| Wild Green Blossoms CIC | Education | 2025 |
| Wildways Therapy CIC | Administrative & support | 2015 |
| Willdabeast Productions Limited | Information & communication | 2021 |
| Williams Group Limited | Real estate | 2005 |
| Willis Dawson Limited | Professional & scientific | 2016 |
| Willow House LU7 Freehold Limited | Real estate | 2023 |
| Willson Web Design Limited | Extraterritorial | 2013 |
| Wilsher Executive Recruitment Limited | Professional & scientific | 1984 |
| Winamotor.Com Ltd | Professional & scientific | 2024 |
| Windrush Court Limited | Households | 1984 |
| Windrush Court NO. 2 Limited | Households | 1987 |
| Winstanley Construction Limited | Construction | 2022 |
| Wirlygig Limited | Information & communication | 2013 |
| Wise GUY Ltd | Wholesale & retail | 2021 |
| Witchcraft Consulting Limited | Real estate | 2017 |
| WJD Group Ltd | Financial services | 2025 |
| WJF Ecommerce Ltd | Administrative & support | 2021 |
| WL EA Ltd | Real estate | 2025 |
| WM Structures Ltd | Professional & scientific | 2025 |
| Woburn Autos Ltd | Wholesale & retail | 2019 |
| Woburn Building Services Ltd | Construction | 2024 |
| Woburn Carpentry Limited | Construction | 2003 |
| Wolfe Consulting Limited | Information & communication | 2016 |
| Wolfpack Inns Ltd | Hospitality | 2024 |
| Women Window Cleaning Ltd | Extraterritorial | 2021 |
| Wonderbound Ltd | Professional & scientific | 2017 |
| Wonky Table Productions Limited | Information & communication | 2018 |
| Wood Rentals Ltd | Real estate | 2019 |
| Wood&Co Live Entertainment Ltd | Arts & recreation | 2025 |
| Wood&Co Ltd | Construction | 2025 |
| Woodall Evens Ltd | Households | 2021 |
| Woodall Odds Ltd | Households | 2021 |
| Woodcrest Development Ltd | Real estate | 2023 |
| Woodenfish ENG Ltd | Professional & scientific | 2025 |
| Woodgate Mews RTM Company Limited | Households | 2009 |
| Woodland Grange Properties LLP | | 2010 |
| Woodland Warriors Ltd | Education | 2025 |
| Woodland Weddings Limited | Professional & scientific | 2015 |
| Woodlands View (High Wycombe) Residents Association Limited | Households | 1983 |
| Woodview Camping Ltd | Administrative & support | 2018 |
| Woodywoodworks Ltd | Manufacturing | 2024 |
| Woodz Pitstone Ltd | Hospitality | 2026 |
| Woolford Physiotherapy Ltd | Health & social care | 2025 |
| Wowboxme Limited | Wholesale & retail | 2016 |
| WRAPP10 Ltd | Information & communication | 2024 |
| Wren Carpentry Limited | Extraterritorial | 2025 |
| WRS Support Services Limited | Administrative & support | 2020 |
| WTP Holdings Limited | Financial services | 2025 |
| Wycliffe’S Services Limited | Professional & scientific | 2018 |
| Wyllyotts Property Management Ltd | Households | 2026 |
| Wyrd Tree Ltd | Professional & scientific | 2024 |
| Wyvern Shipping Co.Limited(The) | Transport & logistics | 1954 |
| X Fiber Ltd | Construction | 2024 |
| X.S. (UK) Limited | Wholesale & retail | 2014 |
| Xima Invest Ltd | Administrative & support | 2024 |
| Xlusive Limited | Wholesale & retail | 2017 |
| Xpert Immigration Ltd | Administrative & support | 2024 |
| XPO Events Ltd | Administrative & support | 2025 |
| Y & a Design Limited | Wholesale & retail | 2014 |
| Yaleeny Ltd | Wholesale & retail | 2022 |
| Yates Electrical Ltd | Construction | 2019 |
| Yazici Bookkeeping Limited | Professional & scientific | 2021 |
| Yellow Brick Road Therapy Limited | Health & social care | 2020 |
| YES BUT HOW Limited | Information & communication | 2025 |
| YES Chef Catering Limited | Hospitality | 2013 |
| YEW Tree Court RTM Company Limited | Other services | 2012 |
| Yoooreds Property LLP | | 2006 |
| York House Properties Ltd | Real estate | 2023 |
| Young Directors Ltd | Arts & recreation | 2012 |
| Youngs Liquid Waste Limited | Water & waste | 2022 |
| Your Mortgage Cloud Limited | Extraterritorial | 2013 |
| Your Photos Ltd | Professional & scientific | 2019 |
| Youth Sport Summer Camps Ltd | Education | 2024 |
| Yuan Creations Limited | Professional & scientific | 2011 |
| Yumbles Media Ltd | Information & communication | 2013 |
| Z Patel Limited | Wholesale & retail | 2025 |
| Z&A Photography LLP | | 2026 |
| Zabeth Limited | Financial services | 2018 |
| ZAC Thomas Safety Ltd | Professional & scientific | 2025 |
| Zackaton Limited | Administrative & support | 2014 |
| ZAK Solutions Ltd | Wholesale & retail | 2023 |
| Zapcarbon Limited | Professional & scientific | 2012 |
| Zapiq Limited | Manufacturing | 2025 |
| Zara Bray HMU Ltd | Arts & recreation | 2023 |
| Zara Bray Property Ltd | Real estate | 2024 |
| ZDZ Ltd | Real estate | 2026 |
| ZEN & Beyond Retreats Ltd | Administrative & support | 2025 |
| Zenith Cycle Works Ltd | Wholesale & retail | 2025 |
| Zero Carbon Energy Limited | Other services | 2010 |
| Zest for Adventure Limited | Education | 2016 |
| Zeus Financial Services Limited | Financial services | 2018 |
| ZH10 Ltd | Arts & recreation | 2024 |
| ZIP Aviation Company Limited | Manufacturing | 2022 |
| ZJW Investment Ltd | Financial services | 2025 |
| ZOE Filippi Consulting Ltd | Other services | 2007 |
| ZOG Ltd | Construction | 2020 |
| ZOG Office Ltd | Construction | 2020 |
| Zulfaye Ltd | Wholesale & retail | 2021 |
| Zulu Empire Ltd | Health & social care | 2020 |
| Zypho Limited | Wholesale & retail | 2021 |