| Oxford Biotherapeutics Ltd | Professional & scientific | 2003 |
| Oxford Biriyanis Ltd | Hospitality | 2025 |
| Oxford Block Management Ltd | Households | 2020 |
| Oxford Blue Gifts Limited | Wholesale & retail | 2022 |
| Oxford Boat House Ltd | Hospitality | 2011 |
| Oxford Boat Tours Ltd | Transport & logistics | 2026 |
| Oxford Book of World Records Limited | Information & communication | 2022 |
| Oxford Books Limited | Information & communication | 1984 |
| Oxford Bottle Shop Ltd | Wholesale & retail | 2023 |
| Oxford Brain Diagnostics Ltd | Information & communication | 2018 |
| Oxford Brewery Limited | Manufacturing | 2018 |
| Oxford Brickwork Ltd | Construction | 2005 |
| Oxford Brookes Enterprises Limited | Administrative & support | 1988 |
| Oxford Brookes Students' Union Ltd | Other services | 2021 |
| Oxford Buffet Ltd | Hospitality | 2014 |
| Oxford Builders Merchants Limited | Extraterritorial | 2021 |
| Oxford Building Company Limited | Construction | 2008 |
| Oxford Building Construction Limited | Construction | 2025 |
| Oxford Building Control Consultancy Ltd | Professional & scientific | 2014 |
| Oxford Building Projects Limited | Construction | 2015 |
| Oxford Bulgarian School Slovo Ltd | Education | 2015 |
| Oxford Business College UK Limited | Education | 2006 |
| Oxford Business Partners Ltd | Information & communication | 2003 |
| Oxford Bi̇rsöz Initiative C.I.C. | Education | 2023 |
| Oxford Cafe Grill Ltd | Hospitality | 2026 |
| Oxford Canal Festival CIC | Administrative & support | 2023 |
| Oxford Cancer Analytics Ltd | Professional & scientific | 2020 |
| Oxford Capital Fund, LP | | 2009 |
| Oxford Capital Group Ltd | Financial services | 2024 |
| Oxford Capital Partners (Advisors) Limited | Extraterritorial | 2002 |
| Oxford Capital Partners Holdings Limited | Professional & scientific | 1999 |
| Oxford Capital Partners LLP | | 2012 |
| Oxford Car Sales Ltd | Manufacturing | 2018 |
| Oxford Carbon Trading Limited | Other services | 2008 |
| Oxford Cardiologist Ltd | Health & social care | 2019 |
| Oxford Cardiothoracic Partners Ltd | Health & social care | 2014 |
| Oxford Cardiovascular Health Ltd | Health & social care | 2023 |
| Oxford Carpentry Ltd | Construction | 2023 |
| Oxford Carpets & Furniture Ltd | Manufacturing | 2021 |
| Oxford Cars Limited | Transport & logistics | 2013 |
| Oxford Castle Estates Ltd | Real estate | 2026 |
| Oxford Catapult Ltd | Professional & scientific | 2017 |
| Oxford Central Chiropractic Clinic Limited | Health & social care | 2006 |
| Oxford Centre for Artificial Intelligence | Education | 2021 |
| Oxford Centre for Diagnostics Limited | Health & social care | 2023 |
| Oxford Centre for Education and Research in Palliative Care: Sobell House | Education | 2017 |
| Oxford Centre for Hebrew and Jewish Studies | Education | 1973 |
| Oxford Centre for Impact Research Ltd | Information & communication | 2021 |
| Oxford Centre for Mission Studies | Education | 1984 |
| Oxford Centre for Neurorehabilitation Science (Oxcns) Ltd | Health & social care | 2025 |
| Oxford Centre for the Mind Limited | Education | 2018 |
| Oxford Centre Lodge Ltd | Hospitality | 2024 |
| Oxford Chamber Music Foundation Limited | Arts & recreation | 2000 |
| Oxford Cheltenham Properties Limited | Real estate | 2022 |
| Oxford Chinese Food Limited | Hospitality | 2016 |
| Oxford Chinese Medicine Research Centre Limited | Extraterritorial | 2020 |
| Oxford Christmas Market Ltd | Other services | 2023 |
| Oxford Cinematograph Theatre COMPANY(1922)LIMITED(THE) | Real estate | 1922 |
| Oxford City & County Bowls Club Limited | Arts & recreation | 2001 |
| Oxford City & County Bowls Development Company Limited | Arts & recreation | 2001 |
| Oxford City Academy for Education and Development (Oaed) Limited | Professional & scientific | 2004 |
| Oxford City Athletic Club CIC | Education | 2018 |
| Oxford City Cars Ltd | Transport & logistics | 2012 |
| Oxford City Developments Limited | Real estate | 2000 |
| Oxford City Farm | Agriculture & fishing | 2010 |
| Oxford City Football Club (Trading) Limited | Arts & recreation | 1995 |
| Oxford City Football Club 1882 Ltd | Arts & recreation | 2017 |
| Oxford City Garage Limited | Wholesale & retail | 2026 |
| Oxford City Housing (Development) Limited | Construction | 2016 |
| Oxford City Housing (Investment) Limited | Real estate | 2016 |
| Oxford City Housing Limited | Real estate | 2016 |
| Oxford City Link Ltd | Transport & logistics | 2023 |
| Oxford City Properties Limited | Construction | 2017 |
| Oxford City Stars Ice Hockey Club Ltd | Arts & recreation | 2019 |
| Oxford Cleaners Ltd | Administrative & support | 2025 |
| Oxford Cleaning Group Ltd | Administrative & support | 2026 |
| Oxford Climate Policy | Professional & scientific | 2005 |
| Oxford Clinica Limited | Professional & scientific | 2025 |
| Oxford Clinical Research Ltd. | Professional & scientific | 2019 |
| Oxford Coaching Partners Limited | Professional & scientific | 2025 |
| Oxford Coffins Limited | Other services | 2004 |
| Oxford Cognitive Behavioural Therapy Ltd | Health & social care | 2013 |
| Oxford College ODL Limited | Professional & scientific | 2003 |
| Oxford College of Accountancy Limited | Extraterritorial | 1999 |
| Oxford College of Advanced Science and Technology Limited | Information & communication | 2025 |
| Oxford College of Education and Training Ltd | Education | 2026 |
| Oxford College of Law Limited | Extraterritorial | 1999 |
| Oxford College of Leadership and Management Limited | Extraterritorial | 1999 |
| Oxford College of Purchasing & Supply Ltd | Education | 2011 |
| Oxford Collegiate Limited | Hospitality | 2012 |
| Oxford Community Action C.I.C. | Health & social care | 2020 |
| Oxford Community Football Ltd | Arts & recreation | 2025 |
| Oxford Community Work Agency Limited | Health & social care | 1984 |
| Oxford Company Cleaning Ltd | Administrative & support | 2025 |
| Oxford Company Management Limited | Information & communication | 2014 |
| Oxford Computer Group Worldwide Ltd | Information & communication | 2015 |
| Oxford Computer Training Limited | Extraterritorial | 2007 |
| Oxford Conferences Ltd | Administrative & support | 2025 |
| Oxford Consult Limited | Professional & scientific | 2000 |
| Oxford Consulting Partners Ltd | Professional & scientific | 2006 |