ClearSign Technologies Corp

FORM OF CERTIFICATE OF AMENDMENT OF CERTIFICATE OF INCORPORATION OF

CLEARSIGN TECHNOLOGIES CORPORATION

ClearSign Technologies Corporation (the “Corporation”), a corporation organized and existing under the General Corporation Law of the State of Delaware (“DGCL”), hereby certifies as follows:

“The total number of shares of capital stock that the Corporation shall have authority to issue is up to 89,500,000 shares, consisting of: (i) 87,500,000 shares of common stock, having a par value of $0.0001 per share (the “Common Stock”); and (ii) 2,000,000 shares of preferred stock, having a par value of $0.0001 per share (the “Preferred Stock”).”

IN WITNESS WHEREOF, the Corporation has caused this Certificate of Amendment to be signed by Colin James Deller, its Chief Executive Officer, this ___ day of ______ 2024.

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​CLEARSIGN TECHNOLOGIES CORPORATION ​

By: Colin James Deller

Title: Chief Executive Officer

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THIS PROXY CARD IS VALID ONLY WHEN SIGNED AND DATED. KEEP THIS PORTION FOR YOUR RECORDS DETACH AND RETURN THIS PORTION ONLY TO VOTE, MARK BLOCKS BELOW IN BLUE OR BLACK INK AS FOLLOWS: Signature [PLEASE SIGN WITHIN BOX] Date Signature (Joint Owners) Date SCAN TO VIEW MATERIALS & VOTE To withhold authority to vote for any individual nominee(s), mark “For All Except” and write the number(s) of the nominee(s) on the line below. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0000645799_1 R1.0.0.6 For Withhold For All All All Except The Board of Directors recommends you vote FOR the following: 1. Election of Directors Nominees 01) Robert T. Hoffman Sr. 02) Colin James Deller 03) Catharine M. de Lacy 04) Judith S. Schrecker 05) David M. Maley CLEARSIGN TECHNOLOGIES CORP 8023 E. 63RD PL. SUITE 101 TULSA, OK 74133 VOTE BY INTERNET - www.proxyvote.com or scan the QR Barcode above Use the Internet to transmit your voting instructions and for electronic delivery of information. Vote by 11:59 P.M. ET on 06/24/2024. Have your proxy card in hand when you access the web site and follow the instructions to obtain your records and to create an electronic voting instruction form. During The Meeting - Go to www.virtualshareholdermeeting.com/CLIR2024 You may attend the meeting via the Internet and vote during the meeting. Have the information that is printed in the box marked by the arrow available and follow the instructions. VOTE BY PHONE - 1-800-690-6903 Use any touch-tone telephone to transmit your voting instructions. Vote by 11:59 P.M. ET on 06/24/2024. Have your proxy card in hand when you call and then follow the instructions. VOTE BY MAIL Mark, sign and date your proxy card and return it in the postage-paid envelope we have provided or return it to Vote Processing, c/o Broadridge, 51 Mercedes Way, Edgewood, NY 11717. The Board of Directors recommends you vote FOR proposals 2, 3 and 4. For Against Abstain 2. Approve, on an advisory basis, the appointment of BPM CPA LLP as the Company's independent registered public accounting firm for the fiscal year ending December 31, 2024. 3. Approve an amendment to our Certificate of Incorporation to increase the number of authorized shares of our common stock to 87,500,000. 4. Approve, on an advisory basis, the compensation paid to the Company's named executive officers. The Board of Directors recommends you vote 3 YEARS on the following proposal: 1 year 2 years 3 years Abstain 5. Approve, on an advisory basis, the frequency of future advisory votes on executive compensation. The Board of Directors recommends you vote FOR the following proposal: For Against Abstain 6. Approve one or more adjournments of the Annual Meeting in certain circumstances. Please sign exactly as your name(s) appear(s) hereon. When signing as attorney, executor, administrator, or other fiduciary, please give full title as such. Joint owners should each sign personally. All holders must sign. If a corporation or partnership, please sign in full corporate or partnership name by authorized officer.

0000645799_2 R1.0.0.6 Important Notice Regarding the Availability of Proxy Materials for the Annual Meeting: The Notice and Proxy Statement and Form 10-K are available at www.proxyvote.com CLEARSIGN TECHNOLOGIES CORP Annual Meeting of Stockholders June 25, 2024 1:00 PM Central Time This proxy is solicited by the Board of Directors The stockholder(s) hereby appoint(s) Colin James Deller and Brent Hinds, or either of them, as proxies, each with the power to appoint his substitute, and hereby authorize(s) them to represent and to vote, as designated on the reverse side of this ballot, all of the shares of common stock of CLEARSIGN TECHNOLOGIES CORP that the stockholder(s) is/are entitled to vote at the Annual Meeting of Stockholders to be held at 1:00 PM Central Time on June 25, 2024, at www.virtualshareholdermeeting.com/CLIR2024, and any adjournment or postponement thereof. This proxy, when properly executed, will be voted in the manner directed herein. If no such direction is made, this proxy will be voted in accordance with the Board of Directors’ recommendations. Continued and to be signed on reverse side