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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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<SEC-DOCUMENT>0001169232-03-007060.txt : 20031215
<SEC-HEADER>0001169232-03-007060.hdr.sgml : 20031215
<ACCEPTANCE-DATETIME>20031215171932
ACCESSION NUMBER:		0001169232-03-007060
CONFORMED SUBMISSION TYPE:	5
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20031130
FILED AS OF DATE:		20031215

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ECOGEN INC
		CENTRAL INDEX KEY:			0000814050
		STANDARD INDUSTRIAL CLASSIFICATION:	AGRICULTURE CHEMICALS [2870]
		IRS NUMBER:				222487948
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1031

	BUSINESS ADDRESS:	
		STREET 1:		2000 CABOT BLVD W #170
		CITY:			LANGHORNE
		STATE:			PA
		ZIP:			19047-1811
		BUSINESS PHONE:		2157571590

	MAIL ADDRESS:	
		STREET 1:		2005 CABOT BLVD W
		CITY:			LANGHORNE
		STATE:			PA
		ZIP:			19047

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			MARX MOSES
		CENTRAL INDEX KEY:			0000941992

	FILING VALUES:
		FORM TYPE:		5
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-09579
		FILM NUMBER:		031055356

	BUSINESS ADDRESS:	
		STREET 1:		160 BROADWAY
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10038
		BUSINESS PHONE:		2123492875

	MAIL ADDRESS:	
		STREET 1:		160 BROADWAY
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10038
</SEC-HEADER>
<DOCUMENT>
<TYPE>5
<SEQUENCE>1
<FILENAME>d03-57721_ex.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<!-- - EDGAR Ease Plus 1.0                                   07/25/03  TT    -->
<ownershipDocument>
    <schemaVersion>X0201</schemaVersion>

    <documentType>5</documentType>
   <periodOfReport>2003-11-30</periodOfReport>
   <notSubjectToSection16>0</notSubjectToSection16>
    <form3HoldingsReported>0</form3HoldingsReported>

