UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark One) ☐ 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: 0-11412 AMTECH SYSTEMS, INC. (Exact name of registrant as specified in its charter) Arizona 86-0411215 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification No.) 58 South River Drive Suite 370, Tempe, Arizona 85288 (Address of pr ...