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

    <schemaVersion>X0607</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2026-04-15</periodOfReport>

    <noSecuritiesOwned>1</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000931427</issuerCik>
        <issuerName>GAS TRANSPORTER OF THE SOUTH INC</issuerName>
        <issuerTradingSymbol>TGS</issuerTradingSymbol>
        <issuerForeignTradingSymbol>TGSU2</issuerForeignTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0002132130</rptOwnerCik>
            <rptOwnerName>Chighizola Diego Agustin</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerNonUSAddressFlag>true</rptOwnerNonUSAddressFlag>
            <rptOwnerStreet1>LEANDRO N. ALEM 882</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>CITY OF BUENOS AIRES</rptOwnerCity>
            <rptOwnerNonUSStateTerritory></rptOwnerNonUSStateTerritory>
            <rptOwnerCountry>C1</rptOwnerCountry>
            <rptOwnerZipCode>C1001AAQ</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>alternate director</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <ownerSignature>
        <signatureName>/s/Chighizola Diego Agustin</signatureName>
        <signatureDate>2026-04-28</signatureDate>
    </ownerSignature>
</ownershipDocument>