| Perpetua in Perpetuum Ltd | Professional & scientific | 2014 |
| Perry Carroll Consulting Ltd | Professional & scientific | 2016 |
| Perscitus Solutions Limited | Information & communication | 2008 |
| Pershore Management Company Limited | Households | 2022 |
| Personable Computers Ltd | Information & communication | 2002 |
| Personal Care Regulatory Ltd. | Professional & scientific | 2011 |
| Personalised Property Solutions Limited | Real estate | 2016 |
| Personalised Virtual Employee Limited | Professional & scientific | 2019 |
| Personi Ltd | Information & communication | 2026 |
| Peru International Fisheries Alliance Co., Ltd | Wholesale & retail | 2025 |
| Pervasid Limited | Information & communication | 2011 |
| Peryt Medical Ltd | Health & social care | 2025 |
| Pesapeer Investments Ltd | Financial services | 2022 |
| Pesapeer Payments Limited | Financial services | 2019 |
| Pest Right Limited | Agriculture & fishing | 2011 |
| Pet Planet Global Alliance | Agriculture & fishing | 2025 |
| Petalar Accommodation Limited | Real estate | 2021 |
| Petalion Therapeutics Limited | Professional & scientific | 2023 |
| Petatech Ltd | Manufacturing | 2024 |
| Petclubs Limited | Other services | 2015 |
| Pete & Rach Ltd | Information & communication | 2020 |
| Pete Beachill Music Limited | Information & communication | 2012 |
| Peter Andrews Construction Limited | Construction | 2010 |
| Peter Dann Group Limited | Professional & scientific | 2025 |
| Peter Dann Holdings Limited | Professional & scientific | 2006 |
| Peter Dann Limited | Professional & scientific | 1986 |
| Peter Geach Associates Ltd | Professional & scientific | 2013 |
| Peter George Town Planning Ltd | Professional & scientific | 2023 |
| Peter Graves Florist Ltd | Wholesale & retail | 2017 |
| Peter Jean Consulting Ltd | Professional & scientific | 2024 |
| Peter Loudon Consulting Ltd | Professional & scientific | 2022 |
| Peter Rawlings Architects Ltd | Professional & scientific | 2013 |
| Peter Saunders Builders Limited | Construction | 1996 |
| Peter Studdert Planning Limited | Professional & scientific | 2011 |
| Peterborough & Stamford Chamber of Commerce Limited | Professional & scientific | 2021 |
| Peterborough Bathrooms & Kitchens Ltd | Extraterritorial | 2024 |
| Peterborough Chamber of Commerce Limited | Professional & scientific | 2005 |
| Peterhouse Conferences and Events Limited | Hospitality | 2014 |
| Peterhouse Financial Planning Ltd | Financial services | 2010 |
| Peterkin Psychology Services Limited | Education | 2021 |
| Peters Elworthy & Moore Limited | Professional & scientific | 1986 |
| Petersfield College Ltd | Professional & scientific | 2022 |
| Petersfield Mansions Management Company Limited | Households | 1994 |
| Petersfields LLP | | 2008 |
| Petite Jolie Bakehouse Ltd | Manufacturing | 2025 |
| Petkov Avio MEC Ltd | Manufacturing | 2026 |
| Petra Troost (UK) Limited | Professional & scientific | 2023 |
| Petre Catalin Ltd | Manufacturing | 2025 |
| Petrenko International Ltd | Manufacturing | 2026 |
| Petrotechnix Ltd | Professional & scientific | 2012 |
| Pevensie Consulting Limited | Professional & scientific | 2019 |
| Pexabo Ltd | Information & communication | 2017 |
| Pfas-X Ltd | Water & waste | 2025 |
| PFC Engineering Limited | Wholesale & retail | 2004 |
| PFD111 Ltd | Construction | 2025 |
| Pfeifer & Langen UK Limited | Manufacturing | 2025 |
| Pfentech Ltd | Professional & scientific | 2024 |
| PGC Construct Ltd | Administrative & support | 2017 |
| PGC Medical Ltd | Health & social care | 2026 |
| PH Aviation Services Ltd | Manufacturing | 2025 |
| PH Shift Limited | Professional & scientific | 2025 |
| Phair Property Holdings Ltd | Real estate | 2021 |
| Phantasma Creative Ltd | Professional & scientific | 2024 |
| Phantom Technology Limited | Information & communication | 2019 |
| Pharcom International Ltd | Professional & scientific | 2023 |
| Pharma Quality Assured Ltd | Administrative & support | 2025 |
| Pharmaceuticalclinician Ltd | Education | 2024 |
| Pharmacovigilancefirst Limited | Professional & scientific | 2018 |
| Pharmafind.Ai Ltd | Information & communication | 2026 |
| Pharmaguide Ltd | Professional & scientific | 2004 |
| Pharmasol Ltd | Health & social care | 2023 |
| Pharmasys Consulting Limited | Professional & scientific | 2019 |
| Pharmdev Ltd | Professional & scientific | 2015 |
| Pharmenable Therapeutics Limited | Professional & scientific | 2016 |
| Pharmhall Limited | Administrative & support | 2013 |
| Phase Hire Limited | Other services | 2003 |
| PHASE7 Limited | Professional & scientific | 2006 |
| Phasebraid Ltd | Professional & scientific | 2026 |
| Phasecurve Software Ltd | Information & communication | 2026 |
| Phenix World Ltd | Wholesale & retail | 2025 |
| Phenohealthai Limited | Information & communication | 2025 |
| Phil Ashworth Ltd. | Information & communication | 2004 |
| Phil Carter Limited | Administrative & support | 2002 |
| Phil Edwards Painting & Decorating Limited | Construction | 2011 |
| Phil Mcdiarmid Property Management Ltd | Real estate | 2004 |
| Phil Wright Consultancy Limited | Information & communication | 1999 |
| Philcopters Ltd | Manufacturing | 2025 |
| Philip Biggs Brass Festivals Limited | Arts & recreation | 1997 |
| Philip Boswell Homes Limited | Construction | 2016 |
| Philip Graves Consulting Ltd | Professional & scientific | 2025 |
| Philip Jarvis Ltd | Manufacturing | 2018 |
| Phillips and Co Surveyors Limited | Professional & scientific | 2005 |
| Phillips Dempsey Ltd | Professional & scientific | 2009 |
| Phillips Dixon Limited | Real estate | 2022 |
| Philoxenia Studios Ltd | Hospitality | 2023 |
| Phixflow Ltd | Information & communication | 2004 |
| PHL Publishing Limited | Information & communication | 2012 |
| Phlight Global Trading Limited | Wholesale & retail | 2024 |
| Phoebe Trevor Limited | Real estate | 2017 |
| Phoenix & Peony Ltd | Real estate | 2023 |