| Lu-Tobias Limited | Health & social care | 2018 |
| Luatec Limited | Information & communication | 2024 |
| Lubana Global Limited | Wholesale & retail | 2022 |
| Lubenham 1 Limited | Construction | 2018 |
| Lubenham Retail Limited | Real estate | 2026 |
| Lubenta Ltd | Wholesale & retail | 2026 |
| Lubmart Healthcare Services Limited | Health & social care | 2015 |
| Lubrizol Adibis Holdings (UK) Limited | Professional & scientific | 1954 |
| Lubrizol Limited | Manufacturing | 1963 |
| Lubrizol Management UK Limited | Financial services | 2022 |
| Lucalbtay Ltd | Professional & scientific | 2025 |
| Lucan Developments Limited | Real estate | 1997 |
| Lucas Bass Ltd | Transport & logistics | 2020 |
| Lucas Derby Ltd | Wholesale & retail | 2024 |
| Lucas Digital Limited | Information & communication | 2026 |
| Lucas Licensing Limited | Professional & scientific | 2008 |
| Lucenai Ltd | Information & communication | 2025 |
| Lucid Design Ltd | Construction | 2021 |
| Lucid Outfitters Ltd | Wholesale & retail | 2019 |
| Lucige Limited | Information & communication | 2023 |
| Luciole Psychotherapy Ltd | Health & social care | 2021 |
| Lucky 23 Holdings Ltd | Financial services | 2021 |
| Lucky 885 Limited | Hospitality | 2024 |
| Lucky Johal Cpsychol Ltd | Professional & scientific | 2024 |
| LUCKY7 Sun Ltd | Hospitality | 2018 |
| Lucmor Limited | Information & communication | 2010 |
| Luco Property Investment Limited | Real estate | 2022 |
| Lucocq Holdings Limited | Financial services | 2022 |
| Lucstrans Ltd | Transport & logistics | 2017 |
| Lucy Nail Bar Ltd | Other services | 2023 |
| Luddington Learning Limited | Education | 2022 |
| Ludlow Electrical Ltd | Construction | 2018 |
| Lugia Property Investments Limited | Real estate | 2021 |
| Luis Chomiak Limited | Administrative & support | 2006 |
| LUK Pro Limited | Transport & logistics | 2022 |
| Lukasz Grzesiak Ltd | Transport & logistics | 2016 |
| Luke Butler Properties Ltd | Real estate | 2021 |
| Luke Evans Bakery Ltd | Manufacturing | 2011 |
| Luke Logan Consulting Ltd | Real estate | 2022 |
| Luke Northridge Ltd | Information & communication | 2024 |
| Lukes Barber Shop & Salon Ltd | Other services | 2020 |
| LUL Property Limited | Real estate | 2023 |
| Lulamae Ltd | Information & communication | 2011 |
| Lullune Ltd | Wholesale & retail | 2025 |
| Lulu Mechanical Limited | Construction | 2018 |
| Lulua Travel Ltd | Administrative & support | 2025 |
| Luluhstar Health Care Limited | Health & social care | 2023 |
| Luma Real Estate Ltd | Real estate | 2026 |
| Lumenyu Ltd | Health & social care | 2018 |
| Lumi Homes Ltd | Real estate | 2023 |
| Lumia Dynamics Ltd | Professional & scientific | 2025 |
| Lumiance Ltd | Wholesale & retail | 2012 |
| Lumiere PR Limited | Professional & scientific | 2014 |
| Luminary Innovations Ltd | Wholesale & retail | 2020 |
| Luminosity BI Limited | Professional & scientific | 2018 |
| Lumique Ltd | Real estate | 2026 |
| Lunar Mind C.I.C. | Health & social care | 2022 |
| Lunar Mind Therapeutic Services Ltd | Health & social care | 2026 |
| Lunts Heath Rise Management Company Limited | Households | 2024 |
| Luong Holdings Ltd | Financial services | 2023 |
| Lupax Ltd | Wholesale & retail | 2024 |
| Lupus Liaisons Limited | Other services | 2012 |
| Luscombe Consulting Limited | Professional & scientific | 2010 |
| Lust Living Limited | Professional & scientific | 2019 |
| Luther & Spinx Limited | Real estate | 2017 |
| LUX & Fortis Holdings Ltd | Real estate | 2022 |
| LUX Nails Derby Limited | Other services | 2022 |
| LUX Wood Wonders Ltd | Construction | 2025 |
| Luxa Holdings Limited | Real estate | 2022 |
| Luxe Apartments Limited | Real estate | 2012 |
| Luxe Bargain Deals Ltd | Wholesale & retail | 2025 |
| Luxe Lounge Tanning Ltd | Health & social care | 2024 |
| Luxebuild Enterprises Ltd | Construction | 2026 |
| Luxebury Homes Limited | Real estate | 2020 |
| Luxedrift Ltd | Wholesale & retail | 2025 |
| Luxelink Logistics Limited | Transport & logistics | 2025 |
| Luxes Hairs UK Ltd | Other services | 2023 |
| Luxo Fashion Limited | Wholesale & retail | 2018 |
| Luxor Automotive Limited | Wholesale & retail | 2025 |
| Luxumars Ltd | Wholesale & retail | 2025 |
| Luxury Candles Ltd | Wholesale & retail | 2025 |
| Luxury CUT Barber Derby Ltd | Other services | 2024 |
| Luxury Eboutique Ltd | Wholesale & retail | 2024 |
| Luxury Glamping Hire Midlands Ltd | Administrative & support | 2023 |
| Luxury Glamping Hire Midlands North Ltd | Administrative & support | 2023 |
| Luxury Glamping Hire Midlands South Ltd | Administrative & support | 2023 |
| Luxury Glamping Hire North Ltd | Administrative & support | 2023 |
| Luxury Glamping Hire South Ltd | Administrative & support | 2023 |
| Luxury Travel Midlands Ltd | Transport & logistics | 2024 |
| Luxxeproperties Ltd | Administrative & support | 2024 |
| LV Group Holdings Ltd | Financial services | 2023 |
| LVL London Ltd | Administrative & support | 2019 |
| LW Data Cabling Limited | Construction | 2023 |
| LW Property Surveys Limited | Professional & scientific | 2020 |
| LWC Property Group Ltd | Real estate | 2021 |
| LWM Property Investments Limited | Real estate | 2020 |
| Lyah Foods Limited | Hospitality | 2019 |
| LYI Ltd | Administrative & support | 2025 |
| Lyly Nails 851 Ltd | Other services | 2024 |
| LYN Taylor Training and Storage Ltd | Education | 2018 |