| Woet Limited | Real estate | 2019 |
| WOH Gym Ltd | Health & social care | 2024 |
| Wojtus Accountancy Ltd | Professional & scientific | 2022 |
| WOK N Roll (Newport) Ltd | Hospitality | 2022 |
| Wolf Management Services Ltd | Construction | 2024 |
| Wolf Taverns Limited | Hospitality | 2025 |
| Wolloves Ltd | Wholesale & retail | 2025 |
| WOM Recruitment Ltd | Administrative & support | 2022 |
| Woodcote Farming Limited | Agriculture & fishing | 2021 |
| Woodcote Farms Holding Company Limited | Financial services | 2016 |
| Woodland Court (Freshwater) Management Company Limited | Households | 2003 |
| Woodlands Bembridge Maintenance Company Limited | Households | 1982 |
| Woodruff Housing Limited | Real estate | 2023 |
| Woods Consultancy Limited | Information & communication | 2022 |
| Woods Properties Group Limited | Real estate | 2023 |
| Woods Urban Coffee Co. Ltd | Real estate | 2021 |
| Woodside (Northwood) Management Co Limited | Extraterritorial | 1997 |
| Woodside Hogga Products Limited | Manufacturing | 2024 |
| Woodville Catering Limited | Hospitality | 2026 |
| Wooldridge Interiors Ltd | Wholesale & retail | 2019 |
| Wooster Lettings Limited | Real estate | 2026 |
| Wordsmith Cleaning Services Ltd | Administrative & support | 2023 |
| Wordsworth Mansions RTM Company Limited | Households | 2018 |
| Work and Co Stays Ltd | Real estate | 2025 |
| Workforce Outsourcing Limited | Administrative & support | 2022 |
| Workwear Supermarket Ltd | Wholesale & retail | 2019 |
| World of Kitchens Limited | Wholesale & retail | 1997 |
| World State UK Limited | Wholesale & retail | 2021 |
| World Trading Center Limited | Wholesale & retail | 2020 |
| Worldwide Medical Care Associates Ltd | Health & social care | 2021 |
| Worldy Watches Ltd | Wholesale & retail | 2025 |
| Worman Construction Limited | Manufacturing | 1992 |
| Wraithx Group Ltd | Wholesale & retail | 2025 |
| Wray Digital Ltd | Wholesale & retail | 2025 |
| Wrekin Contracting Ltd | Agriculture & fishing | 2025 |
| Wrekin Gymnastics Limited | Education | 2014 |
| Wrekin Wild Game Ltd | Agriculture & fishing | 2025 |
| Wrenchworx Recruitment Ltd | Administrative & support | 2025 |
| Wright Bookkeeping Services Ltd | Professional & scientific | 2018 |
| WRJ Detailing Limited | Wholesale & retail | 2019 |
| WSW Marine Ltd | Manufacturing | 2021 |
| WSW Marine Services Ltd | Manufacturing | 2025 |
| WT Laminates Limited | Wholesale & retail | 2006 |
| WTH Electrical Limited | Construction | 2021 |
| WTS Services Ltd | Education | 2024 |
| WTS Wind Services Ltd | Other services | 2022 |
| Wyatts Construction Limited | Construction | 2012 |
| WYE Heron | Real estate | 2007 |
| Wyld Events Group Limited | Arts & recreation | 2018 |
| Wyld Parties Limited | Arts & recreation | 2019 |
| Wyndford Wagyu Ltd | Agriculture & fishing | 2021 |
| X Autos Ltd | Wholesale & retail | 2023 |
| X Wayz Logistics Ltd | Transport & logistics | 2019 |
| X3I Consulting Limited | Professional & scientific | 2015 |
| Xara & MIA Ltd | Hospitality | 2025 |
| Xclusive Cuts Limited | Other services | 2026 |
| Xeetech Monmouth Limited | Wholesale & retail | 2017 |
| Xenka Ltd | Wholesale & retail | 2020 |
| Xenon Electrical Limited | Construction | 2012 |
| Xframe Fitness Ltd | Arts & recreation | 2025 |
| Xibo Group Ltd | Financial services | 2020 |
| Xibo Marketing Ltd | Administrative & support | 2022 |
| Xibo ST Michael's Ltd | Hospitality | 2020 |
| Xilix Limited | Professional & scientific | 2016 |
| XL KPO Services Ltd | Administrative & support | 2023 |
| XL Travel and Consultancy Limited | Administrative & support | 2024 |
| XMD Group Ltd | Information & communication | 2025 |
| Xnology Ltd | Wholesale & retail | 2018 |
| Xperienplugs Ltd | Manufacturing | 2024 |
| Xplor Events Ltd | Administrative & support | 2023 |
| Xruumz Ltd | Real estate | 2020 |
| XS Electrical Materials Limited | Wholesale & retail | 2004 |
| XU Catering Limited | Hospitality | 2023 |
| Xzan Distribution Ltd | Transport & logistics | 2023 |
| Xzan Tyres Ltd | Wholesale & retail | 2023 |
| Y & S (Risca) Limited | Wholesale & retail | 2012 |
| Y Ddraig Facilities Management Ltd | Construction | 2026 |
| Y Fenni Memorials Newport Ltd | Administrative & support | 2025 |
| Y7 Concept Ltd | Wholesale & retail | 2019 |
| Yacht Sourcer Ltd | Professional & scientific | 2025 |
| Yachtdpa Limited | Professional & scientific | 2021 |
| Yachting Solutions Limited | Wholesale & retail | 2008 |
| Yakky Ltd | Wholesale & retail | 2012 |
| Yara Housing Limited | Real estate | 2025 |
| Yardstick One Limited | Real estate | 2021 |
| Yarmouth Ventures Limited | Professional & scientific | 2012 |
| Yash Foods Ltd | Hospitality | 2025 |
| Yassin Muslim Welfare Ltd | Health & social care | 2024 |
| Yates Holdings and Investments Limited | Financial services | 2021 |
| Ybsi Ltd | Wholesale & retail | 2025 |
| YE Olde Sweet Shoppe Limited | Wholesale & retail | 2016 |
| Yeah Marine Refinishing Ltd | Administrative & support | 2025 |
| Yeet Electrical Services Ltd | Construction | 2019 |
| Yellow Bubble Ltd | Professional & scientific | 2019 |
| Yellow Bunnies Daycare Ltd | Health & social care | 2014 |
| Yellowfont Ltd | Arts & recreation | 2014 |
| Yellowstone Fast Foods (New Inn) Limited | Hospitality | 2020 |
| Yema 4 Ltd | Hospitality | 2025 |
| Yeomans Concierge Limited | Real estate | 2026 |
| Yerrill Business Recovery Ltd | Administrative & support | 2012 |