| Oxford Granite Ltd | Manufacturing | 2009 |
| Oxford Heatpumps Ltd | Extraterritorial | 2009 |
| Oxford Intellectual Limited | Information & communication | 2006 |
| Oxford Partitions Limited | Construction | 2001 |
| Oxford Telecom Ltd | Administrative & support | 2017 |
| Oxford WET N Wild Limited | Arts & recreation | 2017 |
| Oxfordshire Carpentry Limited | Manufacturing | 2025 |
| Oxfordshire Handyman Ltd | Other services | 2026 |
| Oxfordshire Therapy Limited | Health & social care | 2013 |
| Oxycliff Limited | Construction | 1977 |
| Oxyplumb Ltd | Construction | 2018 |
| P & M Sands Limited | Administrative & support | 2014 |
| P.G. Hawkins Building Contractors Limited | Construction | 2017 |
| Pals Travel Ltd | Transport & logistics | 2023 |
| Panoptex Limited | Information & communication | 2026 |
| Paravant Limited | Professional & scientific | 2013 |
| Parinova Ltd | Professional & scientific | 2026 |
| Parker-Miller Office Limited | Professional & scientific | 2024 |
| PARTNERS4GROWTH Limited | Administrative & support | 2009 |
| Paul Brown Consultancy Ltd | Professional & scientific | 2025 |
| Paul Greenwood Limited | Professional & scientific | 2015 |
| Pcmj Catering Limited | Administrative & support | 2017 |
| PDP the Property Development People Ltd | Construction | 2025 |
| Peaches of Carterton Limited | Other services | 2002 |
| Pearce PG Ltd | Real estate | 2026 |
| Pearson Construction Limited | Construction | 2005 |
| Penny Place Management Company Limited | Households | 2026 |
| Percy Place Limited | Households | 2023 |
| Perfect Bindery Solutions LLP | | 2009 |
| Perfect Image Solutions LLP | | 2010 |
| Perfect Solutions Group UK Ltd | Wholesale & retail | 2023 |
| Perficient Pharm Ltd | Wholesale & retail | 2023 |
| Pestakers Limited | Agriculture & fishing | 2025 |
| Philament Forge Ltd | Manufacturing | 2025 |
| Phinalize Ltd | Information & communication | 2025 |
| Pixel Death Software Limited | Information & communication | 2016 |
| PM Sushi Ltd | Hospitality | 2026 |
| Powering Hub Ltd | Professional & scientific | 2024 |
| Precision Surveying Limited | Professional & scientific | 2005 |
| Preece Court Management Company Limited | Real estate | 2003 |
| Premier Gardens (Brize Norton) Limited | Administrative & support | 2010 |
| Pressed for Time Construction Cleaning Ltd | Administrative & support | 2026 |
| Pressed for Tyme Limited | Other services | 2019 |
| Pressed Linen Limited | Other services | 2022 |
| Procure Solutions (UK) Limited | Professional & scientific | 2012 |
| Project Design and Refurbishment Ltd | Construction | 2023 |
| Project Design Services Limited | Professional & scientific | 2007 |
| Project Landscapes Ltd | Construction | 2021 |
| Property Conservation Services Limited | Other services | 1993 |
| Pure Pellet Limited | Wholesale & retail | 2016 |
| Push Start Marketing Limited | Administrative & support | 2014 |
| Quantum Healing Source Limited | Health & social care | 2014 |
| R & R Industries Limited | Real estate | 1994 |
| R C Finishers Ltd | Construction | 2018 |
| R T Management Services Ltd | Administrative & support | 2015 |
| Radical Rugby Limited | Arts & recreation | 2017 |
| Raise Workshops Ltd | Health & social care | 2019 |
| RAM Robotics Ltd | Professional & scientific | 2024 |
| Rate Services Limited | Information & communication | 2018 |
| Rbvisuals Ltd | Information & communication | 2026 |
| Rebel Wrench Mechanics Ltd | Wholesale & retail | 2009 |
| Redelevencreative Limited | Professional & scientific | 2014 |
| Reed Horizon Ltd | Extraterritorial | 2024 |
| Refss Ltd | Wholesale & retail | 2017 |
| Renewvation Limited | Construction | 2015 |
| Repair Experts Limited | Manufacturing | 2018 |
| Repair Guys (Oxfordshire) Limited | Manufacturing | 2019 |
| Revamptech Works Limited | Other services | 2024 |
| Revilo Plumbing & Heating Limited | Construction | 2022 |
| Rhodes Building Limited | Construction | 2023 |
| Rhodes Electrical Limited | Construction | 2022 |
| Richens and Wastie Estates Ltd | Administrative & support | 2017 |
| Rick Simon Audio Services Limited | Information & communication | 2002 |
| Ripp Management Limited | Administrative & support | 2006 |
| Rjcc Events Ltd | Information & communication | 2024 |
| RK Evans Property Ltd | Real estate | 2025 |
| Rksmall Property Ltd | Real estate | 2025 |
| Rock-Venture Designs Limited | Construction | 2021 |
| ROD Hyatt Limited | Wholesale & retail | 2009 |
| Rosemary Ferguson Nutrition Limited | Health & social care | 2012 |
| Rosenworth Limited | Wholesale & retail | 2025 |
| S&M Reality Groups Limited | Construction | 2025 |
| S. J. Mcbride Limited | Construction | 2003 |
| Sabinet Enterprises Limited | Education | 2003 |
| Sabir Property Ltd | Construction | 2026 |
| Sandford Ventures Ltd | Professional & scientific | 2025 |
| Santorini Holdings Limited | Real estate | 2018 |
| Sapient Insight Limited | Information & communication | 2023 |
| Saraim Investments Limited | Professional & scientific | 2023 |
| SAVAGE24 Ltd | Health & social care | 2025 |
| Scholars Meadow Limited | Construction | 2021 |
| Scott & Associates Limited | Professional & scientific | 2018 |
| Securing Frontier Markets Limited | Professional & scientific | 2025 |
| Sertix Solutions Limited | Construction | 2016 |
| Servflo Plumbing & Heating Ltd | Construction | 2024 |
| Shehu Transport Ltd | Transport & logistics | 2024 |
| Sheilan Care Services Ltd | Health & social care | 2026 |
| Shekhinah Glory Tours PVT Ltd | Administrative & support | 2025 |
| Sherborne Capital Limited | Financial services | 2025 |
| Shillbrook Court Residents Association Limited | Households | 1973 |