| Media Reach Group |
| Mediareach Star Limited |
| Meganexus Ltd |
| Megawra |
| Melitta Group |
| Mentor Hub Innovation, Mas Uliyati Cheklangan Jamiyati |
| Mercedes-Benz Group AG |
| Merck & Co., Inc |
| Mercurio Gestao Producoes e Acoes Colaborativas Ltda |
| Mercury Research SRL |
| Mercy Corps |
| Met Foods Limited |
| Meta Media Holding Limited |
| METCON Group Private Ltd |
| Method Products Inc |
| Metro Athleisure Limited (old name Cravatex Limited) |
| Metro Bank Plc |
| MFM Holding Ltd |
| Micron Technology Inc |
| Microsoft Corporation |
| Middlesex University |
| Midsona |
| Midwest Tapes LLC |
| Miele family & Zinkann family |
| Mindshare |