| Luxe Enterprise Ltd | Other services | 2018 |
| Luxe Homes and Developments Limited | Construction | 2020 |
| Luxo Doors Limited | Wholesale & retail | 2022 |
| Luxury Car Wash Ltd | Administrative & support | 2013 |
| Luxury Collection Resale Ltd | Wholesale & retail | 2023 |
| LVG Ventures Ltd | Information & communication | 2019 |
| LVS York Ltd | Hospitality | 2019 |
| LY Group Limited | Other services | 2023 |
| LYA Trans GLS Ltd | Transport & logistics | 2016 |
| LYC Brera Ltd | Transport & logistics | 2018 |
| Lydd Caravan Park Limited | Hospitality | 2017 |
| LYL Architectural Designs Ltd | Professional & scientific | 2020 |
| Lyla BS Property Limited | Real estate | 2023 |
| Lynch Equestrian Limited | Extraterritorial | 2025 |
| Lyndhurst Care Home Holdings Ltd | Real estate | 2024 |
| Lyndhurst Care Home Ltd | Health & social care | 2026 |
| Lyndhurst Prior RTM Company Ltd | Households | 2011 |
| Lyndis Health Company Ltd | Health & social care | 2024 |
| Lynmens Limited | Administrative & support | 2025 |
| Lynne Page Ltd | Arts & recreation | 2010 |
| Lynxexcel Ltd | Information & communication | 2014 |
| Lyons Roofing Solutions Limited | Construction | 2009 |
| M & BS Consultants Ltd | Information & communication | 2012 |
| M & D 1826 Ltd | Transport & logistics | 2017 |
| M & H Testing Limited | Professional & scientific | 2009 |
| M & J Hooper Limited | Construction | 2002 |
| M & M Development Services Limited | Administrative & support | 2001 |
| M & Mario Transport Limited | Transport & logistics | 2015 |
| M and C Consultancy Limited | Professional & scientific | 2007 |
| M Coles Construction Ltd | Construction | 2022 |
| M D Building Services (Maidstone) Ltd | Construction | 2018 |
| M D G London Limited | Manufacturing | 2016 |
| M D Lingard Marketing Consultancy Ltd | Professional & scientific | 2013 |
| M E Coffee Shop Limited | Hospitality | 2024 |
| M Edwards Consulting UK Ltd | Information & communication | 2023 |
| M F Drilling Services Ltd | Construction | 2023 |
| M French Construction Ltd | Construction | 2022 |
| M Hamilton Consulting Limited | Professional & scientific | 2016 |
| M Hart Construction Limited | Construction | 2013 |
| M HE Property Ltd | Real estate | 2015 |
| M Hill Carpentry Limited | Manufacturing | 2025 |
| M J Till Building Limited | Construction | 2026 |
| M Jenner & SON Limited | Construction | 2008 |
| M K Services (Kent) Limited | Professional & scientific | 2012 |
| M L Builders & Sons Limited | Administrative & support | 2012 |
| M P Joyce Limited | Construction | 2020 |
| M Restaurant Ltd | Hospitality | 2019 |
| M S Wainwright Electrical Contractors Ltd. | Construction | 2007 |
| M W Design and Build Ltd | Construction | 2025 |
| M Wells Consultancy Ltd | Professional & scientific | 2007 |
| M&A Elites Ltd | Construction | 2024 |
| M&C Services (SE) Limited | Administrative & support | 2012 |
| M&J Mochol Ltd | Extraterritorial | 2018 |
| M&L Rifaat Ltd | Health & social care | 2021 |
| M&M Air Conditioning Services Limited | Construction | 2007 |
| M&M South West Ltd | Construction | 2022 |
| M&N Content Management Ltd | Professional & scientific | 2025 |
| M&S Fried Chicken and Pizza Ltd | Hospitality | 2026 |
| M&T's Playhouse Ltd | Arts & recreation | 2026 |
| M-Square Consultant & Hospitality Limited | Hospitality | 2022 |
| M. Nord Ltd | Other services | 2023 |
| M. Perovic Ltd | Health & social care | 2024 |
| M. Walsom Construction Limited | Construction | 2010 |
| M. Wooding Limited | Wholesale & retail | 1979 |
| M.A. Piper & SON Farms Ltd | Agriculture & fishing | 2026 |
| M.A. Piper & SON Ltd | Agriculture & fishing | 2026 |
| M.A.P.S. Activities Ltd | Education | 2009 |
| M.Andrade Consulting Ltd | Professional & scientific | 2026 |
| M.E.H. Roofing Ltd | Construction | 2024 |
| M.G. Drury Limited | Administrative & support | 2007 |
| M.J. Eyelines Limited | Administrative & support | 2004 |
| M.J. Osborn F.R.I.C.S. Limited | Administrative & support | 2006 |
| M.J. Till Builders Limited | Construction | 2003 |
| M.Niko Ltd | Transport & logistics | 2017 |
| M.O. Gazi Limited | Hospitality | 2010 |
| M.R.V. Contracts Ltd | Construction | 2018 |
| M.Rowland Electrical Ltd | Construction | 2025 |
| M2 Padel Limited | Arts & recreation | 2026 |
| M22 Holdings Ltd | Financial services | 2019 |
| M3 Property Services Ltd | Real estate | 2023 |
| M4 Property Services Ltd | Hospitality | 2026 |
| MA Medical Global Limited | Health & social care | 2026 |
| MA Web Services Ltd | Information & communication | 2019 |
| Maat Projects Ltd | Professional & scientific | 2024 |
| Maav Services Ltd | Construction | 2025 |
| Mabelle Ltd | Education | 2025 |
| MAC Design Services Limited | Professional & scientific | 2017 |
| MAC Videography LLP | | 2021 |
| Mac's Scaffolding Ltd | Construction | 2017 |
| Macauley Dooley Limited | Manufacturing | 2024 |
| Macdonald Consultancy Limited | Construction | 2007 |
| Macem Group of Companies Ltd | Water & waste | 2025 |
| Macfford Networks Ltd | Information & communication | 2020 |
| Mach Computers Ltd | Wholesale & retail | 2014 |
| Macha MH UK Ltd | Administrative & support | 2023 |
| Mackelden Holdings Ltd | Financial services | 2023 |
| Mackintosh Investments Ltd | Financial services | 2026 |
| Macmillan Courier Services Limited | Transport & logistics | 2014 |
| Macmole Limited | Construction | 2023 |
| MACS2013 Limited | Professional & scientific | 2013 |