| Porto Holdings Limited | Financial services | 2023 |
| Portsun Limited | Financial services | 2012 |
| Porvar Limited | Water & waste | 2019 |
| Positive Print Group Ltd | Manufacturing | 2019 |
| Post House Dental Limited | Health & social care | 2021 |
| Pound Save London Ltd | Wholesale & retail | 2020 |
| Power Quote Limited | Other services | 2020 |
| Powercor Electrical Services Ltd. | Construction | 2014 |
| Powercor Ltd. | Construction | 2002 |
| Powercor Maintenance Ltd | Construction | 2022 |
| Powwow Events Limited | Other services | 1998 |
| Pr&C Consulting Limited | Professional & scientific | 2022 |
| Praeduco Ltd | Professional & scientific | 2024 |
| Prax Derivatives Limited | Extraterritorial | 2018 |
| Prax Fuels Limited | Extraterritorial | 2017 |
| Prax OIL Limited | Wholesale & retail | 2017 |
| Prax Retail Holdings Limited | Extraterritorial | 2019 |
| Predict IT Ltd | Information & communication | 2003 |
| Preformations Group Limited | Professional & scientific | 1936 |
| Prelude to Business Limited | Administrative & support | 2001 |
| Premi-Air Air Conditioning & Technical Services Limited | Construction | 2020 |
| Premium Airconditioning Ltd | Energy | 2025 |
| Premium Coaches Limited | Transport & logistics | 2005 |
| Premium Sites Ltd | Construction | 2025 |
| Premium Title Media Ltd | Information & communication | 2007 |
| Premium Tours Limited | Transport & logistics | 2002 |
| Premium Transport Limited | Transport & logistics | 2010 |
| Premiumview Property Management Limited | Real estate | 1994 |
| Prep Skincare Products Limited | Manufacturing | 2012 |
| Presidium Consulting Ltd | Administrative & support | 2023 |
| Presscription Juices Ltd | Hospitality | 2014 |
| Prestige Property Developments Surrey Limited | Real estate | 2017 |
| Preston Park Developments Limited | Construction | 2020 |
| Price Right Software Ltd | Information & communication | 2022 |
| Pride of Place Limited | Professional & scientific | 2016 |
| Primary Heating Limited | Construction | 2022 |
| Prime Construction Management (PCM) Ltd | Professional & scientific | 2019 |
| Prime London & Counties Limited | Construction | 2017 |
| Prime Nails Ltd | Other services | 2026 |
| Primet Staffing Limited | Information & communication | 2026 |
| Primeway Properties Limited | Financial services | 1990 |
| Primrose Property (London) Limited | Real estate | 2024 |
| Primrose Road Residents Association Limited | Households | 1997 |
| Principal Property Management Limited | Real estate | 2020 |
| Printgood Limited | Manufacturing | 1995 |
| Priority Appointments Limited | Administrative & support | 2014 |
| Pro AM Padel Events Ltd | Arts & recreation | 2023 |
| Pro Padel Courts Limited | Manufacturing | 2019 |
| Pro Padel Forest Mere Ltd | Arts & recreation | 2025 |
| Pro-Source IT Distribution Ltd | Wholesale & retail | 2024 |
| Probate Law Ltd | Professional & scientific | 2021 |
| Process Safety and Risk Ltd | Professional & scientific | 2025 |
| Prochanges Motor Ltd | Wholesale & retail | 2024 |
| Procter & Gamble (Health & Beauty Care) Limited | Professional & scientific | 1947 |
| Procter & Gamble (L & CP) Limited | Financial services | 1996 |
| Procter & Gamble Finance Holding Limited | Professional & scientific | 2015 |
| Procter & Gamble Financial Investments LLP | | 2015 |
| Procter & Gamble Financial Services Limited | Professional & scientific | 2015 |
| Procter & Gamble Health Limited | Professional & scientific | 1979 |
| Procter & Gamble Limited | Professional & scientific | 1905 |
| Procter & Gamble Product Supply (U.K.) Limited | Manufacturing | 1995 |
| Procter & Gamble Sports and Social Club Limited | Administrative & support | 2004 |
| Procter & Gamble Technical Centres Limited | Professional & scientific | 1996 |
| Procter & Gamble UK Group Holdings Limited | Transport & logistics | 1994 |
| Procter Cleaning & Hygiene Supplies Limited | Administrative & support | 2007 |
| Procter Holdings Limited | Other services | 1999 |
| Products for Progress Ltd | Wholesale & retail | 2026 |
| Professional Roofing Specialists Ltd | Construction | 2025 |
| Project Fleet Newco Limited | Financial services | 2020 |
| Promptomate AI Ltd | Professional & scientific | 2025 |
| Pronet Global Ltd | Administrative & support | 2002 |
| Pronto Drive Through Limited | Hospitality | 2021 |
| Prop ME UP Limited | Information & communication | 2013 |
| Properitum Associates Ltd | Professional & scientific | 2024 |
| Property Inspired Wealth Limited | Real estate | 2024 |
| Property Personnel Limited | Administrative & support | 1988 |
| Property Register Limited | Extraterritorial | 2021 |
| Property&Rentals Limited | Real estate | 2023 |
| Propertypro Commercial Ltd | Administrative & support | 2026 |
| Propertypro Residential Ltd | Households | 2026 |
| Prospect Court Yard Management Company Limited | Households | 2012 |
| Prosperous ERA Ltd | Education | 2018 |
| Prostrip Demolition Limited | Construction | 2008 |
| Proventus Renewables Ltd | Professional & scientific | 2018 |
| Prowest Consulting Ltd | Financial services | 2018 |
| PS Foundation | Education | 2008 |
| PSC1 Holdings Ltd | Financial services | 2025 |
| PSR Project Management Limited | Other services | 2022 |
| PSS Power Connections Limited | Energy | 2026 |
| PSS Power Engineering Ltd | Other services | 2011 |
| Psychology First Consultants Limited | Education | 2018 |
| PUA Films Limited | Information & communication | 2017 |
| Puffin Ventures Limited | Information & communication | 2019 |
| Pulse Innovations Ltd. | Information & communication | 2007 |
| Punjabi Roti UK Ltd | Hospitality | 2025 |
| Purbrook Way Limited | Construction | 2025 |
| Pure Choice Limited | Water & waste | 2000 |
| Pure Cinema Ltd | Arts & recreation | 2025 |
| Pure Genetic Medical Limited | Administrative & support | 2014 |
| Pure Waste Management Ltd | Water & waste | 2024 |