| Al Emadi Trading & Contracting Co. |
| Afrina Trading & Contstruction Company |
| AG Tech Co. W.L.L |
| Aktor Qatar W.L.L. |
| Al Afifi Engineering & Trading Co. W.L.L |
| Al Alia Trading & Contracting L.L.C |
| Al Anis Trading Co. W.L.L |
| Al Ayadi Electrical Supplies |
| Al Bader Construction & Steel Works W.L.L |
| Al Bader Group |
| Al Bandary Group |
| Al Jaber Electromechanical Co. |
| Al Jaber Trading & Contg. Cp. WLL |
| Al Khayyat Contracting & Trading |
| Al Maadeed Group |
| Al Malki Trading Company |
| Al Mamoon Oilfield & Industrial Supplies Co. |
| Al Mannai Trad. Cont. & Services |
| Al Muftah Contracting Co. W.L.L |
| Al Sabbah Trading & Contracting Company WLL |
| Al Seal Contracting & Trading Company W.L.L |
| Al Waha Contracting & Trading Co. W.L.L |
| ALCAT Contracting |
| Aljaber Engineering |
| Al-Sulaithi Ref. Air Conditioning & Trad. Est. |
| Amana Qatar Contracting Co. W.L.L |
| American International Contractors,Inc. |
| Apollo Fleet W.L.L |
| Arabian Airconditioning Contracting |
| Armstrong Power L.L.C |
| Badr Contracting & Trading W.L.L |
| Bin Omran Group |
| Bin Thani Electro Mechanical Cont. & Trading Co. W.L.L |
| Chapo Trading & Contracting- Qtar W.L.L |
| Construction Development Company W.L.L |
| Construction Dynamics LLC |
| Continental Cooling Co. (W.L.L) |
| Control Contracting & Trading Co. (Qatar) L.L.C |
| Crompton International Trading & Contracting Co. WLL |
| Darwish Contracting Co. W.L.L |
| Darwish Mechanical & Electrical Co. W.L.L |
| Darwish Trading Co. W.L.L |
| Doha Cables |
| Doha Oilfield Serviceswll |
| Doha Petroleum Construction Co. Ltd. |
| Electric Lightning Co. Qatar W.L.L |
| Emdad Petroleum Services (Qatar) |
| Energoporojekt Entel |
| Energy Technical Services |
| Equipment Trading & Contracting Co. W.L.L |
| Ezdan Holding Group |
| FJ Trading & Engineering Co. W.L.L |
| Futur Engineering Company W.L.L |
| Galfar Al Misnad Engineering & Contracting |
| Gastech Trading & Tech. Svcs. Co. |
| Gulf Contracting Co. W.L.L |
| Gulf Group Holding |
| Gulf Lights Electricals & Engineering |
| Hatco Trading & Contracting |
| Hawk Engineering WLL |
| HBK Contracting Co. |
| Imperial Trading & Contracting Company (ITCC) |
| Jassim Bin Khalid – BICC W.L.L |
| Jersey Engineering & Trading Co. |
| Joannou & Paraskevaides Qatar W.L.L |
| Khalid Electrical & Mechnical Establishment (KEMCO) |
| Kittco Group |
| Laffan Trading & Contracting W.L.L |
| Lahdan Refrigeration & Equipment Trading Qatar |
| Lumatron |
| Maersk Contractors Qatar WLL |
| Manco Interational General Contracting W.L.L |
| Mannai Trading Co. W.L.L |
| Marc Marine Air Conditioning & Refrigeration Co. |
| Medgulf Construction Co. W.L.L |
| Megarme Qatar LLC |
| Megatec Electro Mechanical Engineers & Contractors WLL |
| Midwill Trading Inc. Qatar |
| Mohammed Hussain Al-Muftah Est. |
| Nehmeh |
| Nu-Elec Enterprises Co. W.L.L |
| Obaikan Equipment & Services |
| Orient Star International |
| Panorama Contracting & Engineering Services W.L.L |
| PEMCO Inspection Co. |
| Peninsular Petrotech Engineering W.L.L |
| Penta Trading Group W.L.L |
| Petroserv |
| Popular Electricals & Trading Co. W.L.L |
| Professional Tools Trading Company |
| Promer Qatar Contracting Co. W.L.L |
| Qatar Electro Mechanical Group (QEMG) |
| Qatar Electromechanical Solutions |
| Qatar Engineering & Construction Company W.L.L (QCON) |
| Qatar International Trading Company W.L.L |
| Qatar Kentz W.L.L |
| Qatari Arabian Construction Co. W.L.L |
| Qatari Modern Maintenance Co. |
| Qatari Resource Trading & Contracting |
| Qpak Trading, Cont. & Services |
| RAMCO Trading & Constracting Co. W.L.L |
| REDCO Construction – Almana |
| Redco International |
| Refrigeration World W.L.L |
| Relained Gulf Trading & Trading Contracting Co. W.L.L |
| SATCO International |
| Sea Gulf Trading & Contracting WLL |
| Shaheen Electrical Works & Trading W.L.L |
| Specialized Oil Services W.L.L |
| Structurel Qatar W.L.L |
| Tadmur Trading W.L.L |
| Takyeef Electromechanical W.L.L. |
| Technical Supplies & Services Co Ltd |
| Terna Qatar LLC |
| Teyseer Airconditioning & Refrigeration Co. (WLL) |
| Teyseer Group |
| Tracer Qatar W.L.L |
| Trags Electrical Engineering and Air Conditioning Company W.L.L |
| Unigulf Central Airconditioning Contracting Co. |
| United Electronics Co. L.L.C |
| Universal Refrigeration & Air Conditioning |
| UrbaCon Trading & Contracting |
| Venture Gulf Group- Oil & Gas Division |
| Viva Air Conditioning W.L.L |