| Specialized Aluminium and Steel Company | Conglomerates |
| Specialized Filters & Trading Co WLL | Conglomerates |
| Specialized Professional Contractors | Industrial Manufacturing |
| Specialized Trading & Filters | Construction |
| Spectra Arts Company LLC | Industrial Manufacturing |
| Speed Line Printing Press | Media |
| Speed Marine EST Qatar | Services |
| Speetech International Co WLL | Conglomerates |
| Spider Style Tower Cleaning WLL | Services |
| Spring International Trading and Contracting WLL | Services |
| Sprint Trading | Consumer Goods |
| Square Architects Contracting Engineering | Construction |
| SSH - Qatar | Construction |
| ST Cargo | Services |
| Staff Source International | Services |
| Stardelta Trading and Cont, WLL | Construction |
| Sterling & Wilson Middle East WLL | Construction |
| Stratiss Qatar W.L.L. | Information Technology |
| Stream Industrial & Engineering Company W.L.L. | Construction |
| Strong Rent A Car | Transport |
| Style for Steel Engineering & Metal Casting WLL | Industrial Manufacturing |
| Sultan Al-Abdulla & Partners | Services |
| Sunrise Trading & Contracting Co | Conglomerates |
| Supreme Committee for Delivery & Legacy | Services |
| Supreme Education Council - Qatar | Governmental Institutions |
