ADR American Depositary Receipt

1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

AMG Funds I (the “Trust”) is an open-end management investment company, organized as a Massachusetts business trust, and registered under the Investment Company Act of 1940, as amended (the “1940 Act”). Currently, the Trust consists of a number of different funds, each having distinct investment management objectives, strategies, risks, and policies. Included in this report is AMG Boston Common Global Impact Fund (the “Fund”).

The Fund’s financial statements are prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”), including accounting and reporting guidance pursuant to Accounting Standards Codification Topic 946 applicable to investment companies. U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of income and expenses during the reporting period. Actual results could differ from those estimates and such differences could be material. The following is a summary of significant accounting policies followed by the Fund in the preparation of its financial statements:

a. VALUATION OF INVESTMENTS

Equity securities traded on a national securities exchange or reported on the NASDAQ national market system (“NMS”) are valued at the last quoted sales price on the primary exchange or, if applicable, the NASDAQ official closing price or the official closing price of the relevant exchange or, lacking any sales, at the last quoted bid price. Equity securities held by the Fund that are traded in the over-the-counter market (other than NMS securities) are valued at the bid price. Foreign equity securities (securities principally traded in markets other than U.S. markets) held by the Fund are valued at the official closing price on the primary exchange or, for markets that either do not offer an official closing price or where the official closing price may not be representative of the overall market, the last quoted sale price.

Fixed income securities purchased with a remaining maturity of 60 days or less are valued at amortized cost, provided that the amortized cost value is approximately the same as the fair value of the security valued without the use of amortized cost. Investments in other open-end registered investment companies are valued at their end of day net asset value per share.

The Fund’s portfolio investments are generally valued based on independent market quotations or prices or, if none, “evaluative” or other market based valuations provided by third party pricing services. Pursuant to Rule 2a-5 under the 1940 Act, the Fund’s Board of Trustees (the “Board”) designated AMG Funds LLC (the “Investment Manager”) as the Fund’s Valuation Designee to perform the Fund’s fair value determinations. Such determinations are subject to Board oversight and certain reporting and other requirements intended to ensure that the Board receives the information it needs to oversee the Investment Manager’s fair value determinations.

Under certain circumstances, the value of certain Fund portfolio investments may be based on an evaluation of fair value, pursuant to procedures established by the Investment Manager and under the general supervision of the Board. The Fund may use the fair value of a portfolio investment to calculate its net asset value (“NAV”) in the event that the market quotation, price or market based valuation for the portfolio investment is not readily available or otherwise not determinable

pursuant to the Fund’s valuation procedures, if the Investment Manager believes the quotation, price or market based valuation to be unreliable, or in certain other circumstances. When determining the fair value of an investment, the Investment Manager seeks to determine the price that the Fund might reasonably expect to receive from current sale of that portfolio investment in an arms-length transaction. Fair value determinations shall be based upon consideration of all available facts and information, including, but not limited to (i) attributes specific to the investment; (ii) fundamental and analytical data relating to the investment; and (iii) the value of other comparable securities or relevant financial instruments, including derivative securities, traded on other markets or among dealers.

The values assigned to fair value portfolio investments are based on available information and do not necessarily represent amounts that might ultimately be realized in the future, since such amounts depend on future developments inherent in long-term investments. Because of the inherent uncertainty of valuation, those estimated values may differ significantly from the values that would have been used had a ready market for the investments existed, and the differences could be material. The Board will be presented with quarterly reports, as of the most recent quarter end, summarizing all fair value activity, material fair value matters that occurred during the quarter, and all outstanding securities fair valued by the Fund. Additionally, the Board will be presented with an annual report that assesses the adequacy and effectiveness of the Investment Manager’s process for determining the fair value of the Fund’s investments.

With respect to foreign equity securities, securities held in the Fund that can be fair valued by the applicable fair value pricing service are fair valued on each business day provided that each individual price exceeds a pre-established confidence level.

U.S. GAAP defines fair value as the price that a fund would receive to sell an asset or pay to transfer a liability in an orderly transaction between market participants at the measurement date. U.S. GAAP also establishes a framework for measuring fair value, and a three level hierarchy for fair value measurements based upon the transparency of inputs to the valuation of an asset or liability. Inputs may be observable or unobservable and refer broadly to the assumptions that market participants would use in pricing the asset or liability. Observable inputs reflect the assumptions market participants would use in pricing the asset or liability based on market data obtained from sources independent of the Fund. Unobservable inputs reflect the Fund’s own assumptions about the assumptions that market participants would use in pricing the asset or liability developed based on the best information available in the circumstances. Each investment is assigned a level based upon the observability of the inputs which are significant to the overall valuation.

