| Primpas Limited | Construction | 2026 |
| Primr Health Ltd | Health & social care | 2018 |
| Primus Accountancy and Business Services Ltd | Administrative & support | 2018 |
| Primus Business Solutions Ltd | Administrative & support | 2025 |
| Primus Management Consultancy Ltd | Information & communication | 2025 |
| Principle Care Agency Limited | Administrative & support | 2014 |
| Principle Care Properties Limited | Real estate | 2025 |
| Print Cycle Solutions Ltd | Administrative & support | 2021 |
| Printplaza Ltd | Wholesale & retail | 2023 |
| Printsetters.Com Ltd | Manufacturing | 2009 |
| Priorslee Lake Water Sports Association Limited | Arts & recreation | 1985 |
| Priory Barns (Carisbrooke) Management Company Limited | Households | 2000 |
| Priory Farm Lane Residents Association Limited | Other services | 2002 |
| Priory Property Services (IW) Ltd | Construction | 2024 |
| Prisma Sign and Construction Ltd | Energy | 2016 |
| Pritchard Ventures Ltd | Transport & logistics | 2016 |
| Private Pharma Ltd | Wholesale & retail | 2017 |
| Private Pharma Wholesale Ltd | Extraterritorial | 2023 |
| Privileged Properties Limited | Extraterritorial | 2016 |
| PRJ Financial Planning Ltd | Financial services | 2012 |
| PRJ Private Holdings Ltd | Real estate | 2018 |
| Pro Finish Building and Plastering Ltd | Construction | 2016 |
| Pro Flow Heating Limited | Construction | 2024 |
| Pro Payroll Solutions Limited | Professional & scientific | 2007 |
| Pro-Eng Consulting Limited | Professional & scientific | 2023 |
| Pro-Per-Te Limited | Hospitality | 2018 |
| Pro-Tech Vocational Limited | Education | 2015 |
| Process Engineering Design Limited | Professional & scientific | 2010 |
| Procurement AI Ltd | Wholesale & retail | 2024 |
| Prodoneq Ltd | Professional & scientific | 2022 |
| Prodrive Adas Calibrations Ltd | Wholesale & retail | 2026 |
| Product Cost Optimisation Limited | Professional & scientific | 2012 |
| Professional Solutions Consultants Limited | Financial services | 2001 |
| Profix Property Preservation Limited | Construction | 2016 |
| Profync Limited | Information & communication | 2026 |
| Progress EDI Ltd | Professional & scientific | 2024 |
| Progressive Consultancies Ltd | Information & communication | 2013 |
| Progressive Precast Erection Limited | Construction | 2004 |
| Project Aero Limited | Professional & scientific | 2014 |
| Project Delta Limited | Other services | 2023 |
| Project Linus UK Community Interest Company | Arts & recreation | 2013 |
| Project Power Contracting Ltd | Construction | 2023 |
| Project Power Limited | Administrative & support | 2014 |
| Projects Electrical Services Ltd. | Construction | 2022 |
| Prolaser Limited | Manufacturing | 2014 |
| Promark Sales & Marketing Limited | Financial services | 2012 |
| Pronto Logistics Limited | Transport & logistics | 2018 |
| Propagate Personal Wealth Care Limited | Real estate | 2014 |
| Propel Finance Group Holdings Limited | Financial services | 2013 |
| Propel Finance NO 1 Limited | Administrative & support | 2016 |
| Propel Group Finance Limited | Financial services | 2013 |
| Propello Homes Limited | Real estate | 2025 |
| Propelpay Limited | Financial services | 2024 |
| Proper Tea Lets Ltd | Real estate | 2023 |
| Properties by Gitana Ltd | Real estate | 2025 |
| Property Assessment Services Ltd | Extraterritorial | 2024 |
| Property by Shaw Ltd | Hospitality | 2025 |
| Property FINDERS(2024) Limited | Households | 2024 |
| Property Maintenance & Cleaning Services Ltd | Administrative & support | 2020 |
| Property Management (Solent Court I.W.) Limited | Households | 1985 |
| Property Management Plus Limited | Households | 2017 |
| Property Matters Newport Ltd | Hospitality | 2006 |
| Property REG Limited | Real estate | 2017 |
| Property Tax Solutions Limited | Professional & scientific | 2002 |
| PROPES28 Limited | Real estate | 2018 |
| Prophetic Mountain of Prayer for ALL Nations Ltd | Other services | 2020 |
| Propper Kash Ltd | Arts & recreation | 2019 |
| Proqual AB Limited | Information & communication | 2010 |
| Prosecco Pronto Limited | Hospitality | 2016 |
| Prospect Mortgage Services Ltd | Financial services | 2014 |
| Prospr Holdings (Wales) Limited | Financial services | 2021 |
| Protec Lighting Ltd | Arts & recreation | 2022 |
| Protech Utilities Ltd | Construction | 2024 |
| Protectahome Building Preservation Limited | Extraterritorial | 2011 |
| Protectahome Building Solutions Limited | Construction | 2011 |
| Protectahome Group Limited | Financial services | 2006 |
| Protectahome Limited | Construction | 1980 |
| Protectahome Pest Control Limited | Extraterritorial | 1983 |
| Protectahome Property Care Limited | Extraterritorial | 2011 |
| Protectahome Remedial Solutions Limited | Extraterritorial | 2011 |
| Protectahome Structural Solutions Limited | Extraterritorial | 2011 |
| Protectahome Waterproofing Limited | Extraterritorial | 2011 |
| Protection Treatments Limited | Extraterritorial | 1976 |
| Protego Consult Ltd | Other services | 2019 |
| Protein UK 2025 Ltd | Health & social care | 2025 |
| Protex Insurance Specialists Ltd | Financial services | 2023 |
| Protherapy Clinic Ltd | Health & social care | 2021 |
| Proton Wills and Estate Planning Limited | Professional & scientific | 2025 |
| Provably Technologies Ltd | Information & communication | 2024 |
| Proven Coaching Ltd | Professional & scientific | 2015 |
| Providence Companion Care Limited | Health & social care | 2026 |
| Provisur Technologies UK Ltd | Manufacturing | 2022 |
| Proxybox Ltd | Information & communication | 2014 |
| Prudenceef UK Ltd | Health & social care | 2025 |
| Pryme Financial Ltd | Information & communication | 2022 |
| PS Health Care Services Limited | Health & social care | 2015 |
| PS Plumbing (IOW) Limited | Construction | 2014 |
| PS Power Ltd | Construction | 2022 |
| PSA Training & Consulting Ltd | Professional & scientific | 2021 |
| PSL Global Consulting Ltd | Professional & scientific | 2025 |