| Lumar Estates Limited | Real estate | 2022 |
| Lumar Trading Limited | Wholesale & retail | 2004 |
| Lumber Jack Services Limited | Agriculture & fishing | 2016 |
| Lumex Group Ltd | Construction | 2024 |
| Luminex Corporation Ltd | Wholesale & retail | 2025 |
| Luminosity Visual Consulting Ltd | Arts & recreation | 2017 |
| Lumo Web Host Ltd | Information & communication | 2026 |
| Lumos Creative Ltd | Wholesale & retail | 2025 |
| Luna Children & Adult Services Ltd | Education | 2023 |
| Luna Supplies Ltd | Wholesale & retail | 2025 |
| Luna Trans Ltd | Transport & logistics | 2019 |
| Lunevaluxe Ltd | Wholesale & retail | 2026 |
| Lunexis Ltd | Wholesale & retail | 2026 |
| Lungu Logistics Ltd | Transport & logistics | 2019 |
| Lunic Nomad Ventures Limited | Real estate | 2024 |
| Lupine IT Consultants Limited | Information & communication | 2012 |
| Lush Lending Limited | Financial services | 2017 |
| Lush Properties (West Midlands) Ltd | Real estate | 2024 |
| Lush Properties UK Limited | Real estate | 2015 |
| Lush Rentals Limited | Real estate | 2024 |
| Luthra Investments Ltd | Real estate | 2025 |
| Lutner Aesthetics Ltd | Other services | 2022 |
| Luton Logistics Limited | Transport & logistics | 1999 |
| Luvleefloors Ltd | Construction | 2018 |
| LUX Complete Finance Ltd | Administrative & support | 2024 |
| LUX Domus Limited | Administrative & support | 2025 |
| LUX Fashion Source Ltd | Wholesale & retail | 2019 |
| LUX Fiat Ltd | Wholesale & retail | 2025 |
| LUX Financial Advice Ltd | Financial services | 2026 |
| LUX Valeting Centre Ltd | Administrative & support | 2019 |
| Luxcommerce Ltd | Wholesale & retail | 2025 |
| Luxe Estate Agents Limited | Real estate | 2025 |
| Luxe Staycation Ltd | Hospitality | 2023 |
| Luxe TAN Studio Ltd | Other services | 2025 |
| Luxemart Ltd Ltd | Wholesale & retail | 2024 |
| Luxembourg Recruitment Partnership Limited | Professional & scientific | 2025 |
| Luxevo Build Ltd | Construction | 2025 |
| Luxhom Invest Limited | Real estate | 2021 |
| Luxors Furnish Ltd | Wholesale & retail | 2025 |
| Luxsurf Cleaning Service Ltd | Administrative & support | 2026 |
| Luxury City Stays Ltd | Hospitality | 2019 |
| Luxury Dukan Ltd | Wholesale & retail | 2026 |
| Luxury Golf Brands Ltd | Wholesale & retail | 2008 |
| LV Motors Wolverhampton Limited | Wholesale & retail | 2018 |
| Lvprt Ltd | Information & communication | 2023 |
| LW Occupational Therapy Ltd | Health & social care | 2024 |
| Lwilson Ltd | Health & social care | 2019 |
| Lyall Homes Ltd | Real estate | 2025 |
| Lykon Business Solutions Ltd | Professional & scientific | 2026 |
| Lykos Multi Academy Trust | Education | 2015 |
| Lymah African Store Ltd | Wholesale & retail | 2024 |
| Lynch Housing Limited | Real estate | 2025 |
| Lyncroft Interior Design Limited | Manufacturing | 2002 |
| Lyndon Kerr Ltd | Construction | 2024 |
| Lynmoor Properties Limited | Real estate | 2025 |
| Lynn Munro Broadcast Limited | Information & communication | 2008 |
| Lynton Engineering Ltd | Wholesale & retail | 2002 |
| Lynton Engineering Supplies Limited | Professional & scientific | 2024 |
| Lyons Real Estate Limited | Real estate | 2022 |
| Lysy Company Ltd | Construction | 2021 |
| Lytchgate Living Limited | Real estate | 2022 |
| LYV Well CBD Limited | Wholesale & retail | 2019 |
| LYV Well Limited | Wholesale & retail | 2019 |
| LZ Retail Group Ltd | Wholesale & retail | 2024 |
| M & a Window Cleaning Limited | Administrative & support | 2006 |
| M & E Aggregates Limited | Professional & scientific | 2021 |
| M & E Group (Leicester) Ltd | Construction | 2021 |
| M & E Group (South) Limited | Construction | 2021 |
| M & G Developments (Holdings) Limited | Extraterritorial | 2005 |
| M & G Developments (Wolverhampton) Limited | Construction | 2001 |
| M & H Site Services Limited | | 1994 |
| M & J News Limited | Wholesale & retail | 2010 |
| M & J Perks Enterprises Limited | Wholesale & retail | 2017 |
| M & K Auto Solutions Ltd | Wholesale & retail | 2014 |
| M & K Couriers Limited | Transport & logistics | 2013 |
| M & PS Property Limited | Real estate | 2015 |
| M & S Precision Grinding Services Limited | Professional & scientific | 2008 |
| M & S Sangha Ltd | Real estate | 2021 |
| M & T Classics Limited | Wholesale & retail | 2018 |
| M a Links & Digital Ltd | Professional & scientific | 2025 |
| M a P Powder Coating Limited | Manufacturing | 2013 |
| M a Walker Limited | Construction | 2006 |
| M Bradley QS Services Limited | Construction | 2011 |
| M C a Solutions Limited | Wholesale & retail | 2016 |
| M Dablar Ltd | Real estate | 2026 |
| M Daffern Building Services Ltd | Construction | 2018 |
| M F Transaport Ltd | Transport & logistics | 2015 |
| M G M Contracts Limited | Real estate | 2002 |
| M Garage Ltd | Wholesale & retail | 2023 |
| M Ghinescu Ltd | Transport & logistics | 2015 |
| M H Solicitors LLP | | 2017 |
| M Howells (Services) Limited | Construction | 2002 |
| M I Warehousing Ltd | Transport & logistics | 2020 |
| M J Couriers Ltd | Transport & logistics | 2024 |
| M J K Homes Limited | Professional & scientific | 2005 |
| M J Southwood Ltd | Construction | 2024 |
| M J Warren Dental Practice Ltd | Health & social care | 2015 |
| M Jackson & SON Ltd | Other services | 2014 |
| M K Construction (Midlands) Ltd | Construction | 2021 |
| M K S Construction Ltd | Construction | 2017 |