Certification Pursuant to Rule 30a-2(b) under the 1940 Act and Section 906 of the Sarbanes-Oxley Act 

  

I, Stephen T. Weber, President of Driehaus Mutual Funds (the “Registrant”), certify that: 

  

     

  

1. 

The Form N-CSR of the Registrant (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and 

  

     

  

2. 

The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant. 

  

         

Date: 

August 31, 2026 

  

/s/ Stephen T. Weber 

  

  

  

  

Stephen T. Weber, President 

  

  

  

  

(principal executive officer) 

  

  

  

  

I, Robert M. Kurinsky, Vice President and Treasurer of Driehaus Mutual Funds (the “Registrant”), certify that: 

  

     

  

1. 

The Form N-CSR of the Registrant (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and 

  

     

  

2. 

The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant. 

  

         

Date: 

August 31, 2026 

  

/s/ Robert M. Kurinsky 

  

  

  

  

Robert M. Kurinsky, Vice President and Treasurer 

  

  

  

  

(principal financial officer)