8-K - CLIR - Equibles

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of report (Date of earliest event reported):May 22, 2025

CLEARSIGN TECHNOLOGIES CORPORATION

(Exact name of registrant as specified in charter)

Delaware	001-35521	26-2056298
(State or other jurisdiction of incorporation)	(Commission File Number)	(IRS Employer Identification No.)

8023 E. 63rd Place, Suite 101

Tulsa**,Oklahoma 74133**

(Address of Principal Executive Offices)

(Zip Code)

(918) 236-6461

(Registrant's telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the Registrant under any of the following provisions (see General Instruction A.2 below).

¨	Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
¨	Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR240.14a-12)
---	---
¨	Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)).
---	---
¨	Pre-commencement communications pursuant to Rule 13e-4(c) under the<br>Exchange Act (17 CFR 240.13(e)-4(c))
---	---

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock	CLIR	The Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth<br> company ¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Item 1.01. Entry into a Material DefinitiveAgreement.

On May 22, 2025 (the “Effective Date”), ClearSign Technologies Corporation (the “Company”) entered into a cooperation agreement (the “Clarkson Cooperation Agreement”) with Richard D. Clarkson (collectively with his affiliates and associates, the “Clarkson Parties”) and a cooperation agreement (the “DiGiandomenico Cooperation Agreement” and, together with the Clarkson Cooperation Agreement, the “Cooperation Agreements”) with Anthony DiGiandomenico (collectively with his affiliates and associates, the “DiGiandomenico Parties”).

Pursuant to the Cooperation Agreements, the Clarkson Parties, in connection with the Clarkson Cooperation Agreement, and the DiGiandomenico Parties, in connection with the DiGiandomenico Cooperation Agreement, each, among other things, (a) acknowledged the irrevocable withdrawal of letters they previously delivered to the Company purporting to notify the Company of intent to nominate a director for election to the Company’s board of directors (the “Board”) at the Company’s 2025 annual meeting of stockholders (the “2025 Annual Meeting”), and (b) agreed to irrevocably withdraw all outstanding materials and purported notices submitted to the Company, and cease all solicitation efforts and other activities, in connection with or related thereto.

Pursuant to the Cooperation Agreements, the Company has agreed to take all necessary actions to increase the size of the Board from five to seven directors, appoint Louis J. Basenese and Anthony DiGiandomenico (each, a “New Director” and together, the “New Directors”) to the Board, and nominate each New Director as a candidate for election to the Board at the 2025 Annual Meeting.

From the Effective Date until the earlier of (x) the date immediately following the conclusion of the Company’s 2026 annual meeting of stockholders and (y) the occurrence of a Change of Control transaction (as defined in the Cooperation Agreements) (together, such term lengths of the Cooperation Agreements, the “Term”), the Clarkson Parties and the DiGiandomenico Parties have agreed to vote all Voting Securities (as defined in the Cooperation Agreements) beneficially owned by them at all meetings of the Company’s stockholders, or to execute a consent with respect to such Voting Securities, in accordance with the Board’s recommendations on all proposals submitted to stockholders, except that the Clarkson Parties and the DiGiandomenico Parties may vote in their discretion on any proposal of the Company in respect of any Extraordinary Transaction (as defined in the Cooperation Agreements). The Clarkson Parties and the DiGiandomenico Parties have also agreed to certain customary standstill provisions during the Term, prohibiting them from, among other things, (i) soliciting proxies, (ii) communicating with stockholders of the Company pursuant to Rule 14a-1(l)(2)(iv) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), (iii) taking public actions to change or influence the Board, management or the direction of certain Company matters, and (iv) acquiring an aggregate beneficial ownership of more than 3.5% of the outstanding shares of the Company’s common stock or Voting Securities.

During the Term, the Company and the Clarkson Parties and the DiGiandomenico Parties, as applicable, have agreed that they will not disparage each other and that they will not threaten, initiate, encourage or pursue, alone or in concert with others, or knowingly assist any other person to threaten, initiate, encourage or pursue, any lawsuit, claim, or proceeding with respect to any claims against the Company or a Clarkson Party or DiGiandomenico Party, as applicable, except for any legal proceeding initiated solely to remedy a breach of or to enforce the Cooperation Agreements. The Clarkson Parties and the DiGiandomenico Parties have also granted the Company a general release from any claims arising on or prior to the date of the applicable Cooperation Agreement, subject to limited exceptions.

The Company has agreed to pay, immediately following full payment of all fees and expenses incurred by the Special Committee to its advisors, an amount not to exceed in the aggregate $2,000 to Mr. Clarkson and an amount not to exceed in the aggregate $20,000 to Mr. DiGiandomenico in exchange for the general release and as reimbursement for reasonable, well-documented out-of-pocket fees and expenses incurred by Mr. Clarkson or Mr. DiGiandomenico, as applicable, in connection with the negotiation, execution and effectuation of the applicable Cooperation Agreement and the transactions contemplated by such Cooperation Agreement.

The foregoing descriptions of the Clarkson Cooperation Agreement and the DiGiandomenico Cooperation Agreement contained in this Current Report on Form 8-K do not purport to be complete and are qualified in their entirety by reference to the full terms and conditions of the Clarkson Cooperation Agreement and the DiGiandomenico Cooperation Agreement, which are filed with this Current Report on Form 8-K as Exhibit 10.1 and 10.2, respectively, and incorporated herein by reference.

Item 5.02. Departure of Directors orCertain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

Appointment of Directors and Increase to Board’sSize

On the Effective Date, the Board increased the size of the Board from five to seven directors and appointed each New Director as a member of the Board, effective immediately, for initial terms expiring at the 2025 Annual Meeting. Each New Director will receive the same compensation for his service as a director as the compensation received by other non-management directors on the Board, which compensation arrangements are described under the heading “Director Compensation Plan” in the Company’s annual report on Form 10-K filed with the Securities and Exchange Commission (the “SEC”) on March 31, 2025, as adjusted by the Board from time to time.

Concurrently with the appointment of the New Directors to the Board, the Board determined that Mr. Basenese qualifies as independent under the listing rules of the Nasdaq Stock Market LLC and appointed Mr. Basenese to the Human Capital and Compensation Committee (the “Compensation Committee”). Mr. DiGiandomenico was determined by the Board, in reliance on the determination of the Special Committee of the Board, to not be independent and has not been appointed to any committees of the Board.

Except for the Cooperation Agreements described in Item 1.01 above, there are no arrangements or understandings between either New Directors and any other person pursuant to which either New Director was selected as a director, or transactions in which either New Director has an interest requiring disclosure under Item 404(a) of Regulation S-K. There are no family relationships between either New Director and any of the Company’s officers and directors.

Mr. Basenese, age 47, brings over 25 years of experience with equity research and analysis, investment banking, strategic planning, thought leadership development and investor relations. Mr. Basenese has served as Executive Vice President – Market Strategy for Prairie Operating Co. (Nasdaq: PROP), a Houston-based publicly traded independent energy company engaged in the development and acquisition of oil and natural gas resources in the United States, since January 2025. He has also served as CEO and Chief Strategist of The Basenese Group, LLC, a full service equity research, strategy and advisory firm, since February 2005. Mr. Basenese has also served on the board of directors of ENDRA Life Sciences, Inc. (Nasdaq: NDRA), a life sciences company that develops technologies to improve the capabilities of clinical diagnostic ultrasound, since March 2020, and the board of directors of The Roberto Clemente Health Clinic, a U.S.-based non-profit that provides affordable access to high quality health care and wellness programs in the Tola coastal communities of Nicaragua to more than 12,000 patients per year, since April 2021. Prior to his current roles, Mr. Basenese served as President and Chief Market Strategist of MDB Capital Holdings, LLC (Nasdaq: MDBH), a broker-dealer and financial advisory firm based in Dallas, Texas, since October 2022. Prior to that role, he was the co-founder and served as Chief Analyst for Disruptive Tech Research, an independent equity research and advisory firm, from June 2014 to June 2023. Prior to that, he served in various analyst, strategist and account executive roles at Wall Street Daily, an affiliate of Agora, Inc., The Oxford Club, another affiliate of Agora, Inc., Morgan Stanley, Inc. and Commonwealth Risk. Mr. Basenese holds an MBA from the Crummer Graduate School of Business at Rollins College and a BA in English from the University of Florida.

Mr. DiGiandomenico, age 58, has been the Chief of Transactions and director of MDB Capital Holdings, LLC since inception on August 10, 2021. Mr. DiGiandomenico has also served on the board of directors of ENDRA Life Sciences Inc. (Nasdaq: NDRA), a developer of enhanced ultrasound technology, from July 2013 until present, the board of directors of Provention Bio, Inc., a developer of multiple drug therapies, from January 2017 until May 2020 and the board of directors of Cue Biopharma, Inc., a company that develops novel biologic drugs for the selective modulation of the human immune system to treat a broad range of cancers and autoimmune disorders from January 2016 to October 2019. Since he co-founded MDB Capital Holdings, LLC (formerly known as MDB Capital Group, LLC) in 1997, Mr. DiGiandomenico has been enabling investment into early-stage disruptive technologies. He has worked alongside a wide range of companies in biotechnology, medical devices, high technology, and renewable energy spaces. Mr. DiGiandomenico holds an MBA from the Haas School of Business at the University of California, Berkeley and a BS in Finance from the University of Colorado.

In connection with their appointment, each New Director received an offer letter from the Company, effective as of the Effective Date (each an “Offer Letter” and together, the “Offer Letters”), setting forth the terms of their services as directors and their compensation arrangement, which each New Director accepted. Pursuant to the Offer Letters and in accordance with the Company’s director compensation policies, each New Director will be eligible to receive restricted stock units (“RSUs”) under the Company’s 2021 Equity Incentive Plan on the first day of every quarter that such New Director serves on the Board (each, a “Grant Date”) in an amount of $15,000 for serving as a member of the Board and, with respect to Mr. Basenese, $750 for serving as a member of the Compensation Committee, payable on each Grant Date during each New Director’s term of service, with the value of the applicable RSUs determined at the applicable Grant Date. The initial grant amount of RSUs that each New Director will be eligible to receive upon each of their appointments will be pro-rated for the portion of the quarter ending June 30, 2025 during which each New Director serves on the Board. Mr. DiGiandomenico declined to accept the initial pro-rated grant of RSUs for the quarter ending June 30, 2025, that he was eligible to receive upon his appointment.

The foregoing description of the Offer Letters do not purport to be a complete description of the rights and obligations of the parties thereunder and is qualified in its entirety by reference to the Offer Letters, which are included as Exhibit 10.3 and Exhibit 10.4 to this Current Report on Form 8-K.

In connection with their appointments, each New Director will enter into the Company’s standard form of indemnification agreement, the form of which was filed as Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q filed with the SEC on August 14, 2023.

The information set forth in Item 1.01 of this Current Report on Form 8-K is incorporated into this Item 5.02 by reference.

Refusal of Director to Stand for Re-Election

On May 27, 2025, David M. Maley notified the Company that he will not stand for re-election as a director of the Company upon the expiration of his current term, which expires at the 2025 Annual Meeting. Mr. Maley currently serves as a member of the Board and the Board’s Audit and Risk Committee, Nominating and Corporate Governance Committee and Compensation Committee. Mr. Maley’s refusal to stand for re-election was not the result of any disagreement with the Company, known to an executive officer of the Company, on any matter relating to the Company’s operations, policies or practices. The Board has not yet determined whether it will reduce its size or nominate a replacement director at this time.

Item 7.01 Regulation FD Disclosure.

On May 27, 2025, the Company issued a press release announcing the actions described above. A copy of the press release is being furnished as Exhibit 99.1 to this Current Report on Form 8-K.

The information in this Item 7.01, including Exhibit 99.1, is being furnished pursuant to Item 7.01 of Form 8-K and shall not be deemed “filed” for purposes of Section 18 of the Exchange Act, or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference into any of the Company’s filings under the Securities Act of 1933, as amended, or the Exchange Act, whether made before or after the date hereof and regardless of any general incorporation language in such filings, except to the extent expressly set forth by specific reference in such a filing.

Item9.01. Financial Statements and Exhibits.

(d) Exhibits.

Exhibit No.	Description
10.1*	Cooperation Agreement, dated May 22, 2025, by and between ClearSign Technologies Corporation and Richard D. Clarkson.
10.2*	Cooperation Agreement, dated May 22, 2025, by and between ClearSign Technologies Corporation and Anthony DiGiandomenico.
10.3*	Louis J. Basenese’s Offer Letter, effective as of May 22, 2025.
10.4*	Anthony DiGiandomenico’s Offer Letter, effective as of May 22, 2025.
10.5**	Form of Indemnification Agreement (incorporated by reference to Exhibit 10.1 of the Quarterly Report on Form 10-Q filed with the SEC on August 14, 2023).
99.1***	Press Release, dated May 27, 2025.
104*	Cover Page Interactive Data File (embedded within the Inline XBRL document).

