| Whitecliff Road Management Company Limited | Households | 2010 |
| Whitehard HAT Properties Ltd | Real estate | 2024 |
| Whitehills Project Ltd | Hospitality | 2018 |
| Whitelabel Consulting Limited | Information & communication | 2020 |
| Whiteladies Management Company (Lilliput) Limited | Households | 1999 |
| Whitelock & Company Limited | Construction | 1996 |
| Whitelock Investments | Construction | 1936 |
| Whitfield Holdings Limited | Financial services | 2023 |
| Whitmarsh High Performance Rib`S Limited | Manufacturing | 2009 |
| WHO Dares Gives C.I.C. | Education | 2024 |
| WHO Dares Group Ltd | Financial services | 2024 |
| WHO Dares Gyms (Shore Fitness) Ltd | Education | 2021 |
| WHO Dares Gyms Clothing Ltd | Wholesale & retail | 2023 |
| Whole.Protect Limited | Construction | 2022 |
| Wholesale Clearance UK Limited | Wholesale & retail | 2005 |
| WHS Enterprises (South) Ltd | Hospitality | 2019 |
| WHY Jewellers Limited | Manufacturing | 1999 |
| Wicked Coatings Limited | Manufacturing | 2012 |
| Wicked Competitions Ltd | Arts & recreation | 2025 |
| Wicklow Close Management Company Limited | Professional & scientific | 2003 |
| Wide Digital Ltd | Information & communication | 2019 |
| Wide Propco Ltd | Real estate | 2026 |
| Widefm Limited | Other services | 2011 |
| Widesilk Ltd | Households | 2001 |
| Wideview Tech Ltd | Information & communication | 2024 |
| Wiebe Commodity Consulting Ltd | Professional & scientific | 2021 |
| Wightco Limited | Agriculture & fishing | 2010 |
| Wigston Lettings Ltd | Real estate | 2016 |
| Wigston Properties Limited | Real estate | 2013 |
| Wijd Limited | Wholesale & retail | 2025 |
| Wikiled Ltd. | Information & communication | 2010 |
| Wilberforce Green Management Company Ltd | Households | 2025 |
| Wilcox United Limited | Financial services | 2015 |
| Wild About Words Limited | Information & communication | 2025 |
| Wild Angels World Ltd | Arts & recreation | 2026 |
| Wild Digital Ltd | Information & communication | 2020 |
| Wild England Limited | Manufacturing | 2020 |
| Wild Goose Ventures Ltd | Information & communication | 2008 |
| Wild Oak Farm Ashwater Ltd | Agriculture & fishing | 2023 |
| Wild Roots Greenery Limited | Wholesale & retail | 2020 |
| Wild Thyme Films Limited | Information & communication | 2017 |
| Wildflower Publishing Limited | Information & communication | 2025 |
| Wilding & Wonder Ltd | Wholesale & retail | 2023 |
| Wildor Studios Ltd | Information & communication | 2022 |
| Wilfstudio Ltd | Wholesale & retail | 2025 |
| Wilkham Associates Limited | Other services | 2019 |
| Will Creighton Consultancy Limited | Public administration | 2023 |
| Will My Way Ltd | Health & social care | 2025 |
| William 1 Ltd | Hospitality | 2025 |
| William Bowley Projects Ltd | Construction | 2013 |
| William Court (Poole) Management Company Ltd | Households | 2015 |
| William JAY Engineering Limited | Professional & scientific | 2009 |
| William Rose Property Management Ltd | Households | 2024 |
| Williams Cars South Ltd. | Wholesale & retail | 2019 |
| Williams Consultancy Services Limited | Professional & scientific | 2023 |
| Williams Consulting Ltd | Professional & scientific | 2023 |
| Williams-Harris Optical Supplies Limited | Manufacturing | 1975 |
| Williamson Dental Surgery & Facial Aesthetics Limited | Health & social care | 2019 |
| Willmott Orthopaedics Limited | Health & social care | 2015 |
| WILLO777 Ltd | Wholesale & retail | 2022 |
| Willoughby (613) Limited | Real estate | 2017 |
| Willow Accounting Limited | Professional & scientific | 2021 |
| Willow and Hall Ltd | Administrative & support | 2012 |
| Willow Close Properties Limited | Financial services | 1964 |
| Willow Tree Rudgwick Ltd | Construction | 2025 |
| Willow Tree Send Ltd | Construction | 2025 |
| Willow Tree Strategic Homes Ltd | Construction | 2025 |
| Willow Tree Wargrave Ltd | Construction | 2025 |
| Willow Way Property Limited | Hospitality | 2026 |
| Willow Wood Developments Limited | Construction | 2014 |
| Willowbank Farm Rare Breeds Rescue Ltd | Agriculture & fishing | 2023 |
| Willowtake Ltd | Hospitality | 2003 |
| Wilshaw Contracting Ltd | Construction | 2025 |
| Wilshaw Glazing Ltd | Construction | 2025 |
| Wilshaw Group Ltd | Construction | 2025 |
| Wilson Bishop Ltd | Professional & scientific | 2023 |
| Wilson Investments (Poole) Ltd | Real estate | 2016 |
| Wilson Thomas Holdings Limited | Real estate | 2018 |
| Wilson Thomas Limited | Real estate | 2003 |
| Wilton House (Westbourne) Limited | Households | 1997 |
| Wilxys Window Warehouse Limited | Wholesale & retail | 2004 |
| Wimborne District Model Engineers | Arts & recreation | 1998 |
| Wimborne Minster Folk Festival Limited | Arts & recreation | 2012 |
| WIN73. Co Ltd | Manufacturing | 2022 |
| Winbury Court Maidenhead RTE Company Limited | Households | 2004 |
| Winchester Place (Management) Limited | Real estate | 1986 |
| Wind Trim Ltd | Manufacturing | 2025 |
| Windfall Brands Limited | Wholesale & retail | 2025 |
| Windfall Partners Limited | Wholesale & retail | 2020 |
| Windsor Court Residents Association (Parkstone) Limited | Households | 1961 |
| Wingfield Software Ltd | Information & communication | 2025 |
| Winners Circle London Limited | Manufacturing | 2019 |
| Winplay Ltd | Information & communication | 2025 |
| Winshport Limited | Wholesale & retail | 2008 |
| Winston Heights Ltd | Financial services | 2014 |
| Winstongrade Homes Limited | Construction | 2007 |
| Winter Gardens Hotel Ltd | Wholesale & retail | 2006 |
| Winter Productions Ltd | Extraterritorial | 2012 |
| Winter Property Investments Limited | Real estate | 2016 |
| Winterborne Property Limited | Real estate | 2025 |