THE RBB FUND, INC.

Motley Fool Global Opportunities Fund (FOOLX and FOIIX)

Motley Fool Mid-Cap Growth Fund (TMFGX and FOGIX)

(collectively, the “Funds”)

Supplement Dated March 26, 2021 to the

Statement of Additional Information (“SAI”) dated December 31, 2020

The section entitled “Portfolio Holdings Information” is amended and restated in its entirety as shown below:

PORTFOLIO HOLDINGS INFORMATION

The Company has adopted, on behalf of the Funds, a policy relating to the selective disclosure of a Fund’s portfolio holdings by the Adviser, Board, officers, or third party service providers, in accordance with regulations that seek to ensure that disclosure of information about portfolio holdings is in the best interest of a Fund’s shareholders. The policies relating to the disclosure of a Fund’s portfolio holdings are designed to allow disclosure of portfolio holdings information where necessary to the Fund’s operation without compromising the integrity or performance of the Fund. It is the policy of the Company that disclosure of a Fund’s portfolio holdings to a select person or persons prior to the release of such holdings to the public (“selective disclosure”) is prohibited, unless there are legitimate business purposes for selective disclosure.

The Company discloses portfolio holdings information as required in regulatory filings and shareholder reports, discloses portfolio holdings information as required by federal and state securities laws and may disclose portfolio holdings information in response to requests by governmental authorities. As required by the federal securities laws, including the 1940 Act, the Company will disclose each Fund’s portfolio holdings in applicable regulatory filings, including shareholder reports, reports on Form N-CSR, Form N-CEN, and Form N-PORT, or such other filings, reports or disclosure documents as the applicable regulatory authorities may require.

Generally, between the 5th and 10th business day of the month following each calendar quarter end, each Fund may provide, at the Adviser’s discretion, its portfolio holdings to various rating and ranking organizations. In addition, generally between the 5th and 10th business day of the month following each calendar quarter end, each Fund may post to its website a list of its top ten holdings or full portfolio holdings at the discretion of the Adviser. The timing, frequency and type (i.e. ratings/rankings/holdings) of disclosure may change at the Adviser’s discretion, as well as whether to post to each Fund’s website.

The Company may distribute or authorize the distribution of information about a Fund’s portfolio holdings that is not publicly available to its third-party service providers, which include U.S. Bank, N.A., the custodian; U.S. Bancorp Fund Services, LLC, doing business as U.S. Bank Global Fund Services, LLC (“Fund Services”) the administrator, accounting agent and transfer agent; Tait, Weller & Baker LLP, the Funds’ independent registered public accounting firm; Faegre Drinker Biddle & Reath LLP, legal counsel; FilePoint, the financial printer; the Funds’ proxy voting service(s); and the Company’s liquidity classification agent. These service providers are required to keep such information confidential, and are prohibited from trading based on the information or otherwise using the information except as necessary in providing services to a Fund. Such holdings are released on conditions of confidentiality, which include appropriate trading prohibitions. “Conditions of confidentiality” include confidentiality terms included in written agreements, implied by the nature of the relationship (e.g. attorney-client relationship), or required by fiduciary or regulatory principles (e.g., custody services provided by financial institutions). Portfolio holdings may also be provided earlier to shareholders and their agents who receive redemptions in kind that reflect a pro rata allocation of all securities held in a Fund’s portfolio.

Portfolio holdings may also be disclosed, upon authorization by a designated officer of the Adviser, to (i) certain independent reporting agencies recognized by the SEC as acceptable agencies for the reporting of industry statistical information, and (ii) financial consultants to assist them in determining the suitability of a Fund as an investment for their clients, in each case in accordance with the anti-fraud provisions of the federal securities laws and the Company’s and Adviser’s fiduciary duties to Fund shareholders. Disclosures to financial consultants are also subject to a confidentiality agreement and/or trading restrictions. The foregoing disclosures are made pursuant to the Company’s policy on selective disclosure of portfolio holdings. The Board or a committee thereof may, in limited circumstances, permit other selective disclosure of portfolio holdings subject to a confidentiality agreement and/or trading restrictions.

The Adviser reserves the right to refuse to fulfill any request for portfolio holdings information from a shareholder or non-shareholder if it believes that providing such information will be contrary to the best interests of a Fund.

The Board provides ongoing oversight of the Company’s policies and procedures and compliance with such policies and procedures. As part of this oversight function, the Board receives from the Company’s Chief Compliance Officer (“CCO”) as necessary, reports on compliance with these policies and procedures. In addition, the Board receives an annual assessment of the adequacy and effectiveness of the policies and procedures with respect to a Fund, and any changes thereto, and an annual review of the operation of the policies and procedures. Any violation of the policy set forth above as well as any corrective action undertaken to address such violation must be reported by the Adviser, director, officer or third party service provider to the Company’s CCO, who will determine whether the violation should be reported immediately to the Board or at its next quarterly Board meeting.

TYPE OF SERVICE PROVIDER	TYPICAL FREQUENCY OF ACCESS TO PORTFOLIO INFORMATION	RESTRICTIONS
Adviser	Daily	Ethical
Administrator	Daily	Contractual and ethical
Underwriter	Daily	Contractual and ethical
Custodian	Daily	Contractual and ethical
Auditor	During annual audit	Ethical
Legal Counsel	Regulatory filings, Board meetings, and if a legal issue regarding the portfolio requires counsel’s review	Ethical
Printers	Quarterly—filing and printing of portfolio holdings schedules and semi-annual and annual reports	No formal restrictions in place. However, printer would not receive portfolio information until at least 30 days old.
Broker-Dealers Through Which the Fund Purchases and Sells Portfolio Securities	Daily access to the relevant purchase and/or sale—no broker/dealer has access to the Fund’s entire portfolio	Contractual and ethical

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Please keep this supplement for your reference.