| Phoenix Plumb & FIX Ltd | Construction | 2021 |
| Phoenix Remapping Solutions Ltd | Wholesale & retail | 2024 |
| Phoenix-Auto-Solutions- Ltd | Wholesale & retail | 2020 |
| Photocolour (Wales) Limited | Professional & scientific | 1986 |
| Pigeon Pathways C.I.C. | Education | 2024 |
| Pinch Property Ltd | Extraterritorial | 2023 |
| Pitchford Tree Services Limited | Agriculture & fishing | 2020 |
| PJ Merthyr Tydfil Limited | Hospitality | 2015 |
| PK Couriers Ltd | Transport & logistics | 2018 |
| Pkrp Limited | Manufacturing | 2021 |
| Planet Play Merthyr Ltd | Arts & recreation | 2025 |
| Plas Coffi Limited | Hospitality | 2014 |
| Plasnewydd Residential Homes Limited | Health & social care | 1986 |
| Platinum Car Sales Ltd | Wholesale & retail | 2016 |
| Platinum Carpentry & Roofing Limited | Construction | 2025 |
| Platinum Property Investments and Management Ltd | Real estate | 2023 |
| Plumbvision Limited | Wholesale & retail | 2019 |
| PM8 Training & Support Services Ltd | Financial services | 2015 |
| Podgy's Pitstop Limited | Hospitality | 2025 |
| Podium Publications Limited | Information & communication | 1997 |
| Pompeo Limited | Administrative & support | 2021 |
| Pontmorlais Properties Limited | Real estate | 2016 |
| Pontmorlais Stores Ltd | Wholesale & retail | 2019 |
| Powell Scaffolding & Access Services Ltd | Construction | 2022 |
| Power Solutions Electrical Contractors Ltd | Construction | 2025 |
| Ppim Solutions UK Limited | Professional & scientific | 2022 |
| PPS Powder Coating Ltd | Manufacturing | 2011 |
| Precision Tints Ltd | Construction | 2025 |
| Price Home Developments Limited | Construction | 2023 |
| Price Pro-Construct Limited | Construction | 2020 |
| Prim Invest Limited | Real estate | 2024 |
| Print Evolution Limited | Manufacturing | 2003 |
| Prity Limited | Health & social care | 2023 |
| Productive Integration Limited | Information & communication | 2017 |
| Prolec Energy Solutions Ltd | Construction | 2022 |
| Prolec Properties Ltd | Real estate | 2025 |
| Prolec Security Systems Ltd | Administrative & support | 2024 |
| Prometheus Investment Sourcing Ltd | Real estate | 2025 |
| Proper Investment London Ltd | Real estate | 2024 |
| Property Type's Ltd | Real estate | 2025 |
| Property Valuations & Surveys Limited | Professional & scientific | 2007 |
| Protheroe and Sons Limited | Real estate | 2011 |
| PUB Recycling Limited | Education | 2019 |
| Pulman BIZ Ltd | Professional & scientific | 2018 |
| Punjab Province Properties Ltd | Real estate | 2019 |
| Pure Barbers Limited | Real estate | 2023 |
| Pure Barbers Merthyr Ltd | Other services | 2025 |
| Pure Class Limited | Transport & logistics | 2021 |
| Pure Class Storage Limited | Transport & logistics | 2021 |
| Pure Class Travel Limited | Transport & logistics | 2021 |
| QDL Contractors Limited | Construction | 2007 |
| QDL Finishes Limited | Real estate | 2017 |
| QDL Holdings Limited | Financial services | 2025 |
| Qmin (Ivor) Ltd | Hospitality | 2019 |
| Qmin (Merthyr) Ltd | Hospitality | 2025 |
| Quantiv Cost Consultants Ltd | Professional & scientific | 2024 |
| Quantum E Group Ltd | Wholesale & retail | 2023 |
| Quantum ES Limited | Manufacturing | 2008 |
| Quantum Inns Limited | Real estate | 1999 |
| Quinlan Property Developments Ltd | Real estate | 2025 |
| R & C Professional Services Limited | Professional & scientific | 2015 |
| R & J Donovan Ltd | Real estate | 2024 |
| R & R Homes Limited | Wholesale & retail | 2004 |
| R & S Property and Training Services Ltd | Education | 2014 |
| R Bowen Contracting Ltd | Construction | 2025 |
| R Harris Solutions Limited | Construction | 2014 |
| R Meredith Services Limited | Manufacturing | 2021 |
| R.O.K.S Distribution Ltd | Transport & logistics | 2024 |
| RAD Composites Limited | Manufacturing | 2022 |
| Radiant Black Ltd | Wholesale & retail | 2004 |
| Rainbow Therapeutic C Community Interest Company | Health & social care | 2026 |
| Rainbow Therapeutic Limited | Health & social care | 2013 |
| Ralph & Co Pet Products Limited | Wholesale & retail | 2015 |
| Ralph Rentals Ltd | Real estate | 2025 |
| Ralphys Holdings Limited | Financial services | 2014 |
| Ralphys Properties Limited | Real estate | 2014 |
| Ralphys Roofing Limited | Construction | 2005 |
| Rampys Construction Ltd | Construction | 2025 |
| Ran's Taxi Limited | Transport & logistics | 2023 |
| RAW Electrical Engineering Solutions Limited | Construction | 2018 |
| Rayles Rewinds Limited | Manufacturing | 2003 |
| Raynes Property Development Ltd | Real estate | 2020 |
| Raynes Scaffolding & Groundworks Ltd | Construction | 2014 |
| Razr Sports Limited | Arts & recreation | 2025 |
| RD Construction & Maintenance Ltd | Construction | 2018 |
| RE: Accounting Limited | Professional & scientific | 2020 |
| React Support Ltd | Transport & logistics | 2021 |
| Reaffect Ltd | Professional & scientific | 2023 |
| Real Trade Supplies Limited | Wholesale & retail | 2019 |
| Reardon Rail Ltd. | Construction | 2015 |
| Rebel Base Ltd | Professional & scientific | 2015 |
| Red Panda Tattoos Ltd | Other services | 2023 |
| Red Stage Media Ltd | Information & communication | 2012 |
| Redec Decorating Services Limited | Construction | 2003 |
| Redhouse Merthyr Tydfil Limited | Extraterritorial | 2014 |
| Redvio Care Ltd | Administrative & support | 2022 |
| Rees Electrical Solutions Ltd | Construction | 2019 |
| Refrigerated Trailer Services Limited | Manufacturing | 2008 |
| Registered Scheme Administrator Limited | Financial services | 2015 |
| Releaf Superfoods Ltd | Wholesale & retail | 2024 |