| Modemsys, S.L. | Madrid |
| mODUSoPERANDI Publicidas, S.L.U. | Valencia |
| Moira Capital Partners | Madrid |
| Moirai Biodesign | Barcelona |
| MOIXÓ, S.L. | Barcelona |
| Mola Factory, S.A. | Balearic Islands |
| Momo Pocket | Granada |
| MomSoft | Madrid |
| MoncaSoft, S.L. | Girona |
| Monei Digital Payments, S.L. | Málaga |
| Monema Communications, S.L. | La Rioja |
| Monolit Projects | Barcelona |
| Monolitic, S.A. | Barcelona |
| Montronic Vic, S.L. | Barcelona |
| Moonback | Madrid |
| MoonSoft | Madrid |
| Morillo Solinfor, S.L. | Sevilla |
| Moss Virtual Sysadmin | Murcia |
| Movilconsulting | Biscay |
| Movistar | |
| MP Electronics | Madrid |
| MPL XR Company | |
| MPM Software | Barcelona |
| MR Factory | Madrid |
| MR Informática | Madrid |
| MSM Asesoría Informática | Madrid |
| Mtcsoft | Granada |
| MTsystem, S.L. | Barcelona |
| Múgica Informática | Navarre |
| Multiverse Computing | Gipuzkoa |
| Mundi Ventures | Madrid |
| MundiLab | |
| MundoIP Servicios Informáticos, S.L. | Barcelona |
| Murielle Aufranc | Madrid |
| Mussara.com | Tarragona |
| Mutter Ventures | Barcelona |
| Muutech Monitoring Solutions, S.L. | Pontevedra |
| MuyComputer | Madrid |
| MuyMac | Madrid |
| MV Informática, S.L. | Madrid |
| mVenturesBcn | Barcelona |
| MWC Barcelona | Barcelona |
| My Digital | Madrid |
| MyChoice2Pay, S.L. | Madrid |
| Myelin VC | |
| MyInvestor | Madrid |
| Mymoid | Madrid |
| Myogem Health Company, S.L. | |
| Myrasoft | Madrid |
| MySaaSPlace, S.L. | Gipuzkoa |