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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2018-06-29</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001701758</issuerCik>
        <issuerName>Lovesac Co</issuerName>
        <issuerTradingSymbol>LOVE</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001744516</rptOwnerCik>
            <rptOwnerName>Satori Capital, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2501 N. HARWOOD ST., 20TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>DALLAS</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>75201</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001744514</rptOwnerCik>
            <rptOwnerName>SCGPM, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2501 N. HARWOOD ST., 20TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>DALLAS</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>75201</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001744517</rptOwnerCik>
            <rptOwnerName>Satori Capital Strategic Opportunities GP, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2501 N. HARWOOD ST., 20TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>DALLAS</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>75201</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001744515</rptOwnerCik>
            <rptOwnerName>Satori Capital III GP, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2501 N. HARWOOD ST., 20TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>DALLAS</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>75201</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001501320</rptOwnerCik>
            <rptOwnerName>Satori Capital Strategic Opportunities, LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2501 N. HARWOOD STREET</rptOwnerStreet1>
            <rptOwnerStreet2>20TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>DALLAS</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>75201</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001679721</rptOwnerCik>
            <rptOwnerName>Satori Capital III, LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2501 N. HARWOOD STREET</rptOwnerStreet1>
            <rptOwnerStreet2>20TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>DALLAS</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>75201</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001106523</rptOwnerCik>
            <rptOwnerName>VANDERBECK SUNNY</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2501 N. HARWOOD ST., 20TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>DALLAS</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>75201</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001335485</rptOwnerCik>
            <rptOwnerName>Eisenman Randy</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2501 N. HARWOOD ST., 20TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>DALLAS</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>75201</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>2018-09-28</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>5000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1813041</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote 2</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Represents shares of Common Stock issued to the Reporting Person by the Issuer pursuant to an Amended Letter Agreement between the Reporting Person and the Issuer, dated June 22, 2018.</footnote>
        <footnote id="F2">Represents 1,262,783 shares of Common Stock owned by Satori Capital Strategic Oppotunities, LP (&quot;Satori CSO&quot;) and 550,258 shares of Common Stock owned by Satori Capital III, LP (&quot;SCIII&quot;). Satori Capital Strategic Opportunities GP, LLC (&quot;Satori CSOGP&quot;), is the general partner of Satori CSO and Satori Capital III GP, LLC (&quot;SCIIIGP&quot;), is the general partner of SCIII. SCGPM, LLC (&quot;SCGPM&quot;) is the manager of Satori CSOGP and SCIIIGP and may be deemed to share voting and dispositive power with respect to the shares held by Satori CSO and SCIII. SCGPM is wholly owned and controlled by Satori Capital, LLC (&quot;Satori Capital&quot;), which is indirectly owned and controlled by Sunny Vanderbeck and Randy Eisenman through entities that Sunny Vanderbeck or Randy Eisenman own or control.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Satori Capital, LLC; By /s/ Sunny Vanderbeck; Title: President</signatureName>
        <signatureDate>2018-10-01</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>SCGPM, LLC; By: /s/ Sunny Vanderbeck; Title: President</signatureName>
        <signatureDate>2018-10-01</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Satori Capital Strategic Opportunities GP, LLC; By: SCGPM, LLC, its Manager, By: /s/ Sunny Vanderbeck; Title: President</signatureName>
        <signatureDate>2018-10-01</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Satori Capital III GP, LLC; By: SCGPM, LLC, its Manager, By: /s/ Sunny Vanderbeck; Title: President</signatureName>
        <signatureDate>2018-10-01</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Satori Capital Strategic Opportunities, LP; By: Satori Capital Strategic Opportunities GP, LLC, its General Partner, By SCGPM, LLC, its Manager; By: /s/ Sunny Vanderbeck; Title: President</signatureName>
        <signatureDate>2018-10-01</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Satori Capital III, LP; By: Satori Capital III GP, LLC, its General Partner, By: SCGPM, LLC, its Manager; By: /s/ Sunny Vanderbeck; Title: President</signatureName>
        <signatureDate>2018-10-01</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Sunny Vanderbeck; By: /s/ Sunny Vanderbeck</signatureName>
        <signatureDate>2018-10-01</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Randy Eisenman; By: /s/ Randy Eisenman</signatureName>
        <signatureDate>2018-10-01</signatureDate>
    </ownerSignature>
</ownershipDocument>
