0000879947 afii:S000095116Member afii:ChangingDistributionLevelRiskMember 2025-12-31 2025-12-31 0000879947 afii:S000095116Member afii:CreditRisksMember 2025-12-31 2025-12-31 0000879947 afii:S000095116Member afii:DebtSecuritiesRiskMember 2025-12-31 2025-12-31 0000879947 afii:S000095116Member afii:ETFStructureRisksMember 2025-12-31 2025-12-31 0000879947 afii:S000095116Member afii:ExtensionRiskMember 2025-12-31 2025-12-31 0000879947 afii:S000095116Member afii:HighYieldRiskMember 2025-12-31 2025-12-31 0000879947 afii:S000095116Member afii:InflationDeflationRiskMember 2025-12-31 2025-12-31 0000879947 afii:S000095116Member afii:InterestRateRisksMember 2025-12-31 2025-12-31 0000879947 afii:S000095116Member afii:LiquidityRisksMember 2025-12-31 2025-12-31 0000879947 afii:S000095116Member afii:ManagementRiskMember 2025-12-31 2025-12-31 0000879947 afii:S000095116Member afii:MarketRisksMember 2025-12-31 2025-12-31 0000879947 afii:S000095116Member afii:MunicipalMarketRiskMember 2025-12-31 2025-12-31 0000879947 afii:S000095116Member afii:NewFundRiskMember 2025-12-31 2025-12-31 0000879947 afii:S000095116Member afii:PrepaymentRisksMember 2025-12-31 2025-12-31 0000879947 afii:S000095116Member afii:ReinvestmentRiskMember 2025-12-31 2025-12-31 0000879947 afii:S000095116Member oef:RiskLoseMoneyMember 2025-12-31 2025-12-31 0000879947 afii:S000095116Member oef:RiskNotInsuredDepositoryInstitutionMember 2025-12-31 2025-12-31 0000879947 afii:S000095116Member afii:SectorRiskMember 2025-12-31 2025-12-31 0000879947 2025-12-31 2025-12-31 0000879947 afii:S000095116Member 2025-12-31 2025-12-31 0000879947 afii:S000095116Member afii:C000263709Member 2025-12-31 2025-12-31 iso4217:USD pure 0000879947 false 485BPOS 2025-12-31 N-1A AMG ETF TRUST 2026-05-01 AMG GW&K Muni Income ETF Investment Objective The investment objective of AMG GW&K Muni Income ETF (the “Fund”) is to seek current income exempt from federal income tax, consistent with preservation of capital. Capital appreciation is a secondary objective. Fees and Expenses of the Fund <div style="line-height: 11.5pt; text-align: left;">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.</div> Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) 0.0029 0 0.0000 0.0029 Because the Fund is new, “Other Expenses” are based on estimates for the Fund’s current fiscal year. Expense Example <div style="line-height: 11.5pt; text-align: left;">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. Although your actual costs may be higher or lower, based on the above assumptions, your costs would be:</div> 30 93 Portfolio Turnover <div style="line-height: 11.5pt; text-align: left;">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 (October 29, 2025 through December 31, 2025), the Fund’s portfolio turnover rate was 23% of the average value of its portfolio.</div> 0.23 Principal Investment Strategies <div style="line-height: 11.5pt; text-align: left;">Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in municipal bonds, the income from which is exempt from federal income tax. This policy is fundamental and may not be changed without shareholder approval. In addition, up to 100% of the Fund’s assets may be invested in municipal bonds, the interest on which may be subject to the federal alternative minimum tax. </div> <div style="margin-top: 6pt;">GW&K Investment Management, LLC, the subadviser to the Fund (“GW&K” or the “Subadviser”), will buy municipal bonds of any credit rating. The Fund may invest up to 35% of its total assets in unrated securities and below investment grade securities (commonly known as “junk bonds” or “high yield securities”). The Fund expects that the average credit rating of the Fund’s portfolio will be Baa/BBB or above. In assessing average credit quality, the Fund uses ratings from Moody’s Investors Service, Inc., S&P Global Ratings, or another nationally recognized statistical ratings organization (“NRSRO”). 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 expects to maintain an average effective duration of +/- 25% of the average effective duration of the ICE BofA US Municipal Securities Index1, which was 7.26 years as of February 28, 2026. The Fund’s average weighted portfolio maturity and duration may vary from time to time depending on the Subadviser’s views on the direction of interest rates. </div> <div style="margin-top: 6pt;">In selecting municipal bonds, the Subadviser uses a bottom-up, research-driven process based on its assessment of creditworthiness and geographic diversification of issuers and market availability of municipal bonds. The Subadviser typically invests for the long-term and seeks opportunities across the yield curve while retaining flexibility to react to interest rate shifts. Although the Fund invests nationally and seeks to be diversified by geography and across sectors of the municipal bond market, the Fund may at times invest a significant portion of its assets in a particular state or region or in a particular sector due to market conditions.