| KCS Kellerer | |
| KD Elektroniksysteme GmbH | Saxony-Anhalt |
| KD Kellerdigital GmbH | |
| KDCS Computer Services | Baden-Württemberg |
| KDG Wittenberg - Kommunale Datenverarbeitungsgesellschaft mbH | Saxony-Anhalt |
| KDO Service GmbH | Lower Saxony |
| KECK GmbH | |
| Keck-DSB GmbH | Bavaria |
| Keding Computer-Service | Hamburg |
| Keen Games GmbH & Co. KG | Hesse |
| KEEP IT SIMPLE Information & Organisation GmbH | Hamburg |
| KeePass Password Safe | Baden-Württemberg |
| KeePassXC | Thuringia |
| KeepTool GmbH | Berlin |
| Keese IT GmbH | |
| Keith & Koep GmbH | North Rhine-Westphalia |
| KEK Anwendungssysteme GmbH | |
| Keklik & Weber GbR | Baden-Württemberg |
| Keller & Kollegen | Bavaria |
| Kemmler Electronic GmbH | Baden-Württemberg |
| Kenbi GmbH | |
| Kenjo GmbH | |
| kenmedia | |
| Kenner Soft | |
| KEO GmbH | North Rhine-Westphalia |
| Keppler IT GmbH | Bavaria |
| Kern AI GmbH | |
| KERN Ingenieurkonzepte | Berlin |
| Kern Tec GmbH | |
| kernpunkt Digital GmbH | North Rhine-Westphalia |
| Kertos GmbH | |
| Kesa Technische Software GmbH | Lower Saxony |
| Keßler Solutions | Saxony |
| Kesseböhmer Holding KG | |
| KESSLER Design | Bavaria |
| KESSLER Software GmbH & Co. KG | Lower Saxony |
| Kessler-Medien | Saarland |
| Keudel av-Technik GmbH | Baden-Württemberg |
| Kewazo GmbH | Bavaria |
| KewBee GbR | Hesse |
| KeY Project | |
| Key-Systems GmbH | Rhineland-Palatinate |
| Key-Work Consulting GmbH | Baden-Württemberg |
| Keybits GmbH | North Rhine-Westphalia |
| KeyLogic GmbH | Hesse |
| keySquare Network UG & Co. KG | |
| keytech Software GmbH | North Rhine-Westphalia |
| Keyweb AG | |
| kez.biosolutions GmbH | |
| KF Interactive GmbH | |