principles.

Proxy Contests
We believe nominating committees that are comprised of independent directors are best placed to assess which individuals are adequately equipped with the skills and expertise to fulfill the duties of board members, and to act as effective fiduciaries.

While our default position is to support the committees' judgement, we consider the following factors when evaluating dissident nominees:

•Strategy presented by dissident nominees versus that of current management, as overseen by the incumbent board

•Effectiveness, quality, and experience of the management slate

•Material governance failures and the level of responsiveness to shareholder concerns and market signals by the incumbent board

•Quality of disclosure and engagement practices to support changes to shareholder rights, capital allocation and/or governance structure

•Company performance and, if applicable, the merit of a recovery plan

•Expertise of board members with respect to company industry and strategy

Board Oversight of Geopolitical Risk
As stewards of our clients' assets, we are aware of the financial risks associated with geopolitical risk, including risks arising from unexpected conflict between or among nations. We expect portfolio companies that may be impacted by geopolitical risk to:

•Manage and mitigate risks related to operating in impacted markets, which may include financial, sanctions-related, regulatory, and/or reputational risks, among others;

•Strengthen board oversight of these efforts; and

•Describe these efforts in public disclosures.

Compensation and Remuneration
We consider it the board's responsibility to determine the appropriate level of executive compensation. Despite the differences among the possible types of plans and awards, there is a simple underlying philosophy that guides our analysis of executive compensation: we believe that there should be a direct relationship between executive compensation and company performance over the long term.

Shareholders should have the opportunity to assess whether pay structures and levels are aligned with business performance. When assessing remuneration reports, we consider factors such as adequate disclosure of various remuneration elements, absolute and relative pay levels, peer selection and benchmarking, the mix of long-term and short-term incentives, alignment of pay structures with shareholder interests, as well as with corporate strategy and performance.

For example, criteria we may consider include the following:

•Overall quantum relative to company performance

•Vesting periods and length of performance targets

•Mix of performance, time and options-based stock units

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•Use of special grants and one-time awards

•Retesting and repricing features

•Disclosure and transparency

Board Meeting Attendance
We expect directors to attend at least 75 percent of board meetings in the last financial year or provide an appropriate explanation for why they were unable to meet this attendance threshold.

Section II. Disclosure

It is important for shareholders to receive timely and accurate reporting of a company's financial performance and strategy so that they are able to assess both the value and risk of their investment. In addition to information related to strategy and performance, companies should provide disclosure relating to their approach to corporate governance and shareholder rights. Such information allows investors to determine whether their financial interests have been protected by the board and provides insights into the board's oversight of management. Ultimately, the board of directors is accountable for the oversight and disclosure of the material risks and opportunities faced by the company.

Reporting

Financial Statements
We believe the disclosure and availability of reliable financial statements in a timely manner is imperative for investment analysis. We expect external auditors to provide assurance of a company's financial condition.

Sustainability-related Disclosures
We believe in the importance of effective risk management and governance of issues that are material to a company. This may include sustainability-related risks and opportunities where a company has identified such risks and opportunities as material to its business. Such disclosure allows shareholders to effectively assess companies' oversight, strategy, and business practices related to these sustainability issues identified as material.

We look to companies to provide disclosure on sustainability-related risks and opportunities relevant to their businesses in line with applicable local regulatory requirements and any voluntary standards and frameworks adopted by the company.

Climate-related Disclosures
We believe that managing climate-related risks and opportunities is a key element in maximizing long-term risk-adjusted returns for our clients. As a result, we have a longstanding commitment to enhancing investor-useful disclosure related to this topic.

For companies that have identified climate risk as material to their business, we expect the company to provide disclosure on climate-related risks and opportunities relevant to their businesses in line with applicable local regulatory requirements and any voluntary standards and frameworks adopted by the company.

•We encourage the disclosure of Scope 1 and Scope 2 emissions and related targets. However, State Street Global Advisors is not prescriptive in how a company sets its targets. We expect companies that have adopted net zero ambitions to disclose interim climate targets. In each case, if a company chooses not to disclose any climate targets, we expect the company to provide an explanation of how the company measures and monitors progress on managing climate-related risks and opportunities.

•We do not expect any company to set Scope 3 targets. We encourage companies to identify and disclose the most relevant categories of Scope 3 emissions. However, we recognize that Scope 3 emissions estimates have a high degree of uncertainty. Therefore, if a company determines that categories of Scope 3 emissions are impracticable to estimate, we encourage the company to explain the relevant limitations. We also encourage companies to explain any efforts to address Scope 3 emissions, such as engagement with suppliers, customers, or other stakeholders across the value chain, where relevant.

Say-on-Climate Proposals
While we generally believe in the importance of effective disclosure of climate-related risks a company has deemed material to its business, we do not endorse annual advisory climate votes. Where management chooses to include a Say-on-Climate vote, we assess the company's climate-related disclosure in accordance with the criteria listed in Appendix A.

Board and Workforce Demographics
We expect disclosure on the composition of both the board and workforce.

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Section III. Shareholder Protection

Capital

Share Capital Structure
The ability to raise capital is critical for companies to carry out strategy, to grow, and to achieve returns above their cost of capital. The approval of capital raising activities is fundamental to a shareholder's ability to monitor the amounts of proceeds and to ensure capital is deployed efficiently. Altering the capital structure of a company is a critical decision for boards. When making such a decision, we believe the company should disclose a comprehensive business rationale that is consistent with corporate strategy and not overly dilutive to its shareholders.

Our approach to share capital structure matters may vary by local market and jurisdiction, due to regional nuances. Such proposals may include:

•Increase in Authorized Common Shares

•Increase in Authorized Preferred Shares

•Unequal Voting Rights

•Share Repurchase Programs

Dividend Payouts (Japan Only)
For Japanese issuers, we are generally supportive of dividend payouts that constitute 30 percent or more of net income; however we consider whether the payment may damage the company's long-term financial health.

Reorganization, Mergers and Acquisitions
The reorganization of the structure of a company or mergers often involve proposals relating to reincorporation, restructurings, liquidations, and other major changes to the corporation.

We expect proposals to be in the best interests of shareholders, demonstrated by enhancing share value or improving the effectiveness of the company's operations.

We evaluate mergers and structural reorganizations on a case-by-case basis and expect transactions to maximize shareholder value. Some of the considerations include the following:

•Offer premium

•Strategic rationale

•Board oversight of the process for the recommended transaction, including director and/or management conflicts of interest

•Offers made at a premium and where there are no other higher bidders

•Offers in which the secondary market price is substantially lower than the net asset value

We also consider the following:

•Offers with potentially damaging consequences for minority shareholders because of illiquid stock

•Offers where we believe there is a reasonable prospect for an enhanced bid or other bidders

•The current market price of the security exceeds the bid price at the time of voting

Related-Party Transactions
Some companies have a controlled ownership structure and complex cross- shareholdings between subsidiaries and parent companies (“related companies”). Such structures may result in the prevalence of related-party transactions between the company and its various stakeholders, such as directors and management, subsidiaries and shareholders. In markets where shareholders are required to approve such transactions, we expect companies to disclose details of the transaction, such as the nature, the value and the purpose of such a transaction. We also believe independent directors should ratify such transactions. Further, we believe companies should describe the level of independent board oversight and the approval process, including details of any independent valuations provided by financial advisors on related-party transactions.

Cross-Shareholdings (Japan Only)
“Cross-shareholdings” are a long-standing feature of the balance sheets of many Japanese companies, but, in our view, can be detrimental for corporate governance practices and ultimately shareholder returns.

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Shareholder Rights

Proxy Access
In general, we believe that proxy access is a fundamental right and an accountability mechanism for all long-term shareholders. We consider proposals relating to proxy access on a case-by-case basis and consider a balance between providing long-term shareholders accountability while preserving flexibility for management to design a process that is appropriate for the company's circumstances.

Vote Standards

•Annual Elections: We believe the establishment of annual elections of the board of directors is appropriate. We also consider the overall level of board independence and the independence of the key committees, as well as the existence of a shareholder rights plan.

•Majority Voting: We believe a majority vote standard based on votes cast for the election of directors is appropriate.

Shareholder Meetings

•Special Meetings and Written Consent: We believe the ability for shareholders to call special meetings, as well as act by written consent is appropriate. We believe an appropriate threshold for both calling a special meeting and acting by written consent can be 25% of outstanding shares or less.

•Notice Period to Convene a General Meeting: We expect companies to give as much notice as is practicable when calling a general meeting, generally at least 14 days.

•Virtual/Hybrid Shareholder Meetings: We believe the right to hold shareholder meetings in a virtual or hybrid format is appropriate with the following best practices:

–Afford virtual attendee shareholders the same rights as would normally be granted to in-person attendee shareholders

–Commit to time-bound renewal (five years or less) of meeting format authorization by shareholders

–Provide a written record of all questions posed during the meeting, and

–Comply with local market laws and regulations relating to virtual and hybrid shareholder meeting practices

In evaluating these proposals we also consider the operating environment of the company, including local regulatory developments and specific market circumstances impacting virtual meeting practices.

Governance Documents & Miscellaneous Items

Article Amendments
We believe amendments to company bylaws that may negatively impact shareholder rights (such as fee-shifting, forum selection, and exclusion service bylaws) should be put to a shareholder vote.

We believe a majority voting standard is generally appropriate.

We generally believe companies should have a fixed board size, or designate a range for the board size.

Anti-Takeover Issues
Occasionally, companies add anti-takeover provisions that reduce the chances of a potential acquirer to make an offer, or to reduce the likelihood of a successful offer. We generally believe shareholders should have the right to vote on reasonable offers. Our approach to anti-takeover issues may vary by local market and jurisdiction, due to regional nuances.

Accounting and Audit-Related Issues
Companies should have robust internal audit and internal control systems designed for effective management of any potential and emerging risks to company operations and strategy. The responsibility of setting out an internal audit function lies with the audit committee, which should have independent non-executive directors designated as members.

We believe the disclosure and availability of reliable financial statements in a timely manner is imperative for investment analysis. As a result, board oversight of the internal controls and the independence of the audit process are essential if investors are to rely upon financial statements. It is important for the audit committee to appoint external auditors who are independent from management as we expect auditors to provide assurance of a company's financial condition.

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State Street Global Advisors believes that a company's external auditor is an essential feature of an effective and transparent system of external independent assurance. Shareholders should be given the opportunity to vote on their (re-)appointment at the annual meeting. When appointing external auditors and approving audit fees, we will take into consideration the level of detail in company disclosures.

In circumstances where “other” fees include fees related to initial public offerings, bankruptcy emergence, and spin-offs, and the company makes public disclosure of the amount and nature of those fees which are determined to be an exception to the standard “non-audit fee” category, then such fees may be excluded from the non-audit fees considered in determining the ratio of non-audit to audit/audit-related fees/tax compliance and preparation for purposes of determining whether non-audit fees are excessive.

We believe a company should be able to discharge its auditors in the absence of pending litigation, governmental investigation, charges or fraud or other indication of significant concern. Further, we believe that auditors should attend the annual meeting of shareholders.

Indemnification and Liability
Generally, we believe directors should be able to limit their liability and/or expand indemnification and liability protection if a director has not acted in bad faith, gross negligence, or reckless disregard of the duties involved in the conduct of his or her office.

Section IV. Shareholder Proposals

We believe that company boards do right by investors and are responsible for overseeing strategy and company management. Towards that end, we generally do not support shareholder proposals that appear to impose changes to business strategy or operations, such as increasing or decreasing investment in certain products or businesses or phasing out a product or business line or if it is not a topic that the company has deemed to be material in their public disclosure documents.

When assessing shareholder proposals, we fundamentally consider whether the adoption of the resolution would promote long-term shareholder value in the context of our core governance principles:

Effective board oversight

Quality disclosure

Shareholder protection

We will consider supporting a shareholder proposal if:

•the request is focused on enhanced disclosure of the company's governance and/or risk oversight

•the adoption of the request would protect our clients' interests as minority shareholders; or

•for common proposal topics for which we have developed assessment criteria, the extent to which the request satisfies the criteria found in Appendix A.

Section V. Engagement

As a fiduciary, State Street Global Advisors takes a comprehensive approach to engaging with portfolio companies. Our stewardship prioritization process allows us to proactively identify companies for engagement and voting in order to mitigate risks in our client's portfolios. Through engagement, we aim to build long-term relationships with the issuers in which we invest on behalf of our clients and to address a broad range of topics relating to the promotion of long-term shareholder value creation. We do not seek to change or influence control of any portfolio company through engagement.

Equity Engagements

In general, there are three types of engagements that State Street Global Advisors may hold on behalf of equity holders:

Engagements with Portfolio Companies in Connection with a Ballot Item or Other Topic In our Policy: Engagements held with portfolio companies to discuss a ballot item, event or other established topic found in our Policy. Such engagements generally, but not necessarily, occur during “proxy season.” They may be held at the request of State Street Global Advisors or the portfolio company.

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Off-Season Engagement at the Request of a Portfolio Company: From time- to-time, portfolio companies may seek to engage with State Street Global Advisors in the ‘off-season' to discuss a particular topic.

Off-Season Proactive Engagement Campaigns: Each year, State Street Global Advisors will identify thematic engagement campaigns on important topics for which we are seeking more information to potentially inform our future voting positions.

Fixed Income Engagements

From time-to-time, certain corporate action election events, reclassifications or other changes to the investment terms of debt holdings may occur or an issuer may seek to engage with State Street Global Advisors to discuss matters pertaining to the debt instruments that State Street Global Advisors holds on behalf of its clients. In such instances, State Street Global Advisors may engage with the issuer to obtain further information about the matter for purposes of its investment decision making. Such engagements are the responsibility of the Fixed Income portfolio management team, but may be supported by State Street Global Advisors' Asset Stewardship Team. All election decisions are the responsibility of the relevant portfolio management team.

In addition, State Street Global Advisors may identify themes for engagement campaigns with issuers on topics that it believes may affect value of its clients' debt investments. State Street Global Advisors may proactively engage with portfolio companies and other issuers on these topics to help inform our views on the subject.

Where such themes align with those relating to equities, such engagements may be carried out jointly on behalf of both equity and fixed income holdings where there is mutual benefit for both asset classes. Such engagements are led by the State Street Global Advisors Asset Stewardship Team, but may also be attended by the relevant portfolio management teams.

Engaging with Other Investors Soliciting State Street Global Advisors' Votes in Connection with Contested Shareholder Meetings, Vote-No Campaigns, or Shareholder Proposals

While it may be helpful to speak to other investors that are running proxy contests, putting forth vote-no campaigns, or proposing shareholder proposals at investee companies, we limit such discussions to investors who have filed necessary documentation with regulators and engage in these discussions at our own discretion.

Our primary purpose of engaging with investors is:

To gain a better understanding of their position or concerns at investee companies.

In proxy contest situations:

–To assess possible director candidates where investors are seeking board representation in proxy contest situations

–To understand the investor's proposed strategy for the company and investment time horizon to assess their alignment with State Street Global Advisors' views and interests as a long-term shareholder

Any information about our vote decisions are available in this document and on our website. All requests for engagement should be sent to GovernanceTeam@ssga.com.

Section VI. Other Matters

Securities on Loan

As a responsible investor and fiduciary, we recognize the importance of balancing the benefits of voting shares and the incremental lending revenue for the pooled funds that participate in State Street Global Advisors' securities lending program (the “Funds”). Our objective is to recall securities on loan and restrict future lending until after the record date for the respective vote in instances where we believe that a particular vote could have a material impact on the Funds' long-term financial performance and the benefit of voting shares will outweigh the forgone lending income.

Accordingly, we have set systematic recall and lending restriction criteria for shareholder meetings involving situations with the highest potential financial implications (such as proxy contests and strategic transactions including mergers and acquisitions, going dark transactions, change of corporate form, or bankruptcy and liquidation). Generally, these criteria for recall and restriction for lending only apply to certain large cap indices in developed markets.

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State Street Global Advisors monitors the forgone lending revenue associated with each recall to determine if the impact on the Funds' long-term financial performance and the benefit of voting shares will outweigh the forgone lending income.

Although our objective is to systematically recall securities based on the aforementioned criteria, we must receive notice of the vote in sufficient time to recall the shares on or before the record date. When we do not receive timely notice, we may be unable to recall the shares on or before the record date.

Reporting

We provide transparency for our stewardship activities through our regular client reports and relevant information reported online. We publish an annual stewardship report that provides details of our stewardship approach, engagement and voting policies, and activities during the year. The annual stewardship report is complemented by quarterly stewardship activity reports as well as the publication of thought leadership on governance and sustainability on our website. Our voting record information is available on Vote View, an interactive platform that provides relevant company details, proposal types, resolution descriptions, and records of our votes cast.

Appendix A: Assessment Criteria for Common Disclosure Topics

As outlined above, the pillars of our Asset Stewardship Program rest on effective board oversight, quality disclosure and shareholder protection. We are frequently asked to evaluate proposals on various topics, including requests for enhanced disclosure.

Where a company receives a proposal on a topic that the company has determined is material to its business, we will assess the proposal in accordance with the below criteria that we believe represent quality disclosure on commonly requested disclosure topics. In each case, in assessing the proposal against the applicable criteria, we may review the company's relevant disclosures against industry and market practice (e.g., peer disclosure, relevant frameworks, relevant industry guidance).

Climate Disclosure Criteria

For companies that have identified climate-related risks or opportunities as material to their business, we expect the company to provide disclosure on climate-related risks and opportunities relevant to their businesses in line with applicable local regulatory requirements and any voluntary standards and frameworks adopted by the company, as described in the section related to Climate-Related Disclosures above.

Additionally, where a company is among the highest emitters, we consider whether the company discloses:

•Scenario-planning on relevant risk assessment and strategic planning processes;

•The company's plans to achieve stated climate-related targets, if any, including information on timelines and expected emissions reductions; and

•Incorporation of relevant climate considerations in financial planning and/or capital allocation decisions.

Climate Transition Plan Disclosure Criteria for Companies that have Adopted a Climate Transition Plan

We do not expect or require companies to adopt net zero ambitions or join relevant industry initiatives. For companies that have adopted a net zero ambition and/or climate transition plan and that receive a related proposal, we assess the proposal against the disclosure criteria set out below. Given that climate related risks present differently across industries, our assessment of the below criteria may vary to account for best practices in specific industries.

General Climate-related Disclosures

•Description of approach to identifying and assessing climate-related risks and opportunities

•Disclosure of resilience of the company's strategy taking into consideration a range of climate-related scenarios

•Disclosure of Scope 1, Scope 2, and relevant categories of Scope 3 emissions and any assurance

Ambition

•Disclosure of long-term climate ambitions

Targets

•Disclosure of short- and/or medium-term interim climate targets

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•Disclosure of alignment of climate targets with relevant jurisdictional commitments, specific temperature pathways, and/or sectoral decarbonization approaches

Decarbonization Strategy

•Disclosure of plans and actions to support stated climate targets and ambitions

•Disclosure of emissions management efforts within the company's operations and, as applicable, across the value chain

•Disclosure of carbon offsets utilization, if any

•Disclosure of the role of climate solutions (e.g., carbon capture and storage)

•Disclosure of potential social risks and opportunities related to climate transition plan, if any

Capital Allocation

•Disclosure integration of relevant climate considerations in financial planning

•Disclosure of total actual and planned capital deployed toward climate transition plan

•Disclosure of approach to assessing and prioritizing investments toward climate transition plan (e.g. marginal abatement cost curves, internal carbon pricing, if any)

Climate Policy Engagement

•Disclosure of position on climate-related topics relevant to the company's decarbonization strategy

•Disclosure of assessment of stated positions on relevant climate-related topics versus those of associations and other relevant policy-influencing entities, such as trade associations, industry bodies, or coalitions, to which the company belongs, and any efforts taken as a result of this review to address potential misalignment.

Climate Governance

•Disclosure of the board's role in overseeing climate transition plan

•Disclosure of management's role in overseeing climate transition plan

Physical Risk

•Disclosure of assessment of climate-related physical risks

•Disclosure of approach to managing identified climate-related physical risks

Stakeholder Engagement

•Disclosure of engagement with relevant internal stakeholders related to climate transition plan (e.g., workforce training, cross-functional collaboration)

•Disclosure of engagement with relevant external stakeholders related to climate transition plan (e.g., industry collaboration, customer engagement)

Methane Disclosure Criteria

Where a company has determined that methane emissions-related risks or opportunities are material to its business and has received a related shareholder proposal, we will assess the proposal in accordance with the following disclosure criteria:

•Disclosure of methane emissions detection and monitoring efforts

•An explanation of efforts to enhance measurement, reporting, and verification

•A description of the company's strategy to manage methane emissions

•Disclosure of any methane-related metrics and targets utilized

C-13

Nature-Related Disclosures: Biodiversity, Deforestation and other Land-Use, Water Management, Pollution and Waste

Where a company has determined that one or more nature-related risks and opportunities are material to its business and has received a related shareholder proposal, we will assess the proposal in accordance with the following disclosure criteria:

•Governance: Board oversight of the material nature-related risks and opportunities

•Risk Management: Approach to identifying, assessing, monitoring, and mitigating the material nature-related risks and opportunities

•Strategy: Consideration of material nature-related risks and opportunities in business strategy, resiliency, and planning

•Metrics and Targets (when relevant): Metrics used to assess, monitor, and manage nature-related risks and opportunities

Human Capital Management Disclosure Criteria

Where a company has determined that human capital management-related risks or opportunities are material to its business and has received a related shareholder proposal, we will assess the proposal in accordance with the following disclosure criteria:

•Board Oversight: Methods outlining how the board oversees human capital- related risks and opportunities;

•Strategy: Approaches to human capital management and how these advance the long-term business strategy;

•Compensation: Strategies throughout the organization that aim to attract and retain employees, and incentivize contribution to an effective human capital strategy;

•Voice: Channels to ensure the concerns and ideas from workers are solicited and acted upon, and how the workforce is engaged and empowered in the organization; and

•Workforce Demographics: Role of the board in overseeing workforce demographics efforts

Diversity Equity and Inclusion Disclosure Criteria

Where a company has determined that diversity, equity and inclusion-related risks or opportunities are material to its business and has received a related shareholder proposal, we will assess the proposal in accordance with the following disclosure criteria:

•Board Oversight: Describe how the board executes its oversight role in risks and opportunities related to diversity, equity and inclusion

•Strategy: Articulate the role that diversity, equity, and inclusion plays in the company's broader human capital management practices and long-term strategy, as well as how the company intends to implement that strategy

•Metrics: Provide disclosure on the company's global employee base and board demographics, where permitted

•Board Composition: Articulate the role of diversity of skills, backgrounds, experiences, and perspectives in the board's nominating process

Pay Equity Disclosure Criteria (United States and United Kingdom Only)

Where a company has determined that pay equity-related risks or opportunities are material to its business and has received a related shareholder proposal, we will assess the proposal in accordance with the following disclosure criteria:

•Disclosure of adjusted pay gaps related to race and gender within the company (disclosure of the unadjusted pay gap is also encouraged, but not expected outside of the United Kingdom market at this time);

•Disclosure of strategy to achieve and maintain pay equity; and

•Disclosure of the role of the board in overseeing pay strategies as well as diversity-related efforts

C-14

Civil Rights Disclosure Criteria (United States Only)

Where a company has determined that civil rights-related risks or opportunities are material to its business and has received a related shareholder proposal, we will assess the proposal in accordance with the following disclosure criteria:

•Disclosure of risk related to civil rights, including risks associated with products, practices, and services;

•Disclosure of plans to manage and mitigate these risks; and

•Disclosure of processes at the board for overseeing such risks (e.g., committee responsible, frequency of discussions, etc.).

Human Rights Disclosure Criteria

Where a company has determined that human rights-related risks or opportunities are material to its business and has received a related shareholder proposal, we will assess the proposal in accordance with the following disclosure criteria:

•Human rights-related risks the company considers more relevant;

•Plans to manage and mitigate these risks;

•Board oversight of these risks; and

•Assessment of the effectiveness of the human rights risk management program.

Political Contributions Disclosure Criteria (United States Only)

For all companies that receive a shareholder proposal related to political contributions, we will assess the proposal in accordance with the following disclosure criteria:

•Disclosure of all contributions, no matter the dollar value, made by the company, its subsidiaries, and/ or affiliated Political Action Committees (PACs) to individual candidates, PACs, and other political organizations at the state and federal levels in the US; and

•Disclosure of the role of the board in oversight of political contributions.

Lobbying Disclosure Criteria (United States Only)

For all companies that receive a shareholder proposal related to lobbying disclosure, we will assess the proposal in accordance with the following disclosure criteria:

•Disclosure of membership in United States trade associations (to which payments are above $50,000 per year) and

•Disclosure of the role of the board in overseeing lobbying activities.

Trade Association Alignment Disclosure Criteria

For all companies that receive a shareholder proposal related to trade association alignment, we will assess the proposal in accordance with the following disclosure criteria:

•Disclosure of the board's role in overseeing the company's participation in the political process, including membership in trade associations or other policy- influencing entities; and

•Whether the company regularly performs a gap analysis of its stated positions on relevant issues versus those of the trade associations or other policy-influencing organizations of which it is a member, and

•Whether the company disclosed a list of its trade association memberships

Note: We believe that management is best suited to take positions on the matters related to their company and therefore we do not recommend any specific position. Our support of these types of shareholder proposals, if any, solely reflect our support for enhanced disclosure on assessing alignment between stated company positions and the positions of associations and other relevant policy-influencing entities to which the company belongs in line with market expectations and effective risk management.

C-15

About State Street Global Advisors

For over four decades, State Street Global Advisors has served the world's governments, institutions, and financial advisors. With a rigorous, risk-aware approach built on research, analysis, and market-tested experience, and as pioneers in index and ETF investing, we are always inventing new ways to invest. As a result, we have become the world's fourth-largest asset manager* with US $4.72 trillion† under our care.

Pensions & Investments Research Center, as of December 31, 2023.

†

This figure is presented as of December 31, 2024 and includes ETF AUM of $1,577.74 billion USD of which approximately $82.19 billion USD in gold assets with respect to SPDR products for which State Street Global Advisors Funds Distributors, LLC (SSGA FD) acts solely as the marketing agent. SSGA FD and State Street Global Advisors are affiliated. Please note all AUM is unaudited.

ssga.com

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TABLE OF CONTENTS



Coverage			9

1. Board of Directors			10

Voting on Director Nominees in Uncontested Elections			10

Independence			10

ISS Classification of Directors – U.S.			11

Composition			13

Attendance			13

Overboarded Directors			13

Gender Diversity			14

Racial and/or Ethnic Diversity			14

Responsiveness			14

Accountability			15

Poison Pills			15

Unequal Voting Rights			15

Classified Board Structure			16

Removal of Shareholder Discretion on Classified Boards			16

Problematic Governance Structure			16

Unilateral Bylaw/Charter Amendments			16

Restricting Binding Shareholder Proposals			17

Director Performance Evaluation			17

Management Proposals to Ratify Existing Charter or Bylaw Provisions			17

Problematic Audit-Related Practices			17

Problematic Compensation Practices			18

Problematic Pledging of Company Stock			18

Climate Accountability			18

Governance Failures			19

Voting on Director Nominees in Contested Elections			19

Vote-No Campaigns			19

Proxy Contests/Proxy Access			19

Other Board-Related Proposals			20

Adopt Anti-Hedging/Pledging/Speculative Investments Policy			20

Board Refreshment			20

Term/Tenure Limits			20

Age Limits			20

Board Size			20

Classification/Declassification of the Board			20


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CEO Succession Planning			21

Cumulative Voting			21

Director and Officer Indemnification, Liability Protection, and Exculpation			21

Establish/Amend Nominee Qualifications			22

Establish Other Board Committee Proposals			22

Filling Vacancies/Removal of Directors			22

Independent Board Chair			22

Majority of Independent Directors/Establishment of Independent Committees			23

Majority Vote Standard for the Election of Directors			23

Proxy Access			23

Require More Nominees than Open Seats			24

Shareholder Engagement Policy (Shareholder Advisory Committee)			24

2. Audit-Related			25

Auditor Indemnification and Limitation of Liability			25

Auditor Ratification			25

Shareholder Proposals Limiting Non-Audit Services			25

Shareholder Proposals on Audit Firm Rotation			25

3. Shareholder Rights & Defenses			27

Advance Notice Requirements for Shareholder Proposals/Nominations			27

Amend Bylaws without Shareholder Consent			27

Control Share Acquisition Provisions			27

Control Share Cash-Out Provisions			27

Disgorgement Provisions			28

Fair Price Provisions			28

Freeze-Out Provisions			28

Greenmail			28

Shareholder Litigation Rights			28

Federal Forum Selection Provisions			28

Exclusive Forum Provisions for State Law Matters			29

Fee shifting			29

Net Operating Loss (NOL) Protective Amendments			29

Poison Pills (Shareholder Rights Plans)			30

Shareholder Proposals to Put Pill to a Vote and/or Adopt a Pill Policy			30

Management Proposals to Ratify a Poison Pill			30

Management Proposals to Ratify a Pill to Preserve Net Operating Losses (NOLs)			30

Proxy Voting Disclosure, Confidentiality, and Tabulation			31

Ratification Proposals: Management Proposals to Ratify Existing Charter or Bylaw Provisions			31

Reimbursing Proxy Solicitation Expenses			32


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Reincorporation Proposals			32

Shareholder Ability to Act by Written Consent			32

Shareholder Ability to Call Special Meetings			33

Stakeholder Provisions			33

State Antitakeover Statutes			33

Supermajority Vote Requirements			33

Virtual Shareholder Meetings			33

4. Capital/Restructuring			34

Capital			34

Adjustments to Par Value of Common Stock			34

Common Stock Authorization			34

General Authorization Requests			34

Specific Authorization Requests			35

Dual Class Structure			35

Issue Stock for Use with Rights Plan			35

Preemptive Rights			35

Preferred Stock Authorization			35

General Authorization Requests			35

Recapitalization Plans			37

Reverse Stock Splits			37

Share Issuance Mandates at U.S. Domestic Issuers Incorporated Outside the U.S.			37

Share Repurchase Programs			37

Share Repurchase Programs Shareholder Proposals			38

Stock Distributions: Splits and Dividends			38

Tracking Stock			38

Restructuring			38

Appraisal Rights			38

Asset Purchases			38

Asset Sales			39

Bundled Proposals			39

Conversion of Securities			39

Corporate Reorganization/Debt Restructuring/Prepackaged Bankruptcy Plans/Reverse Leveraged Buyouts/Wrap Plans			39

Formation of Holding Company			40

Going Private and Going Dark Transactions (LBOs and Minority Squeeze-outs)			40

Joint Ventures			40

Liquidations			41

Mergers and Acquisitions			41

Private Placements/Warrants/Convertible Debentures			42


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Reorganization/Restructuring Plan (Bankruptcy)			43

Special Purpose Acquisition Corporations (SPACs)			43

Special Purpose Acquisition Corporations (SPACs) - Proposals for Extensions			43

Spin-offs			44

Value Maximization Shareholder Proposals			44

5. Compensation			45

Executive Pay Evaluation			45

Advisory Votes on Executive Compensation—Management Proposals (Say-on-Pay)			45

Pay-for-Performance Evaluation			46

Problematic Pay Practices			47

Compensation Committee Communications and Responsiveness			48

Frequency of Advisory Vote on Executive Compensation (“Say When on Pay”)			48

Voting on Golden Parachutes in an Acquisition, Merger, Consolidation, or Proposed Sale			48

Equity-Based and Other Incentive Plans			49

Shareholder Value Transfer (SVT)			50

Three-Year Value-Adjusted Burn Rate			50

Egregious Factors			50

Liberal Change in Control Definition			50

Repricing Provisions			51

Problematic Pay Practices or Significant Pay-for-Performance Disconnect			51

Amending Cash and Equity Plans (including Approval for Tax Deductibility (162(m))			51

Specific Treatment of Certain Award Types in Equity Plan Evaluations			52

Dividend Equivalent Rights			52

Operating Partnership (OP) Units in Equity Plan Analysis of Real Estate Investment Trusts (REITs)			52

Other Compensation Plans			52

401(k) Employee Benefit Plans			52

Employee Stock Ownership Plans (ESOPs)			52

Employee Stock Purchase Plans—Qualified Plans			53

Employee Stock Purchase Plans—Non-Qualified Plans			53

Option Exchange Programs/Repricing Options			53

Stock Plans in Lieu of Cash			54

Transfer Stock Option (TSO) Programs			54

Director Compensation			55

Shareholder Ratification of Director Pay Programs			55

Equity Plans for Non-Employee Directors			55

Non-Employee Director Retirement Plans			55

Shareholder Proposals on Compensation			56

Bonus Banking/Bonus Banking “Plus”			56

Compensation Consultants—Disclosure of Board or Company’s Utilization			56


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Disclosure/Setting Levels or Types of Compensation for Executives and Directors			56

Golden Coffins/Executive Death Benefits			56

Hold Equity Past Retirement or for a Significant Period of Time			56

Pay Disparity			57

Pay for Performance/Performance-Based Awards			57

Pay for Superior Performance			57

Pre-Arranged Trading Plans (10b5-1 Plans)			58

Prohibit Outside CEOs from Serving on Compensation Committees			58

Recoupment of Incentive or Stock Compensation in Specified Circumstances			58

Severance and Golden Parachute Agreements			59

Share Buyback Impact on Incentive Program Metrics			59

Supplemental Executive Retirement Plans (SERPs)			59

Tax Gross-Up Proposals			59

Termination of Employment Prior to Severance Payment/Eliminating Accelerated Vesting of Unvested Equity			60

6. Routine/Miscellaneous			61

Adjourn Meeting			61

Amend Quorum Requirements			61

Amend Minor Bylaws			61

Change Company Name			61

Change Date, Time, or Location of Annual Meeting			62

Other Business			62

7. Social and Environmental Issues			63

Global Approach – E&S Shareholder Proposals			63

Endorsement of Principles			63

Animal Welfare			63

Animal Welfare Policies			63

Animal Testing			64

Animal Slaughter			64

Consumer Issues			64

Genetically Modified Ingredients			64

Reports on Potentially Controversial Business/Financial Practices			65

Pharmaceutical Pricing, Access to Medicines, and Prescription Drug Reimportation			65

Product Safety and Toxic/Hazardous Materials			65

Tobacco-Related Proposals			66

Climate Change			66

Say on Climate (SoC) Management Proposals			66

Say on Climate (SoC) Shareholder Proposals			67

Climate Change/Greenhouse Gas (GHG) Emissions			67


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Energy Efficiency			68

Renewable Energy			68

Diversity			68

Board Diversity			68

Equality of Opportunity			69

Gender Identity, Sexual Orientation, and Domestic Partner Benefits			69

Gender, Race/Ethnicity Pay Gap			69

Racial Equity and/or Civil Rights Audit Guidelines			70

Environment and Sustainability			70

Facility and Workplace Safety			70

Natural Capital- Related and/or Community Impact Assessment Proposals			70

Hydraulic Fracturing			71

Operations in Protected Areas			71

Recycling			71

Sustainability Reporting			71

Water Issues			71

General Corporate Issues			72

Charitable Contributions			72

Data Security, Privacy, and Internet Issues			72

ESG Compensation-Related Proposals			72

Human Rights, Human Capital Management, and International Operations			73

Human Rights Proposals			73

Mandatory Arbitration			73

Operations in High-Risk Markets			73

Outsourcing/Offshoring			74

Sexual Harassment			74

Weapons and Military Sales			74

Political Activities			75

Lobbying			75

Political Contributions			75

Political Expenditures and Lobbying Congruency			75

Political Ties			76

8. Mutual Fund Proxies			77

Election of Directors			77

Closed End Funds- Unilateral Opt-In to Control Share Acquisition Statutes			77

Converting Closed-end Fund to Open-end Fund			77

Proxy Contests			77

Investment Advisory Agreements			77

Approving New Classes or Series of Shares			78


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Preferred Stock Proposals			78

1940 Act Policies			78

Changing a Fundamental Restriction to a Nonfundamental Restriction			78

Change Fundamental Investment Objective to Nonfundamental			78

Name Change Proposals			78

Change in Fund’s Subclassification			79

Business Development Companies—Authorization to Sell Shares of Common Stock at a Price below Net Asset Value			79

Disposition of Assets/Termination/Liquidation			79

Changes to the Charter Document			79

Changing the Domicile of a Fund			80

Authorizing the Board to Hire and Terminate Subadvisers Without Shareholder Approval			80

Distribution Agreements			80

Master-Feeder Structure			80

Mergers			80

Shareholder Proposals for Mutual Funds			80

Establish Director Ownership Requirement			80

Reimburse Shareholder for Expenses Incurred			81

Terminate the Investment Advisor			81


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Coverage

The U.S. research team provides proxy analyses and voting recommendations for the common shareholder meetings of U.S. - incorporated companies that are publicly-traded on U.S. exchanges, as well as certain OTC companies, if they are held in our institutional investor clients’ portfolios. Coverage generally includes corporate actions for common equity holders, such as written consents and bankruptcies. ISS’ U.S. coverage includes investment companies (including open-end funds, closed-end funds, exchange-traded funds, and unit investment trusts), limited partnerships (“LPs”), master limited partnerships (“MLPs”), limited liability companies (“LLCs”), and business development companies. ISS reviews its universe of coverage on an annual basis, and the coverage is subject to change based on client need and industry trends.

Foreign-incorporated companies

In addition to U.S.- incorporated, U.S.- listed companies, ISS’ U.S. policies are applied to certain foreign-incorporated company analyses. Like the SEC, ISS distinguishes two types of companies that list but are not incorporated in the U.S.:

◾

U.S. Domestic Issuers – which have a majority of outstanding shares held in the U.S. and meet other criteria, as determined by the SEC, and are subject to the same disclosure and listing standards as U.S. incorporated companies (e.g. they are required to file DEF14A proxy statements) – are generally covered under standard U.S. policy guidelines.

◾

Foreign Private Issuers (FPIs) – which are allowed to take exemptions from most disclosure requirements (e.g., they are allowed to file 6-K for their proxy materials) and U.S. listing standards – are generally covered under a combination of policy guidelines:

◾

FPI Guidelines (see the Americas Regional Proxy Voting Guidelines), may apply to companies incorporated in governance havens, and apply certain minimum independence and disclosure standards in the evaluation of key proxy ballot items, such as the election of directors; and/or

◾

Guidelines for the market that is responsible for, or most relevant to, the item on the ballot.

U.S. incorporated companies listed only on non-U.S. exchanges are generally covered under the ISS guidelines for the market on which they are traded.

An FPI is generally covered under ISS’ approach to FPIs outlined above, even if such FPI voluntarily files a proxy statement and/or other filing normally required of a U.S. Domestic Issuer, so long as the company retains its FPI status.

In all cases – including with respect to other companies with cross-market features that may lead to ballot items related to multiple markets – items that are on the ballot solely due to the requirements of another market (listing, incorporation, or national code) may be evaluated under the policy of the relevant market, regardless of the “assigned” primary market coverage.


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1. Board of Directors

Voting on Director Nominees in Uncontested Elections

Four fundamental principles apply when determining votes on director nominees:

Independence: Boards should be sufficiently independent from management (and significant shareholders) to ensure that they are able and motivated to effectively supervise management’s performance for the benefit of all shareholders, including in setting and monitoring the execution of corporate strategy, with appropriate use of shareholder capital, and in setting and monitoring executive compensation programs that support that strategy. The chair of the board should ideally be an independent director, and all boards should have an independent leadership position or a similar role in order to help provide appropriate counterbalance to executive management, as well as having sufficiently independent committees that focus on key governance concerns such as audit, compensation, and nomination of directors.

Composition: Companies should ensure that directors add value to the board through their specific skills and expertise and by having sufficient time and commitment to serve effectively. Boards should be of a size appropriate to accommodate diversity, expertise, and independence, while ensuring active and collaborative participation by all members. Boards should be sufficiently diverse to ensure consideration of a wide range of perspectives.

Responsiveness: Directors should respond to investor input, such as that expressed through significant opposition to management proposals, significant support for shareholder proposals (whether binding or non-binding), and tender offers where a majority of shares are tendered.

Accountability: Boards should be sufficiently accountable to shareholders, including through transparency of the company’s governance practices and regular board elections, by the provision of sufficient information for shareholders to be able to assess directors and board composition, and through the ability of shareholders to remove directors.

General Recommendation: Generally vote for director nominees, except under the following circumstances (with new nominees¹ considered on case-by-case basis):

Independence

Vote against² or withhold from non-independent directors (Executive Directors and Non-Independent Non-Executive Directors per ISS’ Classification of Directors) when:

◾

Independent directors comprise 50 percent or less of the board;

◾

The non-independent director serves on the audit, compensation, or nominating committee;

◾

The company lacks an audit, compensation, or nominating committee so that the full board functions as that committee; or

¹A “new nominee” is a director who is being presented for election by shareholders for the first time. Recommendations on new nominees who have served for less than one year are made on a case-by-case basis depending on the timing of their appointment and the problematic governance issue in question.

²In general, companies with a plurality vote standard use “Withhold” as the contrary vote option in director elections; companies with a majority vote standard use “Against”. However, it will vary by company and the proxy must be checked to determine the valid contrary vote option for the particular company.

The company lacks a formal nominating committee, even if the board attests that the independent directors fulfill the functions of such a committee.


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ISS Classification of Directors – U.S.

Executive Director

1.1.

Current officer¹ of the company or one of its affiliates².

Non-Independent Non-Executive Director

Board Identification

2.1.

Director identified as not independent by the board.

Controlling/Significant Shareholder

2.2.

Beneficial owner of more than 50 percent of the company’s voting power (this may be aggregated if voting power is distributed among more than one member of a group).

Current Employment at Company or Related Company

2.3.

Non-officer employee of the firm (including employee representatives).

2.4.

Officer¹, former officer, or general or limited partner of a joint venture or partnership with the company.

Former Employment

2.5.

Former CEO of the company.^{3, 4}

2.6.

Former non-CEO officer¹ of the company or an affiliate² within the past five years.

2.7.

Former officer¹ of an acquired company within the past five years.⁴

2.8.

Officer¹ of a former parent or predecessor firm at the time the company was sold or split off within the past five years.

2.9.

Former interim officer if the service was longer than 18 months. If the service was between 12 and 18 months an assessment of the interim officer’s employment agreement will be made.⁵

Family Members

2.10.

Immediate family member⁶ of a current or former officer¹ of the company or its affiliates² within the last five years.

2.11.

Immediate family member⁶ of a current employee of company or its affiliates² where additional factors raise concern (which may include, but are not limited to, the following: a director related to numerous employees; the company or its affiliates employ relatives of numerous board members; or a non-Section 16 officer in a key strategic role).

Professional, Transactional, and Charitable Relationships

2.12.

Director who (or whose immediate family member⁶) currently provides professional services⁷ in excess of $10,000 per year to: the company, an affiliate², or an individual officer of the company or an affiliate; or who is (or whose immediate family member⁶ is) a partner, employee, or controlling shareholder of an organization which provides the services.

2.13.

Director who (or whose immediate family member⁶) currently has any material transactional relationship⁸ with the company or its affiliates²; or who is (or whose immediate family member⁶ is) a partner in, or a controlling shareholder or an executive officer of, an organization which has the material transactional relationship⁸ (excluding investments in the company through a private placement).

2.14.

Director who (or whose immediate family member⁶) is a trustee, director, or employee of a charitable or non-profit organization that receives material grants or endowments⁸ from the company or its affiliates².

Other Relationships

2.15.

Party to a voting agreement⁹ to vote in line with management on proposals being brought to shareholder vote.

2.16.

Has (or an immediate family member⁶ has) an interlocking relationship as defined by the SEC involving members of the board of directors or its Compensation Committee.¹⁰

2.17.

Founder¹¹ of the company but not currently an employee.

2.18.

Director with pay comparable to Named Executive Officers.

2.19.

Any material¹² relationship with the company.


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Independent Director

3.1.

No material¹² connection to the company other than a board seat.

Footnotes:

1. The definition of officer will generally follow that of a “Section 16 officer” (officers subject to Section 16 of the Securities and Exchange Act of 1934) and includes the chief executive, operating, financial, legal, technology, and accounting officers of a company (including the president, treasurer, secretary, controller, or any vice president in charge of a principal business unit, division, or policy function). Current interim officers are included in this category. For private companies, the equivalent positions are applicable. A non-employee director serving as an officer due to statutory requirements (e.g. corporate secretary) will generally be classified as a Non-Independent Non-Executive Director under “Any material relationship with the company.” However, if the company provides explicit disclosure that the director is not receiving additional compensation exceeding $10,000 per year for serving in that capacity, then the director will be classified as an Independent Director.

2. “Affiliate” includes a subsidiary, sibling company, or parent company. ISS uses 50 percent control ownership by the parent company as the standard for applying its affiliate designation. The manager/advisor of an externally managed issuer (EMI) is considered an affiliate.

3. Includes any former CEO of the company prior to the company’s initial public offering (IPO).

4. When there is a former CEO of a special purpose acquisition company (SPAC) serving on the board of an acquired company, ISS will generally classify such directors as independent unless determined otherwise taking into account the following factors: the applicable listing standards determination of such director’s independence; any operating ties to the firm; and the existence of any other conflicting relationships or related party transactions.

5. ISS will look at the terms of the interim officer’s employment contract to determine if it contains severance pay, long-term health and pension benefits, or other such standard provisions typically contained in contracts of permanent, non-temporary CEOs. ISS will also consider if a formal search process was under way for a full-time officer at the time.

6. “Immediate family member” follows the SEC’s definition of such and covers spouses, parents, children, step-parents, step-children, siblings, in-laws, and any person (other than a tenant or employee) sharing the household of any director, nominee for director, executive officer, or significant shareholder of the company.

7. Professional services can be characterized as advisory in nature, generally involve access to sensitive company information or to strategic decision-making, and typically have a commission- or fee-based payment structure. Professional services generally include but are not limited to the following: investment banking/financial advisory services, commercial banking (beyond deposit services), investment services, insurance services, accounting/audit services, consulting services, marketing services, legal services, property management services, realtor services, lobbying services, executive search services, and IT consulting services. The following would generally be considered transactional relationships and not professional services: deposit services, IT tech support services, educational services, and construction services. The case of participation in a banking syndicate by a non-lead bank should be considered a transactional (and hence subject to the associated materiality test) rather than a professional relationship. “Of Counsel” relationships are only considered immaterial if the individual does not receive any form of compensation (in excess of $10,000 per year) from, or is a retired partner of, the firm providing the professional service. The case of a company providing a professional service to one of its directors or to an entity with which one of its directors is affiliated, will be considered a transactional rather than a professional relationship. Insurance services and marketing services are assumed to be professional services unless the company explains why such services are not advisory.

8. A material transactional relationship, including grants to non-profit organizations, exists if the company makes annual payments to, or receives annual payments from, another entity, exceeding the greater of: $200,000 or 5 percent of the recipient’s gross revenues, for a company that follows NASDAQ listing standards; or the greater of $1,000,000 or 2 percent of the recipient’s gross revenues, for a company that follows NYSE listing standards. For a company that follows neither of the preceding standards, ISS will apply the NASDAQ-based materiality test. (The recipient is the party receiving the financial proceeds from the transaction).

9. Dissident directors who are parties to a voting agreement pursuant to a settlement or similar arrangement may be classified as Independent Directors if an analysis of the following factors indicates that the voting agreement does not compromise their alignment with all shareholders’ interests: the terms of the agreement; the duration of the standstill provision in the agreement; the limitations and requirements of actions that are agreed upon; if the dissident director nominee(s) is subject to the standstill; and if there any conflicting relationships or related party transactions.


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10. Interlocks include: executive officers serving as directors on each other’s compensation or similar committees (or, in the absence of such a committee, on the board); or executive officers sitting on each other’s boards and at least one serves on the other’s compensation or similar committees (or, in the absence of such a committee, on the board).

11. The operating involvement of the founder with the company will be considered; if the founder was never employed by the company, ISS may deem him or her an Independent Director.

12. For purposes of ISS’s director independence classification, “material” will be defined as a standard of relationship (financial, personal, or otherwise) that a reasonable person might conclude could potentially influence one’s objectivity in the boardroom in a manner that would have a meaningful impact on an individual’s ability to satisfy requisite fiduciary standards on behalf of shareholders.

Composition

Attendance at Board and Committee Meetings: Generally vote against or withhold from directors (except nominees who served only part of the fiscal year³) who attend less than 75 percent of the aggregate of their board and committee meetings for the period for which they served, unless an acceptable reason for absences is disclosed in the proxy or another SEC filing. Acceptable reasons for director absences are generally limited to the following:

◾

Medical issues/illness;

◾

Family emergencies; and

◾

Missing only one meeting (when the total of all meetings is three or fewer).

In cases of chronic poor attendance without reasonable justification, in addition to voting against the director(s) with poor attendance, generally vote against or withhold from appropriate members of the nominating/governance committees or the full board.

If the proxy disclosure is unclear and insufficient to determine whether a director attended at least 75 percent of the aggregate of his/her board and committee meetings during his/her period of service, vote against or withhold from the director(s) in question.

Overboarded Directors: Generally vote against or withhold from individual directors who:

◾

Sit on more than five public company boards; or

◾

Are CEOs of public companies who sit on the boards of more than two public companies besides their own— withhold only at their outside boards⁴.

NOTE: For shareholder meeting reports published on or after February 25th, 2025, Institutional Shareholder Services (ISS) has indefinitely halted the consideration of the gender diversity of a company’s board when making vote recommendations with respect to the election or re-election of directors at U.S. companies covered by these guidelines under its proprietary ISS U.S. Benchmark policy.

³ Nominees who served for only part of the fiscal year are generally exempted from the attendance policy.

⁴ Although all of a CEO’s subsidiary boards with publicly-traded common stock will be counted as separate boards, ISS will not recommend a withhold vote for the CEO of a parent company board or any of the controlled (>50 percent ownership) subsidiaries of that parent but may do so at subsidiaries that are less than 50 percent controlled and boards outside the parent/subsidiary relationships.


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Gender Diversity: Generally vote against or withhold from the chair of the nominating committee (or other directors on a case-by-case basis) at companies where there are no women on the company’s board. An exception will be made if there was at least one woman on the board at the preceding annual meeting and the board makes a firm commitment to return to a gender-diverse status within a year.

NOTE: For shareholder meeting reports published on or after February 25th, 2025, Institutional Shareholder Services (ISS) has indefinitely halted the consideration of the racial and/or ethnic diversity of a company’s board when making vote recommendations with respect to the election or re-election of directors at U.S. companies covered under these guidelines under its proprietary ISS U.S. Benchmark policy.

Racial and/or Ethnic Diversity: For companies in the Russell 3000 or S&P 1500 indices, generally vote against or withhold from the chair of the nominating committee (or other directors on a case-by-case basis) where the board has no apparent racially or ethnically diverse members⁵. An exception will be made if there was racial and/or ethnic diversity on the board at the preceding annual meeting and the board makes a firm commitment to appoint at least one racial and/or ethnic diverse member within a year.

Responsiveness

Vote case-by-case on individual directors, committee members, or the entire board of directors as appropriate if:

◾

The board failed to act on a shareholder proposal that received the support of a majority of the shares cast in the previous year or failed to act on a management proposal seeking to ratify an existing charter/bylaw provision that received opposition of a majority of the shares cast in the previous year. Factors that will be considered are:

◾

Disclosed outreach efforts by the board to shareholders in the wake of the vote;

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Rationale provided in the proxy statement for the level of implementation;

◾

The subject matter of the proposal;

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The level of support for and opposition to the resolution in past meetings;

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Actions taken by the board in response to the majority vote and its engagement with shareholders;

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The continuation of the underlying issue as a voting item on the ballot (as either shareholder or management proposals); and

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Other factors as appropriate.

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The board failed to act on takeover offers where the majority of shares are tendered; or

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At the previous board election, any director received more than 50 percent withhold/against votes of the shares cast and the company has failed to address the issue(s) that caused the high withhold/against vote.

Vote case-by-case on Compensation Committee members (or, in exceptional cases, the full board) and the Say on Pay proposal if:

◾

The company’s previous say-on-pay received the support of less than 70 percent of votes cast. Factors that will be considered are:

◾

The company’s response, including:

◾

Disclosure of engagement efforts with major institutional investors, including the frequency and timing of engagements and the company participants (including whether independent directors participated);

◾

Disclosure of the specific concerns voiced by dissenting shareholders that led to the say-on-pay opposition; and

◾

Disclosure of specific and meaningful actions taken to address shareholders’ concerns;

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Other recent compensation actions taken by the company;

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Whether the issues raised are recurring or isolated;

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The company’s ownership structure; and

⁵ Aggregate diversity statistics provided by the board will only be considered if specific to racial and/or ethnic diversity.


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Whether the support level was less than 50 percent, which would warrant the highest degree of responsiveness.

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The board implements an advisory vote on executive compensation on a less frequent basis than the frequency that received the plurality of votes cast.

Accountability

PROBLEMATIC TAKEOVER DEFENSES, CAPITAL STRUCTURE, AND GOVERNANCE STRUCTURE

Poison Pills: Generally vote against or withhold from all nominees (except new nominees ¹, who should be considered case-by-case) if:

◾

The company has a poison pill with a deadhand or slowhand feature⁶;

◾

The board makes a material adverse modification to an existing pill, including, but not limited to, extension, renewal, or lowering the trigger, without shareholder approval; or

◾

The company has a long-term poison pill (with a term of over one year) that was not approved by the public shareholders⁷.

Vote case-by-case on nominees if the board adopts an initial short-term pill⁶ (with a term of one year or less) without shareholder approval, taking into consideration:

◾

The trigger threshold and other terms of the pill;

◾

The disclosed rationale for the adoption;

◾

The context in which the pill was adopted, (e.g., factors such as the company’s size and stage of development, sudden changes in its market capitalization, and extraordinary industry-wide or macroeconomic events);

◾

A commitment to put any renewal to a shareholder vote;

◾

The company’s overall track record on corporate governance and responsiveness to shareholders; and

◾

Other factors as relevant.

Unequal Voting Rights: Generally vote withhold or against directors individually, committee members, or the entire board (except new nominees ¹, who should be considered case-by-case), if the company employs a common stock structure with unequal voting rights⁸.

