<?xml version="1.0"?><?xml-stylesheet type="text/xsl" href="../4_X02.xsl"?><ownershipDocument>    <schemaVersion>X0303</schemaVersion>    <documentType>4</documentType>    <periodOfReport>2008-08-19</periodOfReport>    <notSubjectToSection16>0</notSubjectToSection16>    <issuer>        <issuerCik>0000748790</issuerCik>        <issuerName>Global Clean Energy Holdings, Inc.</issuerName>        <issuerTradingSymbol>GCEH</issuerTradingSymbol>    </issuer>    <reportingOwner>        <reportingOwnerId>            <rptOwnerCik>0001413582</rptOwnerCik>            <rptOwnerName>Palmer Richard NMN</rptOwnerName>        </reportingOwnerId>        <reportingOwnerAddress>            <rptOwnerStreet1>3806 NEWTON ST.</rptOwnerStreet1>            <rptOwnerStreet2></rptOwnerStreet2>            <rptOwnerCity>TORRANC</rptOwnerCity>            <rptOwnerState>CA</rptOwnerState>            <rptOwnerZipCode>90505</rptOwnerZipCode>            <rptOwnerStateDescription></rptOwnerStateDescription>        </reportingOwnerAddress>        <reportingOwnerRelationship>            <isDirector>1</isDirector>            <isOfficer>1</isOfficer>            <isTenPercentOwner>1</isTenPercentOwner>            <isOther>0</isOther>            <officerTitle>Pres.&amp; Chief Operating Officer</officerTitle>        </reportingOwnerRelationship>    </reportingOwner>    <nonDerivativeTable>        <nonDerivativeTransaction>            <securityTitle>                <value>Common Stock</value>            </securityTitle>            <transactionDate>                <value>2008-08-19</value>            </transactionDate>            <transactionCoding>                <transactionFormType>4</transactionFormType>                <transactionCode>P</transactionCode>                <equitySwapInvolved>0</equitySwapInvolved>            </transactionCoding>            <transactionTimeliness>                <value></value>            </transactionTimeliness>            <transactionAmounts>                <transactionShares>                    <value>100000</value>                </transactionShares>                <transactionPricePerShare>                    <value>0.0596</value>                </transactionPricePerShare>                <transactionAcquiredDisposedCode>                    <value>A</value>                </transactionAcquiredDisposedCode>            </transactionAmounts>            <postTransactionAmounts>                <sharesOwnedFollowingTransaction>                    <value>9235037</value>                    <footnoteId id="F1"/>                </sharesOwnedFollowingTransaction>            </postTransactionAmounts>            <ownershipNature>                <directOrIndirectOwnership>                    <value>D</value>                </directOrIndirectOwnership>            </ownershipNature>        </nonDerivativeTransaction>        <nonDerivativeHolding>            <securityTitle>                <value>Common Stock</value>            </securityTitle>            <postTransactionAmounts>                <sharesOwnedFollowingTransaction>                    <value>54810220</value>                    <footnoteId id="F2"/>                    <footnoteId id="F3"/>                </sharesOwnedFollowingTransaction>            </postTransactionAmounts>            <ownershipNature>                <directOrIndirectOwnership>                    <value>I</value>                </directOrIndirectOwnership>                <natureOfOwnership>                    <value>By Mobius Risk Group, LLC</value>                    <footnoteId id="F4"/>                </natureOfOwnership>            </ownershipNature>        </nonDerivativeHolding>    </nonDerivativeTable>    <footnotes>        <footnote id="F1">652,504 of the shares of Issuer are subject to forfeiture in the event that the Issuer has not achieved a certain market capitalization threshold by September 7, 2009 (&quot;Market Condition&quot;).</footnote>        <footnote id="F2">These shares are held by Mobius Risk Group, LLC, a Texas limited liabilty company (&quot;Mobius&quot;).  Reportig Person owns 13.33% of the issued and outstanding membership interests of Mobius.</footnote>        <footnote id="F3">3,915,016 shares of Issuer held by Mobius are subject to forfeiture in the event that the Issuer has not satisfied the Market Condition.</footnote>        <footnote id="F4">The Reporting Person disclaims beneficial ownership of the securities held by Mobius.</footnote>    </footnotes>    <ownerSignature>        <signatureName>/s/ Richard Palmer</signatureName>        <signatureDate>2008-08-20</signatureDate>    </ownerSignature></ownershipDocument>