| Minty Cloud Ltd | |
| Minty Studios Ltd | |
| MINUS40 | |
| MIP Discovery Ltd | |
| MIRACL | |
| Miracle Dynamic Solutions Ltd | Greater Manchester |
| Mirador Analytics Ltd | |
| Miragetek Global Resources Ltd | Greater London |
| Miramedia Ltd | |
| Miroma Ventures Ltd | Greater London |
| Miromedia Ltd | Warwickshire |
| Mironid | |
| Miros | |
| Mirriad Advertising plc | |
| MIS Computer Services | Cheshire |
| MIS Web Design | South Yorkshire |
| MishiPay Ltd | |
| Missing Pot | |
| Mission Therapeutics | |
| Mission Ventures Ltd | |
| Mission Zero | |
| Mistera Ltd | Hampshire |
| MIT Dynamic Technologies Ltd | Oxfordshire |
| Mitchell Edwards Ltd | |
| Mitchells Online Computer Services | Surrey |
| Miton Systems Ltd | Hertfordshire |
| MitoRx Therapeutics Ltd | |
| Mitra Innovation | |
| Mitra Marketing Services, LLP | Shropshire |
| Mitrefinch | North Yorkshire |
| Mixed Signal Systems Ltd | |
| Mixertech Ltd | |
| MixIr Ltd | |
| MJ Security Systems Ltd | |
| MJ Software Solutions Ltd | Newport |
| MJM Computers & Consumables | Vale of Glamorgan |
| MJMSoft Design Ltd | Edinburgh |
| MJS Fibre & Data Cable Installations | Nottinghamshire |
| MJS IT Services Ltd | Worcestershire |
| MJS Website Design | Hampshire |
| MJT Net Ltd | |
| MK SEO | |
| MK Web | |
| MK WebGuru | |
| MKAI International Ltd | |
| mkodo Ltd | |
| MKT Computers Brokers Ltd | |
| MLabs Ltd | |
| MLL Telecom | Buckinghamshire |
| MLR Networking Ltd | Berkshire |