Exceptions to this policy will generally be limited to:

◾

Newly-public companies⁹ with a sunset provision of no more than seven years from the date of going public;

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Limited Partnerships and the Operating Partnership (OP) unit structure of REITs;

◾

Situations where the super-voting shares represent less than 5% of total voting power and therefore considered to be de minimis; or

◾

The company provides sufficient protections for minority shareholders, such as allowing minority shareholders a regular binding vote on whether the capital structure should be maintained.

⁶ If a short-term pill with a deadhand or slowhand feature is enacted but expires before the next shareholder vote, ISS will generally still recommend withhold/against nominees at the next shareholder meeting following its adoption.

⁷ Approval prior to, or in connection, with a company’s becoming publicly-traded, or in connection with a de-SPAC transaction, is insufficient.

⁸ This generally includes classes of common stock that have additional votes per share than other shares; classes of shares that are not entitled to vote on all the same ballot items or nominees; or stock with time-phased voting rights (“loyalty shares”).

⁹ Includes companies that emerge from bankruptcy, SPAC transactions, spin-offs, direct listings, and those who complete a traditional initial public offering.


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Classified Board Structure: The board is classified, and a continuing director responsible for a problematic governance issue at the board/committee level that would warrant a withhold/against vote recommendation is not up for election. All appropriate nominees (except new) may be held accountable.

Removal of Shareholder Discretion on Classified Boards: The company has opted into, or failed to opt out of, state laws requiring a classified board structure.

Problematic Governance Structure: For companies that hold or held their first annual meeting ⁹ of public shareholders after Feb. 1, 2015, generally vote against or withhold from directors individually, committee members, or the entire board (except new nominees ¹, who should be considered case-by-case) if, prior to or in connection with the company’s public offering, the company or its board adopted the following bylaw or charter provisions that are considered to be materially adverse to shareholder rights:

◾

Supermajority vote requirements to amend the bylaws or charter;

◾

A classified board structure; or

◾

Other egregious provisions.

A provision which specifies that the problematic structure(s) will be sunset within seven years of the date of going public will be considered a mitigating factor.

Unless the adverse provision is reversed or removed, vote case-by-case on director nominees in subsequent years.

Unilateral Bylaw/Charter Amendments: Generally vote against or withhold from directors individually, committee members, or the entire board (except new nominees ¹, who should be considered case-by-case) if the board amends the company’s bylaws or charter without shareholder approval in a manner that materially diminishes shareholders’ rights or that could adversely impact shareholders, considering the following factors:

◾

The board’s rationale for adopting the bylaw/charter amendment without shareholder ratification;

◾

Disclosure by the company of any significant engagement with shareholders regarding the amendment;

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The level of impairment of shareholders’ rights caused by the board’s unilateral amendment to the bylaws/charter;

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The board’s track record with regard to unilateral board action on bylaw/charter amendments or other entrenchment provisions;

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The company’s ownership structure;

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The company’s existing governance provisions;

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The timing of the board’s amendment to the bylaws/charter in connection with a significant business development; and

◾

Other factors, as deemed appropriate, that may be relevant to determine the impact of the amendment on shareholders.

Unless the adverse amendment is reversed or submitted to a binding shareholder vote, in subsequent years vote case-by-case on director nominees. Generally vote against (except new nominees ¹, who should be considered case-by-case) if the directors:

◾

Classified the board;

◾

Adopted supermajority vote requirements to amend the bylaws or charter;

◾

Eliminated shareholders’ ability to amend bylaws;

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Adopted a fee-shifting provision; or

◾

Adopted another provision deemed egregious.


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Restricting Binding Shareholder Proposals: Generally vote against or withhold from the members of the governance committee if:

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The company’s governing documents impose undue restrictions on shareholders’ ability to amend the bylaws. Such restrictions include but are not limited to: outright prohibition on the submission of binding shareholder proposals or share ownership requirements, subject matter restrictions, or time holding requirements in excess of SEC Rule 14a-8. Vote against or withhold on an ongoing basis.

Submission of management proposals to approve or ratify requirements in excess of SEC Rule 14a-8 for the submission of binding bylaw amendments will generally be viewed as an insufficient restoration of shareholders’ rights. Generally continue to vote against or withhold on an ongoing basis until shareholders are provided with an unfettered ability to amend the bylaws or a proposal providing for such unfettered right is submitted for shareholder approval.

Director Performance Evaluation: The board lacks mechanisms to promote accountability and oversight, coupled with sustained poor performance relative to peers. Sustained poor performance is measured by one-, three-, and five-year total shareholder returns in the bottom half of a company’s four-digit GICS industry group (Russell 3000 companies only). Take into consideration the company’s operational metrics and other factors as warranted. Problematic provisions include but are not limited to:

◾

A classified board structure;

◾

A supermajority vote requirement;

◾

Either a plurality vote standard in uncontested director elections, or a majority vote standard in contested elections;

◾

The inability of shareholders to call special meetings;

◾

The inability of shareholders to act by written consent;

◾

A multi-class capital structure; and/or

◾

A non-shareholder-approved poison pill.

Management Proposals to Ratify Existing Charter or Bylaw Provisions: Vote against/withhold from individual directors, members of the governance committee, or the full board, where boards ask shareholders to ratify existing charter or bylaw provisions considering the following factors:

◾

The presence of a shareholder proposal addressing the same issue on the same ballot;

◾

The board’s rationale for seeking ratification;

◾

Disclosure of actions to be taken by the board should the ratification proposal fail;

◾

Disclosure of shareholder engagement regarding the board’s ratification request;

◾

The level of impairment to shareholders’ rights caused by the existing provision;

◾

The history of management and shareholder proposals on the provision at the company’s past meetings;

◾

Whether the current provision was adopted in response to the shareholder proposal;

◾

The company’s ownership structure; and

◾

Previous use of ratification proposals to exclude shareholder proposals.

Problematic Audit-Related Practices

Generally vote against or withhold from the members of the Audit Committee if:

◾

The non-audit fees paid to the auditor are excessive;

◾

The company receives an adverse opinion on the company’s financial statements from its auditor; or

◾

There is persuasive evidence that the Audit Committee entered into an inappropriate indemnification agreement with its auditor that limits the ability of the company, or its shareholders, to pursue legitimate legal recourse against the audit firm.


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Vote case-by-case on members of the Audit Committee and potentially the full board if:

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Poor accounting practices are identified that rise to a level of serious concern, such as: fraud; misapplication of GAAP; and material weaknesses identified in Section 404 disclosures. Examine the severity, breadth, chronological sequence, and duration, as well as the company’s efforts at remediation or corrective actions, in determining whether withhold/against votes are warranted.

Problematic Compensation Practices

In the absence of an Advisory Vote on Executive Compensation (Say on Pay) ballot item or in egregious situations, vote against or withhold from the members of the Compensation Committee and potentially the full board if:

◾

There is an unmitigated misalignment between CEO pay and company performance (pay for performance);

◾

The company maintains significant problematic pay practices; or

◾

The board exhibits a significant level of poor communication and responsiveness to shareholders.

Generally vote against or withhold from the Compensation Committee chair, other committee members, or potentially the full board if:

◾

The company fails to include a Say on Pay ballot item when required under SEC provisions, or under the company’s declared frequency of say on pay; or

◾

The company fails to include a Frequency of Say on Pay ballot item when required under SEC provisions.

Generally vote against members of the board committee responsible for approving/setting non-employee director compensation if there is a pattern (i.e. two or more years) of awarding excessive non-employee director compensation without disclosing a compelling rationale or other mitigating factors.

Problematic Pledging of Company Stock: Vote against the members of the committee that oversees risks related to pledging, or the full board, where a significant level of pledged company stock by executives or directors raises concerns. The following factors will be considered:

◾

The presence of an anti-pledging policy, disclosed in the proxy statement, that prohibits future pledging activity;

◾

The magnitude of aggregate pledged shares in terms of total common shares outstanding, market value, and trading volume;

◾

Disclosure of progress or lack thereof in reducing the magnitude of aggregate pledged shares over time;

◾

Disclosure in the proxy statement that shares subject to stock ownership and holding requirements do not include pledged company stock; and

◾

Any other relevant factors.

Climate Accountability

For companies that are significant greenhouse gas (GHG) emitters, through their operations or value chain¹⁰, generally vote against or withhold from the incumbent chair of the responsible committee (or other directors on a case-by-case basis) in cases where ISS determines that the company is not taking the minimum steps needed to understand, assess, and mitigate risks related to climate change to the company and the larger economy.

Minimum steps to understand and mitigate those risks are considered to be the following. Both minimum criteria will be required to be in alignment with the policy :

¹⁰ Companies defined as “significant GHG emitters” will be those on the current Climate Action 100+ Focus Group list.


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Detailed disclosure of climate-related risks, such as according to the framework established by the Task Force on Climate-related Financial Disclosures (TCFD), including:

◾

Board governance measures;

◾

Corporate strategy;

◾

Risk management analyses; and

◾

Metrics and targets.

◾

Appropriate GHG emissions reduction targets.

At this time, “appropriate GHG emissions reductions targets” will be medium-term GHG reduction targets or Net Zero-by-2050 GHG reduction targets for a company’s operations (Scope 1) and electricity use (Scope 2). Targets should cover the vast majority of the company’s direct emissions.

Governance Failures

Under extraordinary circumstances, vote against or withhold from directors individually, committee members, or the entire board, due to:

◾

Material failures of governance, stewardship, risk oversight¹¹, or fiduciary responsibilities at the company;

◾

Failure to replace management as appropriate; or

◾

Egregious actions related to a director’s service on other boards that raise substantial doubt about his or her ability to effectively oversee management and serve the best interests of shareholders at any company.

Voting on Director Nominees in Contested Elections

Vote-No Campaigns

General Recommendation: In cases where companies are targeted in connection with public “vote-no” campaigns, evaluate director nominees under the existing governance policies for voting on director nominees in uncontested elections. Take into consideration the arguments submitted by shareholders and other publicly available information.

Proxy Contests/Proxy Access

General Recommendation: Vote case-by-case on the election of directors in contested elections, considering the following factors:

◾

Long-term financial performance of the company relative to its industry;

◾

Management’s track record;

◾

Background to the contested election;

◾

Nominee qualifications and any compensatory arrangements;

◾

Strategic plan of dissident slate and quality of the critique against management;

◾

Likelihood that the proposed goals and objectives can be achieved (both slates); and

◾

Stock ownership positions.

In the case of candidates nominated pursuant to proxy access, vote case-by-case considering any applicable factors listed above or additional factors which may be relevant, including those that are specific to the company, to the nominee(s) and/or to the nature of the election (such as whether there are more candidates than board seats).

¹¹ Examples of failure of risk oversight include but are not limited to: bribery; large or serial fines or sanctions from regulatory bodies; demonstrably poor risk oversight of environmental and social issues, including climate change; significant adverse legal judgments or settlement; or hedging of company stock.


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Other Board-Related Proposals

Adopt Anti-Hedging/Pledging/Speculative Investments Policy

General Recommendation: Generally vote for proposals seeking a policy that prohibits named executive officers from engaging in derivative or speculative transactions involving company stock, including hedging, holding stock in a margin account, or pledging stock as collateral for a loan. However, the company’s existing policies regarding responsible use of company stock will be considered.

Board Refreshment

Board refreshment is best implemented through an ongoing program of individual director evaluations, conducted annually, to ensure the evolving needs of the board are met and to bring in fresh perspectives, skills, and diversity as needed.

Term/Tenure Limits

General Recommendation: Vote case-by-case on management proposals regarding director term/tenure limits, considering:

◾

The rationale provided for adoption of the term/tenure limit;

◾

The robustness of the company’s board evaluation process;

◾

Whether the limit is of sufficient length to allow for a broad range of director tenures;

◾

Whether the limit would disadvantage independent directors compared to non-independent directors; and

◾

Whether the board will impose the limit evenly, and not have the ability to waive it in a discriminatory manner.

◾

Vote case-by-case on shareholder proposals asking for the company to adopt director term/tenure limits, considering:

◾

The scope of the shareholder proposal; and

◾

Evidence of problematic issues at the company combined with, or exacerbated by, a lack of board refreshment.

Age Limits

General Recommendation: Generally vote against management and shareholder proposals to limit the tenure of independent directors through mandatory retirement ages. Vote for proposals to remove mandatory age limits.

Board Size

General Recommendation: Vote for proposals seeking to fix the board size or designate a range for the board size.

Vote against proposals that give management the ability to alter the size of the board outside of a specified range without shareholder approval.

Classification/Declassification of the Board

General Recommendation: Vote against proposals to classify (stagger) the board.

Vote for proposals to repeal classified boards and to elect all directors annually.


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CEO Succession Planning

General Recommendation: Generally vote for proposals seeking disclosure on a CEO succession planning policy, considering, at a minimum, the following factors:

◾

The reasonableness/scope of the request; and

◾

The company’s existing disclosure on its current CEO succession planning process.

Cumulative Voting

General Recommendation: Generally vote against management proposals to eliminate cumulate voting, and for shareholder proposals to restore or provide for cumulative voting, unless:

◾

The company has proxy access¹², thereby allowing shareholders to nominate directors to the company’s ballot; and

◾

The company has adopted a majority vote standard, with a carve-out for plurality voting in situations where there are more nominees than seats, and a director resignation policy to address failed elections.

Vote for proposals for cumulative voting at controlled companies (insider voting power > 50%).

Director and Officer Indemnification, Liability Protection, and Exculpation

General Recommendation: Vote case-by-case on proposals on director and officer indemnification, liability protection, and exculpation¹³.

Consider the stated rationale for the proposed change. Also consider, among other factors, the extent to which the proposal would:

◾

Eliminate directors’ and officers’ liability for monetary damages for violating the duty of care;

◾

Eliminate directors’ and officers’ liability for monetary damages for violating the duty of loyalt;

◾

Expand coverage beyond just legal expenses to liability for acts that are more serious violations of fiduciary obligation than mere carelessness; and

◾

Expand the scope of indemnification to provide for mandatory indemnification of company officials in connection with acts that previously the company was permitted to provide indemnification for, at the discretion of the company’s board (i.e., “permissive indemnification”), but that previously the company was not required to indemnify.

Vote for those proposals providing such expanded coverage in cases when a director’s or officer’s legal defense was unsuccessful if both of the following apply:

◾

If the individual was found to have acted in good faith and in a manner that the individual reasonably believed was in the best interests of the company; and

◾

If only the individual’s legal expenses would be covered.

¹² A proxy access right that meets the recommended guidelines.

¹³ Indemnification: the condition of being secured against loss or damage.

Limited liability: a person’s financial liability is limited to a fixed sum, or personal financial assets are not at risk if the individual loses a lawsuit that results in financial award/damages to the plaintiff.

Exculpation: to eliminate or limit the personal liability of a director or officer to the corporation or its shareholders for monetary damages for breach of fiduciary duty as a director or officer.


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Establish/Amend Nominee Qualifications

General Recommendation: Vote case-by-case on proposals that establish or amend director qualifications. Votes should be based on the reasonableness of the criteria and the degree to which they may preclude dissident nominees from joining the board.

Vote case-by-case on shareholder resolutions seeking a director nominee who possesses a particular subject matter expertise, considering:

◾

The company’s board committee structure, existing subject matter expertise, and board nomination provisions relative to that of its peers;

◾

The company’s existing board and management oversight mechanisms regarding the issue for which board oversight is sought;

◾

The company’s disclosure and performance relating to the issue for which board oversight is sought and any significant related controversies; and

◾

The scope and structure of the proposal.

Establish Other Board Committee Proposals

General Recommendation: Generally vote against shareholder proposals to establish a new board committee, as such proposals seek a specific oversight mechanism/structure that potentially limits a company’s flexibility to determine an appropriate oversight mechanism for itself. However, the following factors will be considered:

◾

Existing oversight mechanisms (including current committee structure) regarding the issue for which board oversight is sought;

◾

Level of disclosure regarding the issue for which board oversight is sought;

◾

Company performance related to the issue for which board oversight is sought;

◾

Board committee structure compared to that of other companies in its industry sector; and

◾

The scope and structure of the proposal.

Filling Vacancies/Removal of Directors

General Recommendation: Vote against proposals that provide that directors may be removed only for cause. Vote for proposals to restore shareholders’ ability to remove directors with or without cause.

Vote against proposals that provide that only continuing directors may elect replacements to fill board vacancies.

Vote for proposals that permit shareholders to elect directors to fill board vacancies.

Independent Board Chair

General Recommendation: Generally vote for shareholder proposals requiring that the board chair position be filled by an independent director, taking into consideration the following:

◾

The scope and rationale of the proposal;

◾

The company’s current board leadership structure;

◾

The company’s governance structure and practices;

◾

Company performance; and

◾

Any other relevant factors that may be applicable.


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The following factors will increase the likelihood of a “for” recommendation:

◾

A majority non-independent board and/or the presence of non-independent directors on key board committees;

◾

A weak or poorly-defined lead independent director role that fails to serve as an appropriate counterbalance to a combined CEO/chair role;

◾

The presence of an executive or non-independent chair in addition to the CEO, a recent recombination of the role of CEO and chair, and/or departure from a structure with an independent chair;

◾

Evidence that the board has failed to oversee and address material risks facing the company;

◾

A material governance failure, particularly if the board has failed to adequately respond to shareholder concerns or if the board has materially diminished shareholder rights; or

◾

Evidence that the board has failed to intervene when management’s interests are contrary to shareholders’ interests.

Majority of Independent Directors/Establishment of Independent Committees

General Recommendation: Vote for shareholder proposals asking that a majority or more of directors be independent unless the board composition already meets the proposed threshold by ISS’ definition of Independent Director (See ISS’ Classification of Directors.)

Vote for shareholder proposals asking that board audit, compensation, and/or nominating committees be composed exclusively of independent directors unless they currently meet that standard.

Majority Vote Standard for the Election of Directors

General Recommendation: Generally vote for management proposals to adopt a majority of votes cast standard for directors in uncontested elections. Vote against if no carve-out for a plurality vote standard in contested elections is included.

Generally vote for precatory and binding shareholder resolutions requesting that the board change the company’s bylaws to stipulate that directors need to be elected with an affirmative majority of votes cast, provided it does not conflict with the state law where the company is incorporated. Binding resolutions need to allow for a carve-out for a plurality vote standard when there are more nominees than board seats.

Companies are strongly encouraged to also adopt a post-election policy (also known as a director resignation policy) that will provide guidelines so that the company will promptly address the situation of a holdover director.

Proxy Access

General Recommendation: Generally vote for management and shareholder proposals for proxy access with the following provisions:

◾

Ownership threshold: maximum requirement not more than three percent (3%) of the voting power;

◾

Ownership duration: maximum requirement not longer than three (3) years of continuous ownership for each member of the nominating group;

◾

Aggregation: minimal or no limits on the number of shareholders permitted to form a nominating group; and

◾

Cap: cap on nominees of generally twenty-five percent (25%) of the board.

Review for reasonableness any other restrictions on the right of proxy access. Generally vote against proposals that are more restrictive than these guidelines.


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Require More Nominees than Open Seats

General Recommendation: Vote against shareholder proposals that would require a company to nominate more candidates than the number of open board seats.

Shareholder Engagement Policy (Shareholder Advisory Committee)

General Recommendation: Generally vote for shareholder proposals requesting that the board establish an internal mechanism/process, which may include a committee, in order to improve communications between directors and shareholders, unless the company has the following features, as appropriate:

◾

Established a communication structure that goes beyond the exchange requirements to facilitate the exchange of information between shareholders and members of the board;

◾

Effectively disclosed information with respect to this structure to its shareholders;

◾

Company has not ignored majority-supported shareholder proposals, or a majority withhold vote on a director nominee; and

◾

The company has an independent chair or a lead director, according to ISS’ definition. This individual must be made available for periodic consultation and direct communication with major shareholders.


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2. Audit-Related

Auditor Indemnification and Limitation of Liability

General Recommendation: Vote case-by-case on the issue of auditor indemnification and limitation of liability. Factors to be assessed include, but are not limited to:

◾

The terms of the auditor agreement—the degree to which these agreements impact shareholders’ rights;

◾

The motivation and rationale for establishing the agreements;

◾

The quality of the company’s disclosure; and

◾

The company’s historical practices in the audit area.

Vote against or withhold from members of an audit committee in situations where there is persuasive evidence that the audit committee entered into an inappropriate indemnification agreement with its auditor that limits the ability of the company, or its shareholders, to pursue legitimate legal recourse against the audit firm.

Auditor Ratification

General Recommendation: Vote for proposals to ratify auditors unless any of the following apply:

◾

An auditor has a financial interest in or association with the company, and is therefore not independent;

◾

There is reason to believe that the independent auditor has rendered an opinion that is neither accurate nor indicative of the company’s financial position;

◾

Poor accounting practices are identified that rise to a serious level of concern, such as fraud or misapplication of GAAP; or

◾

Fees for non-audit services (“Other” fees) are excessive.

Non-audit fees are excessive if:

◾

Non-audit (“other”) fees > audit fees + audit-related fees + tax compliance/preparation fees

Tax compliance and preparation include the preparation of original and amended tax returns and refund claims, and tax payment planning. All other services in the tax category, such as tax advice, planning, or consulting, should be added to “Other” fees. If the breakout of tax fees cannot be determined, add all tax fees to “Other” fees.

In circumstances where “Other” fees include fees related to significant one-time capital structure events (such as initial public offerings, bankruptcy emergence, and spin-offs) and the company makes public disclosure of the amount and nature of those fees that are an exception to the standard “non-audit fee” category, then such fees may be excluded from the non-audit fees considered in determining the ratio of non-audit to audit/audit-related fees/tax compliance and preparation for purposes of determining whether non-audit fees are excessive.

Shareholder Proposals Limiting Non-Audit Services

General Recommendation: Vote case-by-case on shareholder proposals asking companies to prohibit or limit their auditors from engaging in non-audit services.

Shareholder Proposals on Audit Firm Rotation

General Recommendation: Vote case-by-case on shareholder proposals asking for audit firm rotation, taking into account:

◾

The tenure of the audit firm;


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The length of rotation specified in the proposal;

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Any significant audit-related issues at the company;

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The number of Audit Committee meetings held each year;

◾

The number of financial experts serving on the committee; and

◾

Whether the company has a periodic renewal process where the auditor is evaluated for both audit quality and competitive price.


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3. Shareholder Rights & Defenses

Advance Notice Requirements for Shareholder Proposals/Nominations

General Recommendation: Vote case-by-case on advance notice proposals, giving support to those proposals which allow shareholders to submit proposals/nominations as close to the meeting date as reasonably possible and within the broadest window possible, recognizing the need to allow sufficient notice for company, regulatory, and shareholder review.

To be reasonable, the company’s deadline for shareholder notice of a proposal/nominations must be no earlier than 120 days prior to the anniversary of the previous year’s meeting and have a submittal window of no shorter than 30 days from the beginning of the notice period (also known as a 90-120-day window). The submittal window is the period under which shareholders must file their proposals/nominations prior to the deadline.

In general, support additional efforts by companies to ensure full disclosure in regard to a proponent’s economic and voting position in the company so long as the informational requirements are reasonable and aimed at providing shareholders with the necessary information to review such proposals.

Amend Bylaws without Shareholder Consent

General Recommendation: Vote against proposals giving the board exclusive authority to amend the bylaws.

Vote case-by-case on proposals giving the board the ability to amend the bylaws in addition to shareholders, taking into account the following:

◾

Any impediments to shareholders’ ability to amend the bylaws (i.e. supermajority voting requirements);

◾

The company’s ownership structure and historical voting turnout;

◾

Whether the board could amend bylaws adopted by shareholders; and

◾

Whether shareholders would retain the ability to ratify any board-initiated amendments.

Control Share Acquisition Provisions

General Recommendation: Vote for proposals to opt out of control share acquisition statutes unless doing so would enable the completion of a takeover that would be detrimental to shareholders.

Vote against proposals to amend the charter to include control share acquisition provisions.

Vote for proposals to restore voting rights to the control shares.

Control share acquisition statutes function by denying shares their voting rights when they contribute to ownership in excess of certain thresholds. Voting rights for those shares exceeding ownership limits may only be restored by approval of either a majority or supermajority of disinterested shares. Thus, control share acquisition statutes effectively require a hostile bidder to put its offer to a shareholder vote or risk voting disenfranchisement if the bidder continues buying up a large block of shares.

Control Share Cash-Out Provisions

General Recommendation: Vote for proposals to opt out of control share cash-out statutes.


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Control share cash-out statutes give dissident shareholders the right to “cash-out” of their position in a company at the expense of the shareholder who has taken a control position. In other words, when an investor crosses a preset threshold level, remaining shareholders are given the right to sell their shares to the acquirer, who must buy them at the highest acquiring price.

Disgorgement Provisions

General Recommendation: Vote for proposals to opt out of state disgorgement provisions.

Disgorgement provisions require an acquirer or potential acquirer of more than a certain percentage of a company’s stock to disgorge, or pay back, to the company any profits realized from the sale of that company’s stock purchased 24 months before achieving control status. All sales of company stock by the acquirer occurring within a certain period of time (between 18 months and 24 months) prior to the investor’s gaining control status are subject to these recapture-of-profits provisions.

Fair Price Provisions

General Recommendation: Vote case-by-case on proposals to adopt fair price provisions (provisions that stipulate that an acquirer must pay the same price to acquire all shares as it paid to acquire the control shares), evaluating factors such as the vote required to approve the proposed acquisition, the vote required to repeal the fair price provision, and the mechanism for determining the fair price.

Generally vote against fair price provisions with shareholder vote requirements greater than a majority of disinterested shares.

Freeze-Out Provisions

General Recommendation: Vote for proposals to opt out of state freeze-out provisions. Freeze-out provisions force an investor who surpasses a certain ownership threshold in a company to wait a specified period of time before gaining control of the company.

Greenmail

General Recommendation: Vote for proposals to adopt anti-greenmail charter or bylaw amendments or otherwise restrict a company’s ability to make greenmail payments.

Vote case-by-case on anti-greenmail proposals when they are bundled with other charter or bylaw amendments.

Greenmail payments are targeted share repurchases by management of company stock from individuals or groups seeking control of the company. Since only the hostile party receives payment, usually at a substantial premium over the market value of its shares, the practice discriminates against all other shareholders.

Shareholder Litigation Rights

Federal Forum Selection Provisions

Federal forum selection provisions require that U.S. federal courts be the sole forum for shareholders to litigate claims arising under federal securities law.


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General Recommendation: Generally vote for federal forum selection provisions in the charter or bylaws that specify “the district courts of the United States” as the exclusive forum for federal securities law matters, in the absence of serious concerns about corporate governance or board responsiveness to shareholders.

Vote against provisions that restrict the forum to a particular federal district court; unilateral adoption (without a shareholder vote) of such a provision will generally be considered a one-time failure under the Unilateral Bylaw/Charter Amendments policy.

Exclusive Forum Provisions for State Law Matters

Exclusive forum provisions in the charter or bylaws restrict shareholders’ ability to bring derivative lawsuits against the company, for claims arising out of state corporate law, to the courts of a particular state (generally the state of incorporation).

General Recommendation: Generally vote for charter or bylaw provisions that specify courts located within the state of Delaware as the exclusive forum for corporate law matters for Delaware corporations, in the absence of serious concerns about corporate governance or board responsiveness to shareholders.

For states other than Delaware, vote case-by-case on exclusive forum provisions, taking into consideration:

◾

The company’s stated rationale for adopting such a provision;

◾

Disclosure of past harm from duplicative shareholder lawsuits in more than one forum;

◾

The breadth of application of the charter or bylaw provision, including the types of lawsuits to which it would apply and the definition of key terms; and

◾

Governance features such as shareholders’ ability to repeal the provision at a later date (including the vote standard applied when shareholders attempt to amend the charter or bylaws) and their ability to hold directors accountable through annual director elections and a majority vote standard in uncontested elections.

Generally vote against provisions that specify a state other than the state of incorporation as the exclusive forum for corporate law matters, or that specify a particular local court within the state; unilateral adoption of such a provision will generally be considered a one-time failure under the Unilateral Bylaw/Charter Amendments policy.

Fee shifting

Fee-shifting provisions in the charter or bylaws require that a shareholder who sues a company unsuccessfully pay all litigation expenses of the defendant corporation and its directors and officers.

General Recommendation: Generally vote against provisions that mandate fee-shifting whenever plaintiffs are not completely successful on the merits (i.e., including cases where the plaintiffs are partially successful).

Unilateral adoption of a fee-shifting provision will generally be considered an ongoing failure under the Unilateral Bylaw/Charter Amendments policy.

Net Operating Loss (NOL) Protective Amendments

General Recommendation: Vote against proposals to adopt a protective amendment for the stated purpose of protecting a company’s net operating losses (NOL) if the effective term of the protective amendment would exceed the shorter of three years and the exhaustion of the NOL.


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Vote case-by-case, considering the following factors, for management proposals to adopt an NOL protective amendment that would remain in effect for the shorter of three years (or less) and the exhaustion of the NOL:

◾

The ownership threshold (NOL protective amendments generally prohibit stock ownership transfers that would result in a new 5-percent holder or increase the stock ownership percentage of an existing 5-percent holder);

◾

The value of the NOLs;

◾

Shareholder protection mechanisms (sunset provision or commitment to cause expiration of the protective amendment upon exhaustion or expiration of the NOL);

◾

The company’s existing governance structure including: board independence, existing takeover defenses, track record of responsiveness to shareholders, and any other problematic governance concerns; and

◾

Any other factors that may be applicable.

Poison Pills (Shareholder Rights Plans)

Shareholder Proposals to Put Pill to a Vote and/or Adopt a Pill Policy

General Recommendation: Vote for shareholder proposals requesting that the company submit its poison pill to a shareholder vote or redeem it unless the company has: (1) A shareholder-approved poison pill in place; or (2) The company has adopted a policy concerning the adoption of a pill in the future specifying that the board will only adopt a shareholder rights plan if either:

◾

Shareholders have approved the adoption of the plan; or

◾

The board, in its exercise of its fiduciary responsibilities, determines that it is in the best interest of shareholders under the circumstances to adopt a pill without the delay in adoption that would result from seeking stockholder approval (i.e., the “fiduciary out” provision). A poison pill adopted under this fiduciary out will be put to a shareholder ratification vote within 12 months of adoption or expire. If the pill is not approved by a majority of the votes cast on this issue, the plan will immediately terminate.

If the shareholder proposal calls for a time period of less than 12 months for shareholder ratification after adoption, vote for the proposal, but add the caveat that a vote within 12 months would be considered sufficient implementation.

Management Proposals to Ratify a Poison Pill

General Recommendation: Vote case-by-case on management proposals on poison pill ratification, focusing on the features of the shareholder rights plan. Rights plans should contain the following attributes:

◾

No lower than a 20 percent trigger, flip-in or flip-over;

◾

A term of no more than three years;

◾

No deadhand, slowhand, no-hand, or similar feature that limits the ability of a future board to redeem the pill; and

◾

Shareholder redemption feature (qualifying offer clause); if the board refuses to redeem the pill 90 days after a qualifying offer is announced, 10 percent of the shares may call a special meeting or seek a written consent to vote on rescinding the pill.

In addition, the rationale for adopting the pill should be thoroughly explained by the company. In examining the request for the pill, take into consideration the company’s existing governance structure, including: board independence, existing takeover defenses, and any problematic governance concerns.

Management Proposals to Ratify a Pill to Preserve Net Operating Losses (NOLs)

General Recommendation: Vote against proposals to adopt a poison pill for the stated purpose of protecting a company’s net operating losses (NOL) if the term of the pill would exceed the shorter of three years and the exhaustion of the NOL.


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Vote case-by-case on management proposals for poison pill ratification, considering the following factors, if the term of the pill would be the shorter of three years (or less) and the exhaustion of the NOL:

◾

The ownership threshold to transfer (NOL pills generally have a trigger slightly below 5 percent);

◾

The value of the NOLs;

◾

Shareholder protection mechanisms (sunset provision, or commitment to cause expiration of the pill upon exhaustion or expiration of NOLs);

◾

The company’s existing governance structure, including: board independence, existing takeover defenses, track record of responsiveness to shareholders, and any other problematic governance concerns; and

◾

Any other factors that may be applicable.

Proxy Voting Disclosure, Confidentiality, and Tabulation

General Recommendation: Vote case-by-case on proposals regarding proxy voting mechanics, taking into consideration whether implementation of the proposal is likely to enhance or protect shareholder rights. Specific issues covered under the policy include, but are not limited to, confidential voting of individual proxies and ballots, confidentiality of running vote tallies, and the treatment of abstentions and/or broker non-votes in the company’s vote-counting methodology.

While a variety of factors may be considered in each analysis, the guiding principles are: transparency, consistency, and fairness in the proxy voting process. The factors considered, as applicable to the proposal, may include:

◾

The scope and structure of the proposal;

◾

The company’s stated confidential voting policy (or other relevant policies) and whether it ensures a “level playing field” by providing shareholder proponents with equal access to vote information prior to the annual meeting;

◾

The company’s vote standard for management and shareholder proposals and whether it ensures consistency and fairness in the proxy voting process and maintains the integrity of vote results;

◾

Whether the company’s disclosure regarding its vote counting method and other relevant voting policies with respect to management and shareholder proposals are consistent and clear;

◾

Any recent controversies or concerns related to the company’s proxy voting mechanics;

◾

Any unintended consequences resulting from implementation of the proposal; and

◾

Any other factors that may be relevant.

Ratification Proposals: Management Proposals to Ratify Existing Charter or Bylaw Provisions

General Recommendation: Generally vote against management proposals to ratify provisions of the company’s existing charter or bylaws, unless these governance provisions align with best practice.

In addition, voting against/withhold from individual directors, members of the governance committee, or the full board may be warranted, considering:

◾

The presence of a shareholder proposal addressing the same issue on the same ballot;

◾

The board’s rationale for seeking ratification;

◾

Disclosure of actions to be taken by the board should the ratification proposal fail;

◾

Disclosure of shareholder engagement regarding the board’s ratification request;

◾

The level of impairment to shareholders’ rights caused by the existing provision;

◾

The history of management and shareholder proposals on the provision at the company’s past meetings;

◾

Whether the current provision was adopted in response to the shareholder proposal;


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The company’s ownership structure; and

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Previous use of ratification proposals to exclude shareholder proposals.

Reimbursing Proxy Solicitation Expenses

General Recommendation: Vote case-by-case on proposals to reimburse proxy solicitation expenses.

When voting in conjunction with support of a dissident slate, vote for the reimbursement of all appropriate proxy solicitation expenses associated with the election.

Generally vote for shareholder proposals calling for the reimbursement of reasonable costs incurred in connection with nominating one or more candidates in a contested election where the following apply:

◾

The election of fewer than 50 percent of the directors to be elected is contested in the election;

◾

One or more of the dissident’s candidates is elected;

◾

Shareholders are not permitted to cumulate their votes for directors; and

◾

The election occurred, and the expenses were incurred, after the adoption of this bylaw.

Reincorporation Proposals

General Recommendation: Management or shareholder proposals to change a company’s state of incorporation should be evaluated case-by-case, giving consideration to both financial and corporate governance concerns including the following:

◾

Reasons for reincorporation;

◾

Comparison of company’s governance practices and provisions prior to and following the reincorporation; and

◾

Comparison of corporation laws of original state and destination state.

Vote for reincorporation when the economic factors outweigh any neutral or negative governance changes.

Shareholder Ability to Act by Written Consent

General Recommendation: Generally vote against management and shareholder proposals to restrict or prohibit shareholders’ ability to act by written consent.

Generally vote for management and shareholder proposals that provide shareholders with the ability to act by written consent, taking into account the following factors:

◾

Shareholders’ current right to act by written consent;

◾

The consent threshold;

◾

The inclusion of exclusionary or prohibitive language;

◾

Investor ownership structure; and

◾

Shareholder support of, and management’s response to, previous shareholder proposals.

Vote case-by-case on shareholder proposals if, in addition to the considerations above, the company has the following governance and antitakeover provisions:

◾

An unfettered¹⁴ right for shareholders to call special meetings at a 10 percent threshold;

◾

A majority vote standard in uncontested director elections;

¹⁴ quality of the company’s disclosure; and “Unfettered” means no restrictions on agenda items, no restrictions on the number of shareholders who can group together to reach the 10 percent threshold, and only reasonable limits on when a meeting can be called: no greater than 30 days after the last annual meeting and no greater than 90 prior to the next annual meeting.


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No non-shareholder-approved pill; and

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An annually elected board.

Shareholder Ability to Call Special Meetings

General Recommendation: Vote against management or shareholder proposals to restrict or prohibit shareholders’ ability to call special meetings.

Generally vote for management or shareholder proposals that provide shareholders with the ability to call special meetings taking into account the following factors:

◾

Shareholders’ current right to call special meetings;

◾

Minimum ownership threshold necessary to call special meetings (10 percent preferred);

◾

The inclusion of exclusionary or prohibitive language;

◾

Investor ownership structure; and

◾

Shareholder support of, and management’s response to, previous shareholder proposals.

Stakeholder Provisions

General Recommendation: Vote against proposals that ask the board to consider non-shareholder constituencies or other non-financial effects when evaluating a merger or business combination.

State Antitakeover Statutes

General Recommendation: Vote case-by-case on proposals to opt in or out of state takeover statutes (including fair price provisions, stakeholder laws, poison pill endorsements, severance pay and labor contract provisions, and anti-greenmail provisions).

Supermajority Vote Requirements

General Recommendation: Vote against proposals to require a supermajority shareholder vote.

Vote for management or shareholder proposals to reduce supermajority vote requirements. However, for companies with shareholder(s) who have significant ownership levels, vote case-by-case, taking into account:

◾

Ownership structure;

◾

Quorum requirements; and

◾

Vote requirements.

Virtual Shareholder Meetings

General Recommendation: Generally vote for management proposals allowing for the convening of shareholder meetings by electronic means, so long as they do not preclude in-person meetings. Companies are encouraged to disclose the circumstances under which virtual-only¹⁵ meetings would be held, and to allow for comparable rights and opportunities for shareholders to participate electronically as they would have during an in-person meeting.

¹⁵ Virtual-only shareholder meeting” refers to a meeting of shareholders that is held exclusively using technology without a corresponding in-person meeting.


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Vote case-by-case on shareholder proposals concerning virtual-only meetings, considering:

◾

Scope and rationale of the proposal; and

◾

Concerns identified with the company’s prior meeting practices.

4. Capital/Restructuring

Capital

Adjustments to Par Value of Common Stock

General Recommendation: Vote for management proposals to reduce the par value of common stock unless the action is being taken to facilitate an anti-takeover device or some other negative corporate governance action.

Vote for management proposals to eliminate par value.

Common Stock Authorization

General Authorization Requests

General Recommendation: Vote case-by-case on proposals to increase the number of authorized shares of common stock that are to be used for general corporate purposes:

◾

If share usage (outstanding plus reserved) is less than 50% of the current authorized shares, vote for an increase of up to 50% of current authorized share;

◾

If share usage is 50% to 100% of the current authorized, vote for an increase of up to 100% of current authorized shares;

◾

If share usage is greater than current authorized shares, vote for an increase of up to the current share usage; or

◾

In the case of a stock split, the allowable increase is calculated (per above) based on the post-split adjusted authorization.

Generally vote against proposed increases, even if within the above ratios, if the proposal or the company’s prior or ongoing use of authorized shares is problematic, including, but not limited to:

◾

The proposal seeks to increase the number of authorized shares of the class of common stock that has superior voting rights to other share classes;

◾

On the same ballot is a proposal for a reverse split for which support is warranted despite the fact that it would result in an excessive increase in the share authorization;

◾

The company has a non-shareholder approved poison pill (including an NOL pill); or

◾

The company has previous sizeable placements (within the past 3 years) of stock with insiders at prices substantially below market value, or with problematic voting rights, without shareholder approval.

However, generally vote for proposed increases beyond the above ratios or problematic situations when there is disclosure of specific and severe risks to shareholders of not approving the request, such as:

◾

In, or subsequent to, the company’s most recent 10-K filing, the company discloses that there is substantial doubt about its ability to continue as a going concern;

◾

The company states that there is a risk of imminent bankruptcy or imminent liquidation if shareholders do not approve the increase in authorized capital; or

◾

A government body has in the past year required the company to increase its capital ratios.


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For companies incorporated in states that allow increases in authorized capital without shareholder approval, generally vote withhold or against all nominees if a unilateral capital authorization increase does not conform to the above policies.

Specific Authorization Requests

General Recommendation: Generally vote for proposals to increase the number of authorized common shares where the primary purpose of the increase is to issue shares in connection with transaction(s) (such as acquisitions, SPAC transactions, private placements, or similar transactions) on the same ballot, or disclosed in the proxy statement, that warrant support. For such transactions, the allowable increase will be the greater of:

◾

twice the amount needed to support the transactions on the ballot, and

◾

the allowable increase as calculated for general issuances above.

Dual Class Structure

General Recommendation: Generally vote against proposals to create a new class of common stock unless:

◾

The company discloses a compelling rationale for the dual-class capital structure, such as:

◾

The company’s auditor has concluded that there is substantial doubt about the company’s ability to continue as a going concern; or

◾

The new class of shares will be transitory;

◾

The new class is intended for financing purposes with minimal or no dilution to current shareholders in both the short term and long term; and

◾

The new class is not designed to preserve or increase the voting power of an insider or significant shareholder.

Issue Stock for Use with Rights Plan

General Recommendation: Vote against proposals that increase authorized common stock for the explicit purpose of implementing a non-shareholder-approved shareholder rights plan (poison pill).

Preemptive Rights

General Recommendation: Vote case-by-case on shareholder proposals that seek preemptive rights, taking into consideration:

◾

The size of the company;

◾

The shareholder base; and

◾

The liquidity of the stock.

Preferred Stock Authorization

General Authorization Requests

General Recommendation: Vote case-by-case on proposals to increase the number of authorized shares of preferred stock that are to be used for general corporate purposes:

◾

If share usage (outstanding plus reserved) is less than 50% of the current authorized shares, vote for an increase of up to 50% of current authorized shares;


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If share usage is 50% to 100% of the current authorized, vote for an increase of up to 100% of current authorized shares;

◾

If share usage is greater than current authorized shares, vote for an increase of up to the current share usage.

◾

In the case of a stock split, the allowable increase is calculated (per above) based on the post-split adjusted authorization; or

◾

If no preferred shares are currently issued and outstanding, vote against the request, unless the company discloses a specific use for the shares.

Generally vote against proposed increases, even if within the above ratios, if the proposal or the company’s prior or ongoing use of authorized shares is problematic, including, but not limited to:

◾

If the shares requested are blank check preferred shares that can be used for antitakeover purposes;¹⁶

◾

The company seeks to increase a class of non-convertible preferred shares entitled to more than one vote per share on matters that do not solely affect the rights of preferred stockholders “supervoting shares”);

◾

The company seeks to increase a class of convertible preferred shares entitled to a number of votes greater than the number of common shares into which they are convertible (“supervoting shares”) on matters that do not solely affect the rights of preferred stockholders;

◾

The stated intent of the increase in the general authorization is to allow the company to increase an existing designated class of supervoting preferred shares;

◾

On the same ballot is a proposal for a reverse split for which support is warranted despite the fact that it would result in an excessive increase in the share authorization;

◾

The company has a non-shareholder approved poison pill (including an NOL pill); and

◾

In, or subsequent to, the company’s most recent 10-K filing, the company discloses that there is substantial doubt about its ability to continue as a going concern;

◾

The company states that there is a risk of imminent bankruptcy or imminent liquidation if shareholders do not approve the increase in authorized capital; or

◾

A government body has in the past year required the company to increase its capital ratios.

Specific Authorization Requests

General Recommendation: Generally vote for proposals to increase the number of authorized preferred shares where the primary purpose of the increase is to issue shares in connection with transaction(s) (such as acquisitions, SPAC transactions, private placements, or similar transactions) on the same ballot, or disclosed in the proxy statement, that warrant support. For such transactions, the allowable increase will be the greater of:

◾

twice the amount needed to support the transactions on the ballot, and

◾

the allowable increase as calculated for general issuances above.

¹⁶ To be acceptable, appropriate disclosure would be needed that the shares are “declawed”: i.e., representation by the board that it will not, without prior stockholder approval, issue or use the preferred stock for any defensive or anti-takeover purpose or for the purpose of implementing any stockholder rights plan.


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Recapitalization Plans

General Recommendation: Vote case-by-case on recapitalizations (reclassifications of securities), taking into account the following:

◾

More simplified capital structure;

◾

Enhanced liquidity;

◾

Fairness of conversion terms;

◾

Impact on voting power and dividends;

◾

Reasons for the reclassification;

◾

Conflicts of interest; and

◾

Other alternatives considered.

Reverse Stock Splits

General Recommendation: Vote for management proposals to implement a reverse stock split if:

◾

The number of authorized shares will be proportionately reduced; or

◾

The effective increase in authorized shares is equal to or less than the allowable increase calculated in accordance with ISS’ Common Stock Authorization policy.

Vote case-by-case on proposals that do not meet either of the above conditions, taking into consideration the following factors:

◾

Stock exchange notification to the company of a potential delisting;

◾

Disclosure of substantial doubt about the company’s ability to continue as a going concern without additional financing;

◾

The company’s rationale; or

◾

Other factors as applicable.

Share Issuance Mandates at U.S. Domestic Issuers Incorporated Outside the U.S.

General Recommendation: For U.S. domestic issuers incorporated outside the U.S. and listed solely on a U.S. exchange, generally vote for resolutions to authorize the issuance of common shares up to 20 percent of currently issued common share capital, where not tied to a specific transaction or financing proposal.

For pre-revenue or other early-stage companies that are heavily reliant on periodic equity financing, generally vote for resolutions to authorize the issuance of common shares up to 50 percent of currently issued common share capital. The burden of proof will be on the company to establish that it has a need for the higher limit.

Renewal of such mandates should be sought at each year’s annual meeting.

Vote case-by-case on share issuances for a specific transaction or financing proposal.

Share Repurchase Programs

General Recommendation: For U.S.-incorporated companies, and foreign-incorporated U.S. Domestic Issuers that are traded solely on U.S. exchanges, vote for management proposals to institute open-market share repurchase plans in which all shareholders may participate on equal terms, or to grant the board authority to conduct open-market repurchases, in the absence of company-specific concerns regarding:

◾

Greenmail;


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The use of buybacks to inappropriately manipulate incentive compensation metrics;

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Threats to the company’s long-term viability; or

◾

Other company-specific factors as warranted.

Vote case-by-case on proposals to repurchase shares directly from specified shareholders, balancing the stated rationale against the possibility for the repurchase authority to be misused, such as to repurchase shares from insiders at a premium to market price.

Share Repurchase Programs Shareholder Proposals

General Recommendation: Generally vote against shareholder proposals prohibiting executives from selling shares of company stock during periods in which the company has announced that it may or will be repurchasing shares of its stock. Vote for the proposal when there is a pattern of abuse by executives exercising options or selling shares during periods of share buybacks.

Stock Distributions: Splits and Dividends

General Recommendation: Generally vote for management proposals to increase the common share authorization for stock split or stock dividend, provided that the effective increase in authorized shares is equal to or is less than the allowable increase calculated in accordance with ISS’ Common Stock Authorization policy.

Tracking Stock

General Recommendation: Vote case-by-case on the creation of tracking stock, weighing the strategic value of the transaction against such factors as:

◾

Adverse governance changes;

◾

Excessive increases in authorized capital stock;

◾

Unfair method of distribution;

◾

Diminution of voting rights;

◾

Adverse conversion features;

◾

Negative impact on stock option plans; and

◾

Alternatives such as spin-off.

Restructuring

Appraisal Rights

General Recommendation: Vote for proposals to restore or provide shareholders with rights of appraisal.

Asset Purchases

General Recommendation: Vote case-by-case on asset purchase proposals, considering the following factors:

◾

Purchase price;

◾

Fairness opinion;

◾

Financial and strategic benefits;

◾

How the deal was negotiated;


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Conflicts of interest;

◾

Other alternatives for the business; and

◾

Non-completion risk.

Asset Sales

General Recommendation: Vote case-by-case on asset sales, considering the following factors:

◾

Impact on the balance sheet/working capital;

◾

Potential elimination of diseconomies;

◾

Anticipated financial and operating benefits;

◾

Anticipated use of funds;

◾

Value received for the asset;

◾

Fairness opinion;

◾

How the deal was negotiated; and

◾

Conflicts of interest.

Bundled Proposals

General Recommendation: Vote case-by-case on bundled or “conditional” proxy proposals. In the case of items that are conditioned upon each other, examine the benefits and costs of the packaged items. In instances when the joint effect of the conditioned items is not in shareholders’ best interests, vote against the proposals. If the combined effect is positive, support such proposals.

Conversion of Securities

General Recommendation: Vote case-by-case on proposals regarding conversion of securities. When evaluating these proposals, the investor should review the dilution to existing shareholders, the conversion price relative to market value, financial issues, control issues, termination penalties, and conflicts of interest.

Vote for the conversion if it is expected that the company will be subject to onerous penalties or will be forced to file for bankruptcy if the transaction is not approved.

Corporate Reorganization/Debt Restructuring/Prepackaged Bankruptcy

Plans/Reverse Leveraged Buyouts/Wrap Plans

General Recommendation: Vote case-by-case on proposals to increase common and/or preferred shares and to issue shares as part of a debt restructuring plan, after evaluating:

◾

Dilution to existing shareholders’ positions;

◾

Terms of the offer - discount/premium in purchase price to investor, including any fairness opinion; termination penalties; exit strategy;

◾

Financial issues - company’s financial situation; degree of need for capital; use of proceeds; effect of the financing on the company’s cost of capital;

◾

Management’s efforts to pursue other alternatives;

◾

Control issues - change in management; change in control, guaranteed board and committee seats; standstill provisions; voting agreements; veto power over certain corporate actions; and

◾

Conflict of interest - arm’s length transaction, managerial incentives.


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Vote for the debt restructuring if it is expected that the company will file for bankruptcy if the transaction is not approved.

Formation of Holding Company

General Recommendation: Vote case-by-case on proposals regarding the formation of a holding company, taking into consideration the following:

◾

The reasons for the change;

◾

Any financial or tax benefits;

◾

Regulatory benefits;

◾

Increases in capital structure; and

◾

Changes to the articles of incorporation or bylaws of the company.

Absent compelling financial reasons to recommend for the transaction, vote against the formation of a holding company if the transaction would include either of the following:

◾

Increases in common or preferred stock in excess of the allowable maximum (see discussion under “Capital”); or

◾

Adverse changes in shareholder rights.

Going Private and Going Dark Transactions (LBOs and Minority Squeeze-outs)

General Recommendation: Vote case-by-case on going private transactions, taking into account the following:

◾

Offer price/premium;

◾

Fairness opinion;

◾

How the deal was negotiated;

◾

Conflicts of interest;

◾

Other alternatives/offers considered; and

◾

Non-completion risk.

Vote case-by-case on going dark transactions, determining whether the transaction enhances shareholder value by taking into consideration:

◾

Whether the company has attained benefits from being publicly-traded (examination of trading volume, liquidity, and market research of the stock); and

◾

Balanced interests of continuing vs. cashed-out shareholders, taking into account the following:

◾

Are all shareholders able to participate in the transaction?

◾

Will there be a liquid market for remaining shareholders following the transaction?

◾

Does the company have strong corporate governance?

◾

Will insiders reap the gains of control following the proposed transaction? and

◾

Does the state of incorporation have laws requiring continued reporting that may benefit shareholders?

Joint Ventures

General Recommendation: Vote case-by-case on proposals to form joint ventures, taking into account the following:

◾

Percentage of assets/business contributed;

◾

Percentage ownership;


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Financial and strategic benefits;

◾

Governance structure;

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Conflicts of interest;

◾

Other alternatives; and

◾

Non-completion risk.

Liquidations

General Recommendation: Vote case-by-case on liquidations, taking into account the following:

◾

Management’s efforts to pursue other alternatives;

◾

Appraisal value of assets; and

◾

The compensation plan for executives managing the liquidation.

Vote for the liquidation if the company will file for bankruptcy if the proposal is not approved.

Mergers and Acquisitions

General Recommendation: Vote case-by-case on mergers and acquisitions. Review and evaluate the merits and drawbacks of the proposed transaction, balancing various and sometimes countervailing factors including:

◾

Valuation - Is the value to be received by the target shareholders (or paid by the acquirer) reasonable? While the fairness opinion may provide an initial starting point for assessing valuation reasonableness, emphasis is placed on the offer premium, market reaction, and strategic rationale.

◾

Market reaction - How has the market responded to the proposed deal? A negative market reaction should cause closer scrutiny of a deal.

◾

Strategic rationale - Does the deal make sense strategically? From where is the value derived? Cost and revenue synergies should not be overly aggressive or optimistic, but reasonably achievable. Management should also have a favorable track record of successful integration of historical acquisitions.

◾

Negotiations and process - Were the terms of the transaction negotiated at arm’s-length? Was the process fair and equitable? A fair process helps to ensure the best price for shareholders. Significant negotiation “wins” can also signify the deal makers’ competency. The comprehensiveness of the sales process (e.g., full auction, partial auction, no auction) can also affect shareholder value.

◾

Conflicts of interest - Are insiders benefiting from the transaction disproportionately and inappropriately as compared to non-insider shareholders? As the result of potential conflicts, the directors and officers of the company may be more likely to vote to approve a merger than if they did not hold these interests. Consider whether these interests may have influenced these directors and officers to support or recommend the merger. The CIC figure presented in the “ISS Transaction Summary” section of this report is an aggregate figure that can in certain cases be a misleading indicator of the true value transfer from shareholders to insiders. Where such figure appears to be excessive, analyze the underlying assumptions to determine whether a potential conflict exists.

◾

Governance - Will the combined company have a better or worse governance profile than the current governance profiles of the respective parties to the transaction? If the governance profile is to change for the worse, the burden is on the company to prove that other issues (such as valuation) outweigh any deterioration in governance.


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Private Placements/Warrants/Convertible Debentures

General Recommendation: Vote case-by-case on proposals regarding private placements, warrants, and convertible debentures taking into consideration:

◾

Dilution to existing shareholders’ position: The amount and timing of shareholder ownership dilution should be weighed against the needs and proposed shareholder benefits of the capital infusion. Although newly issued common stock, absent preemptive rights, is typically dilutive to existing shareholders, share price appreciation is often the necessary event to trigger the exercise of “out of the money” warrants and convertible debt. In these instances from a value standpoint, the negative impact of dilution is mitigated by the increase in the company’s stock price that must occur to trigger the dilutive event.

