| CapEval Pharma | |
| Capgemini | |
| Capinfo | Bas-Rhin |
| Capital Banking Solutions | Paris |
| Capital Games | |
| Caplaser | Tarn |
| Capsoft Ingénierie | |
| Captain Contrat | |
| Captain Data | |
| Capteo | Paris |
| Caption S.A.S. | |
| Captive | |
| Cara | Seine-Saint-Denis |
| Caranx Medical | |
| Carbon Maps | |
| Cardiawave | |
| Cardiologs | |
| Cardiorenal | |
| CARDIWEB | Paris |
| CareGame | |
| Cargo Information Network France | |
| Cari Electronic | Drôme |
| Carine Bel Studio | Haute-Savoie |
| CARL Software | Métropole de Lyon |
| Carlabella | Hauts-de-Seine |
| CARM2i | Val-de-Marne |
| Carmat | |
| Carredas | Nord |
| CARRENET | Hauts-de-Seine |
| CARRI Systems | Seine-Saint-Denis |
| Carroucell | |
| Cartadis | |
| Cartégie S.A.S. | |
| Cartelis | |
| Cartelmatic | Ille-et-Vilaine |
| Carteplus | Gironde |
| Carthera | |
| Cartocad | Métropole de Lyon |
| Cartouche | Haut-Rhin |
| CartoucheClub.com | Somme |
| cartouchemania.com | Paris |
| Cartoucheonline | Somme |
| Cartouches en stock | Paris |
| Cash Systèmes Industrie | Var |
| Cashbee S.A.S. | |
| Cashlab | |
| Cashmag | Var |
| CashNotify | |
| Cashpad | |
| Castel | Maine-et-Loire |