6-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OFFOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of December 2023

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 ExecutiveOffices)

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

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.

EX-99.1

Exhibit 99.1

For Immediate Release

WEST FRASER DECLARES DIVIDEND AND ANNOUNCES APPOINTMENT TO BOARD OF DIRECTORS

VANCOUVER, B.C., December 12, 2023 – West Fraser Timber Co. Ltd. (“West Fraser” or the “Company”) (TSX and NYSE: WFG) has declared a quarterly dividend of US$0.30 per share on the Common shares and Class B Common shares in the capital of the Company, payable on January 15, 2024 to shareholders of record on December 29, 2023.

Dividends are designated to be eligible dividends pursuant to subsection 89(14) of the Income Tax Act (Canada) and any applicable provincial legislation pertaining to eligible dividends.

Dividends are declared and payable in U.S. dollars. Shareholders may elect to receive their dividends in Canadian dollars. Details regarding the election procedure are available on our website at www.westfraser.com in the “Investors/Stock Information/Dividends” section.

Further, as previously announced, Sean McLaren will succeed Ray Ferris as President and Chief Executive Officer following Ray’s retirement at the end of the year. The Board of Directors has appointed Sean McLaren to join the Board of Directors effective January 1, 2024 in place of Ray Ferris.

About West Fraser

West Fraser is a diversified wood products company with more than 60 facilities in Canada, the United States, the United Kingdom, and Europe. From responsibly sourced and sustainably managed forest resources, the Company produces lumber, engineered wood products (OSB, LVL, MDF, plywood, and particleboard), pulp, newsprint, wood chips, other residuals, and renewable energy. West Fraser’s products are used in home construction, repair and remodelling, industrial applications, papers, tissue, and box materials.

For More Information

Investor Contact

Robert B. Winslow, CFA

Director, Investor Relations & Corporate Development

Tel. (416) 777-4426

shareholder@westfraser.com

Media Contact

Joyce Wagenaar

Director, Communications

Tel. (604) 817-5539

media@westfraser.com