| Lmra Trustee Limited | Professional & scientific | 2019 |
| Loadlogic Solutions Ltd | Professional & scientific | 2024 |
| Lobb + Partners Limited | Professional & scientific | 2016 |
| Lobster Stew Limited | Information & communication | 2009 |
| Local Events & Festivals Ltd | Arts & recreation | 2024 |
| Local Halal Meat and Groceries Ltd | Wholesale & retail | 2023 |
| Local Tutor Limited | Education | 2016 |
| Localpulse Care Ltd | Health & social care | 2026 |
| Lockley Andrews Limited | Construction | 2008 |
| Locksmith 247 ALL Services Ltd | Construction | 2017 |
| Lodge Motor Company Limited | Wholesale & retail | 2002 |
| Lodgeford Homes UK Limited | Construction | 2011 |
| Logicterm Limited | Hospitality | 1990 |
| Lombera Consulting Limited | Professional & scientific | 2019 |
| London & Bookham Properties Limited | Manufacturing | 1996 |
| London & European Mercantile Limited | Construction | 1999 |
| London & Surrey Motors Ltd | Wholesale & retail | 2024 |
| London Christmas Tree Rental Limited | Agriculture & fishing | 2020 |
| London Durgotsav Comm Limited | Education | 2020 |
| London Durgotsav Committee Ltd | Other services | 2016 |
| London Image Creative Limited | Information & communication | 2012 |
| London Mayfair Holdings Ltd | Real estate | 2015 |
| London Publisher Limited | Information & communication | 2025 |
| London Road Retail Limited | Wholesale & retail | 2015 |
| London Steel Surgery Ltd | Construction | 2018 |
| London Tourist Coach Operators Association Limited | Transport & logistics | 2020 |
| London Transport Flying Club Limited | Education | 1991 |
| Londonposer Ltd | Wholesale & retail | 2024 |
| Long Hill Ltd | Construction | 2024 |
| Longcross Landscapes Limited | Administrative & support | 2018 |
| Longcross Studios Limited | Information & communication | 2016 |
| Longlands Findern Management Company Limited | Other services | 2009 |
| Lonsdale Property Investments Ltd | Real estate | 2016 |
| Loomi Ventures Ltd | Professional & scientific | 2025 |
| Loop Edit Ltd | Information & communication | 2017 |
| Loosplat.Com Limited | Information & communication | 2012 |
| Lopes Gardens Maintenance Ltd | Administrative & support | 2013 |
| Lorem Activewear Limited | Wholesale & retail | 2016 |
| Lorenc Properties Ltd | Real estate | 2023 |
| Lorna Doone Dental Limited | Health & social care | 2018 |
| Loti Leisure Limited | Hospitality | 2025 |
| Lotus Womens Health Ltd | Health & social care | 2017 |
| Lotz’N’Lotz Limited | Wholesale & retail | 2022 |
| LOU by Design Luxury and Wellness Travel Limited | Administrative & support | 2025 |
| Louise Head Lewinton Limited | Other services | 1982 |
| Love to Serve Ltd | Hospitality | 2021 |
| Loving Pilates Limited | Health & social care | 2015 |
| LOW Voltage Systems Limited | Construction | 2007 |
| LRJ Installation Services Limited | Professional & scientific | 2012 |
| Lsgardens Ltd | Administrative & support | 2025 |
| Lspeh Ltd | Financial services | 2026 |
| Lubao UK Limited | Wholesale & retail | 2023 |
| Lucas Green Yard Limited | Real estate | 2021 |
| Lucian & DDY Ltd | Wholesale & retail | 2026 |
| Luciant Ltd | Professional & scientific | 2020 |
| Lucid Healthcare PVT Ltd | Health & social care | 2017 |
| Lucky Great Independent Traders (UK) Ltd | Professional & scientific | 2025 |
| Lucky Sumon Systems Limited | Information & communication | 2019 |
| Lucra Marketing Ltd | Information & communication | 2025 |
| Lucy Kidd Consulting Ltd | Professional & scientific | 2021 |
| Ludlam Construction Ltd | Construction | 2020 |
| Luis Home Repairs Ltd | Manufacturing | 2022 |
| Luka Scaff&Build Services Ltd | Construction | 2026 |
| Lukas Pindaczek Ltd | Transport & logistics | 2023 |
| Luksow Limited | Health & social care | 2018 |
| Lulu Automotive Ltd | Wholesale & retail | 2024 |
| Lumber-Jacks Tree Services Ltd | Agriculture & fishing | 2019 |
| Lumina Store Ltd | Information & communication | 2025 |
| Luminance Pro Lighting Systems Limited | Construction | 2004 |
| Luminous Interiors Ltd | Construction | 2023 |
| Lumio Labs Limited | Information & communication | 2026 |
| Lumni Limited | Professional & scientific | 2011 |
| Lunar Homes Limited | Real estate | 2019 |
| Lung Health Surrey Limited | Health & social care | 2020 |
| LUP Trans Ltd | Transport & logistics | 2026 |
| Lusitan Limited | Manufacturing | 2016 |
| Lusso Electrical Ltd | Construction | 2025 |
| Lusso SPV3 LLP | | 2012 |
| Lustrecut Wheels Ltd | Wholesale & retail | 2026 |
| Lutidine Cottages Limited | Real estate | 2017 |
| LUTON200 Ltd | Administrative & support | 2019 |
| Luvisof Learning Limited | Information & communication | 2020 |
| Luxcessity Ltd | Wholesale & retail | 2020 |
| Luxe Muse Ltd | Wholesale & retail | 2025 |
| Luxe Property Group LPG Ltd | Real estate | 2024 |
| Luxury Excellence Limited | Information & communication | 2013 |
| LW Retail Limited | Wholesale & retail | 2024 |
| Lychwood Ltd | Financial services | 2024 |
| Lynbourn Associates Limited | Professional & scientific | 2018 |
| Lynch Properties Ltd | Real estate | 2011 |
| Lyndale Commercial Properties Limited | Real estate | 2004 |
| Lyndon Bird Limited | Information & communication | 1988 |
| Lyndsell House Securities Limited | Construction | 1993 |
| Lyne Properties LLP | | 2018 |
| Lyons and Company Conveyancing LLP | | 2009 |
| Lystro Ltd | Wholesale & retail | 2025 |
| LZA Limited | Health & social care | 2024 |
| M & W Electrical Services Limited | Construction | 2023 |
| M Architecture + Planning Ltd | Professional & scientific | 2016 |
| M Bloomfield Ltd | Construction | 2013 |