Nationwide Strategic Income Fund

(formerly, Nationwide Amundi Strategic Income Fund)

Summary Prospectus August 26, 2026

Class/Ticker A NWXEX R6 NWXGX Institutional Service Class NWXHX

Before you invest, you may want to review the Fund’s Prospectus, which contains information about the Fund and its risks. The Fund’s Prospectus and Statement of Additional Information, each dated March 2, 2026 (as may be supplemented or revised), are incorporated by reference into this Summary Prospectus. For free paper or electronic copies of the Fund’s Prospectus and other information about the Fund, go to nationwide.com/mutualfundprospectuses, email a request to web_help@nationwide.com or call 800-848-0920, or ask any financial advisor, bank, or broker-dealer who offers shares of the Fund.

Objective

The Nationwide Strategic Income Fund seeks to provide a high level of current income.

Fees and Expenses

This table 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. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in the Fund. More information about these and other discounts is available from your financial professional and in “Investing with Nationwide Funds” commencing on page 37 of the Prospectus and in “Additional Information on Purchases and Sales” commencing on page 93 of the Statement of Additional Information. In addition, if you purchase shares through a specific intermediary, you may be subject to different sales charges including reductions in or waivers of such charges. More information about these intermediary-specific sales charge variations is available in Appendix A to the Fund’s Prospectus.

Shareholder Fees (fees paid directly from your investment)

	Class A Shares	Class R6 Shares	Institutional Service Class Shares
Maximum Sales Charge (Load) imposed on purchases (as a percentage of offering price)	2.25%	None	None

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

	Class A Shares	Class R6 Shares	Institutional Service Class Shares
Management Fees	0.52%	0.52%	0.52%
Distribution and/or Service (12b-1) Fees	0.25%	None	None
Other Expenses	0.23%	0.07%	0.19%
Total Annual Fund Operating Expenses	1.00%	0.59%	0.71%
Fee Waiver/Expense Reimbursement(1)	(0.10)%	(0.10)%	(0.10)%
Total Annual Fund Operating Expenses After Fee Waiver/Expense Reimbursement	0.90%	0.49%	0.61%

(1) Nationwide Mutual Funds (the “Trust”) and Nationwide Fund Advisors (the “Adviser”) have entered into a written contract limiting annual fund operating expenses to 0.49% until at least

March 2, 2027. Under the expense limitation agreement, the level to which operating expenses are limited applies to all share classes, excluding any taxes, interest, compensation payable to

parties not affiliated with the Adviser for the recovery of tax reclaims, brokerage commissions, Rule 12b-1 fees, acquired fund fees and expenses, short-sale dividend expenses, administrative services fees, other expenses which are capitalized in accordance with generally accepted accounting principles and expenses incurred by the Fund in connection with any merger or reorganization, and may exclude other nonroutine expenses not incurred in the ordinary course of the Fund’s business. The expense limitation agreement may be changed or eliminated only with the consent of the Board of Trustees of the Trust. The Adviser may request and receive reimbursement from the Fund for advisory fees waived or other expenses reimbursed by the Adviser pursuant to the expense limitation agreement at a date not to exceed three years from the date in which the corresponding waiver or reimbursement to the Fund was made. However, no reimbursement may be made unless: (i) the Fund’s assets exceed $100 million and (ii) the total annual expense ratio of the class making such reimbursement is no higher than the amount of the expense limitation that was in place at the time the Adviser waived the fees or reimbursed the expenses and does not cause the expense ratio to exceed the current expense limitation. Reimbursement by the Fund of amounts previously waived or reimbursed by the Adviser is not permitted except as provided for in the expense limitation agreement.

Example

This Example is intended to help you to compare the cost of investing in the Fund with the cost of investing in other mutual funds.

