| Watford Orthodontics Ltd | Health & social care | 2008 |
| Watkins Consultancy Limited | Hospitality | 2022 |
| Watson and Ewen Limited | Manufacturing | 1984 |
| Watson Construction Group Ltd | Construction | 2022 |
| Wattlogic Limited | Other services | 2025 |
| Watts Electrical Limited | Construction | 2015 |
| Watts Engineering Limited | Construction | 2006 |
| Way Beyond Computing Limited | Information & communication | 1995 |
| Way Mill Pools Limited | Construction | 2006 |
| Waymatt Healthcare Limited | Information & communication | 2025 |
| WBC Cars Ltd | Wholesale & retail | 2024 |
| Wdit Ltd | Information & communication | 2016 |
| WE ARE Knox Ltd | Information & communication | 2024 |
| WE Care Integrated Solutions Limited | Information & communication | 2019 |
| WE Love OUR Beach Ltd | Wholesale & retail | 2020 |
| WE Manage Web Limited | Information & communication | 2020 |
| Wealth Finesse Limited | Financial services | 2024 |
| Weatherall Equipment & Instruments Limited | Professional & scientific | 1981 |
| Web Solutions (UK) Limited | Extraterritorial | 2000 |
| Web-Clubs Digital Limited | Professional & scientific | 2019 |
| Webschemas Associates Limited | Information & communication | 2010 |
| Wegraft Limited | Information & communication | 2018 |
| Weldpold Limited | Manufacturing | 2014 |
| Well Sync Innovations Limited | Information & communication | 2024 |
| Wellbuild Construction Services Limited | Agriculture & fishing | 1999 |
| Wells Property Services Ltd | Administrative & support | 2009 |
| Wells Risk Consulting Limited | Professional & scientific | 2010 |
| Wellspring Apprenticeship Training Centre UK CIC | Hospitality | 2023 |
| Wellspring Training Centre Ltd | Education | 2023 |
| Wendover Beers Ltd | Manufacturing | 2018 |
| Wendover Community News CIC | Information & communication | 2023 |
| Wendover Financial Limited | Financial services | 2008 |
| Wendover Superbikes Limited | Wholesale & retail | 2025 |
| Wendover Technology Ltd. | Professional & scientific | 2008 |
| Wendover Youth Centre Limited | Health & social care | 2011 |
| Wentworth Miller Property Ltd | Real estate | 2023 |
| Were Wood Farm Ltd | Wholesale & retail | 2025 |
| Wesh Worldwide Ltd | Information & communication | 2024 |
| Wesoldit Limited | Real estate | 2020 |
| West END Place Residents Association Limited | Other services | 2002 |
| West Hampstead Imaging Partnership Limited | Health & social care | 2018 |
| West Medical Aesthetics Ltd | Health & social care | 2020 |
| West One Flooring Group Limited | Construction | 2022 |
| West One Flooring Limited | Construction | 2013 |
| West Wind Real Estate Ltd | Real estate | 2023 |
| Westben Consultancy Limited | Professional & scientific | 2026 |
| Westbrook Property Investments Limited | Real estate | 2004 |
| Westcol Limited | Arts & recreation | 1973 |
| Westcott Ground Maintenance Limited | Administrative & support | 2015 |
| Westcott Shared Facilities Limited | Professional & scientific | 2023 |
| Westcott Social Club Limited | Hospitality | 1994 |
| Westfield Fasteners Limited | Wholesale & retail | 2010 |
| Westgrove Beauty Ltd | Other services | 2017 |
| Westlim Construction Limited | Construction | 2016 |
| Westluke Limited | Information & communication | 2017 |
| Westmill Place Management Company Limited | Households | 2021 |
| Westminster King Productions Limited | Information & communication | 1990 |
| Weston Court Freehold Company Limited | Real estate | 2018 |
| Weston Road Management Company Limited | Households | 1989 |
| Weston Turville Stores Ltd | Wholesale & retail | 2020 |
| Westside Land Limited | Real estate | 1995 |
| Westwing Solicitors Ltd | Professional & scientific | 2021 |
| Westworld Services Limited | Construction | 2019 |
| Wewantassets Ltd | Real estate | 2025 |
| WFM Consulting Ltd | Professional & scientific | 2025 |
| What the Farq Productions Ltd | Information & communication | 2023 |
| Where to Sell Limited | Professional & scientific | 2015 |
| Whippy Delights Ltd | Transport & logistics | 2024 |
| White & Sons Contracting Ltd | Real estate | 2024 |
| White Barn Therapy Limited | Health & social care | 2021 |
| White Glove Rentals Ltd | Real estate | 2023 |
| White Haulage Ltd | Transport & logistics | 2014 |
| White Lion Banbury Residents Limited | Households | 2018 |
| White Lion Walk Management Limited | Real estate | 2003 |
| White Swan Asset Management Ltd | Real estate | 2025 |
| White Vision Limited | Other services | 2010 |
| White Wizard Ltd | Other services | 2025 |
| Whitecross Business Solutions Ltd | Professional & scientific | 2010 |
| Whitehound Property Management Company Limited | Real estate | 2011 |
| Whitehouse Transport Ltd | Transport & logistics | 2019 |
| Whitwosp Limited | Manufacturing | 2014 |
| Who’S Company Ltd | Other services | 2022 |
| WHY Money Matters Ltd | Financial services | 2012 |
| Wichert Associates Wealth Management LLP | | 2016 |
| Wickham Field (Wingrave) Management Company Ltd | Households | 2021 |
| Widegate Developments Limited | Financial services | 2001 |
| Wight Properties Ltd | Administrative & support | 2017 |
| Wild & Organic Bioactive Essentials Limited | Manufacturing | 2007 |
| Wild & Organic Limited | Extraterritorial | 2013 |
| Wild Daisy TM Limited | Manufacturing | 2021 |
| Wildelder Limited | Wholesale & retail | 2009 |
| Wildlife Planet Limited | Information & communication | 2014 |
| Wildwood Wonders Ltd | Education | 2024 |
| Wilfred Windows Limited | Manufacturing | 2020 |
| Wilkins Solicitors LLP | | 2010 |
| Wilkins Woodwork Limited | Construction | 2019 |
| Wilkinson Construction Limited | Construction | 2019 |
| Will Howard Strategic Advisory Limited | Professional & scientific | 2025 |
| Will Itconsult Limited | Information & communication | 2010 |
| Willen Park Ltd | Real estate | 2013 |