| Michael Kilbey Associates Limited | Real estate | 2012 |
| Micro & Optoelectronic Services Limited | Manufacturing | 1987 |
| Molinaro's Bars & Restaurants Ltd | Hospitality | 2015 |
| Morgan Land Sea and Air LLP | | 2009 |
| Motet Productions Ltd | Information & communication | 2021 |
| Music Productions Ltd | Arts & recreation | 2007 |
| Ncsh Ltd | Wholesale & retail | 2026 |
| ND Trading Ltd | Wholesale & retail | 2005 |
| Neha Galoria Hairdressing Ltd | Other services | 2026 |
| Netcom (U.K.) Limited | Information & communication | 1990 |
| Neural Network Limited | Professional & scientific | 1988 |
| Niche N Agile (UK) Ltd | Information & communication | 2008 |
| Nightingford Properties Limited | Households | 1984 |
| NJ Topham Properties Limited | Real estate | 2019 |
| NL Construction & Refurbishments Ltd | Construction | 2025 |
| NMS Management Solutions Ltd | Information & communication | 2020 |
| Noodlebaker Ltd | Information & communication | 2013 |
| Northfleetsa Limited | Real estate | 2026 |
| Notlob Limited | Financial services | 2013 |
| Noventra Limited | Professional & scientific | 2025 |
| Number-E Ltd | Real estate | 2020 |
| O G Rigging & Services Ltd | Construction | 2021 |
| Oakridge Road Limited | Financial services | 2023 |
| Oberoi Properties UK Limited | Real estate | 2018 |
| Olive & Ivory Play Co. Ltd | Information & communication | 2026 |
| One GE Healthcare UK | Professional & scientific | 2010 |
| Opulen Asset Management Ltd | Real estate | 2005 |
| Orida Corporation Ltd | Hospitality | 2010 |
| Ornate Plastercraft Ltd | Construction | 2025 |
| Otech Services Limited | Manufacturing | 2016 |
| Overstory Partners Ltd | Information & communication | 2025 |
| Owen Gardner Recruitment Ltd | Administrative & support | 2024 |
| Palawan Investments | Financial services | 2016 |
| Paradigm Shift Solutions Limited | Information & communication | 2006 |
| Partgeek Ltd | Wholesale & retail | 2021 |
| Peak Sports Services Ltd | Other services | 2026 |
| Pelglow Limited | Extraterritorial | 1973 |
| Pensity Ltd | Professional & scientific | 2021 |
| Pentire Designs Limited | Professional & scientific | 2013 |
| Perfection Detailing Limited | Professional & scientific | 2008 |
| Perryfield Estates Limited | Real estate | 2016 |
| Peter Mckinstry Limited | Arts & recreation | 2010 |
| Peter Scott & Co LLP | | 2017 |
| Peter Scott Estate Agents Limited | Real estate | 2020 |
| PGT Consultancy Limited | Administrative & support | 2017 |
| Pilates Pointe Limited | Arts & recreation | 2010 |
| Pilates Pointe Teacher Training Limited | Professional & scientific | 2014 |
| Pitchex Limited | Extraterritorial | 2024 |
| Pixelist Productions Ltd | Information & communication | 2026 |
| PJF Groundworks Limited | Construction | 2018 |
| Ploytile Limited | Households | 1990 |
| Pmac Electrics Limited | Construction | 2016 |
| POD Haulage Limited | Transport & logistics | 2012 |
| POD Haulage Transport Ltd | Transport & logistics | 2026 |
| Polar Accounting Solutions Ltd | Professional & scientific | 2018 |
| Pollard Consulting Limited | Professional & scientific | 2019 |
| Potluck Pictures Limited | Information & communication | 2025 |
| Power Team Electrics Ltd | Construction | 2025 |
| Powered Ltd | Construction | 2016 |
| Praba Residencial Letings Ltd | Real estate | 2022 |
| Prestige Wealth Creators Ltd | Real estate | 2011 |
| Prime Route Consulting Limited | Professional & scientific | 2025 |
| Pro Fuel Ltd | Wholesale & retail | 2026 |
| Procurement Effectiveness Limited | Professional & scientific | 2013 |
| Prolifitz Mechanical Ltd | Administrative & support | 2016 |
| Property by Wells Ltd | Households | 2022 |
| PT Electrical Ltd | Construction | 2025 |
| PTF Travel Ltd | Administrative & support | 2023 |
| Quest Activities Limited | Information & communication | 2025 |
| Questa Travel Ltd | Administrative & support | 2006 |
| Quiet Coyote Wellness Ltd | Health & social care | 2023 |
| Qwerkey Ltd | Education | 2025 |
| R Squared Developments Limited | Administrative & support | 2010 |
| Radlett Estates Limited | Real estate | 2017 |
| RAM (Bucks) Ltd | Professional & scientific | 2016 |
| Ramsay Ross Ltd | Wholesale & retail | 2019 |
| Raymond Rice (Developments) Limited | Real estate | 1978 |
| Realty Assets Limited | Real estate | 2017 |
| Redwood Haven Ltd | Construction | 2026 |
| Redwrasse Limited | Information & communication | 2015 |
| Regeneration Properties Limited | Real estate | 2015 |
| Relyt Productions Limited | Information & communication | 2019 |
| Res-Com Fire Engineering Limited | Construction | 2008 |
| RGS Photography Limited | Professional & scientific | 2004 |
| Rhythmrun Ltd | Information & communication | 2025 |
| Riashi Limited | Real estate | 2017 |
| Rickmansworth Lane (Chalfont ST Peter) Management Company Limited | Extraterritorial | 2014 |
| Ride 45 Ltd | Arts & recreation | 2016 |
| RLM Engineering Limited | Information & communication | 2019 |
| Roar Fitness CSG Ltd | Other services | 2023 |
| Robhal Limited | Professional & scientific | 2023 |
| ROE Electrical Limited | Construction | 2023 |
| Ronin Advisory Services Ltd. | Professional & scientific | 2013 |
| RUSH3 Limited | Administrative & support | 2024 |
| Rustique Home Ltd | Wholesale & retail | 2019 |
| S2 Tax & Accountancy Ltd | Professional & scientific | 2024 |
| S2 Tax and Accounting Limited | Professional & scientific | 2017 |
| Saat Enterprise Limited | Hospitality | 2022 |
| Saber Ltd | Real estate | 2020 |
| Salter & Parfitt Limited | Real estate | 1942 |