UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ 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 Act of 1934 For the transition period from to Commission file number: 001-15725 ALPHA PRO TECH, LTD. (Exact Name of Registrant as Specified in Its Charter) Delaware 63-1009183 (State or Other Jurisdiction of Incorpora ...