| Lovit Nail Art Ltd | Other services | 2024 |
| LOW Energy Consultancy Ltd | Professional & scientific | 2011 |
| Lower Wood Farm Management Company Limited | Households | 2023 |
| Lowford Services Ltd | Professional & scientific | 2023 |
| Lowick Developments Limited | Construction | 2020 |
| Lowkey Investors Ltd | Transport & logistics | 2019 |
| Lowther Loudspeaker Systems Limited | Manufacturing | 1995 |
| Lowther-Rolton International Limited | Construction | 1987 |
| Lowther-Rolton Limited | Construction | 2021 |
| Lowtoxbox Limited | Wholesale & retail | 2017 |
| Loxbridge High-Tech Forum Limited | Information & communication | 2024 |
| Loxitons Limited | Wholesale & retail | 2013 |
| Lozzah Ltd | Hospitality | 2024 |
| LP ROM Ltd | Transport & logistics | 2025 |
| LP SD Ninety SIX Limited | Wholesale & retail | 2023 |
| LP Structural Engineering Ltd | Professional & scientific | 2024 |
| LP Watson Services Ltd | Construction | 2023 |
| LPC Holdco Limited | Financial services | 2024 |
| LPE Consultancy Services Ltd | Professional & scientific | 2025 |
| Lpph Holdings Ltd | Construction | 2011 |
| LPT Estates Limited | Real estate | 2026 |
| Lqis Limited | Professional & scientific | 2025 |
| Lrde Group Limited | Wholesale & retail | 2024 |
| Lrsm Properties Ltd | Real estate | 2026 |
| LRV Logistics Ltd | Transport & logistics | 2026 |
| LRY Transport Ltd | Transport & logistics | 2018 |
| LS Construct Ltd | Construction | 2021 |
| LS Financial Consultants Ltd | Professional & scientific | 2026 |
| LS Innovation Ltd | Wholesale & retail | 2020 |
| LS Projects & Services Ltd | Construction | 2025 |
| LS Projects Limited | Real estate | 2008 |
| LS Sports & Performance Limited | Wholesale & retail | 2015 |
| LS Tree and Garden Maintenance Ltd | Administrative & support | 2026 |
| LSI Consultancy Limited | Professional & scientific | 2018 |
| LSL Executive LLP | | 2023 |
| LSN Homes Limited | Real estate | 2023 |
| LSP Productions Limited | Arts & recreation | 2017 |
| LSV Tiling Ltd | Construction | 2026 |
| LT Equine Veterinary Services Ltd | Professional & scientific | 2020 |
| LT Prime Ltd | Construction | 2026 |
| LT Property Group Ltd | Real estate | 2026 |
| LT Taxis Ltd | Transport & logistics | 2026 |
| Lt-Residences Ltd | Real estate | 2023 |
| LTA Food Services Limited | Wholesale & retail | 2010 |
| LTA Wholesale Limited | Financial services | 2024 |
| Ltav Services Limited | Wholesale & retail | 2026 |
| Ltd Removing Ltd | Construction | 2025 |
| LTG Management Ltd | Real estate | 2022 |
| LTK Properties Ltd | Real estate | 2019 |
| Ltrm Ltd | Information & communication | 2016 |
| LTS Boxing Ltd | Arts & recreation | 2025 |
| LTS Rentalz Ltd | Administrative & support | 2025 |
| Lubech Ltd | Information & communication | 2026 |
| Lubriage Ltd | Wholesale & retail | 2015 |
| Lubricant Technology Limited | Wholesale & retail | 2025 |
| LUC Design Limited | Construction | 2022 |
| Luca&Martha Holdings Ltd | Real estate | 2026 |
| Luca-Logi Trans Ltd | Transport & logistics | 2019 |
| Lucaby Ltd | Transport & logistics | 2024 |
| Lucalex Limited | Transport & logistics | 2016 |
| Lucarna Design Limited | Other services | 2016 |
| Lucas BJJ Ltd | Transport & logistics | 2020 |
| Lucas Colvin Properties Limited | Real estate | 2024 |
| Lucas Girmaci Ltd | Transport & logistics | 2020 |
| Lucas Northampton Ltd | Transport & logistics | 2020 |
| Lucasia Ltd | Information & communication | 2022 |
| Lucentis Electrical Ltd | Construction | 2026 |
| Lucian Badea Limited | Construction | 2024 |
| Lucian Consulting Limited | Information & communication | 2010 |
| Lucida Luxury Maritime Holdings (UK) Ltd | Financial services | 2025 |
| Lucidian Limited | Administrative & support | 2010 |
| Luckey Home Improvements Limited | Construction | 2023 |
| Lucky Charm Media Distribution Limited | Administrative & support | 2025 |
| Lucky House 36 Limited | Hospitality | 2023 |
| Lucy Alan Estate Agents Ltd | Real estate | 2021 |
| Lucy Clifton Associates Limited | Financial services | 2023 |
| Ludacris Group Ltd | Construction | 2026 |
| Ludlow BB (Holdings) Limited | Transport & logistics | 2020 |
| Ludwig Willis Architects Limited | Professional & scientific | 2016 |
| Lugas Heating Limited | Construction | 2024 |
| LUI Property Ltd | Construction | 2025 |
| Luka Repairs Ltd | Wholesale & retail | 2017 |
| Lukasz Maciejowski Limited | Wholesale & retail | 2026 |
| Lukasz UBA Ltd | Transport & logistics | 2014 |
| Luke Rehle Cars Ltd | Professional & scientific | 2026 |
| Luke Rehle Ents Ltd | Arts & recreation | 2026 |
| Lukeman Capital Ltd | Real estate | 2019 |
| Lukrs Ltd | Transport & logistics | 2020 |
| Luksal Ltd | Professional & scientific | 2014 |
| Lulu Alexander Property Limited | Real estate | 2023 |
| Lulu's Talent Management Ltd | Arts & recreation | 2025 |
| Lulworth Property Ltd | Real estate | 2025 |
| Lulworth Road Management Limited | Administrative & support | 2008 |
| Luma LEX Ltd | Wholesale & retail | 2025 |
| Lume Investments Ltd | Wholesale & retail | 2015 |
| Lumetic PVT Limited | Information & communication | 2019 |
| Lumiere Tax LLP | | 2024 |
| Lumina Arts Alliance C.I.C. | Administrative & support | 2024 |
| Lumina Theatre Company Ltd | Arts & recreation | 2025 |
| Lumina Vision Ltd | Professional & scientific | 2024 |