| AIMPLAS | |
| AINIA | |
| AINUR | Madrid |
| Aira Centro de Informática, S.L. | A Coruña |
| Aira System | Madrid |
| Aire Networks | Alicante |
| Airplane Solutions | Barcelona |
| AIS – Aplicaciones de Inteligencia Artificial, S.A. | Barcelona |
| AISTech Space | |
| Aitana Management, S.L. | Valencia |
| Aitana Multimedia, S.L. | Valencia |
| AITEX Centro de Investigación e Innovación | |
| Aitiip Centro Tecnológico | |
| AIUDO | Valencia |
| Akaven | |
| Akiles Technologies, S.L. | Barcelona |
| Akimad Digital, S.L. | |
| Akrolis Software | Alicante |
| Akting | Gipuzkoa |
| Akun | Madrid |
| alaba a.i. | Madrid |
| Aladetres | Barcelona |
| Alan Communications, S.A. | Barcelona |
| Alanit | Alicante |
| Alantis Seed Capital, S.L. | Madrid |
| Alared Soluciones Web, S.L. | Santa Cruz de Tenerife |
| Alaros | Barcelona |
| Albada informática | Zaragoza |
| Albert Coronado | Girona |
| Alberto Varela | Biscay |
| Alcad Electronics | Barcelona |
| ALD Sistemas, S.A. | Madrid |
| Aldea Ventures | Barcelona |
| Aldebarán Tecnologias de la Informacion, S.L. | Madrid |
| Aldor Internet S.L.L. | Navarre |
| Alea Business Software, S.L. | Barcelona |
| Alecop | Gipuzkoa |
| Alejandro casas | Málaga |
| Alén Space | Pontevedra |
| Aleph Software, S.A. | Madrid |
| Alerce | Zaragoza |
| Alerion Technologies, S.L. | Gipuzkoa |
| Alfa9 | Madrid |
| Alfacamp Startups, S.L. | Sevilla |
| Alfred Smart | Barcelona |
| Algenex | Madrid |
| Alhostings | |
| Alia Multimedia | Granada |
| Alias Robotics | |
| Alias Robotics, S.L. | Álava |