| Pentwyn Service Station Limited | Extraterritorial | 1962 |
| Penwith Cottage Ltd | Construction | 2023 |
| Penyfodau Milk Company Ltd | Other services | 2021 |
| Penyview Ltd | Real estate | 2019 |
| People CAN DO IT CIC | Information & communication | 2025 |
| People Homes Ltd | Real estate | 2025 |
| Peppermint OPS Ltd | Hospitality | 2015 |
| Peppop Ltd | Hospitality | 2026 |
| PER Ardua Leisure Limited | Extraterritorial | 2002 |
| Per-Fit Kitchens Ltd | Construction | 2006 |
| Pera Skin Clinic Ltd | Other services | 2023 |
| Perago-Wales Limited | Information & communication | 2016 |
| Percepture Limited | Information & communication | 2015 |
| Perdue Developments Ltd | Real estate | 2023 |
| Perdue Limited | Extraterritorial | 2023 |
| Perdue Recycling Ltd | Water & waste | 2018 |
| Perez Rail & Civils Ltd. | Construction | 2016 |
| Perfect Media Productions Ltd | Information & communication | 2025 |
| Perfectline Motor Repairs Limited | Wholesale & retail | 2021 |
| Perfectlypamperedparties Ltd | Arts & recreation | 2026 |
| Perfectpropertywales Ltd | Real estate | 2017 |
| Perffaith Properties Limited | Real estate | 2019 |
| Perfformio Ltd | Education | 2017 |
| Performance Direct Swansea Limited | Wholesale & retail | 2009 |
| Performance Factory Productions Limited | Arts & recreation | 2016 |
| Perkily Consulting Ltd | Professional & scientific | 2023 |
| Perriswood Archery STS Ltd | Manufacturing | 2013 |
| Personal Stories Told Limited | Information & communication | 2019 |
| Personology Ltd | Administrative & support | 2021 |
| Petallica Flower Farm C.I.C. | Agriculture & fishing | 2021 |
| Peter Clark, FCA, Fbim, CYF | Professional & scientific | 2003 |
| Peter Davies Agricon Limited | Agriculture & fishing | 2006 |
| Peter Genders Bees Ltd | Wholesale & retail | 2015 |
| Peter Grigg & Associates Limited | Professional & scientific | 2018 |
| Peter Mordecai Transport Limited | Transport & logistics | 2003 |
| Peter Morgan Property Group Limited | Real estate | 2003 |
| Peter Nicholas & Sons Ltd | Construction | 2004 |
| Petersens Ltd. | Information & communication | 1998 |
| Petersfield Sushi Ltd | Hospitality | 2018 |
| Peton Properties Limited | Hospitality | 1975 |
| Petrich Surveyors Ltd | Real estate | 2010 |
| Petro Express Limited | Wholesale & retail | 2014 |
| Peyton Properties Limited | Real estate | 2024 |
| PG Asset Developments Ltd | Real estate | 2025 |
| PH7 Engineering Limited | Financial services | 2022 |
| PH7 Property Ltd | Real estate | 2024 |
| Phanta F Afri Trade Ltd | Wholesale & retail | 2025 |
| Phantom Lights Ltd | Arts & recreation | 2025 |
| Phantom Prestige Car Hire Limited | Extraterritorial | 2012 |
| Phantompathvpn Ltd | Information & communication | 2026 |
| Pharmacare Global Limited | Extraterritorial | 2009 |
| Pharmacare Premium Limited | Professional & scientific | 2016 |
| Pharmacy Business Consultant Ltd | Professional & scientific | 2024 |
| Pharmaoz Limited | Health & social care | 2023 |
| Phaseadmire Limited | Real estate | 1995 |
| Phaserunner Ltd | Arts & recreation | 2021 |
| Phasor Services Limited | Construction | 2003 |
| PHD Lounge Ltd | Information & communication | 2023 |
| PHE Property Limited | Real estate | 2022 |
| Pheeb Management Ltd | Professional & scientific | 2024 |
| Phelps and Williams Limited | Wholesale & retail | 2003 |
| PHG Associates Limited | Professional & scientific | 2026 |
| Phil 4 Beds Limited | Wholesale & retail | 2022 |
| Phil Fraser Ltd | Manufacturing | 2019 |
| Phil Matthews Investments Limited | Real estate | 2017 |
| Phil Thomas EYE Care Limited | Health & social care | 2014 |
| Philip Ashelford Welding Services Ltd | Manufacturing | 2019 |
| Philip Evans Holdings Limited | Professional & scientific | 2018 |
| Philip Hooper Ltd | Education | 2004 |
| Philip Hunt Home Improvements Limited | Construction | 2022 |
| Phillip G. Davies Ltd | Other services | 2005 |
| Phillips & Foligno Associates Ltd. | Financial services | 2022 |
| Phillips & SON Landscape Contractors Ltd | Administrative & support | 2003 |
| Phillips Carpentry Services Limited | Construction | 2017 |
| Phillips Equity Partners Ltd | Financial services | 2026 |
| Phillips Hafan Group Ltd | Financial services | 2026 |
| Phillips Hospitality Swansea Limited | Hospitality | 2025 |
| Phillips Maintenance (Wales) Limited | Professional & scientific | 1986 |
| Phillips Properties Ltd | Real estate | 2019 |
| Phillips Residential Holdings Limited | Real estate | 2025 |
| Phillips Services (Wales) Limited | Construction | 1969 |
| Phirsk Hotels Limited | Hospitality | 2016 |
| Phoenix Aesthetics Ltd | Wholesale & retail | 2020 |
| Phoenix Cabs (Gorseinon) Limited | Transport & logistics | 2009 |
| Phoenix Cash and Carry Ltd | Wholesale & retail | 2026 |
| Phoenix Catering Solutions Limited | Wholesale & retail | 2017 |
| Phoenix Developments (Wales) Limited | Extraterritorial | 2002 |
| Phoenix Hair Neath Ltd | Other services | 2019 |
| Phoenix Residential Property Limited | Real estate | 2023 |
| Phoenix Way Limited | Financial services | 2022 |
| Phoenix Way Swansea Limited | Financial services | 2025 |
| Phonebooks in the Attic Ltd | Wholesale & retail | 2022 |
| Phonelink Maintenance Limited | Real estate | 2002 |
| Phones UN Limited | Extraterritorial | 2023 |
| Phool Koli Ltd | Hospitality | 2018 |
| Physics Pathway Limited | Education | 2024 |
| Physis Property Ltd | Real estate | 2024 |
| PI Holding & Management Ltd | Professional & scientific | 2024 |
| PIC Swansea Ltd | Arts & recreation | 2026 |
| Pic-Up Spares Limited | Wholesale & retail | 1974 |