| Aily Labs | |
| Aimeos GmbH | |
| AIMS-Databridge | Bavaria |
| Aios Consulting GmbH | |
| AIPERIA | |
| AIR Electronics GmbH | Baden-Württemberg |
| Airbus Bank GmbH | |
| Aircraft Elektro/Elektronik System GmbH | Bremen |
| Airdata AG | |
| Airfocus | |
| AirITSystems GmbH | |
| Airpas Aviation AG | Lower Saxony |
| Airpro Game | Hamburg |
| AIRTEAM Aerial Intelligence GmbH | |
| Airteam Aerial Intelligence GmbH | |
| AIS AG | Hesse |
| Aisoma AG | Hesse |
| AISuperVision GmbH | |
| AIT GmbH & Co. KG | Baden-Württemberg |
| AIT Software GmbH | Bavaria |
| Aiticon GmbH | Hesse |
| Aivy GmbH | |
| Aix Scientifics | |
| AIXhibit AG | North Rhine-Westphalia |
| AIXhibit media services KG | North Rhine-Westphalia |
| Aixtron SE | |
| aixwave Mediendesign GmbH & Co. KG | |
| AJ Blomesystem GmbH | Thuringia |
| AJ&Smart GmbH | |
| AJE Consulting GmbH & Co. KG | Rhineland-Palatinate |
| ak Melkonian Cross Media Lösungen | Hesse |
| AK Software, Inc. | |
| ak tronic Software Services GmbH | North Rhine-Westphalia |
| AK-Funktechnik GmbH | Bavaria |
| AK-Industrieinformatik GmbH | Bavaria |
| AK-Nord GmbH | Lower Saxony |
| AKA Ausfuhrkredit-Gesellschaft mbH | |
| AKAD Bildungsgesellschaft mbH | Baden-Württemberg |
| Akademie der Bildenden Künste Nürnberg | |
| Akademie für Raumentwicklung in der Leibniz-Gemeinschaft | |
| akademie.de asp GmbH & Co. Betriebs- & Service KG | Berlin |
| Akap Software Technologies GmbH | Hesse |
| Akbank AG | Hesse |
| Akcay-Schwarz Consulting GmbH | |
| AKD Software & Consulting UG (haftungsbeschränkt) | North Rhine-Westphalia |
| AKD-Data GmbH | |
| AKDB Hauptverwaltung | Bavaria |
| Akea Hamburg | Hamburg |
| AKG Software Consulting GmbH | Baden-Württemberg |
| AKG Software Consulting GmbH | |