X0508 4 2024-08-02 0000062709 MARSH & MCLENNAN COMPANIES, INC. MMC 0001269360 MCGIVNEY MARK C 1166 AVENUE OF THE AMERICAS NEW YORK NY 10036 1 Chief Financial Officer 1 Common Stock 2024-08-02 4 M 0 10265 118.865 A 43943 D Common Stock 2024-08-02 4 S 0 3791 225.7664 D 40152 D Common Stock 2024-08-02 4 S 0 6074 226.7542 D 34078 D Common Stock 2024-08-02 4 S 0 400 227.3075 D 33678 D Common Stock 2024-08-05 4 M 0 5200 118.865 A 38878 D Common Stock 2024-08-05 4 S 0 5200 225.03 D 33678 D Stock Options (Right to Buy) 118.865 2024-08-02 4 M 0 10265 0 D 2030-02-18 Common Stock 10265 56128 D Stock Options (Right to Buy) 118.865 2024-08-05 4 M 0 5200 0 D 2030-02-18 Common Stock 5200 50928 D This transaction was effected pursuant to a Rule 10b5-1 trading plan previously adopted by the Reporting Person. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $225.140 to $226.130. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the Staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (1) to this Form 4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $226.210 to $227.190. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the Staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (1) to this Form 4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $227.290 to $227.325. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the Staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (1) to this Form 4. These options were granted on February 19, 2020 and vested in four equal annual installments on February 19th of 2021, 2022, 2023 and 2024. /s/ Tessa Patti, Attorney-in-fact 2024-08-06