| Wine of a Kind Ltd | Administrative & support | 2010 |
| Winfo Ltd | Professional & scientific | 2016 |
| