| Westrow Dental Surgery Limited | Health & social care | 2015 |
| Westrow PM Consultancy Limited | Information & communication | 2017 |
| Westwood Management Limited | Households | 1970 |
| Westwood Mansions Residents Association Limited | Households | 1973 |
| Westwood Marketing Ltd. | Professional & scientific | 2013 |
| Wetrade.Io Limited | Education | 2021 |
| Wetradeedu Ltd | Information & communication | 2025 |
| Weygate Ltd | Construction | 2025 |
| Weyhill Developments Limited | Construction | 2017 |
| Weyhill Lodge Management Company Limited | Households | 1994 |
| Weymouth Online Limited | Wholesale & retail | 2019 |
| WH Global Limited | Manufacturing | 2023 |
| WH Homes & Development Limited | Construction | 2026 |
| WHA Electrical Services Limited | Construction | 1986 |
| WHA Property Services Limited | Construction | 1994 |
| WHA Shopfitting Limited | Construction | 1990 |
| Wham BAM Tikka Ltd | Hospitality | 2021 |
| Wharf Mill Residents' Association Limited | Households | 2004 |
| Wharf Mill, Winchester, Residents Association Limited | Households | 1970 |
| Whatplot Limited | Real estate | 2019 |
| Whbrazqgi Ltd | Wholesale & retail | 2020 |
| Wheal Fawley Ltd | Other services | 2018 |
| Wheat-Barley Land Health Care Limited | Health & social care | 2025 |
| Wheel Alignment Solutions Ltd | Professional & scientific | 2021 |
| Wheel of Health Limited | Health & social care | 2009 |
| Wheelers Meadow Residents Company Limited | Real estate | 2004 |
| Wheels on Motion Limited | Wholesale & retail | 2024 |
| Wheely Clean Detailing Ltd | Administrative & support | 2026 |
| Whelan Pest Prevention Franchising Limited | Other services | 2014 |
| Which Restaurant Limited | Information & communication | 2015 |
| Whicher Medical Consultancy Ltd | Professional & scientific | 2019 |
| Whichway Media Limited | Information & communication | 2007 |
| Whipped UP Ltd | Hospitality | 2025 |
| Whirlwind Healthcare Writing Ltd | Information & communication | 2025 |
| Whisk World Studios Ltd | Information & communication | 2019 |
| Whiskers Retreat Ltd | Other services | 2025 |
| Whiskey Blue Ltd | Hospitality | 2021 |
| Whisky Cask Specialists UK Limited | Wholesale & retail | 2022 |
| Whistle Holdings Limited | Financial services | 2014 |
| Whistle Investments Limited | Financial services | 2014 |
| Whistle Limited | Energy | 1996 |
| Whistle NT Limited | Extraterritorial | 2014 |
| WHISTLE2 Limited | Administrative & support | 2014 |
| Whiston Pictures Limited | Information & communication | 2015 |
| Whit Four Limited | Transport & logistics | 2018 |
| Whit One Limited | Transport & logistics | 2018 |
| Whit Three Limited | Transport & logistics | 2018 |
| Whit Two Limited | Transport & logistics | 2018 |
| White & Co PLC | Transport & logistics | 1897 |
| White & Guard (Fair Oak) Limited | Real estate | 2019 |
| White & Guard (Hedge END) Limited | Real estate | 2013 |
| White & Guard (Holdings) Limited | Financial services | 2013 |
| White & Guard Residential Limited | Real estate | 2026 |
| White Build Ltd | Construction | 2025 |
| White Cubes TR Ltd | Transport & logistics | 2017 |
| White DOT Sailing Limited | Other services | 2019 |
| White Dragon Communications Limited | Professional & scientific | 2007 |
| White Gates Decorating Contractors Ltd | Wholesale & retail | 2008 |
| White House (Newquay) Limited | Real estate | 2025 |
| White House Property Investments Limited | Real estate | 2021 |
| White KNIGHT47 Ltd | Wholesale & retail | 2024 |
| White Lodge (Bassett) Management Limited | Households | 2007 |
| White Noise Technical Services Ltd | Information & communication | 2023 |
| White River Products Ltd | Wholesale & retail | 2025 |
| White Star Assets Management Limited | Administrative & support | 2015 |
| White Structures Limited | Professional & scientific | 2010 |
| White Van Lines Limited | Professional & scientific | 1955 |
| White Vape Co Ltd | Wholesale & retail | 2018 |
| White Whale Clothing Ltd | Extraterritorial | 2022 |
| White World Limited | Construction | 2023 |
| Whitefield Builders Ltd | Construction | 2022 |
| Whitefield Romsey Ltd | Construction | 2018 |
| Whitehaven Marina Limited | Real estate | 2008 |
| Whitehaven Property Developments Limited | Construction | 2017 |
| Whitehill Publishing Limited | Manufacturing | 1994 |
| Whitehorse PUB Group Ltd | Hospitality | 2021 |
| Whitehouse Financial Ltd | Administrative & support | 2020 |
| Whiteley Couriers (UK & European) Ltd | Transport & logistics | 2017 |
| Whiteley Property Services Ltd | Households | 2021 |
| Whiteley Technologies Limited | Information & communication | 2009 |
| Whitescore Ukeig | | 2011 |
| Whitewood Electronics Limited | Professional & scientific | 2013 |
| Whitfield Engineering Services Ltd | Professional & scientific | 2023 |
| Whitham Print Services Limited | Wholesale & retail | 2020 |
| Whitlock Solutions Ltd | Professional & scientific | 2023 |
| Whitman Builders Ltd | Construction | 2008 |
| Whitman Builders Southern Ltd | Construction | 2025 |
| Whitmoore LLP | | 2010 |
| Whitmore Consultancy Limited | Information & communication | 2012 |
| Whitport Limited | Transport & logistics | 1899 |
| Whitson Engineering Services Limited | Manufacturing | 1998 |
| Whitworth Road Court Limited | Households | 1992 |
| Whizz Automotive Ltd | Wholesale & retail | 2026 |
| Whizz Logistics Ltd | Transport & logistics | 2026 |
| Whizztech Slough Ltd | Real estate | 2018 |
| Whizztutor Ltd | Education | 2025 |
| WHO Gives a SIP Limited | Hospitality | 2025 |
| Whole Elise Limited | Education | 2022 |
| Whole Human Education Ltd | Education | 2023 |
| Wholesale Carpets and Flooring Ltd | Wholesale & retail | 2023 |