| Builtech Engineering & Contracting Company | Construction |
| Bullseye Zoujaj L.L.C | Industrial Manufacturing |
| Business Communication Trading & Contracting | Industrial Manufacturing |
| Business Trading Company | Real Estate |
| Business Zone | Conglomerates |
| Buyer Solutions Trading & Contracting Company WLL | Construction |
| Buzwair Group W.L.L | Construction |
| Buzwair Industrial Gases Factories | Industrial Manufacturing |
| Buzwair Marble and Granite | Industrial Manufacturing |
| Cabaco Trading & Contracting | Conglomerates |
| CABz Transport | Transport |
| Caliber Trading Agencies & Franchising | Conglomerates |
| Caliber Trading Agencies & Franchising LLC | Real Estate |
| Candela Lighting | Retail |
| Capital Insurance Brokers L.L.C. | Financial Services |
| CARDIFF LOGISTICS WLL | Transport |
| Care Well International Trading | Information Technology |
| Carillion (Qatar) L.L.C | Construction |
| Carnegie Mellon University Qatar | Education |
| Casadel Gelato | Food and Beverages |
| CASTELLO - Cast Aluminium Company-Qatar | Industrial Manufacturing |
| Castle Constructions WLL | Construction |
| Castle for Building Materials Company | Industrial Manufacturing |
| Cedars Motors & Trading Co WLL | Conglomerates |
| Celerity Shipping & Forwarding Co WLL | Transport |