The three-tier hierarchy of inputs is summarized below:

Level 1 – inputs are quoted prices in active markets for identical investments (e.g., equity securities, open-end investment companies)

Level 2 – other observable inputs (including, but not limited to: quoted prices for similar assets or liabilities in markets that are active, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the assets or liabilities (such as interest rates, yield curves, volatilities, prepayment speeds, loss severities, credit risks and default rates) or other market corroborated inputs) (e.g., debt securities, government securities, foreign securities utilizing international fair value pricing, fair valued securities with observable inputs)

Level 3 – inputs are significant unobservable inputs (including the Fund’s own assumptions used to determine the fair value of investments) (e.g., fair valued securities with unobservable inputs)

Changes in inputs or methodologies used for valuing investments may result in a transfer in or out of levels within the fair value hierarchy. The inputs or methodologies used for valuing investments may not necessarily be an indication of the risk associated with investing in those investments.

b. SECURITY TRANSACTIONS

Security transactions are accounted for as of trade date. Realized gains and losses on securities sold are determined on the basis of identified cost.

c. INVESTMENT INCOME AND EXPENSES

Dividend income is recorded on the ex-dividend date. Dividends from foreign securities are recorded on the ex-dividend date, and if after the fact, as soon as the Fund becomes aware of the ex-dividend date. Interest income, which includes amortization of premium and accretion of discount on debt securities, is accrued as earned. Dividend and interest income on foreign securities is recorded gross of any withholding tax. Non-cash dividends included in dividend income, if any, are reported at the fair market value of the securities received. Other income and expenses are recorded on an accrual basis. Expenses that cannot be directly attributed to the Fund are apportioned among the funds in the Trust and other trusts or funds within the AMG Funds Family of Funds (collectively, the “AMG Funds Family”) based upon their relative average net assets or number of shareholders.

d. DIVIDENDS AND DISTRIBUTIONS

Fund distributions resulting from either net investment income or realized net capital gains, if any, will normally be declared and paid at least annually in December. Distributions to shareholders are recorded on the ex-dividend date. Distributions are determined in accordance with federal income tax law, which may differ from net investment income and net realized capital gains for financial statement purposes (U.S. GAAP). Differences may be permanent or temporary. Permanent differences are reclassified among capital accounts in the financial statements to reflect their tax character. Permanent book and tax basis differences, if any, relating to shareholder distributions will result in reclassifications to paid-in capital. Temporary differences arise when certain items of income, expense and gain or loss are recognized in different periods for

financial statement and tax purposes; these differences will reverse at some time in the future. There were no permanent differences. Temporary differences are primarily due to mark to market on passive foreign investment companies, corporate return of capital distributions, and wash sale loss deferrals.

At March 31, 2026, the aggregate cost for federal income tax purposes approximates the aggregate cost for book purposes. The approximate cost of investments and the aggregate gross unrealized appreciation and depreciation for federal income tax purposes were as follows:

e. FEDERAL TAXES

The Fund currently qualifies as an investment company and intends to comply with the requirements under Subchapter M of the Internal Revenue Code of 1986, as amended (the “Code”), and to distribute substantially all of its taxable income and gains to its shareholders and to meet certain diversification and income requirements with respect to investment companies. The Investment Manager has analyzed the Fund’s tax positions taken on federal income tax returns for all open tax years (generally, the three prior taxable years), and has concluded that no provision for federal income tax is required in the Fund’s financial statements. Additionally, the Investment Manager is not aware of any tax position for which it is reasonably possible that the total amounts of unrecognized tax benefit/detriment will change materially in the next twelve months.

Furthermore, based on the Fund’s understanding of the tax rules and rates related to income, gains and transactions for the foreign jurisdictions in which it invests, the Fund will provide for foreign taxes, and where appropriate, deferred foreign taxes.

f. CAPITAL LOSS CARRYOVERS AND DEFERRALS

As of September 30, 2025, the Fund had capital loss carryovers for federal income tax purposes as shown in the following chart. These amounts may be used to offset future realized capital gains indefinitely, and retain their character as short-term and/or long-term.

