AMG River Road Focused Absolute Value Fund

<b>AMG River Road Focused Absolute Value Fund</b>

<b>INVESTMENT OBJECTIVE</b>

The Fund seeks to provide long-term capital appreciation.

<b>FEES AND EXPENSES OF THE FUND</b>

The table below describes the fees and expenses that you may pay if you buy and hold shares of the Fund. If you transact in Class I shares of the Fund through a financial intermediary, you may be required to pay a commission to the financial intermediary for effecting such transactions. Such commissions are charged by the financial intermediary and are not reflected in the table or Expense Example below.

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

Annual Fund Operating Expenses - AMG River Road Focused Absolute Value Fund		Class N	Class I	Class Z
Management Fee		0.60%	0.60%	0.60%
Distribution and Service (12b-1) Fees		0.25%	none	none
Other Expenses	[1]	0.47%	0.47%	0.43%
Acquired Fund Fees and Expenses	[2]	0.21%	0.21%	0.21%
Total Annual Fund Operating Expenses	[2]	1.53%	1.28%	1.24%
Fee Waiver and Expense Reimbursements	[3]	(0.32%)	(0.32%)	(0.32%)
Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursements	[2],[3]	1.21%	0.96%	0.92%

<b>EXPENSE EXAMPLE</b>

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 Example includes the Fund’s contractual expense limitation through March 1, 2020. Although your actual costs may be higher or lower, based on the above assumptions, your costs would be:

Expense Example - AMG River Road Focused Absolute Value Fund - USD ($)	1 Year	3 Years	5 Years	10 Years
Class N	123	452	804	1,796
Class I	98	374	672	1,517
Class Z	94	362	650	1,472

<b>PORTFOLIO TURNOVER</b>

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 88% of the average value of its portfolio.

<b>PRINCIPAL INVESTMENT STRATEGIES</b>

The Fund principally invests in a portfolio of equity securities of U.S. and non-U.S. companies and may invest in securities of all market capitalizations. Under normal conditions, the Fund intends to invest its assets in the equity securities of a limited number of issuers. In pursuing its investment strategy, the Fund will primarily invest in common stocks, real estate investment trusts (“REITs”) and publicly traded partnerships (“PTPs”), including, but not limited to, master limited partnerships (“MLPs”). The Fund may invest in non U.S. companies through depositary receipts or by directly investing in securities listed on foreign exchanges. The Fund may also invest in other investment companies, including open-end funds, closed-end funds and exchange-traded funds (“ETFs”).

The investment philosophy of River Road Asset Management, LLC, the subadviser to the Fund (“River Road” or the “Subadviser”), is based upon its proprietary Absolute Value® approach, which seeks to provide attractive, sustainable, low volatility returns over the long term, while reducing downside portfolio risk. The Subadviser uses systematic and dynamic proprietary research to analyze companies based on investment criteria such as one or more of the following:

• Security price that is at a discount to assessed valuation as determined by the Subadviser’s unique and proprietary Absolute Value® approach

• Attractive business model

• Shareholder-oriented management

• Financial strength

• Undiscovered, underfollowed or misunderstood companies

In managing the Fund, the Subadviser employs an all-cap strategy that focuses on a limited number of securities representing the Subadviser’s “best ideas” across all of its core strategies. These “best ideas” are the result of the Subadviser’s risk/reward assessment, which is based on the Subadviser’s conviction about a company and opinion about the company’s discount to valuation.

To seek to manage risk, the Subadviser employs a structured sell discipline.

The Subadviser’s investment strategy is highly opportunistic and may result in high portfolio turnover.

The Fund is classified as non-diversified.

<b>PRINCIPAL RISKS</b>

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 described in alphabetical order and not in the order of importance or potential exposure.

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.

Focused Investment Risk—to the extent the Fund invests a substantial portion of its assets in a relatively small number of securities or a particular market, industry, group of industries, country, region, group of countries, asset class or sector, it generally will be subject to greater risk than a fund that invests in a more diverse investment portfolio. In addition, the value of the Fund would be more susceptible to any single economic, market, political or regulatory occurrence affecting, for example, that particular market, industry, region or sector.

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.

High Portfolio Turnover Risk—higher portfolio turnover may adversely affect Fund performance by increasing Fund transaction costs and may increase a shareholder’s tax liability.

Investment Company Risk—the risks of investing in other investment companies, including ETFs, open-end funds and closed-end funds, typically reflect the risks of the types of securities in which those investment companies invest. The market value returns of closed-end funds and ETFs may lag their returns at net asset value. When the Fund invests in another investment company, shareholders of the Fund bear their proportionate share of the other investment company’s fees and expenses as well as their share of the Fund’s fees and expenses.

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.

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 in response to events that affect particular industries or companies.

Master Limited Partnerships— investments in master limited partnerships are subject to similar risks to those associated with the specific industry or industries in which the partnership invests, such as the risk of investing in the real estate or oil and gas industries. In addition, investments in master limited partnerships are subject to the risks of investing in a partnership, including limited control and voting rights on matters affecting the partnership and fewer investor protections compared to corporations.

