| ARN | New South Wales |
| Arovella Therapeutics | Victoria |
| Arq Group Ltd | Victoria |
| Arrayware Pty Ltd | Victoria |
| Arrow Digital | Victoria |
| Arrow Networks | New South Wales |
| Arrow Research Corporation | Victoria |
| Art Attack | New South Wales |
| Artesian | |
| Artrya | Western Australia |
| ASC Software | Western Australia |
| Ascend Business Technology | Western Australia |
| Ascendancy | New South Wales |
| Ascender HCM Pty Ltd | New South Wales |
| ASD Technology Pty Ltd | New South Wales |
| ASG Group | Western Australia |
| Ashop Pty Ltd | |
| ASI Solutions | New South Wales |
| Asia Pacific International College Pty Ltd | |
| Asia Pacific IT Ltd | New South Wales |
| Asia Principal Capital | New South Wales |
| Asialink Business | Victoria |
| Asken | Queensland |
| ASP Microcomputers | Victoria |
| Aspedia | Queensland |
| Aspose Pty Ltd | New South Wales |
| Aspose Pty Ltd | |
| ASPWebHosting.com.au | Queensland |
| Asquick IT | Queensland |
| Assembler Digital | Western Australia |
| Associated Computer Solutions Pty Ltd | New South Wales |
| AST Solutions | Victoria |
| Asta Solutions Pty Ltd | Victoria |
| Aster Australia | Victoria |
| Aston Social Pty Ltd | Victoria |
| Astro Telecoms | New South Wales |
| Astute Payroll | Victoria |
| ASVIC | Queensland |
| Atac | Queensland |
| Atcomm Enterprises Pty Ltd | Victoria |
| AtCor Medical | New South Wales |
| aTeam Soft Solutions | Queensland |
| ATech Services Pty Ltd | Queensland |
| Ategra Pty Ltd | Northern Territory |
| Athena Home Loans | |
| Atlas Digital Agency | New South Wales |
| Atlasopen | |
| Atlassian | New South Wales |
| Atmail | New South Wales |
| Atomic Digital Marketing | New South Wales |