SP-SI (8/26)

Summary Prospectus August 26, 2026

Nationwide Strategic Income Fund

The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then sell all of your shares at the end of those time periods. It assumes a 5% return each year and no change in expenses, and any expense limitation or fee waivers that may apply for the periods indicated above under “Fees and Expenses.” Although your actual costs may be higher or lower, based on these assumptions your costs would be:

	1 Year	3 Years	5 Years	10 Years
Class A Shares	$315	$527	$756	$1,413
Class R6 Shares	50	179	319	728
Institutional Service Class Shares	62	217	385	873

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 290.32% of the average value of its portfolio.

Principal Investment Strategies

The Fund employs a flexible investment approach, allocating across different types of debt securities with few limitations as to credit quality, geography, maturity or sector, with the goal of achieving a high level of current income. The Fund may invest in U.S. government securities and foreign government bonds, as well as U.S. and foreign corporate bonds and debentures, asset-backed securities, mortgage-backed securities (including collateralized mortgage obligations) and convertible bonds. The Fund also may invest in corporate loans. Securities in which the Fund invests pay interest on either a fixed-rate or a variable-rate basis. The Fund may invest in securities issued by foreign issuers, including those that are located in emerging market countries, although the Fund does not invest more than 65% of its net assets, at the time of purchase, in emerging market securities. Emerging market countries include certain countries located in Latin America, Asia, Africa, the Middle East, and developing countries of Europe, primarily Eastern Europe. Many foreign securities are denominated in currencies other than the U.S. dollar.

The Fund may invest without limitation in debt securities of any maturity, duration or credit quality. Accordingly, the Fund may invest a substantial portion of its portfolio in high-yield bonds (i.e., “junk bonds”) and other securities that are lower-rated. Some of these debt securities may be in default or at high risk of defaulting, and may have extremely poor prospects for being able to make principal and interest payments.

The Fund’s subadviser may use derivatives, such as futures and forward foreign currency contracts, either to increase returns, to hedge against international currency exposure, or to manage the Fund’s average portfolio duration. The subadviser also may buy or sell credit default swaps either to hedge against investment risks or to increase return.

The Fund’s subadviser does not manage the Fund specific to any index or benchmark, which provides it with flexibility to allocate to and rotate across any sector in the fixed-income universe. This strategy is designed to provide exposure to those areas of the fixed-income market that the subadviser anticipates will provide value, while attempting to minimize exposure to those areas it anticipates will not provide value. In managing the Fund, the subadviser considers fundamental market factors such as yield and credit quality differences among bonds, as well as demand and supply trends. The subadviser also makes investment decisions based on technical factors such as price momentum, market sentiment, and supply or demand imbalances. The Fund may engage in active and frequent trading of portfolio securities.

Principal Risks

The Fund cannot guarantee that it will achieve its investment objective.

As with any fund, the value of the Fund’s investments—and therefore, the value of Fund shares—may fluctuate. These changes may occur because of:

Market risk – the risk that one or more markets in which the Fund invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. This occurs due to numerous factors, including interest rates, the outlook for corporate profits, the health of the national and world economies, and the fluctuation of other securities markets around the

Summary Prospectus August 26, 2026

Nationwide Strategic Income Fund

world. These risks may be magnified if certain social, political, economic and other conditions and events (such as natural disasters, epidemics and pandemics, terrorism, conflicts, trade disputes and social unrest or rapid technological developments such as artificial intelligence) adversely interrupt the global economy.

Interest rate risk – generally, when interest rates go up, the value of debt securities goes down. Prices of longer-term securities generally change more in response to interest rate changes than prices of shorter-term securities. To the extent the Fund invests a substantial portion of its assets in debt securities with longer-term maturities, rising interest rates are more likely to cause periods of increased volatility and redemptions, and will cause the value of the Fund's investments to decline significantly. The Federal Reserve Board continued to lower interest rates following a period of consistent rate increases, though it is unclear if such lowering will continue. The interest earned on the Fund's investments in debt securities may decline when prevailing interest rates fall. Declines in interest rates increase the likelihood that debt obligations will be pre-paid, which, in turn, increases these risks. Very low or negative interest rates will impact the yield of the Fund's investments in debt securities and increase the risk that, if followed by rising interest rates, the Fund's performance will be negatively impacted. The Fund is subject to the risk that the income generated by its investments in debt securities may not keep pace with inflation. Recent and potential future changes in government policy may affect interest rates.

