| Portcullis Electric Gates Limited | Administrative & support | 2009 |
| Porthilly Management Ltd | Hospitality | 2022 |
| Portico Consulting Ltd | Information & communication | 2000 |
| Portico Living Limited | Construction | 2023 |
| Portland Stone Steps Limited | Construction | 2015 |
| Porton Management Limited | Households | 2001 |
| Portugal Paradise Limited | Real estate | 2004 |
| Portway Akeman Limited | Professional & scientific | 2019 |
| Position Systems Limited | Information & communication | 1990 |
| Positive Support Services Limited | Administrative & support | 2018 |
| POST19 Limited | Administrative & support | 2011 |
| Posterum Valorem Ltd | Professional & scientific | 2024 |
| Postpersonalise Limited | Information & communication | 2017 |
| Pottery Court Residents Management Limited | Households | 1987 |
| Poundfield Court Residents Limited | Households | 2001 |
| Power Division (UK) Limited | Real estate | 2020 |
| Power Paving Limited | Administrative & support | 2019 |
| Powerful Productions Ltd | Information & communication | 2024 |
| PR Physio Ltd | Other services | 2025 |
| Practical Data Solutions Limited | Information & communication | 2016 |
| Praills Limited | Health & social care | 1998 |
| Praize Unplugged Limited | Administrative & support | 2016 |
| Praxir Limited | Information & communication | 2026 |
| Precision Appointments Limited | Professional & scientific | 2019 |
| Precision Golf Limited | Wholesale & retail | 2004 |
| Preecha Limited | Hospitality | 2022 |
| Preferred Travel Solutions Limited | Administrative & support | 2005 |
| Premier Capital Estates Limited | Real estate | 2025 |
| Premier Estates Investments Limited | Professional & scientific | 2019 |
| Premier Solutions Limited | Extraterritorial | 2011 |
| Premium Property Partnership Ltd | Real estate | 2018 |
| Pressly Consulting Ltd | Professional & scientific | 2023 |
| Preston Accountancy Services (UK) Limited | Professional & scientific | 2011 |
| Pretty Weird Laboratories Limited | Professional & scientific | 2013 |
| Previouslyon Ltd | Information & communication | 2026 |
| Pride Plastering & Decorating Limited | Construction | 2015 |
| Primavera Partners Limited | Professional & scientific | 2017 |
| Prime Developments London Limited | Construction | 2016 |
| Prime Pulse Performance Ltd | Education | 2024 |
| Prime View Freehold Limited | Households | 2018 |
| Princpl Limited | Professional & scientific | 2018 |
| Print Strategy Ltd | Other services | 2005 |
| Priory Real Estate Ltd | Real estate | 2019 |
| Private Client Systems Limited | Professional & scientific | 2017 |
| Private Music Lessons Ltd | Education | 2021 |
| Pro Advertising Limited | Wholesale & retail | 2012 |
| Pro Aigency Ltd | Information & communication | 2025 |
| Pro Driving School Ltd | Education | 2025 |
| Pro Event Management Limited | Administrative & support | 2002 |
| Pro Finish Property Care Limited | Administrative & support | 2025 |
| Pro-Performance Learning & Development Limited | Professional & scientific | 2002 |
| Probeck Limited | Administrative & support | 2011 |
| Process Specialists Limited | Administrative & support | 2018 |
| Processgods Ltd | Professional & scientific | 2016 |
| Produce Matters Limited | Wholesale & retail | 2019 |
| Production Digital Ltd | Information & communication | 2019 |
| Production Logic Limited | Administrative & support | 2015 |
| Professional Beauty and Aesthetics Ltd. | Other services | 2018 |
| Professional Construction Recruitment Limited | Administrative & support | 2002 |
| Professional Courier Systems Limited | Transport & logistics | 2000 |
| Professional Plumbing Limited | Construction | 2003 |
| Profexecserv Ltd | Professional & scientific | 2024 |
| Profiles Personnel (Farnham) Limited | Hospitality | 2001 |
| Profit POD Ltd | Professional & scientific | 2014 |
| Profix Roofcare Limited | Administrative & support | 2015 |
| Progressive Power Systems Limited | Construction | 2021 |
| Proj-X Planning & Design Services Limited | Information & communication | 1991 |
| Promech Heating Services Ltd | Construction | 2016 |
| Promenade Limited | Arts & recreation | 2014 |
| Promotions Exhibitions Limited | Administrative & support | 2007 |
| Propaganda Creative Limited | Wholesale & retail | 2009 |
| Propellant Datum Limited | Information & communication | 2026 |
| Propellant.Digital Limited | Information & communication | 2025 |
| Propeller Business Development Limited | Professional & scientific | 2004 |
| Propeller Group Limited | Professional & scientific | 2000 |
| Propeller Marketing Group Limited | Professional & scientific | 2023 |
| Propeller PR and Content Ltd | Professional & scientific | 2019 |
| Property Addressed Limited | Real estate | 2016 |
| Property Sales & Lettings Ltd | Real estate | 2013 |
| Propertybell Limited | Real estate | 2017 |
| Proseniors Care Ltd | Health & social care | 2023 |
| Prosource Global Search Ltd | Administrative & support | 2019 |
| Prospela Group Ltd | Information & communication | 2017 |
| Protean Electric Limited | Professional & scientific | 2008 |
| Protect and Prepare Limited | Administrative & support | 2016 |
| Provensis Limited | Health & social care | 1999 |
| Pryor Wood Developments Ltd | Information & communication | 2012 |
| PS Pegasus Ltd | Information & communication | 2024 |
| PSE Strategic Consultants Ltd. | Professional & scientific | 2014 |
| PSO Travel UK Ltd | Administrative & support | 2015 |
| Psychology at the Chestnuts Ltd | Health & social care | 2022 |
| Psynaptics Limited | Administrative & support | 2009 |
| PTH Trading Ltd. | Wholesale & retail | 2009 |
| PTL Golf Ltd | Arts & recreation | 2020 |
| Public Private Partnership Group Limited | Professional & scientific | 1995 |
| Puffin Property Ltd | Real estate | 2020 |
| Puissant Consulting Limited | Information & communication | 2023 |
| Pullen Electrical Services Ltd | Construction | 2021 |
| Pulse Drinks Ltd | Manufacturing | 2026 |
| Pump Services Berkshire Ltd | Extraterritorial | 2019 |