Table of Contents ________________________________ Title of each class Trading Symbol(s) Name of each exchange on which registered Common Stock No Par Value AMS NYSE AMERICAN UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 ________________________________ FORM 10-K (Mark One) ý ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 2019 or ¨ TRANSITION REPORT PURSUANT To SECTION 13 or 15(D) OF THE SECURITIES EXCHANGE ...