| Wilson Chan Limited | Administrative & support | 2007 |
| Wilson French & Partners Limited | Administrative & support | 2021 |
| Wilsons Investment Ltd | Construction | 2015 |
| Wilton Place Residents Association (Harrow) Limited | Households | 1961 |
| WIM Const-Serv Ltd | Construction | 2025 |
| Wimbit Properties Limited | Real estate | 2015 |
| Wimbit Solutions Limited | Information & communication | 2013 |
| Wimbledon Endodontics Ltd | Health & social care | 2024 |
| Wimbledon Padel Limited | Wholesale & retail | 2025 |
| Wimshurst Family Partnership LLP | | 2024 |
| Winby Ltd | Wholesale & retail | 2023 |
| Winchester Hill Business Park (Management Company) Limited | Households | 2023 |
| Winchester Hill Business Park Ltd | Construction | 2020 |
| Winchester Investment Portfolio UK Limited | Real estate | 2020 |
| Windlop Limited | Transport & logistics | 2012 |
| Windmill Cottages Close Limited | Construction | 2025 |
| Window Chic Ltd | Manufacturing | 2014 |
| Window to Luxury Limited | Administrative & support | 2011 |
| Window World Systems Ltd | Construction | 1994 |
| WINDOWS4LIFE Ltd | Construction | 2022 |
| Windrush London Limited | Real estate | 2013 |
| Windsor Glass Company Limited | Manufacturing | 1951 |
| Windsor Laser Clinic Limited | Health & social care | 2010 |
| Wine Corner Trade Ltd | Wholesale & retail | 2023 |
| Winfresh Construction Limited | Construction | 2024 |
| Wing (Cricklewood) Limited | Wholesale & retail | 2007 |
| Wingcraze Limited | Hospitality | 2024 |
| Wings & Grill Ltd | Hospitality | 2026 |
| Winkley General Traders Ltd | Wholesale & retail | 2025 |
| Winkley Properties Ltd | Real estate | 2021 |
| Winn Exim Ltd | Wholesale & retail | 2022 |
| Winner Imports Ltd | Wholesale & retail | 2023 |
| Winners Workshop Ltd | Education | 2020 |
| Winners Yard UK Limited | Wholesale & retail | 2024 |
| Winnie Dimples Limited | Professional & scientific | 2019 |
| Wino Forever Ltd | Hospitality | 2019 |
| Winsagems Ltd | Wholesale & retail | 2025 |
| Winslow Holdings Limited | Real estate | 2023 |
| Winson Green News Ltd | Wholesale & retail | 2020 |
| Winston's Health Campaign Ltd | Wholesale & retail | 2021 |
| Winstratics Ltd | Professional & scientific | 2022 |
| Winterguard Investments Limited | Real estate | 2024 |
| Winterguard Solutions Limited | Professional & scientific | 2024 |
| Winters (Tenterden) Limited | Real estate | 2000 |
| Winton Gardens Residents Association Limited | Households | 1963 |
| Wiredwrong Limited | Wholesale & retail | 2026 |
| Wisdo Ltd | Health & social care | 2025 |
| Wise Academy | Education | 2013 |
| Wise Choice Properties Limited | Hospitality | 2009 |
| Wise Dental Limited | Health & social care | 2007 |
| Wise Hub Ltd | Real estate | 2020 |
| Wise Leap Technologies Ltd | Information & communication | 2025 |
| Wise Mart Limited | Health & social care | 2023 |
| Wisefacts Ltd | Wholesale & retail | 2023 |
| Wisefer Limited | Information & communication | 2008 |
| Wisetech Electrical Contractors Limited | Construction | 2013 |
| Wisevision Limited | Transport & logistics | 1997 |
| Wishfulfilling GEM Ltd | Real estate | 2025 |
| Wishfull Words Ltd | Wholesale & retail | 2024 |
| Wishio Limited | Administrative & support | 2018 |
| Wishmax Commodities Ltd | Wholesale & retail | 2020 |
| Wislana Properties Ltd | Real estate | 2021 |
| Wissen Technology Limited | Information & communication | 2022 |
| Wisteria Restaurants Limited | Hospitality | 2013 |
| Witmeg Technologies Limited | Information & communication | 2024 |
| Wiwikau Ltd | Information & communication | 2020 |
| WIX SLA Ltd | Information & communication | 2025 |
| Wize Properties Limited | Real estate | 2019 |
| Wjsp Properties Ltd | Real estate | 2019 |
| WJY Calligraphy Ltd | Wholesale & retail | 2025 |
| Wkmg Limited | Construction | 2024 |
| Wksy Limited | Real estate | 2020 |
| WL Autos Ltd | Wholesale & retail | 2023 |
| WL Search & Selection Ltd | Administrative & support | 2019 |
| WLR Homes Ltd | Real estate | 2022 |
| WLW Consulting Limited | Administrative & support | 2024 |
| WM & Sons Motors Ltd | Wholesale & retail | 2025 |
| WMA Services Ltd | Other services | 2018 |
| WN Friends Limited | Administrative & support | 2015 |
| Wnzi Ltd | Real estate | 2024 |
| WO Property Holdings Ltd | Real estate | 2025 |
| Woburn CT Holdings Limited | Real estate | 2026 |
| Wodo Serviceline Limited | Health & social care | 2004 |
| Wojciech Commerce Limited | Wholesale & retail | 2025 |
| WOK and Slice Limited | Hospitality | 2020 |
| WOK Chinese Takeaway Ltd | Hospitality | 2018 |
| WOK S Roll Ltd | Hospitality | 2026 |
| Wokandspice Restaurant Ltd | Hospitality | 2025 |
| Wolf Wisdom Limited | Hospitality | 2015 |
| Wolfborne Ltd | Manufacturing | 2026 |
| Wolfcrest Limited | Real estate | 2024 |
| Wolff Art Limited | Wholesale & retail | 2026 |
| Wolford London Limited | Wholesale & retail | 1963 |
| Wollaton Estates LLP | | 2007 |
| Wolseley London Limited | Real estate | 2016 |
| Wolverton Mansions (Uxbridge Road) Limited | Households | 1991 |
| Wolvesiyi Services Ltd | Transport & logistics | 2025 |
| Women Beyond Walls C.I.C. | Information & communication | 2024 |
| Women in Art Fair CLG | Arts & recreation | 2025 |
| Women in Art Fair Limited | Arts & recreation | 2023 |