<?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>0001548624</rptOwnerCik>
            <rptOwnerName>Carlyle Group Management L.L.C.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O THE CARLYLE GROUP,</rptOwnerStreet1>
            <rptOwnerStreet2>1001 PENNSYLVANIA AVE., N.W. SUITE 220 S</rptOwnerStreet2>
            <rptOwnerCity>WASHINGTON</rptOwnerCity>
            <rptOwnerState>DC</rptOwnerState>
            <rptOwnerZipCode>20004-2505</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001527166</rptOwnerCik>
            <rptOwnerName>Carlyle Group L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O THE CARLYLE GROUP,</rptOwnerStreet1>
            <rptOwnerStreet2>1001 PENNSYLVANIA AVE., N.W. SUITE 220 S</rptOwnerStreet2>
            <rptOwnerCity>WASHINGTON</rptOwnerCity>
            <rptOwnerState>DC</rptOwnerState>
            <rptOwnerZipCode>20004-2505</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001548626</rptOwnerCik>
            <rptOwnerName>Carlyle Holdings I GP Inc.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O THE CARLYLE GROUP,</rptOwnerStreet1>
            <rptOwnerStreet2>1001 PENNSYLVANIA AVE., N.W. SUITE 220 S</rptOwnerStreet2>
            <rptOwnerCity>WASHINGTON</rptOwnerCity>
            <rptOwnerState>DC</rptOwnerState>
            <rptOwnerZipCode>20004-2505</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001548627</rptOwnerCik>
            <rptOwnerName>Carlyle Holdings I GP Sub L.L.C.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O THE CARLYLE GROUP,</rptOwnerStreet1>
            <rptOwnerStreet2>1001 PENNSYLVANIA AVE., N.W. SUITE 220 S</rptOwnerStreet2>
            <rptOwnerCity>WASHINGTON</rptOwnerCity>
            <rptOwnerState>DC</rptOwnerState>
            <rptOwnerZipCode>20004-2505</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001548628</rptOwnerCik>
            <rptOwnerName>Carlyle Holdings I L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O THE CARLYLE GROUP,</rptOwnerStreet1>
            <rptOwnerStreet2>1001 PENNSYLVANIA AVE., N.W. SUITE 220 S</rptOwnerStreet2>
            <rptOwnerCity>WASHINGTON</rptOwnerCity>
            <rptOwnerState>DC</rptOwnerState>
            <rptOwnerZipCode>20004-2505</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000933790</rptOwnerCik>
            <rptOwnerName>TC Group, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O THE CARLYLE GROUP</rptOwnerStreet1>
            <rptOwnerStreet2>1001 PENNSYLVANIA AVE., N.W. SUITE 220 S</rptOwnerStreet2>
            <rptOwnerCity>WASHINGTON</rptOwnerCity>
            <rptOwnerState>DC</rptOwnerState>
            <rptOwnerZipCode>20004-2505</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001548639</rptOwnerCik>
            <rptOwnerName>TC Group Sub L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O THE CARLYLE GROUP,</rptOwnerStreet1>
            <rptOwnerStreet2>1001 PENNSYLVANIA AVE., N.W. SUITE 220 S</rptOwnerStreet2>
            <rptOwnerCity>WASHINGTON</rptOwnerCity>
            <rptOwnerState>DC</rptOwnerState>
            <rptOwnerZipCode>20004-2505</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 CEOF II DE GP AIV, L.L.C., CEOF II DE AIV GP, L.P., CEOF II DE I AIV, L.P., CEOF II Coinvestment (DE), L.P. and CEOF II Coinvestment B (DE), L.P. are filing a separate Form 4.

Exhibit 24 - Power of Attorney.</remarks>

    <ownerSignature>
        <signatureName>Carlyle Group Management L.L.C. By: /s/ Anne Frederick, attorney-in-fact for Curtis L. Buser, Chief Financial Officer</signatureName>
        <signatureDate>2019-12-30</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>The Carlyle Group L.P. By: Carlyle Group Management L.L.C., its general partner By: /s/ Anne Frederick, attorney-in-fact for Curtis L. Buser, Chief Financial Officer</signatureName>
        <signatureDate>2019-12-30</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Carlyle Holdings I GP Inc. By: /s/ Anne Frederick, attorney-in-fact for Curtis L. Buser, Chief Financial Officer</signatureName>
        <signatureDate>2019-12-30</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Carlyle Holdings I GP Sub L.L.C. By: Carlyle Holdings I GP Inc., its sole member By: /s/ Anne Frederick, attorney-in-fact for Curtis L. Buser, Chief Financial Officer</signatureName>
        <signatureDate>2019-12-30</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Carlyle Holdings I L.P. By: /s/ Anne Frederick, attorney-in-fact for Curtis L. Buser, Chief Financial Officer</signatureName>
        <signatureDate>2019-12-30</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>TC Group, L.L.C. By: Carlyle Holdings I L.P., its sole member By: /s/ Anne Frederick, attorney-in-fact for Curtis L. Buser, Chief Financial Officer</signatureName>
        <signatureDate>2019-12-30</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>TC Group Sub L.P. By: TC Group, L.L.C., its general partner By: Carlyle Holdings I L.P., its sole member By: /s/ Anne Frederick, attorney-in-fact for Curtis L. Buser, Chief Financial Officer</signatureName>
        <signatureDate>2019-12-30</signatureDate>
    </ownerSignature>
</ownershipDocument>
