| London Economic Action Partnership | |
| London Hackspace | |
| London House Exchange Ltd | |
| London International Youth Science Forum | |
| London Kreatives | |
| London Metropolitan University | Greater London |
| London Metropolitan University - School of Computing and Digital Media | Greater London |
| London School of Business & Finance | |
| London School of Economics and Political Science | Greater London |
| London School of Hygiene & Tropical Medicine | |
| London School of Science & Technology | |
| London SEO Masters | |
| London South East Colleges | |
| London Speaker Bureau | |
| London Stock Exchange Group | |
| London Tech Week | |
| London Venture Partners | |
| London Web Bytes | |
| London Web Design Agency | |
| London Web Eye | |
| London Web Factory | Surrey |
| London Website Design | |
| London Website Design Services Ltd | |
| London.ai | |
| Londons Computer Recycling | Greater London |
| Longwall Venture Partners, LLP | |
| LOOK Systems | North Yorkshire |
| Lookhere Solutions Ltd | |
| Lookport Ltd | |
| Loom Digital Ltd | |
| Looming Tech | |
| Loop Digital Marketing Ltd | |
| Loop Scorpio Ltd | Gloucestershire |
| LoopCV | |
| Loopspeed Ltd | |
| LoopWhole Web Design | Suffolk |
| Lopay Ltd | |
| Loqate | Worcestershire |
| Loqbox Technology UK Ltd | Bristol |
| Loquela Ltd | Greater Manchester |
| LoQus23 Therapeutics Ltd | |
| Loreto Sixth Form College | |
| Lorlin Electronics Ltd | West Sussex |
| Lost in I.T. | Hertfordshire |
| Loud Digital Ltd | |
| Loud Mouth Media Ltd | Belfast |
| LoudCrowd | |
| Loughborough College | |
| Loughborough University | Leicestershire |
| Loughborough University - Department of Computer Science | Leicestershire |