InsiderTrades

Form 4 for AMG AFFILIATED MANAGERS GROUP, INC.

Accepted 2026-08-18 17:04:24 ET · period of report 2026-08-15 · accession 0001004434-26-000102 · SEC index · Original document

Summary rows

Aggregated the way they appear in lists: one row per insider, transaction code and security table.

X Filed Traded Ticker Insider Title Type Price Qty Owned ΔOwn Value
D 2026-08-18 17:04 2026-08-15 AMG FRANQUI ANNETTE Dir M - OptEx $0.00 +477 2,439 +24% $0
D 2026-08-18 17:04 2026-08-15 AMG FRANQUI ANNETTE Dir M - OptEx $0.00 -477 609 -44% $0

Purchase Sale Sale after option exercise All abbreviations

Every reported transaction

#TableSecurityDateCodeA/DSharesPriceOwned afterOwnExercise / expiryUnderlyingFootnotes
1 Common Common Stock 2026-08-15 M A 477 $0.00 2,439 D — — (F1) Reflects the vesting of a previously reported award. Award vested in 2026.
2 Derivative Stock Units 2026-08-15 M D 477 $0.00 609 D — · — to — 477 Common Stock (F1) Reflects the vesting of a previously reported award. Award vested in 2026. (F1) Reflects the vesting of a previously reported award. Award vested in 2026. (F1) Reflects the vesting of a previously reported award. Award vested in 2026.