| Outsight S.A. | Paris |
| Outsight S.A. | |
| Outsourcia | Hauts-de-Seine |
| Outsourcing Network Intelligence S.A.S. | Val-d'Oise |
| OutWit Technologies | Hauts-de-Seine |
| Ouvaton | |
| Ouvrez la boite | Bouches-du-Rhône |
| OVEA | Hérault |
| Oveanet | Hérault |
| Oveliane | Hauts-de-Seine |
| Over-Link S.A.S. | Alpes-Maritimes |
| OverBlog | Haute-Garonne |
| Overscan | Puy-de-Dôme |
| OVH Télécom | Nord |
| OVHcloud | |
| Ovio Optics | Eure |
| Ovotor | |
| OW2 Consortium | Paris |
| Owea S.A.R.L. | Calvados |
| Owlint | |
| OWN | |
| Ownpage | |
| Ownpage | |
| Oxade Consulting | Paris |
| Oxalys | Hauts-de-Seine |
| Oxatis | Bouches-du-Rhône |
| Oxeltis | |
| OXER Technologies | Bouches-du-Rhône |
| Oxeva | |
| Oxiane | Hauts-de-Seine |
| Oxicat | Val-de-Marne |
| OxyCrea | Haute-Garonne |
| Oxyd | Hauts-de-Seine |
| Oxygeno | |
| Oxylog | |
| Oxymel | Yvelines |
| OXYMIUM S.A.R.L. | Paris |
| Oxymum | Yvelines |
| Oxynel | Hérault |
| Oyez | Paris |
| OZ Biosciences | |
| Ozanges | Charente |
| Ozis informatique et internet | Loir-et-Cher |
| P & I - Echophone | Haute-Garonne |
| P.Factory | Bouches-du-Rhône |
| PAARLY | |
| PAC Informatique | Marne |
| Pac.Jobs | Bouches-du-Rhône |
| Pacte Novation | Hauts-de-Seine |
| Padoa | |