CLIR Pengajuan SEC - ClearSign Technologies Corporation- Laporan Tahunan, Pernyataan Kuasa, Prospektus

Mga Batayang Estadistika

LEI	529900KAAUSQWCW66J95
CIK	1434524

SEC Filings

All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to ClearSign Technologies Corporation

SEC Filings (Chronological Order)

Halaman ini menyediakan daftar lengkap dan kronologis dari Pengajuan SEC, tidak termasuk pengajuan kepemilikan yang kami sediakan di tempat lain.

August 29, 2025	8-K	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): August 26, 2025 CLEARSIGN TECHNOL 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): August 26, 2025 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in charter) Delaware 001-35521 26-2056298 (State or other jurisdiction of incorporation) (Com
August 22, 2025	424B4	PROSPECTUS 5,267,222 Shares of Common Stock Underlying the Warrants Filed Pursuant to Rule 424(b)(4) Registration No. 333-289549 PROSPECTUS 5,267,222 Shares of Common Stock Underlying the Warrants This prospectus relates to the issuance of up to 5,267,222 shares of our common stock, par value $0.0001 per share, or the common stock, available for issuance upon the exercise of 5,267,222 redeemable warrants, or the Warrants, previously issued as part of our public of
August 20, 2025	S-1/A	As filed with the Securities and Exchange Commission on August 20, 2025 As filed with the Securities and Exchange Commission on August 20, 2025 Registration No.
August 15, 2025	EX-99.1	ClearSign Technologies Corporation Provides Second Quarter 2025 Update Exhibit 99.1 ClearSign Technologies Corporation Provides Second Quarter 2025 Update TULSA, Okla., August 14, 2025 – ClearSign Technologies Corporation (Nasdaq: CLIR) (“ClearSign” or the “Company”), a leader in advanced combustion and sensing technologies that help industrial operators dramatically reduce emissions, increase efficiency and safety, and support the use of cleaner fuels including hydr
August 15, 2025	8-K	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): August 14, 2025 CLEARSIGN TECHNOL 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): August 14, 2025 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in charter) Delaware 001-35521 26-2056298 (State or other jurisdiction of incorporation) (Com
August 15, 2025	EX-99.2	Transcript of ClearSign Technologies Corporation 2Q 2025 Earnings Conference Call August 14, 2025 Exhibit 99.2 Transcript of ClearSign Technologies Corporation 2Q 2025 Earnings Conference Call August 14, 2025 Participants Matthew Selinger - Investor Relations, Firm IR Group Brent Hinds - Chief Financial Officer, ClearSign Technologies Corporation Jim Deller - Chief Executive Officer, ClearSign Technologies Corporation Analysts Presentation Operator Welcome to the ClearSign Technologies 2Q 2025
August 14, 2025	10-Q	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 00
August 12, 2025	EX-FILING FEES	Filing Fee Table. Calculation of Filing Fee Tables S-1 ClearSign Technologies Corp Table 1: Newly Registered and Carry Forward Securities ☐Not Applicable Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be Paid 1 Equity Common stock, $0.
August 12, 2025	S-1	As filed with the Securities and Exchange Commission on August 12, 2025 As filed with the Securities and Exchange Commission on August 12, 2025 Registration No.
August 8, 2025	8-K	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): August 4, 2025 CLEARSIGN TECHNOLO 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): August 4, 2025 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in charter) Delaware 001-35521 26-2056298 (State or other jurisdiction of incorporation) (Comm
August 8, 2025	EX-99.1	ClearSign Technologies Corporation Announces Realignment of Board of Directors to Support Next Phase of Growth Exhibit 99.1 ClearSign Technologies Corporation Announces Realignment of Board of Directors to Support Next Phase of Growth TULSA, Okla., August 8, 2025 - ClearSign Technologies Corporation (Nasdaq: CLIR) (“ClearSign” or the “Company”), a leader in advanced combustion and sensing technologies that help industrial operators dramatically reduce emissions, increase efficiency and safety, and support
July 28, 2025	8-K	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): July 25, 2025 CLEARSIGN TECHNOLOG 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): July 25, 2025 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in charter) Delaware 001-35521 26-2056298 (State or other jurisdiction of incorporation) (Commi
July 24, 2025	CORRESP	ClearSign Technologies Corporation – 8023 East 63rd Place, Suite 101, Tulsa, Oklahoma 74133 – Tel: 206.673.4848 – www.clearsign.com July 24, 2025 VIA EDGAR U.S. Securities and Exchange Commission Division of Corporation Finance 100 F Street, N.E. Washington, D.C. 20549 RE: ClearSign Technologies Corporation Registration Statement on Form S-3 Filed July 17, 2025 File No. 333-288736 Acceleration Request Requested Date: Monday, July 28, 2025 Requested Time: 4:30 p.m. Eastern Time Ladies and Gentlemen: In accordance with Rule 461
July 18, 2025	8-K	Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Other Events 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): July 12, 2025 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in charter) Delaware 001-35521 26-2056298 (State or other jurisdiction of incorporation) (Commi
July 17, 2025	S-3	As filed with the Securities and Exchange Commission on July 17, 2025 As filed with the Securities and Exchange Commission on July 17, 2025 Registration No.
July 17, 2025	EX-FILING FEES	Filing Fee Table Exhibit 107 Calculation of Filing Fee Tables Form S-3 (Form Type) ClearSign Technologies Corporation (Exact Name of Registrant as Specified in its Charter) Table 1-Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered (1) Proposed Maximum Offering Price Per Unit (2) Proposed Maximum Aggregate Offering Price (3) Fee Rate Amount of Registration Fee Fees to Be Paid Equity Common Stock, par value $0.
July 17, 2025	EX-1.2	At The Market Offering Agreement by and between ClaerSign Technologies Corporation and H.C. Wainwright & Co., LLC, dated July 17, 2025 (incorporated by reference to Exhibit 1.2 to the Company’s Form S-3 filed with the Securities and Exchange Commission on July 17, 2025). Exhibit 1.2   AT THE MARKET OFFERING AGREEMENT   July 17, 2025   H.C. Wainwright & Co., LLC 430 Park Avenue New York, New York 10022   Ladies and Gentlemen:   ClearSign Technologies Corporation, a corporation organized under the laws of Delaware (the “Company”), confirms its agreement (this “Agreement”) with H.C. Wainwright & Co., LLC (the “Manager”) as follows:   1.             Definitions. The t
July 17, 2025	EX-4.1	Form of Indenture for Debt Securities. Exhibit 4.1 CLEARSIGN TECHNOLOGIES CORPORATION Issuer AND [TRUSTEE], Trustee INDENTURE Dated as of , 20 Debt Securities Table Of Contents Page article 1 DEFINITIONS 1 Section 1.01 Definitions of Terms 1 article 2 ISSUE, DESCRIPTION, TERMS, EXECUTION, REGISTRATION AND EXCHANGE OF SECURITIES 5 Section 2.01 Designation and Terms of Securities 5 Section 2.02 Form of Securities and Trustee’s Certificat
July 11, 2025	8-K	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): June 27, 2025 CLEARSIGN TECHNOLOG 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): June 27, 2025 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in charter) Delaware 001-35521 26-2056298 (State or other jurisdiction of incorporation) (Commi
July 11, 2025	DEFA14A	SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.
June 13, 2025	DEF 14A	SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Table of Contents SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.
June 13, 2025	DEFA14A	SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ⌧ Filed by a Party other than the Registrant ◻ Check the appropriate box: ◻ Preliminary Proxy Statement ◻ Confidential, For Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ◻ Definitive Proxy Statement ⌧ Definitive Additional Materials ◻ Soliciting Material Pursuant to §240.
May 29, 2025	PREC14A	SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Table of Contents SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.
May 28, 2025	10-K/A	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K/A (Amendment No. 1) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K/A (Amendment No. 1) (Mark One) x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 OR ¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 001-3
May 27, 2025	EX-10.3	Louis J. Basenese’s Offer Letter, effective as of May 22, 2025. Exhibit 10.3 May 20, 2025 Re: Board of Directors of ClearSign Technologies Corporation - 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
May 27, 2025	EX-99.1	ClearSign Technologies Corporation Announces Changes to Board of Directors Exhibit 99.1 ClearSign Technologies Corporation Announces Changes 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 whi
May 27, 2025	EX-10.2	Cooperation Agreement, dated May 22, 2025, by and between ClearSign Technologies Corporation and Anthony DiGiandomenico. 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
May 27, 2025	8-K	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 TECHNOLOGI 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) (Commis
May 27, 2025	EX-10.1	Cooperation Agreement, dated May 22, 2025, by and between ClearSign Technologies Corporation and Richard D. Clarkson. 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 Par
May 27, 2025	EX-10.4	Anthony DiGiandomenico’s Offer Letter, effective as of May 22, 2025. Exhibit 10.4 May 20, 2025 Re: Board of Directors of ClearSign Technologies Corporation - 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 authorizin
May 23, 2025	EX-99.1	ClearSign Technologies Corporation Provides First Quarter 2025 Update Exhibit 99.1 ClearSign Technologies Corporation Provides First Quarter 2025 Update TULSA, Okla., May 21, 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 dr
May 23, 2025	EX-99.2	ClearSign Technologies Corporation First Quarter 2025 Conference Call Event Date/Time: May 21, 2025 — 5:00 p.m. E.T. Length: 66 minutes Exhibit 99.2 ClearSign Technologies Corporation First Quarter 2025 Conference Call Event Date/Time: May 21, 2025 — 5:00 p.m. E.T. Length: 66 minutes "While Cision has used commercially reasonable efforts to produce this transcript, it does not represent or warrant that this transcript is error-free. Cision will not be responsible for any direct, indirect, incidental, special, consequential, loss o
May 23, 2025	8-K	Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition 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 21, 2025 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in charter) Delaware 001-35521 26-2056298 (State or other jurisdiction of incorporation) (Commis
May 15, 2025	10-Q	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 00
April 4, 2025	EX-99.2	ClearSign Technologies Corporation Fourth Quarter and Full Year 2024 Conference Call Event Date/Time: April 2, 2025 — 5:00 p.m. E.T. Length: 51 minutes Exhibit 99.2 ClearSign Technologies Corporation Fourth Quarter and Full Year 2024 Conference Call Event Date/Time: April 2, 2025 — 5:00 p.m. E.T. Length: 51 minutes “While Cision has used commercially reasonable efforts to produce this transcript, it does not represent or warrant that this transcript is error-free. Cision will not be responsible for any direct, indirect, incidental, special, conse
April 4, 2025	EX-99.1	ClearSign Technologies Corporation Provides Full Year 2024 Update Company Achieves Record Annual Revenue of $3.6 Million Exhibit 99.1 ClearSign Technologies Corporation Provides Full Year 2024 Update Company Achieves Record Annual Revenue of $3.6 Million TULSA, Okla., April 2, 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 u
April 4, 2025	8-K	Regulation FD Disclosure, Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing, Financial Statements and Exhibits, Results of Operations and Financial Condition 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): April 1, 2025 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in charter) Delaware 001-35521 26-2056298 (State or other jurisdiction of incorporation) (Commi
March 31, 2025	EX-FILING FEES	Filing Fee Table. Exhibit 107 Calculation of Filing Fee Table Form S-8 (Form Type) ClearSign Technologies Corporation (Exact Name of Registrant as Specified in its Charter) Newly Registered Securities Security Type Security Class Title Fee Calculation Rule Amount Registered(1) Proposed Maximum Offering Price Per Unit(2) Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Equity Common Stock, $0.
March 31, 2025	10-K	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 001-355
March 31, 2025	EX-4.1	filed with the SEC on March 31, 2025 DESCRIPTION OF SECURITIES General The following summary of certain material terms of the securities of ClearSign Technologies Corporation (the “Company,” “we,” “us” or “our”) is not intended to be a complete summary of the rights and preferences of such securities.
