| Waterworx Plumbing and Heating Services Limited | Construction | 2017 |
| WDK Security Limited | Administrative & support | 2019 |
| Wearebluem Ltd | Wholesale & retail | 2023 |
| Weimaraner Limited | Professional & scientific | 2018 |
| Welcome Feast Limited | Hospitality | 2025 |
| Welcome Restaurant Limited | Administrative & support | 2026 |
| Wellington Wise Independent Estate Agents Limited | Real estate | 2005 |
| Wellingtonwise Letting Agents Ltd | Extraterritorial | 2013 |
| Wennyroad Management Limited | Real estate | 2016 |
| Westcott Investments Limited | Administrative & support | 2012 |
| Westcott Real Estate Limited | Real estate | 2023 |
| Westcott Surveyors Limited | Professional & scientific | 2014 |
| Westwoods Corner Ltd | Hospitality | 2024 |
| WH UK Business Services Ltd | Administrative & support | 2025 |
| Wharf House (ST Ives) Limited | Real estate | 1957 |
| Wheeler Medical Services Ltd | Health & social care | 2024 |
| Wheels in Wheels Events Limited | Arts & recreation | 2009 |
| Wheels Motorcycles Holdings Limited | Financial services | 2019 |
| Wheels Motorcycles Limited | Extraterritorial | 2019 |
| White Peaks and Partners Ltd | Information & communication | 2025 |
| White Plumbing Limited | Construction | 2007 |
| White Roses Holiday Retreat Ltd | Hospitality | 2021 |
| Whitewater Design Services Ltd | Professional & scientific | 2019 |
| Whitsey Developments Limited | Construction | 2023 |
| Wiki Properties Ltd | Real estate | 2021 |
| Wiki Windows Limited | Manufacturing | 2018 |
| Wild Together Ltd | Wholesale & retail | 2025 |
| Wildcard Advisors Ltd | Professional & scientific | 2024 |
| Wilson Heating and Plumbing Limited | Construction | 2022 |
| Wimbledon and Tudor Consultants Limited | Professional & scientific | 2014 |
| Windover Court Property Management Limited | Administrative & support | 2010 |
| Wise Mortgage Advice Ltd | Financial services | 2018 |
| Wiser Environment Limited | Professional & scientific | 2003 |
| Wiser Limited | Extraterritorial | 2005 |
| Wiser Waste Information Services Limited | Professional & scientific | 2009 |
| Wiser Weee Limited | Professional & scientific | 2010 |
| Wodskou Properties Limited | Real estate | 2009 |
| Wonham Ltd | Administrative & support | 2015 |
| Wood Farm Livery Limited | Agriculture & fishing | 2011 |
| Woodgate Developments Holdings UK Ltd | Construction | 2024 |
| Woodgate Developments Limited | Construction | 2014 |
| Woodgate Road Management Limited | Construction | 2022 |
| Work Safe (Cambs) Ltd | Administrative & support | 2012 |
| Workmate Media Limited | Construction | 2024 |
| World With Horses Ltd | Wholesale & retail | 2025 |
| Worldnet Telecommunication Services Limited | Information & communication | 2013 |
| Woven Creative Limited | Information & communication | 2021 |
| WPH Solutions Ltd | Construction | 2022 |
| WR Davies Cardiology Limited | Health & social care | 2016 |
| Wright Sheet Metal Ltd | Manufacturing | 2022 |
| WS Realtime Ltd | Real estate | 2020 |
| Xpress Datacom Supplies Ltd | Wholesale & retail | 2020 |
| Xyntax Control Systems Limited | Manufacturing | 2003 |
| Yelton Holdings Limited | Financial services | 2020 |
| YN Kessenyans Ltd | Construction | 2023 |
| Young World Lettings Limited | Real estate | 2016 |
| Young World Property Limited | Real estate | 2016 |
| Young's Coaches Ltd | Transport & logistics | 2023 |
| Yourbrandhero Ltd | Other services | 2015 |
| Z Cars (ST Ives) Ltd | Transport & logistics | 2018 |
| Zalio Ltd | Information & communication | 2025 |
| Zaptix Energy Limited | Energy | 2025 |
| Zeeko Innovations Limited | Extraterritorial | 2012 |
| Zenkai Automotive Ltd | Wholesale & retail | 2025 |
| Zentian Limited | Information & communication | 2000 |
| Ziba Aesthetics Ltd | Other services | 2025 |
| Zipah Limited | Information & communication | 2019 |
| Zircon Corporation Limited | Wholesale & retail | 2017 |
| Zzohanna Ltd | Hospitality | 2017 |