| Luxuria Interiors Group Limited | Administrative & support | 2023 |
| Luxury Italian Living Ltd | Construction | 2014 |
| Luxury Nails 102 Ltd | Other services | 2026 |
| Luxury Nails 30 Ltd | Other services | 2023 |
| Luxy Images Limited | Arts & recreation | 2016 |
| LW Estate Management Ltd | Households | 2025 |
| LXO Creations Ltd | Wholesale & retail | 2026 |
| Lyes Electrical Ltd | Construction | 2019 |
| LYK Capital Ltd | Real estate | 2023 |
| Lymburn Rebman Limited | Real estate | 2014 |
| Lynch Construction Limited | Extraterritorial | 1974 |
| Lyncot Services Limited | Information & communication | 1999 |
| Lynk Data Systems Limited | Information & communication | 1997 |
| Lynton Hotel (London) Limited | Hospitality | 2002 |
| Lynx Express Couriers Ltd | Transport & logistics | 2016 |
| Lynx Express Logistics Ltd | Transport & logistics | 2018 |
| Lynx Group Ltd | Transport & logistics | 2018 |
| Lyrae Consultancy Ltd | Professional & scientific | 2019 |
| LZ International Ltd | Professional & scientific | 2020 |
| M & B Drainage Ltd | Construction | 2025 |
| M & D Stockley Holdings Ltd | Financial services | 2020 |
| M & F Enterprise Ltd | Health & social care | 2012 |
| M & M (Kent) Holdings Ltd | Financial services | 2022 |
| M & M Medical and Training Ltd | Health & social care | 2025 |
| M & N Training and Development Limited | Professional & scientific | 2024 |
| M & N UDI Limited | Information & communication | 2018 |
| M & S Lettings Limited | Real estate | 2017 |
| M & V Consultancy Limited | Professional & scientific | 2013 |
| M a Clare Holdings Limited | Financial services | 2025 |
| M a Compliance Solutions Limited | Information & communication | 2016 |
| M a Property Rentals Limited | Real estate | 2020 |
| M and a Investments (S.E) Limited | Real estate | 2023 |
| M and D Phillips Properties Ltd | Real estate | 2024 |
| M B D Properties Limited | Real estate | 2021 |
| M Breen Property Limited | Real estate | 2016 |
| M Butler Limited | Transport & logistics | 2020 |
| M C Motors Holdings Limited | Financial services | 2023 |
| M C Motors Limited | Administrative & support | 2010 |
| M Caffe Limited | Hospitality | 2026 |
| M Capital Investments Limited | Wholesale & retail | 2014 |
| M Crocker Brickwork Ltd | Construction | 2025 |
| M Dunster Management Ltd | Transport & logistics | 2025 |
| M E Vehicle Repairs Ltd | Wholesale & retail | 2024 |
| M H Recruitment Limited | Administrative & support | 2017 |
| M Johnson Building & Restoration Ltd | Construction | 2025 |
| M K Convenience Store Ltd | Wholesale & retail | 2016 |
| M Kash Trading Limited | Wholesale & retail | 2016 |
| M Richards Building & Roofing Ltd | Construction | 2021 |
| M Riverside Public House Ltd | Hospitality | 2024 |
| M S a Build Limited | Construction | 2002 |
| M S Atlantic Logistics Ltd | Administrative & support | 2018 |
| M Scott Electrical Ltd | Construction | 2016 |
| M T Electrical Engineers Ltd | Construction | 2016 |
| M&A Electrical Services Ltd | Construction | 2022 |
| M&Aa Development (Buckingham) Limited | Construction | 2013 |
| M&I Laborer Supply Ltd | Administrative & support | 2025 |
| M&J Care & Recruitment Services Ltd | Health & social care | 2020 |
| M&M Kent Services Ltd | Construction | 2019 |
| M&M Management Services Limited | Professional & scientific | 2015 |
| M&M Pet Supplies Ltd | Wholesale & retail | 2025 |
| M&R Homes Development Ltd | Construction | 2020 |
| M&S Maintenance Limited | Professional & scientific | 2015 |
| M&Vj Group Ltd | Wholesale & retail | 2025 |
| M&W Rentals LLP | | 2026 |
| M. Moate Properties Ltd | Real estate | 2022 |
| M. O'Dell Limited | Manufacturing | 2008 |
| M. R. Painting Services Limited | Construction | 2021 |
| M. Signworx Limited | Manufacturing | 1998 |
| M.B.S. Property Management Limited | Real estate | 1992 |
| M.C International Haulage Limited | Construction | 2011 |
| M.C.R. (Building Contractors) Limited | Construction | 1997 |
| M.E.C. 2001 Ltd | Manufacturing | 2007 |
| M.J. Allen Automotive Ltd | Wholesale & retail | 1984 |
| M.J. Allen Castings and Machining Ltd | Professional & scientific | 1989 |
| M.J. Allen Holdings Limited | Professional & scientific | 1961 |
| M.J. Allen Metalwork Ltd | Manufacturing | 1996 |
| M.J. Allen Precision Ltd | Manufacturing | 1987 |
| M.K. Accident Repair Ltd | Wholesale & retail | 2019 |
| M.L.G. Engineering Limited | Wholesale & retail | 2006 |
| M.M Plumbing & Heating Services Ltd | Construction | 2018 |
| M.O.T. Textiles Limited | Manufacturing | 2016 |
| M.P.C Electrical Installations Limited | Construction | 2017 |
| M.R Consultancies Ltd | Extraterritorial | 2022 |
| M.R. Bricks Ltd | Wholesale & retail | 2002 |
| M.S. Ealham Limited | Construction | 2002 |
| M.S.(Kent) Ltd | Wholesale & retail | 2014 |
| M.T. Carpentry Limited | Construction | 2014 |
| M.V.M Private Ltd | Health & social care | 2016 |
| M1 1HP Ltd | Hospitality | 2023 |
| M2 Ashford Ltd | Hospitality | 2023 |
| M20 Assist Ltd | Transport & logistics | 2026 |
| M4 5FE Ltd | Real estate | 2023 |
| MA Passion Consultancy Limited | Administrative & support | 2009 |
| Maaas Investment Ltd | Professional & scientific | 2026 |
| Maambena Village CIC | Public administration | 2021 |
| Maarla Financials Limited | Financial services | 2017 |
| Mabel Construction Limited | Construction | 2016 |
| Mabel Electrical Ltd | Construction | 2025 |
| Mabel Makes Limited | Manufacturing | 2023 |
| Mabelice Ltd | Manufacturing | 2025 |