Non-Diversified Fund Risk—the Fund is non-diversified and therefore a greater percentage of holdings may be focused in a small number of issuers or a single issuer, which can place the Fund at greater risk. Notwithstanding the Fund’s status as a “non-diversified” investment company under the Investment Company Act of 1940 (the “1940 Act”), the Fund intends to qualify as a regulated investment company accorded special tax treatment under the Internal Revenue Code of 1986, as amended (the “Internal Revenue Code”), which imposes its own diversification requirements that are less restrictive than the requirements applicable to “diversified” investment companies under the 1940 Act. The Fund’s intention to qualify as a regulated investment company may limit its pursuit of its investment strategy and its investment strategy could limit its ability to so qualify.

PTP Risk— investing in PTPs (including master limited partnerships) involves special risks in addition to those typically associated with publicly traded companies. PTPs are exposed to the risks of their underlying assets, which in many cases includes the same types of risks as energy and natural resources companies, such as commodity pricing risk, supply and demand risk and depletion and exploration risk. PTPs are also subject to capital markets risk, which is the risk that they may be unable to raise capital to execute their growth strategies. PTPs are also subject to tax risk, which is the risk that PTPs may lose their partnership status for tax purposes. The Fund’s ability to make investments in certain PTPs, including master limited partnerships, can be limited by the Fund’s intention to qualify as a regulated investment company, and if the Fund does not appropriately limit such investments or if such investments are recharacterized for U.S. federal income tax purposes, the Fund’s status as a regulated investment company may be jeopardized.

Real Estate Industry Risk—investments in the Fund may be subject to many of the same risks as a direct investment in real estate. The stock prices of companies in the real estate industry, including REITs, are typically sensitive to changes in real estate values, property taxes, interest rates, cash flow of underlying real estate assets, occupancy rates, government regulations affecting zoning, land use, and rents, as well as the management skill and creditworthiness of the issuer. REITs also depend generally on their ability to generate cash flow to make distributions to shareholders or unitholders and are subject to the risk of failing to qualify for favorable tax treatment under the Internal Revenue Code.

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 consumer discretionary, industrials and financials sectors may comprise a significant portion of the Fund's portfolio. The consumer discretionary sector may be affected by the performance of the overall economy, consumer confidence and spending, changes in demographic and consumer tastes, interest rates, and competitive pressures. 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. Unique risks of the financial sector include, but are not limited to, government regulation uncertainty, yield curve fluctuation, asset flow fluctuation, and capital market fluctuations.

Small- and Mid-Capitalization Stock Risk—the stocks of small- and mid-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.

<b>PERFORMANCE</b>

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. To obtain updated performance information please visit www.amgfunds.com or call 800.548.4539.

Calendar Year Total Returns as of 12/31/18 (Class N)

Best Quarter: 9.01% (4th Quarter 2016)
Worst Quarter: -12.63% (4th Quarter 2018)

Average Annual Total Returns as of 12/31/18

Average Annual Total Returns - AMG River Road Focused Absolute Value Fund	1 Year	Since Inception		Inception Date
Class N	(3.95%)	7.54%	[1]	Nov. 03, 2015
Class N | Return After Taxes on Distributions	(6.25%)	4.96%	[1]	Nov. 03, 2015
Class N | Return After Taxes on Distributions and Sale of Fund Shares	(1.88%)	5.00%	[1]	Nov. 03, 2015
Class N | Russell 3000® Value Index (reflects no deduction for fees, expenses, or taxes)	(8.58%)	5.53%	[1]	Nov. 03, 2015
Class I	(3.83%)	7.79%	[1]	Nov. 03, 2015
Class I | Russell 3000® Value Index (reflects no deduction for fees, expenses, or taxes)	(8.58%)	5.53%	[1]	Nov. 03, 2015
Class Z	(3.71%)	(2.46%)	[2]	Sep. 29, 2017
Class Z | Russell 3000® Value Index (reflects no deduction for fees, expenses, or taxes)	(8.58%)	(3.17%)	[2]	Sep. 29, 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.

[1] Expense information has been restated to reflect current fees.

[2] The Total Annual Fund Operating Expenses and Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursements do not correlate to the ratios of expenses to average net assets in the Financial Highlights section of this Prospectus, which reflect only the operating expenses of the Fund and do not include fees and expenses of any acquired fund.

[3] AMG Funds LLC (the “Investment Manager”) has contractually agreed, through at least March 1, 2020, to waive management fees and/or pay or reimburse the Fund’s 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 0.71% 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 Fund 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 AMG Funds IV 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.

[1] Class N, Class I and Index performance shown reflects performance since the inception date of the Fund’s Class N and Class I shares on November 3, 2015.

[2] Class Z performance shown reflects performance since the inception date of the Fund’s Class Z shares on September 29, 2017.