Jay C. Horgen - 01 Jul 2025 Form 4 Insider Report for AFFILIATED MANAGERS GROUP, INC. (AMG)

Role: Chief Executive Officer, Director
Signature: /s/ Kavita Padiyar, Attorney-in-Fact
Issuer symbol: AMG
Transactions as of: 01 Jul 2025
Net transactions value: -$3,791,046
Form type: 4
Filing time: 03 Jul 2025, 14:10:45 UTC
Previous filing: 07 Mar 2025
Next filing: 14 Aug 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	03 Jul 2025	0001432993

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	AMG	Common Stock	Options Exercise	$5,586,750	+75,000	+17%	$74.49	516,120	01 Jul 2025	Direct
transaction	AMG	Common Stock	Tax liability	$9,377,796	-47,191	-9.1%	$198.72	468,929	01 Jul 2025	Direct
transaction	AMG	Common Stock	Gift	$0	-14,000	-3%	$0.000000	454,929	02 Jul 2025	Direct	F1
transaction	AMG	Common Stock	Gift	$0	+14,000	+70%	$0.000000	34,058	02 Jul 2025	By Family Trusts	F1

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	-75,000	-25%	$0.000000	225,000	01 Jul 2025	Common Stock	75,000	$74.49	Direct

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

Explanation of Responses:

Id	Content
F1	The reporting person transferred 14,000 shares to a family trust of which the reporting person and his spouse are trustees, and for which the reporting person and members of his immediate family are the beneficiaries.