| Myerscough College | |
| MyFirmsApp | |
| MyMemory Ltd | Channel Islands |
| MyOxygen | |
| MyOxygen Ltd | |
| MyPCBackup.com | Hampshire |
| MyPcHelpdesk | Hampshire |
| Myrddin Design | Carmarthenshire |
| Myriad Digital | Devon |
| Myricx Bio | Greater London |
| MySense | |
| Mysphere Infotech UK Ltd | |
| Myth Digital Ltd | |
| Mythic Software Ltd | |
| Mythicsoft Ltd | Cambridgeshire |
| Mytos | |
| MyTrendyPhone e-Store | Suffolk |
| MyTutorWeb Ltd | |
| myWebHero | |
| n 2 Networks Ltd | Devon |
| n.able technology services | |
| N0BS Agency Ltd | |
| N2N Solutions Ltd | Hampshire |
| N4 Pharma plc | |
| n7 Studios Ltd | |
| Nabu IT Solutions | |
| Nacue UK Ltd | Greater London |
| NadVertex Digital Solutions | |
| Nagne Ltd | Edinburgh |
| Naked Objects Group Ltd | |
| NALO Solutions Ltd | |
| Name Droper | Surrey |
| names.co.uk | Worcestershire |
| Nandini Consulting Ltd | |
| Nanodome Ltd | Greater London |
| Nanogenics Ltd | |
| Nanomerics Ltd | |
| Nanoptima Ltd | |
| NanoSyrinx Ltd | |
| nanoTherics Ltd | |
| Nanovery | |
| Napier Technologies Ltd | |
| Napoleon Creative | |
| Napp Pharmaceuticals Ltd | |
| Naq Cyber UK Ltd | |
| Narakeet | |
| Narusson Digital Marketing | |
| Narwhal Media Group Ltd | |
| NashTech | |
| NASoftware Ltd | Greater Manchester |