| Oxduch Ltd | Information & communication | 2024 |
| Oxford 365 Ltd | Information & communication | 2018 |
| Oxford Agricultural Trials Limited | Professional & scientific | 1984 |
| Oxford and District Building Services Limited | Construction | 2004 |
| Oxford Aston Holding Limited | Hospitality | 2015 |
| Oxford Aviation Consultants Limited | Transport & logistics | 2018 |
| Oxford Bespoke Tailors Ltd | Manufacturing | 2026 |
| Oxford Canna Ltd | Agriculture & fishing | 2025 |
| Oxford Cesr Academy Ltd | Education | 2023 |
| Oxford Commercials Limited | Wholesale & retail | 2018 |
| Oxford Communication Skills Ltd | Education | 2025 |
| Oxford Design Studio Limited | Professional & scientific | 2011 |
| Oxford Dine Limited | Hospitality | 2025 |
| Oxford Educational Supplies Limited | Wholesale & retail | 1989 |
| Oxford Equine Vets Ltd | Professional & scientific | 2025 |
| Oxford EV Installations Ltd | Construction | 2024 |
| Oxford Fine Dining Ltd | Hospitality | 2007 |
| Oxford Honor Academy Ltd | Education | 2023 |
| Oxford Hydrotechnics Limited | Construction | 1992 |
| Oxford Impact Capital Limited | Financial services | 2022 |
| Oxford Impact Capital Ventures GP Ltd | Financial services | 2024 |
| Oxford Impact Capital Ventures Ltd | Financial services | 2024 |
| Oxford Impact Cleantech Fund LP | | 2024 |
| Oxford Information Services Limited | Information & communication | 2004 |
| Oxford Infotech Ltd | Information & communication | 2022 |
| Oxford Innovation Partners (Oxip) Ltd | Information & communication | 2021 |
| Oxford Installations Ltd | Construction | 2017 |
| Oxford Integrated Systems Limited | Information & communication | 2003 |
| Oxford Integration Limited | Construction | 2005 |
| Oxford Interior Projects Limited | Construction | 2021 |
| Oxford Legal Ltd | Professional & scientific | 2023 |
| Oxford Machining Limited | Manufacturing | 2025 |
| Oxford Martial Arts Limited | Education | 2022 |
| Oxford Medical Services Ltd | Health & social care | 2015 |
| Oxford Microbeams Limited | Manufacturing | 1992 |
| Oxford Millennium Orchestra Productions Ltd | Arts & recreation | 2025 |
| Oxford Mind & Body Limited | Health & social care | 2017 |
| Oxford Neptune Education Group Limited | Education | 2017 |
| Oxford Office Furniture Limited | Wholesale & retail | 2008 |
| Oxford Orthopaedic and Sports Medicine Limited | Hospitality | 2013 |
| Oxford PMC Ltd | Professional & scientific | 2024 |
| Oxford Publishing Consultancy Ltd | Administrative & support | 2010 |
| Oxford Recruitment Limited | Administrative & support | 2025 |
| Oxford Rehabilitation Services Limited | Health & social care | 2014 |
| Oxford Retail Limited | Information & communication | 2016 |
| Oxford Security Installations Ltd | Construction | 2024 |
| Oxford Sensors Ltd | Manufacturing | 2017 |
| Oxford Sky Ltd. | Hospitality | 2012 |
| Oxford Solar Installations Ltd | Construction | 2024 |
| Oxford Spice Limited | Hospitality | 2025 |
| Oxford Stage Hire Limited | Professional & scientific | 2011 |
| Oxford SUP Club Community Interest Company | Arts & recreation | 2020 |
| Oxford Tailor Limited | Wholesale & retail | 2018 |
| Oxford Towbars Limited | Wholesale & retail | 2015 |
| Oxford Trading Group Ltd | Wholesale & retail | 2020 |
| Oxford Urology Specialist Limited | Health & social care | 2019 |
| Oxford XXI | Professional & scientific | 2006 |
| Oxford-Scott Education Limited | Education | 2015 |
| Oxford-Scott Properties Ltd | Households | 2024 |
| Oxfordshire Cricket | Arts & recreation | 2010 |
| Oxfordshire Direct Cremations Ltd | Other services | 2026 |
| Oxfordshire Football Association Limited | Arts & recreation | 1999 |
| Oxfordshire Masters Golf Limited | Wholesale & retail | 2009 |
| Oxfordshire Retreats Ltd | Hospitality | 2025 |
| Oxfordshire Scaffolding Solutions Ltd | Construction | 2018 |
| Oxfordshire Tree Services Ltd | Agriculture & fishing | 2016 |
| Oxhab Limited | Other services | 2025 |
| Oxlease Developments Ltd | Manufacturing | 1971 |
| Oxney Quarter NO. 1 Estate Management Company Limited | Households | 2025 |
| Oxon Electrical Services Ltd | Construction | 2008 |
| Oxon Luxury Holdings Ltd | Financial services | 2023 |
| Oxon Park Recruitment Ltd | Administrative & support | 2019 |
| Oxonian Travel Services Limited, | Administrative & support | 1963 |
| Oxtrade UK Limited | Wholesale & retail | 2025 |
| OYA Holdings Ltd | Financial services | 2026 |
| OYA Homes Ltd | Health & social care | 2026 |
| OYA Property Ltd | Real estate | 2026 |
| P & a Sidgwick Limited | Real estate | 2020 |
| P & J Brown Construction Limited | Construction | 2004 |
| P Caine Electrical Services Ltd | Construction | 2019 |
| P Janecki Engineering Ltd | Construction | 2019 |
| P Schmidt (Electrical) Limited | Construction | 2018 |
| P Webb Race Prep Limited | Wholesale & retail | 2026 |
| P&C Cleaning Ltd | Administrative & support | 2023 |
| P&Cm Procurement and Contract Management Ltd | Professional & scientific | 2025 |
| P. T. Carpentry (Oxford) Ltd | Construction | 2023 |
| P.A.T. Agricultural Limited | Wholesale & retail | 2013 |
| Pace-Six-Four Ltd | Professional & scientific | 2022 |
| Pacer Leisure Vehicles International Limited | Manufacturing | 2000 |
| Padeon Ltd | Professional & scientific | 2025 |
| Page 42 Consulting Ltd | Professional & scientific | 2023 |
| Pagen Ltd | Hospitality | 2016 |
| Paige.Ai Ltd | Health & social care | 2020 |
| Paint ETC Ltd | Construction | 2018 |
| Palmerston (Mercantile) Limited | Construction | 1975 |
| PAM Brown Mortgages LLP | | 2011 |
| Panam Valves Ltd | Manufacturing | 2024 |
| Panda Premier Cleaning Ltd | Administrative & support | 2025 |
| Pankuz Care Services Limited | Health & social care | 2014 |
| Papaya CL Ltd | Information & communication | 2023 |