| TRH Aerotech Limited | Manufacturing | 2018 |
| Trhtechnical Ltd | Professional & scientific | 2025 |
| Trigair Limited | Transport & logistics | 2007 |
| Trinity Care and Support | Health & social care | 2008 |
| Trueskin Studio Limited | Other services | 2025 |
| Truro Boatyard Limited | Real estate | 2008 |
| Turbo Pixel Limited | Professional & scientific | 2024 |
| Two FIN Limited | Hospitality | 2005 |
| TY Celyn Ltd | Financial services | 2022 |
| TY Ddraig Holdings Ltd | Real estate | 2022 |
| TY Elis Counselling Services | Health & social care | 2003 |
| TY Garth Consulting Limited | Professional & scientific | 2024 |
| Tylux Limited | Construction | 2016 |
| U.K. Funfairs Limited | Arts & recreation | 1998 |
| Urban Pooch Ltd | Wholesale & retail | 2014 |
| Uska Rocks Ltd | Professional & scientific | 2020 |
| Usmile Practice Ltd | Health & social care | 2020 |
| Vale Property Axarquía Limited | Real estate | 2025 |
| Vale Property Consultants Ltd | Professional & scientific | 2017 |
| Vange Aviation Limited | Manufacturing | 2016 |
| Vasari UK (London) Limited | Construction | 2021 |
| VB Industries Limited | Real estate | 2024 |
| Veheng Services Ltd | Professional & scientific | 2025 |
| Verano Engineering Ltd | Administrative & support | 2020 |
| Victoria Avenue Limited | Real estate | 2010 |
| Victorian Tiling Wales Ltd | Construction | 2013 |
| Vulcan Trading Ltd | Construction | 2024 |
| W & D Appliances Ltd | Administrative & support | 2021 |
| Walcroft Securities Limited | Wholesale & retail | 2004 |
| Walker Spinal Health Ltd | Health & social care | 2013 |
| Waters Edge (Apartments) Management Company Limited | Other services | 2007 |
| Waters Flowing Consultancy Limited | Professional & scientific | 2019 |
| Waterton Cross Management Limited | Real estate | 2006 |
| Watts Gregory LLP | | 2007 |
| Wayne Rogers Property Maintenance Ltd | Construction | 2008 |
| WBB Technical Services Ltd | Manufacturing | 2015 |
| Weird DOH Ltd | Hospitality | 2026 |
| Weird DOH Pizza Co Ltd | Hospitality | 2022 |
| Welsh Coast Marine Ltd | Manufacturing | 2025 |
| Westward HO Property Management Company Limited | Households | 2024 |
| Westwood Maison Investments Ltd | Financial services | 2023 |
| White Wheat Properties Ltd | Real estate | 2019 |
| Williams Aerotech Limited | Transport & logistics | 2011 |
| Williams and Brooke Limited | Real estate | 1957 |
| Winch Trade Profits Limited | Financial services | 2025 |
| Wizardz Wirez Ltd | Manufacturing | 2024 |
| WJE Contractors Ltd | Administrative & support | 2026 |
| Wright Aerotech Limited | Manufacturing | 2015 |
| Yabodesign Ltd. | Professional & scientific | 2015 |
| YGB Coaching Ltd | Professional & scientific | 2024 |
| Zero’S Bar Ltd | Hospitality | 2025 |
| ZL Engineering Ltd | Manufacturing | 2025 |
| ZM Plumbing & Heating Limited | Construction | 2018 |