| Metricus Pty Ltd | New South Wales |
| Metro Software Developments | Victoria |
| Metropolis Agency Pty Ltd | New South Wales |
| MI Academy | Victoria |
| Micro Response | Victoria |
| Microba Life Sciences | Queensland |
| MicroChannel Services | New South Wales |
| Microelectronic Technologies | Queensland |
| Micron21 Pty Ltd | Victoria |
| MicroRentals | New South Wales |
| Microsoft Australia | New South Wales |
| Microtrade | Victoria |
| MicroWay | Victoria |
| Midcoast | New South Wales |
| MIE Software | Victoria |
| Mil-Spec Australia Pty Ltd | Queensland |
| Milc Studio | New South Wales |
| Mildura Internet Website Design | Victoria |
| Million Hits | |
| Millpost Technologies | Australian Capital Territory |
| Mills Web Design | New South Wales |
| Milnsbridge | New South Wales |
| Mimotopes | Victoria |
| Mindflux | New South Wales |
| Mindscape Asia Pacific Pty Ltd | New South Wales |
| MindVision Interactive | South Australia |
| Mine Digital | Queensland |
| Minemax | Western Australia |
| Minfos | Victoria |
| Mini Digital | Western Australia |
| Mini-Kits | South Australia |
| Minit IT | New South Wales |
| Mint Payments Ltd | New South Wales |
| Mintec Systems | Victoria |
| MIP | New South Wales |
| MIR-AUS Pty Ltd | New South Wales |
| Mirrasoft Pty Ltd | Victoria |
| missiveMEDIA | Australian Capital Territory |
| MIT Services | Australian Capital Territory |
| Mitchell and Brown Communications | Western Australia |
| Mitrade | Victoria |
| Mitrefinch (Aust) Pty Ltd | New South Wales |
| Mixo | New South Wales |
| MJ Freelancing | New South Wales |
| MJH Group Pty Ltd | Victoria |
| MJWebs Pty Ltd | New South Wales |
| MKTPlace Ventures Pty Ltd | Victoria |
| MMR Studio | Victoria |
| Mobiddiction | New South Wales |
| Mobile Digital | Queensland |