| Willfire Ltd | Financial services | 2017 |
| Willis Printing and Gifts Ltd | Wholesale & retail | 2025 |
| Willis Printing Limited | Manufacturing | 2024 |
| Willitt & James Limited | Other services | 2015 |
| Willow & Miller Ltd | Wholesale & retail | 2022 |
| Willow Rivers Wealth Ltd | Real estate | 2012 |
| Wiltshire Accident Repair Centre Limited | Extraterritorial | 2004 |
| Wiltshire Accountants Limited | Professional & scientific | 2010 |
| Wiltshire Aggregates Limited | Extraterritorial | 2015 |
| Wiltshire Aircon Ltd | Construction | 2019 |
| Wiltshire and Swindon Sport CIC | Arts & recreation | 2011 |
| Wiltshire Archaeological and Natural History Society | Education | 1999 |
| Wiltshire Ballistic Services Limited | Professional & scientific | 2000 |
| Wiltshire Bricklaying Ltd | Construction | 2020 |
| Wiltshire Builders Ltd | Construction | 2022 |
| Wiltshire Centre for Independent Living Limited | Other services | 2005 |
| Wiltshire County Football Association Limited | Arts & recreation | 1999 |
| Wiltshire Environmental Enterprises Limited | Professional & scientific | 1982 |
| Wiltshire Express Ltd | Wholesale & retail | 2025 |
| Wiltshire Fruit and VEG Ltd | Wholesale & retail | 2015 |
| Wiltshire Handicrafts & Design Limited | Professional & scientific | 2017 |
| Wiltshire Insurance Services Ltd | Financial services | 2011 |
| Wiltshire Martial Arts Limited | Arts & recreation | 2014 |
| Wiltshire Motorhomes Limited | Wholesale & retail | 2018 |
| Wiltshire Plant Sales Ltd | Wholesale & retail | 2025 |
| Wiltshire Recovery Limited | Extraterritorial | 2005 |
| Wiltshire Transport Training & Development Limited | Education | 2003 |
| Wiltshire Waste (Recycling) Limited | Extraterritorial | 2016 |
| Wiltshire Wealth Management Ltd | Administrative & support | 2014 |
| Wiltshire Wildlife Trust Limited | Other services | 1962 |
| Wiltshire Woodburning Company Limited | Other services | 2025 |
| Wiltshires NLP & Counselling Cabin Ltd | Health & social care | 2025 |
| Wine Street Limited | Real estate | 2018 |
| Witchcombe Close Management Company Ltd | Households | 2019 |
| WJH Services Ltd | Health & social care | 2007 |
| Wlkbuilding Ltd | Construction | 2022 |
| Wolfe Academy LLP | | 2023 |
| Women in Security Academy Limited | Other services | 2026 |
| Women's Mckenzie Friend Limited | Professional & scientific | 2020 |
| Wonder Fuel Foods Ltd | Manufacturing | 2023 |
| Wonder Fuel Life Ltd | Wholesale & retail | 2024 |
| Woodland Associates UK Limited | Manufacturing | 2002 |
| Woodpecker Services Limited | Real estate | 1983 |
| Workplace Commercial Estates Ltd | Real estate | 1946 |
| Wyvern Partnership LLP | | 2017 |
| Xplor Aviation Ltd | Transport & logistics | 2026 |
| Yourspace.Place Limited | Education | 2023 |
| Youth Action Wiltshire | Extraterritorial | 1990 |
| Yummy Pacific Limited | Hospitality | 2024 |
| Zebra Property Solutions Ltd | Construction | 2007 |
| Zeezou Ltd | Health & social care | 2024 |
| Zelfi Limited | Transport & logistics | 2005 |