| Microtron | Antwerp |
| miDiagnostics | |
| Milky Web | Flemish Brabant |
| Mind | Flemish Brabant |
| MindBytes | |
| Mintt | |
| Minze Health | |
| Miracor Medical S.A. | |
| Miredot | |
| Mission Systole | |
| Mission to Mars | |
| Mister Genius S.A. | Brussels-Capital |
| MIT-S Service Informatique | Walloon Brabant |
| Mithra Pharmaceuticals | Liège |
| Mixity Prompt IT Services | Walloon Brabant |
| MMi Solution S.R.L. | |
| Mms-Solutions | |
| Mobietrain | |
| MobileXpense | Brussels-Capital |
| Mobitel B.V. | |
| Mobito Technology SRL | |
| Mondialtelecom | |
| Moneytrans | |
| Monimmo | |
| MonkeyProof | East Flanders |
| Mono Company B.V. | East Flanders |
| MonSiteAMoi | Hainaut |
| Montis Biosciences | |
| Moonbeetle | Antwerp |
| Moovly | |
| Moro Tech | |
| morphemZero | Namur |
| moveUP | |
| Movify S.R.L. / B.V. | |
| Movu Robotics | |
| Mpleo | |
| MRM Health N.V. | |
| MRSolutions.be | Limburg |
| Multi-OS Informatica S.A. | Hainaut |
| Multicap | Antwerp |
| MVconcepts | |
| MyCellHub | |
| Myconsultation.be | |
| MyData-TRUST | |
| myNEO | |
| myNEO | |
| MyOwn S.R.L. | Brussels-Capital |
| N-Side | |
| Nakatomi | Liège |
| Namahn | Brussels-Capital |