-----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,
 KcSAJESD6EcMcMoTan34M9jHirmJBpaHOHxH7vX+efvJ0d8we3GpdoixBDHeaftH
 FiaaZ7U6vWf5j9uSFGb8Hw==

<SEC-DOCUMENT>0001352349-08-000002.txt : 20080520
<SEC-HEADER>0001352349-08-000002.hdr.sgml : 20080520
<ACCEPTANCE-DATETIME>20080520123416
ACCESSION NUMBER:		0001352349-08-000002
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20080519
FILED AS OF DATE:		20080520
DATE AS OF CHANGE:		20080520

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MANAGED HIGH YIELD PLUS FUND INC
		CENTRAL INDEX KEY:			0001060392
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			0531

	BUSINESS ADDRESS:	
		STREET 1:		C/O UBS GLOBAL ASSET MANAGEMENT (US) INC
		STREET 2:		51 WEST 52ND ST
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10019
		BUSINESS PHONE:		212 882 5575

	MAIL ADDRESS:	
		STREET 1:		51 WEST 52ND ST
		STREET 2:		C/O UBS GLOBAL ASSET MANAGEMENT (US) INC
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10019

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Higgins Heather R
		CENTRAL INDEX KEY:			0001352349

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	811-08765
		FILM NUMBER:		08847765

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		212.882.5576

	MAIL ADDRESS:	
		STREET 1:		51 WEST 52ND STREET, 14TH FLOOR
		STREET 2:		LEGAL & COMPLIANCE DEPARTMENT
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10019
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2008-05-19</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001060392</issuerCik>
        <issuerName>MANAGED HIGH YIELD PLUS FUND INC</issuerName>
        <issuerTradingSymbol>HYF</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001352349</rptOwnerCik>
            <rptOwnerName>Higgins Heather R</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>51 WEST 52ND STREET, 14TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2>LEGAL &amp; COMPLIANCE DEPARTMENT</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10019</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2008-05-19</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>12000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>3.7254</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <ownerSignature>
        <signatureName>/s/Heather R. Higgins (sig. affixed by Keith A. Weller as per POA)</signatureName>
        <signatureDate>2008-05-19</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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