| THE View Luxury Glamping Ltd | Hospitality | 2022 |
| THE Welsh Sausage Company Limited | Manufacturing | 2002 |
| THE Wright Taxis Limited | Transport & logistics | 2008 |
| Theholly&Thetiny Ltd | Arts & recreation | 2024 |
| Thornbury Farms Ltd | Agriculture & fishing | 2022 |
| Threesixty Holdco 4 Limited | Financial services | 2020 |
| Threesixty Holdco 9 Limited | Financial services | 2023 |
| Threesixty Investco 4 Limited | Financial services | 2021 |
| TOM Lewis Contracting Limited | Agriculture & fishing | 2013 |
| Torq Holdings Limited | Professional & scientific | 2009 |
| Torq Limited | Wholesale & retail | 2000 |
| TPV Logistics & Co Ltd | Transport & logistics | 2026 |
| Trafford Gateway Empress Mill Limited | Real estate | 2022 |
| Trailhead Active Snacks Limited | Extraterritorial | 2016 |
| Trailhead Fine Foods Limited | Manufacturing | 2016 |
| Transcriptors Limited | Manufacturing | 2013 |
| Transformetrics Ltd. | Professional & scientific | 2014 |
| Trefaldwyn Cheese Ltd | Manufacturing | 2019 |
| Tremeirian Limited | Extraterritorial | 2014 |
| Trener Erwin Ltd | Health & social care | 2025 |
| TRG Properties Limited | Real estate | 2012 |
| Tridynion Ltd | Agriculture & fishing | 2021 |
| Trimwright Homes Limited | Construction | 2014 |
| Tsss Ltd | Arts & recreation | 2026 |
| Turnbulls Refrigeration Limited | Extraterritorial | 1995 |
| Twin Ayre Country Park Limited | Hospitality | 2024 |
| Two Lions Welsphool Limited | Hospitality | 2025 |
| TY Cefn Ltd | Construction | 2015 |
| Tyler Edwards Limited | Real estate | 2020 |
| UN Pied SUR Terre Limited | Transport & logistics | 1998 |
| UNIQUE21 Salons Limited | Other services | 2021 |
| Unitec Services Limited | Construction | 2021 |
| Untangling Group Limited | Information & communication | 2024 |
| Valley View Limited | Real estate | 2015 |
| Vertigo Rope Access Services Ltd | Administrative & support | 2013 |
| Vickers Tree Surgery & Arboricultural Services Ltd | Extraterritorial | 2020 |
| Victoria Knowles-Lacks Ltd | Administrative & support | 2015 |
| Vidar Projects LLP | | 2018 |
| W a Evans Ltd | Real estate | 2023 |
| WCO Ltd | Professional & scientific | 2014 |
| Webpower Limited | Information & communication | 1997 |
| Welshpool Holdings Limited | Financial services | 2009 |
| Welshpool Livestock Sales Limited | Wholesale & retail | 2009 |
| Welshpool Town Football Club C.B.C. | Arts & recreation | 2022 |
| West Family Holdings Ltd | Financial services | 2021 |
| West Wales 2000 Limited | Agriculture & fishing | 1984 |
| WHC Accomodation Limited | Real estate | 2024 |
| White House Holiday Rentals Ltd | Extraterritorial | 2020 |
| Wild Sleep Tape Ltd | Wholesale & retail | 2024 |
| Will Alston Consultancy Ltd | Professional & scientific | 2025 |
| Williams & Morrow Limited | Real estate | 1995 |
| Willow Leaf Gifts Limited | Wholesale & retail | 2019 |
| Wipak UK Limited | Manufacturing | 1976 |
| Wonderwool Wales Ltd | Arts & recreation | 2007 |
| Woodtek Biomass Limited | Manufacturing | 2013 |
| Woodtek Engineering Limited | Manufacturing | 2019 |
| Wootton Tree Services Limited | Agriculture & fishing | 2014 |
| WPG Holdings Limited | Professional & scientific | 2013 |
| WPG Limited | Manufacturing | 1991 |
| Wpool Kebabs Ltd | Hospitality | 2026 |
| Wright & Jones Holdings Ltd | Financial services | 2009 |
| Wright Computing Ltd | Information & communication | 2018 |
| X-Floc Ltd | Wholesale & retail | 2013 |
| Yarwood Events Limited | Hospitality | 2014 |
| Yewnique Ltd | Manufacturing | 2025 |
| Yorton Limited | Agriculture & fishing | 2021 |
| Your-Crowd Ltd | Administrative & support | 2023 |
| YR Eifl Limited | Professional & scientific | 2025 |
| Ysgol Feithrin Y Trallwng Ltd | Education | 2011 |
| Zip-Clip Group Limited | Financial services | 2021 |
| Zip-Clip International Limited | Manufacturing | 2023 |
| Zip-Clip Ltd | Manufacturing | 2004 |