| Luna Reframed Ltd | Arts & recreation | 2020 |
| Lunebridge Holding Ltd | Financial services | 2026 |
| Lunexa Consulting Ltd | Professional & scientific | 2025 |
| Lunn Fire Protection Limited | Public administration | 2023 |
| Lunness Properties Limited | Construction | 2023 |
| Lupa Property Trading Ltd | Construction | 2025 |
| Lupfaw 445 Limited | Financial services | 2017 |
| Lusbuild Construction Limited | Construction | 2020 |
| Lusso Development & Management Services Limited | Construction | 2024 |
| Lusso Nautica Ltd | Real estate | 2025 |
| Lussu Developments Ltd | Construction | 2021 |
| Lustrous Cleans Ltd | Administrative & support | 2023 |
| Luta & Dany Trans Ltd | Transport & logistics | 2015 |
| Luto Developments Ltd | Real estate | 2024 |
| Luvero Limited | Financial services | 2025 |
| Luwo Mortgage Ltd | Financial services | 2024 |
| Luwo Property Ltd | Real estate | 2021 |
| LUX Estates & Property Ltd | Real estate | 2025 |
| LUX Park Limited | Construction | 2021 |
| LUX Pet Ltd | Wholesale & retail | 2026 |
| LUX Plates Ltd | Wholesale & retail | 2025 |
| Lux-Hom Ltd | Wholesale & retail | 2018 |
| Luxe Hair, Beauty and Aesthetics Limited | Other services | 2023 |
| Luxe Prestige Ltd | Administrative & support | 2020 |
| Luxe Property Consulting Ltd | Real estate | 2025 |
| Luxe Space Ltd | Professional & scientific | 2025 |
| Luxelash&Smilestudio Limited | Other services | 2025 |
| LUXELOOP90 Limited | Wholesale & retail | 2025 |
| Luxeregal Properties Ltd | Real estate | 2024 |
| Luxetints Solutions Ltd | Other services | 2025 |
| Luxeva Menswear Ltd | Manufacturing | 2026 |
| Luxground Group Limited | Wholesale & retail | 2026 |
| Luxury Garden Escapes Limited | Manufacturing | 2025 |
| Luxury Motorhomes SPV Ltd | Wholesale & retail | 2024 |
| LUZ Solar 1 Limited | Professional & scientific | 2025 |
| LUZ Solar Limited | Construction | 2022 |
| Lvgts Limited | Wholesale & retail | 2018 |
| LVI Services Ltd | Transport & logistics | 2019 |
| Lvpll Limited | Wholesale & retail | 2026 |
| LW Couriers Ltd | Transport & logistics | 2024 |
| LW Illustrates Limited | Arts & recreation | 2025 |
| LW Solutions Ltd | Information & communication | 2018 |
| LWJ Joinery Ltd | Construction | 2002 |
| LWR Roofing Specialists Ltd | Construction | 2025 |
| Lyla Trans Ltd | Transport & logistics | 2019 |
| Lyme Gardens (Stoke-On-Trent) Management Company Limited | Households | 2016 |
| Lync Together CIC | Health & social care | 2022 |
| Lyndale Group Limited | Construction | 2019 |
| Lynden Logistics Ltd | Transport & logistics | 2021 |
| Lyndos Creative Ltd | Education | 2019 |
| Lyndsay Robinson Ltd | Information & communication | 2021 |
| Lynn Stanbridge Consultancy Ltd | Education | 2010 |
| Lynqora Technologies Ltd | Extraterritorial | 2026 |
| Lynx Classic Buses Ltd | Transport & logistics | 2025 |
| Lynx Electrical and Security Limited | Manufacturing | 2016 |
| Lyric Health Consulting Limited | Professional & scientific | 2025 |
| Lythgoe Logistics Ltd | Transport & logistics | 2015 |
| Lzpf Ltd | Professional & scientific | 2023 |
| M & a Egyptian Home Improvements Limited | Real estate | 2020 |
| M & a Paving Limited | Construction | 2002 |
| M & D Concrete Limited | Manufacturing | 2009 |
| M & D Foundations & Building Services Limited | Construction | 1999 |
| M & D Foundations (Midlands) Limited | Construction | 2006 |
| M & D Foundations Limited | Extraterritorial | 2005 |
| M & DG Haulage Ltd | Transport & logistics | 2016 |
| M & G Auto Electrics (Doncaster) Limited | Wholesale & retail | 2002 |
| M & K Pizza Limited | Hospitality | 2025 |
| M & KM Ltd | Wholesale & retail | 2021 |
| M & M P Housing Ltd | Public administration | 2006 |
| M & R Energy Ltd | Construction | 2014 |
| M & R Industries Ltd | Construction | 2024 |
| M & S Fencing Ltd | Construction | 2018 |
| M & T Mitchell Properties Ltd | Real estate | 2018 |
| M & T Premium Lawn and Landscape Ltd | Administrative & support | 2026 |
| M a Knights Associates Limited | Financial services | 2011 |
| M and C Wilkinson Ltd | Wholesale & retail | 1997 |
| M and J Trade Cars Ltd | Wholesale & retail | 2022 |
| M and N Properties Doncaster Limited | Real estate | 2025 |
| M and R Groundworks Limited | Construction | 1998 |
| M Atherton Builders Limited | Construction | 2017 |
| M B Automotive (UK) Limited | Other services | 2005 |
| M B Joinery and Fitting Specialists Limited | Construction | 2016 |
| M Barber 25 Limited | Other services | 2025 |
| M Beecroft Holdings Ltd | Financial services | 2025 |
| M Bennett Electrical Limited | Construction | 2019 |
| M Bint Limited | Financial services | 2020 |
| M Borys Construction & Transport Ltd | Construction | 2015 |
| M Brookes Contracts Ltd | Construction | 2017 |
| M C Communications Ltd | Information & communication | 2021 |
| M Colley Co Limited | Hospitality | 2018 |
| M Cooper (Vanity Hair) Ltd | Other services | 2014 |
| M D Edwards Bridge Parapet Ltd | Manufacturing | 2022 |
| M D M Investments Limited | Administrative & support | 1985 |
| M D Windows Limited | Construction | 2002 |
| M Deen Autos Limited | Wholesale & retail | 2024 |
| M F Geraghty (Racing) Limited | Arts & recreation | 1974 |
| M F Plant Limited | Wholesale & retail | 2008 |
| M G D Rail and Welding Consultants Limited | Professional & scientific | 2025 |
| M Gelder Limited | Financial services | 2002 |
| M Glass TM Ltd | Public administration | 2022 |