| Ace Web Design Adelaide | South Australia |
| Acidgreen | New South Wales |
| ACK IT Services Pty Ltd | New South Wales |
| Across Technology | Victoria |
| Acrotec Pty Ltd | New South Wales |
| Acrux | Victoria |
| ACS Distance Education | Queensland |
| ACS Distance Education - Information Technology Courses | Queensland |
| ACT Apple Users Group | Australian Capital Territory |
| ACT Education and Training Pty Ltd | Western Australia |
| ACT Government Open Data Portal | Australian Capital Territory |
| Act Today | New South Wales |
| Actinogen Medical | New South Wales |
| Action Websites | Victoria |
| Activa Pty Ltd | New South Wales |
| ActivePipe Group Pty Ltd | Victoria |
| Actual Size | Victoria |
| 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 |
| 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 Web Designer | South Australia |
| Adept Business Systems Pty Ltd | New South Wales |
| Adept Turnkey Pty Ltd | New South Wales |
| 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 | Victoria |
| Adrenalin | New South Wales |
| Adsee Consulting Pty Ltd | Victoria |
| ADUG | New South Wales |
| Advance Queensland | Queensland |