    <form4TransactionsReported>0</form4TransactionsReported>

    <issuer>
        <issuerCik>0000814050</issuerCik>
        <issuerName>ECOGEN INC</issuerName>
        <issuerTradingSymbol>ECGN</issuerTradingSymbol>
   </issuer>
   <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000941992</rptOwnerCik>
            <rptOwnerName>MARX MOSES</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>160 BROADWAY</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10038</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
         <isDirector>0</isDirector>
         <isOfficer>0</isOfficer>
         <isTenPercentOwner>1</isTenPercentOwner>
         <isOther>0</isOther>
      </reportingOwnerRelationship>
   </reportingOwner>
 <nonDerivativeTable>
   <nonDerivativeTransaction>
      <securityTitle>
         <value>Common Stock</value>
      </securityTitle>
      <transactionDate>
         <value>2002-12-30</value>
      </transactionDate>
      <transactionCoding>
         <transactionFormType>5</transactionFormType>
         <transactionCode>J</transactionCode>
         <equitySwapInvolved>0</equitySwapInvolved>
      </transactionCoding>
      <transactionAmounts>
         <transactionShares>
           <value>22500000</value>
            <footnoteId id="F1"/>
         </transactionShares>
         <transactionPricePerShare>
           <value>0</value>
         </transactionPricePerShare>
         <transactionAcquiredDisposedCode>
           <value>D</value>
         </transactionAcquiredDisposedCode>
      </transactionAmounts>
      <postTransactionAmounts>
         <sharesOwnedFollowingTransaction>
           <value>0</value>
         </sharesOwnedFollowingTransaction>
      </postTransactionAmounts>
      <ownershipNature>
         <directOrIndirectOwnership>
            <value>I</value>
         </directOrIndirectOwnership>
         <natureOfOwnership>
            <value>By United Equities (Commodities) Company</value>
         </natureOfOwnership>
      </ownershipNature>
   </nonDerivativeTransaction>
   <nonDerivativeTransaction>
      <securityTitle>
         <value>Common Stock</value>
      </securityTitle>
      <transactionDate>
         <value>2002-12-30</value>
      </transactionDate>
      <transactionCoding>
         <transactionFormType>5</transactionFormType>
         <transactionCode>J</transactionCode>
         <equitySwapInvolved>0</equitySwapInvolved>
      </transactionCoding>
      <transactionAmounts>
         <transactionShares>
           <value>22500000</value>
         </transactionShares>
         <transactionPricePerShare>
           <value>0</value>
         </transactionPricePerShare>
         <transactionAcquiredDisposedCode>
           <value>A</value>
         </transactionAcquiredDisposedCode>
      </transactionAmounts>
      <postTransactionAmounts>
         <sharesOwnedFollowingTransaction>
           <value>22500000</value>
            <footnoteId id="F1"/>
         </sharesOwnedFollowingTransaction>
      </postTransactionAmounts>
      <ownershipNature>
         <directOrIndirectOwnership>
            <value>I</value>
         </directOrIndirectOwnership>
         <natureOfOwnership>
            <value>By ECN Holdings LLC</value>
         </natureOfOwnership>
      </ownershipNature>
   </nonDerivativeTransaction>
 </nonDerivativeTable>
 <derivativeTable>
   <derivativeTransaction>
      <securityTitle>
         <value>8% Series 1998-C Convertible Preferred Stock</value>
      </securityTitle>
      <conversionOrExercisePrice>
            <footnoteId id="F2"/>
      </conversionOrExercisePrice>
      <transactionDate>
         <value>2002-12-30</value>
      </transactionDate>
      <transactionCoding>
         <transactionFormType>5</transactionFormType>
         <transactionCode>J</transactionCode>
         <equitySwapInvolved>0</equitySwapInvolved>
      </transactionCoding>
      <transactionAmounts>
         <transactionShares>
           <value>10854</value>
            <footnoteId id="F1"/>
         </transactionShares>
         <transactionPricePerShare>
           <value>0</value>
         </transactionPricePerShare>
         <transactionAcquiredDisposedCode>
           <value>D</value>
         </transactionAcquiredDisposedCode>
      </transactionAmounts>
      <exerciseDate>
         <value>1999-08-29</value>
      </exerciseDate>
      <expirationDate>
            <footnoteId id="F6"/>
      </expirationDate>
      <underlyingSecurity>
         <underlyingSecurityTitle>
           <value>Common Stock</value>
         </underlyingSecurityTitle>
         <underlyingSecurityValue>
            <footnoteId id="F3"/>
         </underlyingSecurityValue>
      </underlyingSecurity>
      <postTransactionAmounts>
         <sharesOwnedFollowingTransaction>
           <value>0</value>
         </sharesOwnedFollowingTransaction>
      </postTransactionAmounts>
      <ownershipNature>
         <directOrIndirectOwnership>
           <value>I</value>
         </directOrIndirectOwnership>
         <natureOfOwnership>
           <value>By United Equities (Commodities) Company</value>
         </natureOfOwnership>
      </ownershipNature>
   </derivativeTransaction>
   <derivativeTransaction>
      <securityTitle>
         <value>8% Series 1998-C Convertible Preferred Stock</value>
      </securityTitle>
      <conversionOrExercisePrice>
            <footnoteId id="F2"/>
      </conversionOrExercisePrice>
      <transactionDate>
         <value>2002-12-30</value>
      </transactionDate>
      <transactionCoding>
         <transactionFormType>5</transactionFormType>
         <transactionCode>J</transactionCode>
         <equitySwapInvolved>0</equitySwapInvolved>
      </transactionCoding>
      <transactionAmounts>
         <transactionShares>
           <value>10854</value>
         </transactionShares>
         <transactionPricePerShare>
           <value>0</value>
         </transactionPricePerShare>
         <transactionAcquiredDisposedCode>
           <value>A</value>
         </transactionAcquiredDisposedCode>
      </transactionAmounts>
      <exerciseDate>
         <value>1999-08-29</value>
      </exerciseDate>
      <expirationDate>
            <footnoteId id="F6"/>
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      <underlyingSecurity>
         <underlyingSecurityTitle>
           <value>Common Stock</value>
         </underlyingSecurityTitle>
         <underlyingSecurityValue>
            <footnoteId id="F3"/>
         </underlyingSecurityValue>
      </underlyingSecurity>
      <postTransactionAmounts>
         <sharesOwnedFollowingTransaction>
           <value>10854</value>
         </sharesOwnedFollowingTransaction>
      </postTransactionAmounts>
      <ownershipNature>
         <directOrIndirectOwnership>
           <value>I</value>
         </directOrIndirectOwnership>
         <natureOfOwnership>
           <value>By ECN Holdings LLC</value>
         </natureOfOwnership>
      </ownershipNature>
   </derivativeTransaction>
   <derivativeTransaction>
      <securityTitle>
         <value>7% Series 2000-A Convertible Preferred Stock</value>
      </securityTitle>
      <conversionOrExercisePrice>
            <footnoteId id="F4"/>
      </conversionOrExercisePrice>
      <transactionDate>
         <value>2002-12-30</value>
      </transactionDate>
      <transactionCoding>
         <transactionFormType>5</transactionFormType>
         <transactionCode>J</transactionCode>
         <equitySwapInvolved>0</equitySwapInvolved>
      </transactionCoding>
      <transactionAmounts>
         <transactionShares>
           <value>4345</value>
            <footnoteId id="F1"/>
         </transactionShares>
         <transactionPricePerShare>
           <value>0</value>
         </transactionPricePerShare>
         <transactionAcquiredDisposedCode>
           <value>D</value>
         </transactionAcquiredDisposedCode>
      </transactionAmounts>
      <exerciseDate>
         <value>2002-10-01</value>
      </exerciseDate>
      <expirationDate>
            <footnoteId id="F6"/>
      </expirationDate>
      <underlyingSecurity>
         <underlyingSecurityTitle>
           <value>Common Stock</value>
         </underlyingSecurityTitle>
         <underlyingSecurityValue>
            <footnoteId id="F5"/>
         </underlyingSecurityValue>
      </underlyingSecurity>
      <postTransactionAmounts>
         <sharesOwnedFollowingTransaction>
           <value>0</value>
         </sharesOwnedFollowingTransaction>
      </postTransactionAmounts>
      <ownershipNature>
         <directOrIndirectOwnership>
           <value>I</value>
         </directOrIndirectOwnership>
         <natureOfOwnership>
           <value>By United Equities (Commodities) Company</value>
         </natureOfOwnership>
      </ownershipNature>
   </derivativeTransaction>
   <derivativeTransaction>
      <securityTitle>
         <value>7% Series 2000-A Convertible Preferred Stock</value>
      </securityTitle>
      <conversionOrExercisePrice>
            <footnoteId id="F4"/>
      </conversionOrExercisePrice>
      <transactionDate>
         <value>2002-12-30</value>
      </transactionDate>
      <transactionCoding>
         <transactionFormType>5</transactionFormType>
         <transactionCode>J</transactionCode>
         <equitySwapInvolved>0</equitySwapInvolved>
      </transactionCoding>
      <transactionAmounts>
         <transactionShares>
           <value>4345</value>
         </transactionShares>
         <transactionPricePerShare>
           <value>0</value>
         </transactionPricePerShare>
         <transactionAcquiredDisposedCode>
           <value>A</value>
         </transactionAcquiredDisposedCode>
      </transactionAmounts>
      <exerciseDate>
         <value>2002-10-01</value>
      </exerciseDate>
      <expirationDate>
            <footnoteId id="F6"/>
      </expirationDate>
      <underlyingSecurity>
         <underlyingSecurityTitle>
           <value>Common Stock</value>
         </underlyingSecurityTitle>
         <underlyingSecurityValue>
            <footnoteId id="F5"/>
         </underlyingSecurityValue>
      </underlyingSecurity>
      <postTransactionAmounts>
         <sharesOwnedFollowingTransaction>
           <value>4345</value>
         </sharesOwnedFollowingTransaction>
      </postTransactionAmounts>
      <ownershipNature>
         <directOrIndirectOwnership>
           <value>I</value>
         </directOrIndirectOwnership>
         <natureOfOwnership>
           <value>By ECN Holdings LLC</value>
         </natureOfOwnership>
      </ownershipNature>
   </derivativeTransaction>
 </derivativeTable>
   <footnotes>
      <footnote id="F1"> Represents change in the nature of beneficial ownership of securities owned by the Reporting Person from indirect ownership through United Equities (Commodities) Company to indirect ownership through ECN Holdings LLC</footnote>

