| LE Ballon Rouge Limited | Education | 2002 |
| LE Consultancy Services Limited | Information & communication | 2016 |
| LE Mare Consultancy Limited | Professional & scientific | 2020 |
| LE Mirage (Saffron Walden) Limited | Other services | 2013 |
| LEA Road (Dronfield) Management Company Limited | Households | 2022 |
| Lead Fifty Ltd | Professional & scientific | 2018 |
| Leaf Living Propco Two Ltd | Real estate | 2023 |
| Lean Holdings Limited | Extraterritorial | 2006 |
| Learn 2 Weld Ltd | Education | 2024 |
| LEE LEE Food Ltd | Hospitality | 2026 |
| LEE Rush Medical Ltd | Health & social care | 2022 |
| Leelaki Locums Ltd | Professional & scientific | 2017 |
| Leen Health Ltd | Hospitality | 2026 |
| Left Coast Consulting Ltd | Information & communication | 2023 |
| Legacy Tiling and Mastic Ltd | Construction | 2025 |
| Legal AID Mediation Ltd | Administrative & support | 2025 |
| Legal Media Monitor Limited | Professional & scientific | 2005 |
| Legal-On-Sea Ltd | Professional & scientific | 2022 |
| Legends of Liquor Ltd | Hospitality | 2026 |
| Leggatt Construction and Maintenance Ltd | Construction | 2016 |
| Legra Residential Ltd | Other services | 2019 |
| Leigh Auto Electrics Ltd | Wholesale & retail | 2020 |
| Leigh Bathroom Centre Limited | Wholesale & retail | 2006 |
| Leigh Construction (Essex) Ltd | Construction | 2020 |
| Leigh Heath Court Freehold Company Limited | Households | 2015 |
| Leigh Lofts Limited | Construction | 2014 |
| Leigh Mouldings Limited | Manufacturing | 2009 |
| Leigh Residential Limited | Real estate | 2017 |
| Leigh-On-Sea Cockles Limited | Administrative & support | 2015 |
| Leighton Property Management Limited | Households | 2005 |
| Leisure Properties Limited | Other services | 2009 |
| Leli Homes Limited | Real estate | 2026 |
| Lemon Holdings Limited | Financial services | 2026 |
| Lemon Leads Agency Ltd | Information & communication | 2024 |
| Leonards Serviced Accommodation Ltd | Hospitality | 2025 |
| Leopard Catering Limited | Hospitality | 1994 |
| Lern Holdings Limited | Real estate | 2019 |
| Lescott Limited | Professional & scientific | 2012 |
| Leslie B. Holmes (Securities) Limited | Financial services | 1949 |
| Lets Direct Limited | Real estate | 2013 |
| Levelling UP Consultancy Limited | Professional & scientific | 2024 |
| Levello Limited | Manufacturing | 2003 |
| Lewintons Ltd | Construction | 2026 |
| Lewis Timber Frames Limited | Construction | 2003 |
| Lexium Kane Ltd | Real estate | 2025 |
| Lexops Limited | Administrative & support | 2025 |
| LEY Away Apartments Ltd | Real estate | 2017 |
| Leyli Limited | Hospitality | 2020 |
| LGL Homes Limited | Real estate | 2021 |
| LGS Risk Management Ltd | Information & communication | 2025 |
| Libertech Consultants Limited | Professional & scientific | 2018 |
| Liberty Hygiene Limited | Other services | 2006 |
| Libra Interior Design Limited | Professional & scientific | 2014 |
| Life Space Regis Limited | Extraterritorial | 1998 |
| LIFT4SHIFT Ltd | Transport & logistics | 2026 |
| Light (Ashford) Management Company Limited | Households | 2015 |
| Light Trend Worldwide Limited | Wholesale & retail | 2024 |
| Liha Allied Health Limited | Health & social care | 2016 |
| Lilac Villas Limited | Real estate | 2026 |
| Lilyteeshealthcare Limited | Public administration | 2023 |
| Lilywhite Lane Ltd | Professional & scientific | 2019 |
| Limewood Grange (Fair Oak) Management Company Limited | Households | 2018 |
| Limitless Hospitality Ltd | Arts & recreation | 2021 |
| Limpms. Ltd | Information & communication | 2025 |
| Linda's Cafe Southend Ltd | Hospitality | 2015 |
| Lindley Moor Meadows (Huddersfield) Management Company Limited | Households | 2018 |
| Lindridge Building Company Ltd | Construction | 2010 |
| Linkflat Limited | Extraterritorial | 2005 |
| Lion Wharf (Isleworth) Management Company Limited | Households | 2017 |
| Lisa Cooper Limited | Education | 2016 |
| Lisa Orfali Ltd | Other services | 2021 |
| Lithra Enterprise Ltd | Wholesale & retail | 2025 |
| Lito Gels Limited | Wholesale & retail | 2025 |
| Little Balloon Company Ltd | Manufacturing | 2023 |
| Little Bath Shop Limited | Construction | 2010 |
| Little BOO Limited | Professional & scientific | 2007 |
| Little BOO Properties Limited | Real estate | 2010 |
| Little Eatali Limited | Hospitality | 2025 |
| Little Feathered Nest Ltd | Wholesale & retail | 2021 |
| Little Rebel Productions Limited | Arts & recreation | 2015 |
| Little Superstars Limited | Education | 2022 |
| Livedata Limited | Information & communication | 2020 |
| Livefloww Technologies Ltd | Information & communication | 2024 |
| Liverpool Mobile & Electronics UK Ltd | Wholesale & retail | 2023 |
| LIZ Nugent Limited | Financial services | 2023 |
| Lizzyco Limited | Real estate | 2024 |
| LJB Medical Secretarial Services Ltd | Administrative & support | 2023 |
| LJF Services Ltd | Public administration | 2021 |
| LL Home Improvements Limited | Construction | 2026 |
| LMG Private Ltd | Health & social care | 2025 |
| LMW Law Limited | Professional & scientific | 2021 |
| LO Clearance Limited | Water & waste | 2022 |
| Loaded Chocolate Factory Ltd | Manufacturing | 2025 |
| Loaded Chocolates Ltd | Other services | 2022 |
| LOAN2DAY Ltd | Financial services | 2008 |
| Lock & Key Centre Limited | Manufacturing | 2015 |
| Lockey's Automotive Repair Limited | Wholesale & retail | 2020 |
| Lodgehall Limited | Real estate | 2006 |
| Loft Studios Photography Limited | Professional & scientific | 2021 |
| LOG H Network Limited | Information & communication | 2024 |