Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q (Mark One) QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE ☒ SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2024 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE ☐ SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 001-13459 AFFILIATED MANAGERS GROUP, INC. (Exact name of registrant as specified in its charter) Delaware 04-3218510 ...