John R. Erickson - Jan 1, 2023 Form 4 Insider Report for AFFILIATED MANAGERS GROUP, INC. (AMG)

Role: Head of Affiliate Engagement
Signature: /s/ David M. Billings, Attorney-in-Fact
Stock symbol: AMG
Transactions as of: Jan 1, 2023
Transactions value $: -$296,423
Form type: 4
Date filed: 1/4/2023, 04:44 PM
Previous filing: Aug 17, 2022
Next 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	+3.94K	+10.36%	$0.00	42K	Jan 1, 2023	Direct	F1
transaction	AMG	Common Stock	Tax liability	-$296K	-1.87K	-4.46%	$158.43	40.1K	Jan 1, 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	-3.94K	-25.09%	$0.00	11.8K	Jan 1, 2023	Common Stock	3.94K		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 previously reported awards. Awards vest 2020-2024.
F2	Reflects the automatic surrender of shares of common stock to the Company to satisfy tax withholding obligations related to the vesting of the awards described above.