The RBB Fund, Inc.

615 East Michigan Street

Milwaukee, Wisconsin 53202

October 31, 2023

VIA EDGAR TRANSMISSION

U.S. Securities and Exchange Commission

Department of Investment Management

100 F. Street, N.E.

Washington, D.C. 20549

Re:The RBB Fund, Inc. (the “Company”)

File Nos.: 033-20827 and 811-05518

F/m Investments Large Cap Focused Fund

(the “Fund”)

Dear Sir or Madam:

Pursuant to Rule 497(j) under the Securities Act of 1933, as amended, and pursuant to the Investment Company Act of 1940, as amended, and the regulations thereunder, the Company on behalf of the Fund hereby certifies that the forms of Prospectus and Statement of Additional Information that would have been filed under Rule 497(b) or (c) would not have differed from those contained in the most recent amendment for the Fund dated October 30, 2023, and filed electronically as Post-Effective Amendment No. 310 to the Company’s Registration Statement on Form N-1A.

If you have any questions or require further information, do not hesitate to contact the undersigned at edward.paz@usbank.com.

Sincerely,

/s/ Edward Paz    

Edward Paz

Assistant Secretary

cc:    Steven Plump, The RBB Fund, Inc.

James Shaw, The RBB Fund, Inc.

Jillian Bosmann, Faegre Drinker Biddle & Reath LLP