| Proclivity WP Ltd | Information & communication | 2018 |
| Procurement Monkey Limited | Other services | 2008 |
| Product Chain (Services) Limited | Wholesale & retail | 1995 |
| Productive People LLP | | 2013 |
| Products for Business Limited | Administrative & support | 2000 |
| Productset Limited | Wholesale & retail | 2023 |
| Professional Copywriters' Network Ltd | Other services | 2010 |
| Profile Hair & Skin Care Limited | Wholesale & retail | 2011 |
| Profit Earth Ltd | Professional & scientific | 2026 |
| Profit IMI Accounting Office Ltd | Professional & scientific | 2019 |
| Profit Proficy Ltd | Administrative & support | 2019 |
| PROFIT9X Limited | Wholesale & retail | 2025 |
| Profitsevolution.Co.Uk Limited | Professional & scientific | 2003 |
| Profserv Limited | Administrative & support | 2009 |
| Progen Aesthetics Limited | Health & social care | 2023 |
| Proggect Limited | Professional & scientific | 2017 |
| Proglide Aluminium Limited | Manufacturing | 2024 |
| Programming With Olly Ltd | Information & communication | 2024 |
| Proinvestco Ltd | Real estate | 2024 |
| PROJ35T Ltd | Wholesale & retail | 2025 |
| Project 441 Limited | Professional & scientific | 2012 |
| Project AIA Limited | Professional & scientific | 2019 |
| Project Financials Limited | Professional & scientific | 2019 |
| Project Innovation and Excellence (P.I.E) Limited | Professional & scientific | 2023 |
| Project Padel Bidco Limited | Financial services | 2025 |
| Project Padel Midco Limited | Financial services | 2025 |
| Project Padel Topco Limited | Financial services | 2025 |
| Project Scaffolding (South) Ltd | Construction | 2023 |
| Project Services Hub Ltd | Information & communication | 2025 |
| Project Spray Render Ltd | Construction | 2012 |
| Projectly Limited | Administrative & support | 2024 |
| Projectmatrix Limited | Professional & scientific | 2022 |
| Projects-Pro Ltd | Real estate | 2012 |
| Projects-Pro Venture Ltd | Real estate | 2020 |
| Projectwireduk CIC | Health & social care | 2018 |
| Prolec Limited | Manufacturing | 1982 |
| Promised Land (South) Ltd | Real estate | 2024 |
| Promisingabode Ltd | Other services | 2025 |
| Promo Delivery Ltd | Information & communication | 2026 |
| Promotion&Scale Limited | Wholesale & retail | 2025 |
| Pronto Italia Limited | Hospitality | 2008 |
| Prop Options Ltd | Wholesale & retail | 2021 |
| Propeller Media Management Ltd | Information & communication | 2005 |
| Proper Enclosure Solutions Ltd | Manufacturing | 2009 |
| Proper Mortgages Limited | Financial services | 2025 |
| Propero Consultancy Ltd | Information & communication | 2026 |
| Propertee Associates Limited | Hospitality | 2018 |
| Properties on Point Limited | Real estate | 2025 |
| Properties Select Limited | Professional & scientific | 2001 |
| Property Events Global Ltd | Real estate | 2018 |
| Property Finance HQ Ltd | Financial services | 2025 |
| Property Lottery Ltd | Extraterritorial | 2019 |
| Property Lynx Limited | Real estate | 2011 |
| Property Management Services (Kent) Limited | Households | 2020 |
| Property Office Ltd | Information & communication | 2006 |
| Property Photography Group Ltd | Professional & scientific | 2025 |
| Property Sharks Ltd | Real estate | 2025 |
| Propertywide Consultancy Limited | Administrative & support | 2021 |
| Propex Consulting Ltd | Professional & scientific | 2023 |
| Propmatch Ltd | Real estate | 2025 |
| Proprium DEI Ltd | Real estate | 2018 |
| Props Away Limited | Transport & logistics | 2015 |
| Proptam Limited | Real estate | 2016 |
| Proptimise Ltd | Information & communication | 2018 |
| Prospect Interiors South Ltd | Construction | 2018 |
| Prospective Configuration Ltd | Information & communication | 2025 |
| Prosperous Properties Limited | Real estate | 2025 |
| Prosperra Group Limited | Wholesale & retail | 2025 |
| Prossible Ltd | Health & social care | 2024 |
| Prostar Property Services Ltd | Construction | 2024 |
| Prosurvey Apps Limited | Information & communication | 2026 |
| Protea Venture Limited | Real estate | 2023 |
| Protect Against Group Ltd | Information & communication | 2025 |
| Protect Line Ltd | Financial services | 2009 |
| Protect Your Server Ltd | Information & communication | 2018 |
| Protection Wall Ltd | Information & communication | 2018 |
| Protective Limited | Financial services | 2021 |
| Protonomy Software Ltd | Information & communication | 2009 |
| Provenance Holdings Ltd | Construction | 2019 |
| Prowting 1968 Trustee One Limited | Financial services | 2013 |
| Prowting 1968 Trustee Two Limited | Financial services | 2013 |
| Prowting 1987 Trustee One Limited | Financial services | 2013 |
| Prowting 1987 Trustee Two Limited | Financial services | 2013 |
| Prowting Group Ltd | Construction | 1987 |
| PRS Legal Services Ltd | Professional & scientific | 2013 |
| Prymal Mojo Limited | Wholesale & retail | 2021 |
| Pryme Homes Limited | Real estate | 2017 |
| Pseps Limited | Information & communication | 2001 |
| PSH Investments Limited | Real estate | 2021 |
| PSH Taxation and Accountancy Limited | Professional & scientific | 2019 |
| Pssl Consulting Limited | Professional & scientific | 2023 |
| Psychological Therapies Dorset Ltd | Health & social care | 2026 |
| Psychotherapy With Maya Ltd | Health & social care | 2025 |
| Psylewis Ltd | Health & social care | 2021 |
| Psysys Limited | Professional & scientific | 2023 |
| PT Potts Limited | Arts & recreation | 2025 |
| PT2 Consulting Ltd | Professional & scientific | 2022 |
| Ptcl Care Services Limited | Other services | 2023 |
| PTP Assets Ltd | Other services | 2021 |
| PTP Body Repairs Ltd | Wholesale & retail | 2013 |