| Morgan Civils and Drainage Ltd | Construction | 2024 |
| Morgan UK Finance Limited | Financial services | 2019 |
| MOT & Auto Centre Ltd | Wholesale & retail | 2021 |
| N Williams Limited | Professional & scientific | 2024 |
| Nabob Estates Ltd | Real estate | 2025 |
| Naturells Limited | Other services | 2007 |
| NCJ Drylining Ltd | Construction | 2018 |
| Nextgen CUE Sports Rhondda CIC | Arts & recreation | 2023 |
| NJ Electrical & SON Ltd | Construction | 2025 |
| NK1 Properties Limited | Real estate | 2024 |
| Norman Davies Industrial Flooring Specialists Ltd | Manufacturing | 1999 |
| OJ Barber Shops Limited | Other services | 2026 |
| One Solution Finance Limited | Professional & scientific | 2016 |
| Only Crumbs Cakes Limited | Wholesale & retail | 2024 |
| Onward Leisure Hotels Limited | Hospitality | 2020 |
| Onward Leisure Limited | Hospitality | 2013 |
| Onward Leisure PUB Group Ltd | Hospitality | 2018 |
| Onyxx Collective Group Limited | Real estate | 2026 |
| Onyxx Roofing & Solar Limited | Construction | 2025 |
| Origen Building and Property Renovations Ltd | Real estate | 2020 |
| Outline Land Solutions Limited | Construction | 2013 |
| PAY Monthly Websites Limited | Information & communication | 2022 |
| PB Roofing Ltd | Other services | 2018 |
| PBZ442 Ltd | Construction | 2026 |
| PC Brickworld Limited | Construction | 2007 |
| PEN Y Cymoedd Wind Farm Community Fund Community Interest Company | Other services | 2016 |
| PEP Cafe Limited | Hospitality | 2025 |
| Pepi Limited | Hospitality | 2017 |
| Pertho Limited | Financial services | 2024 |
| PFS Mortgages Ltd | Financial services | 2014 |
| Philip Warren Photography Ltd | Professional & scientific | 2022 |
| Phillips Roofing & Solar Ltd | Construction | 2016 |
| Pirus Electrical Ltd | Construction | 2016 |
| PPD Group Ltd | Real estate | 2021 |
| Premier Insulation & Building Treatments Limited | Construction | 2026 |
| Private Advisors Limited | Wholesale & retail | 2019 |
| Pro Renewable UK Ltd | Construction | 2023 |
| Property Key Ltd | Real estate | 2021 |
| R C T Construction & Maintenance Limited | Construction | 2016 |
| R Harris Project Management Services Limited | Professional & scientific | 2014 |
| R L Engineering Ltd | Manufacturing | 2007 |
| Raise Life Ltd | Wholesale & retail | 2024 |
| RCD Software Ltd | Information & communication | 2012 |
| RCT Safety Training Limited | Extraterritorial | 2017 |
| Real Windows Limited | Construction | 2004 |
| Red Dragon Limited | Wholesale & retail | 1998 |
| Red October Sun Ltd | Real estate | 2020 |
| RGS Rendering Systems Ltd | Construction | 2023 |
| Rhondda Chiropractic Limited | Health & social care | 2010 |
| Rhondda Damp-Proofing Limited | Professional & scientific | 1993 |
| Rhondda Osteopathic Clinic Ltd | Health & social care | 2014 |
| Rhondda Pride Ltd | Arts & recreation | 2019 |
| Rhondda Radio Ltd. | Information & communication | 2011 |
| Rhondda Trading Cards Ltd | Wholesale & retail | 2026 |
| Ribbons Limited | Manufacturing | 1985 |
| Rosser Homes Limited | Real estate | 2025 |
| Rvrepaircentre Ltd | Manufacturing | 2024 |
| S & C Warren Property Ltd | Households | 2024 |
| S&M Maintenance and Solutions Ltd | Construction | 2024 |
| SAI Arrow Retail Ltd | Wholesale & retail | 2016 |
| Salt and Smoke Catering Ltd | Hospitality | 2025 |
| SAM Drylining Limited | Construction | 2007 |
| SAM Holdings (RCT) Ltd | Financial services | 2021 |
| SAM Holdings (Treorchy) Limited | Financial services | 2016 |
| Sama Catering Ltd | Hospitality | 2022 |
| SAS Drylining Ltd | Construction | 2013 |
| Screen Tales Ltd | Information & communication | 2017 |
| Searle Properties Ltd | Real estate | 2018 |
| SEJ Roofing Ltd | Construction | 2023 |
| SGM Property & Hospitality Ltd | Hospitality | 2024 |
| Shangri Construction Ltd | Construction | 2023 |
| Shannath Pharma Consulting Limited | Professional & scientific | 2025 |
| Sharan Fish Bar Limited | Wholesale & retail | 2013 |
| Shift Together C.I.C. | Health & social care | 2022 |
| SJ Carpentry Services Limited | Construction | 2023 |
| SLE Locum Services Ltd | Wholesale & retail | 2022 |
| SND Internals Ltd | Construction | 2021 |
| Soliacco Limited | Real estate | 2020 |
| South Wales Vent Systems Ltd | Construction | 2022 |
| Stratton Developments & Maintenance Ltd | Construction | 2026 |
| Swansea Footgolf Limited | Arts & recreation | 2017 |
| Swill-I-Am Property Investments Limited | Real estate | 2020 |
| Symantha's Talking Therapy Limited | Health & social care | 2020 |
| Taff Developments Ltd | Real estate | 2021 |
| Taran Barnard Jones Holdings Limited | Financial services | 2021 |
| TDC Rail Ltd | Construction | 2017 |
| Tech Marvels Ltd | Wholesale & retail | 2019 |
| Tehuti Knowledge Services Limited | Professional & scientific | 2005 |
| TG Scaffolding (Pontypridd) Ltd | Construction | 2014 |
| Thames Computing Limited | Information & communication | 1995 |
| Thatchers MOT Centre Ltd | Wholesale & retail | 2019 |
| THE Barren Land Group Limited | Financial services | 2021 |
| THE Cheeky COW Rhondda Ltd | Hospitality | 2025 |
| THE COD on Gelli Ltd | Hospitality | 2026 |
| THE Good Property Buying Company Ltd | Real estate | 2020 |
| THE Good Property Holding Company Ltd | Real estate | 2020 |
| THE Lion Treorchy Limited | Hospitality | 2016 |
| THE Old Town Crier PUB Limited | Hospitality | 2023 |
| THE Pure Beauty Room Ltd | Other services | 2017 |
| THE Stag Rhondda Ltd | Hospitality | 2023 |