Summary Prospectus
May 1, 2026 (As revised June 12, 2026)
AMG GW&K Securitized Bond SMA Shares
 
 
 
GWSBX
 
Before you invest, you may want to review the Fund’s prospectus and statement of additional information, which contain more information about the Fund and its risks. You can find the Fund’s prospectus, statement of additional information, reports to shareholders and other information about the Fund online at
https://wealth.amg.com/literature. You can also get this information at no cost by calling 1-800-548-4539 or by sending an e-mail request to shareholderservices@amg.com. The current prospectus and statement of additional information, dated May 1, 2026, as revised or supplemented from time to time, are incorporated by reference into this summary prospectus.
Investment Objective
The investment objective of AMG GW&K Securitized Bond SMA Shares (the “Fund”) is to provide total return through income and capital appreciation.
Fees and Expenses of the Fund
The table below describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. 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.
Annual Fund Operating Expenses
(expenses that you pay each year as a percentage of the value of your investment)
 
 
 
Management Fee1
0.00
%
Distribution and Service (12b-1) Fees
None
Other Expenses2
0.21
%
Total Annual Fund Operating Expenses
0.21
%
Fee Waiver and Expense Reimbursements3
(0.21)%
Total Annual Fund Operating Expenses After Fee Waiver
and Expense Reimbursements3
0.00
%
1Neither AMG Funds LLC (the “Investment Manager”) nor GW&K Investment Management, LLC (“GW&K” or the “Subadviser”) charges a management fee to the Fund. Shareholders should be aware, however, that the Fund is an integral part of separately managed account programs, and the Investment Manager or the Subadviser will be compensated directly or indirectly by sponsors of separately managed account programs (“Program Sponsors”) or program participants for managed account advisory services.
2Expense information has been restated to reflect current fees.
3The Investment Manager has contractually agreed, through at least May 1, 2027, to waive fees and/or pay or reimburse the Fund’s expenses in order to limit total annual operating expenses (exclusive of taxes, interest (including interest incurred in connection with bank and custody overdrafts and in connection with securities sold short), brokerage commissions and other transaction costs, dividends payable with respect to securities sold short, acquired fund fees and expenses, and extraordinary expenses) of the Fund to the annual rate of 0.00% of the average daily net assets attributable to the Fund. The contractual expense limitation may only be terminated in the event the Investment Manager or a successor ceases to be the investment manager of the Fund or a successor fund, by mutual agreement between the Investment Manager and the AMG Funds Board of Trustees or in the event of the Fund’s liquidation unless the Fund is reorganized or is a party to a merger in which the surviving entity is successor to the accounting and performance information of the Fund.
Expense Example
This Example will help you compare the cost of investing in the Fund to the cost of investing in other mutual funds. The Example makes certain assumptions. It assumes that you invest $10,000 as an initial investment in the Fund for the time periods
indicated and then redeem all of your shares at the end of those periods. It also assumes that your investment has a 5% total return each year and the Fund’s operating expenses remain the same. The first year of each amount shown in the Example reflects the Fund’s contractual expense limitation through May 1, 2027. Although your actual costs may be higher or lower, based on the above assumptions, your costs would be:
 
1 Year
3 Years
5 Years
10 Years
$0
$46
$97
$247
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 Fund’s initial fiscal period (June 12, 2025 through December 31, 2025), the Fund’s portfolio turnover rate was 33% of the average value of its portfolio.
