| ProLeiT Group | Bavaria |
| Prolink internet communications GmbH | Baden-Württemberg |
| PROLIX Automatisierungstechnik GmbH | Bavaria |
| Prologa GmbH | Saxony-Anhalt |
| ProLogic Computer GmbH | Bavaria |
| proLogistik GmbH & Co. KG | North Rhine-Westphalia |
| ProMaterial Technologies GmbH | |
| Promegis Gesellschaft für Geoinformationssysteme mbH | Lower Saxony |
| Prometheus UG | Lower Saxony |
| promiseQ GmbH | |
| Promo Datentechnik + Systemberatung GmbH | Hamburg |
| PromoCell GmbH | |
| Promotion Software | Baden-Württemberg |
| Prompt Software System GmbH | Bavaria |
| PromServer UG (haftungsbeschränkt) | Lower Saxony |
| ProNego | Saarland |
| proNet Informationssysteme GmbH | |
| ProNet Media GmbH | |
| Pronetic GmbH | |
| PRonline.de | |
| Prontonet GbR | Hamburg |
| Propaganda Solutions GmbH | |
| PropTech1 Ventures | Berlin |
| proPutare Netz- und Softwaretechnologie GmbH | Bavaria |
| Prosafe-Folientechnik GmbH | North Rhine-Westphalia |
| proseco software GmbH | Baden-Württemberg |
| ProServ Electronic GmbH | North Rhine-Westphalia |
| ProSieben Games | |
| ProSiebenSat.1 Accelerator | Bavaria |
| ProSiebenSat.1 Media SE | |
| Prosite | Berlin |
| ProSoft Krippner GmbH | Saxony |
| ProSoft Software Vertriebs GmbH | Bavaria |
| ProSolution Digital AG | North Rhine-Westphalia |
| Prostep AG | Hesse |
| Prosystems IT GmbH | North Rhine-Westphalia |
| ProtaGene | |
| ProTak GmbH | Bavaria |
| Protec Automation GmbH | Rhineland-Palatinate |
| ProTec Carrier Systems GmbH | |
| Protec GmbH | Bavaria |
| ProtectCom GmbH | Saarland |
| Protected Shops GmbH | Bavaria |
| protel Hotelsoftware GmbH | |
| Protembis | |
| Proteros Biostructures GmbH | |
| proton Computer Vertriebs GmbH | North Rhine-Westphalia |
| Protonic Software GmbH | |
| PROTOS Software GmbH | Bavaria |
| Protos Technologie GmbH | |