| Lakhai Properties Ltd | Real estate | 2022 |
| Laksh Limited | Information & communication | 2007 |
| Lalitha ARI Limited | Administrative & support | 2025 |
| Lambrias Consulting Limited | Professional & scientific | 2014 |
| Lamin IT Limited | Information & communication | 2012 |
| Lamorak Estates Ltd | Real estate | 2024 |
| Lampwick Homes Limited | Administrative & support | 2024 |
| Lancam Care Services Limited | Health & social care | 2010 |
| Lancam Nursing Care Limited | Real estate | 2006 |
| Lancaster Avenue Consulting Ltd | Professional & scientific | 2015 |
| Lancaster Garage Limited | Wholesale & retail | 2014 |
| Lancaster Mews Flat Management Company Limited | Real estate | 1999 |
| Lancaster Place Management Company Limited | Other services | 2000 |
| Lancaster Secretarial Services Limited | Administrative & support | 2017 |
| Lance UK Properties LLP | | 2024 |
| Lancelot Estates Limited | Real estate | 2018 |
| Lancenorth Limited | | 1986 |
| Land Remediation Limited | Real estate | 1999 |
| Landfleet Limited | Real estate | 1986 |
| Landmark Recovery Ltd | Transport & logistics | 2026 |
| Landscapes + Ltd | Administrative & support | 2025 |
| Lane Associates Limited | Financial services | 2023 |
| Langcroft Capital Ltd | Real estate | 2024 |
| Langcroft Developments Ltd | Construction | 2024 |
| Langcroft Group Ltd | Financial services | 2024 |
| Langcroft Partnerships Limited | Administrative & support | 2024 |
| Langcroft(Pond Street) Ltd | Administrative & support | 2024 |
| Langorf Hotel Limited | Hospitality | 2018 |
| Lanrc Limited | Construction | 2017 |
| Lansdowne Nursery Limited | Agriculture & fishing | 1976 |
| Lanstow Holdings Ltd | Financial services | 2024 |
| Lapwing Living Ltd | Real estate | 2025 |
| Larchwood Barrowell Green Management Company Limited | Households | 2014 |
| Larossh Ltd | Real estate | 2013 |
| Larren (UK) Ltd | Wholesale & retail | 2015 |
| Laser Business Systems Limited | Information & communication | 1990 |
| Laser Quest Solutions Limited | Wholesale & retail | 2019 |
| Laserheights Limited | | 1990 |
| Lask Investments Limited | Real estate | 2025 |
| Lasku Decorators Ltd | Construction | 2016 |
| Lassa Building Control Ltd | Construction | 2024 |
| Last Minute Weddings Limited | Other services | 2006 |
| Latimer Contracts Ltd | Real estate | 2015 |
| Latingo Limited | Hospitality | 2023 |
| Latitude Mapping Limited | Wholesale & retail | 2007 |
| Launch Point Recruitment Ltd | Administrative & support | 2026 |
| Laura's Idea Ltd | Manufacturing | 2001 |
| Lauren Johnson Music Ltd | Arts & recreation | 2019 |
| Lauren Stock Psychology Ltd | Health & social care | 2021 |
| Laurence Slavin LLP | | 2019 |
| Lavanya Plus Limited | Information & communication | 2012 |
| Lawes Consulting Limited | Professional & scientific | 2002 |
| Lawless Lighting Limited | Information & communication | 2019 |
| Lawnswood Management Limited | Extraterritorial | 1992 |
| Lawrence House (Palmerston Road) Company Limited | Professional & scientific | 2005 |
| Lawton Connections Limited | Administrative & support | 2007 |
| Lawtons Properties Limited | Health & social care | 2024 |
| Laximi Spice & Lucky Limited | Hospitality | 2015 |
| LAZ Wellbeing Ltd | Other services | 2019 |
| LBF Consulting Ltd | Information & communication | 2017 |
| LBR Wellness Limited | Other services | 2024 |
| Lbuk Ltd | Wholesale & retail | 2014 |
| LBW Global Limited | Professional & scientific | 2019 |
| LC Accounting Limited | Professional & scientific | 2023 |
| LC Squared Electrical Contractors Ltd | Construction | 2018 |
| LC Squared Electricals UK Ltd | Construction | 2023 |
| Lconnect Limited | Professional & scientific | 2020 |
| LCS (Lancaster Corner Shop) Ltd | Wholesale & retail | 2022 |
| LE Grys Building Services Limited | Construction | 1977 |
| LE Jeune Chocolatiers LLP | | 2014 |
| LE Jeune London Limited | Wholesale & retail | 2015 |
| Leadwood Engineering Ltd | Construction | 2020 |
| Leafenvoy Limited | Real estate | 1983 |
| Leam Foods Ltd | Hospitality | 2023 |
| Lean DE Ltd | Professional & scientific | 2022 |
| Leanes Kitchens & Bedrooms (UK) Limited | Construction | 2013 |
| Leanne Mcdonnell Limited | Arts & recreation | 2018 |
| Learnilo Ltd | Information & communication | 2022 |
| Learnit.Ai Ltd | Information & communication | 2017 |
| Leatherhead Properties Limited | Real estate | 2002 |
| Leathertrove Ltd | Wholesale & retail | 2011 |
| LEB GAS & Plumbing Ltd | Construction | 2025 |
| LEC Serve Limited | Construction | 2005 |
| Lecam Limited | Information & communication | 2025 |
| Leche Delivery Solutions Limited | Transport & logistics | 2023 |
| Leda Estates Limited | Households | 2023 |
| Lederman Therapy Limited | Health & social care | 2007 |
| LEE Lets Ltd | Real estate | 2020 |
| Leeliang Ltd | Professional & scientific | 2019 |
| Lees Architects LLP | | 2020 |
| Leez Priory Limited | Administrative & support | 2023 |
| Legacy Hub Ltd | Real estate | 2023 |
| Legacy Inc Limited | Real estate | 2019 |
| Legacy Legal Limited | Financial services | 2013 |
| Legal Medical Assist Limited | Health & social care | 2020 |
| Leicester Capital Limited | Professional & scientific | 2011 |
| Leicester HC Capital Ltd | Hospitality | 2025 |
| Leigh Mill Ltd | Arts & recreation | 2023 |
| Leigh Road (7-9) Management Limited | Households | 1995 |
| Leila Properties Limited | Real estate | 2016 |