Audit controls and fees detailed in West Fraser (NYSE: WFG) 40-F

Rhea-AI Filing Summary

West Fraser Timber Co. Ltd. filed its annual report on Form 40-F as a Canadian foreign private issuer for the year ended December 31, 2025. The company reports 78,299,822 common shares outstanding as of the period end and prepares its financial statements under IFRS Accounting Standards.

Management, under the CEO and CFO, concluded that disclosure controls and procedures and internal control over financial reporting were effective as of December 31, 2025, based on the COSO 2013 framework. PricewaterhouseCoopers LLP audited both the financial statements and the effectiveness of internal control over financial reporting.

Audit and related fees billed by PricewaterhouseCoopers LLP totaled $3,020 thousand in 2025 compared with $2,887 thousand in 2024. West Fraser reports no off-balance sheet arrangements that are material to investors, maintains an independent Audit Committee with an identified financial expert, and discloses a code of ethics and certain NYSE corporate governance differences, including a 25% shareholder meeting quorum requirement.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 40-F

o			REGISTRATION STATEMENT PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934
			OR
x			ANNUAL REPORT PURSUANT TO SECTION 13(a) OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2025 Commission File Number: 001-39974

WEST FRASER TIMBER CO. LTD.

(Exact name of Registrant as specified in its charter)

British Columbia, Canada

2421

98-1630330

(Province or Other Jurisdiction of Incorporation or Organization)

(Primary Standard Industrial Classification Code)

(I.R.S. Employer Identification No.)

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)

West Fraser, Inc.

57 Germantown Court, Suite 300

Cordova, TN 38018-4274

Tel: (901) 620-4200

(Name, address (including zip code) and telephone number (including

area code) of agent for service in the United States)

Securities registered or to be registered pursuant to section 12(b) of the Act:

Title Of Each Class			Trading Symbol(s)			Name Of Each Exchange On Which Registered
Common Shares, no par value			WFG			New York Stock Exchange

Securities registered or to be registered pursuant to Section 12(g) of the Act: None

Securities for which there is a reporting obligation pursuant to Section 15(d) of the Act: None

For annual reports, indicate by check mark the information filed with this Form:

x Annual Information Form x Audited Annual Financial Statements

Indicate the number of outstanding shares of each of the Registrant’s classes of capital or common stock as of the close of the period covered by the annual report: 78,299,822 Common Shares

Indicate by check mark whether the Registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Exchange Act during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

Yes x No o

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the Registrant was required to submit such files).

Yes x No o

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 12b-2 of the Exchange Act.

Emerging growth company o

If an emerging growth company that prepares its financial statements in accordance with U.S. GAAP, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

†The term "new or revised financial accounting standard" refers to any update issued by the Financial Accounting Standards Board to its Accounting Standards Codification after April 5, 2012.

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. x

If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statements. o

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b). o

INTRODUCTORY INFORMATION

West Fraser Timber Co. Ltd. (“West Fraser”) is a company amalgamated under the laws of British Columbia, Canada. West Fraser’s common shares were registered under Section 12(b) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), effective February 1, 2021. West Fraser is a Canadian issuer eligible to file its annual report pursuant to Section 13 of the Exchange Act on Form 40-F pursuant to the multi-jurisdictional disclosure system (the "MJDS") adopted by the United States Securities and Exchange Commission (the "SEC"). The equity securities of the Company are further exempt from Sections 14(a), 14(b), 14(c), 14(f) and 16 of the Exchange Act pursuant to Rule 3a12-3 of the Exchange Act. The common shares of West Fraser are traded in the United States on the New York Stock Exchange (“NYSE”) under the symbol "WFG".

In this annual report on Form 40-F (this "Annual Report"), references to "we", "our", "us", the "Company" or "West Fraser", mean West Fraser Timber Co. Ltd. and its consolidated subsidiaries, unless the context suggests otherwise.

Unless otherwise indicated, all amounts in this Annual Report are in United States dollars and all references to "$" mean United States dollars.

