| Lindisfarne Properties Limited | Real estate | 2015 |
| Lindon Audit Services Limited | Professional & scientific | 2024 |
| Lindsman Properties (1800) Limited | Extraterritorial | 2009 |
| Lindsman Properties (1801) Limited | Extraterritorial | 2009 |
| Lindsman Properties (1804) Limited | Extraterritorial | 2011 |
| Lindsman Properties (1805) Limited | Extraterritorial | 2011 |
| Lindsman Properties (1806) Limited | Extraterritorial | 2011 |
| Lindsman Properties (1807) Limited | Extraterritorial | 2011 |
| Lindsman Properties (1813) Ltd | Extraterritorial | 2014 |
| Lindsman Properties (1816) Limited | Extraterritorial | 2015 |
| Lindsman Properties (1818) Limited | Extraterritorial | 2017 |
| Lindsman Properties (1819) Limited | Extraterritorial | 2017 |
| Lindsman Properties (1820) Limited | Extraterritorial | 2018 |
| Lindsman Properties (1823) Limited | Extraterritorial | 2018 |
| Linko Digital Limited | Information & communication | 2020 |
| Linkpax Limited | Transport & logistics | 2024 |
| Linksway Ltd | Real estate | 2024 |
| Linkway Group Limited | Transport & logistics | 2024 |
| Linmere Gateway Management Company Limited | Households | 2022 |
| Linmere Management Company Limited | Households | 2021 |
| Linnet Road Management Company Ltd | Real estate | 2021 |
| Lintel International Limited | Construction | 1988 |
| Lionheart Safety Systems Limited | Professional & scientific | 2018 |
| Lipoconstruct Ltd | Construction | 2024 |
| LIS Electric Ltd | Construction | 2024 |
| Lisa David Limited | Other services | 2011 |
| Little Cherry Limited | Wholesale & retail | 2025 |
| Little Explorers Hemel Ltd | Education | 2025 |
| Little Petherick Creek Management Company Limited | Other services | 2003 |
| Little Rushes Management Company Limited | Households | 2015 |
| Little Sprout Early Years Education and Childcare Ltd | Other services | 2023 |
| Little White Photography Ltd | Professional & scientific | 2020 |
| Littlebourne Media Services Ltd | Administrative & support | 2024 |
| Littlebrook (Cutbush Lane) Management Company Limited | Households | 2016 |
| Living Brands Ltd | Professional & scientific | 2007 |
| Living Proof Producer Limited | Wholesale & retail | 2024 |
| Living the Dream Group Ltd | Arts & recreation | 2018 |
| Liviutaga Limited | Manufacturing | 2018 |
| Livix Homes Ltd | Health & social care | 2023 |
| Lixxia London Ltd | Wholesale & retail | 2025 |
| LJ Contractors Ltd | Administrative & support | 2018 |
| LJ KAZ Limited | Arts & recreation | 2021 |
| LJ KAZ Properties Limited | Real estate | 2024 |
| LJ Medical Ltd | Health & social care | 2022 |
| LJ Property Ventures Ltd | Real estate | 2024 |
| LJ Rigging Limited | Transport & logistics | 2020 |
| LJ Sure Mercies Care Ltd | Health & social care | 2020 |
| LJC Homes Ltd | Real estate | 2023 |
| LJJ Estates Limited | Real estate | 2025 |
| LJS Elite Ltd | Professional & scientific | 2022 |
| LJS Personnel Limited | Administrative & support | 2020 |
| Llabjani Ltd | Professional & scientific | 2017 |
| Lloyds Lettings & Property Management Ltd | Real estate | 2020 |
| Lltp London Consult Invest Limited | Professional & scientific | 2018 |
| Llys Ystrad (Bridgend) Management Company Limited | Households | 2021 |
| Llys-Y-Mor Management Company Limited | Households | 2004 |
| LM Brown Roofing Ltd | Construction | 2026 |
| LM Ground Facilities Ltd | Construction | 2015 |
| LM New Homes Ltd | Construction | 2018 |
| LM Tiling Limited | Construction | 2012 |
| Lmdi Systems Ltd | Information & communication | 2016 |
| LMK Developments Limited | Construction | 2018 |
| LNS Solutions UK Ltd | Wholesale & retail | 2026 |
| Lock 67 Graphics Ltd | Manufacturing | 2017 |
| Lock Keeper's Gate (LOW Barugh) Management Company Limited | Households | 2018 |
| Lockers Park School Trust Limited | Education | 1973 |
| Lockmetal Limited | Construction | 2015 |
| Locksley Place Residents Management Company Limited | Households | 2017 |
| Lockwood Fields (Chidswell) Management Company Limited | Households | 2022 |
| Lode Media Ltd | Professional & scientific | 2026 |
| Loden Limited | Administrative & support | 2020 |
| Lodge Park Management Company Limited | Households | 2017 |
| Lodro UK Limited | Manufacturing | 2024 |
| Logislift Warehouse Systems Limited | Manufacturing | 2020 |
| Logistx Limited | Transport & logistics | 2008 |
| Londino Limited | Transport & logistics | 2016 |
| London Art Interior Ltd | Manufacturing | 2022 |
| London Athletic Football Ltd | Education | 2021 |
| London Bathroom Centre Limited | Wholesale & retail | 2026 |
| London Cigar Co Limited | Wholesale & retail | 2022 |
| London City Holdings Limited | Real estate | 2020 |
| London Flowerwall Company Limited | Wholesale & retail | 2017 |
| London Glass Partitions Ltd | Extraterritorial | 2018 |
| London Lifestyle Management Ltd | Administrative & support | 2014 |
| London Retail Manufacturing Limited | Manufacturing | 2017 |
| London Security Syndicate Ltd | Administrative & support | 2022 |
| London Square (Eastcote) Management Company Limited | Households | 2013 |
| London Square (Isleworth) Management Company Limited | Real estate | 2015 |
| London Square (Ruislip) Management Company Limited | Households | 2012 |
| London Square (Streatham Hill) Management Company Limited | Real estate | 2015 |
| London Trade & Consulting Limited | Wholesale & retail | 2019 |
| London Travel Services Ltd | Transport & logistics | 2026 |
| London Wharf E2 RTM Company Limited | Households | 2008 |
| London Wharf Freehold Limited | Real estate | 2015 |
| Lone ASH Developments Ltd | Construction | 2026 |
| Long Acre (Shinfield) Management Company Limited | Households | 2021 |
| Long Rail Ltd | Construction | 2021 |
| Longdean Park Investments Limited | Real estate | 2020 |
| Longfield Place (Sherfield) Management Company Limited | Households | 2022 |
| Longview Management Limited | Information & communication | 2015 |