Credit risk – a bond issuer will default if it is unable to pay the interest or principal when due. If an issuer defaults, the Fund will lose money. This risk is particularly high for high-yield bonds and other securities rated below investment grade. Changes in a bond issuer’s credit rating or the market’s perception of an issuer’s creditworthiness also affect the market price of a bond.

High-yield bonds risk – investing in high-yield bonds (i.e., “junk bonds”) and other lower-rated bonds is considered speculative and will subject the Fund to substantial risk of loss due to issuer default, decline in market value due to adverse economic and business developments, sensitivity to changing interest rates, or lack of liquidity.

Prepayment and call risk – certain bonds will be paid off by the issuer more quickly than anticipated. If this happens, the Fund may be required to invest the proceeds in securities with lower yields.

Convertible securities risk - the values of convertible securities typically fall when interest rates rise and increase when interest rates fall. The prices of convertible securities with longer maturities tend to be more volatile than those with shorter maturities. Value also tends to change whenever the

market value of the underlying common or preferred stock fluctuates. The Fund will lose money if the issuer of a convertible security is unable to meet its financial obligations.

Corporate loans risk – commercial banks and other financial institutions or institutional investors make corporate loans to companies that need capital to grow or restructure. Borrowers generally pay interest on corporate loans at rates that change in response to changes in market interest rates or the prime rates of U.S. banks. The market for corporate loans may be subject to irregular trading activity, wide bid/ask spreads (difference between the highest price a buyer is willing to pay for an asset and the lowest price that a seller is willing to accept for an asset) and extended trade settlement periods. Corporate loans have speculative characteristics and high risk, and often are referred to as “junk.” Furthermore, investments in corporate loans may not be considered “securities” for certain federal securities laws, and therefore the Fund may not be able to rely on the antifraud protections of the federal securities laws.

Mortgage-backed and asset-backed securities risks – these securities generally are subject to the same types of risk that apply to other debt securities, such as interest rate risk, credit risk, and prepayment and call risk. Mortgage-backed securities also are subject to extension risk, which is the risk that when interest rates rise, certain mortgage-backed securities will be paid in full by the issuer more slowly than anticipated. This can cause the market value of the security to fall because the market may view its interest rate as low for a longer-term investment. Through its investments in mortgage-backed securities, the Fund may have some exposure to subprime loans, as well as to the mortgage and credit markets generally. Subprime loans, which are loans made to borrowers with weakened credit histories, generally have higher default rates than loans that meet government underwriting requirements. The credit quality of most asset-backed securities depends primarily on the credit quality of the assets underlying such securities, how well the entity issuing the security is insulated from the credit risk of the originator or any other affiliated entities, and the amount and quality of any credit enhancement of the securities.

Collateralized mortgage obligations risk – collateralized mortgage obligations exhibit similar risks to those of mortgage-backed securities but also present certain special risks. Collateralized mortgage obligations are created by dividing the principal and interest payments collected on a pool of mortgages into several revenue streams (tranches) with different priority rights to portions of the underlying mortgage payments. Collateralized mortgage obligation tranches often are specially structured in a manner that provides a variety of investment characteristics, such as yield, effective maturity and interest rate sensitivity. As market conditions change, however, particularly during periods of rapid or unanticipated changes in interest rates, the ability of a collateralized mortgage obligation tranche to provide the

Summary Prospectus August 26, 2026

Nationwide Strategic Income Fund

anticipated investment characteristics and performance may be significantly reduced. These changes may result in volatility in the market value, and in some instances reduced liquidity, of the collateralized mortgage obligation tranche.

