| Persefono Ltd | Extraterritorial | 2012 |
| Perseus (Havant) Limited | Real estate | 2026 |
| Perseus (Staines) Limited | Real estate | 2025 |
| Perseus (Weymouth) Limited | Real estate | 2026 |
| Perseus Land and Developments Limited | Construction | 2018 |
| Persian Grill Kitchen Limited | Hospitality | 2017 |
| Persica.Ai Ltd | Information & communication | 2025 |
| Personails Ltd | Construction | 2019 |
| Personal Assurance Financial Services PLC | Extraterritorial | 1991 |
| Personal Assurance Public Limited Company | Financial services | 1984 |
| Personal Assurance Services Limited | Financial services | 1996 |
| Personal Film Trading Limited | Professional & scientific | 2016 |
| Personal Group Benefits Limited | Financial services | 1996 |
| Personal Group Holdings PLC | Professional & scientific | 1996 |
| Personal Group Limited | Professional & scientific | 2015 |
| Personal Group Mobile Limited | Information & communication | 2015 |
| Personal Group Trustees Limited | Financial services | 2000 |
| Personal Management Solutions Limited | Other services | 2001 |
| Personal Paintings 4 U Limited | Extraterritorial | 2009 |
| Personal Pension Trustees Limited | Administrative & support | 1984 |
| Personalise, Accessorise & Glamorise Ltd | Wholesale & retail | 2006 |
| Perth Homes (Slough) Ltd | Real estate | 2026 |
| Perth Homes Limited | Construction | 2013 |
| Peseta Limited | Information & communication | 2024 |
| Pest Intentions Ltd | Professional & scientific | 2025 |
| Pest Mortem Pest Control Limited | Administrative & support | 2022 |
| Pestformers Ltd | Administrative & support | 2026 |
| Pestpro UK Ltd | Transport & logistics | 2011 |
| Pet Divine Ltd | Information & communication | 2020 |
| Pet Travel Services Ltd | Professional & scientific | 2021 |
| Petal and Rust Ltd | Wholesale & retail | 2023 |
| Pete Spicer Ltd | Professional & scientific | 2007 |
| Peter Daley Music Limited | Other services | 2019 |
| Peter David Homes Limited | Construction | 2016 |
| Peter Grewal Limited | Extraterritorial | 2023 |
| Peter Hill (Management) Limited | Administrative & support | 1994 |
| Peter James Property Developments Limited | Construction | 2018 |
| Peter Jones Associates Limited | Professional & scientific | 2000 |
| Peter Neyroud Research Associates Limited | Professional & scientific | 2010 |
| Peter Spence & Sons,Limited | Professional & scientific | 1900 |
| Peter Walker Joinery Limited | | 1993 |
| Peter Wheeler Interiors Limited | Construction | 2003 |
| Peterborough Dental Hub Limited | Health & social care | 2021 |
| Peterborough DH Properties Limited | Real estate | 2021 |
| Petra Estates Group Ltd | Real estate | 2025 |
| Petrofridge Ltd | Other services | 2024 |
| Petroinspec Ltd | Professional & scientific | 2026 |
| Petron Sports Limited | Wholesale & retail | 2009 |
| Petropavlovsk PLC | Mining & quarrying | 2001 |
| Petroplan Europe Ltd | Administrative & support | 2013 |
| Petroplan Holdings Ltd | Administrative & support | 2013 |
| Petroplan Limited | Administrative & support | 1976 |
| Petroplan North America Ltd | Administrative & support | 2013 |
| Pets 2 Places Limited | Transport & logistics | 2017 |
| Pets 2 Places Pet Products Ltd | Manufacturing | 2026 |
| Pets 2 Places Pet Taxi Ltd | Transport & logistics | 2026 |
| Pets 2 Places Pet Transport Research CIC | Professional & scientific | 2025 |
| Petsgang Houses Ltd | Wholesale & retail | 2023 |
| Petstore Limited | Wholesale & retail | 1989 |
| Petty, Wood & Co. Limited | Wholesale & retail | 1904 |
| Petumus Limited | Professional & scientific | 2010 |
| PF Trading Limited | Wholesale & retail | 2021 |
| PFP Printing Limited | Extraterritorial | 2008 |
| PFS Rewards Limited | Other services | 2021 |
| Pgfministries.Life Ltd | Wholesale & retail | 2020 |
| PGI Surveyors Ltd | Professional & scientific | 2026 |
| PGM (UK) Limited | Professional & scientific | 2012 |
| PGP Consulting Limited | Financial services | 2015 |
| PGS Group Ltd | Professional & scientific | 2020 |
| PGW Limited | Professional & scientific | 1998 |
| Pgwd Limited | Information & communication | 2009 |
| PH Design & Build Ltd | Construction | 2021 |
| PH Media Works Ltd | Information & communication | 2013 |
| PH Motorbikes Ltd | Wholesale & retail | 2018 |
| PHA5E Ltd | Construction | 2022 |
| Pharmabridge Solutions Ltd | Health & social care | 2025 |
| Pharmaffinity Ltd | Education | 2023 |
| Pharman Ltd. | Professional & scientific | 1981 |
| Phatbitez Ltd | Hospitality | 2024 |
| Phdfc SPV2 Limited | Construction | 2020 |
| Phdj MES & Automation Ltd | Manufacturing | 2021 |
| Pheonix Investment Limited | Real estate | 2009 |
| Pheonix JK Ltd | Professional & scientific | 2015 |
| Phew MK Limited | Transport & logistics | 2017 |
| Phexion Ltd | Professional & scientific | 2025 |
| Phico Therapeutics Limited | Manufacturing | 2000 |
| Phil Caton Ltd | Information & communication | 2013 |
| Phil Sheridan Ventures Ltd | Professional & scientific | 2024 |
| Philip Mundy Limited | Professional & scientific | 2018 |
| Philip Simpson Design Limited | Professional & scientific | 2007 |
| Phillip Welsh Ltd | Construction | 2022 |
| Phillippa Stephens Limited | Wholesale & retail | 2018 |
| Phillips Elite JET Wash Ltd | Administrative & support | 2025 |
| Phillipspage Associates Limited | Professional & scientific | 2008 |
| Philly's MK Ltd | Hospitality | 2024 |
| Phillyz Smash Ltd | Hospitality | 2025 |
| Philodendron Ltd | Professional & scientific | 2026 |
| PHK2 Trading Ltd | Wholesale & retail | 2014 |
| PHL Solutions Ltd | Construction | 2019 |
| Phoe Lone Limited | Real estate | 2019 |