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

    <schemaVersion>X0607</schemaVersion>

    <documentType>3</documentType>

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

    <noSecuritiesOwned>1</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001122411</issuerCik>
        <issuerName>ASE Technology Holding Co., Ltd.</issuerName>
        <issuerTradingSymbol>ASX</issuerTradingSymbol>
        <issuerForeignTradingSymbol></issuerForeignTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0002111672</rptOwnerCik>
            <rptOwnerName>Liu Kelvin Fook Lin</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerNonUSAddressFlag>true</rptOwnerNonUSAddressFlag>
            <rptOwnerStreet1>PLOT 20, HILIR SUNGAI KELUANG 2</rptOwnerStreet1>
            <rptOwnerStreet2>PHASE 4 BAYAN LEPAS FREE INDUSTRIAL ZONE</rptOwnerStreet2>
            <rptOwnerCity>PENANG</rptOwnerCity>
            <rptOwnerNonUSStateTerritory></rptOwnerNonUSStateTerritory>
            <rptOwnerCountry>N8</rptOwnerCountry>
            <rptOwnerZipCode>11900</rptOwnerZipCode>
            <rptOwnerStateDescription>MALAYSIA</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>GM, ASE Malaysia</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <remarks>Exhibit List - Exhibit 24.1 - Power of Attorney</remarks>

    <ownerSignature>
        <signatureName>/s/ Georgette Yeh, attorney-in-fact for Kelvin Fook Lin Liu</signatureName>
        <signatureDate>2026-03-18</signatureDate>
    </ownerSignature>
</ownershipDocument>