| Lumiere Photographic Limited | Professional & scientific | 2026 |
| Lumikey Ltd | Information & communication | 2025 |
| Lumiligner Leeds Ltd | Health & social care | 2025 |
| Lumiligner Ltd | Health & social care | 2024 |
| Lumina by Pauline Ltd | Arts & recreation | 2024 |
| Lumina Doors and Windows Ltd | Construction | 2025 |
| Lumina Electric Drives Limited | Wholesale & retail | 2022 |
| Lumina IT Ltd | Information & communication | 2022 |
| Lumina Logistics Ltd | Transport & logistics | 2024 |
| Luminar Healthcare Estates Limited | Construction | 2012 |
| Luminar Partnership Limited | Real estate | 2011 |
| Luminary Holidings Ltd | Administrative & support | 2024 |
| Luminate Property Development Company Limited | Construction | 2015 |
| Lumine Associates Ltd | Wholesale & retail | 2025 |
| Lumine Ltd | Administrative & support | 2025 |
| Luminor Professional Services Limited | Professional & scientific | 2025 |
| Luminous Skin Ltd | Other services | 2025 |
| Luminvibe Technologies Ltd | Information & communication | 2024 |
| Lumira Search Limited | Administrative & support | 2025 |
| Lumitru Limited | Manufacturing | 2024 |
| Lumiwhite Academy Ltd | Health & social care | 2024 |
| Lumiwhite Laboratory Ltd | Health & social care | 2025 |
| Lumiwhite Teeth Ltd | Health & social care | 2019 |
| Lumley Castle Hotel Limited | Hospitality | 1971 |
| Lumley Wealth Management Ltd | Financial services | 2021 |
| Lumley's Dynamic Distribution Ltd | Wholesale & retail | 2023 |
| Lumlinks Investment & Co Ltd | Wholesale & retail | 2026 |
| Lummies Limited | Real estate | 2020 |
| Lumos Rentals Limited | Administrative & support | 2025 |
| Lumosmile Ltd | Wholesale & retail | 2026 |
| Lumsar's @ Hyde Park Ltd | Wholesale & retail | 2022 |
| Lumsum Limited | Hospitality | 2026 |
| Luna AI Technologies Ltd | Information & communication | 2025 |
| Luna DE PAK 2017 Ltd | Hospitality | 2022 |
| Luna Foods L Ltd | Manufacturing | 2021 |
| Luna Lifestyle Limited | Real estate | 2017 |
| Luna MJ Properties Ltd | Real estate | 2023 |
| Luna Module Ltd | Information & communication | 2024 |
| Luna Nexus Ltd | Professional & scientific | 2026 |
| Luna ROZ Limited | Professional & scientific | 2022 |
| Luna Tech Ltd | Information & communication | 2025 |
| Luna the Lemon Ltd | Other services | 2022 |
| Lunar Couriers Ltd | Transport & logistics | 2022 |
| Lunar Kitchens Ltd | Construction | 2025 |
| Lunar Media Limited | Information & communication | 2008 |
| Lunar Security Ltd | Administrative & support | 2022 |
| Lunaria Luxe Models Limited | Professional & scientific | 2025 |
| Lunaris Digital Consulting Ltd | Information & communication | 2019 |
| Lunas Street Food & Catering Limited | Hospitality | 2024 |
| Lunirko Ltd | Wholesale & retail | 2026 |
| Lupe's Cantina Mexicana Limited | Hospitality | 2015 |
| Lupes Properties Ltd | Hospitality | 2021 |
| Lupfaw 283 Limited | Professional & scientific | 2009 |
| Lupfaw 471 Limited | Financial services | 2017 |
| Lupfawsma Limited | Manufacturing | 1924 |
| Lupine Adventure Co-Operative Limited | Arts & recreation | 2007 |
| Lupton Motors Ltd | Wholesale & retail | 2025 |
| Lupulucas Ltd | Transport & logistics | 2025 |
| Luqman Properties Ltd | Administrative & support | 2018 |
| Lureglobal Ltd | Information & communication | 2026 |
| Luscious Beauty Bar Limited | Other services | 2017 |
| Luscious Tanning Limited | Other services | 2017 |
| Luscombe Motors Holdings Limited | Financial services | 2017 |
| Luscombe Motors Limited | Wholesale & retail | 2009 |
| Lush Asset Limited | Real estate | 2020 |
| Lush Firm Ltd | Wholesale & retail | 2023 |
| Lush Line Landscaping Ltd | Administrative & support | 2025 |
| Lush Suites Ltd | Households | 2020 |
| Lushi Foods Limited | Hospitality | 2024 |
| Lushscapes Ltd | Administrative & support | 2023 |
| Lusine Property Management Limited | Real estate | 2025 |
| Lusitano Limited | Agriculture & fishing | 2025 |
| Lustrar Ltd | Wholesale & retail | 2021 |
| Lustrebyk Ltd | Wholesale & retail | 2025 |
| Lustrum Holdings Limited | Administrative & support | 2017 |
| Lutek Training Limited | Education | 2018 |
| Luthando Neuro-Connect CIC | Education | 2026 |
| Luthando Neurodiversity Ltd | Education | 2026 |
| Lutra Studio CIC | Manufacturing | 2021 |
| Luty Living Ltd | Real estate | 2026 |
| Luuxx CP Group Ltd | Construction | 2023 |
| LUV Fitness Studios Limited | Arts & recreation | 2017 |
| LUV Jesus Ministries CIC | Health & social care | 2017 |
| Luvenesco Limited | Wholesale & retail | 2015 |
| Luwakharis Limited | Administrative & support | 2025 |
| LUX Aparts Ltd | Other services | 2015 |
| LUX Investments Yorkshire Limited | Administrative & support | 2025 |
| LUX Source UK @ Leeds Ltd | Wholesale & retail | 2026 |
| LUX Vegan Cakes Ltd | Manufacturing | 2020 |
| LUX Wholesaler Ltd | Wholesale & retail | 2025 |
| Lux&Co Ltd | Other services | 2018 |
| Lux-Rooms Ltd | Construction | 2017 |
| Luxandra Limited | Wholesale & retail | 2024 |
| Luxbylala Limited | Other services | 2023 |
| Luxe Autospa Ltd | Administrative & support | 2025 |
| Luxe Bridge Properties Ltd | Real estate | 2026 |
| Luxe Cleaning (NW) Ltd | Administrative & support | 2026 |
| Luxe Glazing Ltd | Construction | 2025 |
| Luxe Grazing Ltd | Hospitality | 2023 |
| Luxe Lenses Limited | Administrative & support | 2025 |