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

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2025-06-18</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000712771</issuerCik>
        <issuerName>ConnectOne Bancorp, Inc.</issuerName>
        <issuerTradingSymbol>CNOB</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0002073821</rptOwnerCik>
            <rptOwnerName>Primiano Steven</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O CONNECTONE BANCORP, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>301 SYLVAN AVENUE</rptOwnerStreet2>
            <rptOwnerCity>ENGLEWOOD CLIFFS</rptOwnerCity>
            <rptOwnerState>NJ</rptOwnerState>
            <rptOwnerZipCode>07059</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>EVP,Treas.&amp; C Corp Develop. O.</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>16675</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Includes:  (a) 992 shares received pursuant to a March 20, 2023 grant of deferred stock units subject to forfeiture, which vests in full on 3/20/26; (b) 1,933 shares received pursuant to a March 22, 2024 grant of deferred stock units subject to forfeiture, of which 967 shares vest 3/22/26, and an additional 966 shares vest on 3/22/27; and (c) 3,192 shares received pursuant to a March 20, 2025 grant of deferred stock units subject to forfeiture, vesting over a three-year period, with 1/3 vesting on 3/20/26, 1/3 vesting on 3/20/27, and the final 1/3 vesting on 3/20/28.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Laura Criscione, POA</signatureName>
        <signatureDate>2025-06-18</signatureDate>
    </ownerSignature>
</ownershipDocument>
