| Legacy Property & Investments Limited | Real estate | 2025 |
| Lemsbury Global Ltd | Wholesale & retail | 2024 |
| Lendwise Capital UK Ltd | Financial services | 2026 |
| LEO Ventures and Coterie (LVC) Ltd | Real estate | 2024 |
| Leonard Enterprises Ltd | Arts & recreation | 2011 |
| Leopold UK Shopfronts Ltd | Manufacturing | 2011 |
| Leos Housing CIC | Real estate | 2025 |
| LES Cascades Limited | Hospitality | 2025 |
| Lewis Drylining Limited | Construction | 2024 |
| LG Sourcing Limited | Professional & scientific | 2025 |
| Licris Ltd | Real estate | 2024 |
| Life Care Instruments Limited | Wholesale & retail | 2022 |
| Life Circle Ltd | Administrative & support | 2015 |
| Life Fountain Property Ltd | Real estate | 2016 |
| Lifecease Ltd | Information & communication | 2025 |
| Lifematters Care Limited | Health & social care | 2020 |
| Lifestyle HT Limited | Real estate | 2021 |
| Lightfocus Ltd | Wholesale & retail | 2024 |
| Lighthouse Care Homes Ltd | Health & social care | 2024 |
| Lighting Customise Limited | Wholesale & retail | 2025 |
| Lils Carpentry Ltd | Construction | 2022 |
| Lime Care Ltd | Public administration | 2021 |
| Limitless Essex F.C Ltd | Arts & recreation | 2025 |
| Linda Constrtuction Ltd | Construction | 2020 |
| Link Star Business Limited | Professional & scientific | 2014 |
| Linked Agcy Ltd | Professional & scientific | 2024 |
| Litomo Ltd | Wholesale & retail | 2018 |
| Little BOW Photography Limited | Professional & scientific | 2024 |
| Little Sister Care Ltd | Health & social care | 2023 |
| Little Teddies Walderslade Ltd | Health & social care | 2025 |
| Lituanica UK Ltd | Wholesale & retail | 2003 |
| Living Joy Ltd | Other services | 2011 |
| Liyahmeerah Ltd | Health & social care | 2018 |
| Lizdar Childcare Service Limited | Health & social care | 2017 |
| LJ Aquisitions Ltd | Real estate | 2023 |
| LJW Holdings Limited | Real estate | 2018 |
| LKS Propco and Mortgages Limited | Real estate | 2026 |
| LKS Solutions Limited | Professional & scientific | 2018 |
| LLS4U Ltd. | Wholesale & retail | 2009 |
| LLW Consultancy Ltd | Information & communication | 2025 |
| LM & KD Limited | Health & social care | 2025 |
| Lmjf Electrical Ltd | Construction | 2009 |
| LNL Empire Ltd | Financial services | 2023 |
| Local Removals London Ltd | Transport & logistics | 2022 |
| Logistical Software Ltd | Information & communication | 2014 |
| Logistics Marshcom Ltd | Administrative & support | 2024 |
| Lohara Medical Ltd | Health & social care | 2024 |
| Loka Properties Limited | Real estate | 2023 |
| Lollyb Ltd | Health & social care | 2023 |
| London Academy of Security Limited | Administrative & support | 2024 |
| London AI Centre Ltd | Information & communication | 2025 |
| London and Essex Electrical Limited | Construction | 2019 |
| London Car Solution Ltd | Wholesale & retail | 2015 |
| London City Homes Limited | Real estate | 2021 |
| London City Storage Ltd | Transport & logistics | 2019 |
| London Duct Hygiene Ltd | Administrative & support | 2018 |
| London Education Hub Limited | Public administration | 2024 |
| London Emergency Electricals Ltd | Construction | 2024 |
| London Engines Limited | Wholesale & retail | 2017 |
| London Life in Care Limited | Health & social care | 2019 |
| London Malayala Sahithyavedi Ltd | Education | 2025 |
| London Motors PVT Ltd | Wholesale & retail | 2025 |
| London Professional Training Centre Ltd | Education | 2012 |
| London Riverside (BID) Limited | Other services | 2006 |
| London School of Academics Ltd | Education | 2010 |
| London Shopfitters Limited | Construction | 1995 |
| London Shopping and Services Limited | Wholesale & retail | 2020 |
| London Skip Fabrications Limited | Extraterritorial | 2020 |
| London Waste Technology Limited | Administrative & support | 2000 |
| Long Catlis Mechanical Services Limited | Professional & scientific | 2017 |
| Lots & Lots Limited | Wholesale & retail | 2026 |
| Love Choco Ltd | Hospitality | 2017 |
| Love Properties Group Ltd | Real estate | 2026 |
| Lovebounte Boutique Limited | Wholesale & retail | 2024 |
| LOW Cost Baling Limited | Manufacturing | 1996 |
| Lowo Limited | Administrative & support | 2022 |
| Lptc Solutions Ltd | Education | 2019 |
| LS Fire & Electrical Services Limited | Manufacturing | 2010 |
| LSF Commercial Limited | Extraterritorial | 2019 |
| LSS Contracts Ltd | Construction | 2010 |
| LT Buses Ltd | Administrative & support | 2025 |
| LT MOT Ltd | Wholesale & retail | 2015 |
| Luca Tiling Ltd | Construction | 2024 |
| Lucinda Shersby Property Company Ltd | Real estate | 2020 |
| Luckyjewellery Ltd | Wholesale & retail | 2025 |
| Ludovic Services Limited | Construction | 2025 |
| Lumaven Limited | Administrative & support | 2019 |
| Lummahbeauty Ltd | Other services | 2026 |
| Lunarova Ltd | Wholesale & retail | 2021 |
| Luraclean Ltd | Construction | 2019 |
| Lussoire Hair Ltd | Wholesale & retail | 2025 |
| Luthica Ltd | Wholesale & retail | 2025 |
| LUX Auto Ltd | Wholesale & retail | 2026 |
| Luxe Belle Ltd | Wholesale & retail | 2025 |
| Luxe Kitchen Interiors Ltd | Construction | 2025 |
| Luxe Memento Ltd | Manufacturing | 2020 |
| Luxefinity Ltd | Manufacturing | 2025 |
| Luxury Brands for Less Ltd | Wholesale & retail | 2021 |
| Lvco Ltd | Other services | 2023 |
| Lymens Limited | Health & social care | 2024 |