# EDGAR Filing Document

**Accession Number:** 0001016073
**File Stem:** 0001398344-26-001155
**Filing Date:** 2026-1
**Character Count:** 3512
**Document Hash:** 24cc6ce8da909fefcfa875a7f01d29ae
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001398344-26-001155.hdr.sgml**: 20260126

**ACCESSION NUMBER**: 0001398344-26-001155

**CONFORMED SUBMISSION TYPE**: 497K

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20260126

**DATE AS OF CHANGE**: 20260126

**EFFECTIVENESS DATE**: 20260126

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** DRIEHAUS MUTUAL FUNDS
- **CENTRAL INDEX KEY:** 0001016073

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 497K
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-05265
- **FILM NUMBER:** 26558619

**BUSINESS ADDRESS:**
- **STREET 1:** 25 EAST ERIE ST
- **STREET 2:** 25 EAST ERIE STREET
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60611
- **BUSINESS PHONE:** 3125873800

**MAIL ADDRESS:**
- **STREET 1:** 25 E. ERIE STREET
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60611

## Series and Classes Contracts Data

### Driehaus Event Driven Fund (Series ID: S000040177)

| Class ID   | Class Name                 | Ticker Symbol   |
|:---|:---|:---|
| C000124893 | Driehaus Event Driven Fund | DEVDX           |

![](fp0097301-1_01.jpg)

25 East Erie Street<br> Chicago, Illinois 60611<br> 1-800-560-6111

**Driehaus Event Driven Fund \*DEVDX<br>** 

<br> SUPPLEMENT DATED JANUARY 26, 2026

TO PROSPECTUS, SUMMARY PROSPECTUS AND

STATEMENT OF ADDITIONAL INFORMATION DATED APRIL 30, 2025

IMPORTANT NOTICE

The Board of Trustees of the Trust has determined to terminate and liquidate the Driehaus Event Driven Fund (the "Fund"). Shareholders who do not sell their shares of the Fund before the effective date under the Plan of Termination and Liquidation, currently expected to be March 27, 2026, will receive a liquidating distribution in cash equal to the amount of the net asset value of their shares. Thereafter, the Fund will be liquidated and dissolved, and all references to the Fund herein shall be removed.

Effective as of the close of business on February 2, 2026, the Fund is closed and will not accept any purchase orders. In connection with the termination of the Fund and as the Fund's investment adviser deems appropriate, the Fund will begin the process of liquidating its portfolio securities and shareholders should be aware that the Fund will not be pursuing its stated investment objective or engaging in any business activities except for the purpose of winding up its affairs.

If you hold your shares in an IRA or other tax-advantaged retirement account, you should consult your tax advisor regarding the rules for reinvesting your liquidation proceeds. You generally have 60 days from the date you receive your proceeds to reinvest your proceeds into another IRA or other qualified retirement account to avoid treatment of the redemption proceeds as taxable income for the current year. You or your financial advisor must notify the Fund prior to March 27, 2026 of your intent to reinvest your IRA or other tax-advantaged retirement account to avoid withholding deductions from your proceeds.

For taxable shareholders, the liquidating distribution will generally be treated as a redemption of shares and such shareholders may recognize a gain or loss for federal income tax purposes. Shareholders should consult with their tax advisors for information regarding all tax consequences applicable to investments in the Fund.

PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE

For more information, please call the Driehaus Mutual Funds at 1-800-560-6111.