| White Rose Park (Norwich) Residents Management Company Ltd | Households | 2018 |
| White Rose Park Homes Limited | Other services | 2025 |
| White Rose Paving & Landscaping Limited | Administrative & support | 2025 |
| White Stag Industrial Ltd | Professional & scientific | 2022 |
| White Syke Farm Ltd | Agriculture & fishing | 2014 |
| White Syke Fields Ltd | Arts & recreation | 2019 |
| White's Professional Painting and Decorating Ltd | Construction | 2021 |
| Whitehall Hardware Limited | Wholesale & retail | 2003 |
| Whitehorn Ltd | Construction | 2022 |
| Whitemoor Limited | Real estate | 2002 |
| Whiterose Engineering Ltd | Manufacturing | 2025 |
| Whiterose Motorworks Ltd | Wholesale & retail | 2025 |
| Whiterose Specialists Limited | Construction | 2011 |
| Whiterow Decorators Ltd. | Construction | 2015 |
| Whitestone Energy Limited | Professional & scientific | 2024 |
| Whitevilla Publishing Limited | Information & communication | 2017 |
| Whitewood Park (Bristol) Management Company Limited | Real estate | 2018 |
| Whitford Consultants Limited | Information & communication | 2026 |
| Whiting Decorators Ltd | Construction | 2024 |
| Whitland Cordova Limited | Professional & scientific | 2013 |
| Whitley Road Dental Limited | Health & social care | 2025 |
| Whitmore Place (Coventry) Residents Management Company Limited | Households | 2022 |
| Whitten Consulting Limited | Professional & scientific | 2024 |
| Whittles Joiners and Builders Limited | Construction | 2024 |
| Whitworth Dale Management Company Limited | Households | 2021 |
| Whixley Partners Limited | Information & communication | 2025 |
| WHL Building Services Limited | Construction | 2002 |
| WHL Building Services Trustees Limited | Other services | 2024 |
| Whole of the Moon Entertainment Ltd | Information & communication | 2014 |
| Wholesale Yorkshire Wines Ltd | Wholesale & retail | 2020 |
| Wholesalers & Distributors (UK) Ltd | Wholesale & retail | 2015 |
| Wholesavers Technologies Limited | Information & communication | 2024 |
| Wholsea Renewables Limited | Energy | 2013 |
| Whow Ltd | Financial services | 2019 |
| WHP Quantity Surveying Limited | Professional & scientific | 1999 |
| Whyte Towers Ltd | Administrative & support | 2026 |
| Wibblejelly Ltd | Manufacturing | 2009 |
| Wick 3 Nominees Limited | Professional & scientific | 1996 |
| Wicstun Brewery Ltd | Manufacturing | 2025 |
| Wicstun Limited | Professional & scientific | 2002 |
| Wicstun Surveying Services Ltd | Professional & scientific | 2016 |
| Widdy Holdings LLP | | 2025 |
| Wide Awake Living Ltd | Real estate | 2020 |
| Wide Awake Property Ltd | Real estate | 2017 |
| Wider Sky (Training) Ltd | Education | 2024 |
| Wieloch Ltd | Transport & logistics | 2021 |
| Wifi 4 Leisure Ltd | Information & communication | 2011 |
| Wiganthorpe Court Management Company Limited | Households | 1996 |
| Wigdahl Financial Services Ltd | Financial services | 2006 |
| Wigginton Dental Practice Limited | Health & social care | 2023 |
| Wigginton Road Nurseries Ltd | Wholesale & retail | 2003 |
| Wigginton Stores & Deli Ltd | Wholesale & retail | 2024 |
| Wilberfoss Developments Ltd | Construction | 2023 |
| Wilberfoss Project Management Ltd | Energy | 2021 |
| Wild & Westbrooke Limited | Wholesale & retail | 2018 |
| Wild Agency Ltd | Manufacturing | 2019 |
| Wild and Exotic Ltd. | Administrative & support | 2001 |
| Wild Brambles Ltd | Other services | 2025 |
| Wild Holdings UK Ltd | Real estate | 2025 |
| Wild Landscapes Ltd | Administrative & support | 2014 |
| Wild Rabbit Brewing Company Limited | Manufacturing | 2026 |
| Wild Rose Country Park Ltd | Hospitality | 2020 |
| Wild Spore Ltd | Agriculture & fishing | 2025 |
| Wild Streets Ltd | Information & communication | 2022 |
| Wild Wood Landscapes Ltd | Administrative & support | 2010 |
| Wilder Property Investments Ltd | Real estate | 2020 |
| Wildergoat Ltd | Wholesale & retail | 2026 |
| Wildflower Wildfire Limited | Arts & recreation | 2026 |
| Wildon Washes Limited | Wholesale & retail | 2013 |
| Wildtalk Limited | Wholesale & retail | 2008 |
| Wiles and Maguire Limited | Professional & scientific | 2001 |
| Wiles Ltd | Real estate | 2006 |
| Wilkinson Consulting Limited | Professional & scientific | 2024 |
| Wilks Builders and Joiners Limited | Construction | 2011 |
| Will & Freddies Limited | Wholesale & retail | 2011 |
| Will Jenkyns Voices Limited | Professional & scientific | 2014 |
| Will Slack Design Ltd | Professional & scientific | 2025 |
| Will Timney Limited | Professional & scientific | 2022 |
| Willaby Ltd | Construction | 2023 |
| William Birch & Sons Holdings Limited | Construction | 2025 |
| William Birch & Sons Limited | Construction | 1913 |
| William Birch Holdings Limited | Construction | 2015 |
| William Bridge,Limited | Agriculture & fishing | 1927 |
| William Brown Partners Limited | Professional & scientific | 2011 |
| William Dean Associates Limited | Professional & scientific | 2022 |
| William Giles Ltd | Wholesale & retail | 2021 |
| William Goodacre & Sons Wine Limited | Administrative & support | 2015 |
| William Leech Builders (North West) Limited | Extraterritorial | 1936 |
| William Leech Limited | Extraterritorial | 1911 |
| William Thomas Media Ltd | Information & communication | 2018 |
| Williams & Co. Limited | Professional & scientific | 2002 |
| Williams & Fogerty Limited | Real estate | 2013 |
| Williams & SON Horse Transport Ltd | Transport & logistics | 2025 |
| Williams & Williams FIC Limited | Extraterritorial | 2017 |
| Williams Brown Limited | Manufacturing | 2008 |
| Williams Claims Services Ltd | Financial services | 2012 |
| Willians Logistics Limited | Transport & logistics | 2015 |
| Willis Thover Limited | Financial services | 2025 |
| Willo Yorkshire Ltd | Real estate | 2024 |
| Willow and Bear Floral Design Limited | Wholesale & retail | 2020 |