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        <issuerTradingSymbol>TWOU</issuerTradingSymbol>
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    <nonDerivativeTable>
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            <ownershipNature>
                <directOrIndirectOwnership>
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                <natureOfOwnership>
                    <value>See footnote</value>
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                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
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            <transactionAmounts>
                <transactionShares>
                    <value>475899</value>
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                <transactionPricePerShare>
                    <footnoteId id="F5"/>
                    <footnoteId id="F6"/>
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            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnote</value>
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                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
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                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness>
                <value></value>
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            <transactionAmounts>
                <transactionShares>
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                <transactionPricePerShare>
                    <footnoteId id="F5"/>
                    <footnoteId id="F6"/>
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                    <value>319914</value>
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            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnote</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
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                </transactionShares>
                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
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                <footnoteId id="F6"/>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
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                <natureOfOwnership>
                    <value>See footnote</value>
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                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
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                <footnoteId id="F6"/>
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            <ownershipNature>
                <directOrIndirectOwnership>
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                <natureOfOwnership>
                    <value>See footnote</value>
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                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
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                <footnoteId id="F5"/>
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            <transactionAmounts>
                <transactionShares>
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                </transactionShares>
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                <transactionAcquiredDisposedCode>
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            <exerciseDate>
                <footnoteId id="F5"/>
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            <expirationDate>
                <footnoteId id="F5"/>
                <footnoteId id="F6"/>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
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                <underlyingSecurityShares>
                    <value>319914</value>
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                    <value>0</value>
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            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnote</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The securities are held by Highland Capital Partners VII Limited Partnership (&quot;HCP VII&quot;).  Highland Management Partners VII, LLC (&quot;HMP VII LLC&quot;) is the general partner of Highland Management Partnership VII Limited Partnership (&quot;HMP VII LP&quot;), which is the general partner of HCP VII.  Each of HMP VII LP and HMP VII LLC disclaims beneficial ownership of all shares held by HCP VII except to the extent, if any, of such entity's pecuniary interest therein.</footnote>
        <footnote id="F2">The securities are held by Highland Capital Partners VII-B Limited Partnership (&quot;HCP VII-B&quot;).  HMP VII LP is the general partner of HCP VII-B.  Each of HMP VII LP and HMP VII LLC disclaims beneficial ownership of all shares held by HCP VII-B except to the extent, if any, of such entity's pecuniary interest therein.</footnote>
        <footnote id="F3">The securities are held by Highland Capital Partners VII-C Limited Partnership (&quot;HCP VII-C&quot;).  HMP VII LP is the general partner of HCP VII-C.  Each of HMP VII LP and HMP VII LLC disclaims beneficial ownership of all shares held by HCP VII-C except to the extent, if any, of such entity's pecuniary interest therein.</footnote>
        <footnote id="F4">The securities are held by Highland Entrepreneurs' Fund VII Limited Partnership (&quot;HEF VII&quot;).  HMP VII LP is the general partner of HEF VII.  Each of HMP VII LP and HMP VII LLC disclaims beneficial ownership of all shares held by HEF VII except to the extent, if any, of such entity's pecuniary interest therein.</footnote>
        <footnote id="F5">HCP VII was the holder of record of 1,689,070 shares of Series B Preferred Stock, 292,583 shares of Series C Preferred Stock and 196,683 shares of Series D Preferred Stock, which were converted into 2,178,336 shares of Common Stock.  HCP VII-B was the holder of record of 409,294 shares of Series B Preferred Stock, 70,898, shares of Series C Preferred Stock and 47,660 shares of Series D Preferred Stock, which were converted into 527,852 shares of Common Stock. HCP VII-C was the holder of record of 596,062 shares of Series B Preferred Stock, 103,250 shares of Series C Preferred Stock and 69,408 shares of Series D Preferred Stock, which were converted into 768,720 shares of Common Stock.  Immediately prior to the closing of the Issuer's initial public offering, each share of the Preferred Stock automatically converted into Common Stock on a one-for-one basis, and has no expiration date.</footnote>
        <footnote id="F6">HEF VII was the holder of record of 52,926 shares of Series B Preferred Stock, 9,168 shares of Series C Preferred Stock and 6,163 shares of Series D Preferred Stock, which were converted into 68,257 shares of Common Stock.  Immediately prior to the closing of the Issuer's initial public offering, each share of the Preferred Stock automatically converted into Common Stock on a one-for-one basis, and has no expiration date.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Paul Maeder, Authorized Manager of Highland Management Partners VII, LLC</signatureName>
        <signatureDate>2014-04-02</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Paul Maeder, Authorized Manager of Highland Management Partners VII, LLC, the general partner of Highland Management Partners VII Limited Partnership</signatureName>
        <signatureDate>2014-04-02</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Paul Maeder, Authorized Manager of Highland Management Partners VII, LLC, the general partner of Highland Management Partners VII Limited Partnership, the general partner of Highland Capital Partners VII Limited Partnership</signatureName>
        <signatureDate>2014-04-02</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Paul Maeder, Authorized Manager of Highland Management Partners VII, LLC, the general partner of Highland Management Partners VII Limited Partnership, the general partner of Highland Capital Partners VII-B Limited Partnership</signatureName>
        <signatureDate>2014-04-02</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Paul Maeder, Authorized Manager of Highland Management Partners VII, LLC, the general partner of Highland Management Partners VII Limited Partnership, the general partner of Highland Capital Partners VII-C Limited Partnership</signatureName>
        <signatureDate>2014-04-02</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Paul Maeder, Authorized Manager of Highland Management Partners VII, LLC, the general partner of Highland Management Partners VII Limited Partnership, the general partner of Highland Entrepreneurs' Fund VII Limited Partnership</signatureName>
        <signatureDate>2014-04-02</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
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</SUBMISSION>
