| Plane Management Systems Limited | Professional & scientific | 2024 |
| Platinum Energy Limited | Construction | 2023 |
| Pleasure Food Ltd | Hospitality | 2019 |
| PLH Limited | Professional & scientific | 2010 |
| PLH Scaffolding and Eco Consultants Ltd | Construction | 2024 |
| PLU a Phlanhigion CYF | Education | 2025 |
| PMC Services (Wales & West) Limited | Construction | 2018 |
| Point 2 Point Roofing & Building Ltd | Construction | 2023 |
| Polestone Support Ltd | Health & social care | 2012 |
| Polyblox Limited | | 1983 |
| Pontardawe Air Movements Limited | Construction | 2009 |
| POP UP Pizzeria Limited | Hospitality | 2025 |
| Port Talbot Funeral Services Limited | Other services | 2016 |
| Portal Electrical Limited | Construction | 2016 |
| Portland Search Ltd | Administrative & support | 2026 |
| Positive People Blossom Limited | Professional & scientific | 2024 |
| Power Spark Solutions Ltd | Construction | 2024 |
| Premier Groundworks and Landscapes Ltd | Administrative & support | 2011 |
| Premier Properties (GB) Limited | Real estate | 1999 |
| Premier Welsh Blinds Limited | Construction | 2023 |
| Premises Plus Ltd | Information & communication | 2025 |
| Present Past Ltd | Wholesale & retail | 2023 |
| Presidential Roofing Limited | Construction | 2022 |
| Prestige Building & Carpentry Limited | Manufacturing | 2023 |
| Prestige Professional Cleaning Services Ltd | Administrative & support | 2015 |
| Prestige Pups Limited | Agriculture & fishing | 2020 |
| Prestige Salon Supplies Limited | Wholesale & retail | 2002 |
| Price Lifting Services Limited | Construction | 2014 |
| Prima Property and Lettings Limited | Real estate | 2017 |
| Prima Vista Musikk Limited | Administrative & support | 2002 |
| Prime Financial Solutions and Mortgages Limited | Financial services | 2017 |
| Primescan Ltd | Health & social care | 2025 |
| Pristine Developments Limited | Construction | 2018 |
| Prizmo Competitions Ltd | Arts & recreation | 2025 |
| PRL Property Holdings Ltd | Real estate | 2026 |
| Pro Weld 23 Ltd | Manufacturing | 2023 |
| Pro-Tec Autos Ltd | Wholesale & retail | 2025 |
| Probert Law Limited | Professional & scientific | 2014 |
| Productive Business Solutions Ltd | Other services | 2013 |
| Programmatica Limited | Professional & scientific | 1997 |
| Promotional Focus (South Wales) Limited | Professional & scientific | 1993 |
| Prop & Centre Group Ltd | Administrative & support | 2023 |
| Properties by LJ Ltd | Real estate | 2025 |
| Property Friends Group Ltd | Real estate | 2024 |
| Property Harmony Ltd | Real estate | 2014 |
| Property-Ping Ltd | Information & communication | 2023 |
| Propertyproudcleaning Ltd | Administrative & support | 2026 |
| Propest Ltd | Administrative & support | 2020 |
| Proskim Ltd | Construction | 2016 |
| Prs-Wales Limited | Manufacturing | 2025 |
| Pulse Safety Band Ltd | Manufacturing | 2025 |
| Pursuit Fitness Ltd | Wholesale & retail | 2026 |
| Pushclue Limited | Information & communication | 1999 |
| PVR Trading Ltd | Wholesale & retail | 2023 |
| PXJ Consulting Limited | Professional & scientific | 2009 |
| Q&B Nails Ltd | Other services | 2025 |
| Q-Ube Bar Limited | Hospitality | 2024 |
| QS SAK Limited | Professional & scientific | 2018 |
| QSG Studios Ltd | Arts & recreation | 2021 |
| Quality Refurbishment Specialists Limited | Construction | 2018 |
| Quarry Face Adventures Ltd | Arts & recreation | 2018 |
| Quartzize Ltd | Wholesale & retail | 2016 |
| Quartzize Worktops Ltd | Manufacturing | 2018 |
| Quays Security, Events & K9 Ltd | Financial services | 2025 |
| R & D Ventilation Systems Limited | Manufacturing | 1995 |
| R & M Williams (Holdings) Limited | Financial services | 2003 |
| R & M Williams Energy & Fabric Limited | Construction | 2026 |
| R & M Williams Group Limited | Financial services | 2026 |
| R & M Williams Limited | Construction | 1978 |
| R and S Home Developments Ltd | Construction | 2024 |
| R E Bowden Ltd | Real estate | 2025 |
| R Hair Salon Ltd | Other services | 2025 |
| R K Late Shop Ltd | Wholesale & retail | 2013 |
| R K Property and Ground Services Ltd | Administrative & support | 2023 |
| R P Fish Trading Ltd | Agriculture & fishing | 2021 |
| R Williams Transport Ltd | Transport & logistics | 2021 |
| R&Ad Pudz Ltd | Hospitality | 2026 |
| R&R Waterblock Ltd | Construction | 2018 |
| R.O. Parks (Hirwaun) Limited | Wholesale & retail | 1965 |
| R.O.S. Medics Limited | Health & social care | 2013 |
| R.T.W Planning Services Limited | Other services | 2018 |
| R08 Mech Ltd | Construction | 2026 |
| Rabid Raccoon Limited | Information & communication | 2024 |
| RAC Industries Limited | Real estate | 2026 |
| Radcreates Ltd | Manufacturing | 2024 |
| RAM Physio Care Ltd | Health & social care | 2026 |
| Rana Darwish Limited | Professional & scientific | 2011 |
| Randall & Daniels (Electrical) Limited | Construction | 1961 |
| RAY Hulmes Associates Limited | Professional & scientific | 2004 |
| RCH Resolve Ltd | Manufacturing | 2020 |
| RCJ Heating Limited | Construction | 2022 |
| RCJ Properties SW Limited | Real estate | 2025 |
| RCM Developments Limited | | 1988 |
| RD Partners Ltd | Wholesale & retail | 2012 |
| RD Risk Control Ltd | Mining & quarrying | 2025 |
| RDB Eco Heat Ltd | Construction | 2020 |
| RDD Solutions Limited | Financial services | 2010 |
| RDM Environmental Ltd | Other services | 2018 |
| RDM Fabrications (Neath) Ltd | Professional & scientific | 2016 |
| RDW Services Limited | Professional & scientific | 2015 |