| Wildsilk Limited | Wholesale & retail | 2014 |
| Wilkinson Creative & Operations Limited | Arts & recreation | 2026 |
| Wilkinson Music Limited | Information & communication | 2013 |
| Wilkinson Property Management Service Ltd | Real estate | 2024 |
| Will Simons Consultancy Ltd | Professional & scientific | 2023 |
| William Martin Holdings Ltd | Financial services | 2026 |
| Williams Automotive Ltd | Wholesale & retail | 2020 |
| Willow & Puddifoot Limited | Administrative & support | 2019 |
| Willow Holdings (Oxford) Limited | Real estate | 2022 |
| Willow HR Consulting Ltd | Administrative & support | 2016 |
| Willow Ross Ltd | Professional & scientific | 2011 |
| Willow Spring Homes Limited | Construction | 2017 |
| Willowcroft Developments (Oxford) Limited | Construction | 2017 |
| Willson Skeels Consulting Ltd | Professional & scientific | 2025 |
| Wilsham Consulting Ltd | Professional & scientific | 2012 |
| Wilsie Ltd | Professional & scientific | 2026 |
| Wiltshire Physiotherapy Limited | Health & social care | 2025 |
| Wimbush Science & Technology Limited | Manufacturing | 2023 |
| Wincroft Wealth Management Limited | Financial services | 2022 |
| Windmill Capital Limited | Extraterritorial | 2025 |
| WINDOWS2YOU Limited | Construction | 2018 |
| Windrush Commonwealth Service & Arts Centre: Oxon CIC | Information & communication | 2021 |
| Wise Electronics Limited | Manufacturing | 2016 |
| Wise ELF Hospitality Limited | Hospitality | 2017 |
| Wispnet Ltd | Information & communication | 2024 |
| Wisteria Avenue Limited | Other services | 2018 |
| Witu House Limited | Wholesale & retail | 2026 |
| WJB Performance Ltd | Arts & recreation | 2024 |
| WM Recordings Ltd | Information & communication | 2025 |
| WMP Sport Limited | Arts & recreation | 2019 |
| Wochis Ltd | Wholesale & retail | 2025 |
| Women in Ctrl Limited | Other services | 2020 |
| Womp Records Limited | Information & communication | 2015 |
| Woodfield Brady Limited | Professional & scientific | 2008 |
| Woodley Homes Ltd | Real estate | 2021 |
| Woodmount Oxford Limited | Real estate | 2016 |
| Woodwise Kitchens & Interiors Ltd | Manufacturing | 2023 |
| Woodwise Kitchens Ltd | Construction | 2012 |
| Wootton and DRY Sandford Community Centre Ltd | Arts & recreation | 2007 |
| Wootton Trucks Limited | Wholesale & retail | 1978 |
| Workshop Coffee Ventures Ltd | Wholesale & retail | 2023 |
| Workshop Trading (London) Limited | Administrative & support | 2009 |
| Workshop Trading Holdings Limited | Financial services | 2015 |
| Workshop Whitcombe Street Ltd | Hospitality | 2024 |
| Worktop Solutions Oxford Ltd | Manufacturing | 2023 |
| World Endurance Rankings Ltd | Arts & recreation | 2025 |
| World Famous Promotions Limited | Administrative & support | 2003 |
| World Youth Service and Enterprise | Education | 1996 |
| Worsley Creative Services Limited | Professional & scientific | 2018 |
| Wrex Racing Limited | Wholesale & retail | 2009 |
| Wright Field Consulting Ltd | Professional & scientific | 2014 |
| Wstrn Limited | Arts & recreation | 2015 |
| WTM Plumbing Ltd | Construction | 2018 |
| WVL Music Limited | Arts & recreation | 2022 |
| Wylder Estate Limited | Agriculture & fishing | 2023 |
| Wylder Properties Limited | Real estate | 2019 |
| X Quality Ltd | Professional & scientific | 2017 |
| Xantura Limited | Information & communication | 2008 |
| XLE Event Services Ltd | Administrative & support | 2020 |
| XLE Limited | Administrative & support | 2024 |
| Xplosive Events Ltd | Hospitality | 2018 |
| Xplosive Fireworks Ltd | Wholesale & retail | 2018 |
| Xplosive Marketing Limited | Professional & scientific | 2025 |
| Yasin Isbilir Ltd | Wholesale & retail | 2025 |
| Yellow Fighters Limited | Hospitality | 2021 |
| Yellowhammer Electrical Ltd | Construction | 2024 |
| Yeril Ltd | Administrative & support | 2023 |
| Yoctocyotta Ltd | Information & communication | 2018 |
| Youdale Consulting Ltd | Professional & scientific | 2023 |
| Your Car Workshop Ltd | Wholesale & retail | 2025 |
| Your Nans Favourite Rapper Ltd | Hospitality | 2018 |
| Your Ruggy Ltd | Wholesale & retail | 2025 |
| Your Van Centre Ltd | Manufacturing | 2020 |
| Your Vehicle Workshop Ltd | Wholesale & retail | 2024 |
| Yser Consulting Ltd | Professional & scientific | 2025 |
| Zak&Nomi Limited | Hospitality | 2019 |
| Zapvend Ltd | Wholesale & retail | 2025 |
| Zeher Digital Solutions Ltd | Information & communication | 2016 |
| ZEN Body Fitness Ltd | Education | 2019 |
| Zenixspace Ltd | Construction | 2021 |
| Zenn Events Limited | Construction | 2013 |
| ZEP Bilisim & AI Otomasyon Ltd | Wholesale & retail | 2025 |
| Zero Technology Solar Ltd | Energy | 2011 |
| Zeroperio Ltd | Other services | 2022 |
| Zesty Lemon Visuals Ltd | Information & communication | 2023 |
| Zestylemonengineering Ltd | Professional & scientific | 2025 |
| Zeus Dynamics Limited | Wholesale & retail | 2025 |
| ZL Sports Infinity Ltd | Education | 2021 |
| Zuma BIO Limited | Professional & scientific | 2024 |
| Zyvo Digital Ltd | Wholesale & retail | 2026 |