497K - NVIT Columbia Overseas Value

NVIT Putnam International Value Fund

Summary Prospectus April 30, 2026

Class I / Class II / Class X / Class Y / Class Z

Before you invest, you may want to review the Fund’s Prospectus, which contains information about the Fund and its risks. This Summary Prospectus is intended for use in connection with variable insurance contracts, and is not intended for use by other investors. The Fund’s Prospectus and Statement of Additional Information, each dated April 30, 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/mutualfundsnvit, email a request to web_help@nationwide.com or call 800-848-0920, or ask any variable insurance contract provider who offers shares of the Fund as an underlying investment option in its products.

Objective

The NVIT Putnam International Value Fund seeks to maximize total return consisting of capital appreciation and/or 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. Sales charges and other expenses that may be imposed by variable insurance contracts are not included. If these charges were reflected, the expenses listed below would be higher. See the variable insurance contract prospectus, which may impose sales charges and other additional contract-level expenses.

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

	Class I Shares	Class II Shares	Class X Shares	Class Y Shares	Class Z Shares
Management Fees	0.73%	0.73%	0.73%	0.73%	0.73%
Distribution and/or Service (12b-1) Fees	None	0.25%	None	None	0.25%
Other Expenses	0.25%	0.25%	0.11%	0.10%	0.11%
Total Annual Fund Operating Expenses	0.98%	1.23%	0.84%	0.83%	1.09%
Fee Waiver/Expense Reimbursement(1)	(0.05)%	(0.05)%	(0.05)%	(0.05)%	(0.05)%
Total Annual Fund Operating Expenses After Fee Waiver/Expense Reimbursement	0.93%	1.18%	0.79%	0.78%	1.04%

(1) Nationwide Variable Insurance Trust (the “Trust”) and Nationwide Fund Advisors (the “Adviser”) have entered into a written contract limiting annual fund operating expenses to 0.78% until at

least April 30, 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 on 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 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. The Example, however, does not include charges that are imposed by variable insurance contracts. If these charges were reflected, the expenses listed below would be higher.

This 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

NSP-IV (4/26)

Summary Prospectus April 30, 2026

NVIT Putnam International Value Fund

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 I Shares	$95	$307	$537	$1,197
Class II Shares	120	385	671	1,484
Class X Shares	81	263	461	1,033
Class Y Shares	80	260	456	1,021
Class Z Shares	106	342	596	1,324

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. 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 107.86% of the average value of its portfolio.

Principal Investment Strategies

Under normal conditions, the Fund invests mainly in equity securities (i.e., common stocks) of large and midsize companies outside the United States. The subadviser considers a company to be located outside the United States if the company’s securities trade outside the United States, the company is headquartered or organized outside the United States or the company derives a majority of its revenues or profits outside the United States.

Typically, the Fund invests in developed countries, but may invest in emerging markets. Emerging markets countries typically are developing and low-or middle-income countries, and may be found in regions such as Asia, Latin America, Eastern Europe, the Middle East and Africa. Many of the securities in which the Fund invests are denominated in currencies other than the U.S. dollar. The Fund may have significant investments in one or more countries or in particular sectors.

The Fund focuses on investing in value stocks. Value stocks are those that the subadviser believes are currently undervalued by the market. If the subadviser is correct and other investors ultimately recognize the value of a company in which the Fund invests, the price of its stock may rise. When deciding whether to buy or sell investments, the subadviser may consider, among other factors, a company’s valuation, financial strength, growth potential, competitive position in its industry, projected future earnings, cash flows and dividends.

The Fund may engage in frequent and active trading of portfolio securities. The Fund may also use derivatives, such as certain foreign currency transactions, futures, options and swap contracts, for both hedging and non-hedging purposes. The subadviser will typically use foreign currency forward contracts in connection with the Fund’s investments in foreign securities in order to hedge the fund’s currency exposure relative to the MSCI EAFE Value Index.

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:

Equity securities risk – stock markets are volatile. The price of an equity security fluctuates based on changes in a company’s financial condition and overall market and economic conditions.

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 a 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.

Summary Prospectus April 30, 2026

NVIT Putnam International Value Fund

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 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.

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.

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. Derivatives also may be more difficult to purchase, sell or value than other instruments.

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.

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.

Options – purchasing and selling options are highly specialized activities and entail greater-than-ordinary investment risks. When options are purchased over the counter, the Fund bears the risk that the counterparty that wrote the option will be unable or unwilling to perform its obligations under the option contract. The Fund's ability to close out positions in exchange-listed options depends on the existence of a liquid market. Options that expire unexercised have no value.

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.

Swaps – using swaps can involve greater risks than if the Fund were to invest directly in the underlying securities or assets. Because swaps 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 swap contracts, and therefore they may be less liquid than exchange-traded instruments. If a swap counterparty fails to meet its obligations under the contract, the Fund will lose money.

