| Troserch Woodland (Property) Limited | Agriculture & fishing | 2006 |
| Trostre Parc Car Sales Limited | Wholesale & retail | 2023 |
| Trostre Self Storage Ltd | Administrative & support | 2015 |
| Trucker 4 Hire Ltd | Administrative & support | 2018 |
| Trucut Carpentry Services Ltd | Manufacturing | 2014 |
| Trun Style Llan Ltd | Hospitality | 2026 |
| Trunkstock Limited | Real estate | 2002 |
| Tudur Jones CYF | Administrative & support | 2007 |
| Tuesday Howells Ltd | Arts & recreation | 2023 |
| TUF Treads (Dyfed) Limited | Wholesale & retail | 1979 |
| TUF Treads Factory Limited | Construction | 2023 |
| Tumble Forge Limited | Manufacturing | 2003 |
| Tumble Lindy HOP Jive CIC | Arts & recreation | 2023 |
| Turn Another Page Ltd | Wholesale & retail | 2024 |
| TV21 Limited | Information & communication | 1989 |
| TVC Media Limited | Information & communication | 2005 |
| Tweaker Media Services Limited | Information & communication | 2001 |
| Twiddleys Limited | Manufacturing | 2006 |
| Twmboy Limited | Education | 2025 |
| Two CAN Properties & Estates Limited | Real estate | 2022 |
| TX Protective Coatings Limited | Agriculture & fishing | 2018 |
| TY CI Dog Grooming Ltd | Agriculture & fishing | 2024 |
| TY Gofal Ltd | Health & social care | 2017 |
| TY Lewis CYF | Hospitality | 2020 |
| TY Smiths Ltd | Real estate | 2023 |
| TY Unnos CYF | Real estate | 2018 |
| Ty-Elli Properties Limited | Real estate | 2001 |
| Ty-Glas Properties Limited | Real estate | 2018 |
| Ty-Reno Ltd | Real estate | 2025 |
| Tycroes Holdings Limited | Professional & scientific | 1993 |
| Tyisha Building Preservation Community Interest Company | Arts & recreation | 2024 |
| Tynewydd Designs 2010 Ltd | Professional & scientific | 2025 |
| Tytech Ltd | Manufacturing | 2023 |
| Tywyn AUR Ltd | Hospitality | 2023 |
| UAS Car Care Limited | Wholesale & retail | 2013 |
| Uked Ltd | Transport & logistics | 2026 |
| Ultimate Skips Ltd | Water & waste | 2018 |
| Ultra Beautiful Ltd | Wholesale & retail | 2020 |
| Underfloor Heating Superstore Ltd | Wholesale & retail | 2021 |
| Underground Utilities & Safety Training Ltd | Construction | 2025 |
| Unitgrade Limited | Real estate | 1973 |
| Unity Grounds Ltd | Administrative & support | 2026 |
| Universal Deliveries Ltd | Transport & logistics | 2018 |
| Upstream Media Ltd | Information & communication | 2023 |
| Urban Ascent Ltd | Wholesale & retail | 2025 |
| V & S Consultancy Limited | Health & social care | 2017 |
| Vale of Aeron Ltd | Hospitality | 2019 |
| Valiant Sport and Recreation CIC | Education | 2025 |
| Vapes & Vinyls Ltd | Wholesale & retail | 2019 |
| Vaughan Construction Ltd | Construction | 2016 |
| Vaughan Copper Works Limited | Construction | 2024 |
| Vaughan Sound Installations Limited | Construction | 1987 |
| Vaughan Sports Travel Ltd | Administrative & support | 2019 |
| Vaughan Voyage Ltd. | Administrative & support | 2019 |
| Vejays Indian Street Food Ltd | Hospitality | 2024 |
| Velicore Ltd | Real estate | 2022 |
| Vendrite Limited | Wholesale & retail | 2024 |
| Venner Television North Limited | Information & communication | 2002 |
| Venner TV Limited | Information & communication | 1995 |
| Vessey Property Ltd | Real estate | 2025 |
| VHS to DVD Ltd | Manufacturing | 2019 |
| Vickysvibrations Ltd | Manufacturing | 2025 |
| Vindico ICS Ltd | Information & communication | 2016 |
| Vindico PDL Ltd | Information & communication | 2014 |
| VIO Construct Limited | Construction | 2025 |
| Visibly Rocks Ltd | Professional & scientific | 2018 |
| Visions Transmission Services Limited | Information & communication | 1993 |
| Visvira Limited | Information & communication | 2023 |
| Vitec Microgenix Limited | Administrative & support | 2020 |
| Vmtv Limited | Information & communication | 1981 |
| Vodasy Ltd | Manufacturing | 2017 |
| Vranch Farming Limited | Financial services | 2022 |
| VST Forecourts Limited | Wholesale & retail | 2017 |
| VST Property Investment Holdings Limited | Real estate | 2023 |
| VST Property Management Limited | Real estate | 2023 |
| VST Retail Stores Ltd | Wholesale & retail | 2026 |
| W a Bowler Limited | Construction | 2002 |
| W Lloyd Ltd | Professional & scientific | 2016 |
| W R Windows Ltd | Construction | 2022 |
| WAA (Holdings) Limited | Professional & scientific | 2008 |
| Wael Kadri Ltd | Transport & logistics | 2025 |
| WAL Group Ltd | Financial services | 2026 |
| Waldron Construction Consulting Ltd | Professional & scientific | 2024 |
| Wales and West Building Products Ltd | Wholesale & retail | 2017 |
| Wales Seed Hub (HWB Hadau Cymru) Ltd | Wholesale & retail | 2023 |
| Walkover International Ltd | Manufacturing | 2015 |
| Wandr Security Ltd | Administrative & support | 2025 |
| Warren Davies Ltd | Health & social care | 2006 |
| Warwick Plant Ltd | Wholesale & retail | 2014 |
| Waste Disposal (Wales & South West) Limited | Professional & scientific | 2019 |
| Waterbed Essentials Ltd | Wholesale & retail | 2005 |
| Waun Construction Ltd | Construction | 2024 |
| Wayne Davies Flooring Ltd | Construction | 2013 |
| Wayne Edwards Plumbing & GAS Ltd | Construction | 2018 |
| Wayne Lewis GAS Services Limited | Construction | 2003 |
| Wayne Morgan Financial Services Limited | Financial services | 2015 |
| Wayne Morgan Transport Ltd | Transport & logistics | 2011 |
| WD Care Ltd | Health & social care | 2019 |
| WE Fetch Ltd | Transport & logistics | 2022 |
| Web Marketer Ltd | Professional & scientific | 2018 |