| Walnut Automated Spaces Ltd | Wholesale & retail | 2024 |
| Walpole Road Slough (Open Space) Residents Association Limited | Households | 1993 |
| Walpole Road Slough (Phase 1) Management Company Limited | Households | 1993 |
| Walpole Road Slough (Phase 2) Management Company Limited | Households | 1996 |
| Walthlynn Limited | | 1982 |
| Walton and Green Electrical Services Ltd | Construction | 2017 |
| Wanderlust Marketing Ltd | Professional & scientific | 2023 |
| Wanderlust World Ltd | Information & communication | 2023 |
| Warden Court Luton Management Co Limited | Households | 2002 |
| Wardman Communications Limited | Administrative & support | 2003 |
| Warfield Chase Management Company Limited | Real estate | 2005 |
| Warfield Properties Ltd | Real estate | 2021 |
| Waroeng Windsor Ltd | Wholesale & retail | 2022 |
| Warren Property Matters Limited | Real estate | 2013 |
| Warwick Casa Limited | Information & communication | 2019 |
| Warwick Court (Windsor) Management Company Limited | Households | 1999 |
| Wash Windsor Limited | Other services | 2011 |
| Water Forensics Limited | Information & communication | 2008 |
| Water Life Sports Ltd | Wholesale & retail | 2023 |
| Waters Edge (Mytchett) Management Company Limited | Households | 2022 |
| Waterside Bidco Limited | Financial services | 2021 |
| Waterside Midco Limited | Financial services | 2021 |
| Waterside Topco Limited | Financial services | 2021 |
| Watersmeet Property Management Company Limited | Households | 2001 |
| Waterworks Pros Limited | Construction | 2026 |
| Watlington Court Residents Company Limited | Real estate | 1974 |
| Watson's Dairies Limited | Manufacturing | 1993 |
| Wavefront Asset Management Ltd | Financial services | 2017 |
| Wavefront Leasing Ltd | Financial services | 2020 |
| Wayne Industries Ltd | Arts & recreation | 2018 |
| Wayseal Holdings Limited | Real estate | 2002 |
| Wayseal Investments Limited | Professional & scientific | 2002 |
| Wayseal Properties Limited | Real estate | 1976 |
| Wayseal Property Investments Limited | Real estate | 1977 |
| Wclark Estates Limited | Real estate | 2024 |
| Wcms Limited | Professional & scientific | 2008 |
| WE ARE IX Ltd | Information & communication | 2025 |
| WE ARE Production Ltd | Arts & recreation | 2020 |
| WE ARE Sentience Ltd | Professional & scientific | 2024 |
| WEARE3FOLD Ltd | Arts & recreation | 2018 |
| Web Marketing Consultants Ltd. | Information & communication | 2005 |
| Webcoder Ltd | Information & communication | 2008 |
| Webdefender Limited | Information & communication | 2010 |
| Weben Partners Limited | Professional & scientific | 2008 |
| Webkatie Ltd | Professional & scientific | 2025 |
| Webrew Taverns Limited | Hospitality | 2014 |
| Webtags LLP | | 2018 |
| Webuyanyscrapmetal.Com Ltd | Water & waste | 2010 |
| Weinsureyou Ltd | Financial services | 2019 |
| Wellingrove Estates Limited | Real estate | 2008 |
| Wellingrove Properties Limited | Real estate | 2003 |
| Wellington Lodge (Winkfield) Management Company Limited | Households | 2001 |
| Wellingtone Limited | Professional & scientific | 2001 |
| Wellingtone Properties Limited | Real estate | 2024 |
| Wellingtons Antiques Limited | Wholesale & retail | 2019 |
| Wellingtons for Langley Hall Limited | Education | 2012 |
| Wellstone Engineering Limited | Manufacturing | 2014 |
| Wentworth Maintenance Ltd | Administrative & support | 2009 |
| Wentworth Manor (Operations) Limited | Real estate | 2009 |
| Wentworth Music Ltd | Education | 2019 |
| WEP Worldwide Limited | Arts & recreation | 1996 |
| Wessex Court (Windsor) Limited | Real estate | 1999 |
| West 11 Design Limited | Construction | 2011 |
| West 11 London Ltd | Real estate | 2026 |
| West 11 Projects Ltd | Real estate | 2026 |
| West Ruislip (Block F) Management Company Limited | Households | 1983 |
| West Ruislip (Block F) RTM Company Limited | Households | 2011 |
| West Ruislip(Block G)Management Company Limited | Administrative & support | 1985 |
| West Ruislip(Block J)Management Company Limited | Households | 1984 |
| Westcraft Limited | Construction | 2012 |
| Westlakes Estate Agents Ltd | Real estate | 2022 |
| Westlancs Property Company Limited | Real estate | 1993 |
| Westland Managing Ltd | Real estate | 2015 |
| Westminster Fields Residents Management Company Limited | Households | 2017 |
| Westview Homes Limited | Construction | 2011 |
| Wexham Park Hall Ltd | Real estate | 2009 |
| Weybridge Sprint Limited | Construction | 2019 |
| Weyside Grove Residents Management Company Limited | Households | 2021 |
| WG 1 Ltd | Construction | 2021 |
| Whales Yard Committee Limited | Households | 2000 |
| What Digital (UK) Ltd | Professional & scientific | 2018 |
| Whatjobs (UK) Ltd | Information & communication | 2020 |
| Wheatbutts Tenants Association Limited | Real estate | 2007 |
| Wheatley Property Search Ltd | Real estate | 2020 |
| White Cliffs Consultants Limited | Other services | 2018 |
| White Heather Garage (Dorney) Limited | Professional & scientific | 1979 |
| White Lilies Management Company Limited | Other services | 1973 |
| White Zone Ltd | Construction | 2017 |
| Whitegates Close Residents Company Limited | Households | 2005 |
| Whitegates Residents Management Company Limited | Households | 2022 |
| Whitemead Accountants Limited | Professional & scientific | 2021 |
| Whittington Gate M.C. Limited | Households | 2024 |
| Wholesale Solutions Group Limited | Wholesale & retail | 2015 |
| WHY NOT Fundraising Limited | Other services | 2020 |
| Wick Hill House Management Company Limited(The) | Professional & scientific | 1985 |
| Wickham Rise (Speldhurst) Management Company Limited | Households | 2021 |
| Widbrook Road Residents Management Company Limited | Households | 2018 |
| Widen Coast Ltd | Wholesale & retail | 2025 |
| Wider Than the Sky Ltd | Arts & recreation | 2024 |
| Wifi Protected Ltd | Information & communication | 2024 |