* Filed herewith.

** Previously filed.

*** Furnished herewith.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this Current Report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated: May 27, 2025

CLEARSIGN TECHNOLOGIES CORPORATION
By:	/s/ Colin James Deller
Name:	Colin James Deller
Title:	Chief Executive Officer

Exhibit 10.1

COOPERATION AGREEMENT

This Cooperation Agreement (this “Agreement”), effective as of May 22, 2025 (the “Effective Date”), is entered into by and between ClearSign Technologies Corporation, a Delaware corporation (“ClearSign”), and Richard D. Clarkson (collectively with his Affiliates and Associates, the “Investor Parties,” and each, an “Investor Party”). ClearSign and the Investor Parties are together referred to herein as the “Parties,” and each, a “Party.” Unless otherwise defined herein, capitalized terms shall have the meanings given to them in Section 16 hereof.

WHEREAS, on January 15, 2025 and February 25, 2025, the Investor Parties delivered letters to ClearSign pursuant to Article III, Section 3.2 of the Bylaws purporting to notify ClearSign of intent to nominate a director for election to the board of directors of ClearSign (the “Board”) at ClearSign’s 2025 annual meeting of stockholders (including, without limitation, any adjournments or postponements thereof and any meeting which may be called in lieu thereof) (the “2025 Annual Meeting”) (such letters, together, the “Clarkson Purported Notice”);

WHEREAS, on March 25, 2025, the Investor Parties notified ClearSign of the withdrawal of the Clarkson Purported Notice;

WHEREAS, the Investor Parties beneficially own an aggregate of 138,000 shares of ClearSign’s common stock, par value $0.0001 per share (the “Common Stock”), as of the Effective Date; and

WHEREAS, ClearSign has reached an agreement with the Investor Parties with respect to certain matters, as provided for in this Agreement.

NOW,THEREFORE, in consideration of the premises, representations and mutual covenants and agreements set forth herein, and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the Parties hereby agree as follows:

1.            Withdrawal of the Investor Parties’ Campaigns and Related Matters. Concurrently with and effective upon the execution of this Agreement, the Investor Parties (a) hereby acknowledge that the Clarkson Purported Notice was irrevocably withdrawn on March 25, 2025 and (b) shall irrevocably withdraw or cause the irrevocable withdrawal of any and all outstanding and yet to be withdrawn materials and notices submitted to ClearSign in connection with or related to the Clarkson Purported Notice, and shall take all necessary action to immediately cease any and all solicitation efforts and other activities in connection with the Clarkson Purported Notice and any and all related materials and notices (other than in connection with such withdrawal).

2.            Board Composition and Other Matters.

(a)            New Directors.

(i)            As soon as reasonably practicable following the Effective Date, the Board, and all applicable committees of the Board, shall take all necessary actions to: (A) increase the size of the Board from five (5) to seven (7) directors, and (B) appoint (x) Louis J. Basenese (the “First New Director”) to serve as a director, who shall fill one (1) of the newly created vacancies resulting from the increase in the size of the Board, and (y) Anthony DiGiandomenico (the “Second New Director” and, together with the First New Director, the “New Directors”) to serve as a director, who shall fill the other newly created vacancy resulting from the increase in the size of the Board.

(ii)           The Board, and all applicable committees of the Board, shall take all necessary actions to nominate each New Director as a candidate for election to the Board at the 2025 Annual Meeting. ClearSign shall recommend, support and solicit proxies for the election of each New Director at the 2025 Annual Meeting in the same manner as ClearSign has supported its nominees for election at prior annual meetings of stockholders at which the election of directors was uncontested.

(iii)          Prior to the appointment of the New Directors, (A) the Board has determined that the First New Director is an “Independent Director,” as defined in the listing rules of the Nasdaq Stock Market LLC (“Nasdaq”) and (B) the Special Committee of the Board has determined that the Second New Director is not an “Independent Director,” as defined in the listing rules of Nasdaq. In connection with the foregoing, and as a condition to ClearSign’s obligation to appoint each New Director to the Board, each New Director has (x) provided (1) such information required to be or is customarily disclosed by directors or director candidates in proxy statements or other filings under applicable law or stock exchange regulations, (2) such information reasonably requested by the Board in connection with assessing eligibility, independence and other criteria applicable to directors or satisfying compliance and legal obligations and (3) a fully completed and executed copy of ClearSign’s director candidate questionnaire (substantially in the form completed by ClearSign’s incumbent non-management directors), in each case, as promptly as practicable to, among other reasons, enable the timely filing of ClearSign’s proxy statement and other periodic reports with the U.S. Securities and Exchange Commission (the “SEC”), and (y) participated in (1) customary procedures for new director candidates, including, without limitation, an appropriate background check, comparable to those undergone by other non-management directors of ClearSign and (2) an interview with the Nominating and Corporate Governance Committee of the Board.

(b)           Committees. Following the appointment of the New Directors to the Board, the Board, and all applicable committees of the Board, shall take all necessary actions to appoint the New Directors to the Human Capital and Compensation Committee of the Board (the “Compensation Committee”), subject to each New Director meeting the applicable eligibility requirements for committee membership, including, without limitation, a determination by the Board, in its sole and unencumbered discretion, that such New Director is an “Independent Director” as defined in the listing rules of Nasdaq; provided, however, that the Board shall not be required to appoint a New Director to the Compensation Committee if the Board determines, or has determined, such New Director not to be an “Independent Director” as defined in the listing rules of Nasdaq; provided, further, that the Board is entitled to, and shall, rely on the finding and conclusion of the Special Committee of the Board which determines that the Second New Director is not an “Independent Director” as such term is defined in the listing rules of Nasdaq.

3.             Voting. From the Effective Date until the Termination Date (as defined below) (the “Standstill Period”), each Investor Party agrees that it will appear in person or by proxy at each annual or special meeting of stockholders of ClearSign (including, without limitation, any adjournments, postponements, reschedulings or continuations thereof and any meeting which may be called in lieu thereof), whether such meeting is held at a physical location or virtually by means of remote communications or a hybrid combination thereof, and will vote (or execute a consent with respect to) all Voting Securities beneficially owned by such Investor Party as of the applicable record date in accordance with the Board’s recommendations with respect to (a) the election, removal or replacement of any director, (b) the ratification of the appointment of ClearSign’s independent registered public accounting firm, (c) ClearSign’s “say-on-pay” proposal and (d) any other proposal to be submitted to the stockholders of ClearSign by either ClearSign or any stockholder of ClearSign; provided, however, that the Investor Parties shall be permitted to vote in their sole discretion on any proposal of ClearSign in respect of any Extraordinary Transaction. During the Standstill Period, each Investor Party agrees that it will not engage in any course of conduct with the purpose of causing stockholders of ClearSign to vote contrary to the recommendation of the Board on any of the aforementioned matters enumerated in subclauses (a)–(d) presented to ClearSign’s stockholders for their vote at any meeting of ClearSign’s stockholders or by written consent.

4.            Mutual Non-Disparagement.

(a)           Subject to Section 6 hereof, each Investor Party agrees that, during the Standstill Period, neither it nor any of its Representatives shall, and it shall cause each of its Representatives to not, directly or indirectly, in any capacity or manner, make, express, transmit, speak, write, verbalize or otherwise communicate in any way (or cause, further, assist, solicit, encourage, support or participate in any of the foregoing), any remark, comment, message, information, declaration, communication or other statement of any kind (including, without limitation, through the use of any social or professional networking websites and/or blogs), whether verbal, in writing, electronically transferred or otherwise, that might reasonably be construed to be derogatory or critical of, or negative toward, or constitute an adhominem attack on, or otherwise disparage, defame, damage, criticize, condemn or impugn the reputation or good name of ClearSign or any of its Representatives, former directors and officers, or any of their respective businesses, products, services, actions, writings, policies or practices.

(b)           ClearSign agrees that, during the Standstill Period, neither it nor any of its Representatives shall, and it shall cause each of its Representatives to not, directly or indirectly, in any capacity or manner, make, express, transmit, speak, write, verbalize or otherwise communicate in any way (or cause, further, assist, solicit, encourage, support or participate in any of the foregoing), any remark, comment, message, information, declaration, communication or other statement of any kind (including, without limitation, through the use of any social or professional networking websites and/or blogs), whether verbal, in writing, electronically transferred or otherwise, that might reasonably be construed to be derogatory or critical of, or negative toward, or constitute an ad hominem attack on, or otherwise disparage, defame, damage, criticize, condemn or impugn the reputation or good name of any Investor Party or any of their respective Representatives, or any of their respective businesses, products, services, actions, writings, policies or practices.

(c)           Notwithstanding the foregoing, nothing in this Section 4 or elsewhere in this Agreement shall prohibit any Party from making any factual statement or disclosure as may be required under the federal securities laws or other applicable laws (including, without limitation, to comply with the terms of any valid subpoena, order or other legal process from any governmental or regulatory authority with competent jurisdiction over the relevant Party), or stock exchange regulations; provided, however, that, unless prohibited under applicable law, such Party must provide written notice to the other Party at least two (2) business days prior to making any such statement or disclosure required under the federal securities laws or other applicable laws or stock exchange regulations that would otherwise be prohibited by the provisions of this Section 4, and reasonably consider any comments of such other Party.

(d)           The limitations set forth in Sections 4(a) and 4(b) hereof shall not prevent any Party from responding to any public statement made by the other Party of the nature described in Sections 4(a) and 4(b) hereof if such statement by the other Party was made in breach of this Agreement.

5.             No Litigation.

(a)           Each Investor Party covenants and agrees solely for and on behalf of itself that, during the Standstill Period, it shall not, and shall not permit any of its Representatives to (solely in the context of their representation of such Investor Party in connection with the subject matter of this Agreement), alone or in concert with others, threaten, initiate, encourage or pursue, or knowingly assist any other person to threaten, initiate, encourage or pursue, any lawsuit, claim or proceeding (including, without limitation, the Investor Parties commencing, encouraging or supporting any derivative or similar action in the name of ClearSign) before any court or governmental, administrative or regulatory body (collectively, “Legal Proceeding”) with respect to any Claims (as defined below) against ClearSign, except for any Legal Proceeding initiated solely to remedy a breach of or to enforce this Agreement; provided, however, that:

(i)            the foregoing shall not prevent (A) the Investor Parties or any of their respective Representatives (solely in the context of their representation of such Investor Party in connection with the subject matter of this Agreement), from responding to oral questions, interrogatories, requests for information or documents, subpoenas, civil investigative demands or similar processes (a “Legal Requirement”) in connection with any Legal Proceeding if such Legal Proceeding has not been initiated by, or on behalf of, or with the material assistance of, the Investor Parties or any of their Representatives (solely in the context of their representation of such Investor Party in connection with the subject matter of this Agreement) or (B) the exercise of statutory appraisal rights; provided, further, that, in the event that any of the Investor Parties or any of their Representatives receives such Legal Requirement, such Investor Party shall, unless prohibited by applicable law, give prompt written notice of such Legal Requirement to ClearSign; and

(ii)           this Section 5(a) shall not require any Investor Party to opt out of any class action lawsuits against ClearSign commenced and maintained by persons other than an Investor Party and its Affiliates unless such lawsuit was initiated in violation of this Section 5(a) (“Class Actions”) or the Investor Party is a party other than as a result of the Investor Parties’ ownership of Common Stock during the class period applicable to such Class Actions.

(b)           ClearSign covenants and agrees that, during the Standstill Period, it shall not, and shall not permit any of its Representatives to (solely in the context of their representation of ClearSign in connection with the subject matter of this Agreement), alone or in concert with others, threaten, initiate, encourage or pursue, or knowingly assist any other person to threaten, initiate, encourage or pursue, any Legal Proceedings with respect to any Claim against any of the Investor Parties, except for any Legal Proceeding initiated solely to remedy a breach of or to enforce this Agreement; provided, however, that the foregoing shall not prevent (A) ClearSign or any of its Representatives (solely in the context of their representation of ClearSign in connection with the subject matter of this Agreement), from responding to a Legal Requirement in connection with any Legal Proceeding if such Legal Proceeding has not been initiated by, or on behalf of, ClearSign or any of its Representatives (solely in the context of their representation of ClearSign in connection with the subject matter of this Agreement) or (B) the exercise of statutory appraisal rights; provided, further, that, in the event ClearSign or any of its Representatives receives such Legal Requirement, ClearSign shall, unless prohibited by applicable law, give prompt written notice of such Legal Requirement to the Investor Parties.

