| West & Owen Brickwork Limited | Construction | 2026 |
| West Coast Decorators Ltd | Construction | 2018 |
| West Coast Landscaping and Garden Services Ltd | Administrative & support | 2017 |
| West Coast Roofing Supplies Ltd | Wholesale & retail | 2018 |
| West Coast Shopfitters & Joiners Ltd | Construction | 2013 |
| West Cross Autos Limited | Wholesale & retail | 2026 |
| West Cross Hotel Ltd | Hospitality | 2023 |
| West Cross Inn Ltd | Hospitality | 2018 |
| West Division Amateur Boxing Community Interest Company | Education | 2026 |
| West END A.F.C CIC | Arts & recreation | 2024 |
| West END Florist Limited | Wholesale & retail | 2005 |
| West French Ltd | Administrative & support | 2013 |
| West Lancashire Training and Learning Centre Community Interest Company | Education | 2007 |
| West Midlands Electrical Ltd | Construction | 2013 |
| West Wales Sports Partnership Limited | Arts & recreation | 2023 |
| West Wales Ventures Ltd | Transport & logistics | 2026 |
| West Winds Developments Limited | Real estate | 2015 |
| Westacre Holdings Limited | Professional & scientific | 2001 |
| Westacres Homes Limited | Construction | 2015 |
| Westbrook Property Ventures Limited | Real estate | 2020 |
| Westcoast Signs Limited | Manufacturing | 2001 |
| Westdeck Limited | Transport & logistics | 2018 |
| Western Cape Commercial Ltd | Construction | 2025 |
| Western Cape Construction & Utilities Group Ltd | Construction | 2020 |
| Western Carbons Ltd | Manufacturing | 1995 |
| Western Stone Supplies Ltd | Mining & quarrying | 2009 |
| Westernights Ltd | Hospitality | 2024 |
| Westhill Developments Holdings Limited | Construction | 2007 |
| Westhill Developments Limited | Real estate | 2002 |
| Weston Consulting Limited | Professional & scientific | 2013 |
| Westridge (Technical Services) Ltd | Professional & scientific | 1998 |
| Westshire UK Properties Ltd | Real estate | 2021 |
| Westwinds Properties Limited | Real estate | 2021 |
| Westwinds Ventilation Ltd | Construction | 2019 |
| Westy Brickwork Limited | Construction | 2022 |
| Weycroft Project Management Limited | Other services | 2003 |
| WF Recycling Limited | Wholesale & retail | 2021 |
| WGK Surgery Ltd | Health & social care | 2013 |
| WGV Access Limited | Construction | 2018 |
| WH (Wrexham) Ltd | Hospitality | 2022 |
| WH OPS Ltd | Hospitality | 2020 |
| Whatbase Cheesecakes Ltd | Manufacturing | 2022 |
| Whatever the Weather Limited | Information & communication | 2013 |
| Whats on Limited | Information & communication | 1995 |
| Whbw OPS Ltd | Hospitality | 2025 |
| WHC Property Holdings Ltd | Financial services | 2021 |
| Wheatsheaf Bar Services Ltd | Hospitality | 2015 |
| Wheel Candy Swansea Ltd | Wholesale & retail | 2024 |
| Whingers Limited | Hospitality | 2003 |
| Whit Scaffolding Ltd | Construction | 2025 |
| White and Jones Property Ltd | Real estate | 2019 |
| White Coconut Ltd | Hospitality | 2019 |
| White GEM Limited | Real estate | 2020 |
| White Horse Brands Limited | Wholesale & retail | 2024 |
| White Horse Commercial Finance Limited | Financial services | 2025 |
| White Island Properties Ltd | Real estate | 2022 |
| White Isle Properties Ltd | Real estate | 2020 |
| White Knight Market Ltd | Wholesale & retail | 2025 |
| White Label Limited | Information & communication | 2026 |
| White Rock Consulting Ltd | Administrative & support | 2025 |
| White Rock Knotweed Solutions Limited | Administrative & support | 2021 |
| White Rock Property Care (South Wales) Limited | Construction | 2012 |
| White Specialist Investments Limited | Other services | 2015 |
| White's Table & Taste Ltd | Hospitality | 2024 |
| White-Webs Ltd | Education | 2007 |
| Whitecross and SON Limited | Construction | 2003 |
| Whiteford Law Limited | Professional & scientific | 2026 |
| Whitehall Collective Ltd | Hospitality | 2019 |
| Whitehurst Electrical Limited | Construction | 2016 |
| Whiteline Logistics Ltd | Wholesale & retail | 2018 |
| Whiteline Motors Ltd | Wholesale & retail | 2019 |
| Whiteline Motors MOT Ltd | Wholesale & retail | 2019 |
| Whitelite Limited | Wholesale & retail | 1992 |
| Whiterock Decorators Limited | Construction | 2012 |
| Whitestones Properties Limited | Professional & scientific | 1997 |
| Whitez Snooker Limited | Hospitality | 2007 |
| Whittle Haulage & Transport Carmarthen Limited | Transport & logistics | 2018 |
| Wholehearted Organic Health Limited | Hospitality | 2018 |
| WHS Canning Brett Ltd | Manufacturing | 2000 |
| WI & J Adams Limited | Agriculture & fishing | 2011 |
| Widows Sons Masonic Motorcycle Assn Ltd | Arts & recreation | 2025 |
| Wigley Pictures Ltd | Information & communication | 2022 |
| Wild Carrot Ltd | Hospitality | 2026 |
| Wild Davies Investments Ltd | Real estate | 2024 |
| Wild Davies Property Ltd | Real estate | 2024 |
| Wild Idea Group Ltd | Manufacturing | 2026 |
| Wild Plant Paper CIC | Manufacturing | 2023 |
| Wilda Holdings Ltd | Real estate | 2024 |
| Wildbyte Technologies Limited | Professional & scientific | 2012 |
| Wilder Expeditions Limited | Administrative & support | 2018 |
| Will Begg Carpentry & Building Services Ltd | Construction | 2017 |
| Willatt Care Limited | Public administration | 2020 |
| William Battle Learning Limited | Professional & scientific | 2003 |
| William W Fyall Limited | Construction | 2010 |
| William's Building & Property Maintenance Ltd | Construction | 2008 |
| Williams & Brace Property Limited | Real estate | 2009 |
| Williams Brothers Builders Ltd | Construction | 2021 |
| Williams Building & Roofing Services Ltd | Construction | 2026 |
| Williams Commercial Consultancy Limited | Professional & scientific | 2022 |
| Williams Electrical SW Ltd | Construction | 2023 |