<SEC-DOCUMENT>0000749647-12-000046.txt : 20121219
<SEC-HEADER>0000749647-12-000046.hdr.sgml : 20121219
<ACCEPTANCE-DATETIME>20121219110829
ACCESSION NUMBER:		0000749647-12-000046
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20121218
FILED AS OF DATE:		20121219
DATE AS OF CHANGE:		20121219

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			WEAVER GREGORY L
		CENTRAL INDEX KEY:			0001251779

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-15911
		FILM NUMBER:		121273445

	MAIL ADDRESS:	
		STREET 1:		185 BERRY STREET
		STREET 2:		SUITE 6504
		CITY:			SAN FRANCISCO
		STATE:			CA
		ZIP:			94107

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Celsion CORP
		CENTRAL INDEX KEY:			0000749647
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				521256615
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		997 LENOX DRIVE
		STREET 2:		SUITE 100
		CITY:			LAWRENCEVILLE
		STATE:			NJ
		ZIP:			08648
		BUSINESS PHONE:		(609) 896-9100

	MAIL ADDRESS:	
		STREET 1:		997 LENOX DRIVE
		STREET 2:		SUITE 100
		CITY:			LAWRENCEVILLE
		STATE:			NJ
		ZIP:			08648

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	CELSION CORP
		DATE OF NAME CHANGE:	19980515

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	CHEUNG LABORATORIES INC
		DATE OF NAME CHANGE:	19920703
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2012-12-18</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000749647</issuerCik>
        <issuerName>Celsion CORP</issuerName>
        <issuerTradingSymbol>CLSN</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001251779</rptOwnerCik>
            <rptOwnerName>WEAVER GREGORY L</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O CELSION CORPORATION</rptOwnerStreet1>
            <rptOwnerStreet2>997 LENOX DRIVE, SUITE 100</rptOwnerStreet2>
            <rptOwnerCity>LAWRENCEVILLE</rptOwnerCity>
            <rptOwnerState>NJ</rptOwnerState>
            <rptOwnerZipCode>08648</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>SVP &amp; Chief Financial Officer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Celsion Corporation Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2012-12-18</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>8636</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>2.77</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>37272</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Warrants to purchase Celsion Corporation Common Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>2.77</value>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2012-12-18</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>X</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>8636</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>2.77</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2011-05-31</value>
            </exerciseDate>
            <expirationDate>
                <value>2017-11-25</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Celsion Corporation Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>8636</value>
                    <footnoteId id="F1"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The Officer purchased Celsion Corporation Common Stock through the exercise of warrants obtained in the May 2011 PIPE Stock Offering.  These warrants were fully exercisable with an exercise price of $2.77 per share.  The Officer has no immediate intent to sell these newly acquired shares.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Timothy J Tumminello, Controller and CAO</signatureName>
        <signatureDate>2012-12-19</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
