| Well Able Limited | Financial services | 2018 |
| Well Puff Limited | Wholesale & retail | 2025 |
| Wellable Care Services Limited | Health & social care | 2024 |
| Wellow Securities Limited | Construction | 2006 |
| Wellowgate Convenience Limited | Wholesale & retail | 2026 |
| Wellowgate Mews (Management) Limited | Households | 1993 |
| Wells Barn Limited | Extraterritorial | 2002 |
| Wellspring Healing Limited | Information & communication | 2024 |
| Weproduce Limited | Information & communication | 2012 |
| Wesley Gardens Management Company Limited | Professional & scientific | 2024 |
| West Marsh Construction Limited | Construction | 2007 |
| West Marsh Development Trust Association Ltd | Health & social care | 2005 |
| West,Bartram and Clark Limited | Administrative & support | 1965 |
| Westbrook Fields Limited | Health & social care | 2021 |
| WESTEC1 Ltd | Information & communication | 2018 |
| Western Car Services Ltd | Transport & logistics | 2016 |
| Westholme ROE Limited | Health & social care | 2020 |
| Westlands Heating Limited | Construction | 2010 |
| Westside Bathrooms Limited | Other services | 2019 |
| Westwood Holdings Ltd | Real estate | 2025 |
| WGM Control Solutions Ltd | Manufacturing | 2014 |
| Whall 2 Whall Builders Limited | Construction | 2003 |
| Whatbox Consulting Ltd | Professional & scientific | 2019 |
| Wheelz Mobile Valeting Ltd | Administrative & support | 2018 |
| Whiffin Vincent Limited | Administrative & support | 2017 |
| Whinnett Healthcare Consultants Ltd | Health & social care | 2015 |
| Whippylicks Limited | Hospitality | 2018 |
| White Cornerstone Developments Ltd | Real estate | 2022 |
| White Electrical Services Ltd | Construction | 2003 |
| White Rabbit Law Ltd | Professional & scientific | 2026 |
| Whitehall Country Cottages Limited | Households | 1994 |
| Whitelam Holdings Ltd | Real estate | 2023 |
| Whitelove Properties Ltd | Real estate | 2023 |
| Whitfield Associates Ltd | Administrative & support | 2018 |
| Whittletongreenbuild Limited | Energy | 2025 |
| Whyles Enterprises Ltd | Financial services | 2016 |
| WIG Master Ltd | Manufacturing | 2021 |
| Wil-Lec GRP Limited | Construction | 2006 |
| Wilca & Co. Seafoods Ltd | Manufacturing | 2024 |
| Wilchap Nominees Limited | Professional & scientific | 1998 |
| Wilde & Wilde Limited | Financial services | 1990 |
| Wildflower Park Management Company Limited | Households | 2024 |
| Wilgrave Tyre Services Limited | Wholesale & retail | 2002 |
| Wilkin Chapman Company Secretarial Services Limited | Administrative & support | 1988 |
| Wilkin Chapman Group Ltd | Professional & scientific | 2005 |
| Wilkin Chapman LLP | | 2009 |
| Wilkins Roofing Limited | Construction | 2003 |
| Will Capital Ltd | Real estate | 2019 |
| Will Group Global Ltd | Construction | 2022 |
| Willanna Limited | Agriculture & fishing | 2011 |
| Willerby Construction & Roofing Contractors Ltd | Construction | 2017 |
| William Race Limited | Hospitality | 2016 |
| Williams Roofing Services Ltd | Construction | 2026 |
| Williams-Newman Heating and Plumbing Ltd | Construction | 2019 |
| Willingham FEN Marina Limited | Transport & logistics | 2022 |
| Willingham Street Management Company Limited | Real estate | 2007 |
| Willow Lakes (Ashby Hill Top Farm) Limited | Hospitality | 2009 |
| Willow Lakes Country Park Limited | Construction | 2018 |
| Willow Land Management Limited | Administrative & support | 2011 |
| Willows Barber Ltd | Other services | 2024 |
| Willows Tanning Studio Ltd | Other services | 2023 |
| Willowstone Motor Trading Limited | Wholesale & retail | 2023 |
| Wilson & Co (KIA) Ltd | Wholesale & retail | 2012 |
| Wilson & Co. (Motor Sales) Limited | Wholesale & retail | 1998 |
| Wilson & Co. Estates Limited | Financial services | 2026 |
| Wilson Damp Proofing Ltd | Construction | 2024 |
| Wilson Legal Consultants Ltd | Transport & logistics | 2018 |
| Wilson Properties Falkirk Limited | Real estate | 2026 |
| Wilson Renewable Ltd | Construction | 2026 |
| Wilson Safety Solutions Ltd | Professional & scientific | 2023 |
| Wilton Cobley (Holdings) Limited | Financial services | 2016 |
| Wilton Road Storage Ltd | Professional & scientific | 2019 |
| Win@Dreancashgivaways.Co.Uk Limited | Arts & recreation | 2024 |
| Wind Farm IRM Services Ltd | Professional & scientific | 2012 |
| Wind Offshore Ltd | Manufacturing | 2019 |
| Winder Constructions Ltd | Construction | 2025 |
| Windoor Online Limited | Construction | 2018 |
| Winie Services Ltd | Hospitality | 2024 |
| Winnies Grooming Services Ltd | Other services | 2021 |
| Winsek Properties Limited | Real estate | 2017 |
| Winston Bars Ltd | Hospitality | 2020 |
| Wintertherm Limited | Construction | 2016 |
| Wiseman Design Engineering Ltd | Professional & scientific | 2019 |
| Wiseman Property Solutions Ltd | Real estate | 2024 |
| Wish Interiors Limited | Manufacturing | 2009 |
| WIX Holdings Ltd | Real estate | 2018 |
| Wizer CIC | Professional & scientific | 2021 |
| WJE Services Limited | Professional & scientific | 2016 |
| WK1 Transport Ltd | Transport & logistics | 2022 |
| WKR Safety Ltd | Other services | 2021 |
| WLS Project Controls Ltd | Construction | 2014 |
| WMB Construction Limited | Construction | 2003 |
| WND Construction Management Limited | Administrative & support | 2015 |
| WOK Noodles Limited | Hospitality | 2021 |
| Wold Print Limited | Administrative & support | 2003 |
| Wolds Consultancy Limited | Real estate | 2023 |
| Wolds Design Limited | Administrative & support | 2012 |
| Wolds Homes Ltd | Construction | 2021 |
| Wolds Medical Group (Holdings) Limited | Professional & scientific | 2025 |
| Wolds Medical Limited | Health & social care | 2020 |