| PFM Rail Limited | Administrative & support | 2018 |
| Pgrm Holdings Ltd | Professional & scientific | 2015 |
| PGT Limited | Health & social care | 2016 |
| PH Scaffolding Ltd | Construction | 2016 |
| PH3 Investments Limited | Financial services | 2025 |
| PH3 Services Limited | Construction | 2024 |
| Phantom Engine Works Ltd | Wholesale & retail | 2019 |
| Phantom Jewels Limited | Wholesale & retail | 2017 |
| Pharma SM Ltd | Professional & scientific | 2026 |
| Pharmadrome Ltd | Administrative & support | 2012 |
| Phase One Fire Protection Limited | Construction | 2024 |
| Phase One Works Group Limited | Financial services | 2024 |
| Phase One Works Limited | Construction | 2023 |
| Pheilix Technology UK Ltd | Manufacturing | 2025 |
| Phijith Ltd | Hospitality | 2024 |
| Philipa Day Ltd | Wholesale & retail | 2022 |
| Philippe-Reed Holdings Ltd | Administrative & support | 2026 |
| Philippe-Reed Ltd | Real estate | 2025 |
| Philius Limited | Real estate | 1998 |
| Phillip Cotton Limited | Other services | 2020 |
| Phoenix 13 Ltd | Arts & recreation | 2025 |
| Phoenix House Kitchen Ltd | Hospitality | 2025 |
| Phoenix Law Consultancy & Translation Services Ltd | Professional & scientific | 2018 |
| Phoenix Residential Ltd | Real estate | 2025 |
| Phoenix Resourcing Limited | Administrative & support | 2019 |
| Phuk Restaurant Group Limited | Hospitality | 2015 |
| Pickle Music Ltd | Administrative & support | 2018 |
| Pickle POP UK Limited | Wholesale & retail | 2024 |
| Pickled Investments Limited | Administrative & support | 2025 |
| Picnic and Cake Box Company Limited | Wholesale & retail | 2012 |
| Pikari Ltd | Wholesale & retail | 2025 |
| Pillaris Capital Limited | Financial services | 2026 |
| Pilot Foods Limited | Real estate | 1993 |
| Pimes Limited | Administrative & support | 2020 |
| Pine Lodge Residents Association Limited | Households | 1965 |
| Pinery Ltd | Construction | 2018 |
| Pinnacle Civil & Construction Services Limited | Construction | 2005 |
| Pinnacle Fitness and Health Limited | Health & social care | 2016 |
| Pinnacle Fitness and Health Supplements Limited | Arts & recreation | 2024 |
| Pioneer Learning Centre Limited | Education | 2019 |
| Pioneering Emergency Doctors Limited | Health & social care | 2014 |
| Piscine Limited | Extraterritorial | 2001 |
| Pitcher & Crow Ltd | Professional & scientific | 2020 |
| Pixel LX Ltd | Wholesale & retail | 2022 |
| Pixel Pusher Limited | Arts & recreation | 2024 |
| Pixelflakes Ltd. | Administrative & support | 2012 |
| Pixnamic Limited | Other services | 2010 |
| PJH Building Contractors (Essex) Limited | Construction | 2016 |
| PJS Consulting Ltd | Professional & scientific | 2025 |
| PK Grill Ltd | Hospitality | 2022 |
| PKN Interiors Ltd | Construction | 2014 |
| PKO Ventures Ltd | Real estate | 2024 |
| PL Tilers Ltd | Construction | 2016 |
| Place Your Space Limited | Information & communication | 2010 |
| Planet Equity Limited | Real estate | 2018 |
| Planet Positive LAB (Oxford) Limited | Administrative & support | 2023 |
| Planet Pursuits Limited | Administrative & support | 2006 |
| Planetwell Limited | Construction | 2004 |
| Planning & Projects Ltd | Professional & scientific | 2007 |
| Plapop LLP | | 2013 |
| Plate Spinners Limited | Administrative & support | 2025 |
| Plateform Hmida OIL Energy Group Limited | Wholesale & retail | 2024 |
| Platinium Path Services Ltd | Construction | 2026 |
| Platinum Care Appointments Limited | Health & social care | 2002 |
| Plaut Holdings Ltd | Financial services | 2022 |
| Plaut International Limited | Wholesale & retail | 1988 |
| Playerplus Limited | Information & communication | 2019 |
| Playerplus Productions Limited | Information & communication | 2026 |
| Playford Legal Consulting Ltd | Professional & scientific | 2013 |
| Playnice Beauty Ltd | Other services | 2017 |
| Ploutus Investments Limited | Real estate | 2018 |
| Plulo Ltd | Wholesale & retail | 2025 |
| Plumbers Depot Holdings Ltd | Financial services | 2017 |
| Plumbers Depot Limited | Construction | 2011 |
| Plumbrix Services Ltd | Construction | 2026 |
| Plumbtec 2000 Limited | Construction | 2025 |
| Plume Bar and Grill Limited | Hospitality | 2026 |
| PLUS61 Limited | Administrative & support | 2006 |
| PMP Operations Ltd | Wholesale & retail | 2008 |
| Pocket Rent UK Limited | Real estate | 2023 |
| Pocket Renting Holdings Limited | Financial services | 2023 |
| Polyverze Composites UK Ltd | Manufacturing | 2025 |
| Pond Productions Limited | Arts & recreation | 2017 |
| Pontone Ltd | Construction | 2012 |
| Poolehouse Limited | Households | 1998 |
| Popadcorn Ltd | Information & communication | 2021 |
| Popay Limited | Health & social care | 2010 |
| Portbury Wealth Management Limited | Financial services | 2016 |
| Portfolio ID Ltd | Real estate | 2017 |
| Portman Estates & Lettings Ltd | Real estate | 2013 |
| Portman Hospitality Services Ltd | Other services | 2012 |
| Portnalls Properties Limited | Real estate | 2023 |
| Ports and Logistics Consultants Ltd. | Professional & scientific | 2011 |
| Poseidon Aviation Services Ltd | Manufacturing | 2018 |
| Positive Contractors Ltd | Construction | 2011 |
| Positive Lifes Facilitator CIC | Health & social care | 2026 |
| Potential Parenting Ltd | Health & social care | 2016 |
| Potters House Development Services Limited | Administrative & support | 2026 |
| Poundinmypocket Limited | Administrative & support | 2011 |
| Poundmore Limited | Extraterritorial | 1978 |