| LA Hanc Projects Ltd | Construction | 2026 |
| Laala's Distribution Ltd | Wholesale & retail | 2019 |
| Lab-Chem Limited | Wholesale & retail | 1982 |
| Labaldi Logistics Ltd | Wholesale & retail | 2024 |
| Lahori Nihari Catering Ltd | Hospitality | 2025 |
| Laila's Montessori Limited | Education | 2016 |
| Lals Fibre Solutions Limited | Information & communication | 2024 |
| Lamar Property Ltd | Real estate | 2021 |
| Lampo Cleaning Services Ltd | Wholesale & retail | 2018 |
| Lance Hobbs HR Limited | Professional & scientific | 2017 |
| Land Home Properties Limited | Professional & scientific | 2007 |
| Land of P Ltd | Households | 2025 |
| Landau Morley LLP | | 2007 |
| Landau Morley Registrars Limited | Professional & scientific | 1969 |
| Landcair Limited | Households | 2026 |
| Langdale Gardens Ltd | Real estate | 2022 |
| Langley Haven Care Home Ltd | Health & social care | 2010 |
| Lanka Express Ltd | Transport & logistics | 2024 |
| Lanyah Medical Services Limited | Administrative & support | 2014 |
| Lapeci Enterprises Ltd | Wholesale & retail | 2025 |
| LAR Investment Group Ltd | Real estate | 2024 |
| Lara & Kanzy Auto Repairs Ltd | Wholesale & retail | 2025 |
| Larry’S Jerkpit Ltd | Hospitality | 2024 |
| Lasem CIC | Administrative & support | 2026 |
| Lawford Heath Industrial Estate Ltd | Real estate | 2018 |
| Laxmi Dnds Legacy Ltd | Real estate | 2025 |
| Layalina Nuts Ltd | Wholesale & retail | 2022 |
| Layalina Properties Limited | Wholesale & retail | 2026 |
| LB Vala Constructions Limited | Construction | 2021 |
| Lbahr Property Investments Ltd | Real estate | 2025 |
| Lblbproductions Limited | Information & communication | 2023 |
| Lbttuk Ltd | Wholesale & retail | 2024 |
| LC Bryan Medical Couriers Ltd | Transport & logistics | 2021 |
| LDV Music Limited | Information & communication | 2012 |
| Lead Global DLS Ltd | Information & communication | 2019 |
| Leader CAD London Limited | Professional & scientific | 2008 |
| Learn Right Ltd | Other services | 2022 |
| Learning Link Group Ltd | Education | 2025 |
| Ledian Group Ltd | Construction | 2015 |
| Ledrop Exports Limited | Wholesale & retail | 1975 |
| LEE Beaumont Finance Limited | Professional & scientific | 2023 |
| Leegrade Limited | Wholesale & retail | 1984 |
| Legacy Car Group Ltd | Wholesale & retail | 2025 |
| Leicester JMD Limited | Real estate | 2019 |
| Leighton Tyres Ltd | Wholesale & retail | 2024 |
| Leiston Old Abbey Ltd | Health & social care | 2007 |
| Lens Neuro Ltd | Information & communication | 2025 |
| LEO and Aries Ltd | Wholesale & retail | 2026 |
| LEO VAL Properties Limited | Real estate | 2015 |
| Leorenzo Limited | Real estate | 2021 |
| Lesstek Carpentry Ltd | Construction | 2024 |
| Letco Traders Ltd | Wholesale & retail | 2025 |
| Letief Ltd | Information & communication | 2023 |
| Lets Jump London Ltd | Arts & recreation | 2019 |
| Levant Food Limited | Hospitality | 2020 |
| Level UP Driving Ltd | Education | 2026 |
| Lexa Care Ltd | Health & social care | 2023 |
| LGF Construction Ltd | Construction | 2025 |
| LGN Trading Ltd | Wholesale & retail | 2024 |
| Lgsd Limited | Manufacturing | 2024 |
| Lh&K Limited | Real estate | 2021 |
| LHM Superstore Ltd | Wholesale & retail | 2022 |
| Licklemor Productions Limited | Information & communication | 2009 |
| Lientsha International (PVT) Ltd | Wholesale & retail | 2025 |
| Lift Dezignz Ltd | Manufacturing | 2013 |
| Light Foundations | Administrative & support | 2018 |
| Lilly Gardens Ltd | Real estate | 2023 |
| Lime Court Investments Limited | Financial services | 1990 |
| Limecourt Finance and Investments Limited | Professional & scientific | 2012 |
| Limecourt Holdings Limited | Financial services | 2021 |
| Limecourt Ventures Limited | Financial services | 1995 |
| Limitx Holdings Limited | Financial services | 2025 |
| Lindsay Drive General Investment Company Limited | Real estate | 1972 |
| Linear Properties Limited | Real estate | 2010 |
| Linecord Limited | Real estate | 2005 |
| Link Asia Corporation Ltd | Financial services | 2017 |
| Link Host Ltd | Information & communication | 2020 |
| Linkcrest Limited | Construction | 2016 |
| Linkgain Limited | Administrative & support | 2016 |
| Lintel Limited | Real estate | 2019 |
| Lion Coffee Limited | Hospitality | 2026 |
| Lion Yellow Ltd | Wholesale & retail | 2018 |
| Lisan Publishers Ltd | Information & communication | 2022 |
| Lisbay Estates Limited | Real estate | 2022 |
| Lisfannon Ltd | Construction | 2020 |
| Little Bunnies Day Care Ltd | Other services | 2019 |
| Little China Devon Limited | Hospitality | 2016 |
| Little Grange Limited | Households | 1998 |
| Little Green Forest Day Nursery Ltd | Education | 2020 |
| Little Lotus London Limited | Wholesale & retail | 2021 |
| Little Luminaries Day Care Ltd | Education | 2025 |
| Little Orchard House Nursery Limited | Education | 2015 |
| Little Rock Properties Limited | Real estate | 2012 |
| Live Tech Global Limited | Administrative & support | 2021 |
| Livecast Software Limited | Information & communication | 2025 |
| Liviosiv Safety Limited | Professional & scientific | 2025 |
| LJM (London) Limited | Real estate | 2011 |
| Lloyds Impex Limited | Extraterritorial | 2025 |
| Lluxe Properties Ltd | Real estate | 2019 |
| LMB Installations Ltd | Construction | 2019 |