X0609 4 2026-04-23 0 0001434524 ClearSign Technologies Corp CLIR 0002028266 Silva Gil Todd false 8023 E. 63RD PLACE, SUITE 101 TULSA OK 74133 1 0 0 0 0 Common Stock 2026-04-23 4 P 0 1000 5.319 A 5000 D Common Stock 2026-04-23 4 P 0 1000 5.25 A 6000 D Represents the reporting person's two separate, open-market purchases of 1,000 shares of common stock of the issuer on April 23, 2026, at a price of $5.319 and $5.25 per share, respectively. /s/ G. Todd Silva 2026-04-27