| Pearce&Stone Limited | Real estate | 2018 |
| Peel Fold Holdings Limited | Real estate | 1994 |
| Pegasus Court Tilehurst Leaseholders & Freeholders Group Ltd | Other services | 2024 |
| Peninsula (Grosvenor Street) Limited | Extraterritorial | 2003 |
| People Consulting Services Limited | Administrative & support | 2021 |
| Peppard PC Repair Ltd | Information & communication | 2013 |
| Perfectly Baby Limited | Wholesale & retail | 2009 |
| Perfectly Picked Limited | Professional & scientific | 2003 |
| Period Country Properties Limited | Financial services | 2015 |
| Perpetual House Freehold Limited | Real estate | 2012 |
| Perpetual Limited | Financial services | 1973 |
| Perspectiv LLP | | 2003 |
| Peterkin Group Ltd | Extraterritorial | 2002 |
| Peterkin UK Ltd | Extraterritorial | 1956 |
| Petford Developments Ltd | Real estate | 2024 |
| Pets Place (Worcester Park) Limited | Wholesale & retail | 2010 |
| Phenix Brickwork Services Ltd | Construction | 2008 |
| Phian Ltd | Professional & scientific | 2018 |
| Philip Booth ESQ Limited | Real estate | 2014 |
| Phlech Limited | Information & communication | 2012 |
| Phoenix Property Management Thames Valley Ltd | Construction | 2019 |
| Phytacol Limited | Manufacturing | 2009 |
| Pilkington Consultancy Services Ltd | Information & communication | 2018 |
| Piscera Consulting Limited | Professional & scientific | 2019 |
| Pitch Build Ltd | Construction | 2023 |
| Pitss UK Limited | Information & communication | 2015 |
| Pj&Cr Salt Holdings Limited | Financial services | 2019 |
| PKM Capital Limited | Administrative & support | 2026 |
| PLF Consulting Limited | Mining & quarrying | 2002 |
| Plot 298 SH Tifoni Limited | Real estate | 2025 |
| Plot 310 SH Tifoni Limited | Real estate | 2025 |
| PMG Capital Limited | Administrative & support | 1993 |
| PML Locksmiths Limited | Administrative & support | 2023 |
| Podpillow Ltd | Wholesale & retail | 2026 |
| Polo Complete Limited | Professional & scientific | 2014 |
| Pontin & Co Limited | Hospitality | 2017 |
| Popshots Studios Limited | Wholesale & retail | 2011 |
| Popstore Commercial Limited | Professional & scientific | 2012 |
| Portablemotioncontrol Ltd | Information & communication | 2015 |
| Portal Studio Limited | Administrative & support | 2019 |
| Porter & SON Limited | Construction | 2013 |
| Portsmouth Exhaust & Tyre Services Ltd | Wholesale & retail | 1999 |
| Portway (Management) Company Limited | Households | 1986 |
| POW House Limited | Other services | 1995 |
| Power Flush Pros Ltd | Construction | 2019 |
| Pownall Bentley Ltd | Professional & scientific | 2022 |
| Practicus Limited | Professional & scientific | 2004 |
| Prairie House Publishing Ltd | Information & communication | 2025 |
| Prana Life Ltd | Extraterritorial | 2014 |
| PRB Research Limited | Information & communication | 2018 |
| Predator Power Limited | Wholesale & retail | 2010 |
| Premier Bartleet Limited | Real estate | 1998 |
| Premier Personal Care Limited | Health & social care | 2000 |
| Pretium Consultants Ltd | Professional & scientific | 2009 |
| Prime Property Maintenance (Henley) Ltd | Construction | 2021 |
| Primetime Retirement Solutions Limited | Financial services | 2011 |
| Primordialgreen Ltd | Information & communication | 2026 |
| Priors LEA (East Hanney) Management Company Ltd | Households | 2019 |
| Priory Court (Oxford) RTM Company Limited | Households | 2010 |
| Prisma Energy Storage Ltd | Professional & scientific | 2018 |
| Pristine Condition Holdings Limited | Financial services | 2021 |
| Pristine Condition International Ltd | Education | 1997 |
| Probably Profitable Ventures Ltd | Financial services | 2026 |
| Product LED Scaling Ltd | Professional & scientific | 2023 |
| Production Plan Limited | Administrative & support | 2017 |
| Profit With Purpose Ltd | Professional & scientific | 2015 |
| Project 29 Limited | Construction | 2005 |
| Project Yamaha Bidco Limited | Financial services | 2026 |
| PROJECT404 Limited | Professional & scientific | 2025 |
| Prospecting for Gold Limited | Professional & scientific | 1999 |
| Prosper Mental Health Fund | Health & social care | 2004 |
| Providence FX Limited | Administrative & support | 2024 |
| Przemyslaw Janowicz Ltd | Transport & logistics | 2017 |
| Psychology of Success Ltd | Wholesale & retail | 2022 |
| Pullman Rail Private Hire Ltd | Professional & scientific | 2005 |
| Pulse Currency Limited | Administrative & support | 2025 |
| Pure Boating Ltd | Arts & recreation | 2018 |
| Puretraq Ltd | Manufacturing | 2023 |
| Purifry (GB) Limited | Hospitality | 2008 |
| Puritan Ltd | Manufacturing | 2018 |
| Putman Place Management Company Limited | Households | 1988 |
| Pwaw Investments Limited | Financial services | 2016 |
| PYR Products Ltd | Wholesale & retail | 2021 |
| Pyrosafe Ltd | Manufacturing | 2017 |
| Pzazz Ltd | Real estate | 2021 |
| Q Learning Limited | Professional & scientific | 1997 |
| Qstake Ltd | Professional & scientific | 2026 |
| Quadrangle Management Limited | Households | 1981 |
| Qualis Scriptum Ltd | Professional & scientific | 2022 |
| Quantico Leadership Limited | Professional & scientific | 2021 |
| Quantum Fencing Ltd | Construction | 2018 |
| Queens Street Mews Management Limited | Households | 2003 |
| Queensway Limited | Professional & scientific | 2017 |
| Quietlayer Ltd | Information & communication | 2025 |
| Quintessa Limited | Information & communication | 1999 |
| Quintessa Trustee Limited | Extraterritorial | 2011 |
| Qvest Media Limited | Construction | 2017 |
| R Guide Limited | Administrative & support | 2016 |
| R Smith Media Limited | Information & communication | 2014 |
| R&F Homes (Henley) LLP | | 2022 |