| Precision Admin Ltd | Administrative & support | 2025 |
| Precision Consult Limited | Professional & scientific | 2017 |
| Precision Events Limited | Administrative & support | 2010 |
| Precision Home Building Ltd | Construction | 2024 |
| Prehype UK Ltd | Financial services | 2015 |
| Prepro Consult Ltd | Professional & scientific | 2012 |
| President Motors Ltd | Wholesale & retail | 2025 |
| Presidential Cars Limited | Transport & logistics | 1998 |
| Presidential Limited | Administrative & support | 1998 |
| Prestige Chauffeurs of Wokingham Limited | Transport & logistics | 2017 |
| Prestige Fencing & Landscapes Ltd | Administrative & support | 2023 |
| Prestige Reading Ltd | Wholesale & retail | 2026 |
| Pride Impact Services Ltd | Transport & logistics | 2021 |
| Prim Consulting Limited | Information & communication | 2005 |
| Primaxis Ltd | Information & communication | 2011 |
| Prime Accounting and Finance Limited | Professional & scientific | 2023 |
| Prime Estates Private Limited | Real estate | 2025 |
| Prime Motorworks Berkshire Ltd | Professional & scientific | 2025 |
| Prime Office Services Ltd | Professional & scientific | 2015 |
| Prime Performance Management Limited | Professional & scientific | 2024 |
| Primetech Engineers Limited | Construction | 2023 |
| Primrose Property Holdings Ltd | Professional & scientific | 2016 |
| Principal Dwellings Limited | Real estate | 2019 |
| Principal Property Investments Ltd | Real estate | 2021 |
| Principal Property Solutions Ltd | Real estate | 2021 |
| Print Masters (Maidenhead) Ltd | Manufacturing | 2019 |
| Printamax Limited | Manufacturing | 2006 |
| Priority SERVICES4U Ltd | Health & social care | 2019 |
| Priory South IE Management (Northampton) Limited | Real estate | 2020 |
| Prisdan Ltd | Professional & scientific | 2009 |
| Prismlux PVT Ltd | Wholesale & retail | 2024 |
| PRJ Logistics Ltd | Transport & logistics | 2022 |
| Pro FX Ltd | Arts & recreation | 2023 |
| Pro Taekwon-Do LLP | | 2021 |
| Pro-Fisher Boat Sales UK Ltd | Wholesale & retail | 2024 |
| Proac Limited | Professional & scientific | 1988 |
| Proagewell Ltd | Health & social care | 2026 |
| Probert Consulting Limited | Professional & scientific | 2012 |
| Probuild Management Ltd | Professional & scientific | 2019 |
| Procare Medical Supplies LLP | | 2026 |
| Process Point Technologies Corporation UK Ltd | Information & communication | 2024 |
| Procom-Im Ltd | Professional & scientific | 2009 |
| Procter Motor Commercial Body Repairs Ltd | Manufacturing | 2022 |
| Procter Motor Competitions Ltd | Arts & recreation | 2025 |
| Procter Property Group Ltd | Real estate | 2021 |
| Procter Residential Property Group Ltd | Real estate | 2025 |
| Procureit Solutions Ltd | Information & communication | 2013 |
| Procurement International Group Ltd | Wholesale & retail | 2025 |
| Procut Limited | Manufacturing | 1977 |
| Prodec Networks Ltd | Information & communication | 1998 |
| Prodgex Ltd | Professional & scientific | 2023 |
| Production Company 6 Ltd | Information & communication | 2025 |
| Production Consult Ltd | Administrative & support | 2009 |
| Professional Acoustics Limited | Professional & scientific | 1988 |
| Professional Telecom Consultants Limited | Professional & scientific | 2009 |
| Professionals in Partnership Ltd | Professional & scientific | 2016 |
| Progressive Marine and Offshore Solutions Limited | Professional & scientific | 2020 |
| Project Completion Management Services Limited | Construction | 2018 |
| Project Morse Ltd | Information & communication | 2021 |
| Project Video Live Ltd | Information & communication | 2026 |
| Projx Automation Limited | Professional & scientific | 2025 |
| Projx Engineering Limited | Professional & scientific | 2017 |
| Projx Services Limited | Wholesale & retail | 2004 |
| Projx Solutions Limited | Administrative & support | 2014 |
| Prolian Services Ltd | Information & communication | 2011 |
| Promantra Ltd | Wholesale & retail | 2024 |
| Promise Inclusion Limited | Health & social care | 2007 |
| Promod Cars Ltd | Wholesale & retail | 2022 |
| Promopairup Ltd | Professional & scientific | 2025 |
| Propagate Digital Limited | Information & communication | 2024 |
| Propco SL Limited | Health & social care | 2023 |
| Properties Nest Limited | Real estate | 2026 |
| Property Assistant UK Limited | Real estate | 2014 |
| Property by MJ Ltd | Real estate | 2021 |
| Property Cast Limited | Administrative & support | 2026 |
| Property Excellence Limited | Construction | 2009 |
| Property Legacy Investors Club Limited | Real estate | 2018 |
| Property Snagging Limited | Construction | 2017 |
| Property Snagging London Ltd | Construction | 2017 |
| PROPERTYPHOTOS24 Ltd | Professional & scientific | 2023 |
| Proten Sales Development Ltd | Professional & scientific | 2018 |
| Provide Sess Limited | Administrative & support | 2008 |
| PS Advisory Limited | Professional & scientific | 2017 |
| PSG Technologies Ltd | Information & communication | 2013 |
| PSH Consulting Limited | Professional & scientific | 2003 |
| PSM Fire Ltd | Public administration | 2017 |
| PSN Electrical Limited | Construction | 2019 |
| PST Business Solutions Limited | Professional & scientific | 2005 |
| PT U Personal Training Ltd | Arts & recreation | 2013 |
| Ptfolder Ltd | Information & communication | 2011 |
| PTS Developments Wokingham Limited | Wholesale & retail | 2012 |
| Puddle Electrics Ltd | Construction | 2022 |
| Pugdog Consultancy Limited | Professional & scientific | 2011 |
| Puggles Bath and Groom Ltd | Other services | 2016 |
| Pulsar Developments Ltd. | Wholesale & retail | 2018 |
| Pulse (Maidenhead) Management Company Limited | Real estate | 2004 |
| Pulse Cleaning Limited | Administrative & support | 2025 |
| Punarch Technical Services Ltd | Information & communication | 2025 |
| Punchy Drinks Limited | Wholesale & retail | 2017 |
| Pure Bliss Limited | Other services | 2015 |