THE RBB FUND, INC.

F/m Investments Large Cap Focused Fund

(the “Fund”)

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Supplement dated May 20, 2025

to the Prospectus and Statement of Additional Information (“SAI”)

dated December 31, 2024

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Effective June 30, 2025, the mailing address for the Fund has changed. Going forward, please send written requests to obtain Fund documentation, or to purchase, redeem, or exchange shares of the Fund to:  

Regular Mail:

F/m Investments Large Cap Focused Fund 

c/o U.S. Bank Global Fund Services 

PO Box 219252 

Kansas City, MO 64121-9252 

Overnight Delivery: 

F/m Investments Large Cap Focused Fund 

c/o U.S. Bank Global Fund Services 

801 Pennsylvania Ave, Suite 219252 

Kansas City, MO 64105-1307 

If you have any questions, please call the Fund at 1-888-553-4233.

Investors should retain this supplement for future reference.