| AMZ.One | |
| Andreas Monitzer | Vienna |
| Andreas Tasch | Burgenland |
| Andys Coworking Company GmbH | |
| ANEXIA Internetdienstleistungs GmbH | Carinthia |
| Angios GmbH | |
| Antagonis Biotherapeutics GmbH | |
| Antares NetlogiX Netzwerkberatung GmbH | Lower Austria |
| Antiloop GmbH | |
| AnYxis Immuno-Oncology GmbH | |
| AOP Orphan Pharmaceuticals GmbH | |
| APARUS | |
| APEIRON Biologics AG | |
| APEPTICO | |
| APEPTICO Forschung und Entwicklung GmbH | |
| APEX gaming technology GmbH | Upper Austria |
| APEX Ventures GmbH | |
| api Österreich GmbH | Lower Austria |
| APILayer | |
| Apollo.ai GmbH | |
| Aposcience AG | |
| AppArtig e.U. | |
| AppHouseKitchen GmbH | |
| Appingo GmbH | |
| Applied Informatics Software Engineering GmbH | Carinthia |
| Appointmed | |
| arbyte web solutions GmbH | |
| ArCon Software | Salzburg |
| Areeka digital education GmbH | |
| Ariot OG | |
| Arkeon GmbH | |
| Arland Trading GmbH | Styria |
| Ars Electronica Linz GmbH & Co. KG | Upper Austria |
| Artraum | Lower Austria |
| Artware Multimedia GmbH | Vienna |
| ASCHER IT & Automation | Tyrol |
| Aschl Management Systems | Upper Austria |
| ASCUS Telecom GmbH | Carinthia |
| aspern.mobil LAB | |
| Astrocontact Software | Upper Austria |
| Astron Electronic GmbH | Carinthia |
| Astroper e.U. | |
| Atmoky GmbH | |
| Attingo Datenrettung GmbH | Vienna |
| ATVIRTUAL.NET KG | Lower Austria |
| atwork GmbH | Vienna |
| Atwork GmbH | |
| Audio Video Consulting GmbH | Salzburg |
| Audvice GmbH | |
| Auphonic GmbH | |