ClearSign Technologies (CLIR) - 2021 Q4 - Annual Report

Table of Contents Title of each class Trading Symbol(s) Name of each exchange on which registered Common Stock CLIR The Nasdaq Stock Market LLC 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 SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from ______________ to _ ...