| Pixus Limited | Professional & scientific | 2000 |
| PJ & C Consultancy Limited | Information & communication | 2008 |
| PJ Analytic Limited | Information & communication | 2022 |
| PJ Pet Products Holdings Limited | Financial services | 2021 |
| PJ Pet Products Limited | Wholesale & retail | 2010 |
| PJA Limited | Professional & scientific | 2003 |
| PJB Wilson Limited | Health & social care | 2011 |
| PJD (Oxford) Limited | Administrative & support | 2009 |
| PJD Construction (Oxford) Limited | Construction | 2009 |
| PJS Installations Limited | Information & communication | 2003 |
| Plain Words Limited | Professional & scientific | 1993 |
| Planes Trains and Automobiles Art Ltd | Wholesale & retail | 2024 |
| Planes Trains and Automobiles Gallery Ltd | Wholesale & retail | 2024 |
| Planet E Bikes Limited | Wholesale & retail | 2020 |
| Planet Interactive Arts Limited | Information & communication | 2000 |
| Planet IT Limited | Information & communication | 2003 |
| Planet Recruitment Services Ltd | Administrative & support | 2019 |
| Plarisan Properties Ltd | Real estate | 2024 |
| Plasma Surgical Limited | Health & social care | 1999 |
| Play Your Position C.I.C. | Education | 2025 |
| Play/Pause Ltd | Information & communication | 2017 |
| Plemont Limited | Wholesale & retail | 2005 |
| Pleroma Property Solutions Ltd | Real estate | 2020 |
| Ploútos Consultants Ltd | Professional & scientific | 2023 |
| Plusflower Properties Ltd | Real estate | 2020 |
| Plymouth Devon International College Ltd | Education | 2009 |
| PMC Global Holdings Limited | Information & communication | 2021 |
| Poleplant Limited | Manufacturing | 2015 |
| Polish Taste (Oxford) Limited | Wholesale & retail | 2007 |
| Polly Pockets Ltd | Other services | 2018 |
| Pond Close Management Ltd | Households | 2025 |
| Pond Farm Management Company Limited | Households | 2015 |
| Ponderosa (Didcot) Limited | Households | 2023 |
| Pony Music Group Limited | Professional & scientific | 2019 |
| Pooley Aviation Limited | Extraterritorial | 2002 |
| Pooley Naval Telescopes Ltd | Manufacturing | 2016 |
| Pooley Sword Limited | Manufacturing | 2005 |
| Pooleys Flight Equipment Limited | Manufacturing | 1971 |
| Pooleys Flight Guide Limited | Professional & scientific | 1993 |
| Poolway Limited | Real estate | 2008 |
| Portaltech Consulting Ltd | Professional & scientific | 2011 |
| Portland Private Office Holdings Limited | Financial services | 2020 |
| Portland Private Office Limited | Real estate | 2017 |
| Postelnicu Property Ltd | Real estate | 2025 |
| PPP Property Management Ltd | Households | 2024 |
| PPR Publicity Limited | Professional & scientific | 2007 |
| Practical Sales Processes Limited | Professional & scientific | 2010 |
| Prancing Properties Ltd | Real estate | 2022 |
| Prancing Property Holdings Ltd | Financial services | 2022 |
| Prancing Property Lets Ltd | Real estate | 2023 |
| Precise Connect Limited | Administrative & support | 2019 |
| Preferred Finance Limited | Administrative & support | 2008 |
| Premier Bikes (Didcot) Ltd | Wholesale & retail | 2013 |
| Premier Bikes Holdings Limited | Financial services | 2022 |
| Premier ICT Limited | Information & communication | 2003 |
| Premier Soccer Centres Limited | Arts & recreation | 2003 |
| Premium Health & Wealth Limited | Wholesale & retail | 2025 |
| Prep 1ST Limited | Construction | 2018 |
| Prep Schools Trust | Education | 1969 |
| Preservica Ltd | Information & communication | 2012 |
| Press Photos Limited | Professional & scientific | 1999 |
| Pretty Tailored UK Limited | Wholesale & retail | 2025 |
| Primary Productions Ltd | Arts & recreation | 2024 |
| Primrose Makes Ltd | Administrative & support | 2025 |
| Principle IT Services Limited | Extraterritorial | 2015 |
| Printers Court Management Company (Abingdon) Limited | Real estate | 2010 |
| Priority 6 Ltd | Arts & recreation | 2013 |
| Proactiv Online Limited | Professional & scientific | 2018 |
| Proactive Prosthetics Limited | Health & social care | 2001 |
| Proarch IT Solutions Limited | Information & communication | 2016 |
| Proark Ltd | Transport & logistics | 2019 |
| Procenergy Ltd | Manufacturing | 2026 |
| Prochn Ltd | Construction | 2021 |
| Professional Medical International Ltd | Education | 2026 |
| Profit Digital Solutions Ltd | Information & communication | 2017 |
| Programmer Ltd | Wholesale & retail | 2025 |
| Project Management Services (Oxford) Ltd | Construction | 2009 |
| Project Marketing Services International Ltd | Wholesale & retail | 2005 |
| Project Saved Ltd | Professional & scientific | 2026 |
| Project Stone Ltd | Extraterritorial | 2014 |
| Project Xpert Ltd | Professional & scientific | 2025 |
| Prolinks Distribution Limited | Wholesale & retail | 2024 |
| Prologic First (UK) Limited | Information & communication | 2009 |
| Proper JOB Properties Limited | Real estate | 2017 |
| Proper Solutions Limited | Information & communication | 2015 |
| Propertcleaning Services Ltd | Administrative & support | 2016 |
| Prostate Care Limited | Health & social care | 2018 |
| Prototech Engineering Limited | Manufacturing | 2011 |
| Provence Racing Ltd | Arts & recreation | 2023 |
| Proventure Limited | Wholesale & retail | 2015 |
| PSB Consulting Engineers (Oxford) Limited | Professional & scientific | 2011 |
| Psde Ltd. | Real estate | 2021 |
| PST Enterprises Limited | Education | 2012 |
| Psybersafe Ltd. | Education | 2019 |
| PTT BIO Limited | Professional & scientific | 2023 |
| Pucci Gang Ltd | Wholesale & retail | 2024 |
| Pumpkin Wholesale Limited | Wholesale & retail | 2000 |
| Punk Rock Factory Limited | Wholesale & retail | 2023 |
| PUR3 Ltd | Wholesale & retail | 2006 |
| Purbeck Construction (London) Ltd | Construction | 2023 |