| Lakeside Oils Holdings Limited | Financial services | 2023 |
| Lakeside Oils Limited | Wholesale & retail | 2010 |
| Lakeside Oils Trustee Limited | Extraterritorial | 2026 |
| Lakshana Consulting Limited | Information & communication | 2026 |
| Lakshana Homes Ltd | Real estate | 2020 |
| Laleham Court (Romford) Ltd | Real estate | 2019 |
| Lalico Coffee Limited | Wholesale & retail | 2019 |
| Lalu London Limited | Manufacturing | 2024 |
| Lamb Hedgerow Publishing Limited | Information & communication | 2023 |
| Lambourne Hall Investments Limited | Real estate | 2023 |
| Lamcote Advisory Limited | Administrative & support | 2022 |
| Lampyris Media Limited | Professional & scientific | 2009 |
| Lance James the Jewellers Ltd | Manufacturing | 2004 |
| Land Charter (Brentwood) Limited | Construction | 2012 |
| Land Charter (Chelmsford) LLP | | 2013 |
| Land in Motion Limited | Real estate | 2025 |
| Land Secretaries Limited | Administrative & support | 1998 |
| Landlord's Safety Certificates (Eicr) Ltd | Construction | 2025 |
| Landmark (Nottingham) Ltd | Real estate | 2013 |
| Landscapers Essex Ltd | Construction | 2025 |
| Landseer Limited | Agriculture & fishing | 1994 |
| Landview Estate Ltd | Households | 2024 |
| Langdon Aluminium Limited | Manufacturing | 2020 |
| Langley Prestige Limited | Wholesale & retail | 2017 |
| Languages for Business Ltd | Education | 2024 |
| Lani Builders Ltd | Construction | 2019 |
| Lanifun Ltd | Wholesale & retail | 2025 |
| Lannik Limited | Real estate | 2020 |
| Lansgrove Group Limited | Administrative & support | 2014 |
| Lansgrove London Limited | Construction | 2023 |
| LAP Architects and Interior Designers Limited | Professional & scientific | 2000 |
| Larabella Beauty Limited | Other services | 2025 |
| Laraim Sushi Limited | Hospitality | 2025 |
| Lares Capital Ltd | Real estate | 2021 |
| Lares Consulting Ltd | Professional & scientific | 2025 |
| Lares Services Limited | Administrative & support | 2018 |
| Larkhouse Investments Limited | Health & social care | 2010 |
| Larks Place Apartments Management Company Limited | Households | 2026 |
| Larmar Properties Limited | Construction | 2020 |
| Laser Electrical (Properties) Limited | Real estate | 2006 |
| Laser Electrical Services EOT Limited | Administrative & support | 2019 |
| Laser Electrical Services Limited | Construction | 1998 |
| Laser Innovations Limited | Manufacturing | 2004 |
| Laserline Dies Limited | Manufacturing | 1987 |
| Lash Envy by Maya Ltd | Other services | 2023 |
| Lashin Medical Services Ltd | Health & social care | 2022 |
| Lashon Limited | Information & communication | 2026 |
| Lashya Properties Limited | Real estate | 2021 |
| Latchingdon Garage Limited | Wholesale & retail | 2003 |
| Lathesound Properties (Number 2) Limited | Real estate | 1991 |
| Lattice Consult Limited | Administrative & support | 2014 |
| LAU Investments Limited | Real estate | 2022 |
| Laughton Real Estate Limited | Real estate | 2026 |
| Laureate Fields Residents Management Company Limited | Households | 2019 |
| Laurence Fidler Limited | Wholesale & retail | 2008 |
| Laurence Philippe Wines Limited | Manufacturing | 1981 |
| Lauson Consultancy Services Ltd | Professional & scientific | 2018 |
| Lauson Technology Services Ltd | Professional & scientific | 2026 |
| Lavenham FEN Farms Limited | Agriculture & fishing | 1955 |
| Lawford House Pool Limited | Arts & recreation | 2019 |
| Lawns (East Hanningfield) Management Company Limited(The) | Households | 1983 |
| Lawrence Atkinson Consultants (Laco.) Ltd | Professional & scientific | 2024 |
| Lawvia Ltd | Information & communication | 2025 |
| Laxmi Investment Holdings Limited | Real estate | 2021 |
| Laxmi Properties Holdings Limited | Construction | 2022 |
| Layla Anna - LEE Limited | Information & communication | 2012 |
| Layton Train Ltd | Financial services | 2001 |
| Lazer DIG Ltd | Administrative & support | 2018 |
| Lazer Restoration Ltd | Construction | 2026 |
| Laztech Ltd | Information & communication | 2024 |
| LB Bakery Ltd | Manufacturing | 2021 |
| LB Cleaning Services Contracts Limited | Administrative & support | 2019 |
| LB Financial Solutions Limited | Professional & scientific | 2012 |
| LB Powerfit Limited | Other services | 2017 |
| LB Renovations Ltd | Real estate | 2020 |
| LBD Units Ltd | Manufacturing | 2008 |
| Lbma Limited | Education | 2019 |
| LBR Building Contractors Limited | Construction | 2019 |
| LBR Civils Ltd | Construction | 2019 |
| LBU Solutions Limited | Administrative & support | 2014 |
| LC Beauty Cabin Ltd | Other services | 2019 |
| LC Consulting Group Ltd | Information & communication | 2019 |
| LC Godalming Limited | Construction | 2018 |
| LC Mellon (Development) Limited | Construction | 2019 |
| LC Mellon Limited | Construction | 2018 |
| Lcfh Limited | Professional & scientific | 2014 |
| LCH Property Management Limited | Real estate | 2004 |
| LCH Rentals Limited | Real estate | 2014 |
| LCM Modular Limited | Construction | 2012 |
| LCN Holding Limited | Financial services | 2024 |
| LCN Ventures Ltd | Information & communication | 2024 |
| Lcuk Chelmsford Limited | Other services | 2019 |
| Lcuk Holco Limited | Other services | 2017 |
| LDB Consultancy Ltd | Professional & scientific | 2007 |
| LDB Developments Ltd | Construction | 2016 |
| LE9H Ltd | Real estate | 2024 |
| Leadenhall Management Company Ltd | Administrative & support | 2014 |
| Leadfair Ltd | Wholesale & retail | 2013 |
| Leading Edge Capital International Limited | Real estate | 2017 |
| League Lions Residential Limited | Real estate | 2022 |