X0508 4 2024-03-05 0001004434 AFFILIATED MANAGERS GROUP, INC. AMG 0001776685 Wojcik Thomas M C/O AFFILIATED MANAGERS GROUP, INC. 777 SOUTH FLAGLER DRIVE WEST PALM BEACH FL 33401 1 Chief Financial Officer 0 Common Stock 2024-03-05 4 M 0 5678 0 A 53539 D Common Stock 2024-03-05 4 A 0 13406 0 A 66945 D Common Stock 2024-03-05 4 F 0 9778 158.58 D 57167 D Stock Units 2024-03-05 4 M 0 5678 0 D Common Stock 5678 11773 D Stock Units 2024-03-05 4 A 0 6432 0 A Common Stock 6432 6432 D Employee Stock Option (Right to Buy) 74.49 2024-03-05 4 A 0 373145 0 A 2024-08-15 2026-08-15 Common Stock 373145 373145 D Reflects the vesting of previously reported awards. Awards vest 2022-2027. Award granted in March 2021, which settled following the achievement of performance conditions previously described in the Company's annual meeting proxy statements. Reflects the automatic surrender of shares of common stock to the Company to satisfy tax withholding obligations related to the vesting of the awards described above. The award, issued under the Company's 2020 Equity Incentive Plan, vests in four equal installments on each of March 5, 2025, 2026, 2027, and 2028. Reflects an option award granted in August 2019, which vests on August 15, 2024 following the satisfaction of applicable performance and service conditions previously described in the Company's annual meeting proxy statements. /s/ Kavita Padiyar, Attorney-in-Fact 2024-03-07