| WCO Courier Service Limited | Transport & logistics | 2026 |
| WE ARE Mary's Ltd | Other services | 2026 |
| WE ARE TAS Ltd | Hospitality | 2017 |
| Weather Accountancy Ltd | Professional & scientific | 2017 |
| Website Energizers Ltd | Information & communication | 2008 |
| Wedda Buildmaster Ltd | Construction | 2024 |
| Weft Limited | Information & communication | 2024 |
| Weird Creatures Limited | Wholesale & retail | 2019 |
| Weld Fabrications Ltd | Construction | 2019 |
| Weljadd Property Limited | Financial services | 2020 |
| Well Day Limited | Manufacturing | 2024 |
| Wellness at New Street Ltd | Health & social care | 2022 |
| Wellsbeing Ltd | Health & social care | 2012 |
| Welltech Limited | Manufacturing | 2020 |
| Wenman Ltd | Professional & scientific | 2010 |
| West Bar Street Management Limited | Households | 2013 |
| West Bar Veterinary Hospital Ltd | Professional & scientific | 2014 |
| West Bay Park Homes Limited | Hospitality | 2024 |
| West Lighting Solutions Ltd | Manufacturing | 2022 |
| West Lodge Rural Centre Limited | Education | 2015 |
| Westbury Heath Limited | Financial services | 2025 |
| Westcot Lighting Limited | Professional & scientific | 2014 |
| Westcott Consultancy Limited | Professional & scientific | 2012 |
| Westhorpe Fields Management Company Limited | Professional & scientific | 2003 |
| Westminster Aviation Security Services Limited | Administrative & support | 2000 |
| Westminster Cyber & Defence Technologies Limited | Administrative & support | 2003 |
| Westminster Global Services Limited | Administrative & support | 2006 |
| Westminster Group PLC | Professional & scientific | 2000 |
| Westminster International Limited | Administrative & support | 2000 |
| Westminster Maritime Services Ltd | Transport & logistics | 2004 |
| Westminster Operating Limited | Administrative & support | 2013 |
| Westminster Services Limited | Administrative & support | 2005 |
| Weston Vets Ltd | Professional & scientific | 2026 |
| Westpoint Television Limited | Information & communication | 2018 |
| Wetherley Consulting Limited | Professional & scientific | 2016 |
| Weucart Limited | Wholesale & retail | 2025 |
| Whap Ltd | Information & communication | 2021 |
| Wheellab Limited | Professional & scientific | 2017 |
| White Rabbit Events Ltd | Other services | 2013 |
| White Rabbit Planning Services Limited | Other services | 2023 |
| Whiteberry Belport Carry LLP | | 2023 |
| Whitley Stimpson Limited | Professional & scientific | 2014 |
| Whole Hearth Ltd | Professional & scientific | 2025 |
| Whoozle Creative Ltd | Professional & scientific | 2023 |
| WHY Investment Management Limited | Real estate | 2017 |
| Wigwam Property Ltd | Real estate | 2021 |
| Wilbo's Blends Limited | Manufacturing | 2021 |
| Wilbo’S Blends Holdings Limited | Financial services | 2024 |
| Wilby IT Limited | Information & communication | 2016 |
| Wild Property Consultancy Limited | Real estate | 2008 |
| Will Dendy Racing Ltd | Education | 2021 |
| Will Films Limited | Information & communication | 2010 |
| Will Marr & Co Ltd | Professional & scientific | 2019 |
| Willclaim Ltd | Administrative & support | 2005 |
| William Green Architects Limited | Professional & scientific | 2014 |
| Willow Saplings Ltd | Agriculture & fishing | 2015 |
| Wills Business Solutions Ltd | Professional & scientific | 2024 |
| Wills Recruitment and Training Ltd | Administrative & support | 2024 |
| Wilscot Management Limited | Real estate | 2026 |
| Wilson Moore Professional Cleaning Ltd | Administrative & support | 2021 |
| Wine Collector Limited | Wholesale & retail | 2023 |
| Winology Software Limited | Information & communication | 1998 |
| Wintershill Consultancy Limited | Professional & scientific | 2003 |
| WIRED4TECH Ltd | Professional & scientific | 2019 |
| Wireless Pro Ltd | Information & communication | 2019 |
| Wise Geary Limited | Professional & scientific | 2014 |
| Without a Padel Ltd | Arts & recreation | 2025 |
| Witney Travel Limited | Real estate | 1993 |
| WJ Automotive Ltd | Wholesale & retail | 2025 |
| WJD Properties UK Limited | Financial services | 2012 |
| WM Millennium Engineering Solutions Limited | Manufacturing | 2024 |
| WM Properties Investment Group Ltd | Real estate | 2026 |
| WMG Brand Ltd | Other services | 2025 |
| Wobls Ltd | Wholesale & retail | 2023 |
| Wobmf Nominees Ltd | Extraterritorial | 2025 |
| WOK4WALK Limited | Hospitality | 2020 |
| Wolfys Workshop Ltd | Manufacturing | 2023 |
| Wollaston Rose Architects Ltd | Professional & scientific | 2021 |
| Wolverine Consulting Ltd | Information & communication | 2018 |
| Woodland Park Limited | Real estate | 2015 |
| Woodstock Bridge Ltd | Real estate | 2015 |
| Woodston Limited | Financial services | 2021 |
| Woolstone Developments Limited | Construction | 2013 |
| Work Area Limited | Wholesale & retail | 2010 |
| Work in Progress Creative Solutions Limited | Information & communication | 2001 |
| Work Well Mats Limited | Wholesale & retail | 2013 |
| Workshop Heaven Ltd | Agriculture & fishing | 2007 |
| World Wilde Ltd | Information & communication | 2016 |
| WORLD99 Limited | Transport & logistics | 2023 |
| Wosa Limited | Professional & scientific | 2010 |
| Wotify Limited | Information & communication | 2021 |
| Wrap and Paint Ltd | Wholesale & retail | 2019 |
| Wrap Enterprises Ltd. | Professional & scientific | 2001 |
| Wrathall Consulting Ltd | Professional & scientific | 2021 |
| WRG Properties Limited | Real estate | 2019 |
| Wright & Co Holdings Limited | Financial services | 2025 |
| Wright Estate Management Ltd | Construction | 2022 |
| Wroxton College Educational Services Ltd | Education | 2025 |
| WRS Services Banbury Limited | Transport & logistics | 2018 |
| WS Payroll Services LLP | | 2022 |