| Lereka Consultancy Ltd | Information & communication | 2016 |
| Lereka Facility Limited | Construction | 2020 |
| Lereka Services Limited | Information & communication | 2015 |
| Leroy Healthcare Ltd | Health & social care | 2018 |
| Less Stress More Energy Ltd | Professional & scientific | 2019 |
| LET ME Know Ltd | Information & communication | 2022 |
| Leticia Restaurant Ltd | Hospitality | 2026 |
| Lets Go Waste Broker Ltd | Water & waste | 2026 |
| Lets Just DO IT Limited | Information & communication | 2000 |
| Letterbox Media Limited | Professional & scientific | 2015 |
| LEV Business Services Ltd | Professional & scientific | 2024 |
| Levels Education Group Ltd | Arts & recreation | 2018 |
| Levo Lifts Limited | Transport & logistics | 2023 |
| Lewin Studios Ltd | Information & communication | 2022 |
| Lexaura Mediation & Legal Support Ltd | Professional & scientific | 2025 |
| Lexpert AI Ltd | Information & communication | 2023 |
| Lexpoint Limited | Professional & scientific | 2025 |
| LFT Fire Systems Ltd | Construction | 2024 |
| LGO Medics Limited | Real estate | 2015 |
| LI and MA Company Limited | Professional & scientific | 2020 |
| Liam Karabelov Motorsport Ltd | Professional & scientific | 2025 |
| Lianou Chalvatzis Ltd | Professional & scientific | 2014 |
| Liberty Oriental Carpets Limited | Wholesale & retail | 2007 |
| Liberty Furniture Limited | Wholesale & retail | 2012 |
| Liberty Property Developments Ltd | Construction | 2015 |
| LIBERTY4U Ltd | Transport & logistics | 2018 |
| Libra Fire Ltd | Construction | 2022 |
| Lieux Dits Ltd | Wholesale & retail | 2025 |
| Life Formula Vitamins Ltd | Wholesale & retail | 2025 |
| Lifeline Estates Ltd | Real estate | 2025 |
| Lifeline Medics Ltd | Health & social care | 2013 |
| Lifestyle PTD Limited | Real estate | 2023 |
| Light IT UP Electrical Ltd | Construction | 2021 |
| Lighthouse GRC Limited | Administrative & support | 2022 |
| Lika Reinforcement Ltd | Construction | 2024 |
| Likad Global Ltd | Professional & scientific | 2007 |
| Lilley Sports International Ltd | Wholesale & retail | 2025 |
| Limelumen London Ltd | Wholesale & retail | 2013 |
| Limeoak Construction Limited | Manufacturing | 2019 |
| Limitless Colours Ltd | Construction | 2022 |
| Limitless Creations Ltd | Construction | 2013 |
| Limje Holdings Limited | Professional & scientific | 1996 |
| Limje Industrial Limited | Administrative & support | 1990 |
| Linasa United Limited | Other services | 2025 |
| Lind Road Management Company Limited | Households | 2001 |
| Linden Dining Ltd | Hospitality | 2021 |
| Linden Invest Ltd | Real estate | 2026 |
| Lindenwood Global Limited | Wholesale & retail | 2026 |
| Linen Essentials Limited | Wholesale & retail | 2019 |
| Linesa Apparel Solutions Limited | Wholesale & retail | 2025 |
| Lingfield Chauffeurs Limited | Transport & logistics | 2025 |
| Lingo Hub Ltd | Professional & scientific | 2017 |
| Linguamedia Ltd | Other services | 2016 |
| Linguaphone Group Limited | Education | 2006 |
| Linguaphone Institute Limited | Education | 2009 |
| Linguaplay Advanced Limited | Education | 2022 |
| Liniko Ltd | Construction | 2021 |
| Linji Lotus Media Limited | Professional & scientific | 2025 |
| Linnetts Proofing Limited | Manufacturing | 2008 |
| Lion (London) Limited | Hospitality | 2003 |
| Lion Admin Solutions Ltd | Administrative & support | 2022 |
| Lion Downs Equestrian UK Limited | Agriculture & fishing | 2026 |
| Lion EYE Management Ltd | Professional & scientific | 2023 |
| Liquorish Developments Ltd | Construction | 2024 |
| Lisa Bidessie Ltd | Education | 2026 |
| Lisenair Limited | Professional & scientific | 2010 |
| Little Ambassadors Ltd | Education | 2024 |
| Little Barkery Ltd | Wholesale & retail | 2024 |
| Little Forest Schools Ltd | Education | 2014 |
| Little Lights Educational Services Ltd | Education | 2008 |
| Little Lotus Haven Limited | Other services | 2025 |
| Little Nyonya Ltd | Hospitality | 2023 |
| Little Wren Corporate Finance Limited | Professional & scientific | 2026 |
| Littleton Consulting Limited | Professional & scientific | 2014 |
| LIV Art Ltd | Professional & scientific | 2009 |
| LIZ Ralph Ltd | Professional & scientific | 2023 |
| LJ Hardware Ltd | Wholesale & retail | 2025 |
| LJ Inc Ltd | Health & social care | 2012 |
| LJR Electrical Limited | Construction | 2012 |
| LJS Trading Limited | Hospitality | 2021 |
| LK Saha Ltd. | Administrative & support | 2017 |
| LL Brickwork & Scaffolding Ltd | Construction | 2018 |
| Llmings Ltd | Information & communication | 2023 |
| LLY Property Finance Ltd | Real estate | 2025 |
| LM Metal Design Limited | Health & social care | 2012 |
| LMA 11 Limited | Construction | 2026 |
| LMJ Glazing Limited | Construction | 2024 |
| LMK Plumbing and Heating Ltd | Construction | 2023 |
| LNH Properties Ltd | Real estate | 2011 |
| Lobo Home Solutions Ltd | Construction | 2025 |
| Lobos Barnet Snowwhite Real Estate Investments Limited | Real estate | 2020 |
| Local Steel Limited | Manufacturing | 2023 |
| Local Steels Structural Ltd | Manufacturing | 2025 |
| Lockie Cameras Limited | Information & communication | 2025 |
| Locum Services of the UK Limited | Administrative & support | 2009 |
| Lodare Ltd | Professional & scientific | 2016 |
| Lofts of London Limited | Construction | 2019 |
| Logiblocs Limited | Professional & scientific | 2018 |
| Logiclink Systems Ltd | Information & communication | 2024 |
| Logue Maintenance Services Ltd | Construction | 2024 |