| W H Stone Pave Ltd | Administrative & support | 2025 |
| W M Hurd Building Services Limited | Construction | 2006 |
| W.R. Dyer & Sons Building Contractors Ltd | Construction | 2018 |
| W.S.Building Ltd | Construction | 2022 |
| Wadham Fencing Limited | Construction | 2012 |
| Wado-Ryu Karate-Do Academy Ltd | Education | 2026 |
| Wadys Cider Limited | Manufacturing | 2017 |
| Waite and Edwards Limited | Professional & scientific | 2019 |
| Waite Brothers Limited | Professional & scientific | 2009 |
| Wall Holdings Ltd | Construction | 2023 |
| Wallbridge Estates Ltd | Construction | 2021 |
| Walnutmepconsultants Limited | Professional & scientific | 2025 |
| Walp Limited | Water & waste | 2026 |
| Walrond Holdings Limited | Real estate | 2000 |
| WAN JIA LE JIN Limited | Hospitality | 2017 |
| Warlord Electronics Limited | Information & communication | 1989 |
| Warner Heating Limited | Construction | 2025 |
| Warren and Street Ltd | Hospitality | 2019 |
| Watavi UK Ltd | Wholesale & retail | 2025 |
| Waterbridge Press Ltd | Information & communication | 2023 |
| Waterford Park (Isleport) Ltd | Construction | 2021 |
| Watergate Tynte Arms Limited | Hospitality | 1995 |
| Watson Properties South West Limited | Real estate | 2025 |
| Wave Function Consultancy Limited | Professional & scientific | 2017 |
| Way TOO Glassy Limited | Extraterritorial | 2025 |
| Wbuildsmart Ltd | Construction | 2025 |
| WE ARE Earthed Limited | Professional & scientific | 2023 |
| WE Bring IT Group Limited | Information & communication | 2024 |
| Weatherguard Engineering Limited | Construction | 2001 |
| Web Scaffolding Ltd | Construction | 2024 |
| Webb's Rigging Ltd | Information & communication | 2020 |
| Webber & Evans Limited | Real estate | 2023 |
| Welcome Home Somerset Ltd | Real estate | 2021 |
| Wellington Landscaping and Construction Ltd | Construction | 2025 |
| Wellingtonsheds Ltd | Manufacturing | 2020 |
| Wells Farm Supplies Group Limited | Professional & scientific | 2019 |
| Wells Farm Supplies Limited | Wholesale & retail | 2004 |
| Wembdon Cricket Club Limited | Arts & recreation | 2019 |
| Wembdon Village Hall Ltd | Hospitality | 2020 |
| Wessex Associated Industries Limited | Manufacturing | 2007 |
| Wessex Lifting Services Ltd | Construction | 2019 |
| Wessex UK Holdings Ltd | Administrative & support | 2018 |
| West Country Calves Limited | Agriculture & fishing | 1981 |
| West Country Drainage Services Ltd | Construction | 2020 |
| West Country Garage Limited | Wholesale & retail | 2010 |
| West Country Heating Ltd | Construction | 2018 |
| West Country Maintenance Ltd | Construction | 2025 |
| West Country Property Holdings SW Ltd | Real estate | 2025 |
| West India House Limited | Hospitality | 2025 |
| West Quay Cafe Ltd | Hospitality | 2024 |
| WEST11 Group Limited | Wholesale & retail | 2015 |
| Westborough Drive Ltd | Real estate | 2025 |
| Westbrook Group Limited | Construction | 2020 |
| Westbrook Property Holdings Limited | Real estate | 2025 |
| Westbury Leigh Developments Limited | Real estate | 2019 |
| Westbury Secretarial Services Limited | Administrative & support | 1999 |
| Westcliffe House Limited | Administrative & support | 1997 |
| Westcountry Bathrooms Ltd | Construction | 2019 |
| Western Counties Property Maintenance Ltd | Construction | 2024 |
| Western Farm Development Limited | Real estate | 2021 |
| Westmoor Associates Ltd | Information & communication | 2013 |
| Weston Beach Café South West Limited | Hospitality | 2018 |
| Weston Hill Cottage Management Limited | Real estate | 2021 |
| Weston T Limited | Wholesale & retail | 2017 |
| Westside Management Services ( South West) Ltd | Construction | 2021 |
| WET and High Adventures Limited | Education | 2015 |
| WH Survey Services Ltd | Construction | 2026 |
| Wheeler & SON Limited | Transport & logistics | 1980 |
| Wheelie Fresh Limited | Administrative & support | 2013 |
| Whitbread Foods Ltd | Hospitality | 2018 |
| Whitby Services Limited | Real estate | 1998 |
| White Hart Computer Services Ltd. | Information & communication | 2004 |
| White Raven Carpentry Ltd | Manufacturing | 2025 |
| Whitelegg Group Ltd | Hospitality | 2021 |
| Whites Tiling & Flooring Services Ltd | Construction | 2022 |
| Whitestone Auto Electronic Limited | Wholesale & retail | 2021 |
| Whitingpouting Ltd | Hospitality | 2025 |
| Wide Asleep Music Limited | Information & communication | 2023 |
| Williams Planning Ltd | Professional & scientific | 2022 |
| Willow Brook Cottages Ltd | Construction | 2022 |
| Willows Mgmt Company Limited | Households | 2025 |
| Wills Electrical Services (SW) Ltd | Construction | 2024 |
| Wilson's Park Homes Sales Ltd | Real estate | 2025 |
| Wilson's Siting Services Limited | Construction | 2024 |
| Windermere House Management Company Limited | Households | 1986 |
| Windrock Investments | Professional & scientific | 2026 |
| Windscreen Warehouse Limited | Wholesale & retail | 2005 |
| Wing Leader Ltd | Wholesale & retail | 2013 |
| Wink Limited | Other services | 2004 |
| Winrow Limited | Agriculture & fishing | 1997 |
| Winter Web Ltd | Construction | 2024 |
| Wise Workshop Ltd | Manufacturing | 2021 |
| Withygrove Ltd | Professional & scientific | 2013 |
| Withypool Oak Limited | Hospitality | 2024 |
| Wixay Ltd | Wholesale & retail | 2025 |
| WJH Auto Ltd | Wholesale & retail | 2019 |
| WJR Car & Commercial Services Ltd | Wholesale & retail | 2020 |
| WJT Consulting Solutions Ltd | Professional & scientific | 2026 |
| WK Studio Ltd | Professional & scientific | 2020 |
| WMC Partnership Ltd | Construction | 2025 |