Principal Investment Strategies
Under normal market conditions, the Fund will invest at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in a diversified portfolio of securitized bonds. The Fund considers a securitized bond to be an interest in a pool of mortgages, loans, receivables, or other assets. The payment of principal or interest on securitized bonds generally depends on the cash flows generated by the underlying assets. The Fund normally invests in bonds that are rated “investment grade” by a nationally recognized statistical rating organization (“NRSRO”), such as Moody’s Investors Service, Inc. (“Moody’s”) or S&P Global Ratings (“S&P”), at the time of purchase. Investment grade securities are rated at least in the BBB/Baa major ratings categories by an NRSRO. From time to time, the Fund may invest in unrated bonds, which are considered by GW&K to be of comparable quality and creditworthiness as investment grade rated securities. In cases where the credit ratings agencies have assigned different credit ratings to the same security, the Fund will use the median rating when three NRSROs provide ratings (split-to-middle). When ratings are available from only two NRSROs, the Fund will assign the lower of the two ratings (split-to-low). The Fund may continue to hold securities that are downgraded in credit rating subsequent to their purchase if GW&K believes it would be advantageous to do so.
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AMG GW&K Securitized Bond SMA Shares SUMMARY PROSPECTUS
The Fund intends to invest primarily in, but is not limited to, agency residential mortgage-backed securities, non-agency residential mortgage-backed securities, non-agency commercial mortgage-backed securities and agency commercial mortgage-backed securities, collateralized mortgage obligations (including interest only, principal only, and other prepayment derivatives), collateralized loan obligations (“CLOs”), asset-backed securities and credit linked notes. GW&K may consider, among other factors, credit, interest rate, prepayment and liquidity risks, as well as general market conditions, when deciding whether to buy or sell investments.
The Fund also may invest up to 20% of its net assets in other US government securities, including, but not limited to, US Treasury bills, notes and bonds, securities issued by agencies or instrumentalities of the U.S. Government which may or may not be backed by the full faith and credit of the United States, and securities issued by agencies or instrumentalities which are backed solely by the credit of the issuing agency or instrumentality but that are not considered securitized bonds.
While the Fund may purchase debt securities of any duration, the Fund typically seeks to maintain an average effective duration that is within +/-20% of the average effective duration of the Bloomberg US Securitized Index (the “Index”), which was approximately 4.89 years as of February 28, 2026. The average effective duration of debt securities in the Fund’s portfolio may, however, be shorter or longer depending on market conditions.
In selecting potential investments for the Fund, GW&K uses top-down research that focuses on managing duration, yield curve, credit quality, volatility and liquidity, as well as bottom-up research that focuses on fundamental analysis, valuation analysis, and technical analysis. GW&K may adjust its assessment of an investment based on a number of considerations.
The Fund may use derivatives and similar instruments for a variety of purposes, including hedging, risk management, portfolio management or to earn income. The Fund’s use of derivatives may involve the purchase and sale of derivative instruments such as futures, options, to-be-announced (TBA) commitments, swaps and other similar instruments and techniques. Derivatives that provide investment exposure to securitized bonds, or to one or more market risk factors associated with securitized bonds, may be counted toward the Fund’s 80% investment policy.
Principal Risks
There is the risk that you may lose money on your investment. All investments carry a certain amount of risk, and the Fund cannot guarantee that it will achieve its investment objective. An investment in the Fund is not a deposit or obligation of any bank, is not endorsed or guaranteed by any bank, and is not insured by the Federal Deposit Insurance Corporation (“FDIC”) or any other government agency. The Fund is intended to be used as part of a managed account program. The performance and objectives of the Fund should be evaluated in the context of the investor’s managed account program. The Fund is not designed to be used as a stand-alone investment.
Below are some of the risks of investing in the Fund. The risks are presented in an order intended to facilitate readability and their order does not imply that the realization of one risk is more likely to occur than another risk or likely to have a greater adverse impact than another risk. 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.
Debt Securities Risk—the value of a debt security changes in response to various factors, including, for example, market-related factors, such as changes in interest rates or changes in the actual or perceived ability of an issuer to meet its obligations. Investments in debt securities are subject to, among other risks, credit risk, interest rate risk, extension risk, prepayment risk and liquidity risk.
Market Risk—market prices of investments held by the Fund may fall rapidly or unpredictably due to a variety of factors, including economic or market conditions, or other factors including terrorism, war, natural disasters and the spread of infectious illness or other public health issues, including epidemics or pandemics, or in response to events that affect particular industries or companies. In addition, unexpected political, regulatory, trade and diplomatic events within the United States and abroad may affect investor and consumer confidence and may adversely impact financial markets and the broader economy, perhaps suddenly and to a significant degree.
