| 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 | 23 Dec 2025 | 0001432993 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | AMG | Common Stock | Gift | $0 | -4,000 | -0.78% | $0.000000 | 510,387 | 23 Dec 2025 | Direct | F1 |
| holding | AMG | Common Stock | 34,058 | 23 Dec 2025 | By Family Trusts |
| Id | Content |
|---|---|
| F1 | Gift of common stock to a charitable donor advised fund. |