| Artrya | Western Australia |
| ASC Software | Western Australia |
| Ascend Business Technology | Western Australia |
| Ascendancy | New South Wales |
| Ascender HCM Pty Ltd | New South Wales |
| Ascension Cloud Solutions | |
| ASD Technology Pty Ltd | New South Wales |
| ASG Group | Western Australia |
| Ashley Rodan | |
| 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 |
| ASPWebHosting.com.au | Queensland |
| Asquick IT | Queensland |
| Assembler Digital | Western Australia |
| Asseti Operations Pty Ltd | |
| Assigment Hero | |
| AssignmentHero | |
| Associated Computer Solutions Pty Ltd | New South Wales |
| Assure Digital | |
| AST Solutions | Victoria |
| Asta Solutions Pty Ltd | Victoria |
| Astapor Technologies | |
| Aster Australia | Victoria |
| Aston Digital | |
| Aston Social Pty Ltd | Victoria |
| Astral Media | |
| Astro Telecoms | New South Wales |
| Astute Payroll | Victoria |
| Astute Theory | |
| ASVIC | Queensland |
| ASX | |
| AT Digital | |
| AT+M Marketing | |
| Atac | Queensland |
| Atcomm Enterprises Pty Ltd | Victoria |
| AtCor Medical | New South Wales |
| aTeam Soft Solutions | Queensland |
| ATEC | |
| ATech Services Pty Ltd | Queensland |
| Ategra Pty Ltd | |
| Athena Home Loans | |
| Atlas Digital Agency | New South Wales |