| Oxon Property Management Limited | Households | 2021 |
| Oxon Property Specialists Limited | Real estate | 2022 |
| Oxon Retail Limited | Wholesale & retail | 2017 |
| Oxon Ride Ltd | Transport & logistics | 2025 |
| Oxon Services Ltd | Transport & logistics | 2026 |
| Oxon Solar PV Ltd | Extraterritorial | 2025 |
| Oxon Traders Ltd | Wholesale & retail | 2021 |
| Oxon Windows and Doors Ltd | Construction | 2021 |
| Oxon.Tech Ltd | Information & communication | 2017 |
| Oxonia Limited | Health & social care | 2019 |
| Oxonian Urology Services Ltd | Health & social care | 2023 |
| Oxotec Ltd | Administrative & support | 2016 |
| Oxpacss Limited | Professional & scientific | 2017 |
| Oxpad Limited | Real estate | 2015 |
| Oxperial Biohealth Ltd | Manufacturing | 2024 |
| Oxphrd Ltd | Health & social care | 2011 |
| Oxphysio Limited | Health & social care | 2026 |
| Oxpizza Ltd | Hospitality | 2025 |
| Oxpress Limited | Extraterritorial | 2016 |
| Oxprime Limited | Financial services | 2022 |
| Oxpro Limited | Information & communication | 2018 |
| Oxquant Consulting Limited | Information & communication | 2001 |
| Oxrad Limited | Health & social care | 2022 |
| Oxrefurbs Ltd | Construction | 2025 |
| Oxsoft Limited | Administrative & support | 1984 |
| Oxsolar Ltd | Construction | 2011 |
| Oxsonics Limited | Manufacturing | 2013 |
| Oxsource Ltd | Administrative & support | 2019 |
| Oxspace Group Ltd | Real estate | 2024 |
| Oxspheric Limited | Hospitality | 2014 |
| Oxtec Electrical Ltd | Construction | 2024 |
| Oxtech Facilities Ltd | Construction | 2020 |
| Oxtech Ventures Ltd | Professional & scientific | 2023 |
| Oxtractor Limited | Information & communication | 2017 |
| Oxtwo Ltd | Hospitality | 2024 |
| Oxua Incubator Ltd | Information & communication | 2023 |
| Oxuniprint Limited | Extraterritorial | 1984 |
| OXV Limited | Financial services | 2023 |
| Oxvolt Limited | Professional & scientific | 2021 |
| Oxvr EBT Ltd. | Professional & scientific | 2018 |
| Oxware Ltd | Information & communication | 2024 |
| Oxwed LLP | | 2021 |
| Oxwill Limited | Real estate | 2023 |
| Oxwood Group Ltd | Information & communication | 2021 |
| Oxxon Therapeutics Limited | Professional & scientific | 1998 |
| OXY Bakery Cafe Limited | Hospitality | 2025 |
| OXY Oriental Limited | Hospitality | 2004 |
| Oxylis Consulting Ltd | Professional & scientific | 2025 |
| Oxylis Ltd | Professional & scientific | 2021 |
| Oxysystems Limited | Administrative & support | 2012 |
| Oyster Travel Ltd | Administrative & support | 2014 |
| Ozairis Ltd | Wholesale & retail | 2025 |
| Ozols Energy Limited | Professional & scientific | 2026 |
| P & GR Fennell Ltd | Real estate | 2017 |
| P & L Groom Limited | Health & social care | 2004 |
| P & M Oxford Ltd | Real estate | 2025 |
| P & N Services (Oxford) Ltd | Real estate | 2026 |
| P and G Consultancy Services Limited | Administrative & support | 2014 |
| P B Roberts Limited | Construction | 2014 |
| P D G Properties Limited | Real estate | 2014 |
| P Hadway Limited | Health & social care | 2014 |
| P J a Williams & Sons Construction Ltd | Construction | 2003 |
| P J Busby Joinery Limited | Manufacturing | 2012 |
| P J Gillham (Painting & Decorating) Ltd | Construction | 2007 |
| P M L Projects Limited | Professional & scientific | 2000 |
| P&C IT Consultants Limited | Other services | 2023 |
| P&G Prosthetics Laboratory Ltd | Manufacturing | 2025 |
| P&P (Oxford) Ltd | Professional & scientific | 2024 |
| P. & R. Roofing Limited | Construction | 2005 |
| P. J. East Limited | Construction | 2012 |
| P. Risborough Developments Limited | Construction | 2024 |
| P.H.Consulting Limited | Health & social care | 1998 |
| P.M. Casterton Ltd | Other services | 2010 |
| P.S. Software Consultants Limited | Information & communication | 1984 |
| P3MO Ltd | Information & communication | 2018 |
| Pablo Martinez ENT Limited | Health & social care | 2012 |
| Paccar Financial PLC | Financial services | 2001 |
| Paccar Parts U.K. Limited | Wholesale & retail | 1993 |
| Paccar Trucks U.K. Ltd | Manufacturing | 1998 |
| Pack of Trades Ltd | Construction | 2025 |
| Pada Catering Ltd | Hospitality | 2025 |
| Paddick & Kelly Limited | Administrative & support | 2003 |
| Padel People (Holdings) Ltd | Financial services | 2026 |
| Padel People Ltd | Arts & recreation | 2022 |
| Padel People Partners (Holdings) Limited | Financial services | 2025 |
| Padel People Partners Ltd | Arts & recreation | 2024 |
| Padel People X Toptier Padel Ltd | Arts & recreation | 2026 |
| Paediatric Acupuncture Limited | Health & social care | 2023 |
| Pailebote Limited | Administrative & support | 2013 |
| Painting by Numbers Limited | Wholesale & retail | 2018 |
| PAK Halal Erdem Food Centre Limited | Wholesale & retail | 2016 |
| Paladin Health Ltd | Professional & scientific | 2010 |
| Palestinu Ltd | Wholesale & retail | 2025 |
| Pali Text Society Limited (the) | Information & communication | 1963 |
| Palla VOY Ltd | Hospitality | 2023 |
| Palmer-Broughton Limited | Health & social care | 2021 |
| PAM Life Sciences Ltd | Professional & scientific | 2026 |
| Pampando Limited | Wholesale & retail | 2021 |
| PAN European Consultancy Services LLP | | 2007 |
| Pan-World Logistics Limited | Transport & logistics | 2009 |