      <footnote id="F2"> The conversion price for each share of Preferred Stock in effect on any conversion date is the lesser of (a) $2.125, and (b) the average of the Per Share Market Values, as defined in the Certificate of Designation for the Preferred Stock, for the five (5) consecutive trading days immediately preceding the applicable conversion date.</footnote>

      <footnote id="F3"> Varies depending on the conversion price as set forth in Note (2).</footnote>

      <footnote id="F4"> The conversion price for each share of Series 2000-A Convertible Preferred Stock in effect on any conversion date is the lesser of (a) 120% of the average Per Share Market Values , as defined in the Certificate of Designations for the Series 2000-A Convertible Preferred Stock, for the ten trading days immediately preceding the original issue date and (b) 95% of the average of the three lowest Per Share Market Values during the twenty consecutive trading day period immediately preceding the applicable conversion date; provided that such twenty day trading period may be extended as provided in the Certificate of Designations for the Series 2000-A Convertible Preferred Stock</footnote>

      <footnote id="F5"> Varies depending on the conversion price as set forth in Note (4).</footnote>

      <footnote id="F6"> Exercisable so long as the Preferred Stock is outstanding.</footnote>
   </footnotes>
   <ownerSignature>
      <signatureName>/s/ Moses Marx</signatureName>
      <signatureDate>2003-12-12</signatureDate>
   </ownerSignature>
</ownershipDocument>

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</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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