| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Horgen Jay C. | Chief Executive Officer, Director | C/O AFFILIATED MANAGERS GROUP, INC., 777 SOUTH FLAGLER DRIVE, WEST PALM BEACH | /s/ Kavita Padiyar, Attorney-in-Fact | 04 Sep 2025 | 0001432993 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | AMG | Common Stock | Options Exercise | $5,586,750 | +75,000 | +15% | $74.49 | 559,322 | 02 Sep 2025 | Direct | |
| transaction | AMG | Common Stock | Tax liability | $10,333,702 | -44,935 | -8% | $229.97 | 514,387 | 02 Sep 2025 | Direct | |
| holding | AMG | Common Stock | 34,058 | 02 Sep 2025 | By Family Trusts |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Underlying Class | Amount | Exercise Price | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | AMG | Employee Stock Option (Right to Buy) | Options Exercise | $0 | -75,000 | -50% | $0.000000 | 75,000 | 02 Sep 2025 | Common Stock | 75,000 | $74.49 | Direct |