| Watermatic Fire Sprinklers Ltd | Other services | 2017 |
| Waterside Developments (Cheshire) Ltd | Extraterritorial | 2000 |
| Watkinson Properties Limited | Real estate | 2020 |
| Watson Lees Media Limited | Information & communication | 2012 |
| Watson Taylor Holdings Ltd | Financial services | 2024 |
| Watspharm Ltd | Professional & scientific | 2024 |
| Wave Wish Limited | Wholesale & retail | 2025 |
| WAX and Beans Limited | Manufacturing | 2018 |
| Wayne Oliver Plumbing & Heating Ltd | Construction | 2024 |
| Wcde Refurbishment Ltd | Construction | 2021 |
| WDS Group Holdings Limited | Financial services | 2025 |
| WDS Group Limited | Wholesale & retail | 2009 |
| WE ARE Motherzen Ltd | Hospitality | 2024 |
| WE Move Anything Limited | Transport & logistics | 2019 |
| Wealth Accelerator Limited | Information & communication | 2021 |
| Wealthcare Limited | Financial services | 2001 |
| Wealthcare Pensions and Investments Ltd | Financial services | 2014 |
| Wealthguard Limited | Professional & scientific | 2003 |
| Wear ARI Ltd | Wholesale & retail | 2021 |
| Web 3 Resource Ltd | Information & communication | 2010 |
| Web LAB Solutions Ltd | Wholesale & retail | 2019 |
| Webb's Away Cleaning Services Limited | Administrative & support | 2023 |
| Webuyanyinvoice Limited | Professional & scientific | 2011 |
| Weee Schemes Forum Limited | Other services | 2013 |
| Weeshred Ltd | Administrative & support | 2006 |
| Weismuller & Company Limited | Extraterritorial | 1960 |
| Welch Mill Flooring Limited | Financial services | 2018 |
| Welch Mill Holdco Limited | Financial services | 2013 |
| Welcome News Ltd | Wholesale & retail | 2011 |
| Weld Master UK Ltd | Construction | 2025 |
| WELL3 Wellness Limited | Manufacturing | 2026 |
| Wellbank Court Management Limited | Households | 1995 |
| Wellington ST Car Sales Ltd | Wholesale & retail | 2013 |
| Wesharp Ltd | Other services | 2026 |
| Wesley Buildworks Ltd | Construction | 2026 |
| West Care Connect C.I.C. | Health & social care | 2025 |
| West Quay UK Limited | Wholesale & retail | 2008 |
| Westbourne Terrace Leasehold Enfranchisement Limited | Households | 2013 |
| Westbury Auto Centre Limited | Wholesale & retail | 2005 |
| Westbury Flooring Ltd | Construction | 2015 |
| Westbury Structures Limited | Manufacturing | 1992 |
| Westcountry Finance (Cornwall) Limited | Construction | 2005 |
| Westmach Holdings Ltd | Financial services | 2021 |
| Weston Handling Ltd | Professional & scientific | 2019 |
| Westparc Law Limited | Professional & scientific | 2015 |
| Westway Consulting Limited | Extraterritorial | 2021 |
| WH Catering Ltd | Hospitality | 2023 |
| Whalley Range Dent Limited | Health & social care | 2025 |
| Wharfdale Property Consultants Limited | Professional & scientific | 2016 |
| Wharmby Garden Services Limited | Other services | 2014 |
| Wharmby Properties Limited | Real estate | 2025 |
| What a Potato Ltd | Hospitality | 2023 |
| What Tracker Ltd | Wholesale & retail | 2023 |
| Whatever IT Takes Limited | Administrative & support | 2015 |
| Wheeldon Brothers Waste Limited | Water & waste | 1965 |
| Wheeldon Limited | Financial services | 2021 |
| Wheelyfriend Ltd | Professional & scientific | 2025 |
| Whipd Automobilia Ltd | Wholesale & retail | 2024 |
| Whiskygenie.Com Ltd | Wholesale & retail | 2023 |
| Whispering Smith Group Limited | Professional & scientific | 1996 |
| Whispering Smith Holdings Limited | Professional & scientific | 2026 |
| Whispering Smith Limited | Wholesale & retail | 1985 |
| Whispering Smith Properties Limited | Real estate | 2021 |
| Whitaker Smith Recruitment Ltd | Administrative & support | 2025 |
| White and Blue Ventures Limited | Professional & scientific | 2017 |
| White Bear Consultants Limited | Extraterritorial | 2021 |
| White Collar Fighter Ltd | Arts & recreation | 2015 |
| White Collar Fighter Manchester Limited | Health & social care | 2017 |
| White Eagles GEN Trading Ltd | Wholesale & retail | 2021 |
| White Gallery Bridal Ltd | Wholesale & retail | 2014 |
| White Label Holdings Ltd | Financial services | 2020 |
| White Label Property Services Ltd | Real estate | 2020 |
| White Label Retailing Ltd | Wholesale & retail | 2008 |
| White Rose Cars Ltd | Wholesale & retail | 2020 |
| White Valley Psychotherapy Limited | Health & social care | 2026 |
| Whitebirk Developments Limited | Construction | 1998 |
| Whitecliffe Electrical Distribution Ltd | Wholesale & retail | 2019 |
| Whitefield Investment Research Limited | Professional & scientific | 2026 |
| Whitehall Corporate Limited | Financial services | 2011 |
| Whitehall Group (UK) Limited | Financial services | 2011 |
| Whitehall Group Sipp Limited | Financial services | 2021 |
| Whitehall Property Enterprises LLP | | 2014 |
| Whitehall Sipp Trustees Limited | Professional & scientific | 2021 |
| Whitehall Solicitors Limited | Professional & scientific | 2013 |
| Whitehall Trustees Limited | Financial services | 2011 |
| Whitehead Convenience Store Ltd | Wholesale & retail | 2022 |
| Whitehead Engineering Services Limited | Professional & scientific | 2023 |
| Whitehouse Services (NW) Limited | Manufacturing | 2009 |
| Whitemarcstudios Ltd | Arts & recreation | 2025 |
| Whittle Enterprises Ltd | Professional & scientific | 2015 |
| Whittle Hall Ltd | Professional & scientific | 2026 |
| Whitworth Financial Services Limited | Financial services | 2011 |
| Whitworth Holdings Limited | Other services | 2015 |
| Wholesome Junkies Ltd | Hospitality | 2019 |
| Whoweare Limited | Wholesale & retail | 2019 |
| Whyatt Family Investments Limited | Real estate | 2023 |
| Whyprop Limited | Real estate | 2014 |
| Wicked World Limited | Extraterritorial | 2007 |
| Wicklen Holdings Ltd | Real estate | 2021 |
| Wide Band UK Ltd | Information & communication | 2025 |