| Lima Charlie Aviation Limited | Transport & logistics | 2020 |
| Lime Trees Residents Association Community Interest Company | Administrative & support | 2013 |
| Limekiln Estate Limited | Hospitality | 2023 |
| Limestone AGE Limited | Wholesale & retail | 2005 |
| Limestone Holdings Limited | Financial services | 2026 |
| Limitless Property Ltd | Real estate | 2020 |
| Limitless Short Stays Ltd | Real estate | 2023 |
| Lindbergh Limited | Administrative & support | 2012 |
| Lindbergh Property Ltd | Real estate | 2024 |
| Linnaeus Enterprises Ltd | Professional & scientific | 2011 |
| Lion Assets Ltd | Real estate | 2000 |
| Liquid Fashion House Ltd | Wholesale & retail | 2023 |
| Liquidity Finance Consulting Limited | Professional & scientific | 2014 |
| Lisa Bond Marketing Ltd | Professional & scientific | 2023 |
| Little Anne Property Company Limited(The) | Real estate | 1973 |
| Little Barn Nursery Ltd | Health & social care | 2025 |
| Little Orchard Developments Limited | Administrative & support | 2009 |
| Little Spoon Jewellery Limited | Wholesale & retail | 2026 |
| Little Whale Media Ltd | Information & communication | 2016 |
| Littleton Drew Gardens Limited | Real estate | 2022 |
| Live & Shine Care Solutions Ltd | Health & social care | 2025 |
| Live IT Fulfil IT Ltd | Professional & scientific | 2024 |
| Live@Thelamb Ltd | Hospitality | 2024 |
| Livequestrian Limited | Extraterritorial | 2012 |
| LIZ Banister Ltd | Professional & scientific | 2014 |
| LJS Financial Limited | Wholesale & retail | 2022 |
| LJW (2015) Limited | Administrative & support | 2015 |
| LK Residential Property Holdings Ltd | Real estate | 2024 |
| Lkrattinger Sporthorses Limited | Agriculture & fishing | 2025 |
| Llama Fair Trade Ltd | Wholesale & retail | 2008 |
| Llanddewi Construction Ltd | Construction | 2022 |
| LLK Studio Ltd | Other services | 2026 |
| LMP Consulting Ltd | Information & communication | 2026 |
| Loaded Gunn Limited | Manufacturing | 2001 |
| Local Lease Limited | Administrative & support | 2022 |
| Localoutlines Limited | Wholesale & retail | 2018 |
| Locals Club Ltd | Hospitality | 2020 |
| Lock-Strike Auto Locksmiths Ltd | Manufacturing | 2025 |
| Locksmart Limited | Construction | 2010 |
| Loco Labs Ltd | Administrative & support | 2026 |
| Lodge Farm Nursery School Limited | Education | 2000 |
| Loellaby Limited | Wholesale & retail | 2017 |
| Logicall Wireless Solutions Limited | Professional & scientific | 2014 |
| Lojik Transport Ltd | Transport & logistics | 2025 |
| London & Economic Properties Limited | Real estate | 1959 |
| London & Wiltshire Ltd | Real estate | 2021 |
| London & Wiltshire NO. 1 Ltd | Financial services | 2022 |
| London and Counties Holdings Ltd | Real estate | 2020 |
| London Joinery Limited | Manufacturing | 2013 |
| London Road Leisure Limited | Hospitality | 2021 |
| London School of Journalism Limited | Education | 2016 |
| Long Reach Homes Limited | Real estate | 2003 |
| Long ST Consulting Ltd | Professional & scientific | 2026 |
| Longview Partnership Ltd | Hospitality | 2023 |
| Lordfino Company Limited | Construction | 2012 |
| Lorika Business Solutions Ltd | Information & communication | 2002 |
| Lornebarrow Ltd | Professional & scientific | 2025 |
| Louise Carver Consulting Ltd | Professional & scientific | 2009 |
| Love Vivid Ltd | Professional & scientific | 2026 |
| Lovelywash Laundry Company Ltd | Other services | 2021 |
| Lovett Developments Ltd | Real estate | 2024 |
| Lowdells Ltd | Information & communication | 2023 |
| Lower Court Farm Limited | Real estate | 2004 |
| Lowrey Palmer Electrical Limited | Construction | 2016 |
| Loxwell Holdings Limited | Financial services | 2023 |
| LPA Drylining Ltd | Construction | 2023 |
| Lpassa Limited | Hospitality | 2026 |
| LRA Design Ltd | Professional & scientific | 2023 |
| LRM Property Development Ltd | Real estate | 2025 |
| LS Filtration Systems Limited | Professional & scientific | 2003 |
| LSJ Holdings Limited | Education | 2006 |
| LT Nova Ltd | Real estate | 2026 |
| Lucian RE Ltd | Real estate | 2020 |
| LUCIFER13 Ltd | Transport & logistics | 2023 |
| Lucusta Travel Services Ltd | Administrative & support | 2023 |
| Lucy Anne Morris Ltd | Extraterritorial | 2022 |
| Lucy Anne Richards Ltd | Extraterritorial | 2022 |
| Lucy B Beauty Ltd | Other services | 2026 |
| Lucy-Paranormal-Journey Ltd | Administrative & support | 2023 |
| Lukas Kinga Trans Ltd | Transport & logistics | 2019 |
| Luke's Landscapes Ltd | Administrative & support | 2026 |
| Lumineux Aesthetics Limited | Other services | 2021 |
| Lunar Moon Music Limited | Arts & recreation | 2017 |
| Lunaria Holdings Limited | Extraterritorial | 2017 |
| Lupine Cyber Ltd | Information & communication | 2026 |
| Lusco Fusco Ltd | Hospitality | 2015 |
| Luthmore Ltd | Manufacturing | 2022 |
| Lutyens & Fitzgerald LLP | | 2022 |
| LUX Nails Bar Chippenham Ltd | Other services | 2025 |
| Luxewood Estates Ltd | Real estate | 2020 |
| Luxury Train Consultancy Ltd | Professional & scientific | 2024 |
| LVD Limited | Administrative & support | 2012 |
| LWR Properties Limited | Real estate | 2022 |
| Lydiard Developments Limited | Construction | 2015 |
| Lydiard Driveways Ltd | Construction | 2024 |
| Lyneham Accident Repair Centre Ltd | Wholesale & retail | 2025 |
| Lyneham Autotech&Tyres Ltd | Wholesale & retail | 2026 |
| Lyneham Pizza&Kebabs Ltd | Hospitality | 2023 |
| M & M Muck Services Ltd | Transport & logistics | 2020 |
| M & O Meat Co Limited | Agriculture & fishing | 2022 |