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

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2024-09-18</periodOfReport>

    <noSecuritiesOwned>1</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001602658</issuerCik>
        <issuerName>Investar Holding Corp</issuerName>
        <issuerTradingSymbol>ISTR</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001543701</rptOwnerCik>
            <rptOwnerName>Ginn Scott G</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O INVESTAR HOLDING CORPORATION</rptOwnerStreet1>
            <rptOwnerStreet2>10500 COURSEY BLVD.</rptOwnerStreet2>
            <rptOwnerCity>BATON ROUGE</rptOwnerCity>
            <rptOwnerState>LA</rptOwnerState>
            <rptOwnerZipCode>70816</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
        </reportingOwnerRelationship>
    </reportingOwner>

    <remarks>No securities are beneficially owned.</remarks>

    <ownerSignature>
        <signatureName>/s/ Scott G. Ginn</signatureName>
        <signatureDate>2024-09-27</signatureDate>
    </ownerSignature>
</ownershipDocument>
