| Lowton Riding Centre Limited | Arts & recreation | 2009 |
| LPG Consult Ltd | Professional & scientific | 2024 |
| LPH Maintenance Ltd | Construction | 2025 |
| LPH NW Ltd | Construction | 2026 |
| LPH Plastering Ltd | Construction | 2018 |
| LPL Building Services Limited | Construction | 2001 |
| Lrail Ltd | Construction | 2019 |
| LRC Consulting Ltd | Professional & scientific | 2023 |
| LRH Breast Surgery Limited | Health & social care | 2018 |
| Lrose Law Limited | Professional & scientific | 2021 |
| LS Interiors Limited | Construction | 2018 |
| LSE PT Limited | Other services | 2024 |
| LSI DRY Lining Limited | Construction | 2024 |
| LSJ Motors Ltd | Wholesale & retail | 2024 |
| LSL Group Limited | Financial services | 2017 |
| LSS Legal Support Ltd | Administrative & support | 2026 |
| Lsuk Developments HLP Limited | Construction | 2018 |
| Lsuk Developments Limited | Financial services | 2016 |
| Lswa Ltd | Transport & logistics | 2023 |
| LTC Hire & Commercial Ltd | Agriculture & fishing | 2019 |
| LTC Tree Surgery Ltd | Agriculture & fishing | 2014 |
| LTC360 Ltd | Professional & scientific | 2025 |
| LTM Waste Management Ltd | Water & waste | 2015 |
| LTP Land and Development Limited | Construction | 2025 |
| LU Events Ltd | Professional & scientific | 2026 |
| Lubeckum | Professional & scientific | 2024 |
| Lucacomm Ltd | Information & communication | 2023 |
| Lucas Investments (U.K.) Limited | Real estate | 2003 |
| Lucenta Limited | Information & communication | 2012 |
| Lucentminea Ltd | Professional & scientific | 2023 |
| Lucidity Holdco Limited | Financial services | 2026 |
| Lucifers Leisure Ltd | Hospitality | 2021 |
| Lucky Hens CIC | Other services | 2011 |
| Lucky Penny Properties Ltd | Real estate | 2018 |
| Lucy Bell Advanced Skincare & Aesthetics Limited | Other services | 2024 |
| Lucys Inc. Limited | Other services | 2023 |
| Lugesano | Professional & scientific | 2025 |
| Lugisaro | Professional & scientific | 2026 |
| LUK Consultancy Ltd | Professional & scientific | 2024 |
| LUK Speed Limited | Transport & logistics | 2021 |
| Luka Designs Ltd | Manufacturing | 2025 |
| Lukchang Ltd | Professional & scientific | 2022 |
| Luke Hambilton Design Ltd | Professional & scientific | 2018 |
| Lullaby Lettings Ltd | Real estate | 2019 |
| Luma Construction Services Ltd | Construction | 2020 |
| Luma Interiors Ltd | Construction | 2010 |
| Luma Properties and Developments Ltd | Financial services | 2024 |
| Luma Workplace Ltd | Construction | 2024 |
| Lumaverse AI Group Ltd | Information & communication | 2025 |
| Lumimagicsky Ltd | Professional & scientific | 2026 |
| Lumina Crest Ltd | Real estate | 2025 |
| Luminosa Aesthetics Limited | Health & social care | 2025 |
| Luminous PAY Limited | Administrative & support | 2026 |
| Luminous VIA Ltd | Professional & scientific | 2025 |
| Luna Collects Limited | Wholesale & retail | 2026 |
| Luna Professional Consultants Limited | Health & social care | 2025 |
| Lunadensa Ltd | Professional & scientific | 2023 |
| Lunch Meal Limited | Hospitality | 2022 |
| Lund and Mahmood Ltd | Health & social care | 2025 |
| Lupine Group Ltd | Administrative & support | 2010 |
| Luscious Homes Ltd | Real estate | 2026 |
| Lusso Dining Ltd | Hospitality | 2026 |
| Lutyline Green Energy Ltd | Professional & scientific | 2019 |
| LUV Nurseries (Preston) Limited | Health & social care | 2022 |
| LUV Nurseries Limited | Health & social care | 2022 |
| Luvaris Ltd | Professional & scientific | 2026 |
| LUX Linens Ltd | Other services | 2024 |
| LUX Wetrooms & Bathrooms Ltd | Construction | 2017 |
| Luxautobodymasters Ltd | Wholesale & retail | 2026 |
| Luxe MCR Limited | Construction | 2025 |
| Luxe Studio Standish Ltd | Other services | 2021 |
| Luxe the School Aesthetics and Beauty Ltd | Other services | 2026 |
| Luxecart Ltd | Wholesale & retail | 2025 |
| Luxelife Solutions Ltd | Professional & scientific | 2023 |
| Luxurious Bathrooms Limited | Construction | 2025 |
| Luxury Couture Limited | Wholesale & retail | 2016 |
| Luxury Leather Werks Ltd | Wholesale & retail | 2023 |
| LV Electrical & Solar Ltd | Construction | 2011 |
| LV Property Group Ltd | Extraterritorial | 2017 |
| LWC Medical Writing Limited | Professional & scientific | 2026 |
| LWD Aesthetics Limited | Health & social care | 2025 |
| LWT Transport Ltd | Transport & logistics | 2019 |
| Lydia Grace Wealth Management Limited | Financial services | 2023 |
| Lyfline Integrated Services Limited | Administrative & support | 2023 |
| Lyian Holdings Limited | Financial services | 2024 |
| Lykka | Professional & scientific | 2023 |
| Lynch Furnishings Limited | Manufacturing | 2008 |
| Lynnc Limited | Wholesale & retail | 2025 |
| Lynx Consultancy Ltd | Information & communication | 2021 |
| Lyon Medical Ltd | Professional & scientific | 2020 |
| Lyon Property Group Limited | Real estate | 2007 |
| Lyon's Properties (NW) Ltd | Real estate | 2020 |
| Lyzal Multi Clean Limited | Administrative & support | 2023 |
| LZH Ltd | Hospitality | 2025 |
| M & a Businesses Limited | Wholesale & retail | 2020 |
| M & a Catering NW Ltd | Hospitality | 2024 |
| M & a PUB Solutions Limited | Hospitality | 2019 |
| M & D Joinery (Wigan) Limited | Construction | 2002 |
| M & I Vehicles Ltd | Extraterritorial | 1998 |
| M & K Consult Ltd | Professional & scientific | 2024 |