| Whitton Holdings Limited | Financial services | 2021 |
| Whitton Park Estates Limited | Professional & scientific | 1928 |
| Whlueiong Limited | Wholesale & retail | 2025 |
| WHM Foods Ltd | Wholesale & retail | 2023 |
| Whur Sports Performance Ltd | Health & social care | 2025 |
| Whybrow Commercial Limited | Real estate | 1987 |
| Whyte Bros Developments Ltd | Real estate | 2024 |
| Whyte Bros Limited | Education | 2023 |
| Wibaloo Ltd | Information & communication | 2026 |
| Wibamu Ltd | Information & communication | 2007 |
| Wick Farm Limited | Agriculture & fishing | 1983 |
| Wick&Flame Ltd | Transport & logistics | 2023 |
| Wicket Limited | Administrative & support | 2021 |
| Wickham Business Enterprises Limited | Arts & recreation | 1979 |
| Wide Skies Ltd | Professional & scientific | 2020 |
| Wigborough Properties Limited | Real estate | 1996 |
| Wiggies Bar-Bers Limited | Other services | 2001 |
| Wiggles and Walks Ltd | Other services | 2025 |
| Wild FOX Enterprises Ltd | Professional & scientific | 2020 |
| Wild FOX Farming Limited | Agriculture & fishing | 2025 |
| Wild Strawberry Cafe Ltd | Hospitality | 2016 |
| Wild Swim Tribe Limited | Wholesale & retail | 2025 |
| Wilden Builders & Construction Limited | Construction | 2024 |
| Wildflower Meadow (Black Notley) Management Company Limited | Households | 2021 |
| Wildlife Art and Design Ltd | Arts & recreation | 1996 |
| Wildwhiskas Co Ltd | Wholesale & retail | 2026 |
| Wilk's Photography Ltd | Information & communication | 2016 |
| Wilkinson Group (Services) Ltd | Administrative & support | 2024 |
| Wilkinson Smith Salon Ltd | Administrative & support | 2003 |
| Wilks Properties Limited | Real estate | 2023 |
| Wilks Property Maintenance Limited | Construction | 2026 |
| Will H Heating Services Ltd | Construction | 2022 |
| Will Hitchcock Consulting Limited | Extraterritorial | 2014 |
| Will Leeks Ltd | Information & communication | 2021 |
| Will O Trees Limited | Extraterritorial | 2013 |
| Will Quince Limited | Professional & scientific | 2024 |
| Will Winwright Design Ltd | Professional & scientific | 2025 |
| Willder Vehicle Solutions Ltd | Administrative & support | 2026 |
| Willder's Retail Limited | Wholesale & retail | 2026 |
| William Maule & Sons,Limited | Real estate | 1939 |
| William Sharman Limited | Arts & recreation | 2009 |
| Williamreece Ltd | Wholesale & retail | 2024 |
| Williams Civils Group Ltd | Construction | 2014 |
| Williams Holloway Associates Ltd | Professional & scientific | 2015 |
| Williams PUB Group Ltd | Hospitality | 2023 |
| Williams Solicitors LLP | | 2013 |
| Williams Syndrome Foundation | Health & social care | 1980 |
| Willis Brickwork Ltd | Construction | 2025 |
| Willis Global Estates Limited | Real estate | 2016 |
| Willis Multi Trades Ltd | Construction | 2026 |
| Willmore Advisors Ltd | Administrative & support | 2026 |
| Willow & Porter Ltd | Other services | 2019 |
| Willow and Pixel Ltd | Information & communication | 2025 |
| Willow Hills Corp Limited | Construction | 2023 |
| Willow Trading Express Limited | Wholesale & retail | 2025 |
| Willow Tree Workshop Ltd | Manufacturing | 2021 |
| WILLOW2BRIDGE Ltd | Real estate | 2023 |
| Willowbeech Ltd. | Health & social care | 2009 |
| Willows Hand Car Wash Ltd | Wholesale & retail | 2022 |
| Willrenton Developments Ltd | Construction | 2025 |
| Wills Tax & Probate Limited | Professional & scientific | 2013 |
| Wills Trusts & Probate Ltd | Professional & scientific | 2023 |
| Wilsam Heating Limited | Construction | 1995 |
| Wilson Autos Ltd | Wholesale & retail | 2024 |
| Wilson FIC Limited | Real estate | 2025 |
| Wilter Limited | Construction | 1987 |
| Wilton Mews (Denton) Management Company Limited | Households | 2007 |
| Wimbledon Limited | Administrative & support | 2021 |
| Wimpole Road Limited | Professional & scientific | 2012 |
| Winburn Villa Limited | Households | 2021 |
| Winch & Blatch Limited | Real estate | 1945 |
| Windhill Capital Limited | Professional & scientific | 2022 |
| Windmill Court (Copford) Management Limited | Households | 1989 |
| Windmill Educational Psychology Services Limited | Professional & scientific | 2016 |
| Windnet Communication Ltd | Professional & scientific | 2018 |
| Window & Door Repair Service Ltd | Other services | 2014 |
| Windows ETC Ltd | Construction | 2006 |
| Wine Well Ltd | Wholesale & retail | 2019 |
| Wine-Boutique Sudbury Limited | Wholesale & retail | 2021 |
| Winefantastic Limited | Wholesale & retail | 2003 |
| Wing IT Media Ltd | Information & communication | 2022 |
| Winged Feet Limited | Administrative & support | 1998 |
| Winglt Limited | Wholesale & retail | 2025 |
| Wingman Solutions Ltd | Professional & scientific | 2025 |
| Wings Magazine Ltd | Information & communication | 2017 |
| Winkles Cottage Ltd | Wholesale & retail | 2025 |
| Winners Media Limited | Professional & scientific | 2012 |
| Winnie’S Walks Ltd | Other services | 2022 |
| Winstree Financial Services Ltd | Financial services | 2018 |
| Winterbourne House Limited | Extraterritorial | 2011 |
| Winthrop Holdings Limited | Real estate | 2020 |
| Winwinproperties Limited | Real estate | 2021 |
| Winwork Solutions Ltd | Construction | 2019 |
| Wiper Mansfield Ltd | Real estate | 2024 |
| Wire Consultancy Ltd | Professional & scientific | 2013 |
| Wireless Broadcast Ltd | Manufacturing | 2007 |
| Wiro Agency Limited | Professional & scientific | 2016 |
| Wisbey & SON Contractors Ltd | Administrative & support | 2022 |
| Wisdom Agriculture Ltd | Professional & scientific | 2022 |
| Wisdoms Trading Ltd | Wholesale & retail | 2025 |