| LG Mechanical Limited | Construction | 2017 |
| Liau Consulting Limited | Professional & scientific | 2019 |
| Limestone Properties Ltd | Real estate | 2021 |
| Locket Estates Ltd | Real estate | 2002 |
| London Psychologist Ltd. | Health & social care | 2015 |
| Lotus Legal Limited | Professional & scientific | 2025 |
| LRP April Limited | Professional & scientific | 2019 |
| LSE Mayfair Ltd | Administrative & support | 2017 |
| Lucy Kutumane Limited | Health & social care | 2020 |
| Lummes Holdings Ltd | Financial services | 2024 |
| Lynn Port Developments Limited | Construction | 2004 |
| M Partners Limited | Wholesale & retail | 2006 |
| M.I Construction Training Ltd | Education | 2009 |
| M25 Power Platform Services Limited | Professional & scientific | 2006 |
| MAC Group Limited | Financial services | 2017 |
| Macgroup Contracts Ltd | Construction | 2026 |
| Magnum Electrical Ltd | Construction | 2017 |
| Magnum Energy Solutions Ltd | Construction | 2025 |
| Manoir Properties Limited | Construction | 2004 |
| Mark Cottingham Landscapes Limited | Administrative & support | 2008 |
| Marryat Limited | Administrative & support | 1996 |
| MB Estates Surrey Limited | Construction | 2019 |
| MBH Planning Limited | Financial services | 2020 |
| MCG Solutions Ltd | Construction | 2026 |
| Mcgemini Transport Limited | Transport & logistics | 2008 |
| Meal Solutions Ltd | Professional & scientific | 2009 |
| MEJ Real Estate Partner Ltd | Real estate | 2024 |
| MF Construction Solutions Limited | Construction | 2014 |
| MGH1 Ltd | Financial services | 2022 |
| MGR 1 Limited | Administrative & support | 2019 |
| MGR 2 Limited | Construction | 2024 |
| MGR EG Ltd | Other services | 2026 |
| MGR Enfield Ltd | Construction | 2024 |
| MGR Kent Limited | Construction | 2024 |
| MGR SW Ltd | Other services | 2026 |
| MHP Estates Ltd | Real estate | 2022 |
| Mirage Event Management Limited | Other services | 2011 |
| Mirage Events Ltd | Administrative & support | 2022 |
| Mirage Parties Limited | Other services | 2011 |
| Mirage Weddings Limited | Arts & recreation | 2011 |
| MJB Haulage Limited | Transport & logistics | 1979 |
| Montrose Brown Law Limited | Professional & scientific | 2025 |
| MOVE78 AI Limited | Extraterritorial | 2016 |
| Moviemobil Ltd | Information & communication | 2016 |
| MR Transport Services Ltd | Transport & logistics | 2025 |
| My Company Accounts Ltd | Professional & scientific | 2023 |
| Myevgo Ltd | Wholesale & retail | 2022 |
| N.E Carpentry Services Limited | Manufacturing | 2022 |
| N.S. Associates Ltd. | Information & communication | 1997 |
| Nemean Tale Studios Limited | Information & communication | 2018 |
| Nero Tiling Limited | Construction | 2015 |
| New ARK Care Services (UK) Ltd | Health & social care | 2023 |
| New Hamburg LLP | | 2011 |
| New Ventnor LLP | | 2011 |
| New Ventnor Reserve LLP | | 2018 |
| Newbarn Lane Management Company Limited | Households | 2024 |
| Nicholas Consultants Ltd | Wholesale & retail | 2017 |
| Nick Rodgers Financial Limited | Professional & scientific | 2003 |
| Nissaki Jewellery Ltd | Wholesale & retail | 2024 |
| Noood Limited | Wholesale & retail | 2013 |
| Noood London Limited | Wholesale & retail | 2013 |
| Nova Heating Ltd | Construction | 2025 |
| Nuurai Ltd | Professional & scientific | 2022 |
| NYX Strategic Holdings Limited | Financial services | 2026 |
| Oaks Property Investments Ltd | Real estate | 2025 |
| Ocean Films Limited | Other services | 2006 |
| Ontime Transport Services Ltd | Transport & logistics | 2024 |
| Osborne Braeside Limited | Households | 2026 |
| Oven Shiners Limited | Administrative & support | 2013 |
| P Squared Consultancy Solutions Limited | Professional & scientific | 2022 |
| Palladium 44 Enterprises Ltd | Professional & scientific | 2006 |
| Panorya Limited | Real estate | 2021 |
| Patience Plumbing & Heating Ltd | Construction | 2022 |
| Paul Roberts Consulting Limited | Financial services | 2007 |
| Pcmleo Bespoke Limited | Manufacturing | 2025 |
| Petersfield Road (Freehold) Limited | Extraterritorial | 2007 |
| Philippa Tuck Limited | Professional & scientific | 2022 |
| Pilgrim Harps Limited | Wholesale & retail | 2026 |
| Pinehawk Limited | Real estate | 2000 |
| POD Biomechanics Limited | Health & social care | 2021 |
| Powell Contracting Ltd | Construction | 2025 |
| Power Platform Services Ltd | Administrative & support | 1981 |
| Prest Estates Limited | Other services | 1997 |
| Pro Body Medical Ltd | Other services | 2024 |
| Project X Partners Limited | Professional & scientific | 2020 |
| Proreg Solutions Ltd | Professional & scientific | 2024 |
| PRT Building Ltd | Construction | 2015 |
| Psquared Capital Ltd | Professional & scientific | 2024 |
| Pure Heritage Ltd | Agriculture & fishing | 2022 |
| Quitkick LLP | | 2007 |
| R.R. Trading Surrey Ltd | Administrative & support | 2025 |
| RA Advertising Limited | Professional & scientific | 1989 |
| Ranger Accounting Limited | Professional & scientific | 2009 |
| Rastegar International Law Group & Associates Ltd | Professional & scientific | 2023 |
| Rbtdistribution Ltd | Wholesale & retail | 2023 |
| Reagency Ltd | Information & communication | 2019 |
| Regency Design & Print Limited | Information & communication | 1985 |
| Reliable Airport Cars Limited | Transport & logistics | 2024 |
| REO Investment Properties Ltd | Real estate | 2025 |
| Return to Heart Ltd | Health & social care | 2025 |