SCHEDULE 13G 0001227099 XXXXXXXX LIVE Common Stock 02/14/2025 0001434524 ClearSign Technologies Corporation 185064102 8023 E. 63rd Place, Suite 101 Tulsa OK 74133 Rule 13d-1(c) John M Pasquesi X1 0.00 10989774.00 0.00 10989774.00 10989774.00 N 19.99 IN Otter Capital LLC CA 0.00 10989774.00 0.00 10989774.00 10989774.00 N 19.99 OO ClearSign Technologies Corporation 8023 E. 63rd Place, Suite 101 Tulsa, OK, 74133 John M Pasquesi and Otter Capital LLC are collectively referred to herein as the "Reporting Persons." Otter Capital LLC PO Box 620067 Woodside, CA 94062 John M Pasquesi is a citizen of the United States and Otter Capital LLC was formed in the State of California. Y As of February 14, 2025, Otter Capital LLC was the record owner of 8,434,774 shares of the Issuer's Common Stock and Private Warrants to purchase up to 6,633,315 shares of Common Stock. The Private Warrants will be exercisable at an exercise price of $1.05 per share and are currently exercisable and will expire 5 years from the date of issuance. Additionally, the Issuer may redeem the Private Warrants once they become exercisable upon 30 days' advance notice if the closing price of the common stock reported equals to or exceeds $2.275 for any 20 business days within a 30 consecutive business-day period, provided that they may only be redeemed if there is an effective registration statement covering the resale of the Private Warrant shares. The Issuer is prohibited from effecting an exercise of any Private Warrants to the extent that such exercise would result in the number of shares of common stock beneficially owned by Otter Capital LLC and its affiliates exceeding 19.99% of the total number of shares of common stock outstanding immediately after giving effect to the exercise. As such, Private Warrants to purchase up to 2,555,000 shares of Common Stock are exercisable as of February 14, 2025. Mr. Pasquesi, as the managing and sole member of Otter Capital LLC, has sole voting and dispositive power over the shares of Issuer's Common Stock held by Otter Capital LLC. Mr. Pasquesi: 19.99% and Otter Capital LLC: 19.99%. The foregoing percentages are calculated based on 52,418,782 shares of Common Stock represented to be outstanding by the Issuer on March 26, 2025, as reported in the Issuer's Form 10-K for the period ended December 31, 2024. 10,989,774 0 10,989,774 0 Y Y Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11. Exhibit I Pursuant to Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, the undersigned hereby agree that only one statement containing the information required on Schedule 13G need be filed with respect to ownership by each of the undersigned of the shares of Common Stock of ClearSign Technologies Corporation. This Agreement may be executed in any number of counterparts, each of which shall be deemed an original. Date: April 8, 2025 Otter Capital LLC By: /s/ John M. Pasquesi Name: John M. Pasquesi Title: Managing Member /s/ John M. Pasquesi John M. Pasquesi John M Pasquesi /s/ John M. Pasquesi 04/08/2025 Otter Capital LLC /s/ John M. Pasquesi 04/08/2025