Interest Rate Risk—fixed coupon payments (cash flows) of bonds and debt securities may become less competitive with the market in periods of rising interest rates and cause bond prices to decline. During periods of increasing interest rates, the Fund may experience high levels of volatility and shareholder redemptions, and may have to sell securities at times when it would otherwise not do so, and at unfavorable prices, which could reduce the returns of the Fund.
Asset-Backed and Mortgage-Backed Securities Risk—investments in asset-backed and mortgage-backed securities involve risk of severe credit downgrades, loss due to prepayments that occur earlier or later than expected, illiquidity and default.
Credit and Counterparty Risk—the issuer of bonds or other debt securities or a counterparty to a derivatives contract (including over-the-counter counterparties as well as brokers and clearinghouses in respect of exchange-traded and/or cleared products) may be unable or unwilling, or may be perceived as unable or unwilling, to make timely interest, principal or settlement payments or otherwise honor its obligations. Changes in an issuer’s financial strength, credit rating or the market’s perception of an issuer's creditworthiness may also affect the value of the Fund’s investment in that issuer.
Changing Distribution Level Risk—the Fund will normally receive income which may include interest, dividends and/or capital gains, depending upon its investments. The distribution amount paid by the Fund will vary and generally depends on the amount of income the Fund earns (less expenses) on its portfolio holdings, and capital gains or losses it recognizes. A decline in
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AMG GW&K Securitized Bond SMA Shares SUMMARY PROSPECTUS
the Fund’s income or net capital gains arising from its investments may reduce its distribution level.
Collateralized Loan Obligations and Other Collateralized Obligations Risk—the risks of investing in a CLO generally can be summarized as a combination of economic risks of the underlying loans combined with the risks associated with the CLO structure governing the priority of payments, and include interest rate risk, credit risk, liquidity risk, prepayment risk, and the risk of default of the underlying asset, among others.
Derivatives Risk—the use of derivatives involves costs, the risk that the value of derivatives may not correlate perfectly with their underlying assets, rates or indices, liquidity risk, and the risk of mispricing or improper valuation. The use of derivatives may not succeed for various reasons, and the complexity and rapidly changing structure of derivatives markets may increase the possibility of market losses.
Extension Risk—during periods of rising interest rates, a debtor may pay back a bond or other fixed income security slower than expected or required, and the value of such security may fall.
Floating Rate Instrument Risk— changes in interest rates may affect the yield on the Fund’s investments in floating rate investments. Floating rate investments may decline in value if their interest rates do not rise as much, or as quickly, as interest rates in general. Conversely, a decline in interest rates may result in a reduction in income received from floating rate investments held by the Fund and may adversely affect the value of the Fund’s shares.
Inflation/Deflation Risk—inflation risk is the risk that the value of assets or income from investments will be worth less in the future. 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 inflation rates increase, fixed income securities markets may experience heightened levels of interest rate volatility and liquidity risk. Deflation risk is the risk that the prices throughout the economy decline over time – the opposite of inflation. Deflation may have an adverse effect on the creditworthiness of issuers and may make issuer default more likely, which may result in a decline in the value of the Fund’s portfolio.
Leverage Risk—borrowing and some derivative investments such as futures, forward commitment transactions and swaps may increase volatility and magnify smaller adverse market movements into relatively larger losses.
Liquidity Risk—the Fund may not be able to dispose of particular investments, such as illiquid securities, readily at favorable times or prices or the Fund may have to sell them at a loss.
Management Risk—because the Fund is an actively managed investment portfolio, security selection or focus on securities in a particular style, market sector or group of companies may cause the Fund to incur losses or underperform relative to its benchmarks or other funds with a similar investment objective. There can be no guarantee that the Subadviser’s investment techniques and risk analysis will produce the desired result.