March 31, 2025	S-8	As filed with the U.S. Securities and Exchange Commission on March 31, 2025 As filed with the U.S. Securities and Exchange Commission on March 31, 2025 Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 ClearSign Technologies Corporation (Exact name of Registrant as specified in its charter) Delaware 26-2056298 (State or other jurisdiction of incorporation or organi
March 31, 2025	EX-19	Insider Trading Policy Exhibit 19 Statement of ClearSign Technologies Corporation Policy on Insider Trading and Compliance It is the policy of ClearSign Technologies Corporation (the “Company”) to comply fully, and to assist its directors, officers and other employees in complying fully, with all federal and state securities laws applicable to transactions in the Company’s securities or securities of its affiliates.
December 9, 2024	EX-99.1	ClearSign Technologies Corporation Regains Compliance with Nasdaq’s Minimum Bid Price Requirement Exhibit 99.1 ClearSign Technologies Corporation Regains Compliance with Nasdaq’s Minimum Bid Price Requirement TULSA, Oklahoma, December 9, 2024 - 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
December 9, 2024	8-K	Financial Statements and Exhibits, Other Events 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): December 6, 2024 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in charter) Delaware 001-35521 26-2056298 (State or other jurisdiction of incorporation) (Co
November 21, 2024	EX-99.1	ClearSign Technologies Corporation Provides Third Quarter 2024 Update Company Achieves Record Quarterly Revenue of $1.85MM Exhibit 99.1 ClearSign Technologies Corporation Provides Third Quarter 2024 Update Company Achieves Record Quarterly Revenue of $1.85MM TULSA, Okla., November 20, 2024 - 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
November 21, 2024	8-K	Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition 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): November 20, 2024 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in charter) Delaware 001-35521 26-2056298 (State or other jurisdiction of incorporation) (C
November 21, 2024	EX-99.2	[CLIR] ClearSign Technologies Q3 2024 Earnings Conference Call November 20, 2024, 5:00 PM ET. Exhibit 99.2 [CLIR] ClearSign Technologies Q3 2024 Earnings Conference Call November 20, 2024, 5:00 PM ET. Officers and Speakers Matthew Selinger, Firm IR Group Brent Hinds, Chief Financial Officer Jim Deller, Chief Executive Officer Presentation Operator: Good afternoon, and welcome to the ClearSign Technologies Third Quarter 2024 Conference Call. (Operator Instructions). After today's presentati
November 14, 2024	10-Q	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Numbe
November 7, 2024	10-K/A	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K/A (Amendment No. 2) Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K/A (Amendment No. 2) (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission
October 30, 2024	8-K	Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing, Financial Statements and Exhibits 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): October 30, 2024 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in Charter) Delaware 001-35521 26-2056298 (State or other jurisdiction of incorporation) (Co
October 1, 2024	8-K	Financial Statements and Exhibits, Costs Associated with Exit or Disposal Activities 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): October 1, 2024 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in Charter) Delaware 001-35521 26-2056298 (State or other jurisdiction of incorporation) (Com
August 23, 2024	EX-99.2	Event Name: ClearSign Technologies Second Quarter 2024 Conference Call Exhibit 99.2 Event Name: ClearSign Technologies Second Quarter 2024 Conference Call Event Date: Wednesday, August 21, 2024, 5:00 p.m. Eastern Time Officers and Speakers Matthew Selinger; Firm IR Group Brent Hinds; Chief Financial Officer Jim Deller; Chief Executive Officer Analysts Amit Dayal; H.C. Wainwright Presentation Operator: Good afternoon, and welcome to the ClearSign Technologies Second Q
August 23, 2024	8-K	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): August 21, 2024 CLEARSIGN TECHNOL 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): August 21, 2024 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in charter) Delaware 001-35521 26-2056298 (State or other jurisdiction of incorporation) (Com
August 23, 2024	8-K/A	Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K/A (Amendment No. 2) CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): June 24, 2024 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in charter) Delaware 001-35521 26-2056298 (State or other jurisdiction of i
August 23, 2024	EX-99.1	ClearSign Technologies Corporation Provides Second Quarter 2024 Update Exhibit 99.1 ClearSign Technologies Corporation Provides Second Quarter 2024 Update TULSA, Okla., August 21, 2024 - ClearSign Technologies Corporation (Nasdaq: CLIR) (“ClearSign” or the “Company”), an emerging leader in industrial combustion and sensing technologies that improve energy, operational efficiency and safety while dramatically reducing emissions, today provides an update on operations
August 14, 2024	10-Q	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 001
August 6, 2024	EX-10.1	G. Todd Silva’s Offer Letter, effective as of August 1, 2024 (incorporated by reference to Exhibit 10.1 of the Company’s Form 8-K filed with the Securities and Exchange Commission on August 6, 2024). Exhibit 10.1 July 19, 2024 Re: Board of Directors of ClearSign Technologies Corporation - Offer Letter Dear Mr. G. Todd Silva: 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 non-independent member of our Board and as the director nominated by clirSPV in accordance with
August 6, 2024	EX-99.1	ClearSign Technologies Appoints G. Todd Silva to Board of Directors Exhibit 99.1 ClearSign Technologies Appoints G. Todd Silva to Board of Directors TULSA, Okla., August 6, 2024 - ClearSign Technologies Corporation (Nasdaq: CLIR) (“ClearSign” or the “Company”), an emerging leader in industrial combustion and sensing technologies that improve energy, operational efficiency and safety while dramatically reducing emissions, announces that G. Todd Silva has been appoi
August 6, 2024	8-K	Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits 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): August 1, 2024 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in Charter) Delaware 001-35521 26-2056298 (State or other jurisdiction of incorporation) (Comm
July 15, 2024	424B4	PROSPECTUS 5,599,763 Shares of Common Stock 4,498,642 Shares of Common Stock Issuable Upon Exercise of Pre-Funded Warrants 15,147,606 Shares of Common Stock Issuable Upon Exercise of Private Warrants 15,147,606 Private Warrants Filed pursuant to Rule 424(b)(4) Registration No. 333-279550 PROSPECTUS 5,599,763 Shares of Common Stock 4,498,642 Shares of Common Stock Issuable Upon Exercise of Pre-Funded Warrants 15,147,606 Shares of Common Stock Issuable Upon Exercise of Private Warrants 15,147,606 Private Warrants This prospectus relates to the resale, from time to time, by the selling stockholders identified in this prospe
July 10, 2024	CORRESP	ClearSign Technologies Corporation – 8023 East 63rd Place, Suite 101, Tulsa, Oklahoma 74133 – Tel: 206.673.4848 – www.clearsign.com July 10, 2024 VIA EDGAR U.S. Securities and Exchange Commission Division of Corporation Finance 100 F Street, N.E. Washington, D.C. 20549 RE: ClearSign Technologies Corporation Registration Statement on Form S-1, as amended Filed July 3, 2024 File No. 333-279550 Acceleration Request Requested Date: Friday, July 12, 2024 Requested Time: 4:30 p.m. Eastern Time Ladies and Gentlemen: In accordance wit
July 3, 2024	EX-FILING FEES	Filing fee table. Exhibit 107 Calculation of Filing Fee Tables Form S-1 (Form Type) ClearSign Technologies Corporation (Exact Name of Registrant as Specified in its Charter) Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Share(4) Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee(5) Fees to be Paid Equity Common stock, par value $0.
July 3, 2024	S-1/A	As filed with the Securities and Exchange Commission on July 3, 2024 As filed with the Securities and Exchange Commission on July 3, 2024 Registration No.
June 28, 2024	8-K/A	UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K/A (Amendment No. 1) CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): June 24, 2024 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K/A (Amendment No. 1) CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): June 24, 2024 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in charter) Delaware 001-35521 26-2056298 (State or other jurisdiction of i
June 26, 2024	EX-10.1	Securities Purchase Agreement, dated June 24, 2024, Exhibit 10.1 SECURITIES PURCHASE AGREEMENT This Securities Purchase Agreement (this “Agreement”) is dated as of June 24, 2024, between ClearSign Technologies Corporation, a Delaware corporation (the “Company”), and clirSPV LLC (“Purchaser”). WHEREAS, in connection with a private placement of Common Stock (as defined below) pursuant to the clirSPV SPA (as defined below), the Company granted Purchas
June 26, 2024	SC 13D/A	CLIR / ClearSign Technologies Corporation / clirSPV LLC - SCHEDULE 13D/A - AMENDMENT NO. 4 Activist Investment SC 13D/A 1 ctc-sc13daamend4.htm SCHEDULE 13D/A - AMENDMENT NO. 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 4)* ClearSign Technologies Corporation (Name of Issuer) Common Stock (Title of Class of Securities) 185064102 (CUSIP Number) Robert T. Hoffman Sr. c/o clirSPV LLC 119 Warren Avenue, 3rd Floor S
June 26, 2024	8-K	Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Entry into a Material Definitive Agreement, Unregistered Sales of Equity Securities, Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders 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): June 24, 2024 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in charter) Delaware 001-35521 26-2056298 (State or other jurisdiction of incorporation) (Commi
June 26, 2024	EX-3.1	Certificate of Amendment, as filed with the Secretary of the State of Delaware on June 25, 2024 (incorporated by reference to Exhibit 3.1 of the Company’s Form 8-K filed with the Securities and Exchange Commission on June 26, 2024). Exhibit 3.1 Delaware Page 1 The First State I, JEFFREY W. BULLOCK, SECRETARY OF STATE OF THE STATE OF DELAWARE, DO HEREBY CERTIFY THE ATTACHED IS A TRUE AND CORRECT COPY OF THE CERTIFICATE OF AMENDMENT OF “CLEARSIGN TECHNOLOGIES CORPORATION”, FILED IN THIS OFFICE ON THE TWENTY-FIFTH DAY OF JUNE, A.D. 2024, AT 4:30 O`CLOCK P.M. 7513798 8100 SR# 20242980975 Authentication: 203793799 Date: 06-25-24 Y
June 26, 2024	EX-10.2	Amendment to Securities Purchase Agreement, dated June 26, 2024. Exhibit 10.2 CLEARSIGN TECHNOLOGIES CORPORATION AMENDMENT TO SECURITIES PURCHASE AGREEMENT This Amendment to the Securities Purchase Agreement (this “Amendment”), dated as of June 26, 2024, is made by and between ClearSign Technologies Corporation, a Delaware corporation (the “Company”), and clirSPV LLC (the “Purchaser”). Unless otherwise defined herein, capitalized terms shall have the meanings a
June 20, 2024	8-K	Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Other Events 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): June 16, 2024 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in charter) Delaware 001-35521 26-2056298 (State or other jurisdiction of incorporation) (Commi
June 20, 2024	EX-99.1	ClearSign Technologies Announces Full Exercise of Participation Right Granted to clirSPV LLC and Board Transition Exhibit 99.1 ClearSign Technologies Announces Full Exercise of Participation Right Granted to clirSPV LLC and Board Transition TULSA, Okla., June 20, 2024 - ClearSign Technologies Corporation (Nasdaq: CLIR) (“ClearSign” or the “Company”), an emerging leader in industrial combustion and sensing technologies that improve energy, operational efficiency and safety while dramatically reducing emissions
June 20, 2024	DEFA14A	SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. 2) SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.
June 10, 2024	DEFA14A	SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. 1) SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.
June 7, 2024	8-K	Financial Statements and Exhibits, Other Events 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): June 3, 2024 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in charter) Delaware 001-35521 26-2056298 (State or other jurisdiction of incorporation) (Commis
May 28, 2024	EX-99.1	ClearSign Technologies Corporation Provides First Quarter 2024 Update Exhibit 99.1 ClearSign Technologies Corporation Provides First Quarter 2024 Update TULSA, Okla., May 23, 2024 - ClearSign Technologies Corporation (Nasdaq: CLIR) (“ClearSign” or the “Company”), an emerging leader in industrial combustion and sensing technologies that improve energy, operational efficiency and safety while dramatically reducing emissions, today provides an update on operations for
May 28, 2024	EX-99.2	Event Name: ClearSign Technologies First Quarter 2024 Conference Call Exhibit 99.2 Event Name: ClearSign Technologies First Quarter 2024 Conference Call Event Date: Thursday, May 23, 2024, 5:00 p.m. Eastern Time Officers and Speakers Matthew Selinger; Firm IR Group Brent Hinds; Chief Financial Officer Jim Deller; Chief Executive Officer Presentation Operator: Good afternoon, and welcome to the ClearSign Technologies First Quarter 2024 Conference Call. [Operator Inst
May 28, 2024	8-K	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 23, 2024 CLEARSIGN TECHNOLOGI 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 23, 2024 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in charter) Delaware 001-35521 26-2056298 (State or other jurisdiction of incorporation) (Commis
May 20, 2024	S-1	As filed with the Securities and Exchange Commission on May 20, 2024 As filed with the Securities and Exchange Commission on May 20, 2024 Registration No.
