| Wicked Uncle Limited | Extraterritorial | 2014 |
| Wicken LEA (Newport) Management Company Limited | Households | 2017 |
| Wickford Chiropractic Clinic Limited | Health & social care | 2004 |
| Wickham Hall Solar Battery Limited | Real estate | 2022 |
| Widebeam Limited | Information & communication | 2011 |
| Widescreen Audio Limited | Arts & recreation | 2012 |
| Widescreen Music Limited | Arts & recreation | 2012 |
| WIETRICHP116.ENGINEERING Ltd | Manufacturing | 2026 |
| Wiggit Ltd | Wholesale & retail | 2014 |
| Wigland Limited | Construction | 1992 |
| Wiivvo Ltd | Wholesale & retail | 2011 |
| Wilburton Associates Limited | Administrative & support | 2015 |
| Wild at Art Workshops Ltd | Arts & recreation | 2016 |
| Wild at Heart Yoga Limited | Other services | 2020 |
| Wild Bikers Limited | Administrative & support | 2025 |
| Wild Blossom Consultancy & Retreats Ltd | Professional & scientific | 2016 |
| Wild Child Media Ltd | Information & communication | 2026 |
| Wild Lives Earth Limited | Other services | 2025 |
| Wild Wood Events Limited | Arts & recreation | 2018 |
| Wildcat Acquisition Holdings (UK) Limited | Financial services | 2011 |
| Wilde Wiring Limited | Extraterritorial | 2023 |
| Wildstems Limited | Wholesale & retail | 2017 |
| Wilkinson's of Shelford Limited | Wholesale & retail | 2009 |
| Will Foote Consulting Limited | Professional & scientific | 2025 |
| Willau Ltd | Professional & scientific | 2020 |
| Willers & Sons Limited | Construction | 2019 |
| William Henry Property Ltd | Real estate | 2023 |
| William James Restaurants Limited | Hospitality | 2018 |
| William MAY Ltd | Real estate | 2021 |
| William Orme Consulting Ltd | Professional & scientific | 2019 |
| William Smith Close Freehold Limited | Households | 2019 |
| William Winter Ltd | Construction | 2024 |
| Williams Barnes Investments Limited | Financial services | 2024 |
| Willie Musson Racing Ltd | Arts & recreation | 2008 |
| Willingham Auctions Limited | Wholesale & retail | 2002 |
| Willingham Gym & Wellness Ltd | Arts & recreation | 2019 |
| Willingham Health Care Limited | Health & social care | 1995 |
| Willingham News Limited | Information & communication | 2015 |
| Willow & Dune Ltd | Construction | 2025 |
| Willow Terrace Management | Real estate | 2025 |
| Willowbrook (Lodge END) Management Company Limited | Households | 2021 |
| Willowcroft (SM) Management Company Limited | Households | 2009 |
| Willows Ventures Ltd. | Information & communication | 2014 |
| Wilma Studios Limited | Professional & scientific | 2009 |
| Wilmed Consulting Limited | Professional & scientific | 2025 |
| Wilpak Group International UK Limited | Administrative & support | 2024 |
| Wilsher Management Company Limited | Real estate | 2024 |
| Wilson Langley Homes Ltd | Construction | 2021 |
| Wilson-Mottaz Property Limited | Real estate | 2003 |
| Wilsonparker Limited | Health & social care | 2005 |
| Wilsons of Cambridge Ltd | Professional & scientific | 2016 |
| Wilton Payments Limited | Financial services | 2004 |
| Wimpole Associates Limited | Hospitality | 2007 |
| Wimpole Bookkeeping & Accounting Ltd | Professional & scientific | 2020 |
| Winchestergs Ltd | Arts & recreation | 2025 |
| Wind Pioneers Engineering Ltd | Professional & scientific | 2016 |
| Wind Rose Yacht Carpentry Ltd | Manufacturing | 2025 |
| Windermere Health Limited | Health & social care | 2022 |
| Windhorse Publications Ltd | Information & communication | 2004 |
| Windhorse Trust(The) | Other services | 1986 |
| Windmill Hill (Exning) Limited | Households | 2014 |
| Window Services (UK) Limited | Administrative & support | 2007 |
| Windrush Gear Ltd. | Manufacturing | 2006 |
| Windsor Park View Management Company Limited | Households | 1998 |
| Winfeed (UK) Limited | Information & communication | 2011 |
| Winfred International Metal Source Co., Ltd | Manufacturing | 2018 |
| Wing Haven Limited | Wholesale & retail | 2023 |
| Wing Heaven Limited | Manufacturing | 2023 |
| Wing NUT Projects Limited | Manufacturing | 2015 |
| Wingate Enterprises | Real estate | 1996 |
| Wings Assistance Ltd | Manufacturing | 2025 |
| WINGS77 Ltd | Manufacturing | 2025 |
| Wingston Trading Company Limited | Extraterritorial | 2019 |
| Wingz Maintenance Ltd | Manufacturing | 2025 |
| Wining International Trading Co., Ltd. | Wholesale & retail | 2021 |
| Winloon Intl Limited | Extraterritorial | 2024 |
| Winnerhouse Group Limited | Financial services | 2021 |
| Winnerlifting Safety Equipment Co., Ltd | Extraterritorial | 2020 |
| Winners (Chen) Ltd | Hospitality | 2016 |
| Winners Oriental Ltd | Wholesale & retail | 2013 |
| Winnfield Investments | Financial services | 2021 |
| Winning Workplace Ltd | Professional & scientific | 2014 |
| Winsa Ltd | Wholesale & retail | 2020 |
| Winset Trading Ltd | Extraterritorial | 2015 |
| Winstanley Court Flat Management Company Limited | Real estate | 2002 |
| Wintercomfort for the Homeless | Other services | 1991 |
| Winthorpe Partners Ltd | Real estate | 2020 |
| Wintringham Park (ST Neots) Management Company Limited | Households | 2022 |
| Winway Properties Ltd | Real estate | 2022 |
| WIOLAS230 Ltd | Manufacturing | 2024 |
| Wira Retail Limited | Wholesale & retail | 2021 |
| Wired Signals Ltd | Information & communication | 2026 |
| Wireless Internet UK Ltd | Information & communication | 2014 |
| Wireless Republic (UK) Limited | Manufacturing | 2024 |
| Wisbech Chamber of Commerce Limited | Professional & scientific | 2005 |
| Wisdom Bioscience Ltd | Manufacturing | 2025 |
| Wisdom International Trading Company Limited | Wholesale & retail | 2025 |
| Wise Cleaning Limited | Administrative & support | 2015 |
| Wise Epoch Educational Technologies Limited | Information & communication | 2022 |
| Wise Owlets Ltd | Manufacturing | 2022 |