| Landteam Developments Limited | Real estate | 2000 |
| Landteam Farms Limited | Agriculture & fishing | 2005 |
| Landteam Medina Park Limited | Real estate | 2018 |
| Landteam Property Investments Limited | Real estate | 1999 |
| Laneside Farm Management Company Limited | Real estate | 2005 |
| Langley Property Management Limited | Real estate | 1988 |
| Lanta Capital Ltd | Financial services | 2026 |
| Lanta Property Holdings Ltd | Real estate | 2026 |
| Lapleton Limited | Households | 1999 |
| Larches of Richmond Ltd | Wholesale & retail | 2022 |
| Larcole Global Concept Limited | Wholesale & retail | 2025 |
| Larkfield Consulting Ltd. | Professional & scientific | 2010 |
| Larkwood Investments Ltd | Real estate | 2023 |
| Lasbrey Limited | Professional & scientific | 2023 |
| Laser Holdings Limited | Financial services | 1999 |
| Last Enterprises Limited | Real estate | 2017 |
| Late Arrivals Limited | Arts & recreation | 2015 |
| LAU Capital Limited | Financial services | 2006 |
| Laura Jane Studio Ltd | Professional & scientific | 2022 |
| Lauren Aislinn Virtual Assistance Ltd | Professional & scientific | 2021 |
| Laverick Plant Hire Ltd | Agriculture & fishing | 2021 |
| Law Financial Limited | Professional & scientific | 2013 |
| Lawn Crescent Trustee Company (1985) Limited | Other services | 1985 |
| Lawson Equipment Ltd | Wholesale & retail | 2016 |
| Layers Hrtech Limited | Information & communication | 2024 |
| LBE Investment Holdings Ltd | Financial services | 2023 |
| LC Commercial Properties Limited | Real estate | 2024 |
| LCB Salcombe Limited | Transport & logistics | 2018 |
| LDN Roofworks Ltd | Construction | 2025 |
| LE Champ Holdings Ltd | Information & communication | 2021 |
| Lead Consilior Limited | Information & communication | 2023 |
| Leading Edge Authors Limited | Education | 2011 |
| Leading Edge I T Limited | Information & communication | 1995 |
| Leaf Planning Ltd | Extraterritorial | 2019 |
| Lean Coaching Group Limited | Professional & scientific | 2010 |
| Leaseactive Limited | Households | 1992 |
| Leda & Swan LLP | | 2012 |
| LEE Construction (LDG) Limited | Construction | 2004 |
| LEE High Development Limited | Construction | 2020 |
| Left Movement Ltd | Information & communication | 2025 |
| Legacy Media Ltd | Information & communication | 2015 |
| Legal and Regulatory Services Limited | Professional & scientific | 2014 |
| Legno Captive Holdings Ltd | Professional & scientific | 2022 |
| Legno Group Holdings Ltd | Professional & scientific | 2022 |
| Legno International Ltd | Financial services | 2024 |
| Legno Management Ltd | Professional & scientific | 2023 |
| Legno Services Ltd | Administrative & support | 2022 |
| Leisure & Care Ltd | Administrative & support | 2014 |
| Leisure Cars International Limited | Professional & scientific | 1994 |
| Leisure World Group Limited | Wholesale & retail | 2006 |
| Lejman Properties Limited | Real estate | 2015 |
| Lemon Accessories UK Limited | Wholesale & retail | 2008 |
| Lena Business Solutions Ltd | Information & communication | 2020 |
| Lennon & Horne Limited | Information & communication | 2017 |
| Leonnie Ltd | Other services | 2024 |
| Lern Ltd | Professional & scientific | 2020 |
| Leroy and Rose Ltd | Professional & scientific | 2026 |
| Lesley J Pope Ltd | Professional & scientific | 2018 |
| Less Entropy Ltd | Professional & scientific | 2025 |
| Less More Construction Ltd | Construction | 2025 |
| Letlegal.Com Limited | Real estate | 2013 |
| Lever Contemporary Limited | Professional & scientific | 2023 |
| Levett Square RTM Company Limited | Households | 2021 |
| Levitec Limited | Wholesale & retail | 2021 |
| Lexa Consulting Ltd | Financial services | 2004 |
| Lexicon Recruitment Limited | Administrative & support | 2016 |
| Lexicon Solutions Limited | Administrative & support | 2021 |
| Leyborne Consultancy Ltd | Professional & scientific | 2019 |
| Leyborne Limited | Education | 2023 |
| LFG123 Limited | Financial services | 2025 |
| LG Hair Limited | Other services | 2003 |
| LGF Events Ltd | Administrative & support | 2016 |
| Liam Mathers TM Ltd | Construction | 2023 |
| Liberty Corporate Ltd | Other services | 2006 |
| Liberty Mortgages Ltd | Financial services | 2018 |
| Lidan Limited | Professional & scientific | 2017 |
| Lidian Consulting Limited | Professional & scientific | 2026 |
| Life Cleanse Limited | Other services | 2014 |
| Life Playbook Ltd | Wholesale & retail | 2019 |
| Lifecover Limited | Financial services | 2002 |
| Lifesports Ltd | Extraterritorial | 2019 |
| Lifia Ltd | Financial services | 2017 |
| Light and Bitter Theatre Company Limited | Administrative & support | 2020 |
| Light Spaces Dark Places Animation Limited | Information & communication | 2018 |
| Light Spirit Company Limited(The) | Manufacturing | 1985 |
| Light Structures and Consultancy Ltd | Professional & scientific | 2020 |
| Lightwell Education Limited | Education | 2025 |
| Lightwork Labour Limited | Construction | 2023 |
| Lilly O Limited | Hospitality | 2019 |
| Lilomi | Public administration | 2018 |
| Lima Mike Group Ltd | Administrative & support | 2026 |
| Lime Lizard Design Limited | Arts & recreation | 2004 |
| Lincolns Inn Fields Limited | Real estate | 2025 |
| Linda Hill Limited | Administrative & support | 2007 |
| Linda J Richardson Limited | Professional & scientific | 2022 |
| Linden Richmond Management Company Limited | Real estate | 2014 |
| Lindens Residents Association Limited(The) | Households | 1967 |
| Lindiana Limited | Professional & scientific | 2023 |
| Lindsett Ltd | Professional & scientific | 2020 |
| Lindt & Sprungli (U.K.) Limited | Wholesale & retail | 1932 |