Derivatives risk – derivatives may be volatile and may involve significant risks. The underlying security, measure or other instrument on which a derivative is based, or the derivative itself, may not perform as expected. Normally derivatives involve leverage, which means that their use can magnify significantly the effect of price movements of the underlying securities or reference measures, disproportionately increasing the Fund’s losses and reducing the Fund’s opportunities for gains. Some derivatives have the potential for unlimited loss, including a loss that may be greater than the amount invested. They also present default risks if the counterparty to a derivatives contract fails to fulfill its obligations to the Fund. Certain derivatives held by the Fund may be illiquid, including non-exchange-traded or over-the-counter derivatives that are linked to illiquid instruments or illiquid markets, making it difficult to close out an unfavorable position. Finally, the Fund's use of derivatives may cause the Fund to realize higher amounts of short-term capital gains (generally taxed at ordinary income tax rates) than if the Fund had not used such instruments. Derivatives also may be more difficult to purchase, sell or value than other instruments.

Currency exposure – the Fund’s investments in currency futures and forward foreign currency exchange contracts (collectively, “currency contracts”) may involve a small investment relative to the amount of risk assumed. To the extent the Fund enters into these transactions, its success will depend on the subadviser’s ability to predict market movements, and their use may have the opposite effect of that intended. Risks include potential loss due to the imposition of controls by a government on the exchange of foreign currencies, the loss of any premium paid to enter into the transaction, delivery failure, default by the other party, or inability to close out a position because the trading market becomes illiquid. Currency contracts may reduce the risk of loss from a change in the value of a currency, but they also limit any potential gains and do not protect against fluctuations in the value of the underlying security.

Futures – the prices of futures contracts typically are more volatile than those of stocks and bonds. Small movements in the values of the assets or measures of underlying futures contracts can cause disproportionately larger losses to the Fund. While futures may be more liquid than other types of derivatives, they may experience periods when they are less liquid than stocks, bonds or other investments.

Forwards – using forwards can involve greater risks than if the Fund were to invest directly in the underlying securities or assets. Because forwards often involve leverage, their use can significantly magnify the effect of price movements of the underlying securities or reference measures, disproportionately increasing the Fund’s losses and reducing

the Fund’s opportunities for gains. Currently there are few central exchanges or markets for forward contracts, and therefore they may be less liquid than exchange-traded instruments. If a forward counterparty fails to meet its obligations under the contract, the Fund will lose money.

Credit default swaps – credit default swaps are subject to credit risk on the underlying investment and to counterparty credit risk. If the counterparty fails to meet its obligations the Fund could sustain significant losses. Credit default swaps also are subject to the risk that the Fund will not properly assess the cost of the underlying investment. If the Fund is selling credit protection, it bears the risk that a credit event will occur, requiring the Fund to pay the counterparty the set value of the defaulted bonds. If the Fund is buying credit protection, there is the risk that no credit event will occur and the Fund will receive no benefit for the premium paid.

Country or sector risk– if the Fund emphasizes one or more countries or economic sectors, it will be more susceptible to the financial, market or economic events affecting the particular issuers in which it invests than funds that do not emphasize particular countries or sectors.

Liquidity risk – when there is little or no active trading market for specific types of securities or instruments, it can become more difficult to sell the securities or instruments at or near their perceived value. An inability to sell a portfolio position can adversely affect the Fund's value or prevent the Fund from being able to take advantage of other investment opportunities. Liquidity risk also includes the risk that the Fund will experience significant net redemptions of its shares at a time when it cannot find willing buyers for its portfolio securities or instruments or can sell its portfolio securities or instruments only at a material loss. To meet redemption requests, the Fund may be forced to sell other securities or instruments that are more liquid, but at unfavorable times and conditions. Investments in foreign securities tend to have more exposure to liquidity risk than domestic securities.

