| PRL Property Services Ltd | Real estate | 2022 |
| Pro Audio Hire Ltd | Administrative & support | 2017 |
| Pro Care Builders Ltd | Construction | 2024 |
| Pro Digital Solutions Ltd | Wholesale & retail | 2025 |
| Pro FAB Developments Ltd | Manufacturing | 2019 |
| Pro Goods & Tech Ltd | Wholesale & retail | 2023 |
| Pro Piano Move Limited | Transport & logistics | 2022 |
| Pro Resin & Groundworks Ltd | Administrative & support | 2023 |
| Pro Services Group Ltd | Administrative & support | 2010 |
| Pro Spec Interiors Limited | Construction | 2001 |
| Pro-Base Installations Ltd | Construction | 2014 |
| Pro-Coat Painting & Decorating Ltd | Construction | 2025 |
| Pro-Gleam Exterior Cleaning Services Group Ltd | Administrative & support | 2018 |
| Pro-Seat Global Limited | Manufacturing | 2021 |
| Pro-Tec Alarms Limited | Manufacturing | 2002 |
| Pro-Tect GRP Enclosures Limited | Manufacturing | 2009 |
| Pro-Tect Properties Ltd | Real estate | 2016 |
| Proable Group Ltd | Construction | 2017 |
| Probate Expert GP Limited | Health & social care | 2021 |
| Procepts Nutrition Limited | Wholesale & retail | 2014 |
| Process Outsource Holdings Ltd | Financial services | 2021 |
| Procloud Ltd | Information & communication | 2020 |
| Procoll Ltd | Professional & scientific | 2018 |
| Procum Limited | Construction | 1996 |
| Prodam Ltd | Construction | 2017 |
| Professional Drivers H&C Ltd | Wholesale & retail | 2022 |
| Professional Electronic Security Systems Ltd | Administrative & support | 2004 |
| Professional Facilities Management Limited | Administrative & support | 2004 |
| Professional Security Management Limited | Administrative & support | 2000 |
| Professional Systems Integrators Ltd | Manufacturing | 2002 |
| Professional Together Limited | Information & communication | 2016 |
| Profilink Global Logistics Ltd | Real estate | 2025 |
| Profitable Growth Ltd | Professional & scientific | 2024 |
| Prognomics Ltd | Professional & scientific | 2014 |
| Progress Surf Community CIC | Education | 2023 |
| Progressus Care Ltd | Financial services | 2023 |
| Progressus Care Services LLP | | 2025 |
| Project Carpentry Services Limited | Manufacturing | 2012 |
| Project One Design and Management Limited | Construction | 2011 |
| Project One Holdings Limited | Financial services | 2025 |
| Promolli Ltd | Extraterritorial | 2015 |
| Promotion AK Limited | Arts & recreation | 2025 |
| Promotions & Branding Limited | Professional & scientific | 2025 |
| Proof Skincare Limited | Other services | 2026 |
| Prop Master Limited | Information & communication | 2019 |
| Propartum Ltd | Other services | 2025 |
| Propco 10SJC Limited | Real estate | 2024 |
| Proper T DEN Ltd | Real estate | 2022 |
| Properties by Leah Haines Ltd | Construction | 2023 |
| Property Agents South Wales Limited | Real estate | 2020 |
| Property ANN Limited | Administrative & support | 2016 |
| Property Asset Solutions Ltd. | Real estate | 2017 |
| Property Auction Agent Ltd | Real estate | 2023 |
| Property Brothers Ltd | Real estate | 2016 |
| Property by SMK Limited | Real estate | 2021 |
| Property Debt Solicitors LLP | | 2025 |
| Property Detective Limited | Information & communication | 2011 |
| Property Invested Ltd | Real estate | 2020 |
| Property Investment Swansea Limited | Real estate | 2008 |
| Property Management Rentals Ltd | Real estate | 2007 |
| Property Performance Group Ltd | Construction | 2026 |
| Property Properly Ltd | Other services | 2019 |
| Property Search Wales Limited | Real estate | 2004 |
| Property Square Limited | Real estate | 2024 |
| Property Traders and Management UK Limited | Construction | 2019 |
| Property Traders Commercial Incorporated Limited | Real estate | 2025 |
| Property Traders Incorporated Limited | Real estate | 2022 |
| Propertyserve Services Limited | Administrative & support | 2013 |
| Proprosperity Ltd | Agriculture & fishing | 2024 |
| PROPS@NEWTON81 Limited | Information & communication | 2023 |
| Propsmarts.Com Ltd | Information & communication | 2022 |
| Prosaris Solutions (UK) Limited | Manufacturing | 2025 |
| Prosthetic Science Ltd | Health & social care | 2017 |
| Proteam Building Services Limited | Water & waste | 2004 |
| Protect Family Plans Ltd | Financial services | 2016 |
| Proud Lettings Limited | Real estate | 2023 |
| Proud Marketplace Ltd | Wholesale & retail | 2023 |
| Provado Services Ltd | Construction | 2025 |
| Proximo Travel Services Limited | Administrative & support | 2019 |
| PRS Commercial Limited | Professional & scientific | 2020 |
| PRU Medical Ltd | Health & social care | 2018 |
| Prydferth Retreats Ltd | Hospitality | 2026 |
| Pryzm Property Limited | Real estate | 2026 |
| PS Dhaliwal Construction Limited | Construction | 2023 |
| PSF (Wales) Limited | Manufacturing | 2003 |
| PSR Global Ltd | Administrative & support | 2026 |
| PSR Search Ltd | Administrative & support | 2025 |
| PSW Project Management Ltd | Real estate | 2017 |
| Psyche & Reason Ltd. | Information & communication | 2023 |
| Psychloan Limited | Health & social care | 2010 |
| Psychological Support Centre Limited | Health & social care | 2007 |
| Psychskills Ltd | Health & social care | 2026 |
| PT (Hair & Beauty) Ltd | Other services | 2005 |
| PTR Limited | Manufacturing | 2007 |
| PTW Plumbing Ltd | Construction | 2011 |
| PU5HXOULS Ltd | Wholesale & retail | 2025 |
| Pudsey Plant Hire Limited | Administrative & support | 1966 |
| Puffin Bathrooms Limited | Wholesale & retail | 2020 |
| Puffin House Management Limited | Real estate | 2000 |
| PUG Group Limited | Financial services | 2018 |