Summary Prospectus by Investment Company (Form 497K)

SUMMARY PROSPECTUS February 28, 2026

RIVER OAK DISCOVERY FUND Ticker: RIVSX

Before you invest, you may want to review the Fund's Statutory Prospectus, which contains more information about the Fund and its risks. You can find the Fund's Prospectus, reports to shareholders, and other information about the Fund online at www.oakfunds.com/forms-information. You can also get this information at no cost by calling 1-888-462-5386, by sending an e-mail request to [email protected], or by asking any financial intermediary that offers shares of the Fund. The Fund's Prospectus and Statement of Additional Information, both dated February 28, 2026 are incorporated by reference to this Summary Prospectus and may be obtained, free of charge, at the website, phone number or e-mail address noted above.

INVESTMENT GOAL

The Fund seeks long-term capital growth.

FUND 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.

ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)	Class I
Management Fees	0.74%
Other Expenses	0.49%
Total Annual Fund Operating Expenses	1.23%

Example

This Example is intended to help you compare the cost of investing in the Fund's Class I shares with the cost of investing in other mutual funds.

The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year, that the Fund's operating expenses remain the same, and that you reinvest all dividends and distributions.

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
	$125	$390	$676	$1,489

Summary Prospectus | February 28, 2026

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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 9% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGY OF THE FUND

The Fund invests primarily in common stocks of U.S. companies with small market capitalization, or small cap companies. In selecting investments for the Fund, the Adviser chooses stocks of companies which it believes have above-average growth potential at attractive prices. The Fund will generally hold between 30 and 40 common stocks. The Adviser considers small cap companies to be those with market capitalizations at the time of purchase below $15 billion or those with market capitalizations similar in size or range to the performance benchmark index at the time of purchase.

The Adviser utilizes a combined approach of "top-down" analysis and "bottom-up" stock selection. The "top-down" approach takes into consideration such factors as long-term economic, demographic and geopolitical themes. These include such macroeconomic factors as interest rates, inflation, the regulatory environment and the global competitive landscape. As a result of the "top-down" analysis, the Adviser identifies sectors, industries and companies which it believes should benefit from the overall themes that the Adviser has observed. As part of its "bottom-up" stock selection, the Adviser then looks for individual companies with earnings growth potential that should exceed the earnings growth rate of the overall market over the long-term, and that may not be fully recognized by the market at large. In determining whether a particular company is suitable for investment, the Adviser focuses on a number of different attributes including the company's specific market expertise or dominance, its competitive durability and pricing power, solid fundamentals, strong and ethical management, apparent commitment to shareholder interests and reasonable valuations in the context of projected growth rates. The Adviser's investment strategy often involves overweighting the Fund's position in the sectors and industries which it believes hold the most growth potential relative to the weightings such sectors and industries represent in the Fund's benchmark. The Fund invests primarily in common stocks of U.S. companies, but may, to a lesser extent, invest in equity REITs, common stocks of foreign companies and American Depositary Receipts ("ADRs"). The Adviser may sell a security if the reason for its original purchase changes or when it believes better opportunities are available among similar companies.

2	1-888-462-5386 | www.oakfunds.com

PRINCIPAL RISKS OF INVESTING IN THE FUND

The Fund's share price will fluctuate. You could lose money on your investment in the Fund and the Fund could also return less than other investments. The Fund is subject to the principal risks summarized below. The order of the below risk factors does not indicate the significance of any particular risk factor and the relative significance of each risk below may change over time.

Equity Securities Risk: The Fund is subject to the risk that stock prices will fall over short or extended periods of time. Individual companies may report poor results or be negatively affected by industry and/or economic trends and developments. The prices of securities issued by these companies may decline in response to such developments, which could result in a decline in the value of the Fund's shares.

Foreign Securities Risk: The Fund is subject to the risk that investing in securities of foreign (non-U.S.) companies may result in the Fund experiencing more rapid and extreme changes in value than a fund that invests exclusively in securities of U.S. companies, due to less liquid markets and adverse economic, political, diplomatic, financial, and regulatory factors. Foreign governments also may impose limits on investment and repatriation and impose taxes. Any of these events could cause the value of the Fund's investments to decline. ADRs are securities that evidence ownership interests in a security or a pool of securities issued by a foreign issuer. The risks of ADRs include many risks associated with investing directly in foreign securities, such as individual country risk and liquidity risk.

Growth Investing Risk: The Fund is subject to the risk that the Adviser's bias towards a growth-oriented style of investing may underperform other investment styles or the equity markets as a whole. A principal risk of growth investing is that prices of growth stocks may be more sensitive to changes in current or expected earnings than the prices of other stocks.

Industrials Sector Risk: The industrials sector can be significantly affected by, among other things, worldwide economic growth, supply and demand for specific products and services, rapid technological developments, and government regulation.

