Sec Form 3 Filing - PASQUESI JOHN M @ ClearSign Technologies Corp - 2025-02-14

FORM 3 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL OMB Number: 3235-0287 Expires: November 30, 2011 Estimated average burden hours per response... 0.5

1. Name and Address of Reporting Person PASQUESI JOHN M 2. Issuer Name and Ticker or Trading Symbol ClearSign Technologies Corp [ CLIR] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O OTTER CAPITAL LLC, PO BOX 620067 3. Date of Earliest Transaction (MM/DD/YY) 02/14/2025 (Street) WOODSIDE, CA94062 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 8,434,774 I By Otter Capital LLC ( 1 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Warrant to Purchase Common Stock $ 1.05 02/14/2025 06/24/2029 Common Stock ( 2 ) 6,633,315 I By Otter Capital LLC ( 1 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other PASQUESI JOHN M C/O OTTER CAPITAL LLC PO BOX 620067 WOODSIDE, CA94062 X Signatures John Pasquesi 04/08/2025 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The reporting person is the managing member of Otter Capital LLC. ( 2 )Each warrant entitles the holder to purchase one share of the issuer's common stock at an exercise price of $1.05 from the date of issuance through February 14, 2030. The issuer may redeem the warrants upon 30 days' advance notice if the closing price of the issuer's common stock equals or exceeds $2.275 for any 20 business days within a 30 consecutive business-day period, provided that such warrants may only be redeemed if there is an effective registration statement covering the resale of the warrant shares. The warrants are not exercisable to the extent that the exercise thereof would cause Otter Capital LLC and its affiliates to beneficially own greater than 19.99% of the outstanding shares of common stock of the issuer immediately after giving effect to the exercise (the "Beneficial Ownership Limitation"). As a result of the Beneficial Ownership Limitation, warrants to purchase up to 2,555,000 shares of the issuer's common stock are exercisable as of February 14, 2025.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.