(c)           To the fullest extent permitted by law, the Investor Parties, on behalf of themselves and for all of their Affiliates, Associates, parent and subsidiary entities, joint ventures and partnerships, successors, assigns and the respective owners, officers, directors, partners, members, managers, principals, parents, subsidiaries, predecessor entities, agents, employees, stockholders, advisors, consultants, attorneys, heirs, executors, administrators, successors and assigns of any such person irrevocably, completely and unconditionally release, settle, acquit and forever discharge ClearSign and ClearSign’s Affiliates, Associates, parent and subsidiary entities, joint ventures and partnerships, successors, assigns, and their respective owners, officers, directors, partners, members, managers, principals, parents, subsidiaries, predecessor entities, agents, employees, stockholders, advisors, consultants, attorneys, heirs, executors, administrators, successors and assigns of any such person, jointly or severally, from any and all causes of action, claims, actions, rights, judgments, obligations, damages, amounts, demands, leases, controversies, suits, contentions, complaints, promises, accountings, bonds, bills, debts, liabilities, dues, sums of money, expenses, specialties and fees and costs (whether direct, indirect or consequential, incidental or otherwise including, without limitation, attorney’s fees or court costs, of whatever nature) incurred in connection therewith of any kind or nature whatsoever, foreseen, unforeseen, known or unknown, in their own right, representatively, derivatively or in any other capacity, in law or in equity or liabilities of whatever kind or character, arising under federal, state, foreign, or common law or the laws of any other relevant jurisdiction from the beginning of time to the date of this Agreement (the “Claims”) (such release by the Investor Parties, the “Release”); provided, however, that this release and waiver of the Claims shall not include claims to enforce the terms of this Agreement.

(d)           The Investor Parties hereby acknowledge that, as of the Effective Date, the Investor Parties may have claims against ClearSign that an Investor Party does not know or suspect to exist in its favor, including, without limitation, claims that, had they been known, might have affected the decision to enter into this Agreement, or to provide the Release. In connection with any such claims, other than any claims to enforce the terms of this Agreement, the Investor Parties agree that they intend to waive, relinquish and release any and all provisions, rights and benefits any state or territory of the United States or other jurisdiction that purports to limit the application of a release to unknown claims, or to facts unknown at the time the release was entered into, subject to the foregoing exclusions. In connection with this waiver, the Investor Parties acknowledge that they, or any of them, may (including, without limitation, after the Effective Date) discover facts in addition to or different from those known or believed by them to be true with respect to the subject matter of the Release, but it is the intention of the Investor Parties to completely, fully, finally and forever compromise, settle, release, discharge and extinguish any and all claims, other than excluded herein, that they may have against ClearSign, known or unknown, suspected or unsuspected, contingent or absolute, accrued or unaccrued, apparent or unapparent, that now exist or previously existed, without regard to the subsequent discovery of additional or different facts. The Investor Parties acknowledge that the foregoing waiver is a key, bargained for element to this Agreement and the Release that is part of it.

6.             Standstill.

(a)           During the Standstill Period, unless otherwise approved by the Board or by ClearSign, each Investor Party shall not, and shall cause its Representatives not to, directly or indirectly:

(i)            acquire, offer or seek to acquire, agree to acquire or acquire rights or options to acquire, whether by purchase, tender or exchange offer, through the acquisition of control of another person, by joining a group, through swap or hedging transactions or otherwise, (A) any securities of ClearSign, any rights decoupled from the underlying securities of ClearSign, or any derivative securities, contracts or instruments in any way related to the price of shares of Common Stock, in each case, if such acquisition, offer or seeking to acquire, agreement or transaction would result in any Investor Party having beneficial ownership of more than 3.5% of the Common Stock or Voting Securities outstanding at such time, including, without limitation, through the exercise of, or acquisition of, derivative securities or (B) any assets or liabilities of ClearSign;

(ii)           make any public announcement or proposal with respect to, or offer, seek, propose or indicate an interest in, (A) any form of business combination or acquisition or other transaction relating to a material amount of assets or securities of ClearSign or any of its subsidiaries, (B) any form of restructuring, recapitalization or similar transaction with respect to ClearSign or any of its subsidiaries or (C) any form of tender or exchange offer for Voting Securities, whether or not such transaction involves a Change of Control;

(iii)          in respect of those matters enumerated in Section 3 hereof, other than as may be required by reason of employment in a broker-dealer in the ordinary course, engage in, or assist in the engagement in (including, without limitation, engagement by use of or in coordination with a universal proxy card), any solicitation of proxies or written consents to vote any Voting Securities, communicate with stockholders of ClearSign pursuant to Rule 14a-1(l)(2)(iv) under the Securities Exchange Act of 1934, as amended, and the rules and regulations promulgated thereunder (the “Exchange Act”), or conduct, or assist in the conducting of, any type of binding or nonbinding referendum with respect to any Voting Securities, or assist or participate in any other way, directly or indirectly, in any solicitation of proxies (or written consents) with respect to, or from the holders of, any Voting Securities, or otherwise become a “participant” in a “solicitation,” as such terms are defined in Instruction 3 of Item 4 of Schedule 14A and Rule 14a-1 of Regulation 14A, respectively, under the Exchange Act, to vote any securities of ClearSign (including, without limitation, by initiating, encouraging or participating in any “withhold” or similar campaign);

(iv)          sell, offer or agree to sell directly or indirectly, through swap or hedging transactions or otherwise, any Voting Securities or any rights decoupled from the underlying securities held by any Investor Party to any person who is not (A) a Party to this Agreement, (B) a member of the Board, (C) an officer of ClearSign or (D) an Affiliate or Associate of any Party (any person not set forth in clauses (A) through (D) shall be referred to as a “Third Party”) with a known history of activism or known plans to engage in activism or that would knowingly (after due inquiry) result in such Third Party, collectively with its Affiliates, owning, controlling or otherwise having any beneficial or other ownership interest representing in the aggregate in excess of 4.9% of the shares of Common Stock outstanding at such time;

(v)           take any public action in support of or make any public proposal or request that constitutes or would result in: (A) advising, controlling, changing, replacing or influencing any director or member of management of ClearSign, including, without limitation, any plans or proposals, and/or consenting to the calling of any special meeting of stockholders to effect such plans or proposals, to change the number or term of directors or to fill any vacancies on the Board, except as set forth in this Agreement, (B) any material change in the capitalization, stock repurchase programs and practices or dividend policy of ClearSign, (C) any other material change in ClearSign’s management, business or corporate structure, (D) seeking to have ClearSign waive or make amendments or modifications to the Certificate of Incorporation, the Bylaws or the Policy Regarding Stockholder Candidates for Nomination (collectively, the “Governing Materials”) or any other actions that may impede or facilitate the acquisition of control of ClearSign by any person, (E) causing a class of securities of ClearSign to be delisted from, or to cease to be authorized to be quoted on, any securities exchange or (F) causing a class of securities of ClearSign to become eligible for termination of registration pursuant to Section 12(g)(4) of the Exchange Act;

(vi)          act by making public announcements or speaking to reporters or members of the media (whether “on the record” or on “background” or “off the record”), to seek to influence ClearSign’s stockholders, management or the Board with respect to ClearSign’s policies, operations, balance sheet, capital allocation, marketing approach, business configuration, Extraordinary Transactions or strategy or to obtain representation of the Board or seek the removal of any director in any manner, except as expressly permitted by this Agreement;

(vii)         call or seek to call, or request the call of, alone or in concert with others, any meeting of stockholders, whether or not such a meeting is permitted by the Governing Materials, including, without limitation, a “town hall meeting”;

(viii)        deposit any Voting Securities in any voting trust or subject any Voting Securities to any arrangement or agreement with respect to the voting of any Voting Securities (other than (A) any such voting trust, arrangement or agreement solely between the Investor Parties that is otherwise in accordance with this Agreement or (B) customary brokerage accounts, margin accounts, prime brokerage accounts and the like);

(ix)          seek, or knowingly encourage or advise any person, to submit nominations in furtherance of a “contested solicitation” for the election or removal of directors with respect to ClearSign or seek, or knowingly encourage or take any other action with respect to the election or removal of any directors of ClearSign;

(x)           form, join or in any other way participate in any “group” (within the meaning of Section 13(d)(3) of the Exchange Act) with respect to any of the Voting Securities; provided, however, that nothing herein shall limit the ability of an Affiliate of any Investor Party to join in a “group” with any other Investor Party or Affiliate thereof comprising such Investor Party following the execution of this Agreement, so long as any such Affiliate agrees in writing to be subject to, and bound by, the terms and conditions of this Agreement and, if required under the Exchange Act, files a Schedule 13D or an amendment thereof, as applicable, within two (2) business days after disclosing that such Investor Party has formed a group with such Affiliate;

(xi)          demand a copy of ClearSign’s list of stockholders or its other books and records or make any request pursuant to Rule 14a-7 under the Exchange Act or under any statutory or regulatory provisions of the State of Delaware providing for stockholder access to books and records (including, without limitation, lists of stockholders) of ClearSign;

(xii)         make any request or submit any proposal to amend or waive the terms of this Section 6 other than through non-public communications with ClearSign that would not be reasonably likely to trigger public disclosure obligations for any Party;

(xiii)        comment publicly about or disclose in a manner that could reasonably be expected to become public any intent, purpose, plan or proposal with respect to any transactions involving ClearSign, any director or member of management, policies, strategy, operations, financial results or affairs, any of its securities or assets, or this Agreement that is inconsistent with the provisions of this Agreement; or

(xiv)        enter into any discussions, negotiations, agreements or understandings with any person with respect to any action that the Investor Parties are prohibited from taking pursuant to this Section 6, or advise, assist, encourage or seek to persuade any person to take any action or make any statement with respect to any such action or otherwise take or cause any action or make any statement inconsistent with any of the foregoing.

(b)           Notwithstanding anything to the contrary contained in this Section 6, each Investor Party shall not be prohibited or restricted from: (A) communicating privately with members of the Board or senior officers of ClearSign regarding any matter in a manner consistent with communications that may be reasonably made by all stockholders of ClearSign, so long as such communications are not intended to, and would not reasonably be expected to, require any public disclosure of such communications by any Party or their respective Affiliates or any Third Party, subject in any case to any confidentiality obligations to ClearSign of any such director or officer and applicable law, rules or regulations; (B) taking any action necessary to comply with any law, rule or regulation or any action required by any governmental or regulatory authority or stock exchange that has, or may have, jurisdiction over such Investor Party; (C) generally fulfilling its obligations to its clients in its role as a broker-dealer or an employee of a broker-dealer, provided, that a breach by any Investor Party of this Agreement is not the cause of the applicable requirement; or (D) privately communicating with stockholders of ClearSign and others in a manner that does not otherwise violate this Agreement or applicable law, so long as such actions do not create a public disclosure obligation for such Investor Party or ClearSign and are undertaken on a basis reasonably designed to be confidential and in accordance in all material respects with such Investor Party’s normal practices in the circumstances. The provisions of this Section 6 shall not limit in any respect the actions of any director of ClearSign in his or her capacity as such, recognizing that such actions are subject to such director’s fiduciary duties to ClearSign and its stockholders and the Company Policies (it being understood and agreed that the Investor Parties shall not take any actions to indirectly violate any provision of this Section 6). The provisions of this Section 6 shall also not prevent the Investor Parties from freely voting their shares of Common Stock (except as otherwise provided in Section 3 hereof).

(c)           During the Standstill Period, each Investor Party shall refrain from taking any actions which could have the effect of encouraging, influencing or assisting any Third Party to engage in actions which, if taken by any Investor Party, would violate this Agreement, except as may be required by reason of employment in a broker-dealer in the ordinary course.

7.             Representations and Warranties of ClearSign. ClearSign represents and warrants to the Investor Parties that (a) ClearSign has the corporate power and authority to execute this Agreement and to bind it thereto, (b) this Agreement has been duly and validly authorized, executed and delivered by ClearSign, constitutes a valid and binding obligation and agreement of ClearSign, and is enforceable against ClearSign in accordance with its terms, except as enforcement thereof may be limited by applicable bankruptcy, insolvency, reorganization, moratorium, fraudulent conveyance or similar laws generally affecting the rights and remedies of creditors and subject to general equity principles and (c) the execution, delivery and performance of this Agreement by ClearSign does not and will not violate or conflict with (i) any law, rule, regulation, order, judgment or decree applicable to it or (ii) result in any breach or violation of or constitute a default (or an event which with notice or lapse of time or both could become a default) under or pursuant to, or result in the loss of a material benefit under, or give any right of termination, amendment, acceleration or cancellation of, any organizational document, or any material agreement, contract, commitment, understanding or arrangement to which ClearSign is a party or by which it is bound.

