| Companisto GmbH | |
| Company Consulting Team e.V. | |
| Company Express Software GmbH | Saxony |
| Companyon Analytics GmbH | |
| Compart IT-Solutions GmbH | |
| Compass Computer Anwendungs- und Service GmbH | Baden-Württemberg |
| Compass Software GmbH | North Rhine-Westphalia |
| CompData Computer GmbH | Baden-Württemberg |
| Compendor GmbH | |
| Compeon GmbH | |
| compeople AG | |
| COMPESO Computerperipherie und Software GmbH | Bavaria |
| CompetenceWare - IT Service und Software GmbH | North Rhine-Westphalia |
| Complement AG | Bavaria |
| Complement Therapeutics GmbH | |
| Compleo Charging Solutions GmbH & Co. KG | |
| Complero GmbH | |
| Completho Software GmbH | North Rhine-Westphalia |
| complingua GmbH | North Rhine-Westphalia |
| ComPlott Papier Union GmbH | North Rhine-Westphalia |
| Compo GmbH | |
| componeo GmbH | Berlin |
| Comporsys Hansa GmbH | Schleswig-Holstein |
| COMPOSE it-systemhaus | Hesse |
| CompoTEK GmbH | Bavaria |
| Compredia GmbH | Bremen |
| Compredict GmbH | |
| Comprehensive TeX Archive Network | |
| Compris Intelligence GmbH | Rhineland-Palatinate |
| Compro Electronic GmbH | Lower Saxony |
| Compronet GmbH | Bavaria |
| Compu-Aid | Bavaria |
| compucops GmbH | Brandenburg |
| Compudent Praxiscomputer GmbH & Co. KG | Rhineland-Palatinate |
| CompuGO IT-Systemhaus GmbH | |
| CompuGroup Medical SE & Co. KGaA | |
| COMPUKON Computersysteme und Netzwerktechnik GmbH | Berlin |
| CompuMaster GmbH | Rhineland-Palatinate |
| Compumedia Gesellschaft für Informationsgestaltung mbH | |
| CompuMess Elektronik GmbH | Bavaria |
| Compumi Michael Sellenschlo | |
| cOMPunity | North Rhine-Westphalia |
| CompuRAM GmbH | Bavaria |
| Computeaid | |
| Computec GmbH | Baden-Württemberg |
| Computec Media GmbH | |
| Computer & Media VF | Hesse |
| Computer & Zubehör Thun GmbH | North Rhine-Westphalia |
| Computer Allertei | |
| Computer Bauer GmbH | Bavaria |