| Aculeus Therapeutics Pty Ltd | |
| Acumen Computer Systems Pty Ltd | Victoria |
| Acura Multimedia | Queensland |
| Acutec Systems Pty Ltd | New South Wales |
| ACYTE Biotech | Queensland |
| Ad Impact Advertising | |
| Ad Impact Digital | Western Australia |
| Ad Mission Web | Victoria |
| AdAlta Ltd | Victoria |
| Adapptor | |
| Adaps | |
| ADAPT | |
| Adaptify | Victoria |
| Adaptive Consulting | Victoria |
| Adaptive Media Technologies Pty Ltd | Queensland |
| ADEL SEO | South Australia |
| Adelaide Business Hub | South Australia |
| Adelaide IT Solutions | South Australia |
| Adelaide University - Computer Science & Information Technology | South Australia |
| Adelaide Web Designer | South Australia |
| Adept Business Systems Pty Ltd | New South Wales |
| Adept IT Solutions | |
| Adept Turnkey Pty Ltd | New South Wales |
| Adgile | |
| Adham Dannaway | New South Wales |
| Adigitalife Distribution Pty Ltd | Queensland |
| Adigitalife Pty Ltd | Queensland |
| ADITS | Queensland |
| Adjutor Healthcare Pty Ltd | Victoria |
| ADL Software | Queensland |
| ADMATIC | New South Wales |
| Adnet Technology Australia Pty Ltd | New South Wales |
| AdNews | New South Wales |
| Adobe Australia Pty Ltd | New South Wales |
| Adrenalin | New South Wales |
| Adsee Consulting Pty Ltd | Victoria |
| Adtuna | |
| ADUG | New South Wales |
| Advance Queensland | Queensland |
| Advanced Navigation | New South Wales |
| Advanced User Systems Pty Ltd | New South Wales |
| Advanced Website Designs | |
| AdvanCell Isotopes Pty Ltd | New South Wales |
| Advansys Pty Ltd | New South Wales |
| Advantage Computer Systems | Western Australia |
| Advantage iT | New South Wales |
| Advantech Software | Queensland |
| Adventa Technologies Pty Ltd | |
| Advertron | |
| ADVIS | Victoria |