| Westcott Consulting Limited | Professional & scientific | 2018 |
| Weweed Community Interest Company | Administrative & support | 2022 |
| Wharfdale Strauss Ltd | Wholesale & retail | 2014 |
| WHD BIX Management Ltd | Households | 2020 |
| Whenuapai Ltd | Real estate | 2022 |
| Where Eagles Dare Ltd | Professional & scientific | 2020 |
| Whisky UK Limited | Professional & scientific | 2003 |
| White Coat Consultancy Ltd | Professional & scientific | 2024 |
| Whitecross Construction Ltd | Construction | 2023 |
| Whizdeal Limited | Real estate | 1999 |
| Whizprint Ltd | Manufacturing | 2023 |
| Widbrook Developments LLP | | 2009 |
| Widbrook Homes Ltd | Construction | 2018 |
| Wijdan Security Services Ltd | Administrative & support | 2023 |
| Wilcox Brothers Limited | Wholesale & retail | 2021 |
| Wild Frog Bakery Ltd | Manufacturing | 2020 |
| Wild Nest Limited | Professional & scientific | 2022 |
| Wildlife Law Ltd | Professional & scientific | 2024 |
| Wilkins Court (Henley on Thames) Management Company Limited | Households | 2019 |
| William Lazarus Associates Limited | Professional & scientific | 2012 |
| William Marshal Knight LLP | | 2025 |
| Willow Green (London) Ltd | Real estate | 2025 |
| Wilton Couriers Ltd | Administrative & support | 2017 |
| Wilton Transport Holdings Limited | Financial services | 2025 |
| Wilton Transport Limited | Transport & logistics | 2006 |
| Wind Power Resources Limited | Professional & scientific | 2007 |
| Windala Limited | Manufacturing | 2008 |
| Windsar Belle Limited | Transport & logistics | 2020 |
| Windsor Court(Chiswick)Management Company Limited | Administrative & support | 1984 |
| Windsor Tourist Guides Limited | Arts & recreation | 2007 |
| Windy Haugh Freehold (Newbury) Limited | Households | 2013 |
| Windy Haugh Residents Management Limited | Households | 1983 |
| Wine Guild of the United Kingdom | Other services | 1984 |
| Wine Guild Trustees Limited | Administrative & support | 2003 |
| Wingu Consulting Ltd | Information & communication | 2017 |
| Winnersh Properties Limited | Construction | 2007 |
| Winsbury TV Limited | Information & communication | 2016 |
| Winstel Technologies Limited | Information & communication | 2023 |
| Winter Hill (MJ) Limited | Professional & scientific | 2006 |
| Winter Hill (SG) Limited | Financial services | 2006 |
| Wiseguys Group Ltd | Information & communication | 2026 |
| Wiser Minds Limited | Real estate | 2002 |
| WJF Consulting Ltd | Information & communication | 2021 |
| Wokingham Glazing and Window Company Limited | Construction | 2017 |
| Wonder Vision Limited | Information & communication | 2010 |
| Wood Designer Ltd | Information & communication | 2013 |
| Wooden Handle Co Ltd | Arts & recreation | 2020 |
| Woodfarm Gate Management Company Limited | Households | 1991 |
| Woodland Place (Nettlebed) Management Company Limited | Households | 2013 |
| Woolfson & Woolfson Ltd | Professional & scientific | 2013 |
| Wordsview Ltd | Professional & scientific | 2009 |
| Working: Communication Strategies Limited | Professional & scientific | 2004 |
| Write for Results Limited | Education | 2006 |
| Wyndale Close Residents Property Company Limited(The) | Households | 1982 |
| Wynne-Ellis Hair Ltd | Other services | 2025 |
| X-Venture Limited | Professional & scientific | 2002 |
| XP 11 Development Ltd | Real estate | 2025 |
| XP 12 Development Ltd | Real estate | 2025 |
| XP 14 Development Ltd | Real estate | 2025 |
| XP 3 Developments Ltd | Construction | 2021 |
| XP 4 Developments Limited | Real estate | 2021 |
| XP 7 Development Limited | Real estate | 2022 |
| XP 8 Developments Limited | Real estate | 2022 |
| XP 9 Development Ltd | Real estate | 2023 |
| XP Estates Limited | Construction | 2020 |
| XP Property Ltd | Construction | 2018 |
| XP Surveys Limited | Professional & scientific | 2021 |
| XP5 Development Limited | Construction | 2022 |
| XPE Comm Ltd | Construction | 2024 |
| XPE Resi Ltd | Real estate | 2025 |
| Xyloptics Limited | Extraterritorial | 2025 |
| YA Taxis Limited | Transport & logistics | 2007 |
| Yarnells Road Residents Limited | Households | 2000 |
| Yarnton Court Management Company Limited | Households | 1982 |
| Yewden Farm Buildings Management Company Limited | Households | 1993 |
| YGB Publishing Limited | Information & communication | 2007 |
| Yorkshire Oils Ltd | Wholesale & retail | 2014 |
| Your Perfect Day Ltd | Wholesale & retail | 2026 |
| Yulp Ltd | Information & communication | 2024 |
| Zanzkar Ltd | Professional & scientific | 2023 |
| Zelos Logistics Ltd | Transport & logistics | 2026 |
| Zhalanna Ltd | Professional & scientific | 2026 |
| ZM Creative Limited | Professional & scientific | 2020 |
| Zondle Ltd | Education | 2018 |
| Zuko Holdings Ltd | Professional & scientific | 2025 |