OTHER INFORMATION
−Removed: None of the Company’s directors or officers adopted , modified or terminated a Rule 10b-5 trading arrangement or a non-Rule 10b-5 trading arrangement during the fiscal quarter ended March 31, 2026, as such terms are defined under Item 408(a) of Regulation S-K.
+Added: None of the Company’s directors or officers adopted , modified or terminated a Rule 10b-5 trading arrangement or a non-Rule 10b-5 trading arrangement during the fiscal quarter ended June 30, 2026, as such terms are defined under Item 408(a) of Regulation S-K.
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).
7 unchanged sentences
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).
+Added: Underwriting Agreement, dated as of May 28, 2026, by and between the Company and Newbridge Securities Corporation (incorporated by reference to Exhibit 1.1 of the Company’s Form 8-K filed with the Securities and Exchange Commission on June 1, 2026)
+Added: Amended and Restated ClearSign Technologies Corporation 2021 Equity Incentive Plan (incorporated by reference to Annex A of the Company’s definitive proxy statement on Schedule 14A filed with the Securities and Exchange Commission on April 28, 2026).
Rule 13a-14(a)/15d-14(a) Certification of Principal Executive Officer .
10 unchanged sentences
**Furnished herewith.
+Added: + Management contracts and compensatory plans and arrangements.
Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.
CLEARSIGN TECHNOLOGIES CORPORATION
+Added: August 14, 2026
/s/ Colin James Deller
2 unchanged sentences
(Principal Executive Officer)
+Added: August 14, 2026
/s/ Brent Hinds
2 unchanged sentences
Compared sentence by sentence after normalising whitespace, quotation marks, case and digits, so re-formatting and restated figures do not read as changed language. Wording changes appear as one removal and one addition. The current filing and the prior one are authoritative.