Dava Ritchea - 05 Mar 2026 Form 4 Insider Report for AFFILIATED MANAGERS GROUP, INC. (AMG)

Role: Chief Financial Officer
Signature: /s/ Kavita Padiyar, Attorney-in-Fact
Issuer symbol: AMG
Transactions as of: 05 Mar 2026
Net transactions value: $0
Form type: 4
Filing time: 09 Mar 2026, 18:02:36 UTC
Previous filing: 07 Mar 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
RITCHEA DAVA	Chief Financial Officer	C/O AFFILIATED MANAGERS GROUP, INC., 777 SOUTH FLAGLER DRIVE, WEST PALM BEACH	/s/ Kavita Padiyar, Attorney-in-Fact	09 Mar 2026	0001840457

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	AMG	Common Stock	Options Exercise		+601		$0.000000^*	601	05 Mar 2026	Direct	F1
transaction	AMG	Common Stock	Tax liability		-292	-49%	$299.18^*	309	05 Mar 2026	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		-601	-25%	$0.000000^*	1,804	05 Mar 2026	Common Stock	601		Direct	F1
transaction	AMG	Stock Units	Award		+1,667		$0.000000^*	1,667	05 Mar 2026	Common Stock	1,667		Direct	F3

* 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. Award vests 2026-2029.
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.
F3	The award, issued under the Company's 2020 Equity Incentive Plan, vests in four equal installments on each of March 5, 2027, 2028, 2029, and 2030.