Methanex 董事会批准常规发行人收购计划，拟回购并注销最多约 5% 已发行股份

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 OF THE

SECURITIES EXCHANGE ACT OF 1934

FOR THE MONTH OF OCTOBER 2026

COMMISSION FILE NUMBER 000-20115

METHANEX CORPORATION

(Registrant’s name)

SUITE 1800, 200 BURRARD STREET, VANCOUVER, BC V6C 3M1 CANADA

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or 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): o

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): o

METHANEX CORPORATION

(the “Company”)

MATERIAL CHANGE REPORT

FORM 51-102F3

1.NAME AND ADDRESS OF COMPANY

Methanex Corporation

1800 Waterfront Centre

200 Burrard Street

Vancouver, British Columbia V6C 3M1

2.DATE OF MATERIAL CHANGE

October 29, 2026

3.NEWS RELEASE

The news release announcing this material change was issued on October 29, 2026 in Canada and the United States.

4.    SUMMARY OF MATERIAL CHANGE

Methanex Corporation (the “Company”) announced on October 29, 2026 that its Board of Directors has approved a Normal Course Issuer Bid (“NCIB”). The Company will purchase for cancellation up to approximately 5% of the issued and outstanding shares as of October 29, 2026.

5.    FULL DESCRIPTION OF MATERIAL CHANGE

5.1    FULL DESCRIPTION OF MATERIAL CHANGE

Under the NCIB, the Company will purchase for cancellation up to 3,868,213 common shares ("Shares"), representing approximately 5% of the 77,364,263 Shares issued and outstanding as of October 29, 2026.

Purchases under the NCIB will commence on November 4, 2026 and end no later than November 3, 2027. Purchases will be made from time to time at the then current market price of the Company’s Shares and all Shares purchased under the NCIB will be cancelled.

Purchases pursuant to the NCIB will be made on the open market through the facilities of the NASDAQ Global Selection Market (“NASDAQ”) and alternative trading systems in the United States pursuant to Rule 10b-18 under the U.S. Securities Exchange Act of 1934.

Subject to certain exceptions for block purchases, daily repurchases under the program through the NASDAQ and alternative trading systems in the United States will not exceed 25 percent of the Company’s average daily trading volume for the four-week period preceding the date of purchase. The Company will enter into an automatic securities purchase plan with its broker in connection with purchases to be made under the NCIB.

5.2    DISCLOSURE FOR RESTRUCTURING TRANSACTIONS

Not applicable.

6.    RELIANCE ON SUBSECTION 7.1(2) OF NATIONAL INSTRUMENT 51-102

Not applicable.

7.    OMITTED INFORMATION

Not applicable.

8.    EXECUTIVE OFFICER

For further information, contact:

Kevin Price

SVP, General Counsel & Corporate Secretary

604-661-2658

9.    DATE OF REPORT

October 29, 2026

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.