<SEC-DOCUMENT>0000935836-25-000728.txt : 20251219
<SEC-HEADER>0000935836-25-000728.hdr.sgml : 20251219
<ACCEPTANCE-DATETIME>20251219180055
ACCESSION NUMBER:		0000935836-25-000728
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20251217
FILED AS OF DATE:		20251219
DATE AS OF CHANGE:		20251219

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Lau Daniel
		CENTRAL INDEX KEY:			0001950123
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-34018
		FILM NUMBER:		251588776

	MAIL ADDRESS:	
		STREET 1:		915 1055 WEST HASTINGS STREET
		CITY:			VANCOUVER
		STATE:			A1
		ZIP:			V6E 2E9

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			GRAN TIERRA ENERGY INC.
		CENTRAL INDEX KEY:			0001273441
		STANDARD INDUSTRIAL CLASSIFICATION:	CRUDE PETROLEUM & NATURAL GAS [1311]
		ORGANIZATION NAME:           	01 Energy & Transportation
		EIN:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		500 CENTRE STREET SE
		CITY:			CALGARY
		STATE:			A0
		ZIP:			T2G 1A6
		BUSINESS PHONE:		(403) 265-3221

	MAIL ADDRESS:	
		STREET 1:		500 CENTRE STREET SE
		CITY:			CALGARY
		STATE:			A0
		ZIP:			T2G 1A6

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	GRAN TIERRA ENERGY, INC.
		DATE OF NAME CHANGE:	20051130

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	GOLDSTRIKE INC
		DATE OF NAME CHANGE:	20040113

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	GOLKSTRIKE INC
		DATE OF NAME CHANGE:	20031216
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>ownership.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2025-12-17</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001273441</issuerCik>
        <issuerName>GRAN TIERRA ENERGY INC.</issuerName>
        <issuerTradingSymbol>GTE</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001950123</rptOwnerCik>
            <rptOwnerName>Lau Daniel</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>915 1055 WEST HASTINGS STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>VANCOUVER</rptOwnerCity>
            <rptOwnerState>A1</rptOwnerState>
            <rptOwnerZipCode>V6E 2E9</rptOwnerZipCode>
            <rptOwnerStateDescription>BRITISH COLUMBIA, CANADA</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>240000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3171200</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Note</value>
                    <footnoteId id="F1"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>145000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Note</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">These securities are held by private investment funds managed by an investment advisory firm of which Mr. Lau is a control person. He disclaims beneficial ownership of such securities except to the extent of his pecuniary interest therein.</footnote>
        <footnote id="F2">These securities are held by companies of which Mr. Lau is a director and controlling shareholder. He disclaims beneficial ownership of such securities except to the extent of his pecuniary interest therein.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Daniel Lau</signatureName>
        <signatureDate>2025-12-19</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
