| Rhian Rees CYF | Agriculture & fishing | 2005 |
| Rnlvs Limited | Professional & scientific | 2019 |
| Rnoh Ltd | Wholesale & retail | 2021 |
| Shell on Earth Limited | Manufacturing | 2020 |
| Siddalls Holdings Limited | Real estate | 1964 |
| Splendid Products Ltd | Wholesale & retail | 2002 |
| Steve's Window Designs Limited | Wholesale & retail | 2006 |
| Teifi Furniture Limited | Wholesale & retail | 2006 |
| Teifi Law Limited | Professional & scientific | 2006 |
| Terraqua Ecological Services Ltd | Professional & scientific | 2012 |
| THE JEN Jones Welsh Quilt Centre | Arts & recreation | 2004 |
| Theatr Mwldan | Arts & recreation | 1992 |
| Theatr Mwldan Media Developments Limited | Real estate | 2003 |
| Thomas Bros Fabrication Ltd | Manufacturing | 2002 |
| Thomas Spar Limited | Wholesale & retail | 2003 |
| TM Surveyors Ltd | Other services | 2024 |
| TTS (Wales) Limited | Manufacturing | 2014 |
| U Facilities Management Limited | Construction | 2017 |
| Vale of Rheidol Railway Limited | Transport & logistics | 1987 |
| Vehicles on Display Limited | Wholesale & retail | 2019 |
| W.T. Davies & Co. CYF | Agriculture & fishing | 2006 |
| Waltham Shutter Door Services Limited | Construction | 2009 |
| Wavehill EOT Trustee Limited | Professional & scientific | 2020 |
| Way OUT Events Ltd | Arts & recreation | 2012 |
| Welsh Pony and COB Society (the) | Arts & recreation | 1971 |
| Wild Welsh Treehouses Limited | Hospitality | 2025 |
| Williams Trow Studio Ltd | Professional & scientific | 2023 |
| Ynni Engineering Ltd | Professional & scientific | 2020 |