# EDGAR Filing Document

**Accession Number:** 0000822632
**File Stem:** 0001193125-26-039123
**Filing Date:** 2026-2
**Character Count:** 2726
**Document Hash:** 6aac44378c2a75e61c84ead54ec51da7
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-039123.hdr.sgml**: 20260205

**ACCESSION NUMBER**: 0001193125-26-039123

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260205

**DATE AS OF CHANGE**: 20260205

**EFFECTIVENESS DATE**: 20260205

**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:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 033-17463
- **FILM NUMBER:** 26602328

**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 Global Leaders Fund (Series ID: S000019315)

---

|  |  |  |
|:---|:---|:---|
| Class Name | Ticker Symbol | Class ID   |
| Class N    | WGGNX         | C000053607 |
| Class I    | WGFIX         | C000053608 |
| Class R6   | BGGIX         | C000053609 |

---

## Series and Classes Contracts Data

### William Blair Global Leaders Fund (Series ID: S000019315)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000053607 | Class N      | WGGNX           |
| C000053608 | Class I      | WGFIX           |
| C000053609 | Class R6     | BGGIX           |

**WILLIAM BLAIR FUNDS** 

**William Blair Global Leaders Fund** 

**(the "Fund")** 

Supplement dated February 5, 2026 to the Fund's Summary Prospectus dated May 1, 2025

and the Prospectus dated May 1, 2025, as supplemented

Effective immediately:

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

**Portfolio Managers.** Hugo Scott-Gall, a Partner of the Adviser, and Chandan Khanna, an Associate of the Adviser, co-manage the Fund. Mr. Scott-Gall has co-managed the Fund since 2021. Mr. Khanna has co-managed the Fund since 2025.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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.