# EDGAR Filing Document

**Accession Number:** 0001434524
**File Stem:** 0001104659-25-075708
**Filing Date:** 2025-8
**Character Count:** 11465
**Document Hash:** 44f4c9255f23a3ba6e4b5a5ed394963b
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-25-075708.hdr.sgml**: 20250808

**ACCESSION NUMBER**: 0001104659-25-075708

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 14

**CONFORMED PERIOD OF REPORT**: 20250804

**ITEM INFORMATION**: Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing

**ITEM INFORMATION**: Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

**ITEM INFORMATION**: Other Events

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20250808

**DATE AS OF CHANGE**: 20250808

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** ClearSign Technologies Corp
- **CENTRAL INDEX KEY:** 0001434524
- **STANDARD INDUSTRIAL CLASSIFICATION:** INDUSTRIAL INSTRUMENTS FOR MEASUREMENT, DISPLAY, AND CONTROL [3823]
- **ORGANIZATION NAME:** 08 Industrial Applications and Services
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-35521
- **FILM NUMBER:** 251198725

**BUSINESS ADDRESS:**
- **STREET 1:** 8023 E. 63RD PLACE, SUITE 101
- **CITY:** TULSA
- **STATE:** OK
- **ZIP:** 74133
- **BUSINESS PHONE:** (918) 236-6461

**MAIL ADDRESS:**
- **STREET 1:** 8023 E. 63RD PLACE, SUITE 101
- **CITY:** TULSA
- **STATE:** OK
- **ZIP:** 74133

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** CLEARSIGN COMBUSTION CORP
- **DATE OF NAME CHANGE:** 20080507

?xml version='1.0' encoding='ASCII'?

**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)**

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| | | |
|:---|:---|:---|
| **Delaware** | **001-35521** | **26-2056298** |
| **(State or other jurisdiction of <br> incorporation)** | **(Commission File Number)** | **(IRS Employer <br> Identification No.)** |

---

**8023 E. 63rd Place, Suite 101**

**Tulsa** **, Oklahoma 74133**

**(Address of Principal Executive Offices) (Zip Code)**

**(918) 236-6461**

**(Registrant's telephone number, including area code)**

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

◻ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

◻ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR240.14a-12)

◻ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)).

◻ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13(e)-4(c))

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

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| | | |
|:---|:---|:---|
| **Title of each class** | **Trading Symbol(s)** | **Name of each exchange on which <br> registered** |
| **Common Stock** | **CLIR** | **The Nasdaq Stock Market LLC** |

---

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

Emerging growth company ◻

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

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| | |
|:---|:---|
| **Item 3.01** | **Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing.** |

---

On August 8, 2025, ClearSign Technologies Corporation (the "Company") received a notice (the "Notice") from the Listing Qualifications Department of the Nasdaq Stock Market LLC ("Nasdaq") stating that the Company is not in compliance with the board of directors independence requirement set forth in Nasdaq Listing Rule 5605(b)(1) and the audit committee composition requirement set forth in Nasdaq Listing Rule 5605(c)(2)(A) (collectively, the "Nasdaq Composition Requirements") due to the resignations of Catharine M. de Lacy and Judith S. Schrecker (as described below) from the Company's board of directors (the "Board").

Specifically, when the Notice was issued, the Board did not have a majority of directors that would be considered "independent directors," as that term is defined in Nasdaq Listing Rule 5605(a)(2), and the Audit and Risk Committee of the Board (the "Audit Committee") consisted of only two independent directors, rather than the minimum three independent directors as required by Nasdaq Listing Rule 5605(c)(2)(A).

The Company intends to regain compliance with the Nasdaq Composition Requirements by appointing a new director to the Board and Audit Committee who meets the independence requirements under Nasdaq rules and Rule 10A-3(b)(1) under the Securities Exchange Act of 1934, as amended (the "Exchange Act"). Consistent with Nasdaq Listing Rules 5605(b)(1)(A) and 5605(c)(4), Nasdaq has provided the Company a cure period in order to regain compliance with the Nasdaq Composition Requirements (i) until the earlier of the Company's next annual meeting of stockholders or one year from the resignation of Mss. de Lacy and Schrecker, or August 4, 2026, or (ii) if the Company's next annual meeting of stockholders is held before February 2, 2026, then no later than February 2, 2026.

