| Long Legs Yachting Limited | Extraterritorial | 2026 |
| Long YUN (UK) PTE Ltd | Wholesale & retail | 2024 |
| Longfield Homes Limited | Real estate | 2003 |
| Longview Boarding Kennels & Cattery Ltd | Other services | 2019 |
| Loot Cache Limited | Wholesale & retail | 2025 |
| Lord Yachting Limited | Extraterritorial | 2023 |
| Lord's Antiques and Salvage Limited | Wholesale & retail | 2018 |
| Lords Plaza Limited | Administrative & support | 2023 |
| Lorin Consulting Limited | Information & communication | 2012 |
| Lotus Food Services Limited | Hospitality | 2024 |
| Lotus International Care Ltd | Hospitality | 2023 |
| Lotus Medical Aesthetics Ltd | Other services | 2025 |
| Lougarths Limited | Hospitality | 2017 |
| Louise Gould Limited | Information & communication | 2019 |
| Loumax Advisory Ltd | Professional & scientific | 2017 |
| Lousand Limited | Hospitality | 2023 |
| Love and Pride Productions North West CIC | Arts & recreation | 2025 |
| Love Faith Hope Ltd | Wholesale & retail | 2019 |
| Love Sport Foundation CIC | Arts & recreation | 2021 |
| LOW Cost Legal Ltd | Professional & scientific | 2017 |
| LOW Cost Legal Services Ltd | Professional & scientific | 2015 |
| LOW Wood Management Company Limited | Households | 2019 |
| Lowe Motor Sales Limited | Wholesale & retail | 2023 |
| Lower Hill (Holdings) Limited | Professional & scientific | 1989 |
| Lower Limb Consultancy Services Ltd | Health & social care | 2019 |
| Lowes Court Limited | Households | 1985 |
| Lowes Court Management Limited | Households | 1989 |
| Lowes Equipment Hire Limited | Professional & scientific | 1974 |
| Lowlands Alpacas and Wellness Community Interest Company | Education | 2026 |
| Lowleaves.R Ltd | Real estate | 2025 |
| Lowmoorhead Developments Ltd | Administrative & support | 2014 |
| Lowood Lodge Limited | Households | 1976 |
| Lowther Construction Limited | Extraterritorial | 2013 |
| LPS & SON Ltd | Real estate | 2024 |
| LPS Brothers Limited | Extraterritorial | 2020 |
| LPS Construction Group Ltd | Construction | 2020 |
| LPS Development Group Ltd | Construction | 2020 |
| LPS Group Limited | Real estate | 2008 |
| LPS Kendal Developments Limited | Construction | 2024 |
| LR Overland Ltd | Wholesale & retail | 2018 |
| LRB Watches Limited | Wholesale & retail | 2019 |
| LRC QS Services L Ltd | Professional & scientific | 2018 |
| Lrkh Consultancy Ltd | Professional & scientific | 2021 |
| LS Flooring NW Ltd | Construction | 2024 |
| LS Plastering Ltd | Construction | 2016 |
| LSG Entertainments and Events Limited | Other services | 2020 |
| LT Coaching Ltd | Professional & scientific | 2023 |
| LT Janitorial Services Ltd | Administrative & support | 2021 |
| LTC Property Management Ltd | Real estate | 2024 |
| Ltdedition Ltd | Professional & scientific | 2015 |
| LTL Construction and Maintenance Ltd | Construction | 2015 |
| Lublub Limited | Real estate | 2021 |
| Lucas Commercial Property Group Limited | Real estate | 2023 |
| Lucas Property Group Limited | Real estate | 2021 |
| Lucas Rubbertech Ltd | Professional & scientific | 2022 |
| Lucas Stanley Limited | Other services | 2017 |
| Lucas' Friends Ltd | Wholesale & retail | 2024 |
| Lucid Engineering Ltd | Professional & scientific | 2021 |
| Lucky Number 3 Limited | Hospitality | 2017 |
| Lucky Small Boat Ltd | Hospitality | 2020 |
| LUCKYDEALS4U Ltd | Wholesale & retail | 2026 |
| Lucrative Studio Ltd | Wholesale & retail | 2024 |
| Lucy Swann Designs Limited | Professional & scientific | 2017 |
| Lucys Consultants UK Limited | Information & communication | 2011 |
| Luge Holdings Limited | Financial services | 2026 |
| Luigi Blackpool Ltd | Hospitality | 2024 |
| Luje Accommodation Limited | Real estate | 2023 |
| Luje Retail Limited | Hospitality | 2023 |
| Lula Ella Brides Limited | Wholesale & retail | 2016 |
| Lulino Blackpool Ltd | Hospitality | 2023 |
| Lulino Investments Ltd | Real estate | 2024 |
| Lumenara AI Limited | Information & communication | 2026 |
| Lumenata Lighting Limited | Construction | 2015 |
| Lumiharicot Ltd | Financial services | 2025 |
| Luminated Lettings Ltd | Real estate | 2022 |
| Lumineye Limited | Information & communication | 2019 |
| Luminous Suites Ltd | Hospitality | 2024 |
| Luminovas Concepts Ltd | Wholesale & retail | 2023 |
| Luna MIA Yachting Ltd | Extraterritorial | 2022 |
| Lunar Safety Services Ltd | Professional & scientific | 2023 |
| Lunarie Jewellery Ltd | Wholesale & retail | 2026 |
| Luneside Traders Limited | Wholesale & retail | 2026 |
| Lunita Home Ltd | Wholesale & retail | 2023 |
| Lupus Solus Studio Limited | Information & communication | 2016 |
| Lustrora Ltd | Wholesale & retail | 2023 |
| Luthol Ltd | Professional & scientific | 2020 |
| LUX Nails & Spa 8 Ltd | Other services | 2025 |
| Lux-Pro Exterior Cleaning Ltd | Administrative & support | 2026 |
| Luxe Global Ltd | Professional & scientific | 2019 |
| Luxe Hair Lounge Ltd | Other services | 2014 |
| Luxe Holiday Accommodation Blackpool Limited | Hospitality | 2024 |
| Luxe Walls Limited | Manufacturing | 2025 |
| Luxe Woodhouse Limited | Hospitality | 2025 |
| Luxeppf Ltd | Wholesale & retail | 2023 |
| Luxetouch Cleaning Services Ltd | Administrative & support | 2025 |
| Luxloo Limited | Wholesale & retail | 2025 |
| Luxury Aura Clothing Ltd | Wholesale & retail | 2025 |
| Luxury Elegant Bridal Ltd | Wholesale & retail | 2024 |
| Luxury Garden Buildings UK Limited | Construction | 2018 |
| Luxury Guide International Limited | Other services | 2018 |