<SEC-DOCUMENT>0001104659-17-003636.txt : 20170123
<SEC-HEADER>0001104659-17-003636.hdr.sgml : 20170123
<ACCEPTANCE-DATETIME>20170123212149
ACCESSION NUMBER:		0001104659-17-003636
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20170120
FILED AS OF DATE:		20170123
DATE AS OF CHANGE:		20170123

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			LEAP THERAPEUTICS, INC.
		CENTRAL INDEX KEY:			0001509745
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				274412575
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		47 THORNDIKE STREET
		STREET 2:		SUITE B1-1
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02142
		BUSINESS PHONE:		617 252 4343

	MAIL ADDRESS:	
		STREET 1:		47 THORNDIKE STREET
		STREET 2:		SUITE B1-1
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02142

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Dekkun Corp
		DATE OF NAME CHANGE:	20110107

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			WERNER HAROLD R
		CENTRAL INDEX KEY:			0001013603

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-37990
		FILM NUMBER:		17542379

	MAIL ADDRESS:	
		STREET 1:		C/O HEALTHCARE VENTURES LLC
		STREET 2:		44 NASSAU STREET
		CITY:			PRINCETON
		STATE:			NJ
		ZIP:			08542

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			HealthCare Partners VIII, LLC
		CENTRAL INDEX KEY:			0001358992
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-37990
		FILM NUMBER:		17542380

	BUSINESS ADDRESS:	
		STREET 1:		44 NASSAU STREET
		CITY:			PRINCETON
		STATE:			NJ
		ZIP:			08542
		BUSINESS PHONE:		609-430-3913

	MAIL ADDRESS:	
		STREET 1:		44 NASSAU STREET
		CITY:			PRINCETON
		STATE:			NJ
		ZIP:			08542

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			HealthCare Partners VIII, L.P.
		CENTRAL INDEX KEY:			0001358991
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-37990
		FILM NUMBER:		17542381

	BUSINESS ADDRESS:	
		STREET 1:		44 NASSAU STREET
		CITY:			PRINCETON
		STATE:			NJ
		ZIP:			08542
		BUSINESS PHONE:		609-430-3913

	MAIL ADDRESS:	
		STREET 1:		44 NASSAU STREET
		CITY:			PRINCETON
		STATE:			NJ
		ZIP:			08542

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			HealthCare Ventures VIII, L.P.
		CENTRAL INDEX KEY:			0001358990
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-37990
		FILM NUMBER:		17542382

	BUSINESS ADDRESS:	
		STREET 1:		44 NASSAU STREET
		CITY:			PRINCETON
		STATE:			NJ
		ZIP:			08542
		BUSINESS PHONE:		609-430-3913

	MAIL ADDRESS:	
		STREET 1:		44 NASSAU STREET
		CITY:			PRINCETON
		STATE:			NJ
		ZIP:			08542
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>a3.xml
<DESCRIPTION>3
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2017-01-20</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001509745</issuerCik>
        <issuerName>LEAP THERAPEUTICS, INC.</issuerName>
        <issuerTradingSymbol>LPTX</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001358990</rptOwnerCik>
            <rptOwnerName>HealthCare Ventures VIII, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O LEAP THERAPEUTICS, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>47 THORNDIKE STREET SUITE B1-1</rptOwnerStreet2>
            <rptOwnerCity>CAMBRIDGE</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02141</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001358991</rptOwnerCik>
            <rptOwnerName>HealthCare Partners VIII, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O LEAP THERAPEUTICS, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>47 THORNDIKE STREET SUITE B1-1</rptOwnerStreet2>
            <rptOwnerCity>CAMBRIDGE</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02141</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001358992</rptOwnerCik>
            <rptOwnerName>HealthCare Partners VIII, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O LEAP THERAPEUTICS, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>47 THORNDIKE STREET SUITE B1-1</rptOwnerStreet2>
            <rptOwnerCity>CAMBRIDGE</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02141</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001013603</rptOwnerCik>
            <rptOwnerName>WERNER HAROLD R</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O LEAP THERAPEUTICS, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>47 THORNDIKE STREET SUITE B1-1</rptOwnerStreet2>
            <rptOwnerCity>CAMBRIDGE</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02141</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>2618406</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F1"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">2,618,406 shares are held of record by HealthCare Ventures VIII, L.P. Christopher K. Mirabelli, James H. Cavanaugh, John W. Littlechild, Harold Werner and Augustine Lawlor (collectively, the &quot;HCVVIII Directors&quot;) are the Managing Directors of HealthCare Partners VIII, LLC (&quot;HCPVIII LLC&quot;), which is the General Partner of HealthCare Partners VIII, L.P. (&quot;HCPVIII&quot;), which is the General Partner of HealthCare Ventures VIII, L.P. Each of the HCVVIII Directors, including Harold Werner, HCPVIII LLC and HCPVIII indirectly beneficially own and share voting and dispositive power with respect to all of the securities owned by HealthCare Ventures VIII, L.P and disclaims beneficial ownership of these shares except to the extent of his  or its proportionate pecuniary interest in these securities.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Jeffrey Steinberg as Administrative Officer for HealthCare Partners VIII, LLC</signatureName>
        <signatureDate>2017-01-23</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Jeffrey Steinberg as Administrative Officer for HealthCare Partners VIII, LLC, the General Partner of HealthCare Partners VIII, L.P.</signatureName>
        <signatureDate>2017-01-23</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Jeffrey Steinberg as Administrative Officer for HealthCare Partners VIII, LLC, the General Partner of HealthCare Partners VIII, L.P., the General Partner of HealthCare Ventures VIII, L.P.</signatureName>
        <signatureDate>2017-01-23</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Jeffrey Steinberg as attorney-in-fact for Harold Werner</signatureName>
        <signatureDate>2017-01-23</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
