| Woodside Estates Limited | Real estate | 2007 |
| Woodstock Butchers Ltd | Extraterritorial | 2021 |
| Woodstock Close Residents Association Limited | Households | 1968 |
| Woodstock Court Management Limited | Households | 1994 |
| Woodstock East LLP | | 2018 |
| Woodstock Grocers Ltd | Extraterritorial | 2021 |
| Woodstock Lodge (Oxford) Management Company Limited | Households | 2005 |
| Woodstock Lodge (Oxford) NO.2 Management Company Limited | Households | 2015 |
| Woodstock Road Ltd | Households | 2002 |
| Woodstock Shops Ltd | Wholesale & retail | 2020 |
| Woodville Mews Limited | Construction | 2012 |
| Woof and Whistle Limited | Other services | 2016 |
| Woolmer Hill Property Company Limited | | 1960 |
| Wootton Road Properties Limited | Real estate | 2015 |
| Worcester Leisure Ltd | Hospitality | 2012 |
| Word Fountain Christian Ministries Limited | Education | 2003 |
| Word of Mouth Games Ltd | Information & communication | 2022 |
| Working Communities Limited | Administrative & support | 2001 |
| World Connect (UK) Ltd | Administrative & support | 2003 |
| World Food Group Ltd | Wholesale & retail | 2021 |
| World Junior Sports Ltd | Arts & recreation | 2019 |
| World Wellbeing Movement Ltd | Professional & scientific | 2021 |
| World Wine Tours Limited | Extraterritorial | 1985 |
| Worldmapper Limited | Professional & scientific | 2014 |
| Worthy Earth Festival Limited | Hospitality | 2024 |
| Worton LLP | | 2015 |
| Woven INK Studio Ltd | Information & communication | 2017 |
| Woxford Environmental Technologies (UK) Ltd. | Professional & scientific | 2014 |
| WP Auto Ltd | Wholesale & retail | 2020 |
| WP1 OX Design Limited | Construction | 2016 |
| WPN Stone Installation Ltd | Manufacturing | 2016 |
| WPR Construction Limited | Households | 2025 |
| Wqlamu Ltd | Hospitality | 2026 |
| WR Sports Limited | Education | 2018 |
| Wrather Fisk Limited | Professional & scientific | 2022 |
| Wren Bookings Limited | Information & communication | 2017 |
| Wrens of Thame Ltd | Wholesale & retail | 2011 |
| Wrss Enterprises Ltd | Information & communication | 2018 |
| Wsjd Propertys Ltd | Real estate | 2025 |
| WT Annuitants Limited | Administrative & support | 2025 |
| WT Temp Limited | Extraterritorial | 2010 |
| WT1 Ltd | Professional & scientific | 2026 |
| WTI Advisors Ltd | Professional & scientific | 2005 |
| Wtl-Ejola Ltd | Transport & logistics | 2012 |
| WU Kong Ltd | Hospitality | 2019 |
| Wwish Limited | Wholesale & retail | 2024 |
| Wyatt Bros. (Oxford) Limited | Arts & recreation | 1972 |
| Wychwood Boarding (Oxford) Limited | Administrative & support | 2026 |
| Wychwood Court (Oxford) Limited | Real estate | 2016 |
| Wychwood Hurst Medical Limited | Health & social care | 2023 |
| Wychwood School (Oxford) Limited | Education | 2020 |
| Wycliffe Associates Ltd. | Extraterritorial | 2020 |
| Wycliffe Bible Translators Ltd. | Extraterritorial | 2005 |
| Wycliffe Hall | Education | 2014 |
| Wycliffe Hall Development Ltd | Education | 2017 |
| Wycliffe Hall Services Limited | Hospitality | 2013 |
| Wycliffe Ltd | Extraterritorial | 2026 |
| Wycliffe UK Ltd. | Other services | 1964 |
| Wytham Developments Limited | Real estate | 1994 |
| Wytham View Management Company Limited | Administrative & support | 2005 |
| Xbrl UK Limited | Information & communication | 2003 |
| Xcharta Limited | Information & communication | 2022 |
| XDS Oxford Limited | Manufacturing | 2001 |
| Xeiantagos Ltd | Transport & logistics | 2019 |
| Xendurance Europe Limited | Wholesale & retail | 2014 |
| Xeqos Limited | Financial services | 2018 |
| Xeromotorbikes Ltd | Wholesale & retail | 2022 |
| Xincheng Industrial Co. Ltd | Wholesale & retail | 2020 |
| XIT Services Limited | Information & communication | 2007 |
| XK Engineers Limited | Construction | 2022 |
| Xmass Limited | Financial services | 2023 |
| XPD8 Consulting Ltd | Information & communication | 2017 |
| XPE Limited | Professional & scientific | 2012 |
| XPE Properties Limited | Real estate | 2024 |
| Xpertcopia Ltd | Other services | 2010 |
| Xrystalmed (Oxford) Ltd | Manufacturing | 2025 |
| Xtech IT Limited | Information & communication | 2020 |
| Xtreme Motors Limited | Wholesale & retail | 2023 |
| Xvii International Limited | Professional & scientific | 2017 |
| XWG Ltd | Information & communication | 2021 |
| Xyme Limited | Professional & scientific | 2024 |
| Xzyab Ltd | Hospitality | 2018 |
| Y Vallis Limited | Health & social care | 2006 |
| Y&S Property Management Company Ltd | Real estate | 2026 |
| Y3S Design & Build Limited | Construction | 2023 |
| Y3S Estates Ltd | Real estate | 2023 |
| Y3S Lettings Ltd | Real estate | 2025 |
| Yagmap Ltd | Administrative & support | 2012 |
| Yair Energy Limited | Professional & scientific | 2018 |
| Yakka Ltd | Construction | 2025 |
| Yang's Limited | Education | 2011 |
| Yangtze Global Ltd | Wholesale & retail | 2024 |
| Yangtze Limited | Hospitality | 2013 |
| Yanis Automotive Ltd | Wholesale & retail | 2023 |
| Yardi Payments Limited | Professional & scientific | 2019 |
| Yardi Systems Limited | Information & communication | 2003 |
| Yarkam Limited | Hospitality | 2014 |
| Yasmeenah Limited | Public administration | 2023 |
| Yava Group Ltd | Hospitality | 2014 |
| Yawn Ltd | Information & communication | 2026 |