| Ladroma Endoscopy Services Limited | Health & social care | 2025 |
| Lafone Properties Limited | Real estate | 2018 |
| Lagrew Limited | Information & communication | 2020 |
| Lake Banana Limited | Professional & scientific | 2017 |
| Lakeside Printing Limited | Manufacturing | 1981 |
| Lakshmi Nagasai Limited | Information & communication | 2019 |
| Lalalu Designs Limited | Wholesale & retail | 2025 |
| Lambert & Foster (Bloomfields) Ltd | Professional & scientific | 2012 |
| Lambeth Plumbing & Heating Supplies Limited | Wholesale & retail | 2010 |
| Lambeth Spirits Ltd | Manufacturing | 2014 |
| Lambs Carpentry and Building Ltd | Construction | 2025 |
| Lamond Products Ltd | Administrative & support | 2008 |
| LAN Consulting Limited | Administrative & support | 2011 |
| Lance Developments Limited | Administrative & support | 2013 |
| Lancet Windows Ltd | Manufacturing | 2022 |
| Land Jordan Limited | Construction | 2006 |
| Landcade Limited | Construction | 2025 |
| Landlines 2U Limited | Information & communication | 2023 |
| Lanes Electrical Limited | Construction | 2025 |
| Langans Mayfair Limited | Hospitality | 2020 |
| Langdon Medical Services Ltd | Health & social care | 2020 |
| Langfax Limited | Construction | 1997 |
| Langham Estates Limited | Construction | 1973 |
| Langstock Ltd | Extraterritorial | 2016 |
| Langton Life Limited | Information & communication | 2013 |
| Lani Design Ltd | Professional & scientific | 2017 |
| Lanigan's Emporium Limited | Wholesale & retail | 2017 |
| Lara Caiulo Design Ltd | Professional & scientific | 2022 |
| Larchfield Group EOT Limited | Administrative & support | 2023 |
| Larchfield Group Limited | Administrative & support | 2013 |
| Larchfield Limited | Wholesale & retail | 1987 |
| Larchfield LSN Limited | Administrative & support | 2013 |
| Larchfield Technic Limited | Administrative & support | 2013 |
| Lark Products Ltd | Wholesale & retail | 2016 |
| Larkhall Lane Property Limited | Construction | 2018 |
| Larkin Enterprises Ltd | Administrative & support | 2003 |
| Larry Autos UK Limited | Wholesale & retail | 2023 |
| Lasa Impex Ltd | Wholesale & retail | 2025 |
| Laser Resale Limited | Manufacturing | 2007 |
| Latters Toll Farm Ltd | Agriculture & fishing | 2001 |
| Latymers Management Company Limited | Households | 1980 |
| Lauraloves Design Limited | Professional & scientific | 2018 |
| Laureltree Portfolio Ltd | Information & communication | 2017 |
| Lauren Barber Limited | Professional & scientific | 2009 |
| Lauren Mcgavin Limited | Professional & scientific | 2025 |
| Lavender Mews Management Company Limited | Households | 2009 |
| Laverstock Physiotherapy Limited | Health & social care | 2005 |
| Law House Management Company Limited | Households | 2025 |
| Lawnhopper (Kent) Limited | Administrative & support | 2021 |
| Lawrence Anaesthesia Ltd | Health & social care | 2019 |
| Lawson Education Ltd | Education | 2024 |
| Lawsons Mews Limited | Real estate | 1999 |
| Lawton Interim Management Limited | Professional & scientific | 2018 |
| Layr Robotics Ltd | Information & communication | 2026 |
| Lazarus Creative Ltd | Professional & scientific | 2022 |
| Lazy Cats Limited | Information & communication | 2006 |
| LB IT Consulting Ltd | Information & communication | 2024 |
| LBL Consultancy Services Ltd | Professional & scientific | 2022 |
| LC Roofing Contractors Limited | Construction | 2015 |
| LCS (South) Limited | Extraterritorial | 2012 |
| LCX Property Investment Ltd | Real estate | 2016 |
| LCX Property Management Ltd | Real estate | 2018 |
| LDN Medical Specialists Ltd | Health & social care | 2023 |
| Leach Construction Services Limited | Construction | 2003 |
| Leadsafe Consulting Ltd | Professional & scientific | 2020 |
| Leafy Indian Takeaway Limited | Hospitality | 2025 |
| Leanne Barry Consultants Limited | Professional & scientific | 2007 |
| Leaps and Bounds Advisory Services Ltd | Professional & scientific | 2021 |
| Lear Business Services Limited | Information & communication | 2008 |
| Learning Tree Tuition Ltd | Education | 2019 |
| Leathwaite Management Company Limited | Households | 2005 |
| Leaves and Flowers Limited | Wholesale & retail | 2019 |
| Leetec Hire and Sales Limited | Administrative & support | 2023 |
| Leetec Tool Hire Ltd | Administrative & support | 1978 |
| Legacy Lines Ltd | Professional & scientific | 2025 |
| Legal and Estate Limited | Real estate | 2019 |
| Leidon Consulting Ltd | Professional & scientific | 2019 |
| Leigh Layabouts RFC Ltd | Arts & recreation | 2022 |
| Leigh Layabouts Rugby Football Club Ltd | Real estate | 2012 |
| Leigh Tennis Club Limited | Arts & recreation | 1984 |
| Lemonlight LLP | | 2019 |
| LEO Rose Stanford Ltd | Extraterritorial | 2024 |
| Leon Beauty Limited | Other services | 2019 |
| Leonidas Consulting Limited | Real estate | 2001 |
| Lester Brown Ltd | Construction | 2015 |
| Letsby Avenue Productions Ltd | Information & communication | 2025 |
| Leviathan Systems Integration Limited | Information & communication | 2003 |
| Lewis Consulting Services Limited | Professional & scientific | 2019 |
| Lexit Limited | Professional & scientific | 2016 |
| Leyda Properties Ltd | Real estate | 2022 |
| Leyland Leaseholders Limited | Households | 2000 |
| Leyland Lodge Management Limited | Households | 2001 |
| Leylands Limited | Real estate | 2026 |
| LG Securities Ltd | Professional & scientific | 2016 |
| LGS Stables 10 Ltd | Agriculture & fishing | 2025 |
| Lhall Limited | Wholesale & retail | 2023 |
| Lhbg Ltd | Professional & scientific | 2012 |
| Liberating Currents Limited | Administrative & support | 2006 |
| Libertas 888 Ltd | Real estate | 2024 |
| Life Stream Limited | Real estate | 2005 |