May 20, 2024	EX-FILING FEES	Filing fee table. Exhibit 107 Calculation of Filing Fee Tables Form S-1 (Form Type) ClearSign Technologies Corporation (Exact Name of Registrant as Specified in its Charter) Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Share(4) Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee(5) Fees to be Paid Equity Common stock, par value $0.
May 20, 2024	EX-10.25	Amendment to Warrant Agency Agreement, dated as of May 15, 2024, by and between ClearSign Technologies Corporation and VStock Transfer, LLC (incorporated by reference to Exhibit 10.25 of the Company’s Form S-1 filed with the Securities and Exchange Commission on May 20, 2024). Exhibit 10.25 CLEARSIGN TECHNOLOGIES CORPORATION AMENDMENT TO WARRANT AGENCY AGREEMENT This Amendment to the Warrant Agency Agreement (this “Amendment”), dated as of May 15, 2024, is made by and between ClearSign Technologies Corporation, a Delaware corporation (the “Company”), and VStock Transfer, LLC (“VStock”). Unless otherwise defined herein, capitalized terms shall have the meanings assigned
May 15, 2024	10-Q	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 00
May 10, 2024	DEF 14A	SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Table of Contents SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.
May 10, 2024	8-K	Unregistered Sales of Equity Securities, Financial Statements and Exhibits, Other Events 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 10, 2024 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in charter) Delaware 001-35521 26-2056298 (State or other jurisdiction of incorporation) (Commis
May 10, 2024	DEFA14A	SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ⌧ Filed by a Party other than the Registrant ◻ Check the appropriate box: ◻ Preliminary Proxy Statement ◻ Confidential, For Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ◻ Definitive Proxy Statement ⌧ Definitive Additional Materials ◻ Soliciting Material Pursuant to §240.
May 3, 2024	8-K	Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing, Financial Statements and Exhibits, Other Events 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 2, 2024 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in charter) Delaware 001-35521 26-2056298 (State or other jurisdiction of incorporation) (Commiss
April 30, 2024	PRE 14A	SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Table of Contents SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.
April 26, 2024	10-K/A	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K/A (Amendment No. 1) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K/A (Amendment No. 1) (Mark One) x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 OR ¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 001-3
April 25, 2024	8-K	Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events 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): April 23, 2024 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in charter) Delaware 001-35521 26-2056298 (State or other jurisdiction of incorporation) (Comm
April 25, 2024	EX-99.2	Event Name: ClearSign Technologies Full Year 2023 Conference Call Exhibit 99.2 Event Name: ClearSign Technologies Full Year 2023 Conference Call Event Date: Tuesday, April 23, 2024, 5:00 p.m. Eastern Time Officers and Speakers Matthew Selinger; Firm IR Group Brent Hinds; Chief Financial Officer Jim Deller; Chief Executive Officer Analysts Amit Dayal; H.C. Wainwright Presentation Operator: Good afternoon, and welcome to the ClearSign Technologies Fourth Quarter a
April 25, 2024	EX-99.1	ClearSign Technologies Corporation Provides Full Year 2023 Update Exhibit 99.1 ClearSign Technologies Corporation Provides Full Year 2023 Update TULSA, Okla., April 23, 2024 - ClearSign Technologies Corporation (Nasdaq: CLIR) (“ClearSign” or the “Company”), an emerging leader in industrial combustion and sensing technologies that improve energy, operational efficiency and safety while dramatically reducing emissions, today provides an update on operations for th
April 24, 2024	EX-99.2	ClearSign Technologies Corporation Appoints David Maley to Board of Directors Exhibit 99.2 ClearSign Technologies Corporation Appoints David Maley to Board of Directors Tulsa, OK, April 24, 2024 - ClearSign Technologies Corporation (Nasdaq: CLIR) ("ClearSign" or the "Company"), an emerging leader in industrial combustion and sensing technologies that improve energy and operational efficiency, and safety while dramatically reducing emissions, today announces that David Maley
April 24, 2024	EX-10.1	David M. Maley’s Offer Letter, dated April 23, 2024 (incorporated by reference to Exhibit 10.1 to the Company’s Form 8-K filed with the Securities and Exchange Commission on April 24, 2024). Exhibit 10.1 April 23, 2024 Re: Board of Directors of ClearSign Technologies Corporation - Offer Letter Dear David Maley: 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. We look forward to working with you on the Board. Should you choose to accept t
April 24, 2024	EX-99.1	ClearSign Technologies Corporation Announces Closing of $9.3 Million Public Offering and Concurrent Private Placement of Common Stock and Warrants Exhibit 99.1 ClearSign Technologies Corporation Announces Closing of $9.3 Million Public Offering and Concurrent Private Placement of Common Stock and Warrants TULSA, Okla., April, 23, 2024 /PRNewswire/ - ClearSign Technologies Corporation (Nasdaq: CLIR) ("ClearSign" or the "Company"), an emerging leader in industrial combustion and sensing technologies that improve energy, operational efficiency
April 24, 2024	8-K	Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Other Events 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): April 23, 2024 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in Charter) Delaware 001-35521 26-2056298 (State or other jurisdiction of incorporation) (Comm
April 23, 2024	EX-4.1	Form of Pre-Funded Warrant (incorporated by reference to Exhibit 4.1 of the Company’s Form 8-K filed with the Securities and Exchange Commission on April 23, 2024). Exhibit 4.1 NEITHER THIS SECURITY NOR THE SECURITIES FOR WHICH THIS SECURITY IS EXERCISABLE HAVE BEEN REGISTERED WITH THE SECURITIES AND EXCHANGE COMMISSION OR THE SECURITIES COMMISSION OF ANY STATE IN RELIANCE UPON AN EXEMPTION FROM REGISTRATION UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), AND, ACCORDINGLY, MAY NOT BE OFFERED OR SOLD EXCEPT PURSUANT TO AN EFFECTIVE REGISTR
April 23, 2024	EX-10.1	Amendment to Securities Purchase Agreement, dated as of April 22, 2024 (incorporated by reference to Exhibit 10.1 to the Company’s Form 8-K filed with the Securities and Exchange Commission on April 23, 2024). Exhibit 10.1 CLEARSIGN TECHNOLOGIES CORPORATION AMENDMENT TO SECURITIES PURCHASE AGREEMENT This Amendment to the Securities Purchase Agreement (this “Amendment”), dated as of April 22, 2024, is made by and between ClearSign Technologies Corporation, a Delaware corporation (the “Company”), and Andrew Schwartzberg, an individual (the “Purchaser”). Unless otherwise defined herein, capitalized terms s
April 23, 2024	424B5	4,620,760 Shares of Common Stock and Redeemable Warrants to Purchase up to 4,620,760 Shares of Common Stock Filed Pursuant to Rule 424(b)(5) Registration No. 333-265967 PROSPECTUS SUPPLEMENT (To Prospectus Dated August 12, 2022) 4,620,760 Shares of Common Stock and Redeemable Warrants to Purchase up to 4,620,760 Shares of Common Stock We are offering 4,620,760 shares of our common stock and 4,620,760 redeemable warrants (the “warrants”) to purchase up to 4,620,760 shares of our common stock pursuant to
April 23, 2024	8-K	Entry into a Material Definitive Agreement, Unregistered Sales of Equity Securities, Financial Statements and Exhibits 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): April 22, 2024 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in Charter) Delaware 001-35521 26-2056298 (State or other jurisdiction of incorporation) (Comm
April 19, 2024	EX-4.2	Form of Underwriter’s Warrant (incorporated by reference to Exhibit 4.2 of the Company’s Form 8-K filed with the Securities and Exchange Commission on April 19, 2024). Exhibit 4.2 THIS WARRANT AND THE SECURITIES ISSUABLE UPON EXERCISE HEREOF HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), OR ANY OTHER SECURITIES LAWS AND MAY NOT BE OFFERED FOR SALE, SOLD, TRANSFERRED, PLEDGED OR HYPOTHECATED IN THE ABSENCE OF (1) AN EFFECTIVE REGISTRATION STATEMENT COVERING SUCH SECURITIES UNDER THE SECURITIES ACT AND ANY OTHER APPLI
April 19, 2024	EX-10.4	Securities Purchase Agreement, dated as of April 19, 2024 (incorporated by reference to Exhibit 10.4 to the Company’s Form 8-K filed with the Securities and Exchange Commission on April 19, 2024). Exhibit 10.4 SECURITIES PURCHASE AGREEMENT This Securities Purchase Agreement (this “Agreement”) is dated as of April 19, 2024, between ClearSign Technologies Corporation, a Delaware corporation (the “Company”), and each purchaser identified on the signature pages hereto (each, including its successors and assigns, a “Purchaser” and collectively the “Purchasers”). WHEREAS, subject to the terms and
April 19, 2024	EX-4.3	Form of Private Warrant (incorporated by reference to Exhibit 4.3 of the Company’s Form 8-K filed with the Securities and Exchange Commission on April 19, 2024). Exhibit 4.3 NEITHER THIS SECURITY NOR THE SECURITIES FOR WHICH THIS SECURITY IS EXERCISABLE HAVE BEEN REGISTERED WITH THE SECURITIES AND EXCHANGE COMMISSION OR THE SECURITIES COMMISSION OF ANY STATE IN RELIANCE UPON AN EXEMPTION FROM REGISTRATION UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), AND, ACCORDINGLY, MAY NOT BE OFFERED OR SOLD EXCEPT PURSUANT TO AN EFFECTIVE REGISTR
April 19, 2024	8-K	Regulation FD Disclosure, Entry into a Material Definitive Agreement, Unregistered Sales of Equity Securities, Financial Statements and Exhibits 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): April 19, 2024 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in Charter) Delaware 001-35521 26-2056298 (State or other jurisdiction of incorporation) (Comm
April 19, 2024	EX-10.2	Form of Lock-Up Agreement (directors and officers) (incorporated by reference to Exhibit 10.2 to the Company’s Form 8-K filed with the Securities and Exchange Commission on April 19, 2024). Exhibit 10.2 Form of Lock-Up Agreement – ClearSign Technologies Corporation (Directors and Officers) , 2024 Public Ventures, LLC 14135 Midway Road, Suite G150 Addison, TX 75001 Ladies and Gentlemen: The undersigned understands that Public Ventures, LLC (the “Underwriter”) proposes to enter into an Underwriting Agreement (the “Underwriting Agreement”) with ClearSign Technologies Corporation, a Dela
April 19, 2024	EX-10.1	Form of Warrant Agency Agreement, by and between ClearSign Technologies Corporation and VStock Transfer, LLC (incorporated by reference to Exhibit 10.1 of the Company’s Form 8-K filed with the Securities and Exchange Commission on April 19, 2024). Exhibit 10.1 CLEARSIGN TECHNOLOGIES CORPORATION and VStock Transfer, LLC, as Warrant Agent Warrant Agency Agreement Dated as of April , 2024 WARRANT AGENCY AGREEMENT WARRANT AGENCY AGREEMENT, dated as of April , 2024 (“Agreement”), by and between ClearSign Technologies Corporation, a Delaware corporation (the “Company”), and VStock Transfer, LLC, a New York limited liability trust company (“VStock
April 19, 2024	EX-4.4	Form of Placement Agent Warrant (incorporated by reference to Exhibit 4.4 of the Company’s Form 8-K filed with the Securities and Exchange Commission on April 19, 2024). Exhibit 4.4 THIS WARRANT AND THE SECURITIES ISSUABLE UPON EXERCISE HEREOF HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), OR ANY OTHER SECURITIES LAWS AND MAY NOT BE OFFERED FOR SALE, SOLD, TRANSFERRED, PLEDGED OR HYPOTHECATED IN THE ABSENCE OF (1) AN EFFECTIVE REGISTRATION STATEMENT COVERING SUCH SECURITIES UNDER THE SECURITIES ACT AND ANY OTHER APPLI
