Document

Pursuant to Rule 497(j) under the Securities Act of 1933 (the “1933 Act”), as amended, on behalf of the Registrant, we hereby certify that (1) the form of Prospectus and Statement of Additional Information, dated May 1, 2024 for RMB Fund, RMB Mendon Financial Services Fund, RMB International Fund, RMB Japan Fund, RMB Small Cap Fund and RMB SMID Cap Fund (the "Funds"), each a series of the above-captioned Registrant, that would have been filed under paragraph (b) or (c) of Rule 497 does not differ from the Prospectus and Statement of Additional Information dated May 1, 2024 for the Funds contained in the most recent amendment to the Registrant's registration statement and (2) the text of the Prospectus and Statement of Additional Information dated May 1, 2024 has been filed electronically as Post-Effective Amendment No. 127 to the Funds’ Registration Statement on Form N-1A on April 29, 2024.