| Warner Mccall Ltd | Administrative & support | 2009 |
| Watchman Accountants Limited | Professional & scientific | 2021 |
| Watermoor Meat Supply Limited | Wholesale & retail | 1952 |
| Waters Property Search Limited | Real estate | 2015 |
| Wattcrop Ltd | Energy | 2013 |
| WBP Bris LLP | | 2024 |
| WDC (Trading) Limited | Wholesale & retail | 1991 |
| WE ARE Brave Ltd | Professional & scientific | 2016 |
| WE Meat Again Ltd | Hospitality | 2020 |
| Wealthlink Recruitment Ltd | Administrative & support | 2024 |
| Weanswer Group Limited | Information & communication | 2019 |
| Webb Farming Ltd | Agriculture & fishing | 2024 |
| Webber's Nook Publishing Limited | Information & communication | 2023 |
| Webbley Ltd | Agriculture & fishing | 2012 |
| WEC Property Ltd | Real estate | 2018 |
| Wedventure Limited | Wholesale & retail | 2023 |
| WEH Properties Limited | Real estate | 2026 |
| Wells Building Preservation Trust | Arts & recreation | 2001 |
| Wendy LAU Ltd | Health & social care | 2019 |
| Wessex Aerial Imaging and Data Ltd | Information & communication | 2026 |
| Wessex Agronomy Services Ltd | Professional & scientific | 2005 |
| Wessex Auction Rooms Limited | Administrative & support | 2007 |
| Wessex Consulting Limited | Professional & scientific | 2022 |
| Wessex Inspirational Learning Limited | Education | 2024 |
| Wessex Parcel Delivery Ltd | Transport & logistics | 2020 |
| Wessex PD Limited | Transport & logistics | 2025 |
| Wessex Skin Ltd | Health & social care | 2015 |
| West Brinkworth Service Ltd | Administrative & support | 2015 |
| West House Bathampton Management Company Limited | Administrative & support | 1983 |
| West Kington Nurseries Limited | Agriculture & fishing | 2005 |
| West Kington Stud Limited | Agriculture & fishing | 2018 |
| West Somerset Lagoon Ltd | Professional & scientific | 2018 |
| Western Property Management Limited | Real estate | 2019 |
| Westfarthing Property Limited | Real estate | 2022 |
| Weston Decorating Limited | Construction | 2008 |
| Weston Lodge Shooting Ground & Madtrax (Bristol) Ltd | Arts & recreation | 2003 |
| Westonbirt Woodworks Ltd | Manufacturing | 2015 |
| Westrop Ltd | Professional & scientific | 2011 |
| Westrose Holdings Ltd | Financial services | 2024 |
| WFH Francis & SON Dairy Ltd | Agriculture & fishing | 2012 |
| WFL (UK) Limited | Wholesale & retail | 1957 |
| WG Court Limited | Households | 2003 |
| Whalex Engineering Limited | Professional & scientific | 2023 |
| Wheelers Hill Limited | Professional & scientific | 1999 |
| Wheeliebins Cleaning UK Limited | Administrative & support | 2009 |
| Whiston Builders Limited | Construction | 2009 |
| White & Speirs Brickwork Limited | Construction | 2017 |
| White Avon Limited | Professional & scientific | 2018 |
| White Emulsion Limited | Real estate | 2024 |
| White Heat Restaurants Limited | Hospitality | 2007 |
| White Horse Motorcycles Ltd | Wholesale & retail | 2020 |
| White Mortgage Services Limited | Financial services | 2024 |
| White Rose Hospitality Ltd | Hospitality | 2021 |
| White Space Management Consultancy Limited | Professional & scientific | 2018 |
| Whitehall Farm (Wessex) Ltd | Agriculture & fishing | 2024 |
| Whitehall Garden Centre (Holdings) Limited | Professional & scientific | 2010 |
| Whitehall Group (Wessex) Limited | Professional & scientific | 1986 |
| Whitehall Self Storage Ltd | Real estate | 2025 |
| Whitehorse Roofing & SON Ltd | Construction | 2024 |
| Whitworth Finance Ltd | Financial services | 2020 |
| WHO LET the Docs OUT CIC | Information & communication | 2026 |
| Wickham & MAY Limited | Construction | 2003 |
| Wild Swim Bike Run Limited | Wholesale & retail | 2017 |
| Wilde Wycher Broc Ltd | Agriculture & fishing | 2022 |
| Wilding Engineering Services Limited | Manufacturing | 1985 |
| Wilkey Garden Machinery Services Limited | Manufacturing | 2002 |
| Wilkins Plant & Machinery Limited | Manufacturing | 2007 |
| William Dixon & Associates Ltd | Financial services | 2010 |
| William Tucker Carpentry Ltd | Construction | 2023 |
| Williams & White Removals Ltd. | Transport & logistics | 2018 |
| Willis Gardens Management Company Ltd | Households | 2018 |
| Willo's Fencing Supplies Ltd | Wholesale & retail | 2011 |
| Willow Coaching Ltd | Education | 2021 |
| Willow Homebuilders Limited | Construction | 2004 |
| Willow UK Limited | Wholesale & retail | 2003 |
| Willowbach Limited | Agriculture & fishing | 2015 |
| Willows Fishery Limited | Agriculture & fishing | 2019 |
| Willows Retreats Limited | Hospitality | 2021 |
| Wilson Baird Holdings Ltd | Financial services | 2022 |
| Wilts & Berks Canal Trust | Other services | 1988 |
| Wilts Damp Proofing Limited | Construction | 2014 |
| Wilts Services Ltd | Professional & scientific | 2013 |
| Wiltshire & Cotswolds Limited | Construction | 2018 |
| Wiltshire Aesthetics Ltd | Other services | 2025 |
| Wiltshire Air Conditioning Services Ltd | Energy | 2017 |
| Wiltshire BEE Centre Limited | Agriculture & fishing | 2017 |
| Wiltshire Boxing Shop Ltd | Wholesale & retail | 2026 |
| Wiltshire Ceramic Studio Ltd | Manufacturing | 2021 |
| Wiltshire Cleaning Solutions Ltd | Administrative & support | 2024 |
| Wiltshire CNC Ltd | Extraterritorial | 2023 |
| Wiltshire Commercials Limited | Wholesale & retail | 2006 |
| Wiltshire County Contractors Limited | Administrative & support | 2012 |
| Wiltshire Cricket Limited | Arts & recreation | 2010 |
| Wiltshire Driveway Company Ltd | Construction | 2024 |
| Wiltshire Flooring Storage Ltd | Real estate | 2024 |
| Wiltshire Handmade Kitchens Ltd | Manufacturing | 2025 |
| Wiltshire Historic Buildings Trust Limited (the) | Real estate | 1967 |
| Wiltshire Kitchens and Bathrooms Ltd | Construction | 2019 |
| Wiltshire Motor Company Limited | Financial services | 2023 |
| Wiltshire Real Estate Ltd | Real estate | 2020 |