| Weston Edge Limited | Extraterritorial | 2017 |
| Weston Garages (Bath) Limited | Wholesale & retail | 2005 |
| Weston Holidays Limited | Real estate | 2020 |
| Weston Island Engineers Limited | Professional & scientific | 1896 |
| Weston Park Court Management Co (Bath) Limited | Households | 1972 |
| Westwell Green Limited | Real estate | 2025 |
| Westworld Management Limited | Households | 2002 |
| Weybrook House Development 2 Limited | Real estate | 2020 |
| Weybrook House Development Limited | Real estate | 2018 |
| Weymouth Court Management Limited | Households | 1987 |
| Weyone Property Ltd | Real estate | 2024 |
| WFN Enterprises Ltd | Real estate | 2024 |
| Wgad Ltd | Construction | 2024 |
| WH Store Limited | Hospitality | 2026 |
| Wham Properties Limited | Construction | 2018 |
| Whatever Outdoor Pursuits Ltd | Education | 2021 |
| Wheelchair Accessible Vehicles GB Limited | Wholesale & retail | 2008 |
| Wheelwrights Arms Bath Ltd | Hospitality | 2024 |
| Wheelwrite Media Limited | Information & communication | 2013 |
| Whelan London Ltd | Wholesale & retail | 2018 |
| Whereto Ltd | Hospitality | 2013 |
| Whiley and Co Ltd | Information & communication | 2017 |
| Whirlwind Holdings Ltd | Financial services | 2025 |
| Whisper and Shout Creative Limited | Professional & scientific | 2015 |
| Whitaker House Management Company Limited | Households | 2013 |
| White Horse Training Limited | Education | 1978 |
| White Kite Financial Limited | Financial services | 2010 |
| White Lion Garages (Pemberton) Limited | Other services | 1946 |
| White Mills Property Ltd | Real estate | 2016 |
| White OX Limited | Professional & scientific | 2006 |
| White Starling Ltd | Real estate | 2007 |
| White Wabbit Ltd | Information & communication | 2006 |
| Whitebox Architects Limited | Professional & scientific | 2012 |
| Whitecross Farm Business Park Ltd | Real estate | 2021 |
| Whitefriars City Estate Limited | Construction | 1994 |
| Whitehare Limited | Real estate | 1980 |
| Whitehorse Technical Ltd | Wholesale & retail | 2015 |
| Whiteladies Pharma Limited | Wholesale & retail | 2025 |
| Whitestar Services Limited | Information & communication | 2021 |
| Whitetracks Limited | Transport & logistics | 2003 |
| Whitetravel UK Limited | Administrative & support | 2017 |
| Whitney Services Ltd | Construction | 2018 |
| Whittles Landscapes Limited | Administrative & support | 2018 |
| Whitworth Law Limited | Professional & scientific | 2021 |
| Widcombe Consultants Limited | Professional & scientific | 2007 |
| Widcombe Laundry Company Limited | Other services | 2013 |
| Widcombe Spices Ltd | Hospitality | 2023 |
| Widcombe(Developments)Limited | Professional & scientific | 1961 |
| Wieslaw Dariusz Franczak Limited | Financial services | 2022 |
| Wightfish Limited | Administrative & support | 2021 |
| Wild & LYE Limited | Real estate | 2008 |
| Wild & Wool Limited | Arts & recreation | 2015 |
| Wild Cafe Limited | Hospitality | 2014 |
| Wild Fern Professional Decorating Ltd | Construction | 2023 |
| Wild FIG Ltd | Hospitality | 2019 |
| Wild Flour Cake Co Limited | Manufacturing | 2016 |
| Wild Fork West Ltd | Hospitality | 2015 |
| Wild Joy Ltd | Wholesale & retail | 2020 |
| Wild Pantry Ltd | Hospitality | 2021 |
| Wild Tales Ltd | Information & communication | 2023 |
| Wild Things Publishing Ltd | Information & communication | 2011 |
| Wild Vine Marketing Communications Limited | Professional & scientific | 2018 |
| Wild West Group Ltd | Hospitality | 2020 |
| Wilderness of MAN Limited | Education | 2025 |
| Wildfera Ltd | Manufacturing | 2026 |
| Wildheart Healthcare Ltd | Health & social care | 2023 |
| Wildheart Wealth Ltd | Real estate | 2025 |
| Wildings Limited | Wholesale & retail | 1912 |
| Wildman and Herring Limited | Professional & scientific | 2006 |
| Wildman Project Limited | Hospitality | 2014 |
| Wildwood Tree Surgeons LLP | | 2023 |
| Wilka Property Ltd | Real estate | 2019 |
| Wilkins Computing Services (WCS) Limited | Information & communication | 2013 |
| Wilkins Properties (UK) Limited | Construction | 2004 |
| Will Davis Design Limited | Professional & scientific | 2005 |
| Will PEN Limited | Real estate | 2024 |
| Willdrie Limited | Financial services | 2018 |
| William's Table PUB & Kitchen Ltd | Hospitality | 2026 |
| Williams and Oakey Engineering Company Limited | Manufacturing | 1977 |
| Williams-Ros Ltd | Information & communication | 2017 |
| Willment Bros Ltd | Real estate | 2020 |
| Willow Circle Ltd | Public administration | 2025 |
| Willow Gardeners Ltd | Administrative & support | 2022 |
| Willow Minds Limited | Information & communication | 2026 |
| Willow Tree Publishing Limited | Information & communication | 2014 |
| Willrow LLP | | 2026 |
| Wilson Futures Investments Limited | Real estate | 2020 |
| Wilson Futures Limited | Financial services | 2016 |
| Wilson Music Limited | Education | 2021 |
| Wilton Finch Capital Ltd | Real estate | 2019 |
| Wiltshire Electrics Limited | Construction | 2012 |
| Wiltshire Garden Renovations Limited | Administrative & support | 2023 |
| Wiltshire Health and Care LLP | | 2015 |
| Wiltshire Print Finishers Limited | Manufacturing | 2023 |
| Wiltshire Property Ltd | Real estate | 2022 |
| Wiltshire Storage Park Ltd | Transport & logistics | 2023 |
| Wiltshire Website Design Limited | Information & communication | 2017 |
| WIN Good Homes Ltd | Real estate | 2025 |
| Winchcombe Spinal Health Limited | Health & social care | 2021 |
| Winchester Excavations Committee | Information & communication | 2019 |