| Will Barnes Agri Ltd | Agriculture & fishing | 2023 |
| Will Management Services Ltd | Other services | 2015 |
| Willcock Professional Services Ltd | Health & social care | 2022 |
| Willes Farming Limited | Agriculture & fishing | 2001 |
| William Reynolds House Management Company Limited | Households | 1994 |
| William Young Pianos Ltd | Wholesale & retail | 2019 |
| Williams & Cleal Furniture Limited | Manufacturing | 2007 |
| Williams Energy Networks Ltd | Professional & scientific | 2016 |
| Williams Equine Vets Ltd | Financial services | 2026 |
| Williamsfield Pastures Ltd | Financial services | 2025 |
| Williton Auto Services Limited | Wholesale & retail | 2012 |
| Williton MOT & Car Sales Limited | Wholesale & retail | 2020 |
| Williton Pet Care Ltd | Wholesale & retail | 2013 |
| Willment & SON Limited | Real estate | 2017 |
| Willow Business Consulting Ltd | Professional & scientific | 2011 |
| Willow Lodge Estates Ltd | Real estate | 2025 |
| Willow Solutions Limited | Agriculture & fishing | 2023 |
| Willowbrook Nursery & Garden Centre Limited | Wholesale & retail | 2011 |
| Willowgate Properties Ltd | Real estate | 2021 |
| Willowman Accountancy Services Limited | Professional & scientific | 2019 |
| Willstock Land Consortium Limited | Construction | 1997 |
| Wilson Bailey Partnership Limited | Professional & scientific | 2008 |
| Wilson LEE Ltd | Transport & logistics | 2019 |
| Wilstock Village Management Company Limited | Households | 2010 |
| Wilton and Sherford Community Interest Company | Health & social care | 2020 |
| Wilton Court (Management) Company Limited | Households | 2000 |
| Wilton Street Management Company Limited | Real estate | 2006 |
| Wilton Terrace (Taunton) Management Company Limited | Households | 2023 |
| Wiltown Garage Limited | Wholesale & retail | 2011 |
| Wiltshire Court Management (Taunton) Limited | Households | 1969 |
| Winchester Heath Limited | Real estate | 2024 |
| Winding Bridge Properties Limited | Real estate | 2023 |
| Windsor Properties (Taunton) Limited | Real estate | 1999 |
| Wine and Dandy Ltd | Wholesale & retail | 2026 |
| Wineberry Properties Limited | Real estate | 2006 |
| Wingate Motocycles Limited | Wholesale & retail | 2017 |
| Winkleigh Farm Glamping Limited | Hospitality | 2022 |
| Winlo Investments 2 Ltd | Real estate | 2016 |
| Winlo Investments Ltd | Real estate | 2015 |
| Winslade Future Investment Company Limited | Other services | 2019 |
| Winslade Property Company Limited | Real estate | 2019 |
| Winston First 40 Yacht Charters LLP | | 2011 |
| Winter BEE Consulting Ltd | Education | 2021 |
| WIRRALPET999 Limited | Professional & scientific | 2024 |
| Wiseman Energy Ltd | Energy | 2014 |
| Wiseman Lighting Ltd | Wholesale & retail | 2013 |
| Wisteria Court (Washford) Property Management Company Ltd | Real estate | 2021 |
| Wisteria Holidays Ltd | Hospitality | 2019 |
| With Impact Ltd | Extraterritorial | 2003 |
| Witkowski Holdings Limited | Wholesale & retail | 2020 |
| Wittlin Hart Ltd | Other services | 2023 |
| Wiveliscombe Area Partnership | Health & social care | 2002 |
| Wiveliscombe Cricket Club Limited | Arts & recreation | 2026 |
| Wiveliscombe Evangelical Congregational Church | Other services | 2025 |
| Wiveliscombe Hardware Limited | Wholesale & retail | 2017 |
| Wiveliscombe Homeopathic Surgery Limited | Health & social care | 2003 |
| Wivey Gym Ltd | Arts & recreation | 2017 |
| Wivey Larder Limited | Wholesale & retail | 2008 |
| Wizard Brothers Limited | Wholesale & retail | 2022 |
| WJG Storefitters (Nationwide) Limited | Wholesale & retail | 2003 |
| WLS Construction Ltd | Professional & scientific | 2023 |
| WML (Taunton) Limited | Construction | 2013 |
| WMS Trading Inc Ltd | Wholesale & retail | 2023 |
| WNE Enterprises Ltd | Health & social care | 2023 |
| Wohinglon Limited | Hospitality | 2007 |
| Wokingham North PCN Limited | Health & social care | 2023 |
| Wolfcon Ltd | Construction | 2022 |
| Wolford Farm Limited | Agriculture & fishing | 2025 |
| Wolfrun Ltd | Information & communication | 2013 |
| Womble Media Limited | Wholesale & retail | 2022 |
| Wonder of Wigs Ltd | Other services | 2024 |
| Wood Court Farm Limited | Agriculture & fishing | 2020 |
| Wood Street Garage (Taunton) Limited | Wholesale & retail | 2020 |
| Wood Supplies (South West) Limited | Other services | 2001 |
| Woodards Taunton Estate Management Limited | Households | 2004 |
| Woodbeer Gardens Management Agreement Limited | Households | 2017 |
| Woodcroft Developments (Taunton) Ltd | Real estate | 2024 |
| Woodhayne Farm Limited | Hospitality | 2020 |
| Woodland Play Centre Limited | Education | 2005 |
| Woodland Veterinary Surgery Ltd | Professional & scientific | 2025 |
| Woodland Way Farm Ltd | Agriculture & fishing | 2016 |
| Woodlands Castle Limited | Hospitality | 2012 |
| Woodley Arts Ltd | Manufacturing | 2019 |
| Woodley Locum Solution Ltd | Health & social care | 2019 |
| Woodlouse Conservation Limited | Construction | 2012 |
| Woodpecker Stables Limited | Financial services | 2022 |
| Woodram Associates LLP | | 2016 |
| Woodside Court Medical Clinic Limited | Health & social care | 2012 |
| Woodward Farms Ltd | Agriculture & fishing | 2020 |
| Wookid & Wyld Ltd | Wholesale & retail | 2022 |
| Wool Hayes Meadow Management Company Limited | Households | 2026 |
| Woolf Outdoor Limited | Wholesale & retail | 2020 |
| Word Gets Around Limited | Professional & scientific | 2015 |
| Word Gets Around Magazines Ltd | Professional & scientific | 2018 |
| Work for Health Limited | Health & social care | 2009 |
| Workglobe Developments Limited | Construction | 2014 |
| Working With JOE Ltd | Information & communication | 2013 |
| Worksights Ltd | Information & communication | 2024 |
| Worldwide Investment Ltd | Administrative & support | 2008 |
| Worth Estate Agents Limited | Real estate | 2025 |