| Petffisio CYF | Professional & scientific | 2022 |
| Pethau Bychain CYF | Wholesale & retail | 2010 |
| Phil Anthony Plant & Agri Ltd | Administrative & support | 2021 |
| Phoenix Forge Ltd | Manufacturing | 2013 |
| Phoenix MED Clinic Ltd | Health & social care | 2026 |
| Phoenix Plastering Services Ltd | Construction | 2015 |
| Phoenix Properties (Wales) Limited | Construction | 2014 |
| Photohound Limited | Information & communication | 2020 |
| Phytolife Pharma UK Ltd | Wholesale & retail | 2025 |
| Pibwr Alpacas Limited | Agriculture & fishing | 2025 |
| Picmo Limited | Arts & recreation | 2011 |
| Picnic Basket Farm Ltd | Agriculture & fishing | 2021 |
| Picton House Limited | Hospitality | 2021 |
| Pinc Sheep Media Ltd | Professional & scientific | 2023 |
| Pingkin Limited | Information & communication | 2025 |
| Pink Street Publishing Limited | Information & communication | 2025 |
| Pinnafolixen Limited | Wholesale & retail | 2025 |
| Piper Scaffolding Contractors Limited | Construction | 2002 |
| Pirate Designs Limited | Wholesale & retail | 2016 |
| Pivotal Estates Ltd | Real estate | 2026 |
| Pivotal Grips Ltd | Information & communication | 2022 |
| Pixellink Ltd | Information & communication | 2025 |
| Pixieaction Limited | Professional & scientific | 1997 |
| PJJ Contractors Ltd | Construction | 2021 |
| Plan & Build Limited | Administrative & support | 1996 |
| Plant Y Goedwig CYF | Education | 2022 |
| Plasgwyn Farm Ltd | Agriculture & fishing | 2009 |
| Plushmoor Limited | Professional & scientific | 2013 |
| Pobl Solutions Ltd | Wholesale & retail | 2022 |
| Pobl Y Fforest | Agriculture & fishing | 2001 |
| Pods@Broadway Limited | Hospitality | 2017 |
| Pond View Lodges Ltd | Hospitality | 2025 |
| Pontcowin CYF | Other services | 2022 |
| Pontgarreg Farm Ltd | Agriculture & fishing | 2024 |
| Pontgarreg Properties Ltd | Real estate | 2024 |
| Poonys Thai Treats Limited | Hospitality | 2023 |
| Portowest L.P. | | 2018 |
| Pos-Hardware Limited | Wholesale & retail | 2012 |
| Power Check (Oxford) Limited | Construction | 1998 |
| Power for Wales Inc Ltd | Construction | 2014 |
| Powercut (Wales) Holdings Limited | Financial services | 2026 |
| Powercut (Wales) Limited | Wholesale & retail | 2010 |
| PQ Resources Limited | Professional & scientific | 2009 |
| Pragmatic HR Limited | Administrative & support | 2013 |
| Pragmatic Law Limited | Administrative & support | 2017 |
| Pragmatic Mentoring Limited | Administrative & support | 2016 |
| Preece's Garden & Tree Care Limited | Agriculture & fishing | 2024 |
| Preseli Holdings Ltd | Real estate | 2017 |
| Prestige Touch Carmarthen Ltd | Administrative & support | 2026 |
| Prints U Need Ltd | Extraterritorial | 2024 |
| Pro Groundworks (Carmarthen) Limited | Construction | 2019 |
| Pro Scaffolding (Carmarthen) Limited | Construction | 2025 |
| Pro-Spec Inspection Limited | Professional & scientific | 2007 |
| Proeliator Limited | Manufacturing | 2015 |
| Professional Lead Generation Limited | Administrative & support | 2020 |
| Profitstar PC | | 2017 |
| Project 7-20 Ltd | Construction | 2020 |
| Prostock Vets Limited | Professional & scientific | 2013 |
| Protonium Ltd | Manufacturing | 2019 |
| Pure Health & Safety Ltd. | Professional & scientific | 2017 |
| Purest Form Photography Ltd | Professional & scientific | 2025 |
| PW Solar Ltd | Construction | 2026 |
| PWR Sawmill Services Ltd | Agriculture & fishing | 2021 |
| Pylons OR Plough Limited | Other services | 2024 |
| Pyrmin Limited | Manufacturing | 2020 |
| Qu-Be Electrical & Renewable Limited | Construction | 2023 |
| Quality and Performance in Development Limited | Construction | 1997 |
| Quality Kitchens Co (Carmarthen) Ltd | Wholesale & retail | 2018 |
| Quayside Estates Ltd | Hospitality | 2022 |
| Quayside Orthodontics Ltd | Health & social care | 2011 |
| Queens Hotel Carmarthen Limited | Hospitality | 2026 |
| Quicksilver Jewellery Limited | Manufacturing | 2022 |
| Quota Management Services Ltd | Professional & scientific | 2002 |
| R & M Hardware & Agri Supplies Limited | Wholesale & retail | 2023 |
| R & R Recovery and Wellness Ltd | Health & social care | 2025 |
| R a Davies & Sons Plant Hire Ltd | Manufacturing | 2024 |
| R a Franks Limited | Transport & logistics | 2018 |
| R and HL Jones Holdings Limited | Financial services | 2024 |
| R B Brakes Limited | Wholesale & retail | 2025 |
| R D Richards Holdings Limited | Financial services | 2026 |
| R D Richards Investments Ltd | Real estate | 2021 |
| R D Richards Limited | Administrative & support | 2018 |
| R H and E S Lloyd Limited | Agriculture & fishing | 2004 |
| R H R Vehicle Body Repairs Limited | Wholesale & retail | 2011 |
| R P Cassidy Plumbing & Heating Ltd | Construction | 2013 |
| R&M Commercials Ltd | Wholesale & retail | 2026 |
| R. & A.J. Properties Limited | Professional & scientific | 2010 |
| R. & N. Thomas Limited | Agriculture & fishing | 2007 |
| R.E.P (West Wales) Limited | Agriculture & fishing | 2023 |
| R.G Fencing Limited | Administrative & support | 2001 |
| R.J.P. Engineering (Wales) Ltd | Real estate | 1995 |
| R.W.B. Developments Limited | Construction | 2000 |
| R10 Financial Ltd | Financial services | 2020 |
| R3 Processing Ltd | Real estate | 2024 |
| Racetracs Ltd | Information & communication | 2025 |
| Radical Controls Ltd | Manufacturing | 2003 |
| Rally Engineering Services Limited | Professional & scientific | 2020 |
| RAM Trucks(Uk) Limited | Wholesale & retail | 2018 |
| RAM Utility Group Ltd | Administrative & support | 2026 |
| RAP Construction Services Limited | Construction | 2005 |