| Probuild Marine Fabrications UK Limited | Real estate | 2011 |
| Proca Transport Ltd | Transport & logistics | 2015 |
| Procuts Limited | Other services | 2002 |
| Production Scenery Ltd | Information & communication | 2025 |
| Profast Solutions Ltd | Wholesale & retail | 2025 |
| Profbuild Ltd | Construction | 2017 |
| Professional GAS Heating Services Limited | Construction | 1997 |
| Professional NLP Ltd | Education | 2016 |
| Profiscal Experts Limited | Professional & scientific | 2024 |
| Progenuity Ltd | Administrative & support | 2023 |
| Progress Appliances Limited | Extraterritorial | 2024 |
| Progress Teachers Ltd | Administrative & support | 2020 |
| Project 28 Ltd | Construction | 2025 |
| Project Concern (UK) Limited | Administrative & support | 2002 |
| Project Drive Topco Limited | Financial services | 2024 |
| Project Future Ltd | Construction | 2023 |
| Project Management & Consultancy Ltd | Professional & scientific | 2018 |
| Project Q Interco Ltd | Financial services | 2024 |
| Project Q Topco Ltd | Financial services | 2021 |
| Prolific Engineering Ltd | Professional & scientific | 2026 |
| Promain Construction and Interiors Limited | Construction | 2018 |
| Promark Property Limited | Real estate | 2002 |
| Promedicus Limited | Health & social care | 2008 |
| Promedicus Training Solutions Ltd | Education | 2015 |
| Prometheus Technologies UK Ltd | Information & communication | 2008 |
| Promino Limited | Wholesale & retail | 2025 |
| Promise Promo Limited | Wholesale & retail | 2004 |
| Pronto Electrics Limited | Construction | 2019 |
| Propeak Ltd | Construction | 2025 |
| Propertee Developments Ltd | Construction | 2021 |
| Properties With P Ltd | Hospitality | 2024 |
| Property ASC Ltd | Real estate | 2021 |
| Property Champions Ltd | Construction | 2021 |
| Property Champions Management Ltd | Construction | 2025 |
| Property Consultants Limited | Real estate | 2013 |
| Prophetic Property Limited | Real estate | 2025 |
| Proprietary Limited | Real estate | 2024 |
| Proqurebase Ltd | Administrative & support | 2025 |
| Prospectiva Resources Ltd | Mining & quarrying | 2025 |
| Prospero Homes Ltd | Real estate | 2018 |
| Prospira Global Ltd. | Professional & scientific | 2021 |
| Protea Projects Ltd | Administrative & support | 2025 |
| Protean Developments Limited | Real estate | 2010 |
| Protech Recruitment Limited | Administrative & support | 1988 |
| Protech Trustees Limited | Administrative & support | 2022 |
| Protenure Ltd | Wholesale & retail | 2024 |
| Proven Expert Ltd | Information & communication | 2019 |
| Proventus Investments Limited | Households | 2013 |
| Providence GA Limited | Professional & scientific | 2016 |
| Providence Hill Management Limited | Households | 2016 |
| Provident Wealth Financial Limited | Extraterritorial | 2012 |
| Provident Wealth FS Limited | Financial services | 2012 |
| Provident Wealth IFA Limited | Extraterritorial | 2012 |
| Provident Wealth Limited | Extraterritorial | 2010 |
| Provident Wealth Wills Limited | Professional & scientific | 2015 |
| Providere Limited | Financial services | 2009 |
| Prowess Services Ltd | Health & social care | 2023 |
| Proximo Properties Limited | Real estate | 2018 |
| PRP Consulting Services Ltd | Professional & scientific | 2025 |
| PS Design Services Limited | Professional & scientific | 2007 |
| PS Systems Inc Limited | Administrative & support | 2017 |
| PSE Solutions Ltd | Information & communication | 2017 |
| PSG Networks Limited | Information & communication | 2001 |
| Psiquanic Risk Ltd | Professional & scientific | 2026 |
| PT Plumbing (London ) Limited | Construction | 2011 |
| Public Accountants Limited | Education | 2021 |
| Publicworksincorporated Limited | Arts & recreation | 2025 |
| Puddingstone Arts CIC | Arts & recreation | 2025 |
| Puffin Landscapes and Estates Ltd | Administrative & support | 2023 |
| Puller Property Ltd | Real estate | 2022 |
| Punjab Grill and Balti House Limited | Hospitality | 2025 |
| Purcell HP2 Properties Ltd | Real estate | 2025 |
| Purchasing Professionals Recruitment Ltd | Administrative & support | 2007 |
| Purchawise Ltd | Wholesale & retail | 2023 |
| Purdy & Figg Ltd | Manufacturing | 2020 |
| Pure Boric Ltd | Wholesale & retail | 2024 |
| Pure Diamond Ltd | Construction | 2011 |
| Pure Pressure Washing Limited | Administrative & support | 2017 |
| Pure Stainless and Aluminium Fabrications Ltd | Manufacturing | 2025 |
| Pure Visage Ltd | Other services | 2018 |
| Purple Clubs Limited | Arts & recreation | 2013 |
| Purple VM Ltd | Professional & scientific | 2022 |
| Purple VM Properties Ltd | Real estate | 2025 |
| Putter Apparel Limited | Wholesale & retail | 2024 |
| PVL Digital Ltd | Information & communication | 2019 |
| PW Bathrooms Ltd | Construction | 2021 |
| PW Beere Accounting Solutions Limited | Information & communication | 2008 |
| PW Trading Goods Ltd | Wholesale & retail | 2019 |
| PW Travel Ltd | Administrative & support | 2021 |
| Pw&A Ltd | Information & communication | 2018 |
| PWC (UK) Limited | Administrative & support | 2010 |
| PWN Management Services Ltd | Construction | 2017 |
| PXP Joinery Ltd | Manufacturing | 2018 |
| Pycroft Limited | Administrative & support | 2014 |
| Pyrex House Limited | Wholesale & retail | 2025 |
| Q Electrical Services Ltd | Construction | 2016 |
| Q-Insight Group Ltd | Financial services | 2019 |
| Q.C. Correspondence Circle Limited | Other services | 1974 |
| Q.P. Rigging Ltd | Construction | 2022 |
| QAD Gardening Ltd | Administrative & support | 2023 |