    <SEC-DOCUMENT>0001004434-25-000024-index.html : 20250411
    <SEC-HEADER>0001004434-25-000024.hdr.sgml : 20250411
    <ACCEPTANCE-DATETIME>20250411164353
    ACCESSION NUMBER:		0001004434-25-000024
    CONFORMED SUBMISSION TYPE:	DEFA14A
    PUBLIC DOCUMENT COUNT:		3
    FILED AS OF DATE:		20250411
    DATE AS OF CHANGE:		20250411

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			AFFILIATED MANAGERS GROUP, INC.
    		CENTRAL INDEX KEY:			0001004434
    		STANDARD INDUSTRIAL CLASSIFICATION:	INVESTMENT ADVICE [6282]
    		ORGANIZATION NAME:           	02 Finance
    		EIN:				043218510
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		DEFA14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-13459
    		FILM NUMBER:		25832744

    	BUSINESS ADDRESS:
    		STREET 1:		777 SOUTH FLAGLER DRIVE
    		STREET 2:		SUITE 1401 EAST TOWER
    		CITY:			WEST PALM BEACH
    		STATE:			FL
    		ZIP:			33401
    		BUSINESS PHONE:		(800) 345-1100

    	MAIL ADDRESS:
    		STREET 1:		777 SOUTH FLAGLER DRIVE
    		STREET 2:		SUITE 1401 EAST TOWER
    		CITY:			WEST PALM BEACH
    		STATE:			FL
    		ZIP:			33401

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	AFFILIATED MANAGERS GROUP INC
    		DATE OF NAME CHANGE:	19970822
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEFA14A
    <SEQUENCE>1
    <FILENAME>a2025amgdefa14a.htm
    <DESCRIPTION>DEFA14A
    <TEXT>
    Document 1 - file: a2025amgdefa14a.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>affiliatedmanagersgroupincb.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 2 - file: affiliatedmanagersgroupincb.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>affiliatedmanagersgroupincc.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: affiliatedmanagersgroupincc.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>