| C2P ENGINEERING |
| C2PLUS |
| C4HYDRO |
| CADIOU CHAUDRONNERIE PLASTIQUE |
| CALPEDA |
| CAP SYSTEMS |
| CAPRARI |
| CARSO CAE |
| CDI TECHNOLOGIES / VILLAGE INNOVATION |
| CEREMA |
| CERIB / VILLAGE BÉTON |
| CIFEC |
| CIFFA SYSTEMES |
| CIR |
| CISE TP / LES CANALISATEURS |
| CLAISSE |
| COC ENVIRONNEMENT |
| CODRA |
| COFUNCO |
| COHIN ENVIRONNEMENT |
| COMETEC |
| COMPOSE IT |
| COMPTEURS ZENNER |
| CONSEIL REGIONAL DE BRETAGNE |
| CP COMPOSITES |
| CREATEST |
| CRESEB |
| CRP / VILLAGE BÉTON |
| CSI CORDES / VILLAGE BÉTON |
| CSTB |
| CT2MC / VILLAGE INNOVATION |
| CUBIS SYSTEMS |
