| Prosperity Estates BM Ltd | Households | 2024 |
| Prosperity Private Wealth Ltd | Professional & scientific | 2014 |
| Prospero Planning Limited | Professional & scientific | 2012 |
| Prospero Property Limited | Real estate | 2012 |
| Prospex Creative Limited | Professional & scientific | 2025 |
| Proteaconsultancyservices Ltd | Professional & scientific | 2017 |
| Protec Electrical and Security Systems Limited | Construction | 2009 |
| Protec Smart Solutions Ltd | Construction | 2021 |
| Protec Team Ltd | Administrative & support | 2024 |
| Protech Support Ltd | Other services | 2024 |
| Protect Commercial Insurance Solutions Limited | Financial services | 2013 |
| Protect OUR Wild Animals Limited | Other services | 2008 |
| Protect With Confidence Ltd | Administrative & support | 2021 |
| Protectyour.Tech Limited | Manufacturing | 2018 |
| Protein Fabric Ltd | Hospitality | 2024 |
| Protein Joy Ltd | Wholesale & retail | 2017 |
| Protekta Life Ltd | Financial services | 2026 |
| Protem Lighting Limited | Construction | 2021 |
| Protempod Limited | Manufacturing | 2024 |
| Protera Ltd | Professional & scientific | 2024 |
| Proterra Holding Ltd. | Financial services | 2016 |
| Proteus AI Limited | Information & communication | 2024 |
| Proteus Digital Ltd | Professional & scientific | 2025 |
| Proteus Global Limited | Wholesale & retail | 2016 |
| Protocase MFG UK Ltd | Information & communication | 2025 |
| Protom Trade PC | | 2020 |
| Protopharma Limited | Administrative & support | 2006 |
| Protospace MFG UK Ltd | Information & communication | 2025 |
| Protoss Consultancy Limited | Households | 2014 |
| Prova Limited | Construction | 2017 |
| Provak Limited | Health & social care | 2020 |
| Provenance Consulting Group Limited | Real estate | 2016 |
| Provenzano Construction Limited | Construction | 2016 |
| Providence Web Services Ltd | Information & communication | 2021 |
| Provider Protect Ltd | Financial services | 2019 |
| Provisionfacilities Ltd | Administrative & support | 2024 |
| Proximaintell Ltd | Administrative & support | 2017 |
| Prozimo Ltd | Manufacturing | 2025 |
| Prrm Healthcare Limited | Health & social care | 2020 |
| Prsnts Global Ltd | Arts & recreation | 2021 |
| Prubka Limited | Manufacturing | 2019 |
| Prudens Management Advisors Inc. | Information & communication | 2020 |
| Prudential Tritec Ltd | Construction | 2020 |
| Prvt Ltd | Other services | 2017 |
| PRW Solutions Ltd | Administrative & support | 2019 |
| Pryd O Dafod (POD) CYF | Professional & scientific | 2025 |
| Prylentor Ltd | Education | 2025 |
| Pryniant Limited | Information & communication | 2015 |
| Pryniantdau Limited | Information & communication | 2019 |
| PS Group Ltd | Information & communication | 2016 |
| PS Lawncare and Ground Maintenance Ltd | Administrative & support | 2025 |
| PS London Construction Project Ltd | Construction | 2018 |
| PS Sltns Limited | Information & communication | 2025 |
| PSA Living Limited | Health & social care | 2021 |
| PSA Scaffolding Ltd | Construction | 2025 |
| Psakma Services Ltd | Wholesale & retail | 2021 |
| Psalms Digital Tech Ltd | Information & communication | 2018 |
| Psarts Limited | Financial services | 2020 |
| PSB Construction Ltd | Construction | 2019 |
| PSC ( 1106 ) Limited | Professional & scientific | 2007 |
| PSC (1168 ) Limited | Professional & scientific | 2007 |
| PSC (1207) Limited | Professional & scientific | 2007 |
| PSC Estates Ltd | Real estate | 2022 |
| PSD Estates Limited | Real estate | 2016 |
| PSD Healthcare Consultancy Ltd | Health & social care | 2017 |
| Pseshu Limited | Information & communication | 2022 |
| Pseve Ltd | Construction | 2025 |
| PSG Audio Visual Ltd | Manufacturing | 2011 |
| PSG Facilities Ltd. | Administrative & support | 1994 |
| PSO Crabby Ltd | Wholesale & retail | 2019 |
| PSP Advisory Limited | Professional & scientific | 2014 |
| PSP48 Ltd | Other services | 2016 |
| Pspice E-Orders Ltd | Hospitality | 2022 |
| Pspp Limited | Hospitality | 2010 |
| PSR Projects Limited | Construction | 2026 |
| Psrc Jewellery Ltd | Manufacturing | 2019 |
| PSS Rail Ltd | Manufacturing | 2019 |
| PSS Recruitment Ltd | Administrative & support | 2017 |
| Psych-Fertility Consulting Limited | Professional & scientific | 2012 |
| Psyche Technology Limited | Information & communication | 2025 |
| Psychologically Ltd. | Professional & scientific | 2017 |
| Psycoders Ltd | Professional & scientific | 2026 |
| PT 2019 ENT Ltd | Administrative & support | 2019 |
| PT Contractor Management Ltd | Other services | 2019 |
| PT Education Services Limited | Information & communication | 2025 |
| PT Martial Arts Limited | Arts & recreation | 2014 |
| PT Removals Ltd | Transport & logistics | 2014 |
| PT Servicesuk Limited | Construction | 2023 |
| PT Smile Ltd | Wholesale & retail | 2025 |
| PT Tutorrs Ltd | Education | 2026 |
| PTA UX Limited | Extraterritorial | 2021 |
| PTG - Top-Co Holding Ltd | Financial services | 2023 |
| PTG Midco Group Holding Ltd | Professional & scientific | 2023 |
| Ptln Project LLP | | 2025 |
| PTS Employment Limited | Administrative & support | 2022 |
| PUB & Plate Group Limited | Transport & logistics | 2022 |
| PUB Co Inns Ltd | Hospitality | 2024 |
| PUB Hub Accountancy Services Limited | Professional & scientific | 2016 |
| Pubguard Ltd | Administrative & support | 2015 |
| Public Child Protection (Pcpw) Ltd | Education | 2025 |