| West Midlands Case Management Limited | Real estate | 2024 |
| West Midlands Property Services Limited | Real estate | 2025 |
| West Street (Fareham) Limited | Real estate | 2021 |
| West Street PMC Ltd | Real estate | 2017 |
| Westbourne Brickwork Limited | Construction | 2020 |
| Western Rose Global Limited | Public administration | 2024 |
| Westlake Consultancy Ltd | Professional & scientific | 2025 |
| Westlake Group Ltd | Financial services | 2019 |
| Westlake Information Technology Ltd | Information & communication | 2005 |
| Westminster Law Bournemouth Ltd | Professional & scientific | 2026 |
| Westminster Law Bristol Ltd | Professional & scientific | 2025 |
| Westminster Law Caerdydd Ltd | Professional & scientific | 2024 |
| Westminster Law Cheltenham Limited | Professional & scientific | 2023 |
| Westminster Law Chichester Ltd | Professional & scientific | 2025 |
| Westminster Law Cirencester Ltd | Professional & scientific | 2026 |
| Westminster Law Doncaster Ltd | Professional & scientific | 2026 |
| Westminster Law Dorset Ltd | Professional & scientific | 2026 |
| Westminster Law Eastbourne Limited | Professional & scientific | 2023 |
| Westminster Law Exeter Ltd | Professional & scientific | 2025 |
| Westminster Law Group Limited | Professional & scientific | 2023 |
| Westminster Law Haslemere Ltd | Professional & scientific | 2025 |
| Westminster Law Ltd | Professional & scientific | 2017 |
| Westminster Law Portsmouth Ltd | Professional & scientific | 2025 |
| Westminster Law Somerset Ltd | Professional & scientific | 2026 |
| Westminster Law South Yorkshire Ltd | Professional & scientific | 2026 |
| Westminster Law Southampton Ltd | Professional & scientific | 2024 |
| Westminster Law Support Ltd | Other services | 2020 |
| Westminster Law Teesdale Ltd | Professional & scientific | 2026 |
| Westminster Partnership Ltd | Professional & scientific | 2015 |
| Westminster South Limited | Professional & scientific | 2017 |
| Westminster Support Ltd | Professional & scientific | 2023 |
| Westminster Trusts Eastbourne Ltd | Professional & scientific | 2023 |
| Westminster Wealth Preservation Limited | Other services | 2018 |
| Westowen Estates Ltd | Real estate | 2007 |
| Westwind Maintenance Ltd | Construction | 2026 |
| Westwood (Fareham) Ltd | Extraterritorial | 2014 |
| Westwood Construction & Rail Services Limited | Construction | 2018 |
| Westwood OOH Limited | Professional & scientific | 2011 |
| WFP Management Ltd | Real estate | 2010 |
| WGS Motors Ltd | Wholesale & retail | 2024 |
| WH05DAT Ltd | Wholesale & retail | 2021 |
| What's OUT Limited | Professional & scientific | 2025 |
| Wheelers Bakery Limited | Wholesale & retail | 2002 |
| Wheels of Chalton Limited | Wholesale & retail | 2003 |
| Wheels UP Travel Ltd | Administrative & support | 2023 |
| Whiskers 'N' Beans Ltd | Professional & scientific | 2024 |
| Whispering Meadows Limited | Water & waste | 2003 |
| Whistle Property Limited | Administrative & support | 2022 |
| White & Sons Asphalt Ltd | Construction | 2025 |
| White Dirt Management Company Ltd | Households | 2019 |
| White Farming Ltd. | Agriculture & fishing | 1997 |
| White Hart IOW Ltd | Hospitality | 2016 |
| White Horse Country Retreat Ltd | Hospitality | 2023 |
| White Livelihood Ltd | Manufacturing | 2025 |
| Whitehall Apartments Freehold Limited | Real estate | 2016 |
| Whitehall Apartments RTM Company Limited | Real estate | 2014 |
| Whitehouse Surgical Limited | Health & social care | 2019 |
| Whittle Electrical Contractors Limited | Construction | 2001 |
| Wholeness Real Estate Properties Limited | Real estate | 2024 |
| Widely Mini Market Limited | Wholesale & retail | 2025 |
| Wiggco Bloodstock Limited | Arts & recreation | 2024 |
| Wiggco Holiday Lettings Ltd | Hospitality | 2023 |
| Wiggco Management Services Limited | Professional & scientific | 2010 |
| Wigglesworth Limited | Construction | 2014 |
| Wight Home Care Limited | Health & social care | 1999 |
| Wight Island Holidays Ltd | Administrative & support | 2023 |
| Wigwonders Ltd | Other services | 2013 |
| Wild IT Ltd | Energy | 2023 |
| Wild Mint Ltd | Hospitality | 2019 |
| Wild Souls Studio Ltd | Other services | 2025 |
| Wildway Limited | Real estate | 2001 |
| Wilgo Properties Ltd | Construction | 2020 |
| Wilkinson Real Estate Ltd | Real estate | 2025 |
| Willborough Homes Limited | Real estate | 2025 |
| Willers Stonecraft Limited | Administrative & support | 2021 |
| William Darcey Limited | Manufacturing | 2023 |
| William Group Ltd | Transport & logistics | 2023 |
| William North Properties Ltd | Real estate | 2025 |
| William Penny Stone and Stoves Limited | Construction | 2024 |
| Williams & Hirst Ltd | Other services | 2021 |
| Willoughby Technology Limited | Administrative & support | 2017 |
| Willow Home Development Limited | Construction | 2014 |
| Willow Services (Southern) Ltd. | Administrative & support | 2012 |
| Willows Wheels Limited | Transport & logistics | 2022 |
| Wilson & Melville Medical Services Limited | Health & social care | 2022 |
| Wilson House Developments Limited | Construction | 2001 |
| Wilson House Limited | Construction | 2005 |
| Wilson Lettings Ltd | Hospitality | 2025 |
| Wilson Smith Recruitment Limited | Administrative & support | 2002 |
| Wilsotech Global Limited | Professional & scientific | 2011 |
| Wiltom Ltd | Administrative & support | 2017 |
| Winchester Caravans Limited | Wholesale & retail | 2015 |
| Windmill Advisory Ltd | Professional & scientific | 2024 |
| Windmill Mortgage Solutions Ltd | Financial services | 2025 |
| Windmill Roofing Ltd | Construction | 2023 |
| Windowbright Limited | Administrative & support | 2019 |
| Windsor Oncology Centre Limited | Health & social care | 2017 |
| Wine That's Fruit Ltd | Wholesale & retail | 2019 |
| Winederland Ltd | Financial services | 2024 |
| Winged Company Ltd | Wholesale & retail | 2023 |