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

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2026-03-12</periodOfReport>

    <noSecuritiesOwned>1</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001179821</issuerCik>
        <issuerName>BIRKS GROUP INC.</issuerName>
        <issuerTradingSymbol>BGI</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0002116223</rptOwnerCik>
            <rptOwnerName>Battista Aldo Mr</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O BIRKS GROUP INC.</rptOwnerStreet1>
            <rptOwnerStreet2>200-2020 BLVD ROBERT-BOURASSA</rptOwnerStreet2>
            <rptOwnerCity>MONTREAL</rptOwnerCity>
            <rptOwnerState>A8</rptOwnerState>
            <rptOwnerZipCode>H3A 2A5</rptOwnerZipCode>
            <rptOwnerStateDescription>QUEBEC, CANADA</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>VP, Accounting and Treasury</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <remarks>NOTE: This is an initial Form 3 filing as an officer who does not hold any securities of a Foreign Private Issuer</remarks>

    <ownerSignature>
        <signatureName>Helene Delaney by power of attorney</signatureName>
        <signatureDate>2026-03-12</signatureDate>
    </ownerSignature>
</ownershipDocument>
