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- Petroleum Development Oman (PDO)
- Sohar Aluminum Company
- Oman Refineries & Petrochemical Company (ORPIC)
- Daleel Petroleum Company
- Occidental of Oman - Mukhaizna
- Occidental of Oman - Shafah
- Al Ghubra Power and Desalination Company SAOC
- Oman India Fertilizer Co SAOG (OMIFCO)
- Petrogas - Rima
- Petrogas - Sahmah
- Petrofac (E&C)
- Vale Oman Pelletizing Company LLC
- JINDAL SHADEED – Iron & Steel Co.,
- The Oman Construction Company (TOCO)
- L &T Electromech LLC
- Attila Dogan Construction Installation INC CO., (AD)
- Woo group CCC (WGCCC)
- Special Technical Services (STS)
- Al Hassan Engineering Co.
- Galfar engineering & Contracting Co.(GALFAR)
- Special Oil Field Services (SOS)
- Gulf Petrochemical services (GPS)
- Fahud Oil Field Services (FOS)
- Dodsal Engineering and Construction (DODSAL)
- MB Petroleum
- Oil-tanking ODFJELL
- Bahwan Engineering Company
- AL HASSAN ENGINEERING CO.S.A.O.G
- Arabian Industries
- CC Energy
- Alba Power (UK)