Prepayment Risk—a debtor may exercise its right to pay back a bond or other debt security earlier than expected or required during periods of decreasing interest rates.
Restricted Securities Risk— investing in restricted securities (including, without limitation, Rule 144A securities) may reduce the liquidity of the Fund’s investments in the event that an adequate trading market does not exist for these securities. Limitations on the resale of restricted securities could adversely affect the marketability of the securities, and the Fund may be unable to sell the security at the desired time or price, if at all. The purchase price and subsequent valuation of restricted securities normally reflect a discount, which may be significant, from the market price of comparable unrestricted securities for which a liquid trading market exists.
U.S. Government Securities Risk—obligations issued by some U.S. Government agencies, authorities, instrumentalities, or sponsored enterprises such as Government National Mortgage Association (“GNMA”) are backed by the full faith and credit of the U.S. Government, while obligations issued by others, such as Federal National Mortgage Association (“FNMA”), Federal Home Loan Mortgage Corporation (“FHLMC”), and Federal Home Loan Banks (“FHLBs”), are not backed by the full faith and credit of the U.S. Government and are backed solely by the entity’s own resources or by the ability of the entity to borrow from the U.S. Treasury. If one of these agencies defaults on a loan, there is no guarantee that the U.S. Government will provide financial support. 
Performance
This section would normally include a bar chart and a table showing how the Fund has performed and how its performance has varied from year to year. Because the Fund has not yet completed a full calendar year of operations as of the date of this Prospectus, the bar chart and table are not shown. Although past performance of the Fund is no guarantee of how it will perform in the future, historical performance may give you some indication of the risks of investing in the Fund. The Fund is only offered to participants in certain managed account programs, and the Fund’s performance will differ from the performance of a client’s overall managed account. For more information about your managed account’s performance, contact the Subadviser or your Program Sponsor.
Portfolio Management
Investment Manager
AMG Funds LLC
Subadviser
GW&K Investment Management, LLC
Portfolio Managers
Brett Kozlowski, CFA
Partner and Portfolio Manager of GW&K; Portfolio Manager of the Fund since its inception in June 2025.
Brendan Doucette
Principal and Portfolio Manager of GW&K; Portfolio Manager of the Fund since its inception in June 2025.
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AMG GW&K Securitized Bond SMA Shares SUMMARY PROSPECTUS
Brian P. McArdle, CFA
Principal and Portfolio Manager of GW&K; Portfolio Manager of the Fund since June 2026.
Buying and Selling Fund Shares
TRANSACTION POLICIES
Shares of the Fund may be purchased only by or on behalf of separately managed account clients where the Subadviser has an agreement with the Program Sponsor, or directly with the client, to provide management or advisory services to the managed account or to the Program Sponsor for its use in managing such account.
There are no maximum or minimum investment requirements in the Fund (although the Subadviser or your Program Sponsor may have certain investment requirements).
Redemption orders are made based on instructions from the Subadviser or Program Sponsor to the broker-dealer who executes trades for the account. Shares of the Fund can be redeemed through the broker-dealer on any day the New York Stock Exchange is open.
Tax Information
The Fund intends to make distributions that are taxable to you as ordinary income or capital gains, except when your investment is through an IRA, 401(k), or other tax-advantaged investment
plan. By investing in the Fund through such a plan, you will not be subject to tax on distributions from the Fund so long as the amounts distributed remain in the plan, but you will generally be taxed upon withdrawal of monies from the plan.
Payments to Broker-Dealers and Other Financial Intermediaries
If you purchase the Fund through a Program Sponsor, broker-dealer or other financial intermediary (such as a bank), the Fund and its related companies, including the Investment Manager, AMG Distributors, Inc. (the “Distributor”) and the Subadviser, may pay the intermediary for the sale of Fund shares and related services. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your salesperson to recommend the Fund, or a managed account strategy of which the Fund is a part, over another investment. Ask your salesperson or visit your financial intermediary’s website for more information.
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