| Kingsmoor Anglers Limited | Agriculture & fishing | 1966 |
| KP & SF Projects Limited | Construction | 2022 |
| KST Cleaning Services Ltd | Administrative & support | 2025 |
| KST Tech Services Ltd | Other services | 2011 |
| Kyriba UK Ltd | Information & communication | 2012 |
| Lakha Scaffolding Limited | Construction | 2017 |
| Lammas Drive Residents Association Limited | Households | 1992 |
| Landmark Brickwork Limited | Construction | 2000 |
| Lanlink Limited | Information & communication | 2008 |
| Lansdowne Ahbms Ltd | Construction | 2013 |
| Lansdowne Airconditioning, Heating and Building Maintenance Services . Ltd | Construction | 2011 |
| Legra Services Limited | Other services | 1976 |
| LES Deux Amis Limited | | 1985 |
| Levante Composites Ltd | Other services | 2021 |
| Lightbulbhr Limited | Professional & scientific | 2010 |
| Lions World Management Services Limited | Real estate | 1975 |
| Lismore Court (Staines) Limited | Households | 2023 |
| LMB Professionals Ltd | Professional & scientific | 2014 |
| Lnem Limited | Information & communication | 2007 |
| LNP Karate Limited | Arts & recreation | 2006 |
| London College of Innovation Ltd | Education | 2025 |
| London Heathrow Properties Limited | Real estate | 2012 |
| Lowery Group Limited | Extraterritorial | 2015 |
| Lowery Holdings Limited | Extraterritorial | 1964 |
| Lowery International Contractors Limited | Extraterritorial | 1977 |
| Lowery Limited | Construction | 1950 |
| Lowery Newco Limited | Extraterritorial | 2006 |
| Lowery Plant Limited | Extraterritorial | 2001 |
| Lowery Power Systems Limited | Extraterritorial | 2007 |
| Lowery Transport Limited | Administrative & support | 1972 |
| Luqom UK Ltd | Manufacturing | 2021 |
| M&E Integrated Limited | Administrative & support | 2009 |
| Maenet Ltd | Information & communication | 2012 |
| Major London Plumbing Ltd | Other services | 2014 |
| Manelia Holdings Limited | Real estate | 1998 |
| Manelia Limited | Real estate | 1979 |
| Mannofield Finance Limited | Professional & scientific | 1960 |
| Maplebrook Limited | | 1990 |
| Master Steel Services Ltd | Construction | 2020 |
| Mathew Jacob Consultancy Ltd | Information & communication | 1996 |
| Mclaren & Co Properties Ltd | Real estate | 2017 |
| Mehra Investments Limited | Real estate | 2020 |
| Micro London Ltd | Manufacturing | 2023 |
| Midasplus | Other services | 2005 |
| ML Vehicles Limited | Wholesale & retail | 2024 |
| Moran Surveyors Limited | Professional & scientific | 2011 |
| Mori Mori Studio Limited | Information & communication | 2020 |
| Morris Roofing Contractors Ltd | Construction | 2003 |
| Muslim Chaplains' Association Ltd | Other services | 2008 |
| MVA Veterinary Services Limited | Professional & scientific | 2020 |
| MW Facilities Limited | Information & communication | 2014 |
| Narrowcraft Limited | Manufacturing | 2013 |
| Nemin Two Limited | Information & communication | 2017 |
| Neorick Ltd | Information & communication | 2023 |
| Newlands (Rookery Road) Limited | Households | 1998 |
| Nexport Global Ltd | Wholesale & retail | 2025 |
| Next GEN Usmle Ltd | Wholesale & retail | 2025 |
| Niceic Limited | Real estate | 2005 |
| Nithiyakalyani Consultancy Services (NCS) Limited | Information & communication | 2009 |
| NW Healthcare Limited | Health & social care | 2014 |
| Octagon Lettings Limited | Real estate | 2004 |
| Old School Court (Management) Limited | Households | 1986 |
| One MAN One ROD Ltd | Wholesale & retail | 2024 |
| Ortive Invest Ltd | Information & communication | 2015 |
| P&D Electrification Ltd | Extraterritorial | 1962 |
| P.Lowery & Sons Limited | Extraterritorial | 1998 |
| PAT Walsh Limited | Manufacturing | 2013 |
| Pathways Academy Ltd | Education | 2025 |
| Peak Digital Systems Ltd | Professional & scientific | 2025 |
| Penton Limited | Information & communication | 2011 |
| Percy Chapman and SON Limited | Wholesale & retail | 2002 |
| Perfect 2 Ltd | Information & communication | 2008 |
| Peronita Limited | Extraterritorial | 2003 |
| Pharma Plus Supplies Ltd | Wholesale & retail | 2010 |
| Pinewood Mews (One) Management Company Limited | Households | 1992 |
| Prime CUT Joinery Ltd | Construction | 2019 |
| Priory CC49 Limited | Construction | 2019 |
| Pro-Rig Marine Ltd | Manufacturing | 2007 |
| Procar International (Holdings) Limited | Financial services | 2015 |
| Qobat Limited | Professional & scientific | 2010 |
| Quakefire Ltd | Information & communication | 2020 |
| Quick International Couriers (UK) Limited | Transport & logistics | 1983 |
| Quinn Noble Solicitors Ltd | Professional & scientific | 2016 |
| R & S Soni Property LLP | | 2023 |
| R&A Pressure Washing Services Limited | Administrative & support | 2006 |
| R.V.Garlick & SON Limited | Wholesale & retail | 1961 |
| Rainbow Brick Ltd | Real estate | 2018 |
| Raliyos Ltd | Professional & scientific | 2018 |
| Rayburn International Limited | | 1979 |
| Reeds Central Limited | Transport & logistics | 1973 |
| Reliable Textiles Ltd | Wholesale & retail | 2024 |
| RG10 Investments Limited | Real estate | 2020 |
| RGL Promotions Ltd | Manufacturing | 2025 |
| Rhythm of Bliss Limited | Wholesale & retail | 2024 |
| Richardson A&P Solutions Limited | Administrative & support | 2026 |
| Richardson Envelope Limited | Construction | 2022 |
| Richardson Facades Limited | Administrative & support | 2002 |
| Richardson Projects Ltd | Construction | 2024 |
| Richardson Roofing (International) Limited | Construction | 1993 |
| Richardson Roofing Company Limited | Construction | 1980 |