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 OCTOBER 2025 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 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. Form 20-F ¨ Form 40-F ý Indicate ...