| L.A. Coaker Brickwork and Construction Ltd. | Construction | 2022 |
| L.C. Hobbs & SON Limited | Agriculture & fishing | 1966 |
| L.T.W Horse Transport Ltd | Transport & logistics | 2015 |
| LA Comber Holdings Limited | Financial services | 2026 |
| LA Rusta Ltd | Hospitality | 2013 |
| LAB Commissioning Ltd | Construction | 2025 |
| Label Thirty-Six Ltd | Wholesale & retail | 2023 |
| Ladr IT Consulting Ltd | Information & communication | 2018 |
| Lake Logistics Ltd | Transport & logistics | 2026 |
| Laker Building and Fencing Supplies Limited | Wholesale & retail | 2010 |
| Lakestreet Ltd | Other services | 2008 |
| Lakeview Drive Ltd | Households | 2017 |
| Lakeview Syndicate Limited | Real estate | 2025 |
| Lakshmmi Spiritual Services Limited | Education | 2025 |
| Lalita Enterprise Ltd | Transport & logistics | 2022 |
| Lallas Consult Limited | Information & communication | 2018 |
| Lambourn Electrical Services Ltd | Construction | 2025 |
| Lamonde Automation Limited | Professional & scientific | 1982 |
| Landcast Property Management Ltd | Real estate | 2023 |
| Landlord Advice UK Limited | Professional & scientific | 2023 |
| Landrock Phillips Limited | Administrative & support | 2009 |
| Lane Breakers Limited | Professional & scientific | 2022 |
| Lane Consulting Services Limited | Professional & scientific | 2026 |
| Lang Road PLC | Financial services | 2020 |
| Langley Green Travel Ltd | Transport & logistics | 2024 |
| Langley Green Tyres Ltd | Wholesale & retail | 2012 |
| Langley Recruitment Solutions Ltd. | Information & communication | 2018 |
| Langshott Landscapes and Utilities Limited | Administrative & support | 2010 |
| Lanterns Construction Services Limited | Professional & scientific | 2019 |
| Larakaia Property Ltd | Real estate | 2026 |
| Large Hospitality Gatwick Ltd | Real estate | 2024 |
| Large Hospitality Main Ltd | Real estate | 2024 |
| Large Hospitality Waterhall Ltd | Real estate | 2024 |
| Lark Park Theatre Ltd | Arts & recreation | 2026 |
| Larry's House Ltd | Construction | 2023 |
| Laser Chips Ltd | Information & communication | 2025 |
| Lastovetchi Property Management Ltd | Real estate | 2025 |
| Lathams Dairy Limited | Real estate | 1965 |
| Lattice Semiconductor UK Ltd. | Administrative & support | 1994 |
| Laundrybird Limited | Other services | 2024 |
| Laurel Management Company Limited | Households | 1980 |
| Lave Property Services Limited | Construction | 2014 |
| Lavender Homecare Limited | Health & social care | 2024 |
| Lawn Imperial Limited | Construction | 1978 |
| Lawnhopper (Sussex) Limited | Administrative & support | 2021 |
| Lawsons Lofts West Sussex Limited | Construction | 2021 |
| Lawtree Engine Limited | Information & communication | 2026 |
| Lawtree Holdings Limited | Information & communication | 2026 |
| Lawtree Limited | Professional & scientific | 2026 |
| Lazmat Engineers Limited | Wholesale & retail | 2012 |
| LB 4 Solutions Limited | Administrative & support | 2019 |
| Lbfg Ltd | Manufacturing | 2022 |
| Lbkb Services Ltd | Transport & logistics | 2018 |
| LC Build Construction Ltd | Construction | 2024 |
| LC Circuits Limited | Wholesale & retail | 2025 |
| LC Wholesale Ltd | Wholesale & retail | 2024 |
| Lclg Ltd | Real estate | 2020 |
| LDN Leads Ltd | Information & communication | 2025 |
| LDN Projects Ltd | Construction | 2020 |
| LDS GM Ltd | Information & communication | 2018 |
| LE Mans Coupes Limited | Wholesale & retail | 2003 |
| Leader Gastronomy 2020 Ltd | Hospitality | 2020 |
| LEADERSHIP1 Limited | Professional & scientific | 2016 |
| Leaf Biryani House Ltd | Hospitality | 2026 |
| Leafden Limited | Professional & scientific | 2010 |
| Leafe Investments Ltd | Wholesale & retail | 2017 |
| Learn Mate Limited | Education | 2023 |
| Ledlite Europe Ltd | Extraterritorial | 2012 |
| LEE Challis Developments Ltd | Construction | 2024 |
| LEE Davey Caravans Limited | Wholesale & retail | 1950 |
| LEE Suite Limited | Hospitality | 2024 |
| Leepizzan Ltd | Real estate | 2019 |
| Leetchee Ltd | Financial services | 2019 |
| Legacy Estates London Ltd | Real estate | 2025 |
| Legacy Roofing Ltd | Construction | 2026 |
| Legalvision Ltd | Professional & scientific | 2015 |
| Legends Professional Barbers Ltd | Administrative & support | 2020 |
| Legit Criminal Clothing Ltd | Wholesale & retail | 2020 |
| Legit Promotional Products (LPP) Ltd | Wholesale & retail | 2025 |
| Legwood Properties Limited | Real estate | 2017 |
| Lekaj Property Services Ltd | Construction | 2021 |
| Lenham Garages Limited | Wholesale & retail | 1960 |
| Lenham Storage (Midlands) Limited | Financial services | 2019 |
| Lenham Storage (Southern) Limited | Transport & logistics | 1966 |
| Lenham Storage Company Limited | Transport & logistics | 1949 |
| Lenmar Estates LLP | | 2024 |
| LEO Cancer Care Ltd | Manufacturing | 2018 |
| LEO Luis Limited | Arts & recreation | 2018 |
| LEO P Ltd | Wholesale & retail | 2025 |
| Leoland Limited | Professional & scientific | 2004 |
| Leoli Properties Ltd | Real estate | 2024 |
| Leonora’S Logistics Ltd | Transport & logistics | 2021 |
| Lestda Limited | Construction | 2020 |
| Levy Ville Limited | Professional & scientific | 2016 |
| Lewes Hand Car Wash Ltd | Other services | 2014 |
| Lewis and Dick Limited | Professional & scientific | 2018 |
| Lextraq Ltd | Professional & scientific | 2024 |
| Lezu Electrical Ltd | Construction | 2026 |
| LHC Global Ltd | Real estate | 2023 |
| Libbi Ltd | Arts & recreation | 2019 |