| Name | Type | Country |
|---|---|---|
| Camera-contact | Enterprise | Spain |
| CBT | Enterprise | Spain |
| Cegasa Internacional | Enterprise | Spain |
| CENTRE D'ACCOMPAGNEMENT DE PROJETS INNOVANTS ASBL | Enterprise | |
| Centre for Research and Technology | Enterprise | Greece |
| CGI | Enterprise | Spain |
| Checkwatt AB | Enterprise | Sweden |
| CIC TOURGUNE | Enterprise | Spain |
| CIRCE | Enterprise | Spain |
| Climate Alliance | Enterprise |