Form 485BXT WILLIAM BLAIR FUNDS
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E-mailAs filed with the Securities and Exchange Commission on or about January 26, 2026
Registration No. 033-17463 and 811-05344
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM N-1A
REGISTRATION STATEMENT
UNDER
| THE SECURITIES ACT OF 1933 | ☒ | |||
| Pre-Effective Amendment No. | ☐ | |||
| Post-Effective Amendment No. 157 | ☒ |
and
REGISTRATION STATEMENT
UNDER
| THE INVESTMENT COMPANY ACT OF 1940 | ☒ | |||
| Amendment No. 158 | ☒ |
WILLIAM BLAIR FUNDS
(Exact Name of Registrant as Specified in Charter)
150 North Riverside Plaza Chicago, Illinois 60606
(Address of Principal Executive Offices, including Zip Code)
Registrant’s Telephone Number, Including Area Code: (312) 364-8000
| (Name and Address of Agent for Service)
Lisa Rusch William Blair Investment Management, LLC 150 North Riverside Plaza Chicago, Illinois 60606 |
Copy to:
Allison M. Fumai, Esq. Stephanie A. Capistron, Esq. Dechert LLP One International Place, 40th Floor 100 Oliver Street Boston, Massachusetts 02110 | |
It is proposed that this filing will become effective (check appropriate box)
| ☐ | immediately upon filing pursuant to paragraph (b) |
| ☒ | on February 26, 2026, pursuant to paragraph (b) |
| ☐ | 60 days after filing pursuant to paragraph (a)(1) |
| ☐ | on , pursuant to paragraph (a)(1) |
| ☐ | 75 days after filing pursuant to paragraph (a)(2) |
| ☐ | on , pursuant to paragraph (a)(2) of Rule 485. |
If appropriate, check the following box:
| ☒ | this post-effective amendment designates a new effective date for a previously filed post-effective amendment. |
Approximate Date of Proposed Public Offering: As soon as practicable after the effective date of the registration statement
EXPLANATORY NOTE
The purpose of this filing is to delay the effectiveness of the Registrant’s Post-Effective Amendment No. 156 to its Registration Statement until February 26, 2026. Parts A, B, and C of Registrant’s Post-Effective Amendment No. 156 under the Securities Act of 1933 and No. 157 under the Investment Company Act of 1940, filed on November 28, 2025, are incorporated by reference herein.
SIGNATURES
Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant certifies that it meets all of the requirements for effectiveness of this registration statement under Rule 485(b) under the Securities Act of 1933 and that it has duly caused this Post-Effective Amendment No. 157 to the registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Chicago, and State of Illinois, on the 26th day of January, 2026.
| WILLIAM BLAIR FUNDS | ||
| By: | /s/ Lisa Rusch | |
| Lisa Rusch, President | ||
Pursuant to the requirements of the Securities Act of 1933, this Post-Effective Amendment No. 157 to the registration statement has been signed below by the following persons in the capacity indicated on the 26th day of January, 2026.
| Signature |
Title | |||
| /s/ Cissie Citardi* Cissie Citardi |
Trustee | |||
| /s/ Vann A. Avedisian* Vann A. Avedisian |
Trustee | |||
| /s/ Kathleen T. Barr* Kathleen T. Barr |
Trustee | |||
| /s/ Michelle E. Borré Massick* Michelle E. Borré Massick |
Trustee | |||
| /s/ Daniel N. Leib* Daniel N. Leib |
Trustee | |||
| /s/ Dorri C. McWhorter* Dorri C. McWhorter |
Trustee | |||
| /s/ Steven R. Zenz* Steven R. Zenz |
Trustee | |||
| /s/ John M. Raczek John M. Raczek |
Treasurer (Principal Financial Officer, Principal Accounting Officer) | |||
| *By: |
/s/ Lisa Rusch | |
| Lisa Rusch, Attorney-in-Fact | ||
* Lisa Rusch signs this document pursuant to powers of attorney filed as an exhibit to Post-Effective Amendment No. 156.
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