| Pixelboom Limited | Information & communication | 2005 |
| Pixelgeek Consulting Ltd | Information & communication | 2018 |
| Pizzaiolo Wheels Ltd | Hospitality | 2024 |
| PJM Carpentry Ltd | Construction | 2025 |
| PJR Personal Licence Services Limited | Hospitality | 2024 |
| Pjsa Limited | Professional & scientific | 2007 |
| PK Equestrian Limited | Agriculture & fishing | 2022 |
| PK Ponies Limited | Agriculture & fishing | 2022 |
| PKL Procurement Ltd | Other services | 2017 |
| PL PHC Limited | Financial services | 2025 |
| Place Finder Limited | Real estate | 2018 |
| Plan Target Limited | Professional & scientific | 2005 |
| Planet Nails Maidenhead Ltd | Other services | 2017 |
| Planet Victuals Limited | Wholesale & retail | 2015 |
| Planworks+ Limited | Professional & scientific | 2025 |
| Plastor Group Limited | Wholesale & retail | 2021 |
| Plastor Limited | Wholesale & retail | 2002 |
| Plates 2 Go Ltd | Wholesale & retail | 2026 |
| Play and Learn Together Limited | Extraterritorial | 2014 |
| Playful Retail Ltd | Wholesale & retail | 2025 |
| Playinthevortex Ltd | Real estate | 2020 |
| PLD Limited | Construction | 2013 |
| PLD Worldwide Limited | Financial services | 2025 |
| Pleiades Productions Ltd | Arts & recreation | 2020 |
| PLM Vcapital Investments LLP | | 2016 |
| PLP Hospitality Ltd | Professional & scientific | 2026 |
| Plumb Plus Supplies Ltd. | Wholesale & retail | 2010 |
| Plumbers & GAS Engineers Ltd | Construction | 2020 |
| Plutus Dent Ltd | Health & social care | 2016 |
| Plutus Living Ltd | Real estate | 2022 |
| Plutus Pro Properties Limited | Real estate | 2018 |
| Plutus Prodent Holdings Ltd | Financial services | 2016 |
| PMB (Europe) Limited | Arts & recreation | 1998 |
| PMB General Partner Ltd | Construction | 2000 |
| PMB Holdings Limited | Administrative & support | 1992 |
| PMI L2L Systems Ltd | Manufacturing | 2014 |
| PMK Information Services Ltd | Professional & scientific | 2012 |
| PMN Marketing Ltd | Professional & scientific | 1997 |
| PMN Public Relations Limited | Professional & scientific | 1994 |
| PN Pet Services Limited | Other services | 2010 |
| Poached Cafe Ltd | Hospitality | 2026 |
| Pocket Tutor Limited | Education | 2025 |
| Poise Events Ltd | Administrative & support | 2016 |
| Polestar Insights Limited | Professional & scientific | 2017 |
| Policy Foresight Ltd | Education | 2018 |
| Polish'D Limited | Other services | 2015 |
| Pollie Hill Wind Farm Limited | Energy | 2022 |
| Polo Connect UK Limited | Agriculture & fishing | 2025 |
| Poollock Limited | Professional & scientific | 2012 |
| Poolsafe Ltd | Professional & scientific | 2021 |
| Popeyes Barbers Ltd | Other services | 2025 |
| Poplar Close (Bracknell) M.C. Limited | Households | 2008 |
| Portford Associates Limited | Professional & scientific | 2018 |
| Porthpean Consultancy Ltd | Professional & scientific | 2025 |
| Portland Homes Limited | Real estate | 2021 |
| Portland Residences Limited | Households | 2023 |
| Positive Health Innovations Limited | Professional & scientific | 2026 |
| Positive Parenting Project Ltd | Professional & scientific | 2017 |
| Potentiality Consultancy Services Limited | Professional & scientific | 1999 |
| Potter Holdings Limited | Manufacturing | 2015 |
| Poulomi Holdings Ltd | Real estate | 2015 |
| Poulomi Services Ltd | Real estate | 2015 |
| Powell Mcneil Machinery Company Limited | Wholesale & retail | 1973 |
| Power Shift Move Ltd | Transport & logistics | 2026 |
| Powney Food & Wine Ltd | Wholesale & retail | 2019 |
| Powney Local Ltd | Wholesale & retail | 2026 |
| Pptf Fundraising Events Limited | Other services | 2025 |
| PQA Ltd | Arts & recreation | 2007 |
| Prabhuram Palanivel Ltd | Information & communication | 2023 |
| Pradaas Limited | Wholesale & retail | 2024 |
| Pradori Capital Ltd. | Hospitality | 2024 |
| Pradori Ltd | Financial services | 2023 |
| Pragma Marketing Limited | Professional & scientific | 2004 |
| Pramesh Enterprises Ltd | Professional & scientific | 2017 |
| Pranav Consulting Ltd | Information & communication | 2014 |
| Pranav Infotech Ltd | Wholesale & retail | 2016 |
| Pranconic Limited | Extraterritorial | 1981 |
| Pravidha Solutions Limited | Information & communication | 2013 |
| Praxio Ltd | Real estate | 2025 |
| Praxis Associates Ltd | Professional & scientific | 2023 |
| Precious Hands Ltd | Health & social care | 2023 |
| Precision Property Surveyors Ltd | Professional & scientific | 2025 |
| Predictable Marketing Limited | Information & communication | 2017 |
| Predictive Data Analytics Ltd | Information & communication | 2024 |
| Premier Commodity Trading Ltd | Wholesale & retail | 2022 |
| Premier Engineering (EC) Limited | Professional & scientific | 1992 |
| Premier Lambourn Homes LLP | | 2025 |
| Premier Mechanical Installations Limited | Construction | 2003 |
| Premier Pipeline Limited | Wholesale & retail | 1999 |
| Premier Property Managment Company Limited | Real estate | 2012 |
| Premier Utilities International Ltd | Wholesale & retail | 2025 |
| Premiership Cuts Limited | Other services | 2003 |
| Premix Concrete Limited | Professional & scientific | 1954 |
| Prepopp Ltd | Information & communication | 2020 |
| Presien UK Limited | Information & communication | 2021 |
| Pressure Drop Pictures Ltd | Information & communication | 2012 |
| Prestige Cars Berkshire Ltd | Wholesale & retail | 2013 |
| Prestige Dent Solutions Limited | Wholesale & retail | 2010 |
| Prestige Home Care Limited | Health & social care | 2019 |
| Prestige Household Ltd | Administrative & support | 2024 |