| iRealty | Queensland |
| Ireckon Pty Ltd | Queensland |
| IREN | |
| Iress | Victoria |
| Iress | Victoria |
| Ironbark Software | Queensland |
| IRT Electronics Pty Ltd | New South Wales |
| ISA Technologies | Western Australia |
| Isentia | New South Wales |
| ISI Australia | New South Wales |
| Island Pharmaceuticals | Victoria |
| iSmart Software | Queensland |
| iSoft Design | Victoria |
| iSolutions International Pty Ltd | Queensland |
| iSolutions Technology | Western Australia |
| Isoton | South Australia |
| IT Call out | Western Australia |
| IT Company Pty Ltd | New South Wales |
| IT Easy | New South Wales |
| IT Focused Solutions | New South Wales |
| IT House Pty Ltd | Western Australia |
| IT Leaders Group | Queensland |
| IT Magnet Pty Ltd | New South Wales |
| IT Masters Pty Ltd | Queensland |
| IT Next Generation | New South Wales |
| IT Support Brisbane | Queensland |
| IT Switch | Victoria |
| IT System Solutions Pty Ltd | Victoria |
| IT Ventures Pty Ltd | |
| IT Vision Australia | Western Australia |
| IT West Holdings Pty Ltd | Western Australia |
| iTag | New South Wales |
| ITC Co Pty Ltd | |
| ITCC | Victoria |
| ITIC Sydney | New South Wales |
| ITL Biomedical | Australian Capital Territory |
| iTnews | New South Wales |
| Itomic Web App Design Development | Victoria |
| ITSwitch Pty Ltd | Victoria |
| ITTECH Pty Ltd | New South Wales |
| ITtelligent Consulting Services | Victoria |
| ITUC Today | Western Australia |
| Iugo | South Australia |
| Jaaims Australia Pty Ltd | New South Wales |
| Jack Marlow | Victoria |
| Jadu Ltd | Australian Capital Territory |
| Jaffa Designs | Queensland |
| Jago Digital | |
| Jala Design | New South Wales |
| Jam Jar | Victoria |