| Westgate Handling Services Limited | Transport & logistics | 1999 |
| Westlake Engineering Ltd | Manufacturing | 2019 |
| Westmade Hire LLP | | 2011 |
| Westmade Limited | Construction | 1977 |
| Westminster Road Management Company Limited | Households | 2019 |
| Westmont Projects Ltd | Construction | 2026 |
| Westnest Properties Ltd | Real estate | 2025 |
| Westover Private Office Ltd | Real estate | 2024 |
| Westray Estates Limited | Wholesale & retail | 1979 |
| Westwood Designs Ltd | Wholesale & retail | 2016 |
| Westwood Hall Management Company Limited | Households | 2007 |
| Wework Solutions Ltd | Administrative & support | 2025 |
| WFF IOM Ltd | Financial services | 2022 |
| Whalebone Management Limited | Households | 2017 |
| What NO Safety Services Limited | Construction | 2002 |
| What Today Feels Like Limited | Professional & scientific | 2025 |
| When Lulu MET Weasel Limited | Manufacturing | 2017 |
| Whesby Limited | Other services | 1964 |
| Whhv Holding Limited | Financial services | 2023 |
| Which School Limited | Information & communication | 1987 |
| White Computers Ltd | Information & communication | 2014 |
| White Cottages Downton Limited | Real estate | 2023 |
| White Engineering (Portland) Limited | Administrative & support | 2000 |
| White Horse Contracting Ltd | Agriculture & fishing | 2010 |
| White House Farm (Emersons Green) Management Company Limited | Households | 2022 |
| White Jasmine Ltd | Agriculture & fishing | 2026 |
| White Lifts Ltd | Construction | 2015 |
| White Pelican Ltd | Construction | 2025 |
| White Space Publishing Ltd | Information & communication | 2012 |
| White Space Trading Ltd | Wholesale & retail | 2020 |
| White's Scaffolding Ltd | Construction | 2023 |
| White-Fire Web Design Ltd | Information & communication | 2012 |
| Whiteburn Rookery Investments Limited | Real estate | 2016 |
| Whiteford Mews Management Company Limited | Households | 2013 |
| Whitehills Farm Ltd | Construction | 2001 |
| Whitehorn Farms Limited | Agriculture & fishing | 2017 |
| Whitehouse Farm (Hardway) Limited | Agriculture & fishing | 2012 |
| Whitelake Carpentry Ltd | Construction | 2022 |
| Whitelakehomes Ltd | Construction | 2025 |
| Whiteparish Hand Car Wash Ltd | Other services | 2022 |
| Whiteparish Village Store Limited | Wholesale & retail | 2005 |
| Whites Legal Services Limited | Administrative & support | 2017 |
| Whites Park Equestrian Ltd | Arts & recreation | 2023 |
| Whitethorn Designs Ltd | Wholesale & retail | 2024 |
| Whitsbury Green (Fordingbridge) Management Company Limited | Households | 2023 |
| Whyvonne Limited | Professional & scientific | 2013 |
| Wibl Foods Ltd | Manufacturing | 2018 |
| Wick & Flora Limited | Manufacturing | 2025 |
| Widebeam Digital Ltd. | Information & communication | 2009 |
| Widefitzfactory Ltd | Wholesale & retail | 2025 |
| Wight Caravan Company Limited | Hospitality | 2005 |
| Wilcox Wash Supplies Limited | Administrative & support | 1995 |
| Wild Network Limited | Information & communication | 2024 |
| Wild Wood Gifts Limited | Wholesale & retail | 2020 |
| Wildcatz Warriors CIC | Arts & recreation | 2024 |
| Wilde Beauty Limited | Manufacturing | 2011 |
| Wilding Landscape Group Ltd | Administrative & support | 2012 |
| Wildlife and Welfare | Arts & recreation | 2017 |
| Wildlife and Wellbeing CIC | Education | 2024 |
| Wildway Bushcraft Ltd | Education | 2018 |
| Wilkie Randall Limited | Professional & scientific | 2010 |
| Will Case & Partners LP | | 2013 |
| Will Rowlands Consultancy & Film Services Ltd | Information & communication | 2023 |
| Will Wise Estate Planning Limited | Professional & scientific | 2024 |
| Willan Partners Limited | Administrative & support | 2019 |
| William Howard Associates Limited | Administrative & support | 2011 |
| William Robert Industries Ltd | Professional & scientific | 2026 |
| William Stagg Financial Services Ltd | Professional & scientific | 2021 |
| Williams Assessors Ltd | Financial services | 2019 |
| Williams Developments and Commercial Properties Ltd | Real estate | 2023 |
| Willing Lightbulb Limited | Professional & scientific | 2011 |
| Willingdon Management Limited | Wholesale & retail | 1991 |
| Willow Boutique Hotels Limited | Hospitality | 2017 |
| Willow Green (March) Management Company Limited | Households | 2012 |
| Willow House (Alderholt) Management Company Limited | Households | 2024 |
| Willow Mews (Platt) Management Limited | Households | 2012 |
| Willow Rise (Bomere Heath) Management Company Limited | Households | 2025 |
| Willowbank Road (Alderton) Management Company Limited | Real estate | 2016 |
| Willpm Fitness Ltd | Arts & recreation | 2026 |
| Wilmot Associates Limited | Professional & scientific | 2011 |
| Wilsco 267 Limited | Agriculture & fishing | 1998 |
| Wilsford Antiques Limited | Wholesale & retail | 2024 |
| Wilsford Technologies LLP | | 2009 |
| Wilson and Wilson Building Contractors Limited | Construction | 1997 |
| Wilson Dennis Properties Limited | Households | 2025 |
| Wilson Investment Holdings Limited | Wholesale & retail | 1988 |
| Wilson Offshore Survey Ltd | Professional & scientific | 2026 |
| Wilson Plumbing Supplies Limited | Wholesale & retail | 1997 |
| Wilsons (Company Agents) Limited | Professional & scientific | 1993 |
| Wilsons (Company Secretaries) Limited | Professional & scientific | 1993 |
| Wilsons Employment Services Limited | Professional & scientific | 2004 |
| Wilsons Nominees Limited | Professional & scientific | 1993 |
| Wilsons Solicitors LLP | | 2007 |
| Wilsons Trust Corporation Limited | Other services | 2017 |
| Wilsonslaw Limited | Extraterritorial | 1992 |
| Wiltcr Limited | Professional & scientific | 2026 |
| Wiltech Services Ltd | Professional & scientific | 1999 |
| Wilton 1960 Limited | Extraterritorial | 2014 |
| Wilton Beeches Consulting Limited | Extraterritorial | 2011 |
| Wilton Estate (Stoford) LLP | | 2003 |