| THE Picking Taff's Ltd | Wholesale & retail | 2024 |
| THE Pink Lady Enterprises Limited | Arts & recreation | 2026 |
| THE Porthcawl PIG Limited | Hospitality | 2024 |
| THE Private Plate Company Limited | Wholesale & retail | 2008 |
| THE Skills Academy (Port Talbot) Ltd | Education | 2026 |
| THE Solution Factory Ltd | Professional & scientific | 2019 |
| THE South Wales Transport Preservation Group Ltd | Arts & recreation | 2016 |
| THE Strawberry HUT HR Ltd | Wholesale & retail | 2025 |
| THE Structural Survey Company Ltd | Professional & scientific | 2025 |
| THE Structure Studio Ltd | Professional & scientific | 2020 |
| THE Surge PUB Limited | Construction | 2015 |
| THE Victoria Road Limited Partnership | | 2012 |
| THE Welsh Gift and Craft Shop Limited | Wholesale & retail | 2008 |
| Therma-Fit a Rated Home Improvements Limited | Construction | 2013 |
| Thermalguard Consulting Ltd | Construction | 2018 |
| Thermalguard Ltd | Construction | 2018 |
| Thermiq Ltd | Construction | 2025 |
| Thirst Inn Ltd | Hospitality | 2018 |
| This IS Signature Limited | Other services | 2016 |
| Thomas & Co. Property Solutions Limited | Real estate | 2025 |
| Thomas and Thomas Solicitors Limited | Professional & scientific | 2008 |
| Thomas Group Holdings Limited | Real estate | 2002 |
| Thorneys Vintage Clothing Company Ltd | Wholesale & retail | 2025 |
| Thusky C.I.C. | Education | 2025 |
| Tian Tian Limited | Hospitality | 2019 |
| Tier One Real Estate Ltd | Real estate | 2025 |
| Tillzane Scaffolding Limited | Construction | 2015 |
| Timber Craft Solutions Ltd | Manufacturing | 2025 |
| Tiny Treasures Taibach Limited | Education | 2020 |
| TIP of the Spear Asset Management Ltd | Administrative & support | 2016 |
| TJ Holloway Engineering Ltd | Professional & scientific | 2025 |
| TK Nutrition Ltd | Wholesale & retail | 2026 |
| Tollgate Hardware Limited | Wholesale & retail | 2001 |
| Tomms Care Limited | Health & social care | 2010 |
| Tonmawr RFC Limited | Arts & recreation | 2025 |
| Top Nails 16 Ltd | Other services | 2025 |
| Tornado Studios Limited | Information & communication | 2002 |
| Total Ground Care Limited | Administrative & support | 2002 |
| Total Water Products Limited | Administrative & support | 2010 |
| Touching Hearts & Minds CIC | Health & social care | 2025 |
| Tour Fit Golf Limited | Wholesale & retail | 2021 |
| Trade Bay Frames Ltd | Construction | 2024 |
| Tradewave East Ltd | Wholesale & retail | 2024 |
| Trail Logic Ltd | Construction | 2026 |
| Transform Hair & Beauty PT Ltd | Other services | 2022 |
| Transformations Wales Ltd | Construction | 2006 |
| Transwales Ltd | Real estate | 2002 |
| Tree Line Trading Ltd | Agriculture & fishing | 2015 |
| Tree Safety Wales Ltd | Professional & scientific | 2023 |
| Trefelin Girls DC. Ltd | Arts & recreation | 2024 |
| Trial Balance Accounts Ltd | Professional & scientific | 2022 |
| Triggs Engineering Ltd | Professional & scientific | 2022 |
| Trimtastick Ltd | Wholesale & retail | 2023 |
| Triple H Property Co Ltd | Real estate | 2025 |
| Tritium Dental Laboratory Ltd | Health & social care | 2021 |
| Tropical Exotic Sea Foods (PVT) Ltd | Wholesale & retail | 2013 |
| True Connectors Limited | Administrative & support | 2022 |
| Tudor Mill Limited | Real estate | 1997 |
| Turkish Delight VA Ltd | Hospitality | 2025 |
| Turners Engineering Ltd | Energy | 2025 |
| Turning Tide Home Ltd | Wholesale & retail | 2025 |
| TWC Hire Limited | Administrative & support | 2023 |
| Twovend Leasing Limited | Administrative & support | 2019 |
| Ty'N Cellar Barns Ltd | Hospitality | 2014 |
| Ty-Draw Place (Port Talbot) Ltd | Construction | 2026 |
| Tyler Colin Anthony Limited | Wholesale & retail | 2015 |
| TYN Y TWR Tavern Limited | Hospitality | 2003 |
| Tyro Carpentry Ltd | Manufacturing | 2025 |
| Tystion Community Interest Company | Other services | 2026 |
| TŶ Hyfryd Limited | Real estate | 2025 |
| U & R Fitness Limited | Arts & recreation | 2017 |
| UK Business Shows Ltd | Professional & scientific | 2012 |
| UK Construction Shows Ltd | Administrative & support | 2018 |
| UK Fitness Management Ltd | Professional & scientific | 2025 |
| UK Retail Installers Limited | Construction | 2026 |
| Uluc Hairdressers Limited | Other services | 2020 |
| UPG Ltd | Real estate | 2020 |
| Urban Vogue Lounge Ltd | Real estate | 2024 |
| V.J. Bailey (Port Talbot) Limited | Wholesale & retail | 1965 |
| Vacanze Italiane Limited | Construction | 2017 |
| Vale Commercial Services Ltd | Transport & logistics | 2026 |
| Valley Consultancy Services Limited | Professional & scientific | 2025 |
| Valley View @ Bryn Bettws Limited | Hospitality | 2021 |
| Valley Walks K9 Care Ltd | Agriculture & fishing | 2021 |
| Van Value Limited | Wholesale & retail | 2002 |
| Vanguard Roofing & Cladding Ltd | Construction | 2015 |
| Vanguard Secure Ltd | Information & communication | 2023 |
| Vaoutreach Ltd | Professional & scientific | 2025 |
| Vargaconstruct Ltd | Construction | 2026 |
| Vaultkeep Ltd | Information & communication | 2026 |
| Veesu (SW) Limited | Other services | 2025 |
| Vega Nutritionals Limited | Wholesale & retail | 1997 |
| Veltech(Uk)Co. Ltd | Manufacturing | 2021 |
| Venlock Solutions Limited | Financial services | 2022 |
| Ventus VIA Ltd | Real estate | 2022 |
| Verano Surveys Limited | Professional & scientific | 2024 |
| Verywise Nutrition Ltd. | Wholesale & retail | 2004 |
| Vesopa Epos Ltd | Information & communication | 2024 |
| Veteran Owned UK Ltd | Administrative & support | 2018 |
| Victor&Gabi Ltd | Construction | 2014 |