| ATS Conseil | Val-de-Marne |
| ATSCAN | Ille-et-Vilaine |
| Atsukè | |
| Atsurf.net | Hérault |
| ATTHIS | Hauts-de-Seine |
| ATTIC+ | Puy-de-Dôme |
| Attoma | Paris |
| Aubay | Hauts-de-Seine |
| Aubert & Duval | |
| Audacy | Paris |
| Audec | Yvelines |
| AUDEL | Hauts-de-Seine |
| Audencia | |
| AudioWizard | |
| Audros | Métropole de Lyon |
| Augeo | Val-de-Marne |
| Augmenta | |
| Augural / Strateo | |
| Augure | |
| Augusta Reeves Group | |
| Aunis Informatique | Yonne |
| Auphys | Isère |
| AURA Equipements | Paris |
| Auriga | |
| Auriga Partners | |
| Aurobac Therapeutics | |
| Ausha S.A.S. | |
| Australis | Var |
| Australis Intelligence | Var |
| Austrine | |
| Ausy | Hauts-de-Seine |
| Authentic Group | Loire-Atlantique |
| Autis | Val-d'Oise |
| Auto-Entrepreneur.fr | |
| Auto-Gestion-Entrepreneur.fr | Paris |
| Automatismes Services | Seine-et-Marne |
| Automotive Cells Company | |
| Autorité des marchés financiers | |
| Autoweb-Creator | Nord |
| Auvergne Business Angels | |
| Auxicom | Loire-Atlantique |
| Auxilia | |
| Ava6 | |
| Avaelys | Bouches-du-Rhône |
| Avancenet | Paris |
| Avanguard | |
| Avanista | |
| Avanquest Software | Hauts-de-Seine |
| Avanseo S.A.S. | |
| AvantageWeb | Loire-Atlantique |