h. REPURCHASE AGREEMENTS AND JOINT REPURCHASE AGREEMENTS

The Fund may enter into third-party and bilateral repurchase agreements for temporary cash management purposes and for reinvestment of cash collateral on securities lending transactions under the securities lending program offered by The Bank of New York Mellon (“BNYM”) (the “Securities Lending Program”) (collectively, “Repurchase Agreements”). The value of the underlying collateral, including accrued interest, must equal or exceed the value of the Repurchase Agreements during the term of the agreement. For joint repurchase agreements, the Fund participates on a pro rata basis with other clients of BNYM in its share of the underlying collateral under such joint repurchase agreements and in its share of proceeds from any repurchase or other disposition of the underlying collateral. The underlying collateral for all Repurchase Agreements is held by the Fund’s custodian or at the Federal Reserve Bank. If the seller defaults and the value of the collateral declines, or if bankruptcy proceedings commence with respect to the seller of the security, realization of the collateral by the Fund may be delayed or limited. Pursuant to the Securities Lending Program, the Fund is indemnified for such losses by BNYM on joint repurchase agreements.

At March 31, 2026, the Fund had no Repurchase Agreements outstanding.

i. FOREIGN CURRENCY TRANSLATION

The books and records of the Fund are maintained in U.S. Dollars. The value of investments, assets and liabilities denominated in currencies other than U.S. Dollars are translated into U.S. Dollars based upon current foreign exchange rates. Purchases and sales of foreign investments, income and expenses are converted into U.S. Dollars based on currency exchange rates prevailing on the respective dates of such transactions. Net realized and unrealized gain (loss) on foreign currency transactions represent: (1) foreign exchange gains and losses from the sale and holdings of foreign currencies; (2) gains and losses between trade date and settlement date on investment securities transactions and foreign currency exchange contracts; and (3) gains and losses from the difference between amounts of interest and dividends recorded and the amounts actually received.

The Fund does not isolate the net realized and unrealized gain or loss resulting from changes in exchange rates from the fluctuations in market prices of

securities held. Such fluctuations are included with the net realized and unrealized gain or loss on investments.

2. AGREEMENTS AND TRANSACTIONS WITH AFFILIATES

The Trust has entered into an investment advisory agreement under which the Investment Manager, a subsidiary and the U.S. wealth platform of Affiliated Managers Group, Inc. (“AMG”), serves as investment manager to the Fund and is responsible for the Fund’s overall administration and operations. The Investment Manager selects and recommends, subject to the approval of the Board and, in certain circumstances, shareholders, the subadviser for the Fund and monitors the subadviser’s investment performance, security holdings and investment strategies. The Fund’s investment portfolio is managed by Boston Common Asset Management, LLC (“Boston Common”) who serves as subadviser pursuant to a subadvisory agreement with the Investment Manager. AMG owns a minority equity interest in Boston Common.

Investment management fees are paid directly by the Fund to the Investment Manager based on average daily net assets. For the six months ended March 31, 2026, the Fund paid an investment management fee at the annual rate of 0.73% of the average daily net assets of the Fund. The fee paid to Boston Common for its services as subadviser is paid out of the fee the Investment Manager receives from the Fund and does not increase the expenses of the Fund.

The Investment Manager has contractually agreed, through at least February 1, 2027, to waive management fees and/or pay or reimburse fund expenses in order to limit total annual Fund operating expenses after fee waiver and expense reimbursements (exclusive of taxes, interest (including interest incurred in connection with bank and custody overdrafts, and in connection with securities sold short), shareholder servicing fees, distribution and service (12b-1) fees, 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 0.93% of the Fund’s average daily net assets (this annual rate or such other annual rate that may be in effect from time to time, the “Expense Cap”), subject to later reimbursement by the Fund in certain circumstances.

In general, for a period of up to 36 months after the date any amounts are paid, waived or reimbursed by the Investment Manager, the Investment Manager may

recover such amounts from the Fund, provided that such repayment would not cause the Fund’s total annual operating expenses after fee waiver and expense reimbursements (exclusive of the items noted in the parenthetical above) to exceed either (i) the Expense Cap in effect at the time such amounts were paid, waived or reimbursed, or (ii) the Expense Cap in effect at the time of such repayment by 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 Board, 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.

For the six months ended March 31, 2026, the Investment Manager reimbursed the Fund $42,406, and did not recoup any previously reimbursed expenses. At March 31, 2026, the Fund’s expiration of reimbursements subject to recoupment was as follows:

The Trust, on behalf of the Fund, has entered into an amended and restated Administration Agreement under which the Investment Manager serves as the Fund’s administrator (the “Administrator”) and is responsible for certain aspects of managing the Fund’s operations, including administration and shareholder services to the Fund. The Fund pays a fee to the Administrator at the rate of 0.15% per annum of the Fund’s average daily net assets for this service.

