AMG appoints G. Staley Cates to board; Alvingham to retire; Horgen re-appointed President

AFFILIATED MANAGERS GROUP, INC.

G. Staley Cates appointed as independent director of AMG, effective April 1, 2026.
Karen L. Alvingham to retire from the Board of Directors, effective April 1, 2026.
Jay C. Horgen re-appointed as President of AMG, effective April 1, 2026, while continuing as CEO.
Cates served as Vice Chairman of Southeastern Asset Management from 2015 to 2024 and is a CFA.

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