| Metaverse News | Barcelona |
| Metaverso360.io | Sevilla |
| Metech | Madrid |
| Methinks | Barcelona |
| Metriplica | Barcelona |
| Metxa Aceleradora de Proyectos, S.L. | Álava |
| Meytel | Madrid |
| MG Comunicación, S.L. | Madrid |
| Micappital | Madrid |
| Mick Graham Computers | Valencia |
| Microarea, Inc. | Valencia |
| Microasis, S.L. | Biscay |
| MicroBR Comunicaciones, S.A. | Barcelona |
| MicroCAD | Málaga |
| Microcom Sistemas Modulares, S.L. | Gipuzkoa |
| Microfusa, S.L. | Barcelona |
| Microgal, S.L. | Pontevedra |
| Microjogos.com | Barcelona |
| Micrològic, S.L.U. | Girona |
| Micromedia, S.L. | A Coruña |
| Micronet, S.A. | Madrid |
| Microsa | Sevilla |
| MicrosShop Tiendas, S.L. | Valencia |
| Microviable Therapeutics, S.L. | Asturias |
| MicruX Fluidic, S.L. | Asturias |
| Milenium System Soluciones, S.L. | Zaragoza |
| Millenium Soft | Madrid |
| Mimark | |
| Mind Your Gap Studio, S.L. | Barcelona |
| Minerva Hosting, S.L.U. | Madrid |
| Minicoders21, S.L. | Barcelona |
| Miniprice Express | A Coruña |
| Minoryx | Barcelona |
| Mio Consulting Inteligencia de Negocio, S.L.U. | Madrid |
| MiPc OK | Murcia |
| Miru Studio VR, S.L. | Gipuzkoa |
| Mitae | Biscay |
| Mitiga Solutions | Barcelona |
| MiTSoftware.com | Alicante |
| Miura Partners | Barcelona |
| Miweb | Barcelona |
| mjn-neuro | Girona |
| MKS Work Together, S.L. | Madrid |
| Mobbeel | Cáceres |
| Mobile One2One | Madrid |
| Mobile World Capital | Barcelona |
| Mobilers | Madrid |
| Mobincube | |
| Mobivery | Sevilla |
| Modelos Informáticos, S.L. | Valencia |