-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 Nhp0VZ0TYIFkz2k2zntE4qm9l6nIRWXsQcT3xcUnQRrAY02hS1Ov+MybsE86P9J3
 kfhPf5VJuRu+oTwjA5VOAA==

<SEC-DOCUMENT>0000930413-11-001492.txt : 20110301
<SEC-HEADER>0000930413-11-001492.hdr.sgml : 20110301
<ACCEPTANCE-DATETIME>20110301161002
ACCESSION NUMBER:		0000930413-11-001492
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20110228
FILED AS OF DATE:		20110301
DATE AS OF CHANGE:		20110301

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Ogden Mark L
		CENTRAL INDEX KEY:			0001496873

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-12957
		FILM NUMBER:		11651709

	MAIL ADDRESS:	
		STREET 1:		C/O ENZON PHARAMCEUTICALS, INC.
		STREET 2:		685 ROUTE 202/206
		CITY:			BRIDGEWATER
		STATE:			NJ
		ZIP:			08807

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ENZON PHARMACEUTICALS INC
		CENTRAL INDEX KEY:			0000727510
		STANDARD INDUSTRIAL CLASSIFICATION:	BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
		IRS NUMBER:				222372868
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		685 ROUTE 202/206
		CITY:			BRIDGEWATER
		STATE:			NJ
		ZIP:			08807
		BUSINESS PHONE:		908 541 8671

	MAIL ADDRESS:	
		STREET 1:		685 ROUTE 202/206
		STREET 2:		ATT:  GENERAL COUNSEL
		CITY:			BRIDGEWATER
		STATE:			NJ
		ZIP:			08807

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ENZON PHARMACEUTICALS  INC
		DATE OF NAME CHANGE:	20021211

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ENZON PHARMACEUTICAL  INC
		DATE OF NAME CHANGE:	20021210

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ENZON INC
		DATE OF NAME CHANGE:	19920703
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>c64564_form4.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2011-02-28</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000727510</issuerCik>
        <issuerName>ENZON PHARMACEUTICALS INC</issuerName>
        <issuerTradingSymbol>ENZN</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001496873</rptOwnerCik>
            <rptOwnerName>Ogden Mark L</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O ENZON PHARAMCEUTICALS, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>685 ROUTE 202/206</rptOwnerStreet2>
            <rptOwnerCity>BRIDGEWATER</rptOwnerCity>
            <rptOwnerState>NJ</rptOwnerState>
            <rptOwnerZipCode>08807</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Acting VP of Fin &amp; Prin FO</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2011-02-28</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>2000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>10.649</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>4000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <ownerSignature>
        <signatureName>/s/ Mark L. Ogden</signatureName>
        <signatureDate>2011-03-01</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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