-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 EZqTRXMMi1807voKQaQdEx6wxsxtQiLpybXyj5CSr8wCfEPwUAcz0kOpwt6mve/1
 9reIm8+bT+YnEVJ9ChVE1w==

<SEC-DOCUMENT>0001104659-09-040148.txt : 20090625
<SEC-HEADER>0001104659-09-040148.hdr.sgml : 20090625
<ACCEPTANCE-DATETIME>20090625200835
ACCESSION NUMBER:		0001104659-09-040148
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20090623
FILED AS OF DATE:		20090625
DATE AS OF CHANGE:		20090625

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			KLEINER PERKINS CAUFIELD & BYERS X B LP
		CENTRAL INDEX KEY:			0001128699
		STATE OF INCORPORATION:			CA
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-33923
		FILM NUMBER:		09910757

	BUSINESS ADDRESS:	
		STREET 1:		2750 SAND HILL ROAD
		CITY:			MENLO PARK
		STATE:			CA
		ZIP:			94025

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ArcSight Inc
		CENTRAL INDEX KEY:			0001368582
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-PREPACKAGED SOFTWARE [7372]
		IRS NUMBER:				522241535
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0430

	BUSINESS ADDRESS:	
		STREET 1:		5 Results Way
		CITY:			Cupertino
		STATE:			CA
		ZIP:			95014
		BUSINESS PHONE:		408-864-2600

	MAIL ADDRESS:	
		STREET 1:		5 Results Way
		CITY:			Cupertino
		STATE:			CA
		ZIP:			95014
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>a4.xml
<DESCRIPTION>4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2009-06-23</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001368582</issuerCik>
        <issuerName>ArcSight Inc</issuerName>
        <issuerTradingSymbol>ARST</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001128699</rptOwnerCik>
            <rptOwnerName>KLEINER PERKINS CAUFIELD &amp; BYERS X B LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O KLEINER PERKINS CAUFIELD &amp; BYERS</rptOwnerStreet1>
            <rptOwnerStreet2>2750 SAND HILL ROAD</rptOwnerStreet2>
            <rptOwnerCity>MENLO PARK</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94025</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>2009-06-23</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>11349</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>45396</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Pro rata distribution from Kleiner Perkins Caufield &amp; Byers X-B, L.P., to its partners</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Theodore E. Schlein, Manager of KPCB X Associates, LLC, General Partner of the Reporting Person</signatureName>
        <signatureDate>2009-06-23</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----