| Moof IT | |
| Moonfare GmbH | Greater London |
| Moonfire Ventures, LLP | |
| Moonfive | |
| MoonPod | South Yorkshire |
| Moonshot Partners | |
| Moonwalk | |
| Moore-Wilson Ltd | |
| Moosend | |
| Moot | |
| Mootral | Blaenau Gwent |
| Moove Agency Ltd | |
| Mopapp | |
| Moqod | |
| Mor Consulting | |
| Mor-Tech Computing Services Ltd | |
| Moranlord Ltd | West Sussex |
| More Click Marketing Ltd | Glasgow |
| Moredun Foundation | |
| MoreNiche | Nottinghamshire |
| MoreSoda Design Ltd | Somerset |
| Morgan Advanced Materials | |
| Morgan Computers | Somerset |
| Morgan Web | Carmarthenshire |
| Morning Data Ltd | Dorset |
| Morning Glass Media | |
| MorningPages | |
| morphsites Ltd | Somerset |
| Morrow Ltd | |
| Morvus Technology | |
| Mosaic App Ltd | |
| Mosaic Digital Media | |
| Mosaic Online Systems Ltd | |
| Mosaic Smart Data | |
| Mosaic Software Ltd | South Lanarkshire |
| Mosaic Therapeutics | |
| Mosquito Digital Ltd | |
| Motasoft | |
| Mother Technologies | |
| Motion 12 Ltd | |
| Motion Impossible Ltd | |
| Motion Software Ltd | Aberdeen |
| Motor Data Solutions Ltd | |
| Motorway Buddy | |
| Mott MacDonald | |
| Moulded Cords and Cables Ltd | Berkshire |
| Mountain Stream Ltd | |
| MountDigital | |
| Mountside Ventures | |
| Mousetrap Media | East Sussex |