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

    <schemaVersion>X0609</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2026-11-02</periodOfReport>

    <dateOfOriginalSubmission>2026-11-05</dateOfOriginalSubmission>

    <issuer>
        <issuerCik>0001228454</issuerCik>
        <issuerName>BCB BANCORP INC</issuerName>
        <issuerTradingSymbol>BCBP</issuerTradingSymbol>
        <issuerForeignTradingSymbol></issuerForeignTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001826510</rptOwnerCik>
            <rptOwnerName>Gallotta Steven E.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerNonUSAddressFlag>false</rptOwnerNonUSAddressFlag>
            <rptOwnerStreet1>C/O BCB BANCORP, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>104-110 AVENUE C</rptOwnerStreet2>
            <rptOwnerCity>BAYONNE</rptOwnerCity>
            <rptOwnerState>NJ</rptOwnerState>
            <rptOwnerZipCode>07002</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>true</isDirector>
            <isOfficer>false</isOfficer>
            <isTenPercentOwner>false</isTenPercentOwner>
            <isOther>false</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>false</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2026-11-02</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>5</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>false</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <footnoteId id="F1"/>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>55</value>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>9.1299</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1514</value>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">This Amendment is filed to add code &quot;V&quot; to indicate that the transaction, which is eligible for deferred reporting on Form 5 under Section 240.16a-6, is voluntarily reported.</footnote>
        <footnote id="F2">Represents shares of common stock purchased in the open market through a broker on November 2, 2026 to satisfy the minimum director share ownership requirement under New Jersey Banking Law (N.J.S.A. 17:9A-103).</footnote>
        <footnote id="F3">Includes 1,459 shares of restricted stock awarded on October 28, 2026, previously reported on Form 4 on October 30, 2026.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Steven E. Gallotta by Patricia M. Schaubeck, attorney-in-fact</signatureName>
        <signatureDate>2026-11-05</signatureDate>
    </ownerSignature>
</ownershipDocument>