8.             Representations and Warranties of the Investor Parties. Each Investor Party jointly and severally represents and warrants to ClearSign that solely for and on behalf of itself that (a) this Agreement has been duly and validly authorized, executed and delivered by such Investor Party, and constitutes a valid and binding obligation and agreement of such Investor Party, and is enforceable against such Investor Party in accordance with its terms, except as enforcement thereof may be limited by applicable bankruptcy, insolvency, reorganization, moratorium, fraudulent conveyance or similar laws generally affecting the rights and remedies of creditors and subject to general equity principles, (b) the Investor Parties beneficially own an aggregate of 138,000 shares of Common Stock, (c) the signatory for such Investor Party has the power and authority to execute this Agreement and any other documents or agreements entered into in connection with this Agreement on behalf of himself and the applicable Investor Party, and to bind such Investor Party to the terms hereof and thereof, and to bind himself to the terms hereof and thereof, (d) the execution, delivery and performance of this Agreement by such Investor Party does not and will not violate or conflict with (i) any law, rule, regulation, order, judgment or decree applicable to it or (ii) result in any breach or violation of or constitute a default (or an event which with notice or lapse of time or both could become a default) under or pursuant to, or result in the loss of a material benefit under, or give any right of termination, amendment, acceleration, or cancellation of, any organizational document or any agreement, contract, commitment, understanding or arrangement to which such Investor Party is a party or by which it is bound, (e) the Investor Parties acknowledge that neither New Director is a stockholder designee or representative of the Investor Parties, and the Investor Parties shall not seek, and further acknowledges that they do not and will not have the right to receive, confidential information concerning ClearSign from either of the New Directors and (f) each Investor Party is not, nor will any Investor Parties become, party to any agreement, arrangement, commitment or understanding (whether written or oral) with either New Director with respect to his service as a director on the Board.

9.             SEC Filings.

(a)           ClearSign shall file with the SEC a Current Report on Form 8-K reporting its entry into this Agreement and appending this Agreement as an exhibit thereto (the “Form 8-K”). The Form 8-K shall be consistent with the terms of this Agreement. ClearSign shall provide the Investor Parties with a reasonable opportunity to review and comment on the Form 8-K prior to the filing of the Form 8-K with the SEC and consider in good faith any such comments of the Investor Parties.

(b)           The Investor Parties shall not make, and shall cause their respective Affiliates and Associates not to make, any public announcement or statement regarding this Agreement, without the prior written consent of ClearSign, except to the extent required by law or the rules of any national securities exchange.

10.           Term; Termination. The term of this Agreement shall commence on the Effective Date and shall continue until the earlier of (a) the date immediately following the conclusion of ClearSign’s 2026 annual meeting of stockholders (including, without limitation, any adjournments or postponements thereof and any meeting which may be called in lieu thereof) and (b) the occurrence of a Change of Control transaction (the “Termination Date”). Notwithstanding anything to the contrary contained in this Agreement, the provisions of Section 11 and Section 13 through Section 23 hereof shall survive the termination of this Agreement. The termination of this Agreement shall not relieve any Party from its responsibilities in respect of any breach of this Agreement prior to such termination.

11.           Expenses. Each Party shall be responsible for its own fees and expenses in connection with the negotiation, execution and effectuation of this Agreement and the transactions contemplated hereby. Notwithstanding the foregoing, immediately following full payment of all fees and expenses incurred by the Special Committee of the Board to its advisors, ClearSign shall pay to Mr. Clarkson an amount not to exceed in the aggregate $2,000.00 (a) in exchange for the Release and (b) as reimbursement for his reasonable, well-documented out-of-pocket fees and expenses incurred in connection with the negotiation, execution and effectuation of this Agreement and the transactions contemplated hereby.

12.           No Other Discussions or Arrangements. The Investor Parties represent and warrant that, as of the date of this Agreement, except as described herein, specifically disclosed to ClearSign in writing prior to the Effective Date and/or are reflected on the books and records of ClearSign, (a) the Investor Parties do not own, of record or beneficially, any Voting Securities or any securities convertible into, or exchangeable or exercisable for, any Voting Securities, (b) the Investor Parties have not entered into, directly or indirectly, any agreements or understandings with any person (other than their own Representatives) with respect to any potential transaction involving ClearSign or the voting or disposition of any securities of ClearSign and (c) no Investor Party is a member of or a participant in a “group” (within the meaning of Section 13(d)(3) of the Exchange Act) with respect to any Voting Securities as of the Effective Date.

13.           Governing Law; Jurisdiction. This Agreement shall be governed by and construed in accordance with the internal laws of the State of Delaware without giving effect to any choice or conflict of law provision or rule that would cause the application of laws of any jurisdiction other than those of the State of Delaware. Each Party agrees that it shall bring any suit, action or other proceeding in respect of any claim arising out of or related to this Agreement (each, an “Action”) exclusively in (a) the Delaware Court of Chancery, (b) in the event (but only in the event) that such court does not have subject matter jurisdiction over such Action, the United States District Court for the District of Delaware or (c) in the event (but only in the event) that such courts identified in clauses (a) and (b) do not have subject matter jurisdiction over such Action, any other Delaware state court (collectively, the “Chosen Courts”), and, solely in connection with an Action brought in accordance with this provision, irrevocably (i) submits to the exclusive jurisdiction of the Chosen Courts, (ii) waives any jurisdictional defenses (including, without limitation, personal jurisdiction and venue) to any such Action in the Chosen Courts, (iii) waives any objection that the Chosen Courts are an inconvenient forum or do not have jurisdiction over any Party and (iv) agrees that service of process upon such Party in any such Action shall be effective if notice is given in accordance with Section 17 hereof. Each Party agrees that a final judgment in any Action brought in the Chosen Courts shall be conclusive and binding upon each Party and may be enforced in any other courts, the jurisdiction of which each Party is or may be subject, by suit upon such judgment.

14.           Waiver of Jury Trial. EACH PARTY HERETO ACKNOWLEDGES AND AGREES THAT ANY CONTROVERSY WHICH MAY ARISE UNDER THIS AGREEMENT IS LIKELY TO INVOLVE COMPLICATED AND DIFFICULT ISSUES AND, THEREFORE, EACH SUCH PARTY IRREVOCABLY AND UNCONDITIONALLY WAIVES TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW ANY RIGHT IT MAY HAVE TO A TRIAL BY JURY IN RESPECT OF ANY LEGAL ACTION ARISING OUT OF OR RELATING TO THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED BY THIS AGREEMENT. EACH PARTY TO THIS AGREEMENT CERTIFIES AND ACKNOWLEDGES THAT (A) NO REPRESENTATIVE OF ANY OTHER PARTY HAS REPRESENTED, EXPRESSLY OR OTHERWISE, THAT SUCH OTHER PARTY WOULD NOT SEEK TO ENFORCE THE FOREGOING WAIVER IN THE EVENT OF A LEGAL ACTION, (B) SUCH PARTY HAS CONSIDERED THE IMPLICATIONS OF THIS WAIVER, (C) SUCH PARTY MAKES THIS WAIVER VOLUNTARILY AND (D) SUCH PARTY HAS BEEN INDUCED TO ENTER INTO THIS AGREEMENT BY, AMONG OTHER THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS IN THIS SECTION 14.

15.           Specific Performance. Each Party acknowledges and agrees that irreparable injury to the other Parties would occur in the event any of the provisions of this Agreement are not performed in accordance with their specific terms or are otherwise breached and that such injury would not be adequately compensable by the remedies available at law (including, without limitation, the payment of money damages). It is accordingly agreed that each of the Parties (the “Moving Party”) shall be entitled to seek specific enforcement of, and injunctive or other equitable relief as a remedy for any such breach or to prevent any violation or threatened violation of, the terms hereof, and the other Parties will not take action, directly or indirectly, in opposition to the Moving Party seeking such relief on the grounds that any other remedy or relief is available at law or in equity. Each Party further agrees to waive any requirement for the security or posting of any bond in connection with any such relief. The remedies available pursuant to this Section 15 shall not be deemed to be the exclusive remedies for a breach of this Agreement but shall be in addition to all other remedies available at law or equity.

16.          Certain Definitions. As used in this Agreement:

(a)           “Affiliate” shall mean any “Affiliate” as defined in Rule 12b-2 promulgated by the SEC under the Exchange Act, including, without limitation, persons who become Affiliates subsequent to the Effective Date; provided, however, that, for purposes of this Agreement, no Investor Party shall be deemed an Affiliate of ClearSign, and ClearSign shall not be deemed an Affiliate of any Investor Party; provided, further, that the term Affiliate will not include any direct or indirect employees, consultants or agents of an Investor Party;

(b)           “Associate” shall mean any “Associate” as defined in Rule 12b-2 promulgated by the SEC under the Exchange Act, including, without limitation, persons who become Associates subsequent to the Effective Date;

(c)           “beneficialowner,” “beneficial ownership” and “beneficially own” shall have the same meanings as set forth in Rule 13d-3 promulgated by the SEC under the Exchange Act;

(d)           “businessday” shall mean any day other than a Saturday, Sunday or day on which the commercial banks in the State of New York are authorized or obligated to be closed by applicable law;

(e)           “Bylaws” shall mean ClearSign’s Bylaws, as filed with the SEC on June 15, 2023, as may be amended, corrected or amended and restated from time to time;

(f)            “Certificateof Incorporation” shall mean ClearSign’s Certificate of Incorporation, dated June 14, 2023, as amended on June 25, 2024, and as may be further amended, corrected or amended and restated from time to time;

(g)           a “Change of Control” shall be deemed to have taken place if (i) any person is or becomes a beneficial owner, directly or indirectly, of securities of ClearSign representing more than fifty percent (50%) of the equity interests and voting power of ClearSign’s then-outstanding equity securities or (ii) ClearSign enters into a stock-for-stock transaction whereby immediately after the consummation of the transaction ClearSign’s stockholders retain, directly or indirectly, less than fifty percent (50%) of the equity interests and voting power of the surviving entity’s then-outstanding equity securities;

(h)           “ExtraordinaryTransaction” shall mean any equity tender offer, equity exchange offer, merger, acquisition, joint venture, business combination, financing, restructuring, recapitalization, reorganization, disposition, distribution or other transaction with a Third Party that, in each case, would result in a Change of Control of ClearSign or liquidation or dissolution of its equity securities or a majority of its assets;

(i)            “person” or “persons” shall mean any individual, corporation (including, without limitation, not-for-profit), general or limited partnership, limited liability or unlimited liability company, joint venture, estate, trust, group, association, or other entity of any kind, structure or nature;

(j)            “Representative” shall mean a person’s Affiliates and Associates and its and their respective directors, officers, employees, partners, members, managers, consultants, legal or other advisors, agents and other representatives; provided, that, when used with respect to ClearSign, “Representative” shall not include any non-executive employees; and

(k)           “VotingSecurities” shall mean the Common Stock and any other securities of ClearSign entitled to vote in the election of directors.

17.           Notices. All notices, requests, consents, claims, demands, waivers and other communications hereunder shall be in writing and shall be deemed to have been given: (a) when delivered by hand (with written confirmation of receipt), (b) when received by the addressee if sent by a nationally recognized overnight courier (receipt requested), (c) on the date sent by email (with confirmation of transmission) if sent during normal business hours of ClearSign, and on the next business day if sent after normal business hours of ClearSign or (d) on the third day after the date mailed, by certified or registered mail, return receipt requested, postage prepaid. Such communications must be sent to the respective Parties at the addresses set forth in this Section 17 (or to such other address that may be designated by a Party from time to time in accordance with this Section 17).

If to ClearSign, to its address at:

ClearSign Technologies Corporation

8023 E. 63^rd^ Place, Suite 101

Tulsa, OK 74133

Attention: Jim Deller

with a copy (which shall not constitute notice) to:

Sullivan & Cromwell LLP

125 Broad Street

New York, NY 10004

Attention:

Email:

If to an Investor Party, to the address at:

18.           Entire Agreement; Amendment. This Agreement constitutes the sole and entire agreement of the Parties with respect to the subject matter contained herein, and it supersedes all prior and contemporaneous understandings, agreements, representations, and warranties, both written and oral, with respect to such subject matter. This Agreement may be amended, modified or supplemented only by an agreement in writing signed by each Party.

19.           Severability. If any term or provision of this Agreement is invalid, illegal or unenforceable in any jurisdiction, such invalidity, illegality or unenforceability shall not affect any other term or provision of this Agreement or invalidate or render unenforceable such term or provision in any other jurisdiction.

