| Locate Bio Ltd | |
| Location Data Scotland | |
| Location Maps Ltd | Surrey |
| Lococo Creative Ltd | |
| Locomizer | |
| Locowise | |
| Locus Software | |
| LocustWorld | Greater London |
| Lodge Associates | Berkshire |
| Lodge Information Services Ltd | Essex |
| Logan Energy | |
| Logan:IT | |
| Loggable | |
| Logic Design & Consultancy Ltd | Suffolk |
| Logical Biological | |
| Logical Innovations Ltd | Falkirk |
| Logical Microsystems | West Yorkshire |
| Logical Minds | |
| Logicalis Group | Berkshire |
| Logically | |
| Logicart Systems | Surrey |
| Logicearth Learning Services | |
| Logicful | |
| Logicsofts Solutions Ltd | |
| Logicsoftware | Vale of Glamorgan |
| Logidot | |
| Loginet | |
| LoginLlama | |
| Logiweb Internet Services | Northamptonshire |
| LogMeister | North Ayrshire |
| LogNet Systems | Warwickshire |
| Logo Design Ltd | Devon |
| Logo Geek | |
| Logo Zila | |
| Logo2web | |
| Logoinn | |
| Logopro | Ceredigion |
| Logosoft Ltd | |
| Lois Software | |
| Lojix | South Yorkshire |
| LOKE | |
| LOLC Finance plc | |
| Loma Technologies Ltd | |
| Lombard Medical Ltd | |
| London App Developer Ltd | |
| London App Development | |
| London AV Solutions Ltd | |
| London Business School | Greater London |
| London Centre for Nanotechnology | |
| London College of Business | |