- Oman
- » GALFAR group of companies
- » Bahwan Engineering Company (BEC)
- » Al Hassan General Trading and Contracting
- » Special Technical Services (STS)
- » Al Khaleej Heavy Equipment
- » NCTC
- » Oman Industrial Coating Centre (OICC)
- » OMZEST Group of Companies
- » Caledonian College
- » Al Hashar Group of Companies
- » TOCO
- » Mott McDonald
- » Bechtel
- » Oman Shapoorji
- » Hassan Juma Backer
- » Petron
- » MAJES Tech
- » Vijay Tanks
- » Punj Lloyd
- » Al Athnain
- Kuwait
- » Instrumentation Installation and Maintenance Company (IMCO)
- » RATQA
- » Al Ghanim International
- » Continental Garments
- » Wood Group Engineering
- » Kellogg, Brown and Root (KBR)
- » KREMENCO
- United Arab Emirates
- » Dubai Aluminium (DUBAL)
- » Al Jaber Engineering Services
- » Al Futtaim Engineering
- » Betterhomes Engineering
- » Chicago Bridge & Iron (CBI)
- » Punj Llyods
- » Galfar Abu Dhabi
- » LINDENBERG
- » KENTECH
- » Centaur Electromechanical Company
- » ALSA Engineering (Al Sayegh Group)
- » Woodgroup Engineering Services
- » Convrgnt Value Engineering
- » Petrofac
- » Amplex Engineering
- » JP Kenny
- » Weatherford
- » Robust Contracting
- » Maritime Industrial Services (MIS)
- » Right Angle Media
- » Dodsal
- » American Bureau of Shipping
- » Technip
- » CH2M
- » Petron
- » Neel Kamal
- » EMAL
- » Lamprell
- » Arenco
- » Darwish Bin Ahmed
- Saudi Arabia
- » Kellogg, Brown and Root
- » Japan Gas Corporation
- » American Bureau of Shipping (ABS)
- Qatar
- » Intech Engineering
- » United Development Company (UDC)
- » Oryx Energy
- » QCON (Earlier MECON)
- » Momenta
- » Al Faisal Holdings
- » Petroserv
- » Consolidated Contractors (CCC)
- » Construction Development
- » Company (CDC)
- » Al Jaber
- » Inco
- » PE&S
- » Linde
- Bahrain
- » Aluminium Bharain (ALBA)
- » Mohsin Haji Ali
- » Ameeri Electrical Industries
- » Fakhro Group of Companies
- » BALEXCO
- » Al Aali Group of Companies