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

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2020-06-10</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001806201</issuerCik>
        <issuerName>Nebula Parent Corp.</issuerName>
        <issuerTradingSymbol>LPRO</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001814733</rptOwnerCik>
            <rptOwnerName>Bregal Sagemount I, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>SECOND FLOOR, WINDWARD HOUSE</rptOwnerStreet1>
            <rptOwnerStreet2>LA ROUTE DE LA LIBERATION</rptOwnerStreet2>
            <rptOwnerCity>ST. HELIER, JERSEY</rptOwnerCity>
            <rptOwnerState>Y9</rptOwnerState>
            <rptOwnerZipCode>JE2 3BQ</rptOwnerZipCode>
            <rptOwnerStateDescription>JERSEY</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001814601</rptOwnerCik>
            <rptOwnerName>Bregal North America General Partner Jersey Ltd</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>SECOND FLOOR, WINDWARD HOUSE</rptOwnerStreet1>
            <rptOwnerStreet2>LA ROUTE DE LA LIBERATION</rptOwnerStreet2>
            <rptOwnerCity>ST. HELIER, JERSEY</rptOwnerCity>
            <rptOwnerState>Y9</rptOwnerState>
            <rptOwnerZipCode>JE2 3BQ</rptOwnerZipCode>
            <rptOwnerStateDescription>JERSEY</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001814533</rptOwnerCik>
            <rptOwnerName>Bregal Investments, Inc.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>277 PARK AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2>29TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10172</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>14278604</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F1"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>26071</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Bregal Sagemount I, L.P. (&quot;Bregal Sagemount&quot;), is the record holder of the shares reported. Bregal North America General Partner Jersey Limited (the &quot;General Partner&quot;) is the General Partner of Bregal Sagemount.  Bregal Investments, Inc. (&quot;Bregal Investments&quot;) is the registered investment advisor of Bregal Sagemount. Each of the General Partner and Bregal Investments disclaims beneficial ownership of these shares except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that it is the beneficial owner of such shares for Section 16 of the Securities Exchange Act of 1934 or any other purposes. The business address of Bregal Sagemount I, L.P. and Bregal North America General Partner Jersey Limited is Second Floor, Windward House La Route de la Liberation St. Helier, JE2 3BQ Jersey, Channel Islands. The business address of Bregal Investments, Inc. is 277 Park Avenue, 29th Floor New York, NY 10172.</footnote>
        <footnote id="F2">The shares reported are held directly by Bregal Investments.  Each of Bregal Sagemount and the General Partner disclaims beneficial ownership of these shares except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that it is the beneficial owner of such shares for Section 16 of the Securities Exchange Act of 1934 or any other purposes.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Bregal Sagemount I, L.P., By: Bregal North America General Partner Jersey Limited: Its; General Partner, By: /s/ Colin James Dow, Name: Colin James Dow, Title: Director</signatureName>
        <signatureDate>2020-06-10</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Bregal Sagemount I, L.P., By: Bregal North America General Partner Jersey Limited: Its; General Partner, By: /s/ Paul Andrew Bradshaw, Name: Paul Andrew Bradshaw, Title: Director</signatureName>
        <signatureDate>2020-06-10</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Bregal North America General Partner Jersey Limited, By: /s/ Colin James Dow, Name: Colin James Dow, Title: Director</signatureName>
        <signatureDate>2020-06-10</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Bregal North America General Partner Jersey Limited, By: /s/ Paul Andrew Bradshaw, Name: Paul Andrew Bradshaw, Title: Director</signatureName>
        <signatureDate>2020-06-10</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Bregal Investments, Inc., By: /s/ Michelle S. Riley, Name: Michelle S. Riley, Title: Secretary</signatureName>
        <signatureDate>2020-06-10</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Bregal Investments, Inc., By: /s/ Ronald Fishman, Name: Ronald Fishman, Title: Treasurer</signatureName>
        <signatureDate>2020-06-10</signatureDate>
    </ownerSignature>
</ownershipDocument>
