| Lenham.Hand Car Wash Service Ltd | Administrative & support | 2020 |
| Lenvale Group of Companies Limited | Manufacturing | 2016 |
| Lenvale Products Limited | Extraterritorial | 1954 |
| LEO Mini Market Ltd | Wholesale & retail | 2020 |
| Leoline Group Ltd | Construction | 2025 |
| Leon Bartropp Carper Ltd | Information & communication | 2015 |
| Leon Couriers Limited | Transport & logistics | 2022 |
| Leon's Locks Ltd | Other services | 2024 |
| Leona Diagnostics Limited | Health & social care | 2026 |
| Leonard Consultancy Limited | Information & communication | 2013 |
| Leonard Gould & Company Limited | Administrative & support | 1944 |
| Leonard Gould Holdings Limited | Financial services | 2004 |
| Leonard House Limited | Real estate | 2018 |
| Leonard Property MGT Ltd | Real estate | 2022 |
| Leopard Guards Ltd | Construction | 2020 |
| Leritech Ltd | Professional & scientific | 2025 |
| Lesano Ltd | Transport & logistics | 2025 |
| Lesbian, GAY and Bisexual Anti-Violence and Policing Group | Health & social care | 1994 |
| Lesley Jennison Productions Limited | Administrative & support | 2010 |
| LET Angels Ltd | Real estate | 2026 |
| LET Logic Ltd | Real estate | 2025 |
| Let's Evolve Ltd | Professional & scientific | 2023 |
| Lets Dance UK Limited | Education | 1999 |
| Letsco Kent Ltd | Wholesale & retail | 2017 |
| Letterbox Property Management Limited | Real estate | 2023 |
| Letting Links Ltd | Information & communication | 2025 |
| Lettingslux Limited | Real estate | 2019 |
| Letts Wealth Management Limited | Financial services | 2015 |
| Levante Dives Limited | Real estate | 2023 |
| Level Partnership Limited | Information & communication | 2007 |
| LEVELLOVERS13 Ltd | Arts & recreation | 2024 |
| Leviathan Design Ltd | Information & communication | 2009 |
| Levick Services Ltd | Construction | 2015 |
| Levilink Ltd | Transport & logistics | 2025 |
| Levon Solution Ltd | Construction | 2024 |
| Lewin Bakers Ltd | Hospitality | 2024 |
| Lewin Surface Solutions Ltd | Administrative & support | 2026 |
| Lewins Surface Solutions Limited | Administrative & support | 2026 |
| Lewis Mckenna Limited | Extraterritorial | 2016 |
| Lewis Roofing Contractors Ltd | Construction | 2010 |
| Lewis Wellness Limited | Health & social care | 2019 |
| LEX Packaging Ltd | Manufacturing | 2024 |
| Lexicon Homes Limited | Real estate | 2015 |
| Lexo Group Ltd | Education | 2026 |
| Lexxi Limited | Wholesale & retail | 2023 |
| Lexy K Limited | Transport & logistics | 2026 |
| Leybourne Investments Ltd | Construction | 2022 |
| Leybourne Lakes Management Limited | Households | 2001 |
| Leybrad Investments Limited | Real estate | 1979 |
| Leyton Homes (Perry Barr) Ltd | Real estate | 2015 |
| LFA Trans Ltd | Transport & logistics | 2024 |
| Lftt Limited | Health & social care | 2022 |
| LG A*Nalytics Ltd. | Information & communication | 2018 |
| LG GP Services Ltd | Health & social care | 2014 |
| LG Land and Homes Limited | Real estate | 2024 |
| LG Southern Limited | Administrative & support | 2025 |
| LGA Products Ltd | Wholesale & retail | 2025 |
| LGC Fire Protection Ltd | Construction | 2025 |
| LGG Trans Ltd | Transport & logistics | 2021 |
| LGW Autos Ltd | Wholesale & retail | 2025 |
| LGX Ltd | Extraterritorial | 2001 |
| LH Law Limited | Professional & scientific | 2019 |
| Libertas Consultants Ltd | Professional & scientific | 2021 |
| Liberty Land & Property Ltd | Real estate | 2023 |
| Liberty QS Holdings Limited | Professional & scientific | 2018 |
| Liberty QS Limited | Professional & scientific | 2014 |
| Libre Vehicles Ltd | Wholesale & retail | 2024 |
| Lick 'N' Stick Limited | Transport & logistics | 2006 |
| Licoe Web Design Studio Ltd | Information & communication | 2021 |
| Liedetectors Ltd | Professional & scientific | 2014 |
| Life on Time Ltd | Education | 2019 |
| Lifestyle Kitchens (Kent) Ltd | Construction | 2022 |
| Lifetime Implant Ltd | Health & social care | 2018 |
| Lift Compliance Limited | Manufacturing | 2023 |
| Liftyfive Private Limited | Wholesale & retail | 2025 |
| Light Symphony Ltd | Wholesale & retail | 2023 |
| Light UP Innovation Networks Ltd | Wholesale & retail | 2012 |
| Lightbulb Collective Limited | Wholesale & retail | 2025 |
| Lighten the Load Sleep Consultancy Ltd | Information & communication | 2025 |
| Lightglow Limited | Professional & scientific | 2015 |
| Lightning Express Limited | Transport & logistics | 2025 |
| Lightwing Marketing Limited | Wholesale & retail | 2016 |
| Lilham Aviation Ltd | Transport & logistics | 2023 |
| Lilian Associates Ltd | Administrative & support | 2014 |
| Lillybett Merchandise Limited | Wholesale & retail | 2025 |
| Lily Rose Fabrications Limited | Other services | 2023 |
| Lilymoo Limited | Real estate | 2017 |
| LIM Express Ltd | Transport & logistics | 2023 |
| Lime Licht Limited | Construction | 2023 |
| Lime the Communication Works Limited | Professional & scientific | 2002 |
| Limes House Property Limited | Households | 2024 |
| Limetree Products Ltd | Information & communication | 2002 |
| Limited by Invitation Limited | Information & communication | 2012 |
| Limitless Forex Academy Ltd | Education | 2021 |
| Limonade Ltd | Manufacturing | 2025 |
| Lincoln West Limited | Administrative & support | 2005 |
| Lind Childsense Limited | Manufacturing | 2026 |
| Linda's Florist Limited | Wholesale & retail | 2002 |
| Lindetrans Ltd | Extraterritorial | 2022 |
| Lindsay Holdings Limited | Health & social care | 2026 |