| Oxford Hi-Tech Solutions Limited | Wholesale & retail | 2014 |
| Oxford Homes and Developments Ltd | Construction | 2025 |
| Oxford Housing Limited | Real estate | 2020 |
| Oxford Kings Baseball Club | Arts & recreation | 2013 |
| Oxford Longevity Project CIC | Education | 2024 |
| Oxford Marquees Limited | Administrative & support | 2010 |
| Oxford Motor Services Limited | Wholesale & retail | 2017 |
| Oxford Parent-Infant Project | Health & social care | 2005 |
| Oxford Photovoltaics Limited | Professional & scientific | 2010 |
| Oxford Physios Limited | Health & social care | 2017 |
| Oxford Professional Services Ltd | Financial services | 2020 |
| Oxford Propulsion Limited | Manufacturing | 2020 |
| Oxford PV Limited | Professional & scientific | 2014 |
| Oxford Quantum Solutions Ltd | Professional & scientific | 2021 |
| Oxford RD Development Ltd | Real estate | 2025 |
| Oxford Security Systems Ltd | Administrative & support | 2024 |
| Oxford Shine Air B&B Ltd | Administrative & support | 2025 |
| Oxford Solar Limited | Professional & scientific | 2014 |
| Oxford Solar Technology Limited | Professional & scientific | 2014 |
| Oxford Spires Cremations Ltd | Other services | 2022 |
| Oxford Technical Solutions Limited | Manufacturing | 1998 |
| Oxford Travel Transport Ltd | Transport & logistics | 2021 |
| Oxford Vehicle Conversions Limited | Manufacturing | 2024 |
| Oxford Vehicle Servicing Limited | Wholesale & retail | 2008 |
| Oxford Wealth Solutions Limited | Financial services | 2020 |
| Oxford West Property Management Company Limited | Real estate | 2020 |
| Oxford Women's Clinic Ltd | Information & communication | 2019 |
| Oxfordians Cleaning Services Ltd | Administrative & support | 2021 |
| Oxfordshine Ltd | Administrative & support | 2022 |
| Oxfordshire Anaesthesia Ltd | Health & social care | 2023 |
| Oxfordshire Building Services Ltd | Construction | 2015 |
| Oxfordshire Construction Management Consultancy Limited | Construction | 2025 |
| Oxfordshire Federation of Women's Institutes | Other services | 1992 |
| Oxforge Ltd | Construction | 2017 |
| Oxhold Limited | Construction | 2010 |
| Oxhomes Ltd | Construction | 2020 |
| Oxit Limited | Information & communication | 2010 |
| Oxlight Ltd | Manufacturing | 2020 |
| Oxmanor Homes Ltd | Construction | 2023 |
| OXO Trading Cards Ltd | Wholesale & retail | 2025 |
| Oxon Consultancy Services Ltd | Professional & scientific | 2018 |
| Oxon Properties Ltd | Real estate | 2020 |
| Oxon-Retina Limited | Health & social care | 2017 |
| Oxonia Care Consultancy Limited | Health & social care | 2024 |
| Oxrend Ltd | Construction | 2018 |
| Oxweb Digital Services Ltd | Information & communication | 2024 |
| OZO Innovations EBT Trustee Limited | Financial services | 2017 |
| OZO Innovations Limited | Manufacturing | 2012 |
| P&R Holdings Ltd | Real estate | 2025 |
| P&T Property Limited | Real estate | 2019 |
| P.D. Smith Ltd | Other services | 2010 |
| P3 Engineering Ltd. | Manufacturing | 2013 |
| Paintbox Commercials Limited | Manufacturing | 2018 |
| Pampeano Limited | Wholesale & retail | 2008 |
| Panda Tape Ltd | Wholesale & retail | 2024 |
| Paradise Coffee Limited | Hospitality | 2024 |
| Paradise Oxford Ltd | Real estate | 2020 |
| Park Display Holdings Ltd | Financial services | 2020 |
| Park Display Trustees Limited | Administrative & support | 2020 |
| Park Farm (Northmoor) Management Company Limited | Households | 2018 |
| Park Flooring Bicester Ltd | Wholesale & retail | 2024 |
| Park Lane Bathstone Limited | Mining & quarrying | 2018 |
| Park View (Oxford) Management Company Limited | Households | 2014 |
| Parke Lane People Limited | Administrative & support | 2018 |
| Parshad Ltd | Hospitality | 2020 |
| Partnered People Ltd | Financial services | 2023 |
| Patch Locum Services Ltd | Wholesale & retail | 2022 |
| Pattern Technology Limited | Professional & scientific | 2017 |
| Paul Basham Associates Limited | Professional & scientific | 2009 |
| PB Accountants Ltd | Professional & scientific | 2016 |
| PB Locums Limited | Administrative & support | 2014 |
| PB Motors Oxford Limited | Wholesale & retail | 2014 |
| Peach Site Management Limited | Construction | 2014 |
| Peacock Investment Advisors Limited | Financial services | 2024 |
| Pearn Kandola (International) Limited | Professional & scientific | 2022 |
| Pearn Kandola Digital Solutions Limited | Professional & scientific | 2017 |
| Pearn Kandola LLP | | 2009 |
| Pebzz Trading Ltd | Wholesale & retail | 2024 |
| Peerless Properties (Oxford) Ltd | Professional & scientific | 2006 |
| Peerless Properties Ltd | Real estate | 2014 |
| Pelagro Ltd | Wholesale & retail | 2024 |
| Penhurst Court Limited | Households | 1991 |
| Penny Lane Inc Limited | Wholesale & retail | 2024 |
| Pennyjas Health Care & Services Ltd | Administrative & support | 2021 |
| Pentallion International Logistics Limited | Manufacturing | 2022 |
| Peptide Groove LLP | | 2013 |
| Perfect Finish Paint Shop Limited | Wholesale & retail | 2023 |
| Perfflux Ltd | Information & communication | 2025 |
| Perrinn Limited | Professional & scientific | 2011 |
| Perry's Court Limited | Construction | 2018 |
| Petros Geoscience Limited | Professional & scientific | 2000 |
| PGL Ventilation Limited | Construction | 2017 |
| Pharaoh Golf Co Ltd | Wholesale & retail | 2021 |
| PHD2B Limited | Information & communication | 2023 |
| PHG Building Services Ltd | Construction | 2020 |
| Philips Court Management Limited | Households | 2003 |
| Physioex Ltd | Wholesale & retail | 2025 |
| Pickle Lending Ltd | Financial services | 2019 |
| Picoliar Limited | Manufacturing | 2025 |
| Piece of Cake Theatre and Events Productions Ltd | Arts & recreation | 2024 |