◾

Terms of the offer (discount/premium in purchase price to investor, including any fairness opinion, conversion features, termination penalties, exit strategy):

◾

The terms of the offer should be weighed against the alternatives of the company and in light of company’s financial condition. Ideally, the conversion price for convertible debt and the exercise price for warrants should be at a premium to the then prevailing stock price at the time of private placement.

◾

When evaluating the magnitude of a private placement discount or premium, consider factors that influence the discount or premium, such as, liquidity, due diligence costs, control and monitoring costs, capital scarcity, information asymmetry, and anticipation of future performance.

◾

Financial issues:

◾

The company’s financial condition;

◾

Degree of need for capital;

◾

Use of proceeds;

◾

Effect of the financing on the company’s cost of capital;

◾

Current and proposed cash burn rate; and

◾

Going concern viability and the state of the capital and credit markets.

◾

Management’s efforts to pursue alternatives and whether the company engaged in a process to evaluate alternatives: A fair, unconstrained process helps to ensure the best price for shareholders. Financing alternatives can include joint ventures, partnership, merger, or sale of part or all of the company.

◾

Control issues:

◾

Change in management;

◾

Change in control;

◾

Guaranteed board and committee seats;

◾

Standstill provisions;

◾

Voting agreements;

◾

Veto power over certain corporate actions; and

◾

Minority versus majority ownership and corresponding minority discount or majority control premium.

◾

Conflicts of interest:

◾

Conflicts of interest should be viewed from the perspective of the company and the investor; and

◾

Were the terms of the transaction negotiated at arm’s length? Are managerial incentives aligned with shareholder interests?

◾

Market reaction:

◾

The market’s response to the proposed deal. A negative market reaction is a cause for concern. Market reaction may be addressed by analyzing the one-day impact on the unaffected stock price.


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Vote for the private placement, or for the issuance of warrants and/or convertible debentures in a private placement, if it is expected that the company will file for bankruptcy if the transaction is not approved.

Reorganization/Restructuring Plan (Bankruptcy)

General Recommendation: Vote case-by-case on proposals to common shareholders on bankruptcy plans of reorganization, considering the following factors including, but not limited to:

◾

Estimated value and financial prospects of the reorganized company;

◾

Percentage ownership of current shareholders in the reorganized company;

◾

Whether shareholders are adequately represented in the reorganization process (particularly through the existence of an Official Equity Committee);

◾

The cause(s) of the bankruptcy filing, and the extent to which the plan of reorganization addresses the cause(s);

◾

Existence of a superior alternative to the plan of reorganization; and

◾

Governance of the reorganized company.

Special Purpose Acquisition Corporations (SPACs)

General Recommendation: Vote case-by-case on SPAC mergers and acquisitions taking into account the following:

◾

Valuation - Is the value being paid by the SPAC reasonable? SPACs generally lack an independent fairness opinion and the financials on the target may be limited. Compare the conversion price with the intrinsic value of the target company provided in the fairness opinion. Also, evaluate the proportionate value of the combined entity attributable to the SPAC IPO shareholders versus the pre-merger value of SPAC. Additionally, a private company discount may be applied to the target if it is a private entity.

◾

Market reaction - How has the market responded to the proposed deal? A negative market reaction may be a cause for concern. Market reaction may be addressed by analyzing the one-day impact on the unaffected stock price.

◾

Deal timing - A main driver for most transactions is that the SPAC charter typically requires the deal to be complete within 18 to 24 months, or the SPAC is to be liquidated. Evaluate the valuation, market reaction, and potential conflicts of interest for deals that are announced close to the liquidation date.

◾

Negotiations and process - What was the process undertaken to identify potential target companies within specified industry or location specified in charter? Consider the background of the sponsors.

◾

Conflicts of interest - How are sponsors benefiting from the transaction compared to IPO shareholders? Potential conflicts could arise if a fairness opinion is issued by the insiders to qualify the deal rather than a third party or if management is encouraged to pay a higher price for the target because of an 80 percent rule (the charter requires that the fair market value of the target is at least equal to 80 percent of net assets of the SPAC). Also, there may be sense of urgency by the management team of the SPAC to close the deal since its charter typically requires a transaction to be completed within the 18-24-month timeframe.

◾

Voting agreements - Are the sponsors entering into enter into any voting agreements/tender offers with shareholders who are likely to vote against the proposed merger or exercise conversion rights?

◾

Governance - What is the impact of having the SPAC CEO or founder on key committees following the proposed merger?

Special Purpose Acquisition Corporations (SPACs) - Proposals for Extensions

The main purpose of SPACs is to identify and acquire a viable target within a specified timeframe, and failure to achieve this objective within the allotted time calls into question management’s ability to execute its primary objective. The end of that timeframe is generally referred to as the termination date.


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General Recommendation: Generally support requests to extend the termination date by up to one year from the SPAC’s original termination date (inclusive of any built-in extension options, and accounting for prior extension requests).

Other factors that may be considered include: any added incentives, business combination status, other amendment terms, and, if applicable, use of money in the trust fund to pay excise taxes on redeemed shares.

Spin-offs

General Recommendation: Vote case-by-case on spin-offs, considering:

◾

Tax and regulatory advantages;

◾

Planned use of the sale proceeds;

◾

Valuation of spinoff;

◾

Fairness opinion;

◾

Benefits to the parent company;

◾

Conflicts of interest;

◾

Managerial incentives;

◾

Corporate governance changes; and

◾

Changes in the capital structure.

Value Maximization Shareholder Proposals

General Recommendation: Vote case-by-case on shareholder proposals seeking to maximize shareholder value by:

◾

Hiring a financial advisor to explore strategic alternatives;

◾

Selling the company; or

◾

Liquidating the company and distributing the proceeds to shareholders.

These proposals should be evaluated based on the following factors:

◾

Prolonged poor performance with no turnaround in sight;

◾

Signs of entrenched board and management (such as the adoption of takeover defenses);

◾

Strategic plan in place for improving value;

◾

Likelihood of receiving reasonable value in a sale or dissolution; and

◾

The company actively exploring its strategic options, including retaining a financial advisor.


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5. Compensation

Executive Pay Evaluation

Underlying all evaluations are five global principles that most investors expect corporations to adhere to in designing and administering executive and director compensation programs:

Maintain appropriate pay-for-performance alignment, with emphasis on long-term shareholder value: This principle encompasses overall executive pay practices, which must be designed to attract, retain, and appropriately motivate the key employees who drive shareholder value creation over the long term. It will take into consideration, among other factors, the link between pay and performance; the mix between fixed and variable pay; performance goals; and equity-based plan costs;

Avoid arrangements that risk “pay for failure”: This principle addresses the appropriateness of long or indefinite contracts, excessive severance packages, and guaranteed compensation;

Maintain an independent and effective compensation committee: This principle promotes oversight of executive pay programs by directors with appropriate skills, knowledge, experience, and a sound process for compensation decision-making (e.g., including access to independent expertise and advice when needed);

Provide shareholders with clear, comprehensive compensation disclosures: This principle underscores the importance of informative and timely disclosures that enable shareholders to evaluate executive pay practices fully and fairly; and

Avoid inappropriate pay to non-executive directors: This principle recognizes the interests of shareholders in ensuring that compensation to outside directors is reasonable and does not compromise their independence and ability to make appropriate judgments in overseeing managers’ pay and performance. At the market level, it may incorporate a variety of generally accepted best practices.

Advisory Votes on Executive Compensation—Management Proposals (Say-on-Pay)

General Recommendation: Vote case-by-case on ballot items related to executive pay and practices, as well as certain aspects of outside director compensation.

Vote against Advisory Votes on Executive Compensation (Say-on-Pay or “SOP”) if:

◾

There is an unmitigated misalignment between CEO pay and company performance ( pay for performance);

◾

The company maintains significant problematic pay practices; or

◾

The board exhibits a significant level of poor communication and responsiveness to shareholders.

Vote against or withhold from the members of the Compensation Committee and potentially the full board if:

◾

There is no SOP on the ballot, and an against vote on an SOP would otherwise be warranted due to pay-for-performance misalignment, problematic pay practices, or the lack of adequate responsiveness on compensation issues raised previously, or a combination thereof;

◾

The board fails to respond adequately to a previous SOP proposal that received less than 70 percent support of votes cast;

◾

The company has recently practiced or approved problematic pay practices, such as option repricing or option backdating; or

◾

The situation is egregious.


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Primary Evaluation Factors for Executive Pay

Pay-for-Performance Evaluation

ISS annually conducts a pay-for-performance analysis to identify strong or satisfactory alignment between pay and performance over a sustained period. With respect to companies in the S&P1500, Russell 3000, or Russell 3000E Indices¹⁷, this analysis considers the following:

Peer Group¹⁸ Alignment:

◾

The degree of alignment between the company’s annualized TSR rank and the CEO’s annualized total pay rank within a peer group, each measured over a three-year period.

◾

The rankings of CEO total pay and company financial performance within a peer group, each measured over a three-year period.

◾

The multiple of the CEO’s total pay relative to the peer group median in the most recent fiscal year.

Absolute Alignment¹⁹ – the absolute alignment between the trend in CEO pay and company TSR over the prior five fiscal years – i.e., the difference between the trend in annual pay changes and the trend in annualized TSR during the period.

If the above analysis demonstrates significant unsatisfactory long-term pay-for-performance alignment or, in the case of companies outside the Russell indices, a misalignment between pay and performance is otherwise suggested, our analysis may include any of the following qualitative factors, as relevant to an evaluation of how various pay elements may work to encourage or to undermine long-term value creation and alignment with shareholder interests:

◾

The ratio of performance- to time-based incentive awards;

◾

The overall ratio of performance-based compensation to fixed or discretionary pay;

◾

The rigor of performance goals;

◾

The complexity and risks around pay program design;

◾

The transparency and clarity of disclosure;

◾

The company’s peer group benchmarking practices;

◾

Financial/operational results, both absolute and relative to peers;

◾

Special circumstances related to, for example, a new CEO in the prior FY or anomalous equity grant practices (e.g., bi-annual awards);

◾

Realizable pay²⁰ compared to grant pay; and

◾

Any other factors deemed relevant.

¹⁷ The Russell 3000E Index includes approximately 4,000 of the largest U.S. equity securities.

¹⁸ The revised peer group is generally comprised of 14-24 companies that are selected using market cap, revenue (or assets for certain financial firms), GICS industry group, and company’s selected peers’ GICS industry group, with size constraints, via a process designed to select peers that are comparable to the subject company in terms of revenue/assets and industry, and also within a market-cap bucket that is reflective of the company’s market cap. For Oil, Gas & Consumable Fuels companies, market cap is the only size determinant.

¹⁹ Only Russell 3000 Index companies are subject to the Absolute Alignment analysis.

²⁰ ISS research reports include realizable pay for S&P1500 companies.


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Problematic Pay Practices

Problematic pay elements are generally evaluated case-by-case considering the context of a company’s overall pay program and demonstrated pay-for-performance philosophy. The focus is on executive compensation practices that contravene the global pay principles, including:

◾

Problematic practices related to non-performance-based compensation elements;

◾

Incentives that may motivate excessive risk-taking or present a windfall risk; and

◾

Pay decisions that circumvent pay-for-performance, such as options backdating or waiving performance requirements.

The list of examples below highlights certain problematic practices that carry significant weight in this overall consideration and may result in adverse vote recommendations:

◾

Repricing or replacing of underwater stock options/SARs without prior shareholder approval (including cash buyouts and voluntary surrender of underwater options);

◾

Extraordinary perquisites or tax gross-ups;

◾

New or materially amended agreements that provide for:

◾

Excessive termination or CIC severance payments (generally exceeding 3 times base salary and average/target/most recent bonus);

◾

CIC severance payments without involuntary job loss or substantial diminution of duties (“single” or “modified single” triggers) or in connection with a problematic Good Reason definition;

◾

CIC excise tax gross-up entitlements (including “modified” gross-ups); and/or

◾

Multi-year guaranteed awards that are not at risk due to rigorous performance conditions;

◾

Liberal CIC definition combined with any single-trigger CIC benefits;

◾

Insufficient executive compensation disclosure by externally-managed issuers (EMIs) such that a reasonable assessment of pay programs and practices applicable to the EMI’s executives is not possible;

◾

Severance payments made when the termination is not clearly disclosed as involuntary (for example, a termination without cause or resignation for good reason); and/or

◾

Any other provision or practice deemed to be egregious and present a significant risk to investors.

The above examples are not an exhaustive list. Please refer to ISS’ U.S. Compensation Policies FAQ document for additional detail on specific pay practices that have been identified as problematic and may lead to negative vote recommendations.

Options Backdating

The following factors should be examined case-by-case to allow for distinctions to be made between “sloppy” plan administration versus deliberate action or fraud:

◾

Reason and motive for the options backdating issue, such as inadvertent vs. deliberate grant date changes;

◾

Duration of options backdating;

◾

Size of restatement due to options backdating;

◾

Corrective actions taken by the board or compensation committee, such as canceling or re-pricing backdated options, the recouping of option gains on backdated grants; and

◾

Adoption of a grant policy that prohibits backdating and creates a fixed grant schedule or window period for equity grants in the future.


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Compensation Committee Communications and Responsiveness

Consider the following factors case-by-case when evaluating ballot items related to executive pay on the board’s responsiveness to investor input and engagement on compensation issues:

◾

Failure to respond to majority-supported shareholder proposals on executive pay topics; or

◾

Failure to adequately respond to the company’s previous say-on-pay proposal that received the support of less than 70 percent of votes cast, taking into account:

◾

Disclosure of the specific concerns voiced by dissenting shareholders that led to the say-on-pay opposition;

◾

Disclosure of specific and meaningful actions taken to address shareholders’ concerns;

◾

Other recent compensation actions taken by the company;

◾

Whether the issues raised are recurring or isolated;

◾

The company’s ownership structure; and

◾

Whether the support level was less than 50 percent, which would warrant the highest degree of responsiveness.

Frequency of Advisory Vote on Executive Compensation (“Say When on Pay”)

General Recommendation: Vote for annual advisory votes on compensation, which provide the most consistent and clear communication channel for shareholder concerns about companies’ executive pay programs.

Voting on Golden Parachutes in an Acquisition, Merger, Consolidation, or Proposed Sale

General Recommendation: Vote case-by-case on say on Golden Parachute proposals, including consideration of existing change-in-control arrangements maintained with named executive officers but also considering new or extended arrangements.

Features that may result in an “against” recommendation include one or more of the following, depending on the number, magnitude, and/or timing of issue(s):

◾

Single- or modified-single-trigger cash severance;

◾

Single-trigger acceleration of unvested equity awards;

◾

Full acceleration of equity awards granted shortly before the change in control;

◾

Acceleration of performance awards above the target level of performance without compelling rationale;

◾

Excessive cash severance (generally >3x base salary and bonus);

◾

Excise tax gross-ups triggered and payable;

◾

Excessive golden parachute payments (on an absolute basis or as a percentage of transaction equity value); or

◾

Recent amendments that incorporate any problematic features (such as those above) or recent actions (such as extraordinary equity grants) that may make packages so attractive as to influence merger agreements that may not be in the best interests of shareholders; or

◾

The company’s assertion that a proposed transaction is conditioned on shareholder approval of the golden parachute advisory vote.

Recent amendment(s) that incorporate problematic features will tend to carry more weight on the overall analysis. However, the presence of multiple legacy problematic features will also be closely scrutinized.


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In cases where the golden parachute vote is incorporated into a company’s advisory vote on compensation (management say-on-pay), ISS will evaluate the say-on-pay proposal in accordance with these guidelines, which may give higher weight to that component of the overall evaluation.

Equity-Based and Other Incentive Plans

Please refer to ISS’ U.S. Equity Compensation Plans FAQ document for additional details on the Equity Plan Scorecard policy.

General Recommendation: Vote case-by-case on certain equity-based compensation plans²¹ depending on a combination of certain plan features and equity grant practices, where positive factors may counterbalance negative factors, and vice versa, as evaluated using an “Equity Plan Scorecard” (EPSC) approach with three pillars:

◾

Plan Cost: The total estimated cost of the company’s equity plans relative to industry/market cap peers, measured by the company’s estimated Shareholder Value Transfer (SVT) in relation to peers and considering both:

◾

SVT based on new shares requested plus shares remaining for future grants, plus outstanding unvested/unexercised grants; and

◾

SVT based only on new shares requested plus shares remaining for future grants.

◾

Plan Features:

◾

Quality of disclosure around vesting upon a change in control (CIC);

◾

Discretionary vesting authority;

◾

Liberal share recycling on various award types;

◾

Lack of minimum vesting period for grants made under the plan; and

◾

Dividends payable prior to award vesting.

◾

Grant Practices:

◾

The company’s three-year burn rate relative to its industry/market cap peers;

◾

Vesting requirements in CEO’s recent equity grants (3-year look-back);

◾

The estimated duration of the plan (based on the sum of shares remaining available and the new shares requested, divided by the average annual shares granted in the prior three years);

◾

The proportion of the CEO’s most recent equity grants/awards subject to performance conditions;

◾

Whether the company maintains a sufficient claw-back policy; and

◾

Whether the company maintains sufficient post-exercise/vesting share-holding requirements.

Generally vote against the plan proposal if the combination of above factors indicates that the plan is not, overall, in shareholders’ interests, or if any of the following egregious factors (“overriding factors”) apply:

◾

Awards may vest in connection with a liberal change-of-control definition;

◾

The plan would permit repricing or cash buyout of underwater options without shareholder approval (either by expressly permitting it – for NYSE and Nasdaq listed companies – or by not prohibiting it when the company has a history of repricing – for non-listed companies);

◾

The plan is a vehicle for problematic pay practices or a significant pay-for-performance disconnect under certain circumstances;

◾

The plan is excessively dilutive to shareholders’ holdings;

◾

The plan contains an evergreen (automatic share replenishment) feature; or

◾

Any other plan features are determined to have a significant negative impact on shareholder interests.

²¹ Proposals evaluated under the EPSC policy generally include those to approve or amend (1) stock option plans for employees and/or employees and directors, (2) restricted stock plans for employees and/or employees and directors, and (3) omnibus stock incentive plans for employees and/or employees and directors; amended plans will be further evaluated case-by-case.


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Further Information on certain EPSC Factors:

Shareholder Value Transfer (SVT)

The cost of the equity plans is expressed as Shareholder Value Transfer (SVT), which is measured using a binomial option pricing model that assesses the amount of shareholders’ equity flowing out of the company to employees and directors. SVT is expressed as both a dollar amount and as a percentage of market value, and includes the new shares proposed, shares available under existing plans, and shares granted but unexercised (using two measures, in the case of plans subject to the Equity Plan Scorecard evaluation, as noted above). All award types are valued. For omnibus plans, unless limitations are placed on the most expensive types of awards (for example, full-value awards), the assumption is made that all awards to be granted will be the most expensive types.

For proposals that are not subject to the Equity Plan Scorecard evaluation, Shareholder Value Transfer is reasonable if it falls below a company-specific benchmark. The benchmark is determined as follows: The top quartile performers in each industry group (using the Global Industry Classification Standard: GICS) are identified. Benchmark SVT levels for each industry are established based on these top performers’ historic SVT. Regression analyses are run on each industry group to identify the variables most strongly correlated to SVT. The benchmark industry SVT level is then adjusted upwards or downwards for the specific company by plugging the company-specific performance measures, size, and cash compensation into the industry cap equations to arrive at the company’s benchmark.²²

Three-Year Value-Adjusted Burn Rate

A “Value-Adjusted Burn Rate” is used for stock plan evaluations. Value-Adjusted Burn Rate benchmarks are calculated as the greater of: (1) an industry-specific threshold based on three-year burn rates within the company’s GICS group segmented by S&P 500, Russell 3000 index (less the S&P 500) and non-Russell 3000 index; and (2) a de minimis threshold established separately for each of the S&P 500, the Russell 3000 index less the S&P 500, and the non-Russell 3000 index. Year-over-year burn-rate benchmark changes will be limited to a predetermined range above or below the prior year’s burn-rate benchmark.

The Value-Adjusted Burn Rate is calculated as follows:

Value-Adjusted Burn Rate = ((# of options * option’s dollar value using a Black-Scholes model) + (# of full-value awards * stock price)) / (Weighted average common shares * stock price).

Egregious Factors

Liberal Change in Control Definition

Generally vote against equity plans if the plan has a liberal definition of change in control and the equity awards could vest upon such liberal definition of change in control, even though an actual change in control may not occur. Examples of such a definition include, but are not limited to, announcement or commencement of a tender offer, provisions for acceleration upon a “potential” takeover, shareholder approval of a merger or other transactions, or similar language.

²² For plans evaluated under the Equity Plan Scorecard policy, the company’s SVT benchmark is considered along with other factors.


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Repricing Provisions

Vote against plans that expressly permit the repricing or exchange of underwater stock options/stock appreciate rights (SARs) without prior shareholder approval. “Repricing” typically includes the ability to do any of the following:

◾

Amend the terms of outstanding options or SARs to reduce the exercise price of such outstanding options or SARs;

◾

Cancel outstanding options or SARs in exchange for options or SARs with an exercise price that is less than the exercise price of the original options or SARs;

◾

Cancel underwater options in exchange for stock awards; or

◾

Provide cash buyouts of underwater options.

While the above cover most types of repricing, ISS may view other provisions as akin to repricing depending on the facts and circumstances.

Also, vote against or withhold from members of the Compensation Committee who approved repricing (as defined above or otherwise determined by ISS), without prior shareholder approval, even if such repricings are allowed in their equity plan.

Vote against plans that do not expressly prohibit repricing or cash buyout of underwater options without shareholder approval if the company has a history of repricing/buyouts without shareholder approval, and the applicable listing standards would not preclude them from doing so.

Problematic Pay Practices or Significant Pay-for-Performance Disconnect

If the equity plan on the ballot is a vehicle for problematic pay practices, vote against the plan.

ISS may recommend a vote against the equity plan if the plan is determined to be a vehicle for pay-for-performance misalignment. Considerations in voting against the equity plan may include, but are not limited to:

◾

Severity of the pay-for-performance misalignment;

◾

Whether problematic equity grant practices are driving the misalignment; and/or

◾

Whether equity plan awards have been heavily concentrated to the CEO and/or the other NEOs.

Amending Cash and Equity Plans (including Approval for Tax Deductibility (162(m))

General Recommendation: Vote case-by-case on amendments to cash and equity incentive plans.

Generally vote for proposals to amend executive cash, stock, or cash and stock incentive plans if the proposal:

◾

Addresses administrative features only; or

◾

Seeks approval for Section 162(m) purposes only, and the plan administering committee consists entirely of independent directors, per ISS’ Classification of Directors. Note that if the company is presenting the plan to shareholders for the first time for any reason (including after the company’s initial public offering), or if the proposal is bundled with other material plan amendments, then the recommendation will be case-by-case (see below).

Vote against proposals to amend executive cash, stock, or cash and stock incentive plans if the proposal:

◾

Seeks approval for Section 162(m) purposes only, and the plan administering committee does not consist entirely of independent directors, per ISS’ Classification of Directors.


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Vote case-by-case on all other proposals to amend cash incentive plans. This includes plans presented to shareholders for the first time after the company’s IPO and/or proposals that bundle material amendment(s) other than those for Section 162(m) purposes.

Vote case-by-case on all other proposals to amend equity incentive plans, considering the following:

◾

If the proposal requests additional shares and/or the amendments include a term extension or addition of full value awards as an award type, the recommendation will be based on the Equity Plan Scorecard evaluation as well as an analysis of the overall impact of the amendments;

◾

If the plan is being presented to shareholders for the first time (including after the company’s IPO), whether or not additional shares are being requested, the recommendation will be based on the Equity Plan Scorecard evaluation as well as an analysis of the overall impact of any amendments; and

◾

If there is no request for additional shares and the amendments do not include a term extension or addition of full value awards as an award type, then the recommendation will be based entirely on an analysis of the overall impact of the amendments, and the EPSC evaluation will be shown only for informational purposes.

In the first two case-by-case evaluation scenarios, the EPSC evaluation/score is the more heavily weighted consideration.

Specific Treatment of Certain Award Types in Equity Plan Evaluations

Dividend Equivalent Rights

Options that have Dividend Equivalent Rights (DERs) associated with them will have a higher calculated award value than those without DERs under the binomial model, based on the value of these dividend streams. The higher value will be applied to new shares, shares available under existing plans, and shares awarded but not exercised per the plan specifications. DERS transfer more shareholder equity to employees and non-employee directors and this cost should be captured.

Operating Partnership (OP) Units in Equity Plan Analysis of Real Estate Investment Trusts (REITs)

For Real Estate Investment Trusts (REITS), include the common shares issuable upon conversion of outstanding Operating Partnership (OP) units in the share count for the purposes of determining: (1) market capitalization in the Shareholder Value Transfer (SVT) analysis and (2) shares outstanding in the burn rate analysis.

Other Compensation Plans

401(k) Employee Benefit Plans

General Recommendation: Vote for proposals to implement a 401(k) savings plan for employees.

Employee Stock Ownership Plans (ESOPs)

General Recommendation: Vote for proposals to implement an ESOP or increase authorized shares for existing ESOPs, unless the number of shares allocated to the ESOP is excessive (more than five percent of outstanding shares).


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Employee Stock Purchase Plans—Qualified Plans

General Recommendation: Vote case-by-case on qualified employee stock purchase plans. Vote for employee stock purchase plans where all of the following apply:

◾

Purchase price is at least 85 percent of fair market value;

◾

Offering period is 27 months or less; and

◾

The number of shares allocated to the plan is 10 percent or less of the outstanding shares.

Vote against qualified employee stock purchase plans where when the plan features do not meet all of the above criteria.

Employee Stock Purchase Plans—Non-Qualified Plans

General Recommendation: Vote case-by-case on nonqualified employee stock purchase plans. Vote for nonqualified employee stock purchase plans with all the following features:

◾

Broad-based participation;

◾

Limits on employee contribution, which may be a fixed dollar amount or expressed as a percent of base salary;

◾

Company matching contribution up to 25 percent of employee’s contribution, which is effectively a discount of 20 percent from market value; and

◾

No discount on the stock price on the date of purchase when there is a company matching contribution.

Vote against nonqualified employee stock purchase plans when the plan features do not meet all of the above criteria. If the matching contribution or effective discount exceeds the above, ISS may evaluate the SVT cost of the plan as part of the assessment.

Option Exchange Programs/Repricing Options

General Recommendation: Vote case-by-case on management proposals seeking approval to exchange/reprice options taking into consideration:

◾

Historic trading patterns--the stock price should not be so volatile that the options are likely to be back “in-the-money” over the near term;

◾

Rationale for the re-pricing--was the stock price decline beyond management’s control?;

◾

Is this a value-for-value exchange?;

◾

Are surrendered stock options added back to the plan reserve?;

◾

Timing—repricing should occur at least one year out from any precipitous drop in company’s stock price;

◾

Option vesting—does the new option vest immediately or is there a black-out period?;

◾

Term of the option--the term should remain the same as that of the replaced option;

◾

Exercise price—should be set at fair market or a premium to market; and

◾

Participants—executive officers and directors must be excluded.

If the surrendered options are added back to the equity plans for re-issuance, then also take into consideration the company’s total cost of equity plans and its three-year average burn rate.

In addition to the above considerations, evaluate the intent, rationale, and timing of the repricing proposal. The proposal should clearly articulate why the board is choosing to conduct an exchange program at this point in time. Repricing underwater options after a recent precipitous drop in the company’s stock price demonstrates poor timing


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and warrants additional scrutiny. Also, consider the terms of the surrendered options, such as the grant date, exercise price and vesting schedule. Grant dates of surrendered options should be far enough back (two to three years) so as not to suggest that repricings are being done to take advantage of short-term downward price movements. Similarly, the exercise price of surrendered options should be above the 52-week high for the stock price.

Vote for shareholder proposals to put option repricings to a shareholder vote.

Stock Plans in Lieu of Cash

General Recommendation: Vote case-by-case on plans that provide participants with the option of taking all or a portion of their cash compensation in the form of stock.

Vote for non-employee director-only equity plans that provide a dollar-for-dollar cash-for-stock exchange.

Vote case-by-case on plans which do not provide a dollar-for-dollar cash for stock exchange. In cases where the exchange is not dollar-for-dollar, the request for new or additional shares for such equity program will be considered using the binomial option pricing model. In an effort to capture the total cost of total compensation, ISS will not make any adjustments to carve out the in-lieu-of cash compensation.

Transfer Stock Option (TSO) Programs

General Recommendation: One-time Transfers: Vote against or withhold from compensation committee members if they fail to submit one-time transfers to shareholders for approval.

Vote case-by-case on one-time transfers. Vote for if:

◾

Executive officers and non-employee directors are excluded from participating;

◾

Stock options are purchased by third-party financial institutions at a discount to their fair value using option pricing models such as Black-Scholes or a Binomial Option Valuation or other appropriate financial models; and

◾

There is a two-year minimum holding period for sale proceeds (cash or stock) for all participants.

Additionally, management should provide a clear explanation of why options are being transferred to a third-party institution and whether the events leading up to a decline in stock price were beyond management’s control. A review of the company’s historic stock price volatility should indicate if the options are likely to be back “in-the-money” over the near term.

Ongoing TSO program: Vote against equity plan proposals if the details of ongoing TSO programs are not provided to shareholders. Since TSOs will be one of the award types under a stock plan, the ongoing TSO program, structure, and mechanics must be disclosed to shareholders. The specific criteria to be considered in evaluating these proposals include, but not limited, to the following:

◾

Eligibility;

◾

Vesting;

◾

Bid-price;

◾

Term of options;

◾

Cost of the program and impact of the TSOs on company’s total option expense; and

◾

Option repricing policy.


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Amendments to existing plans that allow for introduction of transferability of stock options should make clear that only options granted post-amendment shall be transferable.

Director Compensation

Shareholder Ratification of Director Pay Programs

General Recommendation: Vote case-by-case on management proposals seeking ratification of non-employee director compensation, based on the following factors:

◾

If the equity plan under which non-employee director grants are made is on the ballot, whether or not it warrants support; and

◾

An assessment of the following qualitative factors:

◾

The relative magnitude of director compensation as compared to companies of a similar profile;

◾

The presence of problematic pay practices relating to director compensation;

◾

Director stock ownership guidelines and holding requirements;

◾

Equity award vesting schedules;

◾

The mix of cash and equity-based compensation;

◾

Meaningful limits on director compensation;

◾

The availability of retirement benefits or perquisites; and

◾

The quality of disclosure surrounding director compensation.

Equity Plans for Non-Employee Directors

General Recommendation: Vote case-by-case on compensation plans for non-employee directors, based on:

◾

The total estimated cost of the company’s equity plans relative to industry/market cap peers, measured by the company’s estimated Shareholder Value Transfer (SVT) based on new shares requested plus shares remaining for future grants, plus outstanding unvested/unexercised grants;

◾

The company’s three-year burn rate relative to its industry/market cap peers (in certain circumstances); and

◾

The presence of any egregious plan features (such as an option repricing provision or liberal CIC vesting risk).

On occasion, non-employee director stock plans will exceed the plan cost or burn-rate benchmarks when combined with employee or executive stock plans. In such cases, vote case-by-case on the plan taking into consideration the following qualitative factors:

◾

The relative magnitude of director compensation as compared to companies of a similar profile;

◾

The presence of problematic pay practices relating to director compensation;

◾

Director stock ownership guidelines and holding requirements;

◾

Equity award vesting schedules;

◾

The mix of cash and equity-based compensation;

◾

Meaningful limits on director compensation;

◾

The availability of retirement benefits or perquisites; and

◾

The quality of disclosure surrounding director compensation.

Non-Employee Director Retirement Plans

General Recommendation: Vote against retirement plans for non-employee directors. Vote for shareholder proposals to eliminate retirement plans for non-employee directors.


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Shareholder Proposals on Compensation

Bonus Banking/Bonus Banking “Plus”

General Recommendation: Vote case-by-case on proposals seeking deferral of a portion of annual bonus pay, with ultimate payout linked to sustained results for the performance metrics on which the bonus was earned (whether for the named executive officers or a wider group of employees), taking into account the following factors:

◾

The company’s past practices regarding equity and cash compensation;

◾

Whether the company has a holding period or stock ownership requirements in place, such as a meaningful retention ratio (at least 50 percent for full tenure); and

◾

Whether the company has a rigorous claw-back policy in place.

Compensation Consultants—Disclosure of Board or Company’s Utilization

General Recommendation: Generally vote for shareholder proposals seeking disclosure regarding the company, board, or compensation committee’s use of compensation consultants, such as company name, business relationship(s), and fees paid.

Disclosure/Setting Levels or Types of Compensation for Executives and Directors

General Recommendation: Generally vote for shareholder proposals seeking additional disclosure of executive and director pay information, provided the information requested is relevant to shareholders’ needs, would not put the company at a competitive disadvantage relative to its industry, and is not unduly burdensome to the company.

Generally vote against shareholder proposals seeking to set absolute levels on compensation or otherwise dictate the amount or form of compensation (such as types of compensation elements or specific metrics) to be used for executive or directors.

Generally vote against shareholder proposals that mandate a minimum amount of stock that directors must own in order to qualify as a director or to remain on the board.

Vote case-by-case on all other shareholder proposals regarding executive and director pay, taking into account relevant factors, including but not limited to: company performance, pay level and design versus peers, history of compensation concerns or pay-for-performance disconnect, and/or the scope and prescriptive nature of the proposal.

Golden Coffins/Executive Death Benefits

General Recommendation: Generally vote for proposals calling for companies to adopt a policy of obtaining shareholder approval for any future agreements and corporate policies that could oblige the company to make payments or awards following the death of a senior executive in the form of unearned salary or bonuses, accelerated vesting or the continuation in force of unvested equity grants, perquisites and other payments or awards made in lieu of compensation. This would not apply to any benefit programs or equity plan proposals for which the broad-based employee population is eligible.

Hold Equity Past Retirement or for a Significant Period of Time

General Recommendation: Vote case-by-case on shareholder proposals asking companies to adopt policies requiring senior executive officers to retain a portion of net shares acquired through compensation plans. The following factors will be taken into account:

◾

The percentage/ratio of net shares required to be retained;


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The time period required to retain the shares;

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Whether the company has equity retention, holding period, and/or stock ownership requirements in place and the robustness of such requirements;

◾

Whether the company has any other policies aimed at mitigating risk taking by executives;

◾

Executives’ actual stock ownership and the degree to which it meets or exceeds the proponent’s suggested holding period/retention ratio or the company’s existing requirements; and

◾

Problematic pay practices, current and past, which may demonstrate a short-term versus long-term focus.

Pay Disparity

General Recommendation: Vote case-by-case on proposals calling for an analysis of the pay disparity between corporate executives and other non-executive employees. The following factors will be considered:

◾

The company’s current level of disclosure of its executive compensation setting process, including how the company considers pay disparity;

◾

If any problematic pay practices or pay-for-performance concerns have been identified at the company; and

◾

The level of shareholder support for the company’s pay programs.

Generally vote against proposals calling for the company to use the pay disparity analysis or pay ratio in a specific way to set or limit executive pay.

Pay for Performance/Performance-Based Awards

General Recommendation: Vote case-by-case on shareholder proposals requesting that a significant amount of future long-term incentive compensation awarded to senior executives shall be performance-based and requesting that the board adopt and disclose challenging performance metrics to shareholders, based on the following analytical steps:

◾

First, vote for shareholder proposals advocating the use of performance-based equity awards, such as performance contingent options or restricted stock, indexed options, or premium-priced options, unless the proposal is overly restrictive or if the company has demonstrated that it is using a “substantial” portion of performance-based awards for its top executives. Standard stock options and performance-accelerated awards do not meet the criteria to be considered as performance-based awards. Further, premium-priced options should have a meaningful premium to be considered performance-based awards; and

◾

Second, assess the rigor of the company’s performance-based equity program. If the bar set for the performance-based program is too low based on the company’s historical or peer group comparison, generally vote for the proposal. Furthermore, if target performance results in an above target payout, vote for the shareholder proposal due to program’s poor design. If the company does not disclose the performance metric of the performance-based equity program, vote for the shareholder proposal regardless of the outcome of the first step to the test.

In general, vote for the shareholder proposal if the company does not meet both of the above two steps.

Pay for Superior Performance

General Recommendation: Vote case-by-case on shareholder proposals that request the board establish a pay-for-superior performance standard in the company’s executive compensation plan for senior executives. These proposals generally include the following principles:

◾

Set compensation targets for the plan’s annual and long-term incentive pay components at or below the peer group median;


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Deliver a majority of the plan’s target long-term compensation through performance-vested, not simply time-vested, equity awards;

◾

Provide the strategic rationale and relative weightings of the financial and non-financial performance metrics or criteria used in the annual and performance-vested long-term incentive components of the plan;

◾

Establish performance targets for each plan financial metric relative to the performance of the company’s peer companies; and

◾

Limit payment under the annual and performance-vested long-term incentive components of the plan to when the company’s performance on its selected financial performance metrics exceeds peer group median performance.

Consider the following factors in evaluating this proposal:

◾

What aspects of the company’s annual and long-term equity incentive programs are performance driven?

◾

If the annual and long-term equity incentive programs are performance driven, are the performance criteria and hurdle rates disclosed to shareholders or are they benchmarked against a disclosed peer group?

◾

Can shareholders assess the correlation between pay and performance based on the current disclosure? and

◾

What type of industry and stage of business cycle does the company belong to?

Pre-Arranged Trading Plans (10b5-1 Plans)

General Recommendation: Generally vote for shareholder proposals calling for the addition of certain safeguards in prearranged trading plans (10b5-1 plans) for executives. Safeguards may include:

◾

Adoption, amendment, or termination of a 10b5-1 Plan must be disclosed in a Form 8-K;

◾

Amendment or early termination of a 10b5-1 Plan allowed only under extraordinary circumstances, as determined by the board;

◾

Request that a certain number of days that must elapse between adoption or amendment of a 10b5-1 Plan and initial trading under the plan;

◾

Reports on Form 4 must identify transactions made pursuant to a 10b5-1 Plan;

◾

An executive may not trade in company stock outside the 10b5-1 Plan; and

◾

Trades under a 10b5-1 Plan must be handled by a broker who does not handle other securities transactions for the executive.

Prohibit Outside CEOs from Serving on Compensation Committees

General Recommendation: Generally vote against proposals seeking a policy to prohibit any outside CEO from serving on a company’s compensation committee, unless the company has demonstrated problematic pay practices that raise concerns about the performance and composition of the committee.

Recoupment of Incentive or Stock Compensation in Specified Circumstances

General Recommendation: Vote case-by-case on proposals to recoup incentive cash or stock compensation made to senior executives if it is later determined that the figures upon which incentive compensation is earned turn out to have been in error, or if the senior executive has breached company policy or has engaged in misconduct that may be significantly detrimental to the company’s financial position or reputation, or if the senior executive failed to manage or monitor risks that subsequently led to significant financial or reputational harm to the company. Many companies have adopted policies that permit recoupment in cases where an executive’s fraud, misconduct, or negligence significantly contributed to a restatement of financial results that led to the awarding of unearned incentive compensation. However, such policies may be narrow given that not all misconduct or negligence may result in significant financial restatements. Misconduct, negligence, or lack of sufficient oversight by senior executives may lead to significant financial loss or reputational damage that may have long-lasting impact.


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In considering whether to support such shareholder proposals, ISS will take into consideration the following factors:

◾

If the company has adopted a formal recoupment policy;

◾

The rigor of the recoupment policy focusing on how and under what circumstances the company may recoup incentive or stock compensation;

◾

Whether the company has chronic restatement history or material financial problems;

◾

Whether the company’s policy substantially addresses the concerns raised by the proponent;

◾

Disclosure of recoupment of incentive or stock compensation from senior executives or lack thereof; and

◾

Any other relevant factors.

Severance and Golden Parachute Agreements

General Recommendation: Vote case-by-case on shareholder proposals requiring that executive severance (including change-in-control related) arrangements or payments be submitted for shareholder ratification.

Factors that will be considered include, but are not limited to:

◾

The company’s severance or change-in-control agreements in place, and the presence of problematic features (such as excessive severance entitlements, single triggers, excise tax gross-ups, etc.);

◾

Any existing limits on cash severance payouts or policies which require shareholder ratification of severance payments exceeding a certain level;

◾

Any recent severance-related controversies; and

◾

Whether the proposal is overly prescriptive, such as requiring shareholder approval of severance that does not exceed market norms.

Share Buyback Impact on Incentive Program Metrics

General Recommendation: Vote case-by-case on proposals requesting the company exclude the impact of share buybacks from the calculation of incentive program metrics, considering the following factors:

◾

The frequency and timing of the company’s share buybacks;

◾

The use of per-share metrics in incentive plans;

◾

The effect of recent buybacks on incentive metric results and payouts; and

◾

Whether there is any indication of metric result manipulation.

Supplemental Executive Retirement Plans (SERPs)

General Recommendation: Generally vote for shareholder proposals requesting to put extraordinary benefits contained in SERP agreements to a shareholder vote unless the company’s executive pension plans do not contain excessive benefits beyond what is offered under employee-wide plans.

Generally vote for shareholder proposals requesting to limit the executive benefits provided under the company’s supplemental executive retirement plan (SERP) by limiting covered compensation to a senior executive’s annual salary or those pay elements covered for the general employee population.

Tax Gross-Up Proposals

General Recommendation: Generally vote for proposals calling for companies to adopt a policy of not providing tax gross-up payments to executives, except in situations where gross-ups are provided pursuant to a plan, policy, or arrangement applicable to management employees of the company, such as a relocation or expatriate tax equalization policy.


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Termination of Employment Prior to Severance Payment/Eliminating Accelerated Vesting of Unvested Equity

General Recommendation: Vote case-by-case on shareholder proposals seeking a policy requiring termination of employment prior to severance payment and/or eliminating accelerated vesting of unvested equity.

The following factors will be considered:

◾

The company’s current treatment of equity upon employment termination and/or in change-in-control situations (i.e., vesting is double triggered and/or pro rata, does it allow for the assumption of equity by acquiring company, the treatment of performance shares, etc.); and

◾

Current employment agreements, including potential poor pay practices such as gross-ups embedded in those agreements.

Generally vote for proposals seeking a policy that prohibits automatic acceleration of the vesting of equity awards to senior executives upon a voluntary termination of employment or in the event of a change in control (except for pro rata vesting considering the time elapsed and attainment of any related performance goals between the award date and the change in control).


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6. Routine/Miscellaneous

Adjourn Meeting

General Recommendation: Generally vote against proposals to provide management with the authority to adjourn an annual or special meeting absent compelling reasons to support the proposal.

Vote for proposals that relate specifically to soliciting votes for a merger or transaction if supporting that merger or transaction. Vote against proposals if the wording is too vague or if the proposal includes “other business.”

Amend Quorum Requirements

General Recommendation: Vote case-by-case on proposals to reduce quorum requirements for shareholder meetings below a majority of the shares outstanding, taking into consideration:

◾

The new quorum threshold requested;

◾

The rationale presented for the reduction;

◾

The market capitalization of the company (size, inclusion in indices);

◾

The company’s ownership structure;

◾

Previous voter turnout or attempts to achieve quorum;

◾

Any provisions or commitments to restore quorum to a majority of shares outstanding, should voter turnout improve sufficiently; and

◾

Other factors as appropriate.

In general, a quorum threshold kept as close to a majority of shares outstanding as is achievable is preferred.

Vote case-by-case on directors who unilaterally lower the quorum requirements below a majority of the shares outstanding, taking into consideration the factors listed above.

Amend Minor Bylaws

General Recommendation: Vote for bylaw or charter changes that are of a housekeeping nature (updates or corrections).

Change Company Name

General Recommendation: Vote for proposals to change the corporate name unless there is compelling evidence that the change would adversely impact shareholder value.


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Change Date, Time, or Location of Annual Meeting

General Recommendation: Vote for management proposals to change the date, time, or location of the annual meeting unless the proposed change is unreasonable.

Vote against shareholder proposals to change the date, time, or location of the annual meeting unless the current scheduling or location is unreasonable.

Other Business

General Recommendation: Vote against proposals to approve other business when it appears as a voting item.


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7. Social and Environmental Issues

Global Approach – E&S Shareholder Proposals

ISS applies a common approach globally to evaluating social and environmental proposals which cover a wide range of topics, including consumer and product safety, environment and energy, labor standards and human rights, workplace and board diversity, and corporate political issues. While a variety of factors goes into each analysis, the overall principle guiding all vote recommendations focuses on how the proposal may enhance or protect shareholder value in either the short or long term.

General Recommendation: Generally vote case-by-case, examining primarily whether implementation of the proposal is likely to enhance or protect shareholder value. The following factors will be considered:

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If the issues presented in the proposal are being appropriately or effectively dealt with through legislation or government regulation;

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If the company has already responded in an appropriate and sufficient manner to the issue(s) raised in the proposal;

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Whether the proposal’s request is unduly burdensome (scope or timeframe) or overly prescriptive;

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The company’s approach compared with any industry standard practices for addressing the issue(s) raised by the proposal;

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Whether there are significant controversies, fines, penalties, or litigation associated with the company’s practices related to the issue(s) raised in the proposal;

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If the proposal requests increased disclosure or greater transparency, whether reasonable and sufficient information is currently available to shareholders from the company or from other publicly available sources; and

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If the proposal requests increased disclosure or greater transparency, whether implementation would reveal proprietary or confidential information that could place the company at a competitive disadvantage.

Endorsement of Principles

General Recommendation: Generally vote against proposals seeking a company’s endorsement of principles that support a particular public policy position. Endorsing a set of principles may require a company to take a stand on an issue that is beyond its own control and may limit its flexibility with respect to future developments.

Management and the board should be afforded the flexibility to make decisions on specific public policy positions based on their own assessment of the most beneficial strategies for the company.

Animal Welfare

Animal Welfare Policies

General Recommendation: Generally vote for proposals seeking a report on a company’s animal welfare standards, or animal welfare-related risks, unless:

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The company has already published a set of animal welfare standards and monitors compliance;

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The company’s standards are comparable to industry peers; and

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There are no recent significant fines, litigation, or controversies related to the company’s and/or its suppliers’ treatment of animals.


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Animal Testing

General Recommendation: Generally vote against proposals to phase out the use of animals in product testing, unless:

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The company is conducting animal testing programs that are unnecessary or not required by regulation;

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The company is conducting animal testing when suitable alternatives are commonly accepted and used by industry peers; or

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There are recent, significant fines or litigation related to the company’s treatment of animals.

Animal Slaughter

General Recommendation: Generally vote against proposals requesting the implementation of Controlled Atmosphere Killing (CAK) methods at company and/or supplier operations unless such methods are required by legislation or generally accepted as the industry standard.

Vote case-by-case on proposals requesting a report on the feasibility of implementing CAK methods at company and/or supplier operations considering the availability of existing research conducted by the company or industry groups on this topic and any fines or litigation related to current animal processing procedures at the company.

Consumer Issues

Genetically Modified Ingredients

General Recommendation: Generally vote against proposals requesting that a company voluntarily label genetically engineered (GE) ingredients in its products. The labeling of products with GE ingredients is best left to the appropriate regulatory authorities.

Vote case-by-case on proposals asking for a report on the feasibility of labeling products containing GE ingredients, taking into account:

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The potential impact of such labeling on the company’s business;

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The quality of the company’s disclosure on GE product labeling, related voluntary initiatives, and how this disclosure compares with industry peer disclosure; and

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Company’s current disclosure on the feasibility of GE product labeling.

Generally vote against proposals seeking a report on the social, health, and environmental effects of genetically modified organisms (GMOs). Studies of this sort are better undertaken by regulators and the scientific community.

Generally vote against proposals to eliminate GE ingredients from the company’s products, or proposals asking for reports outlining the steps necessary to eliminate GE ingredients from the company’s products. Such decisions are more appropriately made by management with consideration of current regulations.


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Reports on Potentially Controversial Business/Financial Practices

General Recommendation: Vote case-by-case on requests for reports on a company’s potentially controversial business or financial practices or products, taking into account:

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Whether the company has adequately disclosed mechanisms in place to prevent abuses;

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Whether the company has adequately disclosed the financial risks of the products/practices in question;

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Whether the company has been subject to violations of related laws or serious controversies; and

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Peer companies’ policies/practices in this area.

Pharmaceutical Pricing, Access to Medicines, and Prescription Drug Reimportation

General Recommendation: Generally vote against proposals requesting that companies implement specific price restraints on pharmaceutical products unless the company fails to adhere to legislative guidelines or industry norms in its product pricing practices.

Vote case-by-case on proposals requesting that a company report on its product pricing or access to medicine policies, considering:

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The potential for reputational, market, and regulatory risk exposure;

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Existing disclosure of relevant policies;

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Deviation from established industry norms;

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Relevant company initiatives to provide research and/or products to disadvantaged consumers;

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Whether the proposal focuses on specific products or geographic regions;

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The potential burden and scope of the requested report; and

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Recent significant controversies, litigation, or fines at the company.

Generally vote for proposals requesting that a company report on the financial and legal impact of its prescription drug reimportation policies unless such information is already publicly disclosed.

Generally vote against proposals requesting that companies adopt specific policies to encourage or constrain prescription drug reimportation. Such matters are more appropriately the province of legislative activity and may place the company at a competitive disadvantage relative to its peers.

Product Safety and Toxic/Hazardous Materials

General Recommendation: Generally vote for proposals requesting that a company report on its policies, initiatives/procedures, and oversight mechanisms related to toxic/hazardous materials or product safety in its supply chain, unless:

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The company already discloses similar information through existing reports such as a supplier code of conduct and/or a sustainability report;

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The company has formally committed to the implementation of a toxic/hazardous materials and/or product safety and supply chain reporting and monitoring program based on industry norms or similar standards within a specified time frame; or

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The company has not been recently involved in relevant significant controversies, fines, or litigation.


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Vote case-by-case on resolutions requesting that companies develop a feasibility assessment to phase-out of certain toxic/hazardous materials, or evaluate and disclose the potential financial and legal risks associated with utilizing certain materials, considering:

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The company’s current level of disclosure regarding its product safety policies, initiatives, and oversight mechanisms;

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Current regulations in the markets in which the company operates; and

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Recent significant controversies, litigation, or fines stemming from toxic/hazardous materials at the company.

Generally vote against resolutions requiring that a company reformulate its products.

Tobacco-Related Proposals

General Recommendation: Vote case-by-case on resolutions regarding the advertisement of tobacco products, considering:

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Recent related fines, controversies, or significant litigation;

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Whether the company complies with relevant laws and regulations on the marketing of tobacco;

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Whether the company’s advertising restrictions deviate from those of industry peers;

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Whether the company entered into the Master Settlement Agreement, which restricts marketing of tobacco to youth; and

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Whether restrictions on marketing to youth extend to foreign countries.

Vote case-by-case on proposals regarding second-hand smoke, considering;

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Whether the company complies with all laws and regulations;

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The degree that voluntary restrictions beyond those mandated by law might hurt the company’s competitiveness; and

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The risk of any health-related liabilities.

Generally vote against resolutions to cease production of tobacco-related products, to avoid selling products to tobacco companies, to spin-off tobacco-related businesses, or prohibit investment in tobacco equities. Such business decisions are better left to company management or portfolio managers.

Generally vote against proposals regarding tobacco product warnings. Such decisions are better left to public health authorities.

Climate Change

Say on Climate (SoC) Management Proposals

General Recommendation: Vote case-by-case on management proposals that request shareholders to approve the company’s climate transition action plan²³, taking into account the completeness and rigor of the plan. Information that will be considered where available includes the following:

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The extent to which the company’s climate related disclosures are in line with TCFD recommendations and meet other market standards;

²³ Variations of this request also include climate transition related ambitions, or commitment to reporting on the implementation of a climate plan.


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Disclosure of its operational and supply chain GHG emissions (Scopes 1, 2, and 3);

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The completeness and rigor of company’s short-, medium-, and long-term targets for reducing operational and supply chain GHG emissions (Scopes 1, 2, and 3 if relevant);

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Whether the company has sought and received third-party approval that its targets are science-based;

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Whether the company has made a commitment to be “net zero” for operational and supply chain emissions (Scopes 1, 2, and 3) by 2050;

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Whether the company discloses a commitment to report on the implementation of its plan in subsequent years;

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Whether the company’s climate data has received third-party assurance;

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Disclosure of how the company’s lobbying activities and its capital expenditures align with company strategy;

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Whether there are specific industry decarbonization challenges; and

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The company’s related commitment, disclosure, and performance compared to its industry peers.

Say on Climate (SoC) Shareholder Proposals

General Recommendation: Vote case-by-case on shareholder proposals that request the company to disclose a report providing its GHG emissions levels and reduction targets and/or its upcoming/approved climate transition action plan and provide shareholders the opportunity to express approval or disapproval of its GHG emissions reduction plan, taking into account information such as the following:

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The completeness and rigor of the company’s climate-related disclosure;

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The company’s actual GHG emissions performance;

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Whether the company has been the subject of recent, significant violations, fines, litigation, or controversy related to its GHG emissions; and

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Whether the proposal’s request is unduly burdensome (scope or timeframe) or overly prescriptive.

Climate Change/Greenhouse Gas (GHG) Emissions

General Recommendation: Generally vote for resolutions requesting that a company disclose information on the financial, physical, or regulatory risks it faces related to climate change on its operations and investments or on how the company identifies, measures, and manages such risks, considering:

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Whether the company already provides current, publicly-available information on the impact that climate change may have on the company as well as associated company policies and procedures to address related risks and/or opportunities;

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The company’s level of disclosure compared to industry peers; and

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Whether there are significant controversies, fines, penalties, or litigation associated with the company’s climate change-related performance.

Generally vote for proposals requesting a report on greenhouse gas (GHG) emissions from company operations and/or products and operations, unless:

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The company already discloses current, publicly-available information on the impacts that GHG emissions may have on the company as well as associated company policies and procedures to address related risks and/or opportunities;

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The company’s level of disclosure is comparable to that of industry peers; or

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There are no significant, controversies, fines, penalties, or litigation associated with the company’s GHG emissions.


