| M3 Systems | |
| M3S | Yvelines |
| M3soft | Savoie |
| M@ Solution | Calvados |
| Maarch | Hauts-de-Seine |
| MaaT Pharma | |
| Maatel | Isère |
| Mablink Bioscience | |
| MAbQi | |
| Mac Expert | Hérault |
| Mac OS Assistance | Val-de-Marne |
| MacGénération | Métropole de Lyon |
| MACH Scanners et Solutions | Gironde |
| Mach2Com | Pyrénées-Atlantiques |
| Macopharma | |
| Macross Informatique | Métropole de Lyon |
| Macymed | Vaucluse |
| Madagence | |
| Madbox | |
| Maddyness | Hauts-de-Seine |
| MadeCELL | |
| MaDICS | |
| Mado XR | |
| Madsoft | Essonne |
| Maecia | Paris |
| Mafisys | Yvelines |
| MaForet.net | Yvelines |
| Mageia | Paris |
| Mageia Linux-Online | Paris |
| Magellan | Métropole de Lyon |
| Magellan Consulting | |
| Magellan-AW | |
| Magentix | Nord |
| Magic Instinct Software | Loire-Atlantique |
| Magic Makers | |
| Magic Online | Seine-Saint-Denis |
| Magina | |
| Magma Technology | |
| Magnum Telecom | Isère |
| MAIF Avenir | |
| MailClark | Métropole de Lyon |
| MailinBlack | Bouches-du-Rhône |
| Mailing Builder | Nord |
| Mailing builder pro | Nord |
| Mailjet | |
| Mailo | |
| Mainbot | |
| Maintenance Informatique Auray | Morbihan |
| Maintenance Informatique et réseaux | Haute-Garonne |
| Maintronic | Hauts-de-Seine |