| Name | Region |
|---|---|
| Association www.bzh | Finistère |
| AssoConnect | |
| Assurly | Paris |
| AssystPC Informatique | |
| Astase | Paris |
| ASTech Paris Région | Paris |
| Astelle | Métropole de Lyon |
| Aster App | |
| Aster Capital | Paris |
| Asterop | Val-de-Marne |
| astorya.vc | |
| Astran | |
| Astraveus | |
| Astrolab | Haute-Garonne |
| Astrolabe CAE | |
| Asynpro | Alpes-Maritimes |
| Asys | Paris |
| AT Internet | Gironde |
| AT WEB | Seine-Maritime |
| At-home Productions | Val-d'Oise |
| Atalan | Paris |
| Atamyo Therapeutics | |
| Ataraxie | Aude |
| Atchik | Haute-Garonne |
| ATE | Nord |
| ATE Dev | |
| ATEA | Paris |
| Atelec Électronique | Indre-et-Loire |
| Atelier B | Bouches-du-Rhône |
| Atelier Carde | Haute-Vienne |
| Atelier D. Clic | Seine-Saint-Denis |
| Atelier OZ | Hauts-de-Seine |
| Atelier Provence Multimédia | Bouches-du-Rhône |
| Ateliers CYM | Paris |
| Atem | |
| ATÉMIS | Loire-Atlantique |
| Atermes | Yvelines |
| Atessia S.A.S. | |
| Atexa électronique | Loir-et-Cher |
| Atexweb | Nord |
| ATF Gaia | |
| ATHENA Global Services | Seine-Saint-Denis |
| Athenian S.A.S. | |
| Athesi | |
| Athlane Consult | Paris |
| Atila Diffusion | Bouches-du-Rhône |
| Atilog | Métropole de Lyon |
| ATIM Radiocommunications | Isère |
| Atipix | Yonne |
| Atiweb |