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Vote case-by-case on proposals that call for the adoption of GHG reduction goals from products and operations, taking into account:

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Whether the company provides disclosure of year-over-year GHG emissions performance data;

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Whether company disclosure lags behind industry peers;

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The company’s actual GHG emissions performance;

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The company’s current GHG emission policies, oversight mechanisms, and related initiatives; and

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Whether the company has been the subject of recent, significant violations, fines, litigation, or controversy related to GHG emissions.

Energy Efficiency

General Recommendation: Generally vote for proposals requesting that a company report on its energy efficiency policies, unless:

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The company complies with applicable energy efficiency regulations and laws, and discloses its participation in energy efficiency policies and programs, including disclosure of benchmark data, targets, and performance measures; or

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The proponent requests adoption of specific energy efficiency goals within specific timelines.

Renewable Energy

General Recommendation: Generally vote for requests for reports on the feasibility of developing renewable energy resources unless the report would be duplicative of existing disclosure or irrelevant to the company’s line of business.

Generally vote against proposals requesting that the company invest in renewable energy resources. Such decisions are best left to management’s evaluation of the feasibility and financial impact that such programs may have on the company.

Generally vote against proposals that call for the adoption of renewable energy goals, taking into account:

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The scope and structure of the proposal;

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The company’s current level of disclosure on renewable energy use and GHG emissions; and

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The company’s disclosure of policies, practices, and oversight implemented to manage GHG emissions and mitigate climate change risks.

Diversity

Board Diversity

General Recommendation: Generally vote for requests for reports on a company’s efforts to diversify the board, unless:

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The gender and racial minority representation of the company’s board is reasonably inclusive in relation to companies of similar size and business; or

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The board already reports on its nominating procedures and gender and racial minority initiatives on the board and within the company.


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Vote case-by-case on proposals asking a company to increase the gender and racial minority representation on its board, taking into account:

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The degree of existing gender and racial minority diversity on the company’s board and among its executive officers;

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The level of gender and racial minority representation that exists at the company’s industry peers;

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The company’s established process for addressing gender and racial minority board representation;

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Whether the proposal includes an overly prescriptive request to amend nominating committee charter language;

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The independence of the company’s nominating committee;

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Whether the company uses an outside search firm to identify potential director nominees; and

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Whether the company has had recent controversies, fines, or litigation regarding equal employment practices.

Equality of Opportunity

General Recommendation: Generally vote for proposals requesting a company disclose its diversity policies or initiatives, or proposals requesting disclosure of a company’s comprehensive workforce diversity data, including requests for EEO-1 data, unless:

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The company publicly discloses equal opportunity policies and initiatives in a comprehensive manner;

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The company already publicly discloses comprehensive workforce diversity data; or

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The company has no recent significant EEO-related violations or litigation.

Generally vote against proposals seeking information on the diversity efforts of suppliers and service providers. Such requests may pose a significant burden on the company.

Gender Identity, Sexual Orientation, and Domestic Partner Benefits

General Recommendation: Generally vote for proposals seeking to amend a company’s EEO statement or diversity policies to prohibit discrimination based on sexual orientation and/or gender identity, unless the change would be unduly burdensome.

Generally vote against proposals to extend company benefits to, or eliminate benefits from, domestic partners. Decisions regarding benefits should be left to the discretion of the company.

Gender, Race/Ethnicity Pay Gap

General Recommendation: Vote case-by-case on requests for reports on a company’s pay data by gender or race/ ethnicity, or a report on a company’s policies and goals to reduce any gender or race/ethnicity pay gaps, taking into account:

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The company’s current policies and disclosure related to both its diversity and inclusion policies and practices and its compensation philosophy on fair and equitable compensation practices;

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Whether the company has been the subject of recent controversy, litigation, or regulatory actions related to gender, race, or ethnicity pay gap issues;

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The company’s disclosure regarding gender, race, or ethnicity pay gap policies or initiatives compared to its industry peers; and

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Local laws regarding categorization of race and/or ethnicity and definitions of ethnic and/or racial minorities.


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Racial Equity and/or Civil Rights Audit Guidelines

General Recommendation: Vote case-by-case on proposals asking a company to conduct an independent racial equity and/or civil rights audit, taking into account:

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The company’s established process or framework for addressing racial inequity and discrimination internally;

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Whether the company adequately discloses workforce diversity and inclusion metrics and goals;

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Whether the company has issued a public statement related to its racial justice efforts in recent years, or has committed to internal policy review;

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Whether the company has engaged with impacted communities, stakeholders, and civil rights experts;

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The company’s track record in recent years of racial justice measures and outreach externally; and

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Whether the company has been the subject of recent controversy, litigation, or regulatory actions related to racial inequity or discrimination.

Environment and Sustainability

Facility and Workplace Safety

General Recommendation: Vote case-by-case on requests for workplace safety reports, including reports on accident risk reduction efforts, taking into account:

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The company’s current level of disclosure of its workplace health and safety performance data, health and safety management policies, initiatives, and oversight mechanisms;

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The nature of the company’s business, specifically regarding company and employee exposure to health and safety risks;

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Recent significant controversies, fines, or violations related to workplace health and safety; and

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The company’s workplace health and safety performance relative to industry peers.

Vote case-by-case on resolutions requesting that a company report on safety and/or security risks associated with its operations and/or facilities, considering:

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The company’s compliance with applicable regulations and guidelines;

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The company’s current level of disclosure regarding its security and safety policies, procedures, and compliance monitoring; and

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The existence of recent, significant violations, fines, or controversy regarding the safety and security of the company’s operations and/or facilities.

Natural Capital- Related and/or Community Impact Assessment Proposals

General Recommendation: Vote case-by-case on requests for reports on policies and/or the potential (community) social and/or environmental impact of company operations, considering:

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Alignment of current disclosure of applicable company policies, metrics, risk assessment report(s) and risk management procedures with any relevant, broadly accepted reporting frameworks;

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The impact of regulatory non-compliance, litigation, remediation, or reputational loss that may be associated with failure to manage the company’s operations in question, including the management of relevant community and stakeholder relations;

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The nature, purpose, and scope of the company’s operations in the specific region(s);


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The degree to which company policies and procedures are consistent with industry norms; and

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The scope of the resolution.

Hydraulic Fracturing

General Recommendation: Generally vote for proposals requesting greater disclosure of a company’s (natural gas) hydraulic fracturing operations, including measures the company has taken to manage and mitigate the potential community and environmental impacts of those operations, considering:

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The company’s current level of disclosure of relevant policies and oversight mechanisms;

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The company’s current level of such disclosure relative to its industry peers;

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Potential relevant local, state, or national regulatory developments; and

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Controversies, fines, or litigation related to the company’s hydraulic fracturing operations.

Operations in Protected Areas

General Recommendation: Generally vote for requests for reports on potential environmental damage as a result of company operations in protected regions, unless:

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Operations in the specified regions are not permitted by current laws or regulations;

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The company does not currently have operations or plans to develop operations in these protected regions; or

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The company’s disclosure of its operations and environmental policies in these regions is comparable to industry peers.

Recycling

General Recommendation: Vote case-by-case on proposals to report on an existing recycling program, or adopt a new recycling program, taking into account:

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The nature of the company’s business;

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The current level of disclosure of the company’s existing related programs;

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The timetable and methods of program implementation prescribed by the proposal;

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The company’s ability to address the issues raised in the proposal; and

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How the company’s recycling programs compare to similar programs of its industry peers.

Sustainability Reporting

General Recommendation: Generally vote for proposals requesting that a company report on its policies, initiatives, and oversight mechanisms related to social, economic, and environmental sustainability, unless:

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The company already discloses similar information through existing reports or policies such as an environment, health, and safety (EHS) report; a comprehensive code of corporate conduct; and/or a diversity report; or

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The company has formally committed to the implementation of a reporting program based on Global Reporting Initiative (GRI) guidelines or a similar standard within a specified time frame.

Water Issues

General Recommendation: Vote case-by-case on proposals requesting a company report on, or adopt a new policy on, water-related risks and concerns, taking into account:

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The company’s current disclosure of relevant policies, initiatives, oversight mechanisms, and water usage metrics;


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Whether or not the company’s existing water-related policies and practices are consistent with relevant internationally recognized standards and national/local regulations;

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The potential financial impact or risk to the company associated with water-related concerns or issues; and

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Recent, significant company controversies, fines, or litigation regarding water use by the company and its suppliers.

General Corporate Issues

Charitable Contributions

General Recommendation: Vote against proposals restricting a company from making charitable contributions. Charitable contributions are generally useful for assisting worthwhile causes and for creating goodwill in the community. In the absence of bad faith, self-dealing, or gross negligence, management should determine which, and if, contributions are in the best interests of the company.

Data Security, Privacy, and Internet Issues

General Recommendation: Vote case-by-case on proposals requesting the disclosure or implementation of data security, privacy, or information access and management policies and procedures, considering:

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The level of disclosure of company policies and procedures relating to data security, privacy, freedom of speech, information access and management, and Internet censorship;

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Engagement in dialogue with governments or relevant groups with respect to data security, privacy, or the free flow of information on the Internet;

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The scope of business involvement and of investment in countries whose governments censor or monitor the Internet and other telecommunications;

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Applicable market-specific laws or regulations that may be imposed on the company; and

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Controversies, fines, or litigation related to data security, privacy, freedom of speech, or Internet censorship.

ESG Compensation-Related Proposals

General Recommendation: Vote case-by-case on proposals seeking a report or additional disclosure on the company’s approach, policies, and practices on incorporating environmental and social criteria into its executive compensation strategy, considering:

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The scope and prescriptive nature of the proposal;

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The company’s current level of disclosure regarding its environmental and social performance and governance;

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The degree to which the board or compensation committee already discloses information on whether it has considered related E&S criteria; and

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Whether the company has significant controversies or regulatory violations regarding social or environmental issues.


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Human Rights, Human Capital Management, and International Operations

Human Rights Proposals

General Recommendation: Generally vote for proposals requesting a report on company or company supplier labor and/or human rights standards and policies unless such information is already publicly disclosed.

Vote case-by-case on proposals to implement company or company supplier labor and/or human rights standards and policies, considering:

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The degree to which existing relevant policies and practices are disclosed;

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Whether or not existing relevant policies are consistent with internationally recognized standards;

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Whether company facilities and those of its suppliers are monitored and how;

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Company participation in fair labor organizations or other internationally recognized human rights initiatives;

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Scope and nature of business conducted in markets known to have higher risk of workplace labor/human rights abuse;

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Recent, significant company controversies, fines, or litigation regarding human rights at the company or its suppliers;

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The scope of the request; and

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Deviation from industry sector peer company standards and practices.

Vote case-by-case on proposals requesting that a company conduct an assessment of the human rights risks in its operations or in its supply chain, or report on its human rights risk assessment process, considering:

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The degree to which existing relevant policies and practices are disclosed, including information on the implementation of these policies and any related oversight mechanisms;

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The company’s industry and whether the company or its suppliers operate in countries or areas where there is a history of human rights concerns;

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Recent significant controversies, fines, or litigation regarding human rights involving the company or its suppliers, and whether the company has taken remedial steps; and

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Whether the proposal is unduly burdensome or overly prescriptive.

Mandatory Arbitration

General Recommendation: Vote case-by-case on requests for a report on a company’s use of mandatory arbitration on employment-related claims, taking into account:

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The company’s current policies and practices related to the use of mandatory arbitration agreements on workplace claims;

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Whether the company has been the subject of recent controversy, litigation, or regulatory actions related to the use of mandatory arbitration agreements on workplace claims; and

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The company’s disclosure of its policies and practices related to the use of mandatory arbitration agreements compared to its peers.

Operations in High-Risk Markets

General Recommendation: Vote case-by-case on requests for a report on a company’s potential financial and reputational risks associated with operations in “high-risk” markets, such as a terrorism-sponsoring state or politically/socially unstable region, taking into account:


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The nature, purpose, and scope of the operations and business involved that could be affected by social or political disruption;

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Current disclosure of applicable risk assessment(s) and risk management procedures;

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Compliance with U.S. sanctions and laws;

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Consideration of other international policies, standards, and laws; and

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Whether the company has been recently involved in recent, significant controversies, fines, or litigation related to its operations in “high-risk” markets.

Outsourcing/Offshoring

General Recommendation: Vote case-by-case on proposals calling for companies to report on the risks associated with outsourcing/plant closures, considering:

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Controversies surrounding operations in the relevant market(s);

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The value of the requested report to shareholders;

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The company’s current level of disclosure of relevant information on outsourcing and plant closure procedures; and

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The company’s existing human rights standards relative to industry peers.

Sexual Harassment

General Recommendation: Vote case-by-case on requests for a report on company actions taken to strengthen policies and oversight to prevent workplace sexual harassment, or a report on risks posed by a company’s failure to prevent workplace sexual harassment, taking into account:

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The company’s current policies, practices, oversight mechanisms related to preventing workplace sexual harassment;

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Whether the company has been the subject of recent controversy, litigation, or regulatory actions related to workplace sexual harassment issues; and

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The company’s disclosure regarding workplace sexual harassment policies or initiatives compared to its industry peers.

Weapons and Military Sales

General Recommendation: Vote against reports on foreign military sales or offsets. Such disclosures may involve sensitive and confidential information. Moreover, companies must comply with government controls and reporting on foreign military sales.

Generally vote against proposals asking a company to cease production or report on the risks associated with the use of depleted uranium munitions or nuclear weapons components and delivery systems, including disengaging from current and proposed contracts. Such contracts are monitored by government agencies, serve multiple military and non-military uses, and withdrawal from these contracts could have a negative impact on the company’s business.


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Political Activities

Lobbying

General Recommendation: Vote case-by-case on proposals requesting information on a company’s lobbying (including direct, indirect, and grassroots lobbying) activities, policies, or procedures, considering:

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The company’s current disclosure of relevant lobbying policies, and management and board oversight;

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The company’s disclosure regarding trade associations or other groups that it supports, or is a member of, that engage in lobbying activities; and

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Recent significant controversies, fines, or litigation regarding the company’s lobbying-related activities.

Political Contributions

General Recommendation: Generally vote for proposals requesting greater disclosure of a company’s political contributions and trade association spending policies and activities, considering:

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The company’s policies, and management and board oversight related to its direct political contributions and payments to trade associations or other groups that may be used for political purposes;

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The company’s disclosure regarding its support of, and participation in, trade associations or other groups that may make political contributions; and

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Recent significant controversies, fines, or litigation related to the company’s political contributions or political activities.

Vote against proposals barring a company from making political contributions. Businesses are affected by legislation at the federal, state, and local level; barring political contributions can put the company at a competitive disadvantage.

Vote against proposals to publish in newspapers and other media a company’s political contributions. Such publications could present significant cost to the company without providing commensurate value to shareholders.

Political Expenditures and Lobbying Congruency

General Recommendation: Generally vote case-by-case on proposals requesting greater disclosure of a company’s alignment of political contributions, lobbying, and electioneering spending with a company’s publicly stated values and policies, considering:

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The company’s policies, management, board oversight, governance processes, and level of disclosure related to direct political contributions, lobbying activities, and payments to trade associations, political action committees, or other groups that may be used for political purposes;

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The company’s disclosure regarding: the reasons for its support of candidates for public offices; the reasons for support of and participation in trade associations or other groups that may make political contributions; and other political activities;

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Any incongruencies identified between a company’s direct and indirect political expenditures and its publicly stated values and priorities; and

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Recent significant controversies related to the company’s direct and indirect lobbying, political contributions, or political activities.


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Generally vote case-by-case on proposals requesting comparison of a company’s political spending to objectives that can mitigate material risks for the company, such as limiting global warming.

Political Ties

General Recommendation: Generally vote against proposals asking a company to affirm political nonpartisanship in the workplace, so long as:

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There are no recent, significant controversies, fines, or litigation regarding the company’s political contributions or trade association spending; and

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The company has procedures in place to ensure that employee contributions to company-sponsored political action committees (PACs) are strictly voluntary and prohibit coercion.

Vote against proposals asking for a list of company executives, directors, consultants, legal counsels, lobbyists, or investment bankers that have prior government service and whether such service had a bearing on the business of the company. Such a list would be burdensome to prepare without providing any meaningful information to shareholders.


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8. Mutual Fund Proxies

Election of Directors

General Recommendation: Vote case-by-case on the election of directors and trustees, following the same guidelines for uncontested directors for public company shareholder meetings. However, mutual fund boards do not usually have compensation committees, so do not withhold for the lack of this committee.

Closed End Funds- Unilateral Opt-In to Control Share Acquisition Statutes

General Recommendation: For closed-end management investment companies (CEFs), vote against or withhold from nominating/governance committee members (or other directors on a case-by-case basis) at CEFs that have not provided a compelling rationale for opting-in to a Control Share Acquisition statute, nor submitted a by-law amendment to a shareholder vote.

Converting Closed-end Fund to Open-end Fund

General Recommendation: Vote case-by-case on conversion proposals, considering the following factors:

◾

Past performance as a closed-end fund;

◾

Market in which the fund invests;

◾

Measures taken by the board to address the discount; and

◾

Past shareholder activism, board activity, and votes on related proposals.

Proxy Contests

General Recommendation: Vote case-by-case on proxy contests, considering the following factors:

◾

Past performance relative to its peers;

◾

Market in which the fund invests;

◾

Measures taken by the board to address the issues;

◾

Past shareholder activism, board activity, and votes on related proposals;

◾

Strategy of the incumbents versus the dissidents;

◾

Independence of directors;

◾

Experience and skills of director candidates;

◾

Governance profile of the company; and

◾

Evidence of management entrenchment.

Investment Advisory Agreements

General Recommendation: Vote case-by-case on investment advisory agreements, considering the following factors:

◾

Proposed and current fee schedules;

◾

Fund category/investment objective;

◾

Performance benchmarks;

◾

Share price performance as compared with peers;

◾

Resulting fees relative to peers; and

◾

Assignments (where the advisor undergoes a change of control).


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Approving New Classes or Series of Shares

General Recommendation: Vote for the establishment of new classes or series of shares.

Preferred Stock Proposals

General Recommendation: Vote case-by-case on the authorization for or increase in preferred shares, considering the following factors:

◾

Stated specific financing purpose;

◾

Possible dilution for common shares; and

◾

Whether the shares can be used for antitakeover purposes.

1940 Act Policies

General Recommendation: Vote case-by-case on policies under the Investment Advisor Act of 1940, considering the following factors:

◾

Potential competitiveness;

◾

Regulatory developments;

◾

Current and potential returns; and

◾

Current and potential risk.

Generally vote for these amendments as long as the proposed changes do not fundamentally alter the investment focus of the fund and do comply with the current SEC interpretation.

Changing a Fundamental Restriction to a Nonfundamental Restriction

General Recommendation: Vote case-by-case on proposals to change a fundamental restriction to a non-fundamental restriction, considering the following factors:

◾

The fund’s target investments;

◾

The reasons given by the fund for the change; and

◾

The projected impact of the change on the portfolio.

Change Fundamental Investment Objective to Nonfundamental

General Recommendation: Vote against proposals to change a fund’s fundamental investment objective to non-fundamental.

Name Change Proposals

General Recommendation: Vote case-by-case on name change proposals, considering the following factors:

◾

Political/economic changes in the target market;

◾

Consolidation in the target market; and

◾

Current asset composition.


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Change in Fund’s Subclassification

General Recommendation: Vote case-by-case on changes in a fund’s sub-classification, considering the following factors:

◾

Potential competitiveness;

◾

Current and potential returns;

◾

Risk of concentration; and

◾

Consolidation in target industry.

Business Development Companies—Authorization to Sell Shares of Common Stock at a Price below Net Asset Value

General Recommendation: Vote for proposals authorizing the board to issue shares below Net Asset Value (NAV) if:

◾

The proposal to allow share issuances below NAV has an expiration date no more than one year from the date shareholders approve the underlying proposal, as required under the Investment Company Act of 1940;

◾

The sale is deemed to be in the best interests of shareholders by (1) a majority of the company’s independent directors and (2) a majority of the company’s directors who have no financial interest in the issuance; and

◾

The company has demonstrated responsible past use of share issuances by either:

◾

Outperforming peers in its 8-digit GICS group as measured by one- and three-year median TSRs; or

◾

Providing disclosure that its past share issuances were priced at levels that resulted in only small or moderate discounts to NAV and economic dilution to existing non-participating shareholders.

Disposition of Assets/Termination/Liquidation

General Recommendation: Vote case-by-case on proposals to dispose of assets, to terminate or liquidate, considering the following factors:

◾

Strategies employed to salvage the company;

◾

The fund’s past performance; and

◾

The terms of the liquidation.

Changes to the Charter Document

General Recommendation: Vote case-by-case on changes to the charter document, considering the following factors:

◾

The degree of change implied by the proposal;

◾

The efficiencies that could result;

◾

The state of incorporation; and

◾

Regulatory standards and implications.

Vote against any of the following changes:

◾

Removal of shareholder approval requirement to reorganize or terminate the trust or any of its series;

◾

Removal of shareholder approval requirement for amendments to the new declaration of trust;

◾

Removal of shareholder approval requirement to amend the fund’s management contract, allowing the contract to be modified by the investment manager and the trust management, as permitted by the 1940 Act;


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◾

Allow the trustees to impose other fees in addition to sales charges on investment in a fund, such as deferred sales charges and redemption fees that may be imposed upon redemption of a fund’s shares;

◾

Removal of shareholder approval requirement to engage in and terminate subadvisory arrangements; or

◾

Removal of shareholder approval requirement to change the domicile of the fund.

Changing the Domicile of a Fund

General Recommendation: Vote case-by-case on re-incorporations, considering the following factors:

◾

Regulations of both states;

◾

Required fundamental policies of both states; and

◾

The increased flexibility available.

Authorizing the Board to Hire and Terminate Subadvisers Without Shareholder Approval

General Recommendation: Vote against proposals authorizing the board to hire or terminate subadvisers without shareholder approval if the investment adviser currently employs only one subadviser.

Distribution Agreements

General Recommendation: Vote case-by-case on distribution agreement proposals, considering the following factors:

◾

Fees charged to comparably sized funds with similar objectives;

◾

The proposed distributor’s reputation and past performance;

◾

The competitiveness of the fund in the industry; and

◾

The terms of the agreement.

Master-Feeder Structure

General Recommendation: Vote for the establishment of a master-feeder structure.

Mergers

General Recommendation: Vote case-by-case on merger proposals, considering the following factors:

◾

Resulting fee structure;

◾

Performance of both funds;

◾

Continuity of management personnel; and

◾

Changes in corporate governance and their impact on shareholder rights.

Shareholder Proposals for Mutual Funds

Establish Director Ownership Requirement

General Recommendation: Generally vote against shareholder proposals that mandate a specific minimum amount of stock that directors must own in order to qualify as a director or to remain on the board.


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Reimburse Shareholder for Expenses Incurred

General Recommendation: Vote case-by-case on shareholder proposals to reimburse proxy solicitation expenses. When supporting the dissidents, vote for the reimbursement of the proxy solicitation expenses.

Terminate the Investment Advisor

General Recommendation: Vote case-by-case on proposals to terminate the investment advisor, considering the following factors:

◾

Performance of the fund’s Net Asset Value (NAV);

◾

The fund’s history of shareholder relations; and

◾

The performance of other funds under the advisor’s management.


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We empower investors and companies to build for long-term and sustainable growth by providing

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G E T S T A R T E D W I T H I S S S O L U T I O N S

Email sales@issgovernance.com or visit www.issgovernance.com for more information.

Founded in 1985, Institutional Shareholder Services group of companies (ISS) empowers investors and companies to build for long-term and sustainable growth by providing high-quality data, analytics and insight. ISS, which is majority owned by Deutsche Bourse Group, along with Genstar Capital and ISS management, is a leading provider of corporate governance and responsible investment solutions, market intelligence, fund services, and events and editorial content for institutional investors and corporations, globally. ISS’ 2,600 employees operate worldwide across 29 global locations in 15 countries. Its approximately 3,400 clients include many of the world’s leading institutional investors who rely on ISS’ objective and impartial offerings, as well as public companies focused on ESG and governance risk mitigation as a shareholder value enhancing measure. Clients rely on ISS’ expertise to help them make informed investment decisions. This document and all of the information contained in it, including without limitation all text, data, graphs, and charts (collectively, the “Information”) is the property of Institutional Shareholder Services Inc. (ISS), its subsidiaries, or, in some cases third party suppliers.

The Information has not been submitted to, nor received approval from, the United States Securities and Exchange Commission or any other regulatory body. None of the Information constitutes an offer to sell (or a solicitation of an offer to buy), or a promotion or recommendation of, any security, financial product or other investment vehicle or any trading strategy, and ISS does not endorse, approve, or otherwise express any opinion regarding any issuer, securities, financial products or instruments or trading strategies.

The user of the Information assumes the entire risk of any use it may make or permit to be made of the Information.

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STATE STREET INSTITUTIONAL INVESTMENT TRUST
(the “Trust”)
One Iron Street
Boston, Massachusetts 02210

STATEMENT OF ADDITIONAL INFORMATION

April 30, 2025

Fund	TICKER
STATE STREET AGGREGATE BOND INDEX FUND
Class A	SSFCX
Class I	SSFDX
Class K	SSFEX
STATE STREET BALANCED INDEX FUND
Class K	SSBIX
STATE STREET EMERGING MARKETS EQUITY INDEX FUND
Class K	SSKEX
STATE STREET EQUITY 500 INDEX FUND
Administrative Shares	STFAX
Class R Shares	SSFRX
Service Shares	STBIX
Class A	SSSVX
Class I	SSSWX
Class K	SSSYX
STATE STREET GLOBAL ALL CAP EQUITY EX-U.S. INDEX FUND
Class A	SSGHX
Class I	SSGJX
Class K	SSGLX
STATE STREET HEDGED INTERNATIONAL DEVELOPED EQUITY INDEX FUND
Class K	SSHQX
STATE STREET INTERNATIONAL DEVELOPED EQUITY INDEX FUND
Class K	SSIWX
STATE STREET SMALL/MID CAP EQUITY INDEX FUND
Class A	SSMJX
Class I	SSMLX
Class K	SSMKX
STATE STREET TARGET RETIREMENT 2025 FUND
Class I	SSBRX
Class K	SSBSX
Class R3	SSAHX
STATE STREET TARGET RETIREMENT 2030 FUND
Class I	SSBWX
Class K	SSBYX
Class R3	SSAJX
STATE STREET TARGET RETIREMENT 2035 FUND
Class I	SSCJX
Class K	SSCKX
Class R3	SSAZX
STATE STREET TARGET RETIREMENT 2040 FUND
Class I	SSCNX
Class K	SSCQX
Class R3	SSAKX
STATE STREET TARGET RETIREMENT 2045 FUND
Class I	SSDDX
Class K	SSDEX

Fund	TICKER
Class R3	SSAOX
STATE STREET TARGET RETIREMENT 2050 FUND
Class I	SSDJX
Class K	SSDLX
Class R3	SSAUX
STATE STREET TARGET RETIREMENT 2055 FUND
Class I	SSDOX
Class K	SSDQX
Class R3	SSAWX
STATE STREET TARGET RETIREMENT 2060 FUND
Class I	SSDWX
Class K	SSDYX
Class R3	SSAYX
STATE STREET TARGET RETIREMENT 2065 FUND
Class I	SSFJX
Class K	SSFKX
Class R3	SSFPX
STATE STREET TARGET RETIREMENT 2070 FUND
Class I	SSGQX
Class K	SSGNX
Class R3	SSGUX
STATE STREET TARGET RETIREMENT FUND
Class I	SSFNX
Class K	SSFOX
Class R3	SSFQX

This Statement of Additional Information (“SAI”) relates to the prospectuses dated April 30, 2025, as may be revised and/or supplemented from time to time thereafter for each of the Funds listed above (each, a “Prospectus” and collectively, the “Prospectuses”).

The SAI is not a prospectus and should be read in conjunction with the Prospectuses. A copy of each Prospectus can be obtained free of charge by calling (800) 647-7327 or by written request to the Trust at the address listed above.

Each Portfolio's audited financial statements for the fiscal year ended December 31, 2024, including the independent registered public accounting firm reports thereon, are included in the Portfolio's Form N-CSR for the fiscal year ended December 31, 2024 and are incorporated into this SAI by reference. Copies of each Portfolio's annual report, semi-annual reports and other information such as each Portfolio's financial statements are available, without charge, upon request, by calling (800) 647-7327 or by written request to the Trust at the address above.

TABLE OF CONTENTS

General	4
Description of the Funds and Their Investments and Risks	5
Additional Investments and Risks	6
Management of the Trust and State Street Master Funds	33
Proxy Voting Procedures	41
Control Persons and Principal Holders of Securities	42
Investment Advisory and Other Services	56
Portfolio Managers	66
Brokerage Allocation and Other Practices	67
Declaration of Trust, Capital Stock and Other Information	70
Pricing of Shares	71
Taxation of the Funds	71
Underwriter	83
Financial Statements	84
Appendix A—Ratings of Debt Instruments	A-1
Appendix B—Trust's Proxy Voting Policy and Procedures	B-1
Appendix C - Adviser's Proxy Voting Procedures and Guidelines	C-1

General

The Trust was organized as a business trust under the laws of The Commonwealth of Massachusetts on February 16, 2000.

The Trust is an open-end management investment company. The Trust includes the following diversified series:

•State Street Aggregate Bond Index Fund (the “Aggregate Bond Index Fund”);

•State Street Aggregate Bond Index Portfolio (the “Aggregate Bond Index Portfolio”);

•State Street Balanced Index Fund;

•State Street Emerging Markets Equity Index Fund (the “Emerging Markets Equity Index Fund”);

•State Street Equity 500 Index Fund (the “Equity 500 Index Fund”);

•State Street Equity 500 Index II Portfolio (the “Equity 500 Index II Portfolio”);

•State Street Federal Government Money Market Fund;

•State Street Federal Treasury Money Market Fund;

•State Street Federal Treasury Plus Money Market Fund;

•State Street Global All Cap Equity ex-U.S. Index Fund (the “Global All Cap Equity ex-U.S. Index Fund”);

•State Street Global All Cap Equity ex-U.S. Index Portfolio (the “Global All Cap Equity ex-U.S. Index Portfolio”);

•State Street Hedged International Developed Equity Index Fund (the “Hedged International Developed Equity Index Fund”);

•State Street Income Fund;

•State Street International Developed Equity Index Fund (the “International Developed Equity Index Fund”);

•State Street Institutional Liquid Reserves Government Money Market Fund;

•State Street Institutional Treasury Money Market Fund;

•State Street Institutional Treasury Plus Money Market Fund;

•State Street Institutional U.S. Government Money Market Fund;

•State Street Small/Mid Cap Equity Index Fund (the “Small/Mid Cap Equity Index Fund”);

•State Street Small/Mid Cap Equity Index Portfolio (the “Small/Mid Cap Equity Index Portfolio”);

•State Street Target Retirement Fund (the “Retirement Fund”);

•State Street Target Retirement 2025 Fund (the “Target Retirement 2025 Fund”);

•State Street Target Retirement 2030 Fund (the “Target Retirement 2030 Fund”);

•State Street Target Retirement 2035 Fund (the “Target Retirement 2035 Fund”);

•State Street Target Retirement 2040 Fund (the “Target Retirement 2040 Fund”);

•State Street Target Retirement 2045 Fund (the “Target Retirement 2045 Fund”);

•State Street Target Retirement 2050 Fund (the “Target Retirement 2050 Fund”);

•State Street Target Retirement 2055 Fund (the “Target Retirement 2055 Fund”);

•State Street Target Retirement 2060 Fund (the “Target Retirement 2060 Fund”);

•State Street Target Retirement 2065 Fund (the “Target Retirement 2065 Fund”);

•State Street Target Retirement 2070 Fund (the “Target Retirement 2070 Fund”);

•State Street Treasury Obligations Money Market Fund;

•State Street U.S. Core Equity Fund.

Fund, the Target Retirement 2045 Fund, the Target Retirement 2050 Fund, the Target Retirement 2055 Fund, the Target Retirement 2060 Fund, the Target Retirement 2065 Fund and the Target Retirement 2070 Fund are referred to in this SAI as the “Funds,” and each Fund may be referred to in context as the “Fund.”

The Aggregate Bond Index Fund, the Balanced Index Fund, the Emerging Markets Equity Index Fund, the Equity 500 Index Fund, the Global All Cap Equity ex-U.S. Index Fund, the Hedged International Developed Equity Index Fund, the International Developed Equity Index Fund and the Small/Mid Cap Equity Index Fund are referred to in this SAI as the “Index Funds.” The Retirement Fund, Target Retirement 2025 Fund, Target Retirement 2030 Fund, Target Retirement 2035 Fund, Target Retirement 2040 Fund, Target Retirement 2045 Fund, Target Retirement 2050 Fund, Target Retirement 2055 Fund, Target Retirement 2060 Fund, Target Retirement 2065 Fund and the Target Retirement 2070 Fund are referred to collectively in this SAI as the “Target Retirement Funds.”

Each Fund listed below as a feeder fund (each a “Feeder Fund” and collectively the “Feeder Funds”) seeks to achieve its investment objective by investing substantially all of its investable assets in a corresponding master portfolio in the Trust or, as indicated below, the State Street Master Funds that has substantially similar investment strategies to those of the Feeder Fund. The table below shows the respective Portfolio in which each Feeder Fund invests. All Portfolios together are referred to in this SAI as the “Portfolios” and each Portfolio may be referred to in context as the “Portfolio” as appropriate.

Feeder Fund	Master Portfolio
Aggregate Bond Index Fund	Aggregate Bond Index Portfolio
Equity 500 Index Fund	Equity 500 Index II Portfolio
Global All Cap Equity ex-U.S. Index Fund	Global All Cap Equity ex-U.S. Index Portfolio
International Developed Equity Index Fund	State Street International Developed Equity Index Portfolio (“International Developed Equity Index Portfolio”)*
Small/Mid Cap Equity Index Fund	Small/Mid Cap Equity Index Portfolio

This Portfolio is in the State Street Master Funds.

The Hedged International Developed Equity Index Fund seeks to gain its investment exposure to the constituents of the MSCI EAFE (Europe, Australasia, Far East) 100% Hedged to USD Index by investing in the International Developed Equity Index Portfolio. In managing its portfolio of investments, the Portfolio may purchase various securities and investment related instruments and make use of various investment techniques, including, but not limited to, those described below.

Description of the Funds and Their Investments and Risks

In addition to the principal investment strategies and the principal risks of the Funds described in each Fund's Prospectus, a Fund may employ other investment practices and may be subject to additional risks, which are described below. In reviewing these practices of the Feeder Funds, you should assume that the practices of the corresponding Portfolio are the same in all material respects.

Each Target Retirement Fund seeks to achieve its investment objective by investing in a combination of domestic and international mutual funds and exchange-traded funds sponsored by SSGA Funds Management, Inc. (the “Adviser” or “SSGA FM”) or its affiliates (“Underlying Funds”) using an asset allocation strategy. In managing their portfolios of investments, the Underlying Funds may purchase various securities and investment related instruments and make use of various investment techniques, including, but not limited to, those described below. Except as otherwise stated, references in this section to “the Funds,” “each Fund,” or “a Fund” may, as applicable, refer to the Funds, one or more Underlying Funds, or more than one of the foregoing.

Additional Information Concerning the MSCI All Country World Index ex USA Investable Market Index (the “MSCI ACWI ex USA IMI Index” or sometimes referred to in context as the “Index”)

The Global All Cap Equity ex-U.S. Index Fund is not sponsored, endorsed, sold or promoted by Morgan Stanley Capital International Inc. (“MSCI”). MSCI makes no representation or warranty, express or implied, to the owners of shares of the Global All Cap Equity ex-U.S. Index Fund or any member of the public regarding the advisability of investing in securities generally or in the Global All Cap Equity ex-U.S. Index Fund particularly or the ability of the MSCI Index to track general performance. MSCI's only relationship to the Global All Cap Equity ex-U.S. Index Fund is the licensing of certain trademarks and trade names of MSCI and of the MSCI Index, which is determined, composed and calculated by MSCI without regard to the Global All Cap Equity ex-U.S. Index Fund. MSCI has no obligation to take the needs of the Global All Cap Equity ex-U.S. Index Fund or the owners of shares of the Global All Cap Equity ex-U.S. Index Fund into consideration in determining, composing or calculating the MSCI Index. MSCI is not responsible for and has not participated in the determination of the price and number of shares of the Global All Cap Equity ex-U.S. Index Fund or the timing of the issuance or sale of shares of Global All Cap Equity ex-U.S. Index Fund, or calculation of the equation by which shares of the Global All Cap Equity ex-U.S. Index Fund are redeemable for cash. MSCI has no obligation or liability in connection with the administration, marketing or trading of shares of the Global All Cap Equity ex-U.S. Index Fund.

MSCI does not guarantee the accuracy or the completeness of the MSCI Index or any data included therein and MSCI shall have no liability for any errors, omissions or interruptions therein. MSCI makes no warranty, express or implied, as to results to be obtained by the Global All Cap Equity ex-U.S. Index Fund, owners of shares of the Global All Cap Equity ex-U.S. Index Fund or any other person or entity from the use of the MSCI Index or any data included therein. MSCI makes no express or implied warranties, and expressly disclaims all warranties of merchantability or fitness for a particular purpose or use with respect to the MSCI Index or any data included therein. Without limiting any of the foregoing, in no event shall MSCI have any liability for any special, punitive, indirect or consequential damages (including lost profits), even if notified of the possibility of such damages.

Additional Investments and Risks

Bonds

The Funds may invest a portion of their assets in bonds. A bond is an interest-bearing security issued by a company, governmental unit or, in some cases, a non-U.S. entity. The issuer of a bond has a contractual obligation to pay interest at a stated rate on specific dates and to repay principal (the bond's face value) periodically or on a specified maturity date; provided, however, a zero-coupon bond pays no interest to its holder during its life. The value of a zero-coupon bond to a Fund consists of the difference between such bond's face value at the time of maturity and the price for which it was acquired, which may be an amount significantly less than its face value (sometimes referred to as a “deep discount” price).

An issuer may have the right to redeem or “call” a bond before maturity, in which case the investor may have to reinvest the proceeds at lower market rates. Most bonds bear interest income at a “coupon” rate that is fixed for the life of the bond. The value of a fixed rate bond usually rises when market interest rates fall, and falls when market interest rates rise. Accordingly, a fixed rate bond's yield (income as a percent of the bond's current value) may differ from its coupon rate as its value rises or falls. Fixed rate bonds generally are also subject to inflation risk, which is the risk that the value of the bond or income from the bond will be worth less in the future as inflation decreases the value of money. This could mean that, as inflation increases, the “real” value of the assets of a Fund holding fixed rate bonds can decline, as can the value of the Fund's distributions. Other types of bonds bear income at an interest rate that is adjusted periodically. Because of their adjustable interest rates, the value of “floating-rate” or “variable-rate” bonds fluctuates much less in response to market interest rate movements than the value of fixed rate bonds. A Fund may treat some of these bonds as having a shorter maturity for purposes of calculating the weighted average maturity of its investment portfolio. Bonds may be senior or subordinated obligations. Senior obligations generally have the first claim on a corporation's earnings and assets and, in the event of liquidation, are paid before subordinated obligations. Bonds may be unsecured (backed only by the issuer's general creditworthiness) or secured (also backed by specified collateral). The investment return of corporate bonds reflects interest on the bond and changes in the market value of the bond. The market value of a corporate bond may be affected by the credit rating of the corporation, the corporation's performance and perceptions of the corporation in the market place. There is a risk that the issuers of the securities may not be able to meet their obligations on interest or principal payments at the time called for by such a security.

Cash Reserves

Each Fund may hold portions of its assets in cash or short-term debt instruments with remaining maturities of 397 days or less pending investment or to meet anticipated redemptions and day-to-day operating expenses. Short-term debt instruments consist of: (i) short-term obligations of the U.S. Government, its agencies, instrumentalities, authorities or political subdivisions; (ii) other short-term debt securities rated at the time of purchase Aa or higher by Moody's Investors Service, Inc. (“Moody's”) or AA or higher by S&P or, if unrated, of comparable quality in the opinion of SSGA FM; (iii) commercial paper; (iv) bank obligations, including negotiable certificates of deposit, time deposits and bankers' acceptances; and (v) repurchase agreements.

Cleared Derivatives Transactions

Transactions in some types of derivatives are required to be centrally cleared by applicable rules and regulations and a Fund may also voluntarily centrally clear other transactions that are available for clearing. In a cleared derivatives transaction, a Fund's counterparty to the transaction is a central derivatives clearing organization, or clearing house, rather than a bank or broker. Because the Funds are not members of a clearing house, and only members of a clearing house can participate directly in the clearing house, the Funds hold cleared derivatives through accounts at clearing members. In cleared derivatives transactions, a Fund will make payments (including margin payments) to and receive payments from a clearing house through its accounts at clearing members. Clearing members guarantee performance of their clients' obligations to the clearing house. Centrally cleared derivatives arrangements may be less favorable to a Fund than bilateral (non-cleared) arrangements. For example, a Fund may be required to provide greater amounts of margin for cleared derivatives transactions than for bilateral derivatives transactions. Also, in contrast to bilateral derivatives transactions, a clearing member generally can require termination of existing cleared derivatives transactions at any time and can increase margin requirements above the margin that the clearing member required at the beginning of a transaction. Clearing houses also have broad rights to increase margin requirements for existing transactions or to terminate transactions at any time. A Fund is subject to risk if it enters into a derivatives transaction that is required to be cleared (or which the Adviser expects to be cleared), and no clearing member is willing or able to clear the transaction on a Fund's behalf. In that case, the transaction might have to be terminated, and a Fund could lose some or all of the benefit of the transaction, including loss of an increase in the value of the transaction and loss of hedging protection. In addition, the documentation governing the relationship between a Fund and clearing members is drafted by the clearing members and generally is less favorable to a Fund than typical bilateral derivatives documentation. For example, documentation relating to cleared derivatives generally includes a one-way indemnity by the Fund in favor of the clearing member for losses the clearing member incurs as the Fund's clearing member. Also, such documentation typically does not provide the Fund any remedies if the clearing member defaults or becomes insolvent.

Counterparty risk with respect to derivatives has been and will continue to be affected by rules and regulations relating to the derivatives market. With respect to a centrally cleared transaction, a party is subject to the credit risk of the clearing house and the clearing member through which it holds its cleared position. Credit risk of market participants with respect to centrally cleared derivatives is concentrated in a few clearing houses and increasingly fewer clearing members. It is not clear how an insolvency proceeding of a clearing house would be conducted and what impact an insolvency of a clearing house would have on the financial system. A clearing member is obligated by contract and regulation to segregate all funds received from customers with respect to cleared derivatives positions from the clearing member's proprietary assets. However, all funds and other property received by a clearing member from its customers with respect to cleared derivatives are generally held by the clearing member on a commingled basis in an omnibus account (which can be invested in instruments permitted under the regulations). Therefore, a Fund might not be fully protected in the event of the bankruptcy of the Fund's clearing member because the Fund would be limited to recovering only a pro rata share of the funds held by the clearing member on behalf of customers with respect to the relevant account class, with a claim against the clearing member for any deficiency. Also, the clearing member is required to transfer to the clearing house the amount of margin required by the clearing house for cleared derivatives, which amount is generally held in an omnibus account at the clearing house for all customers of the clearing member. Regulations promulgated by the Commodity Futures Trading Commission (the “CFTC”) require that the clearing member notify the clearing house of the initial margin provided by the clearing member to the clearing house that is attributable to each customer. However, if the clearing member does not accurately report the Fund's initial margin, the Fund is subject to the risk that a clearing house will use the assets attributable to it in the clearing house's omnibus account to satisfy payment obligations a defaulting customer of the clearing member has to the clearing house. In addition, clearing members generally provide the clearing house the net amount of variation margin required for cleared derivatives for all of its customers, rather than individually for each customer. A Fund is therefore subject to the risk that a clearing house will not make margin payments owed to the Fund if another customer of the clearing member has suffered a loss and is in default, and the risk that the Fund will be required

to provide additional variation margin to the clearing house before the clearing house will move the Fund's cleared derivatives positions to another clearing member. In addition, if a clearing member does not comply with the applicable regulations or its agreement with the Fund fails to maintain accurate records, or in the event of fraud or misappropriation of customer assets by a clearing member, the Fund could have only an unsecured creditor claim in an insolvency of the clearing member with respect to the margin held by the clearing member. In addition, a Fund may be subject to execution risk if it enters into a derivatives transaction that is required to be (or the Fund expects to be) cleared, and no clearing member is willing to clear the transaction on the Fund's behalf. In that case, the transaction might have to be terminated, and the Fund could lose some or all of the benefit of any increase in the value of the transaction after the time of the trade.

Russia Sanctions Risk

Following Russia's invasion of Ukraine in late February 2022, various countries, including the U.S. and the U.K., as well as the E.U., issued broad-ranging economic sanctions against Russia. The U.S. and other countries have also imposed economic sanctions on Belarus and may impose sanctions on other countries that support Russia's invasion. A large number of corporations and U.S. states have also announced plans to divest interests or otherwise curtail business dealings with certain Russian businesses. These sanctions and any additional sanctions or other intergovernmental actions that have been or may be undertaken in the future, against Russia, Russian entities or Russian individuals, or other countries that support Russia's military invasion, may result in the devaluation of Russian currency, a downgrade in the country's credit rating, an immediate freeze of Russian assets, a decline in the value and liquidity of Russian securities, property or interests, and/or other adverse consequences to the Russian economy or a Fund. The scope and scale of sanctions in place at a particular time may be expanded or otherwise modified in a way that have negative effects on a Fund. Sanctions, or the threat of new or modified sanctions, could impair the ability of a Fund to buy, sell, hold, receive, deliver or otherwise transact in certain affected securities or other investment instruments. Sanctions could also result in Russia taking counter measures or other actions in response (including cyberattacks and espionage), which may further impair the value and liquidity of Russian securities. These sanctions, and the resulting disruption of the Russian economy, may cause volatility in other regional and global markets and may negatively impact the performance of various sectors and industries, as well as companies in other countries, which could have a negative effect on the performance of a Fund, even if a Fund does not have direct exposure to securities of Russian issuers. As a collective result of the imposition of sanctions, Russian government countermeasures and the impact that they have had on the trading markets for Russian securities, certain Funds have used, and may in the future use, fair valuation procedures approved by the Fund's Board to value certain Russian securities, which could result in such securities being deemed to have a zero value.

Swap Execution Facilities

Certain derivatives contracts are required to be (or are capable of being) executed through swap execution facilities (“SEFs”). A SEF is a trading platform where multiple market participants can execute derivatives by accepting bids and offers made by multiple other participants in the platform. For derivatives that are required to be traded on a SEF, such requirements may make it more difficult and costly for investment funds, such as a Fund, to enter into highly tailored or customized transactions. Trading derivatives on a SEF may offer certain advantages over traditional bilateral over-the-counter trading, such as ease of execution, price transparency, increased liquidity and/or favorable pricing. Execution through a SEF is not, however, without additional costs and risks, as parties are required to comply with SEF and CFTC rules and regulations, including disclosure and recordkeeping obligations, and SEF rights of inspection, among others. SEFs typically charge fees, and if a Fund executes derivatives on a SEF through a broker intermediary, the intermediary may impose fees as well. A Fund also may be required to indemnify a SEF, or a broker intermediary who executes derivatives on a SEF on the Fund's behalf, against any losses or costs that may be incurred as a result of the Fund's transactions on the SEF. In addition, a Fund may be subject to execution risk if it enters into a derivatives transaction that is required to be (or the Adviser expects to be) executed on a SEF and cleared, and no SEF or clearing member is willing to accept and clear the transaction on the Fund's behalf. In that case, the transaction might have to be terminated, and the Fund could lose some or all of the benefit of any increase in the value of the transaction after the time of the trade.

Risks Associated with Derivatives Regulation

by making some types of derivatives no longer available to the Fund, increasing margin or capital requirements, or otherwise limiting liquidity or increasing transaction costs. While the rules and regulations and central clearing of some derivatives transactions are designed to reduce systemic risk (i.e., the risk that the interdependence of large derivatives dealers could cause them to suffer liquidity, solvency or other challenges simultaneously), there is no assurance that they will achieve that result, and in the meantime, as noted above, central clearing and related requirements expose the Funds to other kinds of costs and risks.

In the event of a counterparty's (or its affiliate's) insolvency, a Fund's ability to exercise remedies, such as the termination of transactions, netting of obligations and realization on collateral, could be stayed or eliminated under special resolution regimes adopted in the United States, the E.U., the U.K. and various other jurisdictions. Such regimes provide government authorities with broad authority to intervene when a financial institution is experiencing financial difficulty. In particular, with respect to counterparties who are subject to such proceedings in the E.U. and the U.K. the liabilities of such counterparties to the Funds could be reduced, eliminated, or converted to equity in such counterparties (sometimes referred to as a “bail in”).

Additionally, U.S. regulators, the E.U., the U.K. and certain other jurisdictions have adopted minimum margin and capital requirements for uncleared derivatives transactions. These rules impose minimum margin requirements on derivatives transactions between a Fund and its counterparties and may increase the amount of margin a Fund is required to provide. They impose regulatory requirements on the timing of transferring margin and the types of collateral that parties are permitted to exchange.

Since 2021, the SEC has proposed and, in some cases, finalized several new rules regarding a wide range of topics related to the Funds. For example, the SEC has proposed new rules requiring the reporting and public disclosure of a manager's positions in security-based swaps, including CDS, equity total return swaps and related positions. The SEC has also finalized new rules restricting activities that could be considered to be manipulative in connection with security-based swaps, new rules requiring managers to file monthly confidential reports with the SEC regarding equity short sales and related activity, new rules regarding regulatory and public reporting of certain securities lending transactions, and new rules requiring the central clearing of certain cash and repurchase transactions involving U.S. Treasuries. These and other proposed new rules, whether assessed on an individual or collective basis, could fundamentally change the current regulatory framework for relevant markets and market participants, including having a material impact on activities of investment managers and their funds. While it is currently difficult to predict the full impact of these new rules, particularly because the compliance dates for many of the rules has not yet occurred and could be subject to delays, these rules could make it more difficult for the Fund to execute certain investment strategies and may have an adverse effect on a Fund's ability to generate returns.

These and other regulations are evolving, so their full impact on the Funds and the financial system are not yet known.

Commodities

General. The Funds may invest in commodities. There are several additional risks associated with transactions in commodity futures contracts, swaps on commodity futures contracts, commodity forward contracts and other commodities instruments. In the commodity instruments markets, producers of the underlying commodity may decide to hedge the price risk of selling the commodity by selling commodity instruments today to lock in the price of the commodity at delivery tomorrow. In order to induce speculators to purchase the other side of the same commodity instrument, the commodity producer generally must sell the commodity instrument at a lower price than the expected future spot price. Conversely, if most hedgers in the commodity instruments market are purchasing commodity instruments to hedge against a rise in prices, then speculators will only sell the other side of the commodity instrument at a higher future price than the expected future spot price of the commodity. The changing nature of the hedgers and speculators in the commodity markets will influence whether futures prices are above or below the expected future spot price, which can have significant implications for the Funds. If the nature of hedgers and speculators in commodity instruments markets has shifted when it is time for a

Fund to reinvest the proceeds of a maturing contract in a new commodity instrument, the Fund might reinvest at a higher or lower future price, or choose to pursue other investments. The commodities which underlie commodity instruments may be subject to additional economic and non-economic variables, such as drought, floods, weather, livestock disease, embargoes, tariffs, war and international economic, political and regulatory developments. These factors may have a larger impact on commodity prices and commodity-linked instruments than on traditional securities. Certain commodities are also subject to limited pricing flexibility because of supply and demand factors. Others are subject to broad price fluctuations as a result of the volatility of the prices for certain raw materials and the instability of supplies of other materials. These additional variables may create additional investment risks. which subject a Fund's investments to greater volatility than other investments. Also, unlike the financial instruments markets, in the commodity instruments markets there are costs of physical storage associated with purchasing the underlying commodity. The price of the commodity instruments contract will reflect the storage costs of purchasing the physical commodity, including the time value of money invested in the physical commodity. To the extent that the storage costs for an underlying commodity change while a Fund is invested in instruments on that commodity, the value of the commodity instrument may change proportionately.

Commodity-Linked Investments. The Funds may invest in commodity-linked investments. The Funds may seek to provide exposure to the investment returns of real assets that trade in the commodity markets through commodity-linked derivatives securities, such as structured notes, discussed below, which are designed to provide this exposure without direct investment in physical commodities or commodities futures contracts. Real assets are assets such as oil, gas, industrial and precious metals, livestock, and agricultural or meat products, or other items that have tangible properties, as compared to stocks or bonds, which are financial instruments. In choosing investments, the Adviser seeks to provide exposure to various commodities and commodity sectors. The value of commodity-linked derivatives securities held by a Fund may be affected by a variety of factors, including, but not limited to, overall market movements and other factors affecting the value of particular industries or commodities, such as weather, disease, embargoes, acts of war or terrorism, or political and regulatory developments.

The prices of commodity-linked derivatives securities may move in different directions than investments in traditional equity and debt securities when the value of those traditional securities is declining due to adverse economic conditions. As an example, during periods of rising inflation, debt securities have historically tended to decline in value due to the general increase in prevailing interest rates. Conversely, during those same periods of rising inflation, the prices of certain commodities, such as oil and metals, have historically tended to increase. Of course, there cannot be any guarantee that these investments will perform in that manner in the future, and at certain times the price movements of commodity-linked instruments have been parallel to those of debt and equity securities. Commodities have historically tended to increase and decrease in value during different parts of the business cycle than financial assets. Nevertheless, at various times, commodities prices may move in tandem with the prices of financial assets and thus may not provide overall portfolio diversification benefits. Under favorable economic conditions, a Fund's investments may be expected to underperform an investment in traditional securities. Over the long term, the returns on the Fund's investments are expected to exhibit low or negative correlation with stocks and bonds.

Because commodity-linked investments are available from a relatively small number of issuers, a Fund's investments will be particularly subject to counterparty risk, which is the risk that the issuer of the commodity-linked derivatives (which issuer may also serve as counterparty to a substantial number of the Fund's commodity-linked and other derivatives investments) will not fulfill its contractual obligations.

A Fund's ability to invest in commodity-linked investments may be limited by the Fund's intention to qualify as a regulated investment company (“RIC”) under the Internal Revenue Code of 1986 (the “Code”) and could bear on the ability of a Fund to so qualify. See “Taxation of the Funds” below.

