| Western Forestry Company Limited | Professional & scientific | 1987 |
| Western Forestry Nurseries Limited | Extraterritorial | 2001 |
| Western Industrial Services Limited | | 1962 |
| Western Management Services Limited | Administrative & support | 1994 |
| Westfield Barns (Shared Services) MAN Co Ltd | Households | 2023 |
| Westfield Barns (Water) Management Company Limited | Households | 2021 |
| Westfield Contracting Limited | Construction | 2018 |
| Westfield Homes (OGR) Limited | Construction | 2021 |
| Westfield Homes (South West) Limited | Construction | 2025 |
| Westgate Property Management Company Limited | Real estate | 1993 |
| Westgate-Hadden Development Company Limited | Construction | 1984 |
| Westgrove Investments Ltd | Real estate | 2025 |
| Westheath Investments | Financial services | 2018 |
| Westie Limited | Real estate | 2025 |
| Westleigh Solar Farm Limited | Energy | 2023 |
| Westminster Theological Centre | Education | 2008 |
| Weston Air International Limited | Transport & logistics | 1997 |
| Weston Aviation Management Limited | Extraterritorial | 2000 |
| Weston Aviation Support Limited | Transport & logistics | 2001 |
| Weston House Management Company Limited | Households | 2001 |
| Weston Light Bakery Co Ltd | Manufacturing | 2022 |
| Weston Orthodontic Centre Limited | Health & social care | 2011 |
| Weston SM LLP | | 2006 |
| Westvault Limited | Hospitality | 2011 |
| Westwold Limited | Financial services | 2022 |
| What a Difference a Day Makes Limited | Extraterritorial | 2009 |
| Whbc Nominee Secretaries Limited | Professional & scientific | 1998 |
| WHC Hire Services Holdings Ltd | Financial services | 2020 |
| WHC Hire Services Ltd. | Construction | 1997 |
| Wheal Beer Brewing Company Ltd | Manufacturing | 2019 |
| Wheel Good Vibes CIC | Wholesale & retail | 2022 |
| Wheelers (Legal Services) Ltd | Professional & scientific | 2015 |
| Whiskers Coffee Ltd | Wholesale & retail | 2021 |
| Whiskers Events Ltd | Hospitality | 2025 |
| Whiston Wealth Management Ltd | Financial services | 2021 |
| Whitaker Limited | Information & communication | 2004 |
| White Canvas Bridal Ltd | Wholesale & retail | 2023 |
| White Glove C Ltd | Administrative & support | 2025 |
| White Horses Trans Ltd | Wholesale & retail | 2021 |
| White House Gardens Residents Association Ltd | Real estate | 2019 |
| White Masai Limited | Administrative & support | 2017 |
| White Swan South West Ltd | Health & social care | 2024 |
| Whitefinch Ltd. | Extraterritorial | 2013 |
| Whitefriars Court Management Limited | Households | 2011 |
| Whitehall 23 Limited | Construction | 2022 |
| Whitehall Court (Investments) Limited | Real estate | 1988 |
| Whitehall Court Limited | Real estate | 1999 |
| Whitehall Dental Care Limited | Health & social care | 2016 |
| Whitemice Ltd | Hospitality | 2013 |
| Whitemove (Cheltenham) Limited | Administrative & support | 2017 |
| Whiteshill Investments Limited | Real estate | 2015 |
| Whitestoate Ltd | Other services | 2021 |
| Whitestrand Properties Limited | Real estate | 2013 |
| Whitfield Advisory Limited | Professional & scientific | 2014 |
| Whitfield Capital Investments Ltd | Financial services | 2023 |
| Whitfield Challenger Ltd | Administrative & support | 2025 |
| Whittington House (Management) Limited | Households | 2006 |
| Whittle & Baird Ltd | Manufacturing | 2017 |
| Whole System Approach Ltd | Professional & scientific | 2023 |
| Whosboardingme Limited | Other services | 2021 |
| Whymanity: Research and Training Ltd | Information & communication | 2013 |
| Wibble Creative Ltd | Arts & recreation | 2016 |
| Wick House Fairford Limited | Real estate | 2020 |
| Wicked Signs Ltd | Manufacturing | 2025 |
| Widetech Software Limited | Real estate | 1998 |
| Wiggin Holdings Limited | Financial services | 2021 |
| Wiggin Interactive Limited | Administrative & support | 2014 |
| Wiggin LLP | | 2004 |
| Wiggin Osborne Fullerlove LLP | | 2025 |
| Wightman Brown Limited | Professional & scientific | 2023 |
| Wigston Meadows 2 Management Company Limited | Households | 2025 |
| Wigwam Estates Limited | Real estate | 2007 |
| WIL EL MIL Engineering Limited | Manufacturing | 2004 |
| Wilco Homes Ltd | Construction | 2025 |
| Wilcox & Wilcox Ltd | Real estate | 2018 |
| Wild and Wilder Ltd | Extraterritorial | 2019 |
| Wild Boyz Ltd | Hospitality | 2026 |
| Wild Essence Limited | Other services | 2025 |
| Wild Palace Jewellery Limited | Wholesale & retail | 2021 |
| Wild Rock Ltd | Arts & recreation | 2008 |
| Wild Rocks Jewellery Limited | Manufacturing | 2017 |
| Wild Spot Studio Limited | Wholesale & retail | 2021 |
| Wilderspin Marketing Limited | Manufacturing | 2010 |
| Wildfire Property Investment Limited | Real estate | 2024 |
| Wildflower Illustration Co. Ltd | Wholesale & retail | 2016 |
| Wildfowl Preservation Limited | Extraterritorial | 2010 |
| Wilding OUT Limited | Other services | 2025 |
| Wildlife Custodians International Group Limited | Agriculture & fishing | 2025 |
| Wildskin Cosmetics Ltd | Wholesale & retail | 2024 |
| Wildwood Hideaways Limited | Financial services | 2025 |
| Wiles Greenworld Limited | Wholesale & retail | 1943 |
| Wilkin Mccune Limited | Professional & scientific | 2019 |
| Wilkins Property Holdings Ltd | Financial services | 2021 |
| Will Kane Limited | Administrative & support | 2021 |
| Willans LLP | | 2008 |
| Willans Property LLP | | 2026 |
| Willans Services Limited | Administrative & support | 2023 |
| Willans Trust Corporation Limited | Administrative & support | 2023 |
| Willengale Limited | Other services | 2001 |
| Willhosts Ltd | Administrative & support | 2013 |