| Pilehigh Ltd | Manufacturing | 2007 |
| Pine Rise Management Company Ltd | Households | 2019 |
| Pineshark Ltd | Manufacturing | 2024 |
| Pioneer Landscapes and Maintenance Ltd | Administrative & support | 2025 |
| Piper UK Limited | Wholesale & retail | 2005 |
| Pitch Green Investments Limited | Professional & scientific | 2011 |
| Platinum Choice Limited | Financial services | 2007 |
| Playroom Connect Ltd | Information & communication | 2022 |
| Polstead House (Oxford) Limited | Households | 1987 |
| Porthall Garages Ltd | Wholesale & retail | 2021 |
| Portland House Development Company Newcastle Limited | Financial services | 2020 |
| Power Progress Consultancy Limited | Wholesale & retail | 2017 |
| Powerconnect Pro Limited | Construction | 2025 |
| Powernetix Technologies Limited | Manufacturing | 2025 |
| Pregnancy Matters Limited | Health & social care | 2008 |
| Prep-App Limited | Information & communication | 2022 |
| Prestidge Beauty Ltd | Other services | 2014 |
| Prestige Renovations & Maintenance Ltd | Construction | 2024 |
| Prima Gardener Ltd | Professional & scientific | 2018 |
| Pro G Ltd | Arts & recreation | 2026 |
| PRO4 Solutions Limited | Information & communication | 2006 |
| Proactive.Aero Ltd | Information & communication | 2013 |
| Proceda Ltd | Construction | 2022 |
| Project Bagh Ltd | Wholesale & retail | 2026 |
| Promoting Economic Pluralism | Information & communication | 2016 |
| PSI CRO UK Limited | Professional & scientific | 2008 |
| Ptu-Repair Ltd | Professional & scientific | 2023 |
| PUB Opco Limited | Hospitality | 2023 |
| Publishing House Management Limited | Real estate | 2015 |
| Pulsemint Ltd | Information & communication | 2025 |
| Purewal Properties Investment Ltd | Administrative & support | 2018 |
| Quantum Advanced Solutions Ltd | Manufacturing | 2019 |
| Quantum Fabrix Limited | Manufacturing | 2024 |
| QUE Property Group Ltd | Real estate | 2022 |
| Quickfood Limited | Information & communication | 2022 |
| Quint Projects Limited | Professional & scientific | 2025 |
| Quinton Property Holdings Limited | Real estate | 2015 |
| QUT Services Limited | Health & social care | 2020 |
| R Carroll Consulting Ltd | Financial services | 2024 |
| R Didcock Plumbing & Heating Ltd | Construction | 2023 |
| R Firkin Accountancy Services Limited | Professional & scientific | 2008 |
| R&A (Oxford) Ltd | Wholesale & retail | 2019 |
| R&J Family Pubs Ltd | Hospitality | 2025 |
| R&M Handyman Limited | Construction | 2019 |
| R-Research Limited | Professional & scientific | 2011 |
| R.C.O. Management Limited | Households | 1981 |
| R.J. Clayton Ltd | Other services | 2010 |
| Rachel Rahman Limited | Professional & scientific | 2020 |
| Radcliffe and Co Plumbing and Heating Ltd | Construction | 2026 |
| Radley House (Oxford) Limited | Households | 1983 |
| RAF & JO Building and Cleaning Services Ltd | Construction | 2024 |
| Ramak Properties Ltd | Real estate | 2022 |
| Ramzan Sports Ltd | Wholesale & retail | 2025 |
| Raphael Design Limited | Professional & scientific | 2003 |
| Rawstone Consulting Ltd | Professional & scientific | 2018 |
| RAY Gasson and Associates Limited | Professional & scientific | 1991 |
| RBM Civil Engineering Ltd | Administrative & support | 2015 |
| REA Barns Limited | Professional & scientific | 2025 |
| Reeah IT Consulting Services Limited | Information & communication | 2024 |
| Reeds Management Services Ltd | Professional & scientific | 2024 |
| Reeds Solicitors LLP | | 2017 |
| Regent AI Ltd | Information & communication | 2022 |
| Regime Health & Wellbeing Ltd. | Manufacturing | 2024 |
| Regulatory Insights Ltd | Professional & scientific | 2024 |
| Reknow Ltd | Health & social care | 2025 |
| Renepower Energy Ltd | Energy | 2020 |
| Reneprop Ltd | Real estate | 2019 |
| Rentsafe Ltd | Information & communication | 2023 |
| Repair My Phone (Oxford) Limited | Manufacturing | 2017 |
| Research Alpha Limited | Information & communication | 2024 |
| Resonance Intelligence Ltd | Information & communication | 2025 |
| Resonance Technology Limited | Information & communication | 2026 |
| RFA (EOT) Limited | Financial services | 2023 |
| Richard John Francis Limited | Construction | 2012 |
| Richard Wallace Limited | Other services | 2009 |
| Ridentes Limited | Health & social care | 2020 |
| Rising Youth Entrepreneurship CIC | Education | 2026 |
| Risk Analysis LLP | | 2015 |
| Riverfront Residents Association (West Court, Osney) Limited | Real estate | 1974 |
| RJM Developments Oxford Limited | Construction | 2024 |
| RJN Holdco Limited | Financial services | 2024 |
| RMW (Witney) Ltd | Manufacturing | 1999 |
| Roaming Innovation Limited | Information & communication | 2014 |
| ROB Phayre Ltd | Information & communication | 2021 |
| Robert's Garden Machinery Limited | Manufacturing | 2014 |
| Robin Preschool | Education | 2013 |
| Rock Management Services Ltd | Professional & scientific | 2002 |
| Rock Software Limited | Information & communication | 2021 |
| Rockbriar Limited | Wholesale & retail | 1993 |
| Roma's Collection Limited | Wholesale & retail | 2024 |
| Roman Court East Molesey Management Company Ltd | Households | 2023 |
| Ronishca Limited | Wholesale & retail | 2023 |
| Roof Right Ltd | Construction | 2025 |
| RPL AL Limited | Manufacturing | 2025 |
| RPM Aviation Ltd | Manufacturing | 2020 |
| Rppg Theol Consultant Limited | Education | 2012 |
| RT Logistics Services Ltd | Transport & logistics | 2024 |
| RT Logy Services Ltd | Transport & logistics | 2026 |
| Running Edge Alignment Designs Ltd | Professional & scientific | 2023 |
| Runtribe Ltd | Arts & recreation | 2025 |