| MJS5 Properties Ltd | Real estate | 2023 |
| MK UK Roofing Ltd | Construction | 2025 |
| MK44 Ltd | Hospitality | 2021 |
| MLS Electrical Limited | Construction | 2024 |
| Monarch Motors Transport & Recovery Ltd | Transport & logistics | 2025 |
| Moojoo Designs Limited | Manufacturing | 2019 |
| Moreish Candle Company Ltd | Manufacturing | 2024 |
| Motraining Limited | Professional & scientific | 2004 |
| Motun ATS Enterprise Group Ltd | Wholesale & retail | 2026 |
| Mouchak Indian Restaurant Limited | Hospitality | 2015 |
| MR Chippy Porth Ltd | Hospitality | 2025 |
| My V Locum Ltd | Administrative & support | 2024 |
| My VN Locum Ltd | Administrative & support | 2024 |
| N & N Civils Ltd | Construction | 2024 |
| N V R Services Limited | Water & waste | 2006 |
| N&Lconstruction Limited | Construction | 2019 |
| N.M Services (South Wales) Ltd | Construction | 2020 |
| NB Civils & Surfacing Ltd | Construction | 2010 |
| Next Turn Logistics Ltd | Transport & logistics | 2026 |
| Nexus Escapes Limited | Hospitality | 2026 |
| NG Leisure and Design Limited | Real estate | 2022 |
| Niya Infra Works Limited | Manufacturing | 2025 |
| NJ Rail Ltd | Construction | 2024 |
| NO Mercy Wrestling Event Production Ltd | Arts & recreation | 2021 |
| Occasions of Porth Ltd | Wholesale & retail | 2019 |
| OH! Nails Ltd | Other services | 2025 |
| Ojeb Enterprise Ltd | Wholesale & retail | 2026 |
| OJL Brickwork Rail Ltd | Construction | 2016 |
| ORA Chiropractic Limited | Health & social care | 2025 |
| Ormson Sports Ltd | Education | 2026 |
| Orphical Marketing Limited | Information & communication | 2025 |
| Osven Consulting Ltd | Professional & scientific | 2025 |
| Owen Connor Plant Ltd | Construction | 2018 |
| P Hill Engineering Ltd | Transport & logistics | 2015 |
| P J Webb Haulage Limited | Transport & logistics | 2007 |
| P&R Convenience Store Ltd | Wholesale & retail | 2022 |
| Parkland Property UK Limited | Real estate | 2017 |
| Parry Property Development Limited | Real estate | 2019 |
| Partneriaeth CWM Elai C.B.C | Education | 2019 |
| Pata Properties Ltd | Real estate | 2026 |
| PAW and Order Advocates C.I.C. | Health & social care | 2024 |
| Payfam Developers Ltd Ltd | Construction | 2025 |
| PEN and Paper Theatre Company CYF. | Arts & recreation | 2018 |
| Perfect Pout Ltd | Health & social care | 2019 |
| Persse Property Solutions Ltd | Real estate | 2024 |
| PGS Plant & Surfacing Ltd | Construction | 2019 |
| Phaze 1 Automotive Ltd | Extraterritorial | 2020 |
| Phixtura Limited | Manufacturing | 2023 |
| Phoenix Plant and Paving Limited | Administrative & support | 2025 |
| Phoenix Running South Wales Ltd | Arts & recreation | 2025 |
| Phones Station Limited | Wholesale & retail | 2021 |
| Phytofoam Limited | Manufacturing | 2023 |
| Phytoset Limited | Manufacturing | 2022 |
| Pickled EGG Consultancy Ltd | Information & communication | 2020 |
| Planet Murrain Co. Ltd | Hospitality | 2021 |
| Platinum Aesthetics 2023 Ltd | Health & social care | 2023 |
| Pobi Bach Bakery Ltd | Manufacturing | 2020 |
| Ponty Parc Caffi Ltd | Hospitality | 2026 |
| Poodilicious Pooche's Ltd | Other services | 2021 |
| Pool Hub Limited | Arts & recreation | 2026 |
| Popular Property Limited | Real estate | 2018 |
| Port Fish Bar Ltd | Hospitality | 2026 |
| Porth Barber Ltd | Other services | 2023 |
| Porth Catering Limited | Hospitality | 2025 |
| Porth Hall Limited | Real estate | 2024 |
| Porth Peri-Peri Limited | Hospitality | 2023 |
| Porth Takeaway Ltd | Hospitality | 2024 |
| PRB Transport Services Limited | Transport & logistics | 2016 |
| Premier Groundworks Solutions Ltd | Construction | 2014 |
| Private Care Dorchester Ltd | Health & social care | 2021 |
| Property Insiders Limited | Professional & scientific | 2019 |
| Property Insiders SPV 1 Limited | Real estate | 2020 |
| Property Insiders SPV2 Limited | Real estate | 2026 |
| Property Plus Wales Limited | Real estate | 2007 |
| Propertyrowesourcing Ltd | Real estate | 2024 |
| Pryma Padel Club Ltd | Arts & recreation | 2025 |
| PS Stores Limited | Wholesale & retail | 2012 |
| QM Logistics Ltd | Transport & logistics | 2025 |
| Quantum Brands Limited | Wholesale & retail | 2024 |
| Quantum Deco Limited | Health & social care | 2020 |
| Querndale Limited | Professional & scientific | 2016 |
| R Jones & SON Rail Tech Limited | Construction | 2017 |
| R. Davies DRY Lining Ltd | Construction | 2006 |
| RAJ Fresh Food Ltd | Hospitality | 2014 |
| RB Tonyrefail Ltd | Hospitality | 2023 |
| RCS Carpentry Services Ltd | Construction | 2023 |
| RCT Planning Consulting Ltd | Professional & scientific | 2021 |
| Red Valley Enterprises CIC | Hospitality | 2007 |
| Rees & Eaves Limited | Real estate | 2011 |
| Reli Property Development Ltd | Real estate | 2022 |
| REMEMBER2CARE CIC | Education | 2019 |
| Rethink Reuse Ltd | Wholesale & retail | 2024 |
| Reydesk Ltd | Information & communication | 2025 |
| Rhiwgarn Stores Limited | Wholesale & retail | 2012 |
| Rhondda Development Co Limited | Real estate | 1975 |
| Rhondda Eats Limited | Information & communication | 2021 |
| Rhondda Motor Company Limited | Wholesale & retail | 2012 |
| Rhondda Reef Ltd | Wholesale & retail | 2025 |
| Rhys Care Ltd | Health & social care | 2022 |
| Rhys Evans Construction Engineering Limited | Construction | 2006 |