| iC Consult Group GmbH | |
| ic med EDV-Systemlösungen für die Medizin GmbH | Saxony-Anhalt |
| iC-Haus GmbH | Rhineland-Palatinate |
| iCADA GmbH | Rhineland-Palatinate |
| icanoMAB GmbH | |
| ICC Intelligent Platforms GmbH | |
| IceWarp GmbH | |
| ICF Systems AG | Hesse |
| ICG Engineering | |
| ICG Informatics Consulting GmbH | |
| ICH Hamburg | |
| Ichbinleise | Baden-Württemberg |
| Ichinga GmbH | |
| ICHORtec GmbH | |
| ICO Innovative Computer GmbH | Rhineland-Palatinate |
| ICOCO - Media Solutions, Keldenich & Weinberg GbR | North Rhine-Westphalia |
| ICOdata GmbH | |
| Icognito GmbH | |
| ICOM Software Research | North Rhine-Westphalia |
| Icon Group GmbH | |
| ICON Informationssysteme GmbH | Saarland |
| Iconec GmbH | Bavaria |
| IconExperience | Brandenburg |
| Iconic Marketing | |
| Iconics GmbH | Baden-Württemberg |
| Iconmonstr | North Rhine-Westphalia |
| IconScreen | Hamburg |
| ICR Automation GmbH & Co. KG | Mecklenburg-Vorpommern |
| ICS Intelligent Communication Software GmbH | Bavaria |
| ICS International GmbH | Hesse |
| ICSY AG | Rhineland-Palatinate |
| ICT Digital Solutions GmbH | |
| ict Informatik GmbH | |
| ICTJOB Deutschland Gesellschaft mit beschränkter Haftung | |
| ID Mediengestaltung | Thuringia |
| ID-LABEL GmbH | Schleswig-Holstein |
| ID.KOM Networks GmbH | Bavaria |
| iDA Smart Digital Solution GmbH | |
| IDABAS Crusius e.K. | Bavaria |
| IDAT GmbH | Hesse |
| Idea Camp UG (haftungsbeschränkt) | Bavaria |
| IdeaClouds | |
| Ideal Maschinenbau GmbH | Bavaria |
| Ideal Software + Service GmbH | Bavaria |
| IDEAL Software GmbH | North Rhine-Westphalia |
| IDEALworks GmbH | |
| IdeaSoft | |
| ideCAD | Lower Saxony |
| IDENCOM Germany GmbH | Berlin |
| Identass GmbH & Co. KG | Hesse |