MRSH: Financial results

Item 2.02 Results of Operations and Financial Condition On October 15, 2026, Marsh & McLennan Companies, Inc. issued a press release reporting financial results for the third quarter ended September 30, 2026, and announcing that a conference call to discuss such results will be held at 8:30 a.m. Eastern time on October 15, 2026. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference. For purposes of Section 18 of the Securities Exchange Act of 1934, the press release is deemed furnished not filed. Item 9.01 Financial Statements and Exhibits (d) Exhibits 99.1 Press release issued by Marsh & McLennan Companies, Inc. on October 15, 2026. 2 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 hereunto duly authorized. MARSH & McLENNAN COMPANIES, INC. By: /s/ Connor Kuratek Name: Connor Kuratek Title: Deputy General Counsel & Corporate Secretary Date: October 15, 2026 3 EXHIBIT INDEX Exhibit No. Exhibit 99.1 Press release issued by Marsh & McLennan Companies, Inc. on October 15, 2026 4