20.           Counterparts. This Agreement may be executed in counterparts, each of which shall be deemed an original, but all of which together shall be deemed to be one and the same agreement. A signed copy of this Agreement delivered by email or other means of electronic transmission shall be deemed to have the same legal effect as delivery of an original signed copy of this Agreement.

21.           Assignment. No Party may assign any of its rights or delegate any of its obligations hereunder without the prior written consent of the other Parties, provided, that each Party may assign any of its rights and delegate any of its obligations hereunder to any person that acquires substantially all of that Party’s assets, whether by stock sale, merger, asset sale or otherwise. Any purported assignment or delegation in violation of this Section 21 shall be null and void. No assignment or delegation shall relieve the assigning or delegating Party of any of its obligations hereunder. This Agreement is for the sole benefit of the Parties and their respective successors and permitted assigns and nothing herein, express or implied, is intended to or shall confer upon any other person any legal or equitable right, benefit or remedy of any nature whatsoever under or by reason of this Agreement.

22.           Waivers. No waiver by any Party of any of the provisions hereof shall be effective unless explicitly set forth in writing and signed by the Party so waiving. No waiver by any Party shall operate or be construed as a waiver in respect of any failure, breach or default not expressly identified by such written waiver, whether of a similar or different character, and whether occurring before or after that waiver. No failure to exercise, or delay in exercising, any right, remedy, power or privilege arising from this Agreement shall operate or be construed as a waiver thereof; nor shall any single or partial exercise of any right, remedy, power or privilege hereunder preclude any other or further exercise thereof or the exercise of any other right, remedy, power or privilege.

23.           Interpretation. Each Party hereby affirms that it has been represented by legal counsel of its choice throughout all negotiations that have preceded the execution of this Agreement and that it has executed the same with the advice of said counsel. Each Party hereby further affirms that it and its respective legal counsel cooperated and participated in the drafting and preparation of this Agreement and the documents referred to herein, and any and all drafts relating thereto exchanged among the Parties shall be deemed the work product of all Parties and may not be construed against any Party by reason of its drafting or preparation. Accordingly, any rule of law or any legal decision that would require interpretation of any ambiguities in this Agreement against any Party that drafted or prepared it is of no application and is expressly waived by each Party, and any controversy over interpretations of this Agreement shall be decided without regard to events of drafting or preparation. The headings set forth in this Agreement are for convenience of reference purposes only and shall not affect or be deemed to affect in any way the meaning or interpretation of this Agreement or any term or provision of this Agreement. In this Agreement, unless a clear contrary intention appears, (a) the word “including” (in its various forms) means “including, without limitation,” (b) the words “hereunder,” “hereof,” “hereto” and words of similar import are references to this Agreement as a whole and not to any particular provision of this Agreement, (c) the word “or” is not exclusive, (d) references to “Sections” in this Agreement are references to Sections of this Agreement unless otherwise indicated and (e) whenever the context requires, the masculine gender shall include the feminine and neutral genders.

[Remainder of Page Intentionally Left Blank]

INWITNESS WHEREOF, the Parties have executed this Agreement to be effective as of the Effective Date.

CLEARSIGN:
CLEARSIGN TECHNOLOGIES CORPORATION
By:	/s/ David M. Maley
Name:	David M. Maley
Title:	Director
INVESTOR PARTIES:
/s/ Richard D. Clarkson
Richard D. Clarkson

Signature Page to Cooperation Agreement

Exhibit 10.2

COOPERATION AGREEMENT

This Cooperation Agreement (this “Agreement”), effective as of May 22, 2025 (the “Effective Date”), is entered into by and between ClearSign Technologies Corporation, a Delaware corporation (“ClearSign”), and Anthony DiGiandomenico (collectively with his Affiliates and Associates, the “Investor Parties,” and each, an “Investor Party”). ClearSign and the Investor Parties are together referred to herein as the “Parties,” and each, a “Party.” Unless otherwise defined herein, capitalized terms shall have the meanings given to them in Section 16 hereof.

WHEREAS, on January 15, 2025, the Investor Parties delivered a letter to ClearSign pursuant to Article III, Section 3.2 of the Bylaws purporting to notify ClearSign of intent to nominate a director for election to the board of directors of ClearSign (the “Board”) at ClearSign’s 2025 annual meeting of stockholders (including, without limitation, any adjournments or postponements thereof and any meeting which may be called in lieu thereof ) (the “2025 Annual Meeting”) (such notice, the “Pre-NominationPeriod DiGiandomenico Notice”);

WHEREAS, the Investor Parties beneficially own an aggregate of 1,086,956 shares of ClearSign’s common stock, par value $0.0001 per share (the “CommonStock”), which includes 542,478 shares of Common Stock issuable upon the exercise of outstanding warrants, as of the Effective Date; and

WHEREAS, ClearSign has reached an agreement with the Investor Parties with respect to certain matters, as provided for in this Agreement.

NOW, THEREFORE, in consideration of the premises, representations and mutual covenants and agreements set forth herein, and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the Parties hereby agree as follows:

1.            Withdrawal of the Investor Parties’ Campaigns and Related Matters. Concurrently with and effective upon the execution of this Agreement, the (a) Investor Parties (i) hereby acknowledge that the Pre-Nomination Period DiGiandomenico Notice was delivered prior to February 25, 2025, the first date as defined by the Bylaws in which stockholders were permitted to submit notice of intent to nominate candidates for election to the Board in connection with the 2025 Annual Meeting and (ii) shall irrevocably withdraw or cause the irrevocable withdrawal of the Pre-Nomination Period DiGiandomenico Notice (with this Agreement deemed to evidence such withdrawal) and (b) Investor Parties shall irrevocably withdraw or cause the irrevocable withdrawal of any and all outstanding and yet to be withdrawn materials and notices submitted to ClearSign in connection with or related to the Pre-Nomination Period DiGiandomenico Notice, and shall take all necessary action to immediately cease any and all solicitation efforts and other activities in connection with the Pre-Nomination Period DiGiandomenico Notice and any and all related materials and notices (other than in connection with such withdrawal).

2.            Board Composition and Other Matters.

(a)            New Directors.

(i)            As soon as reasonably practicable following the Effective Date, the Board, and all applicable committees of the Board, shall take all necessary actions to: (A) increase the size of the Board from five (5) to seven (7) directors, and (B) appoint (x) Louis J. Basenese (the “First New Director”) to serve as a director, who shall fill one (1) of the newly created vacancies resulting from the increase in the size of the Board, and (y) Mr. DiGiandomenico (the “Second New Director” and, together with the First New Director, the “New Directors”) to serve as a director, who shall fill the other newly created vacancy resulting from the increase in the size of the Board.

(b)           Committees. Following the appointment of the New Directors to the Board, the Board, and all applicable committees of the Board, shall take all necessary actions to appoint the New Directors to the Human Capital and Compensation Committee of the Board, subject to each New Director meeting the applicable eligibility requirements for committee membership, including, without limitation, a determination by the Board, in its sole and unencumbered discretion, that such New Director is an “Independent Director” as defined in the listing rules of NASDAQ; provided, however, that the Board shall not be required to appoint a New Director to the Compensation Committee of the Board if the Board determines, or has determined, such New Director not to be an “Independent Director” as defined in the listing rules of NASDAQ; provided, further, that the Board is entitled to, and shall, rely on the finding and conclusion of the Special Committee of the Board which determines that the Second New Director is not an “independent director” as such term is defined in the listing rules of NASDAQ.

| 2 |

| --- |

(c)            Board Policies and Procedures. Each Party acknowledges that each New Director, upon his appointment to the Board and for so long as he is a member of the Board, shall be governed by all of the same policies, processes, procedures, codes, rules, standards and guidelines applicable to members of the Board, including, without limitation, ClearSign’s Code of Business Conduct and Ethics, Clawback Policy, Policy Regarding Stockholder Candidates for Nomination and any other policies on stock ownership, insider trading, anti-hedging, corporate governance, public disclosures and confidentiality (collectively, the “Company Policies”) and all applicable rules and regulations of Nasdaq, and will be required to strictly adhere to ClearSign’s policies on confidentiality imposed on all members of the Board. ClearSign agrees that, upon his appointment to the Board and for so long as he is a member of the Board, each New Director shall receive (i) the same benefits of director and officer insurance and any indemnity and exculpation arrangements as all other non-management directors on the Board, (ii) the same compensation for his service as a director as the compensation received by other non-management directors on the Board and (iii) such other benefits on the same basis as all other non-management directors on the Board. Notwithstanding anything to the contrary contained in this Agreement, ClearSign agrees that the Second New Director is a stockholder designee of the Investor Parties and, as a result, the Second New Director may provide confidential information of ClearSign to the Investor Parties that the Second New Director learns in his capacity as a member of the Board; provided, however, that, prior to the Second New Director providing any such confidential information to any Investor Party and as a condition precedent to such Investor Party requesting or receiving any such information, ClearSign and such Investor Party shall execute a customary confidentiality agreement, pursuant to which, among other things, such Investor Party (A) is informed of the confidential nature of the confidential information, (B) agrees that it will abstain from participating in any transaction involving or related to securities of ClearSign while in possession of material non-public information and (C) shall refrain from disclosing the confidential information to anyone, other than as set forth in such confidentiality agreement.

3.            Voting. From the Effective Date until the Termination Date (as defined below) (the “Standstill Period”), each Investor Party agrees that it will appear in person or by proxy at each annual or special meeting of stockholders of ClearSign (including, without limitation, any adjournments, postponements, reschedulings or continuations thereof and any meeting which may be called in lieu thereof), whether such meeting is held at a physical location or virtually by means of remote communications or a hybrid combination thereof, and will vote (or execute a consent with respect to) all Voting Securities beneficially owned by such Investor Party as of the applicable record date in accordance with the Board’s recommendations with respect to (a) the election, removal or replacement of any director, (b) the ratification of the appointment of ClearSign’s independent registered public accounting firm, (c) ClearSign’s “say-on-pay” proposal and (d) any other proposal to be submitted to the stockholders of ClearSign by either ClearSign or any stockholder of ClearSign; provided, however, that the Investor Parties shall be permitted to vote in their sole discretion on any proposal of ClearSign in respect of any Extraordinary Transaction. During the Standstill Period, each Investor Party agrees that it will not engage in any course of conduct with the purpose of causing stockholders of ClearSign to vote contrary to the recommendation of the Board on any of the aforementioned matters enumerated in subclauses (a)–(d) presented to ClearSign’s stockholders for their vote at any meeting of ClearSign’s stockholders or by written consent.

| 3 |

| --- |

4.            Mutual Non-Disparagement.

(c)            Notwithstanding the foregoing, nothing in this Section 4 or elsewhere in this Agreement shall prohibit any Party from making any factual statement or disclosure as may be required under the federal securities laws or other applicable laws (including, without limitation, to comply with the terms of any valid subpoena, order or other legal process from any governmental or regulatory authority with competent jurisdiction over the relevant Party), or stock exchange regulations; provided, however, that, unless prohibited under applicable law, such Party must provide written notice to the other Party at least two (2) business days prior to making any such statement or disclosure required under the federal securities laws or other applicable laws or stock exchange regulations that would otherwise be prohibited by the provisions of this Section 4, and reasonably consider any comments of such other Party.

| 4 |

| --- |

5.            No Litigation.

(a)            Each Investor Party covenants and agrees solely for and on behalf of itself that, during the Standstill Period, it shall not, and shall not permit any of its Representatives to (solely in the context of their representation of such Investor Party in connection with the subject matter of this Agreement), alone or in concert with others, threaten, initiate, encourage or pursue, or knowingly assist any other person to threaten, initiate, encourage or pursue, any lawsuit, claim or proceeding (including, without limitation, the Investor Parties commencing, encouraging or supporting any derivative or similar action in the name of ClearSign) before any court or governmental, administrative or regulatory body (collectively, “Legal Proceeding”) with respect to any Claims (as defined below) against ClearSign, except for any Legal Proceeding initiated solely to remedy a breach of or to enforce this Agreement; provided, however, that:

