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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2020-12-04</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001793229</issuerCik>
        <issuerName>MultiPlan Corp</issuerName>
        <issuerTradingSymbol>MPLN</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001767563</rptOwnerCik>
            <rptOwnerName>H&amp;F Corporate Investors VIII, Ltd.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>415 MISSION STREET, SUITE 5700</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SAN FRANCISCO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94105</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001801252</rptOwnerCik>
            <rptOwnerName>Hellman &amp; Friedman Investors VIII, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>415 MISSION STREET, SUITE 5700</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SAN FRANCISCO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94105</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001618909</rptOwnerCik>
            <rptOwnerName>HFCP VIII (Parallel - A), L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>415 MISSION STREET, SUITE 5700</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SAN FRANCISCO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94105</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001834598</rptOwnerCik>
            <rptOwnerName>Music Investments, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>415 MISSION STREET, SUITE 5700</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SAN FRANCISCO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94105</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001834610</rptOwnerCik>
            <rptOwnerName>Music Investments GP, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>415 MISSION STREET, SUITE 5700</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SAN FRANCISCO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94105</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001405076</rptOwnerCik>
            <rptOwnerName>Thorpe Allen R</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>415 MISSION STREET, SUITE 5700</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SAN FRANCISCO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94105</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A common stock</value>
            </securityTitle>
            <transactionDate>
                <value>2020-12-04</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>114721</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>7.5363</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>114721</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F3"/>
                    <footnoteId id="F10"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A common stock</value>
            </securityTitle>
            <transactionDate>
                <value>2020-12-07</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>1597324</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>8.3446</value>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1712045</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F3"/>
                    <footnoteId id="F10"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Class A common stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>112593413</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F4"/>
                    <footnoteId id="F10"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Class A common stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>50532114</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F5"/>
                    <footnoteId id="F10"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Class A common stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>9549505</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F6"/>
                    <footnoteId id="F10"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Class A common stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2953631</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F7"/>
                    <footnoteId id="F10"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Class A common stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>496709</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F8"/>
                    <footnoteId id="F10"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Class A common stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>37677074</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F9"/>
                    <footnoteId id="F10"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Represents shares of Class A common stock purchased in multiple transactions at prices ranging from $7.465 to $7.70. The price reported is a weighted average price. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the Staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of Class A common stock purchased at each separate price within the range set forth in this footnote (1).</footnote>
        <footnote id="F2">Represents shares of Class A common stock purchased in multiple transactions at prices ranging from $8.12 to $8.66. The price reported is a weighted average price. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the Staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of Class A common stock purchased at each separate price within the range set forth in this footnote (2).</footnote>
        <footnote id="F3">Reflects securities directly held by Music Investments, L.P., the general partner of which is Music Investments GP, LLC, the managing member of which is HFCP VIII (Parallel-A), L.P. (&quot;HFCP VIII Parallel-A&quot;).</footnote>
        <footnote id="F4">Reflects securities directly held by Hellman &amp; Friedman Capital Partners VIII, L.P. (&quot;HFCP VIII&quot;).</footnote>
        <footnote id="F5">Reflects securities directly held by Hellman &amp; Friedman Capital Partners VIII (Parallel), L.P. (&quot;HFCP VIII Parallel&quot;).</footnote>
        <footnote id="F6">Reflects securities directly held by HFCP VIII Parallel-A.</footnote>
        <footnote id="F7">Reflects securities directly held by H&amp;F Executives VIII, L.P. (&quot;H&amp;F VIII Executives&quot;).</footnote>
        <footnote id="F8">Reflects securities directly held by H&amp;F Associates VIII, L.P. (&quot;H&amp;F VIII Associates&quot;, and together with HFCP VIII, HFCP VIII Parallel, HFCP VIII Parallel-A and H&amp;F VIII Executives, the &quot;H&amp;F VIII Funds&quot;).</footnote>
        <footnote id="F9">Reflects securities directly held by H&amp;F Polaris Partners, L.P. (&quot;Polaris Partners&quot;), the general partner of which is H&amp;F Polaris Partners GP, LLC, the managing member of which is HFCP VIII.</footnote>
        <footnote id="F10">Hellman &amp; Friedman Investors VIII, L.P. (&quot;H&amp;F Investors VIII&quot;) is the general partner of each of the H&amp;F VIII Funds. H&amp;F Corporate Investors VIII, Ltd. (&quot;H&amp;F VIII&quot;) is the general partner of H&amp;F Investors VIII. A three member board of directors of H&amp;F VIII has investment discretion over the shares held by the H&amp;F VIII Funds and Polaris Partners. Allen R. Thorpe, a member of the board of directors of MultiPlan Corporation is a member of the board of directors of H&amp;F VIII.</footnote>
    </footnotes>

    <remarks>The Reporting Persons states that this filing shall not be an admission that the Reporting Persons are the beneficial owners of any of the securities reported herein, and each Reporting Person disclaims beneficial ownership of such securities except to the extent of such Reporting Person's pecuniary interest therein.</remarks>

    <ownerSignature>
        <signatureName>H&amp;F CORPORATE INVESTORS VIII, LTD. By: /s/ Allen Thorpe Name: Allen Thorpe Title: Vice President</signatureName>
        <signatureDate>2020-12-08</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>HELLMAN &amp; FRIEDMAN INVESTORS VIII, L.P. By: H&amp;F Corporate Investors VIII, Ltd., as general partner By: /s/ Allen Thorpe Name: Allen Thorpe Title: Vice President</signatureName>
        <signatureDate>2020-12-08</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>HFCP VIII (PARALLEL-A), L.P. By: Hellman &amp; Friedman Investors VIII, L.P., as general partner By: H&amp;F Corporate Investors VIII, Ltd., as general partner By: /s/ Allen Thorpe Name: Allen Thorpe Title: Vice President</signatureName>
        <signatureDate>2020-12-08</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>MUSIC INVESTMENTS GP, LLC. By: /s/ Allen Thorpe Name: Allen Thorpe Title: Vice President</signatureName>
        <signatureDate>2020-12-08</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>MUSIC INVESTMENTS, L.P. By: Music Investments GP, LLC., as general partner By: /s/ Allen Thorpe Name: Allen Thorpe Title: Vice President</signatureName>
        <signatureDate>2020-12-08</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>ALLEN R. THORPE: /s/ Allen R. Thorpe</signatureName>
        <signatureDate>2020-12-08</signatureDate>
    </ownerSignature>
</ownershipDocument>
