| Silver Falcon Contracting & Trading Company W.L.L. | Construction |
| Silverhawk TMA International | Services |
| Simplex Infrastructures Limited - Qatar | Construction |
| Sine Wave Electromechanical Works LLC | Construction |
| Sinmar Marble and Granite | Mining and Metals |
| Sinta Trading & Contracting W.L.L | Conglomerates |
| Sitaf Qatar W.L.L | Telecommunications |
| Site Technology Qatar | Conglomerates |
| Sixty Degrees | Services |
| Sketch Consulting Engineering | Construction |
| SMEC International Pty Ltd | Services |
| SMEET W.L.L. | Industrial Manufacturing |
| Smile Hyper Market | Retail |
| Snow Comms Conceptual Communications & Events | Media |
| Solar Qatar Contracting Company | Construction |
| Solar Qatar Contracting WLL | Construction |
| SOLARLINE TRADING WLL | Conglomerates |
| Solid General Construction Qatar | Construction |
| Sonata Software Ltd | Information Technology |
| Sora Marine Services Co Ltd | Conglomerates |
| SOSCO W.L.L. | Industrial Manufacturing |
| Sound on Wheels | Telecommunications |
| source supply logistics | Industrial Manufacturing |
| South West Architecture | Construction |
| Special Projects Services Company W.L.L. | Industrial Manufacturing |
