BMO: 6-K company filing

6-K 1 d538647d6k.htm 6-K 6-K 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: September, 2026 Commission File Number: 001-13354 BANK OF MONTREAL (Name of Registrant) 100 King Street West 1 First Canadian Place Toronto, Ontario Canada, M5X 1A1 (Executive Offices) 129 rue Saint-Jacques Montreal, Quebec Canada, H2Y 1L6 (Head 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 ☒ INCORPORATION BY REFERENCE The information contained in this Form 6-K and any exhibits hereto shall be deemed filed with the Securities and Exchange Commission (“SEC”) solely for purposes of incorporation by reference into and as part of the following registration statement of the registrant on file with and declared effective by the SEC: 1. Registration Statement – Form F-3 – File No. 333-285508 EXHIBIT INDEX Exhibit Description of Exhibit 1.1 Underwriting Agreement, dated September 8, 2026, among Bank of Montreal and BMO Capital Markets Corp., Barclays Capital Inc., Citigroup Global Markets Inc., Goldman Sachs & Co. LLC, Morgan Stanley & Co. LLC and UBS Securities LLC, as representatives of the several Underwriters named therein. 4.1 Ninth Supplemental Indenture, dated as of September 16, 2026, between the Bank and Computershare Trust Company, N.A., as successor to Wells Fargo Bank, National Association, as Trustee. 5.1 Opinion of Sullivan & Cromwell LLP, U.S. counsel to the Bank. 5.2 Opinion of Osler, Hoskin & Harcourt LLP, Canadian counsel to the Bank. 8.1 Opinion of Sullivan & Cromwell LLP, U.S. tax counsel to the Bank. 8.2 Opinion of Torys LLP,