| Tai-Fab CYF | Manufacturing | 2020 |
| Tamne Associates Ltd | Information & communication | 2019 |
| Tech Writer Limited | Professional & scientific | 2022 |
| Thank YOU for Ltd | Wholesale & retail | 2020 |
| THE Gazelle, PUB, Restaurant & Rooms Ltd | Hospitality | 2020 |
| THE Life Channel Group Ltd | Information & communication | 2010 |
| THE Old Rectory Capital Investments Ltd. | Real estate | 2010 |
| THE Premier Group North Wales Ltd | Transport & logistics | 2021 |
| Tidygaff Limited | Information & communication | 2020 |
| Toebox App Ltd | Information & communication | 2025 |
| Tregarth Community Allotments C.I.C. | Agriculture & fishing | 2017 |
| TUI Solutions Ltd | Agriculture & fishing | 2006 |
| UK K9 Training for Excellence Limited | Professional & scientific | 2014 |
| UK Relocation Experts Ltd | Hospitality | 2023 |
| Utopia Salons Limited | Other services | 2002 |
| Vaynol Arms Limited | Households | 2021 |
| Venturehospitality Ltd | Hospitality | 2018 |
| W R Parry Slaters and Tilers Limited | Construction | 2005 |
| Wetherby Advisory Ltd | Professional & scientific | 2022 |
| Wildlife Care Badge Limited | Professional & scientific | 2023 |
| Xmile Electronics Ltd | Wholesale & retail | 2005 |
| Y Sgwâr MB Ltd | Hospitality | 2022 |
| Ynys Wyrion Ltd | Agriculture & fishing | 2025 |
| Yopan Stan Ltd | Hospitality | 2024 |
| York Design & Construction Limited | Arts & recreation | 1996 |
| Yumee Ltd | Hospitality | 2012 |