| W Lambourne Agricultural Services Ltd | Agriculture & fishing | 2018 |
| W. J. Bussell Building Services Limited | Construction | 2003 |
| W.S Paving and Groundwork Ltd | Construction | 2026 |
| W4 Bathrooms & Heating Supplies Limited | Wholesale & retail | 2004 |
| WAC Group Limited | Information & communication | 2024 |
| Waddesdon Services Limited | Professional & scientific | 2011 |
| Walter Property Services Ltd | Manufacturing | 2019 |
| Wander of UKE Ltd | Arts & recreation | 2024 |
| Watcai Consulting Limited | Information & communication | 2006 |
| Watford Signs Limited | Manufacturing | 2010 |
| Watson Self Storage Ltd | Administrative & support | 2021 |
| Waveplane Consulting Limited | Professional & scientific | 2003 |
| Wealth Arena Limited | Transport & logistics | 2025 |
| Weaving Webs Limited | Information & communication | 1999 |
| Webclick Limited | Professional & scientific | 2003 |
| Webster Collins Ltd | Health & social care | 2025 |
| Wedgewood Britain Ltd | Administrative & support | 2020 |
| Weights Limited | Manufacturing | 2003 |
| Wellhead Limited | Professional & scientific | 2006 |
| Wemyss.Design Limited | Professional & scientific | 2023 |
| Werks Engineering Ltd | Manufacturing | 2026 |
| Wespall Consulting Ltd | Information & communication | 2011 |
| West Bay Solutions Ltd | Professional & scientific | 2026 |
| West Bond Holdings Ltd | Real estate | 2020 |
| West END Garage (Buckingham) Limited | Wholesale & retail | 2005 |
| Westbury Park View Management Co. Ltd | Other services | 2025 |
| Wheeldon Estates Limited | Construction | 1972 |
| Wheelie Good Cleaning Services Ltd | Administrative & support | 2025 |
| White Angels Care Ltd | Health & social care | 2020 |
| White HEN Electrical Services Limited | Manufacturing | 2004 |
| Wholepal Ltd | Information & communication | 2022 |
| Wicks Agri Ltd | Construction | 2019 |
| Wilcon Limited | Professional & scientific | 2024 |
| Wild Rose Flower (Trading) Company Ltd | Wholesale & retail | 2018 |
| Wild Sage Events Ltd | Hospitality | 2015 |
| Wildon Painting Services Limited | Construction | 2023 |
| Wildsmith Productions Limited | Professional & scientific | 2013 |
| Wilks Retail Ltd | Wholesale & retail | 2010 |
| Will Beck Furniture Limited | Manufacturing | 2017 |
| Will Daniels Performance Engineering Ltd | Professional & scientific | 2021 |
| Will Field Design Ltd | Information & communication | 2014 |
| Will Power Events Ltd | Arts & recreation | 2025 |
| William Flux Antiques Limited | Wholesale & retail | 2017 |
| Willinspire Limited | Other services | 2003 |
| Willow Living Limited | Manufacturing | 2017 |
| Winchester House Trading Limited | Hospitality | 2013 |
| Windmill Road (Thame) Limited | Households | 2006 |
| Winslow and District Community BUS | Administrative & support | 1999 |
| Winslow Bullion Ltd | Wholesale & retail | 2024 |
| Winslow Catering Limited | Hospitality | 2005 |
| Winslow Construction Limited | Construction | 2023 |
| Winslow Dental Practice Ltd | Health & social care | 2014 |
| Winslow Grill Ltd | Hospitality | 2025 |
| Winslow IT Consultancy Limited | Information & communication | 2015 |
| Winslow Masters Lodge Limited | Households | 2003 |
| Winslow Restaurants Ltd | Hospitality | 2014 |
| Winslow Skin and Aesthetics Ltd | Other services | 2023 |
| Winters Tale Country Barn Ltd | Hospitality | 2018 |
| Winwood Construction (UK) Ltd | Construction | 2010 |
| Wipac Technology Limited | Manufacturing | 2019 |
| Wisdom BPO Ltd | Information & communication | 2019 |
| Wise Safety Ltd | Wholesale & retail | 2010 |
| Wise Words Consultancy Limited | Professional & scientific | 2023 |
| Wishing Well Holistic Therapies Limited | Health & social care | 2003 |
| Witchology Ltd | Information & communication | 2021 |
| Withnell Ltd | Administrative & support | 2015 |
| Witney Chiropractic Clinic Limited | Health & social care | 2006 |
| Wizard Vizuals Ltd | Professional & scientific | 2023 |
| Wldn Ltd | Health & social care | 2025 |
| WNDR-B2B Ltd | Administrative & support | 2025 |
| Wolfe Ltd | Wholesale & retail | 2019 |
| Wonky Corner Healing Ltd | Wholesale & retail | 2025 |
| Wood Farm Capital Ltd | Financial services | 2023 |
| Wood Farm Investments Ltd | Professional & scientific | 2019 |
| Woodland Baines Ltd | Administrative & support | 2024 |
| Woodlands Financial Management Limited | Financial services | 2023 |
| Woof Times Ltd | Other services | 2019 |
| Woolly Woods Ltd | Administrative & support | 2022 |
| Woolpack Buckingham Ltd | Hospitality | 2024 |
| Wordsthruthetrees Ltd | Professional & scientific | 2023 |
| Workwear Bespoke Limited | Extraterritorial | 2021 |
| World of Wood (Buckingham) Limited | Wholesale & retail | 2003 |
| Worldwide Domain Services Ltd | Information & communication | 2019 |
| Worldwide Group Logistics Ltd | Transport & logistics | 2018 |
| Wovern Property Developments Ltd | Real estate | 2024 |
| WP ADR Consulting Ltd | Professional & scientific | 2023 |
| Writetax Consultancy Services Ltd | Professional & scientific | 2010 |
| Wroxton Management Limited | Professional & scientific | 2005 |
| Wyze-Antz Ltd | Construction | 2026 |
| Xanadu Holdings Limited | Real estate | 2001 |
| Xcel Integrated Services Ltd | Construction | 2025 |
| XP Education and Technologies Ltd | Information & communication | 2025 |
| Xtwineye Limited | Information & communication | 2024 |
| Yawway Ltd | Manufacturing | 2024 |
| Yekalb Ltd | Information & communication | 2023 |
| Yellow Brimstone Limited | Extraterritorial | 2024 |
| Yellow Cube Limited | Real estate | 2024 |
| Yeoman Associates Ltd | Professional & scientific | 2026 |
| YES WE Work Ltd | Information & communication | 2014 |
| YEW Tree Motorworks Limited | Wholesale & retail | 1977 |