| Pharma QP Services Ltd | Professional & scientific | 2023 |
| Pharmacryst Consulting Limited | Professional & scientific | 2012 |
| Pharmatx Consulting Limited | Professional & scientific | 2025 |
| Phasic Ltd | Professional & scientific | 2012 |
| Phencing Systems Limited | Manufacturing | 2001 |
| Pheonix Management Ltd | Professional & scientific | 2008 |
| PHF Land and Property Services Limited | Agriculture & fishing | 2015 |
| Phil Abraham Limited | Wholesale & retail | 2024 |
| Philip Creasey Limited | Construction | 2008 |
| Philip Laing Ltd | Real estate | 2002 |
| Philip Rose Consulting Limited | Administrative & support | 2018 |
| Philish Holdings Ltd | Real estate | 2023 |
| Phillys Melts Ltd | Wholesale & retail | 2025 |
| Phirefly Ltd | Arts & recreation | 2010 |
| Phoenix Curtain Makers Limited | Manufacturing | 2003 |
| Phoenix Health and Wellness Ltd | Health & social care | 2023 |
| Phoenix Hydraulic & Electrical Services Limited | Manufacturing | 1981 |
| Phoenix Properties Inc. Ltd | Real estate | 2022 |
| Phoenix Sports & Events Limited | Education | 2023 |
| Phoenix Vets Ltd | Professional & scientific | 2023 |
| Phones for ME Repair Centre Ltd | Wholesale & retail | 2023 |
| Phormular Limited | Professional & scientific | 2010 |
| PHW (EM) Limited | Manufacturing | 2022 |
| PHX JAM Limited | Information & communication | 2026 |
| Piab Limited | Wholesale & retail | 1999 |
| Picklebase CIC | Arts & recreation | 2025 |
| Pickuls Gizmo Ltd | Other services | 2020 |
| Pickworth & SON Limited | Wholesale & retail | 1959 |
| Pickworth Holdings Limited | Financial services | 2021 |
| Piercings by Wheeler Ltd | Other services | 2026 |
| Pigeon Publications Limited | Information & communication | 1998 |
| Pignorant Ltd | Information & communication | 2022 |
| Pillings Lock Marina Ltd | Arts & recreation | 2006 |
| Pimenta Consulting Ltd | Professional & scientific | 2017 |
| Pinehouse Limited | Real estate | 1986 |
| Pinfold Developments Limited | Professional & scientific | 2006 |
| Pink Berries Desserts Ltd | Hospitality | 2021 |
| Pink Fringe Tango Fashion Limited | Wholesale & retail | 2024 |
| Pinnacle IMP Limited | Professional & scientific | 2010 |
| Pioneer Trust | Other services | 2006 |
| Piota Apps Ltd | Information & communication | 2024 |
| Pips Land Holdco Limited | Professional & scientific | 2023 |
| Pips Land Newco Limited | Professional & scientific | 2023 |
| Piratella Hm-Rpa Limited | Financial services | 2025 |
| Piskmear Limited | Professional & scientific | 2017 |
| Piton Trading Strategies Limited | Financial services | 2025 |
| Pitp Consulting Ltd. | Professional & scientific | 2019 |
| Pixelated Monkey Limited | Information & communication | 2024 |
| Pixels & Noise Limited | Information & communication | 2016 |
| Pixie Lott Paint Limited | Wholesale & retail | 2017 |
| Pizza MIA MIA Limited | Hospitality | 2025 |
| Pizza on Fire Ltd | Hospitality | 2025 |
| Pizzarairai Ltd | Hospitality | 2024 |
| PJ Atoc Services Ltd | Information & communication | 2023 |
| PJB Tutors Limited | Education | 2013 |
| PJC Audio Ltd | Professional & scientific | 2011 |
| PJG Creations Limited | Information & communication | 2013 |
| PJM & MJE Investments Ltd | Financial services | 2019 |
| Pjms Solutions Limited | Professional & scientific | 2024 |
| PJN Testing Ltd | Professional & scientific | 2020 |
| PK Technics (Loughborough) Limited | Other services | 2022 |
| Pkpmakar Ltd | Transport & logistics | 2026 |
| Plan 99 Ltd | Real estate | 2019 |
| Plan Burrito Ashby Road Ltd | Hospitality | 2017 |
| Plan Franchise Ltd | Administrative & support | 2017 |
| Plan Lincoln Ltd | Hospitality | 2024 |
| Plant Tape UK Limited | Wholesale & retail | 2018 |
| Plateau (Loughborough) Limited | Professional & scientific | 1926 |
| Platinum Line Limited | Health & social care | 2022 |
| Platinum Strategies Limited | Financial services | 2009 |
| Platts Holdings Limited | Professional & scientific | 2004 |
| Pleb Curriers Ltd | Manufacturing | 2023 |
| Plug Interiors Limited | Wholesale & retail | 2011 |
| Plumb Medics 247 Ltd | Construction | 2025 |
| Plumbing in 30 MIN Ltd | Construction | 2026 |
| Plumecast Limited | Manufacturing | 1987 |
| Plumtree Theatre Ltd | Arts & recreation | 2022 |
| Plural People Solutions Limited | Administrative & support | 2025 |
| Plutus Innovations Ltd | Financial services | 2012 |
| PMG Electrical Services Ltd | Construction | 2020 |
| PN Store Limited | Wholesale & retail | 2018 |
| Pockets Sports Bar Ltd | Arts & recreation | 2025 |
| POD Solutions Ltd | Construction | 2025 |
| Pogo Energy Systems Ltd | Construction | 2021 |
| Poison Gardens Ltd | Arts & recreation | 2025 |
| Pokevest Limited | Wholesale & retail | 2025 |
| POL Investments Limited | Real estate | 2022 |
| Polar North Collective Ltd | Professional & scientific | 2026 |
| Polebrook Estates Limited | Construction | 1987 |
| Polsmile Limited | Health & social care | 2009 |
| Polybron Plastics Limited | Manufacturing | 1981 |
| Polycopy Holdings Ltd | Financial services | 2019 |
| Polycopy Ltd | Wholesale & retail | 2019 |
| Polymer Traders Ltd | Wholesale & retail | 2023 |
| Polyphonic Youth Community Interest Company | Education | 2025 |
| Pony Magic Limited | Education | 2023 |
| Pooch Palace VIP Ltd | Other services | 2019 |
| Poolooo Ltd | Manufacturing | 2025 |
| POP Goes the Party Ltd | Arts & recreation | 2025 |
| Popa Telecom Services Ltd | Information & communication | 2024 |