| Wellbeone Limited | Health & social care | 2019 |
| Wellnessessence Ltd | Wholesale & retail | 2025 |
| Wellzy My Life Ltd | Wholesale & retail | 2026 |
| Welnessa Ltd | Wholesale & retail | 2025 |
| Wemoveon Ltd | Wholesale & retail | 2016 |
| Wencan Limited | Wholesale & retail | 2025 |
| Wenchao YE Ltd | Wholesale & retail | 2025 |
| Wendao Kuajing Limited | Wholesale & retail | 2025 |
| Wendao Ltd | Wholesale & retail | 2025 |
| Wenextfarm Ltd | Wholesale & retail | 2024 |
| Weng Shuo Ltd | Manufacturing | 2025 |
| Wenkai WU Ltd | Wholesale & retail | 2025 |
| Wentang Group Limited | Financial services | 2025 |
| Wentworth Care Ltd | Health & social care | 2021 |
| Wenwenlords Ltd | Information & communication | 2025 |
| Werenox Ltd | Information & communication | 2017 |
| Werse Wibe Ltd | Wholesale & retail | 2025 |
| West River Materia Medica Biotechnology Limited | Wholesale & retail | 2026 |
| Westait Ltd | Wholesale & retail | 2025 |
| Westep Technology Company Limited | Extraterritorial | 2014 |
| Western Order Chemical (UK) Co., Ltd | Extraterritorial | 2019 |
| Westernaffair Ltd | Manufacturing | 2019 |
| Westfordstrategies Ltd | Professional & scientific | 2026 |
| Westmere Retail Limited | Wholesale & retail | 2026 |
| Weston Super Mare Couriers Ltd | Transport & logistics | 2019 |
| Weststone Tech Ltd | Manufacturing | 2024 |
| Westwards Print Limited | Wholesale & retail | 2021 |
| Wetour Centre Limited | Education | 2016 |
| Wexley Limited | Other services | 2018 |
| Weyge Cloud Innovation Ltd | Wholesale & retail | 2025 |
| WF FEI Limited | Wholesale & retail | 2024 |
| WG Site Services Ltd | Construction | 2021 |
| Wgzyh Ltd | Wholesale & retail | 2025 |
| Whatmusic Worldwide Limited | Information & communication | 2000 |
| Wheelwise Auto Ltd | Wholesale & retail | 2025 |
| Wherewechat Online Services Limited | Information & communication | 2024 |
| Whickham Smith Assets Ltd | Professional & scientific | 2005 |
| Whimsy Thread Ltd | Professional & scientific | 2024 |
| Whisker Gallery Limited | Manufacturing | 2025 |
| Whiskers and Hearth Ltd | Wholesale & retail | 2025 |
| White Bridge Data Limited | Information & communication | 2026 |
| White Dog Properties Ltd | Real estate | 2026 |
| White Flamingo Consulting Ltd | Wholesale & retail | 2025 |
| White Heron Brands Limited | Manufacturing | 2016 |
| White Horse Retail Limited | Wholesale & retail | 2019 |
| White House Park (Barnt Green) Management Company Limited | Households | 1994 |
| White Sigma Co., Ltd | Wholesale & retail | 2025 |
| White Valuations and Consulting Ltd | Other services | 2014 |
| Whitebridge Media Ltd | Administrative & support | 2013 |
| Whitedit Ltd | Manufacturing | 2025 |
| Whiteeth Oral Health Research Co., Ltd | Wholesale & retail | 2024 |
| Whitlie HR Consulting Ltd | Professional & scientific | 2025 |
| Whittern Farms Limited(The) | Agriculture & fishing | 1952 |
| WHO LE SIS Ltd | Manufacturing | 2025 |
| Wholesale Scented Candles Ltd | Other services | 2017 |
| Wholesome Wellbeing Ltd | Health & social care | 2024 |
| Wholsa Limited | Manufacturing | 2025 |
| WHY Counselling Limited | Health & social care | 2023 |
| WHY DO Horses Ltd | Education | 2024 |
| Whyhs Limited | Wholesale & retail | 2025 |
| Whyso Clothing Ltd | Wholesale & retail | 2026 |
| Wicked Creations Limited | Information & communication | 2001 |
| Wicked Nights Digital Ltd | Information & communication | 2025 |
| Widersight Limited | Information & communication | 2018 |
| Widlysun Business Services Ltd | Wholesale & retail | 2021 |
| Wilbury House Limited | Administrative & support | 2005 |
| Wild Lava Health Ltd | Wholesale & retail | 2025 |
| Wild One Collective Ltd | Wholesale & retail | 2025 |
| Wild Rayne Magick Ltd | Information & communication | 2026 |
| Wild Rose Craft Ltd | Wholesale & retail | 2025 |
| Wild Spring Ltd | Agriculture & fishing | 2025 |
| Wilde Collective Ltd | Professional & scientific | 2020 |
| Wildeye Adventures Limited | Education | 2016 |
| Wildlife Trails Ltd | Administrative & support | 1999 |
| Will & SR Ltd | Wholesale & retail | 2024 |
| Will Ying Co., Ltd | Wholesale & retail | 2024 |
| William Powell & Son(Sunset,Kington)Limited | | 1960 |
| William Recruitment Limited | Transport & logistics | 2025 |
| William Wynne Limited | Professional & scientific | 2024 |
| Willow Books Cove Ltd | Wholesale & retail | 2014 |
| Willow Tree Court (Wembley) RTM Company Limited | Other services | 2011 |
| Wills Precious Tcg's Ltd | Wholesale & retail | 2024 |
| Wilson Electrical Contractors Ltd | Construction | 2016 |
| Wiltshire Bees & Honey Ltd | Agriculture & fishing | 2025 |
| WIN Every Proposal Ltd | Professional & scientific | 2025 |
| WIN in the Future Clothing Co., Ltd | Wholesale & retail | 2025 |
| Wind & Compass Ltd | Information & communication | 2025 |
| Windingtravel Ltd | Administrative & support | 2024 |
| Windmill ADS Ltd | Information & communication | 2024 |
| Windsock Bike Hire Ltd | Administrative & support | 2024 |
| Windy Play Ltd | Wholesale & retail | 2025 |
| Wingmetals Group Limited | Wholesale & retail | 2021 |
| Wingming Innovations Ltd | Wholesale & retail | 2024 |
| Wings and Wins Ltd | Wholesale & retail | 2020 |
| Wingsmmd Ltd | Professional & scientific | 2025 |
| Wink Media Solution Limited | Wholesale & retail | 2025 |
| Winkywardrobe Co., Ltd | Wholesale & retail | 2025 |
| Winnals Trading Limited | Wholesale & retail | 2026 |
| Winners Auto Parts Import and Export Co., Ltd | Administrative & support | 2023 |
| Winners Live Strong FC Ltd | Arts & recreation | 2026 |