| PHI Strategy Ltd | Administrative & support | 2015 |
| Philip M Russell Limited | Information & communication | 2011 |
| Philip Owen Accountancy Services Ltd | Professional & scientific | 2021 |
| Philip Reeve Consulting Limited | Information & communication | 2023 |
| Philpots Farm Management Company (NO.2) Limited | Households | 1983 |
| Phiri & Phiri Associates Limited | Professional & scientific | 2014 |
| Phnx Professional Services Limited | Professional & scientific | 2024 |
| Phoenix Family Solutions Ltd | Financial services | 2021 |
| Phoenix HBM Ltd | Real estate | 2019 |
| Phoenix Hotel Partners Limited | Professional & scientific | 2025 |
| Phoenix Lakes Ltd | Financial services | 2024 |
| Phoenix Park (Thame) Management Company Limited | Households | 2022 |
| Phoenix Property Service Ltd | Administrative & support | 2012 |
| Phone AR Assessories Limited | Wholesale & retail | 2024 |
| Phos Education Limited | Education | 2009 |
| Phvassist Ltd | Financial services | 2019 |
| Phygen.Io Ltd | Professional & scientific | 2024 |
| Phygitaltwin Ltd | Professional & scientific | 2022 |
| Physical Finesse Ltd | Health & social care | 2022 |
| Piba Limited | Professional & scientific | 2023 |
| Picaroons Limited | Information & communication | 2017 |
| Piccadilly Greetings Group Limited | Manufacturing | 1990 |
| PICTURE2SOUND Ltd | Construction | 2024 |
| Pieflow Limited | Information & communication | 2025 |
| Piher International Limited | Extraterritorial | 1971 |
| Pilates With Jenna Ltd | Other services | 2024 |
| Piling Specialists Ltd | Construction | 2020 |
| Pine and Cedar Management Company at Westley Green Limited | Households | 2022 |
| Pinedart Limited | Information & communication | 1984 |
| Pinelands Media Ltd | Information & communication | 2019 |
| Pingostar Limited | Professional & scientific | 2018 |
| Pink Lotus Properties Ltd | Households | 2025 |
| Pink Pilates Hemel Ltd | Arts & recreation | 2025 |
| Pinkham Blair Limited | Extraterritorial | 2004 |
| Pinnacle 12 Limited | Information & communication | 2025 |
| Pinnacle(Merton Rise) Management Company Limited | Households | 2007 |
| Pipedin Limited | Other services | 2008 |
| Pipestone Properties Limited | Real estate | 2007 |
| Pipits Residents Limited | Households | 2014 |
| Pipsqueak Limited | Professional & scientific | 2019 |
| Piranha Services Limited | Wholesale & retail | 2025 |
| Piscianaqua Ltd | Manufacturing | 2013 |
| Pitarka Plumbing Ltd | Construction | 2022 |
| Pitsboj Limited | Wholesale & retail | 2020 |
| PIX Farm Limited | Agriculture & fishing | 2010 |
| Pixel Pathos Ltd | Information & communication | 2014 |
| Pizan Limited | Hospitality | 2025 |
| PJ Curran & Sons Properties Limited | Real estate | 2020 |
| PJ Owen and SON Ltd | Wholesale & retail | 2022 |
| PJK Plant Ltd | Construction | 2008 |
| PK Decor Services Ltd | Construction | 2025 |
| PK Futures Limited | Financial services | 2025 |
| PK Health Solutions Ltd | Health & social care | 2024 |
| Pkcom Ltd | Administrative & support | 2026 |
| Plan D Media Limited | Professional & scientific | 2024 |
| Planet Alpine Ltd | Arts & recreation | 2018 |
| Planning and Regeneration Limited | Administrative & support | 1997 |
| Plant Rescue Ltd | Agriculture & fishing | 2025 |
| Plas Y Coed Management Company Limited | Real estate | 2017 |
| Plasma Music Limited | Manufacturing | 1999 |
| Plastering & Maintenance Solutions Ltd | Construction | 2025 |
| Plate Recruitment Ltd | Administrative & support | 2021 |
| PLATE360 Ltd | Wholesale & retail | 2024 |
| Platinum Care United Ltd | Administrative & support | 2021 |
| Platinum Pulse Network Ltd | Professional & scientific | 2026 |
| Playerforge Ltd | Information & communication | 2023 |
| Players Prep Ltd | Education | 2022 |
| Players Register Court Sports Limited | Other services | 2005 |
| Players Register Cricket Limited | Other services | 2005 |
| Players Register Football Limited | Other services | 2005 |
| Players Register Gaelic Sports Limited | Other services | 2005 |
| Players Register Hockey Limited | Other services | 2005 |
| Players Register Ltd | Other services | 2004 |
| Players Register Multisports Limited | Other services | 2005 |
| Players Register Rugby Limited | Other services | 2005 |
| Pleasant @ Property’S Ltd | Real estate | 2024 |
| Plumb Heating Ltd | Construction | 2017 |
| PLUMB2U Plumbing & Heating Supplies Ltd | Construction | 2013 |
| Plumbalb Plumbers Ltd | Construction | 2016 |
| Plumbalb Properties Ltd | Real estate | 2020 |
| Plumbline Building Services Limited | Construction | 2009 |
| Plus Construction Ltd | Construction | 2018 |
| Plutus Tyche Limited | Real estate | 2024 |
| PLY Pro Supplies Ltd | Wholesale & retail | 2025 |
| PMC Logistics and Recycling Ltd | Construction | 2009 |
| PMG Associates Limited | Administrative & support | 2013 |
| PMK Autos Limited | Wholesale & retail | 2019 |
| PMS Managing Estates Ltd | Real estate | 2016 |
| PMT Guntrading Ltd | Manufacturing | 2026 |
| PMT Services Ltd | Administrative & support | 2021 |
| Pneumatic Services Limited | Professional & scientific | 2018 |
| Pojar Ltd | Wholesale & retail | 2018 |
| Pokedad UK Ltd | Wholesale & retail | 2025 |
| POL Commercial Services Ltd | Wholesale & retail | 2020 |
| POL Heavy Haulage Ltd | Transport & logistics | 2001 |
| Polar Engineering Limited | Manufacturing | 2010 |
| Polaris Enterprises Ltd | Financial services | 2007 |
| Pollen Planting Design Ltd | Wholesale & retail | 2026 |
| Polperro Way Ltd | Real estate | 2022 |
| Polyma Ltd | Manufacturing | 2023 |