FORM 10-K Delaware 83-1739858 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification Number) Title of each class Trading Symbol(s) Name of each exchange on which registered Common stock, par value $0.0001 per share ATER The Nasdaq Stock Market LLC Non-accelerated filer ☒ Smaller reporting company ☒ Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURI ...