| Prideconnect UK Limited | Health & social care | 2025 |
| Priestfields Management Company Limited | Households | 2011 |
| Primarily Diagnostic Ltd | Education | 2015 |
| Primary Care Supplies Group Limited | Extraterritorial | 2013 |
| Primary Care Supplies Ltd | Extraterritorial | 2013 |
| Prime Carwash Ltd | Other services | 2020 |
| Prime-Ace Consultancy Limited | Information & communication | 2020 |
| PRIME56 Consulting Ltd | Information & communication | 2024 |
| Primo Padel Club Ltd | Arts & recreation | 2025 |
| Primrose Community Healthcare Limited | Health & social care | 2023 |
| Primrose Healthcare Consulting Limited | Professional & scientific | 2023 |
| Primrose Industries Limited | Wholesale & retail | 2024 |
| PRINT17 Ltd | Wholesale & retail | 2024 |
| Priority Bracknell Ltd | Arts & recreation | 2025 |
| Priority Dereham Ltd | Arts & recreation | 2026 |
| Priority Fitness Fleet Ltd | Arts & recreation | 2025 |
| Priority Fitness Limited | Arts & recreation | 2015 |
| Priority Services (Kent) Limited | Construction | 2013 |
| Prism Investments Limited | Financial services | 2018 |
| Prison Outreach Network Limited | Health & social care | 2019 |
| Private Sale Caravans Ltd | Wholesale & retail | 2018 |
| Priyaa Limited | Real estate | 2024 |
| Pro Build Services Ltd | Construction | 2019 |
| Pro-Actif Sports Management Limited | Education | 2017 |
| Problock Security Limited | Administrative & support | 2019 |
| Procter & Holden Ltd | Real estate | 2017 |
| Proctors Transport Limited | Transport & logistics | 2006 |
| Profectus Nostri Limited | Real estate | 2016 |
| Professional Advanced Lessons Ltd | Education | 2025 |
| Professional Trust Group Limited | Professional & scientific | 2011 |
| Professional Workforce Management Group Ltd | Manufacturing | 2025 |
| Professor Slime Ltd | Arts & recreation | 2026 |
| Profix Home Solutions Ltd | Construction | 2026 |
| Proflo Plumbing & Drainage Ltd | Water & waste | 2019 |
| Progress (2007) Limited | Construction | 2007 |
| Progress Furnishings Systems Limited | Administrative & support | 1996 |
| Progresssurge Ltd | Information & communication | 2026 |
| Prohibition Coffee Company Limited | Manufacturing | 2020 |
| Prohire Software Limited | Information & communication | 1995 |
| Project Flooring (UK) Limited | Administrative & support | 2004 |
| Proline Braided Lines Ltd | Manufacturing | 2019 |
| Promikefitness Ltd | Financial services | 2025 |
| Promotions Essex UK Ltd | Other services | 2021 |
| Propco Seaview Terrace Limited | Real estate | 2016 |
| Proper Opera Limited | Arts & recreation | 2018 |
| Properdan Limited | Financial services | 2025 |
| Propertin Limited | Real estate | 2019 |
| Property 11 Ltd | Real estate | 2023 |
| Property Investments and Acquisitions Limited | Real estate | 2016 |
| Property Investors London Limited | Real estate | 2012 |
| Property Investors London Partnership LLP | | 2023 |
| Proshield Safety Group Ltd | Professional & scientific | 2025 |
| Prost Properties Ltd | Real estate | 2017 |
| Prostage Ltd | Other services | 2017 |
| Protean Medical and Analytical Solutions Ltd | Health & social care | 2013 |
| Prowin Services Limited | Administrative & support | 2025 |
| Prudent Business Group Limited | Education | 2018 |
| Prudent Domiciliary Care Limited | Health & social care | 2018 |
| PSC Site Services Ltd | Extraterritorial | 2024 |
| Pscs Property Limited | Other services | 2020 |
| PSG Lifting and Rigging Solutions Ltd | Construction | 2026 |
| PSR Accountants Limited | Professional & scientific | 2025 |
| PSS Care Group Limited | Health & social care | 2016 |
| PSS Properties Limited | Real estate | 2018 |
| Psscg PROP1 Limited | Real estate | 2026 |
| Psthankyou Limited | Households | 2017 |
| PSV Partsmaster (UK) Limited | Wholesale & retail | 1993 |
| PSV2A Ltd | Real estate | 2017 |
| PTG Digital Limited | Professional & scientific | 2022 |
| PTG Directors Limited | Professional & scientific | 2026 |
| PTG Nominees Limited | Professional & scientific | 2026 |
| PTG Shelf One Limited | Extraterritorial | 2026 |
| PTG Shelf Two Limited | Extraterritorial | 2026 |
| Ptnp Limited | Real estate | 2024 |
| Pudgespaddock Ltd | Wholesale & retail | 2025 |
| Pulse Creative Marketing Ltd | Administrative & support | 2025 |
| Punjabiwoodworks Ltd | Wholesale & retail | 2026 |
| Pure B2B Ltd | Other services | 2011 |
| Pureair Kent Ltd | Energy | 2011 |
| Puresil - Techniflex Limited | Manufacturing | 1997 |
| Puretone Limited | Manufacturing | 1976 |
| Puretouch Properties Limited | Real estate | 2023 |
| Purevell Group Ltd | Wholesale & retail | 2025 |
| Pureways Ltd | Real estate | 2022 |
| Purple Aura Limited | Education | 2003 |
| Purple Badger Solutions Limited | Information & communication | 2021 |
| Purple Pomme Ltd | Construction | 2021 |
| Purple Rain Properties Ltd | Real estate | 2024 |
| Push Bold Ltd | Professional & scientific | 2026 |
| PWP Property LLP | | 2017 |
| Pyopumpkins Ltd | Wholesale & retail | 2019 |
| Pyxis Education Limited | Education | 2024 |
| Qcourt Close Management Company Ltd | Households | 2022 |
| Quality of Life PBS Skills and Resources Limited | Health & social care | 2022 |
| Quanstruct Consulting Ltd | Professional & scientific | 2015 |
| Quantiz Limited | Information & communication | 2014 |
| Quantock Limited | Real estate | 2019 |
| Quantock Projects Limited | Information & communication | 2017 |
| Quantum Cost Consulting Ltd | Professional & scientific | 2018 |
| Quantum One Capital Limited | Professional & scientific | 2023 |