- ABB Contracting Ltd.
- AK Heavy Industries Ltd.
- Al-Mana Group
- AL-Mojil Group
- Al-Suwaidi Group
- Alstom Italia Ltd.
- Ansaldo Engineering Ltd.
- Arabia Metal Co. Ltd.
- Arabian Pipe Coating Co. Ltd.
- Astra Polymer Compounding Co. Ltd.
- Bechtel Arabia Ltd.
- Carlo Gavasi Engineering Co. Ltd.
- Consolidated Contracting Co. Ltd.
- Dar-Al Riyadh Ltd.
- Eastern Engineering Consulting Co. Ltd.
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- Energy & Power Co. Ltd.
- EPACS Arabia Ltd.
- EURO Tech. Ltd.
- Future Pipe Ind. LLC
- Gama Engineering Ltd.
- GAS Arabia Ltd.
- Gulf Engineering Co. Ltd.
- Halli Burton Arabia Ltd.
- Japan Gas Corporation
- Jubail United PetroChemical Co. Ltd.
- King Wilkinson Co. Ltd.
- KSB Fluid Systems
- National Contracting Company Ltd.
- National Engineering Group Intl. Ltd.
- National Steel Company Ltd.
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- National Tele. Comm. Co. Ltd.
- Nesma Al-Fadal Group
- Petrocon Ltd.
- PI Consult.
- Pool Arabia Ltd.
- Power Point Eight Ltd.
- Riyadh Geotech And Foundations Ltd.
- Saud Consult
- Saudi Engineering Group Intl.
- Saudi Pan Gulf Ltd.
- Saudi Technip Co. Ltd.
- Saudi Voest Alpine Ltd.
- Siemens Arabia Ltd.
- Snamprogetti Arabia Ltd.
- SNC Lavalin Arabia Ltd.
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