| Action International Services LLC | Industrial Manufacturing |
| Ad Astra WLL | Construction |
| Adam Import & Export & Real Estate | Real Estate |
| Adept Tech | Information Technology |
| ADIB Qatar | Financial Services |
| Advance Technologies & Solution | Information Technology |
| Advanced Business Computing W.L.L. | Information Technology |
| Advanced Technical Services W.L.L | Education |
| AEA Designs | Services |
| AECOM Middle East - Doha | Construction |
| Aegis Services W.L.L. | Services |
| Aero Freight Company Limited | Transport |
| Affinity Logistics Co WLL | Services |
| AFFIX SCAFFOLDING WLL | Construction |
| AGA-MEP Contracting & Engineering Co. LLC. | Construction |
| Agbizz Events and Media | Media |
| Age Corporation WLL | Construction |
| Agial Enterprises | Construction |
| Ahli Bank Q.S.C. | Financial Services |
| Ahli Brokerage Company S.P.C. | Financial Services |
| AHMED S AL SAYED ACCOUNTING & AUDITING | Financial Services |
| AIG MEA Limited - Qatar | Financial Services |
| AIMS Trading & Contracting | Services |
| Aiwa Trading Maintenance & Contracting WLL Qatar | Services |
| Ajman Trading Co WLL | Food and Beverages |
