| QuantityWare GmbH | |
| QuantPi GmbH | |
| Quantum Alliance | |
| Quantum Brains | |
| Quantum Business Network UG (haftungsbeschränkt) | Bavaria |
| Quantum Capital Partners GmbH | Bavaria |
| Quantum Flagship | |
| Quantum Leap Ventures UG | Berlin |
| Quantum-Systems GmbH | |
| QuantumDiamonds | |
| Quantumrock GmbH | |
| Quantune Technologies GmbH | |
| Quarter Media GmbH | |
| Quartett mobile GmbH | Bavaria |
| Quassel IRC | Baden-Württemberg |
| Quattro Research GmbH | |
| Qubix Consulting GmbH | |
| QucsStudio | |
| Qudosoft GmbH & Co. KG | |
| QUEL Produktions- und Vertriebs-GmbH für Stromversorgungsanlagen | Bavaria |
| Quentic GmbH | |
| queo ventures GmbH | |
| Quest Global Engineering Services GmbH | |
| QuestNet GmbH | Bavaria |
| QUIMRON GmbH | Baden-Württemberg |
| Quintec Informationstechnologie GmbH | North Rhine-Westphalia |
| Quintenz Hybridtechnik GmbH | Baden-Württemberg |
| quintly GmbH | North Rhine-Westphalia |
| Quiply Technologies GmbH | |
| Quirion AG | |
| Quiss GmbH | Bavaria |
| Quite IT GmbH | Bavaria |
| QUORiON Data Systems GmbH | Thuringia |
| QuoVadis Software GmbH | Hesse |
| Qupaya Technologies GmbH | |
| Qurix Technology GmbH | |
| Qutools GmbH | |
| Qvest Media GmbH | North Rhine-Westphalia |
| Qzzr | |
| r&b webservice | |
| R&R/COM GmbH & Co. KG | Bavaria |
| R+K Unternehmensberatung GmbH | Baden-Württemberg |
| R-Biopharm AG | |
| R-NetWork GmbH | Hesse |
| r-tec IT Security GmbH | North Rhine-Westphalia |
| R. Bücker EDV-Beratung Datentechnik GmbH | North Rhine-Westphalia |
| R. Sattler Consulting | North Rhine-Westphalia |
| R.B.COM GmbH | Bavaria |
| R.K. Consulting GmbH | Bavaria |
| r24 Holding GmbH | |