X0508 4 2026-03-05 0001004434 AFFILIATED MANAGERS GROUP, INC. AMG 0002017736 Padiyar Kavita C/O AFFILIATED MANAGERS GROUP, INC. 777 SOUTH FLAGLER DRIVE WEST PALM BEACH FL 33401 1 General Counsel & Corp. Sec. 0 Common Stock 2026-03-05 4 M 0 2288 0 A 44728 D Common Stock 2026-03-05 4 A 0 2426 0 A 47154 D Common Stock 2026-03-05 4 F 0 2282 299.18 D 44872 D Common Stock 2026-03-09 4 S 0 2200 278.24 D 42672 D Stock Units 2026-03-05 4 M 0 2288 0 D Common Stock 2288 2670 D Stock Units 2026-03-05 4 A 0 1191 0 A Common Stock 1191 1191 D Reflects the vesting of previously reported awards. Awards vest 2023-2029. Award granted in March 2023, 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 sale reflects the weighted average sales price of the shares sold; the individual transaction prices ranged from $278.00 to $278.51. Specific transaction details will be provided to the SEC upon request. The award, issued under the Company's 2020 Equity Incentive Plan, vests in four equal installments on each of March 5, 2027, 2028, 2029, and 2030. /s/ Kavita Padiyar 2026-03-09