| Whitecroft Capital Investments LLP | | 2023 |
| Whitecroft Capital Strategic Holdings LLP | | 2025 |
| Whitestone MDM Limited | Real estate | 2025 |
| Whitlogic Digital Ltd | Information & communication | 2022 |
| WHO Cares Consultants UK Ltd | Wholesale & retail | 2024 |
| WHO Lets the Dog OUT TOO Limited | Real estate | 2003 |
| WHO Said IT Would BE Easy Limited | Real estate | 2019 |
| Wholesale Harbor Ltd | Wholesale & retail | 2024 |
| Wholly Limited | Real estate | 2019 |
| WHS Trading Co., Ltd | Extraterritorial | 2014 |
| WHX Material Tech Ltd | Extraterritorial | 2024 |
| Whynot Holdings Limited | Extraterritorial | 2015 |
| Wickham Noakes Court Management Company Limited | Households | 2014 |
| Wickham Road Allotments Ltd | Extraterritorial | 2023 |
| Widson Fluid Systems Limited | Extraterritorial | 2021 |
| Wiest Technology Ltd | Manufacturing | 2021 |
| Wikea Services Limited | Construction | 2025 |
| Wild Canvas Ltd | Hospitality | 2021 |
| Wild Mango (UK) Ltd | Hospitality | 2016 |
| Wild Parties Ltd | Health & social care | 2018 |
| Wild Science Limited | Professional & scientific | 2018 |
| Wilderness Road Maintenance Limited | Other services | 1996 |
| Wildflowers LDN Ltd | Professional & scientific | 2021 |
| Wildflowers Women's Collective CIC | Other services | 2026 |
| Wildman Rituals Ltd | Manufacturing | 2026 |
| Wilk Industrial Limited | Manufacturing | 2025 |
| Will Full Trading Limited | Wholesale & retail | 2024 |
| William Anderson Limited | Extraterritorial | 2011 |
| William FOX Limited | Extraterritorial | 2018 |
| William Southwell Musical Instruments Ltd | Extraterritorial | 2018 |
| William West Limited | Wholesale & retail | 1986 |
| Williman Ltd | Information & communication | 2022 |
| Willow Court (Beckenham) Management Company Limited | Real estate | 1999 |
| Willow's Properties Limited | Real estate | 2018 |
| WIN FAR Chemical Co., Ltd. | Wholesale & retail | 2024 |
| WIN Source Electronics Limited | Manufacturing | 2024 |
| WIN UP Trade Co., Limited | Extraterritorial | 2023 |
| WIN WIN Marine Co., Ltd | Manufacturing | 2021 |
| Win-Ever Industries Co., Ltd. | Extraterritorial | 2012 |
| Win-Win Import & Export (China) Limited | Extraterritorial | 2013 |
| Win-Win International Co., Limited | Extraterritorial | 2006 |
| Winborn & Gajjar Ltd. | Other services | 2009 |
| Winca Ltd | Extraterritorial | 2014 |
| Winchem Co., Ltd | Wholesale & retail | 2023 |
| Winco Global Supply Co., Limited | Manufacturing | 2025 |
| Windrush Associates Limited | Professional & scientific | 2007 |
| Windstar Chemical Co., Ltd. | Extraterritorial | 2017 |
| Wine BAG Co Limited | Wholesale & retail | 2024 |
| Winex Machinery Limited | Extraterritorial | 2020 |
| Winfaith Outdoor Products Co., Ltd. | Extraterritorial | 2022 |
| Wingreat Limited | Manufacturing | 2025 |
| Wings Metal Products Co., Ltd | Extraterritorial | 2022 |
| Winix Ltd | Wholesale & retail | 2024 |
| Winlong Metal Products Co., Ltd. | Manufacturing | 2024 |
| Winly Products Co., Ltd | Extraterritorial | 2021 |
| Winmax Industries Limited | Manufacturing | 2026 |
| Winner Jewelry Co., Limited | Extraterritorial | 2020 |
| Winning Post Arts & Sports Services Limited | Arts & recreation | 2013 |
| Winpal Linking Company Limited | Manufacturing | 2025 |
| Winpower Light (UK) International Ltd | Extraterritorial | 2023 |
| Winshine Import and Export Co., Ltd | Extraterritorial | 2021 |
| Winson Arts & Crafts Co., Ltd | Extraterritorial | 2020 |
| Winsum Electronics Limited | Extraterritorial | 2013 |
| Winsun Company Co., Ltd | Extraterritorial | 2020 |
| Winton Business Group Ltd | Information & communication | 2021 |
| Winton Business Ltd | Extraterritorial | 2021 |
| Wintrust Consulting Limited | Professional & scientific | 2017 |
| Winyoung Manufacture and Trading Co., Ltd | Extraterritorial | 2015 |
| WIP Consulting Limited | Administrative & support | 2017 |
| Wipee Industries Co., Ltd | Extraterritorial | 2017 |
| Wisdom Office Co., Ltd | Extraterritorial | 2014 |
| Wise Gate Finances Ltd | Wholesale & retail | 2024 |
| Wise Guys Beard Mafia Ltd | Wholesale & retail | 2025 |
| Wise Insurance Schemes Limited | Professional & scientific | 1997 |
| Wise Insurance Services Limited | Financial services | 1990 |
| Wise Merit International Limited | Professional & scientific | 2015 |
| Wise Will Corporation Ltd | Extraterritorial | 2013 |
| Wise-Opt Vision Co., Ltd | Extraterritorial | 2013 |
| Wisebooks Limited | Manufacturing | 2020 |
| Wisechild Edutainment Ltd | Information & communication | 2020 |
| Wisechild Productions Ltd | Information & communication | 2020 |
| Wisechild Records Ltd | Information & communication | 2020 |
| Wiselink Medical (UK) Limited | Information & communication | 2024 |
| Wisera Maritech Co., Ltd. | Extraterritorial | 2020 |
| Wisondalt Limited | Extraterritorial | 2021 |
| Wistum Group Limited | Extraterritorial | 2019 |
| Wisuno Global Trading Ltd | Information & communication | 2024 |
| Witherby 1105 Limited | Hospitality | 2017 |
| Wizs Industries Co., Limited | Extraterritorial | 2024 |
| WJS Fuels Ltd | Wholesale & retail | 2023 |
| WJS Logistics Ltd | Transport & logistics | 2021 |
| WJS Power Plant Ltd | Wholesale & retail | 2018 |
| WLT Industrial Co., Ltd | Extraterritorial | 2014 |
| WM Cosmetic Industry Co., Ltd | Extraterritorial | 2018 |
| WNL Industries Co., Ltd. | Extraterritorial | 2021 |
| Wnrji Brand Co., Ltd. | Manufacturing | 2025 |
| Wode Elec Trical Co., Ltd | Extraterritorial | 2017 |
| Wodu Import and Export Co., Ltd | Wholesale & retail | 2021 |
| Wofoo Co., Ltd | Extraterritorial | 2021 |
| Wofoto Group Co., Ltd | Manufacturing | 2023 |