Credit Default Swaps and Total Return Swaps

The Funds may enter into credit default swaps or total return swaps to gain market exposure, manage liquidity, increase total returns or for hedging purposes. Credit default swaps and total return swaps are typically governed by the negotiated terms and conditions of an industry standard ISDA Master Agreement.

A credit default swap involves a protection buyer and a protection seller. The Funds may be either a protection buyer or seller. The protection buyer in a credit default swap makes periodic premium payments to the protection seller during the swap term in exchange for the protection seller agreeing to make certain defined payments to the protection buyer in the event certain defined credit events occur with respect to a particular reference instrument, issuer or basket of reference instruments. A total return swap involves a total return receiver and a total return payor. The Funds may either be a total

return receiver or payor. Generally, the total return payor sells to the total return receiver an amount equal to all cash flows and price appreciation on a defined security or asset payable at periodic times during the swap term (i.e., credit risk) in return for a periodic payment from the total return receiver based on a designated interest rate and spread plus the amount of any price depreciation on the reference security or asset. The total return payor does not need to own the underlying security or asset to enter into a total return swap. The final payment at the end of the swap term includes final settlement of the current market price of the underlying reference security or asset, and payment by the applicable party for any appreciation or depreciation in value. Usually, collateral must be exchanged by the parties to secure their obligations under the swap, and the collateral amount is marked-to-market daily equal to the market price of the underlying reference security or asset between periodic payment dates.

In both credit default swaps and total return swaps, the same general risks inherent to derivatives transactions are present; however, the use of credit default swaps and total return swaps can involve greater risks than if the Funds had invested in the reference obligation directly since, in addition to general market risks, credit default swaps and total return swaps are subject to counterparty credit risk, leverage risk, hedging risk, correlation risk and liquidity risk. The Funds will enter into credit default swap or a total return swap only with counterparties that the Adviser determines to meet certain standards of creditworthiness. In a credit default swap, a buyer generally also will lose its premium and recover nothing should no credit event occur and the swap is held to its termination date. If a credit event were to occur, the value of any deliverable obligation received by the seller, coupled with the upfront or periodic payments previously received, may be less than the full notional value it pays to the buyer, resulting in a loss of value to the seller. A Fund's obligations under a credit default swap agreement will be accrued daily (offset against any amounts owing to the Fund).

Swaps are highly specialized instruments that require investment techniques, risk analyses, and tax planning different from those associated with the ownership of stocks, bonds, and other traditional investments. The use of a swap agreement requires an understanding not only of the referenced obligation, reference rate, or index, but also of the swap agreement itself. Because some swap agreements have a leverage component, adverse changes in the value or level of the underlying asset, reference rate, or index can result in a loss substantially greater than the amount invested in the swap itself. Certain swaps have the potential for unlimited loss, regardless of the size of the initial investment.

Custodial Risk

There are risks involved in dealing with the custodians or brokers who hold a Fund's investments or settle a Fund's trades. It is possible that, in the event of the insolvency or bankruptcy of a custodian or broker, a Fund would be delayed or prevented from recovering its assets from the custodian or broker, or its estate, and may have only a general unsecured claim against the custodian or broker for those assets. In recent insolvencies of brokers or other financial institutions, the ability of certain customers to recover their assets from the insolvent's estate has been delayed, limited, or prevented, often unpredictably, and there is no assurance that any assets held by a Fund with a custodian or broker will be readily recoverable by the Fund. In addition, there may be limited recourse against non-U.S. sub-custodians in those situations in which a Fund invests in markets where custodial and/or settlement systems and regulations are not fully developed, including emerging markets, and the assets of the Fund have been entrusted to such sub-custodians. SSGA FM or an affiliate may serve as the custodian of the Funds.

Eurodollar Certificates of Deposit (“ECDs”), Eurodollar Time Deposits (“ETDs”) and Yankee Certificates of Deposit (“YCDs”)

The Funds may invest in ECDs, ETDs and YCDs. ECDs and ETDs are U.S. dollar denominated certificates of deposit and time deposits, respectively, issued by non-U.S. branches of domestic banks and non-U.S. banks. YCDs are U.S. dollar denominated certificates of deposit issued by U.S. branches of non-U.S. banks.

Different risks than those associated with the obligations of domestic banks may exist for ECDs, ETDs and YCDs because the banks issuing these instruments, or their domestic or non-U.S. branches, are not necessarily subject to the same regulatory requirements that apply to domestic banks, such as loan limitations, examinations and reserve, accounting, auditing, recordkeeping and public reporting requirements. Obligations of non-U.S. issuers also involve risks such as future unfavorable political and economic developments, withholding or other taxes, seizures of non-U.S. deposits, currency controls, interest limitations, and other governmental restrictions that might affect repayment of principal or payment of interest, or the ability to honor a credit commitment.

Foreign Currency Transactions and Foreign Currency Derivatives

The Funds may enter into a variety of different foreign currency transactions, including, by way of example, currency forward transactions, spot transactions, futures and forward contracts, swaps, or options. Most of these transactions are entered into “over the counter,” and a Fund assumes the risk that the counterparty may be unable or unwilling to perform its obligations, in addition to the risk of unfavorable or unanticipated changes in the values of the currencies underlying the transactions. Certain types of over-the-counter currency transactions may be uncollateralized, and a Fund may not be able to recover all or any of the assets owed to it under such transactions if its counterparty should default. In some markets or in respect of certain currencies, a Fund may be required, or agree, in SSGA FM's discretion, to enter into foreign currency transactions via the custodian's relevant sub-custodian. SSGA FM may be subject to a conflict of interest in agreeing to any such arrangements on behalf of a Fund. Such transactions executed directly with the sub-custodian are executed at a rate determined solely by such sub-custodian. Accordingly, a Fund may not receive the best pricing of such currency transactions. Regulatory changes in a number of jurisdictions may require that certain currency transactions be subject to central clearing, or be subject to new or increased collateral requirements. These changes could increase the costs of currency transactions to a Fund and may make certain transactions unavailable; they may also increase the credit risk of such transactions to a Fund.

Foreign Securities

The Funds are permitted to invest in foreign securities. Foreign securities include securities of foreign companies and foreign governments (or agencies or subdivisions thereof). If a Fund's securities are held abroad, the countries in which such securities may be held and the sub-custodian holding them must be approved by the Board of Trustees of the Trust (the “Board of Trustees” or the “Board”) or its delegate under applicable rules adopted by the Securities and Exchange Commission (“SEC”). In buying foreign securities, the Fund may convert U.S. dollars into foreign currency, but only to effect securities transactions on foreign securities exchanges and not to hold such currency as an investment.

The globalization and integration of the world economic system and related financial markets have made it increasingly difficult to define issuers geographically. Accordingly, each Fund intends to construe geographic terms such as “foreign,” “non-U.S.” “European,” “Latin American,” and “Asian,” in the manner that affords to the Fund the greatest flexibility in seeking to achieve its investment objective(s). Specifically, in circumstances where the investment objective and/or strategy is to invest at least some percentage of the Fund's assets in foreign securities, etc., the Funds will take the view that a security meets this description so long as the issuer of a security is tied economically to the particular country or geographic region indicated by words of the relevant investment objective and/or strategy (the “Relevant Language”). For these purposes the issuer of a security is deemed to have that tie if:

(i)

The issuer is organized under the laws of the country or a country within the geographic region suggested by the Relevant Language or maintains its principal place of business in that country or region; or

(ii)

The securities are traded principally in the country or region suggested by the Relevant Language; or

(iii)

The issuer, during its most recent fiscal year, derived at least 50% of its revenues or profits from goods produced or sold, investments made, or services performed in the country or region suggested by the Relevant Language or has at least 50% of its assets in that country or region.

In addition, the Funds intend to treat derivatives securities (e.g., call options) by reference to the underlying security. Conversely, if the investment objective and/or strategy of the Fund limits the percentage of assets that may be invested in “foreign securities,” etc. or prohibits such investments altogether, the Funds intend to categorize securities as “foreign,” etc. only if the security possesses all of the attributes described above in clauses (i), (ii) and (iii).

certain other risks, such as the possibility of one or more of the following: imposition of dividend or interest withholding or other taxes (in each case, which taxes could potentially be confiscatory), higher brokerage costs, thinner trading markets, currency blockages or transfer restrictions, expropriation, nationalization, military coups or other adverse political or economic developments; less government supervision and regulation of securities exchanges, brokers and listed companies; and the difficulty of enforcing obligations in other countries. Purchases of foreign securities are usually made in foreign currencies and, as a result, a Fund may incur currency conversion costs and may be affected favorably or unfavorably by changes in the value of foreign currencies against the U.S. dollar. Further, it may be more difficult for a Fund's agents to keep currently informed about corporate actions, which may affect the prices of portfolio securities. Communications between the United States and foreign countries may be less reliable than within the United States, thus increasing the risk of delayed settlements of portfolio transactions or loss of certificates for portfolio securities. Certain markets may require payment for securities before delivery. A Fund's ability and decisions to purchase and sell portfolio securities may be affected by laws or regulations relating to the convertibility of currencies and repatriation of assets.

A number of current significant political, demographic and economic developments may affect investments in foreign securities and in securities of companies with operations overseas. Such developments include dramatic political changes in government and economic policies in several Eastern European countries and the republics composing the former Soviet Union, as well as the unification of the European Economic Community. The course of any one or more of these events and the effect on trade barriers, competition and markets for consumer goods and services are uncertain. Similar considerations are of concern with respect to developing countries. For example, the possibility of revolution and the dependence on foreign economic assistance may be greater in these countries than in developed countries. Management seeks to mitigate the risks associated with these considerations through diversification and active professional management.

Forward Commitments

Futures Contracts and Options on Futures

Each Fund may enter into futures contracts on securities in which it may invest or on indices comprised of such securities and may purchase and write call and put options on such contracts.

Futures contracts. A financial futures contract is a contract to buy or sell a specified quantity of financial instruments such as U.S. Treasury bills, notes and bonds at a specified future date at a price agreed upon when the contract is made. An index futures contract is a contract to buy or sell specified units of an index at a specified future date at a price agreed upon when the contract is made. The value of a unit is based on the current value of the index. Under such contracts no delivery of the actual securities making up the index takes place. Rather, upon expiration of the contract, settlement is made by exchanging cash in an amount equal to the difference between the contract price and the closing price of the index at expiration, net of variation margin previously paid. Futures contracts are traded in the United States only on commodity exchanges or boards of trade — known as “contract markets” — approved for such trading by the Commodity Futures Trading Commission (the “CFTC”), and must be executed through a futures commission merchant or brokerage firm, which is a member of the relevant contract market.

Although many futures contracts by their terms call for actual delivery or acceptance of the underlying commodities securities or other instrument, in most cases the contracts are closed out before the settlement date without the making or taking of delivery, but rather by entering into an offsetting contract (a “closing transaction”). Upon entering into a futures contract, a Fund is required to deposit initial margin with the futures broker. The initial margin serves as a “good faith” deposit that a Fund will honor its potential future commitments. Subsequent payments (called “variation margin” or “maintenance margin”) to and from the broker are made on a daily basis as the price of the underlying instrument fluctuates, making the long and short positions in the futures contract more or less valuable, a process known as “marking to the market.” If a Fund is unable to enter into a closing transaction, the amount of the Fund's potential loss may be unlimited. Futures contracts also involve brokerage costs.

Each Fund will not commit more than 5% of the market value of its total assets to initial margin deposits on futures and premiums paid for options on futures.

Registration under the Commodity Exchange Act. The Funds are operated by the Adviser, which has claimed an exclusion from the definition of the term “commodity pool operator” with respect to the Funds, under the Commodity Exchange Act (the “CEA”), and therefore, is not subject to registration or regulation as a commodity pool operator under the CEA. As a result, the Funds are limited in their ability to trade instruments subject to the CFTC's jurisdiction, including commodity futures (which include futures on broad-based securities indexes, interest rate futures and currency futures), options on commodity futures, certain swaps or other investments (whether directly or indirectly through investments in other investment vehicles).

Under this exclusion, a Fund must satisfy one of the following two trading limitations whenever it enters into a new commodity trading position: (1) the aggregate initial margin and premiums required to establish the Fund's positions in CFTC-regulated instruments may not exceed 5% of the liquidation value of the Fund's portfolio (after accounting for unrealized profits and unrealized losses on any such investments); or (2) the aggregate net notional value of such instruments, determined at the time the most recent position was established, may not exceed 100% of the liquidation value of the Fund's portfolio (after accounting for unrealized profits and unrealized losses on any such positions). A Fund would not be required to consider its exposure to such instruments if they were held for “bona fide hedging” purposes, as such term is defined in the rules of the CFTC. In addition to meeting one of the foregoing trading limitations, the Fund may not market itself as a commodity pool or otherwise as a vehicle for trading in the markets for CFTC-regulated instruments.

Options on futures contracts. In return for the premium paid, options on futures contracts give the purchaser the right to assume a position in a futures contract at the specified option exercise price at any time during the exercisable period of the option. Options on futures are similar to options on securities except that options on futures give the purchaser the right, in return for the premium paid, to assume a position in a futures contract (a long position if the option is a call and a short position if the option is a put) at a specified exercise price at any time during the exercisable period of the option. Upon exercise of the option, the delivery of the futures position by the writer of the option to the holder of the option will be accompanied by delivery of the accumulated balance in the writer's futures margin account which represents the amount by which the market price of the futures contract, at exercise, exceeds (in the case of a call) or is less than (in the case of a put) the exercise price of the option on the futures. If an option is exercised on the last trading day prior to its expiration date, the settlement will be made entirely in cash. Purchasers of options who fail to exercise their options prior to the expiration date suffer a loss of the premium paid.

As with options on securities, the holder or writer of an option may terminate his position by selling or purchasing an offsetting option. There is no guarantee that such closing transactions can be effected.

A Fund will be required to deposit initial margin and maintenance margin with respect to put and call options on futures contracts written by it pursuant to brokers' requirements similar to those described above in connection with the discussion of futures contracts.

Risks of transactions in futures contracts and related options. Successful use of futures contracts by a Fund is subject to the Adviser's ability to predict movements in various factors affecting financial markets. Compared to the purchase or sale of futures contracts, the purchase of call or put options on futures contracts involves less potential risk to a Fund because the maximum amount at risk is the premium paid for the options (plus transaction costs). However, there may be circumstances when the purchase of a call or put option on a futures contract would result in a loss to a Fund when the purchase or sale of a futures contract would not, such as when there is no movement in the prices of the hedged investments. The writing of an option on a futures contract involves risks similar to those risks relating to the sale of futures contracts.

The use of options and futures strategies involves the risk of imperfect correlation among movements in the prices of the securities underlying the futures and options purchased and sold by the Fund, of the options and futures contracts themselves, and, in the case of hedging transactions, of the underlying instruments which are the subject of a hedge. The successful use of these strategies further depends on the ability of the Adviser to forecast interest rates and market movements correctly.

There is no assurance that higher than anticipated trading activity or other unforeseen events might not, at times, render certain market clearing facilities inadequate, and thereby result in the institution by exchanges of special procedures which may interfere with the timely execution of customer orders.

To reduce or eliminate a position held by a Fund, the Fund may seek to close out such a position. The ability to establish and close out positions will be subject to the development and maintenance of a liquid market. It is not certain that this market will develop or continue to exist for a particular futures contract or option. Reasons for the absence of a liquid market on an exchange include the following: (i) there may be insufficient trading interest in certain contracts or options;

(ii) restrictions may be imposed by an exchange on opening transactions or closing transactions or both; (iii) trading halts, suspensions or other restrictions may be imposed with respect to particular classes or series of contracts or options, or underlying securities; (iv) unusual or unforeseen circumstances may interrupt normal operations on an exchange; (v) the facilities of an exchange or a clearing corporation may not at all times be adequate to handle current trading volume; or (vi) one or more exchanges could, for economic or other reasons, decide or be compelled at some future date to discontinue the trading of contracts or options (or a particular class or series of contracts or options), in which event the market on that exchange for such contracts or options (or in the class or series of contracts or options) would cease to exist, although outstanding contracts or options on the exchange that had been issued by a clearing corporation as a result of trades on that exchange would likely continue to be exercisable in accordance with their terms.

The CFTC, and foreign regulators, and many futures exchanges have established (and continue to evaluate and revise) limits, referred to as “position limits,” on the maximum net long or net short positions which any person or entity may hold or control in particular options and futures contracts. In addition, U.S. federal position limits apply to swaps that are economically equivalent to futures contracts on certain agricultural, metals and energy commodities. Unless an exemption applies, all positions owned or controlled by the same person or entity, even if in different accounts, must be aggregated for purposes complying with position limits. It is possible that positions of different clients managed by the Adviser and its affiliates may be aggregated for this purpose. Therefore, the trading decisions of the Adviser may have to be modified and positions held by the Fund may have to be liquidated in order to avoid exceeding such limits. The modification of investment decisions or the elimination of open positions, if it occurs, may adversely affect the profitability of the Fund. A violation of position limits could also lead to regulatory action materially adverse to the Fund's investment strategy. A Fund may also be affected by regimes of the EU and UK that impose position limits on its trade of commodity derivative contracts.

Futures and options transactions on markets located outside the United States, including markets formally linked to a United States market, may be subject to regulations which offer different or diminished protection to a Fund and its investors. Further, United States regulatory authorities may be unable to compel the enforcement of the rules of regulatory authorities or markets in non-United States jurisdictions where transactions for the Fund may be effected.

U.S. Treasury security futures contracts and options. Some U.S. Treasury security futures contracts require the seller to deliver, or the purchaser to take delivery of, the type of U.S. Treasury security called for in the contract at a specified date and price; others may be settled in cash. Options on U.S. Treasury security futures contracts give the purchaser the right in return for the premium paid to assume a position in a U.S. Treasury security futures contract at the specified option exercise price at any time during the exercisable period of the option.

Successful use of U.S. Treasury security futures contracts by a Fund is subject to the Adviser's ability to predict movements in the direction of interest rates and other factors affecting markets for debt securities. For example, if a Fund has sold U.S. Treasury security futures contracts in order to hedge against the possibility of an increase in interest rates which would adversely affect the values of securities held in its portfolio, and the prices of the Fund's securities increase instead as a result of a decline in interest rates, the Fund will lose part or all of the benefit of the increased value of its securities which it has hedged because it will have offsetting losses in its futures positions. In addition, in such situations, if the Fund has insufficient cash, it may have to sell securities to meet daily maintenance margin requirements at a time when it may be disadvantageous to do so.

There is also a risk that price movements in U.S. Treasury security futures contracts and related options will not correlate closely with price movements in markets for particular securities. For example, if a Fund has hedged against a decline in the values of tax-exempt securities held by it by selling Treasury security futures and the values of Treasury securities subsequently increase while the values of the Fund's tax-exempt securities decrease, the Fund would incur losses on both the Treasury security futures contracts written by it and the tax-exempt securities held in its portfolio.

Government Mortgage-Related Securities

the U.S. Government, regardless of whether they have been collected. GNMA pass-through securities are, however, subject to the same interest rate risk as comparable privately issued mortgage-related securities. Therefore, the effective maturity and market value of a Fund's GNMA securities can be expected to fluctuate in response to changes in interest rate levels.

High Yield Securities

The Funds may invest a portion of their assets in high yield debt securities (commonly known as “junk bonds”). Investment in high yield securities generally provides greater income and increased opportunity for capital appreciation than investments in higher quality securities, but they also typically entail greater price volatility and credit risk. These high yield securities are regarded as predominantly speculative with respect to the issuer's continuing ability to meet principal and interest payments. Analysis of the creditworthiness of issuers of debt securities that are high yield may be more complex than for issuers of higher quality debt securities. In addition, high yield securities are often issued by smaller, less creditworthy companies or by highly leveraged (indebted) firms, but can also be issued by governments. Such issuers are generally less able than more financially stable issuers to make scheduled payments of interest and principal. The risks posed by securities issued under such circumstances are substantial.

Investing in high yield debt securities involves risks that are greater than the risks of investing in higher quality debt securities. These risks include: (i) changes in credit status, including weaker overall credit conditions of issuers and risks of default; (ii) industry, market and economic risk; and (iii) greater price variability and credit risks of certain high yield securities such as zero-coupon and payment-in-kind securities. While these risks provide the opportunity for maximizing return over time, they may result in greater volatility of the value of the Fund than a fund that invests in higher-rated securities.

Furthermore, the value of high yield securities may be more susceptible to real or perceived adverse economic, company or industry conditions than is the case for higher quality securities. The market values of certain of these lower-rated and unrated debt securities tend to reflect individual issuer developments to a greater extent than do higher-rated securities which react primarily to fluctuations in the general level of interest rates, and tend to be more sensitive to economic conditions than are higher-rated securities. Adverse market, credit or economic conditions could make it difficult at certain times to sell certain high yield securities held by a Fund.

The secondary market on which high yield securities are traded may be less liquid than the market for higher grade securities. Less liquidity in the secondary trading market could adversely affect the price at which a Fund could sell a high yield security, and could adversely affect the daily net asset value (“NAV”) per share of a Fund. When secondary markets for high yield securities are less liquid than the market for higher grade securities, it may be more difficult to value the securities because there is less reliable, objective data available. However, an Index seeks to include primarily high yield securities that the Index provider believes have greater liquidity than the broader high yield securities market as a whole.

The use of credit ratings as a principal method of selecting high yield securities can involve certain risks. For example, credit ratings evaluate the safety of principal and interest payments, not the market value risk of high yield securities. Also, credit rating agencies may fail to change credit ratings in a timely fashion to reflect events since the security was last rated.

Illiquid Securities

Each Fund may invest in illiquid investments. Each Fund will invest no more than 15% of its net assets in illiquid investments, including repurchase agreements and time deposits of more than seven days' duration. The absence of a regular trading market for illiquid investments imposes additional risks on investments in these securities. Illiquid investments may be difficult to value and may often be disposed of only after considerable expense and delay.

The SEC has adopted a liquidity risk management rule (the “Liquidity Rule”) that requires the Funds to establish a liquidity risk management program (the “LRMP”). The Trustees, including a majority of the Independent Trustees (defined infra), have designated the Adviser to administer the Funds' LRMP. Under the LRMP, the Adviser assesses, manages, and periodically reviews the Funds' liquidity risk. The Liquidity Rule defines “liquidity risk” as the risk that the Funds could not meet requests to redeem shares issued by the Funds without significant dilution of remaining investors' interests in the Funds. The liquidity of the Funds' portfolio investments is determined based on relevant market, trading and investment-specific considerations under the LRMP. To the extent that an investment is deemed to be an illiquid investment or a less liquid investment, the Funds can expect to be exposed to greater liquidity risk. While the liquidity risk management program attempts to assess and manage liquidity risk, there is no guarantee it will be effective in its operations and may not reduce the liquidity risk inherent in a Fund's investments. The SEC has recently proposed amendments to Rule 22e-4 under the 1940 Act and Rule 22c-1 under the 1940 Act that, if adopted, would, among other things, cause more investments to be treated as illiquid, and could prevent a Fund from investing in securities that the Adviser believes are appropriate or desirable.

Infrastructure-Related Companies Risk

Infrastructure-related companies include companies that primarily own, manage, develop and/or operate infrastructure assets, including transportation, utility, energy and/or telecommunications assets. Infrastructure-related businesses are subject to a variety of factors that may adversely affect their business or operations, including high interest costs in connection with capital construction programs, insurance costs, costs associated with environmental and other regulations, the effects of an economic slowdown, surplus capacity or technological obsolescence, industry competition, labor relations, rate caps or rate changes, uncertainties concerning availability of fuel at reasonable prices, the effects of energy conservation policies, natural disasters, terrorist attacks and other factors. Certain infrastructure-related entities, particularly telecommunications and utilities companies, are subject to extensive regulation by various governmental authorities. The costs of complying with governmental regulations, delays or failures to receive required regulatory approvals or the enactment of new adverse regulatory requirements may adversely affect infrastructure-related companies. Infrastructure-related companies may also be affected by service interruption and/or legal challenges due to environmental, operational or other conditions or events, and the imposition of special tariffs and changes in tax laws, regulatory policies and accounting standards. There is also the risk that corruption may negatively affect publicly-funded infrastructure projects, especially in non-U.S. markets, resulting in work stoppage, delays and cost overruns. Other risks associated with infrastructure-related companies include uncertainties resulting from such companies' diversification into new domestic and international businesses, as well as agreements by any such companies linking future rate increases to inflation or other factors not directly related to the actual operating profits of the enterprise.

Investment Grade Bonds

The Funds may invest in corporate notes and bonds that are rated investment-grade by a nationally recognized statistical rating organization (“NRSRO”) or, if unrated, are of comparable quality to the rated securities described above, as determined by the Adviser, in accordance with procedures established by the Board of Trustees. Investment-grade securities include securities rated Baa or higher by Moody's or BBB- or higher by S&P (and securities of comparable quality); securities rated Baa by Moody's or BBB by S&P may have speculative characteristics.

Lending of Fund Securities

Each Fund may lend portfolio securities to certain creditworthy borrowers in U.S. and non-U.S. markets in an amount not to exceed 40% of the value of its net assets. The borrowers provide collateral that is marked to market daily in an amount at least equal to the current market value of the securities loaned. A Fund may terminate a loan at any time and obtain the securities loaned. A Fund receives the value of any interest or cash or non-cash distributions paid on the loaned securities. A Fund cannot vote proxies for securities on loan, but may recall loans to vote proxies if a material issue affecting the Fund's economic interest in the investment is to be voted upon. Efforts to recall such securities promptly may be unsuccessful, especially for foreign securities or thinly traded securities. Distributions received on loaned securities in lieu of dividend payments (i.e., substitute payments) would not be considered qualified dividend income.

With respect to loans that are collateralized by cash, the borrower typically will be entitled to receive a fee based on the amount of cash collateral. A Fund is compensated by the difference between the amount earned on the reinvestment of cash collateral and the fee paid to the borrower. In the case of collateral other than cash, a Fund is compensated by a fee paid by the borrower equal to a percentage of the market value of the loaned securities. Any cash collateral may be

reinvested in certain high quality short-term instruments either directly on behalf of the lending Fund or through one or more joint accounts or funds, which may include those managed by the Adviser. A Fund could lose money due to a decline in the value of collateral provided for loaned securities or any investments made with cash collateral.

A Fund may pay a portion of the interest or fees earned from securities lending to a borrower as described above, and to one or more securities lending agents approved by the Board of Trustees of the Trust (the “Board”) who administer the lending program for the Funds in accordance with guidelines approved by the Board. In such capacity, the lending agent provides the following services to the Funds in connection with the Funds' securities lending activities: (i) locating borrowers among an approved list of prospective borrowers; (ii) causing the delivery of loaned securities from a Fund to borrowers; (iii) monitoring the value of loaned securities, the value of collateral received, and other lending parameters; (iv) seeking additional collateral, as necessary, from borrowers; (v) receiving and holding collateral from borrowers, and facilitating the investment and reinvestment of all or substantially all cash collateral in an investment vehicle designated by the Funds; (vi) returning collateral to borrowers; (vii) facilitating substitute dividend, interest, and other distribution payments to the Funds from borrowers; (viii) negotiating the terms of each loan of securities, including but not limited to the amount of any loan premium, and monitoring the terms of securities loan agreements with prospective borrowers for consistency with the requirements of the Funds' Securities Lending Authorization Agreement; (ix) selecting securities, including amounts (percentages), to be loaned; (x) recordkeeping and accounting servicing; and (xi) arranging for return of loaned securities to the Fund in accordance with the terms of the Securities Lending Authorization Agreement. State Street Bank and Trust Company (“State Street”), an affiliate of the Trust, has been approved by the Board to serve as securities lending agent for each Fund and the Trust has entered into an agreement with State Street for such services. Among other matters, the Trust has agreed to indemnify State Street for certain liabilities. State Street has received an order of exemption from the SEC under Sections 17(a), 17(d) and 12(d)(1) under the 1940 Act to serve as the lending agent for affiliated investment companies such as the Trust, to invest the cash collateral received from loan transactions in an affiliated cash collateral fund and to receive a fee based on a share of the revenue generated from such transactions.

Securities lending involves exposure to certain risks, including operational risk (i.e., the risk of losses resulting from problems in the settlement and accounting process especially so in certain international markets such as Taiwan), “gap” risk (i.e., the risk of a mismatch between the return on cash collateral reinvestments and the fees a Fund has agreed to pay a borrower), risk of loss of collateral, credit, legal, counterparty and market risk. If a securities lending counterparty were to default, a Fund would be subject to the risk of a possible delay in receiving collateral (or the proceeds of its liquidation) or in recovering the loaned securities. In the event a borrower does not return a Fund's securities as agreed, the Fund may experience losses if the proceeds received from liquidating the collateral do not at least equal the value of the loaned security at the time the collateral is liquidated, plus the transaction costs incurred in purchasing replacement securities. Although State Street has agreed to provide a Fund with indemnification in the event of a borrower default, a Fund is still exposed to the risk of losses in the event a borrower does not return a Fund's securities as agreed. For example, delays in recovery of lent securities may cause a Fund to lose the opportunity to sell the securities at a desirable price with guaranteed delivery provisions.

In response to market events, the SEC has adopted new reporting requirements for securities loans which include the public dissemination of certain information about such loans. These new reporting requirements may negatively impact a Fund's ability to execute certain of its investment strategies. See “Risks Associated with Derivatives Regulation” for additional information.

Market Disruption and Geopolitical Risk

The Funds are subject to the risk that geopolitical events will disrupt securities markets and adversely affect global economies and markets. War, terrorism, and related geopolitical events have led, and in the future may lead, to increased short-term market volatility and may have adverse long-term effects on U.S. and world economies and markets generally. Likewise, trade policy changes or disputes natural and environmental disasters, epidemics or pandemics, and systemic market dislocations may be highly disruptive to economies and markets. Those events as well as other changes in non-U.S. and domestic economic and political conditions also could adversely affect individual issuers or related groups of issuers, securities markets, interest rates, credit ratings, inflation, investor sentiment, and other factors affecting the value of a Fund's investments. Given the increasing interdependence between global economies and markets, conditions in one country, market, or region might adversely impact markets, issuers and/or foreign exchange rates in other countries, including the U.S. Continuing uncertainty as to the status of the euro and the Economic and Monetary Union of the European Union (the “EMU”) has created significant volatility in currency and financial markets generally. Any partial or complete dissolution of the EMU, or any increased uncertainty as to its status, could have significant adverse effects on currency and financial markets, and on the values of a Fund's investments. On January 31, 2020, the United Kingdom

(“UK”) formally withdrew from the European Union (“EU”) (commonly known as “Brexit”). An agreement between the UK and the EU governing their future trade relationship became effective January 1, 2021, but that agreement does not include an agreement on financial services, and it is unlikely that such agreement will be concluded. Moreover, the UK government has started a program of financial services law reform with the ultimate aim of repealing many EU financial services laws that were assimilated into UK law from January 1, 2021, and replacing them with legislation or rules made by the UK government or financial services regulators. Accordingly, uncertainty remains in certain areas as to the future relationship between the UK and the EU. Brexit has already had a significant impact on the UK, Europe, and global economies, and could continue to result in volatility and illiquidity, legal, political, economic and regulatory uncertainties and lower economic growth for these economies that could in turn have an adverse effect on the value of the Funds' investments. Any further exits from the EU, or the possibility of such exits, or the abandonment of the euro, may cause additional market disruption globally and introduce new legal and regulatory uncertainties.

Recent political activity in the U.S. has increased the risk that the U.S. could default on some or any of its obligations. While it is impossible to predict the consequences of such an unprecedented event, it is likely that a default by the U.S. would be highly disruptive to the U.S. and global securities markets and could significantly impair the value of the Funds' investments. Similarly, political events within the U.S. at times have resulted, and may in the future result, in a shutdown of government services, which could negatively affect the U.S. economy, decrease the value of many Fund investments, and increase uncertainty in or impair the operation of the U.S. or other securities markets. To the extent a Fund has focused its investments in the stock market index of a particular region, adverse geopolitical and other events could have a disproportionate impact on the Fund.

Market Turbulence Resulting from Infectious Illness

Mortgage-Backed Security Rolls

The Funds, except for the Emerging Markets Equity Index Fund and the Small/Mid Cap Equity Index Fund, may enter into “forward roll” transactions with respect to mortgage-related securities issued by GNMA, FNMA or FHLMC. In a forward roll transaction, a Fund will sell a mortgage-related security to a bank or other permitted entity and simultaneously agree to repurchase a similar security from the institution at a later date at an agreed upon price. The mortgage securities that are repurchased will typically bear the same interest rate as those sold, but generally will be collateralized by different pools of mortgages with different prepayment histories than those sold. A Fund that engages in a forward roll transaction forgoes principal and interest paid on the securities sold during the roll period, but is compensated by the difference between the current sales price and the lower forward price for the future purchase. In addition, a Fund earns interest by investing the transaction proceeds during the roll period. A forward roll transaction may create investment leverage. A Fund is subject to the risk that the value of securities to be purchased pursuant to a forward roll transaction will decline over the roll period, and that the Fund's counterparty may be unwilling or unable to perform its obligations to the Fund.

Mortgage-Related Securities

The Funds, except for the Emerging Markets Equity Index Fund, may invest in mortgage-related securities. Mortgage-related securities represent an interest in a pool of, or are secured by, mortgage loans. Mortgage-related securities may be issued or guaranteed by (i) U.S. Government agencies or instrumentalities such as GNMA, FNMA and FHLMC or (ii) other issuers, including private companies.

Stripped mortgage-related securities are usually structured with two classes that receive different portions of the interest and principal distributions on a pool of mortgage loans. The yield to maturity on an interest only or “IO” class of stripped mortgage-related securities is extremely sensitive not only to changes in prevailing interest rates but also to the rate of principal payments (including prepayments) on the underlying assets. A rapid rate of principal prepayments may have a measurable adverse effect on a Fund's yield to maturity to the extent it invests in IOs. If the assets underlying the IO experience greater than anticipated prepayments of principal, the Fund may fail to recoup fully, or at all, its initial investment in these securities. Conversely, principal only securities or “POs” tend to increase in value if prepayments are greater than anticipated and decline if prepayments are slower than anticipated. The secondary market for stripped mortgage-related securities may be more volatile and less liquid than that for other mortgage-related securities, potentially limiting a Fund's ability to buy or sell those securities at any particular time.

Municipal and Municipal-Related Securities

and include industrial development bonds and private activity bonds. Tax anticipation notes are issued to finance working capital needs of municipalities and are generally issued in anticipation of future tax revenues. Bond anticipation notes are issued in expectation of the issuer obtaining longer-term financing.

Options

The Funds may purchase and sell put and call options to enhance investment performance and to protect against changes in market prices. There is no assurance that a Fund's use of put and call options will achieve its desired objective, and a Fund's use of options may result in losses to the Fund. A Fund may write covered call options or uncovered call options.

Covered call options. A Fund may write (i.e., sell) covered call options to realize a greater current return through the receipt of premiums than it would realize on its securities alone. Such option transactions may also be used as a limited form of hedging against a decline in the price of securities owned by a Fund.

A call option gives the holder the right to purchase, and obligates the writer to sell, a security at the exercise price at any time before the expiration date. A call option is “covered” if the writer, at all times while obligated as a writer, either owns the underlying securities (or comparable securities satisfying the cover requirements of the securities exchanges), or has the right to acquire such securities through immediate conversion of securities.

A Fund will receive a premium from writing a call option, which increases the Fund's return on the underlying security in the event the option expires unexercised or is closed out at a profit. The amount of the premium reflects, among other things, the relationship between the exercise price and the current market value of the underlying security, the volatility of the underlying security, the amount of time remaining until expiration, current interest rates, and the effect of supply and demand in the options market and in the market for the underlying security.

In return for the premium received when it writes a covered call option, a Fund gives up some or all of the opportunity to profit from an increase in the market price of the securities covering the call option during the life of the option. A Fund retains the risk of loss should the price of such securities decline. If the option expires unexercised, a Fund realizes a gain equal to the premium, which may be offset by a decline in price of the underlying security. If the option is exercised, a Fund realizes a gain or loss equal to the difference between the Fund's cost for the underlying security and the proceeds of sale (exercise price minus commissions) plus the amount of the premium.

A Fund may terminate a call option that it has written before it expires by entering into a closing purchase transaction. A Fund may enter into closing purchase transactions in order to free itself to sell the underlying security or to write another call on the security, realize a profit on a previously written call option, or protect a security from being called in an unexpected market rise. Any profits from a closing purchase transaction may be offset by a decline in the value of the underlying security. Conversely, because increases in the market price of a call option will generally reflect increases in the market price of the underlying security, any loss resulting from a closing purchase transaction is likely to be offset in whole or in part by unrealized appreciation of the underlying security owned by a Fund.

Uncovered call options. Writing uncovered call options may enable a Fund to realize income without committing capital to the ownership of the underlying securities or instruments, however writing uncovered calls are riskier than writing covered calls because there is no underlying security held by a Fund that can act as a partial hedge. When a Fund has written an uncovered call option, the Fund will not necessarily hold securities offsetting the risk to the Fund. As a result of writing a call option without holding the underlying the securities, if the call option were exercised, a Fund might be required to purchase the security that is the subject of the call at the market price at the time of exercise. The Fund's exposure on such an option is theoretically unlimited. There is also a risk, especially with less liquid preferred and debt securities, that the security may not be available for purchase. Uncovered calls have speculative characteristics.

Covered put options. A Fund may write covered put options in order to enhance its current return. Such options transactions may also be used as a limited form of hedging against an increase in the price of securities that the Fund plans to purchase. A put option gives the holder the right to sell, and obligates the writer to buy, a security at the exercise price at any time before the expiration date. A put option may be “covered” if the writer earmarks or otherwise segregates liquid assets equal to the price to be paid if the option is exercised minus margin on deposit.

By writing a put option, a Fund assumes the risk that it may be required to purchase the underlying security for an exercise price higher than its then current market value, resulting in a potential capital loss unless the security later appreciates in value.

A Fund may terminate a put option that it has written before it expires by entering into a closing purchase transaction. Any loss from this transaction may be partially or entirely offset by the premium received on the terminated option.

Purchasing put and call options. A Fund may also purchase put options to protect portfolio holdings against a decline in market value. This protection lasts for the life of the put option because a Fund, as a holder of the option, may sell the underlying security at the exercise price regardless of any decline in its market price. In order for a put option to be profitable, the market price of the underlying security must decline sufficiently below the exercise price to cover the premium and transaction costs that a Fund must pay. These costs will reduce any profit the Fund might have realized had it sold the underlying security instead of buying the put option.

A Fund may purchase call options to hedge against an increase in the price of securities that the Fund wants ultimately to buy. Such hedge protection is provided during the life of the call option since a Fund, as holder of the call option, is able to buy the underlying security at the exercise price regardless of any increase in the underlying security's market price. In order for a call option to be profitable, the market price of the underlying security must rise sufficiently above the exercise price to cover the premium and transaction costs. These costs will reduce any profit a Fund might have realized had it bought the underlying security at the time it purchased the call option.

A Fund may also purchase put and call options to attempt to enhance its current return.

Options on foreign securities. A Fund may purchase and sell options on foreign securities if the Adviser believes that the investment characteristics of such options, including the risks of investing in such options, are consistent with the Fund's investment objective. It is expected that risks related to such options will not differ materially from risks related to options on U.S. securities. However, position limits and other rules of foreign exchanges may differ from those in the United States. In addition, options markets in some countries, many of which are relatively new, may be less liquid than comparable markets in the United States.

Options on securities indices. A Fund may write or purchase options on securities indices. Index options are similar to options on individual securities in that the purchaser of an index option acquires the right to buy (in the case of a call) or sell (in the case of a put), and the writer undertakes the obligation to sell or buy (as the case may be), units of an index at a stated exercise price during the term of the option. Instead of the right to take or make actual delivery of securities, the holder of an index option has the right to receive a cash “exercise settlement amount.” This amount is equal to the amount by which the fixed exercise price of the option exceeds (in the case of a put) or is less than (in the case of a call) the closing value of the underlying index on the date of the exercise, multiplied by a fixed “index multiplier.”

Price movements in securities which a Fund owns or intends to purchase probably will not correlate perfectly with movements in the level of a securities index and, therefore, if the Fund uses an option for hedging purposes, it bears the risk of a loss on a securities index option which is not completely offset by movements in the price of such securities. Because securities index options are settled in cash, a call writer cannot determine the amount of its settlement obligations in advance and, unlike call writing on a specific security, cannot provide in advance for, or cover, its potential settlement obligations by acquiring and holding underlying securities. A Fund may, however, cover call options written on a securities index by holding a mix of securities which substantially replicate the movement of the index or by holding a call option on the securities index with an exercise price no higher than the call option sold.

Compared to the purchase or sale of futures contracts, the purchase of call or put options on an index involves less potential risk to a Fund because the maximum amount at risk is the premium paid for the options plus transactions costs. The writing of a put or call option on an index involves risks similar to those risks relating to the purchase or sale of index futures contracts.

Risks involved in the use of options. The successful use of a Fund's options strategies depends on the ability of the Adviser to forecast correctly interest rate and market movements. For example, if a Fund were to write a call option based on the Adviser's expectation that the price of the underlying security would fall, but the price were to rise instead, the Fund could be required to sell the security upon exercise at a price below the current market price. Similarly, if a Fund were to write a put option based on the Adviser's expectation that the price of the underlying security would rise, but the price were to fall instead, the Fund could be required to purchase the security upon exercise at a price higher than the current market price.

When a Fund purchases an option, it runs the risk that it will lose its entire investment in the option in a relatively short period of time, unless the Fund exercises the option or enters into a closing sale transaction before the option's expiration. If the price of the underlying security does not rise (in the case of a call) or fall (in the case of a put) to an extent sufficient to cover the option premium and transaction costs, a Fund will lose part or all of its investment in the option. This contrasts with an investment by a Fund in the underlying security, since the Fund will not realize a loss if the security's price does not change.

The effective use of options also depends on a Fund's ability to terminate option positions at times when the Adviser deems it desirable to do so. There is no assurance that a Fund will be able to effect closing transactions at any particular time or at an acceptable price.

If a secondary market in options were to become unavailable, a Fund could no longer engage in closing transactions. Lack of investor interest might adversely affect the liquidity of the market for particular options or series of options. A market may discontinue trading of a particular option or options generally. In addition, a market could become temporarily unavailable if unusual events — such as volume in excess of trading or clearing capability — were to interrupt its normal operations.

A market may at times find it necessary to impose restrictions on particular types of options transactions, such as opening transactions. For example, if an underlying security ceases to meet qualifications imposed by the market or the Options Clearing Corporation, new series of options on that security will no longer be opened to replace expiring series, and opening transactions in existing series may be prohibited. If an options market were to become unavailable, a Fund as a holder of an option would be able to realize profits or limit losses only by exercising the option, and the Fund, as option writer, would remain obligated under the option until expiration or exercise.

Disruptions in the markets for the securities underlying options purchased or sold by a Fund could result in losses on the options. If trading is interrupted in an underlying security, the trading of options on that security is normally halted as well. As a result, a Fund as purchaser or writer of an option will be unable to close out its positions until options trading resumes, and it may be faced with considerable losses if trading in the security reopens at a substantially different price. In addition, the Options Clearing Corporation or options markets may impose exercise restrictions. If a prohibition on exercise is imposed at the time when trading in the option has also been halted, a Fund as purchaser or writer of an option will be locked into its position until one of the two restrictions has been lifted. If the Options Clearing Corporation were to determine that the available supply of an underlying security appears insufficient to permit delivery by the writers of all outstanding calls in the event of exercise, it may prohibit indefinitely the exercise of put options. A Fund, as holder of such a put option, could lose its entire investment if the prohibition remained in effect until the put option's expiration.

Foreign-traded options are subject to many of the same risks presented by internationally-traded securities. In addition, because of time differences between the United States and various foreign countries, and because different holidays are observed in different countries, foreign options markets may be open for trading during hours or on days when U.S. markets are closed. As a result, option premiums may not reflect the current prices of the underlying interest in the United States.

Over-the-counter (“OTC”) options purchased by a Fund and assets held to cover OTC options written by the Fund may, under certain circumstances, be considered illiquid securities for purposes of any limitation on the Fund's ability to invest in illiquid securities.

Other Asset-Backed Securities

In addition to the mortgage related securities discussed above, the Funds may invest in asset-backed securities that are not mortgage-related. Asset-backed securities other than mortgage-related securities represent undivided fractional interests in pools of instruments, such as consumer loans, and are typically similar in structure to mortgage-related pass-through securities. Payments of principal and interest are passed through to holders of the securities and are typically supported by some form of credit enhancement, such as a letter of credit, surety bond, limited guarantee by another entity, or by priority to certain of the borrower's other securities. The degree of credit-enhancement, if any, varies, applying only until exhausted and generally covering only a fraction of the security's par value.

The value of such asset-backed securities is affected by changes in the market's perception of the asset backing the security, changes in the creditworthiness of the servicing agent for the instrument pool, the originator of the instruments, or the financial institution providing any credit enhancement and the expenditure of any portion of any credit enhancement. The risks of investing in asset-backed securities are ultimately dependent upon payment of the underlying instruments by the obligors, and a Fund would generally have no recourse against the obligee of the instruments in the event of default by an obligor. The underlying instruments are subject to prepayments which shorten the duration of asset-backed securities and may lower their return, in generally the same manner as described above for prepayments of pools of mortgage loans underlying mortgage-related securities. During periods of deteriorating economic conditions, such as recessions or periods of rising unemployment, delinquencies and losses generally increase, sometimes dramatically, with respect to securitizations involving loans, sales contracts, receivables and other obligations underlying asset-backed securities.

Pre-Refunded Municipal Securities

Private Placements and Restricted Securities

Each Fund may invest in securities that are purchased in private placements and, accordingly, are subject to restrictions on resale as a matter of contract or under federal securities laws. While such private placements may offer attractive opportunities for investment not otherwise available on the open market, the securities so purchased are often “restricted securities,” i.e., securities which cannot be sold to the public without registration under the Securities Act of 1933 (the “Securities Act”) or the availability of an exemption from registration (such as Rules 144 or 144A), or which are not readily marketable because they are subject to other legal or contractual delays in or restrictions on resale. Generally speaking, restricted securities may be sold only to qualified institutional buyers, or in a privately negotiated transaction to a limited number of purchasers, or in limited quantities after they have been held for a specified period of time and other conditions are met pursuant to an exemption from registration, or in a public offering for which a registration statement is in effect under the Securities Act.

Because there may be relatively few potential purchasers for such investments, especially under adverse market or economic conditions or in the event of adverse changes in the financial condition of the issuer, the Fund could find it more difficult to sell such securities when the Adviser believes it advisable to do so or may be able to sell such securities only at prices lower than if such securities were more widely held. Market quotations for such securities are generally less readily available than for publicly traded securities. The absence of a trading market can make it difficult to ascertain a market value for such securities for purposes of computing the Fund's net asset value, and the judgment of the Adviser may at times play a greater role in valuing these securities than in the case of publicly traded securities. Disposing of such securities, which may be illiquid investments, can involve time-consuming negotiation and legal expenses, and it may be difficult or impossible for the Fund to sell them promptly at an acceptable price. The Fund may have to bear the extra expense of registering such securities for resale and the risk of substantial delay in effecting such registration.

A Fund may be deemed to be an “underwriter” for purposes of the Securities Act when selling restricted securities to the public, and in such event the Fund may be liable to purchasers of such securities if the registration statement prepared by the issuer, or the prospectus forming a part of it, is materially inaccurate or misleading.

Purchase of Other Investment Company Shares

The Funds may, to the extent permitted under the 1940 Act and the rules thereunder, invest in shares of other investment companies, which include funds managed by SSGA FM, which invest exclusively in money market instruments or in investment companies with investment policies and objectives which are substantially similar to those of the Funds. These investments may be made temporarily, for example, to invest uncommitted cash balances or, in limited circumstances, to assist in meeting shareholder redemptions, or as long-term investments. In general, the 1940 Act prohibits a Fund from acquiring more than 3% of the voting shares of any one other investment company, and prohibits a Fund investing more than 5% of its total assets in the securities of any one other investment company or more than 10% of its total assets in securities of other investment companies in the aggregate. The percentage limitations above apply to investments in any investment company. Pursuant to rules adopted by the SEC, the Funds may invest in excess of these limitations if the Fund and the investment company in which the Fund would like to invest comply with certain conditions. Certain of the conditions do not apply if the Fund is investing in shares issued by affiliated funds. In addition, the Funds may invest in shares issued by money market funds, including certain unregistered money market funds, in excess of the limitations. The Funds' investments in another investment company will be subject to the risks of the purchased investment company's portfolio securities. The Funds' shareholders must bear not only their proportionate share of the Funds' fees and expenses, but they also must bear indirectly the fees and expenses of the other investment company.

Real Estate Investment Trusts (“REITs”)

Each Fund may invest in REITs. REITs pool investors' funds for investment primarily in income producing real estate or real estate loans or interests. A REIT is not taxed on income distributed to shareholders if it complies with several requirements relating to its organization, ownership, assets, and income and a requirement that it distribute to its shareholders at least 90% of its taxable income (other than net capital gains) for each taxable year. REITs can generally be classified as Equity REITs, Mortgage REITs and Hybrid REITs. Equity REITs, which invest the majority of their assets directly in real property, derive their income primarily from rents. Equity REITs can also realize capital gains by selling

properties that have appreciated in value. Mortgage REITs, which invest the majority of their assets in real estate mortgages, derive their income primarily from interest payments. Hybrid REITs combine the characteristics of both Equity REITs and Mortgage REITs. A Fund will not invest in real estate directly, but only in securities issued by real estate companies. However, a Fund may be subject to risks similar to those associated with the direct ownership of real estate (in addition to securities markets risks) because of its policy of concentration in the securities of companies in the real estate industry. These include declines in the value of real estate, risks related to general and local economic conditions, dependency on management skill, heavy cash flow dependency, possible lack of availability of mortgage funds, overbuilding, extended vacancies of properties, increased competition, increases in property taxes and operating expenses, changes in zoning laws, losses due to costs resulting from the clean-up of environmental problems, liability to third-parties for damages resulting from environmental problems, casualty or condemnation losses, limitations on rents, changes in neighborhood values, the appeal of properties to tenants and changes in interest rates. Investments in REITs may subject Fund shareholders to duplicate management and administrative fees.

In addition to these risks, Equity REITs may be affected by changes in the value of the underlying property owned by the trusts, while Mortgage REITs may be affected by the quality of any credit extended. Further, Equity and Mortgage REITs are dependent upon management skills and generally may not be diversified. Equity and Mortgage REITs are also subject to heavy cash flow dependency, defaults by borrowers and self-liquidation. In addition, if applicable, Equity and Mortgage REITs could possibly fail to qualify for the favorable tax treatment available to REITs under the Code, or to maintain their exemptions from registration under the 1940 Act. The above factors may also adversely affect a borrower's or a lessee's ability to meet its obligations to the REIT. In the event of a default by a borrower or lessee, the REIT may experience delays in enforcing its rights as a mortgagee or lessor and may incur substantial costs associated with protecting investments.

Repurchase Agreements

The Funds may enter into repurchase agreements with banks, other financial institutions, such as broker-dealers, and other institutional counterparties. Under a repurchase agreement, a Fund purchases securities from a financial institution that agrees to repurchase the securities at the Fund's original purchase price plus interest within a specified time. A Fund will limit repurchase transactions to those member banks of the Federal Reserve System, broker-dealers and other financial institutions whose creditworthiness the Adviser considers satisfactory. Should the counterparty to a transaction fail financially, the Fund may encounter delay and incur costs before being able to sell the securities, or may be prevented from realizing on the securities. Further, the amount realized upon the sale of the securities may be less than that necessary to fully compensate the Fund. The SEC has finalized new rules requiring the central clearing of certain repurchase transactions involving U.S. Treasuries. Historically, such transactions have not been required to be cleared and voluntary clearing of such transactions has generally been limited. The new clearing requirements could make it more difficult for a Fund to execute certain investment strategies. See “Risks Associated with Derivatives Regulation” for additional information.

Reverse Repurchase Agreements

The Funds may enter into reverse repurchase agreements, which are a form of borrowing. Under reverse repurchase agreements, a Fund transfers possession of portfolio securities to financial institutions in return for cash in an amount equal to a percentage of the portfolio securities' market value and agrees to repurchase the securities at a future date by repaying the cash with interest. Each Fund retains the right to receive interest and principal payments from the securities. Reverse repurchase agreements involve the risk that the market value of securities sold by a Fund may decline below the price at which it is obligated to repurchase the securities. Reverse repurchase agreements involve the risk that the buyer of the securities sold might be unable to deliver them when a Fund seeks to repurchase the securities. If the buyer files for bankruptcy or becomes insolvent, a Fund may be delayed or prevented from recovering the security that it sold. The SEC has finalized new rules requiring the central clearing of certain repurchase transactions involving U.S. Treasuries. Historically, such transactions have not been required to be cleared and voluntary clearing of such transactions has generally been limited. The new clearing requirements could make it more difficult for a Fund to execute certain investment strategies. See “Risks Associated with Derivatives Regulation” for additional information.

Special Risk Considerations of Investing in China.

Certain Funds may invest in securities of Chinese issuers. Investing in securities of Chinese issuers, including by investing in A Shares, involves certain risks and considerations not typically associated with investing in securities of U.S. issuers, including, among others, (i) more frequent (and potentially widespread) trading suspensions and U.S. or foreign government interventions or restrictions with respect to Chinese issuers, which could preclude the Fund from making

certain investments or result in the Fund selling investments at disadvantageous times and which may also cause reduced liquidity and increased price volatility in such investments, (ii) currency revaluations and other currency exchange rate fluctuations or blockage, (iii) the nature and extent of intervention by the Chinese government in the Chinese securities markets, whether such intervention will continue and the impact of such intervention or its discontinuation, (iv) the risk of nationalization or expropriation of assets, (v) the risk that the Chinese government may decide not to continue to support economic reform programs, (vi) limitations on the use of brokers, (vii) potentially higher rates of inflation, (viii) the unavailability of consistently-reliable economic data, (ix) the relatively small size and absence of operating history of many Chinese companies, (x) accounting, auditing and financial reporting standards in China are different from U.S. standards and, therefore, disclosure of certain material information may not be available, (xi) greater political, economic, social, legal and tax-related uncertainty, (xii) higher market volatility caused by any potential regional territorial conflicts or natural disasters, (xiii) higher dependence on exports and international trade, (xiv) the risk of increased trade tariffs, sanctions, embargoes and other trade limitations, (xv) restrictions on foreign ownership, (xvi) risks associated with variable interest entity (“VIE”) structures, and (xvii) custody risks associated with investing through programs to access Chinese securities. Significant portions of the Chinese securities markets may become rapidly illiquid, as Chinese issuers have the ability to suspend the trading of their equity securities, and have shown a willingness to exercise that option in response to market volatility and other events. The liquidity of Chinese securities may shrink or disappear suddenly and without warning as a result of adverse economic, market or political events, or adverse investor perceptions, whether or not accurate.

