| LEO Luxe Cosmetics Limited | Other services | 2025 |
| Leon Lloyd London Ltd | Other services | 2016 |
| Leonard Plus Limited | Real estate | 2020 |
| Lesley Baliga Limited | Professional & scientific | 2025 |
| Leslie Road Management Company Limited | Households | 2020 |
| Lesnik Solutions Ltd | Manufacturing | 2023 |
| Lesson LAB AI Limited | Information & communication | 2023 |
| LET Education Ltd | Administrative & support | 2026 |
| LET Electrical Limited | Construction | 2022 |
| LET Healthcare Ltd | Administrative & support | 2026 |
| LET IT BEE Properties Ltd | Real estate | 2025 |
| LET Them Create Ltd | Information & communication | 2024 |
| Lets BEE Ltd | Information & communication | 2013 |
| Lets GET Lucky Limited | Professional & scientific | 2025 |
| Lets.Chk Ltd | Real estate | 2025 |
| Letshophardrives Ltd | Wholesale & retail | 2023 |
| Levefit Global Limited | Wholesale & retail | 2025 |
| Level Carpentry and Building Ltd | Other services | 2015 |
| Level-Uponlinetutoring Limited | Education | 2024 |
| Leverett Gardens Management Company Ltd | Households | 2015 |
| Leviathan Publishing Ltd | Information & communication | 2024 |
| Levison Projects Ltd | Professional & scientific | 2025 |
| Levza Ltd | Wholesale & retail | 2026 |
| Lewis Building Services Ltd | Construction | 2024 |
| Lewis Capital Management Limited | Financial services | 2012 |
| Lewis Investment Group Limited | Financial services | 2021 |
| Lewis Portfolio Management Limited | Financial services | 2016 |
| Lewis Property Services (UK) Limited | Administrative & support | 2013 |
| Lewis the Barbers Ltd | Other services | 2024 |
| Lewis White Engineering Ltd | Manufacturing | 2016 |
| Lewis-Manning Hospice Care | Health & social care | 2007 |
| Lewis-Manning Hospice Care (Furniture Warehouse) Limited | Extraterritorial | 2004 |
| Lewis-Manning Hospice Care (Lottery) Limited | Administrative & support | 2002 |
| Lewis-Manning Hospice Care (Retail) Limited | Wholesale & retail | 1992 |
| Lewmott-Ics Limited | Construction | 2017 |
| LEX Brickwork Ltd | Construction | 2022 |
| Lex.E Limited | Manufacturing | 2023 |
| Lexington Technologies Ltd | Administrative & support | 2016 |
| Lexloom Advisory LLP | | 2026 |
| Lexway Estates Limited | Real estate | 2016 |
| Leyland Management Solutions Limited | Professional & scientific | 2023 |
| LG Build Limited | Construction | 2009 |
| LG Building Poole Limited | Construction | 2015 |
| LG Taxis Limited | Professional & scientific | 2003 |
| Lg-Tmc Limited | Construction | 2026 |
| Lgftechnical Ltd | Professional & scientific | 2025 |
| LGZ Quality Services Ltd | Health & social care | 2022 |
| LH Aesthetics Ltd | Health & social care | 2026 |
| LHS Homes Ltd | Real estate | 2026 |
| LIA Tania Tigarean Architecture Ltd | Professional & scientific | 2022 |
| Liahore Limited | Wholesale & retail | 2023 |
| Liam Cooper Ltd | Wholesale & retail | 2025 |
| Lianne Chorley Consultancy Limited | Professional & scientific | 2023 |
| Liben Investment Ltd | Real estate | 2024 |
| Liberty Games Interactive Ltd. | Information & communication | 2011 |
| Liberty Initiatives CIC | Agriculture & fishing | 2026 |
| Liberty Rock Capital Limited | Real estate | 2020 |
| Liberty Rock Concierge Ltd | Professional & scientific | 2025 |
| Liberty Rock Energy Limited | Administrative & support | 2024 |
| Liberty Rock Law Limited | Other services | 2026 |
| Liberty Rock Limited | Professional & scientific | 2020 |
| Liberty Rock Property Ltd | Real estate | 2025 |
| Liberty Rock Sport Ltd | Arts & recreation | 2021 |
| Liberty Rock Venture Capital Ltd | Financial services | 2025 |
| Libra Dynamics International Limited | Administrative & support | 2013 |
| Library Estates Limited | Real estate | 2021 |
| Library Road Garage Ltd | Wholesale & retail | 2017 |
| Lichfield Land Company Limited | Real estate | 1990 |
| Liegent Ltd | Information & communication | 2026 |
| Life Insured Ltd | Financial services | 2020 |
| Life Matters Financial Planning Ltd | Financial services | 2017 |
| Life NET Services Limited | Financial services | 2003 |
| Lifelong Medi-Stats Ltd | Health & social care | 2019 |
| LIFESTYLE4U Ltd | Wholesale & retail | 2018 |
| Lifestylelabs HQ Ltd | Wholesale & retail | 2023 |
| Lifetime Connections Ltd | Financial services | 2000 |
| Lifetimegifts Ltd | Wholesale & retail | 2025 |
| Lift UP Limited | Transport & logistics | 2025 |
| Lifted Therapy Limited | Health & social care | 2023 |
| Light Art Creatives Ltd | Arts & recreation | 2021 |
| Light Bytes Technology Ltd. | Information & communication | 2017 |
| Light House Loft Limited | Hospitality | 2025 |
| Lightbulb UX Ltd | Professional & scientific | 2022 |
| Lighthouse Consultants and Trainers Limited | Other services | 2016 |
| Lighthouse Properties Limited | Real estate | 2021 |
| Lightning Construction and Maintenance Services Limited | Construction | 1994 |
| Lightning Electrics Limited | Construction | 2007 |
| Lightrise Technology Ltd | Information & communication | 2025 |
| Lightworks Direct Limited | Extraterritorial | 2004 |
| Liitehaus Ltd | Real estate | 2020 |
| Liitehaus Montpelier Ltd | Real estate | 2021 |
| Liliosa Lingerie Limited | Wholesale & retail | 2024 |
| Lilizi Ltd | Information & communication | 2026 |
| Liljesand & Wiberg Ltd | Professional & scientific | 2019 |
| Liljesand Ltd | Administrative & support | 2017 |
| Lilliput Advisory Ltd | Professional & scientific | 2022 |
| Lilliput Anaesthetics Limited | Health & social care | 2025 |
| Lilliput Consulting Ltd | Information & communication | 2023 |
| Lilliput Developments Limited | Construction | 2020 |
| Lilliput Electrical Limited | Construction | 2013 |