WFG West Fraser Timber Co Ltd

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 August 2023

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: August 11, 2023

Senior Vice-President, Finance and Chief Financial Officer

Exhibit 99.1

Form 51–102F3

Material Change Report

West Fraser Timber Co. Ltd. (“West Fraser” or the “Company”)

885 West Georgia Street, Suite 1500

Vancouver, BC

V6C 3E8

August 9, 2023

A news release in respect of the material change was disseminated via Canada Newswire on August 10, 2023 prior to market open. The news release was also filed with each of the Canadian securities regulatory authorities on SEDAR and furnished to the US Securities Exchange Commission on EDGAR.

On August 10, 2023, West Fraser announced that Mr. Ray Ferris, President and Chief Executive Officer of West Fraser, plans to retire on December 31, 2023. West Fraser also announced the appointment of Mr. Sean McLaren, current Chief Operating Officer of West Fraser, as the new President and Chief Executive Officer of West Fraser effective January 1, 2024.

On August 10, 2023, Mr. Hank Ketcham, Chairman of West Fraser’s Board of Directors, announced that Mr. Ray Ferris, President and Chief Executive Officer of West Fraser, plans to retire on December 31, 2023. Mr. Ferris has been with West Fraser for over 26 years in increasingly senior positions culminating in his appointment as President and Chief Operating Officer in 2018 and as President and Chief Executive Officer and a director of the Company in 2019.

West Fraser also announced the appointment of Sean McLaren, current Chief Operating Officer of West Fraser, as the new President and Chief Executive Officer of West Fraser effective January 1, 2024. Mr. McLaren has been with West Fraser and predecessor companies for 35 years.

This material change report contains certain forward-looking information or forward-looking statements (collectively, “forward-looking statements”) within the meaning of applicable securities laws, including about potential future developments, in particular those relating to the announced retirement of Mr. Ferris, the transition plan and appointment of Mr. McLaren as President and Chief Executive Officer. Any such forward-looking statements are based on information currently available to us and are based on assumptions and analyses made by us considering West Fraser’s experience and perception of historical trends and current conditions and are subject to inherent risks and uncertainties, including fluctuations in demand for and pricing of our wood products, and risks associated with our capital plans. Readers should also refer to the risk factors set forth in the Company’s annual information form and management’s discussion and analysis for the year ended December 31, 2022, each dated February 14, 2023, as updated in the Company’s management’s discussion and analysis for the six months ended June 30, 2023, dated July 26, 2023, each available at SEDAR+ (www.sedarplus.ca) and EDGAR (www.sec.gov/edgar.shtml). There can be no assurance that the plans, intentions, or expectations upon which forward-looking statements are based will be realized. Actual results may differ, and the difference may be material and adverse to the Company and its shareholders. Readers should exercise caution in relying upon forward-looking statements and West Fraser undertakes no obligation to publicly revise them to reflect subsequent events or circumstances except as required by applicable securities laws.

Not applicable.

Not applicable.

None.

Christopher Virostek

Senior Vice-President, Finance and Chief Financial Officer

+1 (604) 895-2700

August 11, 2023