| Warp Data Centres Ltd | Information & communication | 2023 |
| Wash Water MOT and Service Centre Ltd | Wholesale & retail | 2010 |
| Washingtons Plumbing Heating & Leadwork Limited | Construction | 2010 |
| Waste Topia Ltd | Water & waste | 2024 |
| Water Dispensers UK Ltd | Extraterritorial | 2010 |
| Water Eaton Lane Residents Association Limited | Households | 1999 |
| Water Group Holdings Ltd | Financial services | 2025 |
| Water Leaders | Other services | 2013 |
| Water Pebbles Limited | Households | 2019 |
| Waterfield Technologies UK Limited | Information & communication | 2015 |
| Waterman Project Management Ltd | Professional & scientific | 2009 |
| Watermarq Limited | Information & communication | 2018 |
| Waterpark Heating Limited | Construction | 2022 |
| Waterpride Estates Limited | Real estate | 2018 |
| Waterstock Dressage Limited | Education | 2009 |
| Waterstock Golf Club Limited | Extraterritorial | 1994 |
| Waterways Residents Community Interest Company | Health & social care | 2012 |
| Waterwood Contracts Limited | Construction | 2003 |
| Watson Dobson Consulting Limited | Professional & scientific | 2002 |
| Watson Robinson & Associates Limited | Professional & scientific | 2003 |
| Watts Cooking Ltd | Hospitality | 2025 |
| Watts Medical Ltd. | Health & social care | 2012 |
| Waveweave Ltd | Wholesale & retail | 2025 |
| Waweru Ltd | Health & social care | 2017 |
| Waynelink Limited | Administrative & support | 2025 |
| WE ARE Forge Ltd | Information & communication | 2002 |
| WE Bleed Design Ltd | Professional & scientific | 2016 |
| WE CAN Design Group Ltd | Information & communication | 2020 |
| We-Care-Recruitment Ltd | Health & social care | 2015 |
| We-Care-Recruitment Properties Limited | Real estate | 2022 |
| Wealth Empire Ltd | Financial services | 2018 |
| Wealth Warriors Ltd | Other services | 2021 |
| Weatherden Limited | Professional & scientific | 2014 |
| Webdes UK Ltd | Information & communication | 2004 |
| Webnak Limited | Information & communication | 2013 |
| Weclad Facade Limited | Construction | 2026 |
| Wedding Cars Oxford Ltd | Transport & logistics | 2023 |
| Wedding Doctor Ltd | Information & communication | 2010 |
| Weepro Coders Ltd | Information & communication | 2023 |
| Wefone Limited | Information & communication | 2020 |
| Wegottickets Limited | Professional & scientific | 2004 |
| Weiser & SON Ltd | Other services | 2023 |
| Welcomeguest Lettings Ltd | Households | 2025 |
| Weldale Square Limited | Real estate | 2015 |
| Welkome Home Limited | Real estate | 2025 |
| Wellers Collections Limited | Administrative & support | 2020 |
| Wellers Limited | Professional & scientific | 2026 |
| Wellers Trustees Limited | Administrative & support | 2008 |
| Wellington Court Management (Shipley) Limited | Households | 2009 |
| Wellio Education UK Ltd | Education | 2024 |
| Wellness at the Thames Ltd | Other services | 2025 |
| Wells Developments Ltd. | Construction | 1994 |
| Welmore Limited | Professional & scientific | 2010 |
| Wempowered CIC | Information & communication | 2024 |
| Wenn Robertson Ltd | Extraterritorial | 2004 |
| Wenn Townsend Accountants Limited | Professional & scientific | 2006 |
| Wenn Townsend Consultants Limited | Administrative & support | 1985 |
| Wenn Townsend LLP | | 2025 |
| Wenn Townsend Trustees Limited | Other services | 2024 |
| Wentworth (Butchers) Limited | Real estate | 1961 |
| Wenwenselected Ltd | Wholesale & retail | 2021 |
| Wenze-App Ltd | Wholesale & retail | 2026 |
| Wessex Fertility Limited | Health & social care | 2003 |
| West Acres Holdings Limited | Financial services | 2021 |
| West END Ventures Limited | Hospitality | 2013 |
| West Kendrick Limited | Health & social care | 2022 |
| West Meets East Gardens Ltd | Administrative & support | 2024 |
| Westbrook Farm (Blewbury) Management Company Limited | Real estate | 2022 |
| Westbury Court (Bicester) Management Company Limited | Households | 2016 |
| Westgate Hotel Oxford Limited | Hospitality | 2017 |
| Westmacott Education Ltd. | Education | 2024 |
| Westmead Industrial Estate (Site WS1) Limited | Real estate | 1988 |
| Westmill Limited | Real estate | 2025 |
| Westminster Court (Botley) Management Company Limited | Real estate | 2000 |
| Westminster Developments Limited | Real estate | 2013 |
| Weston Care Professional Ltd | Health & social care | 2022 |
| Westway Place LLP | | 2018 |
| Westwood Systems Limited | Administrative & support | 1989 |
| Weylite Limited | Information & communication | 1999 |
| Weyouchain Technologies Ltd | Information & communication | 2020 |
| Whale Song Live Ltd | Education | 2025 |
| What Martha DID Next C.I.C. | Education | 2022 |
| What Octopus Ltd | Information & communication | 2025 |
| Wheatley Fish and Chips Ltd | Hospitality | 2026 |
| Wheelix Ltd | Transport & logistics | 2024 |
| Whisperer Enterprise Ltd | Information & communication | 2020 |
| Whistletech Ltd | Information & communication | 2025 |
| Whitaker 2002 Limited | Professional & scientific | 2014 |
| Whitaker Media Ltd | Other services | 2017 |
| White & Black Legal LLP | | 2007 |
| White & Black Limited | Professional & scientific | 2007 |
| White City Construction Limited | Construction | 2018 |
| White Hart (Benson) Management Company Limited | Households | 1993 |
| White Hart (Marston) Management Company Limited | Households | 2003 |
| White Hart Business Consultancy UK Ltd | Professional & scientific | 2024 |
| White Hart Community PUB Limited | Hospitality | 2013 |
| White House View Guest House 09 Ltd | Hospitality | 2016 |
| White House View Guest House Ltd | Hospitality | 2016 |
| White Quill Limited | Administrative & support | 2005 |
| White's Properties and Investments Limited | Real estate | 2026 |