| Walkers Travel Ltd | Transport & logistics | 2022 |
| Walston Holdings Limited | Agriculture & fishing | 1953 |
| Walston Poultry Farm Limited | Real estate | 1961 |
| Walton & James Limited | Wholesale & retail | 2019 |
| Ward Goodman Audit Holdings Limited | Professional & scientific | 2019 |
| Ward Goodman Audit Services Limited | Professional & scientific | 2015 |
| Wave Mastering Ltd | Information & communication | 2022 |
| Waveney Flat Management Company Limited | Households | 2001 |
| Weathervanes - Direct Limited | Manufacturing | 2003 |
| Wessex Internet Midco Limited | Financial services | 2023 |
| Wessex Vans Ltd | Wholesale & retail | 2015 |
| West Marketing Communications Ltd | Other services | 2008 |
| Western Design Limited | Professional & scientific | 1986 |
| Westrow Cooper Limited | Professional & scientific | 2013 |
| WH05 MDG Limited | Education | 2025 |
| White Cross Management Company Limited | Households | 2018 |
| Wickham Road RTM Company Limited | Real estate | 2004 |
| Wild Rose Creative Ltd | Arts & recreation | 2024 |
| Wildfire Distribution Ltd | Wholesale & retail | 2016 |
| Willflow Solutions Limited | Professional & scientific | 2025 |
| Williams Homes (Dorset) Ltd | Construction | 2002 |
| Windmill Car Company Ltd | Wholesale & retail | 2006 |
| Windy Apple Ventures Ltd | Financial services | 2019 |
| Wing & Prop Co (UK) Limited | Wholesale & retail | 2025 |
| Wing & Prop Co. Limited | Wholesale & retail | 2025 |
| Winkle Art Limited | Arts & recreation | 2010 |
| Winterborne Financial Services Ltd | Professional & scientific | 2015 |
| Winterborne Management Limited | Households | 1994 |
| Winterborne Real Estate Ltd | Construction | 2025 |
| Wiremore.Co.Uk Limited | Information & communication | 2003 |
| Wise Moves Dance Limited | Professional & scientific | 1997 |
| Withevy Solutions Limited | Professional & scientific | 2017 |
| Woodbury MEP Design Ltd | Construction | 2025 |
| Woodhouse Inns Limited | Hospitality | 1959 |
| Woodworks Carpentry & Joinery Ltd | Manufacturing | 2022 |
| Wunderdog Co Limited | Professional & scientific | 2024 |
| X.L. Kitchens, Bathrooms & Bedrooms Limited | Construction | 2006 |
| Xtra Mile Delivery Ltd | Hospitality | 2024 |
| Your Time Coaching Ltd | Professional & scientific | 2020 |
| Zealot Miniatures Ltd | Manufacturing | 2014 |
| Zimba Properties Ltd | Real estate | 2025 |
| ZS Academy Limited | Administrative & support | 2018 |