| MILLENIUM SEVERAL SERVICE | VALLADOLID |
| MILQUINIENTOS MOTOR | VALLADOLID |
| MILTRESCIENTOSGRAMOS S. COOP | VALLADOLID |
| MILWAUKEE VALLADOLID | VALLADOLID |
| MIMAC | VALLADOLID |
| MIMELA HOSTING | VALLADOLID |
| MIMOSOFA | VALLADOLID |
| MINAS CONSULTORES | VALLADOLID |
| MINCATEC | VALLADOLID |
|
|
| MINERIA HIDROLOGIA Y PROYECTOS | VALLADOLID |
| MINICENTRAL ESPADAÑA | VALLADOLID |
| MINICENTRAL HIDROELECTRICA DE HERREROS | VALLADOLID |
| MINUCA 2000 | VALLADOLID |
| MIRALLOSA | VALLADOLID |
| MIRAMAYA 1940 | VALLADOLID |
| MIRAPOSA 17 | VALLADOLID |
| MIREPREVEN | VALLADOLID |
|
|
| MIRIKAY | VALLADOLID |
| MIRLO FUENTESOL | VALLADOLID |
| MIROZAR | VALLADOLID |
