Initial Statement of Beneficial Ownership (3)

FORM 3	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES	OMB APPROVAL OMB Number: 3235-0104 Estimated average burden hours per response... 0.5
	Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

1. Name and Address of Reporting Person * Erickson John R	2. Date of Event Requiring Statement (MM/DD/YYYY) 10/18/2021	3. Issuer Name and Ticker or Trading Symbol AFFILIATED MANAGERS GROUP, INC. [AMG]
(Last)        (First)        (Middle) C/O AFFILIATED MANAGERS GROUP, INC., 777 SOUTH FLAGLER DRIVE	4. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director                          _____ 10% Owner ___X___ Officer (give title below)        _____ Other (specify below) Head of Affiliate Engagement /
(Street) WEST PALM BEACH, FL 33401       (City)              (State)              (Zip)	5. If Amendment, Date Original Filed(MM/DD/YYYY)	6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	20717	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security (Instr. 4)	2. Date Exercisable and Expiration Date (MM/DD/YYYY)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Units	(1)	(1)	Common Stock	14149	$0	D

Explanation of Responses:
(1)	Reflects restricted stock units subject to vesting from 2022 to 2025 (4,434 in January 2022; 3,942 in January 2023; 1,897 in January 2024; and 969 in each of March 2022, 2023, 2024 and 2025).

Reporting Owners
Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Erickson John R C/O AFFILIATED MANAGERS GROUP, INC. 777 SOUTH FLAGLER DRIVE WEST PALM BEACH, FL 33401			Head of Affiliate Engagement

Signatures
/s/ David M. Billings, Attorney-in-Fact		10/28/2021
**Signature of Reporting Person		Date