| Lawrence Property Investments (Kent) Limited | Real estate | 2018 |
| Laws and Ross Limited | Real estate | 2024 |
| LB Quantity Surveying Ltd | Professional & scientific | 2025 |
| Lb&Dht Limited | Health & social care | 2014 |
| LBC Couriers Limited | Transport & logistics | 2011 |
| LBC2 Couriers Limited | Transport & logistics | 2014 |
| LC Electrical South Ltd | Construction | 2020 |
| LCL Compliance Ltd | Professional & scientific | 2025 |
| LCM Property Maintenance Ltd | Administrative & support | 2025 |
| LDH Water Service Ltd | Construction | 2024 |
| LDJ Scaffold Design Limited | Professional & scientific | 2014 |
| Ldjqs Ltd | Administrative & support | 2023 |
| LDN GAS & Heating Limited | Construction | 2017 |
| LE Bleu Holdings Ltd | Real estate | 2024 |
| Leadcrest Limited | Extraterritorial | 2008 |
| Leading Edge Resources Limited | Information & communication | 2015 |
| Leadwood Care Limited | Health & social care | 2014 |
| Leaf IT OUT Landscaping Ltd | Construction | 2026 |
| Leaflets 4 U Ltd | Information & communication | 2014 |
| LEARNING4LIVING Ltd | Education | 2021 |
| Leaway Ltd | Professional & scientific | 2024 |
| Lebrasse Electrical Services Ltd. | Construction | 2016 |
| LEE IND Limited | Administrative & support | 2016 |
| Leechcroft Carpentry Services Limited | Manufacturing | 2013 |
| Legal Artificial Intelligence Development (Legalaid) Limited | Information & communication | 2025 |
| Leiach Electrical Contractors Ltd | Construction | 2012 |
| Leiach Maintenance Ltd | Construction | 2025 |
| Leigh Academies Trust | Education | 1989 |
| Leigh Hall Road Properties Limited | Households | 2025 |
| Leisure Hire Limited | Arts & recreation | 2004 |
| Leisure Tech Investments Limited | Transport & logistics | 1986 |
| LEJ Properties Ltd | Administrative & support | 2013 |
| Lemma Enterprises Limited | Wholesale & retail | 2025 |
| Lenfield Engineering Limited | Manufacturing | 2022 |
| Lenflo Waste Ltd | Water & waste | 2023 |
| Lenstech Security Ltd | Wholesale & retail | 2025 |
| LEO Tyres Ltd | Wholesale & retail | 2022 |
| Leolyn Ltd | Public administration | 2020 |
| Leppard Clinical Psychology LLP | | 2024 |
| LET ME BEE Limited | Real estate | 2025 |
| Letwise Holdings Ltd | Real estate | 2025 |
| Level 10 Ltd | Financial services | 2025 |
| Levens FOX & Sons Limited | Real estate | 2003 |
| Lever Scott International Limited | Administrative & support | 2025 |
| Leviston Developments Limited | Construction | 2020 |
| Leviston Investments Limited | Real estate | 2020 |
| Lewis Fire & Electrical Ltd | Construction | 2016 |
| Lewis Odds Ltd | Construction | 2022 |
| Lewisham Advice Ltd | Professional & scientific | 2021 |
| Lexington Homes Ltd | Real estate | 2006 |
| LF Gardens Landscape Ltd | Administrative & support | 2026 |
| Lgoto Ltd | Health & social care | 2012 |
| LGT Timber Ltd | Wholesale & retail | 2024 |
| LH Film Services Ltd | Construction | 2017 |
| LH Noble Ltd | Professional & scientific | 2025 |
| LH Recruitment Ltd | Administrative & support | 2023 |
| LHD Developments Ltd | Professional & scientific | 2025 |
| Libby's Livery Ltd | Agriculture & fishing | 2022 |
| Libby's Livery Yard Ltd | Agriculture & fishing | 2024 |
| Liberty Dining Limited | Hospitality | 2017 |
| Liberty Spice Limited | Hospitality | 2017 |
| Libex Properties Ltd | Real estate | 2024 |
| Libra Advisory Limited | Professional & scientific | 2024 |
| Libra Capital Holdings Limited | Financial services | 2025 |
| Libra Property and Holdings Ltd | Real estate | 2019 |
| Libra Securities LLP | | 2025 |
| LID Construction Services Ltd | Construction | 2021 |
| Life Impact Publishing Ltd | Information & communication | 2025 |
| Life Inc | Other services | 2017 |
| Lifejacket Outlet Limited | Wholesale & retail | 2025 |
| Lifestyle Goals Ltd | Education | 2021 |
| Lifetime Capital (Academy) Limited | Information & communication | 2022 |
| Lifetime Capital Wealth Management Ltd | Information & communication | 2022 |
| Lift Support Services Limited | Manufacturing | 2006 |
| Liftec Crane Services Ltd | Construction | 2023 |
| Lifting Equipment Specialists Ltd | Manufacturing | 2009 |
| Lillechurch Farms & Contracting Ltd. | Agriculture & fishing | 1996 |
| Lilli & Co Ltd | Construction | 2025 |
| Lilly Exotics Ltd | Wholesale & retail | 2013 |
| Lily Nails TP Ltd | Other services | 2019 |
| Limehouse Restaurant UK Ltd | Hospitality | 2017 |
| Limewood Homes Limited | Real estate | 2005 |
| Limitless Shinez Ltd | Administrative & support | 2024 |
| Linchpin Advisory Limited | Financial services | 2018 |
| Linchpin IFM Limited | Financial services | 2010 |
| Linear Wealth Limited | Financial services | 2026 |
| Lineside Investments Limited | Real estate | 2005 |
| Linjay Property Limited | Other services | 2020 |
| Linkus Properties Limited | Real estate | 2022 |
| Linnea IT Ltd | Information & communication | 2012 |
| Lionhart Ltd | Wholesale & retail | 2007 |
| Lirol Health Limited | Health & social care | 2023 |
| Lisa Lashes School of Music Ltd | Information & communication | 2018 |
| Lisa Sewell Permanent Makeup Ltd | Other services | 2022 |
| Little Acres Day Nursery and Pre-School Limited | Health & social care | 2022 |
| Little Book of Locals Limited | Professional & scientific | 2019 |
| Little C'S Children's Clothing Ltd | Wholesale & retail | 2024 |
| Little C-S Boutique Limited | Wholesale & retail | 2018 |
| Little Cat Cafe Gravesend Ltd | Hospitality | 2025 |
| Little Diamond Tanning Ltd | Other services | 2023 |