Leverage risk – leverage risk is a direct risk of investing in the Fund. Leverage is investment exposure that exceeds the initial amount invested. Derivatives and other transactions that give rise to leverage may cause the Fund’s performance to be more volatile than if the Fund had not been leveraged. Leveraging also may require that the Fund liquidate portfolio securities when it may not be advantageous to do so to satisfy its obligations. Certain derivatives provide the potential for investment gain or loss that may be several times greater than the change in the value of an underlying security, asset, interest rate, index or currency, resulting in the potential for a loss that may be substantially greater than the amount invested. Some leveraged investments have the potential for unlimited loss, regardless of the size of the initial investment.

Value style risk – value investing carries the risk that the market will not recognize a security’s intrinsic value for a long time or that a stock judged to be undervalued actually is appropriately priced. In addition, value stocks as a group

Summary Prospectus April 30, 2026

NVIT Putnam International Value Fund

sometimes are out of favor and underperform the overall equity market for long periods while the market concentrates on other types of stocks, such as “growth” stocks.

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

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.

Smaller company risk – smaller companies are usually less stable in price and less liquid than larger, more established companies. Smaller companies are more vulnerable than larger companies to adverse business and economic developments and may have more limited resources. Therefore, they generally involve greater risk.

Portfolio turnover risk – a higher portfolio turnover rate increases transaction costs and may adversely impact the Fund’s performance.

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 provide some indication of the risks of investing in the Fund. The bar chart shows the volatility or variability of the Fund’s annual total returns over time and shows that Fund performance can change from year to year. The table shows the Fund’s average annual total returns for certain time periods compared to the returns of a broad-based securities market index and an additional index. The additional index has characteristics relevant to the Fund’s investment strategy. Remember, however, that past performance is not necessarily an indication of how the Fund will perform in the future. The returns shown in the bar chart and table do not include charges that will be imposed by variable insurance contracts. If these amounts were reflected, returns would be less than those shown.

The Fund compares its performance to the MSCI EAFE Index to satisfy a Securities and Exchange Commission (SEC) disclosure requirement.

The Fund's performance prior to February 3, 2025 reflects returns pursuant to different subadvisers than the Fund's current subadviser. If the Fund's current strategies and subadviser had been in place for the periods shown, the performance information would have been different.

Summary Prospectus April 30, 2026

NVIT Putnam International Value Fund

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

Highest Quarter:	19.29%	–	4Q 2020
Lowest Quarter:	-24.78%	–	1Q 2020

The Fund had not commenced offering Class II or Class Y shares as of the date of this Prospectus. Class X and Class Z shares commenced operations on October 12, 2020. Pre-inception historical performance for Class II, Class X, Class Y and Class Z shares is based on the previous performance of Class I shares. Performance for Class II and Class Z shares has been adjusted to reflect those share classes’ higher expenses than those of Class I shares. Performance for Class X and Class Y shares has not been adjusted to reflect those share classes’ lower expenses than those of Class I shares.

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

	1 Year	5 Years	10 Years
Class I Shares	34.99%	11.04%	7.65%
Class II Shares	34.65%	10.76%	7.38%
Class X Shares	35.21%	11.20%	7.72%
Class Y Shares	34.99%	11.04%	7.65%
Class Z Shares	34.95%	10.90%	7.52%
MSCI EAFE Index (reflects no deduction for fees or expenses)	31.22%	8.92%	8.18%
MSCI EAFE Value Index (reflects no deduction for fees or expenses)	42.25%	13.36%	8.69%

Portfolio Management

Investment Adviser

Nationwide Fund Advisors

Subadviser

Putnam Investment Management, LLC

Portfolio Managers

Portfolio Manager	Title	Length of Service with Fund
Darren A. Jaroch, CFA	Portfolio Manager	Since 2025
Lauren B. DeMore, CFA	Portfolio Manager	Since 2025

Tax Information

The dividends and distributions paid by the Fund to the insurance company separate accounts will consist of ordinary income, capital gains, or some combination of both. Because shares of the Fund must be purchased through separate accounts used to fund variable insurance contracts, such dividends and distributions will be exempt from current taxation by contract holders if left to accumulate within a separate account. Consult the variable insurance contract prospectus for additional tax information.

Payments to Broker-Dealers and Other Financial Intermediaries

This Fund is only offered as an underlying investment option for variable insurance contracts. The Fund and its related companies may make payments to the sponsoring insurance companies (or their affiliates) for distribution and/or other services, and to broker-dealers and other financial intermediaries that distribute the variable insurance contracts. These payments may create a conflict of interest by influencing the insurance companies to include the Fund as an underlying investment option in the variable insurance contracts, and by influencing the broker-dealers and other financial intermediaries to distribute variable insurance contracts that include the Fund as an underlying investment option over other variable insurance contracts or to otherwise recommend the selection of the Fund as an underlying investment option by contract owners instead of other funds that also may be available investment options. The prospectus (or other offering document) for your variable insurance contract may contain additional information about these payments.

Summary Prospectus April 30, 2026

NVIT Putnam International Value Fund