AMG · Affiliated Managers Group, Inc. · Insider Trading

Reflects the vesting of previously reported awards. Awards vested in 2026.

Inclusive of previously reported deferred stock units.

Reflects the vesting of previously reported awards. Awards vest 2023-2027.

Reflects the vesting of previously reported awards. Awards vested in 2026.

Reflects the vesting of a previously reported award. Award vested in 2026.

Reflects the vesting of previously reported awards. Awards vest 2023-2027.

Reflects the vesting of a previously reported award. Award vested in 2026.

Reflects the vesting of previously reported awards. Awards vest 2023-2027.

Inclusive of previously reported deferred stock units.

Reflects the vesting of previously reported awards. Awards vest 2023-2027.

Each stock unit represents a right to receive one share of the Company's common stock upon vesting. The stock units vest in full on August 15, 2027.

Each stock unit represents a right to receive one share of the Company's common stock upon vesting. The stock units vest in full on August 15, 2027.

Each stock unit represents a right to receive one share of the Company's common stock upon vesting. The stock units vest in full on August 15, 2027.

Each stock unit represents a right to receive one share of the Company's common stock upon vesting. The stock units vest in full on August 15, 2027.

Each stock unit represents a right to receive one share of the Company's common stock upon vesting. The stock units vest in full on August 15, 2027.

Reflects cash fees that the director has elected to defer under the Company's deferred compensation plan, which are notionally invested in a measurement fund tracking the Company's common stock during the deferral period. Each deferred stock unit is equal to one share of the Company's common stock, and becomes distributable in common stock upon the reporting person's separation from service as a member of the Board of Directors of the Company.

Each stock unit represents a right to receive one share of the Company's common stock upon vesting. The stock units vest in full on August 15, 2027.

The price reflects the weighted average sales price of the shares sold; the individual transaction prices ranged from $336.33 to $341.88. Specific transaction details will be provided to the SEC upon request.

Reflects the transfer of 150,000 shares of common stock to a grantor retained annuity trust.

The price reflects the weighted average price of shares purchased on the open market; the individual transaction prices ranged from $303.00 to $305.00. Specific transaction details will be provided to the SEC upon request.

The sale reflects the weighted average sales price of the shares sold; the individual transaction prices ranged from $303.54 to $307.71. Specific transaction details will be provided to the SEC upon request.

Each stock unit represents a right to receive one share of the Company's common stock upon vesting. The stock units vest in full on August 15, 2027.

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 sale reflects the weighted average sales price of the shares sold; the individual transaction prices ranged from $285.89 to $286.69. Specific transaction details will be provided to the SEC upon request.

Reflects the vesting of previously reported awards. Awards vest 2023-2029.

Reflects the vesting of previously reported awards. As previously disclosed, all of the reporting person's then-outstanding unvested equity awards were cancelled and terminated on March 6, 2026 in connection with the reporting person's termination of employment on such date.

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.

Reflects cash fees that the director has elected to defer under the Company's deferred compensation plan, which are notionally invested in a measurement fund tracking the Company's common stock during the deferral period. Each deferred stock unit is equal to one share of the Company's common stock, and becomes distributable in common stock upon the reporting person's separation from service as a member of the Board of Directors of the Company.

Reflects the vesting of previously reported awards. Awards vest 2023-2027.

Reflects the vesting of previously reported awards. Awards vest 2023-2029.

Each stock unit represents a right to receive one share of the Company's common stock upon vesting. The stock units vest in full on March 5, 2027.

Reflects the vesting of previously reported awards. Awards vest 2023-2027.

Each stock unit represents a right to receive one share of the Company's common stock upon vesting. The stock units vest in full on March 5, 2027.

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 vesting of previously reported awards. Awards vest 2023-2027.

Inclusive of previously reported deferred stock units.

Each stock unit represents a right to receive one share of the Company's common stock upon vesting. The stock units vest in full on March 5, 2027.

Reflects the vesting of previously reported awards. Awards vest 2023-2027.

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 vesting of previously reported awards. As previously disclosed, all of the reporting person's then-outstanding unvested equity awards were cancelled and terminated on March 6, 2026 in connection with the reporting person's termination of employment on such date.

Each stock unit represents a right to receive one share of the Company's common stock upon vesting. The stock units vest in full on March 5, 2027.

Reflects the vesting of previously reported awards. Awards vest 2023-2027.

Inclusive of previously reported deferred stock units.

Reflects the vesting of previously reported awards. Awards vest 2023-2026.

Reflects the vesting of a previously reported award. Award vests 2026-2029.

Reflects the vesting of previously reported awards. Awards vest 2023-2026.

Inclusive of previously reported deferred stock units.

Reflects cash fees that the director has elected to defer under the Company's deferred compensation plan, which are notionally invested in a measurement fund tracking the Company's common stock during the deferral period. Each deferred stock unit is equal to one share of the Company's common stock, and becomes distributable in common stock upon the reporting person's separation from service as a member of the Board of Directors of the Company.