| Lrvv Property Developments Limited | Real estate | 2019 |
| LS Essex CO6 Ltd | Hospitality | 2025 |
| LS Landscaping and Build Ltd | Administrative & support | 2026 |
| LS Services Limited | Health & social care | 2017 |
| LSE Management Company Ltd | Real estate | 2019 |
| LSE Planning and Design Limited | Professional & scientific | 2014 |
| Lshr Limited | Administrative & support | 2017 |
| LSI Consulting Limited | Extraterritorial | 2025 |
| LSL Promotions Ltd | Arts & recreation | 2025 |
| LTB Colchester Ltd | Hospitality | 2016 |
| LTB Holdings Ltd | Professional & scientific | 2019 |
| Ltech Group Ltd | Administrative & support | 2020 |
| Ltjb Investments Limited | Wholesale & retail | 2013 |
| LTM Engineering Ltd | Agriculture & fishing | 2015 |
| LTP Property Services Ltd | Real estate | 2024 |
| LTV1973 Limited | Hospitality | 2023 |
| LTW Transport Ltd | Transport & logistics | 2016 |
| Luba'Es Limited | Administrative & support | 2024 |
| Lubron UK Limited | Manufacturing | 1995 |
| Lucemi Consulting Ltd | Professional & scientific | 2016 |
| Lucia Capital Consulting Limited | Professional & scientific | 2020 |
| Lucian Services Ltd | Transport & logistics | 2016 |
| Luciano Driving Limited | Transport & logistics | 2025 |
| Lucid Consultancy Ltd | Professional & scientific | 2025 |
| Lucinda Wildin Hair Limited | Other services | 2013 |
| Luckily 8 Limited | Hospitality | 2025 |
| Lucky ALY Elite Ltd | Transport & logistics | 2023 |
| Lucky Rascal Films Ltd | Other services | 2026 |
| Lucky Star 2024 Ltd | Hospitality | 2024 |
| Lucy Clare Ltd | Other services | 2023 |
| Lucy Graham Property Ltd | Real estate | 2025 |
| Lucy Jane Interpreting Ltd | Professional & scientific | 2015 |
| Ludbrook Investments Ltd | Financial services | 2020 |
| Ludwik Rose Associates Ltd | Administrative & support | 2013 |
| Lujo Investments Limited | Real estate | 2024 |
| Lujo London Ltd | Wholesale & retail | 2020 |
| Lukana Ltd | Manufacturing | 2025 |
| Luke Southwell Limited | Construction | 2012 |
| Luke Wilce Limited | Construction | 2018 |
| Luke’N Good Window Cleaning Services Limited | Administrative & support | 2025 |
| Lukgor Ltd | Real estate | 2019 |
| Luma M Care Services Ltd | Health & social care | 2022 |
| Lumenis Theatre Company LLP | | 2011 |
| Lumilaw Ltd | Professional & scientific | 2015 |
| Lumina Display Systems Limited | Information & communication | 1991 |
| Lumineric Ltd | Information & communication | 2021 |
| Lumisse Consulting Ltd | Hospitality | 2026 |
| Lumpton Associates Ltd | Professional & scientific | 2018 |
| Lumpton Investments Ltd | Financial services | 2021 |
| Luna & Moons Ltd | Manufacturing | 2022 |
| Luna Alpha Ltd | Professional & scientific | 2017 |
| Luna Future Ltd | Wholesale & retail | 2025 |
| Luna Magic Designs Ltd | Manufacturing | 2020 |
| Lunah Magik Ltd | Real estate | 2022 |
| Lunar Grove Estate Limited | Real estate | 2025 |
| Lungley Return Solutions Ltd | Administrative & support | 2026 |
| Lunik Cleaning & Property Services Ltd | Real estate | 2022 |
| Lupol Limited | Wholesale & retail | 2013 |
| Lury Aggregates Limited | Mining & quarrying | 2008 |
| Lury Holding Limited | Financial services | 2002 |
| Lury Homes Limited | Construction | 2008 |
| Luscombe Landscapes & Builds Ltd | Administrative & support | 2023 |
| Lushlaser & Skin Limited | Other services | 2022 |
| Luxe City Escapes Ltd | Real estate | 2024 |
| Luxe Nursery Ltd | Health & social care | 2025 |
| Luxenoa Ltd | Wholesale & retail | 2018 |
| Luxuriously Healthy Ltd | Manufacturing | 2023 |
| Luxury Box Limited | Manufacturing | 2015 |
| Luxury France Tours Limited | Administrative & support | 2022 |
| LV Maintenance Ltd | Professional & scientific | 2010 |
| LW Consultancy Solutions Ltd | Administrative & support | 2011 |
| LWT Welding & Fabrication Limited | Construction | 2014 |
| Lyanka Care Ltd | Health & social care | 2025 |
| LYC Home Improvements Ltd | Construction | 2026 |
| Lydia Enterprise and Innovation Ltd | Health & social care | 2023 |
| Lydia Home & Gardens Limited | Construction | 2026 |
| Lylacom Limited | Information & communication | 2017 |
| LYN JC Properties Ltd | Real estate | 2025 |
| Lynb Consulting Ltd | Health & social care | 2018 |
| Lyndon Dean Limited | Real estate | 2021 |
| Lyness & Co Limited | Other services | 2020 |
| Lynette Flynn Events Ltd | Hospitality | 2012 |
| Lynmore Homes LLP | | 2015 |
| Lynnbrook Management Company Limited | Households | 2003 |
| Lynton Build Limited | Construction | 2018 |
| Lynton Homes (2) Limited | Construction | 2015 |
| Lynvale Limited | Wholesale & retail | 2006 |
| Lyons Power Ltd | Construction | 2019 |
| LYP Ltd | Information & communication | 2023 |
| Lyricoda Ltd | Real estate | 2024 |
| Lysian & Associates Consultants Ltd | Professional & scientific | 2026 |
| Lystra Limited | Real estate | 2018 |
| Lythgo Associates Limited | Professional & scientific | 2023 |
| Lyward Colley Trust CIC | Health & social care | 2023 |
| LZ Trading Ltd | Hospitality | 2016 |
| LZF Global Limited | Health & social care | 2025 |
| M & D Mechanical Services Ltd | Administrative & support | 2010 |
| M & E Management Limited | Professional & scientific | 2003 |
| M & L Security Solutions Ltd | Administrative & support | 2019 |
| M & M Glazing Essex Ltd | Construction | 2022 |