| Wessex Money Limited | Professional & scientific | 2014 |
| Wessex Utilities Limited | Construction | 2012 |
| West Hampshire Mineral Company Ltd | Professional & scientific | 2021 |
| West Peak Partners Ltd | Professional & scientific | 2021 |
| Westbrook Owners Limited | Households | 2005 |
| Westcliff Hall (Sidmouth) Limited | Hospitality | 1946 |
| Westec Engineering Ltd | Professional & scientific | 2011 |
| What YOU Need to Know Ltd | Information & communication | 2015 |
| Whisperwood Ltd | Hospitality | 2025 |
| White House Education Limited | Extraterritorial | 2002 |
| White House Guardianship Limited | Extraterritorial | 2002 |
| White Truffle Events Limited | Hospitality | 2015 |
| Whitefield Lodge Flat Management Limited | Real estate | 1988 |
| Whitefield Lodge Freehold Limited | Households | 2015 |
| Whitehall Tasty Kitchens Ltd | Construction | 2025 |
| Wholistic Roots Ltd | Wholesale & retail | 2024 |
| Wick Lane PP Limited | Real estate | 2024 |
| Wick Safety Limited | Construction | 2018 |
| Wilcoe Scaffolding Ltd | Construction | 2022 |
| Wild and Free Therapy CIC | Health & social care | 2022 |
| Wild Dog Games | Information & communication | 2021 |
| Wild Hurricane Limited | Professional & scientific | 2023 |
| Wild One Ltd | Wholesale & retail | 2024 |
| Wild Wiltshire Group Ltd | Manufacturing | 2026 |
| Will Finch Design Ltd | Professional & scientific | 2021 |
| Will Girling Performance Nutrition Limited | Health & social care | 2014 |
| William Lack Marine Limited | Wholesale & retail | 2015 |
| Willin Limited | Real estate | 2001 |
| Willow Hamlet Management Limited | Real estate | 2009 |
| Willow Place (Christchurch) Limited | Extraterritorial | 2012 |
| Willow Tree Layne Ltd | Wholesale & retail | 2020 |
| Willow Way Marina Limited | Administrative & support | 2008 |
| Wills Textiles Limited | Professional & scientific | 2013 |
| Wilsons Hampshire Ltd | Agriculture & fishing | 2018 |
| WIN at Retail Limited | Wholesale & retail | 2014 |
| Winchester Marine and Industrial Limited | Real estate | 2013 |
| Wings N Tings Ltd | Hospitality | 2020 |
| Winkton House Management Company Limited | Households | 1973 |
| Winton Chicken Limited | Hospitality | 2017 |
| Winton Pre-School Little Explorers Ltd | Education | 2023 |
| Wise Mind Clinic Ltd | Health & social care | 2026 |
| Wisteria Property Projects Limited | Real estate | 2023 |
| Woodchester Investments Ltd. | Financial services | 2023 |
| Woodram Property Ltd | Real estate | 2018 |
| Woodside (Highcliffe) Limited | Households | 1972 |
| Worksmart Roofing and Building Ltd | Construction | 2022 |
| Worlds Biggest Inflatable Castle Limited | Arts & recreation | 2024 |
| Worthtech IT Solutions Limited | Information & communication | 2008 |
| WOW Finance Limited | Information & communication | 2020 |
| WPJ Developments Limited | Real estate | 2024 |
| WPM Lettings (Purbeck) Limited | Real estate | 2011 |
| WRB Homes Ltd | Construction | 2016 |
| Wright Precision Ltd | Arts & recreation | 2021 |
| WRZ Blade Repair Ltd | Manufacturing | 2026 |
| WS Fire Services Limited | Construction | 2019 |
| Wysper Labs Ltd | Administrative & support | 2026 |
| X-Net (Engineering) Ltd | Information & communication | 2023 |
| X-Net (Services) Ltd | Information & communication | 1996 |
| XC Design Ltd | Professional & scientific | 2018 |
| Xchurch Digital Print Limited | Manufacturing | 2002 |
| Xigo Ltd | Professional & scientific | 2007 |
| Yacht Accounts Limited | Professional & scientific | 2010 |
| Yanni Barber Ltd | Other services | 2024 |
| YBE Travels Ltd | Administrative & support | 2025 |
| Yonder Real-Estate Ltd | Real estate | 2022 |
| Yotbox Limited | Professional & scientific | 2017 |
| Young Gardens Limited | Administrative & support | 2002 |
| Your Person Ltd | Information & communication | 2025 |
| Your Personal France Ltd | Hospitality | 2003 |
| Youth Work (UK) Limited | Education | 1990 |
| Yttrium Consulting Limited | Professional & scientific | 2022 |
| Yule Medical Limited | Health & social care | 2020 |
| Zanna Events Limited | Administrative & support | 2010 |
| Zanzero Investments Ltd | Wholesale & retail | 2024 |
| Zapatero Ltd | Wholesale & retail | 2019 |
| Zebra Recruitment Limited | Administrative & support | 2008 |
| Zennex Special Products Limited | Manufacturing | 2014 |
| Zentera Wool Company Limited | | 2023 |
| Zentrix Distribution Ltd | Wholesale & retail | 2026 |
| Zero-Moo Ltd | Manufacturing | 2019 |
| Zilic Ltd | Professional & scientific | 2021 |
| Zixx Ltd | Administrative & support | 2019 |
| Zorin Homes (Wimborne) Limited | Construction | 2018 |
| Zorin Homes Limited | Real estate | 2016 |
| Zorixa PVT Limited | Wholesale & retail | 2025 |