</div> <div> <div style="line-height: 8.5pt; margin-left: 4pt; margin-top: 4.0pt; text-align: left;"> <div style="margin-top: 4pt;">1ICE BofA US Municipal Securities Index is a product of ICE Data Indices, LLC and is used with permission. ICE® is a registered trademark of ICE Data Indices, LLC or its affiliates, and BofA® is a registered trademark of Bank of America Corporation licensed by Bank of America Corporation and its affiliates ("BofA"), and may not be used without BofA's prior written approval. The index data referenced herein is the property of ICE Data Indices, LLC, its affiliates ("ICE Data") and/or its third party suppliers and, along with the ICE BofA trademarks, has been licensed for use by AMG Funds LLC. ICE Data and its Third Party Suppliers accept no liability in connection with the use of such index data or marks. See amgetfs.com for a full copy of this Disclaimer. </div> </div> </div> There is the risk that you may lose money on your investment. 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. <div style="margin-top: 6pt;">ETF Structure Risks— the Fund is structured as an ETF and is subject to special risks, including: </div> <div style="margin-top: 6pt;">Not Individually Redeemable. Shares are not individually redeemable by retail investors and may be redeemed from the Fund only by Authorized Participants at NAV in large blocks known as “Creation Units.” An Authorized Participant may incur brokerage costs purchasing enough shares to constitute a Creation Unit. </div> <div style="margin-top: 6pt;">Trading Issues. An active trading market for the Fund’s shares may not be developed or maintained. Trading in shares on the NYSE may be halted due to market conditions or for reasons that, in the view of the NYSE, make trading in shares inadvisable, such as extraordinary market volatility. There can be no assurance that shares will continue to meet the listing requirements of the NYSE. If the Fund’s shares are traded outside a collateralized settlement system, the number of financial institutions that can act as Authorized Participants that can post collateral on an agency basis is limited, which may limit the market for the Fund’s shares. In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent the foregoing or either of the following events occur, shares may trade at a material discount to NAV and possibly face delisting: (i) Authorized Participants exit the business or otherwise become unable to process creation and/or redemption orders and no other Authorized Participants step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions. </div> <div style="margin-top: 6pt;">Market Price Variance Risk. The market price of the Fund’s shares will fluctuate in response to changes in NAV and supply and demand for shares and will include a “bid-ask spread” charged by the exchange specialists, market makers or other participants that trade the particular security. There may be times when the market price and the NAV vary significantly. This means that shares may trade at a discount or premium to NAV. </div> <div style="line-height: 11.5pt; text-align: left;">Market Trading Risk. The Fund faces numerous market trading risks, including the potential lack of an active market for Fund shares, losses from trading in secondary markets, periods of high volatility and disruptions in the creation/redemption process. Any of these factors, among others, may lead to the Fund’s shares trading at a premium or discount to NAV. </div> <div style="margin-top: 6pt;">Fluctuation of Net Asset Value Risk. The NAV of the Fund’s shares will generally fluctuate with changes in the market value of the Fund’s holdings. The market prices of the Fund’s shares will generally fluctuate in accordance with changes in NAV as well as the relative supply of and demand for the Fund’s shares on the NYSE. The Investment Manager cannot predict whether the shares will trade below, at or above their NAV. Price differences may be due, because of, among other factors, the fact that supply and demand forces at work in the secondary trading market for the Fund’s shares. It is expected that these forces generally will be closely related to, but not identical to, the same forces influencing the prices of the Fund’s holdings trading individually or in the aggregate at any point in time. </div> <div style="margin-top: 