(i)             the foregoing shall not prevent (A) the Investor Parties or any of their respective Representatives (solely in the context of their representation of such Investor Party in connection with the subject matter of this Agreement), from responding to oral questions, interrogatories, requests for information or documents, subpoenas, civil investigative demands or similar processes (a “Legal Requirement”) in connection with any Legal Proceeding if such Legal Proceeding has not been initiated by, or on behalf of, or with the material assistance of, the Investor Parties or any of their Representatives (solely in the context of their representation of such Investor Party in connection with the subject matter of this Agreement) or (B) the exercise of statutory appraisal rights; provided, further, that, in the event that any of the Investor Parties or any of their Representatives receives such Legal Requirement, such Investor Party shall, unless prohibited by applicable law, give prompt written notice of such Legal Requirement to ClearSign; and

| 5 |

| --- |

(d)           The Investor Parties hereby acknowledge that, as of the Effective Date, the Investor Parties may have claims against ClearSign that an Investor Party does not know or suspect to exist in its favor, including, without limitation, claims that, had they been known, might have affected the decision to enter into this Agreement, or to provide the Release. In connection with any such claims, other than any claims to enforce the terms of this Agreement or the Investor Parties’ rights under various underwriting and offering agreements in connection with the public offering by ClearSign in April 2024 and February 2018, the Investor Parties agree that they intend to waive, relinquish and release any and all provisions, rights and benefits any state or territory of the United States or other jurisdiction that purports to limit the application of a release to unknown claims, or to facts unknown at the time the release was entered into, subject to the foregoing exclusions. In connection with this waiver, the Investor Parties acknowledge that they, or any of them, may (including, without limitation, after the Effective Date) discover facts in addition to or different from those known or believed by them to be true with respect to the subject matter of the Release, but it is the intention of the Investor Parties to completely, fully, finally and forever compromise, settle, release, discharge and extinguish any and all claims, other than excluded herein, that they may have against ClearSign, known or unknown, suspected or unsuspected, contingent or absolute, accrued or unaccrued, apparent or unapparent, that now exist or previously existed, without regard to the subsequent discovery of additional or different facts. The Investor Parties acknowledge that the foregoing waiver is a key, bargained for element to this Agreement and the Release that is part of it.

| 6 |

| --- |

6.            Standstill.

(a)            During the Standstill Period, unless otherwise approved by the Board or by ClearSign, each Investor Party shall not, and shall cause its Representatives not to, directly or indirectly:

| 7 |

| --- |

(iii)           in respect of those matters enumerated in Section 3 hereof, other than as may be required by reason of employment in a broker-dealer in the ordinary course, engage in, or assist in the engagement in (including, without limitation, engagement by use of or in coordination with a universal proxy card), any solicitation of proxies or written consents to vote any Voting Securities, communicate with stockholders of ClearSign pursuant to Rule 14a-1(l)(2)(iv) under the Securities Exchange Act of 1934, as amended, and the rules and regulations promulgated thereunder (the “Exchange Act”), or conduct, or assist in the conducting of, any type of binding or nonbinding referendum with respect to any Voting Securities, or assist or participate in any other way, directly or indirectly, in any solicitation of proxies (or written consents) with respect to, or from the holders of, any Voting Securities, or otherwise become a “participant” in a “solicitation,” as such terms are defined in Instruction 3 of Item 4 of Schedule 14A and Rule 14a-1 of Regulation 14A, respectively, under the Exchange Act, to vote any securities of ClearSign (including, without limitation, by initiating, encouraging or participating in any “withhold” or similar campaign);

| 8 |

| --- |

(ix)           seek, or knowingly encourage or advise any person, to submit nominations in furtherance of a “contested solicitation” for the election or removal of directors with respect to ClearSign or seek, or knowingly encourage or take any other action with respect to the election or removal of any directors of ClearSign;

(x)            form, join or in any other way participate in any “group” (within the meaning of Section 13(d)(3) of the Exchange Act) with respect to any of the Voting Securities; provided, however, that nothing herein shall limit the ability of an Affiliate of any Investor Party to join in a “group” with any other Investor Party or Affiliate thereof comprising such Investor Party following the execution of this Agreement, so long as any such Affiliate agrees in writing to be subject to, and bound by, the terms and conditions of this Agreement and, if required under the Exchange Act, files a Schedule 13D or an amendment thereof, as applicable, within two (2) business days after disclosing that such Investor Party has formed a group with such Affiliate;

(xii)          make any request or submit any proposal to amend or waive the terms of this Section 6 other than through non-public communications with ClearSign that would not be reasonably likely to trigger public disclosure obligations for any Party;

| 9 |

| --- |

(xiii)         comment publicly about or disclose in a manner that could reasonably be expected to become public any intent, purpose, plan or proposal with respect to any transactions involving ClearSign, any director or member of management, policies, strategy, operations, financial results or affairs, any of its securities or assets, or this Agreement that is inconsistent with the provisions of this Agreement; or

(xiv)         enter into any discussions, negotiations, agreements or understandings with any person with respect to any action that the Investor Parties are prohibited from taking pursuant to this Section 6, or advise, assist, encourage or seek to persuade any person to take any action or make any statement with respect to any such action or otherwise take or cause any action or make any statement inconsistent with any of the foregoing.

(b)            Notwithstanding anything to the contrary contained in this Section 6, each Investor Party shall not be prohibited or restricted from: (A) communicating privately with members of the Board or senior officers of ClearSign regarding any matter in a manner consistent with communications that may be reasonably made by all stockholders of ClearSign, so long as such communications are not intended to, and would not reasonably be expected to, require any public disclosure of such communications by any Party or their respective Affiliates or any Third Party, subject in any case to any confidentiality obligations to ClearSign of any such director or officer and applicable law, rules or regulations; (B) taking any action necessary to comply with any law, rule or regulation or any action required by any governmental or regulatory authority or stock exchange that has, or may have, jurisdiction over such Investor Party; (C) generally fulfilling its obligations to its clients in its role as a broker-dealer or an employee of a broker-dealer, provided, that a breach by any Investor Party of this Agreement is not the cause of the applicable requirement; or (D) privately communicating with stockholders of ClearSign and others in a manner that does not otherwise violate this Agreement or applicable law, so long as such actions do not create a public disclosure obligation for such Investor Party or ClearSign and are undertaken on a basis reasonably designed to be confidential and in accordance in all material respects with such Investor Party’s normal practices in the circumstances. The provisions of this Section 6 shall not limit in any respect the actions of any director of ClearSign in his or her capacity as such, recognizing that such actions are subject to such director’s fiduciary duties to ClearSign and its stockholders and the Company Policies (it being understood and agreed that the Investor Parties shall not take any actions to indirectly violate any provision of this Section 6). The provisions of this Section 6 shall also not prevent the Investor Parties from freely voting their shares of Common Stock (except as otherwise provided in Section 3 hereof).

(c)            During the Standstill Period, each Investor Party shall refrain from taking any actions which could have the effect of encouraging, influencing or assisting any Third Party to engage in actions which, if taken by any Investor Party, would violate this Agreement, except as may be required by reason of employment in a broker-dealer in the ordinary course.

| 10 |

| --- |

7.            Representations and Warranties of ClearSign. ClearSign represents and warrants to the Investor Parties that (a) ClearSign has the corporate power and authority to execute this Agreement and to bind it thereto, (b) this Agreement has been duly and validly authorized, executed and delivered by ClearSign, constitutes a valid and binding obligation and agreement of ClearSign, and is enforceable against ClearSign in accordance with its terms, except as enforcement thereof may be limited by applicable bankruptcy, insolvency, reorganization, moratorium, fraudulent conveyance or similar laws generally affecting the rights and remedies of creditors and subject to general equity principles and (c) the execution, delivery and performance of this Agreement by ClearSign does not and will not violate or conflict with (i) any law, rule, regulation, order, judgment or decree applicable to it or (ii) result in any breach or violation of or constitute a default (or an event which with notice or lapse of time or both could become a default) under or pursuant to, or result in the loss of a material benefit under, or give any right of termination, amendment, acceleration or cancellation of, any organizational document, or any material agreement, contract, commitment, understanding or arrangement to which ClearSign is a party or by which it is bound.

8.            Representations and Warranties of the Investor Parties. Each Investor Party jointly and severally represents and warrants to ClearSign that solely for and on behalf of itself that (a) this Agreement has been duly and validly authorized, executed and delivered by such Investor Party, and constitutes a valid and binding obligation and agreement of such Investor Party, and is enforceable against such Investor Party in accordance with its terms, except as enforcement thereof may be limited by applicable bankruptcy, insolvency, reorganization, moratorium, fraudulent conveyance or similar laws generally affecting the rights and remedies of creditors and subject to general equity principles, (b) the Investor Parties beneficially own an aggregate of 1,086,956 shares of Common Stock (which includes 542,478 shares of Common Stock issuable upon the exercise of outstanding warrants), (c) the signatory for such Investor Party has the power and authority to execute this Agreement and any other documents or agreements entered into in connection with this Agreement on behalf of himself and the applicable Investor Party, and to bind such Investor Party the terms hereof and thereof, and to bind himself to the terms hereof and thereof, (d) the execution, delivery and performance of this Agreement by such Investor Party does not and will not violate or conflict with (i) any law, rule, regulation, order, judgment or decree applicable to it or (ii) result in any breach or violation of or constitute a default (or an event which with notice or lapse of time or both could become a default) under or pursuant to, or result in the loss of a material benefit under, or give any right of termination, amendment, acceleration, or cancellation of, any organizational document or any agreement, contract, commitment, understanding or arrangement to which such Investor Party is a party or by which it is bound, (e) the Investor Parties acknowledge that the First New Director is not a stockholder designee or representative of the Investor Parties, and the Investor Parties shall not seek, and further acknowledges that they do not and will not have the right to receive, confidential information concerning ClearSign from the First New Director and (f) each Investor Party is not, nor will any Investor Parties become, party to any agreement, arrangement, commitment or understanding (whether written or oral) with either New Director with respect to his service as a director on the Board.

| 11 |

| --- |

9.            SEC Filings.

(a)            ClearSign shall file with the SEC a Current Report on Form 8-K reporting its entry into this Agreement and appending this Agreement as an exhibit thereto (the “Form 8-K”). The Form 8-K shall be consistent with the terms of this Agreement. ClearSign shall provide the Investor Parties with a reasonable opportunity to review and comment on the Form 8-K prior to the filing of the Form 8-K with the SEC and consider in good faith any such comments of the Investor Parties.

10.          Term; Termination. The term of this Agreement shall commence on the Effective Date and shall continue until the earlier of (a) the date immediately following the conclusion of ClearSign’s 2026 annual meeting of stockholders (including, without limitation, any adjournments or postponements thereof and any meeting which may be called in lieu thereof) and (b) the occurrence of a Change of Control transaction (the “Termination Date”). Notwithstanding anything to the contrary contained in this Agreement, the provisions of Section 11 and Section 13 through Section 23 hereof shall survive the termination of this Agreement. The termination of this Agreement shall not relieve any Party from its responsibilities in respect of any breach of this Agreement prior to such termination.

11.          Expenses. Each Party shall be responsible for its own fees and expenses in connection with the negotiation, execution and effectuation of this Agreement and the transactions contemplated hereby. Notwithstanding the foregoing, immediately following full payment of all fees and expenses incurred by the Special Committee of the Board to its advisors, ClearSign shall pay to Mr. DiGiandomenico an amount not to exceed in the aggregate $20,000 (a) in exchange for the Release and (b) as reimbursement for his reasonable, well-documented out-of-pocket fees and expenses incurred in connection with the negotiation, execution and effectuation of this Agreement and the transactions contemplated hereby.

12.          No Other Discussions or Arrangements. The Investor Parties represent and warrant that, as of the date of this Agreement, except as described herein, specifically disclosed to ClearSign in writing prior to the Effective Date and/or are reflected on the books and records of ClearSign, (a) the Investor Parties do not own, of record or beneficially, any Voting Securities or any securities convertible into, or exchangeable or exercisable for, any Voting Securities, (b) the Investor Parties have not entered into, directly or indirectly, any agreements or understandings with any person (other than their own Representatives) with respect to any potential transaction involving ClearSign or the voting or disposition of any securities of ClearSign and (c) no Investor Party is a member of or a participant in a “group” (within the meaning of Section 13(d)(3) of the Exchange Act) with respect to any Voting Securities as of the Effective Date.

