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

Role: Head of Affiliate Engagement
Signature: /s/ Kavita Padiyar, Attorney-in-Fact
Issuer symbol: AMG
Transactions as of: 15 Aug 2023
Net transactions value: -$684,491
Form type: 4
Filing time: 17 Aug 2023, 17:02:19 UTC
Previous filing: 07 Mar 2023
SEC: View on sec.gov

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	AMG	Common Stock	Options Exercise	$0	+10,964	+21%	$0.000000	63,199	15 Aug 2023	Direct	F1
transaction	AMG	Common Stock	Tax liability	$684,491	-5,145	-8.1%	$133.04	58,054	15 Aug 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	-10,964	-100%	$0.000000^*	0	15 Aug 2023	Common Stock	10,964		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.