| Leighway Maintenance Solutions Limited | Construction | 2013 |
| Leighway Plant Hire LLP | | 2015 |
| Leinster Square Estates Ltd | Real estate | 2024 |
| Leisure CP Limited | Hospitality | 2023 |
| Leisure Inn Hotel Ltd | Hospitality | 2013 |
| Lejeune Security Solutions Limited | Administrative & support | 2023 |
| Lelong Investments Ltd | Financial services | 2020 |
| LEM Building Limited | Construction | 2020 |
| Lemar Foods Ltd | Wholesale & retail | 2020 |
| Leminext Global Ltd | Wholesale & retail | 2023 |
| Lemon Advisors UK Limited | Information & communication | 2012 |
| Lemon Appeal Ltd | Manufacturing | 2024 |
| Lemon Grove Films Limited | Information & communication | 2024 |
| Lemon Quarters Media Limited | Information & communication | 2018 |
| Lemon Quarters Squared Limited | Administrative & support | 2023 |
| Lemon Tree Financial Ltd | Financial services | 2019 |
| Lemons & Sevens Ltd. | Education | 2025 |
| LEN Beaman (ST Helens) Holdings Ltd | Professional & scientific | 2018 |
| LEN Beaman (ST Helens) Ltd | Construction | 2018 |
| Lenay Investments Ltd | Financial services | 2019 |
| Lending Platform Limited | Financial services | 2015 |
| Lendverse Ltd | Information & communication | 2025 |
| Lenette-Gelvez Ltd | Health & social care | 2022 |
| Lenira Health Ltd | Health & social care | 2025 |
| Lenix Solutions Limited | Information & communication | 2015 |
| Lenmae Holdings Limited | Financial services | 2025 |
| Lenny FOX Limited | Health & social care | 2018 |
| Lenora Jewellery Ltd | Wholesale & retail | 2026 |
| LEO Developments (UK) Limited | Real estate | 2007 |
| LEO Jones Investments Limited | Real estate | 2022 |
| LEO Mandella Limited | Other services | 2019 |
| LEO Metal Works Limited | Manufacturing | 2024 |
| LEO Solutions PVT Ltd | Transport & logistics | 2026 |
| Leofxz Creative Services Ltd | Professional & scientific | 2026 |
| Leon City Builders Ltd | Construction | 2019 |
| Leon Morocki Consulting Limited | Information & communication | 2012 |
| Leon the PIG Farmer Limited | Arts & recreation | 1992 |
| Leon TPF Nominees Limited | Extraterritorial | 2014 |
| Leonard Castle Studios Ltd | Real estate | 2024 |
| Leonie Grace Limited | Health & social care | 2024 |
| Leopard Care Ltd | Wholesale & retail | 2021 |
| Leopard Communications International Ltd | Information & communication | 2010 |
| Leora - Timeless Beauty Limited | Wholesale & retail | 2024 |
| Leora Software Services Ltd | Information & communication | 2011 |
| Leoreg Ltd | Hospitality | 2022 |
| Leosces Ltd | Households | 2017 |
| Leotaur Group Limited | Financial services | 2025 |
| Leotaur Limited | Financial services | 2019 |
| Leotax Limited | Professional & scientific | 2023 |
| Lepard Ltd | Professional & scientific | 2025 |
| Lepotica International Ltd | Manufacturing | 2024 |
| Lerion Ltd | Construction | 2022 |
| LES Carpentry Ltd | Manufacturing | 2025 |
| LES Giraffes Limited | Construction | 2015 |
| Lesin Limited | Hospitality | 2025 |
| Leslie Park Road Ltd | Real estate | 2020 |
| Lesnoll Limited | Administrative & support | 1978 |
| Lesser Associates Limited | Professional & scientific | 2006 |
| Lestine Limited | Real estate | 1977 |
| LET & Rent Ltd | Real estate | 2021 |
| LET ME PAY Monthly Ltd | Wholesale & retail | 2018 |
| LET Them Play Ltd | Education | 2025 |
| Lets Dream Ltd | Real estate | 2003 |
| Lets Maintain Limited | Construction | 2023 |
| Lets Match Limited | Real estate | 2010 |
| Letsea Limited | Education | 2023 |
| Letsgetlean Limited | Arts & recreation | 2020 |
| Letspassfast Limited | Education | 2006 |
| Letting Guys Ltd | Real estate | 2013 |
| Letting One Ltd | Real estate | 2011 |
| Lettuce EAT Ltd | Extraterritorial | 2018 |
| Lettuce Inn Ltd | Wholesale & retail | 2011 |
| Levelgreen Limited | Professional & scientific | 1997 |
| Levelpeak Limited | Wholesale & retail | 1986 |
| Levelup 4LIFE Nutrition Limited | Wholesale & retail | 2026 |
| Levelview Limited | Real estate | 2015 |
| Levi's Developments Ltd | Construction | 2019 |
| Levis Stone Ltd | Construction | 2023 |
| Levismar Capital Ltd | Real estate | 2019 |
| Levismar Formwork and Groundworks Ltd | Construction | 2013 |
| Levismar Plant Hire Ltd | Construction | 2022 |
| Levy Gorvy Limited | Arts & recreation | 2016 |
| Lewisham Gateway (Plot A&B) Management Company Limited | Construction | 2014 |
| Lewisham Gateway Estate Management Company Limited | Construction | 2014 |
| LEX Homes Capital Limited | Financial services | 2018 |
| Lexall Construction Limited | Construction | 2024 |
| Lexco Solutions Limited | Professional & scientific | 2015 |
| Lexi Ralph Ltd | Construction | 2016 |
| Lexigen Limited | Professional & scientific | 2009 |
| Lexo Blue Ltd | Wholesale & retail | 2014 |
| Lexo Orange Ltd | Wholesale & retail | 2014 |
| Lexo Purple Ltd | Wholesale & retail | 2014 |
| Lexo Red Ltd | Wholesale & retail | 2014 |
| Lexo Yellow Ltd | Wholesale & retail | 2014 |
| Lexstone Building Limited | Construction | 2012 |
| Lexus Ventures Limited | Manufacturing | 2010 |
| Leybarn Limited | Real estate | 1996 |
| Leyla Real Estates Limited | Real estate | 2025 |
| Leyland Overseas Holdings Limited | Professional & scientific | 1987 |
| Leyton Investments Ltd | Construction | 2015 |