| Corail Systems | Hauts-de-Seine |
| Coralis | Bouches-du-Rhône |
| Coralline Informatique | Val-de-Marne |
| Core Biogenesis | |
| Core For Tech | |
| Corebridge Systems | Paris |
| CORIM Solutions | Isère |
| Coriware | Haute-Garonne |
| Cornec S.A.S. | Seine-et-Marne |
| Cornouaille Informatique | Finistère |
| Corse Diffusion Informatique | Haute-Corse |
| Corse Telecom | Corse-du-Sud |
| Corsicaweb | Haute-Corse |
| Corteria Pharmaceuticals | Paris |
| Cortextech | Oise |
| Cortosys | Paris |
| CorWave S.A. | |
| Corwin | Somme |
| CORYENT Conseil | Yvelines |
| Cosiweb | Haute-Garonne |
| Cosmian | |
| Cosmic Software | Val-de-Marne |
| Cosmo Tech | |
| Cosmopolit | |
| Cosmos Consultants S.A.S. | Paris |
| Cosmosoft | Seine-Saint-Denis |
| Cosoluce | Pyrénées-Atlantiques |
| Cosy.io | Paris |
| COTEP | |
| Côteweb | Alpes-Maritimes |
| Cotranet | Isère |
| Couleur & Connection | Rhône |
| Courcelles Design | Haute-Garonne |
| Cours de maths 78 | Paris |
| CourtBouillon | |
| Courtigo | |
| Coussin Viktor | |
| Couthon Conseil | Hauts-de-Seine |
| Coworkshop | |
| Cozynergy | |
| Craft AI | |
| Cram | |
| CRDEP | Essonne |
| Créa-BOX.com | Nord |
| Créa-Com | Seine-et-Marne |
| CREA2F | Haute-Garonne |
| Creabilis | Haute-Garonne |
| Créajeux | Gard |
| Créalia Occitanie | |
| Créalia Occitanie | |