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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
 GT8cwBlh08aSxrTj79IEBWtIJ+xRtiw3KGSiGXERLD866povtUAeG4353e0su3hl
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<SEC-DOCUMENT>0001179110-08-009936.txt : 20080516
<SEC-HEADER>0001179110-08-009936.hdr.sgml : 20080516
<ACCEPTANCE-DATETIME>20080516144829
ACCESSION NUMBER:		0001179110-08-009936
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20080418
FILED AS OF DATE:		20080516
DATE AS OF CHANGE:		20080516

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BladeLogic, Inc.
		CENTRAL INDEX KEY:			0001175685
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-PREPACKAGED SOFTWARE [7372]
		IRS NUMBER:				043569976
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0930

	BUSINESS ADDRESS:	
		STREET 1:		10 MAGUIRE ROAD, BUILDING 3
		CITY:			LEXINGTON
		STATE:			MA
		ZIP:			02421
		BUSINESS PHONE:		781-257-3500

	MAIL ADDRESS:	
		STREET 1:		10 MAGUIRE ROAD, BUILDING 3
		CITY:			LEXINGTON
		STATE:			MA
		ZIP:			02421

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BLADELOGIC INC
		DATE OF NAME CHANGE:	20020617

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			TABORS R DAVID
		CENTRAL INDEX KEY:			0001199925

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-33589
		FILM NUMBER:		08841851

	BUSINESS ADDRESS:	
		STREET 1:		C/O BATTERY VENTURES
		STREET 2:		20 VILLIAM ST #200
		CITY:			WELLESLEY
		STATE:			MA
		ZIP:			02481
		BUSINESS PHONE:		7815771000

	MAIL ADDRESS:	
		STREET 1:		C/O BATTERY VENTURES
		STREET 2:		20 WILLIAM ST STE 200
		CITY:			WELLESLEY
		STATE:			MA
		ZIP:			02481
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>FORM 4 -
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2008-04-18</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001175685</issuerCik>
        <issuerName>BladeLogic, Inc.</issuerName>
        <issuerTradingSymbol>BLOG</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001199925</rptOwnerCik>
            <rptOwnerName>TABORS R DAVID</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O BATTERY VENTURES, RESERVOIR WOODS</rptOwnerStreet1>
            <rptOwnerStreet2>930 WINTER STREET, SUITE 2500</rptOwnerStreet2>
            <rptOwnerCity>WALTHAM</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02451</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2008-04-18</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>U</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>8798</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>28</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2008-04-18</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>U</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>2918765</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>28</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnote</value>
                    <footnoteId id="F1"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Of the reported securities, 2,802,015 were owned directly by Battery Ventures VI, L.P. (&quot;BV VI&quot;) and 116,750 were owned directly by Battery Investment Partners VI, LLC (&quot;BIP VI&quot;). BP VI is the general partner of BV VI. The managing members of BP VI are Thomas J. Crotty, Oliver D. Curme, Richard D. Frisbie, Morgan M. Jones, Kenneth P. Lawler, Mark H. Sherman, Scott R. Tobin and R. David Tabors. The managers of BIP VI are Thomas J. Crotty and Oliver D. Curme. Each of Messrs. Crotty, Curme, Frisbie, Jones, Lawler, Sherman, Tobin and Tabors disclaim beneficial ownership of these shares except to the extent of each of their individual pecuniary interest therein.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Chris Schiavo David R. Tabors By: Chris Schiavo Authorized signatory for David R. Tabors</signatureName>
        <signatureDate>2008-05-16</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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