| Leathers Wear Limited | Wholesale & retail | 2019 |
| Leavershoodies.Com Limited | Extraterritorial | 2009 |
| Lech Breeding Ltd | Agriculture & fishing | 2017 |
| Lech Investments Limited | Construction | 2016 |
| LED LOW Energy Design Ltd | Professional & scientific | 2008 |
| Ledston Web Limited | Wholesale & retail | 2023 |
| LEE Allsorts Ltd. | Wholesale & retail | 2020 |
| LEE Everett Ltd | Financial services | 2025 |
| Left Bank Consultancy Limited | Professional & scientific | 2012 |
| Legalbeagles Group Ltd | Information & communication | 2014 |
| Legale Limited | Professional & scientific | 2026 |
| Legally Green Ltd | Wholesale & retail | 2023 |
| Leigh Andersen Carpentry Ltd | Construction | 2021 |
| Leigh Street Management Limited | Administrative & support | 2006 |
| Leisure Time Consultants Limited | Transport & logistics | 2005 |
| LEM RIS & Co Properties Limited | Real estate | 2022 |
| Lemmin Limited | Professional & scientific | 2012 |
| Lemoine Freeholding Ltd | Real estate | 2024 |
| Lenova Design Ltd | Information & communication | 2008 |
| LEO Building Contractors Limited | | 1989 |
| LEO Moon Ltd | Manufacturing | 2014 |
| Leotes Ltd | Mining & quarrying | 2025 |
| LER Property Limited | Real estate | 2022 |
| Lessees of 23 Prestonville Road Brighton Limited | Households | 1998 |
| Lesters & Co Holdings 1 Limited | Real estate | 2020 |
| Lesters and Co | Real estate | 1982 |
| Let's Holiday Brighton Ltd | Hospitality | 2019 |
| Lets Trading Ltd | Real estate | 2025 |
| Letsgo Furniture Ltd | Wholesale & retail | 2004 |
| Let’S Aesthetics Skin and Beauty Ltd | Other services | 2025 |
| Level Active Ltd | Wholesale & retail | 2022 |
| Level Headed Property Ltd | Real estate | 2026 |
| Levo Bakes Ltd | Wholesale & retail | 2019 |
| Levrant-Rich Limited | Manufacturing | 1962 |
| Lewes Martial Arts Limited | Education | 2023 |
| Lewes Road Store Ltd | Wholesale & retail | 2018 |
| Lewis Bright Property Services Ltd | Administrative & support | 2024 |
| Lewis Estates Ltd | Real estate | 2007 |
| Lewis Properties (UK) Limited | Real estate | 2015 |
| Lewis Property Management Ltd | Real estate | 2015 |
| Lewis Yorke-Johnson Investments LLP | | 2016 |
| Lexi Property Ltd | Real estate | 2018 |
| Lexi Property Management Limited | Real estate | 2025 |
| Lexmar Ltd | Professional & scientific | 2007 |
| Lexport Ltd | Wholesale & retail | 2024 |
| Lextons Auctions Limited | Wholesale & retail | 2021 |
| Lextons Holdings Ltd | Other services | 2019 |
| Lextons Sales & Auctions Ltd | Real estate | 2025 |
| Leyland Richardson Antiques Limited | Administrative & support | 2012 |
| Leyland Richardson Properties Ltd | Real estate | 2020 |
| LGL Networks Limited | Information & communication | 2026 |
| LGL Sales Ltd | Wholesale & retail | 2015 |
| LHC Labs Ltd | Information & communication | 2025 |
| Libertyhall Management Ltd. | Real estate | 2012 |
| Library Productions Limited | Arts & recreation | 2012 |
| Licensed Trade Auditors (South) Ltd | Administrative & support | 2024 |
| Licensed Trade Auditors Ltd | Administrative & support | 2015 |
| Lichfield Hove Limited | Real estate | 2012 |
| Life Clubs Limited | Other services | 2007 |
| Life IS Movement Ltd | Health & social care | 2024 |
| Life Lasting PR Limited | Professional & scientific | 2006 |
| Life Less Ordinary Jewellery Limited | Wholesale & retail | 2019 |
| Life Rhythms Limited | Construction | 1997 |
| Lifelong Physiotherapy Ltd | Health & social care | 2018 |
| Lifescape Coaching Limited | Other services | 2018 |
| Lifestyle Retreats Limited | Professional & scientific | 2024 |
| Lifestyling Agent C Ltd | Administrative & support | 2008 |
| Lift Health Limited | Health & social care | 2024 |
| Light & Life Ltd | Real estate | 2024 |
| Lightfoot Holdings Limited | Construction | 2021 |
| Lighthouse Courses Ltd | Education | 2015 |
| Lighthouse Electric Ltd | Construction | 2015 |
| Lighthouse Marketing Ltd | Administrative & support | 2001 |
| Lightning Pixels Ltd | Information & communication | 2021 |
| Lightspace Partnership Limited | Professional & scientific | 1998 |
| Lightworth Ltd | Construction | 2018 |
| Likapa Digital Ltd | Manufacturing | 2020 |
| Lilly Eastbourne Ltd | Households | 2026 |
| Lilly of the Valley Ltd | Other services | 2026 |
| Lily China Ltd | Health & social care | 2024 |
| Lima Delta Ltd | Education | 2020 |
| Lima Nikkei Ltd | Hospitality | 2025 |
| Lime Developments Ltd | Real estate | 2025 |
| Lime Editions Ltd | Information & communication | 2011 |
| Limecrown Limited | Information & communication | 2016 |
| Limehouse Securities Ltd | Real estate | 2010 |
| Limehouse Trading Limited | Wholesale & retail | 2015 |
| Limeworks Cambridge Management Company Limited | Households | 2021 |
| Lincoln and Churchill Co Ltd | Health & social care | 2026 |
| Lincoln Estates Limited | Real estate | 1990 |
| Lincoln Family Holdings Ltd | Financial services | 2023 |
| Lincoln Gibbons Property Investments Limited | Real estate | 2002 |
| Lincoln Holland Holdings Limited | Real estate | 2002 |
| Lincoln Holland JV Limited | Construction | 2012 |
| Linden House Developments Limited | Construction | 2014 |
| Lindenfrench Limited | Real estate | 2003 |
| Lindsay Wittenberg Limited | Professional & scientific | 2003 |
| Linktrend Ltd | Health & social care | 2023 |
| Lion House Properties Limited | Real estate | 2023 |
| Lioncare Limited | Other services | 1991 |