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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2019-01-04</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0001697152</issuerCik>
        <issuerName>ConvergeOne Holdings, Inc.</issuerName>
        <issuerTradingSymbol>CVON</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001409564</rptOwnerCik>
            <rptOwnerName>Eghbali Behdad</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O CLEARLAKE CAPITAL GROUP, L.P.</rptOwnerStreet1>
            <rptOwnerStreet2>233 WILSHIRE BLVD, SUITE 800</rptOwnerStreet2>
            <rptOwnerCity>SANTA MONICA</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90401</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001323912</rptOwnerCik>
            <rptOwnerName>Feliciano Jose Enrique</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O CLEARLAKE CAPITAL GROUP, L.P.</rptOwnerStreet1>
            <rptOwnerStreet2>233 WILSHIRE BLVD, SUITE 800</rptOwnerStreet2>
            <rptOwnerCity>SANTA MONICA</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90401</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001730848</rptOwnerCik>
            <rptOwnerName>Clearlake Capital Partners III (Master), L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O CLEARLAKE CAPITAL GROUP, L.P.</rptOwnerStreet1>
            <rptOwnerStreet2>233 WILSHIRE BLVD, SUITE 800</rptOwnerStreet2>
            <rptOwnerCity>SANTA MONICA</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90401</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001730838</rptOwnerCik>
            <rptOwnerName>Clearlake Capital Partners III, GP, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O CLEARLAKE CAPITAL GROUP, L.P.</rptOwnerStreet1>
            <rptOwnerStreet2>233 WILSHIRE BLVD, SUITE 800</rptOwnerStreet2>
            <rptOwnerCity>SANTA MONICA</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90401</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001409591</rptOwnerCik>
            <rptOwnerName>Clearlake Capital Partners, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O CLEARLAKE CAPITAL GROUP, L.P.</rptOwnerStreet1>
            <rptOwnerStreet2>233 WILSHIRE BLVD, SUITE 800</rptOwnerStreet2>
            <rptOwnerCity>SANTA MONICA</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90401</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001409590</rptOwnerCik>
            <rptOwnerName>CCG Operations, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O CLEARLAKE CAPITAL GROUP, L.P.</rptOwnerStreet1>
            <rptOwnerStreet2>233 WILSHIRE BLVD, SUITE 800</rptOwnerStreet2>
            <rptOwnerCity>SANTA MONICA</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90401</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2019-01-04</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>D</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>44390642</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>12.50</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Clearlake Capital Partners III (Master), L.P.</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Consists of shares of common stock disposed of pursuant to the agreement and plan of merger, dated November 6, 2018, among PVKG Investment Holdings, Inc. (&quot;Purchaser&quot;), PVKG Merger Sub, Inc., a wholly owned subsidiary of Purchaser, and ConvergeOne Holdings, Inc. in exchange for $12.50 per share.</footnote>
        <footnote id="F2">Consists of 44,390,642 shares of Common Stock held directly by Clearlake Capital Partners III (Master), L.P. Clearlake Capital Partners III GP, L.P. is the General Partner of Clearlake Capital Partners III (Master), L.P. Clearlake Capital Partners, LLC is the General Partner of Clearlake Capital Partners III GP, L.P. CCG Operations, LLC is the managing member of Clearlake Capital Partners, LLC. Each of Behdad Eghbali and Jose E. Feliciano are managers of CCG Operations, LLC and therefore share voting and investment power over the shares held by Clearlake Capital Partners III (Master), L.P.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Behdad Eghbali</signatureName>
        <signatureDate>2019-01-04</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Jose E. Feliciano</signatureName>
        <signatureDate>2019-01-04</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Clearlake Capital Partners III (Master), L.P., by Clearlake Capital Partners III GP, L.P., its general partner, /s/ Behdad Eghbali, its Co-President</signatureName>
        <signatureDate>2019-01-04</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Clearlake Capital Partners III GP, L.P., /s/ Behdad Eghbali, its Co-President</signatureName>
        <signatureDate>2019-01-04</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Clearlake Capital Partners, LLC, by /s/ Behdad Eghbali, its Managing Partner</signatureName>
        <signatureDate>2019-01-04</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>CCG Operations, LLC, by /s/ Behdad Eghbali, its Manager</signatureName>
        <signatureDate>2019-01-04</signatureDate>
    </ownerSignature>
</ownershipDocument>
