X0306 4 2022-07-08 0001434524 ClearSign Technologies Corp CLIR 0001748409 HOFFMAN Robert Thurston Sr 8023 E. 63RD PLACE, SUITE 101 TULSA OK 74133 1 0 1 0 0001747304 clirSPV LLC 119 WARREN AVENUE, 3RD FLOOR SPRING LAKE NJ 07762 0 0 1 0 0001749087 GPclirSPV LLC 119 WARREN AVENUE, 3RD FLOOR SPRING LAKE NJ 07762 0 0 1 0 0001749086 Princeton Opportunity Management LLC 119 WARREN AVENUE, 3RD FLOOR SPRING LAKE NJ 07762 0 0 1 0 Common Stock (CLIR) 2022-07-08 4 P 0 1591594 1.11 A 7583234 I See Note Common Stock (CLIR) 2022-07-08 4 P 0 0 0 A 110519 I IRA Common Stock (CLIR) 2022-07-08 4 P 0 0 0 A 13153 D Note: Mr. Hoffman is the managing member of GPCLIRSPV LLC which is the managing member of CLIRSPV LLC, the owner of the common stock. Mr. Hoffman disclaims beneficial ownership of these shares except to the extent of his pecuniary interest in CLIRSPV LLC. clirSPV LLC has direct ownership of the 1,591,594 shares of Common Stock Purchased and total direct beneficial ownership of 7,459,562 shares of Common Stock. GPclirSPV, LLC has no direct ownership of the shares purchased and total indirect beneficial ownership of 7,459,562 shares of Common Stock Princeton Opportunity Management LLC has no direct ownership of shares purchased and total indirect beneficial ownership of 7,459,562 shares of Common Stock. Includes 110,519 shares held in an IRA previously reported as indirectly owned. /s/ Robert T. Hoffman Sr. 2022-07-12 /s/ Robert T. Hoffman Sr. (CLIRSPV LLC) 2022-07-12 /s/ Robert T. Hoffman Sr. (GPCLIRSPV LLC) 2022-07-12 /s/ Robert T. Hoffman Sr. (PRINCETON OPPORTUNITY MANAGEMENT LLC) 2022-07-12