X0607 3 2026-04-01 0 0000062709 MARSH & MCLENNAN COMPANIES, INC. MRSH 0002129039 Moynihan Edward Francis false 1166 AVENUE OF THE AMERICAS NEW YORK NY 10036 1 President & CEO, Oliver Wyman Common Stock 9121 D Restricted Stock Units Common Stock 8867 D Stock Options (Right to Buy) 73.20 2027-02-21 Common Stock 9161 D Stock Options (Right to Buy) 83.05 2028-02-20 Common Stock 6151 D Stock Options (Right to Buy) 90.79 2029-02-18 Common Stock 5609 D Stock Options (Right to Buy) 118.87 2030-02-18 Common Stock 4328 D Stock Options (Right to Buy) 117.53 2031-02-21 Common Stock 4832 D Stock Options (Right to Buy) 151.37 2032-02-22 Common Stock 3785 D Stock Options (Right to Buy) 164.15 2033-02-22 Common Stock 2982 D Stock Options (Right to Buy) 200.47 2034-02-21 Common Stock 2385 D Stock Options (Right to Buy) 230.29 2035-02-17 Common Stock 2617 D Not applicable. The security converts to Marsh & McLennan Companies common stock on a 1-for-1 basis. These options were granted on February 22, 2017 and vested in four equal annual installments on February 22nd of 2018, 2019, 2020 and 2021. These options were granted on February 21, 2018 and vested in four equal annual installments on February 21st of 2019, 2020, 2021 and 2022. These options were granted on February 19, 2019 and vested in four equal annual installments on February 19th of 2020, 2021, 2022 and 2023. These options were granted on February 19, 2020 and vested in four equal annual installments on February 19th of 2021, 2022, 2023 and 2024. These options were granted on February 22, 2021 and vested in four equal annual installments on February 22nd of 2022, 2023, 2024 and 2025. These options were granted on February 23, 2022 and vested in four equal annual installments on February 23rd of 2023, 2024, 2025 and 2026. These options were granted on February 23 2023 and vested in four equal annual installments on February 23rd of 2024, 2025, 2026 and 2027. These options were granted on February 22, 2024 and vest in four equal annual installments on February 22nd of 2025, 2026, 2027 and 2028. These options were granted on February 18, 2025 and vest in four equal annual installments on February 18th of 2026, 2027, 2028 and 2029. /s/ Tessa Patti, Attorney-in-fact 2026-04-10