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

    <schemaVersion>X0306</schemaVersion>

    <documentType>5</documentType>

    <periodOfReport>2016-12-21</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <form3HoldingsReported>0</form3HoldingsReported>

    <form4TransactionsReported>0</form4TransactionsReported>

    <issuer>
        <issuerCik>0001082506</issuerCik>
        <issuerName>Great Elm Capital Group, Inc.</issuerName>
        <issuerTradingSymbol>GEC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001644077</rptOwnerCik>
            <rptOwnerName>Teksler Boris</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O GREAT ELM CAPITAL GROUP, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>200 CLARENDON ST. 51ST FLOOR</rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02116</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>See Remarks</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <footnotes></footnotes>

    <remarks>The reporting person's term as a member of Issuer's board of directors concluded on December 21, 2016.  As a result, the reporting person is no longer subject to Section 16 in connection with his transactions in the equity securities of Issuer and therefore will no longer report any such transactions on Form 4 or Form 5.

Former director and chief executive officer</remarks>

    <ownerSignature>
        <signatureName>/s/ Richard S. Chernicoff, as attorney-in-fact</signatureName>
        <signatureDate>2016-12-27</signatureDate>
    </ownerSignature>
</ownershipDocument>
