BMO 2026-C15 Mortgage Trust

Item 8.01. Other Events. On August 31, 2026 (the “Closing Date”), BMO Commercial Mortgage Securities LLC (the “Depositor”) caused the issuance, pursuant to a Pooling and Servicing Agreement, dated as of August 1, 2026 (the “Pooling and Servicing Agreement”), between the Depositor, as Depositor, KeyBank National Association, as a Master Servicer, Rialto Capital Advisors, LLC, as a Special Servicer, National Cooperative Bank, N.A., as a Master Servicer and as a Special Servicer solely with respect to the NCB Mortgage Loans, Park Bridge Lender Services LLC, as Operating Advisor and as Asset Representations Reviewer, Citibank, N.A., as Certificate Administrator, and Wilmington Savings Fund Society, FSB, as Trustee, of the BMO 2026-C15 Mortgage Trust, Commercial Mortgage Pass-Through Certificates, Series 2026-C15 (the “Certificates”). Capitalized terms used but not defined herein shall have the meanings assigned to them in the Pooling and Servicing Agreement. The Pooling and Servicing Agreement was attached as Exhibit 4.1 to the Depositor’s Current Report on Form 8-K/A, filed with the Securities and Exchange Commission (the “Commission”) on August 31, 2026 under Commission File No. 333-280224-16. The Certificates consist of the following classes, designated as (i) the Class A-1, Class A-4, Class A-5, Class A-SB, Class X-A, Class X-B, Class A-S, Class B and Class C Certificates (collectively, the “Public Certificates”), (ii) the Class D-RR, Class E-RR, Class F-RR, Class G-RR, Class J-RR and Class R Certificates (collectively, the “Private Certificates”); and (iii) the Class S Certificates. All of the Public Certificates, having an aggregate initial principal amount of $650,555,000, were sold to BMO Capital Markets Corp. (“BMO Capital Markets”), Citigroup Global Markets Inc. (“CGMI”), Deutsche Bank Securities Inc. (“DBSI”), J.P Morgan Securities LLC (“JPMS”), KeyBanc Capital Markets Inc. (“KeyBanc Capital”), Nomura Securities International, Inc. (“Nomura Securities”), SG Americas Securities, LLC (“SGAS”), UBS Securities LLC (“UBS Securities”), Wells Fargo Securities, LLC (“Wells Fargo Securities”), Academy Securities, Inc. (“Academy”), Bancroft Capital, LLC (“Bancroft”), Drexel Hamilton, LLC (“Drexel”), Mischler Financial Group, Inc. (“Mischler”) and Natixis Securities Americas LLC (“Natixis” and, together with BMO Capital Markets, CGMI, DBSI, JPMS, KeyBanc Capital, Nomura Securities, SGAS, UBS Securities, Wells Fargo Securities, Academy, Bancroft, Drexel and Mischler, in such capacity, the “Underwriters”), pursuant to an Underwriting Agreement, dated as of August 14, 2026 (the “Underwriting Agreement”), between the Depositor and the Underwriters. BMO Capital Markets, CGMI, DBSI, JPMS, KeyBanc Capital, Nomura Securities, SGAS, UBS Securities and Wells Fargo Securities are acting as co-lead managers in connection with the offering of the Public Certificates. The Public Certificates were offered by the Underwriters for sale to the public, pursuant to the Depositor’s Preliminary Prospectus, dated August 10, 2026, and by the Prospectus, dated August 14, 2026 (the “Prospectus”), in negotiated transactions or otherwise at varying prices determined at the time of sale. In connection with the issuance, and sale to the Underwriters, of the Public Certificates, a legal opinion was rendered related to the validity of, and certain federal income tax considerations relating to, the Public Certificates, which legal opinion is attached hereto as