| Langley Court (Reigate) Residents Association Limited | Households | 1972 |
| Langley House Management Company Limited | Households | 1980 |
| Language Melody Limited | Education | 2012 |
| Languages & Politics Education Ltd | Education | 2016 |
| Langwood Management Company Limited | Households | 1986 |
| Lanjis Properties Limited | Real estate | 2021 |
| Lanley Group Limited | Administrative & support | 2021 |
| Lansdown, Groves Avenue Flat Management Co. Limited | Households | 1976 |
| Lansdowne Place Management Company Limited | Households | 1991 |
| Lantain Limited | Administrative & support | 2012 |
| Lanura Client Services Limited | Administrative & support | 2016 |
| Lapilla Healthcare Ltd | Administrative & support | 2023 |
| Lara Car Wash Ltd | Administrative & support | 2024 |
| Larabay Limited | Wholesale & retail | 1990 |
| Larch Vale Management Company Limited | Households | 1982 |
| Lardner Locksmiths Limited | Construction | 2014 |
| Lares Digital Ltd | Information & communication | 2020 |
| Larh Brothers Ltd | Wholesale & retail | 2023 |
| Larisa Car Wash Ltd | Administrative & support | 2014 |
| Larrysoft PC Services Ltd | Information & communication | 2008 |
| Laser by Carly Ltd | Other services | 2019 |
| Laser OFF Ltd | Administrative & support | 2025 |
| Laser Scaffolding (Southern) Limited | Construction | 1994 |
| Lashed by Chanelle Ltd | Other services | 2021 |
| Laskar Oxford Limited | Real estate | 2025 |
| Laststop Coach Hire Ltd | Transport & logistics | 2006 |
| Latadevi Properties Limited | Real estate | 2020 |
| Latchmere Place Residents Company Limited | Households | 2011 |
| Lateena Limited | Hospitality | 2024 |
| Latest Convenience Store Ltd | Administrative & support | 2004 |
| Latimer Gate Management Company Limited | Households | 2010 |
| Latin House Limited | Hospitality | 2018 |
| Latino Blend Ltd | Wholesale & retail | 2019 |
| Latitude Compliance & Risk Management Limited | Administrative & support | 2013 |
| Latitude Croydon Ltd | Real estate | 2015 |
| Latitude Property Management Limited | Administrative & support | 2024 |
| Latitude Ventures Limited | Financial services | 2026 |
| Laughing Llama Ltd | Information & communication | 2012 |
| Launch PAD Properties Ltd | Real estate | 2015 |
| Launchpad (Mars) Ltd | Real estate | 2018 |
| Launchpad (Mercury) Ltd | Real estate | 2017 |
| Launchpad (Saturn) Ltd | Real estate | 2018 |
| Launchpad (Venus) Ltd | Real estate | 2018 |
| Laundon House (Management) Limited | Households | 2018 |
| Laundry House Express Ltd | Other services | 2026 |
| Laura Close Management Company Limited | Households | 2006 |
| Laura Sutton Limited | Real estate | 2025 |
| Laurac Brows Limited | Education | 2017 |
| Laureene Management Company Limited | Households | 1985 |
| Laurel House Management Company (2002) Limited | Households | 2002 |
| Laurenti U.K. Limited | Manufacturing | 2001 |
| Laurynson Red Consulting Limited | Administrative & support | 2013 |
| Lavaprint Limited | Manufacturing | 2026 |
| Lavaradil Property Investments Limited | Real estate | 2025 |
| Lavender Fields (Management Company) Limited | Households | 2021 |
| Lavern's Turn (UK) Ltd | Administrative & support | 2008 |
| Laverstock Management Corpor Ltd | Real estate | 2022 |
| Lavington Enterprises Ltd | Real estate | 2023 |
| Law Eagles Limited | Administrative & support | 2011 |
| Law X Ltd | Professional & scientific | 2017 |
| Lawling Marine Services Limited | Manufacturing | 1995 |
| Lawn Road Residents' Association Limited | Households | 1980 |
| Lawnswood Court Management Company Limited | Households | 2012 |
| Lawnswood Drive (Lawnswood) Management Company Limited | Households | 2012 |
| Lawrence Property Investments Limited | Real estate | 2004 |
| LAWS4U Limited | Construction | 2013 |
| Lawson Street Apartments Limited | Households | 2007 |
| Lawton Court Management Limited | Households | 1989 |
| LAY Wood (Devizes) Management Company Limited | Households | 2017 |
| Layla's Garden UK Ltd | Education | 2025 |
| Layren Associates Ltd | Administrative & support | 2014 |
| Lazaro Homes Limited | Construction | 2007 |
| Lazio Deli Limited | Hospitality | 2026 |
| Lazy Scientist Ltd | Manufacturing | 2018 |
| Lbsp Construction Ltd. | Construction | 2018 |
| LC Recruitment Limited | Administrative & support | 2020 |
| Lcaowen Limited | Construction | 2025 |
| LCB Asethetics Ltd | Other services | 2026 |
| LCE Property Limited | Real estate | 2026 |
| LCF Activities Limited | Administrative & support | 2009 |
| LCG Consulting Limited | Professional & scientific | 2025 |
| Lckg Limited | Manufacturing | 2020 |
| LCO Sport Limited | Arts & recreation | 2025 |
| Lcuk Croydon Ltd | Other services | 2021 |
| Lcvs Ltd | Wholesale & retail | 2024 |
| LCW Consulting Ltd | Administrative & support | 2015 |
| LDN Carz Limited | Transport & logistics | 2025 |
| LDN Roofing Group Ltd | Construction | 2026 |
| LDN Smash Ltd | Hospitality | 2026 |
| LE Barian Beauty Ltd | Wholesale & retail | 2023 |
| LE Barian Ltd | Health & social care | 2023 |
| LE Business Limited | Wholesale & retail | 2012 |
| LE Delice Ltd. | Hospitality | 2013 |
| LE Nails Croydon Ltd | Other services | 2025 |
| LE Property Investment Limited | Real estate | 2010 |
| LE RAJ Spice Limited | Hospitality | 2026 |
| LE Rinco Global Ltd | Wholesale & retail | 2023 |
| LE Vacherin Ltd | Hospitality | 2019 |
| LEA Wood Edge (Management Company) Limited | Households | 2007 |
| Leach and Burton Limited | Wholesale & retail | 1988 |