Certain Funds may also gain investment exposure to Chinese companies through VIE structures. Such investments are subject to the investment risks associated with the Chinese-based company. The VIE structure enables foreign investors, such as the Funds, to obtain investment exposure to a Chinese company in situations in which the Chinese government has prohibited or limited non-Chinese ownership of such company. The VIE structure does not involve direct equity ownership in a China-based company, but rather involves claims to the China-based company's profits and control of the assets that belong to the China-based company through contractual arrangements. The contractual arrangements in place with the China-based company provide limited ability for the VIE to exercise control over the China-based company and the China-based company's actions may negatively impact the investment value of the VIE. Control over a VIE may also be jeopardized if a natural person who holds the equity interest in the VIE breaches the terms of the contractual arrangements, is subject to legal proceedings, or if any physical instruments such as chops and seals are used without authorization.

Intervention by the Chinese government with respect to the VIE structure could significantly affect the Chinese operating company's performance and thus, the value of a Fund's investment through a VIE structure, as well as the enforceability of the contractual arrangements of the VIE structure. In the event of such an occurrence, a Fund, as a foreign investor, may have little or no legal recourse. If the Chinese government were to determine that the contractual arrangements establishing the VIE structure did not comply with Chinese law or regulations, the Chinese operating company could be subject to penalties, revocation of its business and operating license, or forfeiture of ownership interests. In addition to the risk of government intervention, investments through a VIE structure are subject to the risk that the China-based company (or its officers, directors, or Chinese equity owners) may breach the contractual arrangements, or Chinese law changes in a way that adversely affects the enforceability of the arrangements, or the contracts are otherwise not enforceable under Chinese law, in which case a Fund may suffer significant losses on its investments through a VIE structure with little or no recourse available.

In addition, unexpected political, regulatory and diplomatic events, such as the U.S.-China “trade war” that intensified in 2018, may affect investor and consumer confidence and may adversely impact financial markets and the broader economy, perhaps suddenly and to a significant degree. The current political climate and the renewal or escalation of a trade war between China and the United States may have an adverse effect on both the U.S. and Chinese economies, including as the result of one country's imposition of tariffs on the other country's products. In addition, sanctions or other investment restrictions could preclude a Fund from investing in certain Chinese issuers or cause a Fund to sell investments at disadvantageous times. Events such as these and their impact on the Funds are difficult to predict and it is unclear whether further tariffs may be imposed or other escalating actions may be taken in the future.

Moreover, the Chinese government is involved in a longstanding dispute with Taiwan that has included threats of invasion. If the political climate between the U.S. and China does not improve or continues to deteriorate, if China were to attempt unification of Taiwan by force, or if other geopolitical conflicts develop or get worse, economies, markets, and individual securities may be severely affected both regionally and globally, and the value of the Fund's assets may go down.

Total Return Swaps, Equity Swaps and Interest Rate Swaps

The Funds may contract with a counterparty to pay a stream of cash flows and receive the total return of an index or a security for purposes of attempting to obtain a particular desired return at a lower cost to a Fund than if the Fund had invested directly in an instrument that yielded that desired return. A Fund's return on a swap will depend on the ability of its counterparty to perform its obligations under the swap. The Adviser will cause a Fund to enter into swap agreements only with counterparties that would be eligible for consideration as repurchase agreement counterparties under the Fund's repurchase agreement guidelines.

The Funds may enter into interest rate swap transactions with respect to any security they are entitled to hold. Interest rate swaps involve the exchange by a Fund with another party of their respective rights to receive interest, e.g., an exchange of floating rate payments for fixed rate payments. The Funds expect to enter into these transactions primarily to preserve a return or spread on a particular investment or portion of its portfolio or to protect against any increase in the price of securities it anticipates purchasing at a later date. The Funds generally intend to use these transactions as a hedge and not as a speculative investment. For example, a Fund may enter into an interest rate swap in order to protect against declines in the value of fixed income securities held by the Funds. In such an instance, the Fund may agree with a counterparty to pay a fixed rate (multiplied by a notional amount) and the counterparty to pay a floating rate multiplied by the same notional amount. If interest rates rise, resulting in a diminution in the value of a Fund, the Fund would receive payments under the swap that would offset, in whole or in part, such diminution in value; if interest rates fall, the Fund would likely lose money on the swap transaction.

Treasury Inflation-Protected Securities

The Funds may invest in Inflation-Protection Securities (“TIPSs”), a type of inflation-indexed Treasury security. TIPSs typically provide for semiannual payments of interest and a payment of principal at maturity. In general, each payment will be adjusted to take into account any inflation or deflation that occurs between the issue date of the security and the payment date based on the Consumer Price Index for All Urban Consumers (“CPI-U”).

U.S. Government Securities

The Funds may purchase U.S. Government securities. The types of U.S. Government obligations in which the Funds may at times invest include: (1) U.S. Treasury obligations and (2) obligations issued or guaranteed by U.S. Government agencies and instrumentalities which are supported by any of the following: (a) the full faith and credit of the U.S. Treasury, (b) the right of the issuer to borrow an amount limited to a specific line of credit from the U.S. Treasury, (c) discretionary authority of the U.S. Government agency or instrumentality, or (d) the credit of the instrumentality (examples of agencies and instrumentalities are: Federal Land Banks, Federal Housing Administration, Federal Farm Credit Bank, Farmers Home Administration, Export-Import Bank of the United States, Central Bank for Cooperatives, Federal Intermediate Credit Banks, Federal Home Loan Banks, General Services Administration, Maritime Administration, Tennessee Development Bank, Asian-American Development Bank, International Bank for Reconstruction and Development and Federal National Mortgage Association). No assurance can be given that in the future the U.S. Government will provide financial support to U.S. Government securities it is not obligated to support.

U.S. Registered Securities of Non-U.S. Issuers

The Funds may purchase publicly traded common stocks of non-U.S. corporations.

less governmental regulation than U.S. issuers. Moreover, individual non-U.S. economies may differ favorably or unfavorably from the U.S. economy in such respects as growth of gross domestic product, rate of inflation, capital reinvestment, resource self-sufficiency and balance of payment positions.

A Fund's investment in common stock of non-U.S. corporations may also be in the form of American Depositary Receipts (“ADRs”), Global Depositary Receipts (“GDRs”) and European Depositary Receipts (“EDRs”) (collectively “Depositary Receipts”). Depositary Receipts are receipts, typically issued by a bank or trust company, which evidence ownership of underlying securities issued by a non-U.S. corporation. For ADRs, the depository is typically a U.S. financial institution and the underlying securities are issued by a non-U.S. issuer. For other Depositary Receipts, the depository may be a non-U.S. or a U.S. entity, and the underlying securities may have a non-U.S. or a U.S. issuer. Depositary Receipts will not necessarily be denominated in the same currency as their underlying securities. Generally, ADRs, in registered form, are designed for use in the U.S. securities markets, and EDRs, in bearer form, are designated for use in European securities markets. GDRs are tradable both in the United States and in Europe and are designed for use throughout the world. A Fund may invest in unsponsored Depositary Receipts. The issuers of unsponsored Depositary Receipts are not obligated to disclose material information in the United States, and, therefore, there may be less information available regarding such issuers and there may not be a correlation between such information and the market value of the Depositary Receipts.

Variable Amount Master Demand Notes

The Funds may invest in variable amount master demand notes which are unsecured obligations that are redeemable upon demand and are typically unrated. These instruments are issued pursuant to written agreements between their issuers and holders. The agreements permit the holders to increase (subject to an agreed maximum) and the holders and issuers to decrease the principal amount of the notes, and specify that the rate of interest payable on the principal fluctuates according to an agreed formula. Generally, changes in interest rates will have a smaller effect on the market value of these securities than on the market value of comparable fixed income obligations. Thus, investing in these securities generally allows less opportunity for capital appreciation and depreciation than investing in comparable fixed income securities. There may be no active secondary market with respect to a particular variable rate instrument.

Variable and Floating Rate Securities

The Funds may invest in variable and floating rate securities. In general, variable rate securities are instruments issued or guaranteed by entities such as (1) U.S. Government, or an agency or instrumentality thereof, (2) corporations, (3) financial institutions, (4) insurance companies or (5) trusts that have a rate of interest subject to adjustment at regular intervals but less frequently than annually. A variable rate security provides for the automatic establishment of a new interest rate on set dates. Interest rates on these securities are ordinarily tied to, widely recognized market rates, which are typically set once a day. These rates may change as often as twice daily. Generally, changes in interest rates will have a smaller effect on the market value of variable and floating rate securities than on the market value of comparable fixed income obligations. Variable rate obligations will be deemed to have a maturity equal to the period remaining until the next readjustment of the interest rate.

When-Issued, Delayed Delivery and Forward Commitment Transactions

To secure an advantageous price or yield, certain Funds may purchase securities on a when-issued, delayed delivery, to-be-announced (“TBA”) or forward commitment basis and may sell securities on a forward commitment or delayed delivery basis. A Fund will enter into when-issued, delayed delivery, TBA or forward commitment transactions for the purpose of acquiring securities and not for the purpose of leverage.

When purchasing a security on a when-issued, delayed delivery, TBA or forward commitment basis, a Fund assumes the rights and risks of ownership of the security, including the risk of price and yield fluctuations, and takes such fluctuations into account when determining its NAV. When such transactions are negotiated, certain terms may be fixed at the time the commitment is made, but delivery and payment for the securities takes place at a later date. In general, a Fund does not pay for the securities until received and does not start earning interest or other income until the contractual settlement date. A Fund may take delivery of the securities or it may sell the securities before the settlement date.

At the time of delivery of the securities, the value may be more or less than the purchase or sale price. If a Fund remains substantially fully invested at a time when when-issued, delayed delivery, TBA or forward commitment purchases are outstanding, the purchases may result in a form of leverage and give rise to increased volatility of the Fund's NAV. Default by, or bankruptcy of, a counterparty to a when-issued, delayed delivery, TBA or forward commitment transaction would

expose the Fund to possible losses because of an adverse market action, expenses or delays in connection with the purchase or sale of the pools specified in such transaction. Purchases of when-issued, delayed delivery, TBA or forward commitment securities also involve a risk of loss if the seller fails to deliver after the value of the securities has risen.

A TBA transaction involves a commitment to purchase securities sold for a fixed price where the underlying securities are announced at a future date. The seller does not specify the particular securities to be delivered. Instead, a Fund agrees to accept any security that meets specified terms. For example, in a TBA mortgage-backed security transaction, a Fund and the seller would agree upon the issuer, interest rate and terms of the underlying mortgages. The seller would not identify the specific underlying mortgages until it issues the security. For this reason, in a TBA transaction, a Fund commits to purchase securities for which all specific information is not yet known at the time of the trade, particularly the exact face amount in forward commitment mortgage-backed securities transactions. The purchaser in a TBA transaction generally is subject to increased market risk and interest rate risk because the delivered securities may be less favorable than anticipated by the purchaser.

Certain Funds may also enter into a forward commitment to sell securities it owns. The use of forward commitments enables a Fund to hedge against anticipated changes in interest rates and prices. In a forward sale, a Fund does not participate in gains or losses on the security occurring after the commitment date. Forward commitments to sell securities also involve a risk of loss if the seller fails to take delivery after the value of the securities has declined. Forward commitment transactions involve additional risks similar to those associated with investments in options and futures contracts.

Recently effective rule amendments by the Financial Industry Regulatory Authority, Inc. (“FINRA”) impose mandatory margin requirements for “Covered Agency Transactions,” which include TBA Transactions, certain transactions in pass-through mortgage-backed securities or small-business administration-backed asset-backed securities and transactions in CMOs, in each case where such transactions have delayed contractual settlement dates of a specified period. There are limited exceptions to these margin requirements. Covered Agency Transactions historically have not been required to be collateralized. The collateralization of Covered Agency Transactions is intended to mitigate counterparty credit risk between trade and settlement, but could increase the cost of such transactions and impose added operational complexity.

Zero-Coupon Securities

The Funds may invest in zero-coupon securities. Zero-coupon securities are notes, bonds and debentures that: (1) do not pay current interest and are issued at a substantial discount from par value; (2) have been stripped of their unmatured interest coupons and receipts; or (3) pay no interest until a stated date one or more years into the future. These securities also include certificates representing interests in such stripped coupons and receipts. Generally, changes in interest rates will have a greater impact on the market value of a zero-coupon security than on the market value of the comparable securities that pay interest periodically during the life of the instrument. In the case of any zero-coupon debt obligations with a fixed maturity date of more than one year from the date of issuance that are treated as issued originally at a discount, a Fund (or a Portfolio or Underlying Fund, as applicable) will be required to accrue original issue discount (“OID”) for U.S. federal income tax purposes and may as a result be required to pay out as an income distribution an amount which is greater than the total amount of cash interest the Fund actually received. To generate sufficient cash to make the requisite distributions to maintain its qualification for treatment as a RIC, a Fund (or a Portfolio or Underlying Fund, as applicable) may be required to sell investments, including at a time when it may not be advantageous to do so.

Privately-issued stripped securities are not themselves guaranteed by the U.S. Government, but the future payment of principal or interest on U.S. Treasury obligations which they represent is so guaranteed.

Master/Feeder Structure

The Emerging Markets Equity Index Fund, the Hedged International Developed Equity Index Fund and the Target Retirement Funds may in the future determine to become a “feeder” fund that invests all of its assets in another open-end investment company (a “master fund”) that has substantially similar investment strategies as the Fund. This structure is sometimes called a “master/feeder” structure.

Fundamental Investment Restrictions

The Portfolios in which the Feeder Funds invest each have substantially the same investment restrictions as their corresponding Funds. In reviewing the description of a Feeder Fund's investment restrictions below, you should assume that the investment restrictions of the corresponding Portfolio are the same in all material respects as those of the Feeder Fund.

The Trust has adopted the following fundamental investment restrictions with respect to the Funds, which may not be changed without the affirmative vote of a “majority of the outstanding voting securities” of a Fund, which is defined in the 1940 Act to mean the affirmative vote of the lesser of (1) more than 50% of the outstanding shares of the Fund and (2) 67% or more of the shares present at a meeting if more than 50% of the outstanding shares are present at the meeting in person or by proxy.

A Fund may borrow money and issue senior securities to the extent consistent with applicable law from time to time.

A Fund may make loans, including to affiliated investment companies, to the extent consistent with applicable law from time to time.

A Fund may purchase or sell commodities to the extent consistent with applicable law from time to time.

A Fund may purchase, sell or hold real estate to the extent consistent with applicable law from time to time.

A Fund may underwrite securities to the extent consistent with applicable law from time to time.

For the State Street Aggregate Bond Index Fund, the Emerging Markets Equity Index Fund, the State Street Equity 500 Index Fund, State Street Global All Cap Equity ex-U.S. Index Fund, the Hedged International Developed Equity Index Fund, the International Developed Equity Index Fund and the Small/Mid Cap Equity Index Fund:

For the Target Retirement Funds:

For purposes of the above investment limitation number 6, in the case of a tax-exempt bond issued by a non-governmental user, where the tax-exempt bond is backed only by the assets and revenues of the non-governmental user, then such non-governmental user would be deemed to be the sole issuer. For each Fund, all percentage limitations (except the limitation to borrowings) on investments will apply at the time of the making of an investment and shall not be considered violated unless an excess or deficiency occurs or exists immediately after and as a result of such investment. Except for the investment restrictions expressly identified as fundamental, or to the extent designated as such in the Prospectus with respect to a Fund, the other investment policies described in this SAI or in the Prospectus are not fundamental and may be changed by approval of the Trustees without shareholder approval.

Names Rule Policy

To the extent a Fund is subject to Rule 35d-1 under the 1940 Act, the Fund has an investment policy, described in the Fund's prospectus, to, under normal circumstances, invest at least 80% of its assets in the particular types of investments suggested by the Fund's name (a “Name Policy”). “Assets” for the purposes of a Name Policy are net assets plus the amount of any borrowings for investment purposes. The percentage limitation applies at the time of purchase of an investment. A Fund's Name Policy may be changed by the Board of Trustees without shareholder approval. However, to the extent required by SEC regulations, shareholders will be provided with at least sixty (60) days' notice prior to any change in a Fund's Name Policy.

Additional Information

Fundamental Investment Restrictions (1) through (5), as numbered above limit a Fund's ability to engage in certain investment practices and purchase securities or other instruments to the extent consistent with applicable law as that law changes from time to time. Applicable law includes the 1940 Act, the rules or regulations thereunder and applicable orders of the SEC as are currently in place. In addition, interpretations and guidance provided by the SEC staff may be taken into account, where deemed appropriate by a Fund, to determine if an investment practice or the purchase of securities or other instruments is permitted by applicable law. As such, the effects of these limitations will change as the statute, rules, regulations or orders (or, if applicable, interpretations) change, and no shareholder vote will be required or sought when such changes permit or require a resulting change in practice.

Additional Strategy Information

For the Target Retirement Funds (subject to each Fund's respective glide path allocations):

•With respect to Target Retirement 2025 Fund (the “2025 Fund”), at least 35% of the 2025 Fund's assets will be invested in underlying equity funds that each invest at least 80% of their respective assets in public equity securities included in such underlying equity fund's index, and at least 8% of the 2025 Fund's assets will be invested in underlying government securities index funds that each invest at least 80% of their respective assets in government securities included in such underlying government fund's index.

•With respect to Target Retirement 2030 Fund (the “2030 Fund”), at least 45% of the 2030 Fund's assets will be invested in underlying equity funds that each invest at least 80% of their respective assets in public equity securities included in such underlying equity fund's index, and at least 6% of the 2030 Fund's assets will be invested in underlying government securities index funds that each invest at least 80% of their respective assets in government securities included in such underlying government fund's index.

•With respect to Target Retirement 2035 Fund (the “2035 Fund”), at least 55% of the 2035 Fund's assets will be invested in underlying equity funds that each invest at least 80% of their respective assets in public equity securities included in such underlying equity fund's index, and at least 4% of the 2035 Fund's assets will be invested in underlying government securities index funds that each invest at least 80% of their respective assets in government securities included in such underlying government fund's index.

•With respect to Target Retirement 2040 Fund (the “2040 Fund”), at least 60% of the 2040 Fund's assets will be invested in underlying equity funds that each invest at least 80% of their respective assets in public equity securities included in such underlying equity fund's index, and at least 4% of the 2040 Fund's assets will be invested in underlying government securities index funds that each invest at least 80% of their respective assets in government securities included in such underlying government fund's index.

•With respect to Target Retirement 2045 Fund (the “2045 Fund”), at least 65% of the 2045 Fund's assets will be invested in underlying equity funds that each invest at least 80% of their respective assets in public equity securities included in such underlying equity fund's index, and at least 4% of the 2045 Fund's assets will be invested in underlying government securities index funds that each invest at least 80% of their respective assets in government securities included in such underlying government fund's index.

•With respect to Target Retirement 2050 Fund (the “2050 Fund”), at least 70% of the 2050 Fund's assets will be invested in underlying equity funds that each invest at least 80% of their respective assets in public equity securities included in such underlying equity fund's index, and at least 4% of the 2050 Fund's assets will be invested in underlying government securities index funds that each invest at least 80% of their respective assets in government securities included in such underlying government fund's index.

•With respect to Target Retirement 2055 Fund (the “2055 Fund”), at least 70% of the 2055 Fund's assets will be invested in underlying equity funds that each invest at least 80% of their respective assets in public equity securities included in such underlying equity fund's index, and at least 4% of the 2055 Fund's assets will be invested in underlying government securities index funds that each invest at least 80% of their respective assets in government securities included in such underlying government fund's index.

•With respect to Target Retirement 2060 Fund (the “2060 Fund”), at least 70% of the 2060 Fund's assets will be invested in underlying equity funds that each invest at least 80% of their respective assets in public equity securities included in such underlying equity fund's index, and at least 4% of the 2060 Fund's assets will be invested in underlying government securities index funds that each invest at least 80% of their respective assets in government securities included in such underlying government fund's index.

•With respect to Target Retirement 2065 Fund (the “2065 Fund”), at least 70% of the 2065 Fund's assets will be invested in underlying equity funds that each invest at least 80% of their respective assets in public equity securities included in such underlying equity fund's index, and at least 4% of the 2065 Fund's assets will be invested in underlying government securities index funds that each invest at least 80% of their respective assets in government securities included in such underlying government fund's index.

•With respect to Target Retirement 2070 Fund (the “2070 Fund”), at least 70% of the 2070 Fund's assets will be invested in underlying equity funds that each invest at least 80% of their respective assets in public equity securities included in such underlying equity fund's index, and at least 4% of the 2070 Fund's assets will be invested in underlying government securities index funds that each invest at least 80% of their respective assets in government securities included in such underlying government fund's index.

•With respect to Target Retirement Fund (the “Retirement Fund”), at least 15% of the Retirement Fund's assets will be invested in underlying equity funds that each invest at least 80% of their respective assets in public equity securities included in such underlying equity fund's index, and at least 28% of the Retirement Fund's assets will be invested in underlying government securities index funds that each invest at least 80% of their respective assets in government securities included in such underlying government fund's index.

Disclosure of Portfolio Holdings

Introduction

The policies set forth below to be followed by State Street and SSGA FM (collectively, the “Service Providers”) for the disclosure of information about the portfolio holdings of SSGA Funds, State Street Master Funds, and State Street Institutional Investment Trust (each, a “Trust”). These disclosure policies are intended to ensure compliance by the Service Providers and the Trust with applicable regulations of the federal securities laws, including the 1940 Act and the Investment Advisers Act of 1940, as amended. The Board of Trustees must approve all material amendments to the policy.

General Policy

It is the policy of the Service Providers to protect the confidentiality of client holdings and prevent the selective disclosure of non-public information concerning the Trust.

No information concerning the portfolio holdings of the Trust may be disclosed to any party (including shareholders) except as provided below. The Service Providers are not permitted to receive compensation or other consideration in connection with disclosing information about a Fund's portfolio to third-parties. In order to address potential conflicts between the interest of Fund shareholders, on the one hand, and those of the Service Providers or any affiliated person of those entities or of the Fund, on the other hand, the Fund's policies require that non-public disclosures of information regarding the Fund's portfolio may be made only if there is a legitimate business purpose consistent with fiduciary duties to all shareholders of the Fund.

The Board of Trustees exercises continuing oversight over the disclosure of each Fund's holdings by (i) overseeing the implementation and enforcement of the portfolio holding disclosure policy, Codes of Ethics and other relevant policies of each Fund and its Service Providers by the Trust's Chief Compliance Officer (“CCO”), and (ii) considering reports and recommendations by the Trust's CCO concerning any material compliance matters (as defined in Rule 38a-1 under the 1940 Act). The Board reserves the right to amend the policy at any time without prior notice in its sole discretion.

Publicly Available Information. Any party may disclose portfolio holdings information after the holdings are publicly available.

Disclosure of the complete holdings of each Fund is required to be made quarterly within 60 days of the end of the Fund's fiscal quarter in the Fund's Form N-CSR filing to Fund shareholders and in the monthly holdings report on Form N-PORT, with every third month made available to the public by the SEC 60 days after the end of the Portfolios' fiscal quarter. You can find SEC filings on the SEC's website, www.sec.gov. Information about a Fund's 10 largest holdings generally is posted on the Fund's website at SSGA.com, within 30 days following the end of each month. Each Fund will also make complete portfolio holdings available generally no later than 60 calendar days after the end of the Funds' fiscal quarter or subsequent to periodic portfolio holdings disclosure in the Fund's filings with the SEC or on their website.

Press Interviews, Brokers and Other Discussions

Trading Desk Reports

Miscellaneous

Confidentiality Agreement. No non-public disclosure of the Fund's portfolio holdings will be made to any party unless such party has signed a written Confidentiality Agreement. For purposes of the disclosure policies, any Confidentiality Agreement must be in a form and substance acceptable to, and approved by, the Trust's officers.

Evaluation Service Providers. There are numerous mutual fund evaluation services (such as Morningstar, Inc. and Broadridge Financial Solutions, Inc., formerly Lipper, Inc.) and due diligence departments of broker-dealers and wirehouses that regularly analyze the portfolio holdings of mutual funds in order to monitor and report on various attributes. These services and departments then distribute the results of their analysis to the public, paid subscribers and/or in-house brokers. In order to facilitate the review of the Trust by these services and departments, the Trust may distribute (or authorize the Service Providers and the Trust's custodian or fund accountants to distribute) month-end portfolio holdings to such services and departments only if such entity has executed a confidentiality agreement.

State Street Master Funds' Disclosure of Portfolio Holdings Policy: State Street Master Funds have adopted a policy regarding the disclosure of information about their portfolio holdings. The Board of Trustees of State Street Master Funds must approve all material amendments to each policy. A Portfolio's portfolio holdings are publicly disseminated each day the Portfolio is open for business through financial reporting and news services, including publicly accessible Internet web sites. State Street Master Funds, the Adviser, or State Street will not disseminate non-public information concerning State Street Master Funds to any party unless such party has signed a written confidentiality agreement.

Management of the Trust and State Street Master Funds

The Board of Trustees is responsible for overseeing generally the management, activities and affairs of the Funds and has approved contracts with various organizations to provide, among other services, day-to-day management required by the Trust (see the section called “Investment Advisory and Other Services”). The Board has engaged the Adviser to manage the Funds on a day-to day basis. The Board is responsible for overseeing the Adviser and other service providers in the operation of the Trust in accordance with the provisions of the 1940 Act, applicable Massachusetts law and regulation, other applicable laws and regulations, and the Amended and Restated Declaration of Trust. The Trustees listed below are also Trustees of SSGA Funds, State Street Master Funds, State Street Navigator Securities Lending Trust (the “Navigator Trust”), State Street Institutional Funds, State Street Variable Insurance Series Funds, Inc., Elfun Diversified Fund, Elfun Government Money Market Fund, Elfun Tax-Exempt Income Fund, Elfun Income Fund, Elfun

International Equity Fund and Elfun Trusts (collectively, the “Elfun Funds”), and their respective series. The following table provides information with respect to each Trustee, including those Trustees who are not considered to be “interested” as that term is defined in the 1940 Act (the “Independent Trustees”), and each officer of the Trusts.

Name, Address, and Year of Birth	Position(s) Held With Trust	Term of Office and Length of Time Served	Principal Occupation During Past Five Years and Relevant Experience	Number of Funds in Fund Complex Overseen by Trustee†	Other Directorships Held by Trustee During Past Five Years
INDEPENDENT TRUSTEES
PATRICK J. RILEY c/o SSGA Funds Management, Inc. One Iron Street Boston, MA 02210 YOB: 1948	Trustee and Chairperson of the Board	Term: Indefinite Elected: 1/14	Independent Director, State Street Global Advisors Europe Limited (investment company) (1998 – 2023); Independent Director, SSGA Liquidity plc (formerly, SSGA Cash Management Fund plc) (1998 – 2023); and Independent Director, SSGA Fixed Income plc (January 2009 – 2023).	55	Board Director and Chairman, SSGA SPDR ETFs Europe I plc Board (2011 – March 2023); Board Director and Chairman, SSGA SPDR ETFs Europe II plc (2013 – March 2023); Board Director, State Street Liquidity plc (1998 – March 2023).
MARGARET K. MCLAUGHLIN c/o SSGA Funds Management, Inc. One Iron Street Boston, MA 02210 YOB: 1967	Trustee, Chairperson of the Qualified Legal Compliance Committee, and Vice-Chairperson of the Valuation Committee	Term: Indefinite Elected: 12/24	Consultant, Bates Group (consultants) (September 2020 – January 2023); Consultant, Madison Dearborn Partners (private equity) (2019 – 2020).	55	Director, Manning & Napier Fund Inc (2021 – 2022).
GEORGE M. PEREIRA c/o SSGA Funds Management, Inc. One Iron Street Boston, MA 02210 YOB: 1964	Trustee, Chairperson of the Nominating Committee, Chairperson of the Governance Committee, and Vice-Chairperson of the Qualified Legal Compliance Committee	Term: Indefinite Elected: 12/24	Chief Operating Officer (January 2011 – September 2020) and Chief Financial Officer (November 2004 – September 2020), Charles Schwab Investment Management.	55	Director, Pave Finance Inc. (May 2023 – present); Director, Pacific Premier Bancorp, Pacific Premier Bank (2021 – present); Director, Charles Schwab Asset Management (Ireland) Ltd., & Charles Schwab Worldwide Funds plc. (2005 – 2020).
DONNA M. RAPACCIOLI c/o SSGA Funds Management, Inc. One Iron Street Boston, MA 02210 YOB: 1962	Trustee, Chairperson of the Audit Committee, Vice-Chairperson of the Nominating Committee, and Vice-Chairperson of the Governance Committee	Term: Indefinite Elected: 12/18	Dean of the Gabelli School of Business (2007 – June 2022) and Accounting Professor (1987 – present) at Fordham University.	55	Director- Graduate Management Admissions Council (2015 – 2022).
MARK E. SWANSON c/o SSGA Funds Management, Inc. One Iron Street Boston, MA 02210 YOB: 1963	Trustee, Chairperson of the Valuation Committee, and Vice-Chairperson of the Audit Committee	Term: Indefinite Elected: 12/24	Treasurer, Chief Accounting Officer and Chief Financial Officer, Russell Investment Funds (“RIF”) (1998 – 2022); Global Head of Fund Services, Russell Investments (2013 – 2022); Treasurer, Chief Accounting Officer and Chief Financial Officer,	55	Director and President, Russell Investments Fund Services, LLC (2010 – 2023); Director, Russell Investment Management, LLC, Russell Investments Trust Company and Russell Investments Financial Services, LLC (2010 – 2023).

Name, Address, and Year of Birth	Position(s) Held With Trust	Term of Office and Length of Time Served	Principal Occupation During Past Five Years and Relevant Experience	Number of Funds in Fund Complex Overseen by Trustee†	Other Directorships Held by Trustee During Past Five Years
			Russell Investment Company (“RIC”) (1998 – 2022); President and Chief Executive Officer, RIF (2016 – 2017 and 2020 to 2022); President and Chief Executive Officer, RIC (2016 – 2017 and 2020 – 2022).
INTERESTED TRUSTEE(1)
JEANNE LAPORTA(2) c/o SSGA Funds Management, Inc. One Iron Street Boston, MA 02210 YOB: 1965	Trustee	Term: Indefinite Elected: 12/24	Senior Managing Director and Head of Global Funds Management at State Street Global Advisors (August 2024 – present); Chief Administrative Officer at ClearAlpha Technologies LP (FinTech startup) (January 2021 – August 2024); Senior Managing Director at State Street Global Advisors (July 2016 – 2021); Manager of State Street Global Advisors Funds Distributors, LLC (May 2017 – 2021); Director of SSGA Funds Management, Inc. (March 2020 - 2021); President of State Street Institutional Funds and State Street Variable Insurance Series Funds, Inc. (April 2014 – March 2020).	213	Interested Trustee, Select Sector SDPR Trust, SPDR Series Trust, SDPR Index Shares Funds and SSGA Active Trust (November 2024 – present).Interested Trustee, Elfun Government Money Market Fund, Elfun Tax Exempt Income Fund, Elfun Income Fund, Elfun Diversified Fund, Elfun International Equity Fund Elfun Trusts (2016 – 2021).

†

For the purpose of determining the number of portfolios overseen by the Trustees, “Fund Complex” comprises registered investment companies for which SSGA FM serves as investment adviser.

(1)

The individual listed below is a Trustee who is an “interested person,” as defined in the 1940 Act, of the Trust (“Interested Trustee”).

(2)

Ms. LaPorta was elected as Interested Trustee effective January 1, 2025. Ms. LaPorta is an Interested Trustee because of her employment with State Street Global Advisors, an affiliate of the Trust.

Name, Address, and Year of Birth	Position(s) Held With Trust	Term of Office and Length of Time Served	Principal Occupation During Past Five Years
OFFICERS:
ANN M. CARPENTER SSGA Funds Management, Inc. One Iron Street Boston, MA 02210 YOB: 1966	President and Principal Executive Officer; Deputy Treasurer	Term: Indefinite Served: since 5/23 (with respect to President and Principal Executive Officer); Term: Indefinite Served: since 4/19 (with respect to Deputy Treasurer)	Chief Operating Officer, SSGA Funds Management, Inc. (April 2005 – present); Managing Director, State Street Global Advisors (April 2005 – present).
BRUCE S. ROSENBERG SSGA Funds Management, Inc. One Iron Street Boston, MA 02210 YOB: 1961	Treasurer and Principal Financial Officer	Term: Indefinite Served: since 2/16	Managing Director, State Street Global Advisors and SSGA Funds Management, Inc. (July 2015 – present).
CHAD C. HALLETT SSGA Funds Management, Inc. One Iron Street Boston, MA 02210 YOB: 1969	Deputy Treasurer	Term: Indefinite Served: since 2/16	Vice President, State Street Global Advisors and SSGA Funds Management, Inc. (November 2014 – present).
DARLENE ANDERSON-VASQUEZ SSGA Funds Management, Inc. One Iron Street Boston, MA 02210 YOB: 1968	Deputy Treasurer	Term: Indefinite Served: since 11/16	Managing Director, State Street Global Advisors and SSGA Funds Management, Inc. (May 2016 – present).
ARTHUR A. JENSEN SSGA Funds Management, Inc. 1600 Summer Street Stamford, CT 06905 YOB: 1966	Deputy Treasurer	Term: Indefinite Served: since 11/16	Vice President, State Street Global Advisors and SSGA Funds Management, Inc. (July 2016 – present).
DAVID LANCASTER SSGA Funds Management, Inc. One Iron Street Boston, MA 02210 YOB: 1971	Assistant Treasurer	Term: Indefinite Served: since 11/20	Vice President, State Street Global Advisors and SSGA Funds Management, Inc. (July 2017 – present).*
JOHN BETTENCOURT SSGA Funds Management, Inc. One Iron Street Boston, MA 02210 YOB:1976	Assistant Treasurer	Term: Indefinite Served: since 5/22	Vice President, State Street Global Advisors and SSGA Funds Management, Inc. (March 2020 – present).
VEDRAN VUKOVIC SSGA Funds Management, Inc. One Iron Street Boston, MA 02210 YOB: 1985	Assistant Treasurer	Term: Indefinite Served: since 2/24	Vice President, State Street Global Advisors (2023 – present); Assistant Vice President, Brown Brothers Harriman & Co. (2011 – 2023).
BRIAN HARRIS SSGA Funds Management, Inc. One Iron Street Boston, MA 02210 YOB: 1973	Chief Compliance Officer; Anti-Money Laundering Officer; Code of Ethics Compliance Officer	Term: Indefinite Served: since 7/16	Managing Director, State Street Global Advisors and SSGA Funds Management, Inc. (June 2013 – present).*

Name, Address, and Year of Birth	Position(s) Held With Trust	Term of Office and Length of Time Served	Principal Occupation During Past Five Years
ANDREW J. DELORME SSGA Funds Management, Inc. One Iron Street Boston, MA 02210 YOB: 1975	Chief Legal Officer	Term: Indefinite Served: since 2/24	Managing Director and Managing Counsel, State Street Global Advisors (March 2023 – present); Counsel, K&L Gates (February 2021 – March 2023); Vice President and Senior Counsel, State Street Global Advisors (August 2014 – February 2021).
DAVID BARR SSGA Funds Management, Inc. One Iron Street Boston, MA 02210 YOB: 1974	Secretary	Term: Indefinite Served: since 9/20	Vice President and Senior Counsel, State Street Global Advisors (October 2019 – present).
E. GERARD MAIORANA, JR. SSGA Funds Management, Inc. One Iron Street Boston, MA 02210 YOB: 1971	Assistant Secretary	Term: Indefinite Served: since 5/23	Assistant Vice President, State Street Global Advisors (July 2014 – present).
DAVID URMAN SSGA Funds Management, Inc. One Iron Street Boston, MA 02210 YOB: 1985	Assistant Secretary	Term: Indefinite Served: since 8/19	Vice President and Senior Counsel, State Street Global Advisors (April 2019 – present).

Served in various capacities and/or with various affiliated entities during noted time period.

Summary of Trustees' Qualifications

Following is a summary of the experience, attributes and skills which qualify each Trustee to serve on the Boards of Trustees of the Trust and State Street Master Funds.

Patrick J. Riley: Mr. Riley is an experienced business executive with over 47 years of experience in the legal and financial services industries; his experience includes service as a trustee or director of various investment companies and Associate Justice of the Superior Court of the Commonwealth of Massachusetts. He has served on the Board of Trustees and related committees of the Trust for 35 years and possesses significant experience regarding the operations and history of the Trust. Mr. Riley serves as a Trustee of the Navigator Trust, SSGA Funds, State Street Master Funds, Elfun Funds, and State Street Institutional Funds and a Director of State Street Variable Insurance Series Funds, Inc.

Margaret K. McLaughlin: Ms. McLaughlin has over 27 years of experience she has gained in a variety of roles encompassing regulatory, operating, legal, and compliance functions, serving both firms and their boards. Ms. McLaughlin formerly served as a founding member of the executive management team for Kramer Van Kirk Credit Strategies L.P. and its technology affiliate, Mariana Systems LLC, where she was integrally involved in corporate strategy, operational oversight, risk management and board governance. Prior to Kramer Van Kirk, Ms. McLaughlin was Assistant General Counsel to Harris Associates L.P., where she was responsible for legal, regulatory and compliance activities related to the Oakmark Mutual Funds. Ms. McLaughlin has an extensive understanding and perspective on governance, oversight, regulation, policies and procedures from these positions as well as her prior experience with both the Securities and Exchange Commission and the Department of Justice. Ms. McLaughlin currently serves on the Governing Counsel of the Independent Directors Council. Most recently, Ms. McLaughlin has held consulting positions at a major private equity firm and a management consulting firm. Ms. McLaughlin serves as a Trustee of the Navigator Trust, SSGA Funds, State Street Master Funds, Elfun Funds, and State Street Institutional Funds and a Director of State Street Variable Insurance Series Funds, Inc.

while serving as managing director at the New York Stock Exchange. With this professional experience, Mr. Pereira has developed wide-ranging expertise in building and managing financial, operational, technology and risk control platforms for growth and scale within the financial services industry. Additionally, Mr. Pereira is a member of the Latino Corporate Directors Association. Mr. Pereira serves as a Trustee of the Navigator Trust, SSGA Funds, State Street Master Funds, Elfun Funds, and State Street Institutional Funds and a Director of State Street Variable Insurance Series Funds, Inc.

Donna M. Rapaccioli: Ms. Rapaccioli has over 35 years of service as a full-time member of the business faculty at Fordham University, where she developed and taught undergraduate and graduate courses, including International Accounting and Financial Statement Analysis, has taught at the executive MBA level. Ms. Rapaccioli is dean emerita after serving as Dean of the Gabelli School of Business for 15 years. She has served on Association to Advance Collegiate Schools of Business accreditation team visits, as a director for the graduate management admissions council, as well as trustee at Emmanuel College. Ms. Rapaccioli has lectured on accounting and finance topics and consulted for numerous investment banks. Ms. Rapaccioli also serves as a Trustee of the Navigator Trust, SSGA Funds, State Street Master Funds, Elfun Funds, and State Street Institutional Funds and a Director of State Street Variable Insurance Series Funds, Inc.

Mark E. Swanson: Mr. Swanson has over 27 years of experience in executive management with financial services institutions, including extensive experience relating to, fund operations, financial reporting, fund accounting, and fund services. Mr. Swanson recently retired from Russell Investments, having served most recently as the Global Head of Fund Services. Additionally, Mr. Swanson served as Treasurer, Chief Accounting Officer and Chief Financial Officer of Russell Investment Company (“RIC”) and Russell Investment Funds (“RIF”). Previously, Mr. Swanson served as Global Head of Fund Operations for Russell, as well as serving in different directorships with RIC, RIF and other Russell entities. Mr. Swanson serves as a Trustee of the Navigator Trust, SSGA Funds, State Street Master Funds, Elfun Funds, and State Street Institutional Funds and a Director of State Street Variable Insurance Series Funds, Inc.

Standing Committees

Each of the Governance Committee and the Nominating Committee is composed of all the Independent Trustees. The primary functions of the Governance Committee and the Nominating Committee are to review and evaluate the composition and performance of the Board; make nominations for membership on the Board and committees; review the responsibilities of each committee; and review governance procedures, compensation of Independent Trustees, and independence of outside counsel to the Trustees. The Nominating Committee will consider nominees to the Board recommended by shareholders. Recommendations should be submitted in accordance with the procedures set forth in the Nominating Committee Charter and should be submitted in writing to the Trust, to the attention of the Trust's Secretary, at

the address of the principal executive offices of the Trust. Shareholder recommendations must be delivered to, or mailed and received at, the principal executive offices of the Trust not less than sixty (60) calendar days nor more than ninety (90) calendar days prior to the date of the Board or shareholder meeting at which the nominee candidate would be considered for election. The Governance Committee performs an annual self-evaluation of Board members. During the fiscal year ended December 31, 2024, the Governance Committee and Nominating Committee held four combined meetings.

Leadership Structure and Risk Management Oversight

Trustee Ownership of Securities of the Trust, Adviser and Distributor

The following table sets forth information describing the dollar range of the Trust's equity securities beneficially owned by each Trustee as of December 31, 2024.

Name of Trustee	Dollar Range Of Equity Securities In The Funds	Aggregate Dollar Range Of Equity Securities In All Registered Investment Companies Overseen By Trustees In Family of Investment Companies
Independent Trustees:
Patrick J. Riley	None	Over $100,000
John R Costantino(1)	None	None
Michael A. Jessee(1)	None	None
Margaret McLaughlin	None	None
George M. Pereira	None	None
Donna M. Rapaccioli	None	None
Mark E. Swanson	None	None
Interested Trustee:
Jeanne LaPorta(2)	None	None

(1)

Messrs. Costantino and Jessee retired from the Board of Directors of the Trust effective December 31, 2024.

(2)

Ms. LaPorta was elected as Interested Trustee effective January 1, 2025.

Trustee Compensation

The following table sets forth the total remuneration of Trustees and officers of the Trust for the fiscal year ended December 31, 2024:

Name of Trustee	Aggregate Compensation from the Trust	Pension or Retirement Benefits Accrued as Part of Trust Expenses	Estimated Annual Benefits Upon Retirement	Total Compensation from the Trust and Fund Complex Paid to Trustees
Independent Trustees:
Patrick J. Riley	$139,092	$0	$0	$490,000
John R. Costantino(1)	$110,706	$0	$0	$390,000
Michael A. Jessee(1)	$110,706	$0	$0	$390,000
Donna M. Rapaccioli	$110,706	$0	$0	$390,000
Margaret McLaughlin	$110,706	$0	$0	$390,000
George M. Pereira	$110,706	$0	$0	$390,000
Mark E. Swanson	$110,706	$0	$0	$390,000
Interested Trustee:
Jeanne LaPorta(2)	N/A	N/A	N/A	N/A

(1)

Messrs. Costantino and Jessee retired from the Board of Directors of the Trust effective December 31, 2024.

(2)

Ms. LaPorta was elected as Interested Trustee effective January 1, 2025.

Proxy Voting Procedures

The Board has delegated the responsibility to vote proxies on securities held by the Funds and Portfolios to the Adviser for all Funds and Portfolios, subject to certain exceptions. The Board has retained authority to vote proxies for certain bank and bank holding company securities (“Bank Securities”) that may be held by one or more Funds and Portfolios from time to time. The Board has adopted the Institutional Shareholder Services, Inc.'s (“ISS”) benchmark proxy voting policy with respect to voting such Bank Securities' proxies. The Board has retained this authority in order to permit the Adviser to utilize exemptions from limitations arising under the Bank Holding Company Act of 1956, as amended, that might otherwise prevent the Adviser from investing a Fund' or Portfolio's s assets in Bank Securities.

Certain Funds and Portfolios that employ an equity index strategy (each such Fund, an “Eligible Fund” and, collectively, the “Eligible Funds”) participate in a proxy voting program (the “Program”) administered by the Adviser through which Eligible Fund shareholders identified by Broadridge Financial Solutions, Inc. (as described below) have the option of selecting an alternative, third-party proxy voting policy that the Fund will use to vote proxies on securities, including Bank Securities, corresponding to the percentage of the Eligible Fund owned by the shareholder as of the record date of the applicable shareholder meeting. The proxy voting policies made available through the Program comprise proxy voting policies maintained by ISS (each such proxy voting policy, a “Program Proxy Voting Policy”). If an Eligible Fund shareholder does not make a Program Proxy Voting Policy selection, the Eligible Fund's proxies corresponding to the percentage of such shareholder's ownership of the Eligible Fund will be voted in accordance with the Adviser's proxy voting policy, except with respect to proxies on Bank Securities, which will be voted in accordance with the ISS benchmark proxy voting policy. In an unusual case, the Adviser may override a vote that would otherwise be made pursuant to a Program Proxy Voting Policy if the Adviser determines that it is not in the best interests of the Eligible Fund and its shareholders to vote pursuant to such Program Proxy Voting Policy. This might be the case, for example, if the Adviser becomes aware that ISS is planning to vote in a way that creates material concerns related to a conflict of interest with ISS; if the Adviser believes that the voting position, if successful, might have a material impact on an Eligible Fund's ability to trade the security; if the Adviser determines that sanctions affecting a company or an individual prevent such a vote; if issuer specific documentation or market confirmation is required; or if the Adviser determines that custodial restrictions or expenses make voting in accordance with the policy inadvisable or impracticable. In the unusual event the Adviser overrides a proxy vote that would otherwise be made pursuant to a Program Proxy Voting Policy, such proxy will be voted in accordance with the Adviser's proxy voting policy, except with respect to proxies on Bank Securities, which will be voted in accordance with the ISS benchmark proxy voting policy.

As a shareholder of a Portfolio, each of the Feeder Funds that invests in a Portfolio that is an Eligible Fund (each such Feeder Fund, an “Eligible Feeder Fund” and each such Portfolio, an “Eligible Portfolio”) will pass through to its eligible shareholders the ability to participate in in the Program. Eligible Feeder Fund shareholders will have the option of selecting a Program Proxy Voting Policy that the Eligible Feeder Fund will then select as its Program Proxy Voting Policy with respect to the portion of Eligible Portfolio beneficial interests owned by the Feeder Fund that corresponds to the percentage of Eligible Feeder Fund shares beneficially owned by the shareholder. The Eligible Portfolio will vote proxies on securities, including Bank Securities, using the Program Proxy Voting Policies corresponding to the percentage of the Eligible Portfolio beneficial interests owned by the Eligible Feeder Fund as of the record date of the applicable shareholder meeting. The Adviser has engaged Broadridge Financial Solutions, Inc. (“Broadridge”) to periodically, but at least annually, identify beneficial owners of Eligible Fund shares held through a financial intermediary for participation in the Program. Eligible Fund shareholders that hold Eligible Fund shares in an account directly with the Eligible Fund and not through a financial intermediary currently are not able to participate in the Program. Eligible Fund shareholders that do not own their Eligible Fund shares as of the most recent date used by Broadridge for shareholder identification purposes will not be able to participate in the Program (but may be eligible to participate in the future if identified as an Eligible Fund shareholder by Broadridge at a later date). It is also possible that some Eligible Fund shareholders that own Eligible Fund shares as of the most recent date used by Broadridge for shareholder identification purposes may not be able to participate in the Program if the beneficial ownership information for their shares is not immediately available to Broadridge (e.g., where a shareholder's financial intermediary is not part of Broadridge's network of financial intermediaries that provides shareholder information to Broadridge or where a shareholder has objected to its financial intermediary releasing the shareholder's personal information to issuers for proxy voting purposes). Eligible Fund shareholders identified by Broadridge will receive a communication that will invite such shareholders to participate in the Program by selecting a Program Proxy Voting Policy on the Program's website. Shareholders should carefully read Program communications and the Program's website for more details regarding how Eligible Fund shareholders may

participate in the Program, how Eligible Fund shareholders may change or cancel their Program Proxy Voting Policy selection, risk factors associated with the Program and how an Eligible Fund shareholder's selection of a specific Program Proxy Voting Policy will be implemented. Shareholders may call 1-866-787-2257 for a list of Funds that are currently participating in the Program.

Each of the Trust's and the Adviser's proxy voting policy, ISS' benchmark proxy voting policy, as well as each Program Proxy Voting Policy, is attached as an appendix to this SAI. Information regarding how a Fund and a Portfolio voted proxies relating to its portfolio securities during the most recent twelve-month period ended June 30 is available: (1) without charge by calling 1-866-787-2257; (2) on the Funds' and Portfolios' website at https://www.ssga.com; and (3) on the SEC's website at https://www.sec.gov.

Control Persons and Principal Holders of Securities

As of March 31, 2025, the Trustees and officers of the Trust owned in the aggregate less than 1% of the shares of each class (if applicable) of each Fund.

As of March 31, 2025, to the knowledge of the Trust, the following persons held of record or beneficially through one or more accounts 25% or more of the outstanding shares of a Fund.

