| --- | --- | |-------|---------------------------------------------------------------------------------| | | 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 001-36509 AMPHASTAR ...