| People Intelligence Partnership Ltd | Professional & scientific | 2008 |
| People People Learning & Development Ltd | Administrative & support | 2023 |
| Peoplecentric Assessments Limited | Extraterritorial | 2021 |
| Percy Lovejoy (Marlow) Limited | Extraterritorial | 1955 |
| Perennia Pictures Ltd | Information & communication | 2026 |
| Perfect Brothers Ltd | Construction | 2022 |
| Perioacademy Limited | Administrative & support | 2021 |
| Periodontal & Implant Connection Ltd | Health & social care | 2018 |
| Pest Stop Limited | Administrative & support | 2023 |
| Peter Crossley Flowers Limited | Wholesale & retail | 2025 |
| Peter Memmott Consulting Limited | Professional & scientific | 2021 |
| Petras Property Ltd | Real estate | 2018 |
| Petrosaenz Limited | Mining & quarrying | 2018 |
| Petticote Layne Ltd | Wholesale & retail | 2022 |
| PGF Finance Limited | Administrative & support | 2017 |
| Pharmaceutical Trade Marks Group | Professional & scientific | 2002 |
| Pharmasure Ltd | Professional & scientific | 2024 |
| Phfd Limited | Professional & scientific | 2001 |
| Phil Bourne Consulting Limited | Professional & scientific | 2014 |
| Philip Marsh Collins Deung Limited | Real estate | 2003 |
| Philip Moody Limited | Professional & scientific | 2006 |
| Phoenix Building Control Services Limited | Professional & scientific | 2001 |
| Phoenix Ortho Limited | Health & social care | 2025 |
| Phoenix Water Technologies Ltd | Water & waste | 2003 |
| Piccadilly Consulting Limited | Professional & scientific | 2021 |
| Pillar Business Partners Ltd | Professional & scientific | 2013 |
| Pillow Talk Limited | Wholesale & retail | 2019 |
| Pillows International Limited | Wholesale & retail | 2019 |
| Pinnacle Fire Protection Ltd | Construction | 2018 |
| Pins Plus Limited | Information & communication | 2021 |
| Pioneer Estates Holdings Limited | Real estate | 2023 |
| Pioneer Estates Ltd | Real estate | 2020 |
| Piper Energy Controls Ltd | Professional & scientific | 2022 |
| Pivotl Limited | Information & communication | 2022 |
| Pixar Property Limited | Real estate | 2014 |
| PJ Adams Haulage Ltd | Transport & logistics | 2018 |
| Place Pubs Ltd | Hospitality | 2025 |
| Plant Rental Corporation Ltd | Administrative & support | 2024 |
| Platin Limited | Wholesale & retail | 1986 |
| Platinum Build Ltd | Construction | 2018 |
| Platterful Ltd | Hospitality | 2021 |
| PLB Europe Ltd | Information & communication | 2018 |
| Plemont Biopharma Consulting Limited | Administrative & support | 2025 |
| Plumb Tomatoes Limited | Construction | 2017 |
| Plumfleet Limited | Professional & scientific | 2017 |
| Poland Restaurants Limited | Hospitality | 2026 |
| Pollbury Investments Limited | Professional & scientific | 1962 |
| Polytunnel Nursery Limited | Agriculture & fishing | 2014 |
| Ponds House Management Company Limited | Real estate | 2007 |
| Portobello Road Distillery Ltd | Manufacturing | 2024 |
| Portside Cutlery Ltd | Manufacturing | 2024 |
| Possum Play Limited | Wholesale & retail | 2022 |
| Posture Essentials Ltd | Wholesale & retail | 2024 |
| Powell and Giles Property Limited | Real estate | 2023 |
| Powell Tolner & Associates Limited | Professional & scientific | 2013 |
| Power Interactive Ltd | Information & communication | 2024 |
| Ppcg Ltd | Administrative & support | 2021 |
| Pragmatix UK Ltd | Education | 2010 |
| Prana-Uk Limited | Real estate | 1998 |
| Praxispro Ltd | Information & communication | 2014 |
| PRB Construction Consulting Services Limited | Construction | 2016 |
| Predicate Limited | Information & communication | 1996 |
| Premium Plumbing and Heating Limited | Construction | 2013 |
| Premium Promotions Limited | Professional & scientific | 1999 |
| Premview Properties Limited | Real estate | 1994 |
| Present Events Ltd | Arts & recreation | 2013 |
| Presenting Success Limited | Administrative & support | 2011 |
| Preservation Craftsmen Limited | Construction | 1976 |
| Prestige Design & Management Limited | Construction | 2012 |
| Preventicum UK Limited | Health & social care | 2004 |
| Pri-Med Global Exhibitions Ltd | Administrative & support | 2018 |
| Priestley Bakers Limited | Hospitality | 2014 |
| Prime Endoscopy (Bristol) Limited | Health & social care | 2009 |
| Prime Properties (Surrey) Limited | Real estate | 2014 |
| Prime Strategy Consultants Limited | Professional & scientific | 1998 |
| Primo (Chiswick) Management Company Limited | Households | 2024 |
| Princeraven Limited | Real estate | 2003 |
| Princes Risborough Golf Club Limited | Arts & recreation | 1976 |
| Princess Grove Seer Green Management Company Limited | Households | 2011 |
| Print Green Ltd | Information & communication | 2024 |
| Priority Electrical LKA Ltd | Construction | 2025 |
| Pritchard Estates and Management Limited | Professional & scientific | 2000 |
| Pritchard Global Developments Limited | Real estate | 2016 |
| Pro Door (UK) Holdings Limited | Financial services | 2024 |
| Pro Door (UK) Limited | Administrative & support | 2001 |
| Process Plant Computing Limited | Information & communication | 1998 |
| Prodigy Learning (UK) Limited | Education | 2017 |
| Prodroneworx Limited | Professional & scientific | 2016 |
| Productivity Barn Ltd. | Administrative & support | 2015 |
| Progress Architecture Limited | Professional & scientific | 2018 |
| Progress Design (HC & LDN) Limited | Professional & scientific | 2023 |
| Progress Planning and Land Consultants Limited | Professional & scientific | 2014 |
| Proheat Systems Limited | Wholesale & retail | 2012 |
| Project Estates Limited | Real estate | 2017 |
| Projnov Trading Ltd | Wholesale & retail | 2026 |
| Promecam Limited | Manufacturing | 2013 |
| Proper Wild Limited | Wholesale & retail | 2020 |
| Properties of Matter Limited | Real estate | 2010 |
| Property Dynamics Consultancy Ltd | Real estate | 2009 |
| Property Imaging Limited | Construction | 2005 |