| Leave Dates | |
| LED Studio | |
| Lee Lawton | |
| Leeboothroyd | West Yorkshire |
| Leeds Apps | |
| Leeds Arts University | |
| Leeds Beckett University | West Yorkshire |
| Leeds City College | |
| Leeds Trinity University | |
| Leeming Design | Merseyside |
| LeenTech | |
| Lef Circuits Ltd | Leicestershire |
| Legal Geek | |
| Legal Nodes Ltd | |
| Legal Software Solutions Ltd | Perth and Kinross |
| Legal Software Suppliers Association | Lincolnshire |
| Legalesign Ltd | |
| Legalfly | |
| Legend | |
| Legis Solutions | |
| Legislate Technologies Ltd | |
| Legl | Greater London |
| Leicester Website | |
| Leighton Corporation | Tyne and Wear |
| LeisureMost | West Yorkshire |
| Lektropacks | Surrey |
| Lemon Computing Ltd | Hampshire |
| Lemon Media Ltd | Somerset |
| Lemonade Finance | |
| LemonEdge | |
| Lemoneye Ltd | East Sussex |
| Lemongrass Media | Hertfordshire |
| Lendable Ltd | |
| Lendscape Ltd | Greater London |
| Lennon Design | |
| Lens Digital | |
| Lentitek Ltd | |
| Leo Cancer Care | |
| Leon | |
| Leopard Business Solutions | |
| Leopard Lync | |
| LeoTel Software Systems Ltd | Hertfordshire |
| Leotronics Ltd | Hampshire |
| Les Wallen Manufacturing Ltd | Kent |
| Lestac Services Ltd | Berkshire |
| Let's Foodie | |
| Leucid Bio Ltd | |
| Leumi UK | |
| Level 39 | |
| Level 7 Systems Ltd | |