| Absend.net | |
| ABSICHT GmbH | |
| AbsInt | Saarland |
| Absolut Digital 2.0 GmbH | |
| Absolut Research GmbH | |
| Absolute Media GmbH | North Rhine-Westphalia |
| Absolute Software GmbH | Hamburg |
| ABSOLUTE Software GmbH | |
| Absoluto GmbH | Hesse |
| abspace | Baden-Württemberg |
| Abstract-Technology GmbH | |
| Abstracto Medienstudio | North Rhine-Westphalia |
| ABSTRAKT design | North Rhine-Westphalia |
| Abtinet e.K. | |
| Abtis GmbH | Baden-Württemberg |
| Abtwittern | Saxony |
| Abviris Deutschland GmbH | |
| ABX-CRO | Saxony |
| Abylonsoft | Rhineland-Palatinate |
| AB_DATE Engineering Software | North Rhine-Westphalia |
| AC Süppmayer GmbH | Saarland |
| AC-Systems GmbH | |
| ACA GmbH | Baden-Württemberg |
| ACA-pharma concept GmbH | |
| Academa GmbH | |
| Academy Design | Bavaria |
| Academy Europe Ltd | |
| Acadon AG | North Rhine-Westphalia |
| Acandis GmbH | |
| Acantara | North Rhine-Westphalia |
| Acardo Group AG | |
| ACC electronic HUTH | Bavaria |
| accadis Bildung GmbH | |
| Acceed GmbH | North Rhine-Westphalia |
| Acceleraid | |
| Accelerator Frankfurt | Hesse |
| Accellence Technologies GmbH | Lower Saxony |
| Accemic Technologies GmbH | Bavaria |
| Accentize GmbH | |
| AcceptIT GmbH | North Rhine-Westphalia |
| Access-Profi-Pool e.V. | Berlin |
| accis Systemhaus Gesellschaft für neue Medien mbH | Berlin |
| Accso – Accelerated Solutions GmbH | |
| ACCURE Battery Intelligence GmbH | North Rhine-Westphalia |
| ACE-Solutions | Baden-Württemberg |
| AceBIT GmbH | Hesse |
| ACELR8 | |
| Acent AG | Berlin |
| Acento | Schleswig-Holstein |
| Achim Dräger und Raffael Burgardt GbR | Saarland |