| WC Roofing Contractors Ltd | Construction | 2024 |
| WCB Contractors Ltd | Construction | 2017 |
| WD Fire Services Ltd | Manufacturing | 2019 |
| WE ARE Accountables Holding Ltd | Professional & scientific | 2023 |
| WE ARE Grape Ltd | Information & communication | 2011 |
| WE Cleaning Ltd | Administrative & support | 2025 |
| WE Fill OUT ANY Form Ltd | Professional & scientific | 2026 |
| WE Supply Meat Ltd | Hospitality | 2018 |
| WE Window Clean Ltd | Administrative & support | 2026 |
| Weald Way Limited | Real estate | 2017 |
| Wealth Management Accountanting Services Ltd | Professional & scientific | 2019 |
| Wealth Partners Resources Limited | Construction | 2016 |
| Wealthvisor Capital Ltd | Professional & scientific | 2024 |
| Wealthy Foods Limited | Wholesale & retail | 2025 |
| Wearareyou Limited | Manufacturing | 2019 |
| Weaver Development Group Limited | Professional & scientific | 2025 |
| Web.Dezine Limited | Administrative & support | 1971 |
| WEB3 Creative Services Limited | Professional & scientific | 2023 |
| Webb Capital Leasing Limited | Financial services | 1999 |
| Webisu Ltd | Wholesale & retail | 2021 |
| Weblink Marketing Ltd | Professional & scientific | 2022 |
| Webnetsolutions Ltd | Information & communication | 2023 |
| Webnise Ltd | Wholesale & retail | 2018 |
| Websters Warehouse Ltd | Wholesale & retail | 2025 |
| Webxsolution Limited | Information & communication | 2004 |
| Weird Creative by JK Ltd | Arts & recreation | 2026 |
| Weiser Developments Limited | Construction | 2012 |
| Weiser Investments Limited | Real estate | 2017 |
| Weiser Taverns Beers & Minerals Ltd | Wholesale & retail | 2006 |
| Wellcare Solutions Limited | Administrative & support | 2023 |
| Wellesley Plumbing Ltd | Construction | 2025 |
| Wellfy Ltd | Information & communication | 2026 |
| Wellies London Ltd | Manufacturing | 2025 |
| Wellmens Assets Ltd | Financial services | 2025 |
| Wellmens Construction Ltd | Construction | 2025 |
| Wellmens Holdings Ltd | Financial services | 2025 |
| Wellmens Limited | Financial services | 2025 |
| Wellmens MEP Ltd | Construction | 2025 |
| Wellnest Solutions Ltd | Health & social care | 2024 |
| Wellsrise Health Limited | Health & social care | 2015 |
| Wellsrise HEALTH-2 Ltd | Public administration | 2022 |
| Wengle Building Services Ltd | Construction | 2025 |
| Wenlocks Farming Limited | Agriculture & fishing | 2018 |
| Wenman Park Homes Limited | Real estate | 2017 |
| Wennington Property Development Limited | Construction | 2009 |
| Wereheretocare Ltd | Health & social care | 2025 |
| Werm Limited | Extraterritorial | 2016 |
| Wescon Lanka (UK) Ltd | Transport & logistics | 2026 |
| Weserve UK Limited | Administrative & support | 2026 |
| West Avenue Limited | Arts & recreation | 2014 |
| West Court Finchley Limited | Real estate | 2012 |
| West Essex Flooring Limited | Households | 2013 |
| West Essex Will Services Ltd | Professional & scientific | 2018 |
| West Thurrock Coachworks Limited | Wholesale & retail | 1977 |
| Westbrook Solutions Limited | Wholesale & retail | 2024 |
| Westbury Group of Companies Limited | Financial services | 2020 |
| Westbury International Investments Ltd | Real estate | 2016 |
| Westcolt SM Limited | Professional & scientific | 2019 |
| Westeden Ltd | Real estate | 2021 |
| Western Point Limited | Real estate | 2025 |
| Western Road Dental Practice Ltd | Health & social care | 2015 |
| Western Sale Online Ltd | Wholesale & retail | 2018 |
| Western Spice Limited | Hospitality | 2024 |
| Westferry Road Management Company Limited | Real estate | 1986 |
| Westhen Properties Ltd | Real estate | 2024 |
| Weston Care Services Limited | Transport & logistics | 2009 |
| Westwood Lodge Ltd | Health & social care | 2015 |
| WEZ & Co Accountants Limited | Professional & scientific | 2022 |
| Wfdcl Sweets Limited | Wholesale & retail | 2024 |
| WGB Drafting Limited | Professional & scientific | 2010 |
| Wguru Properties Ltd | Real estate | 2025 |
| Whalebone Fastfood Ltd | Hospitality | 2020 |
| Whalebone Property Limited | Households | 1982 |
| Wharf Property Management Ltd | Households | 2024 |
| Wharf Road RTM Company Ltd | Real estate | 2015 |
| What a Life! Creative Ltd | Information & communication | 2026 |
| What Funnel Limited | Information & communication | 2025 |
| What's That Sound Productions Ltd | Information & communication | 2022 |
| Whatling Group Ltd | Construction | 2024 |
| Wheels on Wash Ltd. | Wholesale & retail | 2025 |
| Whenuakite Limited | Health & social care | 2019 |
| Where to Look Communications Limited | Professional & scientific | 2018 |
| Whetton Ltd | Professional & scientific | 2011 |
| Whiscim Flat Management Company Limited | Households | 1978 |
| Whitberry Ltd | Construction | 2013 |
| Whitchurch Grocery and Confectionery Store Ltd | Wholesale & retail | 2016 |
| Whitchurch Offy Ltd | Wholesale & retail | 2021 |
| White & Red Group Ltd | Real estate | 2019 |
| White and Flowers Ltd | Wholesale & retail | 2022 |
| White Cliff Marketing Solutions Ltd | Other services | 2024 |
| White Forge Ltd | Information & communication | 2025 |
| White Hart Lane Fish Bar Limited | Hospitality | 2022 |
| White Hart Lane Offy Ltd | Wholesale & retail | 2026 |
| White Intelligence Ltd | Information & communication | 2018 |
| White Law Ltd | Professional & scientific | 2015 |
| White Oak Care Limited | Health & social care | 2019 |
| White Oak Technologies Ltd | Information & communication | 2023 |
| White Tower Management Limited | Hospitality | 2019 |
| Whitebarn Management Co. Limited | Households | 1971 |
| Whitebay Properties Limited | Real estate | 2005 |