| Tommy's Taxis Ltd | Transport & logistics | 2023 |
| TON Tyres Limited | Wholesale & retail | 2025 |
| Tonyrefail & District Chamber of Trade Ltd | Administrative & support | 2025 |
| Tonyrefail Music Limited | Wholesale & retail | 2018 |
| Tonyrefail Properties Ltd | Real estate | 2025 |
| Tonyrefail RFC Limited | Arts & recreation | 2021 |
| Tonyrefail Roofing Limited | Construction | 2019 |
| Toogoodtowaste Limited | Water & waste | 1996 |
| Top DIY Tools Limited | Wholesale & retail | 2019 |
| Tradeframe AI Ltd | Information & communication | 2026 |
| Trail & Tails Ltd | Other services | 2023 |
| Travelsmith Cornwall Limited | Professional & scientific | 2006 |
| Travelsmith Holidays Limited | Hospitality | 2006 |
| Travelsmith Investments Limited | Professional & scientific | 1998 |
| Travelsmith Leisure Limited | Professional & scientific | 2017 |
| Trejesinit Ltd | Health & social care | 2022 |
| Tremor Events Ltd | Manufacturing | 2025 |
| TRI Nations Darts Ltd | Arts & recreation | 2020 |
| Trustbynature Limited | Information & communication | 2025 |
| Tucker & Sons Builders Ltd | Construction | 2025 |
| Tworeeses Limited | Real estate | 2026 |
| Ty-Fry Ltd. | Agriculture & fishing | 2022 |
| Tycoon Equities Limited | Administrative & support | 2023 |
| Unique Utilities Ltd | Construction | 2025 |
| Urban Markets and Events Ltd | Administrative & support | 2022 |
| Valley Marketing Group Limited | Professional & scientific | 2016 |
| Valley's Community Care Ltd | Health & social care | 2025 |
| Valley-Clad Ltd | Construction | 2018 |
| Valleys Creative Ltd | Arts & recreation | 2012 |
| Valleys Kids | Education | 1999 |
| Van Every Properties Limited | Real estate | 2015 |
| Vape Land Porth Ltd | Wholesale & retail | 2024 |
| Vaporiyum Ltd | Wholesale & retail | 2024 |
| Vayunandan Ltd | Hospitality | 2024 |
| VEE Logistics Ltd | Transport & logistics | 2025 |
| Vertice Services Limited | Construction | 2025 |
| Vogue Hair Salon Limited | Other services | 2001 |
| VR Gupta Enterprises Limited | Manufacturing | 2026 |
| Webhooks Ltd | Information & communication | 2025 |
| WEI Shen Limited | Hospitality | 2022 |
| Welcome Kitchens Ltd | Wholesale & retail | 2019 |
| Welsh Black Wales Limited | Agriculture & fishing | 2009 |
| West London Holdings & Securities Limited | Real estate | 2015 |
| Whisks and Wonders Ltd | Manufacturing | 2025 |
| Wildtails LLP | | 2022 |
| Wills Property Developments Limited | Construction | 2025 |
| Winmay Limited | Health & social care | 2014 |
| Wishful House Ltd | Hospitality | 2018 |
| Wood Social Care Assessments Ltd | Health & social care | 2022 |
| Woodlands Green (Coedely) Management Company Limited | Households | 2021 |
| Wrons Limited | Wholesale & retail | 2022 |
| WW Installations Ltd | Construction | 2022 |
| Xarrow Travel Limited | Transport & logistics | 2015 |
| Xavier Design Limited | Professional & scientific | 2024 |
| Xeenia Ltd | Wholesale & retail | 2025 |
| Yazoo Pizza Ltd | Hospitality | 2025 |
| Yifeng (Trading) Limited | Hospitality | 2019 |
| Yifeng Limited | Real estate | 2019 |
| Ying Kitchen Ltd | Hospitality | 2023 |
| Your Care Your Way Ltd | Health & social care | 2020 |
| YS Convenience Store Ltd | Wholesale & retail | 2024 |
| Zana Car Wash Ltd | Administrative & support | 2025 |
| Zcjc Couriers Ltd | Transport & logistics | 2016 |
| Zebra Property Investments Ltd | Real estate | 2025 |
| ZKL Utility Ltd | Energy | 2026 |
| Zyra Finance Limited | Professional & scientific | 2017 |