| Computer Communication & Consulting | Bavaria |
| Computer Corner | Hesse |
| Computer Dienstleistung Günther | |
| Computer Extra, Ernst & Jacob KG | |
| Computer Haug GmbH | Baden-Württemberg |
| Computer History Online | Baden-Württemberg |
| Computer im Griff | Berlin |
| Computer Institut Bamberg | Bavaria |
| Computer Klinik GmbH | |
| Computer Konkret AG | Saxony |
| Computer Leipzig | Saxony |
| Computer Manufaktur GmbH | Berlin |
| Computer Output Management GmbH | Hesse |
| Computer Service & Vertrieb | Berlin |
| Computer Service Manthey | Berlin |
| Computer Service Peter Hartmann | Bavaria |
| Computer Service Stanglow | North Rhine-Westphalia |
| Computer Stamm GmbH | North Rhine-Westphalia |
| Computer Stick Service | |
| Computer Systems Technology GmbH | Hesse |
| Computer und Internet Service | Baden-Württemberg |
| Computer und Registrierkassen, Josef Tosi e.K. | Bavaria |
| Computer Universe GmbH | Hesse |
| Computer Wunsch Systems GmbH & Co. KG | North Rhine-Westphalia |
| Computer- und Büroelectronic GmbH | Hesse |
| Computer-base | Bavaria |
| Computer-L.A.N. GmbH | Hesse |
| Computer-Nachrichten.de | North Rhine-Westphalia |
| Computer-Service Hagen | North Rhine-Westphalia |
| Computerarchiv Muenchen | Bavaria |
| ComputerBase GmbH | |
| ComputerCentrum Lübbecke GmbH | North Rhine-Westphalia |
| Computerconsult GmbH & Co. KG | North Rhine-Westphalia |
| Computergeschichte.de + Homecomputermuseum.de | Baden-Württemberg |
| Computerhilfe Hamburg | Hamburg |
| Computerladen Kladow | Berlin |
| ComputerLine GmbH | |
| computermiete.de GmbH & Co. KG | Baden-Württemberg |
| Computerra GmbH | Hesse |
| Computers & Lessons GmbH | Bavaria |
| ComputerService Braunwarth | Bavaria |
| Computerservice Kevin Damitz | Berlin |
| Computerservice Ruckzuck | Saxony |
| Computerservice Sonja Riedel | Bavaria |
| Computerservice Stephan | Saxony-Anhalt |
| Computerservice-Seth | Baden-Württemberg |
| Computershop K. Schaab | Thuringia |
| Computerspielemuseum | Berlin |
| Computersysteme und Kommunikationstechnik GmbH | Saxony |
| Computerwelt Softwareentwicklungs GmbH | Hesse |