PRINCIPAL DOCUMENTS

The following documents have been filed as part of this Annual Report:

Document			Exhibit No.
Annual Information Form of the Company for the year ended December 31, 2025 (our "2025 AIF")			99.1
Audited consolidated financial statements of the Company and notes thereto as at December 31, 2025 and 2024 and for the years ended December 31, 2025 and 2024, together with the report of the Independent Registered Public Accounting Firm (our “2025 Audited Annual Financial Statements”) and Management's Report on Internal Control over Financial Reporting			99.2
Management’s Discussion and Analysis of the Company for the year ended December 31, 2025 (our "2025 Annual MD&A")			99.3

FORWARD-LOOKING STATEMENTS

This Annual Report and the exhibits attached hereto include certain statements that constitute "forward-looking statements" under the provisions of the U.S. Private Securities Litigation Reform Act of 1995, Section 21E under the Exchange Act, Section 27A of the U.S. Securities Act of 1933, as amended, and forward-looking information within the meaning of applicable Canadian securities legislation. Actual results or events could differ materially from those set forth in, or implied by, the forward-looking statements and the related assumptions due to a variety of factors. Investors are referred to the cautionary notes entitled “Forward-Looking Statements” that are included in each of our 2025 AIF and 2025 Annual MD&A for a discussion of these forward-looking statements and the risks that impact these forward-looking statements. Investors are also referred to the risks described under the title “Risks and Uncertainties” in our 2025 Annual MD&A and in our 2025 AIF. This list of important factors affecting forward-looking statements is not exhaustive, and reference should be made to the other factors discussed in public filings with securities regulatory authorities, including the SEC. Accordingly, investors should exercise caution in relying upon forward-looking statements, and West Fraser undertakes no obligation to publicly update or revise any forward-looking statements, whether written or oral, to reflect subsequent events or circumstances except as required by applicable securities laws.

NOTE TO UNITED STATES READERS REGARDING DIFFERENCES

BETWEEN UNITED STATES AND CANADIAN REPORTING PRACTICES

West Fraser is permitted to prepare this Annual Report in accordance with Canadian disclosure requirements which require Canadian public companies to prepare financial statements in accordance with International Financial Reporting Standards as issued by the International Accounting Standards Board ("IFRS Accounting Standards"). Accordingly, the Company’s 2025 Audited Annual Financial Statements have been prepared in accordance with IFRS Accounting Standards. Therefore, West Fraser’s 2025 Audited Annual Financial Statements incorporated by reference in this Annual Report may not be comparable to financial statements prepared in accordance with US GAAP. Our Independent Registered Public Accounting Firm performs an audit of the consolidated financial statements in accordance with the standards of the Public Company Accounting Oversight Board (United States) (the "PCAOB"). Our Independent Registered Public

Accounting Firm is independent within the meaning of the Chartered Professional Accountants of British Columbia ("CPABC") Code of Professional Conduct in addition to the auditor independence standards of the PCAOB and the SEC.

CONTROLS AND PROCEDURES

West Fraser is responsible for establishing and maintaining disclosure controls and procedures (as such term is defined in Rules 13a-15(e) of the Exchange Act) and internal control over financial reporting (as such term is defined in Rules 13a-15(f) of the Exchange Act).

Disclosure Controls and Procedures

Disclosure controls and procedures are defined in Rule 13a-15(e) of the Exchange Act to mean controls and other procedures of an issuer that are designed to ensure that information required to be disclosed by the issuer in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms and includes, without limitation, controls and procedures designed to ensure that such information is accumulated and communicated to the issuer’s management, including its principal executive and principal financial officers, or persons performing similar functions, as appropriate, to allow timely decisions regarding required disclosure.

Management, under the supervision and with the participation of our President and Chief Executive Officer (“CEO”) and the Executive Vice-President and Chief Financial Officer (“CFO”), has conducted an evaluation of our disclosure controls and procedures as of December 31, 2025. Based on this evaluation, management, under the supervision of our CEO and CFO, has concluded that our disclosure controls and procedures were effective as of December 31, 2025.

Management's Report on Internal Control over Financial Reporting

Management, under the supervision of the CEO and CFO, is responsible for establishing and maintaining adequate internal control over financial reporting, as defined under National Instrument 52-109 - Certification or Disclosure in Issuer's Annual and Interim Filings, in Canada, and the Exchange Act, in the United States, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of consolidated financial statements for external reporting purposes in accordance with IFRS Accounting Standards.

