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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2020-03-26</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001377630</issuerCik>
        <issuerName>National CineMedia, Inc.</issuerName>
        <issuerTradingSymbol>NCMI</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001168696</rptOwnerCik>
            <rptOwnerName>REGAL ENTERTAINMENT GROUP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>101 EAST BLOUNT AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>KNOXVILLE</rptOwnerCity>
            <rptOwnerState>TN</rptOwnerState>
            <rptOwnerZipCode>37920</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001389064</rptOwnerCik>
            <rptOwnerName>Regal CineMedia CORP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>101 EAST BLOUNT AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>KNOXVILLE</rptOwnerCity>
            <rptOwnerState>TN</rptOwnerState>
            <rptOwnerZipCode>37920</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000905035</rptOwnerCik>
            <rptOwnerName>REGAL CINEMAS INC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>101 EAST BLOUNT AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>KNOXVILLE</rptOwnerCity>
            <rptOwnerState>TN</rptOwnerState>
            <rptOwnerZipCode>37920</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001725060</rptOwnerCik>
            <rptOwnerName>Cineworld Group plc</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>101 EAST BLOUNT AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>KNOXVILLE</rptOwnerCity>
            <rptOwnerState>TN</rptOwnerState>
            <rptOwnerZipCode>37920</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Common Units of National CineMedia, LLC</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2020-03-26</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>520025</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock of National CineMedia, Inc.</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>520025</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>42290694</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Reporting Entities</value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Common Units of National CineMedia, LLC (&quot;Common Units&quot;) may be converted at any time into shares of Common Stock of National CineMedia, Inc. on a one-for-one basis, and have no expiration.</footnote>
        <footnote id="F2">The reported securities are owned directly by Regal Cinemas, Inc. and Regal CineMedia Holdings, LLC and indirectly by Regal CineMedia Corporation, Regal Cinemas Corporation, Regal Entertainment Holdings, Inc., Regal Entertainment Group, Crown Intermediate Holdco, Inc., Crown UK Holdco Limited and Cineworld Group plc.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>REGAL ENTERTAINMENT GROUP By: Name: Vincent Fusco Title: Senior Vice President, Chief Financial Officer and Treasurer</signatureName>
        <signatureDate>2020-03-30</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>REGAL CINEMEDIA HOLDINGS, LLC By: Name: Vincent Fusco Title: Senior Vice President, Chief Financial Officer and Treasurer</signatureName>
        <signatureDate>2020-03-30</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>REGAL CINEMEDIA CORPORATION By: Name: Vincent Fusco Title: Senior Vice President, Chief Financial Officer and Treasurer</signatureName>
        <signatureDate>2020-03-30</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>REGAL CINEMAS, INC. By: Name: Vincent Fusco Title: President, Chief Financial Officer and Treasurer</signatureName>
        <signatureDate>2020-03-30</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>REGAL CINEMAS CORPORATION By: Name: Vincent Fusco Title: Senior Vice President, Chief Financial Officer and Treasurer</signatureName>
        <signatureDate>2020-03-30</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>REGAL ENTERTAINMENT HOLDINGS, INC. By: Name: Vincent Fusco Title: Senior Vice President, Chief Financial Officer and Treasurer</signatureName>
        <signatureDate>2020-03-30</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>CROWN INTERMEDIATE HOLDCO, INC. By: Name: Nisan Cohen Title: Board Director</signatureName>
        <signatureDate>2020-03-30</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>CROWN UK HOLDCO LIMITED By: Name: Nisan Cohen Title: Board Director</signatureName>
        <signatureDate>2020-03-30</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>CINEWORLD GROUP PLC By: Name: Nisan Cohen Title: Board Director &amp; Chief Financial Officer</signatureName>
        <signatureDate>2020-03-30</signatureDate>
    </ownerSignature>
</ownershipDocument>