6pt;">Authorized Participant Concentration Risk. Only an Authorized Participant may engage in creation or redemption transactions directly with the Fund, and no Authorized Participant is obligated to engage in creation and/or redemption transactions. The Fund has a limited number of institutions that may act as Authorized Participants, none of which are or will be obligated to engage in creation or redemption transactions. To the extent that Authorized Participants exit the business or are unable to proceed with creation or redemption orders with respect to the Fund and no other Authorized Participant is able to step forward to create or redeem Creation Units, Fund shares may be more likely to trade at a premium or discount to NAV and possibly face trading halts or delisting.</div> <div style="margin-top: 6pt;">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.</div> <div style="margin-top: 6pt;">Municipal Market Risk—factors unique to the municipal bond market may negatively affect the value of municipal bonds. These factors include political or legislative changes, and uncertainties related to the tax status of the securities and the rights of investors in the securities. The Fund may invest in a group of municipal obligations that are related in such a way that an economic, business, or political development affecting one would also affect the others.</div> <div style="margin-top: 6pt;">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.</div> <div style="line-height: 11.5pt; text-align: left;">Credit Risk—the issuer of bonds or other debt securities may be unable or unwilling, or may be perceived as unable or unwilling, to make timely interest or principal 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.</div> <div style="margin-top: 6pt;">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.</div> <div style="margin-top: 6pt;">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 the Fund’s income or net capital gains arising from its investments may reduce its distribution level.</div> <div style="margin-top: 6pt;">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.</div> <div style="margin-top: 6pt;">High Yield Risk—below investment grade debt securities and unrated securities of similar credit quality (commonly known as “junk bonds” or “high yield securities”) may be subject to greater levels of interest rate, credit, liquidity, and market risk than higher-rated securities. These securities are considered predominately speculative with respect to the issuer’s continuing ability to make principal and interest payments.</div> <div style="margin-top: 6pt;">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.</div> <div style="margin-top: 6pt;">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.</div> <div style="margin-top: 6pt;">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 </div> <div style="line-height: 11.5pt; text-align: left;">infectious illness or other public health issues, including epidemics or pandemics, or in response to events that affect particular industries or companies.</div> <div style="margin-top: 6pt;">New Fund Risk—the Fund is a new fund, which may result in additional risk. There can be no assurance that the Fund will grow to an economically viable size, in which case the Fund may cease operations. In such an event, investors may be required to liquidate or transfer their investments at an inopportune time. In addition, until the Fund achieves sufficient scale, a Fund shareholder may experience proportionally higher Fund expenses than would be experienced by shareholders of a fund with a larger asset base.</div> <div style="margin-top: 6pt;">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.</div> <div style="margin-top: 6pt;">Reinvestment Risk—the Fund may have difficulty reinvesting payments from debtors and may receive lower rates than from its original investments.</div> <div style="margin-top: 6pt;">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. A portion of the Fund's assets may be invested in fixed income securities that would tend to respond similarly to particular economic or political developments or the interest on which is based on revenues or otherwise related to similar types of projects. An example would be securities of issuers whose revenues are paid from similar types of projects, such as utilities or transportation.</div> Performance <div style="line-height: 11.5pt; margin-top: 0.0pt; text-align: left;">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.</div> 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. Because the Fund is new, “Other Expenses” are based on estimates for the Fund’s current fiscal year.