| Oxford Security Center Limited | Administrative & support | 2021 |
| Oxford Semantic Technologies Limited | Information & communication | 2016 |
| Oxford Semiconductors Limited | Information & communication | 2024 |
| Oxford Sensors & Controls Estates Limited | Real estate | 2024 |
| Oxford Sensors & Controls Limited | Other services | 2012 |
| Oxford Shared Living Limited | Real estate | 2016 |
| Oxford Shop Ltd | Wholesale & retail | 2017 |
| Oxford Short Lettings Ltd | Administrative & support | 2018 |
| Oxford Skin Oncology Limited | Health & social care | 2021 |
| Oxford Smart Property Limited | Real estate | 2019 |
| Oxford Smartzone Limited | Transport & logistics | 2011 |
| Oxford Smiths Electrical Services Ltd | Construction | 2024 |
| Oxford Solar PV Ltd | Construction | 2012 |
| Oxford Solutions Ltd | Professional & scientific | 2023 |
| Oxford Sound Hire Ltd | Administrative & support | 2021 |
| Oxford Source Limited | Information & communication | 2012 |
| Oxford Spares Ltd | Wholesale & retail | 2026 |
| Oxford Sparrow Ltd | Information & communication | 2024 |
| Oxford Spires International Group Limited | Financial services | 2024 |
| Oxford Spires International Ltd | Education | 2013 |
| Oxford Spires Language School Ltd | Education | 2013 |
| Oxford Spires Reif LP | | 2015 |
| Oxford Spirit Group Limited | Manufacturing | 2025 |
| Oxford SQL Solutions V2 Ltd | Information & communication | 2024 |
| Oxford Star Ltd | Hospitality | 2024 |
| Oxford Steele Limited | Hospitality | 2019 |
| Oxford Stone and Marble Limited | Construction | 2007 |
| Oxford Stone Construction Limited | Construction | 2013 |
| Oxford Storytelling Festival Limited | Administrative & support | 2017 |
| Oxford Strategy Group Limited | Professional & scientific | 2019 |
| Oxford Student Dancesport | Education | 2017 |
| Oxford Student Homes Ltd | Real estate | 2025 |
| Oxford Student Publications Limited | Information & communication | 1961 |
| Oxford Studio Orchestra Productions Limited | Arts & recreation | 2021 |
| Oxford Study Abroad Programme Ltd | Education | 2023 |
| Oxford Study Group Ltd | Education | 2023 |
| Oxford Summer Courses Limited | Education | 2012 |
| Oxford Summer Jobs Ltd | Administrative & support | 2022 |
| Oxford Support Systems Limited | Information & communication | 2005 |
| Oxford Surgical Solutions Ltd | Health & social care | 2017 |
| Oxford Sustainability Ltd | Professional & scientific | 2024 |
| Oxford Sustainable Enterprise Ltd. | Professional & scientific | 2013 |
| Oxford Sweet Home Ltd | Real estate | 2024 |
| Oxford Swim School Limited | Arts & recreation | 2007 |
| Oxford Symphony Orchestra Production Limited | Arts & recreation | 2017 |
| Oxford Synagogue & Jewish Centre Limited(The) | Education | 1974 |
| Oxford Systematic Reviews LLP | | 2020 |
| Oxford Tailoring Ltd | Other services | 2022 |
| Oxford Target Therapeutics Limited | Professional & scientific | 2022 |
| Oxford Tattoo Ltd | Other services | 2009 |
| Oxford Tattoo Makers Ltd | Other services | 2019 |
| Oxford Tattoo Removal Limited | Extraterritorial | 2011 |
| Oxford Tax Services Limited | Professional & scientific | 2023 |
| Oxford Taxi Services Ltd | Transport & logistics | 2023 |
| Oxford Taxi's Limited | Transport & logistics | 2009 |
| Oxford Team Leadership Coaching Limited | Administrative & support | 2019 |
| Oxford Technology 2 Venture Capital Trust PLC | Financial services | 2000 |
| Oxford Technology Consultants Ltd | Professional & scientific | 2000 |
| Oxford Technology Ltd | Information & communication | 2019 |
| Oxford Teddy Bear Academy Limited | Extraterritorial | 1994 |
| Oxford Thai Massage Ltd | Health & social care | 2025 |
| Oxford Therapy & Development Ltd | Professional & scientific | 2025 |
| Oxford Therapy Room Limited | Health & social care | 2020 |
| Oxford Tiles Limited | Wholesale & retail | 2023 |
| Oxford Tiling Ltd | Manufacturing | 2025 |
| Oxford Trading Limited | Professional & scientific | 2000 |
| Oxford Transfers Ltd | Transport & logistics | 2022 |
| Oxford Transformation Consulting Ltd | Information & communication | 2018 |
| Oxford Transplant Foundation | Health & social care | 2009 |
| Oxford Transport Group Limited | Transport & logistics | 2022 |
| Oxford Transport Services Ltd | Transport & logistics | 2023 |
| Oxford Travel Group Ltd. | Extraterritorial | 1998 |
| Oxford Tree Surgeons Limited | Agriculture & fishing | 2014 |
| Oxford Trust for Islamic Studies | Education | 1998 |
| Oxford Trust(The) | Professional & scientific | 1985 |
| Oxford Undertakers Ltd | Other services | 2020 |
| Oxford Union Ltd | Other services | 2015 |
| Oxford Union Society Trustee Limited | Other services | 2024 |
| Oxford Unique Trade Limited | Wholesale & retail | 2022 |
| Oxford United Community Trading Limited | Other services | 2016 |
| Oxford United Football Club Limited | Arts & recreation | 1949 |
| Oxford United in the Community | Arts & recreation | 2008 |
| Oxford United WFC Limited | Arts & recreation | 2013 |
| Oxford Universal Solutions Limited | Professional & scientific | 2019 |
| Oxford University Development Limited | Administrative & support | 2019 |
| Oxford University Endowment Management Limited | Financial services | 2007 |
| Oxford University Fixed Assets Limited | Construction | 1988 |
| Oxford University Innovation Centres Limited | Extraterritorial | 2015 |
| Oxford University Innovation Limited | Administrative & support | 1987 |
| Oxford University Property Development Limited | Administrative & support | 2019 |
| Oxford University Student Union | Education | 2010 |
| Oxford University Trading Limited | Extraterritorial | 2000 |
| Oxford Upper GI Surgery Ltd | Health & social care | 2012 |
| Oxford Urban Stay Ltd | Real estate | 2019 |
| Oxford Urology Ltd | Health & social care | 2025 |
| Oxford Vacmedix UK Limited | Professional & scientific | 2012 |
| Oxford Van MAN Ltd | Extraterritorial | 2007 |
| Oxford Venture Angels Limited | Financial services | 2025 |
| Oxford Veterinary Specialists Ltd | Professional & scientific | 2023 |
| Oxford Vintage Limited | Wholesale & retail | 2019 |