| THE Red Lion Enterprise Ltd | Hospitality | 2024 |
| THE Red Lion Experience Ltd | Hospitality | 2019 |
| THE Red Lion Herefordshire Limited | Hospitality | 2018 |
| THE Reptile Residence Ltd | Wholesale & retail | 2023 |
| THE Robin Hood (Castlemorton) Limited | Hospitality | 2013 |
| THE Ship & Castle Ltd | Hospitality | 2016 |
| THE Social Gaming Group Limited | Wholesale & retail | 2016 |
| THE Society of ST Sulien | Other services | 2016 |
| THE ST Clears Joinery Company Limited | Manufacturing | 2017 |
| THE Volcanic Chimney Company Limited | Construction | 2002 |
| THE Waters Working Ltd | Agriculture & fishing | 2022 |
| THE Welsh School of Homoeopathy Limited | Education | 1999 |
| THE Wheaten Sheaf Limited | Hospitality | 2025 |
| THE Zensory Hub Limited | Arts & recreation | 2023 |
| Thebocs Events Ltd | Arts & recreation | 2025 |
| Thel Group Limited | Hospitality | 2019 |
| Therapy Dog Training UK Ltd | Education | 2023 |
| Thomas Allan Group Limited | Administrative & support | 2024 |
| Thomas Brown Associates Limited | Real estate | 1998 |
| Thomas Development Group Ltd | Construction | 2023 |
| Thomas Ecology and ARB Ltd | Professional & scientific | 2023 |
| Thomas Groundwork’S Limited | Construction | 2020 |
| Thomas Ryan Gethin Thomas Ltd | Extraterritorial | 2022 |
| Thomaspharma Ltd | Financial services | 2025 |
| Thorne Staffing Solutions Ltd | Administrative & support | 2023 |
| Thorning Farm Glamping & Camping Ltd | Hospitality | 2021 |
| Thornmaster Limited | Professional & scientific | 2015 |
| Thornton Electrical Services Limited | Construction | 2021 |
| Thoroughbrand Digital Ltd | Professional & scientific | 2019 |
| Three Mariners Limited | Hospitality | 2021 |
| Three Mills Service Centre Limited | Wholesale & retail | 2022 |
| Throbak Consultants Limited | Information & communication | 2018 |
| Tierson Farms Limited | Agriculture & fishing | 2002 |
| Tiger Clothing Ltd | Wholesale & retail | 2024 |
| Timber Tents Limited | Construction | 2016 |
| Timberman Limited | Wholesale & retail | 2002 |
| Time for YOU West Wales Ltd | Administrative & support | 2021 |
| TIN CAN Retreat Ltd | Hospitality | 2022 |
| Tiny Stays Ltd | Hospitality | 2026 |
| Tips 7 Limited | Other services | 2012 |
| Tips 7 Properties Ltd | Administrative & support | 2016 |
| Tirimi Ltd | Manufacturing | 2019 |
| Tivy Vets Ltd | Professional & scientific | 2024 |
| Tlec Electrical Contractors Limited | Construction | 2024 |
| TMS Resources PC | | 2019 |
| Tobias Training Systems Ltd | Education | 2025 |
| Todd Properties Ltd | Real estate | 2025 |
| Together Platforms Ltd | Professional & scientific | 2012 |
| Togetherbetter Collaborative Consultancy Ltd | Professional & scientific | 2020 |
| Tomasz Szymacha Ltd | Construction | 2017 |
| Tomos Rees Motor Repairs Limited | Wholesale & retail | 2015 |
| Tony Jones Architectural Design Ltd | Professional & scientific | 2008 |
| Toriad Dhar Ltd | Other services | 2021 |
| Touts Limited | Wholesale & retail | 1995 |
| Tovali Limited | Manufacturing | 1958 |
| Towy Community Church | Health & social care | 2010 |
| Towy Construction Ltd | Construction | 2020 |
| Towy Engineering Ltd | Manufacturing | 2024 |
| Towy Estates Ltd | Real estate | 2026 |
| Towy Haven Care Homes Limited | Health & social care | 2000 |
| Towy Home Rentals Ltd | Real estate | 2020 |
| Towy Oaks Properties Ltd | Real estate | 2026 |
| Towy Roofing Ltd | Construction | 2025 |
| Towy Side Properties Limited | Real estate | 2015 |
| Towy Sports Bar Limited | Arts & recreation | 2024 |
| Towy Works Limited | Wholesale & retail | 1906 |
| Towyvision Ltd | Information & communication | 2018 |
| TPH Hire Ltd | Construction | 2023 |
| Trace Element Services Limited | Agriculture & fishing | 1982 |
| Trafelyrych Limited | Agriculture & fishing | 2004 |
| Traffic Management Design Wales Ltd | Administrative & support | 2018 |
| Train and Treat Limited | Wholesale & retail | 2025 |
| Trannon Valley Poultry Ltd | Agriculture & fishing | 2022 |
| Transformerpreneur.Com Ltd | Information & communication | 2009 |
| Transmeta Solutions Limited | Professional & scientific | 2008 |
| Travellers Well Limited | Hospitality | 2014 |
| Treale Farm Limited | Agriculture & fishing | 2006 |
| Trebersed Farms Ltd | Agriculture & fishing | 2014 |
| Trefhedyn Garden Centre Ltd | Wholesale & retail | 2002 |
| Tregni Ltd | Information & communication | 2005 |
| Tregoyd Mountain Riders Limited | Arts & recreation | 2025 |
| Tregroes and District Village Hall, Neuadd Tregroes A'R Cylch | Other services | 2009 |
| Tremellen Farms Limited | Agriculture & fishing | 2001 |
| Trenewydd Kennels Ltd | Administrative & support | 2021 |
| Trenoeth Farm Campsite Ltd | Hospitality | 2021 |
| Tribe Joinery Limited | Manufacturing | 2024 |
| Trident Crisis Management Limited | Administrative & support | 2023 |
| Trimaster Investments Limited | Financial services | 2016 |
| Trinity University College | Education | 1995 |
| Triol Bach Renewables Ltd | Energy | 2015 |
| TRM Power Clean Limited | Administrative & support | 2019 |
| Troedybryn Flats Management Company Limited | Households | 1990 |
| Trojan Equine Limited | Agriculture & fishing | 2002 |
| Tropos Drone Services Ltd | Agriculture & fishing | 2025 |
| Trostre Cabs Limited | Transport & logistics | 2024 |
| Trouble Decker Limited | Administrative & support | 2020 |
| Trumor International Steel Limited | Administrative & support | 1987 |
| Trydan Electrical Services Limited | Construction | 2010 |
| Trysor Jewellery Limited | Wholesale & retail | 2007 |
| TS Custom Builds Limited | Real estate | 2017 |