| Peeple | Education | 2011 |
| Peer Pearls Ltd | Administrative & support | 2025 |
| Pegasus Engineering Ltd | Real estate | 2006 |
| Pegasus Rising Limited | Transport & logistics | 2017 |
| Pegasus Rising Property Ltd | Real estate | 2025 |
| Pegasus Theatre Productions Limited | Arts & recreation | 2014 |
| Pegasus Theatre Trust | Arts & recreation | 1995 |
| Pegg Furniture Ltd | Manufacturing | 2018 |
| Pelham and FIL Ltd | Manufacturing | 2015 |
| Pelican Land and Property Ltd | Real estate | 2018 |
| Pelican PIE Limited | Information & communication | 2022 |
| Pelvic ED Ltd | Education | 2024 |
| Pendragon Capital LLP | | 2010 |
| Pendragon Group Limited | Financial services | 2015 |
| Pendragon Homes Limited | Construction | 2015 |
| Pendragon Lodges Limited | Hospitality | 2022 |
| Penghuachg Ltd | Wholesale & retail | 2025 |
| Penguin Collectors Society | Education | 2001 |
| Penhavon Limited | Real estate | 2009 |
| Pennies From Heaven Distribution Limited | Administrative & support | 2000 |
| Pennine-Great Wall Limited | Hospitality | 1999 |
| Penny & Sinclair Holdings Limited | Professional & scientific | 2017 |
| Penny & Sinclair Limited | Real estate | 2009 |
| Penny Jayne Investments | Financial services | 2017 |
| Penrose NW Ltd | Real estate | 2022 |
| Pens Plus (of Oxford) Limited | Wholesale & retail | 2019 |
| Pentire Construction Limited | Construction | 2026 |
| Pentonville N1 Limited | Extraterritorial | 2007 |
| Pentonville Road Limited | Extraterritorial | 2007 |
| Penwarden Hale Ltd | Professional & scientific | 2015 |
| Peochar Ltd | Wholesale & retail | 2023 |
| People Health Limited | Administrative & support | 2025 |
| People Power Social Club Ltd | Other services | 2025 |
| Pepe's Oxford Limited | Hospitality | 2025 |
| Pepper & Palace Limited | Hospitality | 2025 |
| Pepper Street Consultants Limited | Professional & scientific | 2017 |
| Peppermint Mortgage Services Limited | Financial services | 2019 |
| Peregrine Holidays Limited | Other services | 1992 |
| Peregrine Ventures Ltd | Professional & scientific | 2024 |
| Perenna Services Ltd | Water & waste | 2023 |
| Perenna Stores Ltd | Wholesale & retail | 2026 |
| Perfect Hereford Ltd | Hospitality | 2022 |
| Performance Analytics and Computational Solutions RMS Limited | Professional & scientific | 2025 |
| Performance Assessments Ltd | Wholesale & retail | 2020 |
| Pergolux UK Ltd | Wholesale & retail | 2022 |
| Peri Care Ltd | Health & social care | 2019 |
| Perimeter Security Ltd | Administrative & support | 2008 |
| Perioli MAN Limited | Professional & scientific | 2007 |
| Peripear Ltd | Manufacturing | 2024 |
| Perkola Construction Ltd | Construction | 2024 |
| Permaflow Ltd | Construction | 2008 |
| Perovskite Solar Cells and Optoelectronics Limited | Education | 2020 |
| PERSEPHONE1 Limited | Administrative & support | 2025 |
| Perseus Construction Limited | Construction | 2021 |
| Personal Balance Ltd | Arts & recreation | 2011 |
| Perspectum Group Ltd | Financial services | 2021 |
| Perspectum Ltd | Professional & scientific | 2012 |
| Perthcelyn Ltd | Real estate | 2024 |
| Perturbation Ltd | Information & communication | 2024 |
| Pestox Limited | Construction | 2018 |
| Petcisely Ltd | Wholesale & retail | 2024 |
| Pete Redfern Advisory Limited | Professional & scientific | 2023 |
| Pete Webb Ltd | Wholesale & retail | 2010 |
| Peter Andrew Software Ltd | Information & communication | 2021 |
| Peter Armstrong Associates Ltd | Administrative & support | 2009 |
| Peter Atkins Limited | Arts & recreation | 2009 |
| Peter Durham & Daughters Limited | Wholesale & retail | 2014 |
| Peter Kinch Plant Limited | Administrative & support | 1967 |
| Petevowen Ltd | Health & social care | 2019 |
| Pether Performance Ltd | Wholesale & retail | 2026 |
| Petrameh Ltd | Health & social care | 2009 |
| Petroyle Restorations Limited | Wholesale & retail | 2024 |
| Pets AS Therapy | Other services | 2004 |
| Pets-Accessory Wholesale Ltd | Wholesale & retail | 2024 |
| Petseal Ltd | Professional & scientific | 2026 |
| Pettingill Technology Ltd | Professional & scientific | 2004 |
| Petts Dried Foods Ltd. | Wholesale & retail | 2023 |
| Peverel Court Limited | Health & social care | 1997 |
| Pglhproperties Limited | Real estate | 2024 |
| PH Heating and Plumbing Ltd | Construction | 2009 |
| Pharma Engineering Limited | Manufacturing | 2007 |
| Pharmaequity Ltd | Professional & scientific | 2006 |
| Pharmalearn Limited | Construction | 2025 |
| Pharmaprecision & Innovation Ltd | Wholesale & retail | 2026 |
| Pharmatelevision Ltd | Information & communication | 1999 |
| Pharmaventures Capital Ltd | Professional & scientific | 1999 |
| Pharmaventures Ltd | Professional & scientific | 1997 |
| Pharmedox Limited | Professional & scientific | 2021 |
| Phbs UK Campus | Education | 2017 |
| Phbs-Uk | Education | 2016 |
| Pheasantpubs Ltd | Hospitality | 2023 |
| Phenomenali Limited | Real estate | 2015 |
| Phil Konieczny Ltd | Education | 2017 |
| Phileos Services Ltd | Construction | 2019 |
| Philip Cadet & Co Ltd | Construction | 2011 |
| Philip Marsden Ltd | Professional & scientific | 2010 |
| Philippa Scoones Ltd | Energy | 2013 |
| Phillips Tyres Limited | Wholesale & retail | 2004 |
| Philoxenia Homes Limited | Real estate | 2023 |
| Phishar Ltd | Information & communication | 2020 |