# EDGAR Filing Document

**Accession Number:** 0000822632
**File Stem:** 0001193125-26-289313
**Filing Date:** 2026-6
**Character Count:** 3037
**Document Hash:** 7fa434a0c324780d33faec2791582d47
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-289313.hdr.sgml**: 20260630

**ACCESSION NUMBER**: 0001193125-26-289313

**CONFORMED SUBMISSION TYPE**: 497K

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260630

**DATE AS OF CHANGE**: 20260630

**EFFECTIVENESS DATE**: 20260630

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** WILLIAM BLAIR FUNDS
- **CENTRAL INDEX KEY:** 0000822632

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 497K
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 033-17463
- **FILM NUMBER:** 261137929

**BUSINESS ADDRESS:**
- **STREET 1:** 150 NORTH RIVERSIDE PLAZA
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60606
- **BUSINESS PHONE:** 3123648000

**MAIL ADDRESS:**
- **STREET 1:** 150 NORTH RIVERSIDE PLAZA
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60606

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** WILLIAM BLAIR MUTUAL FUNDS INC
- **DATE OF NAME CHANGE:** 19960112

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** BLAIR WILLIAM READY RESERVES INC
- **DATE OF NAME CHANGE:** 19920316

## Series and Classes Contracts Data

### William Blair Mid Cap Value Fund (Series ID: S000075391)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000234386 | Class I      | WVMIX           |
| C000234387 | Class R6     | WVMRX           |

**WILLIAM BLAIR FUNDS** 

**William Blair Mid Cap Value Fund** 

**William Blair Small-Mid Cap Value Fund** 

**William Blair Small Cap Value Fund** 

**(each a "Fund" and collectively, the "Funds")** 

Supplement dated June 30, 2026 to each Fund's Summary Prospectus

and the Funds' Prospectus, each dated May 1, 2026, as supplemented

Effective immediately:

1. The information below replaces similar disclosure in the respective "Management" section of each
Fund's Summary Prospectus and the "Summary – Management" section of the Prospectus as follows:

<u>For the William Blair Mid Cap Value Fund:</u>

**Portfolio Managers.** Matthew Fleming, a Partner of the Adviser, and Mark Goodman, an Associate of the Adviser, co-manage the Fund. Mr. Fleming has co-managed the Fund since its inception in 2022. Mr. Goodman has co-managed the Fund since 2025.

<u>For the William Blair Small-Mid Cap Value Fund:</u>

**Portfolio Managers.** Matthew Fleming, a Partner of the Adviser, and Mark Goodman, an Associate of the Adviser, co-manage the Fund. Mr. Fleming has co-managed the Fund since its inception in 2023. Mr. Goodman has co-managed the Fund since 2025.

<u>For the William Blair Small Cap Value Fund:</u>

**Portfolio Managers.** Matthew Fleming, a Partner of the Adviser, and Mark Goodman, an Associate of the Adviser, co-manage the Fund. Mr. Fleming has co-managed the Fund since 2024. Mr. Goodman has co-managed the Fund since 2025.

2. Corresponding changes are made in the Prospectus under "Management of the Funds – Portfolio
Management."

**WILLIAM BLAIR FUNDS** 

150 North Riverside Plaza

Chicago, Illinois 60606

Please retain this supplement for future reference.