<SEC-DOCUMENT>0001790300-25-000003.txt : 20250409
<SEC-HEADER>0001790300-25-000003.hdr.sgml : 20250409
<ACCEPTANCE-DATETIME>20250409163008
ACCESSION NUMBER:		0001790300-25-000003
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20250214
FILED AS OF DATE:		20250409
DATE AS OF CHANGE:		20250409

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			PASQUESI JOHN M
		CENTRAL INDEX KEY:			0001227099
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-35521
		FILM NUMBER:		25825553

	MAIL ADDRESS:	
		STREET 1:		C/O OTTER CAPITAL
		STREET 2:		ONE MARITIME PLAZA SUITE 1400
		CITY:			SAN FRANCISCO
		STATE:			CA
		ZIP:			94111

ISSUER:		

	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

	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
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2025-02-14</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001434524</issuerCik>
        <issuerName>ClearSign Technologies Corp</issuerName>
        <issuerTradingSymbol>CLIR</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001227099</rptOwnerCik>
            <rptOwnerName>PASQUESI JOHN M</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O OTTER CAPITAL LLC</rptOwnerStreet1>
            <rptOwnerStreet2>PO BOX 620067</rptOwnerStreet2>
            <rptOwnerCity>WOODSIDE</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94062</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>8434774</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Otter Capital LLC</value>
                    <footnoteId id="F1"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Warrant to Purchase Common Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>1.05</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2025-02-14</value>
            </exerciseDate>
            <expirationDate>
                <value>2029-06-24</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                    <footnoteId id="F2"/>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>6633315</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Otter Capital LLC</value>
                    <footnoteId id="F1"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The reporting person is the managing member of Otter Capital LLC.</footnote>
        <footnote id="F2">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 &quot;Beneficial Ownership Limitation&quot;). 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.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>John Pasquesi</signatureName>
        <signatureDate>2025-04-08</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
