| Levan & Yarok Assist Ltd | Transport & logistics | 2025 |
| Levanani Limited | Hospitality | 2024 |
| Levant Loom Ltd | Wholesale & retail | 2025 |
| Levare Digital Limited | Information & communication | 2025 |
| Level 3 Global Developments Limited | Professional & scientific | 2014 |
| Level Dancewear Ltd | Wholesale & retail | 2024 |
| Level Lifts Ltd | Manufacturing | 2024 |
| Level Threads Limited | Extraterritorial | 2025 |
| Level UP Financial Limited | Professional & scientific | 2025 |
| Levelled Ltd | Information & communication | 2026 |
| Levelled Tutoring Limited | Education | 2025 |
| Levelling UP Sports Limited | Arts & recreation | 2025 |
| Levelmedia Ltd | Professional & scientific | 2015 |
| Levels Recruitment Ltd | Health & social care | 2023 |
| Levely Limited | Wholesale & retail | 2004 |
| Levely Properties Limited | Real estate | 2021 |
| Leven Willow Limited | Real estate | 2025 |
| Lever Technology Group Limited | Information & communication | 1996 |
| Lever Technology Solutions Ltd. | Information & communication | 1996 |
| Lever Technology Training Ltd. | Information & communication | 1996 |
| Leveric Ltd | Wholesale & retail | 2021 |
| Levina Limited | Real estate | 2018 |
| Levings Consultancy Ltd | Professional & scientific | 2024 |
| Levira Media Services Ltd | Information & communication | 2025 |
| Lewcombe Flat Management Company Limited | Households | 1976 |
| Lewinski & Smith Financial Services Limited | Financial services | 2010 |
| Lewis & Co Trading Ltd | Wholesale & retail | 2020 |
| Lewis B.R.I. Ltd | Financial services | 2013 |
| Lewis Civil Engineering Limited | Construction | 2010 |
| Lewis Holdco Ltd | Financial services | 2016 |
| Lewis Knight Property Limited | Real estate | 2024 |
| Lewis Owen Ltd | Real estate | 2019 |
| Lewisham Hall (Management Company) Limited | Real estate | 2004 |
| LEX Auto Garage Repair Ltd | Wholesale & retail | 2026 |
| LEX Autos Ltd | Wholesale & retail | 2025 |
| LEX Connect Ltd | Administrative & support | 2024 |
| LEX Solutions Limited | Hospitality | 2025 |
| Lexaire Limited | Professional & scientific | 2014 |
| Lexbury Trading Design Limited | Wholesale & retail | 2015 |
| Lexeme Ltd | Professional & scientific | 2023 |
| Lexfield Properties Limited | Real estate | 2004 |
| Lexi's Hair Design Ltd | Other services | 2021 |
| Lexia Solutions Group Limited | Professional & scientific | 2004 |
| Lexia Solutions Trustees Limited | Professional & scientific | 2020 |
| Lexis Advisory Ltd | Professional & scientific | 2014 |
| Lexis I.T. Limited | Information & communication | 2010 |
| Lexmill Limited | Real estate | 2012 |
| Lexp Sports Ltd | Arts & recreation | 2025 |
| Lexsu Ltd | Health & social care | 2018 |
| Lextra Education Ltd | Education | 2015 |
| Lexus Manor Ltd | Real estate | 2025 |
| LEY Property Investments Limited | Real estate | 2020 |
| Leyfield Farm Limited | Agriculture & fishing | 2024 |
| Leyg Consultancy Ltd | Information & communication | 2007 |
| Leymarc Limited | Real estate | 2024 |
| Leysholme 1962 Limited | Extraterritorial | 2013 |
| Leziza Curry House Ltd | Hospitality | 2025 |
| LF Associates Limited | Construction | 2003 |
| LF Solutions Holdings Limited | Financial services | 1998 |
| LFC Estates Ltd | Real estate | 2021 |
| LFC Translations Ltd | Professional & scientific | 2018 |
| LFH Regulatory Limited | Professional & scientific | 2018 |
| LFO Group Limited | Manufacturing | 2016 |
| LFP Financial Planning & Wealth Management Limited | Financial services | 2008 |
| Lfretailsuppliers Ltd | Wholesale & retail | 2023 |
| LFUK25 Limited | Professional & scientific | 2012 |
| LG Civils Ltd | Construction | 2025 |
| LG Power & Engineering Limited | Manufacturing | 2025 |
| LG Project Solutions Ltd | Professional & scientific | 2020 |
| LGB Building Services Ltd | Construction | 2016 |
| Lgbtq+ Inclusive Medical Education Alliance Ltd | Education | 2024 |
| LGC Electrical Services Ltd | Construction | 2018 |
| LGC Transport Ltd | Transport & logistics | 2026 |
| LGE Services Limited | Professional & scientific | 2017 |
| LGH Property Development and Investment Ltd | Real estate | 2025 |
| LGK Scaffolding Ltd | Construction | 2025 |
| LGM (UK) Limited | Professional & scientific | 2013 |
| LGR Management Services Ltd | Administrative & support | 2024 |
| LH Editing Limited | Information & communication | 2020 |
| LH Properties (Leeds) Ltd | Real estate | 2020 |
| LH Roofing Consultants Limited | Construction | 2011 |
| LH Service Management Limited | Administrative & support | 2025 |
| Lhasa Limited | Professional & scientific | 1983 |
| LHC Enterprise Limited | Wholesale & retail | 2021 |
| LHC Media Limited | Professional & scientific | 2023 |
| LHF Haulage Limited | Transport & logistics | 2011 |
| Lhpc Consultants Ltd | Professional & scientific | 2023 |
| LHS Events Limited | Administrative & support | 2019 |
| Lh’London Ltd | Wholesale & retail | 2019 |
| LI3 Limited | Real estate | 2015 |
| Liaison Worldwide Limited | Arts & recreation | 2023 |
| Liam Barrick GAS & Plumbing Limited | Construction | 2021 |
| Liam Care Associates Ltd. | Health & social care | 2022 |
| Liam Gill Consulting Ltd | Professional & scientific | 2013 |
| Liams Retail Limited | Wholesale & retail | 2026 |
| Liamscottlims Ltd | Information & communication | 2026 |
| Lianne Marie Ltd | Hospitality | 2025 |
| Liaqat ALI Property Holdings Limited | Households | 2025 |
| LIB Works Ltd | Professional & scientific | 2018 |
| Liber Financial Ltd | Administrative & support | 2022 |