| Land Invest 6 Limited | Construction | 2026 |
| Land Invest 7 Limited | Construction | 2026 |
| Land Invest 8 Limited | Construction | 2026 |
| Land Invest 9 Limited | Construction | 2026 |
| Landmark (Pecks Hill) Management Company Limited | Real estate | 2024 |
| Landscape Investments Limited | Real estate | 2002 |
| Landsdale Ltd | Real estate | 2023 |
| Langur Ltd | Information & communication | 2022 |
| Lannaby's Limited | Real estate | 1995 |
| Lantech Logistics Limited | Information & communication | 2006 |
| Lantern Property Holdings Limited | Real estate | 2020 |
| Lantern Recovery LLP | | 2007 |
| Lantern Recovery Specialists PLC | Wholesale & retail | 1987 |
| Lantern Services (Holdings) Ltd | Financial services | 2013 |
| Lanvin Trading Ltd | Professional & scientific | 1990 |
| Lashglow Limited | Extraterritorial | 1982 |
| Latta Consultancy Services Limited | Professional & scientific | 2018 |
| Laurel Fields Management Company Limited | Households | 1992 |
| Lawpond Limited | Real estate | 1998 |
| LB Heating & Plumbing Ltd | Construction | 2020 |
| LB Tyler Landscapes Ltd | Administrative & support | 2016 |
| LBS Construction Ltd | Construction | 2019 |
| Lcsl Properties Ltd | Real estate | 2023 |
| LD Nails 31 Ltd | Other services | 2025 |
| LDM Property Services Limited | Public administration | 2020 |
| LE Mans Classics Limited | Wholesale & retail | 2021 |
| LE Monde Communications Limited | Construction | 1993 |
| LEA Valley Mobility Ltd | Administrative & support | 2017 |
| Leabar Properties Limited | Real estate | 2021 |
| Leabody Limited | Arts & recreation | 2016 |
| Lead Roofing Solutions Limited | Construction | 2008 |
| Leadership Lift Ltd | Professional & scientific | 2025 |
| League Properties Limited | Real estate | 2002 |
| Leapmove Ltd | Real estate | 2019 |
| Lease and More Law Limited | Professional & scientific | 2020 |
| Lecale Homes Group (Developments) Limited | Construction | 2023 |
| Lecorsa LLP | | 2011 |
| Leda Construction International Limited | Construction | 2014 |
| LEE Management Services Limited | Administrative & support | 2005 |
| LEE Security Logistics Limited | Transport & logistics | 2014 |
| LEE Security Management Limited | Administrative & support | 2020 |
| Lefkara Ventures Ltd | Extraterritorial | 2013 |
| Leftside Limited | Administrative & support | 2014 |
| Legacy AM Ltd | Professional & scientific | 2024 |
| Legacy Gymnastics Limited | Arts & recreation | 2022 |
| Legend Presents Ltd | Arts & recreation | 2012 |
| Leicester Square Tickets Limited | Administrative & support | 2009 |
| Lella Soper Ltd | Professional & scientific | 2022 |
| Lemido Limited | Administrative & support | 2018 |
| Lenci Ltd | Construction | 2023 |
| Lentirim Limited | Information & communication | 2017 |
| LEO & Libra Ltd | Education | 2022 |
| LEO Properties Ventures Ltd | Real estate | 2023 |
| LEO Soft Drinks Limited | Wholesale & retail | 2001 |
| Leonidas Vehicle Solutions Limited | Extraterritorial | 2008 |
| Lester Hotels Group Limited | Professional & scientific | 1999 |
| Lester Hotels Management Services Limited | Hospitality | 1999 |
| Lester Hotels Topco Ltd | Financial services | 2024 |
| Leverage Networking Limited | Wholesale & retail | 2010 |
| Levington Trade, Ltd. | Administrative & support | 2009 |
| Levy Property Management Ltd | Real estate | 2024 |
| Lexe Consulting Ltd | Information & communication | 2023 |
| Lexham Gardens 118 Limited | Households | 2006 |
| Leyland Special Tuning Limited | Extraterritorial | 1994 |
| LF Creative Limited | Extraterritorial | 2020 |
| Lgeneration Ltd | Information & communication | 2023 |
| Lhanbryde Properties Ltd | Real estate | 2025 |
| Libramotors Ltd. | Wholesale & retail | 2013 |
| Libtek Ltd | Construction | 2019 |
| Lidia G&M Limited | Administrative & support | 2008 |
| Life RI Ltd | Financial services | 2025 |
| Lifestyle Wholesale Supplies Ltd | Wholesale & retail | 2016 |
| Lift Link Ltd | Transport & logistics | 2023 |
| Lilly's Nails (Potters Bar) Limited | Other services | 2022 |
| Lily's Crystal Cleaning Ltd | Administrative & support | 2022 |
| Lime Kiln Wharf Limited | Households | 1999 |
| Lime Tree Park (Southgate) Management Company Limited | Households | 2001 |
| Lime Walk Transport Limited | Transport & logistics | 2018 |
| Limmo UK Ltd | Hospitality | 2021 |
| Linkbroad Limited | Information & communication | 2024 |
| Linkmart Limited | Administrative & support | 1997 |
| Links Advice Limited | Other services | 2023 |
| Links Freehold Ltd | Real estate | 2025 |
| Lionheart Construction Ltd | Construction | 2000 |
| Liquid Oasis Limited | Financial services | 2023 |
| Liquid Waste Recycling Ltd | Water & waste | 2025 |
| Little Acorns Royston Limited | Health & social care | 2020 |
| Little Crafters Ltd | Hospitality | 2023 |
| Little Heath Property Management Limited | Real estate | 1964 |
| Little Heath Roofing Limited | Construction | 2022 |
| Little Park Gardens Management Company Limited | Households | 2024 |
| Little Phoenix Ltd | Wholesale & retail | 2020 |
| Little Winters Limited | Hospitality | 2013 |
| Live Alectrics Limited | Construction | 2014 |
| Live Autos Trading Ltd | Wholesale & retail | 2025 |
| Lkik Consulting Limited | Construction | 2019 |
| Lldirections Limited | Professional & scientific | 2025 |
| LLF Construction Limited | Construction | 2023 |
| LLJ Surveyors Limited | Administrative & support | 2025 |
| LMC Glass Ltd | Construction | 2019 |