| Altia Consultores, S.A. | A Coruña |
| Altim | Madrid |
| Altiria | Madrid |
| Alto Analytics | Madrid |
| Altoro Consulting Group, S.L. | Madrid |
| Aluxion | |
| Alzanet SEO Services, S.L. | Madrid |
| AM System | Jaén |
| Amadeus IT Group S.A. | Madrid |
| Amadeus IT Group S.A. | |
| Amadix | Valladolid |
| Amalfi Analytics | Barcelona |
| AMETIC | Madrid |
| Amivia Internet | Tarragona |
| AMJ Telecom 3000, S.L. | Murcia |
| AMP Software, S.L. | Madrid |
| Amper, S.A. | Madrid |
| Amperis Products, S.L. | Lugo |
| Ampgrafico | Barcelona |
| Ample24 sccl | Barcelona |
| Amplitud-E | A Coruña |
| Amplya | Valencia |
| Amunidex, S.L. | La Rioja |
| Anaconda Biomed | Barcelona |
| Anacronico | Barcelona |
| Anadea | Alicante |
| AnaitGames | Barcelona |
| Análisis y Desarrollo de Software, S.L. | León |
| Analitia | Balearic Islands |
| analiZe | Zaragoza |
| Analyticalways, S.L. | Madrid |
| Anapharm Bioanalytics | Barcelona |
| Anatronic, S.A. | Madrid |
| Anboto | Biscay |
| Ancasa Soft, S.L. | Valencia |
| Anceu Coliving | |
| ANCO Sistemas de Gestión, S.A. | Barcelona |
| Andaira Technology | Madrid |
| Andbank España | |
| AndorraFreeMarket.com | Lleida |
| Andrés Brugarolas Martínez | |
| AndWebSol, S.L. | Málaga |
| Anelis Network | Alicante |
| Aner Sistemas Informáticos, S.L. | Gipuzkoa |
| Anescu - Informática y Comunicaciones, S.L.U. | Madrid |
| Anet.es | Navarre |
| Anfix Software, S.L. | Madrid |
| Angal | Castellón |
| Animo Diseño y Comunicación | Madrid |
| Anjana Data | Biscay |