| Pinka Limited | Arts & recreation | 2008 |
| Pinksalt Partners DW Ltd | Financial services | 2021 |
| Pinner Air Conditioning Limited | Energy | 2007 |
| Pinner Limited | Other services | 1972 |
| Pinner Park Farms Limited | Agriculture & fishing | 1991 |
| Pinner Transport Services Limited | | 1986 |
| Pioneer Information Solutions Ltd | Information & communication | 2006 |
| Pioneer Steel Limited | Professional & scientific | 2004 |
| Pipal BOT Ltd | Hospitality | 2025 |
| Pivotal Post Limited | Information & communication | 2006 |
| PJP Clinical Ltd | Health & social care | 2014 |
| Planer Associates Limited | Professional & scientific | 1953 |
| Planet Choice Ltd | Professional & scientific | 2006 |
| Playtake Limited | Real estate | 1985 |
| Pleasure Parks Limited | Hospitality | 1964 |
| Plumbers Hub Limited | Wholesale & retail | 2024 |
| Plus One Consultants Ltd | Professional & scientific | 1998 |
| Plush Limited | Other services | 1996 |
| Plyvale Limited | Real estate | 1985 |
| Pnrs Right Property Ltd | Real estate | 2013 |
| PNS Enterprise Limited | Wholesale & retail | 2026 |
| Podab UK Limited | Manufacturing | 2020 |
| Podiatry First Ltd | Health & social care | 2005 |
| Pokhara Kitchen Ltd | Hospitality | 2026 |
| Pokit Limited | Wholesale & retail | 2000 |
| Polity Communications Limited | Professional & scientific | 2004 |
| Polmar (UK) Limited | Hospitality | 2005 |
| Polpitiya & Company Limited | Professional & scientific | 2003 |
| Polytechnic Printers Limited | | 1960 |
| Pooka Creatives Ltd | Arts & recreation | 2015 |
| Portland Care Services Limited | Health & social care | 1992 |
| Portland Crescent Management Company Limited | Households | 1986 |
| Portland Motors (London) Limited | Manufacturing | 1988 |
| Positive Moves Consulting (UK) Limited | Professional & scientific | 2007 |
| Powell's Creamery Ltd | Wholesale & retail | 2020 |
| Powermax Electrical Contractor Ltd | Construction | 2017 |
| Powersky Limited | Manufacturing | 1949 |
| PPS Group Ltd | Wholesale & retail | 2018 |
| PPT Engineering Group Limited | Wholesale & retail | 2022 |
| PPT Petroleum Products Technologies Limited | Wholesale & retail | 2022 |
| Practical Implantology Academy Limited | Education | 2018 |
| Pradipan Ltd | Health & social care | 2019 |
| Praise Consult Services Limited | Real estate | 2017 |
| Pramod Rajani Organisation Limited | Wholesale & retail | 2002 |
| Prashanthi Ltd | Health & social care | 2010 |
| Preedy Aircraft Lease Management Ltd | Transport & logistics | 2008 |
| Preentree Limited | Wholesale & retail | 1981 |
| Prem Contractors Limited | Construction | 2005 |
| Premier Consortium Ltd | Professional & scientific | 2003 |
| Premier Limited | Financial services | 1988 |
| Premier Service Zone Limited | Other services | 2019 |
| Premiere Property Solutions Limited | Real estate | 2013 |
| Prestige Bathrooms Limited | Wholesale & retail | 1999 |
| Prestigious Financial Solutions Limited | Financial services | 2007 |
| Prestigious Investments Limited | Extraterritorial | 2001 |
| Prestolite Electric Limited | Manufacturing | 1974 |
| Preston House Ltd | Hospitality | 2016 |
| Prgb Management Ltd | Professional & scientific | 2020 |
| Pride Business Services Limited | Construction | 2002 |
| Pridell Care Limited | Health & social care | 2002 |
| Primcastle Limited | Real estate | 2000 |
| Prime Accountants Ltd | Professional & scientific | 2006 |
| Prime Hill Limited | Real estate | 2003 |
| Prime Interiors Design Ltd Partnership | | 2000 |
| Prime POT Limited | Real estate | 2003 |
| Prime Soul Media Ltd | Professional & scientific | 2026 |
| Primeware Ceramics Limited | Administrative & support | 1996 |
| Printcrafts (Wembley) Limited | Manufacturing | 1990 |
| Printing Press Maintenance Limited | Real estate | 2007 |
| Prior Road Spalding Ltd | Real estate | 2020 |
| Priory Optical Limited | Health & social care | 1999 |
| Pristine DRY Cleaners Limited | Other services | 2005 |
| Privium Limited | Professional & scientific | 2001 |
| Pro Drive (Harrow) Limited | Education | 2007 |
| Pro Optical Ltd | Health & social care | 2005 |
| Pro UK International Ltd | Wholesale & retail | 2018 |
| Pro Unic Ltd | Construction | 2016 |
| Pro-Sport Management Limited | Arts & recreation | 1988 |
| Procare Cleaning Management (South East) Limited | Administrative & support | 2009 |
| Proctor Tech Limited | Information & communication | 2010 |
| Professional Book-Keeping Solutions Ltd. | Professional & scientific | 2003 |
| Proguard Accountants Ltd | Professional & scientific | 2024 |
| Prohire LP | | 2002 |
| Prominent Creative Limited | Arts & recreation | 2021 |
| Prominent Digital Limited | Professional & scientific | 2002 |
| Prominent Financial Services Limited | Financial services | 1995 |
| Proper Gander Productions Ltd | Information & communication | 2014 |
| Property Consults Ltd | Real estate | 2002 |
| Property Development Consultancy Ltd | Professional & scientific | 2021 |
| Property Portfolio (MK) Limited | Real estate | 2003 |
| Property Prints Limited | Other services | 2020 |
| Propertybox Limited | Real estate | 2003 |
| PRP Rescue Services Limited | Manufacturing | 1986 |
| Prss Limited | Wholesale & retail | 2002 |
| Prudent Growth Limited | Extraterritorial | 2000 |
| PS Sall Limited | Health & social care | 2007 |
| Pssk Computing and Analysis Limited | Professional & scientific | 1991 |
| Psynthetics Ltd | Information & communication | 2025 |
| Ptak Building Projects Limited | Construction | 2006 |
| PUB Grub Limited | Hospitality | 2017 |