| Pazco Ltd | Other services | 2016 |
| PB Specialist Installations and Repairs Limited | Manufacturing | 2010 |
| Peajaykay Limited | Extraterritorial | 2005 |
| Pechimbert Investments Limited | Real estate | 2018 |
| Pecwom Group Ltd | Manufacturing | 2023 |
| Pecwom Homes Ltd | Real estate | 2025 |
| Pegasus Engineers Limited | Professional & scientific | 2018 |
| Penguin Fish & Chips Ltd | Hospitality | 2025 |
| Pentire Estate Planning Ltd | Professional & scientific | 2025 |
| People & Planet Student Activities Limited | Other services | 2007 |
| People and Planet Limited | Education | 1995 |
| Peoplenetics Limited | Professional & scientific | 2016 |
| Pepler Bookkeeping Limited | Professional & scientific | 2005 |
| Perspective Matters Ltd | Professional & scientific | 2019 |
| Pet Care 4 U Limited | Other services | 2017 |
| Peter B Ledbury Limited | Wholesale & retail | 1977 |
| Peter Casey Jewellery Limited | Wholesale & retail | 2016 |
| PF Civil Engineering Ltd | Construction | 2023 |
| Pharaoh's Rent Limited | Administrative & support | 2019 |
| Pharmaceutical Contract Management Limited | Professional & scientific | 2010 |
| PHD Property Investments Ltd | Real estate | 2015 |
| Philip Day Hairdressing Limited | Other services | 2011 |
| Phoenix Rehab TRL Ltd | Health & social care | 2020 |
| Phoenix Teaching Limited | Health & social care | 2019 |
| Phosphonics Holdings Limited | Professional & scientific | 2019 |
| Phosphonics Limited | Manufacturing | 2003 |
| Photoluminescent Safety Products Association | Information & communication | 1997 |
| Physiodynamics (ST Pauls) Limited | Health & social care | 2008 |
| Physionova Limited | Other services | 2023 |
| Picali GP LLP | | 2026 |
| Picali Holdco Ltd | Real estate | 2026 |
| Picali Propco 1 Ltd | Real estate | 2026 |
| Picali Propco 2 Ltd | Real estate | 2026 |
| Picali Propco 3 Ltd | Real estate | 2026 |
| Pink Horse Limited | Wholesale & retail | 2023 |
| Pink Ladies Professional Services Ltd | Construction | 2010 |
| Pitstop Properties Limited | Real estate | 2005 |
| Pizza Choice Ltd | Hospitality | 2024 |
| PJ Mccann Ltd | Construction | 2025 |
| PL Homes Ltd | Construction | 2023 |
| Plait-Inum Style Limited | Other services | 2023 |
| Play Pixel Ltd | Professional & scientific | 2012 |
| Ploceus Limited | Real estate | 2024 |
| Plumbedwright Limited | Construction | 2015 |
| Pockla Limited | Wholesale & retail | 2021 |
| Point to Point Financial Management LLP | | 2018 |
| Pole Position Scaffolding & Safety Netting Limited | Construction | 2020 |
| Polytechnique Highware Limited | Extraterritorial | 2012 |
| Poniri Kardia Limited | Other services | 2017 |
| Portside to Ltd | Wholesale & retail | 2024 |
| Precision Heating Ltd | Construction | 2013 |
| Preece and Co (UK) Ltd | Real estate | 2004 |
| Prescient Engineering Ltd | Manufacturing | 2021 |
| Presticon Estates Ltd | Real estate | 2025 |
| Prestige Electrical Services Oxon Ltd | Construction | 2018 |
| Prestigecleansox Ltd | Administrative & support | 2025 |
| Priddey Marketing Limited | Professional & scientific | 2015 |
| Primary Key Solutions Limited | Information & communication | 2005 |
| Primo House Limited | Professional & scientific | 2024 |
| Primum Wellbeing Limited | Health & social care | 2019 |
| Prism Scientific Limited | Professional & scientific | 2017 |
| Pro FIX Windows and Doors Ltd | Construction | 2015 |
| Pro Sustainability Estates Ltd | Real estate | 2026 |
| Pro Sustainability Ltd | Professional & scientific | 2020 |
| Process & Chemical Systems Limited | Professional & scientific | 2026 |
| Professional Domiciliary Care Ltd | Health & social care | 2020 |
| Profile Professional Services Ltd | Construction | 2012 |
| Profinish Oxford Ltd | Wholesale & retail | 2014 |
| Progressive Physiotherapy Limited | Health & social care | 2011 |
| Proofpoint Advisory Ltd | Professional & scientific | 2026 |
| Property France Limited | Real estate | 1983 |
| Proplumb Oxford Limited | Construction | 2015 |
| Proudlock Garden Maintenance Limited | Other services | 2019 |
| Prudenter Solutions Ltd | Professional & scientific | 2021 |
| PSI-5 Ltd | Information & communication | 2016 |
| Psyrenity Limited | Health & social care | 2019 |
| PUB Control Ltd | Information & communication | 2023 |
| Pudge Plant Hire Ltd | Administrative & support | 2025 |
| Puffett Limited | Other services | 2010 |
| Pullin Consultancy Limited | Information & communication | 2026 |
| Purdicom Limited | Information & communication | 2005 |
| Qassure Ltd | Professional & scientific | 2023 |
| QED Scientific Ltd | Wholesale & retail | 2005 |
| Quad Innovation and Environmental Ltd | Construction | 2014 |
| Quavas Limited | Health & social care | 2004 |
| Quincey Financial Consulting LLP | | 2022 |
| Quoin Health & Safety Consultants Limited | Professional & scientific | 1995 |
| R & R Plumbing Services Limited | Construction | 2019 |
| R Class Construction Ltd | Construction | 2026 |
| R M Smith Construction Ltd | Construction | 2015 |
| R P a Architects Limited | Professional & scientific | 2002 |
| R Smith & Sons Limited | Water & waste | 1992 |
| R&L Roofing & Leadwork Ltd | Construction | 2026 |
| R. W. Dawson (Roofing Contractors) Limited | Construction | 2002 |
| R.C.S. Motors Limited | Wholesale & retail | 1974 |
| Rain Labs Limited | Extraterritorial | 2014 |
| Raman Interior Designs Ltd | Manufacturing | 2026 |
| Rambles Pet Care Ltd | Other services | 2016 |
| Rambling Inns Ltd | Hospitality | 2024 |
| Randhawa & SON Ltd | Hospitality | 2019 |