The Fund is distributed by AMG Distributors, Inc. (the “Distributor”), a wholly-owned subsidiary of the Investment Manager. The Distributor serves as the distributor and underwriter for the Fund and is a registered broker-dealer and member of the Financial Industry Regulatory Authority, Inc. (“FINRA”). Shares of the Fund will be continuously offered and will be sold directly to prospective purchasers and through brokers, dealers or other financial intermediaries who have executed selling agreements with the Distributor. Generally, the Distributor bears all or a portion of the expenses of providing services pursuant to the distribution agreement, including the payment of the expenses relating to the distribution of prospectuses for sales purposes and any advertising or sales literature.

The Board provides supervision of the affairs of the Trust and other trusts within the AMG Funds Family. The Trustees of the Trust who are not affiliated with the Investment Manager receive an annual retainer and per meeting fees for regular, special and telephonic meetings, and they are reimbursed for out-of-pocket expenses incurred while carrying out their duties as Board members. The Chairman of the Board and the Audit Committee Chair receive additional annual retainers. Certain Trustees and Officers of the Fund are Officers and/or Directors of the Investment Manager, AMG and/or the Distributor.

The Securities and Exchange Commission (the “SEC”) granted an exemptive order that permits certain eligible funds in the AMG Funds Family to lend and borrow money for certain temporary purposes directly to and from other eligible funds in the AMG Funds Family. Participation in this interfund lending program is voluntary

for both the borrowing and lending funds, and an interfund loan is only made if it benefits each participating fund. The Administrator manages the program according to procedures approved by the Board, and the Board monitors the operation of the program. An interfund loan must comply with certain conditions set out in the exemptive order, which are designed to assure fairness and protect all participating funds. The interest earned and interest paid on interfund loans are included on the Statement of Operations as interest income and interest expense, respectively. At March 31, 2026, the Fund had no interfund loans outstanding. The Fund did not lend or borrow during the six months ended March 31, 2026.

3. PURCHASES AND SALES OF SECURITIES

Purchases and sales of securities (excluding short-term securities and U.S. Government Obligations) for the six months ended March 31, 2026, were $87,831,663 and $115,442,877, respectively.

The Fund had no purchases or sales of U.S. Government Obligations during the six months ended March 31, 2026.

4. PORTFOLIO SECURITIES LOANED

The Fund participates in the Securities Lending Program providing for the lending of securities to qualified borrowers. Securities lending income includes earnings of such temporary cash investments, plus or minus any rebate to a borrower. These earnings (after any rebate) are then divided between BNYM, as a fee for its services under the Securities Lending Program, and the Fund, according to agreed-upon rates. Collateral on all securities loaned is accepted in cash, U.S. Treasury Obligations or U.S. Government Agency Obligations. Collateral is maintained at a minimum level of 102% (105% in the case of certain foreign securities) of the market value, plus interest, if applicable, of investments on loan. It is the Fund’s policy to obtain additional collateral from or return excess collateral to the borrower by the end of the next business day, following the valuation date of the securities loaned. Therefore, the value of the collateral held may be temporarily less than the value of the securities on loan. Lending securities entails a risk of loss to the Fund if and to the extent that the market value of the securities loaned were to increase and the borrower did not increase the collateral accordingly, and the borrower fails to return the securities. Under the terms of the Securities Lending Program, the Fund is indemnified for such losses by BNYM. Cash collateral is held in separate omnibus accounts managed by BNYM, who is authorized to exclusively enter into joint repurchase agreements for that cash collateral. Securities collateral is held in separate omnibus accounts managed by BNYM and cannot be sold or pledged. BNYM bears the risk of any deficiency in the amount of the cash collateral available for return to the borrower due to any loss on the collateral invested. Loans of securities are terminable at any time and the borrower, after notice, is required to return borrowed securities as soon as practical, which is normally within three business days.

The Fund did not have any securities on loan at March 31, 2026.

5. SEGMENT REPORTING

The Fund operates through a single operating and reporting segment to achieve its investment objective as reflected in the Fund’s prospectus. The Chief Operating Decision Makers (“CODM”) are the Fund’s president and chief financial officer. The CODM assesses the performance and makes operating decisions for the Fund primarily based on the Fund’s changes in net assets resulting from operations. In addition to other factors and metrics, the CODM utilizes the Fund’s net assets, total return, and ratios of net and gross expenses to average net assets as key metrics

in reviewing the performance of the Fund. As the Fund’s operations comprise a single reporting segment, the segment assets are reflected on the accompanying Statement of Assets and Liabilities as “Total assets” and the significant segment expenses are listed on the Statement of Operations.

