John R. Erickson - Aug 15, 2023 Form 4 Insider Report for AFFILIATED MANAGERS GROUP, INC. (AMG)

Role: Head of Affiliate Engagement
Signature: /s/ Kavita Padiyar, Attorney-in-Fact
Stock symbol: AMG
Transactions as of: Aug 15, 2023
Transactions value $: -$684,491
Form type: 4
Date filed: 8/17/2023, 05:02 PM
Previous filing: Mar 7, 2023

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	AMG	Common Stock	Options Exercise	$0	+11K	+20.99%	$0.00	63.2K	Aug 15, 2023	Direct	F1
transaction	AMG	Common Stock	Tax liability	-$684K	-5.15K	-8.14%	$133.04	58.1K	Aug 15, 2023	Direct	F2

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	Stock Units	Options Exercise	$0	-11K	-100%	$0.00^*	0	Aug 15, 2023	Common Stock	11K		Direct	F1

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

Explanation of Responses:

Id	Content
F1	Reflects the vesting of a previously reported award. The award vested on August 15, 2023.
F2	Reflects the automatic surrender of shares of common stock to the Company to satisfy tax withholding obligations related to the vesting of the award described above.