| Wessex Fixings Limited | Construction | 2012 |
| Wessex Flooring Limited | Construction | 2016 |
| Wessex Heritage & Remedial Limited | Administrative & support | 2009 |
| Wessex International Machinery | Wholesale & retail | 2003 |
| Wessex Racking Services Limited | Extraterritorial | 2025 |
| Wessex Tubas Ltd | Wholesale & retail | 2007 |
| Westwood Estates Ltd | Real estate | 2020 |
| Wet-Wired.Com Ltd | Information & communication | 2000 |
| Wevp Limited | Professional & scientific | 2012 |
| Weyhill Farm Shop Limited | Wholesale & retail | 2015 |
| Weyhill Limited | | 1982 |
| Weystone Financial Ltd | Financial services | 2017 |
| Wheathall Transport Ltd | Transport & logistics | 2014 |
| Wherwell Farms Limited | Agriculture & fishing | 1973 |
| Wherwell Priory Enterprises Limited | Real estate | 2022 |
| White & SON Technologies Ltd | Manufacturing | 2022 |
| White Horse Thruxton Ltd | Hospitality | 2024 |
| Whitestone Recruitment Ltd | Administrative & support | 2025 |
| Whitewick Studios Ltd | Information & communication | 2025 |
| Whitway (Holdings) Limited | Financial services | 2004 |
| Wild Fish Conservation | Other services | 2004 |
| Wildgoose Projects Limited | Information & communication | 1996 |
| Wilkins Carpet and Flooring Limited | Construction | 2023 |
| Will Bremridge Limited | Other services | 2016 |
| Willax Capital Ltd | Financial services | 2022 |
| William James Boughey Ltd | Real estate | 2021 |
| Willmont Building Management Ltd | Construction | 2019 |
| Willmont Building Services Limited | Construction | 2012 |
| Willow & Co Stockbridge Limited | Professional & scientific | 2023 |
| Willow & Rose Hair Studio Ltd Ltd | Other services | 2026 |
| Willow Springs Properties Limited | Real estate | 2025 |
| Willowbank (Ludgershall) Management Company Limited | Households | 1995 |
| Wimpole House Residents Association Limited | Administrative & support | 2002 |
| Winchcombe Developments Ltd | Real estate | 2020 |
| Winchester White Limited | Other services | 2011 |
| Windmill Interim Leadership for Learning Ltd | Education | 2020 |
| Windmill Lane (Anna Valley) Management Company Limited | Professional & scientific | 2001 |
| Windrush Technologies Ltd | Information & communication | 2025 |
| Windsor Coachworks Ltd | Manufacturing | 2021 |
| Wineworth Limited | Agriculture & fishing | 2025 |
| Winning Ticket Limited | Arts & recreation | 2018 |
| Winterbourne Estates Limited | Real estate | 2015 |
| Wintermoore Associates Ltd | Professional & scientific | 2012 |
| Winton Stores Limited | Wholesale & retail | 2022 |
| WIRED4INNOVATION Ltd | Professional & scientific | 2015 |
| Wiser Academy Limited | Wholesale & retail | 2007 |
| Witchery Studios Ltd | Information & communication | 2019 |
| With YOU Care Ltd | Administrative & support | 2023 |
| WJ Home Services Ltd | Construction | 2013 |
| WLL Global Limited | Wholesale & retail | 2024 |
| WM Plant Limited | Water & waste | 2020 |
| Wolf Bear Ltd | Professional & scientific | 2025 |
| Wolf Telecommunications Ltd | Information & communication | 2017 |
| Woodstock Furniture Design Limited | Wholesale & retail | 2012 |
| Woodstock Furniture Limited | Construction | 2004 |
| Woodstock Plumbing & Heating Supplies Limited | Wholesale & retail | 2005 |
| Woodys Andover Ltd | Hospitality | 2025 |
| Woolger Consulting Ltd | Administrative & support | 2016 |
| Workhat Services Ltd | Administrative & support | 2026 |
| Woto Ltd | Information & communication | 2022 |
| Wowo Limited | Transport & logistics | 2017 |
| Wren Laboratories Limited | Manufacturing | 2004 |
| Wright Joinery and Interiors Ltd | Construction | 2018 |
| WT Industrial Roofing,Cladding & Maintenance Ltd | Construction | 2023 |
| Wyke Down Free House Limited | Hospitality | 2019 |
| Wykeham ROW Residents Association Limited | Real estate | 1967 |
| XEN and RAY Ltd | Other services | 2017 |
| Xentra Ltd | Administrative & support | 2022 |
| Xinglong Property Ltd | Real estate | 2023 |
| XMG Holdings Ltd | Real estate | 2021 |
| Xmplify Consulting Ltd | Professional & scientific | 2020 |
| XR Estates Ltd | Real estate | 2024 |
| Yamabuki Tattoo Ltd | Administrative & support | 2024 |
| Yambulca Ltd | Hospitality | 2025 |
| Yellow Brick Road Projects | Education | 2014 |
| Yellow Tuxedo Ltd | Information & communication | 2017 |
| Yelspa Limited | Energy | 1977 |
| Ymyb Health Ltd | Health & social care | 2019 |
| York Mansions (Baker Street) Limited | Households | 1995 |
| Yorke & Co LLP | | 2012 |
| Young Architects Limited | Professional & scientific | 2014 |
| Young Pilots International Limited | Education | 2025 |
| Young Pilots International Online Limited | Education | 2025 |
| Your Brand Advocate Ltd | Professional & scientific | 2018 |
| Yourcare Support Ltd | Public administration | 2021 |
| Yourport.Net Limited | Information & communication | 2003 |
| Ythsg Property Holdings Ltd | Real estate | 2024 |
| YYY Play Limited | Health & social care | 2025 |
| Z.Samad Limited | Other services | 2019 |
| Zafes Ltd | Wholesale & retail | 2024 |
| Zanalytics Limited | Professional & scientific | 2023 |
| Zandor Records Ltd | Manufacturing | 2020 |
| Zdzich Ltd | Transport & logistics | 2010 |
| ZEN Forge Ltd | Manufacturing | 2023 |
| Zena Property Management Ltd | Real estate | 2019 |
| ZF Studio Ltd | Other services | 2021 |
| Zhurongou Limited | Wholesale & retail | 2026 |
| ZIP Property Developers Limited | Real estate | 2023 |
| Zirco Limited | Wholesale & retail | 2015 |
| Ziver Beauty and Wellness Limited | Wholesale & retail | 2026 |