| Pixel Warehouse Limited | Manufacturing | 2019 |
| Pizza on the Square Catering Ltd | Hospitality | 2025 |
| PJ George Midco Ltd | Financial services | 2024 |
| PJ George Topco Ltd | Financial services | 2024 |
| PJA Commercial Limited | Other services | 1990 |
| PJB Hair & Beauty Limited | Other services | 2017 |
| PJG Management Services Ltd | Professional & scientific | 2024 |
| PJM Design Solutions Limited | Professional & scientific | 2005 |
| PJO Plumbing & Heating Limited | Construction | 2023 |
| Pjtm Consulting Ltd | Professional & scientific | 2011 |
| PKB Advisory LLP | | 2024 |
| Plain Code Limited | Information & communication | 2022 |
| Plain Smooth Ltd | Information & communication | 2019 |
| Plan Build Living Limited | Construction | 2013 |
| Plaza Malls Halesowen Limited | Real estate | 2006 |
| Plaza Malls Limited | Real estate | 2009 |
| Plaza Malls Starters Limited | Real estate | 2009 |
| PLH Property Limited | Real estate | 2018 |
| Plml Medical Ltd | Health & social care | 2024 |
| Plusoptic Ltd | Information & communication | 2016 |
| Plutonium Services Limited | Information & communication | 2012 |
| PM Life Sciences Consulting Limited | Professional & scientific | 2025 |
| PML Holdings Limited | Wholesale & retail | 2017 |
| PML2 (Site Services) Limited | Information & communication | 2017 |
| PMO Consultancy Services Limited | Professional & scientific | 2016 |
| PN Group Ltd | Extraterritorial | 2025 |
| Podium Detailing Limited | Wholesale & retail | 2022 |
| Podium Place Ltd | Hospitality | 2020 |
| Polack Business Solutions Ltd | Professional & scientific | 2019 |
| Polar Bear Design Limited | Professional & scientific | 2016 |
| Polgate Limited | Construction | 1982 |
| Polyphemus Ltd | Financial services | 2023 |
| Pomroy & Hine Limited | Real estate | 1962 |
| Pool Cover Systems Ltd | Other services | 2020 |
| Porgies Ltd | Hospitality | 2011 |
| Portridge Capital Limited | Professional & scientific | 2009 |
| Portway Farm Management Company Limited | Real estate | 2016 |
| Positec (UK and Ireland) Limited | Wholesale & retail | 2000 |
| Possabilities Consulting Limited | Health & social care | 2022 |
| Poster Prints Ltd | Wholesale & retail | 2025 |
| Postme Group Ltd | Information & communication | 2018 |
| Pothos Digital Limited | Professional & scientific | 2024 |
| POTS4PLOTS Ltd | Agriculture & fishing | 2022 |
| Potter (Andover) Limited | Administrative & support | 2003 |
| Potter Developments (Andover) Limited | Real estate | 2016 |
| Power Groups Holding Ltd | Financial services | 2026 |
| Power Houses Building Ltd | Real estate | 2026 |
| POWERIT-2-CHANNEL Ltd | Information & communication | 2010 |
| Powersolve Electronics Limited | Manufacturing | 1987 |
| Powis Hughes Limited | Professional & scientific | 2012 |
| PPM 8 Limited | Professional & scientific | 2020 |
| Ppwd Consulting Limited | Professional & scientific | 2011 |
| PR Security Systems Ltd | Administrative & support | 2019 |
| Practicelink Ltd | Health & social care | 2016 |
| Precise Editorial Ltd | Information & communication | 2024 |
| Precision Building Maintenance Limited | Construction | 2008 |
| Precision Cardiovascular Ltd | Manufacturing | 2021 |
| Precision QS Consulting Ltd | Professional & scientific | 2024 |
| Predictoryx Limited | Wholesale & retail | 2026 |
| Preicovoniadtl Ltd | Information & communication | 2025 |
| Premier Developments Southern Limited | Financial services | 2001 |
| Premium Demand Limited | Wholesale & retail | 2025 |
| Presscrane Engineers Ltd. | Manufacturing | 1991 |
| Prestige Leadworks Limited | Construction | 2008 |
| Prestige Network Limited | Professional & scientific | 1989 |
| Pretoria Bookkeeping Limited | Professional & scientific | 2011 |
| Preventus Limited | Information & communication | 2018 |
| Prima Pullets Limited | | 1965 |
| Primaflow Limited | Wholesale & retail | 1991 |
| Prime Perception Limited | Professional & scientific | 2022 |
| Prime Teaser Ltd | Information & communication | 2024 |
| Primefit Windows & Doors Ltd | Construction | 2018 |
| Primelux Care Ltd | Health & social care | 2025 |
| Primor Limited | Construction | 2017 |
| Prince Landscaping Ltd | Administrative & support | 2025 |
| Printronix UK Limited | Administrative & support | 1999 |
| Priory Island Limited | Real estate | 2015 |
| Privani Limited | Wholesale & retail | 2010 |
| Pro-E-Con Limited | Wholesale & retail | 2003 |
| Pro-Tech Kingsclere Ltd | Wholesale & retail | 2012 |
| Proactive Food Solutions Limited | Other services | 2026 |
| Probortunity Ltd | Information & communication | 2012 |
| Process Valve Solutions Ltd | Wholesale & retail | 2003 |
| Processvine Limited | Information & communication | 2015 |
| Procutler Ltd | Wholesale & retail | 2024 |
| Product Focus Ltd | Education | 2006 |
| Product Innovation Consulting Ltd | Professional & scientific | 2024 |
| Professional Coatings Limited | Administrative & support | 2002 |
| Professional Passport Jobs Limited | Administrative & support | 2002 |
| Profold Limited | Manufacturing | 1999 |
| Prognator.Ai Ltd | Information & communication | 2024 |
| Programme Direct Ltd | Information & communication | 2016 |
| Programmemongery Limited | Professional & scientific | 2025 |
| Progress Contract Services Limited | Administrative & support | 2023 |
| Progression Automotive Consulting Limited | Professional & scientific | 2025 |
| Progressive Automotive Ltd | Manufacturing | 2022 |
| Progressive Group (Newbury) Ltd | Financial services | 2017 |
| Progressive Healthcare Services Solutions Limited | Health & social care | 2017 |
| Progressive Investments (Newbury) Ltd | Financial services | 2017 |
| Progressive Technology Advanced Materials Limited | Manufacturing | 2014 |