| Couplink Group AG | North Rhine-Westphalia |
| Covert Science GmbH | |
| CovetMe | |
| Covomo Versicherungsvergleich GmbH | |
| Cowboy Venture UG (haftungsbeschränkt) | Berlin |
| 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 | |
| CPK Automotive GmbH & Co. KG | North Rhine-Westphalia |
| cplus Informationssysteme und -beratung GmbH | Schleswig-Holstein |
| CPN Cooperation Network GmbH | |
| CPN Satellite Services GmbH | Hesse |
| Cpro Industry Projects & Solutions GmbH | |
| CPS Administration GmbH | Rhineland-Palatinate |
| CPS Systemhaus GmbH | Baden-Württemberg |
| CPS-Datensysteme GmbH | Rhineland-Palatinate |
| CPS-IT GmbH | Berlin |
| CPTx | |
| CPTx | |
| CPU IT-Dienstleistungen GmbH | Saarland |
| CPU Software & Service GmbH | Saxony |
| CPU Softwarehouse AG | Bavaria |
| CPU-net e.K. | |
| Craftview Software GmbH | |
| Cramer & Consorten GmbH | Hamburg |
| Crash-PC-Service GmbH | Berlin |
| Crazy Compilers | Bavaria |
| CreAktiv komma münchen GmbH | |
| CreaLog GmbH | Bavaria |
| Crealytics GmbH | |
| Creanetsoft | Thuringia |
| CREATEOCEANS GmbH & Co. KG | North Rhine-Westphalia |
| CREATHOR VENTURE Management GmbH | Hesse |
| Creative Glue Lab | |
| Creative Media Service GmbH | Bavaria |
| Creative Promotion | Baden-Württemberg |
| Creative Soft-& Hardware | Hesse |
| Creative-Networks Application Development UG (haftungsbeschränkt) | Bavaria |
| creative-webdesign | Hesse |