| Wildflower Bay Publishing Limited | Information & communication | 2024 |
| Wildkat Ltd | Information & communication | 2020 |
| Wildwaters Seafood Ltd | Wholesale & retail | 2019 |
| Wilfred Marshall Limited | | 1946 |
| Wilkie Consulting Services Limited | Professional & scientific | 2016 |
| Wilkinson J Limited | Professional & scientific | 2025 |
| Wilkinson Legal and Professional Services Ltd | Professional & scientific | 2021 |
| Wilkinson Plastering Ltd | Construction | 2019 |
| Wilkinson Roofing Group Ltd | Construction | 2025 |
| Wilks Trades Ltd | Wholesale & retail | 2024 |
| Will and Ways Solution Limited | Professional & scientific | 2022 |
| Will Howe Creative Limited | Professional & scientific | 2010 |
| Willan Properties NO1 Limited | Other services | 2013 |
| Willan Properties NO2 Limited | Other services | 2013 |
| Willan Trustee Limited | Administrative & support | 2008 |
| Willcuisine Limited | Hospitality | 2026 |
| William Hynes Limited | Construction | 2022 |
| William Leech (Investments) Limited | Financial services | 1953 |
| William Leech Foundation Limited(The) | Financial services | 1960 |
| William Leiper & SON Limited | Water & waste | 2005 |
| Williams & Griffin Limited | Professional & scientific | 1962 |
| Williams & Spenceley Limited | Health & social care | 1986 |
| Williams Property Rental NE Limited | Real estate | 2023 |
| Williamsform Limited | Administrative & support | 2022 |
| Williamson Construction Equipment Limited | Administrative & support | 1985 |
| Willmore Management Ltd | Administrative & support | 2023 |
| Willow Deen Ltd | Wholesale & retail | 2025 |
| Willow's Care Newcastle Ltd | Administrative & support | 2026 |
| Willowbean Residential Ltd | Real estate | 2021 |
| Willowcroft Limited | Real estate | 2012 |
| Willows (Newton) Limited | Real estate | 2020 |
| Willows Residential Limited | Real estate | 2025 |
| Willus Outdoor Co Ltd | Other services | 2026 |
| Wilson @ Work Ltd | Construction | 2018 |
| Wilson Accountants Ltd | Professional & scientific | 2007 |
| Wilson Defraine Lettings Ltd | Hospitality | 2008 |
| Wilson Defraine Management Ltd | Real estate | 2021 |
| Wilson Defraine Property Maintenance Limited | Administrative & support | 2013 |
| Wilson Defraine Sales Limited | Real estate | 2013 |
| Wilson Delisle Limited | Construction | 2021 |
| Wilson Gray Consulting Ltd | Professional & scientific | 2015 |
| Wilson Harper Holdings Limited | Financial services | 2026 |
| Wilson Heat Services Limited | Construction | 2022 |
| Wilson Properties NE Ltd | Real estate | 2022 |
| Wilson Stays Ltd | Hospitality | 2023 |
| Wilton Gilbert Limited | Administrative & support | 2020 |
| Wilts & Dorset Holdings Limited | Professional & scientific | 1987 |
| Wilts & Dorset Investments Limited | Professional & scientific | 2002 |
| Wilts and Dorset BUS Company Limited | Professional & scientific | 1982 |
| Wiltshire Gardens Management Company Limited | Real estate | 2006 |
| WIN LA Property Limited | Real estate | 2022 |
| Winch Properties Limited | Hospitality | 2023 |
| Wincott Developments Ltd | Real estate | 2021 |
| Wincott Holdings Ltd | Real estate | 2023 |
| Wind Blade Repair Services Ltd | Manufacturing | 2022 |
| Wind Energy Marine Limited | Transport & logistics | 2016 |
| Windbar Properties Ltd | Real estate | 2026 |
| Windcore Ltd | Professional & scientific | 2025 |
| Windel Energy Ltd | Professional & scientific | 2018 |
| Windel Grid 1 Limited | Energy | 2021 |
| Windel Grid 2 Limited | Energy | 2023 |
| Windel Solar 11 Ltd | Energy | 2021 |
| Windel Solar 12 Ltd | Energy | 2021 |
| Windel Solar 14 Ltd | Energy | 2021 |
| Windel Solar 6 Ltd | Energy | 2020 |
| Windel Solar 9 Ltd | Energy | 2020 |
| Windermere Consultants (2000) Limited | Other services | 1996 |
| Windev Projects Ltd | Construction | 2020 |
| Windfall Homes Ltd | Construction | 2018 |
| Windle Creative Ltd | Administrative & support | 2004 |
| Windmill Property North Ltd | Real estate | 2016 |
| Window Installer Sales LAB Ltd | Other services | 2016 |
| Windsors NCL Ltd | Financial services | 2025 |
| Wingbox Worldwide Limited | Hospitality | 2016 |
| Wingrove Legal Ltd | Professional & scientific | 2023 |
| Wingrove Lettings Limited | Real estate | 2005 |
| Wingrove Van Centre Limited | Wholesale & retail | 2025 |
| Wings Healthcare Recruitment Limited | Administrative & support | 2020 |
| Wings HUT Ltd | Hospitality | 2025 |
| Wings Investment Limited | Professional & scientific | 2004 |
| Winn Holding Limited | Administrative & support | 2012 |
| Winn Holding Midco Limited | Administrative & support | 2025 |
| Winn Investments Limited | Financial services | 2022 |
| Winn Solicitors Limited | Professional & scientific | 2004 |
| Winners Progressive Enterprise Ltd | Wholesale & retail | 2016 |
| Winnie's Bakery and Patisserie Limited | Manufacturing | 2025 |
| Winning Post Events Ltd | Hospitality | 2022 |
| Winnings Estate Limited | Real estate | 2014 |
| Winns Coaches Ltd | Transport & logistics | 2011 |
| Wintrip Developments Limited | Real estate | 1986 |
| Wipe OUT Holdings Ltd | Information & communication | 2023 |
| Wirewills Equestrian Services Limited | Other services | 2018 |
| Wisdom Finance Limited | Financial services | 2018 |
| Wisdome Ltd | Professional & scientific | 2025 |
| Wise Galleria Limited | Wholesale & retail | 2024 |
| Wiseton Court Residents Association Limited | Real estate | 1991 |
| Wiseway NE Ltd | Hospitality | 2022 |
| Wish TM Trading Limited | Financial services | 2025 |
| Wisteria Hospitality Ltd | Hospitality | 2026 |
| Wistl Group Ltd | Professional & scientific | 2020 |