UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549


FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

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

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of October 2025

Commission File Number: 001-39974

WEST FRASER TIMBER CO. LTD.

(Exact name of Registrant, as specified in its charter)

1500 - 885 West Georgia Street

Vancouver, British Columbia

Canada, V6C 3E8

Tel: (604) 895-2700

(Address and Telephone Number of Registrant's Principal Executive Offices)

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): ☐

The information contained in Exhibits 99.1 and 99.2 of this Form 6-K is incorporated by reference into the Registrant’s registration statements on Form S-8: File Nos. 333-257254 and 333-252631.

EXHIBIT INDEX


Exhibit			Description
99.1			Unaudited Condensed Consolidated Financial Statements for the three and nine months ended September 26, 2025 and September 27, 2024
99.2			Management's Discussion and Analysis for the three and nine months ended September 26, 2025
99.3			CEO - Certification of Interim Filings
99.4			CFO - Certification of Interim Filings
99.5			News release dated October 22, 2025 re: West Fraser Announces Third Quarter 2025 Results

SIGNATURES

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.


Date: October 22, 2025
WEST FRASER TIMBER CO. LTD.
/s/ Christopher A. Virostek
Christopher A. Virostek Executive Vice-President and Chief Financial Officer

WEST FRASER TIMBER CO., LTD 6-K