| Aquium | Gironde |
| AR Ingénierie | Meurthe-et-Moselle |
| AR Technologie | Aube |
| AR-TIC | Métropole de Lyon |
| Arago Consulting | Paris |
| Aragon-Technologies | Saône-et-Loire |
| Arakis | Drôme |
| Aramis Formation | Loire-Atlantique |
| Aramis Telecom | Haute-Garonne |
| Aramys | Pas-de-Calais |
| Aranet | Oise |
| Aratice | |
| Arbo-com | Bouches-du-Rhône |
| ARCAD Software | Haute-Savoie |
| Arcel | Métropole de Lyon |
| Arcep | Paris |
| Archimed | Nord |
| Archive-Host | Côte-d'Or |
| ArchParc | |
| ArciTek | |
| Arcom | |
| ARCOS Technologies | Haute-Garonne |
| ARD | Hautes-Alpes |
| Ardans S.A.S. | Yvelines |
| Ardara | Ille-et-Vilaine |
| Ardèche Computer | Ardèche |
| Ardent Software France S.A.R.L. | Hauts-de-Seine |
| Ardoiz | |
| ARealTI | |
| Arelis | Meuse |
| Arenametrix | |
| ARESTE Informatique | Puy-de-Dôme |
| ARF Test | Isère |
| Arfitica | Paris |
| Arganne S.A.R.L. | Métropole de Lyon |
| ARGO | Hérault |
| Argo-Design | Bas-Rhin |
| Aria Électronique | Ariège |
| Aria S.A.S. | |
| ARIA Technologies | Hauts-de-Seine |
| Ariadis | Bouches-du-Rhône |
| ArianeGroup | |
| Arianespace | Essonne |
| Ariase | Ille-et-Vilaine |
| Aricia | Jura |
| ARIS | Loire-Atlantique |
| Arkadin Cloud Communications | Paris |
| Arkance Systems | |
| Arkéa Banking Services | Val-de-Marne |
| ARKETEAM IDF | Hauts-de-Seine |