| Wexer Virtual Limited | Arts & recreation | 2016 |
| Wheels VT Limited | Wholesale & retail | 2000 |
| Whelmar (Chester) Limited | Extraterritorial | 1971 |
| Whelmar (Lancashire) Limited | Extraterritorial | 1936 |
| Whelmar (North Wales) Limited | Extraterritorial | 1946 |
| Whelmar Developments Limited | Extraterritorial | 1965 |
| Where Inspiration Blooms Limited | Arts & recreation | 2018 |
| Where Jess Travels Ltd | Arts & recreation | 2022 |
| WHI Consulting Limited | Professional & scientific | 2014 |
| Whiffaway Ltd | Professional & scientific | 1997 |
| Whippet Consulting Ltd | Information & communication | 2024 |
| White Crystal Investments Limited | Real estate | 2021 |
| White Leaf Care Properties Limited | Real estate | 2010 |
| White Leaf Support Ltd | Health & social care | 2009 |
| White Rose Enterprises Limited | Administrative & support | 2013 |
| White Space Property Ltd | Real estate | 2019 |
| White Sparkle Limited | Administrative & support | 2023 |
| White Stone Engineering Ltd | Professional & scientific | 2024 |
| Whitebox Business Solutions Ltd | Professional & scientific | 2012 |
| Whiteforge Technologies Ltd | Information & communication | 2026 |
| Whiteglass Limited | Wholesale & retail | 2026 |
| Whitehawk Accountancy Ltd | Professional & scientific | 2017 |
| Whitehill & Bordon Development Company BV Limited | Construction | 2020 |
| Whitehill & Bordon Regeneration Company Limited | Construction | 2015 |
| Whitehill & Bordon Regeneration Company TC Limited | Real estate | 2025 |
| Whitewater Limited | Administrative & support | 1986 |
| Whitton Property Management Limited | Real estate | 2002 |
| Whole Cloud Technology Ltd | Information & communication | 2019 |
| WHY WE Run Ltd | Arts & recreation | 2024 |
| Wick-Ridge Ltd | Financial services | 2026 |
| Wickham Court School Limited | Education | 2015 |
| Wickham House (Freehold) Ltd | Households | 2024 |
| Wicklow Projects Limited | Construction | 2001 |
| Wide Shot Lighting Limited | Construction | 2015 |
| Widmer END & District Funeral Directors Ltd | Other services | 2024 |
| Widmer Equestrian Centre Limited | Arts & recreation | 1988 |
| Widmer Farm Limited | Arts & recreation | 2011 |
| Widmer Feeds Limited | Wholesale & retail | 1991 |
| Wifi Executive Cars Ltd | Transport & logistics | 2013 |
| Wigoos Salon Ltd | Wholesale & retail | 2021 |
| Wilcon Homes Anglia Limited | Extraterritorial | 1997 |
| Wilcon Homes Eastern Limited | Extraterritorial | 1965 |
| Wilcon Homes Midlands Limited | Extraterritorial | 1927 |
| Wilcon Homes Northern Limited | Extraterritorial | 1934 |
| Wilcon Homes Southern Limited | Extraterritorial | 1958 |
| Wilcon Homes Western Limited | Extraterritorial | 1996 |
| Wilcon Lifestyle Homes Limited | Extraterritorial | 1982 |
| Wild DYE Couture Limited | Wholesale & retail | 2023 |
| Wild Frog Studios Ltd | Information & communication | 2024 |
| Wild Mind Well-Being CIC | Other services | 2023 |
| Wild Minds Pro Ltd | Health & social care | 2022 |
| Wild Property Management Limited | Households | 2026 |
| Wild Training Limited | Education | 2010 |
| Wild Venison Limited | Agriculture & fishing | 2022 |
| Wild West Welding Limited | Professional & scientific | 2025 |
| Wild Wood London Limited | Wholesale & retail | 2014 |
| Wildlife Management International Limited | Professional & scientific | 2009 |
| Wilfrid Homes Limited | Extraterritorial | 1981 |
| Wilkins Support Group Limited | Hospitality | 2018 |
| Will Bailey Limited | Information & communication | 2023 |
| Willans Wealth Management Ltd | Professional & scientific | 2020 |
| William Drainage Services Ltd | Construction | 2026 |
| William House Management Company Limited | Households | 1984 |
| William Vere (Holdings) Limited | Professional & scientific | 1982 |
| William Vere (Properties) Limited | Real estate | 1946 |
| Williams Horsepower Limited | Agriculture & fishing | 2006 |
| Willow Court (Naphill) Limited | Real estate | 1997 |
| Willow Tree Sports Therapy Limited | Public administration | 2023 |
| Willows Care Services Ltd | Hospitality | 2026 |
| Willows School of Gymnastics Ltd. | Arts & recreation | 2016 |
| Wilson Connolly Holdings Limited | Professional & scientific | 1964 |
| Wilson Connolly Investments Limited | Extraterritorial | 1944 |
| Wilson Connolly Limited | Extraterritorial | 1930 |
| Wilson Connolly Properties Limited | Extraterritorial | 1962 |
| Wilson Connolly Quest Limited | Extraterritorial | 2002 |
| Wilson Elite Chauffeur Services Limited | Transport & logistics | 2010 |
| Wilsons and Davids Limited | Professional & scientific | 2012 |
| Wilsons Horticultural Maintenance Ltd | Manufacturing | 2006 |
| Wilsons of London Ltd | Transport & logistics | 2024 |
| Wilton Crescent Apartments Limited | Real estate | 2025 |
| Wimborne Five Limited | Real estate | 2023 |
| Wimgrove Developments Limited | Extraterritorial | 1958 |
| Wimgrove Property Trading Limited | Extraterritorial | 1991 |
| Wimpey Construction Developments Limited | Extraterritorial | 1989 |
| Wimpey Construction Overseas Limited | Extraterritorial | 1989 |
| Wimpey Corporate Services Limited | Professional & scientific | 1995 |
| Wimpey Dormant Investments Limited | Professional & scientific | 1959 |
| Wimpey Geotech Limited | Extraterritorial | 1988 |
| Wimpey Group Services Limited | Extraterritorial | 1978 |
| Wimpey Gulf Holdings Limited | Extraterritorial | 1964 |
| Wimpole Printing Limited | Information & communication | 2005 |
| WIN Property Ltd | Hospitality | 2022 |
| Winchester Court Management Company Limited | Households | 1987 |
| Windew Company Ltd | Real estate | 2019 |
| Windew Partnership LLP | | 2019 |
| Windmill Estate Maintenance Company Limited | Households | 1971 |
| Window Doctor Installation Services Ltd | Manufacturing | 2020 |
| Window Doctor Repair Services Ltd | Manufacturing | 2016 |
| Windows Displays Limited | Wholesale & retail | 2002 |
| Windows Doors and Bifolds Ltd | Construction | 2014 |