Qatar Petroleum Development Company. Ltd. (Japan) (QPD)

  RasGas Company

  QatarGas

  Maersk Oil Qatar

  Qatar Shell GTL Limited

  Qatar Fuel Additives Company Ltd (QAFAC).

  Mermaid Subsea Services

  Schlumberger Overseas S.A.

  Iberdrola

  Simedarby Engineering

  McDermott International

  Keppel Seghers Engineering 

  Qatar Engineering & Constuction Company W.L.L (Q-con)

  Descon Engineering 

  Al-Muftah Engineering

  Trans Worley Trags (TWT)

  Black Cat Engineering & Construction W.L.L

  Chicago Bridge & Iron (C.B.I)

  Topaz Engineering

  Hyundai Engineering

  Q Kentz W.L.L

  Gulf Piping Co. (UAE)

  C.T.C.I Overseas Corporation. Ltd

  Halul Offshore Company (HOSC)

  Stanford Marine

  Topaz Marine

  Bourbon Gulf W.L.L

  OMNI Group SDN BHD

  Miclyn Express Offshore Group

  Qatar Navigation ( Q.S.C)

  Anabeeb Services Ltd. W.L.L

  Contract Resourses

  Al Ghaith Trading and Industrial Services

  Qatar Fuel ( WoQod)

  Veolia Water 

  Work Boat International

  Trags Trading and Contracting

  WCT Berhad

  Chiyoda Almana Engineering