MRSH: Other company developments

Item 8.01 Other Events On October 20, 2026, Marsh & McLennan Companies, Inc. (the “Company”) entered into an underwriting agreement (the “Underwriting Agreement”) with the several underwriters party thereto (the “Underwriters”), pursuant to which the Underwriters agreed to purchase from the Company €600 million aggregate principal amount of its 4.250% Senior Notes due 2032 and €600 million aggregate principal amount of its 4.625% Senior Notes due 2036 (collectively, the “Notes”). The Notes were registered under the Company’s effective shelf registration statement on Form S-3 (Registration No. 333-280979) under the Securities Act of 1933, as amended, as filed with the Securities and Exchange Commission on July 24, 2024, and were offered by means of the Company’s prospectus dated July 24, 2024, as supplemented by the prospectus supplement dated October 20, 2026. The Notes were issued on October 27, 2026, pursuant to the Indenture dated July 15, 2011, by and between the Company and The Bank of New York Mellon, as trustee (the “Trustee”), filed as Exhibit 4.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2011 and incorporated herein by reference, as supplemented by the Twenty-Second Supplemental Indenture (the “Supplemental Indenture”), dated as of October 27, 2026, by and between the Company and the Trustee. In connection with the closing of the offering of the Notes, the Company also entered into a Paying Agency Agreement (the “Paying Agency Agreement”), dated as of October 27, 2026, with The Bank of New York Mellon, London Branch, as paying agent. The foregoing descriptions of the Underwriting Agreement, the Supplemental Indenture, the Notes and the Paying Agency Agreement are summaries and are qualified in their entirety by the Underwriti