| THE Teleshore Group Limited | Financial services | 2023 |
| THE Training Office (TTO) Ltd | Other services | 2016 |
| THE Training Office Limited | Administrative & support | 2018 |
| Theandies Limited | Professional & scientific | 2019 |
| Theinfluencerpa Limited | Professional & scientific | 2023 |
| Thomas Family SW Ltd | Water & waste | 2025 |
| Tiwn Media Ltd | Professional & scientific | 2022 |
| TJB Waste Management Ltd | Water & waste | 2025 |
| TLC Brickwork Ltd | Construction | 2024 |
| TM JET Washing Limited | Administrative & support | 2024 |
| Tony Thomas Wealth Management Ltd | Professional & scientific | 2016 |
| Top Store Blackwood Limited | Wholesale & retail | 2026 |
| Topclass Travel UK Group Ltd | Other services | 2016 |
| Trace Building Services Ltd | Construction | 2022 |
| Trade Price Tyres Blackwood Limited | Wholesale & retail | 2025 |
| Transform Properties Ltd | Construction | 2020 |
| Transform Upvc Spraying Ltd | Construction | 2019 |
| Treowen Stores Limited | Wholesale & retail | 2026 |
| TRG Electrical Ltd | Construction | 2025 |
| Trinity Development Services Ltd | Construction | 2023 |
| Trump Associates Limited | Administrative & support | 2021 |
| Trydan Rail Ltd | Construction | 2023 |
| Turner & Harris Ltd | Households | 2022 |
| Turnkey Trading Limited | Manufacturing | 2009 |
| Twisted Chilli Limited | Other services | 2020 |
| TY CWM Cylla Workshop Ltd | Wholesale & retail | 2016 |
| TY Cwtch Limited | Health & social care | 2017 |
| TY Derw Properties Ltd | Real estate | 2021 |
| TY Melin Bakery Limited | Wholesale & retail | 2020 |
| TZ Trees and Landscaping Services Ltd | Agriculture & fishing | 2025 |
| Ultranyx Ltd | Information & communication | 2012 |
| Uncle BS Kitchen Ltd | Hospitality | 2024 |
| Unique Hair Team Ltd | Other services | 2025 |
| Unique Health & Fitness (2021) Limited | Arts & recreation | 2021 |
| Unique Training Academy Ltd | Education | 2023 |
| Urban Bourbon Ltd | Wholesale & retail | 2023 |
| Valley Hearing Ltd | Wholesale & retail | 2021 |
| Valley Medic Ltd | Extraterritorial | 2023 |
| Valley Properties & Maintenance Limited | Real estate | 2018 |
| Valley Property Developments Limited | Real estate | 2026 |
| Valley Tavern Limited | Hospitality | 2018 |
| Valley Taxis Limited | Transport & logistics | 2023 |
| Valley Utilities Limited | Construction | 2015 |
| Valley Water Services Limited | Construction | 2012 |
| Valleys Landscaping and Paving Ltd | Administrative & support | 2023 |
| Valleys Waste Services Ltd | Water & waste | 2021 |
| Vallini Limited | Arts & recreation | 2010 |
| Van Goffi Ltd | Hospitality | 2024 |
| Vann Edwards Facilities Management Ltd | Water & waste | 2022 |
| Vapehype Limited | Wholesale & retail | 2014 |
| VC Civil Engineering Limited | Professional & scientific | 2007 |
| Vehicle Installation Solutions Limited | Manufacturing | 2016 |
| Veywood Estates Ltd | Real estate | 2024 |
| Vibes Gym & Studio Ltd | Information & communication | 2016 |
| Vibrant Energy Matters Limited | Professional & scientific | 2008 |
| Viking Staffing and Events Limited | Hospitality | 2021 |
| Village People Limited | Health & social care | 2006 |
| Visible Development Ltd | Other services | 2021 |
| VKY Realty Ltd | Professional & scientific | 2023 |
| Volks Solutions Ltd | Wholesale & retail | 2025 |
| Vulcan Pro Safety Ltd | Professional & scientific | 2023 |
| Wales and West Spray Rendering Ltd | Construction | 2020 |
| Washroom & Water Facilities Ltd | Manufacturing | 2024 |
| Water Mains Sterilizing Utility Limited | Water & waste | 2005 |
| Waters INV. Limited | Financial services | 2021 |
| WDK Nails Limited | Other services | 2023 |
| WE Care Communications Limited | Information & communication | 2022 |
| Wealth & Fortune Limited | Hospitality | 2020 |
| Weightless Ltd | Other services | 2025 |
| Welsh Oak Groundworks and Landscaping Ltd | Construction | 2024 |
| Whitehall Property Developments Limited | Real estate | 2014 |
| Wicked Candle Company Limited | Manufacturing | 2021 |
| Wild Auto Enterprise Ltd | Wholesale & retail | 2025 |
| Will Will DO IT Ltd | Construction | 2025 |
| Winter Engineering Ltd | Manufacturing | 2024 |
| Wise Wealth Management Limited | Professional & scientific | 2020 |
| With Love, Abigail X Ltd | Wholesale & retail | 2020 |
| Wizards of Waste Ltd | Water & waste | 2025 |
| WOC Consultant Limited | Professional & scientific | 2022 |
| Woodcraft Wales Limited | Construction | 2006 |
| Words YOU CAN USE Limited | Other services | 2016 |
| World Access Travel Ltd | Administrative & support | 2023 |
| Worthing Clinical Coding Ltd | Health & social care | 2023 |
| Wrappetite Limited | Hospitality | 2026 |
| WT Sprinkler Division Ltd | Construction | 2025 |
| WYE Valley Consulting Limited | Professional & scientific | 2013 |
| X-Chargers UK Limited | Construction | 2024 |
| Xposier Ltd | Wholesale & retail | 2024 |
| Yummies BW Ltd | Hospitality | 2026 |
| Yummies FDL Limited | Hospitality | 2019 |
| ZA Financial Ltd | Financial services | 2023 |
| ZET Construction Ltd | Construction | 2026 |
| Zeus Nightclub Ltd | Hospitality | 2021 |