| Wholesale Face Glow Limited | Wholesale & retail | 2025 |
| Wholesale Parts Limited | Wholesale & retail | 2012 |
| Wholetown Limited | Real estate | 1992 |
| Whyke Property Management Limited | Households | 2009 |
| Whynotrecords Ltd | Information & communication | 2025 |
| Whythawk Limited | Professional & scientific | 2008 |
| WI Estates Limited | Extraterritorial | 2022 |
| WI Property Holdings Limited | Real estate | 2017 |
| Wichita Holdings Ltd | Financial services | 2023 |
| Wicked Bars Ltd | Hospitality | 2024 |
| Wickers Building Maintenance Limited | Construction | 2019 |
| Wickham Bentley Management Co. Limited | Households | 1997 |
| Wickham Court Management Limited | Households | 2007 |
| Wickham Laboratories Holdings Limited | Professional & scientific | 2014 |
| Wide Engineering Solutions Limited | Manufacturing | 2019 |
| Widelist Investments Limited | Financial services | 1989 |
| Widgety Group Limited | Information & communication | 2026 |
| Widgety Limited | Information & communication | 2011 |
| Wight Homes Ltd | Construction | 2023 |
| Wight Table Limited | Hospitality | 2013 |
| Wilbec Construction Limited | Construction | 2023 |
| Wilcox and Partners Investments Limited | Real estate | 2021 |
| Wild Company Services Ltd | Professional & scientific | 2025 |
| Wild Direct Ltd | Wholesale & retail | 2026 |
| Wild Dog Academy Ltd | Education | 2023 |
| Wild Falcon Ltd | Administrative & support | 2016 |
| Wild Ginger Atelier Limited | Wholesale & retail | 2026 |
| Wild New Forest CIC | Professional & scientific | 2019 |
| Wildcat Creative Marketing Limited | Professional & scientific | 2005 |
| Wilder Awakening CIC | Education | 2025 |
| Wildern Architecture Limited | Professional & scientific | 2016 |
| Wildern View Limited | Households | 2013 |
| Wildgreens Limited | Other services | 2009 |
| Wilding Butler Construction Limited | Construction | 1993 |
| Wilding Tribe Supplement Co Limited | Hospitality | 2026 |
| Wilding Video Services & Consulting Ltd | Information & communication | 2018 |
| Wildwood Nutrition Ltd | Health & social care | 2019 |
| Will Hall Limited | Financial services | 2012 |
| Will Hall Properties (Alton) Limited | Real estate | 2008 |
| Will IT Fit Limited | Information & communication | 2017 |
| Willbox Limited | Wholesale & retail | 2000 |
| Willcox Consulting Limited | Information & communication | 2023 |
| Willcox Moss Dell & Co | | 1990 |
| Willcox Moss Dell & Co | | 1993 |
| Willda & Co. Ltd | Education | 2025 |
| Willett Marine Limited | Transport & logistics | 2012 |
| William Harvey Medical Limited | Agriculture & fishing | 2011 |
| William Irving Consulting Ltd | Professional & scientific | 2026 |
| William James Wealth Management Limited | Financial services | 2025 |
| William K Rail Ltd | Professional & scientific | 2016 |
| William Panter Court (Eastleigh) RTM Company Limited | Households | 2016 |
| William Tice Family Holdco Limited | Financial services | 2020 |
| William Tice Family Limited | Financial services | 2006 |
| Williams Logistics Ltd | Transport & logistics | 2025 |
| Williams Marine Lubricants Limited | Wholesale & retail | 1996 |
| Williams New Forest Creations Ltd. | Administrative & support | 2017 |
| Williams Property LLP | | 2011 |
| Williams Shipping Holdings Limited | Financial services | 1942 |
| Williams Shipping Marine Limited | Transport & logistics | 1988 |
| Williams Shipping Transport Limited | Transport & logistics | 2000 |
| Williams Squared Limited | Professional & scientific | 2016 |
| Williams Tucker Limited | Construction | 2023 |
| Williams Water Engineering Ltd | Construction | 2024 |
| Williamson Biotech Solutions Limited | Professional & scientific | 2016 |
| Willingsford Limited | Manufacturing | 2010 |
| Willington Property Management Ltd | Real estate | 2024 |
| Willis & Crockett Ltd | Construction | 2024 |
| Willma Wills and Estate Planning Ltd | Administrative & support | 2017 |
| Willma Wills Ltd | Professional & scientific | 2025 |
| Willow & Kole Limited | Manufacturing | 2026 |
| Willow Aerial Fitness C.I.C. | Arts & recreation | 2020 |
| Willow and Bear Gifts Limited | Wholesale & retail | 2023 |
| Willow PUB Co Ltd | Hospitality | 2026 |
| Willow River Consulting Ltd | Administrative & support | 2022 |
| Willow Tree Community CIC | Education | 2026 |
| WILLOW22 Cricketuk Limited | Wholesale & retail | 2026 |
| Willowbrook Veterinary Services Limited | Professional & scientific | 2013 |
| Willswood Equine Limited | Agriculture & fishing | 2020 |
| Willswood Farm Ltd | Agriculture & fishing | 2026 |
| Willy Meyer (UK) Limited | Manufacturing | 1992 |
| Wilsen Care and Security Limited | Financial services | 2022 |
| Wilshire Entertainment Limited | Information & communication | 2017 |
| Wilshire Ventures Limited | Extraterritorial | 2016 |
| Wilson & SON (Hursley) Limited | Real estate | 1954 |
| Wilson & Ward Electrical Services Limited | Construction | 2019 |
| Wilson Talent Consulting Limited | Administrative & support | 2019 |
| Wilton Avenue (10) Freehold Limited | Households | 2014 |
| Wilton Design Limited | Professional & scientific | 2016 |
| Wilton Village Holdings Limited | Real estate | 2023 |
| Wilton Village Shopping Management Company Limited | Real estate | 1997 |
| Wiltoneng Ltd | Manufacturing | 2025 |
| Wiltonhoe Management Limited | Households | 2021 |
| Wiltord Promotions Limited | Hospitality | 2003 |
| Wimborne Nails Ltd | Other services | 2026 |
| Wimpole Investments Limited | Construction | 1983 |
| WIN WIN Limited | Other services | 2016 |
| Winchester Academy of Modern Music Limited | Education | 2024 |
| Winchester Aesthetics Ltd | Other services | 2022 |
| Winchester Cab's Ltd | Transport & logistics | 2022 |
| Winchester Classics Limited | Wholesale & retail | 2021 |