| Pax-Bags Limited | Administrative & support | 2017 |
| Paxmund Builds Ltd | Construction | 2023 |
| Payments Shed Media Ltd | Information & communication | 2025 |
| Payne Lettings Limited | Real estate | 2015 |
| Payne N Gainz Ltd | Education | 2023 |
| Payne's Pubs Ltd | Hospitality | 2024 |
| Payst Limited | Hospitality | 2016 |
| PB Engineering (USK) Limited | Manufacturing | 2003 |
| PB Project Management (Wales) Limited | Professional & scientific | 2015 |
| PB Rentals Ltd | Real estate | 2021 |
| PB Structural Design Limited | Professional & scientific | 2014 |
| PBE Associates Ltd | Professional & scientific | 2025 |
| PBE Bikepro Services Ltd | Wholesale & retail | 2022 |
| PBK Partnerships Limited | Professional & scientific | 2026 |
| Pbpianos CYF | Wholesale & retail | 2025 |
| PBS Barber Limited | Other services | 2025 |
| PCA DOM 1 Limited | Public administration | 2025 |
| PCA DOM 2 Limited | Public administration | 2025 |
| PCA Property Limited | Real estate | 2021 |
| PCF Holdings Limited | Professional & scientific | 2007 |
| PCF Print Management Ltd | Professional & scientific | 1997 |
| Pcgtrans Ltd | Transport & logistics | 2017 |
| Pcmacrepair Ltd | Manufacturing | 2019 |
| PD Paint Supplies Ltd | Wholesale & retail | 2020 |
| PDG Safety Limited | Professional & scientific | 2013 |
| PDH Ortho Limited | Health & social care | 2015 |
| Pdne Ltd | Real estate | 2026 |
| Peach Contracting Limited | Construction | 2016 |
| Peach Group Holdings Ltd | Financial services | 2025 |
| Peach Palacegb Ltd | Wholesale & retail | 2023 |
| Peaches Wellness Collective Limited | Other services | 2024 |
| Peachestraining Limited | Other services | 2024 |
| Peacheys CA Limited | Professional & scientific | 1999 |
| Peachy Productions (London) Ltd | Administrative & support | 2005 |
| Peacock Passage Management Company Limited | Real estate | 1999 |
| Peak Talent Ltd | Professional & scientific | 2026 |
| Peakebuildingservices Limited | Construction | 2020 |
| Peakemobility Limited | Construction | 2020 |
| Peakflow Ventures Ltd | Wholesale & retail | 2025 |
| Pear Ware Limited | Manufacturing | 2025 |
| Pearlybodybuilding Ltd | Arts & recreation | 2023 |
| Peel Investment Ltd | Real estate | 2019 |
| Pegasus Hydro Limited | Wholesale & retail | 2004 |
| Pekorius Limited | Construction | 2025 |
| Pembrey Leisure Activities Limited | Arts & recreation | 2010 |
| Pembrokeshire Wooden Garden Company Ltd | Manufacturing | 2024 |
| Pems Developments Limited | Construction | 2015 |
| PEN Y Parc Limited | Agriculture & fishing | 2012 |
| Penallta Developments Limited | Construction | 2024 |
| Penallta Heritage Management Limited | Real estate | 2007 |
| Penarth Investments Ltd | Construction | 2019 |
| Pencoed Pavvs Ltd | Professional & scientific | 2024 |
| Penelope’S Café Limited | Hospitality | 2021 |
| Penhow Civil Engineering Limited | Wholesale & retail | 1994 |
| Penhow Mews Management Company Limited | Households | 2000 |
| Penland Developments Limited | Construction | 1991 |
| Penny Lane Partnership Limited | Construction | 2014 |
| Pension the Pennies Ltd | Information & communication | 2018 |
| Pentacle Pubs Ltd | Hospitality | 2024 |
| Pentad Lettings Ltd | Real estate | 2021 |
| Pentagon Business Solutions Ltd | Financial services | 2025 |
| Pentagon Financial Services Ltd | Financial services | 2018 |
| Pentagon Travel Ltd | Transport & logistics | 2025 |
| Pentwynmawr Store Ltd | Wholesale & retail | 2023 |
| Penwood Developments Limited | Real estate | 2006 |
| Penwood Estates Limited | Real estate | 2011 |
| Penylan Country Lodge Limited | Other services | 2003 |
| Penylan Court Management Company (Newport) Limited | Households | 2012 |
| Penywaun Farms Limited | Agriculture & fishing | 2002 |
| People Matter I.W. | Health & social care | 2011 |
| People's Prosperity Project CIC | Education | 2022 |
| Peoplescape Limited | Professional & scientific | 2025 |
| Peosyspro Limited | Professional & scientific | 2016 |
| Pepcc Developments Limited | Real estate | 2025 |
| Peppinos Newport Ltd | Hospitality | 2025 |
| Pepspubs Ltd | Hospitality | 2026 |
| Percipient Consulting Ltd | Administrative & support | 2017 |
| Perducta Limited | Professional & scientific | 2011 |
| Perese Company Limited | Arts & recreation | 2024 |
| Perfect Path Recruitment Ltd | Administrative & support | 2018 |
| Performance Emissions Ltd | Wholesale & retail | 2023 |
| Performance Property 100 Ltd | Wholesale & retail | 2022 |
| Performing Arts Education Service Limited | Education | 2005 |
| Perimeter AI Ltd | Construction | 2024 |
| Perky People Financial Services Ltd | Financial services | 2019 |
| Perlau Gwyn Ltd | Real estate | 2017 |
| Perrells Group Limited | Information & communication | 2021 |
| Perrells RP Limited | Real estate | 2021 |
| Perrott Engineering Ltd | Other services | 2024 |
| Personal Touch Home Maintenance Ltd | Construction | 2023 |
| Personal Wealth Management (South Wales) Ltd | Other services | 2017 |
| Personalised Diamante Limited | Wholesale & retail | 2017 |
| Personalised Elegance Ltd | Wholesale & retail | 2019 |
| Personalised Performance Ltd | Professional & scientific | 2025 |
| Personality Management Limited | Professional & scientific | 2006 |
| Peruca Limited | Wholesale & retail | 2018 |
| Pete K. Carpentry Ltd | Construction | 2019 |
| Peter Booth Electrical Contractors Limited | Construction | 2013 |
| Peter Cotter Welding Limited | Construction | 2009 |
| Peter Evans Computer Consultancy Limited | Information & communication | 1997 |