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 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR ...