| Mensys | North Holland |
| Mensys B.V. | North Holland |
| Mer | Overijssel |
| Mercash | North Holland |
| Meridia | |
| Merus | |
| Merweb | |
| Mesa Consulting B.V. | South Holland |
| Meskers Web | |
| Mesoline | South Holland |
| Message to the Moon | North Holland |
| MessageBird | North Holland |
| MessingMedia | North Brabant |
| Metabolic | |
| Metaclass | Groningen |
| Metamaze B.V. | |
| MetaMicro Automatisering B.V. | Groningen |
| Metaregistrar B.V. | South Holland |
| Metatags Company B.V. | Friesland |
| Metaverses | South Holland |
| Metaware B.V. | Groningen |
| Metrica Sports | |
| Mezanet Interactieve Media | North Holland |
| MI Consultancy | South Holland |
| Mibo | North Holland |
| Mic-Media | North Brabant |
| Microdesign | South Holland |
| Microfix | South Holland |
| Micros Internetdiensten B.V. | South Holland |
| Microsign | Overijssel |
| Microsmart ICT | |
| Microsoft Netherlands | North Holland |
| Microsoft365.pro | Utrecht |
| MicroStar B.V. | North Holland |
| Microsure | |
| Mighty Consulting Services | South Holland |
| Mihos.net | North Holland |
| MijnHostingPartner.nl | Utrecht |
| Mijnwebserver | Utrecht |
| Mijnwebwinkel | |
| MILabs B.V. | |
| Milestre B.V. | Limburg |
| Million Monkeys | North Holland |
| Mimetas B.V. | |
| Mimir | South Holland |
| Mindscape B.V. | North Holland |
| Mindtime Backup B.V. | Overijssel |
| Mingos | North Holland |
| Minipak Software | Overijssel |
| Minite Works B.V. | |