Company: MGRE
Filing Date: 2025-02-28
Form Type: S-3ASR
Source: 0001193125-25-042543
Chunk: 20

Company: AFFILIATED MANAGERS GROUP, INC.
Filing Date: 2025-02-28
Form: S-3ASR
Chunk 20
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 Chief Financial Officer  |     |                     |

SIGNATURES AND POWERS OF ATTORNEY KNOW ALL PERSONS BY THESE PRESENTS, that we, the undersigned officers and directors of Affiliated Managers Group, Inc., a Delaware corporation, hereby severally constitute and appoint Jay C. Horgen, Dava E. Ritchea and Kavita Padiyar, and each of them singly, our true and lawful attorneys-in-factand agents, with power to act singly and with full power of substitution and resubstitution, to sign for us and in our names, in the capacities indicated below, the Registration Statement filed herewith and any and all amendments (including post-effective amendments) to said Registration Statement, and any registration statement filed pursuant to Rule 462 under the Securities Act of 1933, as amended, in connection with said Registration Statement, and to file or caused to be filed the same, with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, and generally to do all such things in our names and in our capacities as officers and directors to enable Affiliated Managers Group, Inc. to comply with the provisions of the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission, hereby ratifying and confirming our signatures as they may be signed by our said attorneys-in-factand agents, or any of them or their substitute or substitutes, to said Registration Statement and any and all amendments thereto and related registration statements. Pursuant to the requirements of the Securities Act of 1933, as amended, this Registration Statement has been signed by the following persons in the capacities and on the dates indicated.

| Signature                    
 /s/ Jay C. Horgen            
 Jay C. Horgen                
 /s/ Dava E. Ritchea          
 Dava E. Ritchea              |     | Title                                                                          
 President and Chief Executive Officer (Principal Executive Officer), Director  
 Chief Financial Officer (Principal Financial and Principal Accounting Officer) |     | Date              
 February 28, 2025 
 February 28, 2025 |
|:-----------------------------|:----|:-------------------------------------------------------------------------------|:----|:------------------|
| /s/ Karen L. Alvingham       
 Karen L. Alvingham           |     | Director                                                                       |     | February 28, 2025 |
| /s/ Dwight D. Churchill      
 Dwight D. Churchill          |     | Director                                                                       |     | February 28,