April 19, 2024	EX-1.1	Underwriting Agreement, dated April 19, 2024, by and between ClearSign Technologies Corporation and Public Ventures, LLC, as Representative of the Underwriters (incorporated by reference to Exhibit 1.1 to the Company’s Form 8-K filed with the Securities and Exchange Commission on April 19, 2024). Exhibit 1.1 4,620,760 SHARES of Common Stock and 4,620,760 warrants to purchase Shares of Common Stock CLEARSIGN TECHNOLOGIES CORPORATION UNDERWRITING AGREEMENT April 19, 2024 Public Ventures, LLC 14135 Midway Road, Suite G-150 Addison, TX 75001 Ladies and Gentlemen: The undersigned, ClearSign Technologies Corporation, a company incorporated under the laws of Delaware (the “Company”), hereby confi
April 19, 2024	EX-4.1	Form of Common Warrant (incorporated by reference to Exhibit 4.1 of the Company’s Form 8-K filed with the Securities and Exchange Commission on April 19, 2024) Exhibit 4.1 REDEEMABLE COMMON STOCK PURCHASE WARRANT clearsign technologies Corporation Warrant Shares: Initial Exercise Date: , 2024 THIS REDEEMABLE COMMON STOCK PURCHASE WARRANT (the “Warrant”) certifies that, for value received, or its assigns (the “Holder”) is entitled, upon the terms and subject to the limitations on exercise and the conditions hereinafter set forth, at any time on or after t
April 19, 2024	EX-10.3	Form of Lock-Up Agreement (5% or greater stockholder) (incorporated by reference to Exhibit 10.3 to the Company’s Form 8-K filed with the Securities and Exchange Commission on April 19, 2024). Exhibit 10.3 Form of Lock-Up Agreement – ClearSign Technologies Corporation (clirSPV, LLC) , 2024 Public Ventures, LLC 14135 Midway Road, Suite G150 Addison, TX 75001 Ladies and Gentlemen: The undersigned understands that Public Ventures, LLC (the “Underwriter”) proposes to enter into an Underwriting Agreement (the “Underwriting Agreement”) with ClearSign Technologies Corporation, a Delaware corpo
April 19, 2024	424B5	SUBJECT TO COMPLETION PRELIMINARY PROSPECTUS SUPPLEMENT NO. 2, DATED APRIL 19, 2024 Filed Pursuant to Rule 424(b)(5) Registration No. 333-265967 The information in this preliminary prospectus supplement is not complete and may be changed. Neither this preliminary prospectus supplement nor the accompanying prospectus is an offer to sell these securities, and we are not soliciting an offer to buy these securities, in any jurisdiction where the offer or sale is not permitted. SUBJEC
April 19, 2024	EX-99.1	ClearSign Technologies Corporation Announces Pricing of $9.3 Million Public Offering and Concurrent Private Placement of Common Stock and Warrants Exhibit 99.1 ClearSign Technologies Corporation Announces Pricing of $9.3 Million Public Offering and Concurrent Private Placement of Common Stock and Warrants TULSA, Okla., April, 19, 2024 /PRNewswire/ - ClearSign Technologies Corporation (Nasdaq: CLIR) ("ClearSign" or the "Company"), an emerging leader in industrial combustion and sensing technologies that improve energy, operational efficiency
April 1, 2024	S-8	As filed with the U.S. Securities and Exchange Commission on April 1, 2024 As filed with the U.S. Securities and Exchange Commission on April 1, 2024 Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 ClearSign Technologies Corporation (Exact name of Registrant as specified in its charter) Delaware 26-2056298 (State or other jurisdiction of incorporation or organiz
April 1, 2024	10-K	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 001-355
April 1, 2024	EX-97	Clawback Policy. Exhibit 97 CLEARSIGN TECHNOLOGIES CORPORATION CLAWBACK POLICY 1. Introduction The Board of Directors (the “Board”) of ClearSign Technologies Corporation (the “Company”) believes that it is in the best interests of the Company and its stockholders to adopt this Clawback Policy (this “Policy”), which provides for the recoupment of certain executive compensation in the event of an accounting restatem
April 1, 2024	EX-FILING FEES	Filing Fee Table. Exhibit 107 Calculation of Filing Fee Table Form S-8 (Form Type) ClearSign Technologies Corporation (Exact Name of Registrant as Specified in its Charter) Newly Registered Securities Security Type Security Class Title Fee Calculation Rule Amount Registered(1) Proposed Maximum Offering Price Per Unit(3) Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Equity Common Stock, $0.
April 1, 2024	EX-4.1	Exhibit 4.1 DESCRIPTION OF SECURITIES General The following summary of certain material terms of the securities of ClearSign Technologies Corporation (the “Company,” “we,” “us” or “our”) is not intended to be a complete summary of the rights and preferences of such securities.
March 19, 2024	FWP	Filed Pursuant to Rule 433 of the Securities Act of 1933 Filed Pursuant to Rule 433 of the Securities Act of 1933 Issuer Free Writing Prospectus dated March 19, 2024 Registration Statement No.
March 18, 2024	424B5	March 18, 2024 Filed pursuant to Rule 424(b)(5) Registration No. 333-265967 PROSPECTUS SUPPLEMENT (To the Prospectus dated August 12, 2022) We previously entered into an At-the-Market Sales Agreement (the “Sales Agreement”) with Virtu Americas LLC (“Virtu”), dated December 23, 2020, relating to the sales of shares of our common stock, par value $0.0001 per share, offered by the Prospectus (as defined below). In
March 18, 2024	424B5	SUBJECT TO COMPLETION PRELIMINARY PROSPECTUS SUPPLEMENT, DATED MARCH 18, 2024 Filed Pursuant to Rule 424(b)(5) Registration No. 333-265967 The information in this preliminary prospectus supplement is not complete and may be changed. Neither this preliminary prospectus supplement nor the accompanying prospectus is an offer to sell these securities, and we are not soliciting an offer to buy these securities, in any jurisdiction where the offer or sale is not permitted. SUBJEC
February 7, 2024	8-K	Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition 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): February 7, 2024 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in Charter) Delaware 001-35521 26-2056298 (State or other jurisdiction of incorporation) (Co
February 7, 2024	EX-99.1	ClearSign Technologies Corporation Provides Preliminary 2023 Financial Results Company Expects Revenues of Approximately $1.2MM During Fourth Quarter of 2023 (Unaudited) Exhibit 99.1 ClearSign Technologies Corporation Provides Preliminary 2023 Financial Results Company Expects Revenues of Approximately $1.2MM During Fourth Quarter of 2023 (Unaudited) TULSA, Okla., February 7, 2024 - ClearSign Technologies Corporation (Nasdaq: CLIR) (“ClearSign” or the “Company”), an emerging leader in industrial combustion and sensing technologies that improve energy, operational
February 5, 2024	SC 13D/A	CLIR / ClearSign Technologies Corporation / clirSPV LLC - SCHEDULE 13D/A - AMENDMENT NO. 3 Activist Investment SC 13D/A 1 ctc-sc13daamend3.htm SCHEDULE 13D/A - AMENDMENT NO. 3 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 3)* ClearSign Technologies Corporation (Name of Issuer) Common Stock (Title of Class of Securities) 185064102 (CUSIP Number) Robert T. Hoffman Sr. c/o clirSPV LLC 119 Warren Avenue, 3rd Floor S
January 5, 2024	8-K	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): December 30, 2023 CLEARSIGN TECHN 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): December 30, 2023 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in its charter) Delaware 001-35521 26-2056298 (State or other jurisdiction of incorporation
November 27, 2023	8-K	Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing, Financial Statements and Exhibits 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): November 24, 2023 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in Charter) Delaware 001-35521 26-2056298 (State or other jurisdiction of incorporation) (C
November 15, 2023	EX-99.2	[CLIR] ClearSign Technologies Q3 2023 Earnings Conference Call Tuesday, November 14, 2023, 5:00 PM ET. Exhibit 99.2 [CLIR] ClearSign Technologies Q3 2023 Earnings Conference Call Tuesday, November 14, 2023, 5:00 PM ET. Officers and Speakers Matthew Selinger, Firm IR Group Brent Hinds, Chief Financial Officer Jim Deller, Chief Executive Officer Analysts Eric Gruskin, Private Investor Robert Kecseg, Las Colinas Capital Management Jeff Feinglas, Private Investor Brad Van Dooker, Private Investor Prese
November 15, 2023	8-K	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): November 14, 2023 CLEARSIGN TECHN 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): November 14, 2023 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in Charter) Delaware 001-35521 26-2056298 (State or other jurisdiction of incorporation) (C
November 15, 2023	EX-99.1	ClearSign Technologies Corporation Provides Third Quarter 2023 Update Exhibit 99.1 ClearSign Technologies Corporation Provides Third Quarter 2023 Update TULSA, Okla., November 14, 2023 - ClearSign Technologies Corporation (Nasdaq: CLIR) ("ClearSign" or the "Company"), an emerging leader in industrial combustion and sensing technologies that improve energy, operational efficiency and safety while dramatically reducing emissions, today provides an update on operations
November 14, 2023	10-Q	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Numbe
September 22, 2023	EX-99.1	ClearSign Technologies Corporation Receives Support and Collaboration from SoCalGas for its Flexible Hydrogen Fueled Ultra Low NOx Process Burner Project Exhibit 99.1 ClearSign Technologies Corporation Receives Support and Collaboration from SoCalGas for its Flexible Hydrogen Fueled Ultra Low NOx Process Burner Project TULSA, Okla., September 20, 2023 - ClearSign Technologies Corporation (Nasdaq: CLIR) ("ClearSign" or the "Company"), an emerging leader in industrial combustion and sensing technologies that improve energy, operational efficiency and
September 22, 2023	8-K	Financial Statements and Exhibits, Other Events 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): September 20, 2023 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in Charter) Delaware 001-35521 26-2056298 (State or other jurisdiction of incorporation) (
September 1, 2023	424B3	2,246,019 shares of common stock Filed Pursuant to Rule 424(b)(3) Registration No. 333-273927 PROSPECTUS 2,246,019 shares of common stock This prospectus relates to the offer and sale from time to time by the selling stockholder named in this prospectus (the “Selling Stockholder”) of up to 2,246,019 shares (the “Shares”) of common stock, par value $0.0001 per share, of ClearSign Technologies Corporation, a Delaware corporation (t
September 1, 2023	EX-99.1	ClearSign Technologies Corporation Provides Second Quarter 2023 Update Exhibit 99.1 ClearSign Technologies Corporation Provides Second Quarter 2023 Update TULSA, Okla., August 31, 2023 - ClearSign Technologies Corporation (Nasdaq: CLIR) ("ClearSign" or the "Company"), an emerging leader in industrial combustion and sensing technologies that improve energy, operational efficiency and safety while dramatically reducing emissions, today provides an update on operations
September 1, 2023	EX-99.2	Event Name: ClearSign Technologies Second Quarter 2023 Conference Call Exhibit 99.2 Event Name: ClearSign Technologies Second Quarter 2023 Conference Call Event Date: Thursday, August 31, 2023, 5:00 PM Eastern Time Officers and Speakers Matthew Selinger; Firm IR Group Brent Hinds; VP of Finance and Controller Jim Deller; President and Chief Executive Officer Analysts Sameer Joshi; H.C. Wainwright Robert Kecseg; Las Colinas Capital Management Kevin Dunn; Private Inves
September 1, 2023	8-K	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): August 31, 2023 CLEARSIGN TECHNOL 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): August 31, 2023 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in Charter) Delaware 001-35521 26-2056298 (State or other jurisdiction of incorporation) (Com
August 29, 2023	8-K	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): August 29, 2023 CLEARSIGN TECHNOL 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): August 29, 2023 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in Charter) Delaware 001-35521 26-2056298 (State or other jurisdiction of incorporation) (Com
