| Whitton Country Parks Limited | Hospitality | 2022 |
| Whiz Machine Limited | Professional & scientific | 2025 |
| Whizzdigital Ltd | Professional & scientific | 2015 |
| WHO Properties Ltd | Real estate | 2017 |
| WHY NOT Design Limited | Professional & scientific | 2024 |
| WIB Developments Ltd | Real estate | 2022 |
| Wickham House RTM Company Limited | Households | 2024 |
| Wicks Consulting Limited | Professional & scientific | 2023 |
| Widopan Limited | Construction | 2010 |
| Wiffen and Sons Limited | Construction | 2015 |
| Wigham Mechanical Engineering Services Ltd | Construction | 2026 |
| Wight Away Services Limited | Professional & scientific | 2023 |
| Wight Staycation Limited | Hospitality | 2020 |
| WII ADJ 2 Ltd | Health & social care | 2017 |
| WII ADJ Limited | Health & social care | 2013 |
| Wild & SON Limited | Professional & scientific | 2006 |
| Wild Dog Management Limited | Arts & recreation | 2013 |
| Wildervans Limited | Extraterritorial | 2022 |
| Wildfire Design Consultants Limited | Professional & scientific | 2006 |
| Wildfire Energy Ltd | Energy | 2020 |
| Wildfire Holdings Ltd | Other services | 2015 |
| Wildfire Phones Ltd | Wholesale & retail | 2020 |
| Wilkins Packaging Limited | Manufacturing | 1995 |
| William George Entertainment Limited | Arts & recreation | 2011 |
| William Hire Services Ltd | Administrative & support | 2025 |
| William's Fullhouse Limited | Real estate | 2020 |
| Williams Bakery Limited | Hospitality | 2014 |
| Williams Developments (Little Burstead) Limited | Financial services | 2021 |
| Willisome Limited | Other services | 2017 |
| Willoughby Accounting Services Limited | Professional & scientific | 2009 |
| Willow Essex Ltd | Hospitality | 2018 |
| Willwood Ltd | Other services | 2022 |
| Wilshaw Engineering Design Limited | Administrative & support | 2014 |
| Wilshire Limited | Hospitality | 2016 |
| Wilson & Nicol Properties Ltd | Real estate | 2015 |
| Wilson Smoke and Grill Ltd | Hospitality | 2023 |
| Wiltshire Home Improvements Limited | Construction | 2002 |
| Wimbledon Experience Limited | Education | 2004 |
| Wimx Learning Limited | Education | 2025 |
| Winchbury Limited | Financial services | 1984 |
| Windermere Brickwork Limited | Construction | 2021 |
| Window Works Limited | Construction | 2026 |
| Windsor Integrated Services Group Limited | Professional & scientific | 2006 |
| Windsor Waste Management Limited | Water & waste | 2000 |
| Winful Associates Limited | Financial services | 2011 |
| Wing Chun World Limited | Wholesale & retail | 2014 |
| Winn Developments Ltd | Construction | 2025 |
| Winston & Young UK Limited | Professional & scientific | 2021 |
| Winston Tea Company Limited | Professional & scientific | 1969 |
| Winters Woodworks Ltd | Manufacturing | 2022 |
| Wintona Wealth Management Ltd | Professional & scientific | 2022 |
| Wise Garments Limited | Wholesale & retail | 2020 |
| Wishing Wells Day Care Ltd | Education | 2012 |
| Wixi Ltd | Wholesale & retail | 2022 |
| Wizard Sleeve Leisure LLP | | 2019 |
| Wizmeetings International Ltd. | Hospitality | 2013 |
| WJB Services Limited | Transport & logistics | 2004 |
| Wjxtd Limited | Administrative & support | 1994 |
| WOK 41 Limited | Hospitality | 2021 |
| Wolf International Limited | Wholesale & retail | 2015 |
| Wolf Outdoors Limited | Wholesale & retail | 2023 |
| Wolfrise Ltd | Education | 2026 |
| Wonder Holdings | Financial services | 2026 |
| Wonderyears Childcare Limited | Health & social care | 1999 |
| Wood Yard Developments Ltd | Extraterritorial | 2016 |
| Woodcroft Storage Ltd | Transport & logistics | 2018 |
| Woodford Heating Holdings Limited | Financial services | 2013 |
| Woodgrange Park Cemetery Ltd | Construction | 1978 |
| Woodhurst Finance Limited | Financial services | 2007 |
| Woodland Joinery Ltd | Manufacturing | 2011 |
| Woodlands Schools Limited | Education | 1978 |
| Woodman Warley Limited | Construction | 2025 |
| Woodpecker One Ltd | Administrative & support | 2021 |
| Woodwood (Group) Limited | Manufacturing | 1996 |
| Woody's Cakery Ltd | Wholesale & retail | 2015 |
| Woodz R US Ltd | Wholesale & retail | 2023 |
| Woolf Group Ltd. | Administrative & support | 2016 |
| Woolgar Properties Limited | Real estate | 2017 |
| Woollaston Limited | Real estate | 2019 |
| Words by Sarah MAC Limited | Administrative & support | 2009 |
| Work and Turn Design Ltd | Manufacturing | 2017 |
| Workhomeoffice Ltd | Construction | 2020 |
| Worklifeuk Limited | Wholesale & retail | 2020 |
| Workoola Ltd | Administrative & support | 2021 |
| Workratetv Ltd | Information & communication | 2018 |
| Worksecure Crime Limited | Education | 2023 |
| Workwear for ALL Limited | Other services | 2017 |
| World Freight Network Limited | Other services | 2004 |
| World of Pet Supplies Limited | Wholesale & retail | 2025 |
| World Professional Nineball Pool Corporation Limited | Arts & recreation | 2023 |
| World Series of Darts Ltd | Arts & recreation | 2015 |
| World Snooker Holding Limited | Professional & scientific | 2010 |
| World's END Leisure Limited | Hospitality | 2002 |
| Worldclaim Limited | Financial services | 2002 |
| Worldwide Books Limited | Wholesale & retail | 2023 |
| Worldwide Parcel Services Limited | Administrative & support | 2005 |
| Worrin Associates Limited | Professional & scientific | 2023 |
| Worrin Services Limited | Professional & scientific | 2010 |
| Worsfold Media Services Limited | Professional & scientific | 2013 |
| WOW Protein Limited | Wholesale & retail | 2016 |