| Wilton Estate Development Limited | Construction | 2003 |
| Wilton Estate Renewables Limited | Energy | 2011 |
| Wilton Fine Art Limited | Wholesale & retail | 2025 |
| Wilton Framers Limited | Manufacturing | 2025 |
| Wilton Hardware Limited | Wholesale & retail | 2022 |
| Wilton Law LLP | | 2013 |
| Wilton Nails and Beauty Ltd | Other services | 2025 |
| Wilton Property Management Limited | Real estate | 1996 |
| Wilton Riding for the Disabled Association | Health & social care | 2014 |
| Wilts and Hants Power Drives and Landscaping Ltd | Construction | 2025 |
| Wilts and Hants Tree Care Ltd | Agriculture & fishing | 2022 |
| Wilts Technology Limited | Information & communication | 2018 |
| Wiltshire Care Partnership | Public administration | 2013 |
| Wiltshire Countryside Services Ltd | Agriculture & fishing | 2025 |
| Wiltshire Creative | Arts & recreation | 1951 |
| Wiltshire Gallery Limited | Wholesale & retail | 2013 |
| Wiltshire Glass & Windows Ltd. | Manufacturing | 1999 |
| Wiltshire Group Holdings Limited | Extraterritorial | 2015 |
| Wiltshire Inns Ltd | Hospitality | 2020 |
| Wiltshire Makers CIC | Wholesale & retail | 2020 |
| Wiltshire Prize Money Ltd | Administrative & support | 2026 |
| Wiltshire Produce Limited | Hospitality | 2026 |
| Wiltshire Taxis Ltd | Transport & logistics | 2026 |
| Wiltshire Trade Storage Limited | Transport & logistics | 2010 |
| Wiltshire Wood Flooring Supplies Ltd | Wholesale & retail | 2015 |
| Winchester Fine Gardens Ltd | Administrative & support | 2022 |
| Winchester Fish Ltd | Hospitality | 2025 |
| Winchester Park Properties Limited | Real estate | 2003 |
| Winchester Street (Salisbury) Management Company Limited | Administrative & support | 2013 |
| Wind in the Willows Pre-School Limited | Education | 2010 |
| Wind Power Aviation Consultants Limited | Professional & scientific | 2009 |
| Windgreen Gardens Management Company Limited | Households | 2020 |
| Windmill Views Management Company (Barnham) Limited | Real estate | 2021 |
| Winker Green Mills Management Company Limited | Households | 2007 |
| Winning Moments Limited | Other services | 2014 |
| Winser Ballet Limited | Arts & recreation | 2023 |
| Winterbourne FOX Cubs Ltd | Health & social care | 2021 |
| Winterbourne Trustee Services Limited | Administrative & support | 1996 |
| Winterbury Training Ltd | Education | 2023 |
| Winters Rise Management Company Limited | Households | 2022 |
| Winterslow Coachworks Limited | Wholesale & retail | 2003 |
| Winterslow Property Holdings Ltd | Households | 2025 |
| Winterslow Wasps Limited | Manufacturing | 2005 |
| Wiresight Ltd | Information & communication | 2026 |
| Wish Property Ltd | Real estate | 2019 |
| Wishford Health Limited | Health & social care | 2023 |
| Wishford Reach Limited | Households | 2009 |
| Wistbray Limited | Extraterritorial | 1976 |
| Wisteria Gate (Romsey) Management Company Ltd | Households | 2022 |
| Wisteria Manor Limited | Professional & scientific | 2015 |
| Wisub Limited | Real estate | 2024 |
| Witan Studios Limited | Real estate | 2024 |
| Witham Capital Limited | Financial services | 2012 |
| Withyslade Equine Ltd | Wholesale & retail | 2014 |
| WJ & ME Haulage Limited | Transport & logistics | 2001 |
| Wjne Developments Limited | Real estate | 2021 |
| WL Business Enterprises Ltd | Construction | 2014 |
| WL Retail Ltd | Hospitality | 2021 |
| Wmev Limited | Information & communication | 2026 |
| WNC Events Ltd | Administrative & support | 2021 |
| WOK 4 Go Lansdowne Ltd | Hospitality | 2023 |
| WOK With U 88 Limited | Hospitality | 2021 |
| Wolf and Hound Ltd | Information & communication | 2022 |
| Wolferstan Management Company Limited | Households | 1988 |
| Wolff Investments Limited | Construction | 2026 |
| Wolfstone Technology Limited | Manufacturing | 2010 |
| Wolvercote Mill Management Company Limited | Households | 2018 |
| Wonder Audio Limited | Information & communication | 2019 |
| Wong's Chinese Take Away Ltd | Hospitality | 2020 |
| Wong's Dinner Limited | Hospitality | 2025 |
| Wooburn Project Management Limited | Construction | 2015 |
| Woodbridge House Management Company Limited | Households | 2013 |
| Woodbury Property Management Ltd | Real estate | 2022 |
| Woodcote Classic Cars Limited | Wholesale & retail | 2019 |
| Woodford Forest & Landscape Limited | Agriculture & fishing | 1993 |
| Woodford Forest Holdings Ltd | Financial services | 2024 |
| Woodford Woodpeckers Limited | Health & social care | 2019 |
| Woodhenge Property Limited | Real estate | 2017 |
| Woodland Burials Cholderton Limited | Other services | 2000 |
| Woodland Kitchen and Bedroom Limited | Manufacturing | 2023 |
| Woodland Rise (Totton) Management Company Limited | Households | 2012 |
| Woodland View (Kings Warren) Management Company Ltd | Households | 2006 |
| Woodlands Equine Services Limited | Agriculture & fishing | 2026 |
| Woodley Brothers Electric Vehicle Charging UK Ltd | Construction | 2020 |
| Woodside Finance Ltd | Professional & scientific | 2017 |
| Woodstock House Limited | Health & social care | 2015 |
| Wool Gardens (Crewkerne) Management Company Limited | Households | 2022 |
| Woolfall Properties Limited | Real estate | 2024 |
| Woolley & Wallis Finance Limited | Financial services | 2013 |
| Woolley & Wallis LLP | | 2022 |
| Woolstreet Property Investments Limited | Real estate | 2020 |
| Wootton Vale Management Company Limited | Households | 2009 |
| Woottonbrook Management Company Limited | Households | 2021 |
| Wordsmith Marketing Limited | Professional & scientific | 2017 |
| Work Wise Adhd Limited | Education | 2025 |
| Workwear Innovation Ltd | Manufacturing | 2020 |
| World Picture Ventures Limited | Information & communication | 2010 |
| Worm&Bird Ltd | Professional & scientific | 2019 |
| WOW World Group Digital Limited | Information & communication | 2020 |
| WOW World Group Holdings Limited | Financial services | 2020 |