| Leger Grove Health Care Limited | Health & social care | 2023 |
| Leger Lakes Ltd | Agriculture & fishing | 2021 |
| Legitimatetrading Limited | Real estate | 2024 |
| Lehel International Limited | Manufacturing | 2020 |
| Leigh Financial Ltd | Financial services | 2026 |
| Leigh’S Property Development Ltd | Real estate | 2026 |
| Leisure Equipment Rentals Limited | Administrative & support | 2009 |
| Leisure United | Arts & recreation | 2016 |
| Leisure United Enterprises Limited | Arts & recreation | 2021 |
| Leisurelend Ltd | Administrative & support | 2023 |
| Leit Ltd | Financial services | 2009 |
| Leith Publishing Ltd | Information & communication | 2023 |
| Lekano Game Ltd | Information & communication | 2025 |
| Lelilai Wall Decoration Trading Co., Ltd | Wholesale & retail | 2025 |
| Lelo RMN Limited | Health & social care | 2014 |
| Leman Holding Limited | Hospitality | 2018 |
| Lemar General Trading Ltd | Wholesale & retail | 2021 |
| Lemark Holdings Limited | Professional & scientific | 2010 |
| Lembas Trustees Limited | Professional & scientific | 2015 |
| Lemmingworks Language Apps Ltd | Information & communication | 2025 |
| Lemmingworks Ltd | Information & communication | 2015 |
| Lemon Grass (Chichester) Limited | Hospitality | 2010 |
| Lemon Grass (MID Sussex) Limited | Hospitality | 2013 |
| Lemon Grass (Petersfield) Limited | Hospitality | 2011 |
| Lemon Grass Hove Limited | Hospitality | 2017 |
| Lemon Grass Lewes Limited | Hospitality | 2016 |
| Lemon Town Limited | Hospitality | 2024 |
| Lemongrass Burgess Hill Limited | Hospitality | 2016 |
| Lemongrass Cranleigh Limited | Hospitality | 2016 |
| Lemont Investment Ltd | Professional & scientific | 2015 |
| Lemont Media Publishing Limited | Information & communication | 2018 |
| Lemont Right Management Limited | Information & communication | 2017 |
| Lemont Services Ltd | Professional & scientific | 2015 |
| Lemscorp Associates Limited | Professional & scientific | 2007 |
| Lemuria International Ltd | Wholesale & retail | 2022 |
| Lenborough Management Services Ltd | Administrative & support | 2011 |
| Lencon Properties Limited | Real estate | 2025 |
| Lend and Tend Limited | Information & communication | 2024 |
| Lenny&Ovie Ltd | Transport & logistics | 2025 |
| LEO 1959 Limited | Extraterritorial | 2013 |
| LEO Alexander Wealth & Financial Management Limited | Financial services | 2010 |
| LEO Estate Management Ltd | Hospitality | 2026 |
| LEO Italian Food Ltd | Hospitality | 2021 |
| LEO REX Properties Ltd | Real estate | 2025 |
| LEO Services Hub Ltd | Wholesale & retail | 2025 |
| Leofin Advisory Limited | Professional & scientific | 2019 |
| Leonardo Testing Services Limited | Professional & scientific | 2006 |
| Leonidas Building Contractor Ltd | Construction | 2017 |
| Leopards Logistics UK Ltd | Transport & logistics | 2021 |
| Leoz Auto Limited | Wholesale & retail | 2026 |
| Leozidas Ltd | Education | 2025 |
| LEP Fitness Limited | Arts & recreation | 2014 |
| LEP Property Development Ltd | Real estate | 2020 |
| Lepton Heights Health Care Limited | Health & social care | 2023 |
| LER Plumbing (Yorkshire) Ltd | Construction | 2018 |
| Leriba Media Limited | Information & communication | 2025 |
| LES Lovers Limited | Arts & recreation | 2003 |
| Lesley Dike Limited | Health & social care | 2003 |
| Lespritdelescalier Limited | Information & communication | 2016 |
| LET 2 U Ltd | Real estate | 2012 |
| LET Luce Productions Limited | Information & communication | 2016 |
| LET Prep Limited | Construction | 2012 |
| Let's Ballad Limited | Arts & recreation | 2007 |
| Let's Deal Online Ltd | Wholesale & retail | 2020 |
| Let's Make IT Better Ltd | Health & social care | 2023 |
| Let's Verbalise Limited | Education | 2016 |
| Letlambie Ltd | Real estate | 2023 |
| Letmur Limited | Health & social care | 2014 |
| Letonline Ltd | Wholesale & retail | 2023 |
| Lets Build Clumber Limited | Construction | 2025 |
| Lets Inspire | Hospitality | 2018 |
| Lets Nether Edge Ltd | Real estate | 2019 |
| Lets Play Business Ltd | Administrative & support | 2025 |
| Lets Sushi Limited | Hospitality | 2015 |
| Lets Take Back Control Limited | Other services | 2017 |
| Letsbuild (Property Services) Limited | Real estate | 2000 |
| Letterbox Gifts Ltd. | Wholesale & retail | 2015 |
| Lettings HQ Properties Limited | Real estate | 2016 |
| Lettings Made Simple Limited | Construction | 2025 |
| Letwise Limited | Real estate | 2003 |
| Letzgroup Ltd | Real estate | 2009 |
| Letzmove Holdings Ltd | Professional & scientific | 2023 |
| Letzmove Lettings Services Limited | Real estate | 2023 |
| Leumas-Tech Ltd | Manufacturing | 2025 |
| Lev's Delivery Ltd | Hospitality | 2019 |
| Levant Pharmaceuticals Manufacturing Ltd | Manufacturing | 2025 |
| Levante Group Ltd | Wholesale & retail | 2021 |
| Level UP Lean Ltd | Education | 2023 |
| Level UP Solutions Ltd | Professional & scientific | 2006 |
| Level-Up Accountancy & Tax Limited | Professional & scientific | 2024 |
| Levelcity Limited | Wholesale & retail | 1992 |
| Lever House Limited | Wholesale & retail | 2003 |
| Leverage Point Entertainment Ltd. | Information & communication | 2021 |
| Levers & Greaves Ltd | Hospitality | 2021 |
| Levesley Electrical Limited | Construction | 2021 |
| Leveson Engineering Consultancy Limited | Professional & scientific | 2021 |
| Leviat Limited | Manufacturing | 1925 |
| Leviathan Design Tree Ltd | Professional & scientific | 2025 |
| Levine Developments Limited | Real estate | 2017 |
| Levine Investment Co Ltd | Financial services | 2019 |