| Oxford (Online) Group Limited | Financial services | 2024 |
| Oxford 161 Limited | Hospitality | 2025 |
| Oxford Aotea Healthcare PVT Limited | Health & social care | 2023 |
| Oxford Barbecues Limited | Wholesale & retail | 2012 |
| Oxford Content Company Limited | Professional & scientific | 2012 |
| Oxford Custom Orthotics Ltd | Health & social care | 2013 |
| Oxford Environmental Limited | Professional & scientific | 2010 |
| Oxford Examinations & Accreditation Board | Education | 1993 |
| Oxford Fire Consultants Limited | Extraterritorial | 2023 |
| Oxford Heating and Plumbing Ltd | Extraterritorial | 2021 |
| Oxford Imaging Consultants Ltd | Health & social care | 2022 |
| Oxford IT Services Ltd | Information & communication | 2026 |
| Oxford Language Nest Ltd | Education | 2024 |
| Oxford Medical Intelligence Limited | Wholesale & retail | 2013 |
| Oxford Mobility Installations Ltd | Construction | 2011 |
| Oxford Optronix (Solutions) Ltd | Professional & scientific | 2020 |
| Oxford Optronix Limited | Professional & scientific | 1991 |
| Oxford Performance Limited | Administrative & support | 2023 |
| Oxford Plumbing and Heating Ltd | Construction | 2014 |
| Oxford Poultry Limited | Agriculture & fishing | 2011 |
| Oxford Prescribing Group Limited | Health & social care | 2026 |
| Oxford Storage Limited | Real estate | 2020 |
| Oxfordshire Car Sourcing Ltd | Transport & logistics | 2026 |
| Oxfordshire Consultancy UK Ltd | Professional & scientific | 2025 |
| Oxfordshire Electrical Limited | Construction | 2018 |
| Oxfordshire Finance Ltd | Financial services | 2022 |
| Oxfordshire Fuels Limited | Water & waste | 2010 |
| Oxfordshire Hotels Ltd | Hospitality | 1995 |
| Oxfordshire Inns Ltd | Financial services | 2020 |
| Oxfordshire Kitchen Ltd | Education | 2026 |
| Oxfordshire Knee Clinic Limited | Health & social care | 2022 |
| Oxfordshire Lifesciences Limited | Professional & scientific | 2014 |
| Oxfordshire Motors Ltd | Wholesale & retail | 2025 |
| Oxfordshire PAT Testers Ltd | Construction | 2026 |
| Oxfordshire Plumbing and Heating Ltd | Extraterritorial | 2021 |
| Oxfordshire Property Investments Ltd | Real estate | 2022 |
| Oxfordshire Tiling Supplies Limited | Wholesale & retail | 2012 |
| Oxfordshire Tyres and Recovery Ltd | Wholesale & retail | 2024 |
| Oxfordshire Volunteer Befriending CIC | Health & social care | 2016 |
| Oxgov Ltd | Real estate | 2024 |
| Oxigram Limited | Professional & scientific | 2017 |
| Oxluxury Ltd | Real estate | 2024 |
| Oxon Architectural Services Limited | Professional & scientific | 2010 |
| Oxon Boat Painting Company Ltd. | Manufacturing | 2011 |
| Oxon Cars Limited | Transport & logistics | 2024 |
| Oxon Heat Ltd | Construction | 2022 |
| Oxon Physiotherapy Limited | Health & social care | 2026 |
| Oxon Transport Ltd | Transport & logistics | 2026 |
| Oxtuneclub Ltd | Wholesale & retail | 2021 |
| Oxyclean Co Ltd | Administrative & support | 2025 |
| P & H Bradshaw LLP | | 2023 |
| P & I Rowe Limited | Professional & scientific | 2002 |
| P G Lewis Forestry LLP | | 2022 |
| P S R Services Limited | Other services | 2002 |
| P&P Financial Care Consultancy Limited | Financial services | 2012 |
| P&R Trans-Build Ltd | Construction | 2025 |
| P. Jacob Ltd | Wholesale & retail | 2024 |
| P.F. Miles Decorating Limited | Construction | 2007 |
| P.Shirley Electrical Limited | Construction | 1993 |
| P.W. Property Services Limited | Real estate | 1997 |
| P8666 LLP | | 2026 |
| Paced Care Solutions Limited | Administrative & support | 2022 |
| Packman Construction Ltd | Construction | 2020 |
| Page Eight Limited | Professional & scientific | 2013 |
| Paigham International Limited | Information & communication | 2016 |
| Paladin Risk Management Ltd | Administrative & support | 2016 |
| Palico Limited | Other services | 1993 |
| Pall Mall Capital Partners Limited | Financial services | 2023 |
| Palmcedar Consulting Limited | Real estate | 2020 |
| Palmers Wood Limited | Financial services | 2024 |
| Palpet Limited | Information & communication | 2024 |
| Pamo Pizza Ltd | Hospitality | 2024 |
| Panabuild Innovations Limited | Construction | 2023 |
| Paperbased Limited | Manufacturing | 2022 |
| Parantuca and Co Limited | Professional & scientific | 2017 |
| Paratus Developments Limited | Professional & scientific | 2003 |
| Parchvale Limited | Manufacturing | 1980 |
| Parents Talking Asperger's CIC | Administrative & support | 2019 |
| Parkcharm Properties Limited | Construction | 1994 |
| Parker James Chauffeurs Limited | Transport & logistics | 2016 |
| Parklands Interiors Ltd | Wholesale & retail | 2011 |
| Pasmeg Limited | Health & social care | 2011 |
| Pasture Provisions Ltd | Agriculture & fishing | 1990 |
| Pathway Send Solutions Limited | Professional & scientific | 2025 |
| Patricia Steele Limited | Health & social care | 2010 |
| Patronu Sweepers Limited | Administrative & support | 2017 |
| Paul Clarkson Homes Ltd | Construction | 2012 |
| Paul Hopkins Specialist Installations Limited | Manufacturing | 2004 |
| Paul Joseph Hairdressing Ltd | Other services | 2013 |
| Paul Joseph Hairdressing(Uk) Limited | Other services | 2026 |
| Paul Riley Cars Ltd | Wholesale & retail | 2017 |
| Paul TEW Construction Limited | Construction | 2014 |
| Paul Williams Builders and Decorators Limited | Construction | 1975 |
| Pauphna Limited | Transport & logistics | 2022 |
| Pavillion END Limited | Extraterritorial | 2013 |
| Paving Sandstone Imports Ltd | Wholesale & retail | 2025 |
| Pavlo Smart Colour Ltd | Wholesale & retail | 2018 |
| PB Electrical Limited | Real estate | 2002 |
| PBT Law Limited | Professional & scientific | 2026 |
| PBX Constructions (Oxon) Ltd | Construction | 2026 |