| Name | Region |
|---|---|
| Opla.ai | |
| OPPIDA | |
| Opquast | Gironde |
| OPSI | Métropole de Lyon |
| Opteam Interactive | Seine-Maritime |
| Optelo | Paris |
| OptiFi | |
| Optilog | Tarn |
| Optim'BTP | Calvados |
| Optima | Gironde |
| OptimEnergi | |
| Optimiz Construction | |
| Optrium | Hauts-de-Seine |
| Oracle France | Hauts-de-Seine |
| Orakl Oncology S.A.S. | |
| Orange | Paris |
| Orange | |
| Orange Business Services | Paris |
| Orange Concept | Paris |
| Orange Cyberdefense | |
| Orange Fab | |
| Orange Lab France | |
| Orange Marine | Paris |
| Orange Store | |
| Orange Ventures | Paris |
| Orasys | |
| Orata | Isère |
| ORAY | Essonne |
| Orbeet | |
| Orbial | |
| Orbitica | Haute-Garonne |
| ORCA Informatique | Paris |
| Orchestra | Paris |
| ORDI 3000 | Hautes-Pyrénées |
| Ordi Clean S.A. | Métropole de Lyon |
| Ordi Plus | Gironde |
| Ordicare | Paris |
| Ordiclef | Aude |
| OrdiDocteur | Paris |
| Ordifun | Hauts-de-Seine |
| Ordilabo | Loire-Atlantique |
| OrdiLem | Eure |
| Ordinal Software | Hauts-de-Seine |
| Ordinatic | Seine-Saint-Denis |
| Ordiplat | Paris |
| OrdiService | Ille-et-Vilaine |
| Ordissimo | Hauts-de-Seine |
| Orditech | Bas-Rhin |
| Ordoclic | |
| Ordolog | Indre-et-Loire |