August 29, 2023	EX-99.1	ClearSign Technologies Corporation Awarded Phase 2 Grant from Department of Energy to Commercialize a Flexible Hydrogen Fueled Ultra Low NOx Process Burner Exhibit 99.1 ClearSign Technologies Corporation Awarded Phase 2 Grant from Department of Energy to Commercialize a Flexible Hydrogen Fueled Ultra Low NOx Process Burner TULSA, Okla., August 29, 2023 - ClearSign Technologies Corporation (Nasdaq: CLIR) ("ClearSign" or the "Company"), an emerging leader in industrial combustion and sensing technologies that improve energy, operational efficiency and
August 14, 2023	EX-10.1	Form of Director and Officer Indemnification Agreement (incorporated by reference to Exhibit 10.1 to the Company’s Form 10-Q filed with the Securities and Exchange Commission on August 14, 2023). Exhibit 10.1 INDEMNIFICATION AGREEMENT This Indemnification Agreement (“Agreement”), dated as of the Effective Date, is entered by and between ClearSign Technologies Corporation, a Delaware corporation (the “Company”), and (“Indemnitee”). This Agreement supersedes and replaces any and all previous Agreements between the Company and Indemnitee covering the subject matter of this Agreement. RECITALS
August 14, 2023	8-A12B/A	Form 8-A/A, filed with the SEC on August 14, 2023 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-A/A (Amendment No. 2) FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in its charter) Delaware 26-2056298 (State of incorporation or organization) (I.R.S. Employer Identific
August 14, 2023	EX-10.2	Amendment to Offer Letter between the Company and Brent Hinds, dated August 8, 2023 (incorporated by reference to the Company’s Form 10-Q filed with the Securities and Exchange Commission on August 14, 2023). Exhibit 10.2
August 14, 2023	EX-99.2	Corporate Presentation, dated August 2023 Exhibit 99.2 Corporate Presentation August 2023 NASDAQ: CLIR Commercializing Innovative Combustion & Sensing Technologies 2 Safe Harbor Statement This presentation is made solely for informational purposes and no representation or warranty, express or implied, is made by ClearSign Technologies Corporation (“ClearSign,” “we,” “us,” “our,” and, together with our subsidiaries, the “Company”) or any o
August 14, 2023	10-Q	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 001
August 14, 2023	EX-99.1	Press Release, dated August 8, 2023 Exhibit 99.1 ClearSign Technologies Corporation Announces Promotion of Brent Hinds to Chief Financial Officer TULSA, Okla., August 8, 2023 — ClearSign Technologies Corporation (Nasdaq: CLIR) (“ClearSign” or the “Company”), an emerging leader in industrial combustion and sensing technologies that improve energy, operational efficiency and safety while dramatically reducing emissions, announces that
August 11, 2023	S-3	As filed with the U.S. Securities and Exchange Commission on August 11, 2023 As filed with the U.S. Securities and Exchange Commission on August 11, 2023 Registration Statement No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-3 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in its charter) Delaware 26-2056298 (State or other jurisdiction of incorporatio
August 11, 2023	8-A12B/A	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-A/A (Amendment No. 1) FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 CLEARSIGN TECHNOLOGIES CORP UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-A/A (Amendment No. 1) FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in its charter) Delaware 26-2056298 (State of incorporation or organization) (I.R.S. Employer Identific
August 11, 2023	EX-FILING FEES	Filing Fee Table Exhibit 107 Calculation of Filing Fee Tables Form S-3 (Form Type) ClearSign Technologies Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered(1) Proposed Maximum Offering Price Per Unit(2) Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Fees to Be Paid Equity Common stock, $0.
August 11, 2023	EX-4.1	Form of Common Stock Certificate Exhibit 4.1 NUMBER SHARES CERT.9999 Incorporated under the laws of Delaware *****9,000,000,000***** COMMON STOCK CUSIP 999999ZZ9 THIS CERTIFIES THAT * SPECIMEN * Is The Owner of * NINE BILLION AND 00/100 * FULLY PAID AND NON-ASSESSABLE SHARES OF COMMON STOCK OF ClearSign Technologies Corporation transferable on the books of the Corporation by the holder hereof, in person or by duly authorized
June 15, 2023	EX-99.1	Youâve Exceeded the SECâs Traffic Limit U.S. Securities and Exchange Commission Youâve Exceeded the SECâs Traffic Limit Your request rate has exceeded the SECâs maximum allowable requests per second. Your access to SEC.gov will be limited for 10 minutes. Current guidelines limit each user to a total of no more than 10 requests per second, regardless of the number of machines used to submit requests. To ensure that SEC.gov remains
June 15, 2023	EX-3.3	Certificate of Incorporation of ClearSign Technologies Corporation, a Delaware corporation (incorporated by reference to Exhibit 3.3 of the Company’s Form 8-K filed with the Securities and Exchange Commission on June 15, 2023). Exhibit 3.3 CERTIFICATE OF INCORPORATION OF CLEARSIGN TECHNOLOGIES CORPORATION The undersigned, a corporation organized and existing under the laws of the State of Delaware adopts the following Certificate of Incorporation: ARTICLE I. The name of the corporation is ClearSign Technologies Corporation (the “Corporation”). ARTICLE II. The address of the Corporation’s registered office in the State of
June 15, 2023	EX-3.1	Certificate of Conversion, as filed with the Secretary of State of the State of Delaware on June 14, 2023 (incorporated by reference to Exhibit 3.1 to the Company’s Form 8-K filed with the Securities and Exchange Commission on June 15, 2023). Exhibit 3.1 CERTIFICATE OF CONVERSION OF CLEARSIGN TECHNOLOGIES CORPORATION (a Washington corporation) to CLEARSIGN TECHNOLOGIES CORPORATION (a Delaware corporation) Pursuant to Section 265 of the Delaware General Corporation Law 1) The jurisdiction where the non-Delaware Corporation first formed is: Washington. 2) The jurisdiction immediately prior to filing this Certificate of Conversion is: Was
June 15, 2023	EX-3.4	Bylaws of ClearSign Technologies Corporation, a Delaware corporation (incorporated by reference to Exhibit 3.4 to the Company’s Form 8-K filed with the Securities and Exchange Commission on June 15, 2023). Exhibit 3.4 BYLAWS OF CLEARSIGN TECHNOLOGIES CORPORATION (THE “CORPORATION”) ARTICLE I OFFICES Section 1.1. Registered Office. The address of the Corporation’s registered office in the State of Delaware is 2140 South Dupont Hwy, Camden, DE 19934, and the name of the Corporation’s registered agent at such address is Parasec. ARTICLE II STOCKHOLDERS MEETINGS Section 2.1 Annual Meetings. The annual m
June 15, 2023	EX-2.1	Plan of Conversion, dated June 14, 2023 (incorporated by reference to Exhibit 2.1 to the Company’s Form 8-K filed with the Securities and Exchange Commission on June 15, 2023). U.S. Securities and Exchange Commission Youâve Exceeded the SECâs Traffic Limit Your request rate has exceeded the SECâs maximum allowable requests per second. Your access to SEC.gov will be limited for 10 minutes. Current guidelines limit each user to a total of no more than 10 requests per second, regardless of the number of machines used to submit requests. To ensure that SEC.gov remains
June 15, 2023	EX-3.2	Articles of Conversion, as filed with the Secretary of State of the State of Washington on June 14, 2023 (incorporated by reference to Exhibit 3.2 to the Company’s Form 8-K filed with the Securities and Exchange Commission on June 15, 2023). Exhibit 3.2 ARTICLES OF ENTITY CONVERSION OF CLEARSIGN TECHNOLOGIES CORPORATION (a Washington corporation) to CLEARSIGN TECHNOLOGIES CORPORATION (a Delaware corporation) Pursuant to the applicable provisions of the Revised Code of Washington (“RCW”), the undersigned corporation hereby executes the following Articles of Entity Conversion: 1. Name of Entity.             The name of the converted ent
June 15, 2023	8-K	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): June 14, 2023 CLEARSIGN TECHNOLOGIES CORPORATIO 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): June 14, 2023 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in Charter) Washington 001-35521 26-2056298 (State or other jurisdiction of incorporation) (Commission File N
June 8, 2023	8-K	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): June 6, 2023 CLEARSIGN TECHNOLOGIES CORPORATION 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): June 6, 2023 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in Charter) Washington 001-35521 26-2056298 (State or other jurisdiction of incorporation) (Commission File No
May 30, 2023	8-K	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 25, 2023 CLEARSIGN TECHNOLOGIES CORPORATION 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 25, 2023 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in Charter) Washington 001-35521 26-2056298 (State or other jurisdiction of incorporation) (Commission File No
May 30, 2023	EX-99.1	ClearSign Technologies Corporation Regains Compliance with Nasdaq Listing Requirements Exhibit 99.1 ClearSign Technologies Corporation Regains Compliance with Nasdaq Listing Requirements Tulsa, OK., May 30, 2023–ClearSign Technologies Corporation (Nasdaq: CLIR) (“ClearSign” or the “Company”), an emerging leader in industrial combustion and sensing technologies that improve energy, operational efficiency and safety while dramatically reducing emissions, today announced that it has re
May 24, 2023	EX-99.1	ClearSign Technologies Corporation Provides First Quarter 2023 Update Exhibit 99.1 ClearSign Technologies Corporation Provides First Quarter 2023 Update TULSA, Okla., May 18, 2023 - ClearSign Technologies Corporation (Nasdaq: CLIR) ("ClearSign" or the "Company"), an emerging leader in industrial combustion and sensing technologies that improve energy, operational efficiency and safety while dramatically reducing emissions, today provides an update on operations for
May 24, 2023	8-K	Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition 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 18, 2023 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in Charter) Washington 001-35521 26-2056298 (State or other jurisdiction of incorporation) (Commission File No
May 24, 2023	EX-99.2	Event Name: ClearSign Technologies First Quarter 2023 Conference Call Exhibit 99.2 Event Name: ClearSign Technologies First Quarter 2023 Conference Call Event Date: Thursday, May 18, 2023, 5:00 PM Eastern Time Officers and Speakers Matthew Selinger; Firm IR Group Brent Hinds; VP of Finance and Controller Jim Deller; President and Chief Executive Officer Analysts Amit Dayal; H.C. Wainwright Mark Gronit; Private Investor Robert Kecseg; Las Colinas Capital Management P
May 15, 2023	10-Q	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 00
May 2, 2023	8-K	Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing, Financial Statements and Exhibits 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 2, 2023 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in Charter) Washington 001-35521 26-2056298 (State or other jurisdiction of incorporation) (Commission File No.
April 25, 2023	DEF 14A	our Definitive Proxy Statement on Schedule 14A for our 2023 annual meeting of stockholders, filed with the SEC on April 25, 2023, to the extent incorporated by reference into the Form 10-K; and Table of Contents SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.
April 25, 2023	DEFA14A	SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ⌧ Filed by a Party other than the Registrant ◻ Check the appropriate box: ◻ Preliminary Proxy Statement ◻ Confidential, For Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ◻ Definitive Proxy Statement ⌧ Definitive Additional Materials ◻ Soliciting Material Pursuant to §240.
April 14, 2023	PRE 14A	SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Table of Contents SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.
