| Tom's Pizza Ltd | Hospitality | 2024 |
| Tomadotte Investments Limited | Other services | 2023 |
| Tomilligan Ltd | Real estate | 2022 |
| Tomos & Lilford Holdings Limited | Manufacturing | 2015 |
| Top Tree CUT Surgery Limited | Agriculture & fishing | 2022 |
| Topstak Kitchens and Interiors Limited | Professional & scientific | 2015 |
| Topstak Limited | Wholesale & retail | 1999 |
| Torque Motors Limited | Wholesale & retail | 2002 |
| Totac Systems Limited | Professional & scientific | 1961 |
| Town & Country Collective Limited | Hospitality | 2022 |
| Town & Country Hotels Limited | Hospitality | 1997 |
| TPC Architectural Ltd | Construction | 2014 |
| TPC Glazing Ltd | Construction | 2014 |
| Tradingwaves Limited | Other services | 2025 |
| Traffic Consultancy (UK) Limited | Extraterritorial | 2021 |
| Treeworx Clothing Ltd | Wholesale & retail | 2025 |
| Tresimwn Limited | Professional & scientific | 2018 |
| Trivett Contracting Ltd | Construction | 2024 |
| True Potential Training Limited | Professional & scientific | 2024 |
| Tudor Garage (Ystradowen) Limited | Wholesale & retail | 1973 |
| Twcan Cyfyngedig | Real estate | 2012 |
| TWT Properties Limited | Real estate | 2021 |
| TY Laurel Limited | Construction | 2020 |
| Tyfu Coed Limited | Agriculture & fishing | 2025 |
| Tyndall Street Property Limited | Real estate | 2008 |
| U Drive Cars Limited | Administrative & support | 2001 |
| U-Test Diagnostics Ltd | Wholesale & retail | 2024 |
| UK Autoglaze Limited | Wholesale & retail | 2001 |
| UK Trading Academy Ltd | Financial services | 2014 |
| United Steel Tubes Ltd | Wholesale & retail | 2024 |
| Upvc Direct Ltd | Wholesale & retail | 2002 |
| Urban Recreation Ltd | Construction | 2026 |
| Uzuri Limited | Wholesale & retail | 2018 |
| Vadatelier Limited | Other services | 2014 |
| Vale 4 X 4 Limited | Real estate | 2003 |
| Vale Accountancy & Taxation Services Ltd | Professional & scientific | 2004 |
| Vale Business Services Ltd | Other services | 2024 |
| Vale Civils Ltd | Construction | 2011 |
| Vale ENT Limited | Health & social care | 2019 |
| Vale Farming & Services Limited | Agriculture & fishing | 1998 |
| Vale Gymnastics Limited | Arts & recreation | 2017 |
| Vale Infuse Ltd | Health & social care | 2023 |
| Vale Management Resourcing Limited | Administrative & support | 2006 |
| Vale Marketing Limited | Wholesale & retail | 2003 |
| Vale Menopause Ltd | Health & social care | 2024 |
| Vale Moto Ltd | Arts & recreation | 2014 |
| Vale Moto Training Ltd | Education | 2014 |
| Vale Motorcycles Ltd | Wholesale & retail | 2026 |
| Vale Mouldings Ltd | Wholesale & retail | 2024 |
| Vale Nourishment Ltd | Wholesale & retail | 2025 |
| Vale Occupational Health Ltd | Health & social care | 2021 |
| Vale of Glamorgan Developments Ltd | Real estate | 2024 |
| Vale Ornaments Limited | Wholesale & retail | 2023 |
| Vale Play Limited | Other services | 2019 |
| Vale Recruitment Solutions (Wales) Ltd | Other services | 2023 |
| Vale Skin Limited | Wholesale & retail | 2024 |
| Vale Storage Limited | Administrative & support | 2011 |
| Vale Timber Limited | Manufacturing | 2013 |
| Vale Wellness Academy Ltd | Education | 2025 |
| Vale Wellness Limited | Health & social care | 2023 |
| Vale Wills Ltd | Professional & scientific | 2020 |
| Valerie Ganz Productions Limited | Arts & recreation | 2002 |
| VCD Asset Management Limited | Real estate | 2018 |
| VCD DEL Guerra Limited | Real estate | 2023 |
| VCD Newtown Limited | Real estate | 2023 |
| VCD Two Developments Limited | Construction | 2020 |
| Veale IP Ltd | Professional & scientific | 2025 |
| Vedra Digital Ltd | Information & communication | 2026 |
| Vehicle Recapture Ltd | Wholesale & retail | 2025 |
| Ventura Air Solutions Limited | Manufacturing | 2025 |
| Venturi Property Ltd | Real estate | 2023 |
| Vermilion Sky Ltd | Wholesale & retail | 2024 |
| Vfin Limited | Professional & scientific | 2016 |
| Victoria Inn Sigingstone Ltd | Hospitality | 2014 |
| Vine Cottage Limited | Hospitality | 2023 |
| Virtualmdt Ltd | Professional & scientific | 2024 |
| Visolink Limited | Information & communication | 2023 |
| Vulpes Investments Ltd | Hospitality | 2022 |
| Vulpes Land and Property Ltd | Real estate | 2025 |
| W.C. & a. Durbin Limited | Real estate | 1973 |
| Wakely Investments Ltd | Real estate | 2017 |
| Wakely Properties LLP | | 2023 |
| Warren Farm Holidays Ltd | Hospitality | 2025 |
| Watts-Jones Holdings Limited | Financial services | 2021 |
| Waun Lark Enterprises Ltd | Real estate | 2025 |
| Wayne and Byron Davies Optometrists | Wholesale & retail | 1958 |
| WE ARE Redoo Ltd | Information & communication | 2017 |
| Wells Investments Limited | Financial services | 2008 |
| West Wales White Lining Limited | Extraterritorial | 2010 |
| Western Vale Properties Limited | Real estate | 2017 |
| Westgate Mews Limited | Households | 2001 |
| Wfamco Ltd | Health & social care | 2022 |
| Wick Contract Services Limited | Construction | 1998 |
| Wick Village Shop Limited | Wholesale & retail | 2012 |
| Wilcare Wales Limited | Manufacturing | 2001 |
| Wild and Fabulous Flowers Limited | Wholesale & retail | 2024 |
| Wild and Fabulous Weddings & Events Limited | Wholesale & retail | 2026 |
| Wild Meadow Property Ltd | Real estate | 2024 |
| William Jenkins Contractors Limited | Construction | 2005 |
| Willis Paintwork Ltd | Wholesale & retail | 2012 |