| jut-so GmbH | |
| jweiland.net | Baden-Württemberg |
| jwied GmbH & Co. KG | |
| JWiesemann.com | North Rhine-Westphalia |
| Jyloo Software | Bavaria |
| K & W Informatik GmbH | Saxony |
| K + B Electronic Systems GmbH | Rhineland-Palatinate |
| K Desktop Environment | Hesse |
| K&K Internet GmbH | Baden-Württemberg |
| K&M Computer GmbH & Co. KG | Bavaria |
| K&M Innotech GmbH | |
| K&P Computer | Hesse |
| K&P Gesellschaft für Automation mbH | |
| K+P Softwaretechnik | North Rhine-Westphalia |
| K-iS Systemhaus GmbH | North Rhine-Westphalia |
| K-Tech Elektronik Vertriebs GmbH | Bavaria |
| k-tech Konstruktion Automation Produktion GmbH | |
| K.M.T. Kramer Medientechnik GmbH | Schleswig-Holstein |
| k.u.r.s. Mediasystems GmbH | North Rhine-Westphalia |
| K1 Electronic GmbH | North Rhine-Westphalia |
| K15t | |
| K2 Mobility GmbH | |
| K2-Computer Softwareentwicklung GmbH | Saxony-Anhalt |
| K5 Advisors GmbH & Co. KG | |
| K5 Netzwerksysteme GmbH | Rhineland-Palatinate |
| KA Mediendesign | Rhineland-Palatinate |
| Kab24 GmbH | Baden-Württemberg |
| Kabelbaumfertigung GmbH | Bavaria |
| Kabelfreak | Rhineland-Palatinate |
| kabeltronik Arthur Volland GmbH | Bavaria |
| Kabelwerk Rhenania GmbH | North Rhine-Westphalia |
| Kaberna Consulting GmbH | |
| KACO new energy GmbH | Baden-Württemberg |
| Kadmos Technologies GmbH | |
| KADSOFT Computer GmbH | Saxony |
| KAEMI GmbH | |
| Kai Richard König | |
| Kairos GmbH | |
| KaiserCommunication GmbH | |
| KaiTech IT-Systems GmbH | North Rhine-Westphalia |
| Kajomi GmbH | Bavaria |
| KAL ATM Software GmbH | Bavaria |
| Kälberer All-In-One | Hesse |
| KALLISTO Software GmbH | North Rhine-Westphalia |
| Kälte Klima Sachsen GmbH | |
| Kalthoff GmbH | North Rhine-Westphalia |
| KaLUG | Baden-Württemberg |
| Kamaro Soft | |
| Kamasys GmbH | |
| Kamedia interactive GmbH | North Rhine-Westphalia |