| Wembley Properties (2010) Ltd | Real estate | 2010 |
| Wendel View Residents Management Company Limited | Households | 2021 |
| Wendlings Investments Private Limited | Health & social care | 2014 |
| Wenholm Limited | Households | 1974 |
| Wentworth Projects Ltd | Construction | 2018 |
| Wessex Social Ventures C.I.C. | Professional & scientific | 2016 |
| Wessex Superbowl (Germany) Limited | Extraterritorial | 1996 |
| Wessex Support Services Limited | Extraterritorial | 1980 |
| West Herts Construction Ltd | Construction | 2023 |
| West London Pipeline and Storage Limited | Professional & scientific | 1985 |
| West Point (Corsham) Management Company Ltd | Households | 2013 |
| West Upper 134 Ltd | Information & communication | 2025 |
| West Wirral Properties Limited | Real estate | 1999 |
| Westbourne Living Ltd | Wholesale & retail | 2026 |
| Westbrook HAY Educational Trust Limited | Education | 1985 |
| Westbrook Strategy Ltd | Professional & scientific | 2022 |
| Westcombe Park (Heybridge) Management Company Limited | Households | 2024 |
| Westerdale Management Company Limited | Households | 2006 |
| Western Lakes (Silver END) Management Company Limited | Households | 2021 |
| Western Road (Ealing) Residents Management Company Limited | Households | 2016 |
| Westgate EFI Global Ltd | Wholesale & retail | 2019 |
| Westley Green Management Company Limited | Households | 2017 |
| Westmere (Willingham) Management Company Limited | Households | 2020 |
| Westminster Park Management Company (NO. 1) Limited | Households | 2002 |
| Westminster View (Clayton) Management Company Limited | Households | 2022 |
| Weston Fish Bar Limited | Wholesale & retail | 1975 |
| Weston View Management Limited | Households | 2005 |
| WEY Place (Woking) Residents Management Company Limited | Households | 2008 |
| Wfs-Signs Ltd | Professional & scientific | 2019 |
| WG Landscapes Ltd | Administrative & support | 2026 |
| Wharfedale Management Ltd | Real estate | 2005 |
| Whats.On Brighton Ltd | Information & communication | 2025 |
| Wheatley Chase (Halifax) Management Company Limited | Households | 2010 |
| Wheels by JV Tech Ltd | Wholesale & retail | 2025 |
| When the Adults Change Ltd | Education | 2021 |
| White Dog First AID Ltd | Education | 2018 |
| White Genie Limited | Professional & scientific | 2017 |
| White Oaks (Ferndown) Management Limited | Households | 2011 |
| White Rock Management Company Limited | Households | 2002 |
| White Seahorse Ltd | Administrative & support | 2025 |
| White Stork Vale (Storrington) Management Company Ltd | Households | 2022 |
| White Tiger Immigration Ltd | Professional & scientific | 2023 |
| Whitecliff Bay and Hotel Company,Limited | Hospitality | 1937 |
| Whitecliff Bay Holiday Park Limited | Hospitality | 1954 |
| Whitehill Management Company (Newton Abbot) Ltd | Administrative & support | 2018 |
| Whitehouse Farm Apartments (Emersons Green) Management Company Limited | Households | 2022 |
| Whitehouse Park Residents Management Company Limited | Households | 2023 |
| Whiteley Meadows Northern PH1 Limited | Households | 2019 |
| Whiteley Meadows Southern Limited | Households | 2021 |
| Whites & Blacks Ltd | Hospitality | 2017 |
| Whitestar Solutions Ltd | Construction | 2000 |
| Whitestone Smiles Ltd | Health & social care | 2026 |
| Whitlock Properties Limited | Real estate | 2020 |
| Whittaker Aerospace | Extraterritorial | 1993 |
| Whitton Electrical Limited | Construction | 2009 |
| Whitton Fire Systems Limited | Construction | 2014 |
| Wholesale Eyecare Limited | Wholesale & retail | 2006 |
| Wholistic Traders Limited | Wholesale & retail | 2024 |
| Whyford Holdings Ltd | Financial services | 2025 |
| Widmer Business Services Limited | Professional & scientific | 2024 |
| Wiggy Stardust Ltd | Other services | 2024 |
| Wigmore Park Management Company Limited | Households | 2021 |
| Wildberry Way (Whiteley) Management Company Limited | Households | 2010 |
| Wildflower Meadow Limited | Households | 2021 |
| Wildgrip Ltd | Information & communication | 2024 |
| Wildhouse Meadows (Milnrow) Residents Management Company Limited | Households | 2025 |
| Wildtek Innovation Ltd | Professional & scientific | 2025 |
| Wildybeast Ltd | Information & communication | 2011 |
| Will's Gates Ltd | Construction | 2014 |
| William Charles Consulting Ltd | Professional & scientific | 2003 |
| William Kirk Management Limited | Construction | 2014 |
| Williamconnors.Tech Ltd | Information & communication | 2025 |
| Williams Court (Enfield) Management Ltd | Households | 2021 |
| Williams Windows & Doors Limited | Construction | 2024 |
| Willington Down Estate Management Company Limited | Households | 2020 |
| Willo Sports Tax Ltd | Professional & scientific | 2025 |
| Willoughby (880) Limited | Professional & scientific | 2015 |
| Willow Group Holdings Ltd | Financial services | 2024 |
| Willow Logistics Ltd | Construction | 2026 |
| Willow Park (Bramley) Management Company Limited | Households | 2026 |
| Willow Park (Halstead) Management Company Limited | Real estate | 2019 |
| Willow Vale Residents Company Limited | Households | 2009 |
| Willow View Homes Ltd | Real estate | 2022 |
| Willowbrook Lettings Limited | Real estate | 2018 |
| Willowbrook Park (Didcot) Management Company Limited | Households | 2019 |
| Willowfield Investments Limited | Financial services | 2024 |
| Willowtree Management Limited | Households | 1982 |
| Willson Building Solutions Ltd | Construction | 2018 |
| Wilmington Counselling Ltd | Health & social care | 2023 |
| Wilshaw Medical Consultancy Ltd | Professional & scientific | 2021 |
| Wilson Green Property Limited | Households | 2015 |
| Wilton House Limited | Health & social care | 1986 |
| Winchester Contract Management Limited | Administrative & support | 2003 |
| Winchester Gardens (Chesterfield) Management Company Limited | Households | 2005 |
| Windmill Foods Limited | Hospitality | 2025 |
| Windrush Court Property Limited | Real estate | 2026 |
| Windscreen FIX Ltd | Wholesale & retail | 2018 |
| Windy Bottom Properties Ltd | Real estate | 2021 |
| Wingwood Limited | Construction | 2005 |
| Winlord Rights Limited | Arts & recreation | 2002 |