Name and Address	Percentage
State Street Aggregate Bond Index Fund- Class A State Street Bank & Trust as Trustee and/or Cust FBO ADP Access Product 1 Lincoln St. Boston, MA 02111-2900	70.30 %
State Street Aggregate Bond Index Fund- Class I Brown Brothers Harriman & Co as Custodian for 0540062 140 Broadway St New York, NY 010005-1108	30.39 %
State Street Aggregate Bond Index Fund- Class K Mid Atlantic Trust Company FBO TPP IRA 1251 Waterfront Place, Suite 525 Pittsburgh, PA 15222-4228	36.17 %
State Street Balanced Index Fund-Class K Nationwide Investment Services Nationwide Trust Company, FSB C/O IPO Portfolio Accounting P.O. BOX 182029 Columbus, OH 43218-2029	79.13 %
State Street Emerging Markets Equity Index Fund-Class K Goldman Sachs & Co C/O Mutual Funds OPS 222 S. Main St. Salt Lake City, UT 84101-2174	92.92 %
State Street Equity 500 Index Fund- Administrative Shares American United Life Insurance CO American Unit Trust Attn Separate Accounts PO BOX 368 Indianapolis, IN 46206-0368	99.95 %
State Street Equity 500 Index Fund- Class A State Street Bank & Trust as Trustee and/or Cust FBO ADP Access Product 1 Lincoln St. Boston, MA 02111-2900	94.77 %

Name and Address	Percentage
State Street Equity 500 Index Fund- Class I Sei Trust Company Sei Private Trust Company C/O Principal Financial Id 636 Attn: Mutual Fund Administrator One Freedom Valley Drive Oaks, PA 19456-9989	38.97 %
State Street Bank & Trust as Trustee and/or Cust FBO ADP Access Product 1 Lincoln St. Boston, MA 02111-2900	31.09 %
State Street Equity 500 Index Fund- Class K State Street Bank & Trust as Trustee and/or Cust FBO ADP Access Product 1 Lincoln St. Boston, MA 02111-2900	28.79 %
State Street Equity 500 Index Fund- Class R American United Life Insurance CO American Unit Trust Attn Separate Accounts PO BOX 368 Indianapolis, IN 46206-0368	80.94 %
State Street Equity 500 Index Fund- Service Shares Nationwide Investment Services Nationwide Trust Company, FSB FBO Participating Retirement Plans P.O. BOX 182029 Columbus, OH 43218-2029	99.57 %
State Street Global All Cap Equity ex-U.S. Index Fund- Class A State Street Bank & Trust as Trustee and/or Cust FBO ADP Access Product 1 Lincoln St. Boston, MA 02111-2900	89.43 %
State Street Global All Cap Equity ex-U.S. Index Fund- Class I Charles Schwab & Co Inc, Special Cust A/C FBO our Customers Attn: Mutual Funds 211 Main St. San Francisco, CA 94105-1901	88.35 %
State Street Global All Cap Equity ex-U.S. Index Fund- Class K Mid Atlantic Trust Company FBO TPP IRA 1251 Waterfront Place, Suite 525 Pittsburgh, PA 15222-4228	26.17 %
State Street Hedged International Developed Equity Index Fund-Class K Goldman Sachs & Co C/O Mutual Funds OPS 222 S. Main St. Salt Lake City, UT 84101-2174	67.57 %
State Street Small/Mid Cap Equity Index Fund -Class A State Street Bank & Trust as Trustee and/or Cust FBO ADP Access Product 1 Lincoln St. Boston, MA 02111-2900	68.34 %
State Street Small/Mid Cap Equity Index Fund -Class I Sei Trust Company Sei Private Trust Company C/O Principal Financial Id 636 Attn: Mutual Fund Administrator One Freedom Valley Drive Oaks, PA 19456-9989	88.91 %
State Street Small/Mid Cap Equity Index Fund -Class K National Financial Services LLC For the exclusive benefit of our customers Attn Mutual Funds Department 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	38.16 %

Name and Address	Percentage
State Street Target Retirement 2025 Fund-Class I National Financial Services LLC For the exclusive benefit of our customers Attn Mutual Funds Department 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	98.71 %
State Street Target Retirement 2025 Fund-Class K National Financial Services Corporation For the Exclusive Benefit of Our Customers Attn Mutual Funds 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	41.31 %
State Street Target Retirement 2025 Fund-Class R3 State Street Bank & Trust as Trustee and/or Cust FBO ADP Access Product 1 Lincoln St. Boston, MA 02111-2900	100.00 %
State Street Target Retirement 2030 Fund-Class I National Financial Services LLC For the exclusive benefit of our customers Attn Mutual Funds Department 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	97.89 %
State Street Target Retirement 2030 Fund-Class K National Financial Services Corporation For the Exclusive Benefit of Our Customers Attn Mutual Funds 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	42.24 %
State Street Target Retirement 2030 Fund-Class R3 State Street Bank & Trust as Trustee and/or Cust FBO ADP Access Product 1 Lincoln St. Boston, MA 02111-2900	100.00 %
State Street Target Retirement 2035 Fund-Class I National Financial Services LLC For the exclusive benefit of our customers Attn Mutual Funds Department 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	90.37 %
State Street Target Retirement 2035 Fund-Class K National Financial Services Corporation For the Exclusive Benefit of Our Customers Attn Mutual Funds 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	43.83 %
State Street Target Retirement 2035 Fund-Class R3 State Street Bank & Trust as Trustee and/or Cust FBO ADP Access Product 1 Lincoln St. Boston, MA 02111-2900	100.00 %
State Street Target Retirement 2040 Fund-Class I National Financial Services LLC For the exclusive benefit of our customers Attn Mutual Funds Department 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	93.32 %
State Street Target Retirement 2040 Fund-Class K National Financial Services Corporation For the Exclusive Benefit of Our Customers Attn Mutual Funds 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	42.51 %

Name and Address	Percentage
State Street Target Retirement 2040 Fund-Class R3 State Street Bank & Trust as Trustee and/or Cust FBO ADP Access Product 1 Lincoln St. Boston, MA 02111-2900	100.00 %
State Street Target Retirement 2045 Fund-Class I National Financial Services LLC For the exclusive benefit of our customers Attn Mutual Funds Department 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	99.35 %
State Street Target Retirement 2045 Fund-Class K National Financial Services Corporation For the Exclusive Benefit of Our Customers Attn Mutual Funds 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	43.68 %
State Street Target Retirement 2045 Fund-Class R3 State Street Bank & Trust as Trustee and/or Cust FBO ADP Access Product 1 Lincoln St. Boston, MA 02111-2900	100.00 %
State Street Target Retirement 2050 Fund-Class I National Financial Services LLC For the exclusive benefit of our customers Attn Mutual Funds Department 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	75.40 %
State Street Target Retirement 2050 Fund-Class K National Financial Services Corporation For the Exclusive Benefit of Our Customers Attn Mutual Funds 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	39.93 %
State Street Target Retirement 2050 Fund-Class R3 State Street Bank & Trust as Trustee and/or Cust FBO ADP Access Product 1 Lincoln St. Boston, MA 02111-2900	100.00 %
State Street Target Retirement 2055 Fund-Class I GWFS Equities Inc. Empower Trust FBO Employee Benefits Clients 401K 8515 E. Orchard Rd. 2T2 Greenwood Village, CO 80111-5002	55.00 %
National Financial Services LLC For the exclusive benefit of our customers Attn Mutual Funds Department 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	44.61 %
State Street Target Retirement 2055 Fund-Class K National Financial Services Corporation For the Exclusive Benefit of Our Customers Attn Mutual Funds 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	33.46 %
State Street Target Retirement 2055 Fund-Class R3 State Street Bank & Trust as Trustee and/or Cust FBO ADP Access Product 1 Lincoln St. Boston, MA 02111-2900	100.00 %

Name and Address	Percentage
State Street Target Retirement 2060 Fund-Class I National Financial Services LLC For the exclusive benefit of our customers Attn Mutual Funds Department 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	87.59 %
State Street Target Retirement 2060 Fund-Class R3 State Street Bank & Trust as Trustee and/or Cust FBO ADP Access Product 1 Lincoln St. Boston, MA 02111-2900	100.00 %
State Street Target Retirement 2065 Fund-Class I National Financial Services LLC For the exclusive benefit of our customers Attn Mutual Funds Department 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	79.35 %
State Street Target Retirement 2065 Fund-Class K MAC & CO A/C 471727 Attn: Mutual Fund Operations Room 151-1010 500 Grant Street Pittsburgh PA 15219-2502	30.17 %
State Street Target Retirement 2065 Fund-Class R3 State Street Bank & Trust as Trustee and/or Cust FBO ADP Access Product 1 Lincoln St. Boston, MA 02111-2900	100.00 %
State Street Target Retirement 2070 Fund-Class I SSGA Private Funds LLC Attn Fund Services Team 1 Lincoln St Boston, MA 02111-2901	100.00 %
State Street Target Retirement 2070 Fund-Class K MAC & CO A/C 262554 Attn: Mutual Fund Operations Room 151-1010 500 Grant Street Pittsburgh PA 15219-2531	93.55 %
State Street Target Retirement 2070 Fund-Class R3 SSGA Private Funds LLC Attn Fund Services Team 1 Lincoln St Boston, MA 02111-2901	100.00 %
State Street Target Retirement Fund-Class I National Financial Services LLC For the exclusive benefit of our customers Attn Mutual Funds Department 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	94.66 %
State Street Target Retirement Fund-Class K National Financial Services Corporation For the Exclusive Benefit of Our Customers Attn Mutual Funds 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	37.10 %
State Street Target Retirement Fund-Class R3 State Street Bank & Trust as Trustee and/or Cust FBO ADP Access Product 1 Lincoln St. Boston, MA 02111-2900	100.00 %

As of March 31, 2025, to the knowledge of the Trust, the following persons held of record or beneficially through one or more accounts 5% or more of the outstanding shares of a Fund.

Name and Address	Percentage
State Street Aggregate Bond Index Fund- Class A State Street Bank & Trust as Trustee and/or Cust FBO ADP Access Product 1 Lincoln St. Boston, MA 02111-2900	70.30 %
State Street Aggregate Bond Index Fund- Class I Brown Brothers Harriman & Co as Custodian for 0540062 140 Broadway St New York, NY 010005-1108	30.39 %
Brown Brothers Harriman & Co as Custodian for 6659510 140 Broadway St New York, NY 010005-1108	16.99 %
Brown Brothers Harriman & Co as Custodian for 0549246 140 Broadway St New York, NY 010005-1108	14.07 %
GWFS Equities Inc. Empower Trust FBO Employee Benefits Clients 401K 8515 E. Orchard Rd. 2T2 Greenwood Village, CO 80111-5002	8.15 %
Brown Brothers Harriman & Co as Custodian for 8078511 140 Broadway St New York, NY 010005-1108	7.98 %
Brown Brothers Harriman & Co. As Custodian for Dreyfus Sons & CO LTD Omnibus account 8052003 CASH 140 Broadway St. New York, NY 010005-1108	7.76 %
MSCS Financial Services, LLC Gerlach & CO, LLC/CITIBANK OPEN WE0 3800 CITIGROUP CENTER BUILDING B3-14 TAMPA FL 33610	7.10 %
State Street Aggregate Bond Index Fund- Class K Mid Atlantic Trust Company FBO TPP IRA 1251 Waterfront Place, Suite 525 Pittsburgh, PA 15222-4228	36.17 %
National Financial Services LLC For the exclusive benefit of our customers Attn Mutual Funds Department 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	16.63 %
Goldman Sachs & Co C/O Mutual Funds OPS 222 S. Main St. Salt Lake City, UT 84101-2174	10.36 %
TIAA-CREFF TIAA Trust, N.A. as CUST/TTEE Retirement Plans For Which TIAA Acts As Recordkeeper Attn Fund Operations 8500 Andrew Carnegie Blvd Charlotte, NC 28262-8500	6.66 %
State Street Balanced Index Fund-Class K Nationwide Investment Services Nationwide Trust Company, FSB C/O IPO Portfolio Accounting P.O. BOX 182029 Columbus, OH 43218-2029	79.13 %
Charles Schwab & Co Inc, Special Cust A/C FBO our Customers Attn: Treasury 211 Main St. San Francisco, CA 94105-1901	9.33 %

Name and Address	Percentage
State Street Emerging Markets Equity Index Fund-Class K Goldman Sachs & Co C/O Mutual Funds OPS 222 S. Main St. Salt Lake City, UT 84101-2174	92.92 %
State Street Equity 500 Index Fund- Administrative Shares American United Life Insurance CO American Unit Trust Attn Separate Accounts PO BOX 368 Indianapolis, IN 46206-0368	99.95 %
State Street Equity 500 Index Fund- Class A State Street Bank & Trust as Trustee and/or Cust FBO ADP Access Product 1 Lincoln St. Boston, MA 02111-2900	94.77 %
State Street Equity 500 Index Fund- Class I Sei Trust Company Sei Private Trust Company C/O Principal Financial Id 636 Attn: Mutual Fund Administrator One Freedom Valley Drive Oaks, PA 19456-9989	38.97 %
State Street Bank & Trust as Trustee and/or Cust FBO ADP Access Product 1 Lincoln St. Boston, MA 02111-2900	31.09 %
Charles Schwab & Co Inc, Special Cust A/C FBO our Customers Mutual Funds 101 Montgomery Street. San Francisco, CA 94105-1901	14.37 %
National Financial Services LLC For the exclusive benefit of our customers Attn Mutual Funds Department 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	9.68 %
State Street Equity 500 Index Fund- Class K State Street Bank & Trust as Trustee and/or Cust FBO ADP Access Product 1 Lincoln St. Boston, MA 02111-2900	28.79 %
Mid Atlantic Trust Company FBO TPP IRA 1251 Waterfront Place, Suite 525 Pittsburgh, PA 15222-4228	16.31 %
National Financial Services LLC For the exclusive benefit of our customers Attn Mutual Funds Department 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	15.89 %
TIAA-CREFF TIAA Trust, N.A. as CUST/TTEE Retirement Plans For Which TIAA Acts As Recordkeeper Attn Fund Operations 8500 Andrew Carnegie Blvd Charlotte, NC 28262-8500	12.07 %
State Street Equity 500 Index Fund- Class R American United Life Insurance CO American Unit Trust Attn Separate Accounts PO BOX 368 Indianapolis, IN 46206-0368	80.94 %

Name and Address	Percentage
American United Life Insurance Group Retirement Account II Attn Separate Accounts PO BOX 368 Indianapolis, IN 46206-0368	19.06 %
State Street Equity 500 Index Fund- Service Shares Nationwide Investment Services Nationwide Trust Company, FSB FBO Participating Retirement Plans P.O. BOX 182029 Columbus, OH 43218-2029	99.57 %
State Street Global All Cap Equity ex-U.S. Index Fund- Class A State Street Bank & Trust as Trustee and/or Cust FBO ADP Access Product 1 Lincoln St. Boston, MA 02111-2900	89.43 %
State Street Global All Cap Equity ex-U.S. Index Fund- Class I Charles Schwab & Co Inc, Special Cust A/C FBO our Customers Attn: Mutual Funds 211 Main St. San Francisco, CA 94105-1901	88.35 %
Pershing LLC P.O. Box 2052 Jersey City, NJ 07303-2052	6.82 %
State Street Global All Cap Equity ex-U.S. Index Fund- Class K Mid Atlantic Trust Company FBO TPP IRA 1251 Waterfront Place, Suite 525 Pittsburgh, PA 15222-4228	26.17 %
TIAA-CREFF TIAA Trust, N.A. as CUST/TTEE Retirement Plans For Which TIAA Acts As Recordkeeper Attn Fund Operations 8500 Andrew Carnegie Blvd Charlotte, NC 28262-8500	20.83 %
MSCS Financial Services, LLC SEI Private Trust Company C/O ID 370 Attn: Mutual Fund Administrator One Freedom Valley Drive, Oaks, PA 19456-9989	15.17 %
National Financial Services LLC For the exclusive benefit of our customers Attn Mutual Funds Department 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	12.02 %
State Street Hedged International Developed Equity Index Fund-Class K Goldman Sachs & Co C/O Mutual Funds OPS 222 S. Main St. Salt Lake City, UT 84101-2174	67.57 %
National Financial Services LLC For the exclusive benefit of our customers Attn Mutual Funds Department 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	13.31 %
Charles Schwab & Co Inc, Special Cust A/C FBO our Customers Mutual Funds 101 Montgomery Street. San Francisco, CA 94105-1901	9.71 %
State Street Small/Mid Cap Equity Index Fund -Class A State Street Bank & Trust as Trustee and/or Cust FBO ADP Access Product 1 Lincoln St. Boston, MA 02111-2900	68.34 %

Name and Address	Percentage
Charles Schwab & Co Inc, Special Cust A/C FBO our Customers Mutual Funds 101 Montgomery Street. San Francisco, CA 94105-1901	7.92 %
State Street Small/Mid Cap Equity Index Fund -Class I Sei Trust Company Sei Private Trust Company C/O Principal Financial Id 636 Attn: Mutual Fund Administrator One Freedom Valley Drive Oaks, PA 19456-9989	88.91 %
Pershing LLC P.O. Box 2052 Jersey City, NJ 07303-2052	8.20 %
State Street Small/Mid Cap Equity Index Fund -Class K National Financial Services LLC For the exclusive benefit of our customers Attn Mutual Funds Department 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	38.16 %
TIAA-CREFF TIAA Trust, N.A. as CUST/TTEE Retirement Plans For Which TIAA Acts As Recordkeeper Attn Fund Operations 8500 Andrew Carnegie Blvd Charlotte, NC 28262-8500	24.87 %
T Rowe Price Retirement Reliance Trust Company FBO P.O. Box 78446 Atlanta, GA 30357	7.55 %
State Street Target Retirement 2025 Fund-Class I National Financial Services LLC For the exclusive benefit of our customers Attn Mutual Funds Department 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	98.71 %
State Street Target Retirement 2025 Fund-Class K National Financial Services Corporation For the Exclusive Benefit of Our Customers Attn Mutual Funds 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	41.31 %
Vanguard Fiduciary Trust CO FBO 401K Clients Attn: Investment Services P.O. Box 2600 VM L20 Valley Forge, PA 19482-2600	11.99 %
Mid Atlantic Trust Company FBO Paychex Pooled Employer 401(K) 1251 Waterfront Place, Suite 525 Pittsburgh, PA 15222-4228	5.38 %
State Street Target Retirement 2025 Fund-Class R3 State Street Bank & Trust as Trustee and/or Cust FBO ADP Access Product 1 Lincoln St. Boston, MA 02111-2900	100.00 %
State Street Target Retirement 2030 Fund-Class I National Financial Services LLC For the exclusive benefit of our customers Attn Mutual Funds Department 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	97.89 %

Name and Address	Percentage
State Street Target Retirement 2030 Fund-Class K National Financial Services Corporation For the Exclusive Benefit of Our Customers Attn Mutual Funds 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	42.24 %
Vanguard Fiduciary Trust CO FBO 401K Clients Attn: Investment Services P.O. Box 2600 VM L20 Valley Forge, PA 19482-2600	9.47 %
DCGT as TTEE and/or CUST FBO PLIC Various Retirement Plans Omnibus Attn NPIO Trade Desk Attn NPIO Trade Desk 711 High Street Des Moines, IA 50392-0001	6.14 %
Mid Atlantic Trust Company FBO Paychex Pooled Employer 401(K) 1251 Waterfront Place, Suite 525 Pittsburgh, PA 15222-4228	5.09 %
State Street Target Retirement 2030 Fund-Class R3 State Street Bank & Trust as Trustee and/or Cust FBO ADP Access Product 1 Lincoln St. Boston, MA 02111-2900	100.00 %
State Street Target Retirement 2035 Fund-Class I National Financial Services LLC For the exclusive benefit of our customers Attn Mutual Funds Department 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	90.37 %
GWFS Equities Inc. Empower Trust FBO Employee Benefits Clients 401K 8515 E. Orchard Rd. 2T2 Greenwood Village, CO 80111-5002	8.17 %
State Street Target Retirement 2035 Fund-Class K National Financial Services Corporation For the Exclusive Benefit of Our Customers Attn Mutual Funds 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	43.83 %
Vanguard Fiduciary Trust CO FBO 401K Clients Attn: Investment Services P.O. Box 2600 VM L20 Valley Forge, PA 19482-2600	8.48 %
Mid Atlantic Trust Company FBO Paychex Pooled Employer 401(K) 1251 Waterfront Place, Suite 525 Pittsburgh, PA 15222-4228	6.07 %
State Street Target Retirement 2035 Fund-Class R3 State Street Bank & Trust as Trustee and/or Cust FBO ADP Access Product 1 Lincoln St. Boston, MA 02111-2900	100.00 %
State Street Target Retirement 2040 Fund-Class I National Financial Services LLC For the exclusive benefit of our customers Attn Mutual Funds Department 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	93.32 %

Name and Address	Percentage
State Street Target Retirement 2040 Fund-Class K National Financial Services Corporation For the Exclusive Benefit of Our Customers Attn Mutual Funds 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	42.51 %
Vanguard Fiduciary Trust CO FBO 401K Clients Attn: Investment Services P.O. Box 2600 VM L20 Valley Forge, PA 19482-2600	7.62 %
DCGT as TTEE and/or CUST FBO PLIC Various Retirement Plans Omnibus Attn NPIO Trade Desk Attn NPIO Trade Desk 711 High Street Des Moines, IA 50392-0001	6.24 %
Mid Atlantic Trust Company FBO Paychex Pooled Employer 401(K) 1251 Waterfront Place, Suite 525 Pittsburgh, PA 15222-4228	6.06 %
State Street Target Retirement 2040 Fund-Class R3 State Street Bank & Trust as Trustee and/or Cust FBO ADP Access Product 1 Lincoln St. Boston, MA 02111-2900	100.00 %
State Street Target Retirement 2045 Fund-Class I National Financial Services LLC For the exclusive benefit of our customers Attn Mutual Funds Department 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	99.35 %
State Street Target Retirement 2045 Fund-Class K National Financial Services Corporation For the Exclusive Benefit of Our Customers Attn Mutual Funds 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	43.68 %
Mid Atlantic Trust Company FBO Paychex Pooled Employer 401(K) 1251 Waterfront Place, Suite 525 Pittsburgh, PA 15222-4228	7.16 %
Vanguard Fiduciary Trust CO FBO 401K Clients Attn: Investment Services P.O. Box 2600 VM L20 Valley Forge, PA 19482-2600	6.88 %
State Street Target Retirement 2045 Fund-Class R3 State Street Bank & Trust as Trustee and/or Cust FBO ADP Access Product 1 Lincoln St. Boston, MA 02111-2900	100.00 %
State Street Target Retirement 2050 Fund-Class I National Financial Services LLC For the exclusive benefit of our customers Attn Mutual Funds Department 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	75.40 %
GWFS Equities Inc. Empower Trust FBO Employee Benefits Clients 401K 8515 E. Orchard Rd. 2T2 Greenwood Village, CO 80111-5002	17.93 %

Name and Address	Percentage
State Street Target Retirement 2050 Fund-Class K National Financial Services Corporation For the Exclusive Benefit of Our Customers Attn Mutual Funds 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	39.93 %
Mid Atlantic Trust Company FBO Paychex Pooled Employer 401(K) 1251 Waterfront Place, Suite 525 Pittsburgh, PA 15222-4228	8.11 %
Vanguard Fiduciary Trust CO FBO 401K Clients Attn: Investment Services P.O. Box 2600 VM L20 Valley Forge, PA 19482-2600	6.80 %
MAC & CO A/C 471710 Attn: Mutual Fund Operations Room 151-1010 500 Grant Street Pittsburgh PA 15219-2502	5.42 %
State Street Target Retirement 2050 Fund-Class R3 State Street Bank & Trust as Trustee and/or Cust FBO ADP Access Product 1 Lincoln St. Boston, MA 02111-2900	100.00 %
State Street Target Retirement 2055 Fund-Class I GWFS Equities Inc. Empower Trust FBO Employee Benefits Clients 401K 8515 E. Orchard Rd. 2T2 Greenwood Village, CO 80111-5002	55.00 %
National Financial Services LLC For the exclusive benefit of our customers Attn Mutual Funds Department 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	44.61 %
State Street Target Retirement 2055 Fund-Class K National Financial Services Corporation For the Exclusive Benefit of Our Customers Attn Mutual Funds 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	33.46 %
Mid Atlantic Trust Company FBO Paychex Pooled Employer 401(K) 1251 Waterfront Place, Suite 525 Pittsburgh, PA 15222-4228	9.37 %
MAC & CO A/C 471712 Attn: Mutual Fund Operations Room 151-1010 500 Grant Street Pittsburgh PA 15219-2502	7.94 %
Vanguard Fiduciary Trust CO FBO 401K Clients Attn: Investment Services P.O. Box 2600 VM L20 Valley Forge, PA 19482-2600	6.90 %
GWFS Equities Inc. Empower Trust FBO Employee Benefits Clients 401K 8515 E. Orchard Rd. 2T2 Greenwood Village, CO 80111-5002	5.58 %

Name and Address	Percentage
State Street Target Retirement 2055 Fund-Class R3 State Street Bank & Trust as Trustee and/or Cust FBO ADP Access Product 1 Lincoln St. Boston, MA 02111-2900	100.00 %
State Street Target Retirement 2060 Fund-Class I National Financial Services LLC For the exclusive benefit of our customers Attn Mutual Funds Department 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	87.59 %
GWFS Equities Inc. Empower Trust FBO Employee Benefits Clients 401K 8515 E. Orchard Rd. 2T2 Greenwood Village, CO 80111-5002	8.80 %
State Street Target Retirement 2060 Fund-Class K National Financial Services Corporation For the Exclusive Benefit of Our Customers Attn Mutual Funds 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	22.34 %
Mid Atlantic Trust Company FBO Paychex Pooled Employer 401(K) 1251 Waterfront Place, Suite 525 Pittsburgh, PA 15222-4228	16.40 %
MAC & CO A/C 471727 Attn: Mutual Fund Operations Room 151-1010 500 Grant Street Pittsburgh PA 15219-2502	12.45 %
Vanguard Fiduciary Trust CO FBO 401K Clients Attn: Investment Services P.O. Box 2600 VM L20 Valley Forge, PA 19482-2600	5.25 %
State Street Target Retirement 2060 Fund-Class R3 State Street Bank & Trust as Trustee and/or Cust FBO ADP Access Product 1 Lincoln St. Boston, MA 02111-2900	100.00 %
State Street Target Retirement 2065 Fund-Class I National Financial Services LLC For the exclusive benefit of our customers Attn Mutual Funds Department 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	79.35 %
GWFS Equities Inc. Empower Trust FBO Employee Benefits Clients 401K 8515 E. Orchard Rd. 2T2 Greenwood Village, CO 80111-5002	20.65 %
State Street Target Retirement 2065 Fund-Class K MAC & CO A/C 471727 Attn: Mutual Fund Operations Room 151-1010 500 Grant Street Pittsburgh PA 15219-2502	30.17 %
National Financial Services LLC For the exclusive benefit of our customers Attn Mutual Funds Department 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	20.49 %

Name and Address	Percentage
MSCS Financial Services, LLC Matrix Trust Company Trustee FBO Eplan SVCS Group Trust P.O. Box 52129 Phoenix, Az 85072-2129	6.43 %
MAC & CO A/C 992756 Attn: Mutual Fund Operations Room 151-1010 500 Grant Street Pittsburgh PA 15219-2502	6.21 %
State Street Target Retirement 2065 Fund-Class R3 State Street Bank & Trust as Trustee and/or Cust FBO ADP Access Product 1 Lincoln St. Boston, MA 02111-2900	100.00 %
State Street Target Retirement 2070 Fund-Class I SSGA Private Funds LLC Attn Fund Services Team 1 Lincoln St Boston, MA 02111-2901	100.00 %
State Street Target Retirement 2070 Fund-Class K MAC & CO A/C 262554 Attn: Mutual Fund Operations Room 151-1010 500 Grant Street Pittsburgh PA 15219-2531	93.55 %
State Street Target Retirement 2070 Fund-Class K SSGA Private Funds LLC Attn Fund Services Team 1 Lincoln St Boston, MA 02111-2901	5.91 %
State Street Target Retirement 2070 Fund-Class R3 SSGA Private Funds LLC Attn Fund Services Team 1 Lincoln St Boston, MA 02111-2901	100.00 %
State Street Target Retirement Fund-Class I National Financial Services LLC For the exclusive benefit of our customers Attn Mutual Funds Department 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	94.66 %
State Street Target Retirement Fund-Class I MSCS Financial Services, LLC Matrix Trust Company Trustee FBO RCG LLC 401(K) Plan 717 17th Street Suite 1300 Denver, CO 80202-3304	5.34 %
State Street Target Retirement Fund-Class K National Financial Services Corporation For the Exclusive Benefit of Our Customers Attn Mutual Funds 4th FL 499 Washington Blvd Jersey City, NJ 07310-1995	37.10 %
State Street Target Retirement Fund-Class K Vanguard Fiduciary Trust CO FBO 401K Clients Attn: Investment Services P.O. Box 2600 VM L20 Valley Forge, PA 19482-2600	14.63 %

Name and Address	Percentage
State Street Target Retirement Fund-Class K DCGT as TTEE and/or CUST FBO PLIC Various Retirement Plans Omnibus Attn NPIO Trade Desk Attn NPIO Trade Desk 711 High Street Des Moines, IA 50392-0001	5.49 %
State Street Target Retirement Fund-Class R3 State Street Bank & Trust as Trustee and/or Cust FBO ADP Access Product 1 Lincoln St. Boston, MA 02111-2900	100.00 %

Investment Advisory and Other Services

Investment Advisory Agreement

SSGA FM is responsible for the investment management of the Funds pursuant to the Amended and Restated Investment Advisory Agreement dated November 17, 2015, as amended from time to time (the “Advisory Agreement”), by and between the Adviser and the Trust. The Adviser is a wholly-owned subsidiary of State Street Global Advisors, Inc., which itself is a wholly-owned subsidiary of State Street Corporation, a publicly held financial holding company. State Street is a wholly-owned subsidiary of State Street Corporation.

For the services provided under the Advisory Agreement, each Fund pays the Adviser a fee at an annual rate set forth below of the Fund's average daily net assets.

Fund	Fee Rate
Aggregate Bond Index Fund	0.025 %
Balanced Index Fund	0.05 %
Emerging Markets Equity Index Fund	0.08 %
Equity 500 Index Fund	0.02 %
Global All Cap Equity ex-U.S. Index Fund	0.06 %
Hedged International Developed Equity Index Fund	0.14 %
International Developed Equity Index Fund	0.11 %
Small/Mid Cap Equity Index Fund	0.03 %
Target Retirement 2025 Fund	0.05 %
Target Retirement 2030 Fund	0.05 %
Target Retirement 2035 Fund	0.05 %
Target Retirement 2040 Fund	0.05 %
Target Retirement 2045 Fund	0.05 %
Target Retirement 2050 Fund	0.05 %
Target Retirement 2055 Fund	0.05 %
Target Retirement 2060 Fund	0.05 %
Target Retirement 2065 Fund	0.05 %
Target Retirement 2070 Fund	0.05 %
Target Retirement Fund	0.05 %

Each Feeder Fund currently invests all of its assets in a related Portfolio, which has substantially similar investment strategies as the relevant Fund. The Equity 500 Index II Portfolio, Aggregate Bond Index Portfolio, Global All Cap Equity ex-U.S. Index Portfolio, and the Small/Mid Cap Equity Index Portfolio pay no investment advisory fees to SSGA FM.

For the Aggregate Bond Index Fund, the Aggregate Bond Index Portfolio, the Equity 500 Index Fund, the Equity 500 Index II Portfolio, the Global All Cap Equity ex-U.S. Index Fund, the Global All Cap Equity ex-U.S. Index Portfolio, the Small/Mid Cap Equity Index Fund, the Small/Mid Cap Equity Index Portfolio, the International Developed Index Fund, the Emerging Markets Equity Index Fund, and the Hedged International Developed Index Fund, the Adviser has contractually agreed to waive up to the portion of the advisory fee and/or expenses attributable to the Funds' or the Portfolios' acquired fund fees and expenses, excluding acquired fund fees and expenses derived from the Funds' or Portfolios' holdings in acquired funds for cash management purposes.

For the Hedged International Developed Equity Index Fund and the International Developed Equity Index Fund, the amount each Fund pays under its Investment Advisory Agreement is reduced by the amount of the advisory fee it bears indirectly through its investment in the International Developed Equity Index Portfolio. For the services provided under its Investment Advisory Agreement, the Portfolio pays the Adviser a management fee at the annual rate of 0.11% of the Portfolio's average daily net assets.

The Adviser and its affiliates may have deposit, loan and other commercial banking relationships with the issuers of obligations that may be purchased on behalf of the Funds, including outstanding loans to such issuers that could be repaid in whole or in part with the proceeds of securities so purchased. Such affiliates deal, trade and invest for their own accounts in such obligations and are among the leading dealers of various types of such obligations. The Adviser has informed the Funds that, in making its investment decisions, it will not obtain or use material non-public information in its possession or in the possession of any of its affiliates. In making investment recommendations for a Fund, the Adviser will not inquire or take into consideration whether an issuer of securities proposed for purchase or sale by the Fund is a customer of the Adviser, its parent or its subsidiaries or affiliates and, in dealing with its customers, the Adviser, its parent, subsidiaries and affiliates will not inquire or take into consideration whether securities of such customers were held by any fund managed by the Adviser or any such affiliate.

In certain instances, there may be securities that are suitable for a Fund as well as for one or more of the Adviser's other clients. Investment decisions for the Trust and for the Adviser's other clients are made with a view to achieving their respective investment objectives. It may develop that a particular security is bought or sold for only one client even though it might be held by, or bought or sold for, other clients. Likewise, a particular security may be bought for one or more clients when one or more clients are selling that same security. Some simultaneous transactions are inevitable when several clients receive investment advice from the same investment adviser, particularly when the same security is suitable for the investment objectives of more than one client. When two or more clients are simultaneously engaged in the purchase or sale of the same security, the securities are allocated among clients in a manner believed to be equitable to each. The Trust recognizes that in some cases this system could have a detrimental effect on the price or volume of the security as far as a Fund is concerned. However, it is believed that the ability of each Fund to participate in volume transactions will produce better executions for the Funds.

The advisory fees paid to SSGA FM for the last three fiscal years are as follows.

Fund	2024	2023	2022
Emerging Markets Equity Index Fund	$746,628	$846,898	$1,045,110
Hedged International Developed Equity Index Fund	$4,883,340	$4,570,952	$5,746,363
International Developed Equity Index Fund(1)	$—	$—	$—
Aggregate Bond Index Fund	$176,855	$184,362	$152,091
Balanced Index Fund	$51,920	$1,871	$—
Equity 500 Index Fund	$1,318,640	$841,011	$656,771
Global All Cap Equity ex-U.S. Index Fund	$1,025,865	$777,600	$670,847
Small/Mid Cap Equity Index Fund	$128,367	$132,436	$109,694
Target Retirement 2025 Fund	$997,741	$889,000	$817,148
Target Retirement 2030 Fund	$1,473,883	$1,184,698	$993,294
Target Retirement 2035 Fund	$1,438,015	$1,118,615	$905,628
Target Retirement 2040 Fund	$1,328,445	$1,014,793	$807,491
Target Retirement 2045 Fund	$1,209,630	$898,356	$686,487
Target Retirement 2050 Fund	$1,015,578	$722,183	$512,759
Target Retirement 2055 Fund	$745,288	$508,473	$337,699
Target Retirement 2060 Fund	$481,922	$300,756	$175,833
Target Retirement 2065 Fund	$139,767	$71,749	$31,222
Target Retirement 2070 Fund	$4	$—	$—
Target Retirement Fund	$334,163	$321,223	$306,217

(1)

The International Developed Equity Index Fund has not yet commenced operations.

Fund	2024	2023	2022
Aggregate Bond Index Fund	$1,088,471	$879,619	$780,471
Balanced Index Fund	$265,580	$52,334	$—
Emerging Markets Equity Index Fund	$906,256	$843,391	$1,207,827
Equity 500 Index Fund	$5,242,865	$3,528,078	$2,742,824
Global All Cap Equity ex-U.S. Index Fund	$3,032,584	$2,249,871	$1,814,506
Hedged International Developed Equity Index Fund	$5,232,730	$5,268,166	$6,539,343
International Developed Equity Index Fund(1)	$—	$—	$—
Small/Mid Cap Equity Index Fund	$557,350	$489,703	$458,467
Target Retirement 2025 Fund	$2,673,667	$2,359,531	$2,212,156
Target Retirement 2030 Fund	$3,003,126	$2,494,736	$2,130,378
Target Retirement 2035 Fund	$2,178,396	$1,909,785	$1,676,231
Target Retirement 2040 Fund	$1,755,250	$1,515,831	$1,338,529
Target Retirement 2045 Fund	$1,566,661	$1,405,992	$1,252,125
Target Retirement 2050 Fund	$1,408,155	$1,263,073	$1,085,967
Target Retirement 2055 Fund	$1,184,887	$1,015,829	$870,893
Target Retirement 2060 Fund	$1,000,235	$835,104	$699,178
Target Retirement 2065 Fund	$418,979	$337,606	$259,121
Target Retirement 2070 Fund	$16,353	$—	$—
Target Retirement Fund	$1,159,511	$1,095,438	$1,115,266

(1)

The International Developed Equity Index Fund has not yet commenced operations.

Total Annual Fund Operating Expense Waivers and Reimbursements. The Adviser has contractually agreed with the Trust, through April 30, 2026 to (1) waive advisory fees and/or (2) reimburse the Funds for expenses to the extent that Total Annual Fund Operating Expenses (subject to certain exclusions as described in each Fund's Prospectus) exceed the following percentage of average daily net assets on an annual basis with respect to the Funds.:

Fund	Expense Limitation
Aggregate Bond Index Fund	0.025 %
Balanced Index Fund	0.05 %
Emerging Markets Equity Index Fund	0.074 %
Equity 500 Index Fund	0.02 %
Global All Cap Equity ex-U.S. Index Fund	0.015 %
Hedged International Developed Equity Index Fund	0.15 %
International Developed Equity Index Fund	0.09 %
Small/Mid Cap Equity Index Fund	0.045 %
Target Retirement 2025 Fund	0.09 %
Target Retirement 2030 Fund	0.09 %
Target Retirement 2035 Fund	0.09 %
Target Retirement 2040 Fund	0.09 %
Target Retirement 2045 Fund	0.09 %
Target Retirement 2050 Fund	0.09 %
Target Retirement 2055 Fund	0.09 %
Target Retirement 2060 Fund	0.09 %
Target Retirement 2065 Fund	0.09 %
Target Retirement 2070 Fund	0.09 %
Target Retirement Fund	0.09 %

Administrator

SSGA FM serves as the administrator for the Funds pursuant to an Amended and Restated Administration Agreement. Under the Amended and Restated Administration Agreement, SSGA FM is obligated to continuously provide business management services to the Trust and the Funds and will generally, subject to the general oversight of the Trustees and except as otherwise provided in the Amended and Restated Administration Agreement, manage all of the business and affairs of the Trust. The nature and amount of services provided by SSGA FM under the Amended and Restated Administration Agreement may vary as between classes of shares of a Fund, and a Fund may pay fees to SSGA FM under that Agreement at different rates in respect of its different share classes. The Funds reimburse SSGA FM for certain out-of-pocket travel expenses of the CCO and compliance team incurred on the Funds' behalf.

As consideration for SSGA FM's services as administrator with respect to each Fund, SSGA FM receives a fee at the annual rate of 0.05% of the average daily net assets attributable to each class of shares of the Fund. The fees are accrued daily at the rate of 1/365th and payable monthly on the first business day of each month.

The administration fees paid to SSGA FM as the administrator for the last three fiscal years are set forth in the table below:

Fund	2024	2023	2022
Aggregate Bond Index Fund	$485,320	$368,725	$304,182
Balanced Index Fund	$51,920	$1,871	$—
Emerging Markets Equity Index Fund	$300,357	$302,463	$373,254
Equity 500 Index Fund	$3,296,601	$2,102,527	$1,641,927
Global All Cap Equity ex-U.S. Index Fund	$854,888	$648,000	$559,039
Hedged International Developed Equity Index Fund	$1,744,050	$1,632,483	$2,052,272
International Developed Equity Index Fund(1)	$—	$—	$—
Small/Mid Cap Equity Index Fund	$296,670	$220,726	$182,824
Target Retirement 2025 Fund	$997,741	$889,000	$817,148
Target Retirement 2030 Fund	$1,473,883	$1,184,698	$993,294
Target Retirement 2035 Fund	$1,438,015	$1,118,615	$905,628
Target Retirement 2040 Fund	$1,328,445	$1,014,793	$807,491
Target Retirement 2045 Fund	$1,209,630	$898,356	$686,487
Target Retirement 2050 Fund	$1,015,578	$722,183	$512,759
Target Retirement 2055 Fund	$745,288	$508,473	$337,699
Target Retirement 2060 Fund	$481,922	$300,756	$175,833
Target Retirement 2065 Fund	$139,767	$71,749	$31,222
Target Retirement 2070 Fund	$4	$—	$—
Target Retirement Fund	$334,163	$321,223	$306,217

(1)

The International Developed Equity Index Fund has not yet commenced operations.

SUB-ADMINISTRATOR, CUSTODY AND FUND ACCOUNTING

State Street receives an annual fee from the Adviser (payable monthly), as consideration for sub-administration services provided to each Fund, except for the Emerging Markets Equity Index Fund (the “Stand-Alone Fund”). As consideration for custody and fund accounting services, each Fund, except the Stand-Alone Fund, pays State Street an annual fee (payable monthly) based on the average monthly net assets of each Fund. As consideration for sub-administration, custody and fund accounting services provided to the Stand-Alone Fund, the Adviser and the Stand-Alone Fund each pays State Street a portion of the annual fee (payable monthly). Each Fund also pays State Street transaction and service fees for these services and reimburses State Street for out-of-pocket expenses.

The sub-administration (if applicable), custodian and fund accounting fees paid by certain Funds to State Street for the last three fiscal years are set forth in the table below.

Fund	2024	2023	2022
Aggregate Bond Index Fund	$36,365	$36,170	$36,379
Balanced Index Fund	$50,149	$2,572	$—
Emerging Markets Equity Index Fund	$462,778	$412,780	$688,528
Equity 500 Index Fund	$45,980	$49,074	$46,200
Global All Cap Equity ex-U.S. Index Fund	$36,329	$36,186	$36,249
Hedged International Developed Equity Index Fund	$93,576	$251,961	$187,846
International Developed Equity Index Fund(1)	$—	$—	$—
Small/Mid Cap Equity Index Fund	$36,342	$36,166	$36,296
Target Retirement 2025 Fund	$54,112	$51,214	$56,659
Target Retirement 2030 Fund	$53,715	$51,957	$56,188
Target Retirement 2035 Fund	$53,696	$51,658	$56,201
Target Retirement 2040 Fund	$53,434	$51,657	$55,858
Target Retirement 2045 Fund	$53,580	$51,602	$55,947
Target Retirement 2050 Fund	$53,287	$51,441	$56,453
Target Retirement 2055 Fund	$53,384	$51,623	$56,216
Target Retirement 2060 Fund	$53,645	$51,944	$56,404
Target Retirement 2065 Fund	$53,984	$54,343	$54,056
Target Retirment 2070 Fund	$1	$—	$—
Target Retirement Fund	$54,022	$53,323	$56,380

(1)

The International Developed Equity Index Fund has not yet commenced operations .

Transfer Agent and Dividend Paying Agent

SS&C GIDS, Inc. serves as the Transfer and Dividend Paying Agent. SS&C GIDS, Inc. is paid for the following annual account services and activities including but not limited to: establishment and maintenance of each shareholder's account; closing an account; acceptance and processing of trade orders; preparation and transmission of payments for dividends and distributions declared by each Fund; customer service support including receipt of correspondence and responding to shareholder and financial intermediary inquiries; investigation services; tax related support; financial intermediary commission and fee payment processing; and charges related to compliance and regulatory services.

Portfolio fees are allocated to each Fund based on the average NAV of each Fund and are billable on a monthly basis at the rate of 1/12 of the annual fee. SS&C GIDS, Inc. is reimbursed by each Fund for supplying certain out-of-pocket expenses including confirmation statements, investor statements, banking fees, postage, forms, audio response, telephone, records retention, customized programming/enhancements, reports, transcripts, microfilm, microfiche, and expenses incurred at the specific direction of the Fund. SS&C GIDS, Inc. principal business address is 2000 Crown Colony Drive, Quincy, MA 02169.

Securities Lending

The Fund's Board has approved each Fund's participation in a securities lending program. Under the securities lending program, each Fund has retained State Street to serve as the securities lending agent.

For the fiscal year ended December 31, 2024, the income earned by each Fund as well as the fees and/or compensation paid by each Fund (in dollars) pursuant to the Master Amended and Restated Securities Lending Authorization Agreement among SSGA Funds, State Street Institutional Investment Trust, and State Street Master Funds, each on behalf of its respective series, and State Street (the “Securities Lending Authorization Agreement”) were as follows:

	Gross income earned by the Fund from securities lending activities	Fees and/or compensation paid by the Fund for securities lending activities and related services						Aggregate fees and/or compensation paid by the Fund for securities lending activities and related services	Net income from securities lending activities
		Fees paid to State Street from a revenue split	Fees paid for any cash collateral management service (including fees deducted from a pooled cash collateral reinvestment vehicle) that are not included in a revenue split	Admini- strative fees not included in a revenue split	Indemnifi- cation fees not included in a revenue split	Rebate (paid to borrower)	Other fees not included in a revenue split		Net income from securities lending activities
Emerging Markets Equity Index Fund	$1,045,357	$44,825	$0	$0	$0	$895,924	$0	$940,749	$104,609
State Street Balanced Index Fund	$5,601,783	$549,327	$0	$0	$0	$5,052,456	$0	$5,601,783	$0
Target Retirement 2025 Fund	$211,323	$3,211	$1,323	$0	$0	$188,549	$0	$193,083	$18,240
Target Retirement 2030 Fund	$81,710	$1,705	$464	$0	$0	$64,200	$0	$66,368	$15,342
Target Retirement 2035 Fund	$257,544	$9,500	$0	$0	$0	$225,873	$0	$235,373	$22,171
Target Retirement 2040 Fund	$4,286	$16	$28	$0	$0	$4,055	$0	$4,099	$186
Target Retirement 2045 Fund	$403,912	$7,535	$0	$0	$0	$378,792	$0	$386,327	$17,586
Target Retirement 2050 Fund	$148	$40	$0	$0	$0	$0	$0	$40	$107
Target Retirement 2055 Fund	$759,117	$48,107	$0	$0	$0	$598,736	$0	$646,843	$112,273
Target Retirement Fund	$269,997	$8,486	$1,711	$0	$0	$240,000	$0	$250,198	$19,800

For the fiscal year ended December 31, 2024 State Street, acting as agent of the Funds, provided the following services to the Funds in connection with the Funds' securities lending activities: (i) locating borrowers among an approved list of prospective borrowers; (ii) monitoring the value of loaned securities, the value of collateral received and other lending parameters; (iii) seeking additional collateral, as necessary, from borrowers; (iv) receiving and holding collateral from borrowers, and facilitating the investment and reinvestment of all or substantially all cash collateral in an investment vehicle designated by the Funds; (v) returning collateral to borrowers; (vi) facilitating substitute dividend, interest, and other distribution payments to the Funds from borrowers; (vii) negotiating the terms of each loan of securities, including but not limited to the amount of any loan premium, and monitoring the terms of securities loan agreements with prospective borrowers for consistency with the requirements of the Funds' Securities Lending Authorization Agreement; (viii) selecting securities, including amounts (percentages), to be loaned; (ix) recordkeeping and accounting servicing; and (x) arranging for return of loaned securities to the Fund in accordance with the terms of the Securities Lending Authorization Agreement.

Code of Ethics

The Adviser, SSGA FD and the Trust have each adopted a code of ethics (the Trust's code being referred to herein as the “Code of Ethics”) under Rule 17j-1 of the 1940 Act. The Code of Ethics, by relying on the codes of the underlying service providers, permits personnel of the Funds' Adviser, Distributor and officers, subject to the provisions of the relevant code of ethics, to invest in securities, including securities that may be purchased or held by the Adviser or the Trust. Under the relevant code of ethics, all employees or officers who are deemed to be access persons (persons who have interaction with funds or accounts managed by the Adviser or SSGA FD as part of their job function) must pre-clear personal securities transactions. Each code of ethics is designed to ensure that employees conduct their personal securities transactions in a manner that does not create an actual or potential conflict of interest to the business or fiduciary responsibilities of the Trust's service providers or officers. In addition, the Code of Ethics establishes standards prohibiting the trading in or recommending of securities based on material, nonpublic information or the divulgence of such information to others.

Distributor

SSGA FD serves as the distributor of the Funds. SSGA FD is an indirect wholly-owned subsidiary of State Street Corporation. SSGA FD's mailing address is One Iron Street, Boston, MA 02210. The distribution expenses each Fund accrued to SSGA FD for the last three fiscal years are set forth in the table below.

Fund	2024	2023	2022
Aggregate Bond Index Fund
Class A Shares	$34,144	$38,081	$31,398
Equity 500 Index Fund
Administrative Shares	$262,375	$225,103	$269,012
Service Shares	$27,599	$19,367	$16,808
Class R Shares	$228,912	$174,113	$186,061
Class A Shares	$277,042	$208,809	$202,636
Global All Cap Equity ex-U.S. Index Fund
Class A Shares	$38,423	$33,008	$30,087
Small/Mid Cap Equity Index Fund
Class A Shares	$90,247	$76,442	$84,102
Target Retirement Fund	$10,125	$7,187	$6,133
Target Retirement 2025 Fund	$34,096	$29,389	$25,233
Target Retirement 2030 Fund	$82,395	$74,775	$61,735
Target Retirement 2035 Fund	$44,913	$35,154	$27,539
Target Retirement 2040 Fund	$69,680	$59,724	$52,513
Target Retirement 2045 Fund	$45,143	$33,454	$22,187
Target Retirement 2050 Fund	$61,810	$44,003	$30,049
Target Retirement 2055 Fund	$40,175	$26,548	$17,535
Target Retirement 2060 Fund	$17,883	$11,094	$6,056
Target Retirement 2065 Fund	$2,504	$886	$166
Target Retirement 2070 Fund	$7	$—	$—

Distribution Plan

To compensate SSGA FD for the services it provides and for the expenses it bears in connection with the distribution of shares of the Funds, SSGA FD will be entitled to receive any front-end sales load applicable to the sale of shares of the Fund. Each Fund may make payments from the assets attributable to certain classes of its shares to SSGA FD under a distribution plan adopted pursuant to Rule 12b-1 under the 1940 Act (the “Distribution Plan”). The Distribution Plan is a compensation plan that provides for payments at annual rates (based on average daily net assets) described below. Because Rule 12b-1 Fees are paid on an ongoing basis, they will increase the cost of your investment and may cost you more than paying other types of sales loads. The principal business address of SSGA FD is One Iron Street, Boston, MA 02210.

in effect with respect to a class of shares of a Fund only if such continuance is specifically approved at least annually by a vote of both a majority of the Board of Trustees of the Trust and a majority of the Qualified Distribution Plan Trustees. The Distribution Plan may not be amended to increase materially the amount of a Fund's permitted expenses thereunder without the approval of a majority of the outstanding shares of the affected share class and may not be materially amended in any case without a vote of the majority of both the Trustees and the Qualified Distribution Plan Trustees. As of December 31, 2024 none of the Independent Trustees had a direct or indirect financial interest in the operation of the Distribution Plan. The Distribution Plan calls for payments at an annual rate (based on each Fund's average net assets) as follows:

Class	Annual 12b-1 Fee
Administrative Shares	0.15 %
Service Shares	0.25 %
Class R Shares	0.60 %
Class A	0.25 %
Class I	None
Class K	None
Class R3	0.25 %

Payments to Financial Intermediaries

Financial intermediaries are firms that, for compensation, sell shares of mutual funds, including the Funds, and/or provide certain administrative and account maintenance services to mutual fund shareholders. Financial intermediaries may include, among others, brokers, financial planners or advisors, banks, and insurance companies. In some cases, a financial intermediary may hold its clients' Fund shares in nominee or street name. Shareholder services provided by a financial intermediary may (though they will not necessarily) include, among other things: processing and mailing trade confirmations, periodic statements, prospectuses, annual reports, semi-annual reports, shareholder notices, and other SEC-required communications; capturing and processing tax data; issuing and mailing dividend checks to shareholders who have selected cash distributions; preparing record date shareholder lists for proxy solicitations; collecting and posting distributions to shareholder accounts; and establishing and maintaining systematic withdrawals and automated investment plans and shareholder account registrations. Some portion of SSGA FD's payments to financial intermediaries will be made out of amounts received by SSGA FD under the Funds' Distribution Plans. In addition, the Funds may reimburse SSGA FD for payments SSGA FD makes to financial intermediaries that provide recordkeeping, shareholder servicing, sub-transfer agency, administrative and/or account maintenance services (collectively, “servicing”). The amount of the reimbursement for servicing compensation and the manner in which it is calculated are reviewed by the Trustees periodically.

The compensation paid by SSGA FD to a financial intermediary may be paid continually over time, during the period when the intermediary's clients hold investments in the Funds. The compensation to financial intermediaries may include networking fees and account-based fees. The amount of continuing compensation paid by SSGA FD to different financial intermediaries varies. In the case of most financial intermediaries, compensation for servicing in excess of any amount covered by payments under a Distribution Plan is generally paid at an annual rate of 0.10% – 0.20% of the aggregate average daily NAV of Fund shares held by that financial intermediary's customers, although in some cases the compensation may be paid at higher annual rates (which may, but will not necessarily, reflect enhanced or additional services provided by the financial intermediary). SSGA FD and its affiliates (including SSGA FM), at their own expense and out of their own assets, may also provide compensation to financial intermediaries in connection with sales of the Funds' shares or the servicing of shareholders or shareholder accounts by financial intermediaries. Such compensation may include, but is not limited to, ongoing payments, financial assistance to financial intermediaries in connection with conferences, sales, or training programs for their employees, seminars for the public, advertising or sales campaigns, or other financial intermediary-sponsored special events. In some instances, this compensation may be made available only to certain financial intermediaries whose representatives have sold or are expected to sell significant amounts of shares. Financial intermediaries may not use sales of the Funds' shares to qualify for this compensation to the extent prohibited

by the laws or rules of any state or any self-regulatory agency, such as FINRA. The level of payments made to a financial intermediary in any given year will vary and, in the case of most financial intermediaries, will not exceed 0.20% of the value of assets attributable to the financial intermediary invested in shares of funds in the SSGA FM-fund complex. In certain cases, the payments described in the preceding sentence are subject to minimum payment levels.

Because the Funds pay distribution, service and other fees for the sale of their shares and for services provided to shareholders out of the Funds' assets on an ongoing basis, over time those fees will increase the cost of an investment in a Fund.

For the fiscal year ended December 31, 2024, the Funds have been informed by SSGA FD that the following expenditures were made using the amounts each Fund's Class A, Administrative, Service and Class R shares paid under its Rule 12b-1 Distribution Plan:

Fund	Advertising	Printing	Compensation to Dealers	Compensation to Sales Personnel	Other*
State Street Aggregate Bond Index Fund	$0	$0	$33,932	$312	$334
State Street Equity 500 Index Fund	$2	$0	$796,037	$7,658	$8,197
State Street Global All Cap Equity ex-U.S. Index Fund	$0	$0	$38,457	$351	$376
State Street Small/Mid Cap Equity Index Fund	$0	$0	$89,896	$825	$883
State Street Target Retirement 2020 Fund (R3 Class)	$0	$0	$29,659	$311	$281
State Street Target Retirement 2025 Fund (R3 Class)	$0	$0	$34,094	$357	$322
State Street Target Retirement 2030 Fund (R3 Class)	$0	$0	$82,399	$863	$779
State Street Target Retirement 2035 Fund (R3 Class)	$0	$0	$44,972	$470	$424
State Street Target Retirement 2040 Fund (R3 Class)	$0	$0	$69,715	$730	$659
State Street Target Retirement 2045 Fund (R3 Class)	$0	$0	$45,177	$473	$427
State Street Target Retirement 2050 Fund (R3 Class)	$0	$0	$61,819	$647	$584
State Street Target Retirement 2055 Fund (R3 Class)	$0	$0	$40,283	$421	$380
State Street Target Retirement 2060 Fund (R3 Class)	$0	$0	$17,914	$187	$169
State Street Target Retirement 2065 Fund (R3 Class)	$0	$0	$2,518	$26	$24
State Street Target Retirement 2070 Fund (R3 Class)	$0	$0	$0	$0	$0
State Street Target Retirement Fund (R3 Class)	$0	$0	$10,146	$106	$96

Includes such items as compensation for travel, conferences and seminars for staff, professional fees, technology, services, and overhead (including space/facilities and management).

•ADP Broker Dealer, Inc.

•Ariel Distributors Inc.

•Ascensus Broker Dealer Services, LLC

•BMO Capital Markets Corp.

•Blaylock Van, LLC

•Cabrera Capital Markets LLC

•Charles Schwab & Co., Inc.

•Citibank, N.A.

•Computershare Trust Company, N.A.

•Commerce Bank

•Empower Financial Services, Inc.

•FIS Brokerage & Securities Services LLC

•State Street Brokerage Services, Inc.

•Goldman Sachs & Co

•Institutional Cash Distributors, LLC

•J.P. Morgan Securities LLC

•JP Morgan Chase bank, N.A.

•Lasalle Street Securities

•LPL Financial Corporation

•Merrill Lynch Pierce Fenner & Smith

•Mid-Atlantic Capital Corporation

•Morgan Stanley Smith Barney LLC

•MSCS Financial Services LLC

•MUFG Union Bank, National Association

•National Financial Services, LLC

•Pershing LLC

•PNC Capital Markets, LLC

•RBC Capital Markets, LLC

•Reliance Trust Company

•Securities Finance Trust Company

•SEI Trust Company

•State Street Bank and Trust Company – Global Services Business Units

•State Street Global Markets, LLC

•TD Prime Services LLC

•The Bank of New York Mellon

•Treasury Curve

•UBS Financial Services Inc.

•US Bank, National Association

•Valic Financial Advisors, Inc.

•Wells Fargo Bank, N.A.

•Wells Fargo Clearing Services

•Wells Fargo Securities LLC

Counsel and Independent Registered Public Accounting Firm

Portfolio Managers

The Adviser manages the Funds using a team of investment professionals. The following table lists the number and types of accounts managed by each of the key professionals involved in the day-to-day portfolio management for each Fund and assets under management in those accounts. The total number of accounts and assets have been allocated to each respective manager. Therefore, some accounts and assets have been counted twice.