Management, under the supervision of the CEO and CFO, has assessed the effectiveness of the Company’s internal control over financial reporting as of December 31, 2025 based on the criteria set forth in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (“COSO”). Based on this assessment, management has concluded that the Company’s internal control over financial reporting was effective as of December 31, 2025.

Due to its inherent limitations, internal control over financial reporting may not prevent or detect misstatements on a timely basis. Additionally, projections of any evaluation of the effectiveness of internal control over financial reporting to future periods are subject to the risk that the controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Attestation Report of the Independent Registered Public Accounting Firm

The effectiveness of the Company’s internal control over financial reporting as of December 31, 2025 has been audited by PricewaterhouseCoopers LLP, the Company’s independent registered public accounting firm, as stated in their report included with our 2025 Audited Annual Financial Statements, filed as Exhibit 99.2 to this Annual Report, and incorporated herein by reference.

Changes in Internal Control over Financial Reporting

There has been no change in our internal control over financial reporting during the year ended December 31, 2025 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

AUDIT COMMITTEE

Our Board of Directors (the "Board") has established a separately-designated independent Audit Committee (the "Audit Committee") of the Board in accordance with Section 3(a)(58)(A) of the Exchange Act for the purpose of overseeing our accounting and financial reporting processes and the audits of our annual financial statements. As at the date of this Annual Report, the Audit Committee was comprised of Gillian D. Winckler (Chair), Doyle Beneby, Reid Carter, and Colleen M. McMorrow. The Board has determined that each of the members of the Audit Committee is independent as determined under Rule 10A-3 of the Exchange Act and Section 303A.02 of the NYSE Listed Company Manual.

AUDIT COMMITTEE FINANCIAL EXPERT

Our Board has determined that Gillian D. Winckler, the Chair of the Audit Committee, is an audit committee financial expert (as that term is defined in Form 40-F) and is an independent director under applicable securities laws and the listing requirements of the NYSE.

The SEC has indicated that the designation of a person as an audit committee financial expert does not make such person an "expert" for any purpose, or impose any duties, obligations or liability on such person that are greater than those imposed on members of the Audit Committee and the Board who do not carry this designation, or affect the duties, obligations or liability of any other member of the Audit Committee or Board.

PRINCIPAL ACCOUNTING FEES AND SERVICES

Our independent registered public accounting firm is PricewaterhouseCoopers LLP, Vancouver, Canada, (PCAOB ID No. 271).

The following table sets forth information regarding aggregate amounts billed to us by our independent registered public accounting firm for each of our last two fiscal years ended December 31 in thousands of United States dollars1:

			2025			2024
Audit Fees			$	2,765		$	2,714
Audit-Related Fees			137			121
Tax Fees			17			—
All Other Fees			101			52
Total			3,020			2,887

1.Amounts represent actual and estimated fees related to the respective fiscal years noted. Amounts are billed and paid in Canadian dollars, British pound sterling, and Euros and have been translated to United States dollars using the average exchange rate for the respective years noted.

Audit Fees

Audit fees relate to the integrated audit of our annual consolidated financial statements and the effectiveness of internal control over financial reporting, reviews of our interim consolidated financial statements, and statutory audits of the financial statements of our subsidiaries.

Audit-Related Fees

Audit-Related Fees include employee benefit audits.

Tax Fees

Tax fees relate to tax compliance services.

All Other Fees

All other fees relate to fees in connection with limited assurance engagements relating to climate matters and translation services.

Audit Committee Pre-Approval Policies

The Audit Committee has adopted a policy that sets out the pre-approval requirements related to services to be performed by our independent auditors. The policy provides that the Audit Committee will annually review proposed audit, audit-related, tax and other services (to be submitted by the CFO and the independent auditor), and will provide general approval of described services, usually including specific maximum fee amounts.

Unless a service has received general pre-approval, it will require specific pre-approval by the Audit Committee. The Audit Committee is permitted to delegate pre-approval authority to any of its members. The Audit Committee reports on the pre-approval process to the full Board from time to time.

None of the services provided by PricewaterhouseCoopers LLP in the fiscal year ended December 31, 2025 were treated as exempt from pre-approval pursuant to the de minimis provision of paragraph (c)(7)(i)(C) of Rule 2-01 of Regulation S-X.

