Jay C. Horgen - Aug 12, 2025 Form 4 Insider Report for AFFILIATED MANAGERS GROUP, INC. (AMG)

Role: Chief Executive Officer, Director
Signature: /s/ Kavita Padiyar, Attorney-in-Fact
Stock symbol: AMG
Transactions as of: Aug 12, 2025
Transactions value $: -$4,433,108
Form type: 4
Date filed: 8/14/2025, 05:00 PM
Previous filing: Jul 3, 2025
Next filing: Sep 4, 2025
SEC: View on sec.gov

Reporting Owners (1)

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	2025-08-14	0001432993

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	AMG	Common Stock	Options Exercise	$5.59M	+75K	+16.49%	$74.49	530K	Aug 12, 2025	Direct
transaction	AMG	Common Stock	Tax liability	-$10M	-45.6K	-8.61%	$219.70	484K	Aug 12, 2025	Direct
holding	AMG	Common Stock						34.1K	Aug 12, 2025	By Family Trusts

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

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	-75K	-33.33%	$0.00	150K	Aug 12, 2025	Common Stock	75K	$74.49	Direct

* An asterisk sign (*) next to the price indicates that the price is likely invalid.