April 7, 2023	EX-99.1	ClearSign Technologies Corporation Provides Full Year 2022 Update Exhibit 99.1 ClearSign Technologies Corporation Provides Full Year 2022 Update TULSA, Okla., April 6, 2023 - ClearSign Technologies Corporation (Nasdaq: CLIR) ("ClearSign" or the "Company"), an emerging leader in industrial combustion and sensing technologies that improve energy, operational efficiency and safety while dramatically reducing emissions, today provides an update on operations for the
April 7, 2023	8-K	Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition 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): April 6, 2023 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in Charter) Washington 001-35521 26-2056298 (State or other jurisdiction of incorporation) (Commission File N
April 7, 2023	EX-99.2	[CLIR] ClearSign Technologies Q4 and FY2022 Conference Call Thursday, April 6, 2023, 5:00 PM ET. EX-99.2 3 tm2312141d1ex99-2.htm EXHIBIT 99.2 Exhibit 99.2 [CLIR] ClearSign Technologies Q4 and FY2022 Conference Call Thursday, April 6, 2023, 5:00 PM ET. Officers and Speakers Matthew Selinger, Firm IR Group Brent Hinds, VP of Finance and Controller Jim Deller, President and Chief Executive Officer Analysts Amit Dayal, H.C. Wainwright Robert Kecseg, Las Colinas Capital Management Jeff Feinglas, P
March 31, 2023	EX-FILING FEES	Filing Fee Table (filed herewith) EXHIBIT 107 Calculation of Filing Fee Table Form S-8 (Form Type) ClearSign Technologies Corporation (Exact Name of Registrant as Specified in its Charter) Newly Registered Securities Security Type Security Class Title Fee Calculation Rule Amount Registered(1) Proposed Maximum Offering Price Per Unit(3) Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Equity Common Stock, $0.
March 31, 2023	S-8	As filed with the U.S. Securities and Exchange Commission on March 31, 2023 As filed with the U.S. Securities and Exchange Commission on March 31, 2023 Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 ClearSign Technologies Corporation (Exact name of Registrant as specified in its charter) Washington 26-2056298 (State or other jurisdiction of incorporation or orga
March 31, 2023	10-K	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 001-355
February 24, 2023	EX-10.1	Catharine de Lacy’s Offer Letter, dated February 20, 2023 (incorporated by reference to Exhibit 10.1 to the Company’s Form 8-K filed with the Securities and Exchange Commission on February 24, 2023). Exhibit 10.1 February 20th, 2023 Catharine de Lacy Re: Board of Directors of ClearSign Technologies Corporation - Offer Letter Dear Catharine de Lacy: 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. We look forward to working with you on the Board.
February 24, 2023	8-K	Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits 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): February 18, 2023 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in Charter) Washington 001-35521 26-2056298 (State or other jurisdiction of incorporation or organization
February 24, 2023	EX-99.1	ClearSign Technologies Corporation Announces Board Transitions Exhibit 99.1 ClearSign Technologies Corporation Announces Board Transitions Tulsa, OK, February 23, 2023 - ClearSign Technologies Corporation (Nasdaq: CLIR) ("ClearSign" or the "Company"), an emerging leader in industrial combustion and sensing technologies that improve energy and operational efficiency, and safety while dramatically reducing emissions, today announces that Susanne Meline is stepp
December 9, 2022	EX-99.1	Event Name: [ CLIR ] - ClearSign Technologies Third Quarter 2022 Conference Call Exhibit 99.1 Event Name: [ CLIR ] - ClearSign Technologies Third Quarter 2022 Conference Call Event Date: Thursday, December 1, 2022, 5:00 PM Eastern Time Officers and Speakers Matthew Selinger; Firm IR Group Brent Hinds; VP of Finance Jim Deller; President and Chief Executive Officer Analysts Sameer Joshi; H.C. Wainwright Jeff Feinglass; Private Investor Presentation Operator: Hello and welcome t
December 9, 2022	8-K	Regulation FD Disclosure, Financial Statements and Exhibits 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): December 1, 2022 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in Charter) Washington 001-35521 26-2056298 (State or other jurisdiction of incorporation) (Commission Fil
November 14, 2022	10-Q	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2022 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Numbe
November 4, 2022	8-K	Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing, Financial Statements and Exhibits 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): November 1, 2022 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in its charter) Washington 001-35521 26-2056298 (State or other jurisdiction of incorporatio
September 6, 2022	EX-99.2	Event Name: [ CLIR ] - ClearSign Technologies Second Quarter 2022 Conference Call Exhibit 99.2 Event Name: [ CLIR ] - ClearSign Technologies Second Quarter 2022 Conference Call Event Date: Thursday, September 1, 2022, 5:00 PM Eastern Time Officers and Speakers Matthew Selinger; Firm IR Group Brent Hinds; VP of Finance Jim Deller; President and Chief Executive Officer Analysts Amit Dayal; H.C. Wainwright Robert Kecseg; Las Colinas Capital Management Presentation Operator: Good d
September 6, 2022	EX-99.1	ClearSign Technologies Corporation Provides Second Quarter 2022 Update Exhibit 99.1 ClearSign Technologies Corporation Provides Second Quarter 2022 Update TULSA, Okla., September 1, 2022 - ClearSign Technologies Corporation (Nasdaq: CLIR) ("ClearSign" or the "Company"), an emerging leader in industrial combustion and sensing technologies that improve energy, operational efficiency and safety while dramatically reducing emissions, today provides an update on operation
September 6, 2022	8-K	Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition 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): September 1, 2022 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in Charter) Washington 001-35521 26-2056298 (State or other jurisdiction of incorporation o
August 15, 2022	EX-10.1	Amendment to Employment Agreement between the Company and Colin James Deller (incorporated by reference to Exhibit 10.1 to the Company’s Form 10-Q filed with the Securities and Exchange Commission on August 15, 2022). Exhibit 10.1 AMENDMENT TO EMPLOYMENT AGREEMENT ? This AMENDMENT TO EMPLOYMENT AGREEMENT (this ?Amendment?) is entered into as of May 11, 2022, between ClearSign Technologies Corporation, a Washington corporation (the ?Company?), and Colin James Deller (?Executive?). WHEREAS, the Company and Executive entered into that certain Employment Agreement, dated January 28, 2019 (the ?Employment Agreement?
August 15, 2022	10-Q	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.
August 10, 2022	CORRESP	ClearSign Technologies Corporation – 8023 East 63rd Place, Suite 101, Tulsa, Oklahoma 74133 – Tel: 206.673.4848 – www.clearsign.com CORRESP 1 filename1.htm August 10, 2022 U.S. Securities and Exchange Commission Division of Corporation Finance 100 F Street, N.E. Washington, D.C. 20549 RE: ClearSign Technologies Corporation Registration Statement on Form S-3 Filed July 1, 2022 File No. 333-265967 Acceleration Request Requested Date: Friday, August 12, 2022 Requested Time: 5:00 p.m. Eastern Time Ladies and Gentlemen: In accordan
August 2, 2022	EX-10.1	Gary DiElsi’s Offer Letter Exhibit 10.1 July 28, 2022 Gary J. DiElsi 18 Pierrepont Drive Ridgefield, CT 06877 Re: Board of Directors of ClearSign Technologies Corporation - Offer Letter Dear Gary: 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. We look forward to working with
August 2, 2022	8-K	Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits 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): July 28, 2022 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in Charter) Washington 001-35521 26-2056298 (State or other jurisdiction of incorporation or organization) (C
July 29, 2022	S-3/A	As filed with the Securities and Exchange Commission on July 29, 2022 Table of Contents As filed with the Securities and Exchange Commission on July 29, 2022 ? Registration No.
July 19, 2022	CORRESP	ClearSign Technologies Corp. 8023 East 63rd Place, Suite 101 Tulsa, OK 74133 ClearSign Technologies Corp. 8023 East 63rd Place, Suite 101 Tulsa, OK 74133 VIA EDGAR July 19, 2022 U.S. Securities & Exchange Commission Division of Corporation Finance Office of Life Sciences 100 F Street, NE Washington, D.C. 20549 Attn: Tyler Howes Christine Westbrook Re: ClearSign Technologies Corp. Registration Statement on Form S-3 Filed July 1, 2022 File No. 333-265967 Ladies and Gentlemen
July 18, 2022	EX-1	JOINT FILING AGREEMENT Exhibit 1 JOINT FILING AGREEMENT In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, the undersigned agree to the joint filing on behalf of each of them of a statement on Schedule 13D, including all amendments thereto, with respect to the common stock, par value $0.
July 18, 2022	SC 13D/A	CLIR / ClearSign Combustion Corp / clirSPV LLC - FORM SC 13D/A Activist Investment United States Securities and Exchange Commission Washington, D.C. 20549 SCHEDULE 13D (Rule 13d-101) Information to be Included in Statements Filed Pursuant to ? 240.13d-1(a) and Amendments Thereto Filed Pursuant to ? 240.13d-2(a) Under the Securities Exchange Act of 1934 (Amendment No. 2)* ClearSign Technologies Corporation (Name of Issuer) Common Stock (Title of Class of Securities) 185064102 (CU
July 18, 2022	EX-2	clirSPV LLC May 26, 2022 Exhibit 2 clirSPV LLC May 26, 2022 Board of Directors ClearSign Technologies Corporation Re: Waiver of Notice Requirement and Participation Right Ladies and Gentlemen: Pursuant to Section 2 of Appendix IV of that certain Stock Purchase Agreement (the "Agreement") entered into on July 12, 2018 between ClearSign Technologies Corporation (the "Company") and clirSPV LLC (the "Investor"), the Investor
July 1, 2022	S-3	As filed with the Securities and Exchange Commission on July 1, 2022 Table of Contents As filed with the Securities and Exchange Commission on July 1, 2022 ? Registration No.
July 1, 2022	EX-4.2	FORM OF CLEARSIGN TECHNOLOGIES CORPORATION INDENTURE DATED AS OF [ ] [Name of Trustee] As TRUSTEE Exhibit 4.2 FORM OF CLEARSIGN TECHNOLOGIES CORPORATION INDENTURE DATED AS OF [ ] [Name of Trustee] As TRUSTEE ? ? 1 TABLE OF CONTENTS Page ARTICLE I DEFINITIONS AND INCORPORATION BY REFERENCE ?1 Section 1.1 Definitions. ?1 Section 1.2 Other Definitions. ?5 Section 1.3 Incorporation by Reference of Trust Indenture Act. ?5 Section 1.4 Rules of Construction. ?6 ARTICLE II THE SECURITIES ?6 Section 2.
July 1, 2022	EX-FILING FEES	Filing Fee Table ? Exhibit 107 ? Calculation of Filing Fee Tables ? Form S-3 (Form Type) ? ClearSign Technologies Corporation (Exact Name of Registrant as Specified in its Charter) ? Table 1-Newly Registered and Carry Forward Securities ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered (1) Proposed Maximum Offering Price Per Unit (2) Proposed Maximum Aggregate Offering Price (3) Fee Rate Amount of Registration Fee Fees to Be Paid Equity Common Stock, par value $0.
