| mehlau.net | Zurich |
| Melde - und Analysestelle Informationssicherung MELANI | Bern |
| Memo Therapeutics AG | |
| Mémoire Vive | Vaud |
| Menea Menzi Engineering AG | Glarus |
| Mepha Schweiz AG | |
| MesenFlow | |
| Messerli Informatik | Aargau |
| Metaco S.A. | Vaud |
| Metafuels | |
| Metanet AG | Zurich |
| Meteomatics AG | |
| MetP Pharma AG | |
| MetrioPharm AG | |
| Metyis AG | |
| Metzger Capital AG | |
| Mexan GmbH | Lucerne |
| Meyer Burger Technology AG | |
| MFG.LI | Zurich |
| MHS Hamcom GmbH | Bern |
| Michel-Marketing | Aargau |
| Micreos Pharmaceuticals AG | |
| Micro Consulting S.A. | Vaud |
| Micro Crystal AG | Solothurn |
| Micro Systems Technologies Management AG | Zug |
| Microdul AG | Zurich |
| Microsoft Switzerland | Zurich |
| Microswiss Computer Consultants | Zurich |
| Microsynth AG | |
| Microwin AG | Zurich |
| Midrange Dynamics | Zug |
| Migadu-Mail GmbH | |
| Migros Bank AG | Zurich |
| Mikron Holding and Management AG | Bern |
| MindMaze | Vaud |
| MindMaze | |
| Mindnow AG | |
| Minima GmbH | |
| Mirabaud Group | Geneva |
| Miracom AG | Zug |
| Mircea Tudor Scan Tech | |
| Mirko Humbert | Fribourg |
| Mirrakoi | |
| MLSofts | Geneva |
| Mobbot S.A. | Fribourg |
| Mobile Device Solution GmbH | |
| Mobile4Business AG | Bern |
| Mobileman GmbH | Zurich |
| Mobilemonday | |
| Modern Times New Media | Thurgau |