<SEC-DOCUMENT>0001104659-24-075270.txt : 20240626
<SEC-HEADER>0001104659-24-075270.hdr.sgml : 20240626
<ACCEPTANCE-DATETIME>20240626200400
ACCESSION NUMBER:		0001104659-24-075270
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20240624
FILED AS OF DATE:		20240626
DATE AS OF CHANGE:		20240626

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			HOFFMAN Robert Thurston Sr
		CENTRAL INDEX KEY:			0001748409
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-35521
		FILM NUMBER:		241074984

	MAIL ADDRESS:	
		STREET 1:		119 WARREN AVENUE
		CITY:			SPRING LAKE
		STATE:			NJ
		ZIP:			07762

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			clirSPV LLC
		CENTRAL INDEX KEY:			0001747304
		ORGANIZATION NAME:           	
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-35521
		FILM NUMBER:		241074983

	BUSINESS ADDRESS:	
		STREET 1:		119 WARREN AVE
		STREET 2:		3RD FLOOR
		CITY:			SPRING LAKE
		STATE:			NJ
		ZIP:			07762-1217
		BUSINESS PHONE:		7322820743

	MAIL ADDRESS:	
		STREET 1:		119 WARREN AVE
		STREET 2:		3RD FLOOR
		CITY:			SPRING LAKE
		STATE:			NJ
		ZIP:			07762-1217

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			GPclirSPV LLC
		CENTRAL INDEX KEY:			0001749087
		ORGANIZATION NAME:           	
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-35521
		FILM NUMBER:		241074982

	BUSINESS ADDRESS:	
		STREET 1:		119 WARREN AVE
		STREET 2:		3RD FLOOR
		CITY:			SPRING LAKE
		STATE:			NJ
		ZIP:			07762
		BUSINESS PHONE:		6097311597

	MAIL ADDRESS:	
		STREET 1:		119 WARREN AVE
		STREET 2:		3RD FLOOR
		CITY:			SPRING LAKE
		STATE:			NJ
		ZIP:			07762

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Princeton Opportunity Management LLC
		CENTRAL INDEX KEY:			0001749086
		ORGANIZATION NAME:           	
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-35521
		FILM NUMBER:		241074981

	BUSINESS ADDRESS:	
		STREET 1:		119 WARREN AVE
		STREET 2:		3RD FLOOR
		CITY:			SPRING LAKE
		STATE:			NJ
		ZIP:			07762
		BUSINESS PHONE:		6097311597

	MAIL ADDRESS:	
		STREET 1:		119 WARREN AVE
		STREET 2:		3RD FLOOR
		CITY:			SPRING LAKE
		STATE:			NJ
		ZIP:			07762

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
		IRS NUMBER:				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>
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    <periodOfReport>2024-06-24</periodOfReport>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001748409</rptOwnerCik>
            <rptOwnerName>HOFFMAN Robert Thurston Sr</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>8023 E. 63RD PLACE, SUITE 101</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>TULSA</rptOwnerCity>
            <rptOwnerState>OK</rptOwnerState>
            <rptOwnerZipCode>74133</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
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            <otherText></otherText>
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    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001747304</rptOwnerCik>
            <rptOwnerName>clirSPV LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>119 WARREN AVENUE, 3RD FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SPRING LAKE</rptOwnerCity>
            <rptOwnerState>NJ</rptOwnerState>
            <rptOwnerZipCode>07762</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
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            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001749087</rptOwnerCik>
            <rptOwnerName>GPclirSPV LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>119 WARREN AVENUE, 3RD FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SPRING LAKE</rptOwnerCity>
            <rptOwnerState>NJ</rptOwnerState>
            <rptOwnerZipCode>07762</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
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            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001749086</rptOwnerCik>
            <rptOwnerName>Princeton Opportunity Management LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>119 WARREN AVENUE, 3RD FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SPRING LAKE</rptOwnerCity>
            <rptOwnerState>NJ</rptOwnerState>
            <rptOwnerZipCode>07762</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2024-06-24</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>3350000</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.91</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>9539857</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>110519</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>IRA</value>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>237464</value>
                    <footnoteId id="F4"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Redeemable Warrants to Purchase Common Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F5"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2024-06-24</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>7039500</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.01</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F5"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F5"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>7039500</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>7039500</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Pre-Funded Warrants to Purchase Common Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F6"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2024-06-24</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>1343000</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.9099</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F6"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F6"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>1343000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1343000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The securities reported herein were issued to clirSPV LLC (&quot;clirSPV&quot;) pursuant to a Securities Purchase Agreement, dated as of June 24, 2024, as amended on June 26, 2024 (as amended, the &quot;Purchase Agreement&quot;), by and among the Issuer and clirSPV, in connection with its participation right to purchase unregistered securities of the Issuer to maintain a 19.99% ownership percentage of the Issuer's outstanding shares of common stock on terms and conditions no different than those offered to other purchasers. Pursuant to the Purchase Agreement, the Issuer issued clirSPV an aggregate of (i) 3,350,000 shares of common stock, (ii) redeemable warrants to purchase up to 7,039,500 shares of common stock and (iii) pre-funded warrants to purchase up to 1,343,000 shares of common stock.</footnote>
        <footnote id="F2">Mr. Hoffman is the managing member of GPclirSPV LLC which is the managing member of clirSPV, the owner of the shares of common stock. Mr. Hoffman disclaims beneficial ownership of these shares except to the extent of his pecuniary interest in clirSPV. Mr. Hoffman has direct ownership of none of the shares of common stock purchased and a total direct beneficial ownership of 237,464 shares of common stock. clirSPV has direct ownership of 3,350,000 shares of common stock purchased and total direct beneficial ownership of 9,539,857 shares of common stock. GPclirSPV LLC has no direct ownership of the shares purchased and total indirect beneficial ownership of 9,539,857 shares of common stock. Princeton Opportunity Management LLC has no direct ownership of shares purchased and total indirect beneficial ownership of 9,539,857 shares of common stock.</footnote>
        <footnote id="F3">Includes 110,519 shares of common stock held in an individual retirement arrangement (&quot;IRA&quot;).</footnote>
        <footnote id="F4">This total reflects the effect of other transactions that have occurred since the date of Mr. Hoffman's last Form 4, including vesting of restricted stock units previously issued to Mr. Hoffman as compensation for his services as a former member of the Issuer's board of directors.</footnote>
        <footnote id="F5">The redeemable warrants are exercisable by clirSPV at any time on or after six (6) months after the date of the Purchase Agreement, or December 24, 2024, until June 24, 2029 at an exercise price per share equal to $1.05, subject to a 19.99% beneficial ownership blocker.</footnote>
        <footnote id="F6">The pre-funded warrants are exercisable by clirSPV at any time on or after the date of the Purchase Agreement, or June 24, 2024, until fully exercised at an exercise price per share equal to $0.0001, subject to a 19.99% beneficial ownership blocker. The pre-funded warrants have no expiration date</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Robert T. Hoffman, Sr.</signatureName>
        <signatureDate>2024-06-26</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Robert T. Hoffman, Sr. (clirSPV LLC)</signatureName>
        <signatureDate>2024-06-26</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Robert T. Hoffman, Sr. (GPCLIRSPV LLC)</signatureName>
        <signatureDate>2024-06-26</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Robert T. Hoffman, Sr. (PRINCETON OPPORTUNITY MANAGEMENT LLC)</signatureName>
        <signatureDate>2024-06-26</signatureDate>
    </ownerSignature>
</ownershipDocument>
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</SEC-DOCUMENT>
