| Lovell Lettings Ltd | Real estate | 2025 |
| Lovell Plumbing Services Limited | Construction | 2008 |
| Lovo Star UK Ltd | Wholesale & retail | 2019 |
| LOW Meadows Building Company Ltd | Construction | 2019 |
| LOW Meadows Consulting Ltd | Construction | 2019 |
| LOW Meadows Property Management Ltd | Real estate | 2013 |
| LOW Wood Properties Limited | Real estate | 2008 |
| Lowe and Garforth Limited | | 1968 |
| Lowe Core Utilities Ltd | Construction | 2025 |
| Lowen Behold Ltd | Professional & scientific | 2014 |
| Lower Doghill Farm Limited | Agriculture & fishing | 2026 |
| Lowndesbritton Investments Limited | Real estate | 2018 |
| Lowside Marketing Ltd | Professional & scientific | 2021 |
| LP Swift Properties Ltd | Real estate | 2025 |
| LP Swift Renewables Ltd | Construction | 2024 |
| LPR Ltd | Professional & scientific | 2007 |
| LPT Click Limited | Wholesale & retail | 2024 |
| LR Auto Repairs Ltd | Wholesale & retail | 2025 |
| LR Aviation Services Limited | Manufacturing | 2019 |
| LRB Electrical Services Ltd | Construction | 2022 |
| LRF Services Export Ltd | Wholesale & retail | 2025 |
| LRG Services (Saddleworth) Ltd | Construction | 2024 |
| LRP Building Services Limited | Construction | 2021 |
| LRT Civil Engineering Limited | Administrative & support | 2014 |
| LRW Air Conditioning Ltd | Construction | 2022 |
| LS Weldfab Ltd | Construction | 2026 |
| Lsjk Trading Ltd | Wholesale & retail | 2025 |
| LSM Legal Limited | Professional & scientific | 2017 |
| LT Plumbing & Heating Ltd | Construction | 2021 |
| LT Ventures NW Ltd | Hospitality | 2026 |
| Ltd Onyx Auto Ltd | Wholesale & retail | 2024 |
| LTJ Fabrications Ltd | Manufacturing | 2018 |
| LTS (Oldham) Ltd | Administrative & support | 2013 |
| LTZ Barbers Ltd. | Other services | 2016 |
| LTZ Group Ltd | Financial services | 2025 |
| LTZ Holdings Ltd | Financial services | 2025 |
| LTZ Training Ltd | Education | 2025 |
| LTZ Youth Ltd | Other services | 2019 |
| Luciano's (Bessacarr) Limited | Hospitality | 2005 |
| Luciano's Properties Limited | Real estate | 2002 |
| Lucidgenic Limited | Wholesale & retail | 2025 |
| Luck Capital Ltd | Financial services | 2026 |
| Lucky Chip Limited | Hospitality | 2023 |
| Lucky Star Oldham Ltd | Hospitality | 2023 |
| Luckynest Ltd | Real estate | 2024 |
| Luckys Franchises Limited | Administrative & support | 2022 |
| Lucy Atherton Permanent Makeup Limited | Other services | 2022 |
| Lucy Cobb Limited | Wholesale & retail | 2006 |
| Ludgman Ltd | Information & communication | 2023 |
| Ludicio Limited | Professional & scientific | 2015 |
| Ludo Laboratories Ltd | Information & communication | 2026 |
| Lukasz Szymczak Ltd | Transport & logistics | 2017 |
| LUL Flexibles Limited | Extraterritorial | 2016 |
| Luma Property LLP | | 2026 |
| Lumen Language Ltd | Professional & scientific | 2026 |
| Lumex Events Ltd | Professional & scientific | 2026 |
| Lumin Care Homes Ltd | Health & social care | 2025 |
| Lumina (NW) Ltd | Wholesale & retail | 2025 |
| Lumina Constructions Ltd | Construction | 2023 |
| Lumina Therapeutic Communities Ltd | Health & social care | 2023 |
| Lumino Kids Ltd | Education | 2025 |
| Lumixx Ltd | Wholesale & retail | 2025 |
| Luna Bleus Kitchen Ltd | Hospitality | 2025 |
| Lunalab Air Limited | Hospitality | 2023 |
| Lunalab Holdings Limited | Financial services | 2021 |
| Lunalab Properties Alpha Limited | Real estate | 2023 |
| Lunalab Properties Bravo Limited | Real estate | 2023 |
| Lunalab Properties Charlie Limited | Real estate | 2023 |
| Lunalab Properties Delta Limited | Real estate | 2023 |
| Lunalab Properties Limited | Real estate | 2022 |
| Lunar Accounting Services Limited | Professional & scientific | 2018 |
| Lunar Skyway Ltd | Real estate | 2024 |
| Lunarnrg Ltd | Professional & scientific | 2025 |
| Lune 1957 Limited | Extraterritorial | 2014 |
| Luotti Limited | Real estate | 2023 |
| Lupo Construction Services Limited | Professional & scientific | 2017 |
| Luqys Properties Ltd | Real estate | 2025 |
| Lush Carpets & Blinds Ltd | Construction | 2025 |
| Lush Nails Ltd | Other services | 2024 |
| Lustro Stone UK Ltd | Construction | 2021 |
| Lutens Fashion Limited | Other services | 2026 |
| Luwa (U.K.) Limited | Manufacturing | 1959 |
| LUX Accounts Limited | Professional & scientific | 2026 |
| LUX Laundry Ltd | Other services | 2026 |
| LUX Nails Lounge Ltd | Other services | 2026 |
| LUX Pro Cleaning Services Ltd | Administrative & support | 2025 |
| Luxar Health Spa Ltd | Other services | 2025 |
| Luxe Beauty Makeups Limited | Other services | 2020 |
| Luxe Builder Oldham Ltd | Construction | 2026 |
| Luxe Home Decor Ltd | Wholesale & retail | 2020 |
| Luxe HQ Ltd | Other services | 2026 |
| Luxe Trading and Manufacturing Ltd | Wholesale & retail | 2024 |
| Luxebay Ltd | Other services | 2018 |
| Luxede Comfort Ltd | Wholesale & retail | 2026 |
| Luxeline Multi Trade Building Contractors Ltd | Construction | 2025 |
| Luxell Homes Limited | Real estate | 2020 |
| Luxepetal Styling Limited | Manufacturing | 2025 |
| Luxestay Rooms Ltd | Real estate | 2025 |
| Luxewumarc Prestige Cleaning Ltd | Administrative & support | 2026 |
| Luxh Properties Ltd | Real estate | 2022 |