| Click Solutions GmbH | |
| Clickconcepts GmbH | Baden-Württemberg |
| Clickfineon | Rhineland-Palatinate |
| Clicks Digital GmbH | |
| CLICKSPORTS GmbH | Bavaria |
| clickworker GmbH | North Rhine-Westphalia |
| Climate Founders GmbH | |
| Climatiq Technologies GmbH | |
| Climedo Health GmbH | |
| Clink | |
| Cliptec GmbH | Lower Saxony |
| Clockodo | North Rhine-Westphalia |
| Cloud Monsters GmbH | |
| Cloud Prophets GmbH | |
| Cloud Ready Software GmbH | |
| Cloud&Heat Technologies GmbH | Saxony |
| CloudComputing-Insider | |
| CloudConvert | |
| Cloudeo | |
| CloudFest | |
| Cloudflight | |
| CloudGears UG (haftungsbeschränkt) | |
| Cloudification | |
| cloudKleyer Frankfurt GmbH | |
| CloudLab Sales & Management GmbH | |
| CloudMade Deutschland GmbH | Bavaria |
| CLOUDPILOTS Software & Consulting GmbH | |
| Cloudplan GmbH | |
| CloudRAIL GmbH | Baden-Württemberg |
| Cloudwharf GmbH | |
| Cloudwürdig GmbH | |
| CLP GmbH | Bavaria |
| Clue | Berlin |
| Cluster One GmbH | North Rhine-Westphalia |
| CM Software & Consulting GmbH | Lower Saxony |
| CM Solutions Services & Consulting GmbH | |
| CM1 GmbH | |
| CMM Consulting Unternehmensberatung Michael Mühling e.K. | North Rhine-Westphalia |
| CMMarent GmbH | Berlin |
| CMOS GmbH | Lower Saxony |
| CMS Corporate Marketing Services GmbH | Hesse |
| CMS IT-Consulting GmbH | Bavaria |
| cmsLight | Baden-Württemberg |
| cmt Computer- und Management Trainings GmbH | Bavaria |
| CNC-Technik Peter Israel GmbH | Hamburg |
| CnK Webdesign | Saxony |
| CNS Computer & Netzwerk Service GmbH | Bavaria |
| CNS Computer Network Systemengineering GmbH | North Rhine-Westphalia |
| CNS Paderborn GmbH | North Rhine-Westphalia |
| CNS-IT GmbH | |