| APPLICATIO Training & Management GmbH | |
| Application Systems Heidelberg Software GmbH | Baden-Württemberg |
| Applied International Informatics GmbH | Berlin |
| Applied Systems Software und Systems GmbH | Hesse |
| AppliedSmartness GmbH | |
| AppLift GmbH | Berlin |
| Apploft GmbH | |
| Applord GmbH | North Rhine-Westphalia |
| APPlyzer | |
| Appmeisterei GmbH | Bavaria |
| Appmelder | |
| Appmotion GmbH | Hamburg |
| Appointmind | Schleswig-Holstein |
| Appollo Health Ventures | |
| Appon GmbH | Baden-Württemberg |
| appp media UG (haftungsbeschränkt) | Bavaria |
| apppex Product Development Prototypes Parts GmbH | |
| apprat.io by jocapps GmbH | |
| Apprime GmbH | Berlin |
| Appropo GmbH | |
| Apprupt | |
| Apps2Go GmbH | Brandenburg |
| AppSCREEN | |
| Appsfactory GmbH | |
| AppSichern | |
| Appsolute GmbH | Rhineland-Palatinate |
| Appsoluteweb Christoph Pförtner | Saxony |
| Appsoluts GmbH | |
| Apptrace | Berlin |
| APPUNK GmbH | |
| Appvisory | |
| appy.berlin GmbH & Co. KG | |
| AppYourself GmbH | |
| Apricoweb | Saxony |
| April & June GmbH | Berlin |
| APRIS Gesellschaft für Praxiscomputer mbH | Bavaria |
| APROtech GmbH | |
| APROXO GmbH | |
| APS GmbH | |
| apt-shop | Berlin |
| Aptarion Biotech AG | |
| Aptico GmbH | North Rhine-Westphalia |
| Apurano Pharmaceuticals GmbH | |
| AQAL Capital GmbH | |
| aqcon GmbH Consulting & Software | Baden-Württemberg |
| AquaSoft GmbH | Brandenburg |
| Aquila Capital Holding GmbH | |
| AqVida GmbH | |
| Arago GmbH | |
| araneaCONSULT GmbH | |