| Name | Region |
|---|---|
| Altameos Multimedia | Val-de-Marne |
| Altanis | Moselle |
| AltaPonthus | |
| Alteca | Métropole de Lyon |
| Altelios Technology | Paris |
| Altelis | Hauts-de-Seine |
| ALTEN Group | Hauts-de-Seine |
| Alter Création | |
| Alter SI | |
| Alter Solutions | |
| Alter Telecom | Paris |
| Alteriade | Métropole de Lyon |
| Alternative ERP | |
| Alternative Formation | Nord |
| Alternative mobile | |
| Altersis | Bouches-du-Rhône |
| Alterway | Hauts-de-Seine |
| Altice France | Paris |
| Altics | Métropole de Lyon |
| Altidev | Haute-Garonne |
| Altimax | Haute-Savoie |
| Altimesh S.A.S. | |
| Altinea S.A.S. | Jura |
| Altior | |
| Altipiano | Métropole de Lyon |
| Altiref | Alpes-Maritimes |
| Altiscom | Tarn |
| Altitem | Haute-Garonne |
| Altitude Infra | |
| Altixia Reim | |
| Alto Informatique | Paris |
| Altolabs | Paris |
| ALTOSPAM | Haute-Garonne |
| AltraBio | |
| Altrnativ | |
| Altronics | Métropole de Lyon |
| Altyse | Seine-Saint-Denis |
| Alvaria S.A.S.U. | Côtes-d'Armor |
| Alven Magazine | Paris |
| Alveos Ev | |
| Alvie 1 | |
| Alwaysdata | |
| Alyra | |
| Alyseo | Seine-Saint-Denis |
| Alzohis S.A.S. | |
| Alzprotect | |
| Alzura | |
| Am-Creation | Charente-Maritime |
| Amabis | Hauts-de-Seine |
| Amalgame |