| WER1HEART Ltd | Wholesale & retail | 2020 |
| Werter Lodge Limited | Real estate | 2009 |
| Weselllocal Group Limited | Wholesale & retail | 2020 |
| Weselllocal.Com Limited | Information & communication | 2020 |
| Wesley.Edwards Ltd | Transport & logistics | 2025 |
| Wessex Land & Estates Limited | Professional & scientific | 1988 |
| Wessleigh Limited | Hospitality | 2019 |
| West Associates (Olney) Limited | Professional & scientific | 2022 |
| West Bletchley Wellbeing Counselling Service CIC | Health & social care | 2014 |
| West Coast Resources Limited | Professional & scientific | 2023 |
| West Country Electrical Services Ltd | Construction | 2020 |
| West Dene School Educational Trust Limited | Education | 1961 |
| West EST Co. Limited | Construction | 2002 |
| West Herts Tools & Pressings Limited | Manufacturing | 2009 |
| West Highland Line Limited | Transport & logistics | 1994 |
| West Newland Ltd | Information & communication | 2025 |
| West Property Group England Ltd | Real estate | 2024 |
| West Rollan Limited | Professional & scientific | 2025 |
| West Ruislip(Block H)Management Company Limited | Households | 1985 |
| West Sands Creations Ltd | Other services | 2020 |
| West Wickham Brothers Ltd | Hospitality | 2020 |
| Westbar Contracting Limited | Construction | 2003 |
| Westbury Arts Centre | Arts & recreation | 2012 |
| Westcombe Recruitment Ltd | Information & communication | 2025 |
| Westcott Park NO 3 Residents Company Limited | Households | 1990 |
| Westee Solutions Ltd | Wholesale & retail | 2024 |
| Westerby Ltd | Other services | 2019 |
| Westerham Homes Ltd | Real estate | 2023 |
| Westeros Properties Limited | Real estate | 2022 |
| Westholm Management Company Limited | Households | 1988 |
| Westmark Estates Limited | Real estate | 2004 |
| Weston Maintenance Limited | Construction | 2024 |
| Westpool Chesterton Ltd | Real estate | 2018 |
| Westpool Jermyn Ltd | Real estate | 2018 |
| Westpool Woodbury Ltd | Real estate | 2018 |
| Westrucks Limited | Wholesale & retail | 1986 |
| Westview Business Solutions Ltd | Administrative & support | 2017 |
| Westview Services Limited | Other services | 2015 |
| Westwood House Partners LLP | | 2017 |
| Wevone Ltd | Administrative & support | 2018 |
| WEY DEM Limited | Professional & scientific | 2023 |
| Weyron Ltd | Health & social care | 2013 |
| Weztek Ltd | Information & communication | 2023 |
| Wfio Ltd | Information & communication | 2024 |
| WFW Ltd | Administrative & support | 2022 |
| WG Industrial Services Ltd | Other services | 2014 |
| Wgkims Ltd | Public administration | 2022 |
| Wgmuk Limited | Transport & logistics | 2016 |
| Whaddon Solutions Ltd | Construction | 2024 |
| Whaledrive Limited | Transport & logistics | 2026 |
| Wharf Lane Track Livery Ltd | Agriculture & fishing | 2026 |
| Wharfedale Roofing Limited | Construction | 2007 |
| Wharfside Electrical Wholesalers Limited | Manufacturing | 1999 |
| Wharfside Supplies Holdings Limited | Financial services | 2026 |
| Wharfside Supplies Ltd | Wholesale & retail | 2013 |
| What a Knob Games Ltd | Manufacturing | 2026 |
| Whatphone Limited | Wholesale & retail | 2025 |
| Whats New Ltd | Professional & scientific | 2025 |
| WHB Logistics Limited | Transport & logistics | 1988 |
| Wheatley Vision Limited | Construction | 2022 |
| Wheel Refurbs Direct Ltd | Wholesale & retail | 2026 |
| Wheels Academy Ltd | Education | 2025 |
| Wheels on Fire Limited | Administrative & support | 2016 |
| Wheelyst Ltd | Information & communication | 2026 |
| Wheelz&Dealz Ltd | Wholesale & retail | 2025 |
| Whimz Waffles Ltd | Wholesale & retail | 2022 |
| Whippendell Electrical Limited | Manufacturing | 1957 |
| Whippendell Limited | Professional & scientific | 1980 |
| Whippendell Marine Limited | Manufacturing | 1989 |
| Whistler Acquisitions Limited | Information & communication | 2016 |
| Whitbourn Financial Limited | Professional & scientific | 2013 |
| Whitburn Property Investments Ltd | Real estate | 2015 |
| White Bear PUB Ltd | Arts & recreation | 2010 |
| White Dott LLP | | 2014 |
| White Enigma Ltd | Wholesale & retail | 2023 |
| White Event Production Ltd | Professional & scientific | 2011 |
| White Kite Games Limited | Information & communication | 2026 |
| White Leopard Holdings Limited | Financial services | 2013 |
| White Leopard Limited | Other services | 2012 |
| White Magic Travels Ltd | Administrative & support | 2018 |
| White Oak PM Ltd | Construction | 2017 |
| White on Blue Limited | Other services | 2002 |
| White Orchid Salon Ltd | Other services | 2016 |
| White Peacock Care Limited | Health & social care | 2024 |
| White Pineapple Ltd | Professional & scientific | 2023 |
| White Roost Limited | Real estate | 2020 |
| White Star Memories Ltd | Arts & recreation | 2013 |
| White Universe Ltd | Professional & scientific | 2021 |
| White Vista Ltd | Financial services | 2023 |
| White Winds Limited | Information & communication | 2025 |
| White Wings Ltd | Transport & logistics | 2019 |
| Whitecap Leisure Limited | Arts & recreation | 2000 |
| Whitecastle Land Limited | Real estate | 2025 |
| Whitechurch Financial Planning Limited | Extraterritorial | 2012 |
| Whitedell Engineering Limited | Professional & scientific | 2013 |
| Whitehall Media Limited | Administrative & support | 2006 |
| Whitehomes PM Ltd | Real estate | 2018 |
| Whitehouse Consult Ltd | Real estate | 2020 |
| Whitehouse Solution Limited | Financial services | 2024 |
| Whiteleaf Financial Planning Ltd | Professional & scientific | 2020 |