6. FUND RISKS

In the normal course of business, the Fund invests in securities or other instruments and may enter into certain transactions, and such activities subject the Fund to various risks. The value of securities or other instruments may also be affected by various factors, including, without limitation: (i) the general economy; (ii) the overall market as well as local, regional or global political and/or social instability; or (iii) currency and price fluctuations. Please refer to the Fund’s current prospectus for additional information about the Fund’s principal risks.

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.

Foreign Investment Risk: Investments in foreign issuers involve additional risks (such as risks arising from less frequent trading, changes in political or social conditions, and less publicly available information about non-U.S. issuers) that differ from those associated with investments in U.S. issuers and may result in greater price volatility.

Emerging Markets Risk: Investments in emerging markets are subject to the general risks of foreign investments, as well as additional risks which can result in greater price volatility. Such additional risks include the risk that markets in emerging market countries are typically less developed and less liquid than markets in developed countries and such markets are subjected to increased economic, political, or regulatory uncertainties.

Currency Risk: Fluctuations in exchange rates may affect the total loss or gain on a non-U.S. dollar investment when converted back to U.S. dollars and exposure to non-U.S. currencies may subject the Fund to the risk that those currencies will decline in value relative to the U.S. dollar.

ESG Investing Risk: Because applying the Fund’s ESG investment criteria may result in the selection or exclusion of securities of certain issuers for reasons other than financial performance, the Fund’s investment returns may underperform funds that do not incorporate ESG factors into their investment process. The incorporation of ESG criteria into the investment process may affect the Fund’s investment exposure to certain companies, sectors, regions, countries or types of investments, which could negatively impact the Fund’s performance depending on whether such investments are in or out of favor. Applying ESG criteria to investment decisions is qualitative and subjective by nature, and there is no guarantee that the criteria utilized by Boston Common or any judgment exercised by Boston Common will improve the financial performance of the Fund or reflect the beliefs or values of any particular investor. ESG standards differ by region and industry, and a company’s ESG practices or Boston Common’s assessment of a company’s ESG practices may change over time. Boston Common’s evaluation of a company also may be dependent on the availability of timely, complete and

accurate ESG data reported by issuers and/or third party data providers. Different methodologies may be used by the various issuers and third party sources that provide ESG data, and such ESG data often lacks standardization, consistency and transparency.

Growth Stock Risk: The prices of equity securities of companies that are expected to experience relatively rapid earnings growth, or “growth stocks,” may be more sensitive to market movements because the prices tend to reflect future investor expectations rather than just current profits.

Large-Capitalization Stock Risk: The stocks of large-capitalization companies are generally more mature and may not be able to reach the same levels of growth as the stocks of small- or mid-capitalization companies.

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 Boston Common’s investment techniques and risk analysis will produce the desired result.

Mid-Capitalization Stock Risk: Although the Fund may invest in securities in any capitalization range, securities of mid-capitalization companies may pose additional risks. The stocks of mid-capitalization companies often have greater price volatility, lower trading volume, and less liquidity than the stocks of larger, more established companies.

Political Risk: Changes in the general political and social environment of a country can have substantial effects on the value of investments exposed to that country.

Sector Risk: Issuers and companies that are in similar industry sectors may be similarly affected by particular economic or market events; to the extent the Fund has substantial holdings within a particular sector, the risks associated with that sector increase.

Small-Capitalization Stock Risk: Although the Fund may invest in securities in any capitalization range, securities of small-capitalization companies may pose additional risks. The stocks of small-capitalization companies often have greater price volatility, lower trading volume, and less liquidity than the stocks of larger, more established companies.

Value Stock Risk: Value stocks may perform differently from the market as a whole and may be undervalued by the market for a long period of time.

7. COMMITMENTS AND CONTINGENCIES

Under the Trust’s organizational documents, its Trustees and Officers are indemnified against certain liabilities arising out of the performance of their duties to the Trust. In addition, in the normal course of business, the Fund may enter into contracts and agreements that contain a variety of representations and warranties, which provide general indemnifications. The maximum exposure to the Fund under these arrangements is unknown, as this would involve future claims that may be made against the Fund that have not yet occurred. However, based on experience, the Fund had no prior claims or losses and expects the risks of loss to be remote.

9. SUBSEQUENT EVENTS

The Fund has determined that no material events or transactions occurred through the issuance date of the Fund’s financial statements which require an additional disclosure in or adjustment of the Fund’s financial statements.