<SUBMISSION>
<ACCESSION-NUMBER>0001104659-10-046367
<TYPE>4
<PUBLIC-DOCUMENT-COUNT>1
<PERIOD>20100825
<FILING-DATE>20100827
<DATE-OF-FILING-DATE-CHANGE>20100827
<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME>KERREST JACQUES
<CIK>0001221273
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE>4
<ACT>34
<FILE-NUMBER>001-34137
<FILM-NUMBER>101045220
</FILING-VALUES>
<MAIL-ADDRESS>
<STREET1>7436 OLD MAPLE SQUARE
<CITY>MCLEAN
<STATE>VA
<ZIP>22102-2817
</MAIL-ADDRESS>
</REPORTING-OWNER>
<ISSUER>
<COMPANY-DATA>
<CONFORMED-NAME>ACTIVIDENTITY CORP
<CIK>0001183941
<ASSIGNED-SIC>7372
<IRS-NUMBER>450485038
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>0930
</COMPANY-DATA>
<BUSINESS-ADDRESS>
<STREET1>6623 DUMBARTON CIRCLE
<CITY>FREMONT
<STATE>CA
<ZIP>94555
<PHONE>5105741792
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>6623 DUMBARTON CIRCLE
<CITY>FREMONT
<STATE>CA
<ZIP>94555
</MAIL-ADDRESS>
<FORMER-COMPANY>
<FORMER-CONFORMED-NAME>ACTIVCARD CORP
<DATE-CHANGED>20020828
</FORMER-COMPANY>
</ISSUER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>a4.xml
<DESCRIPTION>4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2010-08-25</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001183941</issuerCik>
        <issuerName>ACTIVIDENTITY CORP</issuerName>
        <issuerTradingSymbol>ACTI</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001221273</rptOwnerCik>
            <rptOwnerName>KERREST JACQUES</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O ACTIVIDENTITY CORPORATION</rptOwnerStreet1>
            <rptOwnerStreet2>6623 DUMBARTON CIRCLE</rptOwnerStreet2>
            <rptOwnerCity>FREMONT</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94555</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>CFO and COO</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2010-08-25</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>103092</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>188092</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Award of Restricted Stock Units (&quot;RSUs&quot;) under the Issuer's 2004 Equity Incentive Plan that vests over four years with 25% of the RSUs vesting on the first anniversary of the Vesting Commencement Date and 1/36th of the remaining RSUs vesting each month thereafter on the same day of the month as the Vesting Commencement Date such that all RSUs are fully vested on the fourth anniversary of the Vesting Commencement Date.  The shares of Common Stock underlying such award will be issued to the Reporting Person in accordance with such vesting schedule.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Jacques Kerrest</signatureName>
        <signatureDate>2010-08-27</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SUBMISSION>
