| Lucid Crystal Limited | Information & communication | 2013 |
| Lucky 87 Limited | Manufacturing | 2018 |
| Lucky Land Limited | Real estate | 2018 |
| Lucky Locksmiths Ltd | Administrative & support | 2025 |
| Lucky Nails 66 Ltd | Other services | 2024 |
| Ludarius Ltd | Manufacturing | 2025 |
| Luggage Retail Outlet Shop Ltd | Wholesale & retail | 2024 |
| Luisa&Samuel Ltd | Real estate | 2025 |
| Lukas Group Ltd | Construction | 2026 |
| Lukas.G Decorating Ltd | Construction | 2020 |
| Luke Everson Limited | Information & communication | 2013 |
| Lukk Trans Limited | Transport & logistics | 2014 |
| Lullingstone Water Limited | Water & waste | 1983 |
| Lume Collective Group Ltd | Health & social care | 2026 |
| Lumexara Group Ltd | Wholesale & retail | 2026 |
| Luminaire Publishing Ltd | Information & communication | 2025 |
| Lumitel Limited | Professional & scientific | 2018 |
| Luna & Sunny Limited | Hospitality | 2010 |
| Lunainvent Ltd | Information & communication | 2025 |
| Lund London Ltd | Wholesale & retail | 2014 |
| Lush Consulting Ltd | Wholesale & retail | 2019 |
| Lush Corporate Services Ltd | Professional & scientific | 2018 |
| Lushelle Limited | Wholesale & retail | 2022 |
| Luvyi Ltd | Wholesale & retail | 2019 |
| LUX Consultants Ltd | Construction | 2021 |
| LUX Developments London Ltd | Construction | 2021 |
| LUX Stay Apartments Ltd | Real estate | 2022 |
| Luxe Cleaning Limited | Administrative & support | 2021 |
| Luxe Decorating Services Ltd | Construction | 2022 |
| Luxe Faces Ltd | Other services | 2025 |
| Luxe London Chauffeurs Ltd | Transport & logistics | 2025 |
| Luxe Showhome Solutions Limited | Administrative & support | 2025 |
| Luxenurze Limited | Health & social care | 2025 |
| Luxmi Consulting Ltd | Real estate | 2024 |
| Luxury of Wealth Ltd | Wholesale & retail | 2023 |
| Luxury Properties (London) Limited | Real estate | 2023 |
| Luxury Rooms Express Ltd | Real estate | 2020 |
| Luxury Travel Studio Limited | Administrative & support | 2018 |
| LV Property Maintenance Ltd | Construction | 2024 |
| Lv's Foods Limited | Hospitality | 2019 |
| Lvdt Services Ltd | Transport & logistics | 2023 |
| LWA Management Services Ltd | Other services | 2025 |
| LWS & Sons Group Ltd | Construction | 2026 |
| LWS Plumbing & Heating Ltd | Construction | 2024 |
| LXT Properties Limited | Real estate | 2024 |
| LY Audiovisual Services Ltd | Construction | 2022 |
| Lydia Management Limited | Information & communication | 2023 |
| LYH Property Consultants Ltd | Real estate | 2017 |
| Lynton Property Management Ltd | Real estate | 2019 |
| Lytheran Ltd | Professional & scientific | 2025 |
| M & a (Pizza) Limited | Hospitality | 2011 |
| M & a Carpentry Contractors Ltd | Construction | 2022 |
| M & B Freehold Limited | Households | 1997 |
| M & BTY Ltd., Ltd | Other services | 2025 |
| M & J Design & Build Limited | Construction | 2009 |
| M & M Properties(Kent) Limited | Real estate | 2022 |
| M Beauty Holdco Limited | Financial services | 2021 |
| M Charles Limited | Real estate | 2025 |
| M Eleven Ltd. | Transport & logistics | 2017 |
| M Epps Blackheath Limited | Real estate | 2007 |
| M F Vehicle Inspections Limited | Professional & scientific | 2014 |
| M G S Autos S.E. Limited | Wholesale & retail | 2012 |
| M GOE Ltd | Transport & logistics | 2022 |
| M Group Build Limited | Construction | 2023 |
| M H Property Services Kent Limited | Households | 2026 |
| M K Contract Flooring (UK) Ltd | Construction | 2014 |
| M Kasso Ltd | Wholesale & retail | 2022 |
| M Lambourne Holdings Ltd | Other services | 2013 |
| M M J Agency Ltd. | Wholesale & retail | 2010 |
| M Squared Management Ltd | Other services | 2015 |
| M Stewart Building Contractors Ltd | Construction | 2025 |
| M&B Newsagents Limited | Other services | 2019 |
| M&E Ductwork Services Limited | Construction | 2021 |
| M&G Mechanical Ltd | Construction | 2023 |
| M&P Technical Services Limited | Professional & scientific | 2014 |
| M&R Skip Hire Limited | Water & waste | 2018 |
| M'Cube Global Limited | Financial services | 2025 |
| M'Cube Investments Ltd | Real estate | 2022 |
| M'Cube Plus Limited | Financial services | 2024 |
| M-Group Building Ltd | Construction | 2026 |
| M. a. Design Products Ltd | Wholesale & retail | 2013 |
| M. E. D. Management Limited | Real estate | 1990 |
| M.B.Tantoco Limited | Health & social care | 2014 |
| M.Eyob Consulting Ltd | Professional & scientific | 2019 |
| M.Y.V.G Ltd | Hospitality | 2023 |
| M2I Construction Ltd | Construction | 2023 |
| M3 Plumbing & Heating Ltd | Construction | 2022 |
| MA Healthcare Support Ltd | Administrative & support | 2023 |
| MAA Media Limited | Information & communication | 2013 |
| Maak Fm&Cleaning Limited | Administrative & support | 2025 |
| MAB Investment Property Limited | Real estate | 2019 |
| Mabesco Limited | Construction | 2015 |
| MAC Heating Solutions Ltd | Construction | 2017 |
| MAC Recovery 24-7 Ltd | Transport & logistics | 2024 |
| Macan Properties Ltd | Real estate | 2019 |
| Macarooner Ltd | Manufacturing | 2019 |
| Mace Digital Ltd | Professional & scientific | 2025 |
| Mack Services Limited | Administrative & support | 2024 |
| Macmilan Carpentry Limited | Manufacturing | 2022 |
| Macrais Ltd | Construction | 2026 |