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

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2019-12-19</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001752474</issuerCik>
        <issuerName>KLDiscovery Inc.</issuerName>
        <issuerTradingSymbol>KLD</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001789176</rptOwnerCik>
            <rptOwnerName>CEOF II DE I AIV, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O THE CARLYLE GROUP, 1001</rptOwnerStreet1>
            <rptOwnerStreet2>PENNSYLVANIA AVE. NW, SUITE 220S</rptOwnerStreet2>
            <rptOwnerCity>WASHINGTON</rptOwnerCity>
            <rptOwnerState>DC</rptOwnerState>
            <rptOwnerZipCode>20004</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001789158</rptOwnerCik>
            <rptOwnerName>CEOF II Coinvestment (DE), L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O THE CARLYLE GROUP, 1001</rptOwnerStreet1>
            <rptOwnerStreet2>PENNSYLVANIA AVE. NW, SUITE 220S</rptOwnerStreet2>
            <rptOwnerCity>WASHINGTON</rptOwnerCity>
            <rptOwnerState>DC</rptOwnerState>
            <rptOwnerZipCode>20004</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001789184</rptOwnerCik>
            <rptOwnerName>CEOF II Coinvestment B (DE), L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O THE CARLYLE GROUP, 1001</rptOwnerStreet1>
            <rptOwnerStreet2>PENNSYLVANIA AVE. NW, SUITE 220S</rptOwnerStreet2>
            <rptOwnerCity>WASHINGTON</rptOwnerCity>
            <rptOwnerState>DC</rptOwnerState>
            <rptOwnerZipCode>20004</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>19996804</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnotes</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Contingent Shares</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F4"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F4"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F4"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>1264166</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnotes</value>
                    <footnoteId id="F3"/>
                    <footnoteId id="F5"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Pursuant to the consummation of the business combination of Pivotal Acquisition Corp. and LD Topco, Inc., each share of the Company common stock was automatically converted into the right to receive a pro rata portion of Pivotal's Class A common stock (the &quot;Common Stock&quot;).</footnote>
        <footnote id="F2">Includes 18,261,123 shares held of record by CEOF II DE I AIV, L.P. (&quot;CEOF II DE&quot;), 1,658,789 shares held of record by CEOF II Coinvestment (DE), L.P. (&quot;CEOF II Coinvestment&quot;) and 76,892 shares held of record by CEOF II Coinvestment B (DE), L.P. (&quot;CEOF II Coinvestment B,&quot; and together with CEOF II DE and CEOF II Coinvestment, the &quot;CEOF Funds&quot;).</footnote>
        <footnote id="F3">Carlyle Group Management L.L.C. is the general partner of The Carlyle Group, L.P., which is a publicly traded entity listed on NASDAQ. The Carlyle Group, L.P. is the sole shareholder of Carlyle Holdings I GP Inc., which is the sole member of Carlyle Holdings I GP Sub L.L.C., which is the general partner of Carlyle Holdings I L.P., which is the sole member of TC Group, L.L.C., which is the general partner of TC Group Sub L.P., which is the sole member of CEOF II DE GP AIV, L.L.C., which is the general partner CEOF II DE AIV GP, L.P., which is the general partner of each of the CEOF Funds. Accordingly, each of the foregoing entities may be deemed to share beneficial ownership of the securities held of record by the CEOF Funds.</footnote>
        <footnote id="F4">Represents shares that may be issued to the Reporting Person if the closing sale price of Common Stock equals or exceeds $13.50 per share (as adjusted for stock splits, stock dividends, reorganizations, recapitalizations or other similar actions) for any consecutive 20 trading days during the five year period following December 19, 2019.</footnote>
        <footnote id="F5">Includes 1,154,439 shares held of record by CEOF II DE, 104,866 shares held of record by CEOF II Coinvestment and 4,861 shares held of record by CEOF II Coinvestment B.</footnote>
    </footnotes>

    <remarks>Due to the limitations of the electronic filing system Carlyle Group Management L.L.C., The Carlyle Group, L.P., Carlyle Holdings I GP Inc., Carlyle Holdings I GP Sub L.L.C., Carlyle Holdings I L.P., TC Group, L.L.C., TC Group Sub L.P. are filing a separate Form 4.

Exhibit 24 - Power of Attorney.</remarks>

    <ownerSignature>
        <signatureName>CEOF II DE GP AIV, L.L.C. By: /s/ William Darman, Authorized Person</signatureName>
        <signatureDate>2019-12-30</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>CEOF II DE AIV GP, L.P. By: CEOF II DE GP AIV, L.L.C., its general partner By: /s/ William Darman, Authorized Person</signatureName>
        <signatureDate>2019-12-30</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>CEOF II DE I AIV, L.P. By: CEOF II DE AIV GP, L.P., its general partner By: CEOF II DE GP AIV, L.L.C., its general partner By: /s/ William Darman, Authorized Person</signatureName>
        <signatureDate>2019-12-30</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>CEOF II Coinvestment (DE), L.P. By: CEOF II DE AIV GP, L.P., its general partner By: CEOF II DE GP AIV, L.L.C., its general partner By: /s/ William Darman, Authorized
Person</signatureName>
        <signatureDate>2019-12-30</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>CEOF II Coinvestment B (DE), L.P. By: CEOF II DE AIV GP, L.P., its general partner By: CEOF II DE GP AIV, L.L.C., its general partner By: /s/ William Darman,
Authorized Person</signatureName>
        <signatureDate>2019-12-30</signatureDate>
    </ownerSignature>
</ownershipDocument>
