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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
 UwUfFvoHXScQ5sTM9eehoXgP6brezlWqXFujAl0hKd5H91loorTXLW/M8sEq51Rw
 t6KYVx7v4i2/t5w5/6TxYw==

<SEC-DOCUMENT>0000851520-07-000086.txt : 20070523
<SEC-HEADER>0000851520-07-000086.hdr.sgml : 20070523
<ACCEPTANCE-DATETIME>20070523215645
ACCESSION NUMBER:		0000851520-07-000086
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20070521
FILED AS OF DATE:		20070523
DATE AS OF CHANGE:		20070523

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			DENEND LESLIE G
		CENTRAL INDEX KEY:			0001073341
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-18655
		FILM NUMBER:		07875228

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		4088634019

	MAIL ADDRESS:	
		STREET 1:		C/O RATIONAL SOFTWARE CORP
		STREET 2:		18880 HOMESTEAD ROAD
		CITY:			CUPERTINO
		STATE:			CA
		ZIP:			95014

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			EXPONENT INC
		CENTRAL INDEX KEY:			0000851520
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-MANAGEMENT CONSULTING SERVICES [8742]
		IRS NUMBER:				770218904
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1230

	BUSINESS ADDRESS:	
		STREET 1:		EXPONENT INC
		STREET 2:		149 COMMONWEALTH DRIVE
		CITY:			MENLO PARK
		STATE:			CA
		ZIP:			94025
		BUSINESS PHONE:		650-326-9400

	MAIL ADDRESS:	
		STREET 1:		EXPONENT INC
		STREET 2:		149 COMMONWEALTH DRIVE
		CITY:			MENLO PARK
		STATE:			CA
		ZIP:			94025

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	FAILURE GROUP INC
		DATE OF NAME CHANGE:	19930831
</SEC-HEADER>
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<TYPE>4
<SEQUENCE>1
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    <schemaVersion>X0202</schemaVersion>

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    <periodOfReport>2007-05-21</periodOfReport>

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        <issuerName>EXPONENT INC</issuerName>
        <issuerTradingSymbol>EXPO</issuerTradingSymbol>
    </issuer>

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            <rptOwnerCik>0001073341</rptOwnerCik>
            <rptOwnerName>DENEND LESLIE G</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>149 COMMONWEATH DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>MENLO PARK</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94025</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
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            <securityTitle>
                <value>Common Stock</value>
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            <transactionDate>
                <value>2007-05-21</value>
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            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionAmounts>
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                </transactionShares>
                <transactionPricePerShare>
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                </sharesOwnedFollowingTransaction>
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        <nonDerivativeTransaction>
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    <derivativeTable>
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            <transactionDate>
                <value>2007-05-21</value>
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            <exerciseDate>
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            <expirationDate>
                <value>2007-06-02</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
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                <underlyingSecurityShares>
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            <ownershipNature>
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            <transactionDate>
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                <footnoteId id="F2"/>
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            <transactionAmounts>
                <transactionShares>
                    <value>1347</value>
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                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
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            <exerciseDate>
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            <expirationDate>
                <value>2008-06-01</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
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                <sharesOwnedFollowingTransaction>
                    <value>673</value>
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            </postTransactionAmounts>
            <ownershipNature>
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                    <value>D</value>
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                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F3"/>
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            <transactionAmounts>
                <transactionShares>
                    <value>547</value>
                </transactionShares>
                <transactionPricePerShare>
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                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
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            <exerciseDate>
                <footnoteId id="F5"/>
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            <expirationDate>
                <value>2009-05-24</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
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                </underlyingSecurityTitle>
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                    <value>547</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1093</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
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                    <value>D</value>
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            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Conversion to common stock of vested RSUs granted on June 2, 2004.</footnote>
        <footnote id="F2">Conversion to common stock of vested RSUs granted on June 1, 2005.</footnote>
        <footnote id="F3">Conversion to common stock of vested RSUs granted on May 24, 2006.</footnote>
        <footnote id="F4">1-for-1.</footnote>
        <footnote id="F5">Restricted stock units will vest in three (3) equal installments on the day prior to the Company's annual shareholder meeting.  Shares of Common Stock will be issued to the reporting person on the third vesting date.</footnote>
        <footnote id="F6">The share amount reflects a 2-for-1 stock split that occurred on May 24, 2006.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>By: Wendy Whitehouse  For: Leslie G. Denend</signatureName>
        <signatureDate>2007-05-23</signatureDate>
    </ownerSignature>
</ownershipDocument>
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</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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