West Fraser (WFG) updates investors on OSB capacity reduction via Form 6-K

Rhea-AI Filing Summary

West Fraser Timber Co. Ltd., a foreign private issuer, furnished a Form 6-K for December 2025 that attaches a news release dated December 4, 2025 titled “West Fraser Reduces OSB Capacity.” The filing signals that the company is formally informing investors about a reduction in its oriented strand board (OSB) production capacity through this news release.

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 December 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): ☐

EXHIBIT INDEX

Exhibit		Description
99.1		News release dated December 4, 2025 re: West Fraser Reduces OSB Capacity

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: December 4, 2025

WEST FRASER TIMBER CO. LTD.

/s/ Christopher A. Virostek

Christopher A. Virostek

Executive Vice-President and Chief Financial Officer

FAQ

What did West Fraser Timber Co. Ltd. (WFG) report in its December 2025 Form 6-K?

West Fraser’s December 2025 Form 6-K furnishes a news release titled “West Fraser Reduces OSB Capacity.” The filing formally provides this release to investors under U.S. securities law reporting requirements.

What is the main topic of West Fraser Timber (WFG) December 4, 2025 news release?

The December 4, 2025 news release attached to the Form 6-K is titled “West Fraser Reduces OSB Capacity.” It focuses on a reduction in the company’s oriented strand board production capacity.

Which SEC form did West Fraser Timber (WFG) use to share its OSB capacity update?

West Fraser used a Form 6-K, the standard report for foreign private issuers, to share its December 4, 2025 news release about reducing OSB capacity with U.S. investors.

Who signed West Fraser Timber’s (WFG) December 2025 Form 6-K?

The Form 6-K is signed by Christopher A. Virostek, who is identified as Executive Vice-President and Chief Financial Officer of West Fraser Timber Co. Ltd., dated December 4, 2025.

What exhibit is included in West Fraser Timber’s (WFG) December 2025 Form 6-K?

The Form 6-K includes Exhibit 99.1, described as a news release dated December 4, 2025 titled “West Fraser Reduces OSB Capacity,” which is provided as part of the filing.