Foreign securities risk – foreign securities often are more volatile, harder to price and less liquid than U.S. securities. The prices of foreign securities may be further affected by other factors, such as changes in the exchange rates between the U.S. dollar and the currencies in which the securities are traded.

Foreign currencies – foreign securities may be denominated or quoted in currencies other than the U.S. dollar. Changes in foreign currency exchange rates affect the value of the Fund’s portfolio. Generally, when the U.S. dollar rises in value against a foreign currency, a security denominated in that currency loses value because the currency is worth fewer U.S. dollars. Conversely, when the U.S. dollar decreases in value against a foreign currency, a security denominated in that currency gains value because the currency is worth more U.S. dollars.

Emerging markets risk – emerging markets are riskier than more developed markets because they tend to develop unevenly and may never fully develop. Investments in

Summary Prospectus August 26, 2026

Nationwide Strategic Income Fund

emerging markets are considered speculative. Emerging markets are more likely to experience hyperinflation and currency devaluations, which adversely affect returns to U.S. investors. In addition, many emerging securities markets have far lower trading volumes and less liquidity than developed markets. Since these markets are smaller than developed markets, they may be more likely to suffer sharp and frequent price changes or long-term price depression because of adverse publicity, investor perceptions or the actions of a few large investors. Practices in relation to settlement of securities transactions in emerging markets involve higher risks than those in developed markets, in part because the Fund will need to use brokers and counterparties that are less well capitalized, and custody and registration of assets in some countries are unreliable compared to developed markets. Companies in emerging market countries generally are subject to less stringent financial reporting, accounting and auditing standards than companies in more developed countries. In addition, information about such companies may be less available and reliable. Many emerging markets also have histories of political instability and abrupt changes in policies, and the ability to bring and enforce actions may be limited. Certain emerging markets also face other significant internal or external risks, including the risk of war, nationalization of assets, unexpected market closures and ethnic, religious and racial conflicts.

Selection risk – the risk that the securities selected by the Fund’s subadviser will underperform the markets, the relevant indexes or the securities selected by other funds with similar investment objectives and investment strategies.

Sovereign debt risk – sovereign debt instruments are subject to the risk that a governmental entity will delay or refuse to pay interest or repay principal on its sovereign debt due, for example, to cash flow problems, insufficient foreign currency reserves, political considerations, the relative size of the governmental entity’s debt position in relation to the economy or the failure to put in place economic reforms required by the International Monetary Fund or other multilateral agencies.

Portfolio turnover risk – a higher portfolio turnover rate increases transaction costs, may adversely impact the Fund’s performance, and may result in higher taxes when Fund shares are held in a taxable account.

Redemptions risk – the Fund is an investment option for other mutual funds that are managed as “funds-of-funds.” As a result, from time to time, the Fund may experience relatively large redemptions or investments. Large or continuous redemptions may increase the Fund’s transaction costs and could cause the Fund’s operating expenses to be allocated over a smaller asset base, leading to an increase in the Fund’s expense ratio. If funds-of-funds or other large shareholders redeem large amounts of shares rapidly or unexpectedly, the Fund may have to sell portfolio securities at times when it would not otherwise do so, which could negatively impact the Fund’s net asset value and liquidity.

U.S. government securities risk – not all obligations of the U.S. government, its agencies and instrumentalities are backed by the full faith and credit of the United States. Some obligations are backed only by the credit of the issuing agency or instrumentality, and in some cases there is some risk of default by the issuer. Even if a security is backed by the U.S. Treasury or the full faith and credit of the United States, such guarantee applies only to the timely payment of interest and principal. Neither the U.S. government nor its agencies guarantee the market value of their securities, and interest rate changes, prepayments and other factors will affect the value of U.S. government securities. It is possible that issuers of U.S. government securities will not have the funds to meet their payment obligations in the future.

