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

    <schemaVersion>X0607</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2026-03-18</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001969863</issuerCik>
        <issuerName>SU Group Holdings Ltd</issuerName>
        <issuerTradingSymbol>SUGP</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0002036583</rptOwnerCik>
            <rptOwnerName>KONG WING FAI</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerNonUSAddressFlag>true</rptOwnerNonUSAddressFlag>
            <rptOwnerStreet1>12A, 16/F, NASSAU STREET</rptOwnerStreet1>
            <rptOwnerStreet2>MEI FOO SUN CHUEN</rptOwnerStreet2>
            <rptOwnerCity>KOWLOON</rptOwnerCity>
            <rptOwnerNonUSStateTerritory></rptOwnerNonUSStateTerritory>
            <rptOwnerCountry>K3</rptOwnerCountry>
            <rptOwnerZipCode></rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Financial Officer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Class A Ordinary Shares</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>8000</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Represents 8,000 Restricted Shares granted to the Reporting Person on December 9, 2024 under the Issuers 2024 Equity Incentive Plan, as amended. The Restricted Shares are subject to the following vesting schedule, contingent upon continued service of the Reporting Person at the time of vesting or as otherwise provided for in the applicable award agreement: (i) 4,000 Restricted Shares vest on such date after the completion of the Issuers Secondary Offering as determined by the Issuers Board of Directors and (ii) 4,000 Restricted Shares will vest on December 9, 2026.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Kong Wing Fai</signatureName>
        <signatureDate>2026-03-18</signatureDate>
    </ownerSignature>
</ownershipDocument>
