| Name | Region |
|---|---|
| Luminet Solutions Ltd | |
| Luminos Software | |
| Luminous Ventures Ltd | |
| Lumio Technologies Ltd | |
| Lumon | |
| Lumpy Lemon Ltd | Devon |
| Luna Pets | |
| Lunamedia | |
| Lunar Works | |
| Lunaria Ltd | Edinburgh |
| Lunatix | |
| Lunio | |
| Luno | |
| Lupovis | |
| Luscid | |
| Lush New Media | Hampshire |
| Luther Systems | |
| Lutra Consulting | |
| Luup International Ltd | Staffordshire |
| Luvia Digital Ltd | |
| Luxbranding | |
| Luxeo | |
| Luxrite Ltd | Hertfordshire |
| Luxson Ltd | |
| LV Media Ltd | Greater Manchester |
| LVT Capital | |
| Lyca Group | |
| Lynchpin Analytics Ltd | Edinburgh |
| Lynmar Solutions Ltd | Essex |
| Lynq Ltd | Hampshire |
| Lynton Black Media | Cardiff |
| Lynx 19 Ltd | Lincolnshire |
| Lynx Networks | Buckinghamshire |
| Lynx Networks – Cabling Division | Hampshire |
| Lyquidity Solutions Ltd | |
| Lyst | Greater London |
| Lyx Street Ltd | |
| M & R Systems | Nottinghamshire |
| M Squared Lasers Ltd | |
| M&J Communications Ltd | |
| M&M Information Technologies | Staffordshire |
| M+A Partners | |
| M-Flow Technologies Ltd | |
| m-hance | |
| M-Tech Systems Ltd | |
| M.A.S.S. Computers | |
| M2 Computer Services | |
| M2 Computing | West Sussex |
| M21 | Warwickshire |
| M247 Ltd | Greater Manchester |