June 7, 2022	EX-99.1	ClearSign Technologies Corporation Provides First Quarter 2022 Update Exhibit 99.1 ClearSign Technologies Corporation Provides First Quarter 2022 Update Tulsa, OK, June 2, 2022 - ClearSign Technologies Corporation (Nasdaq: CLIR) ("ClearSign" or the "Company"), an emerging leader in industrial combustion and sensing technologies that improve energy, operational efficiency and safety while dramatically reducing emissions, today provides an update on operations for the
June 7, 2022	8-K	Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Submission of Matters to a Vote of Security Holders 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): June 2, 2022 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in Charter) Washington 001-35521 26-2056298 (State or other jurisdiction of incorporation or organization) (Co
June 7, 2022	EX-99.2	ClearSign Technologies First Quarter 2022 Conference Call Thursday, June 6, 2022, 5:00 PM Eastern EX-99.2 3 tm2217668d1ex99-2.htm EXHIBIT 99.2 Exhibit 99.2 ClearSign Technologies First Quarter 2022 Conference Call Thursday, June 6, 2022, 5:00 PM Eastern Executives Matthew Selinger; Firm IR Group Jim Deller; President and CEO Brent Hinds; VP of Finance and Controller Analysts Jeff Feinglass; Private Investor Robert Kecseg; Las Colinas Capital Management Presentation Operator: Good day, and welc
June 1, 2022	8-K	Financial Statements and Exhibits, Other Events 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): June 1, 2022 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in Charter) Washington 001-35521 26-2056298 (State or other jurisdiction of incorporation or organization) (Co
June 1, 2022	EX-99.1	ClearSign Technologies Corporation Announces Closing of Public Offering Underwriter Exercises Its Overallotment Option in Full Exhibit 99.1 ClearSign Technologies Corporation Announces Closing of Public Offering Underwriter Exercises Its Overallotment Option in Full Tulsa, OK. June 1, 2022 ?ClearSign Technologies Corporation (Nasdaq: CLIR) (?ClearSign? or the ?Company?), an emerging leader in industrial combustion and sensing technologies that improve energy, operational efficiency and safety while dramatically reducing e
May 31, 2022	EX-1.1	Underwriting Agreement, dated as of May 27, 2022, between the Company and Newbridge Securities Corporation Exhibit 1.1 UNDERWRITING AGREEMENT between CLEARSIGN TECHNOLOGIES CORPORATION and NEWBRIDGE SECURITIES CORPORATION Common Stock May 27, 2022 Newbridge Securities Corporation 1200 North Federal Highway Boca Raton, Florida 33432 Ladies and Gentlemen: The undersigned, ClearSign Technologies Corporation, a corporation formed under the laws of the State of Washington (the ?Company?), hereby confirms it
May 31, 2022	EX-10.1	Purchase Right Waiver of clirSPV LLC (incorporated by reference to Exhibit 10.1 to the Company’s Form 8-K filed with the Securities and Exchange Commission on May 31, 2022). Exhibit 10.1 clirSPV LLC May 26, 2022 Board of Directors ClearSign Technologies Corporation Re: Waiver of Notice Requirement and Participation Right Ladies and Gentlemen: Pursuant to Section 2 of Appendix IV of that certain Stock Purchase Agreement (the ?Agreement?) entered into on July 12, 2018 between ClearSign Technologies Corporation (the ?Company?) and clirSPV LLC (the ?Investor?), the Invest
May 31, 2022	EX-99.2	ClearSign Technologies Corporation Prices Underwritten Public Offering of Common Stock Exhibit 99.2 ClearSign Technologies Corporation Prices Underwritten Public Offering of Common Stock Tulsa, OK. May 27, 2022 ?ClearSign Technologies Corporation (Nasdaq: CLIR) (?ClearSign? or the ?Company?), an emerging leader in industrial combustion and sensing technologies that improve energy, operational efficiency and safety while dramatically reducing emissions, today announced the pricing of
May 31, 2022	424B5	3,640,000 Shares of Common Stock 424B5 1 tm2217206d1424b5.htm 424B5 Filed pursuant to Rule 424(b)(5) Registration No. 333-232402 PROSPECTUS SUPPLEMENT (To the Prospectus Dated July 12, 2019) 3,640,000 Shares of Common Stock We are offering shares of our common stock. Our common stock is listed on the Nasdaq Capital Market under the symbol “CLIR.” On May 25, 2022, the last reported sale price of our common stock on the Nasdaq Capi
May 31, 2022	EX-99.1	ClearSign Technologies Corporation Announces Proposed Public Offering of Common Stock Exhibit 99.1 ClearSign Technologies Corporation Announces Proposed Public Offering of Common Stock Tulsa, OK. May 26, 2022 ?ClearSign Technologies Corporation (Nasdaq: CLIR) (?ClearSign? or the ?Company?), an emerging leader in industrial combustion and sensing technologies that improve energy, operational efficiency and safety while dramatically reducing emissions, today announced that it is prop
May 31, 2022	8-K	Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Other Events 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 26, 2022 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in Charter) Washington 001-35521 26-2056298 (State or other jurisdiction of incorporation or organization) (Co
May 26, 2022	424B5	SUBJECT TO COMPLETION, DATED MAY 26, 2022 Filed pursuant to Rule 424(b)(5) Registration No. 333-232402 The information in this preliminary prospectus supplement is not complete and may be changed. Neither this preliminary prospectus supplement nor the accompanying prospectus is an offer to sell these securities, and we are not soliciting an offer to buy these securities, in any jurisdiction where the offer or sale is not permitted. SUBJEC
May 16, 2022	10-Q	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2022 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 00
April 26, 2022	EX-FILING FEES	Filing Fee Table (filed herewith) EXHIBIT 107 Calculation of Filing Fee Table Form S-8 (Form Type) ClearSign Technologies Corporation (Exact Name of Registrant as Specified in its Charter) Newly Registered Securities Security Type Security Class Title Fee Calculation Rule Amount Registered(1) Proposed Maximum Offering Price Per Unit(3) Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Equity Common Stock, $0.
April 26, 2022	S-8	As filed with the U.S. Securities and Exchange Commission on April 26, 2022 As filed with the U.S. Securities and Exchange Commission on April 26, 2022 Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 ClearSign Technologies Corporation (Exact name of Registrant as specified in its charter) Washington 26-2056298 (State or other jurisdiction of incorporation or orga
April 22, 2022	DEF 14A	SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 DEF 14A 1 tmb-20220606xdef14a.htm DEF 14A Table of Contents SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ⌧ Filed by a Party other than the Registrant ¨ Check the appropriate box: ¨ Preliminary Proxy Statement ¨ Confidential, For Use of the Commiss
April 22, 2022	DEFA14A	SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 DEFA14A 1 tmb-20220422xdefa14a.htm DEFA14A SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ⌧ Filed by a Party other than the Registrant ◻ Check the appropriate box: ◻ Preliminary Proxy Statement ◻ Confidential, For Use of the Commission Only (as perm
April 14, 2022	424B5	Up to $8,800,000 Common Stock Filed pursuant to Rule 424(b)(5) Registration No. 333-232402 PROSPECTUS SUPPLEMENT (To the Prospectus Supplement Dated December 23, 2020 To the Prospectus Dated July 12, 2019) Up to $8,800,000 Common Stock This prospectus supplement amends and supplements the information in the prospectus, dated July 19, 2019 (the ?Prospectus?), filed with the Securities and Exchange Commission as a part of our re
April 8, 2022	EX-99.2	[ CLIR ] - ClearSign Technologies Q4 and Full Year 2021 Conference Call Wednesday, April 6, 2022 5:00 PM EST. Exhibit 99.2 [ CLIR ] - ClearSign Technologies Q4 and Full Year 2021 Conference Call Wednesday, April 6, 2022 5:00 PM EST. Officers Matthew Selinger, Firm IR Group Jim Deller, President and Chief Executive Officer Brent Hinds, VP of Finance and Controller Analysts Amit Dayal, H.C. Wainwright Peter Jacobs, Stifel Jeff Feinglass, Private Investor Robert Kecseg, Las Colinas Capital Management Robert
April 8, 2022	EX-99.1	ClearSign Technologies Corporation Provides Full Year 2021 Update Exhibit 99.1 ClearSign Technologies Corporation Provides Full Year 2021 Update Tulsa, OK, April 6, 2022 - ClearSign Technologies Corporation (Nasdaq: CLIR) ("ClearSign" or the "Company"), an emerging leader in industrial combustion and sensing technologies that improve energy, operational efficiency and safety while dramatically reducing emissions, today provides an update on operations for the fo
April 8, 2022	8-K	Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition 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): April 6, 2022 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in Charter) Washington 001-35521 26-2056298 (State or other jurisdiction of incorporation or organization) (C
March 31, 2022	EX-10.19	First Amendment to Lease, entered into as of July 29, 2019, between Tulsa Portfolio Oklahoma Realty LP and ClearSign Technologies Corporation (incorporated by reference to Exhibit 10.19 to the Company’s Form 10-K filed with the Securities and Exchange Commission on March 31, 2022). FIRST AMENDMENT TO LEASE ? ? THIS FIRST AMENDMENT TO LEASE (?First Amendment?) is entered into effective this day of July 29, 2019 (?Effective Date?), by and between TULSA PORTFOLIO OKLAHOMA REALTY LP, a Delaware limited partnership (?Landlord?), and CLEARSIGN COMBUSTION CORPORATION, a Washington corporation (?Tenant?).
March 31, 2022	EX-10.18	Lease Agreement, entered into as of June 20, 2016, between Paradigm Realty Advisors, L.L.C. and ClearSign Technologies Corporation (incorporated by reference to Exhibit 10.18 to the Company’s Form 10-K filed with the Securities and Exchange Commission on March 31, 2022). ? ? ? ? ? LEASE AGREEMENT THIS LEASE AGREEMENT (this "Lease") is entered into as of June 20, 2016, between Paradigm Realty Advisors, L.
March 31, 2022	EX-10.13	2021 Equity Incentive Plan Form of Stock Option Award Agreement (incorporated by reference to Exhibit 10.13 to the Company’s Form 10-K filed with the Securities and Exchange Commission on March 31, 2022). CLEARSIGN TECHNOLOGIES CORPORATION 2021 EQUITY INCENTIVE PLAN STOCK OPTION AGREEMENT NOTICE OF STOCK OPTION GRANT Unless otherwise defined herein, the terms defined in the ClearSign Technologies Corporation 2021 Equity Incentive Plan (the ?Plan?) will have the same defined meanings in this Stock Option Agreement which includes the Notice of Stock Option Grant (the ?Notice of Grant?), the Terms and Conditions of Stock Option Grant, attached hereto as Exhibit A, the Exercise Notice, attached hereto as Exhibit B, and all other exhibits, appendices, and addenda attached hereto (together, the ?Option Agreement?).
March 31, 2022	EX-10.14	2021 Equity Incentive Plan Form of Restricted Stock Unit Award Agreement (incorporated by reference to Exhibit 10.14 to the Company’s Form 10-K filed with the Securities and Exchange Commission on March 31, 2022). CLEARSIGN TECHNOLOGIES CORPORATION 2021 EQUITY INCENTIVE PLAN RESTRICTED STOCK UNIT AGREEMENT NOTICE OF RESTRICTED STOCK UNIT GRANT Unless otherwise defined herein, the terms defined in the ClearSign Technologies Corporation 2021 Equity Incentive Plan (the ?Plan?) will have the same defined meanings in this Restricted Stock Unit Agreement which includes the Notice of Restricted Stock Unit Grant (the ?Notice of Grant?), the Terms and Conditions of Restricted Stock Unit Grant, attached hereto as Exhibit A, and all other exhibits, appendices, and addenda attached hereto (the ?Award Agreement?).
March 31, 2022	EX-10.15	2021 Equity Incentive Plan Form of Restricted Stock Award Agreement (incorporated by reference to Exhibit 10.15 to the Company’s Form 10-K filed with the Securities and Exchange Commission on March 31, 2022). CLEARSIGN TECHNOLOGIES CORPORATION 2021 EQUITY INCENTIVE PLAN NOTICE OF RESTRICTED STOCK AWARD ? Participant?s Name and Address: ? In accordance with the approval of the Compensation Committee of the Board of Directors of ClearSign Technologies Corporation (the ?Company?) on November 18, 2021, you (the ?Participant?) have been granted a stock bonus in the form of a restricted stock award (the ?Award?) consisting of shares of Common Stock of the Company as set forth below.
March 31, 2022	10-K	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.
March 31, 2022	EX-10.20	Second Amendment to Lease, entered into as of January 14, 2020, between Tulsa Portfolio Oklahoma Realty LP and ClearSign Technologies Corporation (incorporated by reference to Exhibit 10.20 to the Company’s Form 10-K filed with the Securities and Exchange Commission on March 31, 2022). SECOND AMENDMENT TO LEASE ? ? THIS SECOND AMENDMENT TO LEASE (?Second Amendment?) is entered into effective this ? 14 day of January? ? 20 20? ? (?Effective Date?), by and between TULSA ? PORTFOLIO OKLAHOMA REALTY LP, a Delaware limited partnership (?Landlord?), and CLEARSIGN COMBUSTION CORPORATION, a Washington corporation (?Tenant?).
