| CNT-Ehrlich | Lower Saxony |
| co-operate Wegener & Rieke GmbH | |
| Co-Writer | |
| CO.DON GmbH | |
| co.Tec Gesellschaft für Softwaredistribution mbH | Bavaria |
| CO2BioClean GmbH | |
| CoachClub | Berlin |
| COAX Computerlösungen | Berlin |
| COBE GmbH | Bavaria |
| CobiNet – Fernmelde- und Datennetzkomponenten GmbH | Baden-Württemberg |
| Cobit - Consuvation GmbH | Baden-Württemberg |
| Cobot | |
| Coboworx GmbH | |
| Cobra Computer Systeme GmbH | Baden-Württemberg |
| Cobrainer GmbH | |
| COC AG | Bavaria |
| CoCoLab | Baden-Württemberg |
| Cocologics GmbH | |
| Cocomore AG | Hesse |
| CoCoNet AG | |
| Cocus AG | |
| coda Unternehmensberatung | Baden-Württemberg |
| Code & Co. GmbH | |
| Code Design Studio | Berlin |
| Code Intelligence GmbH | |
| Code it oHG | |
| Code Leap AG | |
| Code Mercenaries Hard- und Software GmbH | Brandenburg |
| CODE University of Applied Sciences | Berlin |
| Code White GmbH | |
| code-b Agile Websolutions GmbH | |
| Code4Business | North Rhine-Westphalia |
| Codeberg e. V. | |
| Codec Softwareentwicklung GmbH | |
| CodeCamp:N GmbH | |
| Codecasters GmbH | Bavaria |
| Codecentric AG | North Rhine-Westphalia |
| CodeCheck | |
| Codecks GmbH | |
| CodeControl | |
| CodeCooperation GmbH | |
| CodeDoor | |
| CodeEffect GmbH | |
| CodeFlügel GmbH | |
| codeitlabs GmbH | |
| Codekabinett | Hesse |
| CoDeMa Consulting GmbH | |
| Codepan GmbH | |
| Codept GmbH | |
| Coder Society GmbH | |