<SEC-DOCUMENT>0000921895-16-004701.txt : 20160526
<SEC-HEADER>0000921895-16-004701.hdr.sgml : 20160526
<ACCEPTANCE-DATETIME>20160526174356
ACCESSION NUMBER:		0000921895-16-004701
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20160525
FILED AS OF DATE:		20160526
DATE AS OF CHANGE:		20160526

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Actinium Pharmaceuticals, Inc.
		CENTRAL INDEX KEY:			0001388320
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				880378336
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		275 MADISON AVENUE, 7TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10016
		BUSINESS PHONE:		646-677-3875

	MAIL ADDRESS:	
		STREET 1:		275 MADISON AVENUE, 7TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10016

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Cactus Ventures, Inc.
		DATE OF NAME CHANGE:	20070130

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Memorial Sloan-Kettering Cancer Center
		CENTRAL INDEX KEY:			0001566787
		STATE OF INCORPORATION:			NY

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-36374
		FILM NUMBER:		161679421

	BUSINESS ADDRESS:	
		STREET 1:		1275 YORK AVE.
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10065
		BUSINESS PHONE:		212-639-2000

	MAIL ADDRESS:	
		STREET 1:		1275 YORK AVE.
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10065
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>form410109001_05262016.xml
<DESCRIPTION>OWNERSHIP DOCUMENT
<TEXT>
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        <issuerName>Actinium Pharmaceuticals, Inc.</issuerName>
        <issuerTradingSymbol>ATNM</issuerTradingSymbol>
    </issuer>

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            <rptOwnerCik>0001566787</rptOwnerCik>
            <rptOwnerName>Memorial Sloan-Kettering Cancer Center</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1275 YORK AVE.</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10065</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
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            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
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            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

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            <transactionAmounts>
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                <transactionPricePerShare>
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                <transactionShares>
                    <value>4600</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>1.91</value>
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                <transactionAcquiredDisposedCode>
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        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
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            <transactionDate>
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            <transactionCoding>
                <transactionFormType>4</transactionFormType>
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                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>100</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>1.92</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
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                <sharesOwnedFollowingTransaction>
                    <value>5416913</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
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                <directOrIndirectOwnership>
                    <value>D</value>
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        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <ownerSignature>
        <signatureName>/s/ Memorial Sloan-Kettering Cancer Center, By Mark Svenningson, its Sr. Vice President Finance and Controller</signatureName>
        <signatureDate>2016-05-26</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