December 23, 2021	CORRESP	Mitchell Silberberg & Knupp llp Mitchell Silberberg & Knupp llp A Law Partnership Including Professional Corporations Blake J.
December 23, 2021	10-Q/A	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q/A Amendment No. 1 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q/A Amendment No. 1 (Mark One) x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 001
December 23, 2021	10-Q/A	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q/A Amendment No. 1 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q/A Amendment No. 1 (Mark One) x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2021 OR ¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Numbe
November 29, 2021	EX-99.1	ClearSign Technologies Corporation Provides Third Quarter 2021 Update Exhibit 99.1 ClearSign Technologies Corporation Provides Third Quarter 2021 Update SEATTLE, November 23, 2021 - ClearSign Technologies Corporation (Nasdaq: CLIR) ("ClearSign" or the "Company"), an emerging leader in industrial combustion and sensing technologies that improve energy, operational efficiency and safety while dramatically reducing emissions, today provides an update on operations for
November 29, 2021	EX-99.2	Officers and Speakers Exhibit 99.2 Event Name: [ CLIR ] - ClearSign Technologies Third Quarter 2021 Conference Call Event Date: Tuesday, November 23, 2021 5:00 PM Eastern Time Officers and Speakers Matthew Selinger; Firm IR Group Jim Deller; President and Chief Executive Officer Brent Hinds; VP of Finance Analysts Amit Dayal; H.C. Wainwright Jeff Feinglass; Private Investor Perry Monty; Private Investor Presentation Op
November 29, 2021	8-K	Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition 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): November 23, 2021 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in Charter) Washington 001-35521 26-2056298 (State or other jurisdiction of incorporation or organization
November 12, 2021	10-Q	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.
November 12, 2021	EX-10.1	Offer Letter dated October 18, 2021 by and between the Company and Brent Hinds (incorporated by reference to Exhibit 10.1 to the Company’s Form 10-Q filed with the Securities and Exchange Commission on November 12, 2021). Exhibit 10.1 ? ? September 30th, 2021 ? Brent Hinds C/O Robert Half Executuve Search ? Re: Offer of Employment: Vice President and Controller ? Dear Brent: ? ClearSign Technologies Corporation is pleased to offer you a position as Vice President and Controller, reporting directly to our Chief Executive Officer, commencing Monday, October 18, 2021. In this position, you may be deemed to be an offic
October 18, 2021	EX-99.1	ClearSign Technologies Corporation Announces Hiring of Brent Hinds as VP of Finance Exhibit 99.1 ClearSign Technologies Corporation Announces Hiring of Brent Hinds as VP of Finance SEATTLE, October 18, 2021 - ClearSign Technologies Corporation (Nasdaq: CLIR) ("ClearSign" or the "Company"), an emerging leader in industrial combustion and sensing technologies that improve energy, operational efficiency and safety while dramatically reducing emissions, today announces the hiring of
October 18, 2021	8-K	Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits 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): October 18, 2021 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in Charter) Washington 001-35521 26-2056298 (State or other jurisdiction of incorporation or organization)
September 10, 2021	8-K	Regulation FD Disclosure, Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits, Results of Operations and Financial Condition 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): September 8, 2021 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in Charter) Washington 001-35521 26-2056298 (State or other jurisdiction of incorporation or organization
September 10, 2021	EX-3.2	Redline of Bylaws, as amended, effective September 8, 2021 Exhibit 3.2 BYLAWS OF CLEARSIGN COMBUSTION TECHNOLOGIES CORPORATION SECTION 1. DEFINITIONS As used in these Bylaws, the following terms shall have the following meanings: "Articles of Incorporation" means the corporation's Articles of Incorporation and all amendments as filed with the Washington Secretary of State. "Board" means the Board of Directors of the corporation. "Electronic transmission"
September 10, 2021	EX-99.1	ClearSign Technologies Corporation Provides Second Quarter 2021 Update Exhibit 99.1 ClearSign Technologies Corporation Provides Second Quarter 2021 Update SEATTLE, September 8, 2021 - ClearSign Technologies Corporation (Nasdaq: CLIR) ("ClearSign" or the "Company"), an emerging leader in industrial combustion and sensing technologies that improve energy, operational efficiency and safety while dramatically reducing emissions, today provides an update on operations for
September 10, 2021	EX-3.1	Bylaws, as amended, effective September 8, 2021 EX-3.1 2 tm2127344d2ex3-1.htm EXHIBIT 3.1 Exhibit 3.1 BYLAWS OF CLEARSIGN TECHNOLOGIES CORPORATION (Amended as of September 8, 2021) SECTION 1. DEFINITIONS As used in these Bylaws, the following terms shall have the following meanings: "Articles of Incorporation" means the corporation's Articles of Incorporation and all amendments as filed with the Washington Secretary of State. "Board" means the
September 10, 2021	EX-99.2	ClearSign Technologies Corporation [CLIR] Second Quarter 2021 Conference Call Wednesday, September 8, 2021, 5:00 PM ET. EX-99.2 5 tm2127344d2ex99-2.htm EXHIBIT 99.2 Exhibit 99.2 ClearSign Technologies Corporation [CLIR] Second Quarter 2021 Conference Call Wednesday, September 8, 2021, 5:00 PM ET. Company Participants: Matthew Selinger, Firm IR Group Jim Deller, President and Chief Executive Officer Analysts and Private Investors: Amit Dayal, H.C. Wainwright Robert Kecseg, Las Colinas Capital Management Jeff Feingla
August 20, 2021	10-Q	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.
August 20, 2021	EX-10.1	Letter Agreement dated April 20, 2021 by and between the Company and Brian G. Fike Exhibit 10.1 ? ClearSign Technologies Corp. Dear Brian, This letter confirms our discussion regarding your planned resignation from ClearSign Technologies Corporation that is set to occur on December 3, 2021. We value your commitment to ClearSign Technologies, and we hope that you will stay with us to continue your work and help effectuate a smooth transition of your responsibilities. To encourage
August 16, 2021	NT 10-Q	UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 12b-25 NOTIFICATION OF LATE FILING SEC FILE NUMBER CUSIP NUMBER (Check One): ¨ Form 10-K ¨ Form 20-F ¨ Form 11-K x Form 10-Q ¨ Form 10-D ¨ Form N-SAR ¨ Form N-CSR For Period E UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 12b-25 NOTIFICATION OF LATE FILING 001-35521 SEC FILE NUMBER 185064102 CUSIP NUMBER (Check One): ? Form 10-K ? Form 20-F ? Form 11-K x Form 10-Q ? Form 10-D ? Form N-SAR ? Form N-CSR For Period Ended: June 30, 2021 ? Transit ion Report on Form 10-K ? Transit ion Report on Form 20-F ? Transit ion Report on Form 11-K ? Transition Report on Form 10-Q ? Transition Report on Form N-SAR For the Transition Period Ended: Nothing in this form shall be construed to imply that the Commission has verified any information contained herein.
July 30, 2021	EX-99.1	ClearSign Technologies Corporation Announces Passing of Chief Financial Officer Brian Fike Exhibit 99.1 ClearSign Technologies Corporation Announces Passing of Chief Financial Officer Brian Fike SEATTLE, July 30, 2021 - ClearSign Technologies Corporation (Nasdaq: CLIR) ("ClearSign" or the "Company"), an emerging leader in industrial combustion and sensing technologies that improve energy, operational efficiency and safety while dramatically reducing emissions, today announces with great
July 30, 2021	8-K	Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits 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): July 29, 2021 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in Charter) Washington 001-35521 26-2056298 (State or other jurisdiction of incorporation or organization) (C
July 7, 2021	EX-16.1	Letter of Gumbiner Savett Inc., dated July 7, 2021. Exhibit 16.1 July 7, 2021 U.S. Securities and Exchange Commission 100 F Street, NE Washington, DC 20549 Ladies and Gentleman: We are the former independent registered public accounting firm for ClearSign Technologies Corporation and Subsidiary (the ?Company?). We have read the Company?s disclosure set forth in Item 4.01 ?Changes in Registrant?s Certifying Accountant? of the Company?s Current Repor
July 7, 2021	8-K	Financial Statements and Exhibits, Changes in Registrant's Certifying Accountant 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): July 1, 2021 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in Charter) Washington 001-35521 26-2056298 (State or other jurisdiction of incorporation or organization) (Co
July 2, 2021	S-8 POS	As filed with the U.S. Securities and Exchange Commission on July 2, 2021 As filed with the U.S. Securities and Exchange Commission on July 2, 2021 Registration No. 333-184884 Registration No. 333-204129 Registration No. 333-228267 Registration No. 333-238613 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Post-Effective Amendment No. 1 to Form S-8 Registration Statement No. 333-184884 Post-Effective Amendment No. 1 to Form S-8 Registration State
July 2, 2021	S-8 POS	As filed with the U.S. Securities and Exchange Commission on July 2, 2021 As filed with the U.S. Securities and Exchange Commission on July 2, 2021 Registration No. 333-184884 Registration No. 333-204129 Registration No. 333-228267 Registration No. 333-238613 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Post-Effective Amendment No. 1 to Form S-8 Registration Statement No. 333-184884 Post-Effective Amendment No. 1 to Form S-8 Registration State
July 2, 2021	S-8 POS	As filed with the U.S. Securities and Exchange Commission on July 2, 2021 As filed with the U.S. Securities and Exchange Commission on July 2, 2021 Registration No. 333-184884 Registration No. 333-204129 Registration No. 333-228267 Registration No. 333-238613 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Post-Effective Amendment No. 1 to Form S-8 Registration Statement No. 333-184884 Post-Effective Amendment No. 1 to Form S-8 Registration State
July 2, 2021	S-8	As filed with the U.S. Securities and Exchange Commission on July 2, 2021 As filed with the U.S. Securities and Exchange Commission on July 2, 2021 Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 ClearSign Technologies Corporation (Exact name of Registrant as specified in its charter) Washington 26-2056298 (State or other jurisdiction of incorporation or organi
July 2, 2021	S-8 POS	As filed with the U.S. Securities and Exchange Commission on July 2, 2021 As filed with the U.S. Securities and Exchange Commission on July 2, 2021 Registration No. 333-184884 Registration No. 333-204129 Registration No. 333-228267 Registration No. 333-238613 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Post-Effective Amendment No. 1 to Form S-8 Registration Statement No. 333-184884 Post-Effective Amendment No. 1 to Form S-8 Registration State
June 21, 2021	EX-99.2	Event Name: ClearSign Technologies First Quarter 2021 Conference Call Exhibit 99.2 Event Name: ClearSign Technologies First Quarter 2021 Conference Call Event Date: Tuesday, June 15, 2021 5:00 PM ET Officers and Speakers Matthew Selinger; Investor Relations Brian Fike; Chief Financial Officer Jim Deller; Chief Executive Officer Analysts Amit Dayal; H.C. Wainwright David Brown; Private Investor Robert Kecseg; Las Colinas Capital Management Robert Harvey; Private Inve
June 21, 2021	8-K	Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Submission of Matters to a Vote of Security Holders 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): June 15, 2021 CLEARSIGN TECHNOLOGIES CORPORATION (Exact name of registrant as specified in Charter) Washington 001-35521 26-2056298 (State or other jurisdiction of incorporation or organization) (C
June 21, 2021	EX-99.1	ClearSign Technologies Corporation Provides First Quarter 2021 Update Exhibit 99.1 ClearSign Technologies Corporation Provides First Quarter 2021 Update SEATTLE, June 15, 2021 - ClearSign Technologies Corporation (Nasdaq: CLIR) ("ClearSign" or the "Company"), an emerging leader in industrial combustion and sensing technologies that improve energy, operational efficiency and safety while dramatically reducing emissions, today provides an update on operations for the

CLIR / ClearSign Technologies Corporation - Pengajuan SECLaporan Tahunan, Pernyataan Proksi

Mga Batayang Estadistika

SEC Filings

SEC Filings (Chronological Order)

Other Listings

GB:0I0B
DE:4CC	€ 0.49