Company: WFG
Filing Date: 2025-01-24
Form Type: 6-K
Source: 0001193125-25-011525
Chunk: 0

Company: WEST FRASER TIMBER CO., LTD
Filing Date: 2025-01-24
Form: 6-K
Chunk 0
---
### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of January 2025

Commission File No. 001-39974

WEST FRASER TIMBER CO. LTD.

(Translation of registrant’s name into English)

885 West Georgia Street, Suite 1500

Vancouver, British Columbia

Canada V6C 3E8

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F

Form 20-F ☐ Form
40-F ☒

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1) ☐

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7) ☐

SUBMITTED HEREWITH

-2-

SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. Dated: January 23, 2025

| WEST FRASER TIMBER CO. LTD.                                |
| /s/ Christopher A. Virostek                                |
| Christopher A. Virostek                                    |
| Senior Vice-President, Finance and Chief Financial Officer |