Loss of money is a risk of investing in the Fund. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Performance

The following bar chart and table can help you evaluate the Fund’s potential risks. The bar chart shows how the Fund’s annual total returns have varied from year to year. The table compares the Fund’s average annual total returns to the returns of a broad-based securities market index. Remember, however, that past performance (before and after taxes) is not necessarily indicative of how the Fund will perform in the future. Updated performance information is available at no cost by visiting nationwide.com/mutualfunds or by calling 800-848-0920.

Annual Total Returns– Institutional Service Class Shares
(Years Ended December 31,)

Highest Quarter:	16.16%	–	Q2 2020
Lowest Quarter:	-18.18%	–	Q1 2020

Year-to-date total return:

2.37%

–

June 30, 2026

After-tax returns are shown in the table for Institutional Service Class shares only and will vary for other classes. After-tax returns are calculated using the historical highest individual

Summary Prospectus August 26, 2026

Nationwide Strategic Income Fund

federal marginal income tax rates and do not reflect state and local taxes. Your actual after-tax return depends on your personal tax situation and may differ from what is shown here. After-tax returns are not relevant to investors in tax-advantaged arrangements, such as individual retirement accounts, 401(k) plans or certain other employer-sponsored retirement plans.

Average Annual Total Returns
(For the Periods Ended December 31, 2025)

	1 Year	5 Years	10 Years
Class A Shares– Before Taxes	4.56%	5.00%	5.96%
Class R6 Shares– Before Taxes	7.48%	5.89%	6.56%
Institutional Service Class Shares– Before Taxes	7.36%	5.76%	6.48%
Institutional Service Class Shares– After Taxes on Distributions	5.10%	3.33%	3.98%
Institutional Service Class Shares– After Taxes on Distributions and Sales of Shares	4.32%	3.35%	3.90%
Bloomberg U.S. Aggregate Bond Index (The Index does not pay sales charges, fees, expenses or taxes.)	7.30%	-0.36%	2.01%

Portfolio Management

Investment Adviser

Nationwide Fund Advisors

Subadviser

Victory Capital Management Inc. (“Victory Capital”)

Portfolio Managers

Portfolio Manager	Title	Length of Service with Fund
Jonathan M. Duensing, CFA	Senior Managing Director, Director of Fixed Income, and Portfolio Manager	Since 2015
Jeffrey C. Galloway, CFA	Senior Vice President, Portfolio Manager, and Senior Credit Analyst	Since 2023

Purchase and Sale of Fund Shares

Minimum Initial Investment

Class A: $2,000

Class R6: $1,000,000

Institutional Service Class: $50,000

Automatic Asset Accumulation Plan (Class A): $0*

* Provided each monthly purchase is at least $50

Minimum Additional Investment

Class A: $100

Class R6, Institutional Service Class: no minimum

Automatic Asset Accumulation Plan (Class A): $50

In general, you can buy or sell (redeem) shares of the Fund through your broker-dealer or financial intermediary, or by mail or phone on any business day. You can generally pay for shares by check or wire.

To Purchase and Sell (Redeem) Fund Shares
Mail: Nationwide Funds c/o U.S. Bank Global Fund Services P.O. Box 219336 Kansas City, MO 64121-9336	Overnight: Nationwide Funds c/o U.S. Bank Global Fund Services 801 Pennsylvania Ave., Suite 219336 Kansas City, MO 64105-1307	Website: nationwide.com/ mutualfunds
Phone: 800-848-0920 (toll free). Representatives are available 9 a.m. – 8 p.m. Eastern time, Monday through Friday.

Tax Information

The Fund’s distributions are taxable, and generally will be taxed as ordinary income, capital gains, or some combination of both, unless you are investing through a tax-advantaged arrangement, such as a 401(k) plan or an individual retirement account, in which case your distributions may be taxed as ordinary income when withdrawn from the tax-advantaged account.

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 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.

Summary Prospectus August 26, 2026

Nationwide Strategic Income Fund