| Wasion Group (Europe) Ltd | Wholesale & retail | 2023 |
| Waste Conquered Consultancy Services Limited | Professional & scientific | 2024 |
| Waste Paper Trade Limited | Professional & scientific | 2009 |
| Waste Protect Ltd | Administrative & support | 2025 |
| Wastesaver Limited | Professional & scientific | 2001 |
| WAT Hanes Limited | Health & social care | 2022 |
| Watch I.P. Limited | Administrative & support | 2011 |
| Waterblind Flood Protection Ltd | Construction | 2014 |
| Waterboost Ltd | Extraterritorial | 2026 |
| Waterdude Studios Ltd | Information & communication | 2020 |
| Watered Roots Ltd | Information & communication | 2023 |
| Waterford Hayes Limited | Information & communication | 2010 |
| Waterfront Books Limited | Information & communication | 2022 |
| Waterfront Living Investments Ltd | Real estate | 2021 |
| Waterloo House Management Company (Wickham Market) Limited | Households | 2011 |
| Waterloo Mews Management Company Limited | Households | 2011 |
| Waterlow Spaces Ltd | Real estate | 2025 |
| Watermill Meadow (Stoke Holy Cross) Management Company Limited | Households | 2017 |
| Watkins & Watkins Limited | Arts & recreation | 2009 |
| Watkins Stewart & Ross Solicitors Limited | Professional & scientific | 2023 |
| Watsnext Consulting Ltd | Professional & scientific | 2025 |
| Watson Domiciliary Limited | Extraterritorial | 1999 |
| Watson Palmer Limited | Professional & scientific | 2011 |
| Watson Palmer Payroll Bureau Ltd | Professional & scientific | 2019 |
| Watson Registrars Limited | Extraterritorial | 1999 |
| Watson Yachts Limited | Professional & scientific | 2026 |
| Watts for Lunch Ltd | Hospitality | 2018 |
| Wavae Ltd | Manufacturing | 2024 |
| Wave and Save Ltd | Wholesale & retail | 2025 |
| Wave One Limited | Information & communication | 2015 |
| Wave Work Surfaces Ltd | Professional & scientific | 2021 |
| Waveney Limited | Wholesale & retail | 1993 |
| Waveney Road (Ipswich) Management Company Limited | Other services | 2006 |
| Wavionex Ltd | Information & communication | 2023 |
| Wawruch Pathology Services Limited | Health & social care | 2019 |
| WAZ Construction Ltd | Construction | 2016 |
| Wazee Ltd | Wholesale & retail | 2025 |
| WB Digital Concept Ltd | Information & communication | 2025 |
| WBJ Asset Management Limited | Manufacturing | 2012 |
| WBW City Holdings Ltd | Financial services | 2018 |
| WCG Health Solutions Ltd | Health & social care | 2019 |
| WDG Holdings Ltd | Real estate | 2023 |
| WE ARE Counter Culture Ltd | Wholesale & retail | 2024 |
| WE ARE Create CIC | Arts & recreation | 2023 |
| WE Build Cheaper Ltd | Construction | 2024 |
| WE Create Hype Limited | Professional & scientific | 2009 |
| WE DO ALL of This Ltd | Information & communication | 2023 |
| WE Global Logistics Ltd | Transport & logistics | 2023 |
| WE Insure Anything Limited | Professional & scientific | 2017 |
| WE Know Social Limited | Professional & scientific | 2025 |
| WE Like to Move IT Ltd | Water & waste | 2025 |
| WE Sync IT Limited | Information & communication | 2025 |
| WE Thrive Digital Ltd | Professional & scientific | 2024 |
| Weal Properties Ltd | Households | 2026 |
| Wealth Centre Limited | Information & communication | 2025 |
| Wealthvista Consultancy Ltd | Extraterritorial | 2026 |
| Weather Estates Limited | Real estate | 2017 |
| Weavers TYE (Long Melford) Management Company Limited | Households | 2018 |
| Weavers Way (Clare) Management Company Limited | Households | 2024 |
| Web & Network Solutions Limited | Information & communication | 2009 |
| Web Design Limited | Information & communication | 2000 |
| Web Happens Ltd | Information & communication | 2015 |
| Webbs Maritime Limited | Manufacturing | 2007 |
| Webena Holdings Limited | Real estate | 2025 |
| Webena Homes Ltd | Construction | 2017 |
| Weblogik Limited | Information & communication | 1999 |
| Webmetrics Limited | Information & communication | 2015 |
| Webongo Limited | Information & communication | 2011 |
| Weboria Ltd | Information & communication | 2026 |
| Wecare UK International Ltd | Health & social care | 2022 |
| Weddell Accounting Limited | Professional & scientific | 2021 |
| Weddingcraft Limited | Manufacturing | 2001 |
| Weee Movers Ltd | Water & waste | 2004 |
| Weefell Resources Limited | Administrative & support | 2012 |
| Welbeck Realty Limited | Real estate | 2016 |
| Welch Refrigeration Services Limited | Manufacturing | 1998 |
| Welgo Holdings Limited | Financial services | 2026 |
| Welleats Box Ltd | Manufacturing | 2025 |
| Wellnesswaves UK Ltd | Extraterritorial | 2026 |
| Wellspring Hart Ltd | Wholesale & retail | 2025 |
| Wellworks Consultancy Ltd | Professional & scientific | 2026 |
| Wenden Scaffolding Ltd | Construction | 2018 |
| Wenham Young Ltd | Manufacturing | 2021 |
| Wericon Holding Ltd | Financial services | 2022 |
| Wescott Building Services Ltd | Administrative & support | 2016 |
| West B High Road Management Limited | Real estate | 2025 |
| West Bay Fishing Ltd | Agriculture & fishing | 2013 |
| West END Leasing Limited | Financial services | 2011 |
| West Engineering and Spiral Tube Limited | Manufacturing | 1997 |
| West Engineering Holdings Limited | Manufacturing | 1991 |
| West Suffolk Chamber of Commerce & Industry Limited | Extraterritorial | 1995 |
| West Tranz Ltd | Transport & logistics | 2012 |
| Westborough Road Ltd | Construction | 2025 |
| Westend Store R Ltd | Wholesale & retail | 2025 |
| Westerfield Construction Ltd | Construction | 2026 |
| Westerfield Consultancy Ltd | Financial services | 2018 |
| Westerfield Consultancy Partnership LLP | | 2019 |
| Westerfield Green Limited | Construction | 2022 |
| Westerfield House Care Ltd | Health & social care | 2015 |
| Westerfield House Holdings Limited | Financial services | 2025 |