| Wales Lacrosse Limited | Arts & recreation | 2025 |
| Wallace Construction Limited | Construction | 2017 |
| Wallis Group Limited | Financial services | 1994 |
| Wallis Laboratory Limited(The) | Manufacturing | 1951 |
| Wallis Licensing Limited | Manufacturing | 1994 |
| Wallsgrove Developments Ltd | Construction | 2018 |
| Warburtons AI Solutions Ltd | Information & communication | 2025 |
| Warntec Consulting Ltd | Construction | 2023 |
| Washington Supply Ltd | Wholesale & retail | 2016 |
| Wataps Properties Ltd | Real estate | 2023 |
| Water Bear Business Finance Limited | Financial services | 2019 |
| Water Clean Limited | Professional & scientific | 2008 |
| Watergate Properties (Ellesmere) Limited | Real estate | 1956 |
| Watl Group Ltd | Administrative & support | 2021 |
| Wayne Evans Surveying Ltd | Construction | 2010 |
| Wayside Limited | Real estate | 1990 |
| WB Environmental Limited | Water & waste | 2014 |
| WB Wellbeing Limited | Extraterritorial | 2015 |
| WCA Financials Limited | Professional & scientific | 2013 |
| Wcdc Holdings Limited | Health & social care | 2015 |
| Wcdc Topco Limited | Financial services | 2025 |
| WDJ Logs & Biomass Ltd | Agriculture & fishing | 2025 |
| WE ARE Leicester C.I.C. | Administrative & support | 2019 |
| WE ARE WXM Community Interest Company | Administrative & support | 2021 |
| WE DO Enterprise Limited | Professional & scientific | 2026 |
| Weatherproof Roofing & Building Solutions Ltd | Construction | 2025 |
| Web Market Place Ltd | Information & communication | 2017 |
| Web Wonder Woman Ltd | Information & communication | 2022 |
| WECARE24 Ltd | Health & social care | 2022 |
| Weekes Electrical Contractors Ltd | Construction | 2016 |
| Welch Fusiliers Limited | Hospitality | 2021 |
| Welcome to Wrexham Ltd | Administrative & support | 2023 |
| Weld Cleaning Warehouse Ltd | Wholesale & retail | 2020 |
| Welhandy Services Limited | Construction | 2021 |
| Wellbeing Bidco Limited | Financial services | 2021 |
| Wellbeing Midco Limited | Financial services | 2021 |
| Wellbeing Monitor Limited | Health & social care | 2016 |
| Wellbeing Topco Limited | Financial services | 2021 |
| Welsby Limited | Real estate | 2025 |
| Welsh Area Digital Supplies Limited | Information & communication | 2009 |
| Welsh Meadow CYF | Agriculture & fishing | 2020 |
| Wendy Wren Ltd | Education | 2015 |
| Werecruitforyou Ltd | Administrative & support | 2025 |
| Westgrove Estates Limited | Real estate | 2000 |
| Westminster Engineering Limited | Manufacturing | 2003 |
| Westport Medical Ltd | Health & social care | 2024 |
| WFS Contractors Limited | Construction | 2010 |
| WGB Utility Management (UK) Ltd | Professional & scientific | 2015 |
| WGR Engineering Limited | Professional & scientific | 2011 |
| What’S Yours Ltd | Hospitality | 2024 |
| White Buck Ltd | Wholesale & retail | 2021 |
| White Cube Design Ltd | Construction | 2022 |
| White Door Holdings Ltd | Real estate | 2020 |
| White Door Properties Ltd | Real estate | 2019 |
| White Mirror Studio Ltd | Information & communication | 2022 |
| White Rowland Group Ltd | Financial services | 2023 |
| White Star Accommodations Limited Limited | Households | 2025 |
| White Waters Healthcare Ltd | Administrative & support | 2022 |
| Whitelea Property Ltd | Real estate | 2022 |
| Whitson Construction Ltd | Construction | 2018 |
| Wholebake (Topco) Limited | Professional & scientific | 2011 |
| Wholebake Limited | Manufacturing | 1996 |
| Wididi Limited | Wholesale & retail | 2016 |
| Wild and Free With SJ Ltd | Health & social care | 2026 |
| Wild Cherry Camping Ltd | Hospitality | 2019 |
| Wild Garlic Event Catering Limited | Hospitality | 2015 |
| Wild West Whisky Limited | Manufacturing | 2026 |
| Wild Wonder Box Limited | Wholesale & retail | 2023 |
| Wild-Moon Distillery Ltd | Manufacturing | 2022 |
| Wildbloom Academy Ltd | Agriculture & fishing | 2023 |
| Wilding Sisters CIC | Other services | 2026 |
| Wilkins and Wilkins Company Limited | Professional & scientific | 2010 |
| Will B Fit Ltd | Arts & recreation | 2014 |
| Willberry Transport Ltd | Transport & logistics | 2020 |
| William Estates Ltd | Real estate | 2014 |
| Williams Heating (North West) Limited | Construction | 2018 |
| Williams Light Haulage Limited | Transport & logistics | 2018 |
| Williams Plastering Services Ltd | Construction | 2017 |
| Williams Wrexham Limited | Wholesale & retail | 2012 |
| Willow & Birch Ltd | Real estate | 2024 |
| Willow Bladez Ltd | Manufacturing | 2025 |
| Willowford Homes Ltd | Real estate | 2025 |
| Willowgreen Design Ltd | Professional & scientific | 2016 |
| Willpower DC Limited | Information & communication | 2001 |
| Wilo Event Hire Ltd | Administrative & support | 2015 |
| Wilson Asset Holdings Ltd | Financial services | 2023 |
| Wilson Properties (North Wales) Limited | Real estate | 1929 |
| Wilsons Accident Repair Centre Ltd | Wholesale & retail | 2010 |
| Wimyta Electrics Limited | Construction | 2006 |
| Winch & Plummet Ltd | Wholesale & retail | 2021 |
| Windows Direct (North West) Ltd | Construction | 2021 |
| Wingetts Holdings Limited | Financial services | 2020 |
| Winning Wishes Competitions Limited | Wholesale & retail | 2025 |
| Winston Coed Limited | Professional & scientific | 2022 |
| Wintergreen-Uk CIC | Health & social care | 2020 |
| Wise Training Hub Ltd | Education | 2024 |
| Wisinger Site Solutions Ltd | Construction | 2022 |
| With Love Digital Ltd | Information & communication | 2026 |
| Withins (Breightmet) Limited | Health & social care | 1999 |
| WIW Resale Ltd | Wholesale & retail | 2026 |