| Proctor Specialist Cars Limited | Professional & scientific | 2004 |
| Proctors Landscapes Limited | Administrative & support | 2022 |
| Procurement Skills Limited | Professional & scientific | 2010 |
| Product Development Group Limited | Professional & scientific | 2020 |
| Profabweldingservices Ltd | Manufacturing | 2025 |
| Profac Ltd | Construction | 2018 |
| Professional Association of Assistive Technologists CIC | Other services | 2025 |
| Professional Cleaning Services (UK) Limited | Administrative & support | 2002 |
| Professional Retail Services Limited | Real estate | 2001 |
| Professional Safety Training Solutions Ltd | Other services | 2019 |
| Profileads Limited | Administrative & support | 2025 |
| Profix Masonry Limited | Construction | 2008 |
| Progear Limited | Wholesale & retail | 2023 |
| Progress Properties (Nottingham) Ltd | Real estate | 2024 |
| PROGRESS4CARE Limited | Health & social care | 2024 |
| Progression Accountancy Ltd | Administrative & support | 2015 |
| Progressive Website Development Ltd | Information & communication | 2011 |
| Project Facilities Ltd | Real estate | 2026 |
| Project Origin Bidco Limited | Financial services | 2023 |
| Project Origin Midco Limited | Financial services | 2023 |
| Project Origin Nominee Limited | Financial services | 2023 |
| Project Origin Topco Limited | Financial services | 2023 |
| Project Terrier LLP | | 2018 |
| PROJECT75 Software Limited | Information & communication | 2011 |
| Project: Drive Events Ltd | Administrative & support | 2019 |
| Prolec Services (UK) Ltd | Construction | 2009 |
| Proline Construction Maintenance and Repair Ltd | Construction | 2020 |
| Prolog Trustees Limited | Administrative & support | 1995 |
| Prometheus Heating Ltd | Construction | 2023 |
| Proper Platforms Limited | Information & communication | 2026 |
| Property Documents Ltd | Information & communication | 2024 |
| Property Engineering and Construction Limited | Real estate | 2011 |
| Property Group 3 Ltd | Real estate | 2024 |
| Property Marketplace UK Ltd | Information & communication | 2024 |
| Property Millionaire Network Ltd | Professional & scientific | 2023 |
| Property Sale Pack Limited | Real estate | 1999 |
| Prophile Limited | Information & communication | 1995 |
| Propserve UK Limited | Real estate | 2008 |
| Propsychology Limited | Health & social care | 2018 |
| Prosec Group Limited | Administrative & support | 2017 |
| Proserve Heating Ltd | Construction | 2025 |
| Prosounds Audio Ltd | Manufacturing | 2014 |
| Prospect Alliance Ltd | Financial services | 2023 |
| Prospect MOT Centre Limited | Wholesale & retail | 2021 |
| Prosper Ventura Ltd | Wholesale & retail | 2025 |
| Protec ERP Limited | Information & communication | 2022 |
| Protecta Pest Control Ltd | Professional & scientific | 2025 |
| Protecting Wealth Ltd | Financial services | 2014 |
| Protemp Recruitment Limited | Administrative & support | 1988 |
| Proteus Fittings Limited | Wholesale & retail | 1994 |
| Providence House Developments Limited | Construction | 2015 |
| Proviso Holdings Limited | Financial services | 2020 |
| Proviso Property Holdings Ltd | Real estate | 2022 |
| PS Mechanical Engineering Ltd | Professional & scientific | 2026 |
| Psaams Limited | Professional & scientific | 2007 |
| PSG Maintenance Ltd. | Administrative & support | 2025 |
| PSJ Marine Services Ltd | Professional & scientific | 2017 |
| PST Investments Limited | Real estate | 2018 |
| Psttp Holdings Limited | Financial services | 2025 |
| Ptcs Group Limited | Administrative & support | 2025 |
| PTF Property Rentals Limited | Real estate | 2025 |
| PTS Construction Limited | Construction | 2007 |
| PTS Developments Limited | Construction | 2016 |
| PTS Estates Limited | Financial services | 2016 |
| Pubbot Ltd | Information & communication | 2019 |
| Public Sector Consultants Limited | Professional & scientific | 2000 |
| Pudding Patrol Ltd | Hospitality | 2025 |
| Pugsley 1962 Limited | Extraterritorial | 2013 |
| Pulchra Homes Ltd | Construction | 2020 |
| Pump and Go Ltd | Construction | 2022 |
| Pump and Tank Services Limited | Construction | 2002 |
| Purbeck Village Management Company Limited | Households | 2020 |
| Pure Hoard Ltd | Extraterritorial | 2024 |
| Pure Imports Limited | Administrative & support | 2009 |
| Pure Party Ltd | Wholesale & retail | 2013 |
| Pure Radiance Aesthetics Limited | Other services | 2025 |
| Pure Solutions Group Ltd | Other services | 2015 |
| Pureshrimp Ltd | Wholesale & retail | 2026 |
| Purple FOX Plumbing Ltd | Construction | 2022 |
| Purple Planning and Design Ltd | Professional & scientific | 2014 |
| Purple Rhubarb Limited | Information & communication | 2019 |
| Purple Wealth Ltd | Financial services | 2020 |
| Puzzling Online Limited | Information & communication | 2021 |
| PVG Health & Wellbeing Limited | Health & social care | 2025 |
| PW Tyres Limited | Wholesale & retail | 2008 |
| PWS Weld Ltd | Construction | 2015 |
| PXN Inspections Limited | Professional & scientific | 2012 |
| Pywell & SON Limited | Construction | 2025 |
| Q C Electrical Holdings Limited | Financial services | 2021 |
| Q C Electrical Limited | Construction | 2003 |
| Q C Shopfitters Limited | Construction | 2022 |
| Q Ortho Ltd | Professional & scientific | 2025 |
| Q-Mv Ltd | Wholesale & retail | 2017 |
| QB3 Solutions Ltd | Professional & scientific | 2025 |
| QBM Consulting Limited | Information & communication | 2014 |
| QC Finance Ltd | Wholesale & retail | 2025 |
| QC Prestige Ltd | Wholesale & retail | 2022 |
| Qnns Limited | Other services | 2017 |
| QTG Ltd. | Information & communication | 1998 |
| Quad Warehouse Assets Ltd | Transport & logistics | 2022 |