| Wallnuts Heritage Ltd | Construction | 2026 |
| Ward Warehousing Limited | Real estate | 1981 |
| Wasyl Ltd | Transport & logistics | 2020 |
| Watts Accountants Limited | Professional & scientific | 2026 |
| Watts Automotive Ltd | Transport & logistics | 2018 |
| Watts Desser Limited | Financial services | 2015 |
| Watts Investment Holdings Limited | Financial services | 2025 |
| Watts Memorials Limited | Manufacturing | 2025 |
| Watts of Lydney Group Limited | Professional & scientific | 1920 |
| Watts Truck & Van (Swansea) Limited | Extraterritorial | 1984 |
| Watts Truck & Van Limited | Wholesale & retail | 1986 |
| Watts Truck Holdings Ltd | Financial services | 2025 |
| Watts Tyres Limited | Professional & scientific | 1999 |
| Waycott Bros. Limited | Wholesale & retail | 1963 |
| Waycotts Limited | Agriculture & fishing | 1980 |
| Waylink Limited | Wholesale & retail | 1978 |
| Wayne Parry Flooring Ltd | Wholesale & retail | 2012 |
| Wearable Intelligence (Nano) Ltd | Manufacturing | 2022 |
| Wearable Nano Electronics Ltd | Professional & scientific | 2022 |
| Wearable Nano Medicines Ltd | Professional & scientific | 2020 |
| Wellnix Ltd | Health & social care | 2025 |
| Wellvere Ltd | Wholesale & retail | 2026 |
| WG Building and Carpentry Services Limited | Construction | 2026 |
| White Feather Services Ltd | Hospitality | 2020 |
| Whitecroft BMJ Limited | Professional & scientific | 2014 |
| Whitecroft Holdings Ltd | Administrative & support | 2023 |
| Whitecroft Properties Limited | Real estate | 2003 |
| Wild Heart Crafting Ltd | Wholesale & retail | 2018 |
| Wild Roots Outdoor Nursery Ltd | Health & social care | 2025 |
| Wildboar Weightlifting Ltd | Arts & recreation | 2022 |
| Wildin (Accountants & Auditors) Limited | Professional & scientific | 2021 |
| Wildin (Auditors) Limited | Professional & scientific | 2022 |
| Wildin Financial Services Ltd | Financial services | 2024 |
| Wildin Probate Ltd | Public administration | 2021 |
| Wildin Professional Ltd | Professional & scientific | 2017 |
| Wildlings ED CIC | Education | 2024 |
| Willow Tree Ventures Ltd | Hospitality | 2019 |
| Wiltshire Signature Spraying Ltd | Construction | 2026 |
| Winchcomb Electrical Ltd | Construction | 2025 |
| WM Parry & Sons Limited | Wholesale & retail | 2018 |
| Woodgate Enterprises Ltd. | Real estate | 2007 |
| Woodman PUB Management Ltd | Hospitality | 2014 |
| Worgan Quality Services Ltd | Professional & scientific | 2024 |
| Wraith Engineering Limited | Wholesale & retail | 2002 |
| WRB Consulting Limited | Professional & scientific | 2004 |
| Wt&V Limited | Professional & scientific | 2007 |
| WTV Estates Ltd | Real estate | 2025 |
| WYE Pursuits Limited | Arts & recreation | 2007 |
| WYE Valley Experience Limited | Arts & recreation | 2022 |
| WYE Valley Flowers Ltd | Agriculture & fishing | 2008 |
| WYE View Management Company Limited | Real estate | 2007 |
| Wye-Bikes Ltd | Administrative & support | 2018 |
| Wyedean Electrical Ltd | Manufacturing | 2022 |
| Wyelands Estates Limited | Agriculture & fishing | 1976 |
| Xite Energy Limited | Manufacturing | 2017 |
| Xite Racing Ltd | Wholesale & retail | 2020 |
| Yarworth Developments Limited | Construction | 2025 |
| Yeocurtis LLP | | 2019 |
| YEW Tree Services 2023 Ltd | Professional & scientific | 2023 |
| Yokohama TWS UK Limited | Wholesale & retail | 1979 |
| Yorkley Court Farm Ltd | Agriculture & fishing | 2014 |
| Yorkley Stores Limited | Wholesale & retail | 2021 |
| YPB Events Limited | Arts & recreation | 2023 |
| Zego Marine (UK) Limited | Wholesale & retail | 2009 |
| ZEN Cubs Limited | Other services | 2024 |
| Zenco Limited | Information & communication | 2013 |
| Zett Letts Limited | Real estate | 2014 |
| Zizzoo Office Supplies & Solutions Limited | Wholesale & retail | 2017 |