| Marcus Oldham College | Victoria |
| Margarita Media | |
| Mark Gurry & Associates | Victoria |
| Markar Consulting | Victoria |
| Marken Hosting | Victoria |
| Market Creations Agency | Western Australia |
| Market Ease Digital | |
| Marketeam | Queensland |
| Marketease | South Australia |
| Marketing Bee | New South Wales |
| Marketing Munch Pty Ltd | New South Wales |
| Marketing One Group | Victoria |
| Marketing Sweet | |
| Marketinglab Agency | |
| MarketingResults.com.au | Queensland |
| Markinson | Queensland |
| Marli Technology Solutions Pty Ltd | Victoria |
| Maser Group | New South Wales |
| Mash Media Marketing | New South Wales |
| Masm32 SDK | New South Wales |
| Mass Electronics Pty Ltd | Queensland |
| MasterRemit Pty Ltd | Victoria |
| Matchmaster Communications Pty Ltd | New South Wales |
| MathStat Software | Victoria |
| MatrixThread | Victoria |
| MattaSoft Technology Solutions | Victoria |
| Matter Design Studio | New South Wales |
| Matter Solutions Pty Ltd | Queensland |
| Matter Solutions Pty Ltd | Queensland |
| Matthew King | New South Wales |
| Maverick Mav Pty Ltd | New South Wales |
| Maxamation | New South Wales |
| maxemus Digital Marketing | |
| Maxial | Queensland |
| Maximum Conversions | Queensland |
| Maxinet | New South Wales |
| Maxlence Consulting | Victoria |
| Maxo Telecommunications | Queensland |
| Maxsum Consulting | Victoria |
| Maybray Digital Pty Ltd | Queensland |
| Mayne Pharma Group Ltd | South Australia |
| Mbit Technologies | New South Wales |
| McCauley Software Pty Ltd | New South Wales |
| McGraw Hill Australia | |
| McPherson Scientific Pty Ltd | Victoria |
| McQuillen Interactive Pty Ltd | Tasmania |
| mcrIT | New South Wales |
| ME Bank | Victoria |
| me&u | |
| Mecca Computer Consulting | Victoria |