Petrochemical
- SABIC (Various affiliates of SABIC as Joint Ventures in the Industrial cities of Jubail & Yanbu)
- National Industrialization Co. (TASNEE)
- SADARA
Oil & Gas Refineries
- Saudi Aramco
- Saudi Aramco Mobil Refinery (SAMREF)
- Saudi Aramco Base Oil Company (Luberef)
- Rabigh Refining & Petrochemical Company (Petro Rabigh)
- Banagas, Bahrain
Desalination
- Various Desalination Plants of Saline water Conversion Corporation (SWCC).
- Rabigh Arabian Water & Electricity Company (RAWEC)
- First National Operation & Maintenance Company (NOMAC)
Petrochemical
- SABIC (Various affiliates of SABIC as Joint Ventures in the Industrial cities of Jubail & Yanbu)
- National Industrialization Co. (TASNEE)
- SADARA
Oil & Gas Refineries
- Saudi Aramco
- Saudi Aramco Mobil Refinery (SAMREF)
- Saudi Aramco Base Oil Company (Luberef)
- Rabigh Refining & Petrochemical Company (Petro Rabigh)
- Banagas, Bahrain
Desalination
- Various Desalination Plants of Saline water Conversion Corporation (SWCC).
- Rabigh Arabian Water & Electricity Company (RAWEC)
- First National Operation & Maintenance Company (NOMAC)
