| Portal Estate Management Ltd | Real estate | 2017 |
| Portland Place (Sherwood Street) Management Company Limited | Households | 2004 |
| Portnall Securities Limited | Real estate | 1973 |
| Portofino Nominees Limited | Information & communication | 2022 |
| Portofino Technologies UK Ltd | Information & communication | 2021 |
| Portsmouth Online Limited | Education | 2016 |
| Posarelli Villas GB Limited | Real estate | 2006 |
| Posco International Trading Co., Ltd | Wholesale & retail | 2025 |
| Poseidon Opportunities Limited | Financial services | 2018 |
| Posh Electrical Ltd | Construction | 2025 |
| Posiceloni Ltd | Manufacturing | 2024 |
| Positive Automation Limited | Administrative & support | 2009 |
| Positive Mood Limited | Wholesale & retail | 2021 |
| Positive Zone Limited | Information & communication | 2021 |
| Pospo - Positive Potential Ltd | Education | 2019 |
| Post Mortem Services Ltd | Professional & scientific | 1997 |
| Postcord Limited | Information & communication | 2023 |
| Posterngate Publishing Limited | Information & communication | 2011 |
| Postjet Systems Limited | Manufacturing | 2006 |
| Postscript Communications Limited | Professional & scientific | 1997 |
| Postulate Ltd | Professional & scientific | 2016 |
| Postureworx Ltd | Health & social care | 2015 |
| Potra Limited | Hospitality | 2023 |
| Pots Limited | Real estate | 2017 |
| Potter & Potter (Building Consultants) Limited | Construction | 2005 |
| Potters Hollow (Bulwell) Management Company Limited | Households | 2005 |
| Pound Management Limited | Households | 2022 |
| Povo Groceries Limited | Wholesale & retail | 2025 |
| Powdermills Prop Co UK Ltd | Financial services | 2024 |
| Powell Baptiste Limited | Professional & scientific | 2024 |
| Power & Rail Solutions Ltd | Construction | 2020 |
| Power 10 People Limited | Other services | 2018 |
| Power BI Storyteller Ltd | Information & communication | 2018 |
| Power Distribution Support Ltd | Construction | 2014 |
| Power H Ltd | Information & communication | 2018 |
| Power Integrations (Europe) Limited | Information & communication | 1991 |
| Power Integrations UK Limited | Manufacturing | 2000 |
| Power Keeper Foundation Ltd | Extraterritorial | 2024 |
| Power Management Design & Build Limited | Professional & scientific | 2014 |
| Power of Numbers Limited | Professional & scientific | 2014 |
| Power Resourcing Ltd | Administrative & support | 2020 |
| Power to Inspire | Education | 2013 |
| Powerdrop Ltd | Extraterritorial | 2012 |
| Powerelab UK Ltd | Information & communication | 2019 |
| Powerithm Labs Ltd | Information & communication | 2026 |
| Powermatrix Limited | Manufacturing | 2024 |
| Powerpro Tools Co., Ltd. | Wholesale & retail | 2023 |
| Powerscourt Services Limited | Real estate | 2007 |
| Powersense Technology Limited | Information & communication | 2022 |
| Powlett & Associates Ltd | Professional & scientific | 2014 |
| Powtech Technology Co., Ltd | Extraterritorial | 2014 |
| Poynters Lodge Management Company Limited | Households | 1987 |
| PPD CT Investments LLP | | 2009 |
| PPD Global Ltd | Professional & scientific | 1981 |
| PPD International Holdings (UK) Ltd. | Financial services | 2019 |
| PPD International Investments Limited | Professional & scientific | 2012 |
| PPD UK Holdings Limited | Financial services | 1996 |
| PQR Investments Ltd | Real estate | 2019 |
| PR Aircraft Maintenance Ltd | Manufacturing | 2020 |
| Practising Turkish Accountants (UK) Ltd | Extraterritorial | 2024 |
| Praedex Limited | Information & communication | 2026 |
| Pragma E-Comm Ltd | Wholesale & retail | 2025 |
| Pragmatic Semiconductor Limited | Manufacturing | 2010 |
| Prana Trade Ltd | Wholesale & retail | 2025 |
| Pratishta Consulting Limited | Professional & scientific | 2012 |
| Praus Ltd | Real estate | 2018 |
| Praxima Global Payroll Solutions Limited | Administrative & support | 2023 |
| Praxis Courses Limited | Education | 2004 |
| Precedence Technologies Ltd | Manufacturing | 1999 |
| Precious Court Management Limited | Real estate | 2007 |
| Precise Prophecy Ltd | Information & communication | 2021 |
| Precision Atomics Ltd | Manufacturing | 2014 |
| Precision Cad-Cam Tech Solutions Ltd | Manufacturing | 2025 |
| Precision Hearing Solutions Limited | Wholesale & retail | 2024 |
| Precision Medicine Tech Solutions Limited | Professional & scientific | 2023 |
| Precision Wellness Ltd | Health & social care | 2025 |
| Precisionmetric Group Co., Ltd | Manufacturing | 2025 |
| Predixus Ltd | Information & communication | 2023 |
| Preim Holdings Limited | Financial services | 2018 |
| Preim Ltd | Administrative & support | 2011 |
| Preloved & Vintage Ltd | Wholesale & retail | 2019 |
| Premier Electrical Design and Installation Ltd | Construction | 2018 |
| Premier GP Limited | Health & social care | 2023 |
| Premier Holidays Limited | Administrative & support | 1984 |
| Premier Investment Management Services Ltd | Financial services | 2012 |
| Premier Laboratory Systems Limited | Manufacturing | 1987 |
| Premier Motor Vehicle Servicing Ltd | Wholesale & retail | 2014 |
| Premier Travel Agency Limited | Administrative & support | 1963 |
| Premiere School of Dance Group Ltd | Arts & recreation | 2020 |
| Premium Appointment Setters Limited | Professional & scientific | 2023 |
| Premium Branding Ltd | Wholesale & retail | 2013 |
| Premium Foods Stores Limited Liability Partnership | | 2020 |
| Premium Lane Limited | Transport & logistics | 2025 |
| Premium Properties Cambridge Ltd | Construction | 2024 |
| Premium Solutions Ltd | Administrative & support | 2017 |
| Premix Marketing and Promotions Ltd. | Professional & scientific | 2013 |
| Premservice Ltd | Construction | 2008 |
| Prepause Limited | Professional & scientific | 2026 |
| Prepped Food Company Limited | Hospitality | 2017 |
| Prereg-Foundation Limited | Extraterritorial | 2023 |