Portfolio Manager	Registered Investment Company Accounts	Assets Managed (billions)	Other Pooled Investment Vehicle Accounts	Assets Managed (billions)	Other Accounts	Assets Managed (billions)	Total Assets Managed (billions)
Karl Schneider	131	$1,300.02	366	$959.02	476	$561.50	$2,820.70
David Chin	131	$1,300.02	366	$959.02	476	$561.50	$2,820.70
Thomas Coleman	131	$1,300.02	366	$959.02	476	$561.50	$2,820.70
Ted Janowsky	131	$1,300.02	366	$959.02	476	$561.50	$2,820.70
Amy Scofield	131	$1,300.02	366	$959.02	476	$561.50	$2,820.70
Olga Winner	131	$1,052.26	363	$959.02	476	$561.50	$2,820.70
Marc DiCosimo	48	$147.48	126	$211.46	162	$117.95	$476.89
Joanna Madden	48	$147.48	126	$211.46	162	$117.95	$476.89
Michael Przygoda	48	$147.48	126	$211.46	162	$117.95	$476.89
Leo Law	8	$5.46	177	$289.24	173 (1)	$137.77 (1)	$432.50
Michael Narkiewicz	8	$5.46	177	$289.24	173 (1)	$137.77 (1)	$432.50
Seamus Quinn	8	$5.46	177	$289.24	173 (1)	$137.77 (1)	$432.50
(1) Includes 3 accounts (totaling $263.42 million in assets under management) with performance-based fees.

None of the portfolio managers listed above beneficially owned shares of any Fund as of December 31, 2024.

A portfolio manager that has responsibility for managing more than one account may be subject to potential conflicts of interest because he or she is responsible for other accounts in addition to the Funds. Those conflicts could include preferential treatment of one account over others in terms of: (a) the portfolio manager's execution of different investment strategies for various accounts; or (b) the allocation of resources or of investment opportunities.

Portfolio managers may manage numerous accounts for multiple clients. These accounts may include registered investment companies, other types of pooled accounts (e.g., collective investment funds), and separate accounts (i.e., accounts managed on behalf of individuals or public or private institutions). Portfolio managers make investment decisions for each account based on the investment objectives and policies and other relevant investment considerations applicable to that portfolio. A potential conflict of interest may arise as a result of a portfolio manager's responsibility for multiple accounts with similar investment guidelines. Under these circumstances, a potential investment may be suitable for more than one of the portfolio manager's accounts, but the quantity of the investment available for purchase is less than the aggregate amount the accounts would ideally allocate to the opportunity. Similar conflicts may arise when multiple accounts seek to dispose of the same investment. The portfolio managers may also manage accounts whose objectives and policies differ from that of the Funds. These differences may be such that under certain circumstances, trading activity appropriate for one account managed by the portfolio manager may have adverse consequences for another account managed by the portfolio manager. For example, an account may sell a significant position in a security, which could cause the market price of that security to decrease, while a Fund maintained its position in that security.

A potential conflict may arise when the portfolio managers are responsible for accounts that have different advisory fees—the difference in fees could create an incentive for the portfolio manager to favor one account over another, for example, in terms of access to investment opportunities. This conflict may be heightened if an account is subject to a performance-based fee, as applicable. Another potential conflict may arise when the portfolio manager has a personal investment in one or more accounts that participate in transactions with other accounts. His or her personal investment(s) may create an incentive for the portfolio manager to favor one account over another. The Adviser has adopted policies and procedures reasonably designed to address these potential material conflicts. For instance, portfolio managers are normally responsible for all accounts within a certain investment discipline and do not, absent special circumstances, differentiate among the various accounts when allocating resources. Additionally, the Adviser and its advisory affiliates have processes

and procedures for allocating investment opportunities among portfolios that are designed to provide a fair and equitable allocation. With respect to conflicts arising from personal investments, all employees, including portfolio managers, must comply with personal trading controls established by each of the Adviser's and Trust's Code of Ethics.

SSGA's culture is complemented and reinforced by a total rewards strategy that is based on a pay for performance philosophy which seeks to offer a competitive pay mix of base salary, benefits, cash incentives and deferred compensation.

Salary is based on a number of factors, including external benchmarking data and market trends, and performance both at the business and individual level. SSGA's Global Human Resources department regularly participates in compensation surveys in order to provide SSGA with market-based compensation information that helps support individual pay decisions.

Additionally, subject to State Street and SSGA business results, an incentive pool is allocated to SSGA to reward its employees. The size of the incentive pool for most business units is based on the firm's overall profitability and other factors, including performance against risk-related goals. For most SSGA investment teams, SSGA recognizes and rewards performance by linking annual incentive decisions for investment teams to the firm's or business unit's profitability and business unit investment performance over a multi-year period.

Incentive pool funding for most active investment teams is driven in part by the post-tax investment performance of fund(s) managed by the team versus the return levels of the benchmark index(es) of the fund(s) on a one-, three- and, in some cases, five-year basis. For most active investment teams, a material portion of incentive compensation for senior staff is deferred over a four-year period into the SSGA Long-Term Incentive (“SSGA LTI”) program. For these teams, The SSGA LTI program indexes the performance of these deferred awards against the post-tax investment performance of fund(s) managed by the team. This is intended to align our investment team's compensation with client interests, both through annual incentive compensation awards and through the long-term value of deferred awards in the SSGA LTI program.

For the index equity investment team, incentive pool funding is driven in part by the post-tax 1 and 3-year tracking error of the funds managed by the team against the benchmark indexes of the funds.

The discretionary allocation of the incentive pool to the business units within SSGA is influenced by market-based compensation data, as well as the overall performance of each business unit. Individual compensation decisions are made by the employee's manager, in conjunction with the senior management of the employee's business unit. These decisions are based on the overall performance of the employee and, as mentioned above, on the performance of the firm and business unit. Depending on the job level, a portion of the annual incentive may be awarded in deferred compensation, which may include cash and/or Deferred Stock Awards (State Street stock), which typically vest over a four-year period. This helps to retain staff and further aligns SSGA employees' interests with SSGA clients' and shareholders' long-term interests.

SSGA recognizes and rewards outstanding performance by:

•Promoting employee ownership to connect employees directly to the company's success.

•Using rewards to reinforce mission, vision, values and business strategy.

•Seeking to recognize and preserve the firm's unique culture and team orientation.

•Providing all employees the opportunity to share in the success of SSGA.

Brokerage Allocation and Other Practices

Feeder Funds (and the Hedged International Developed Equity Index Fund)

Each Feeder Fund invests all, and the Hedged International Developed Equity Index Fund invests substantially all, of its investable assets in a corresponding Portfolio and therefore does not directly incur transactional costs for purchases and sales of portfolio investments (except in the case of Hedged International Developed Equity Index Fund's currency hedging and related positions). The Funds generally purchase and redeem shares of the corresponding Portfolio each day depending on the number of shares of such Fund purchased or redeemed by investors on that day. Shares of the Portfolios are available for purchase by the Funds at their NAV without any sales charges, transaction fees, or brokerage commissions being charged.

•Prompt and reliable execution;

•The competitiveness of commission rates and spreads, if applicable;

•The financial strength, stability and/or reputation of the trading counterparty;

•Local laws, regulations or restrictions;

•The ability of the trading counterparty to maintain confidentiality;

•The availability and capability of execution venues, including electronic communications networks for trading and execution management systems made available to Adviser;

•Market share;

•Liquidity;

•Price;

•Execution related costs;

•History of execution of orders;

•Likelihood of execution and settlement;

•Order size and nature;

•Clearance and settlement capabilities, especially in high volatility market environments;

•Availability of lendable securities;

•Sophistication of the trading counterparty's trading capabilities and infrastructure/facilities;

•The operational efficiency with which transactions are processed and cleared, taking into account the order size and complexity;

•Speed and responsiveness to the Adviser;

•Access to secondary markets;

•Counterparty exposure; and

Consequently, the Adviser may cause a client to pay a trading counterparty more than another trading counterparty might have charged for the same transaction in recognition of the value and quality of the brokerage services provided. The following matters may influence the relative importance that the Adviser places upon the relevant factors:

(i)

The nature and characteristics of the order or transaction. For example, size of order, market impact of order, limits, or other instructions relating to the order;

(ii)

(iii)

The characteristics of the execution venues to which that order can be directed, if relevant. For example, availability and capabilities of electronic trading systems;

(iv)

(v)

Any other circumstances that the Adviser believes are relevant at the time.

The process by which trading counterparties are selected to effect transactions is designed to exclude consideration of the sales efforts conducted by broker-dealers in relation to the Funds.

The brokerage commissions paid by the Funds for the last three fiscal years are shown below:

Fund	2024	2023	2022
Aggregate Bond Index Fund	$0	$0	$ —
Balanced Index Fund	$8,819	$393	$ —
Emerging Markets Equity Index Fund	$64,345	$69,829	$219,439
Equity 500 Index Fund	$0	$0	$ —
Global All Cap Equity ex-U.S. Index Fund	$0	$0	$ —
Hedged International Developed Equity Index Fund	$49,606	$89,592	$90,876
Small/Mid Cap Equity Index Fund	$0	$0	$ —
Target Retirement 2025 Fund	$112,342	$102,346	$74,386
Target Retirement 2030 Fund	$106,197	$145,686	$64,035
Target Retirement 2035 Fund	$46,364	$96,790	$31,969
Target Retirement 2040 Fund	$36,111	$93,062	$28,360
Target Retirement 2045 Fund	$40,823	$74,395	$25,822
Target Retirement 2050 Fund	$42,963	$64,299	$20,081
Target Retirement 2055 Fund	$22,986	$42,771	$15,393
Target Retirement 2060 Fund	$19,171	$28,160	$9,091
Target Retirement 2065 Fund	$8,054	$7,284	$2,406
Target Retirement 2070 Fund	$27	$ —	$ —
Target Retirement Fund	$56,964	$30,805	$37,882

The decrease in brokerage commissions paid by the Emerging Markets Equity Index Fund for the fiscal year ended December 31, 2023 as compared to the fiscal year ended December 31, 2022 was generally due to a decrease in trading activity.

The brokerage commission fees paid by the International Developed Equity Index Fund have been omitted because the Fund had not commenced investment operations as of December 31, 2024.

Securities of “Regular Broker-Dealer.” Each Trust is required to identify any securities of its “regular brokers and dealers” (as such term is defined in the 1940 Act) which it may hold at the close of its most recent fiscal year. “Regular brokers or dealers” of the Trust are the ten brokers or dealers that, during the most recent fiscal year: (i) received the greatest dollar amounts of brokerage commissions from the Trust's portfolio transactions; (ii) engaged as principal in the largest dollar amounts of portfolio transactions of the Trust; or (iii) sold the largest dollar amounts of the Trust's shares.

The Trust's holdings in Securities of Regular Broker-Dealers as of December 31, 2024 are as follows:

UBS AG	$9,787,504
ICICI Bank Ltd.	$5,992,668
Itau International Securities Inc.	$2,474,147
KB Financial Group, Inc.	$1,613,365
Credicorp Ltd.	$953,264
Absa Group Ltd.	$658,484
Santander Securities LLC	$578,271
J.P. Morgan Securities LLC	$139,652
Bank of America Corp.	$64,141
Goldman Sachs Group, Inc.	$35,491

Portfolio turnover may vary from year to year, as well as within a year. High turnover rates are likely to result in comparatively greater brokerage expenses or transaction costs. The overall reasonableness of brokerage commissions and transaction costs is evaluated by the Adviser based upon its knowledge of available information as to the general level of commissions and transaction costs paid by other institutional investors for comparable services.

Declaration of Trust, Capital Stock and Other Information

Capitalization

Declaration of Trust

The Declaration of Trust of the Trust provides that the Trust may redeem shares of a Fund at the redemption price that would apply if the share redemption were initiated by a shareholder. It is the policy of the Trust that, except upon such conditions as may from time to time be set forth in the then current prospectus of the Trust or to facilitate the Trust's or a Fund's compliance with applicable law or regulation, the Trust would not initiate a redemption of shares unless it were to determine that failing to do so may have a substantial adverse consequence for a Fund or the Trust.

The Trust's Declaration of Trust provides that a Trustee who is not an “interested person” (as defined in the 1940 Act) of the Trust will be deemed independent and disinterested with respect to any demand made in connection with a derivative action or proceeding. It is the policy of the Trust that it will not assert that provision to preclude a shareholder from claiming that a trustee is not independent or disinterested with respect to any demand made in connection with a derivative action or proceeding; provided, however, that the foregoing policy will not prevent the Trust from asserting applicable law (including Section 2B of Chapter 182 of the Massachusetts General Laws) to preclude a shareholder from claiming that a trustee is not independent or disinterested with respect to any demand made in connection with a derivative action or proceeding.

The Trust will not deviate from the foregoing policies in a manner that adversely affects the rights of shareholders of a Fund without the approval of “a vote of a majority of the outstanding voting securities” (as defined in the 1940 Act) of such Fund.

Voting

Each investor is entitled to a vote in proportion to the number of Fund shares it owns. Shares do not have cumulative voting rights in the election of Trustees, and investors holding more than 50% of the aggregate outstanding shares in the Trust may elect all of the Trustees if they choose to do so. The Trust is not required and has no current intention to hold annual meetings of investors but the Trust will hold special meetings of shareholders when in the judgment of the Trustees it is necessary or desirable to submit matters for a shareholder vote.

Massachusetts Business Trust

loss to which the shareholder may become subject by reason of being or having been a shareholder of that series and for reimbursement of the shareholder for all expense arising from such liability. Thus, the risk of a shareholder incurring financial loss on account of shareholder liability should be limited to circumstances in which the series would be unable to meet its obligations.

Pricing of Shares

Multiple-class funds do not have a single share price. Rather, each class has a share price, called its NAV. The price per share for each class of each Fund is determined each business day (unless otherwise noted) at the close of the New York Stock Exchange (“NYSE”) (ordinarily 4:00 p.m. Eastern time).

The Funds' securities will be valued pursuant to guidelines established by the Board of Trustees.

Taxation of the Funds

Each of the Index Funds (other than the Emerging Markets Equity Index Fund) invests substantially all of its assets in the corresponding Portfolio, and each of the Target Retirement Funds invests in the Underlying Funds, and so substantially all of each such Fund's income will result from distributions or deemed distributions, or allocations, from the corresponding Portfolio or Underlying Funds, as the case may be. Therefore, as applicable, references to the U.S. federal income tax treatment of these Funds, including to the assets owned and the income earned by these Funds, will be to, or will include, such treatment of the corresponding Portfolio or Underlying Funds, and, as applicable, the assets owned and the income earned by the corresponding Portfolio or Underlying Funds. See “Tax Considerations Applicable to Funds Investing in Portfolios Treated as Partnerships” and “Tax Considerations Applicable to Funds Investing in Portfolios or Underlying Funds Treated as RICs” below for further information.

Special tax rules apply to investments through defined contribution plans and other tax-qualified plans or tax-advantaged arrangements. Shareholders should consult their tax advisers to determine the suitability of shares of a Fund as an investment through such plans and arrangements and the precise effect of an investment on their particular tax situations.

Qualification as a Regulated Investment Company

Each Fund has elected to be treated as a RIC under Subchapter M of the Code and intends each year to qualify and be eligible to be treated as such. In order to qualify for the special tax treatment accorded RICs and their shareholders, each Fund must, among other things, (a) derive at least 90% of its gross income for each taxable year from (i) dividends, interest, payments with respect to certain securities loans, gains from the sale of securities or foreign currencies, or other income (including but not limited to gains from options, futures or forward contracts) derived with respect to its business of investing in such stock, securities or currencies and (ii) net income derived from interests in “qualified publicly traded partnerships” (as defined below); (b) diversify its holdings so that, at the end of each quarter of the Fund's taxable year, (i) at least 50% of the value of the Fund's total assets consists of cash and cash items (including receivables), U.S. Government securities, securities of other RICs, and other securities limited in respect of any one issuer to a value not greater than 5% of the value of the Fund's total assets and no more than 10% of the outstanding voting securities of such issuer, and (ii) no more than 25% of its assets are invested, including through corporations in which the Fund owns a 20% or more voting stock interest, (x) in the securities (other than those of the U.S. Government or other RICs) of any one issuer or of two or more issuers which the Fund controls and which are engaged in the same, similar or related trades and

businesses, or (y) in the securities of one or more qualified publicly traded partnerships (as defined below); and (c) distribute with respect to each taxable year at least 90% of the sum of its investment company taxable income (as that term is defined in the Code without regard to the deduction for dividends paid — generally taxable ordinary income and the excess, if any, of net short-term capital gains over net long-term capital losses) and net tax-exempt income, for such year.

In general, for purposes of the 90% gross income requirement described in (a) above, income derived from a partnership will be treated as qualifying income only to the extent such income is attributable to items of income of the partnership which would be qualifying income if realized directly by the RIC. However, 100% of the net income derived from an interest in a “qualified publicly traded partnership” (a partnership (x) the interests in which are traded on an established securities market or are readily tradable on a secondary market or the substantial equivalent thereof, and (y) that derives less than 90% of its income from the qualifying income described in section (a)(i) of the preceding paragraph), will be treated as qualifying income. In general, such entities will be treated as partnerships for U.S. federal income tax purposes, because they meet the passive income requirement under Code section 7704(c)(2). Further, although U.S. in general the passive loss rules of the Code do not apply to RICs, such rules do apply to a RIC with respect to items attributable to an interest in a qualified publicly traded partnership.

If a Fund qualifies as a RIC that is accorded special tax treatment, the Fund will not be subject to U.S. federal income tax on income or gains distributed in a timely manner to its shareholders in the form of dividends (including Capital Gain Dividends, as defined below). If a Fund were to fail to meet the income, diversification or distribution test described above, the Fund could in some cases cure such failure, including by paying a Fund-level tax, paying interest or disposing of certain assets. If such Fund were ineligible to or otherwise did not cure such failure for any year, or if such Fund were otherwise to fail to qualify as a RIC accorded special tax treatment in any taxable year, the Fund would be subject to tax at the Fund level on its taxable income at corporate rates, and all distributions from earnings and profits, including any distributions of net tax-exempt income (if any) and net capital gains ( as defined below), would be taxable to shareholders as ordinary income. Some portions of such distributions may be eligible for the dividends-received deduction in the case of corporate shareholders and may be eligible to be treated as “qualified dividend income” in the case of shareholders taxed as individuals, provided, in both cases, the shareholder meets certain holding period and other requirements in respect of a Fund's shares (each as described below). In addition, a Fund could be required to recognize unrealized gains, pay substantial taxes and interest and make substantial distributions before re-qualifying as a RIC that is accorded special tax treatment.

October 31 or, if there is no such loss, the net long-term capital loss or net short-term capital loss attributable to any such portion of the taxable year) or late-year ordinary loss (generally, the sum of its (i) net ordinary loss, if any, from the sale, exchange or other taxable disposition of property, attributable to the portion, if any, of the taxable year after October 31, and its (ii) other net ordinary loss, if any, attributable to the portion, if any, of the taxable year after December 31) as if incurred in the succeeding taxable year.

If a Fund were to fail to distribute in a calendar year at least an amount equal, in general, to the sum of 98% of its ordinary income for such year and 98.2% of its capital gain net income for the one-year period ending October 31 of such year (or November 30 or December 31, if the Fund is eligible to elect and so elects), plus any such amounts retained from the prior year, the Fund would be subject to a nondeductible 4% excise tax on the undistributed amounts. For purposes of the required excise tax distribution, a RIC's ordinary gains and losses from the sale, exchange or other taxable disposition of property that would otherwise be taken into account after October 31 of a calendar year (or November 30, if the Fund makes the election referred to above) generally are treated as arising on January 1 of the following calendar year; in the case of a Fund with a December 31 year end that makes the election described above, no such gains or losses will be so treated. Also, for these purposes, a Fund will be treated as having distributed any amount on which it is subject to corporate income tax for the taxable year ending within the calendar year. Each Fund intends generally to make distributions sufficient to avoid imposition of the excise tax, although there can be no assurance that it will be able to do so. Distributions declared by a Fund during October, November and December to shareholders of record on a date in any such month and paid by the Fund during the following January will be treated for federal tax purposes as paid by the Fund and received by shareholders on December 31 of the year in which declared.

Taxation of Distributions Received by Shareholders

For U.S. federal income tax purposes, distributions of investment income are generally taxable to shareholders as ordinary income. Taxes on distributions of capital gains are determined by how long a Fund owned (or is deemed to have owned) the investments that generated them, rather than how long a shareholder has owned his or her Fund shares. In general, a Fund will recognize long-term capital gain or loss on the disposition of assets the Fund has owned (or is deemed to have owned) for more than one year, and short-term capital gain or loss on the disposition of investments the Fund has owned (or is deemed to have owned) for one year or less. Distributions of net-capital gain (that is, the excess of net long-term capital gain over net short-term capital loss) that are properly reported by a Fund as capital gain dividends (“Capital Gain Dividends”) generally will be taxable to a shareholder receiving such distributions as long-term capital gains includible in net capital gain and taxed to individuals at reduced rates relative to ordinary income. Distributions from capital gains are generally made after applying any available capital loss carryforwards. The IRS and the Department of the Treasury have issued regulations that impose special rules in respect of Capital Gain Dividends received through partnership interests constituting “applicable partnership interests” under Section 1061 of the Code. Distributions of net short-term capital gain (as reduced by any net long-term capital loss for the taxable year) will be taxable to shareholders as ordinary income. Distributions of investment income properly reported by a Fund and, in the case of a Fund investing in a Portfolio treated as a RIC, the Portfolio, as derived from “qualified dividend income” will be taxed in the hands of individuals at the rates applicable to net capital gain, provided holding period and other requirements are met at each of the shareholder, the Portfolio and, in the case of a Fund investing in a Portfolio treated as a RIC, the Fund level. The Aggregate Bond Index Fund does not expect its distributions to be derived from qualified dividend income.

Shareholders of a Fund will be subject to U.S. federal income taxes as described herein on distributions made by the Fund whether received in cash or reinvested in additional shares of the Fund.

Distributions with respect to a Fund's shares are generally subject to U.S. federal income tax as described herein to the extent they do not exceed the Fund's realized income and gains, even though such distributions may economically represent a return of a particular shareholder's investment. Such distributions are likely to occur in respect of shares purchased at a time when a Fund's NAV includes either unrealized gains, or realized but undistributed income or gains that were therefore included in the price the shareholder paid. Such distributions may reduce the fair market value of the Fund's shares below the shareholder's cost basis in those shares. As described above, a Fund is required to distribute realized income and gains regardless of whether the Fund's NAV also reflects unrealized losses.

In order for some portion of the dividends received by a Fund shareholder to be “qualified dividend income,” the Fund or corresponding Portfolio must meet holding period and other requirements with respect to the dividend-paying stocks held by the Fund or Portfolio, the shareholder must meet holding period and other requirements with respect to the Fund's shares, and in the case of a Fund investing in a Portfolio treated as a RIC, the Fund must meet holding period and other requirements with respect to its shares in the Portfolio. In general, a dividend will not be treated as qualified dividend income (at any of the Portfolio, Fund or shareholder level, as applicable) (a) if the dividend is received with respect to any share of stock held for fewer than 61 days during the 121-day period beginning on the date that is 60 days before the date on which such share becomes ex-dividend with respect to such dividend (or, in the case of certain preferred stock, 91 days during the 181-day period beginning 90 days before such date), (b) to the extent that the recipient is under an obligation (whether pursuant to a short sale or otherwise) to make related payments with respect to positions in substantially similar or related property, (c) if the recipient elects to have the dividend income treated as investment income for purposes of the limitation on deductibility of investment interest, or (d) if the dividend is received from a foreign corporation that is (i) not eligible for the benefits of a comprehensive income tax treaty with the United States (with the exception of dividends paid on stock of such a foreign corporation readily tradable on an established securities market in the United States) or (ii) treated as a passive foreign investment company.

In general, distributions of investment income properly reported by a Fund as derived from qualified dividend income will be treated as qualified dividend income in the hands of a shareholder taxed as an individual, provided the shareholder meets the holding period and other requirements described above with respect to the Fund's shares. If the aggregate qualified dividends (a) received by a Fund (including from a Portfolio that is treated as a RIC) or (b) allocated to a Fund by a Portfolio that is treated as a partnership, during any taxable year are 95% or more of the Fund's gross income (excluding net long-term capital gain over net short-term capital loss), then 100% of the Fund's dividends (other than dividends properly reported as Capital Gain Dividends) will be eligible to be treated as qualified dividend income.

In general, dividends of net investment income received by corporate shareholders of a Fund will qualify for the dividends-received deduction generally available to corporations to the extent of the amount of eligible dividends (a) received by a Fund from domestic corporations (including a corresponding Portfolio that is treated as a RIC) or (b) allocated to a Fund by a corresponding Portfolio that is treated as a partnership for the taxable year. A dividend will not be treated as a dividend eligible for the dividends-received deduction (at any of the Portfolio, Fund or shareholder level, as applicable) (a) if it has been received with respect to any share of stock that the Fund or Portfolio has held for less than 46 days (91 days in the case of certain preferred stock) during the 91-day period beginning on the date which is 45 days before the date on which such share becomes ex-dividend with respect to such dividend (during the 181-day period beginning 90 days before such date in the case of certain preferred stock) or (b) to the extent that the Fund or Portfolio is under an obligation (pursuant to a short sale or otherwise) to make related payments with respect to positions in substantially similar or related property. Moreover, a Fund that invests in a corresponding Portfolio that is treated as a RIC must meet similar requirements with respect to its shares of the corresponding Portfolio. Finally, the dividends-received deduction may otherwise be disallowed or reduced (x) if the corporate shareholder fails to satisfy the foregoing requirements with respect to its shares of the Fund or (y) by application of various provisions of the Code (for instance, the dividends-received deduction is reduced in the case of a dividend received on debt-financed portfolio stock (generally, stock acquired with borrowed funds)). The Aggregate Bond Index Fund does not expect Fund distributions to be eligible for the dividends-received deduction.

Distributions by a Portfolio to its shareholders that the Portfolio properly reports as “Section 199A dividends,” as defined and subject to certain conditions described below, are treated as qualified REIT dividends in the hands of non-corporate shareholders. Non-corporate shareholders are permitted a U.S. federal income tax deduction equal to 20% of qualified REIT dividends received by them, subject to certain limitations. Currently, eligible non-corporate shareholders can claim the deduction for tax years beginning after December 31, 2017, and ending on or before December 31, 2025. Very generally, a “Section 199A dividend” is any dividend or portion thereof that is attributable to certain dividends received by a RIC from REITs (as defined below), to the extent such dividends are properly reported as such by the RIC in a written notice to its shareholders. A Section 199A dividend is treated as a qualified REIT dividend only if the shareholder receiving such dividend holds the dividend-paying RIC shares for at least 46 days of the 91-day period beginning 45 days before the shares become ex-dividend, and is not under an obligation to make related payments with respect to a position in substantially similar or related property. A Portfolio is permitted to report such part of its dividends as Section 199A dividends as are eligible, but is not required to do so.

If a Fund holds, directly or indirectly, one or more “tax credit bonds” issued on or before December 31, 2017, on one or more applicable dates during a taxable year, the Fund may elect to permit its shareholders to claim a tax credit on their income tax returns equal to each shareholder's proportionate share of tax credits from the bond otherwise allowed to the Fund. In such a case, a shareholder will be deemed to receive a distribution of money with respect to its Fund shares equal to the shareholder's proportionate share of the amount of such credits and be allowed a credit against the shareholder's U.S. federal income tax liability equal to the amount of such deemed distribution. A shareholder's ability to claim a tax credit associated with one or more tax credit bonds may be subject to certain limitations imposed by the Code, and the amount of the tax credits may not exceed the amount reported by the Fund in a written notice to shareholders. Even if a Fund is eligible to pass through tax credits to shareholders, the Fund may choose not to do so.

As required by federal law, detailed federal tax information with respect to each calendar year will be furnished to each shareholder early in the succeeding year.

Tax Considerations Applicable to Funds Investing in Portfolios Treated as Partnerships

The International Developed Equity Index Fund and the Hedged International Developed Equity Index Fund invest substantially all of their investable assets in a corresponding Portfolio that is treated as a partnership for U.S. federal income tax purposes. The nature and character of each such Fund's income, gains, losses and deductions will generally be determined at the Portfolio level and each such Fund will be allocated its share of Portfolio income and gains. As applicable, references to income, gains, losses and deductions of a Fund will be to income, gains and losses recognized and deductions accruing at the Portfolio level and allocated to or otherwise taken into account by the Fund, and references to assets of a Fund will be to the Fund's allocable share of the assets of the corresponding Portfolio.

Such a Fund may be required to redeem a portion of its interest in a Portfolio in order to obtain sufficient cash to make the requisite distributions to maintain its qualification for treatment as a RIC. The Portfolio in turn may be required to sell investments in order to meet such redemption requests, including at a time when it may not be advantageous to do so.

A Fund is permitted to realize a loss on a redemption of Portfolio shares only if and when all Portfolio shares held by the Fund are completely redeemed for cash.

Tax Considerations Applicable to Funds Investing in Portfolios and Underlying Funds Treated as RICs

Each of the Index Funds (other than the Emerging Markets Equity Index Fund, the International Developed Equity Index Fund and the Hedged International Developed Equity Index Fund) seek to achieve their investment objectives by investing substantially all of their investable assets in a corresponding Portfolio, which itself intends to elect to be treated and to qualify and be eligible each year to be treated as a RIC. Whether each such Fund meets the asset diversification test described above will depend on whether the corresponding Portfolio meets each of the income, asset diversification and distribution tests. If a Portfolio were to fail to meet any such test and were ineligible to or otherwise were not to cure such failure, the corresponding Fund would as a result itself fail to meet the asset diversification test and might be ineligible or unable to or might otherwise not cure such failure.

Each Target Retirement Fund seeks to achieve its investment objectives by investing substantially all of its investable assets in one or more Underlying Funds and each such Underlying Fund intends to elect to be treated and to qualify and be eligible each year to be treated as a RIC. Whether a Target Retirement Fund meets the asset diversification test described above will thus depend in part on whether the Underlying Funds in which it invests meet each of the income, asset diversification, and distribution tests. If an Underlying were to fail to meet any such test and were ineligible to or otherwise were not to cure such failure, the corresponding Fund might as a result itself fail to meet the asset diversification test and might be ineligible or unable to or might otherwise not cure such failure.

Each such Fund's distributable income and gains will normally consist substantially of distributions from the corresponding Portfolio or the Underlying Funds in which it invests. To the extent that a Portfolio or Underlying Fund realizes net losses on its investments for a given taxable year, the corresponding Fund will not be able to benefit from those losses until and only to the extent that (i) the Portfolio or Underlying Fund realizes gains that it can reduce by those losses, or (ii) the Fund recognizes its share of those losses when it disposes of shares of the Portfolio or Underlying Fund in a transaction qualifying for sale or exchange treatment. Moreover, even when a Fund does make such a disposition, any loss will be recognized as a capital loss, a portion of which may be a long-term capital loss. A Fund will not be able to offset any capital losses from its dispositions of shares of the corresponding Portfolio or Underlying Funds against its ordinary income (including distributions of any net short-term capital gains realized by a Portfolio or Underlying Fund), and the Fund's long-term capital losses first offset its long-term capital gains, increasing the likelihood that the Fund's short-term capital gains are distributed to shareholders as ordinary income.

In addition, in certain circumstances, the “wash sale” rules under Section 1091 of the Code may apply to these Funds' sales of the corresponding Portfolio or Underlying Fund shares that have generated losses. A wash sale occurs if shares of an issuer are sold by a Fund at a loss and the Fund acquires additional shares of that same issuer 30 days before or after the date of the sale. The wash-sale rules could defer losses in these Funds' hands on corresponding Portfolio or Underlying Fund shares (to the extent such sales are wash sales) for extended (and, in certain cases, potentially indefinite) periods of time.

The foregoing rules may cause the tax treatment of these Funds' gains, losses and distributions to differ at times from the tax treatment that would apply if the Fund invested directly in the types of securities held by the Underlying Funds. As a result, investors may receive taxable distributions earlier and recognize higher amounts of capital gain or ordinary income than they otherwise would.

Tax Implications of Certain Fund Investments

Investments in Other RICs. If a Fund receives dividends from a Portfolio treated as a RIC, or an Underlying Fund, or another underlying RIC (each, an “underlying RIC”) or a Portfolio or an Underlying Fund receives dividends from an underlying RIC, and the underlying RIC reports such dividends as qualified dividend income, then the Fund, the Portfolio or the Underlying Fund, as applicable, is permitted, in turn, to report a portion of such dividends as “qualified dividend income” when it distributes such portion to its shareholders, provided holding period and other requirements are met.

If a Fund, a Portfolio or Underlying Fund receives dividends from an underlying RIC, and the underlying RIC reports such dividends as eligible for the dividends-received deduction, then the Fund, the Portfolio or the Underlying Fund, as applicable, is permitted, in turn, to report a portion of such dividends as eligible for the dividends-received deduction as well when it distributes such portion to its shareholders, provided holding period and other requirements are met.

If an underlying RIC in which a Fund, a Portfolio or Underlying Fund invests elects to pass through tax credit bond credits to its shareholders, then the Fund, the Portfolio or Underlying Fund is permitted in turn to elect to pass through its proportionate share of those tax credits to its shareholders, provided that the Fund, the Portfolio or the Underlying Fund, as applicable, meets shareholder notice and other requirements.

Some debt obligations with a fixed maturity date of more than one year from the date of issuance that are acquired in the secondary market by a Fund may be treated as having “market discount.” Very generally, market discount is the excess of the stated redemption price of a debt obligation (or in the case of an obligation issued with OID, its “revised issue price”) over the purchase price of such obligation. Generally, any gain recognized on the disposition of, and any partial payment of principal on, a debt obligation having market discount is treated as ordinary income to the extent the gain, or principal payment, does not exceed the “accrued market discount” on such debt obligation. Alternatively, a Fund may elect to accrue market discount currently, in which case the Fund will be required to include the accrued market discount in income (as ordinary income) and thus distribute it over the term of the debt obligation, even though payment of that amount is not received until a later time, upon partial or full repayment or disposition of the debt obligation. If a Fund makes the election referred to in the preceding sentence, then the rate at which the market discount accrues, and thus is included in a Fund's income, will depend upon which of the permitted accrual methods the Fund elects.

If a Fund holds the foregoing kinds of obligations, or other obligations subject to special rules under the Code, the Fund may be required to pay out as an income distribution each year an amount which is greater than the total amount of cash interest the Fund actually received. Such distributions may be made from the cash assets of the Fund or, if necessary, by disposition of portfolio securities including at a time when it may not be advantageous to do so. These dispositions may cause a Fund to realize higher amounts of short-term capital gains (generally taxed to shareholders at ordinary income tax rates) and, in the event the Fund realizes net capital gains from such transactions, its shareholders may receive a larger Capital Gain Dividend than they would have if the Fund had not held such obligations.

Securities Purchased at a Premium. Very generally, where a Fund purchases a bond at a price that exceeds the redemption price at maturity – that is, at a premium — the premium is amortizable over the remaining term of the bond. In the case of a taxable bond, if a Fund makes an election applicable to all such bonds it purchases, which election is irrevocable without consent of the IRS, the Fund reduces the current taxable income from the bond by the amortized premium and reduces its tax basis in the bond by the amount of such offset; upon the disposition or maturity of such bonds acquired on or after January 4, 2013, the Fund is permitted to deduct any remaining premium allocable to a prior period.

At-risk or Defaulted Securities. Investments in debt obligations that are at risk of or in default present special tax issues for the Funds. Tax rules are not entirely clear about issues such as when a Fund may cease to accrue interest, OID or market discount; whether, when or to what extent the Fund should recognize market discount on debt obligations; when and to what extent a Fund may take deductions for bad debts or worthless securities; and how a Fund should allocate payments received on obligations in default between principal and income. These and other related issues will be addressed by a Fund when, as and if it invests in such securities, in order to seek to ensure that it distributes sufficient income to preserve its status as a RIC and does not become subject to U.S. federal income or excise tax.

Certain Investments in REITs. Any investment by a Fund in equity securities of real estate investment trusts qualifying as such under Subchapter M of the Code (“REITs”) may result in the Fund's receipt of cash in excess of the REIT's earnings; if the Fund distributes these amounts, these distributions could constitute a return of capital to Fund shareholders for U.S. federal income tax purposes. Dividends received by a Fund from a REIT will not qualify for the corporate dividends-received deduction and generally will not constitute qualified dividend income.

a portion of a Fund's income (including income allocated to the Fund from certain pass-through entities) that is attributable to a residual interest in a REMIC or an equity interest in a TMP (referred to in the Code as an “excess inclusion”) will be subject to U.S. federal income tax in all events. This notice also provides, and the regulations are expected to provide, that excess inclusion income of a RIC, such as a Fund, will be allocated to shareholders of the RIC in proportion to the dividends received by such shareholders, with the same consequences as if the shareholders held the related interest directly. As a result, a RIC investing in such securities may not be a suitable investment for charitable remainder trusts (“CRTs”), as noted below.

Passive Foreign Investment Companies. Equity investments by a Fund in certain “passive foreign investment companies” (“PFICs”) could potentially subject the Fund to a U.S. federal income tax (including interest charges) on distributions received from the company or on proceeds received from the disposition of shares in the company. This tax cannot be eliminated by making distributions to Fund shareholders. However, a Fund may elect to avoid the imposition of that tax. For example, a Fund may elect to treat a PFIC as a “qualified electing fund” (i.e., make a “QEF election”), in which case the Fund will be required to include its share of the PFIC 's income and net capital gains annually, regardless of whether it receives any distribution from the PFIC. A Fund also may make an election to mark the gains (and to a limited extent losses) in such holdings “to the market” as though it had sold (and, solely for purposes of this mark-to-market election, repurchased) its holdings in those PFICs on the last day of the Fund's taxable year. Such gains and losses are treated as ordinary income and loss. The QEF and mark-to-market elections may accelerate the recognition of income (without the receipt of cash) and increase the amount required to be distributed by the Fund to avoid taxation. Either of these elections therefore may require a Fund to liquidate other investments (including when it is not advantageous to do so) to meet its distribution requirement, which also may accelerate the recognition of gain and affect the Fund's total return. Dividends paid by PFICs will not be eligible to be treated as “qualified dividend income.”

Because it is not always possible to identify a foreign corporation as a PFIC, a Fund may incur the tax and interest charges described above in some instances.

The tax treatment of certain positions entered into by a Fund, including regulated futures contracts, certain foreign currency positions and certain listed non-equity options, will be governed by Section 1256 of the Code (“Section 1256 contracts”). Gains or losses on Section 1256 contracts generally are considered 60% long-term and 40% short-term capital gains or losses (“60/40”), although certain foreign currency gains and losses from such contracts may be treated as ordinary in character. Also, Section 1256 contracts held by a Fund at the end of each taxable year (and, for purposes of the 4% excise tax, on certain other dates as prescribed under the Code) are “marked to market” with the result that unrealized gains or losses are treated as though they were realized and the resulting gain or loss is treated as ordinary or 60/40 gain or loss, as applicable.

Derivatives, Hedging, and Related Transactions. In addition to the special rules described above in respect of futures and options transactions, a Fund's transactions in other derivatives instruments (e.g., forward contracts and swap agreements), as well as any of its hedging, short sale, securities loan or similar transactions, may be subject to one or more special tax rules (e.g., notional principal contract, straddle, constructive sale, wash sale and short sale rules). These rules may affect whether gains and losses recognized by a Fund are treated as ordinary or capital, accelerate the recognition of income or gains to the Fund, defer losses to the Fund, and cause adjustments in the holding periods of the Fund's securities, thereby affecting whether capital gains and losses are treated as short-term or long-term. These rules could therefore affect the amount, timing and/or character of distributions to shareholders.

Commodity-Linked Instruments. A Fund's direct or indirect investments in commodities and commodity-linked instruments can be limited by the Fund's intention to qualify as a RIC, and can bear on the Fund's ability to so qualify. Income and gains from commodities and certain commodity-linked instruments does not constitute qualifying income to a RIC for purposes of the 90% gross income test described above. The tax treatment of some other commodity-linked instruments in which a Fund might invest is not certain, in particular with respect to whether income or gains from such instruments constitute qualifying income to a RIC. If a Fund were to treat income or gain from a particular instrument as qualifying income and the income or gain were later determined not to constitute qualifying income and, together with any other nonqualifying income, caused the Fund's nonqualifying income to exceed 10% of its gross income in any taxable year, the Fund would fail to qualify as a RIC unless it is eligible to and does pay a tax at the Fund level.

Book-Tax Differences. Certain of a Fund's investments in derivatives instruments and foreign currency-denominated instruments, and any of the Fund's transactions in foreign currencies and hedging activities, are likely to produce a difference between its book income and the sum of its taxable income and net tax-exempt income (if any). If such a difference arises, and a Fund's book income is less than the sum of its taxable income and net tax-exempt income, the Fund could be required to make distributions exceeding book income to qualify as a RIC that is accorded special tax treatment and to avoid an entity-level tax. In the alternative, if a Fund's book income exceeds the sum of its taxable income (including realized capital gains) and net tax-exempt income, the distribution (if any) of such excess generally will

be treated as (i) a dividend to the extent of the Fund's remaining earnings and profits (including earnings and profits arising from tax-exempt income), (ii) thereafter, as a return of capital to the extent of the recipient's basis in its shares, and (iii) thereafter as gain from the sale or exchange of a capital asset.

Foreign Taxation

A Fund's income, proceeds and gains from sources within foreign countries may be subject to non-U.S. withholding or other taxes, which will reduce the yield on those investments. Tax conventions between certain countries and the United States may reduce or eliminate such taxes. If, at the close of a Fund's taxable year, more than 50% of the assets of the Fund consists of the securities of foreign corporations, the Fund may elect to permit shareholders to claim a credit or deduction (but not both) on their income tax returns for their pro rata portions of qualified taxes paid by a Fund to foreign countries in respect of foreign securities that the Fund has held for at least the minimum period specified in the Code. In such a case, shareholders will include in gross income from foreign sources their pro rata shares of such taxes paid by such Fund. A shareholder's ability to claim an offsetting foreign tax credit or deduction in respect of foreign taxes paid by a Fund is subject to certain limitations imposed by the Code, which may result in the shareholder's not receiving a full credit or deduction (if any) for the amount of such taxes. Shareholders who do not itemize on their U.S. federal income tax returns may claim a credit (but not a deduction) for such foreign taxes. Even if a Fund were eligible to make such an election for a given year, it may determine not to do so.

If a Fund does not qualify for or does not make such election, shareholders will not be entitled to claim a credit or deduction with respect to foreign taxes paid by the Fund; in that case the foreign tax will nonetheless reduce the Fund's taxable income. Shareholders that are not subject to U.S. federal income tax, and those who invest in a Fund through tax-advantaged accounts (including those who invest through individual retirement accounts or other tax-advantaged retirement plans), generally will receive no benefit from any tax credit or deduction passed through by the Fund, if any. Under certain circumstances, if the Fund receives a refund of foreign taxes paid in respect of a prior year, the value of Fund Shares could be affected or any foreign tax credits or deductions passed through to shareholders in respect of the Fund's foreign taxes for the current year could be reduced.

If at the close of each quarter of its taxable year, at least 50% of the total assets of a Fund consists of interests in other RICs (such as a Portfolio or Underlying Fund treated as a RIC), such Fund will be a “qualified fund of funds.” In that case, the Fund is permitted to elect to pass through to its shareholders foreign income and other similar taxes paid by the Fund in respect of foreign securities held directly by the Fund or by the underlying RIC in which it invests that itself elected to pass such taxes through to shareholders. However, even if a Fund qualifies to make such election for any year, it may determine not to do so. Shareholders that are not subject to U.S. federal income tax, and those who invest in a Fund through tax-advantaged accounts (including those who invest through individual retirement accounts or other tax-advantaged retirement plans), generally will receive no benefit from any tax credit or deduction passed through by the Fund.

Backup Withholding

Tax-Exempt Shareholders

In addition, special tax consequences apply to charitable remainder trusts (“CRTs”) that invest in RICs that invest directly or indirectly in residual interests in REMICs or equity interests in TMPs. Under legislation enacted in December 2006, a CRT (as defined in Section 664 of the Code) that realizes any UBTI for a taxable year must pay an excise tax annually of an amount equal to such UBTI.

Under IRS guidance issued in October 2006, a CRT will not recognize UBTI as a result of investing in a RIC that recognizes “excess inclusion income.” Rather, if at any time during any taxable year a CRT (or one of certain other tax-exempt shareholders, such as the United States, a state or political subdivision, or an agency or instrumentality thereof, and certain energy cooperatives) is a record holder of a share in a RIC that recognizes “excess inclusion income,” then the RIC will be subject to a tax on that portion of its “excess inclusion income” for the taxable year that is allocable to such shareholders at the highest U.S. federal corporate income tax rate. The extent to which this IRS guidance remains applicable in light of the December 2006 legislation is unclear. To the extent permitted under the 1940 Act, each Fund may elect to specially allocate any such tax to the applicable CRT, or other shareholder, and thus reduce such shareholder's distributions for the year by the amount of the tax that relates to such shareholder's interest in a Fund. CRTs are urged to consult their tax advisors concerning the consequences of investing in each Fund.

Redemptions and Exchanges

Redemptions and exchanges of each Fund's shares are taxable events and, accordingly, shareholders may realize gain or loss on these transactions. In general, any gain or loss realized upon a taxable disposition of shares will be treated as long-term capital gain or loss if the shares have been held for more than 12 months. Otherwise, the gain or loss on the taxable disposition of Fund shares will be treated as short-term capital gain or loss. However, any loss realized upon a taxable disposition of Fund shares held by a shareholder for six months or less will be treated as long-term, rather than short-term, to the extent of any Capital Gain Dividends received (or deemed received) by the shareholder with respect to the shares. Further, all or a portion of any loss realized upon a taxable disposition of Fund shares generally will be disallowed under the Code's “wash sale” rule if other substantially identical shares are purchased, including by means of dividend reinvestment, within 30 days before or after the disposition. In such a case, the basis of the newly purchased shares will be adjusted to reflect the disallowed loss.

Upon the redemption or exchange of shares of a Fund, the Fund or, in the case of shares purchased through a financial intermediary, the financial intermediary may be required to provide you and the IRS with cost basis and certain other related tax information about the Fund shares you redeemed or exchanged. See the Funds' prospectuses for more information.

Tax Shelter Reporting

Under U.S. Treasury regulations, if a shareholder recognizes a loss of at least $2 million in any single taxable year or $4 million in any combination of taxable years for an individual shareholder or at least $10 million in any taxable year or $20 million in any combination of taxable years for a corporate shareholder, the shareholder must file with the IRS a disclosure statement on IRS Form 8886. Direct shareholders of portfolio securities are in many cases excepted from this reporting requirement, but under current guidance, shareholders of a RIC are not excepted. Future guidance may extend the current exception from this reporting requirement to shareholders of most or all RICs. The fact that a loss is reportable under these regulations does not affect the legal determination of whether the taxpayer's treatment of the loss is proper. Shareholders should consult their tax advisers to determine the applicability of these regulations in light of their individual circumstances.

Non-U.S. Shareholders

Non-U.S. shareholders in a Fund should consult their tax advisors concerning the tax consequences of ownership of shares in the Fund. Distributions by a Fund to shareholders that are not “U.S. persons” within the meaning of the Code ( “foreign shareholders”) properly reported by the Fund as (1) Capital Gain Dividends, (2) short-term capital gain dividends, and (3) interest-related dividends, each as defined and subject to certain conditions described below, generally are not subject to withholding of U.S. federal income tax.

The exceptions to withholding for Capital Gain Dividends and short-term capital gain dividends do not apply to (A) distributions to an individual foreign shareholder who is present in the United States for a period or periods aggregating 183 days or more during the year of the distribution and (B) distributions attributable to gain that is treated as effectively connected with the conduct by the foreign shareholder of a trade or business within the United States under special rules regarding the disposition of “U.S. real property interests” (“USRPIs”) as described below. The exception to withholding for interest-related dividends does not apply to distributions to a foreign shareholder (i) that has not provided a satisfactory statement that the beneficial owner is not a U.S. person, (ii) to the extent that the dividend is attributable to certain interest on an obligation if the foreign shareholder is the issuer or is a 10% shareholder of the issuer, (iii) that is within certain foreign countries that have inadequate information exchange with the United States, or (iv) to the extent the dividend is attributable to interest paid by a person that is a related person of the foreign shareholder and the foreign shareholder is a controlled foreign corporation). If a Fund invests in a RIC that pays such distributions to the Fund, such distributions retain their character as not subject to withholding if properly reported when paid by the Fund to foreign shareholders. A RIC is permitted to report such parts of its dividends as are eligible to be treated as interest-related or short-term capital gain dividends, but it is not required to do so. In the case of shares held through an intermediary, the intermediary may withhold even if a Fund reports all or a portion of a payment as an interest-related or short-term capital gain dividend to shareholders.

Foreign shareholders should contact their intermediaries regarding the application of withholding rules to their accounts.

Distributions by a Fund to foreign shareholders other than Capital Gain Dividends, short-term capital gain dividends and interest-related dividends (e.g., dividends attributable to dividend and foreign-source interest income or to short-term capital gains or U.S. source interest income to which the exception from withholding described above does not apply) are generally subject to withholding of U.S. federal income tax at a rate of 30% (or lower applicable treaty rate).

Special rules would apply if a Fund were a qualified investment entity (“QIE”) because it is either a “U.S. real property holding corporation” (“USRPHC”) or would be a USRPHC but for the operation of certain exceptions to the definition thereof. Very generally, a USRPHC is a domestic corporation that holds USRPIs the fair market value of which equals or exceeds 50% of the sum of the fair market values of the corporation's USRPIs, interests in real property located outside the United States, and other trade or business assets. USRPIs are generally defined as any interest in U.S. real property and any interest (other than solely as a creditor) in a USRPHC or, very generally, an entity that has been a USRPHC in the last five years. A Fund that holds, directly or indirectly, significant interests in REITs may be a USRPHC. Interests in domestically controlled QIEs, including REITs and RICs that are QIEs, not-greater-than-10% interests in publicly traded classes of stock in REITs and not-greater-than-5% interests in publicly traded classes of stock in RICs generally are not USRPIs, but these exceptions do not apply for purposes of determining whether a Fund is a QIE. If an interest in a Fund were a USRPI, the Fund would be required to withhold U.S. tax on the proceeds of a share redemption by a greater-than-5% foreign shareholder, in which case such foreign shareholder generally would also be required to file U.S. tax returns and pay any additional taxes due in connection with the redemption.

U.S. tax withholding. In addition, such distributions could result in the foreign shareholder being required to file a U.S. tax return and pay tax on the distributions at regular U.S. federal income tax rates. The consequences to a foreign shareholder, including the rate of such withholding and character of such distributions (e.g., as ordinary income or USRPI gain), would vary depending upon the extent of the foreign shareholder's current and past ownership of the Fund. Each Fund generally does not expect that it will be a QIE.

Foreign shareholders should consult their tax advisers and, if holding shares through intermediaries, their intermediaries, concerning the application of these rules to their investment in a Fund.

In order for a foreign shareholder to qualify for any exemptions from withholding described above or for lower withholding tax rates under income tax treaties, or to establish an exemption from back-up withholding, the foreign shareholder must comply with special certification and filing requirements relating to its non-U.S. status (including, in general, furnishing an IRS Form W-8BEN, IRS Form W-8BEN-E or substitute form). Foreign shareholders in a Fund should consult their tax advisers in this regard. Special rules (including withholding and reporting requirements) apply to foreign partnerships and those holding Fund shares through foreign partnerships. Additional considerations may apply to foreign trusts and estates. Investors holding Fund shares through foreign entities should consult their tax advisers about their particular situation.

A foreign shareholder may be subject to state and local tax and to the U.S. federal estate tax in addition to the U.S. federal income tax on income referred to above.

Shareholder Reporting Obligations with Respect to Foreign Bank and Financial Accounts

Other Reporting and Withholding Requirements

Sections 1471-1474 of the Code and the U.S. Treasury and IRS guidance issued thereunder (collectively, “FATCA”) generally require a Fund to obtain information sufficient to identify the status of each of its shareholders under FATCA or under an applicable intergovernmental agreement (an “IGA”) between the United States and a foreign government. If a shareholder fails to provide the requested information or otherwise fails to comply with FATCA or an IGA, the Fund may be required to withhold under FATCA at a rate of 30% with respect to that shareholder on ordinary dividends it pays. The IRS and the Department of Treasury have issued proposed regulations providing that these withholding rules will not apply to the gross proceeds of share redemptions or Capital Gain Dividends a Fund pays. If a payment by a Fund is subject to FATCA withholding, the Fund is required to withhold even if such payment would otherwise be exempt from withholding under the rules applicable to foreign shareholders described above (e.g., short-term capital gain dividends and interest-related dividends).

Each prospective investor is urged to consult its tax adviser regarding the applicability of FATCA and any other reporting requirements with respect to the prospective investor's own situation, including investments through an intermediary.

General Considerations

The U.S. federal income tax discussion set forth above is for general information only. Prospective investors should consult their tax advisors regarding the specific U.S. federal income tax consequences of purchasing, holding, and disposing of shares of the Fund, as well as the effects of state, local, foreign, and other tax laws and any proposed tax law changes.

Underwriter

SSGA FD serves as the Funds' distributor pursuant to the Distribution Agreement by and between SSGA FD and the Trust. Pursuant to the Distribution Agreement, the Funds pay SSGA FD fees under the Rule 12b-1 Plan in effect for the Funds. For a description of the fees paid to SSGA FD under the Rule 12b-1 Plan, see “Shareholder Servicing and Distribution Plans,” above. SSGA FD is not obligated to sell any specific number of shares and will sell shares of a Fund on a continuous basis only against orders to purchase shares. The principal business address of SSGA FD is One Iron Street, Boston, MA 02210.

Financial Statements

The audited financial statements for the fiscal year ended December 31, 2024 for the Funds in operation at that date are included in each Fund's Form N-CSR filing, which was filed with the SEC on March 6, 2025 (SEC Accession No. 0001193125-25-048021) and are incorporated into this SAI by reference. Each Fund's Form N-CSR filing is available, without charge, upon request, by calling (800) 647-7327 or through the Funds' website at www.ssga.com.