| Legit Innovations Limited | Information & communication | 2011 |
| Legit Templates Ltd | Information & communication | 2011 |
| LFG Groundworks Ltd | Construction | 2017 |
| LFG Properties Ltd | Real estate | 2024 |
| Little Grange Management Co. | Administrative & support | 1987 |
| Little Snug Homes Limited | Construction | 2019 |
| LJ Cooling Ltd | Construction | 2026 |
| Lolos Services Ltd | Construction | 2026 |
| London Classic Theatre Limited | Arts & recreation | 2016 |
| Londons Top Removals Ltd | Transport & logistics | 2026 |
| Luminique Solutions Group Ltd | Professional & scientific | 2026 |
| M & M Property Sourcing Ltd | Real estate | 2022 |
| M Z Contracts Ltd | Construction | 2017 |
| Magnolia Court Management Limited | Households | 1972 |
| Makalu Recordings Ltd | Information & communication | 2025 |
| Margate Brown IT Consulting Ltd | Information & communication | 2023 |
| Matterlodge Limited | Real estate | 1999 |
| Maxima Accountancy Limited | Professional & scientific | 2018 |
| Maze Contracting Ltd | Construction | 2021 |
| Mcintyre Estates Limited | Real estate | 2005 |
| MD2 Limited | Real estate | 2017 |
| MDT Installations Ltd | Construction | 2021 |
| MEC2 Limited | Professional & scientific | 2008 |
| Meqwan Pictures Limited | Information & communication | 2015 |
| Midland Investments Limited | Real estate | 1979 |
| Mixology Express Ltd | Wholesale & retail | 2023 |
| ML Private Client Consultancy Ltd | Professional & scientific | 2023 |
| MLE Group Ltd | Wholesale & retail | 2026 |
| Moloney Technologies Limited | Professional & scientific | 2007 |
| Molotov Consulting Limited | Information & communication | 2020 |
| Montoya (Properties) Limited | Administrative & support | 2002 |
| Montoya Limited | Professional & scientific | 2001 |
| Motiv Search & Recruitment (UK) Limited | Administrative & support | 2022 |
| Murawski Architecture Studio Ltd | Professional & scientific | 2021 |
| Musiclaw Limited | Professional & scientific | 2007 |
| Mustard Seed Day Care Limited | Health & social care | 2026 |
| Myway Plumbing & Heating Ltd | Construction | 2026 |
| MZ Property Investments Limited | Real estate | 2021 |
| Napier Court Management (Croydon) Limited | Households | 2010 |
| NAV Taxi Ltd | Transport & logistics | 2023 |
| Netzero Horizon Ltd | Professional & scientific | 2025 |
| New Crescent Yard (Management) Limited | Households | 2002 |
| Newlands RTM Company Limited | Households | 2021 |
| Newlands Woods Management Limited | Households | 1970 |
| Next GEN Surfacing Solutions Ltd | Construction | 2025 |
| NN Touring LLP | | 2013 |
| Norbury (London Road) Management Limited | Households | 1974 |
| Northern Heights Freehold Limited | Households | 2008 |
| NOW Distribution Limited | Administrative & support | 1989 |
| NOW Games Europe Limited | Information & communication | 2009 |
| NOW Wireless Limited | Information & communication | 2000 |
| Nurture and Nest Maternity Support Ltd | Health & social care | 2026 |
| O'Keeffe's Properties Ltd | Real estate | 2017 |
| Oakbrook Management Company Limited | Households | 1988 |
| Oakbrook Property Limited | Households | 2004 |
| Oakhurst Flats Management (Beckenham) Limited | Households | 1975 |
| Oakleaf Lofts Limited | Construction | 2010 |
| Oatiefull Trading Limited | Manufacturing | 2025 |
| Oceans London | Other services | 2019 |
| Offbeat Creative Ltd | Professional & scientific | 2023 |
| OFS Music Ltd | Information & communication | 2022 |
| OIL & GAS Verification Limited | Professional & scientific | 2013 |
| Omega (U.K.) Holdings Limited | Professional & scientific | 1984 |
| Omega Group Management Services Limited | Professional & scientific | 1980 |
| Orchard Way(Shirley)(Courts A&B)Residents Association Limited | Households | 1967 |
| Orchard Way(Shirley)(Courts E,F,G)Residents Association Limited | Households | 1967 |
| Owen Epstein Limited | Health & social care | 2012 |
| P Jolliffe & Co. Limited | Professional & scientific | 2002 |
| P R Futures LLP | | 2014 |
| Parkleigh Limited | Real estate | 2009 |
| Parkmere Management Limited | Households | 1969 |
| Passco C.I.C. | Professional & scientific | 2002 |
| PCW Roofing and Building Services Limited | Construction | 2025 |
| PDM Analysis Limited | Professional & scientific | 2014 |
| Pearl Noir Consultancy Ltd | Professional & scientific | 2023 |
| Pennycroft (Addington) Estate Management Limited | Households | 1976 |
| Pennycroft (Freehold ) Limited | Households | 2000 |
| Petalord Limited | Households | 1981 |
| Pinkerton Place Freehold Limited | Households | 2020 |
| PJP Development Consultancy Limited | Professional & scientific | 2017 |
| Precisionplus Limited | Construction | 2024 |
| Presentus Limited | Administrative & support | 2021 |
| Primebeready Ltd | Health & social care | 2023 |
| Priory Cooling Solutions Limited | Construction | 2016 |
| Priory Design Solutions Ltd | Construction | 2018 |
| Priory Electrical Services Limited | Construction | 2021 |
| Priory Environmental Services Limited | Construction | 1975 |
| Priory Group Holdings Limited | Professional & scientific | 1990 |
| Priory Mechanical Services Limited | Construction | 1973 |
| Priory Special Projects Limited | Construction | 2021 |
| Priory Ventilation Services Limited | Construction | 2021 |
| Pro Axis Group Ltd | Construction | 2026 |
| Probms Ltd | Construction | 2026 |
| Prospect Heating & GAS Limited | Construction | 2023 |
| Prym London Ltd | Wholesale & retail | 2022 |
| Pure Green Plumbing & Heating Limited | Administrative & support | 2009 |
| Purley Court RTM Company Limited | Households | 2004 |
| Purley Gates Management Limited | Households | 1987 |
| Qualitree Ltd | Agriculture & fishing | 2020 |
| R/S PUB Services Ltd | Hospitality | 2024 |