<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0204</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2012-02-02</periodOfReport>

    <noSecuritiesOwned>1</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001397911</issuerCik>
        <issuerName>LPL Investment Holdings Inc.</issuerName>
        <issuerTradingSymbol>LPLA</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001375299</rptOwnerCik>
            <rptOwnerName>Goldstein Jeffrey A</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O LPL INVESTMENT HOLDINGS INC.</rptOwnerStreet1>
            <rptOwnerStreet2>ONE BEACON STREET</rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02108</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <footnotes></footnotes>

    <remarks>Securities reported do not include 34,213,364 shares of Common Stock of the Issuer beneficially owned by Hellman &amp; Friedman Capital Partners V, L.P. (&quot;HFCP V&quot;), Hellman &amp; Friedman Capital Partners V (Parallel), L.P. (&quot;HFCP V Parallel&quot;) and Hellman &amp; Friedman Capital Associates V, L.P. (&quot;Associates V&quot;).  Hellman &amp; Friedman Investors V, L.P. (&quot;Investors V&quot;) is the sole general partner of each of HFCP V and HFCP V Parallel.  Hellman &amp; Friedman LLC (&quot;H&amp;F LLC&quot; and, together with HFCP V, HFCP V Parallel, Associates V and Investors V, the &quot;H&amp;F Entities&quot;) is the sole general partner of each of Investors V and Associates V.  A four member investment committee of H&amp;F LLC has investment discretion over such shares.  The Reporting Person is a managing director of H&amp;F LLC, but he is not a member of the investment committee.  The Reporting Person disclaims beneficial ownership of the Common Stock of the Issuer beneficially owned by the HF Entities, except to the extent of his pecuniary interest, if any, therein.</remarks>

    <ownerSignature>
        <signatureName>/s/ Jeffrey A. Goldstein</signatureName>
        <signatureDate>2012-02-13</signatureDate>
    </ownerSignature>
</ownershipDocument>
