Table of Contents Title of each class Trading Symbol(s) Name of each exchange on which registered Common Stock ($0.01 par value) AMG New York Stock Exchange 5.875% Junior Subordinated Notes due 2059 MGR New York Stock Exchange 4.750% Junior Subordinated Notes due 2060 MGRB New York Stock Exchange 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 Se ...