OFF-BALANCE SHEET ARRANGEMENTS

West Fraser has not entered into any off-balance sheet arrangements that have or are reasonably likely to have a current or future effect on our financial condition, changes in financial condition, revenues, expenses, results of operations, liquidity, capital expenditures or capital resources that are material to investors.

CONTRACTUAL OBLIGATIONS

The required tabular disclosure of contractual obligations is included in “Liquidity & Capital Resources – Contractual Obligations” of the 2025 Annual MD&A, filed as Exhibit 99.3 to this Annual Report, and incorporated herein by reference.

CODE OF ETHICS

West Fraser has adopted a “code of ethics” (as that term is defined in Form 40-F), entitled the West Fraser Code of Conduct that applies to all directors, officers and employees of West Fraser, including its CEO and CFO (the “Code of Ethics”). A copy of the Code of Ethics is posted on West Fraser’s website at https://www.westfraser.com/investors/corporate/code-conduct.

There were no waivers granted in respect of the Code of Ethics during the fiscal year ended December 31, 2025. If there is an amendment to the Code of Ethics, West Fraser intends to disclose any such amendment by posting such information on West Fraser's website. Unless and to the extent specifically referred to herein, the information on West Fraser's website shall not be deemed to be incorporated by reference in this Annual Report. Except for the Code of Ethics, and notwithstanding any reference to West Fraser's website or other websites in this Annual Report or in the documents incorporated by reference herein or attached as exhibits hereto, no information contained on West Fraser's website or any other site shall be incorporated by reference in this Annual Report or in the documents incorporated by reference herein or attached as exhibits hereto.

NYSE CORPORATE GOVERNANCE

West Fraser’s common shares are listed for trading on NYSE. Section 303A.11 of the NYSE Listed Company Manual requires foreign private issuers, such as West Fraser, to disclose any significant ways in which their corporate governance practices differ from those followed by domestic companies under the NYSE listing standards. Section 310.00 of the NYSE Listed Company Manual generally requires that a listed company's by-laws provide for a quorum for any meeting of the holders of the company's common shares that is sufficiently high to ensure a representative vote. Pursuant to the NYSE corporate governance rules we, as a foreign private issuer, have elected to comply with practices that are permitted under Canadian law in lieu of the provisions of Section 310.00. West Fraser’s by-laws provide that the quorum requirement for meetings of shareholders is a minimum of 25% of the outstanding common shares in attendance at each meeting of shareholders, which is less than the 50% majority quorum requirement of many U.S. incorporated NYSE listed issuers.

Except as stated above, we are in compliance with the rules generally applicable to U.S. domestic companies listed on the NYSE. We may in the future decide to use other foreign private issuer exemptions with respect to some of the other NYSE listing requirements. Following our home country governance practices, as opposed to the requirements that would

otherwise apply to a company listed on the NYSE, may provide less protection than is accorded to investors under the NYSE listing requirements applicable to U.S. domestic issuers.

INTERACTIVE DATA FILE

West Fraser has submitted to the SEC an interactive data file in connection with this Annual Report.

UNDERTAKING

West Fraser undertakes to make available, in person or by telephone, representatives to respond to inquiries made by the SEC, and to furnish promptly, when requested to do so by the SEC, information relating to: the securities registered pursuant to Form 40-F; the securities in relation to which the obligation to file an annual report on Form 40-F arises; or transactions in said securities.

CONSENT TO SERVICE OF PROCESS

West Fraser has previously filed an Appointment of Agent for Service of Process and Undertaking on Form F-X signed by the Company and its agent for service of process with respect to the class of securities in relation to which the obligation to file this Annual Report arises. Any change to the name or address of West Fraser’s agent for service shall be communicated promptly to the SEC by amendment to Form F-X referencing the file number of the Company.

