| Abacom Informatique | Oise |
| Abactalab | Métropole de Lyon |
| AbaLog | Côtes-d'Armor |
| ABC Informatique | |
| ABC Marketing | Paris |
| ABC Prototype | Haute-Garonne |
| Abeille Informatique | Puy-de-Dôme |
| Abénex | |
| Abeos | Isère |
| Abergraphique | Finistère |
| Aberia | Hérault |
| ABF Décisions | |
| ABh Conseil | Lot |
| ABICOM | Puy-de-Dôme |
| Abileapty S.A.R.L. | |
| Abilitech Informatique | Seine-et-Marne |
| Abilways Digital | Paris |
| Abimedia | Paris |
| Abimes Concept | Isère |
| Abionyx Pharma S.A. | |
| ABISS MMB | Paris |
| Abivax | |
| ABL Informatique | Marne |
| AbLink Sites Internet | Tarn |
| ABlogiX | |
| Ablys | Paris |
| ABMH | Landes |
| Abonite Consultants | |
| Abonline Solutions | Paris |
| Abor | Aveyron |
| abr informatique | Essonne |
| Abracadabra PDF | Vaucluse |
| Abraxas Création | Vendée |
| Absolight | Paris |
| Absolom Design | Haute-Garonne |
| Absolute Group | Yvelines |
| Absolute PC | |
| Absolute Web | Seine-et-Marne |
| ABSYS | Hérault |
| Absys Cyborg | Hauts-de-Seine |
| ABSYS Informatique | Vaucluse |
| Absyss | Hauts-de-Seine |
| Abtel | Gard |
| AbulÉdu | Gironde |
| Abvent | Paris |
| ABW Advanced Business Ware | Bas-Rhin |
| Abyss Ingénierie Informatique | Ille-et-Vilaine |
| Abyssale | |
| Abysse | Métropole de Lyon |
| AC2S | Alpes-Maritimes |