The Notice has no immediate effect on the listing of the Company's common stock on Nasdaq.

**Item 5.02. &nbsp;&nbsp;&nbsp;&nbsp;Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.**

On August 4, 2025, Ms. de Lacy and Ms. Schrecker each notified the Company that they resigned from the Board, effective immediately. At the time of Ms. de Lacy's resignation, she was a member of the Board, chairperson of the Nominating and Corporate Governance Committee of the Board (the "Governance Committee") and a member of the Human Capital and Compensation Committee of the Board (the "Compensation Committee"). At the time of Ms. Schrecker's resignation, she was a member of the Board, the lead independent director of the Board, chairperson of the Audit Committee, and a member of the Governance Committee and Compensation Committee. The decision by Mss. de Lacy and Schrecker to resign was not the result of any disagreement with the Company, known to an executive officer of the Company, on any matter relating to the Company's operations, policies or practices.

In connection with the resignation of Mss. de Lacy and Schrecker, the Board decreased the number of directors from six to five on August 6, 2025, effective immediately. Further, on the same date, the Board appointed Louis J. Basenese, an independent director, to the Governance Committee and G. Todd Silva, an independent director, to the Compensation Committee, effective immediately. The Company does not currently intend to appoint a new lead independent director.

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| | |
|:---|:---|
| **Item 8.01** | **Other Events.** |

---

On August 8, 2025, the Company issued a press release announcing the actions described above in Item 5.02 of this Current Report on Form 8-K. A copy of the press release is being furnished as Exhibit 99.1 to this Current Report on Form 8-K.

The information in this Item 8.01, including Exhibit 99.1, is being furnished pursuant to Item 8.01 of Form 8-K and shall not be deemed "filed" for purposes of Section 18 of the Exchange Act, or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference into any of the Company's filings under the Securities Act of 1933, as amended, or the Exchange Act, whether made before or after the date hereof and regardless of any general incorporation language in such filings, except to the extent expressly set forth by specific reference in such a filing.

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| | |
|:---|:---|
| **Item 9.01** | **Financial Statements and Exhibits.** |

---

**(d) Exhibits.**

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| | |
|:---|:---|
| **Exhibit No.** | **Description** |
| [99.1\*](tm2522983d1_ex99-1.htm) | [Press Release, dated August 8, 2025.](tm2522983d1_ex99-1.htm) |
| 104 | Cover Page Interactive Data File (embedded within the Inline XBRL document). |

---

\* Furnished herewith.

**SIGNATURE**

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

Dated: August 8, 2025

---

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

---

## Exhibit 99.1

**Exhibit 99.1**

![](tm2522983d1_ex99-1img01.jpg)

**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 the use of cleaner fuels including hydrogen, today announced that Judith S. Schrecker and Catharine M. de Lacy have voluntarily resigned from the Company's Board of Directors (the "Board") on August 4, 2025, effective immediately. Following their resignations, the Board size was decreased from six directors to five directors.

"We are grateful to Judy and Catharine for their valuable contributions and thoughtful service during an important chapter of ClearSign's development," said Jim Deller, Ph.D., Chief Executive Officer of ClearSign. "We intend to fill this vacancy on the Board in the coming months and, as we enter an exciting new phase of commercialization and growth, we will take this opportunity to realign our Board to ensure that we provide the support needed for ClearSign's ongoing commercialization and growth objectives."

**About ClearSign Technologies Corporation**

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

**For further information:**

**Investor Relations:**

Matthew Selinger

Firm IR Group for ClearSign

+1 415-572-8152

<u>mselinger@firmirgroup.com</u>