| Outside the Box Consultancy Limited | Wholesale & retail | 2017 |
| Ovata Limited | Financial services | 2020 |
| Owen IT Solutions Limited | Information & communication | 2013 |
| Oxfordshire Estates Limited | Agriculture & fishing | 2013 |
| Oxland Construction Consulting Ltd | Construction | 2023 |
| Oxley Law Limited | Professional & scientific | 2013 |
| Oxus Business Consulting Limited | Professional & scientific | 2020 |
| Ozzie's BB Limited | Hospitality | 2026 |
| P & J Holdings Limited | Administrative & support | 1963 |
| P & K Composites Limited | Manufacturing | 2006 |
| P Griffin Consulting Limited | Professional & scientific | 2019 |
| P I Marketing Limited | Professional & scientific | 1997 |
| P J S Associates Limited | Information & communication | 2009 |
| P&A (Bristol) Ltd | Construction | 2023 |
| P&A Griffiths Consulting Limited | Administrative & support | 2024 |
| P&C Automotive Limited | Wholesale & retail | 2024 |
| P&G Trading Ltd | Hospitality | 2026 |
| P&J Southern Properties Ltd | Real estate | 2019 |
| P.A.C. Engineering Limited | Manufacturing | 1982 |
| P.G. Dunn Tree & Landscaping Ltd | Administrative & support | 2023 |
| P.Stone Plumbing & Heating Ltd | Construction | 2025 |
| P31 Property Limited | Real estate | 2020 |
| PA Knight Limited | Financial services | 2011 |
| Pa&D Limited | Real estate | 2017 |
| Pacey's Properties Limited | Real estate | 2019 |
| Paediatric-Care Limited | Health & social care | 2023 |
| Page a Consulting Limited | Professional & scientific | 2023 |
| Page Bungay Ltd | Financial services | 2022 |
| Page Consultants Ltd | Professional & scientific | 2021 |
| Pagt Limited | Transport & logistics | 2019 |
| Pain Consultancy Limited | Health & social care | 2018 |
| Paint and Lime Ltd | Construction | 2025 |
| Palace Digital Limited | Information & communication | 2018 |
| Palisade Digital Ltd | Information & communication | 2024 |
| Pallant Holdings Limited | Financial services | 2025 |
| Palmer 1961 Limited | Extraterritorial | 2014 |
| Pambry Electronics Limited | Wholesale & retail | 1972 |
| Pamphill Interiors Limited | Manufacturing | 2018 |
| PAN Biotech UK Ltd | Wholesale & retail | 2013 |
| Panautomate Ltd | Professional & scientific | 2019 |
| Pandora's Bakery Limited | Manufacturing | 2022 |
| Pandora’S Shop and Catering Ltd | Hospitality | 2024 |
| Panospitality Ltd | Real estate | 2026 |
| Pantusso Limited | Administrative & support | 2008 |
| Panurgy Performance Development Ltd | Professional & scientific | 2012 |
| Papershake Limited | Arts & recreation | 2014 |
| Parabellum Consulting Limited | Professional & scientific | 2012 |
| Paradise Farms Limited | Other services | 1994 |
| Paragon Travel PHC Ltd | Other services | 2010 |
| Paragon Travel Private Hire Ltd | Other services | 2013 |
| Pare Hair Co Ltd | Other services | 2019 |
| Parivya Quality Imaging and Sound Consulting Limited | Information & communication | 2026 |
| Park View (Bournemouth) Limited | Real estate | 2024 |
| Parkdene Property Services Ltd | Real estate | 2018 |
| Parker Health Ltd | Professional & scientific | 2012 |
| Parkinson Professional Services Limited | Professional & scientific | 2023 |
| Parlick Safety Services Limited | Professional & scientific | 2024 |
| Parma Gray Limited | Other services | 2005 |
| Parmar Properties Group Limited | Real estate | 2025 |
| Parmiter Holdings Ltd | Extraterritorial | 2011 |
| Parrot Parcels Ltd | Transport & logistics | 2013 |
| Partners for Transformation Limited | Professional & scientific | 2019 |
| Partners SMR Limited | Wholesale & retail | 2006 |
| Party Wall Works Ltd | Information & communication | 2017 |
| Pass Service Charge Accountants Limited | Professional & scientific | 1997 |
| Passion for Strategy Ltd | Professional & scientific | 2020 |
| Patara Consulting Ltd | Professional & scientific | 2012 |
| Patchton Plumbing & Heating Ltd | Construction | 2018 |
| Path Life Fencing and Landscaping Limited | Administrative & support | 2017 |
| Pathilux Tech Limited | Information & communication | 2025 |
| Pathway Solutions Limited | Professional & scientific | 2023 |
| Pathways 2 Change Ltd | Health & social care | 2020 |
| Patrick Foss-Smith Technical Services Ltd | Professional & scientific | 2015 |
| Patrick's Events Limited | Hospitality | 2020 |
| Patroe Medical Limited | Health & social care | 2024 |
| Pattco Limited | Professional & scientific | 2006 |
| Paul Chadwick Leadership Coaching Ltd | Professional & scientific | 2022 |
| Paul Harrison Design Services Ltd. | Professional & scientific | 2017 |
| Paul J Bushby Ltd | Wholesale & retail | 2014 |
| Paul Mist Ltd | Information & communication | 2019 |
| Pausa Vita Health Ltd | Health & social care | 2026 |
| PAW by PAW Training Limited | Education | 2015 |
| Pawelek Ltd | Transport & logistics | 2017 |
| Pawheads Limited | Professional & scientific | 2019 |
| Paymea Limited | Manufacturing | 2017 |
| Pazo Services Ltd | Other services | 2018 |
| PCA Consulting Ltd | Information & communication | 2024 |
| Pccj Ltd | Financial services | 2022 |
| PCH Properties Ltd | Real estate | 2015 |
| PCS Cables & Connectors Limited | Manufacturing | 1993 |
| PD Advisors Ltd | Professional & scientific | 2022 |
| PDN Security Solutions Ltd | Information & communication | 2026 |
| Pdss Ltd | Real estate | 2019 |
| Pdttech Ltd | Information & communication | 2013 |
| PE Marine Designz Limited | Professional & scientific | 2004 |
| Peach Pearl Ltd | Real estate | 2007 |
| Peak Electrics Limited | Construction | 2025 |
| PEB IT Solutions Ltd | Information & communication | 2021 |
| Peekaboo Broadstone Ltd | Hospitality | 2025 |
| Peeking Duck Ltd | Manufacturing | 2017 |