Company: MGRE
Filing Date: 2025-02-28
Form Type: S-3ASR
Source: 0001193125-25-042543
Chunk: 5

Company: AFFILIATED MANAGERS GROUP, INC.
Filing Date: 2025-02-28
Form: S-3ASR
Chunk 5
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 information incorporated by reference is a part of this prospectus, and information that we file later with the SEC will automatically update and supersede the information included and/or incorporated by reference in this prospectus. We incorporate by reference into this prospectus the documents listed below and any future filings made by us with the SEC under Sections 13(a), 13(c), 14, or 15(d) of the Exchange Act (other than, in each case, any document or portion of that document that is deemed not to be filed) after the initial filing of the registration statement that contains this prospectus and prior to the time that we sell all of the securities offered by this prospectus:

You may obtain documents incorporated by reference into this prospectus at no cost by requesting them in writing or telephoning us at the following address: Dava E. Ritchea, Chief Financial Officer Affiliated Managers Group, Inc. 777 South Flagler Drive West Palm Beach, Florida 33401 (800) 345-1100 This prospectus constitutes a part of a registration statement on Form S-3,including all amendments and exhibits, referred to herein as the “Registration Statement,” that we have filed with the SEC under the Securities Act of 1933, as amended, or the “Securities Act.” This prospectus does not contain all of the information contained in the Registration Statement. We refer you to the Registration Statement and related exhibits for further information regarding us and our securities. The Registration Statement may be inspected from the SEC’s website at http://www.sec.gov. Statements contained in this prospectus or in a document incorporated or deemed to be incorporated by reference herein concerning the provisions of any document filed as an exhibit to the Registration Statement are not necessarily complete and, in each instance, reference is made to the copy of such document filed as an exhibit to the Registration Statement or otherwise filed with the SEC. Each such statement is qualified in its entirety by such reference. 4

THE COMPANY

AMG is a strategic partner to leading independent investment firms globally. Our strategy is to generate long-term value by investing in
high-quality independent partner-owned firms, which we refer to as “Affiliates,” through a proven partnership approach, and allocating resources across our unique opportunity set to the areas of highest growth and return. With their
entrepreneurial, investment-centric cultures and alignment of interests with clients through direct equity ownership by firm principals, independent firms have fundamental competitive advantages in offering unique return streams to the marketplace.
Through AMG’s distinctive approach