| Osbournandjames Ltd | Construction | 2026 |
| Osen Limited | Financial services | 2026 |
| Oshthrbarber Ltd | Other services | 2026 |
| Outland Studio Ltd | Information & communication | 2024 |
| Owcargold Limited | Wholesale & retail | 2022 |
| Owens (Pallet Networks) Limited | Transport & logistics | 2024 |
| Owens (Road Services) Limited | Transport & logistics | 1977 |
| Ownerzhub Ltd | Real estate | 2026 |
| P H Trading (Powys) Ltd | Wholesale & retail | 2004 |
| P Stanley Associates Ltd | Professional & scientific | 2010 |
| P&M Estates Ltd | Health & social care | 2020 |
| P&Sdcommunications Limited | Information & communication | 2010 |
| P.A.I. Group Limited | Construction | 1999 |
| P.G.M. Designs Limited | Professional & scientific | 1988 |
| P2P Ltd | Arts & recreation | 2026 |
| Padda Care Homes Ltd | Health & social care | 2015 |
| Padda Care Limited | Health & social care | 2017 |
| Padda Development (Wales) Ltd | Construction | 2017 |
| Padda Group Ltd | Financial services | 2020 |
| Paean Ltd | Health & social care | 2021 |
| Pafiliwn Penygroes CYF | Wholesale & retail | 2004 |
| Palmtree Homes Ltd | Real estate | 2017 |
| Panteg Garage Limited | Wholesale & retail | 2010 |
| Paragon IT Limited | Information & communication | 2015 |
| Parallel 91 Ltd | Professional & scientific | 2025 |
| Parc Emlyn Acquisitions Limited | Construction | 2009 |
| Parc Emlyn Developments Limited | Construction | 2009 |
| Parc Y DRE Bowls Club Ltd | Arts & recreation | 2018 |
| Park View Dairy Limited | Wholesale & retail | 2017 |
| Parker Brothers (Contractors) Limited | Construction | 1981 |
| Parker Brothers (Holdings) Limited | Financial services | 1958 |
| Parker Davies Portabello Limited | Hospitality | 2007 |
| Parker Plant Hire Limited | Administrative & support | 1973 |
| Parkstone Financial Planning Ltd | Financial services | 2012 |
| Parousia Electrical Contractor Ltd | Construction | 2023 |
| Pask Developments Ltd | Real estate | 2025 |
| Passion Distribution Limited | Information & communication | 2008 |
| Paul Rodriguez Wealth Management Limited | Financial services | 2015 |
| Paul Underwood Carpets & Flooring Limited | Wholesale & retail | 2018 |
| Paulg and SON Limited | Transport & logistics | 2018 |
| PAYRA26 Limited | Hospitality | 2026 |
| PB Residential Limited | Households | 2004 |
| Peake Groundworks Ltd | Administrative & support | 2024 |
| Peake’S Properties Ltd | Households | 2025 |
| Pebble Recruitment Ltd | Administrative & support | 2023 |
| Pebbles (Llanelli) Ltd | Other services | 2015 |
| Pembrey Heating and Plumbing Limited | Construction | 2004 |
| Pendragon Environmental Developments (NO.2) Limited | Real estate | 2002 |
| Pendragon Environmental Developments Limited | Real estate | 2002 |
| Pendragon Investments Limited | Real estate | 2001 |
| Pendragon Waste & Skip Hire Limited | Water & waste | 2009 |
| Pensaernïaeth Williams Architecture Ltd. | Professional & scientific | 2020 |
| Pensarn Developments Limited | Construction | 2023 |
| Pentre Nicklaus (Phase 6) Management Company Limited | Professional & scientific | 2011 |
| Penygroes Concrete Products Limited | Manufacturing | 1978 |
| Peoplespeakup Ltd | Arts & recreation | 2017 |
| Performance Properties Sourcing Ltd | Real estate | 2016 |
| Personal Safety Planning Companion Ltd | Professional & scientific | 2026 |
| Peter Hart Limited | Other services | 2016 |
| Peter's Plumbing Supplies Limited | Administrative & support | 2018 |
| Pharmaciststat Ltd | Health & social care | 2023 |
| Phat BOY Kitchen Ltd | Hospitality | 2026 |
| Pheener Properties Ltd | Real estate | 2021 |
| Philip Avery & Co. Limited | Professional & scientific | 2017 |
| Phillip Rees Plant Limited | Administrative & support | 2025 |
| Phillip Rees Welding Limited | Manufacturing | 2005 |
| Phillips and ASH Ltd | Hospitality | 2025 |
| Phillips's Lane Limited | Real estate | 2021 |
| Photography by Alexander James Ltd | Professional & scientific | 2020 |
| Pincombe Ltd | Information & communication | 2011 |
| Pink Paradiso Glass Jewellery Ltd | Other services | 2017 |
| Pinnacle Commercial Solutions Ltd | Professional & scientific | 2025 |
| Pioneer Film and Television Productions Limited | Information & communication | 1988 |
| Pioneer Productions International Limited | Information & communication | 2003 |
| Pioneer Productions Media Group Limited | Information & communication | 2008 |
| Pisces Style Limited | Other services | 2008 |
| Pizzaros Limited | Hospitality | 2025 |
| Plant Hapus Ltd | Health & social care | 2023 |
| Plantmax Equipment Ltd | Wholesale & retail | 2020 |
| Plas Llanelly House CYF | Arts & recreation | 2013 |
| Plnthouse Ltd | Manufacturing | 2026 |
| Pmc-Makeitsweet Ltd | Hospitality | 2025 |
| Poet Systems Ltd | Professional & scientific | 2018 |
| Poisegrange Limited | | 1981 |
| Pomeroy Property Ltd | Real estate | 2021 |
| Ponentine SIX Limited | Administrative & support | 2005 |
| Pontarddulais Dental Laboratory Limited | Health & social care | 2002 |
| Pontrilas Harvesting Limited | Wholesale & retail | 2018 |
| Pontrilas Packaging Limited | Manufacturing | 1989 |
| Ponty Balti Ltd | Hospitality | 2024 |
| Ponty Chippy Limited | Hospitality | 2017 |
| Ponty Cuisine Limited | Hospitality | 2025 |
| Poole and Hurley Properties Limited | Real estate | 2017 |
| Positivelee Ltd | Professional & scientific | 2025 |
| Powell Portfolio Group Ltd | Real estate | 2025 |
| Power Aesthetics (Ladies) Ltd | Arts & recreation | 2025 |
| Power on Demand Ltd | Construction | 2012 |
| Power Plus Motor Company Ltd | Manufacturing | 2010 |
| Power Steering Solutions Limited | Manufacturing | 2017 |
| Power Voltage Ltd | Wholesale & retail | 2023 |