| Wise UP Limited | Households | 1994 |
| Wiselife International Co., Ltd | Extraterritorial | 2017 |
| Wiser Green Properties Ltd | Construction | 2022 |
| Wishing Globe Limited | Administrative & support | 2022 |
| Wishship Ltd | Information & communication | 2026 |
| Witchford Property Management Company Limited | Households | 2019 |
| Witchpit Ltd | Financial services | 2024 |
| With a Pinch of Salt Limited | Hospitality | 2022 |
| Witham ST Hughs Management Company Limited | Professional & scientific | 2005 |
| Within Planetary Boundaries Studio Ltd | Professional & scientific | 2024 |
| Wittyace UK Holding Limited | Wholesale & retail | 2025 |
| Wixamtree Management Limited | Households | 2024 |
| Wizard Aviation Ltd | Manufacturing | 2024 |
| Wizard Clean Ltd | Administrative & support | 2003 |
| Wizard Workshop Ltd | Manufacturing | 2021 |
| WJ Developments (Cambridge) Ltd | Construction | 2020 |
| WJ Networks Limited | Wholesale & retail | 2016 |
| WJG Media Ltd | Extraterritorial | 2015 |
| WKH Composites Ltd | Manufacturing | 2017 |
| Wksenterprises Ltd | Wholesale & retail | 2023 |
| WMA Property Clean Ltd | Administrative & support | 2026 |
| Wmagri Limited | Administrative & support | 2013 |
| WMP Consulting Ltd | Manufacturing | 2026 |
| Woburn Drive Management Company Limited | Households | 2016 |
| Woha Foods Ltd | Hospitality | 2023 |
| Wokfast Ltd | Hospitality | 2021 |
| Wolearn Ltd | Education | 2014 |
| Wolf and Baller Limited | Wholesale & retail | 2019 |
| Wolf Performance Limited | Manufacturing | 2013 |
| Wolf Performance Racing Ltd | Manufacturing | 2019 |
| Womble Properties Ltd | Real estate | 2022 |
| Women Coding Community CIC | Information & communication | 2025 |
| Women's Wellness Clinic Limited | Health & social care | 2024 |
| Womi Import & Export Co., Limited | Wholesale & retail | 2023 |
| Wonderfeel Limited | Wholesale & retail | 2024 |
| Wonderland Boutique Limited | Wholesale & retail | 2007 |
| Wonky Kitchens Limited | Hospitality | 2025 |
| Wonters FM Limited | Construction | 2001 |
| Wonters Group Holdings Limited | Financial services | 2007 |
| Wood Professional Services and Support Limited | Administrative & support | 2020 |
| Woodditton One LLP | | 2023 |
| Woodford Court Management Company Limited | Households | 2007 |
| Woodland Heights (Bullbridge) Management Company Limited | Households | 2021 |
| Woodland Rise (Langtoft) Management Company Limited | Households | 2022 |
| Woodland Wishes Limited | Other services | 2013 |
| Woodlands END Properties Ltd | Real estate | 2018 |
| Woodlands Park Homes Limited | Hospitality | 2020 |
| Woodoc Europe Limited | Wholesale & retail | 2006 |
| Woodruff & Co Holdings Ltd | Financial services | 2024 |
| Woodruff & Co Ltd | Professional & scientific | 2024 |
| Woodruff Property Cambridge Ltd | Real estate | 2026 |
| Woods Maintenance Ltd | Manufacturing | 2025 |
| Woodsend Wharf Management Company Limited | Households | 2012 |
| Woodventurers Woodland Learning Ltd | Education | 2021 |
| Woodward Solutions Limited | Professional & scientific | 2013 |
| Woof Woof Quack Quack Ltd | Hospitality | 2013 |
| Woolf Institute | Education | 1998 |
| Woolford Properties Holdings Ltd | Financial services | 2025 |
| Woolly Moot Composites Ltd | Manufacturing | 2016 |
| Woolmer Cottage Stables Limited | Other services | 1990 |
| Wootoda Limited | Manufacturing | 2024 |
| Wordmule Limited | Professional & scientific | 2010 |
| Woren Shipping Technology Co., Ltd | Wholesale & retail | 2025 |
| Work-Tops UK & EU Ltd | Wholesale & retail | 2019 |
| Workhy Ltd | Information & communication | 2022 |
| Working ANT Consultancy Cambridge Ltd | Professional & scientific | 2021 |
| Working Drones Limited | Administrative & support | 2024 |
| Workplacebuzz Limited | Information & communication | 2012 |
| WORKSHOP76 Limited | Professional & scientific | 2012 |
| World City Solutions Limited | Education | 2003 |
| World E-Commerce International Group Co., Limited | Wholesale & retail | 2023 |
| World First Certified World Record Co., Limited | Professional & scientific | 2018 |
| World Infant Care Professionals Association | Extraterritorial | 2025 |
| World Internet Force Group Co., Limited | Wholesale & retail | 2023 |
| World Internet Special Forces | Wholesale & retail | 2023 |
| World of Computers Limited | Manufacturing | 1994 |
| World Senior Management Talent & Economy Development League | Extraterritorial | 2008 |
| World Study Solutions Limited | Education | 2002 |
| World Sugar Research Organisation Limited | Professional & scientific | 1978 |
| World Wide Online Services Limited | Other services | 1999 |
| Worldaholics Ltd | Information & communication | 2022 |
| Worldhub Limited | Wholesale & retail | 2023 |
| Worldmodeldata Limited | Information & communication | 2025 |
| Worldwide Solar Ltd | Administrative & support | 2025 |
| Worqs Ltd | Professional & scientific | 2022 |
| Worth Technology Limited | Manufacturing | 2017 |
| Worthgate School Limited | Education | 2007 |
| Worthydeal Limited | Wholesale & retail | 1994 |
| Wovenkord Limited | Information & communication | 2025 |
| Wovex Limited | Professional & scientific | 2013 |
| WOW Cleaning Ltd | Administrative & support | 2023 |
| WOW Global Food Ltd | Manufacturing | 2025 |
| Wozniak Medical Limited | Health & social care | 2021 |
| Wpark Ltd | Administrative & support | 2026 |
| Wpeng Ltd | Wholesale & retail | 2025 |
| Wrapped Architecture Ltd | Construction | 2019 |
| Wraymill Place Residents Management Company Limited | Households | 2010 |
| Wrenbridge (Harlow) LLP | | 2017 |
| Wrenbridge (Harts Farm) Limited | Construction | 1996 |
| Wrenbridge (Hook Hartley) LLP | | 2022 |