| Proformance Strength & Conditioning Limited | Wholesale & retail | 2015 |
| Profound Housing and Support Ltd | Health & social care | 2019 |
| Profound Property BIZ Ltd. | Real estate | 2020 |
| Programmatik Ltd | Information & communication | 2010 |
| Programsol Limited | Professional & scientific | 2013 |
| Progressive Strategic Solutions LLP | | 2006 |
| Progressive Wealth LLP | | 2023 |
| Projamtech Ltd | Information & communication | 2026 |
| Project Darwin Bidco Limited | Professional & scientific | 2015 |
| Project Evolve Consultancy LLP | | 2025 |
| Project Outdoors Limited | Construction | 2020 |
| Project Phoenix Social Enterprise C.I.C. | Health & social care | 2025 |
| Project QBC Newco Limited | Information & communication | 2025 |
| Projicere Ltd | Information & communication | 2021 |
| Proleno Limited | Wholesale & retail | 2005 |
| Promanage Ltd | Real estate | 2025 |
| Prometheus Projects (International) Limited | Professional & scientific | 2015 |
| Prompt Genomics Limited | Information & communication | 2024 |
| Prompts Productions Ltd | Professional & scientific | 2026 |
| Prop Maintenance Solutions Ltd | Construction | 2019 |
| Propel Consult Limited | Administrative & support | 2019 |
| Property 61 Limited | Real estate | 2017 |
| Property Axis Limited | Real estate | 2025 |
| Property Creations Cheltenham Limited | Administrative & support | 2013 |
| Property Doctor Cheltenham Ltd | Real estate | 2026 |
| Property FIX (South West) Ltd | Construction | 2026 |
| Property Heat (South West) Limited | Construction | 2026 |
| Property Rental SW Ltd | Real estate | 2025 |
| Property Sales Limited | Construction | 1933 |
| Propulsion Podiatry Limited | Health & social care | 2026 |
| Propulsion Swimming Limited | Information & communication | 2021 |
| Proskin Clinic & Health UK Limited | Health & social care | 2021 |
| Prospect House ST Mary's Management Company Ltd | Households | 2018 |
| Prosperity Care and Wellbeing Group Ltd | Health & social care | 2023 |
| Prosperity Care and Wellbeing Ltd | Health & social care | 2020 |
| Prosperity Serene Properties Ltd | Households | 2024 |
| Protecca Limited | Administrative & support | 2022 |
| Protech International Limited | Financial services | 2019 |
| Protech Machinery Ltd | Manufacturing | 2003 |
| Protect INS Ltd | Financial services | 2015 |
| Protein PAL Ltd | Wholesale & retail | 2024 |
| Protrack Group of Companies Ltd | Information & communication | 2016 |
| Protrack Solutions Limited | Manufacturing | 2013 |
| Provirtue Healthcare Services Ltd | Administrative & support | 2024 |
| Provost International Ltd | Education | 2017 |
| PSC Electrical Services Ltd | Energy | 2019 |
| PSD Building Services Ltd | Construction | 2019 |
| Psgeorge Property Ltd | Real estate | 2022 |
| PSI Cleaning & Maintenance Limited | Administrative & support | 2010 |
| Psjr Markey Investments Co Ltd | Financial services | 2020 |
| Pslearning Ltd | Information & communication | 2017 |
| PSPROPERTIES999 Limited | Real estate | 2017 |
| Psuche Limited | Administrative & support | 2015 |
| Psyblonet Ltd | Information & communication | 2018 |
| PT & PJ Property Management Ltd | Real estate | 2011 |
| PTG Real Estate Ltd | Construction | 2026 |
| Ptisea Ltd | Hospitality | 2026 |
| Ptrs Properties Limited | Extraterritorial | 2013 |
| PU65ELL Ltd | Real estate | 2025 |
| PUD Lets Limited | Real estate | 2025 |
| Puffs & Sips Ltd | Wholesale & retail | 2026 |
| Pulickal Homes Ltd | Real estate | 2022 |
| Pull Court Properties Limited | Real estate | 1962 |
| Pulse Advanced Media Limited | Information & communication | 2013 |
| Pulsford Distribution Ltd | Wholesale & retail | 2023 |
| Pump Supplies Ltd | Wholesale & retail | 1982 |
| Purau Ltd | Administrative & support | 2021 |
| Purba Properties Limited | Real estate | 2024 |
| Pure Beginnings Ltd | Wholesale & retail | 2011 |
| Pure Housing Ltd | Real estate | 2025 |
| Pure Hydro Systems Ltd | Wholesale & retail | 2025 |
| Pure Property Letting Ltd | Real estate | 2025 |
| Pureverify Bio-Ingredient Ltd | Wholesale & retail | 2026 |
| Purple Heart Carpentry & Joinery Limited | Manufacturing | 2022 |
| Purple Home Improvements Ltd | Construction | 2021 |
| Purple Mane Ltd | Extraterritorial | 2025 |
| Purple Possum Limited | Wholesale & retail | 2015 |
| Purpose First Finance Ltd | Education | 2026 |
| PV Assist Limited | Energy | 2014 |
| PVC Connection Ltd | Professional & scientific | 2024 |
| PW Accounting Limited | Professional & scientific | 2025 |
| PWC Distribution Ltd | Wholesale & retail | 2024 |
| PWT Electrical Ltd | Construction | 2017 |
| PYM Electrics Ltd | Construction | 2024 |
| Pyramis U.K. Limited | Wholesale & retail | 1980 |
| Q & Z Itelligence Limited | Professional & scientific | 2013 |
| Q M Valeting Ltd | Administrative & support | 2026 |
| Q&S Limited | Financial services | 2019 |
| Q-Intled Limited | Extraterritorial | 2023 |
| Q-Strides Consulting Limited | Education | 2022 |
| Q-Strides Homes Limited | Real estate | 2022 |
| Q1 Q2 Specialists Limited | Other services | 2015 |
| Qaec Limited | Administrative & support | 2016 |
| QB Capital Ltd | Financial services | 2026 |
| Qdsm Limited | Professional & scientific | 2014 |
| QH Apartments Ltd | Hospitality | 2023 |
| QHP Management Company Limited | Households | 2018 |
| Qing Cables Limited | Manufacturing | 1987 |
| QR Insight Ltd | Professional & scientific | 2022 |
| QRV Limited | Administrative & support | 2013 |