| Symmetri Pty Ltd | Victoria |
| Symmetric Design | New South Wales |
| Symmetry Innovations Pty Ltd | Australian Capital Territory |
| Sympact | Tasmania |
| Symphony3 Pty Ltd | Victoria |
| Symsafe | New South Wales |
| Synapse IT Consultants Pty Ltd | Victoria |
| Synchromedia Group | Queensland |
| Syncsoft | Victoria |
| Syndetic Pty Ltd | Queensland |
| Synect Online Solutions | South Australia |
| Synengco Pty Ltd | Queensland |
| Synergy Consulting Australia | South Australia |
| Synergy Group | Victoria |
| SynergyMail | New South Wales |
| Synnex Australia Pty Ltd | Victoria |
| SYNthesis Med Chem | Victoria |
| Sypharma Pty Ltd | Victoria |
| SysCAD | Western Australia |
| SysTalk | Victoria |
| SystemCORP Energy Pty Ltd | Western Australia |
| Systemic Pty Ltd | Western Australia |
| Systems Engineering Society of Australia | Australian Capital Territory |
| Systronic IT Group Pty Ltd | New South Wales |
| T&S Quantum | |
| T4B | Victoria |
| TAA Connect | Queensland |
| Tability Pty Ltd | |
| Tablet PC Pty Ltd | Victoria |
| TAE Aerospace | Queensland |
| Tailored Media | Queensland |
| Tailored Outdoor Media | Queensland |
| Tailored SEO | Tasmania |
| Talcasoft | New South Wales |
| TaleFin | Victoria |
| Talent Nation | Victoria |
| TalentVine | Queensland |
| Talk About Creative | Queensland |
| Talk Digital | Queensland |
| Talking Point Telecommunications | New South Wales |
| Talkscape | Victoria |
| Talman Pty Ltd | New South Wales |
| Talu Ventures | Queensland |
| Tambla | New South Wales |
| Tanda | Queensland |
| Tandem Graphic Design Pty Ltd | South Australia |
| Tang Online Shop | Western Australia |
| Tangent Design | Victoria |
| Tantalus Media | Victoria |
| Tapscape | Western Australia |