AMG Funds

	Summary Prospectus	May 1, 2021 (as revised January 14, 2022)
	AMG TimesSquare International Small Cap Fund

Class N: TCMPX

Class I: TQTIX

Class Z: TCMIX

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://www.amgfunds.com/resources/order_literature.html. 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, 2021, as revised or supplemented from time to time, are incorporated by reference into this summary prospectus.

Investment Objective

The AMG TimesSquare International Small Cap Fund's (the “Fund”) investment objective is to seek long-term 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)

	Class N	Class I	Class Z
Management Fee	0.75%	0.75%	0.75%
Distribution and Service (12b-1) Fees	None	None	None
Other Expenses	0.48%	0.33%	0.23%
Total Annual Fund Operating Expenses	1.23%	1.08%	0.98%

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. 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
Class N	$125	$390	$676	$1,489
Class I	$110	$343	$595	$1,317
Class Z	$100	$312	$542	$1,201

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 57% of the average value of its portfolio.

Principal Investment Strategies

Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in equity securities (generally common and preferred stocks) of small market capitalization companies (“small cap companies”). Additionally, under normal circumstances, the Fund will invest at least 40% of its net assets, plus the amount of any borrowing for investment purposes, in investments of issuers located outside the United States, and/or investments that expose the Fund to such issuers, and the Fund will invest in and/or have investments that expose the Fund to a minimum of three countries, excluding the United States. The Fund considers an issuer to be located outside the United States if the issuer maintains a principal place of business outside the United States, its securities are traded principally outside the United States, or it derives at least 50% of its revenues or profits from goods produced or sold, investments made, or services performed outside the United States or it has at least 50% of its assets outside the United States.

The Fund primarily invests in non-U.S. small cap companies, allocating investments across different countries and regions. The Subadviser considers non-U.S. small cap companies to be those with market capitalizations at the time of purchase within the range of capitalizations of companies in the MSCI EAFE Small Cap Index. As of March 1, 2021, the date of the latest rebalance of the MSCI EAFE Small Cap Index, the range of market capitalizations was $98.59 million to $7.72 billion. This capitalization range will change over time. The Fund may continue to hold securities of a portfolio company whose market capitalization subsequently drops below or appreciates above the Fund’s small market capitalization range. Because of this, the Fund may have less than 80% of its net assets in equity securities of small cap companies at any given time. The Fund may invest in securities of issuers located in emerging markets countries. To gain exposure to foreign issuers, the Fund also may invest in American Depositary Receipts (“ADRs”), Global Depositary Receipts (“GDRs”) and other depositary receipts of non-U.S. listed companies.

TimesSquare Capital Management, LLC, the subadviser to the Fund (“TimesSquare” or the “Subadviser”), uses a bottom-up investment process driven by fundamental research conducted by its investment analysts. Under normal circumstances, the

SUM058-0122

AMG TimesSquare International Small Cap Fund SUMMARY PROSPECTUS

Subadviser seeks to maintain a growth oriented focus and invest the Fund’s assets pursuant to the following core principles:

•	Revenue growth and profitability should drive equity returns over the long term.
•	Early-stage and traditional growth companies should provide the greatest opportunity.
•	Risk management with respect to the Fund’s portfolio should focus on avoiding losing money, rather than minimizing tracking error against the benchmark.
•	A disciplined investment process requires consistently identifying opportunities, evaluating potential returns and responding with timely buy/sell decisions.

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.

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.

Market Risk—market prices of investments held by the Fund may fall rapidly or unpredictably due to a variety of factors, including economic, political, 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 such as the COVID-19 outbreak, or in response to events that affect particular industries or companies.

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.

Small-Capitalization Stock Risk—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.

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.

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. The values of foreign 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.

Geographic Focus Risk—to the extent the Fund focuses its investments in a particular country, group of countries or geographic region, the Fund is particularly susceptible to economic, political, regulatory or other events or conditions affecting such countries or region, and the Fund’s NAV may be more volatile than the NAV of a more geographically diversified fund and may result in losses.

Japan. The Fund is highly susceptible to the social, political, economic, regulatory and other conditions or events that may affect Japan’s economy. The Japanese economy is heavily dependent upon international trade, and, therefore, is particularly exposed to the risks of currency fluctuation, foreign trade policy and regional and global economic disruption, including the risk of increased tariffs, embargoes, and other trade limitations or factors. Japanese government policy has been characterized by economic regulation, intervention, protectionism and large government deficits. The Japanese economy is also challenged by an unstable financial services sector, highly leveraged corporate balance sheets and extensive cross-ownership among major corporations. Structural social and labor market changes, including an aging workforce, population decline and traditional aversion to labor mobility may adversely affect Japan’s economic competitiveness and growth potential. The potential for natural disasters, such as earthquakes, volcanic eruptions, typhoons and tsunamis, could also have significant negative effects on Japan’s economy.

