| Wexford Court (Maidenhead) Limited | Households | 1985 |
| Wgtss Ltd | Wholesale & retail | 2018 |
| Wheeler Advisory Limited | Professional & scientific | 2026 |
| Wheelhouse Advisory Ltd | Professional & scientific | 2024 |
| Wheeliegoodfirewood Ltd | Agriculture & fishing | 2021 |
| Wheels 'N Wheels Limited | Transport & logistics | 2017 |
| Whelan Farms Limited | Agriculture & fishing | 1980 |
| Where Would YOU Rather BE ? Limited | Administrative & support | 2021 |
| Whinney Hill Stone Sales Limited | Extraterritorial | 1985 |
| White Blossom Estates Limited | Real estate | 2024 |
| White DOT London Ltd | Wholesale & retail | 2023 |
| White Express Ltd | Transport & logistics | 2018 |
| White Space Events Ltd | Real estate | 2005 |
| White Technology Services Ltd | Professional & scientific | 2013 |
| White Waltham Airfield Limited | Arts & recreation | 1992 |
| White Waltham Garage Limited | Wholesale & retail | 1984 |
| Whitehill & Ardenham Estates Limited | Real estate | 2023 |
| Whitehouse Veterinary Services Ltd | Professional & scientific | 2018 |
| Whitelyte Limited | Construction | 2022 |
| Whiterok Properties Ltd | Extraterritorial | 2023 |
| Whitfield Electrical Services Limited | Construction | 2018 |
| Whitstable Nest Ltd | Construction | 2015 |
| Whitton Mcintyre Limited | Construction | 1997 |
| Whole Value Ltd | Wholesale & retail | 2023 |
| Whytehall Car Collection Limited | Wholesale & retail | 2016 |
| Widbrook Investments Ltd | Real estate | 2018 |
| Widneyland Limited | Real estate | 1983 |
| Wifime Ltd | Information & communication | 2005 |
| Wightcode Consulting Limited | Information & communication | 2014 |
| Wildwood Retail Design LLP | | 2016 |
| Williamson & Price Property Ltd | Real estate | 2020 |
| Williamston Nursing Home Limited | Health & social care | 1993 |
| Willmott Marlow Limited | Professional & scientific | 1989 |
| Willow ICT Advisory Ltd | Information & communication | 2024 |
| Willow Real Estates Ltd | Construction | 2015 |
| Willow Waste (SE) Ltd | Water & waste | 2025 |
| Willow Waste Ltd | Water & waste | 2015 |
| Wilson Chambers Holdings Limited | Financial services | 2025 |
| Wilson Chambers Limited | Financial services | 2010 |
| Wilson Lodgings Limited | Real estate | 2019 |
| Wilson Partners Limited | Professional & scientific | 2004 |
| Wimbledon Cleaning Company Services Limited | Professional & scientific | 2012 |
| Winbury Place Management Limited | Real estate | 2008 |
| Wincleland Limited | Real estate | 2016 |
| Windcraft Limited | Manufacturing | 1986 |
| Windermere Management (Maidenhead) Limited | Households | 1994 |
| Windsor & Ascot Landscaping Limited | Administrative & support | 2018 |
| Windsor Chinese Guardianship Ltd | Education | 2018 |
| Windsor Formal Hire Limited | Manufacturing | 2011 |
| Windsor Horse Rangers Limited | Other services | 2003 |
| Windsor Horse Transport Limited | Transport & logistics | 2024 |
| Wineholm Limited | Financial services | 1997 |
| Winsloe Ltd | Wholesale & retail | 2022 |
| Winter Garden Pictures Ltd | Information & communication | 2016 |
| Winter Lantern Creative Limited | Information & communication | 2025 |
| Wippasnappa Aerial Ltd | Professional & scientific | 2023 |
| Wise Building Solutions Limited | Construction | 2021 |
| Wiseman Bidco Limited | Financial services | 2021 |
| Wiseman Topco Limited | Financial services | 2021 |
| Wislore Ltd | Professional & scientific | 2022 |
| Wisteria London Limited | Wholesale & retail | 2016 |
| With Love, Shellie Ltd | Wholesale & retail | 2021 |
| With Thanks Limited | Professional & scientific | 2025 |
| Wizontheweb Limited | Information & communication | 2015 |
| WKR Stables Ltd | Real estate | 2025 |
| WLB Contractors Limited | Construction | 2016 |
| WM Bathrooms Limited | Construction | 2020 |
| Wm.E.Christer (Gravel) Limited | Extraterritorial | 1949 |
| Wmso Productions Limited | Arts & recreation | 2017 |
| WMW Trading Ltd | Wholesale & retail | 2018 |
| Wokingham Festival Limited | Arts & recreation | 2009 |
| Wonders of Food Ltd | Professional & scientific | 2020 |
| Woodbury Close Property Management Ltd | Real estate | 2011 |
| Woodfell Tech Ltd | Information & communication | 2022 |
| Woodford Investment Management Limited | Financial services | 2016 |
| Woodside Business Services Limited | Information & communication | 2015 |
| Woodside Business Transformation Limited | Professional & scientific | 2012 |
| Woodside Trading Limited | Health & social care | 2011 |
| Woodsmyth Finance Limited | Professional & scientific | 2025 |
| Woody the Waste Pecker Ltd | Water & waste | 2025 |
| Woodyard Logistics Ltd | Manufacturing | 2023 |
| Woof Paradise Limited | Agriculture & fishing | 2026 |
| Woottonwines UK Ltd | Wholesale & retail | 2022 |
| Word Monster Australia Limited | Financial services | 2021 |
| Word Monster Limited | Professional & scientific | 2016 |
| Wordaholic Limited | Arts & recreation | 2013 |
| Work Hard 7 Groups Ltd | Construction | 2020 |
| Working Mums Cleaning Service Ltd | Administrative & support | 2025 |
| Workskr Ltd | Professional & scientific | 2025 |
| Workumbrella Ltd | Administrative & support | 2022 |
| World V Ltd | Financial services | 2023 |
| World Wide Access UK Limited | Wholesale & retail | 2008 |
| World Wide IT Solutions Limited | Information & communication | 2018 |
| Worsfold Limited | Arts & recreation | 2017 |
| Worthing Ltd | Wholesale & retail | 2020 |
| WP Audit Limited | Professional & scientific | 2011 |
| WP Wealth Management LLP | | 2011 |
| WPA (Southern) Ltd | Construction | 2024 |
| WPD Productions Ltd | Construction | 2013 |
| WR Consultancy Limited | Professional & scientific | 2022 |