Driehaus Mutual Funds

05/01/2026 | Press release | Distributed by Public on 05/01/2026 11:39

Prospectus Certification by Investment Company (Form 497J)

Vedder Price

222 North LaSalle Street

Chicago, Illinois 60601

T: +1 312 609 7500

F: +1 312 609 5005

vedder.com

Renee M. Hardt

Shareholder

+1 312 609 7616

[email protected]

May 1, 2026

VIA EDGAR

Securities and Exchange Commission
100 F. Street, NE
Washington, D.C. 20546

Re: Driehaus Mutual Funds ("Registrant")
Registration Nos. 333-05265 and 811-07655

To the Commission:

Pursuant to Rule 497(j) of Regulation C, under the Securities Act of 1933, in lieu of filing under paragraph (b) or (c) of Rule 497, on behalf of the Registrant, we hereby certify that (1) the forms of Prospectus and Statement of Additional Information, each dated April 30, 2026, as filed on April 29, 2026 for the above-captioned Registrant that would have been filed under paragraph (b) or (c) of Rule 497 do not differ from that contained in the most recent registration statement or amendment and (2) the text of the most recent registration statement or amendment has been filed electronically.

Very truly yours,

/s/ Renee M. Hardt

Renee M. Hardt

Vedder Price P.C. is affiliated with Vedder Price LLP, which operates in England and Wales, Vedder Price (CA), LLP, which operates in California,
Vedder Price Pte. Ltd., which operates in Singapore, and Vedder Price (FL) LLP, which operates in Florida.

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Driehaus Mutual Funds published this content on May 01, 2026, and is solely responsible for the information contained herein. Distributed via EDGAR on May 01, 2026 at 17:39 UTC. If you believe the information included in the content is inaccurate or outdated and requires editing or removal, please contact us at [email protected]