| AppSalon | |
| Appscore | Victoria |
| AppsForOps Pty Ltd | New South Wales |
| Appsly | |
| Appsquare | New South Wales |
| Apptractive Pty Ltd | New South Wales |
| AppXperts | Tasmania |
| APRG | Queensland |
| Apromore Pty Ltd | Victoria |
| APTUS Cloud Technology | New South Wales |
| Aqua-Gen | |
| Aquarian Technologies | Victoria |
| Aravax | Victoria |
| Arawak | Victoria |
| Arc Business Partners | New South Wales |
| ARC Centre for Excellence in Bioinformatics | Queensland |
| ARC Computers | New South Wales |
| Arcade Product Studio | |
| Arcadian Digital | Victoria |
| Archa Ltd | Victoria |
| Archangel Ventures Pty Ltd | Victoria |
| Archistar Pty Ltd | New South Wales |
| Arctic Intelligence | New South Wales |
| Ardacious Pty Ltd | Queensland |
| Ardeun Biometrics Corporation | New South Wales |
| Ardex Technology | |
| Area9 | |
| ARES | New South Wales |
| Argenica Therapeutics Ltd | |
| Argent | New South Wales |
| Argenti | |
| Argo Investments Ltd | South Australia |
| Argon | |
| Argon Design | South Australia |
| Arising Technology Systems Pty Ltd | Australian Capital Territory |
| Aristocrat Technologies Australia Pty Ltd | New South Wales |
| Arkade | Victoria |
| ARKNET Pty Ltd | |
| ARKPC.com.au | |
| Arlula Pty Ltd | |
| ARN | New South Wales |
| Arq Group Ltd | Victoria |
| Arrayware Pty Ltd | Victoria |
| Arrow Digital | Victoria |
| Arrow Digital | |
| Arrow Networks | New South Wales |
| Arrow Research Corporation | Victoria |
| Art Attack | New South Wales |
| Artbox Pty Ltd | |
| Artesian | |