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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2018-08-20</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0001094348</issuerCik>
        <issuerName>Mattersight Corp</issuerName>
        <issuerTradingSymbol>MATR</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001232211</rptOwnerCik>
            <rptOwnerName>MURRAY MICHAEL JOHN</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>200 W. MADISON, SUITE 3100</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>CHICAGO</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60606</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
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            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

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                <value>Stock Option (right to buy)</value>
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                <transactionAcquiredDisposedCode>
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                <directOrIndirectOwnership>
                    <value>D</value>
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        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Series B Preferred Stock</value>
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            <transactionDate>
                <value>2018-08-20</value>
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                <value></value>
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                <transactionShares>
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                    <footnoteId id="F4"/>
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                    <footnoteId id="F4"/>
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    </derivativeTable>

    <footnotes>
        <footnote id="F1">Per the terms of the Agreement and Plan of Merger, dated 4/25/18, among the Issuer, NICE Systems, Inc., NICE Acquisition Sub, Inc., and NICE Ltd. (the &quot;Agreement&quot;) and the Offer (as defined in the Agreement), each share of the Issuer's common stock was tendered for $2.70 per share in cash, without interest and less any required withholding taxes.</footnote>
        <footnote id="F2">Disposed of per Section 2.7(e) of the Agreement, whereby each option with an exercise price greater than $2.70 per share that was outstanding immediately prior to the Offer Closing (as defined in the Agreement) was cancelled without consideration.</footnote>
        <footnote id="F3">Disposed of per Section 2.7(e) of the Agreement, whereby each option with an exercise price less than $2.70 per share that was outstanding immediately prior to the Offering Closing was cancelled for an amount per share of $2.70 less the applicable exercise price of the option.</footnote>
        <footnote id="F4">Per the terms of the Agreement and the Offer, each share of the Issuer's Series B Preferred Stock was tendered for $7.80 per share, plus accrued and unpaid dividends payable thereon, in cash, without interest and less any required withholding taxes.</footnote>
        <footnote id="F5">Immediate</footnote>
        <footnote id="F6">None</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Corrine N. Taylor, Attorney-in-fact</signatureName>
        <signatureDate>2018-08-20</signatureDate>
    </ownerSignature>
</ownershipDocument>
