| Oxford Oscint Limited | Information & communication | 2022 |
| Oxford Osteopaths Ltd | Health & social care | 2020 |
| Oxford Ouds Ltd | Manufacturing | 2021 |
| Oxford Paediatric Dietitians Limited | Health & social care | 2024 |
| Oxford Panini Cafe Limited | Hospitality | 2025 |
| Oxford Paperbacks Limited | Information & communication | 1984 |
| Oxford Paralegal Services Ltd | Professional & scientific | 2022 |
| Oxford Payments Consultancy Limited | Professional & scientific | 2019 |
| Oxford Payroll Partners Limited | Professional & scientific | 2013 |
| Oxford People Solutions Limited | Professional & scientific | 2023 |
| Oxford Performance Works Ltd | Wholesale & retail | 2012 |
| Oxford Perinatal Ltd | Health & social care | 2023 |
| Oxford Petroleum Research Associates Limited | Administrative & support | 2001 |
| Oxford Pharmacy Ltd | Wholesale & retail | 2017 |
| Oxford Pharmagenesis Limited | Information & communication | 1998 |
| Oxford Phoenix Rising CIC | Education | 2025 |
| Oxford Pictures Limited | Arts & recreation | 2013 |
| Oxford Pilates Limited | Health & social care | 2013 |
| Oxford Plan and Build Ltd | Construction | 2017 |
| Oxford Plans Limited | Real estate | 2019 |
| Oxford Plant & Contracting Ltd | Construction | 2018 |
| Oxford Plastic Surgery Limited | Agriculture & fishing | 2010 |
| Oxford Playhouse Productions Limited | Arts & recreation | 2000 |
| Oxford Policy Management EBT Ltd | Other services | 2016 |
| Oxford Policy Management Limited | Professional & scientific | 1995 |
| Oxford Praxis LAB Limited | Education | 2026 |
| Oxford Premier Chauffeurs Ltd | Transport & logistics | 2024 |
| Oxford Premier Hospitality Ltd | Hospitality | 2026 |
| Oxford Preservation Trust | Arts & recreation | 1927 |
| Oxford Press Limited | Information & communication | 1995 |
| Oxford Prestige Chauffeurs Ltd | Transport & logistics | 2025 |
| Oxford Pride Group Ltd | Other services | 2003 |
| Oxford Prime Executive Cars Limited | Transport & logistics | 2025 |
| Oxford Print Company Ltd | Manufacturing | 2022 |
| Oxford Pristine Cleaning Ltd | Administrative & support | 2023 |
| Oxford Private Care Limited | Health & social care | 2005 |
| Oxford Pro Musica Concert Society Limited | Arts & recreation | 1973 |
| Oxford Productions Ltd | Information & communication | 2019 |
| Oxford Products Limited | Manufacturing | 1983 |
| Oxford Professional Assessment and Certification Organisation Ltd | Education | 2025 |
| Oxford Professional Education Group Limited | Education | 1997 |
| Oxford Professional Education Limited | Education | 2023 |
| Oxford Programs Limited | Education | 2007 |
| Oxford Progress Limited | Professional & scientific | 2002 |
| Oxford Properties Investment Limited | Real estate | 2009 |
| Oxford Property Care Ltd | Administrative & support | 2025 |
| Oxford Property Consulting Ltd | Other services | 2016 |
| Oxford Property Developments Limited | Real estate | 2023 |
| Oxford Property Edge Limited | Real estate | 2016 |
| Oxford Property Group Ltd | Professional & scientific | 2019 |
| Oxford Property Licence Applications Limited | Professional & scientific | 2022 |
| Oxford Property Partners Ltd | Construction | 2025 |
| Oxford Prospects and Global Development Centre | Education | 2019 |
| Oxford Protection Services Ltd | Administrative & support | 2022 |
| Oxford Psychiatry Group Limited | Health & social care | 2025 |
| Oxford Psychodynamics Ltd | Health & social care | 2022 |
| Oxford Psychologists Ltd | Health & social care | 2010 |
| Oxford Publishing Limited | Information & communication | 1983 |
| Oxford Quality Maintenance Limited | Construction | 2022 |
| Oxford Quantum Limited | Real estate | 2025 |
| Oxford Real Estate Limited | Real estate | 2003 |
| Oxford Real Limited | Real estate | 1998 |
| Oxford Reference Limited | Information & communication | 1984 |
| Oxford Reform Club,Limited(The) | Hospitality | 1926 |
| Oxford Renew Tech Heating Limited | Construction | 2023 |
| Oxford Renovate Ltd | Construction | 2025 |
| Oxford Reproductive Health Ltd | Health & social care | 2022 |
| Oxford Reproductive Medicine Group Ltd | Professional & scientific | 2012 |
| Oxford Reprogenome Limited | Professional & scientific | 2025 |
| Oxford Research & Development Partners Limited | Professional & scientific | 2017 |
| Oxford Research South Africa Limited | Health & social care | 2000 |
| Oxford Review of Economic Policy Limited | Information & communication | 1984 |
| Oxford RI Limited | Hospitality | 2025 |
| Oxford Rigging Limited | Information & communication | 2009 |
| Oxford Rising Stars Limited | Arts & recreation | 2022 |
| Oxford River Cruises Holdings Limited | Professional & scientific | 2008 |
| Oxford River Cruises Ltd | Arts & recreation | 2008 |
| Oxford RMC Science Ltd | Professional & scientific | 2024 |
| Oxford Road Residences Ltd | Real estate | 2022 |
| Oxford Road Tenancy Limited | Agriculture & fishing | 2019 |
| Oxford Robotic Surgery Ltd | Health & social care | 2022 |
| Oxford Roof Ltd | Construction | 2023 |
| Oxford Rowing Services Ltd | Manufacturing | 2025 |
| Oxford Royale Academy Limited | Education | 2017 |
| Oxford Rugby Football Club Limited | Arts & recreation | 2023 |
| Oxford Said Business School Limited | Education | 1994 |
| Oxford Sauna Ltd | Health & social care | 2022 |
| Oxford Sawmill Limited | Agriculture & fishing | 2024 |
| Oxford Scholars Ltd | Education | 2026 |
| Oxford Scholars Press Limited | Information & communication | 2003 |
| Oxford Scholars Programme Ltd | Education | 2023 |
| Oxford Scholastica Academy Ltd | Education | 2011 |
| Oxford School of Advanced Tesol Studies Limited | Information & communication | 2020 |
| Oxford School of English Language Ltd | Education | 2002 |
| Oxford Schools Chaplaincy | Education | 2010 |
| Oxford Science Editing Limited | Professional & scientific | 2011 |
| Oxford Science Enterprises Holdings II Limited | Financial services | 2025 |
| Oxford Science Enterprises Holdings Limited | Financial services | 2021 |
| Oxford Science Enterprises PLC | Financial services | 2014 |
| Oxford Scientia Ltd | Information & communication | 2024 |