| CoreNet GmbH | |
| Coreo AG | |
| Coress GmbH | Berlin |
| coreweb – Gesellschaft für consumer relevant web solutions mbH | |
| Coriolis Pharma Research GmbH | |
| Corpex Internet GmbH | Hamburg |
| Corporate Communication Networks GmbH | Bavaria |
| Cortago AG | Berlin |
| CorTec GmbH | |
| Corussoft GmbH | |
| COS Computer GmbH | |
| COS Geoinformatik & Systemhaus | Baden-Württemberg |
| COSA Software | Lower Saxony |
| COSCOM Computer GmbH | Bavaria |
| Cosee GmbH | |
| COSEW Computer Netzwerke Elektronik | Saxony-Anhalt |
| CosH Consulting GmbH | Bavaria |
| Cosifan Computersysteme GmbH | Saxony |
| Cosmetri GmbH | Berlin |
| Cosmigo GmbH | Saxony |
| Cosmo Consult AG | Berlin |
| CosmoCode GmbH | Berlin |
| Cosmolog GbR | Hesse |
| Cosmos GbR | Thuringia |
| Cosmoshop | Bavaria |
| cosmoworx IT-services | Hesse |
| Cosoba GmbH | Hesse |
| Cosoft Computer Consulting GmbH | North Rhine-Westphalia |
| Cosuno Ventures GmbH | Berlin |
| Cotronic GmbH | Schleswig-Holstein |
| Counter | |
| Couplink Group AG | North Rhine-Westphalia |
| Covert Science GmbH | |
| CovetMe | |
| Covomo Versicherungsvergleich GmbH | |
| Cowboy Venture UG (haftungsbeschränkt) | |
| CoWork-Lab UG | |
| Coworking Space Königstein | |
| Coworking-M1 | |
| Coworking0711 | |
| Coworkit | |
| CP Capital Pioneers GmbH | |
| CP Computer Projects GmbH | Hesse |
| CP Contech Electronic GmbH | North Rhine-Westphalia |
| CP Corporate Planning AG | Hamburg |
| cpa SoftwareConsult | Bavaria |
| CPB Software (Germany) GmbH | Bavaria |
| CPC Computer Profi Center GmbH | |
| CPG Finance Systems GmbH | Bavaria |
| CPI Technologies GmbH | |