| Tiles Ahead Limited | Wholesale & retail | 2022 |
| Tintern Properties Limited | Real estate | 2014 |
| Tintern Residential Limited | Extraterritorial | 2014 |
| TKD Accountants Ltd | Professional & scientific | 2023 |
| Tlhm Limited | Wholesale & retail | 2021 |
| Tmda Services Ltd | Construction | 2022 |
| TOM Wysome Ltd | Health & social care | 2018 |
| Tommy's Cafe Ltd | Hospitality | 2022 |
| Top Scop Limited | Construction | 2025 |
| Toptees CYF | Wholesale & retail | 2025 |
| Torfaen Cars Ltd | Transport & logistics | 2026 |
| Torfaen Glazing Limited | Construction | 2011 |
| Torfaen Gold Trading Ltd | Wholesale & retail | 2018 |
| Torfaen Nurseries and Community Spaces Ltd | Education | 2022 |
| Torfaen Puffins Ltd | Arts & recreation | 2016 |
| Torfaen Squash Club Limited | Arts & recreation | 2023 |
| Torfaen Strategic Economic Forum Ltd | Health & social care | 2021 |
| Torfaen Tree Services Limited | Administrative & support | 2016 |
| Tovey Consulting Limited | Professional & scientific | 2016 |
| Towmater Ltd | Manufacturing | 2024 |
| Trade in Wales (Services) Limited | Administrative & support | 2024 |
| Trailblazers Accommodation Limited | Real estate | 2023 |
| Trailblazers Construction Limited | Construction | 2025 |
| Trailblazers Group Limited | Construction | 2023 |
| Trailblazers Properties Ltd | Real estate | 2023 |
| Tredegain Farm Retreat Limited | Agriculture & fishing | 2023 |
| Trendzhouse Limited | Real estate | 2022 |
| TRG Groundworks Civil Engineering Ltd | Construction | 2022 |
| Triple G Security Ltd | Administrative & support | 2023 |
| Triple Saith Ltd | Financial services | 2025 |
| Triumph Business Consultancy Ltd | Professional & scientific | 2024 |
| Trostrey Store Ltd | Wholesale & retail | 2017 |
| Truck Care South West Limited | Manufacturing | 2013 |
| TSG Maintenance Ltd | Administrative & support | 2025 |
| TSG Mechanical Limited | Construction | 2012 |
| TSL Heating & Plumbing Limited | Construction | 1998 |
| TSM Retail Ltd | Wholesale & retail | 2019 |
| Turca Recycle Ltd | Water & waste | 2025 |
| Turfmount Limited | Extraterritorial | 1962 |
| Turnleys Limited | Construction | 2009 |
| Tweenydale Park Developments Ltd | Real estate | 2018 |
| Twenty Four's Finest Limited | Financial services | 2026 |
| TWENTY14 Ltd | Construction | 2024 |
| Twisted LID Limited | Wholesale & retail | 2016 |
| Two Counties Creche C.I.C. | Health & social care | 1998 |
| TWP Engineering Limited | Professional & scientific | 2015 |
| TY Smart Properties Ltd | Real estate | 2023 |
| Tyfu Learning Ltd | Education | 2025 |
| Tywod Ltd | Hospitality | 2020 |
| TŶ Spa Ltd | Administrative & support | 2026 |
| Uddr Ltd | Information & communication | 2018 |
| UK Wood Business Ltd | Construction | 2021 |
| Ultra Bronze Limited | Other services | 2023 |
| Unhinged Windows and Doors Ltd | Construction | 2022 |
| Unhinged Windows and Plastics Limited | Wholesale & retail | 2023 |
| Unify Brand Partnerships Ltd | Wholesale & retail | 2007 |
| Union RGY Sportswear Ltd | Wholesale & retail | 2017 |
| Unit 6 Lakeside Limited | Other services | 2013 |
| United Scaffolding Cwmbran Ltd | Construction | 2021 |
| Unity Ventures Solutions Ltd | Administrative & support | 2023 |
| USK Farmers Club Limited | Other services | 1980 |
| USK RFC Limited | Arts & recreation | 2012 |
| USK RFC Property Limited | Arts & recreation | 2012 |
| USK Valley Limited | Manufacturing | 2012 |
| V J Thomas and SON Ltd | Agriculture & fishing | 2010 |
| Vale of USK Funeral Service Limited | Other services | 2016 |
| Valentines Food Ltd | Hospitality | 2025 |
| Van Helsing Limited | Information & communication | 1995 |
| Vanderbilt International (UK) Limited | Wholesale & retail | 2014 |
| Vantage Systems Group Ltd | Administrative & support | 2015 |
| Vantastic by BEX Ltd | Hospitality | 2021 |
| VAS Foods Limited | Hospitality | 2026 |
| Vector Air & Water Ltd | Professional & scientific | 2013 |
| Vedra Asset Management Limited | Real estate | 2024 |
| Vedra Property Group Limited | Real estate | 2023 |
| Vendotech UK Limited | Manufacturing | 2014 |
| Verati Design & Build Ltd | Construction | 2026 |
| Vibe Recruit Limited | Professional & scientific | 2018 |
| Villarrica Limited | Real estate | 2015 |
| Vincent-Butler Homes Ltd | Real estate | 2019 |
| Vinetree.Net Limited | Information & communication | 2002 |
| Virgo Care Homes Limited | Health & social care | 2009 |
| Vision Golf Ltd | Wholesale & retail | 2024 |
| Viva Bar Hire & Events Ltd | Administrative & support | 2025 |
| Volcke Aerosol Connection PLC | Manufacturing | 1996 |
| Volo Accounting Limited | Professional & scientific | 2024 |
| Volts Training and Specialist Services Ltd | Construction | 2024 |
| Voyage of Hope Therapy Services Limited | Education | 2020 |
| VSPUK1 Ltd | Wholesale & retail | 2021 |
| Vulcan Contractors Ltd | Construction | 2018 |
| Waah Ltd | Information & communication | 2019 |
| Wade & Wade Law Limited | Professional & scientific | 2022 |
| Wade & Wade LLP | | 2016 |
| Waggys Transport Ltd | Transport & logistics | 2020 |
| Wakeling Ceramic Wall & Floor Tiling Ltd | Construction | 2018 |
| Walden Steels Limited | Wholesale & retail | 2005 |
| Waldron Property Solutions Ltd | Real estate | 2025 |
| Wallace-Hillier Limited | | 1985 |
| Walls Autospray Limited | Wholesale & retail | 2025 |
| Wanderfoot Ltd | Information & communication | 2025 |