| VIV John Scaffolding Limited | Construction | 2013 |
| Vivi Creative Ltd | Information & communication | 2021 |
| Vivian Court Swansea Limited | Real estate | 2015 |
| Vivid Block Limited | Information & communication | 2016 |
| Vividtech for Good CIC | Information & communication | 2024 |
| Vividx Ltd. | Information & communication | 2023 |
| Vivien Townsend Consulting Limited | Education | 2011 |
| Vivus Holdings Limited | Financial services | 2022 |
| Vixxos Ltd | Manufacturing | 2020 |
| Vizolution Limited | Information & communication | 2008 |
| VK Bro's Limited | Hospitality | 2024 |
| VM Care Solutions Limited | Health & social care | 2023 |
| VM Construction Group Ltd | Construction | 2025 |
| Vmas Worcester Limited | Health & social care | 2014 |
| Vmodp Ltd | Health & social care | 2024 |
| VMS Property Limited | Real estate | 2026 |
| Vocaleyes Democracy C.I.C. | Information & communication | 2019 |
| Voicebox Multimedia Limited | Professional & scientific | 2014 |
| Vojon Limited | Hospitality | 2012 |
| Vojon Swansea Ltd | Hospitality | 2022 |
| Volara Ltd | Professional & scientific | 2025 |
| Volcano Theatre Company Limited | Arts & recreation | 1988 |
| Volcano Trading Company Ltd | Arts & recreation | 2015 |
| Vollgas IQ Ltd | Administrative & support | 2025 |
| Vons Properties Limited | Real estate | 2019 |
| Vonyx Ltd | Wholesale & retail | 2026 |
| Vortexair Ltd | Professional & scientific | 2019 |
| Vortici Limited | Wholesale & retail | 2025 |
| Voss Lettings and Investments Limited | Real estate | 2025 |
| Vosss Limited | Real estate | 2021 |
| VOX Solutions Ltd | Financial services | 2018 |
| Voxjump Marketing Ltd | Professional & scientific | 2025 |
| VPS Logistics Ltd | Transport & logistics | 2025 |
| VR Vistas Ltd | Information & communication | 2008 |
| VRM MOT & Service Centre Limited | Wholesale & retail | 2022 |
| VRM Swansea (Vehicle Registration Marketing) Limited | Administrative & support | 2005 |
| VRM Warranties Limited | Wholesale & retail | 2021 |
| VS Construction Swansea Limited | Construction | 2025 |
| VSN Plastics Solutions Ltd | Information & communication | 2015 |
| VW Property Holdings Limited | Real estate | 2016 |
| VW Vacays Ltd | Administrative & support | 2023 |
| W & E Builders Limited | Construction | 2016 |
| W & N Associates Limited | Real estate | 2002 |
| W & T Builders Limited | Construction | 2019 |
| W a C R Limited | Construction | 2013 |
| W Davies Ironmongers Limited | Wholesale & retail | 2015 |
| W Howell Limited | Health & social care | 2018 |
| W J Harrison Consulting Ltd | Professional & scientific | 2018 |
| W J I Limited | Hospitality | 2007 |
| W M Johnson Consulting Limited | Professional & scientific | 2025 |
| W M T Mobility Ltd | Wholesale & retail | 2026 |
| W P S DP Ltd | Real estate | 2024 |
| W P S Wealth Limited | Professional & scientific | 2012 |
| W R Lloyd Contracting Limited | Agriculture & fishing | 2025 |
| W Waffle Ltd | Hospitality | 2025 |
| W. G. Davies (Commercials) Limited | Extraterritorial | 1985 |
| W.George and SON Limited | Construction | 1971 |
| W123 World Limited | Wholesale & retail | 2012 |
| W360 Ltd | Professional & scientific | 2021 |
| W7 Group Limited | Administrative & support | 2024 |
| Wade Landscapes Limited | Administrative & support | 2013 |
| Wagman Windows (Home Improvements) Ltd | Manufacturing | 2010 |
| Wagman Windows Limited | Construction | 1991 |
| Wagz Ltd | Professional & scientific | 2025 |
| Wales APE and Monkey Sanctuary Ltd | Arts & recreation | 1999 |
| Wales National Pool Swansea | Arts & recreation | 2001 |
| Walford-Richards Designs Ltd | Wholesale & retail | 2017 |
| Wall to Wall Carpets Ltd | Wholesale & retail | 2002 |
| WALL2WALL Decorating Limited | Construction | 2006 |
| Wallfix Wallties Limited | Construction | 2022 |
| Walpart Limited | Administrative & support | 2010 |
| Walter Kingsbury Investments Limited | Real estate | 1964 |
| Walter Road Insurance Consultants Limited | Financial services | 1957 |
| Walters Editing Ltd | Information & communication | 2017 |
| Walters EHS Services Ltd | Professional & scientific | 2022 |
| Waltwood Accountancy Services Limited | Professional & scientific | 2009 |
| Waltwood Accountants Ltd | Professional & scientific | 2016 |
| WAM Care Homes Limited | Health & social care | 1993 |
| WAM Engineering Services Ltd | Professional & scientific | 2022 |
| WAM Group Holdings Ltd | Professional & scientific | 2000 |
| WAM Investment Holdings Ltd | Real estate | 2026 |
| WAM Leisure Limited | Hospitality | 2009 |
| Wanderstone Management Ltd | Administrative & support | 2021 |
| Wang HAO Limited | Wholesale & retail | 2019 |
| Wangji Chinese Flavor Limited | Hospitality | 2017 |
| Wanted Consulting Ltd | Other services | 2015 |
| Warehouse Ents Limited | Hospitality | 2022 |
| Wark Properties Limited | Real estate | 2023 |
| Warm Homes Energy Solutions Ltd | Construction | 2025 |
| Warm Tech Ltd | Construction | 2018 |
| Warmer Property Developments Ltd | Construction | 2025 |
| Warmerhomes Plumbing and Heating Ltd | Construction | 2023 |
| Warmgen Plumbing and Heating Ltd | Construction | 2026 |
| Warmserve Cover Limited | Manufacturing | 2015 |
| Warmserve Services Limited | Construction | 2013 |
| Warmtec Home Improvements Ltd | Construction | 2024 |
| Warrix Limited | Education | 2005 |
| Waseka Limited | Professional & scientific | 2015 |
| Washed Aggregates Trade Association (Wata) UK Ltd | Other services | 2024 |
| Waste Fuels and Recycling Limited | Water & waste | 2022 |