13.          Governing Law; Jurisdiction. This Agreement shall be governed by and construed in accordance with the internal laws of the State of Delaware without giving effect to any choice or conflict of law provision or rule that would cause the application of laws of any jurisdiction other than those of the State of Delaware. Each Party agrees that it shall bring any suit, action or other proceeding in respect of any claim arising out of or related to this Agreement (each, an “Action”) exclusively in (a) the Delaware Court of Chancery, (b) in the event (but only in the event) that such court does not have subject matter jurisdiction over such Action, the United States District Court for the District of Delaware or (c) in the event (but only in the event) that such courts identified in clauses (a) and (b) do not have subject matter jurisdiction over such Action, any other Delaware state court (collectively, the “Chosen Courts”), and, solely in connection with an Action brought in accordance with this provision, irrevocably (i) submits to the exclusive jurisdiction of the Chosen Courts, (ii) waives any jurisdictional defenses (including, without limitation, personal jurisdiction and venue) to any such Action in the Chosen Courts, (iii) waives any objection that the Chosen Courts are an inconvenient forum or do not have jurisdiction over any Party and (iv) agrees that service of process upon such Party in any such Action shall be effective if notice is given in accordance with Section 17 hereof. Each Party agrees that a final judgment in any Action brought in the Chosen Courts shall be conclusive and binding upon each Party and may be enforced in any other courts, the jurisdiction of which each Party is or may be subject, by suit upon such judgment.

| 12 |

| --- |

14.          Waiver of Jury Trial. EACH PARTY HERETO ACKNOWLEDGES AND AGREES THAT ANY CONTROVERSY WHICH MAY ARISE UNDER THIS AGREEMENT IS LIKELY TO INVOLVE COMPLICATED AND DIFFICULT ISSUES AND, THEREFORE, EACH SUCH PARTY IRREVOCABLY AND UNCONDITIONALLY WAIVES TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW ANY RIGHT IT MAY HAVE TO A TRIAL BY JURY IN RESPECT OF ANY LEGAL ACTION ARISING OUT OF OR RELATING TO THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED BY THIS AGREEMENT. EACH PARTY TO THIS AGREEMENT CERTIFIES AND ACKNOWLEDGES THAT (A) NO REPRESENTATIVE OF ANY OTHER PARTY HAS REPRESENTED, EXPRESSLY OR OTHERWISE, THAT SUCH OTHER PARTY WOULD NOT SEEK TO ENFORCE THE FOREGOING WAIVER IN THE EVENT OF A LEGAL ACTION, (B) SUCH PARTY HAS CONSIDERED THE IMPLICATIONS OF THIS WAIVER, (C) SUCH PARTY MAKES THIS WAIVER VOLUNTARILY AND (D) SUCH PARTY HAS BEEN INDUCED TO ENTER INTO THIS AGREEMENT BY, AMONG OTHER THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS IN THIS SECTION 14.

15.          Specific Performance. Each Party acknowledges and agrees that irreparable injury to the other Parties would occur in the event any of the provisions of this Agreement are not performed in accordance with their specific terms or are otherwise breached and that such injury would not be adequately compensable by the remedies available at law (including, without limitation, the payment of money damages). It is accordingly agreed that each of the Parties (the “Moving Party”) shall be entitled to seek specific enforcement of, and injunctive or other equitable relief as a remedy for any such breach or to prevent any violation or threatened violation of, the terms hereof, and the other Parties will not take action, directly or indirectly, in opposition to the Moving Party seeking such relief on the grounds that any other remedy or relief is available at law or in equity. Each Party further agrees to waive any requirement for the security or posting of any bond in connection with any such relief. The remedies available pursuant to this Section 15 shall not be deemed to be the exclusive remedies for a breach of this Agreement but shall be in addition to all other remedies available at law or equity.

| 13 |

| --- |

16.          Certain Definitions. As used in this Agreement:

(a)            “Affiliate” shall mean any “Affiliate” as defined in Rule 12b-2 promulgated by the SEC under the Exchange Act, including, without limitation, persons who become Affiliates subsequent to the Effective Date; provided, however, that, for purposes of this Agreement, no Investor Party shall be deemed an Affiliate of ClearSign, and ClearSign shall not be deemed an Affiliate of any Investor Party; provided, further, that the term Affiliate shall not include MDB Capital Group, LLC (“MDB”), or any direct or indirect employees, consultants or agents of an Investor Party;

(e)            “Bylaws” shall mean ClearSign’s Bylaws, as filed with the SEC on June 15, 2023, as may be amended, corrected or amended and restated from time to time;

| 14 |

| --- |

(k)            “VotingSecurities” shall mean the Common Stock and any other securities of ClearSign entitled to vote in the election of directors.

17.            Notices. All notices, requests, consents, claims, demands, waivers and other communications hereunder shall be in writing and shall be deemed to have been given: (a) when delivered by hand (with written confirmation of receipt), (b) when received by the addressee if sent by a nationally recognized overnight courier (receipt requested), (c) on the date sent by email (with confirmation of transmission) if sent during normal business hours of ClearSign, and on the next business day if sent after normal business hours of ClearSign or (d) on the third day after the date mailed, by certified or registered mail, return receipt requested, postage prepaid. Such communications must be sent to the respective Parties at the addresses set forth in this Section 17 (or to such other address that may be designated by a Party from time to time in accordance with this Section 17).

If to ClearSign, to its address at:

ClearSign Technologies Corporation

8023 E. 63^rd^ Place, Suite 101

Tulsa, OK 74133

Attention: Jim Deller

with a copy (which shall not constitute notice) to:

Sullivan & Cromwell LLP

125 Broad Street

New York, NY 10004

Attention:

Email:

If to an Investor Party, to the address at:

with a copy (which shall not constitute notice) to:

Golenbock Eiseman Assor Bell & Peskoe LLP

711 Third Avenue

New York, NY 10017

Attention:

Email:

| 15 |

| --- |

18.          Entire Agreement; Amendment. This Agreement constitutes the sole and entire agreement of the Parties with respect to the subject matter contained herein, and it supersedes all prior and contemporaneous understandings, agreements, representations, and warranties, both written and oral, with respect to such subject matter. This Agreement may be amended, modified or supplemented only by an agreement in writing signed by each Party.

19.          Severability. If any term or provision of this Agreement is invalid, illegal or unenforceable in any jurisdiction, such invalidity, illegality or unenforceability shall not affect any other term or provision of this Agreement or invalidate or render unenforceable such term or provision in any other jurisdiction.

20.          Counterparts. This Agreement may be executed in counterparts, each of which shall be deemed an original, but all of which together shall be deemed to be one and the same agreement. A signed copy of this Agreement delivered by email or other means of electronic transmission shall be deemed to have the same legal effect as delivery of an original signed copy of this Agreement.

21.          Assignment. No Party may assign any of its rights or delegate any of its obligations hereunder without the prior written consent of the other Parties, provided, that each Party may assign any of its rights and delegate any of its obligations hereunder to any person that acquires substantially all of that Party’s assets, whether by stock sale, merger, asset sale or otherwise. Any purported assignment or delegation in violation of this Section 21 shall be null and void. No assignment or delegation shall relieve the assigning or delegating Party of any of its obligations hereunder. This Agreement is for the sole benefit of the Parties and their respective successors and permitted assigns and nothing herein, express or implied, is intended to or shall confer upon any other person any legal or equitable right, benefit or remedy of any nature whatsoever under or by reason of this Agreement.

22.          Waivers. No waiver by any Party of any of the provisions hereof shall be effective unless explicitly set forth in writing and signed by the Party so waiving. No waiver by any Party shall operate or be construed as a waiver in respect of any failure, breach or default not expressly identified by such written waiver, whether of a similar or different character, and whether occurring before or after that waiver. No failure to exercise, or delay in exercising, any right, remedy, power or privilege arising from this Agreement shall operate or be construed as a waiver thereof; nor shall any single or partial exercise of any right, remedy, power or privilege hereunder preclude any other or further exercise thereof or the exercise of any other right, remedy, power or privilege.

| 16 |

| --- |

23.          Interpretation. Each Party acknowledges that it has been represented by legal counsel of its choice throughout all negotiations that have preceded the execution of this Agreement and that it has executed the same with the advice of said counsel. Each Party and its respective legal counsel cooperated and participated in the drafting and preparation of this Agreement and the documents referred to herein, and any and all drafts relating thereto exchanged among the Parties shall be deemed the work product of all Parties and may not be construed against any Party by reason of its drafting or preparation. Accordingly, any rule of law or any legal decision that would require interpretation of any ambiguities in this Agreement against any Party that drafted or prepared it is of no application and is expressly waived by each Party, and any controversy over interpretations of this Agreement shall be decided without regard to events of drafting or preparation. The headings set forth in this Agreement are for convenience of reference purposes only and shall not affect or be deemed to affect in any way the meaning or interpretation of this Agreement or any term or provision of this Agreement. In this Agreement, unless a clear contrary intention appears, (a) the word “including” (in its various forms) means “including, without limitation,” (b) the words “hereunder,” “hereof,” “hereto” and words of similar import are references to this Agreement as a whole and not to any particular provision of this Agreement, (c) the word “or” is not exclusive, (d) references to “Sections” in this Agreement are references to Sections of this Agreement unless otherwise indicated and (e) whenever the context requires, the masculine gender shall include the feminine and neutral genders.

[Remainder of Page Intentionally Left Blank]

| 17 |

| --- |

IN WITNESS WHEREOF, the Parties have executed this Agreement to be effective as of the Effective Date.

CLEARSIGN:
CLEARSIGN TECHNOLOGIESCORPORATION
By:	/s/ David M. Maley
Name:	David M. Maley
Title:	Director
INVESTOR PARTIES:
/s/ Anthony DiGiandomenico
ANTHONY DIGIANDOMENICO

Signature Page to Cooperation Agreement

Exhibit 10.3

May 20, 2025

Re: Board of Directors of ClearSign TechnologiesCorporation - Offer Letter

Dear Louis J. Basenese:

On behalf of ClearSign Technologies Corporation (the “Company,” “ClearSign,” “we,” “our” or “us”) and our Board of Directors (“Board”), I am pleased to offer you a position as a member of our Board, including service as a member of the Board’s Human Capital and Compensation Committee, subject to (i) the approval by the Board of the resolutions authorizing your appointment and (ii) the execution and delivery of that certain cooperation agreement to be entered into between Richard D. Clarkson and the Company ((i) and (ii) together, the “Offer Conditions”). We look forward to working with you on the Board. Should you choose to accept this position as a member of the Board, including service as a member of the Board’s Human Capital and Compensation Committee and any other committees of the Board as may be determined by the Board at a later time, this letter shall constitute an agreement (the “Agreement”) between you and the Company and contains all the terms and conditions relating to the services to be provided.

1.            Term. This Agreement shall become effective on the date the Offer Conditions are satisfied and through the date of the next annual stockholders’ meeting. Your term as director shall continue until your successor is duly qualified and elected. The position shall be up for re-election each year at the annual stockholders’ meeting and upon re-election, the terms and provisions of this Agreement shall remain in full force and effect. You also agree to resign from the Board of Directors if requested by a majority of the then-sitting members of the Board. This Agreement shall be in effect as long as you are a director on the Board.

2.            Services. You shall render services in the area of managing or directing the Company’s property, affairs and business (hereinafter, your “Duties”). You shall consult with other members of the Board at meetings held quarterly, or more regularly if required, in locations determined by the Chairman of the Board of the Company, or if there is no then serving Chairman of the Board, the Chief Executive Officer of the Company. You agree that your relationship with the Company will be that of a director and not that of an employee. Nothing in this Agreement is intended to replace, supersede or diminish any of your duties to the Company as a director under state law. You also agree to comply with all federal and state securities laws as well as Company policies, as applicable.

3.            Services for Others. You are free to represent or perform services for other persons during the term of this Agreement. However, you agree that you do not presently perform and do not intend to perform, during the term of this Agreement, similar Duties, consulting or other services for companies whose businesses are or would be, in any way, in conflict or competitive with the Company (except for companies previously disclosed by you to the Company in writing). Should you propose to perform similar Duties, consulting or other services for any such company, you agree to notify the Company in writing in advance (specifying the name of the organization for whom you propose to perform such services) and to provide sufficient information to the Company to allow it to determine if the performance of such services would conflict with areas of interest to the Company.

4.            Compensation to Independent Directors. In consideration for your service as a member of the Board, you will receive an award of restricted stock units valued at $15,000 on the grant date, which grant date will be the first day of every quarter that you serve on the Board. In addition, in consideration for your service as a member of the Board’s Human Capital and Compensation Committee, you will receive an award of restricted stock units valued at $750 on the grant date, which grant date will be the first day of every quarter that you serve on such committee. The Company may also award additional restricted stock units to you on the first day of each quarter, with values ranging from $750 to $1,875 per quarter, should you join any other Board committees. These restricted stock units will vest upon death, departure from the board or a “change of control,” as such term is defined in the applicable Agreement as determined by the Board’s Compensation Committee and in accordance with the terms and conditions of the Company's 2021 Equity Incentive Plan. The Company will also reimburse you for reasonable expenses incurred in connection with the performance of your Duties as a director in accordance with the Company’s expense policy then in effect. Should you join the Board or any committee of the Board after the first day of any quarter, you will receive an award of restricted stock units that is pro-rated for the number of days remaining in such quarter.

5.            D&O Insurance Policy. You will be entitled to coverage under our Directors and Officers liability insurance as then in effect.

6.            Assignment. Because of the personal nature of the services to be rendered by you, this Agreement may not be assigned by you. The Company shall be free to transfer any of its rights under this Agreement to any affiliate or third party.

