| TY Croeso Limited | Hospitality | 2018 |
| TY Crwn Limited | Other services | 2016 |
| TY Gwyn House Ltd | Hospitality | 2022 |
| TY Pwmp Ltd | Hospitality | 2025 |
| TY WY Limited | Real estate | 2021 |
| Tydal Pro Limited | Professional & scientific | 2022 |
| Tyler Bont Holdings Limited | Real estate | 2024 |
| Tynant Garage Limited | Wholesale & retail | 2024 |
| UK Anson Company Limited | Professional & scientific | 2015 |
| UK Being Gear Trading Ltd | Manufacturing | 2024 |
| UK Jofo Jojo Medical Research Studio Co., Ltd | Manufacturing | 2022 |
| UK Lorien Limited | Wholesale & retail | 2026 |
| UK Okdeals Ltd | Wholesale & retail | 2022 |
| UK Paixing Intelligent Co., Limited | Wholesale & retail | 2024 |
| UK Power Ports Technology Co., Ltd | Wholesale & retail | 2010 |
| UK Superpan Ltd | Wholesale & retail | 2025 |
| UK YU Yuan Industrial Limited | Wholesale & retail | 2024 |
| Ulthmok Health Tech (UK) Co., Ltd | Wholesale & retail | 2025 |
| Ultimate Inc Limited | Households | 2016 |
| Ultra Facilities Management Ltd | Administrative & support | 2018 |
| Umatter Commerce Ltd | Wholesale & retail | 2026 |
| Uncle Trading Limited | Wholesale & retail | 2024 |
| Unigifts Design Ltd | Wholesale & retail | 2025 |
| Unity Heat Limited | Construction | 2018 |
| UP and Down Apparel Ltd | Wholesale & retail | 2023 |
| UP Way Ltd | Extraterritorial | 2017 |
| Urban Goods Deals UK Limited | Wholesale & retail | 2025 |
| Urbanmatch Limited | Transport & logistics | 2004 |
| Urbans Essentials Limited | Wholesale & retail | 2026 |
| Urbest Ltd | Wholesale & retail | 2024 |
| Uskvale Joinery Limited | Manufacturing | 2018 |
| USW Commercial Services Ltd. | Education | 1992 |
| USW Enterprises Ltd | Education | 1993 |
| USW Pathway College Limited | Education | 2021 |
| USW Services Limited | Hospitality | 2013 |
| V & S Autos Limited | Wholesale & retail | 2023 |
| V. Griffiths Building Ltd | Construction | 2014 |
| V. Griffiths Roofing Ltd | Construction | 1971 |
| V.E Property Management Ltd | Real estate | 2025 |
| Vale Carpentry Limited | Construction | 2014 |
| Vale Prosthetics Limited | Health & social care | 2014 |
| Valley Commercial Landscaping Ltd | Administrative & support | 2024 |
| Valley Post Ltd | Wholesale & retail | 2023 |
| Valley Repairs & Management Limited | Construction | 2023 |
| Valleys Sports Ltd | Wholesale & retail | 2016 |
| Value Van Centre Limited | Wholesale & retail | 2022 |
| Van Paul Group Ltd | Financial services | 2021 |
| Vansaleswales Limited | Wholesale & retail | 2016 |
| Varga Industries Ltd | Information & communication | 2013 |
| Varma Construction Logistics Ltd | Administrative & support | 2021 |
| Vast Commercial Finance Limited | Financial services | 2021 |
| Vday Sport Ltd | Wholesale & retail | 2025 |
| Vector Training and Consultancy Services Ltd | Education | 2025 |
| Veecent UK Co., Ltd | Wholesale & retail | 2024 |
| Velta Construction Limited | Construction | 2019 |
| Vendico Limited | Wholesale & retail | 2025 |
| Venture DEV Ltd | Information & communication | 2026 |
| Veolia ES Field Services Limited | Water & waste | 2011 |
| Vera Gadget Co., Limited | Wholesale & retail | 2025 |
| VERTEX3D Ltd | Other services | 2026 |
| Veteran Renewables Ltd | Construction | 2022 |
| Vexly Digital Ltd | Wholesale & retail | 2025 |
| Vibe + Chill Ltd | Health & social care | 2025 |
| Vibe + Grind Ltd | Hospitality | 2025 |
| Viceroy Tawa Ltd | Hospitality | 2020 |
| Victoria John (Podiatry) Ltd | Health & social care | 2011 |
| Vida Rogers (Aberbargoed) Ltd | Wholesale & retail | 2017 |
| Vida Rogers (Bargoed) Ltd | Wholesale & retail | 2017 |
| Vida Rogers (Cefn Fforest) Ltd | Wholesale & retail | 2017 |
| Vida Rogers (Fleur DE LYS) Ltd | Wholesale & retail | 2017 |
| Vida Rogers Holdings Ltd | Financial services | 2017 |
| Vintage Upvc Products Limited | Manufacturing | 2012 |
| Violet Crown by AC Ltd | Other services | 2024 |
| Vista Rental Ltd | Administrative & support | 2019 |
| Vital Energy People Ltd | Professional & scientific | 2024 |
| Vitalie’ Activewear Limited | Wholesale & retail | 2025 |
| Vitanova Sciences Ltd | Manufacturing | 2025 |
| Viva Infrastructure Solutions Ltd | Administrative & support | 2018 |
| Vivifly Ltd | Wholesale & retail | 2025 |
| VL Creative Solutions Ltd | Information & communication | 2025 |
| Vogel Vere Ltd | Information & communication | 2026 |
| Volcanic Stone Therapy Ltd | Health & social care | 2023 |
| Voltage Connect Ltd | Construction | 2025 |
| Voltora Retail Ltd | Wholesale & retail | 2026 |
| Voss Dosing Ltd | Manufacturing | 2026 |
| Vowles Engineering Limited | Manufacturing | 1997 |
| Voxman Roberts Ltd | Professional & scientific | 2019 |
| Vranch Holdings Limited | Extraterritorial | 2015 |
| Vrbit Ltd | Professional & scientific | 2023 |
| Vulcan Interiors Ltd | Construction | 2022 |
| W R Investigations Limited | Professional & scientific | 2012 |
| W&H Business Services Limited | Wholesale & retail | 2015 |
| W. Mounter Motorcycles Limited | Wholesale & retail | 2003 |
| W.K.Plasterers Limited | Construction | 1988 |
| WA Xing UK Ltd | Wholesale & retail | 2025 |
| Wakefield Financial Projects Limited | Administrative & support | 2015 |
| Wales Calibration Limited | Information & communication | 2003 |
| Wales Infrastructure Manager of Last Resort Limited | Transport & logistics | 2019 |
| Wales Touch Association | Arts & recreation | 2008 |
| Walkwagplay Ltd | Administrative & support | 2019 |