| Whitewater Homes Ltd | Real estate | 2025 |
| Whittaker Investing Limited | Real estate | 2024 |
| Whittlesea Grab Hire Ltd | Transport & logistics | 2023 |
| Whittlesea Independent Funeral Services Ltd | Other services | 2014 |
| Whittlesey Animal Care Limited | Professional & scientific | 2025 |
| Whittlesey Bathroom and Kitchen Studio Ltd. | Wholesale & retail | 2003 |
| Whittlesey Car Sales Limited | Wholesale & retail | 2025 |
| Whittlesey Community Hub Limited | Arts & recreation | 2019 |
| Whittlesey Engineering Company Limited | Manufacturing | 1970 |
| Whittlesey Fruits & Vapes Mini Market Ltd | Wholesale & retail | 2026 |
| Whittlesey Indoor Bowls and Sports Complex Limited | Arts & recreation | 2001 |
| Whittlesey Insurance Services Limited | Financial services | 1987 |
| Whittlesey Nails Ltd | Other services | 2026 |
| Whittlesey Properties Limited | Real estate | 2013 |
| Whittlesey Removals UK Limited | Transport & logistics | 2010 |
| Whittlesey Self Store Ltd | Transport & logistics | 2017 |
| Whittlesey Travel Limited | Administrative & support | 2010 |
| Whizbiz Ltd | Wholesale & retail | 2024 |
| Whole Installations Limited | Construction | 2024 |
| Wholesale Communications Limited | Transport & logistics | 2003 |
| Wholesome Care Services Ltd | Health & social care | 2026 |
| Whoop! Co Ltd | Manufacturing | 2025 |
| Whoosdis Ltd | Wholesale & retail | 2024 |
| WIA Global Limited | Water & waste | 2010 |
| WIA International Ltd | Water & waste | 2024 |
| Wickes Associates Ltd | Professional & scientific | 2011 |
| Widapa Limited | Water & waste | 2012 |
| Wider Vision Ltd | Professional & scientific | 2001 |
| Widestripe Engineering (UK) Services Ltd | Professional & scientific | 1998 |
| Widlake Ltd | Administrative & support | 2025 |
| Widows ROW Enterprise Ltd | Real estate | 2026 |
| Wielton Africa Ltd | Professional & scientific | 1977 |
| Wiggle IT Wigs Ltd | Wholesale & retail | 2019 |
| Wiggles & Giggles Day Nursery Ltd | Health & social care | 2016 |
| Wigsthorpe Farms Limited | Agriculture & fishing | 1976 |
| Wik-Pol Refurbishment Ltd | Construction | 2026 |
| Wiki Builders Ltd | Construction | 2021 |
| Wikiconnections Limited | Administrative & support | 2016 |
| Wiktorias Hair Ltd | Other services | 2015 |
| Wil-Rig Limited | Information & communication | 2024 |
| Wilaade Care Aylesbury Limited | Health & social care | 2024 |
| Wilcox Commercial Vehicles Limited | Manufacturing | 2000 |
| Wilcox Group Limited | Manufacturing | 2019 |
| Wilcox Tippers Limited | Construction | 2001 |
| Wild Collective CIC | Wholesale & retail | 2020 |
| Wild Parrot Digital Ltd | Information & communication | 2024 |
| Wild Women Retreats Ltd | Arts & recreation | 2025 |
| Wildermorph Ltd | Education | 2026 |
| Wilderness House Conservation Ltd | Construction | 2021 |
| Wildflower Guild Ltd | Real estate | 2024 |
| Wildflower Real Estate Limited | Professional & scientific | 2024 |
| Wildflowers Craft and Coffee House Ltd | Hospitality | 2024 |
| Wildlife Travel Limited | Administrative & support | 1988 |
| Wildmore Enterprises Limited | Professional & scientific | 2024 |
| Wildside TCB Limited | Construction | 2017 |
| Wiles Developments Limited | Financial services | 2022 |
| Wilkinson Accounting Solutions Holdings Limited | Financial services | 2023 |
| Wilkinson Accounting Solutions Limited | Professional & scientific | 2019 |
| Wilkinson Homes Limited | Real estate | 2025 |
| Will & Sons Couriers Ltd | Other services | 2021 |
| Will GUY Electrical Limited | Construction | 2008 |
| Will YOU Buy My Car.Com Limited | Wholesale & retail | 2013 |
| William Cooke Homes Ltd | Construction | 2023 |
| William George Camera and Engineering Limited | Professional & scientific | 2017 |
| William James Catering Ltd | Hospitality | 2023 |
| William Nichols Court Management Company Limited | Households | 1987 |
| William Scarlett Holdings Limited | Real estate | 2021 |
| Williams and Lawrence Limited | Hospitality | 2016 |
| Williams Distributors Ltd | Wholesale & retail | 2016 |
| Williamson Site Services Ltd | Professional & scientific | 2025 |
| Willow & Grace Bridal Limited | Wholesale & retail | 2017 |
| Willow Drove Limited | Wholesale & retail | 2025 |
| Willow Heights Residents Management Company Limited | Households | 2019 |
| Willow Property Maintenance Ltd | Construction | 2019 |
| Willow Road (Ambrosden) Residents Company Limited | Households | 2002 |
| Willow Tree Reborns Ltd | Extraterritorial | 2021 |
| Willow Tree Services Lincs Limited | Administrative & support | 2011 |
| Willowbrook Kitchens Limited | Manufacturing | 2014 |
| Willowfen Care Limited | Health & social care | 2024 |
| Willowhaven Stays Ltd | Real estate | 2025 |
| Wilmaoraa Limited | Health & social care | 2018 |
| Wilo Care Providers Ltd | Health & social care | 2022 |
| Wilsco Prime Limited | Wholesale & retail | 2025 |
| Wilson & Co Homes Ltd | Real estate | 2013 |
| Wilson & Co Mortgage Services Ltd | Financial services | 2019 |
| Wilson Academia Ltd | Education | 2023 |
| Wilson Consultancy Strategic Solutions Limited | Professional & scientific | 2024 |
| Wilson Properties Limited | Real estate | 1986 |
| Wilsoncare Limited | Health & social care | 2023 |
| Wilsons Asphalt Technologies Ltd | Other services | 2021 |
| Wilsons Concrete Technologies Ltd | Other services | 2021 |
| Wilteg Enterprises Company Ltd | Transport & logistics | 2018 |
| Wimbish Residents Company Limited | Households | 2002 |
| Wimpole Industrial Finance Company Limited | Real estate | 1958 |
| Winch Serviced Accommodations Ltd | Hospitality | 2021 |
| Wincos Housing Ltd | Real estate | 2024 |
| Wincos Ltd | Professional & scientific | 2022 |
| Windguard Ltd | Professional & scientific | 2025 |
| Windmill Motors Limited | Wholesale & retail | 2004 |
| Windmill Property Investments Cambs Limited | Real estate | 2020 |