| Porthcawl Driveways and Home Improvements CYF. | Construction | 2014 |
| Porthcawl Driveways Limited | Construction | 2025 |
| Porthcawl Elvis Festival Ltd | Arts & recreation | 2014 |
| Porthcawl Hospitality Ltd | Hospitality | 2025 |
| Porthcawl Security Services Ltd | Administrative & support | 2021 |
| Porthcawl Surf Shop Ltd | Wholesale & retail | 2022 |
| Portway Home Improvements Limited | Construction | 2020 |
| Portway Sunbed Salon Limited | Other services | 2020 |
| Positive Purpose Consultancy Ltd | Information & communication | 2024 |
| Posterfit Limited | Administrative & support | 2012 |
| Pottery Cafe (Ewenny) Limited | Hospitality | 2019 |
| Pound Pubs Ltd | Hospitality | 2025 |
| Powell Bros Investments Ltd | Real estate | 2024 |
| Power and Lighting Solutions Ltd | Energy | 2017 |
| Power House Rentals Ltd | Real estate | 2024 |
| Powerhouse Energy Group PLC | Professional & scientific | 2000 |
| Powerhouse Energy International Ltd | Professional & scientific | 2023 |
| Powerhouse Energy UK Limited | Professional & scientific | 2010 |
| Powernet Electrical & Fire Systems Ltd | Construction | 2020 |
| PR Lettings Limited | Real estate | 2014 |
| Praise Healthcare Ltd | Administrative & support | 2019 |
| Precious Petals Florist Ltd | Wholesale & retail | 2021 |
| Precision Surveying Solutions Ltd | Professional & scientific | 2026 |
| Premier Automotive Solutions Ltd | Financial services | 2018 |
| Premier Plastic Services Ltd | Manufacturing | 2016 |
| Premier Resin Drives .Co.Uk Ltd | Administrative & support | 2019 |
| Premium Italy Limited | Wholesale & retail | 2024 |
| Prestdon Limited | Construction | 2024 |
| Prestige Airport Transfers Bridgend Limited | Transport & logistics | 2016 |
| Prestige Brickwork Pencoed Ltd | Construction | 2019 |
| Prestley Limited | Information & communication | 2024 |
| Prestoak Limited | Extraterritorial | 2026 |
| Prestrow Limited | Extraterritorial | 2025 |
| Pretty Nostalgic Limited | Information & communication | 2011 |
| Pretty Woman (Whitstable) Ltd | Wholesale & retail | 2019 |
| Price and Cullen Property Management Ltd | Real estate | 2024 |
| Price Brothers Electrical Ltd | Construction | 2019 |
| Pricesalesagents Ltd | Wholesale & retail | 2025 |
| Prim & Proper-Ty Limited | Real estate | 2024 |
| Prime Anaesthetics Ltd | Health & social care | 2015 |
| Prime Sell Online Ltd | Wholesale & retail | 2023 |
| Principality Healthcare Limited | Manufacturing | 2016 |
| Print S & G Limited | Manufacturing | 2012 |
| Prints of Wales | | 1988 |
| Printwave UK Ltd | Wholesale & retail | 2014 |
| Priority Planning (SW) Ltd | Professional & scientific | 2025 |
| Prism the Laser Specialists Ltd | Other services | 2018 |
| Pritchard Quality Consultants Limited | Information & communication | 2013 |
| Private Psychiatry Services Limited | Health & social care | 2025 |
| Priyantha Kandanearachchi Ltd | Administrative & support | 2025 |
| Pro Air Systems Limited | Construction | 2026 |
| Pro Volt Engineering Services Ltd | Construction | 2020 |
| Pro-Creative Prints Ltd | Wholesale & retail | 2025 |
| Pro-Medica Services (South Wales) Limited | Financial services | 2002 |
| Pro-Social Limited | Professional & scientific | 2014 |
| Process Design and Installation Limited | Manufacturing | 2017 |
| Procure+ Ltd | Professional & scientific | 2014 |
| Production 78 Limited | Arts & recreation | 2001 |
| Professional Sprinkler Systems Ltd | Construction | 2019 |
| Progres Plus Norge Limited | Extraterritorial | 2011 |
| Progress Discovery Ltd | Wholesale & retail | 2022 |
| Prohealth Healthcare Ltd | Health & social care | 2023 |
| Prolific Recruitment Ltd | Administrative & support | 2022 |
| PROP9 Limited | Real estate | 2026 |
| Propdev (UK) Limited | Real estate | 2002 |
| Properties of Pearl Ltd | Real estate | 2024 |
| Properties of Pearl SA Ltd | Real estate | 2025 |
| Property Assistance Limited | Construction | 2015 |
| Property Building Maintenance (Wales) Limited | Construction | 1996 |
| Property Connected Limited | Real estate | 2016 |
| Property Contracts Limited | Real estate | 2019 |
| Proseal Roofing Ltd | Construction | 2013 |
| Prospectr Ltd | Administrative & support | 2018 |
| Prosper Ltd | Professional & scientific | 2005 |
| Protect Your Assets Today Ltd | Information & communication | 2024 |
| Protheus Ltd | Manufacturing | 2021 |
| Protos Plastics to Hydrogen NO. 1 Limited | Extraterritorial | 2020 |
| Provinca Developments (One) Limited | Real estate | 2016 |
| PS Lighting Solutions Limited | Construction | 2005 |
| Psidium Limited | Real estate | 1972 |
| PSP48 Management Company Limited | Households | 2016 |
| PTL Hullabaloos Limited | Administrative & support | 2012 |
| Puerto Madryn CYF. | Wholesale & retail | 2025 |
| Pulse Sourcing Ltd | Wholesale & retail | 2024 |
| Purdue Limited | Wholesale & retail | 2006 |
| Pure Indulgence Pontyclun Ltd | Other services | 2023 |
| Puremont Cleaning Services Ltd | Administrative & support | 2023 |
| Purple Carrot Estates Ltd. | Real estate | 2018 |
| Purple Iriz Limited | Information & communication | 2014 |
| Purple Marmoset Publishing Ltd | Information & communication | 2024 |
| Purslow Jones Ltd | Financial services | 2020 |
| PVM Communications Ltd | Wholesale & retail | 2020 |
| PVM Maid 2 Clean Ltd | Administrative & support | 2021 |
| PW Glamorgan Limited | Hospitality | 2025 |
| PYB Fitness Ltd Ltd | Arts & recreation | 2020 |
| PYB Fitness Maesteg Ltd | Arts & recreation | 2024 |
| Pyle and Kenfig Golf Club Limited | Arts & recreation | 2024 |
| Pyle Autocentre Ltd | Wholesale & retail | 2022 |
| Pyle Car Wash Ltd | Administrative & support | 2023 |
| Pyle Garden Centre Holdings Limited | Financial services | 2024 |