| Prinhold 5 Limited | Real estate | 2014 |
| Prinhold 6 Limited | Real estate | 2014 |
| Prinhold 7 Limited | Real estate | 2015 |
| Prinhold 8 Limited | Real estate | 2015 |
| Prinhold 9 Limited | Real estate | 2017 |
| Prinhold Brixton Limited | Real estate | 2013 |
| Prinhold Limited | Real estate | 2011 |
| Prinhold Woolwich Limited | Real estate | 2013 |
| Prinit Consulting Limited | Information & communication | 2013 |
| Prinnce Hair Style Ltd | Other services | 2019 |
| Print Notch Ltd | Manufacturing | 2026 |
| Print Solve Limited | Professional & scientific | 2021 |
| Printprops Ltd | Manufacturing | 2021 |
| Priority Medical Limited | Health & social care | 2014 |
| Priority Payroll Services Limited | Professional & scientific | 2001 |
| Priority Residences Limited | Real estate | 2021 |
| Priory Grange (Management) Limited | Real estate | 1968 |
| Prisha Enterprise (London) Ltd | Wholesale & retail | 2026 |
| Prisha Patel Consulting, Policy & Strategy Ltd | Professional & scientific | 2024 |
| Prishu Ltd | Professional & scientific | 2016 |
| Prism Power Group Limited | Extraterritorial | 2015 |
| Prism Power Ltd | Manufacturing | 2003 |
| Pristine Home Cleaner Limited | Administrative & support | 2025 |
| Pristine Laser Clinic Ltd | Other services | 2023 |
| Pristine Solutions Cleaning Limited | Administrative & support | 2025 |
| Pritiwellness Limited | Health & social care | 2022 |
| Priva UK Limited | Construction | 2003 |
| Privastate LP | | 2017 |
| Private Domestic and Commercial Renovations Limited | Construction | 2015 |
| Priya Property Ltd | Real estate | 2025 |
| Priyactive Ltd | Wholesale & retail | 2026 |
| Priyansh Engineering Consultancy Limited | Professional & scientific | 2007 |
| Priyas Limited | Real estate | 2008 |
| Prjct Sltn Ltd | Construction | 2023 |
| PRL Polish Deli Ltd | Wholesale & retail | 2018 |
| Pro Buildings Group Limited | Construction | 2020 |
| Pro Cars U.K Ltd | Wholesale & retail | 2023 |
| Pro Finish Decorating Ltd | Construction | 2015 |
| Pro General Constructions Ltd | Construction | 2023 |
| Pro Group Developments Limited | Real estate | 2025 |
| Pro Innovation Limited | Manufacturing | 2017 |
| Pro Specific Inc Limited | Information & communication | 2016 |
| Pro Unite Ltd | Professional & scientific | 2026 |
| Pro Ventilation Systems Ltd | Construction | 2019 |
| Pro-Age Fitness Ltd | Arts & recreation | 2024 |
| Pro-Create London Limited | Professional & scientific | 2016 |
| Pro-Math Limited | Construction | 2022 |
| Proactive GP Ltd | Administrative & support | 2019 |
| Proband Ltd | Information & communication | 2026 |
| Probatexpert Limited | Administrative & support | 2024 |
| Probuildynamics Ltd | Construction | 2025 |
| Probure Ltd | Construction | 2022 |
| Procap Services Limited | Professional & scientific | 2013 |
| Process Agility Limited | Information & communication | 2013 |
| Proconsol Ltd | Administrative & support | 2017 |
| Procureconsult Limited | Professional & scientific | 2022 |
| Procurement Solutions Ltd | Professional & scientific | 2026 |
| Procurepoint Ltd | Construction | 2026 |
| Prodiance Limited | Information & communication | 2015 |
| Prodive Limited | Administrative & support | 2007 |
| Prodomus Ltd | Real estate | 2024 |
| Prodsense Limited | Professional & scientific | 2023 |
| Product Zone Limited | Wholesale & retail | 2009 |
| Production Supplies & Services Limited | Wholesale & retail | 2026 |
| Profair Consultant Limited | Professional & scientific | 2022 |
| Professional Cleaning Ronik Ltd | Administrative & support | 2017 |
| Professional Consultants UK Limited | Administrative & support | 2009 |
| Professional International Probate Researchers Association | Other services | 2021 |
| Profit in Hospitality Limited | Other services | 2013 |
| Profitlux Holding Limited | Financial services | 2017 |
| Progressive Intelligence Solutions Ltd | Information & communication | 2023 |
| Proguarding Security Ltd | Administrative & support | 2022 |
| Prohal Ltd | Professional & scientific | 2018 |
| Project 2 Inspire Ltd | Professional & scientific | 2023 |
| Project 413 Ltd | Information & communication | 2017 |
| Project Elysium Group Holdings Limited | Financial services | 2024 |
| Project EM Consultancy Ltd | Professional & scientific | 2025 |
| Project Finance & Logistics Company Limited | Construction | 2025 |
| Project L Limited | Wholesale & retail | 2015 |
| Project Office Limited | Administrative & support | 1997 |
| Project Rich Ltd | Professional & scientific | 2023 |
| Project Works London Ltd | Manufacturing | 2017 |
| Projector Pictures Limited | Information & communication | 2007 |
| Projectph Ltd | Transport & logistics | 2024 |
| Projects Expert UK Limited | Information & communication | 2021 |
| Projekt Indigo Studio Limited | Wholesale & retail | 2022 |
| Prokey Solutions Ltd | Information & communication | 2015 |
| Prolicence Limited | Education | 2025 |
| Prolific Shimmer Ltd | Financial services | 2021 |
| Proline Motors Ltd | Wholesale & retail | 2021 |
| Prolog Logistics Europe Ltd | Transport & logistics | 2021 |
| Promed Coding Limited | Administrative & support | 2025 |
| Prometeo Ltd | Professional & scientific | 2017 |
| Prompt Recovery Ltd | Transport & logistics | 2025 |
| Promptngo Couriers Ltd | Transport & logistics | 2026 |
| Prompto Consultancy Ltd | Administrative & support | 2015 |
| Pronagem Limited | Real estate | 2023 |
| Proof Logics Ltd | Information & communication | 2026 |
| Prop & Stone Ltd | Real estate | 2021 |
| PROPCORP101 Ltd | Real estate | 2025 |