| AIS Technolabs | |
| AJAXWorkspace | Western Australia |
| AK Marketing | |
| Akaal Pharma Pty Ltd | |
| Akaysha Energy | |
| Akips | |
| Akra Web | New South Wales |
| AKS Digital | South Australia |
| Aktiv Digital | Victoria |
| Albury Local Internet | New South Wales |
| Albury Web Design | New South Wales |
| Alchemy Technology | |
| Alectro Pty Ltd | New South Wales |
| Aleis Pty Ltd | Queensland |
| Alembic Pty Ltd | |
| Aleph IT Pty Ltd | |
| Alexa Digital | Victoria |
| Algomint | Queensland |
| Algorae Pharmaceuticals Ltd | |
| Alien Intelligence | |
| Alinga Web Media Design Pty Ltd | |
| Alink247 | Victoria |
| Aliquot Solutions | |
| Alkye Services Pty Ltd | |
| All I.T. Solutions Pty Ltd | Australian Capital Territory |
| All IT Services | |
| All Marketing | |
| Allegra Medical Technologies | |
| Allens | |
| Alliance Business Technologies | Queensland |
| Alliance Networks Support | Victoria |
| Alliance SI | New South Wales |
| Alliance Software | Victoria |
| Allied Data Systems Pty Ltd | New South Wales |
| Allied Projects | |
| Alloy Computer Products Australia Pty Ltd | Victoria |
| Allpos | Western Australia |
| Alltraders Pty Ltd | South Australia |
| Allume Energy Pty Ltd | |
| Aloomic | |
| Alpha Digital | Queensland |
| Alpha Finance | |
| Alpha Fintech (Australia) Pty Ltd | Victoria |
| Alpha Station | Victoria |
| Alphacrucis University College Ltd | |
| Alphastation Group Pty Ltd | Victoria |
| Alphasys Pty Ltd | New South Wales |
| AlphaWallet Pty Ltd | New South Wales |
| Alphawhale | |
| ALPS I.T. | |