| Pro 360 Ltd | Professional & scientific | 2019 |
| Pro Bono Legal Advice Community Interest Company | Professional & scientific | 2026 |
| Pro Chukka Ltd | Arts & recreation | 2020 |
| Pro Dispose UK Limited | Water & waste | 2021 |
| Pro EPC Limited | Professional & scientific | 2021 |
| Pro Guitar Teaching Music School Limited | Education | 2022 |
| Pro Paving (Kent) Limited | Administrative & support | 2017 |
| Pro Paving Drives & Patios Ltd | Administrative & support | 2025 |
| Pro Team Cleaning Ltd | Other services | 2016 |
| Pro-Elec Limited | Construction | 1992 |
| Pro-Paint Plus (U.K) Ltd | Construction | 2018 |
| Pro-Relief Physiotherapy Limited | Health & social care | 2023 |
| Pro-Tech Roofing Solutions Ltd | Construction | 2025 |
| Probite Performance Ltd | Wholesale & retail | 2023 |
| Problem Resolution Limited | Administrative & support | 2010 |
| Probuild Kent Limited | Construction | 2019 |
| Procertify Limited | Professional & scientific | 2026 |
| Processpal Ltd | Administrative & support | 2025 |
| Proclear Solutions Ltd | Transport & logistics | 2024 |
| Proclere Limited | Wholesale & retail | 2000 |
| Procter Investments and Developments Limited | Real estate | 2016 |
| Procurely IT Limited | Information & communication | 2025 |
| Prodelivery Service Limited | Transport & logistics | 2023 |
| Product Imports Limited | Administrative & support | 2002 |
| Productionomics Ltd | Arts & recreation | 2013 |
| Professional Computer Cleaning Limited | Administrative & support | 2002 |
| Professional Electrical Products and Services Limited | Professional & scientific | 2004 |
| Professional Electrical Solutions Limited | Construction | 2006 |
| Professional Engineering Services Limited | Administrative & support | 2016 |
| Professional Training Worldwide Limited | Professional & scientific | 1997 |
| Proficient Parents Limited | Health & social care | 2012 |
| Progen Pharma Ltd | Construction | 2019 |
| Progradex Limited | Manufacturing | 2011 |
| Progress Properties Management Limited | Construction | 2026 |
| Project Ambient CIC | Professional & scientific | 2024 |
| Project Cornmill Limited | Hospitality | 2025 |
| Project Nova Capital Limited | Professional & scientific | 2022 |
| Project Salus C.I.C. | Education | 2010 |
| Project Scaffold Limited | Construction | 2025 |
| Project Talent Partners Ltd | Professional & scientific | 2025 |
| Projectide Limited | Information & communication | 2023 |
| Projektus Limited | Information & communication | 2014 |
| Prolux Roofing Ltd | Construction | 2022 |
| Promise Sports Education & Teaching Enterprise Ltd | Education | 2023 |
| Property Ashford Ltd | Information & communication | 2019 |
| Property DMR Services Ltd. | Construction | 2016 |
| Property Pays Limited | Construction | 2016 |
| Property Pitstop Building & Maint Co Ltd | Construction | 2023 |
| Property Service LDN Limited | Real estate | 2021 |
| Property Solutions Wise Ltd | Real estate | 2025 |
| Property Wealth Associates Ltd | Real estate | 2020 |
| Property Wealth Capital Ltd | Real estate | 2019 |
| Property Wealth Corporation Limited | Construction | 2021 |
| Property Wealth Estate Ltd | Real estate | 2017 |
| Prophetts Soft Drinks Limited | Wholesale & retail | 2001 |
| Proprietas Property Management Ltd | Real estate | 2008 |
| Props RS Limited | Information & communication | 2013 |
| Prospa Property Group Ltd | Construction | 2024 |
| Prospect Farm Developments Limited | Real estate | 2018 |
| Prospect Films Limited | Information & communication | 2025 |
| Prospect Tree Mortgages Ltd | Professional & scientific | 2016 |
| Prospera Prime Properties Ltd | Real estate | 2024 |
| Prospera Rita Health Limited | Health & social care | 2025 |
| Protech Roofing & Guttering Ltd | Construction | 2026 |
| Proteus Building Services Limited | Construction | 2020 |
| Protokol UK Ltd | Administrative & support | 2010 |
| Protruck Limited | Professional & scientific | 2002 |
| Provide Recruitment Ltd | Administrative & support | 2024 |
| Provident Union Limited | Real estate | 2011 |
| Provincial Residential Holdings Limited | Financial services | 1936 |
| Prudent Potato Ltd | Arts & recreation | 2013 |
| PS Autoparts Ltd | Wholesale & retail | 2015 |
| PS Educate Limited | Education | 2019 |
| PS Sports Coaching Limited | Arts & recreation | 2018 |
| PSB Recruitment Limited | Professional & scientific | 1997 |
| PSB Transport Services Limited | | 1985 |
| Psdl Services Limited | Professional & scientific | 2024 |
| Psimple Ltd | Information & communication | 2025 |
| PSK Building Surveyors Limited | Other services | 1990 |
| PSR Lighting and Signs Limited | Construction | 2010 |
| PT Southern Services Ltd | Health & social care | 2015 |
| Ptmv Services Ltd | Health & social care | 2018 |
| Ptolemy Dean Architects Limited | Professional & scientific | 2005 |
| Puara Ltd | Real estate | 2023 |
| Public Sculpture Limited | Arts & recreation | 2015 |
| Publicstar Control Engineering Limited | Manufacturing | 2002 |
| Publicstar Solutions Limited | Manufacturing | 2011 |
| Puglet Digital Ltd | Professional & scientific | 2018 |
| Pula Ltd | Real estate | 2019 |
| Pullinger Construction Ltd | Manufacturing | 2021 |
| Pullinger Signs Limited | Administrative & support | 2009 |
| Pullman Lounge Weybridge Limited | Hospitality | 2018 |
| Pulse.Io Ltd | Information & communication | 2020 |
| PUN Estates Ltd | Real estate | 2024 |
| Punjab Hauliers Limited | Transport & logistics | 2024 |
| Purdys Financial Services Limited | Financial services | 2024 |
| Purdys Property Services Limited | Real estate | 2024 |
| Pure Burn Limited | Construction | 2011 |
| Pure LET Greenwich Limited | Real estate | 2016 |
| Pure Prestige Vehicles Ltd | Transport & logistics | 2023 |