| Linear Fit OUT Ltd | Construction | 2023 |
| Lingam Limited | Wholesale & retail | 2018 |
| Link 13 Ltd | Arts & recreation | 2025 |
| Link Joinery Ltd | Manufacturing | 2020 |
| Link Osteo Health and Wellness Ltd | Health & social care | 2025 |
| Link Pharmacy Limited | Wholesale & retail | 2010 |
| Linked Plumbing and Heating Ltd | Construction | 2018 |
| Linkedup Leads Ltd | Administrative & support | 2023 |
| Linova Ltd | Professional & scientific | 2025 |
| Linton Ceramics Company Limited | Construction | 1986 |
| Linton Fish Ltd | Hospitality | 2025 |
| Linton Growing Ltd | Agriculture & fishing | 2019 |
| Linton Park Wines Ltd | Administrative & support | 2015 |
| Linton Signs (London) Ltd | Manufacturing | 2003 |
| Lion Fire Protection Ltd | Public administration | 2024 |
| Lionheart Products Limited | Manufacturing | 2009 |
| Lions Transport Group Limited | Transport & logistics | 2023 |
| Lipscomb Cars Limited | Wholesale & retail | 1996 |
| Lipscomb Holdings Limited | Financial services | 2005 |
| Liquid Asset Management Limited | Real estate | 2014 |
| Liquid Flow Solutions Ltd | Professional & scientific | 2025 |
| Lisdoonvarna Limited | Administrative & support | 2013 |
| Listerdale Management Limited | Administrative & support | 2003 |
| Liston B Limited | Wholesale & retail | 2026 |
| LIT Property Holdings Ltd | Households | 2018 |
| Little Abbeygate Management (1995) Limited | Households | 1995 |
| Little BIT of This, Little BIT of That Limited | Transport & logistics | 2022 |
| Little Butterflies Limited | Education | 2016 |
| Little Ducklings Baby Spa Ltd | Health & social care | 2021 |
| Little Explorers Properties Limited | Real estate | 2026 |
| Little FAE Limited | Wholesale & retail | 2021 |
| Little Flower Properties Ltd | Real estate | 2025 |
| Little Groves Leisure Parks Limited | Other services | 1998 |
| Little Hatton LR Ltd | Wholesale & retail | 2022 |
| Little Minds Ltd. | Education | 2016 |
| Little Orchid Hairdressing Limited | Other services | 2018 |
| Little Telpits Farm Limited | Real estate | 2013 |
| Litttlefootprints ALL Things Sprayed Limited | Other services | 2023 |
| Live Better and Longer Ltd | Wholesale & retail | 2020 |
| Live Your Best Happy Limited | Administrative & support | 2023 |
| Livemathsuk Ltd | Education | 2022 |
| Livermore HCM Ltd | Information & communication | 2020 |
| Living Beautifully Limited | Wholesale & retail | 2003 |
| Livingxdesign Ltd | Professional & scientific | 2019 |
| Livrite Limited | Health & social care | 2020 |
| Liza Rowland Funeral Directors Limited | Financial services | 2021 |
| Lizahealthcare Limited | Public administration | 2023 |
| Lizzie Wells Limited | Wholesale & retail | 2005 |
| Lizzyconsult Limited | Administrative & support | 2016 |
| LJ Building Ltd | Construction | 2017 |
| LJB Holdco Limited | Financial services | 2023 |
| LJG Auto Electrical Solutions Limited | Manufacturing | 2025 |
| LJN Building Ltd | Construction | 2022 |
| LKB Brickwork & Groundwork's Ltd | Construction | 2026 |
| LKZ Group of Companies Limited | Manufacturing | 2021 |
| Llewellyn Design Limited | Professional & scientific | 2008 |
| Llouis Ltd | Transport & logistics | 2024 |
| LLS Express Ltd | Wholesale & retail | 2024 |
| LLW Services Ltd | Professional & scientific | 2021 |
| LM PM Ltd | Information & communication | 2020 |
| LMC Homes Limited | Construction | 2016 |
| LMC Saddles Ltd | Other services | 2023 |
| LMG Cleaning Ltd | Transport & logistics | 2015 |
| LMS Installations Limited | Construction | 1990 |
| LN Beauty Ltd | Other services | 2022 |
| LND Contracts Ltd | Construction | 2025 |
| Loaded Production Music Limited | Information & communication | 2018 |
| Lock and Key Dating Limited | Arts & recreation | 2025 |
| Lockham 1966 Limited | Extraterritorial | 2014 |
| Lockland Care Ltd | Public administration | 2025 |
| Lockley Bower Engineering Services Limited | Manufacturing | 1984 |
| Lockwise Solutions Ltd | Information & communication | 2026 |
| Lockwood Wealth Limited | Professional & scientific | 2018 |
| Loco Services Limited | Construction | 2021 |
| Locum Supply Limited | Administrative & support | 2009 |
| Loddington Farm Limited | Agriculture & fishing | 1939 |
| Lodido Inc Ltd | Professional & scientific | 2013 |
| Lofoton Consulting Limited | Professional & scientific | 2012 |
| Logic AD Limited | Extraterritorial | 2013 |
| Logic PM Limited | Construction | 2012 |
| Logical Choices Limited | Information & communication | 2007 |
| Logicbridge Solutions Limited | Information & communication | 2026 |
| Logikal Group Limited | Financial services | 2005 |
| Logikal Outsourcing Limited | Professional & scientific | 2016 |
| Logistics and General Medical Holdings Ltd | Financial services | 2020 |
| Logistics and General Medical Limited | Manufacturing | 2017 |
| Lohv Holdings Ltd | Real estate | 2021 |
| Loire Valley Wine Limited | Wholesale & retail | 2007 |
| Loliani Ltd | Wholesale & retail | 2025 |
| Lollymot Textiles Ltd | Wholesale & retail | 2017 |
| LOM Fire Ltd | Professional & scientific | 2020 |
| Lombard Wealth Associates Limited | Administrative & support | 2015 |
| Lombardy Commercial Limited | Manufacturing | 2025 |
| Lome Ltd | Information & communication | 2013 |
| Loncad Limited | Professional & scientific | 2007 |
| Lonczy Limited | Information & communication | 2023 |
| Londeliver Limited | Transport & logistics | 2024 |
| London Acting School Ltd | Arts & recreation | 2021 |
| London Baby, Capital Ltd | Professional & scientific | 2024 |
| London Balustrades and Glazing Systems Ltd | Construction | 2017 |