| Phnix UK Ltd | Manufacturing | 2010 |
| Phoebe Court Management Company Limited | Households | 1995 |
| Phoenix Global Solutions Ltd | Wholesale & retail | 2017 |
| Phoenix Hair Ltd | Other services | 2018 |
| Phonemax Accessories Ltd | Wholesale & retail | 2020 |
| Photocrowd Ltd | Arts & recreation | 2012 |
| Physical Activity & Sports Specialists Limited | Education | 2013 |
| PIA Jewellery Direct Limited | Wholesale & retail | 2012 |
| Piazza Teatro Ltd | Hospitality | 2023 |
| Piceras Group Ltd | Financial services | 2020 |
| Picker HWA Ltd | Professional & scientific | 2021 |
| Picker Institute Europe | Professional & scientific | 2000 |
| Pickwicks Guest House Ltd | Hospitality | 2026 |
| Pickwicks Oxford Ltd | Hospitality | 2011 |
| Picosm Ltd | Information & communication | 2014 |
| Picton Asset Management Limited | Financial services | 2019 |
| Piczo Photography Limited | Professional & scientific | 2018 |
| Pietersen Fine Furniture Limited | Manufacturing | 2013 |
| Piezoplasma Ltd | Professional & scientific | 2017 |
| Pihu Enterprises Limited | Wholesale & retail | 2018 |
| Pihu Properties Limited | Real estate | 2019 |
| Pilgrims Devs Ltd | Professional & scientific | 2026 |
| Pilgrims Limited | Extraterritorial | 1976 |
| Pillar Analytica Ltd | Financial services | 2022 |
| Pilot Flight Training Ltd | Administrative & support | 2019 |
| Pinbridge Ltd | Wholesale & retail | 2025 |
| Pinch Health and Social Alternative Provisions Ltd | Information & communication | 2024 |
| Pindy's Samosas Ltd | Wholesale & retail | 2019 |
| Pinehurst Property Limited | Real estate | 2024 |
| Pines Green Ltd | Real estate | 2023 |
| Pines Properties Ltd | Real estate | 2022 |
| Pinewood Court Residents' Association Limited | Households | 1989 |
| Pinguela Limited | Real estate | 2022 |
| Pink Scribe Ltd | Information & communication | 2022 |
| Pink Scribe Properties Ltd | Real estate | 2026 |
| Pink Spade Limited | Administrative & support | 2012 |
| Pinky Light Ltd | Wholesale & retail | 2025 |
| Pinpoint Consulting Services Limited | Administrative & support | 2007 |
| Pioneer Publications Ltd | Information & communication | 2021 |
| Pioneers London Ltd | Hospitality | 2023 |
| Piper Books Ltd | Information & communication | 2008 |
| Piper Ceramics Limited | Manufacturing | 2025 |
| Piranha Photography Limited | Information & communication | 2008 |
| Pitchgrade Limited | Construction | 2021 |
| Pitts Road Garage Ltd | Wholesale & retail | 2023 |
| Pixel Biology Ltd | Information & communication | 2023 |
| Pixym Limited | Information & communication | 2026 |
| Pizza Box Andover Ltd | Hospitality | 2018 |
| Pizza Box Oxford Ltd | Hospitality | 2018 |
| Pizza Fabbrica Ltd | Hospitality | 2020 |
| Pizza House Bicester Akhtar Limited | Hospitality | 2022 |
| Pizza Pronto Ltd | Hospitality | 2017 |
| PJ Nexum Limited | Professional & scientific | 2025 |
| PJ Oxford Ltd | Hospitality | 2018 |
| PJN Global Holdings Ltd | Financial services | 2025 |
| PJS Property Development Limited | Construction | 2018 |
| Pkmua Ltd | Other services | 2026 |
| Plaha Neurosurgical Limited | Health & social care | 2014 |
| Plainlaw LLP | | 2003 |
| Plan & Invest Ltd | Professional & scientific | 2022 |
| Plan 1 Ideas Limited | Information & communication | 2020 |
| Planet Positive Printing Limited | Professional & scientific | 2017 |
| Plant Your Future Trading Limited | Agriculture & fishing | 2023 |
| Plantnetwork. | Education | 1999 |
| Plastic Reconstructive Surgery Ltd | Real estate | 2018 |
| Plastow's Travel Limited | Transport & logistics | 2016 |
| Platebright Limited | Extraterritorial | 2005 |
| Plateworth Ltd | Information & communication | 2026 |
| Platinum Counselling and Psychotherapy Ltd | Health & social care | 2021 |
| Platinum Peak Properties Ltd | Construction | 2026 |
| Platinum Roofing and Builders Ltd | Construction | 2023 |
| Platinum Roofing Oxfordshire Ltd | Construction | 2025 |
| Platinum Services Oxford Ltd | Education | 2018 |
| Platus Limited | Hospitality | 2019 |
| Playequip Limited | Construction | 2016 |
| Playground Management Limited | Other services | 2000 |
| Playsafety Limited | Administrative & support | 2005 |
| Playtime Global Ltd | Information & communication | 2024 |
| Pledge Editing Limited | Information & communication | 2017 |
| Pleiotropy Ltd | Information & communication | 2022 |
| PLM (UK) Limited | Water & waste | 2013 |
| PLM Logistics Ltd | Transport & logistics | 2022 |
| Plumbing Innovations Ltd | Construction | 2026 |
| Plummer Property Consulting Ltd | Construction | 2010 |
| Plush @ the Union Bar Ltd | Hospitality | 2018 |
| Plush Properties (Oxford) Ltd | Real estate | 2018 |
| Plusultra Pharma UK Ltd | Manufacturing | 2020 |
| Plyable Ltd | Manufacturing | 2012 |
| PM Oxford Building Services Ltd | Construction | 2016 |
| PML Fire & Safety Ltd | Other services | 2017 |
| Point a Ltd | Construction | 2012 |
| Pokhara Oxford Ltd | Hospitality | 2019 |
| Polaoptix Technologies Limited | Manufacturing | 2025 |
| Polar DRY Cleaning Ltd | Other services | 2018 |
| Polic Dogs Limited | Wholesale & retail | 2022 |
| Policy Design Ltd | Professional & scientific | 2021 |
| Polish School Oxford | Education | 2016 |
| Polish Shop Littlemore Ltd | Wholesale & retail | 2022 |
| Polski Sklep Holloway Ltd | Wholesale & retail | 2025 |
| Polski Sklep Littlemore Ltd | Wholesale & retail | 2025 |