| Walker-Blair Building Limited | Construction | 2019 |
| Wallace Harris Limited | Professional & scientific | 1965 |
| Wallop Enterprise Company Limited | Real estate | 2021 |
| Walls Estate Agents Limited | Real estate | 2023 |
| Walnut Hill Equine Clinic Ltd | Professional & scientific | 2016 |
| Walrow Tyre Services Limited | Wholesale & retail | 1984 |
| Walson Holdings Limited | Financial services | 2022 |
| Walter's Lincoln Ltd | Real estate | 2018 |
| Walton Consultants Limited | Professional & scientific | 2007 |
| Ward Business Development Ltd | Wholesale & retail | 2022 |
| Wardmay Limited | Wholesale & retail | 2002 |
| Ware and Company Limited | Real estate | 2012 |
| Ware Construction South West Limited | Construction | 2011 |
| Ware Developments Limited | Construction | 2016 |
| Warm Welcome South West Limited | Transport & logistics | 2005 |
| Warren Court (Ilminster) RTM Company Limited | Households | 2017 |
| Warren Property Limited | Real estate | 2020 |
| Warrenco Ltd | Financial services | 2024 |
| Wasabi&Ginger Limited | Hospitality | 2023 |
| Wasted (SW) Limited | Extraterritorial | 2025 |
| Watch IT Games Ltd | Wholesale & retail | 2022 |
| Water Lane Retirement Properties (UK) Limited | Real estate | 2025 |
| Water Supply Services (UK) Ltd | Water & waste | 2022 |
| Waterbridge Golf Course Ltd | Arts & recreation | 2003 |
| Watercourse Systems Limited | Construction | 1999 |
| Waterfront Artworks Ltd | Wholesale & retail | 2025 |
| Waterhayne Farms Ltd | Agriculture & fishing | 2025 |
| Waterleigh Limited | Construction | 2020 |
| Waters Edge (Taunton) RTM Company Limited | Households | 2023 |
| Watersedge Blue Limited | Health & social care | 2010 |
| Watershed Investments Limited | Financial services | 2024 |
| Watersplash Leisure Holdings Limited | Financial services | 2019 |
| Watersplash Leisure Limited | Real estate | 1957 |
| Waterway Drainage Engineering Ltd | Professional & scientific | 2024 |
| Watling Street Advisors LLP | | 2014 |
| Watney Combe & Reid Limited | Hospitality | 2024 |
| Watt to Wear Limited | Manufacturing | 1989 |
| Wattam Farms Limited | Agriculture & fishing | 2004 |
| Waugh Properties Ltd | Real estate | 2023 |
| Way Ahead Community Services Ltd | Health & social care | 1995 |
| Way Ahead Holdings Limited | Financial services | 2017 |
| Wayne FIX Ltd | Construction | 2025 |
| WB Commerce Ltd | Wholesale & retail | 2023 |
| WB Honey Ltd | Agriculture & fishing | 2023 |
| Wbesley Ltd | Financial services | 2023 |
| WCG Sporting Limited | Wholesale & retail | 2014 |
| WCI Group Limited | Construction | 2007 |
| WCL Prudent Limited | Financial services | 2020 |
| WD Farmers Limited | Other services | 2010 |
| WE ARE Zeelee Limited | Administrative & support | 2020 |
| WE Care Group Limited | Health & social care | 2015 |
| WE Create Property Limited | Construction | 2023 |
| WE Create Residential Ltd | Construction | 2023 |
| Weare House Freehold Company Ltd | Households | 2020 |
| Weare House Leasehold Management Company Limited | Households | 2019 |
| Wearetrailblazer Ltd | Professional & scientific | 2024 |
| Weathernet Limited | Professional & scientific | 1995 |
| Weave Associates Ltd | Professional & scientific | 2023 |
| Weavo (Fencing) Products Limited | Manufacturing | 1980 |
| Webbers Wessex Limited | Wholesale & retail | 2012 |
| Webreach Ltd | Wholesale & retail | 2026 |
| Webtelecom Limited | Information & communication | 2010 |
| Weck Ltd | Financial services | 2025 |
| Wedmore Grange (Wedmore) Management Company Limited | Households | 2019 |
| Weekender Events Group Ltd | Arts & recreation | 2019 |
| Welch & Co (South West) Limited | Professional & scientific | 2012 |
| Welch & Co Holdings Ltd | Financial services | 2025 |
| Welch Company Services Limited | Professional & scientific | 2012 |
| Well Vetted Ltd | Financial services | 2026 |
| Welland Vets Ltd | Professional & scientific | 2025 |
| Wellesley Court Management (Taunton) Limited | Households | 1971 |
| Wellington Community Support Services Limited | Other services | 2012 |
| Wellington Glass Limited | Wholesale & retail | 1989 |
| Wellington Mortgage Finance Limited | Financial services | 2018 |
| Wellington Swords Fencing Club Limited | Arts & recreation | 2012 |
| Wellness Blueprint Ltd | Other services | 2021 |
| Wellness Health and Protection Limited | Financial services | 2018 |
| Wellsprings Community Church | Other services | 2011 |
| Wellsway Management Company Limited | Households | 2016 |
| Wemonitorit Ltd | Professional & scientific | 2025 |
| Wensley Farm Limited | Households | 2026 |
| Wentworth Computers Limited | Information & communication | 1996 |
| Wessex Business School Limited | Education | 2010 |
| Wessex Civil Engineering Consultants Limited | Professional & scientific | 2011 |
| Wessex Commercial Cleaning Ltd | Administrative & support | 2019 |
| Wessex Consulting Engineers Limited | Professional & scientific | 2024 |
| Wessex House Management Limited | Households | 2006 |
| Wessex Law Limited | Professional & scientific | 2014 |
| Wessex Property & Investments Ltd | Real estate | 2013 |
| Wessex Road (Taunton) Residents Company Limited | Households | 2001 |
| Wessex West Country Finance Limited | Real estate | 1981 |
| Wessig Limited | Health & social care | 2024 |
| West and Wales Hydrogen Ltd | Energy | 2020 |
| West Bradley Farm Limited | Agriculture & fishing | 2017 |
| West Country Cars Yeovil Limited | Wholesale & retail | 2007 |
| West Country Coatings Ltd | Construction | 2019 |
| West Country Fencing Supplies Limited | Wholesale & retail | 2012 |
| West Country Land Enterprises Limited | Other services | 2010 |
| West Country Land Limited | Real estate | 1998 |
| West Country Mechanical and Electrical Services Ltd | Construction | 2026 |