| Lounge and Leash Limited | Other services | 2025 |
| Love Bangladesh Limited | Health & social care | 2021 |
| Love CLEANING4U Limited | Other services | 2016 |
| Love Education C.I.C. | Education | 2020 |
| Love Glamour Aesthetics Limited | Health & social care | 2015 |
| Love Glamour UK Ltd | Other services | 2026 |
| Love Living Hackney Limited | Extraterritorial | 2025 |
| Love Living Ltd | Real estate | 2022 |
| Love Print (Essex) Ltd | Manufacturing | 2015 |
| Love ROW Limited | Arts & recreation | 2015 |
| LOVE2CARE Medical Ltd | Health & social care | 2020 |
| Loveld U.K. Limited | Other services | 1989 |
| Lovell Ventures Limited | Real estate | 2018 |
| Lovellkd Ltd | Wholesale & retail | 2024 |
| Lovely Shopfront Ltd | Construction | 2020 |
| Loveridge Mews Developments Ltd | Real estate | 2017 |
| LOW Cost Tax Return Ltd | Professional & scientific | 2022 |
| Loxford (Ilford) Limited | Real estate | 2024 |
| Loyal Specs Ltd | Wholesale & retail | 2019 |
| Loystar Ltd | Information & communication | 2021 |
| LPD Solutions Limited | Manufacturing | 2026 |
| LPH Developments Ltd | Construction | 2023 |
| LPH GAS Limited | Construction | 2014 |
| LPH Properties Limited | Real estate | 2023 |
| Lpoc Ltd | Construction | 2019 |
| LPS Mechanical Ltd | Construction | 2022 |
| Lqhconstruction Ltd | Construction | 2022 |
| LR Food Supply Co Ltd | Wholesale & retail | 2022 |
| LR Roofing Services Limited | Construction | 2016 |
| LR Thermal Ltd | Construction | 2026 |
| LRK Blackmans Shoes Ltd | Wholesale & retail | 2017 |
| LRM Property Ltd | Real estate | 2021 |
| LRV Services Ltd | Administrative & support | 2015 |
| Lsdc Holdings Limited | Financial services | 2024 |
| Lsig Homes Ltd | Real estate | 2023 |
| Lsimpson Contractors Ltd | Construction | 2023 |
| Lsisters Ltd | Wholesale & retail | 2024 |
| LSP Consulting Ltd | Professional & scientific | 2017 |
| LSR Lightworks Ltd | Professional & scientific | 2023 |
| LT Aesthetics Ltd | Health & social care | 2026 |
| LT Mapfumo Limited | Professional & scientific | 2024 |
| LT Motors Enterprise Ltd | Wholesale & retail | 2025 |
| LTI LDN Limited | Wholesale & retail | 2018 |
| Ltkm Ltd | Information & communication | 2024 |
| LTS Group Services Ltd | Administrative & support | 2025 |
| LTS Traffic Management Limited | Administrative & support | 2000 |
| Luad UK Limited | Construction | 2018 |
| Lubana Construction Limited | Construction | 2026 |
| LUC Vlad Security Ltd | Construction | 2019 |
| Lucas Team Ltd | Construction | 2018 |
| Lucaslucian Ltd | Wholesale & retail | 2020 |
| Lucca Construction Ltd | Construction | 2023 |
| Lucida Broking Holdings Limited | Financial services | 2018 |
| Luck Construction Limited | Construction | 2013 |
| Luck Homes Ltd | Construction | 2005 |
| Lucky 789 Limited | Hospitality | 2022 |
| Lucky Four International Limited | Wholesale & retail | 2022 |
| Lucky Prestige Ltd | Wholesale & retail | 2025 |
| Lucky Roofing Ltd | Construction | 2021 |
| Lucky Skip Hire Ltd | Water & waste | 2014 |
| Lucky Star Amusements Limited | Arts & recreation | 2012 |
| Lucky Star Construction Limited | Construction | 2020 |
| Lucky Thai Kitchen Limited | Hospitality | 2024 |
| Lucky Wholesale Limited | Wholesale & retail | 2015 |
| Luda Trading Ltd | Administrative & support | 2017 |
| Ludhi Dynasty Ltd | Real estate | 2023 |
| Ludo World Championship Ltd | Information & communication | 2023 |
| Luen Transport Limited | Transport & logistics | 2016 |
| Luggage Basket Ltd | Wholesale & retail | 2023 |
| Luggar Construction Limited | Construction | 2022 |
| Luggar Electrical & Mechanical Ltd | Construction | 2009 |
| Luggar Group Ltd | Financial services | 2021 |
| Luggar MEP Limited | Construction | 2025 |
| Luggar Property Ltd | Real estate | 2021 |
| Lujaro Ltd | Real estate | 2021 |
| Lujolly Estates Ltd | Real estate | 2026 |
| Luke Cutz Collier ROW Ltd | Other services | 2022 |
| Luke November Limited | Information & communication | 2021 |
| Lukemma Design Ltd | Financial services | 2019 |
| Luli Clothing and Fashion Accesories Ltd | Wholesale & retail | 2026 |
| Lullypops Ltd | Real estate | 2019 |
| Luma Design Ltd | Professional & scientific | 2025 |
| Lumetric Energy Technologies Ltd | Energy | 2025 |
| Lumina Staffing Limited | Administrative & support | 2024 |
| Lumine Ultrasound Limited | Health & social care | 2022 |
| Lumineux Skin & Laser Ltd | Wholesale & retail | 2025 |
| Luminous D’Luxe Ltd | Wholesale & retail | 2024 |
| Luminus London Minibuses Ltd | Transport & logistics | 2019 |
| Lumiod Technologies Ltd | Information & communication | 2026 |
| Luna Apartments Ltd | Real estate | 2021 |
| Luna Apparel Ltd | Wholesale & retail | 2024 |
| Luna Homes SA Ltd | Real estate | 2024 |
| Luna Lash London Ltd | Other services | 2019 |
| Luna Resources Ltd | Professional & scientific | 2022 |
| Lunaria Home Limited | Wholesale & retail | 2026 |
| Lunden Property Rental Ltd | Real estate | 2025 |
| Lungu Utility. Ltd | Construction | 2019 |
| Lunna Youth Residential Care Ltd | Health & social care | 2026 |
| Lunor PAY Ltd | Information & communication | 2026 |
| LUO Yuzhouom Ltd | Wholesale & retail | 2025 |