| Alice Biometrics, S.L. | Pontevedra |
| Alien Ventures | Madrid |
| Alien Ventures | |
| Aliquo Software | Madrid |
| Alisys | Madrid |
| All-In Factory, S.L. | |
| Allbit Solutions | Madrid |
| Allcom | Barcelona |
| Allenta Consulting | A Coruña |
| Allinagency | |
| Allinky Biopharma, S.L. | |
| AllRead Machine Learning Technologies, S.L. | Barcelona |
| Almirall, S.A. | Barcelona |
| Aloha Digital Group, S.L. | |
| Alojared | Madrid |
| Alpha Unmanned Systems, S.L. | Madrid |
| AlphaSIP | Zaragoza |
| Alta en buscaderos | Las Palmas |
| ALTAI Soft, S.L. | Madrid |
| Altamira Online, S.L. | Pontevedra |
| Alter Technology Tuv Nord, S.A. | Sevilla |
| Alter Technology Tüv Nord, S.A.U. | |
| Alterego Web Services, S.L. | Girona |
| Altia Consultores, S.A. | A Coruña |
| Altim | Madrid |
| Altiria | Madrid |
| Alto Analytics | Madrid |
| Altoro Consulting Group, S.L. | Madrid |
| AluGroup | |
| Aluxion | |
| Alzanet SEO Services, S.L. | Madrid |
| AM System | Jaén |
| Amadeus IT Group S.A. | Madrid |
| Amadix | Valladolid |
| Amalfi Analytics | Barcelona |
| Amara Marketing | |
| Ambigrama Estudio Creativo | |
| 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 |