| LW Flooring Ltd | Other services | 2016 |
| LW Force Limited | Administrative & support | 2013 |
| Lwk.Sevices Ltd | Administrative & support | 2023 |
| LX Pantos U.K. Limited | Transport & logistics | 2004 |
| LXB Ltd | Transport & logistics | 2016 |
| LXC Detailing Ltd | Wholesale & retail | 2025 |
| Lychgate House Care Limited | Health & social care | 2020 |
| Lychgate Management Company Limited | Households | 1999 |
| Lydcaskim Ltd | Health & social care | 2015 |
| Lydmak Ltd | Health & social care | 2018 |
| Lydsey Close 1969 Limited | Extraterritorial | 2014 |
| Lyell's of London Limited | Wholesale & retail | 1998 |
| LYF Pharmaceuticals Ltd | Wholesale & retail | 2025 |
| Lyft Ltd | Transport & logistics | 2024 |
| Lyncroft Group Ltd | Administrative & support | 2015 |
| Lynn Nails Burnham Limited | Other services | 2014 |
| Lynn Nails Limited | Other services | 2011 |
| Lyntratech UK Ltd | Information & communication | 2026 |
| Lynx Investments(Uk) Ltd | Construction | 2011 |
| Lynx Prestige Detailing Ltd | Administrative & support | 2025 |
| Lyons Dock Media Ltd | Information & communication | 2026 |
| LYP Transport Ltd | Transport & logistics | 2026 |
| Lyraplatform Ltd | Information & communication | 2019 |
| M $ M Ltd | Wholesale & retail | 2026 |
| M & Baig Ltd | Wholesale & retail | 2022 |
| M & R Goodman Limited | Transport & logistics | 2003 |
| M & Z Property Management Ltd | Real estate | 2022 |
| M a Awan Law Associates Ltd | Professional & scientific | 2024 |
| M a Qureshi Ltd | Hospitality | 2023 |
| M and J Tree Specialists Ltd | Other services | 2018 |
| M B C and C Management Ltd | Construction | 2020 |
| M B DIY Electronics Ltd | Administrative & support | 2022 |
| M Bobo Ltd | Health & social care | 2018 |
| M Construction UK Limited | Construction | 2004 |
| M Dawood Security Ltd | Administrative & support | 2025 |
| M Free International Ltd | Administrative & support | 2017 |
| M H Construction Builders Ltd | Construction | 2025 |
| M Humphrey Limited | Professional & scientific | 2010 |
| M Ideal Traders Limited | Wholesale & retail | 2026 |
| M J Cars Ltd | Transport & logistics | 2013 |
| M J Fruit and Vegitable Ltd | Wholesale & retail | 2025 |
| M J RAI Builders Limited | Construction | 2021 |
| M Khal Properties Limited | Real estate | 2025 |
| M Kumar Construction Ltd | Construction | 2025 |
| M P S Property (UK) Limited | Manufacturing | 2010 |
| M Riaz Dental Ltd | Health & social care | 2021 |
| M S J Transport by Heavy & Light Trucks Ltd | Transport & logistics | 2025 |
| M Souter Haulage Ltd | Water & waste | 2026 |
| M T Traders Limited | Other services | 2025 |
| M&G London Ltd | Real estate | 2016 |
| M&H Brickworks Ltd | Construction | 2020 |
| M&H Slough Ltd | Hospitality | 2026 |
| M&M Building Services Ltd | Construction | 2022 |
| M&M Consultancy Group UK Ltd | Professional & scientific | 2024 |
| M&M Distributors Ltd | Wholesale & retail | 2018 |
| M&M Focus Ltd | Construction | 2021 |
| M&M Middlesex Services Ltd | Education | 2014 |
| M&M Serene Ltd | Health & social care | 2023 |
| M&M Services Berkshire Ltd | Administrative & support | 2026 |
| M&P Builders Ltd | Construction | 2025 |
| M&R Dealings Ltd | Hospitality | 2023 |
| M&S Garg Properties Ltd | Real estate | 2025 |
| M&S Gill Ltd | Transport & logistics | 2020 |
| M&S Global Services Ltd | Wholesale & retail | 2024 |
| M&S Medical Limited | Health & social care | 2023 |
| M&Z Trading Ltd | Wholesale & retail | 2022 |
| M- Masoom Limited | Wholesale & retail | 2013 |
| M-Red Logistics Ltd | Transport & logistics | 2016 |
| M-Tec Automotive Ltd | Wholesale & retail | 2023 |
| M-Tech Solutions Ltd | Information & communication | 2025 |
| M. G. Ayala Ontiveros Ltd | Professional & scientific | 2024 |
| M. J. Hickey (Plant Hire) Limited | Administrative & support | 1987 |
| M.Aamir Limited | Health & social care | 2025 |
| M.K Carz Ltd | Wholesale & retail | 2021 |
| M.P.C (Slough) Ltd | Real estate | 2014 |
| M.R Consultancy Ltd | Real estate | 2015 |
| M.S. Chahal & Sons (Holdings) Limited | Financial services | 2016 |
| M.S. Merchandising Limited | Professional & scientific | 2021 |
| M.Sandhu Roofing Ltd | Construction | 2014 |
| M.T.M Fuel Energy Logistics Ltd | Construction | 2017 |
| M.W.Jones Ltd | Information & communication | 2023 |
| M100 Ltd | Wholesale & retail | 2024 |
| M20 Services Ltd | Transport & logistics | 2023 |
| M4 Builders Limited | Construction | 2025 |
| M4 Glazing Limited | Administrative & support | 2017 |
| M4 Motor Group -UK Ltd | Wholesale & retail | 2025 |
| M4 Movers Ltd | Transport & logistics | 2026 |
| M4 Scaffolding Hire Ltd | Construction | 2018 |
| M4'NYO Ltd | Health & social care | 2015 |
| M40 Scaffolding Ltd | Construction | 2014 |
| M6M Limited | Information & communication | 2026 |
| M7 Trading Limited | Wholesale & retail | 2020 |
| MA Baba Ltd | Real estate | 2024 |
| MA Accountancy Services Ltd | Professional & scientific | 2013 |
| MA Commercial Limited | Real estate | 2026 |
| MA Consultancy PVT Ltd | Real estate | 2026 |
| MA Logistics World Ltd | Transport & logistics | 2015 |
| MA Services(Carlisle) Ltd | Transport & logistics | 2024 |
| MA Sharda Ltd | Information & communication | 2006 |
| MA Traders Ltd | Wholesale & retail | 2015 |