| Water Technologies U.K. Ltd | Financial services | 2013 |
| Waymakers Legal Limited | Professional & scientific | 2025 |
| WE Evoke Limited | Information & communication | 2012 |
| WE Source Property Deals Ltd | Real estate | 2019 |
| Wentwood Group Ltd | Financial services | 2026 |
| Wentwood Timber Centre Limited | Manufacturing | 2011 |
| Wesley House Limited | Other services | 2013 |
| West Access Limited | Extraterritorial | 2010 |
| Westbase 247 Ltd | Information & communication | 2008 |
| Westbase Group Limited | Real estate | 2016 |
| Westbase Technology Solutions Limited | Information & communication | 2008 |
| Western Automotive Ltd | Wholesale & retail | 2019 |
| Westgate Hospitality Consulting Limited | Professional & scientific | 2016 |
| What Mess? Limited | Administrative & support | 2022 |
| Whifbitz Ltd | Manufacturing | 2015 |
| Whitbread Support Services Ltd | Health & social care | 2020 |
| White Arrow Limited | Professional & scientific | 1990 |
| Whitebrook Properties Limited | Real estate | 2016 |
| Whitehead Piping Solutions Limited | Construction | 2008 |
| Wilcrick Design Ltd | Professional & scientific | 2024 |
| Wilcrick Group Ltd | Agriculture & fishing | 2021 |
| Wilcrick VP Ltd | Professional & scientific | 2024 |
| Will Scott Coaching Ltd | Education | 2025 |
| Williams Equine Services Limited | Agriculture & fishing | 2015 |
| Willow Barn Organics Ltd | Agriculture & fishing | 2021 |
| Willow Grange Amenity Company Limited | Construction | 2025 |
| WIN Services Limited | Construction | 2022 |
| Wireless Coverage Ltd | Information & communication | 2018 |
| WM Garden Services Limited | Professional & scientific | 2003 |
| WOK 88 Limited | Hospitality | 2023 |
| Wonderful Wool Ltd | Wholesale & retail | 2024 |
| Wunda Group PLC | Manufacturing | 2006 |
| Wundasmart (UK) Ltd | Wholesale & retail | 2017 |
| WYE Valley Meadery Ltd | Manufacturing | 2017 |
| Wyenottrees Ltd | Hospitality | 2023 |
| Xenia Saunders Consultancy Ltd | Health & social care | 2022 |
| XO Taxis Ltd | Transport & logistics | 2017 |
| Xtreme Gamerz Ltd | Arts & recreation | 2022 |
| Y Cewri Ltd | Professional & scientific | 2026 |
| Yatton Hardware & DIY Ltd | Wholesale & retail | 2017 |
| Yemal Ltd | Hospitality | 2025 |
| Yeomans Property Development Limited | Real estate | 2026 |
| Yogagem Limited | Arts & recreation | 2023 |
| YOU Know IT Makes Sets Limited | Information & communication | 2016 |
| Young Potters Ltd | Manufacturing | 2024 |
| Your Choice Transport Limited | Transport & logistics | 2022 |
| Yuum Ltd | Wholesale & retail | 2021 |
| ZPE Ltd | Professional & scientific | 2018 |
| Zulu Alpha Brewing Limited | Manufacturing | 2013 |