Investment Focus Risk: The Fund will not concentrate its investments (i.e., invest more than 25% of the value of its total assets) in securities of issuers in any industry or group of industries. Although the Fund is diversified, the Fund may invest more heavily in sectors and industries which it believes hold the most growth potential. As of the date of this Prospectus, the Fund currently invests a significant portion of its assets in the technology and industrials sectors. Poor performance or adverse economic events affecting one or more of an overweighted sector or industry could have a greater impact on the Fund than it would on another mutual fund with a broader range of investments.

Summary Prospectus | February 28, 2026

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Management Risk: Management risk is the risk that a strategy used by the Adviser may fail to produce the intended results.

Market Risk: Market risk is the risk that the market value of a security may fluctuate, sometimes rapidly and unpredictably.

Mid Cap Risk: Mid cap risk is the risk that stocks of mid-sized companies may be subject to more abrupt or erratic market movements than stocks of larger, more established companies. Mid-sized companies may have limited product lines or financial resources and may be dependent upon a particular niche of the market.

REITs Risk: REITs must satisfy specific requirements for favorable tax treatment and can involve unique risks in addition to the risks generally affecting the real estate industry. REITs are dependent upon the quality of their management, may have limited financial resources and heavy cash flow dependency, and may not be diversified geographically or by property type.

Small Cap Risk: Small cap companies may be more vulnerable than large cap and mid cap companies to adverse business or economic developments. Securities of such companies may be less liquid and more volatile than securities of larger companies and therefore may involve greater risk.

Technology Sector Risk: As of its most recently completed fiscal year, the Fund held investments in the technology sector that represented a material portion of the Fund's asset value. Technology companies face competition and potentially rapid product obsolescence. They are also heavily dependent on intellectual property rights and may be adversely affected by the loss or impairment of those rights. Companies in the information technology sector are facing increased government and regulatory scrutiny and may be subject to adverse government or regulatory action. Companies in the software industry may be adversely affected by, among other things, the decline or fluctuation of subscription renewal rates for their products and services and actual or perceived vulnerabilities in their products or services.

PERFORMANCE INFORMATION

The bar chart and the performance table below illustrate the risks and volatility of an investment in the Fund's Class I shares. Of course, the Fund's past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future. Updated performance information is available at www.oakfunds.com or by calling 1-888-462-5386.

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The bar chart shows changes in the Fund's performance from calendar year to calendar year.

BEST QUARTER	WORST QUARTER
37.50%	(29.25)%
12/31/2020	3/31/2020

AVERAGE ANNUAL TOTAL RETURNS

This table compares the Fund's Class I shares average annual total returns for the periods ended December 31, 2025. The following information is intended to help you understand the risks and volatility of investing in the Fund by showing: (a) changes in the performance of the Fund's Class I shares from year to year; and (b) how the average annual total return of the Fund's Class I shares compare to those of a regulatorily required broad-based securities market index (S&P Composite 1500) (the "Regulatory Benchmark") and the S&P SmallCap 600 Index (the "Performance Benchmark"). The Performance Benchmark is generally more representative of the market sectors and/or types of investments in which the Fund invests or to which the Fund has exposure and which the Adviser uses to measure the Fund's performance. The Fund has included in the table the performance of the Regulatory Benchmark, which represents a broader measure of market performance, to comply with regulatory requirements.

	1 Year	5 Years	10 Years
Class I Returns Before Taxes	9.11%	5.56%	9.29%
Returns After Taxes on Distributions*	9.04%	4.75%	7.94%
Returns After Taxes on Distributions and Sale of Fund Shares*	5.45%	4.26%	7.29%
S&P SmallCap 600 (reflects no deduction for fees, expenses or taxes)	6.02%	7.31%	9.81%
S&P Composite 1500 (reflects no deduction for fees, expenses or taxes)	17.02%	13.96%	14.46%

*

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. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.

Summary Prospectus | February 28, 2026

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INVESTMENT ADVISER

Oak Associates, ltd.

PORTFOLIO MANAGERS

Robert D. Stimpson, CIO, CFA, CMT

Portfolio Manager of the Fund since 2005.

Jeffrey B. Travis, CFA

Portfolio Manager of the Fund since 2019.

PURCHASE AND SALE OF FUND SHARES

The minimum initial investment in the Fund is $2,000 (or $1,000 with an Automatic Investment Plan). Each additional investment must be at least $25. You may purchase and sell shares in the Fund on a day when the New York Stock Exchange is open for business. Shares of the Fund may be purchased or redeemed directly through Oak Associates Funds or through your financial intermediary. For more information about buying and selling shares, refer to the section "Purchasing, Selling and Exchanging Fund Shares" on page 40 of the Fund's Prospectus or call 1-888-462-5386.

TAX INFORMATION

The Fund intends to make distributions that may be taxed as ordinary income or capital gains, except when shares are held through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account. For more information on distributions from the Fund, refer to the sections "Dividends and Distributions" and "Taxation of the Funds" on page 53 of the Fund's Prospectus.

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/or Adviser may pay the financial 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 financial intermediary and your salesperson to recommend the Fund over another investment. Ask your salesperson or visit your financial intermediary's website for more information.

6	1-888-462-5386 | www.oakfunds.com