X0508 4 2026-02-24 0000062709 MARSH & MCLENNAN COMPANIES, INC. MRSH 0001580963 Doyle John Q 1166 AVENUE OF THE AMERICAS NEW YORK NY 10036 1 President and CEO 0 Stock Options (Right to Buy) 176.99 2026-02-24 4 A 0 217501 0 A 2036-02-23 Common Stock 217501 217501 D Restricted Stock Units 2026-02-24 4 A 0 59510 0 A Common Stock 59510 59510 D These options were granted on February 24, 2026 and vest in four equal annual installments on February 24th of 2027, 2028, 2029 and 2030. The security converts to Marsh & McLennan Companies common stock on a 1-for-1 basis. These restricted stock units relate to performance stock units that were granted on February 23, 2023 for the performance period 2023-2025. The performance factor for these performance stock units was determined on February 24, 2026. Not applicable. /s/ Tessa Patti, Attorney-in-fact 2026-02-26