| Oxford Aesthetics (Oxon) Limited | Health & social care | 2017 |
| Oxford Aesthetics Limited | Health & social care | 2017 |
| Oxford Anaesthesiology Services Limited | Health & social care | 2023 |
| Oxford Brickwork and Masonry Limited | Construction | 2017 |
| Oxford Ceramics Limited | Wholesale & retail | 2006 |
| Oxford Medical Uro-Oncology Limited | Health & social care | 2009 |
| Oxford Oak Tree Surgery Ltd | Agriculture & fishing | 2009 |
| Oxford Online Marketing Solutions Limited | Professional & scientific | 2009 |
| Oxford Sustainability Services Ltd | Professional & scientific | 2026 |
| Oxford Tutoria Limited | Education | 2025 |
| Oxfordgc Ltd | Wholesale & retail | 2021 |
| Oxfordimpex Ltd | Wholesale & retail | 2024 |
| Oxfordshire Anaesthetics Limited | Health & social care | 2023 |
| Oxfordshire Stoves and Interiors Limited | Wholesale & retail | 2024 |
| OXG MIK Limited | Health & social care | 2023 |
| Oyetech Ltd | Information & communication | 2013 |
| P B Marine Consulting Limited | Professional & scientific | 2010 |
| P G Rowe Limited | Professional & scientific | 2023 |
| P J B Cladding Services Ltd | Construction | 1994 |
| P J Bridger Limited | Transport & logistics | 2017 |
| P L Schoolwear Limited | Professional & scientific | 2009 |
| P M Wilden Ltd | Wholesale & retail | 2021 |
| P R & J M Jennings Limited | Professional & scientific | 2014 |
| P&C Consulting Services Ltd | Administrative & support | 2018 |
| P&M Collective Ltd | Real estate | 2026 |
| P&M Mason Property Limited | Real estate | 2021 |
| P&P Financial Consultancy Ltd | Professional & scientific | 2020 |
| P&S Property Solutions Ltd | Construction | 2014 |
| P.J. Murphy Plant Hire Limited | Administrative & support | 2020 |
| P.L. Clothing Ltd | Manufacturing | 2015 |
| P.Mas Property Ltd | Wholesale & retail | 2022 |
| P.S. Tilbury (2020) Ltd | Wholesale & retail | 2020 |
| P.S. Tilbury (Aylesbury) Limited | Wholesale & retail | 1986 |
| P.T. Demolition Limited | Construction | 2001 |
| P.W.N. Steepe Property Developments Limited | Construction | 1997 |
| P3 LDN Ltd | Wholesale & retail | 2023 |
| P4 Associates Limited | Professional & scientific | 2007 |
| P4BESPOKE Ltd | Other services | 2021 |
| Pa-Abz Ltd | Real estate | 2025 |
| PAC Solutions Limited | Information & communication | 2018 |
| Pace Automotive Bedford Ltd | Wholesale & retail | 2018 |
| Pace Automotivez Ltd | Wholesale & retail | 2020 |
| Pacific Marketing Labs Ltd | Information & communication | 2022 |
| Pack and Store UK Ltd | Transport & logistics | 2018 |
| Packer Properties Limited | Real estate | 2021 |
| Pacna Ltd | Construction | 2025 |
| Pact Developments Limited | Construction | 2014 |
| PAD Transport Ltd | Transport & logistics | 2026 |
| Padco Property Ltd | Real estate | 2025 |
| Paddlecroft Limited | Real estate | 2022 |
| Paddock Close Management Company Limited | Households | 2010 |
| Padero Solaer Ltd | Construction | 2012 |
| Page Electrical Contractors Ltd | Construction | 2022 |
| Pahervash Limited | Wholesale & retail | 2025 |
| PAI Skincare Limited | Manufacturing | 2006 |
| Paisano Limited | Wholesale & retail | 2020 |
| Palepu Ltd | Information & communication | 2019 |
| Palladian Properties (Silverstone) Ltd | Administrative & support | 2006 |
| Palmers Furnishings Limited | Manufacturing | 2013 |
| Palnatitech Ltd | Information & communication | 2025 |
| Palura and Rodriguez Business Development Services Ltd | Professional & scientific | 2025 |
| PAM Finance Limited | Professional & scientific | 2023 |
| Pamela Jane Limited | Hospitality | 2025 |
| Pamfilconstruct Ltd | Construction | 2025 |
| PAN Logistics Limited | Transport & logistics | 2023 |
| PAN Sports Ltd | Professional & scientific | 2020 |
| Panache Care Ltd | Hospitality | 2018 |
| Panashe Residential Ltd | Health & social care | 2024 |
| Panchatantra Limited | Hospitality | 2020 |
| Panda Advisory Limited | Professional & scientific | 2022 |
| Panda Heating Limited | Construction | 2015 |
| Pandyrye Limited | Wholesale & retail | 1979 |
| Pani Trans Ltd | Transport & logistics | 2022 |
| Panoptic Business Solutions Limited | Professional & scientific | 2014 |
| Panther International Limited | Information & communication | 2009 |
| Paper FIG (Assets) Limited | Real estate | 2026 |
| Paper Place Studios Ltd | Arts & recreation | 2026 |
| Paradigm Electrical Solutions Limited | Professional & scientific | 2018 |
| Paragon Resources Limited | Professional & scientific | 2022 |
| Paramount Homes & Developments Ltd | Hospitality | 2025 |
| Parasol Property Limited | Real estate | 2021 |
| Pardhan Investments Ltd. | Real estate | 2013 |
| Paris Associates Limited | Information & communication | 2017 |
| Park Health and Safety Limited | Professional & scientific | 2023 |
| Park Street Flats (Aylesbury) Management Company Ltd | Households | 2025 |
| Parkes Healthcare Ltd | Health & social care | 2023 |
| Parkfield Advisory Limited | Administrative & support | 2014 |
| Parkside Financial Planning Ltd | Financial services | 2022 |
| Parkside Investments (Beaconsfield) Limited | Real estate | 1959 |
| Parmenion Global Ltd. | Administrative & support | 2022 |
| Parrott & Coales LLP | | 2007 |
| Pars Consulting Limited | Information & communication | 2015 |
| Pars Motor Ltd | Wholesale & retail | 2026 |
| Part 2 Properties Ltd | Real estate | 2016 |
| Parton Road Properties Limited | Real estate | 1963 |
| Pasiega Pictures Ltd | Information & communication | 2025 |
| Pata Store Ltd | Wholesale & retail | 2020 |
| Patel Builder Aylesbury Ltd | Construction | 2026 |
| Paternoster Communications Limited | Professional & scientific | 2018 |
| Paternoster Property Presentation Limited | Administrative & support | 2016 |