| WINDOWS4TRADE Ltd | Construction | 2020 |
| Windrush (Salperton) Limited | Professional & scientific | 1995 |
| Windsock Aviation Ltd | Information & communication | 2020 |
| Windsor Drive (High Wycombe) Management Co. Limited | Real estate | 1974 |
| Windward Motor Group Ltd | Wholesale & retail | 2026 |
| Windy Edge Wealth Management Limited | Financial services | 2022 |
| Wine Goods Ltd | Wholesale & retail | 2021 |
| Wingfield and Hodgkin Limited | Real estate | 2021 |
| Wingnut Production Lighting Ltd | Administrative & support | 2009 |
| Winter Audio LLP | | 2023 |
| Winter Hill Eighteen Limited | Professional & scientific | 2002 |
| Winter Hill Thirty Nine Limited | Professional & scientific | 2004 |
| Winterview Ltd | Extraterritorial | 2025 |
| Wire Wizard Electrical Ltd | Construction | 2026 |
| Wire-Speed Ltd | Information & communication | 2023 |
| Wisdom Management Solutions Ltd | Professional & scientific | 2019 |
| Wise Consultant Services Limited | Other services | 2024 |
| Wiseadwise Ltd | Professional & scientific | 2026 |
| Wisedomix Limited | Information & communication | 2025 |
| Wisepaws Ltd | Information & communication | 2024 |
| Wishlanes Ltd | Wholesale & retail | 2024 |
| Wishmore Ltd | Wholesale & retail | 2021 |
| Witex Building Services Ltd | Construction | 2017 |
| Witham Court Managers Limited | Households | 2005 |
| Withershins Advisory Limited | Financial services | 2015 |
| Within Pictures Limited | Information & communication | 2023 |
| Witty Walnut Entertainment Ltd | Information & communication | 2025 |
| Wivenhoe Developments Ltd | Households | 2020 |
| Wiycombe 185 Ltd | Wholesale & retail | 2025 |
| Wizz Transport Ltd | Transport & logistics | 2023 |
| Wizza Limited | Wholesale & retail | 2002 |
| WM Windows Glass and Aluminium Ltd | Construction | 2021 |
| WMR Waste Solutions Limited | Water & waste | 2017 |
| Woburn Antiques Limited | Wholesale & retail | 2019 |
| Wodbox Ltd | Arts & recreation | 2025 |
| WOK Express High Wycomb Ltd | Wholesale & retail | 2015 |
| WOK Express Wycombe UK Ltd | Hospitality | 2017 |
| Wolfpac Investment Ltd | Construction | 2020 |
| Women Welcome Women World Wide | Other services | 1998 |
| Women's Cultural Arena CIC | Health & social care | 2017 |
| Women’S Health Equity Alliance CIC | Education | 2026 |
| Womnei Ltd | Other services | 2024 |
| WON Direction Ltd | Transport & logistics | 2013 |
| Wonderkids Group Ltd | Information & communication | 2025 |
| Wonderlyf Private Ltd | Wholesale & retail | 2026 |
| Wooburn Cars Ltd | Transport & logistics | 2019 |
| Wooburn Craft School Limited | Education | 2015 |
| Wooburn Express Ltd | Wholesale & retail | 2024 |
| Wooburn Grange Management Company Limited | Households | 1993 |
| Wooburnsales Ltd | Wholesale & retail | 2026 |
| Wood Farm Healthcare Limited | Wholesale & retail | 2025 |
| Woodjet Ltd | Manufacturing | 2010 |
| Woodland Build Ltd | Construction | 2025 |
| Woodlands Court (Dover) Limited | Construction | 2017 |
| Woodlite Products | | 1995 |
| Woodlux by Baani's Ltd | Construction | 2026 |
| Woods Prime (2022) Ltd | Real estate | 2022 |
| Woods Services Ltd | Professional & scientific | 2024 |
| Woodside Physiotherapy Clinic Limited | Health & social care | 2012 |
| Woodwaste Control Engineering Limited | Manufacturing | 1983 |
| Wootton Meadows Residents Association Limited | Extraterritorial | 2005 |
| Wordbird Limited | Professional & scientific | 2012 |
| Work in Progress Media Ltd | Information & communication | 2026 |
| Work Safety Solutions Limited | Wholesale & retail | 2011 |
| Workforge Solutions Ltd | Transport & logistics | 2024 |
| Working Solutions Consultants Limited | Information & communication | 1996 |
| Worknet Limited | Information & communication | 2005 |
| Worktop Worx Ltd | Manufacturing | 2026 |
| World of Food Retailer and Wholesaler Ltd | Wholesale & retail | 2017 |
| World Safety Professionals Ltd | Other services | 2024 |
| Worldclassthinkers Ltd | Information & communication | 2026 |
| Worldex Limited | Wholesale & retail | 2025 |
| Worldwide Language Resources Ltd | Professional & scientific | 2014 |
| Worldwide Rental Ltd | Hospitality | 2026 |
| Worldwide Travel Services UK Limited | Administrative & support | 2015 |
| Worleys Group Subco Limited | Wholesale & retail | 2025 |
| Worleys Retail Ltd | Wholesale & retail | 2025 |
| Wormsley Estate Limited | Agriculture & fishing | 1984 |
| Wotuno Ltd | Information & communication | 2023 |
| Wowrider Limited | Transport & logistics | 2020 |
| WPV Ventures Ltd | Hospitality | 2022 |
| WR Care Services Ltd | Health & social care | 2020 |
| Wrap N Roll Limited | Hospitality | 2025 |
| WRAPAROUNDCARE4U Ltd | Health & social care | 2012 |
| Wren Garden Services Ltd | Administrative & support | 2021 |
| Wright Business Advisory Ltd | Professional & scientific | 2026 |
| Wright Project Services Ltd | Information & communication | 2015 |
| Wright Real Estate Limited | Real estate | 2022 |
| Wright Signs & Print Limited | Manufacturing | 2021 |
| Wrights Meadow Centre | Arts & recreation | 2012 |
| Wrights Meadow Social Limited | Hospitality | 2016 |
| Wrightway Holiday Homes Limited | Real estate | 2025 |
| Wrightway Homes Ltd | Real estate | 2024 |
| Wrightway Structural Steels Ltd. | Construction | 2011 |
| WS Developments (Beaconsfield) Limited | Construction | 2025 |
| WT Painting Ltd | Construction | 2015 |
| WT Tribe Ltd | Administrative & support | 2025 |
| WTH Freehold Company Limited | Extraterritorial | 2013 |
| WUH Consultancy Limited | Professional & scientific | 2025 |
| WWR Management Company Limited | Real estate | 2010 |