SEC Filing Summary for AFFILIATED MANAGERS GROUP, INC.

Jay C. Horgen, Chief Executive Officer and Director of AFFILIATED MANAGERS GROUP, INC., reported a disposition of 4,000 shares of Common Stock on December 23, 2025. The transaction, coded as a gift (G), resulted in zero proceeds. This is further detailed by footnote F1, indicating the shares were gifted to a charitable donor-advised fund. Following this transaction, Mr. Horgen directly owns 510,387 shares. Additionally, the filing indicates indirect ownership of 34,058 shares of Common Stock held by family trusts.