| Auf Der Bult | |
| Aufderheide Webdesign | Lower Saxony |
| Augenklang Webdesign | Saxony |
| Augmented Minds Ambrus & Lonau GbR | |
| AugmentedMind.de | |
| Augmento | |
| August Fichter GmbH | |
| AUREX GmbH | |
| Aurint Software | Mecklenburg-Vorpommern |
| Austerlitz Electronic GmbH | Bavaria |
| AUSY Technologies Germany AG | |
| AutarcTech GmbH | |
| AUTEC Gesellschaft für Automationstechnik mbH | Rhineland-Palatinate |
| Autec GmbH | Saarland |
| autentek development | |
| Authada GmbH | |
| Authensis AG | Bavaria |
| Authentic Network GmbH | |
| Authoreon.io | |
| authorized.by GmbH | |
| Auticon | |
| AutLay – Automatisches Layout GmbH | |
| Auto Fleet Control GmbH | |
| Autoactiva Werbeagentur GmbH | |
| Autodesk GmbH | Bavaria |
| Automaited | |
| Automat Berlin GmbH | |
| Automaten Hofmann GmbH | Hesse |
| Automaten Technik Baumann GmbH | Bavaria |
| Automation + Productivity AG | Baden-Württemberg |
| Automation Dr. Nix GmbH & Co. KG | North Rhine-Westphalia |
| Automation Technology GmbH | |
| Automation Uhr GmbH | Thuringia |
| Automation W+R GmbH | Bavaria |
| Automation24 GmbH | |
| Automedia GmbH | |
| Autometer Meß- und Automatisierungstechnik GmbH | North Rhine-Westphalia |
| Automotive Hosting Partner GmbH | North Rhine-Westphalia |
| Automotive Security Research Group | |
| Autonomo GmbH | |
| autoRetouch | |
| Autosar | Bavaria |
| autronic electronic-service GmbH | Baden-Württemberg |
| AUVESY GmbH | |
| Auvista | Bavaria |
| Auxmoney GmbH | |
| Auxolar GmbH | |
| AV Digital Media GmbH | |
| AV-TEST GmbH | Saxony-Anhalt |
| AVACOMM Systems GmbH | Bavaria |