7.            Confidential Information; Non-Disclosure. In consideration of your access to the premises of the Company and your access to certain Confidential Information of the Company, in connection with your business relationship with the Company, you hereby represent and agree as follows:

a.            Definition. For purposes of this Agreement the term “Confidential Information” means:

i.            Any information which the Company possesses that has been created, discovered or developed by or for the Company, and which has or could have commercial value or utility in the business in which the Company is engaged; or

ii.            Any information that is related to the business of the Company and is generally not known by non-Company personnel.

iii.           By way of illustration, but not limitation, Confidential Information includes trade secrets and any information concerning products, processes, formulas, designs, inventions (whether or not patentable or registrable under copyright or similar laws, and whether or not reduced to practice), discoveries, concepts, ideas, improvements, techniques, methods, research, development and test results, specifications, data, know-how, software, formats, marketing plans, and analyses, business plans and analyses, strategies, forecasts, customer and supplier identities, characteristics and Agreements.

b.            Exclusions. Notwithstanding the foregoing, the term Confidential Information shall not include:

i.             Any information which becomes generally available to the public other than as a result of a breach of the confidentiality portions of this Agreement, or any other Agreement requiring confidentiality between the Company and you;

ii.            Information received from a third party in rightful possession of such information who is not restricted from disclosing such information; and

iii.           Information known by you prior to receipt of such information from the Company, which prior knowledge can be documented.

8.            Documents. You agree that, without the express written consent of the Company, you will not remove from the Company's premises, any notes, formulas, programs, data, records, machines or any other documents or items which in any manner contain or constitute Confidential Information, nor will you make reproductions or copies of same. In the event you receive any such documents or items by personal delivery from any duly designated or authorized personnel of the Company, you shall be deemed to have received the express written consent of the Company. In the event that you receive any such documents or items, other than through personal delivery as described in the preceding sentence, you agree to inform the Company promptly of your possession of such documents or items. You agree to promptly return any such documents or items, along with any reproductions or copies to the Company upon the Company's demand or upon termination of this Agreement or your departure from the Board.

9.            Non-Disparagement. You agree to forbear from making, causing to be made, publishing, ratifying or endorsing any and all disparaging remarks, derogatory statements or comments to any third party with respect to the Company and its affiliates, including, without limitation, the Company’s parent, subsidiaries, officers, directors and employees (collectively, “Company Parties”). Further, you hereby agree to forbear from making any public or non-confidential statement with respect to any of the Company Parties. The duties and obligations of this paragraph 9 shall continue following the termination of this Agreement.

10.          Non-Solicitation. You agree and covenant not to directly or indirectly solicit, hire, or recruit for your own benefit or the benefit of any other person, or so attempt to solicit, hire, or recruit, any employee of the Company, or induce any other employee of the Company to terminate their employment for two (2) years immediately following your cessation of services to the Company, regardless of the reason. This non-solicitation paragraph explicitly covers all forms of oral, written, or electronic communication, including, but not limited to, communications by email, regular mail, express mail, telephone, fax, instant message, and social media, including, but not limited to, Facebook, LinkedIn, Instagram, and Twitter, and any other social media platform, whether or not in existence at the time of entering into this Agreement.

11.          No Disclosure. You agree that you will hold in trust and confidence all Confidential Information and will not disclose to others, directly or indirectly, any Confidential Information or anything relating to such information without the prior written consent of the Company, except as maybe necessary in the course of this business relationship with the Company. You further agree that you will not use any Confidential Information without the prior written consent of the Company, except as may be necessary in the course of your business relationship with the Company, and that the provisions of this paragraph 11 shall survive termination of this Agreement.

12.          Termination. This Agreement shall terminate in the event of your resignation or termination as a director, or your refusal to stand for re-election or decision not to be nominated or if you are not re-elected for additional terms as a director, effective on the date of your departure from the Board.

13.          Entire Agreement; Amendment; Waiver. Other than any requirements and duties under applicable law, this Agreement expresses the entire understanding with respect to the subject matter hereof and supersedes and terminates any prior oral or written Agreements with respect to the subject matter hereof. Any term of this Agreement may be amended and observance of any term of this Agreement may be waived only with the written consent of the parties hereto. Waiver of any term or condition of this Agreement by any party shall not be construed as a waiver of any subsequent breach or failure of the same term or condition or waiver of any other term or condition of this Agreement. The failure of any party at any time to require performance by any other party of any provision of this Agreement shall not affect the right of any such party to require future performance of such provision or any other provision of Agreement.

14.            Enforcement.

a.            Applicable Law. This Agreement and the rights and remedies of each party arising out of or relating to this Agreement (including, without limitation, equitable remedies) shall be solely governed by, interpreted under, and construed and enforced in accordance with the laws (without regard to the conflicts of law principles thereof) of the State of Delaware, as if this Agreement were made, and as if its obligations are to be performed, wholly within the State of Oklahoma.

b.            Consent to Jurisdiction and Venue. Any action or proceeding arising out of or relating to this Agreement shall be filed in and heard and litigated solely before the state or federal courts of Oklahoma within Tulsa County.

c.            Attorneys’ Fees. If court proceedings are required to enforce any provision of this Agreement, the substantially prevailing or successful party shall be entitled to an award of the reasonable and necessary expenses of litigation, including reasonable attorneys’ fees.

[Signature page follows.]

I appreciate your willingness to serve on our Board and look forward to working with you to serve the Company together. Please indicate your acceptance by signing and returning the enclosed copy of this letter.

Very truly yours,
ClearSign Technologies Corporation
/s/ Colin James Deller
Dr. Colin James Deller, Chief Executive Officer
ACCEPTED AND AGREED:
---
/s/ Louis J. Basenese
Name: Louis J. Basenese
Date: 05/20/2025

Exhibit 10.4

May 20, 2025

Re: Board of Directors of ClearSign TechnologiesCorporation - Offer Letter

Dear Anthony DiGiandomenico:

On behalf of ClearSign Technologies Corporation (the “Company,” “ClearSign,” “we,” “our” or “us”) and our Board of Directors (“Board”), I am pleased to offer you a position as a member of our Board, subject to (i) the approval by the Board of the resolutions authorizing your appointment and (ii) the execution and delivery of that certain cooperation agreement to be entered into between you and the Company ((i) and (ii) together, the “Offer Conditions”). We look forward to working with you on the Board. Should you choose to accept this position as a member of the Board, and any committees of the Board as may be determined by the Board at a later time, this letter shall constitute an agreement (the “Agreement”) between you and the Company and contains all the terms and conditions relating to the services to be provided.

4.            Compensation to Independent Directors. In consideration for your service as a member of the Board, you will receive an award of restricted stock units valued at $15,000 on the grant date, which grant date will be the first day of every quarter that you serve on the Board. The Company may also award additional restricted stock units to you on the first day of each quarter, with values ranging from $750 to $1,875 per quarter, should you join any Board committees. These restricted stock units will vest upon death, departure from the board or a “change of control,” as such term is defined in the applicable Agreement as determined by the Board’s Compensation Committee and in accordance with the terms and conditions of the Company's 2021 Equity Incentive Plan. The Company will also reimburse you for reasonable expenses incurred in connection with the performance of your Duties as a director in accordance with the Company’s expense policy then in effect. Should you join the Board or any committee of the Board after the first day of any quarter, you will receive an award of restricted stock units that is pro-rated for the number of days remaining in such quarter.

5.            D&O Insurance Policy. You will be entitled to coverage under our Directors and Officers liability insurance as then in effect.

a.            Definition. For purposes of this Agreement the term “Confidential Information” means:

i.             Any information which the Company possesses that has been created, discovered or developed by or for the Company, and which has or could have commercial value or utility in the business in which the Company is engaged; or

ii.            Any information that is related to the business of the Company and is generally not known by non-Company personnel.

b.            Exclusions. Notwithstanding the foregoing, the term Confidential Information shall not include:

ii.            Information received from a third party in rightful possession of such information who is not restricted from disclosing such information; and

iii.            Information known by you prior to receipt of such information from the Company, which prior knowledge can be documented.

| 2 |

| --- |

14.          Enforcement.

[Signature page follows.]

| 3 |

| --- |

Very truly yours,
ClearSign Technologies Corporation
/s/ Colin James Deller
Dr. Colin James Deller, Chief Executive Officer
ACCEPTED AND AGREED:
---
/s/ Anthony DiGiandomenico
Name: Anthony DiGiandomenico
Date: 05/20/2025

| 4 |

| --- |

Exhibit 99.1

ClearSign Technologies Corporation AnnouncesChanges to Board of Directors

TULSA, Okla., May 27, 2025 -- ClearSign Technologies Corporation (Nasdaq: CLIR) (“ClearSign” or the “Company”), an emerging leader in industrial combustion and sensing technologies that support decarbonization***,*** improve operational and energy efficiency, enable the use of hydrogen as a fuel and enhance safety while dramatically reducing emissions, today announced that the Company’s Board of Directors (the “Board”) has voted to expand in size from five to seven directors and it appointed Anthony DiGiandomenico and Lou Basenese to fill such newly created vacancies and to serve as members of the Board, effective as of May 22, 2025. Further, on May 27, 2025, David M. Maley, a member of the Board, notified the Company that he will not stand for re-election upon the expiration of his term at the Company’s 2025 annual meeting of stockholders. The Board has not yet determined whether it will reduce its size or nominate a replacement director at this time.

“I am very pleased to welcome both Anthony and Lou to the Board,” said Jim Deller, Ph.D., Chief Executive Officer of ClearSign. “Both have been long time supporters of ClearSign. Their existing knowledge of the Company and its technologies combined with their capital markets experience and industry connections will make them valuable and productive additions to the Board. Additionally, David Maley has indicated that he will not be standing for re-election on the upcoming annual meeting of stockholders, and we thank him for his service to ClearSign.”

Mr. DiGiandomenico has been working with and enabling investment into early-stage disruptive technologies for most of his career. He has worked alongside a wide range of companies in biotechnology, medical devices, high technology, and renewable energy spaces. Mr. DiGiandomenico currently serves as the Chief of Transactions and director of MDB Capital Holdings, LLC (NASDAQ: MDBH), a broker-dealer and financial advisory firm based in Dallas, Texas, which he co-founded in 1997 as MDB Capital Group, LLC. Previously, he has served on the board of directors of Provention Bio, Inc., a developer of multiple drug therapies, from January 2017 until May 2020 and the board of directors of Cue Biopharma, Inc., a company that develops novel biologic drugs for the selective modulation of the human immune system to treat a broad range of cancers and autoimmune disorders, from January 2016 to October 2019. Mr. DiGiandomenico holds an MBA from the Haas School of Business at the University of California, Berkeley and a B.S. in Finance from the University of Colorado.

Lou Basenese brings over 25 years of experience in equity research and analysis, investment banking, strategic planning, thought leadership development and communications. Mr. Basenese currently serves as Executive Vice President – Market Strategy for Prairie Operating Co. (Nasdaq: PROP), a Houston-based publicly traded independent energy company engaged in the development and acquisition of oil and natural gas resources in the United States. He also serves as CEO and Chief Strategist of The Basenese Group, LLC, a full-service equity research, strategy, and advisory firm. Mr. Basenese also serves on the board of directors of ENDRA Life Sciences, Inc. (Nasdaq: NDRA), a life sciences company that develops technologies to improve the capabilities of clinical diagnostic ultrasound, and the board of directors of The Roberto Clemente Health Clinic, a U.S.-based non-profit that provides affordable access to high quality health care and wellness programs in the Tola coastal communities of Nicaragua. Prior to his current roles, Mr. Basenese served as President and Chief Market Strategist of MDB Capital Holdings, LLC (Nasdaq: MDBH) and in various analyst, strategist, and account executive roles in the financial services and research industries. Mr. Basenese holds an MBA from the Crummer Graduate School of Business at Rollins College and a B.A. in English from the University of Florida.

About ClearSign Technologies Corporation

ClearSign Technologies Corporation designs and develops products and technologies for the purpose of decarbonization and improving key performance characteristics of industrial and commercial systems, including operational performance, energy efficiency, emission reduction, safety, the use of hydrogen as a fuel and overall cost-effectiveness. Our patented technologies, embedded in established OEM products as ClearSign Core™ and ClearSign Eye™ and other sensing configurations, enhance the performance of combustion systems and fuel safety systems in a broad range of markets, including the energy (upstream oil production and down-stream refining), commercial/industrial boiler, chemical, petrochemical, transport and power industries. For more information, please visit www.clearsign.com.

For further information:

Investor Relations:

Matthew Selinger

Firm IR Group for ClearSign

+1 415-572-8152

mselinger@firmirgroup.com