SIGNATURES

Pursuant to the requirements of the Exchange Act, West Fraser certifies that it meets all of the requirements for filing on Form 40-F and has duly caused this Annual Report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date: February 11, 2026			WEST FRASER TIMBER CO. LTD. By: /s/ Sean P. McLaren
			Sean P. McLaren President and Chief Executive Officer

EXHIBIT INDEX

Exhibit Number			Exhibit Description
97.1			West Fraser Timber Co. Ltd. Clawback Policy
99.1			Annual Information Form of the Company for the year ended December 31, 2025
99.2			Audited consolidated financial statements of the Company and notes thereto as at December 31, 2025 and 2024 and for the years ended December 31, 2025 and 2024, together with the report of the Independent Registered Public Accounting Firm and Management's Report on Internal Control over Financial Reporting
99.3			Management’s Discussion and Analysis for the year ended December 31, 2025
99.4			Certification of Chief Executive Officer pursuant to Rule 13a-14(a) of the Exchange Act, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
99.5			Certification of Chief Financial Officer pursuant to Rule 13a-14(a) of the Exchange Act, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
99.6			Certification of Chief Executive Officer pursuant to Rule 13a-14(b) of the Exchange Act and 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
99.7			Certification of Chief Financial Officer pursuant to Rule 13a-14(b) of the Exchange Act and 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
99.8			Consent of PricewaterhouseCoopers LLP
101			The following financial information from the Company's Annual Report on Form 40-F for the year ended December 31, 2025 formatted in Inline XBRL (Extensible Business Reporting Language): (i) the Consolidated Balance Sheets, (ii) the Consolidated Statements of Loss and Comprehensive Loss, (iii) the Consolidated Statements of Changes in Shareholders' Equity, (iv) the Consolidated Statements of Cash Flows, and (vi) Notes to Consolidated Financial Statements.
104			Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101)

Exhibits 99.1, 99.2, 99.3 and 99.8 of this Annual Report are incorporated by reference into the Company's Registration Statement on Form S-8 (File No. 333-252631), originally filed with the SEC on February 2, 2021, and the Registration Statement on Form S-8 (File No. 333-257254), originally filed with the SEC on June 21, 2021.

FAQ

What is West Fraser Timber Co. Ltd. (WFG) filing with the SEC in this Form 40-F?

West Fraser is filing its 2025 annual report on Form 40-F as a Canadian foreign private issuer. The report includes its Annual Information Form, audited IFRS financial statements for 2025 and 2024, and Management’s Discussion and Analysis for the year ended December 31, 2025.

How many West Fraser (WFG) common shares were outstanding at the end of 2025?

West Fraser reports 78,299,822 common shares outstanding as of the close of the period covered by the annual report. This figure represents the company’s outstanding common equity base on which shareholders’ ownership and per-share measures are calculated for the year ended December 31, 2025.

What do West Fraser’s 2025 audit and related fees to PricewaterhouseCoopers LLP total?

West Fraser’s 2025 total fees to PricewaterhouseCoopers LLP were $3,020 thousand, including $2,765 thousand of audit fees, $137 thousand of audit-related fees, $17 thousand of tax fees, and $101 thousand of other fees. Comparable 2024 total fees were $2,887 thousand in aggregate.

What does West Fraser (WFG) say about its internal controls over financial reporting for 2025?

Management concluded West Fraser’s internal control over financial reporting was effective as of December 31, 2025, using the COSO 2013 framework. PricewaterhouseCoopers LLP audited this assessment, and the company notes there were no changes in 2025 that materially affected these internal controls.

Does West Fraser have any material off-balance sheet arrangements according to the 2025 Form 40-F?

West Fraser states it has not entered into material off-balance sheet arrangements that are reasonably likely to affect its financial condition, results of operations, liquidity, capital expenditures, or capital resources. This disclosure focuses on arrangements that could be significant but are not recorded on the balance sheet.

How does West Fraser’s corporate governance differ from typical NYSE U.S. companies?

West Fraser uses certain Canadian home-country governance practices as a foreign private issuer. Its by-laws set a quorum for shareholder meetings at 25% of outstanding common shares, below the majority level common among U.S. NYSE issuers, which may provide comparatively less investor protection in this specific area.

What code of ethics and audit committee structure does West Fraser (WFG) disclose?

West Fraser has a Code of Conduct applying to all directors, officers and employees, including the CEO and CFO, and reports no waivers in 2025. Its independent Audit Committee comprises four directors, with chair Gillian D. Winckler designated as an audit committee financial expert under Form 40-F definitions.