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Filed Pursuant to Rule 497(e)

1933 Act File No. 033-20827

1940 Act File No. 811-05518

The RBB Fund, Inc.

Boston Partners Small Cap Value Fund II

Boston Partners Emerging Markets Long/Short Fund

Boston Partners Emerging Markets Fund

( collectively, the “Funds”)

June 8, 2020

EXPLANATORY NOTE

On behalf of the Funds, each a series of The RBB Fund, Inc. (the “Company”), and pursuant to Rule 497(e) under the Securities Act of 1933, as amended (the “Securities Act”), the purpose of this filing is to submit an interactive data file in the manner provided by Rule 405 of Regulation S-T and General Instruction C.3.(g) of Form N-1A. The interactive data file included as an exhibit to this filing relates to the Supplement filed with the Securities and Exchange Commission on behalf of the Company pursuant to Rule 497(e) under the Securities Act on June 1, 2020; such form of Supplement (Accession Number 0000930413-20-001522) is incorporated by reference into this Rule 497 Document.

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