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.

AMG Funds

AMG TimesSquare International Small Cap Fund SUMMARY PROSPECTUS

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. Stocks in the industrials sector may comprise a significant portion of the Fund's portfolio. The industrials sector may be affected by general economic trends, including employment, economic growth and interest rates, changes in consumer confidence and spending, government regulation, commodity prices and competitive pressures.

Performance

The following performance information illustrates the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s performance compares to that of a broad-based securities market index. As always, past performance of the Fund (before and after taxes) is not an indication of how the Fund will perform in the future. Effective February 27, 2017, outstanding Class S shares (formerly Premier Class shares, which were renamed Class S shares on October 1, 2016) and Class I shares (formerly Institutional Class shares, which were renamed Class I shares on October 1, 2016) were renamed Class N and Class Z shares, respectively. Also effective February 27, 2017, the Fund established an additional share class: Class I. To obtain updated performance information please visit www.amgfunds.com or call 800.548.4539.

Calendar Year Total Returns as of 12/31/20 (Class N)

Best Quarter: 23.98% (2nd Quarter 2020)
Worst Quarter: -28.88% (1st Quarter 2020)

Average Annual Total Returns as of 12/31/20
AMG TimesSquare International Small Cap Fund	1 Year	5 Years	Since Inception
Class N Return Before Taxes	13.55%	8.89%	10.30% ¹
Class N Return After Taxes on Distributions	13.55%	8.71%	9.75% ¹
Class N Return After Taxes on Distributions and Sale of Fund Shares	8.02%	7.05%	8.22% ¹

Average Annual Total Returns as of 12/31/20 (continued)
AMG TimesSquare International Small Cap Fund	1 Year	5 Years	Since Inception
Class I Return Before Taxes	13.75%	—	10.30% ²
Class Z Return Before Taxes	13.90%	9.15%	10.53% ¹
MSCI EAFE Small Cap Index (reflects no deduction for fees, expenses, or taxes)	12.34%	9.40%	9.57% ¹
MSCI EAFE Small Cap Index (reflects no deduction for fees, expenses, or taxes)	12.34%	9.40%	10.28% ²

¹	Class Z, Class N and Index performance shown reflects performance since the inception date of the Fund's Class Z and Class N shares on January 2, 2013.
²	Class I and Index performance shown reflects performance since the inception date of the Fund's Class I shares on February 24, 2017.

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. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold their Fund shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”). After-tax returns are shown for Class N shares only, and after-tax returns for Class I and Class Z shares will vary.

Portfolio Management

Investment Manager

AMG Funds LLC

Subadviser

TimesSquare Capital Management, LLC

Portfolio Managers

Magnus Larsson
Director, Portfolio Manager and Partner of TimesSquare;
Lead Portfolio Manager of the Fund since 1/13.

David Hirsh
Director, Portfolio Manager/Analyst – Europe, and Partner of TimesSquare;
Portfolio Manager of the Fund since 1/22.

Buying and Selling Fund Shares

Initial Investment Minimum

Class N

Regular Account: $2,000
Individual Retirement Account: $1,000

Class I

Regular Account: $100,000
Individual Retirement Account: $25,000

Class Z^*

Regular Account: $5,000,000
Individual Retirement Account: $50,000

AMG Funds

AMG TimesSquare International Small Cap Fund SUMMARY PROSPECTUS

Additional Investment Minimum

Class N and Class I (all accounts): $100
Class Z (all accounts): $1,000

^*Individual retirement accounts may only invest in Class Z shares by purchasing shares directly from the Fund.

TRANSACTION POLICIES

You may purchase or sell your shares of the Fund any day that the New York Stock Exchange is open for business, either through your registered investment professional or directly with the Fund. Shares may be purchased, sold or exchanged by mail at the address listed below, by phone at 800.548.4539, online at www.amgfunds.com, or by bank wire (if bank wire instructions are on file for your account).

AMG Funds
c/o BNY Mellon Investment Servicing (US) Inc.
P.O. Box 9769
Providence, RI 02940-9769

Tax Information

The Fund intends to make distributions that are taxable to you as ordinary income, qualified dividend income or capital gains, except when your investment is in 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 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 over another investment. Ask your salesperson or visit your financial intermediary’s website for more information.

AMG Funds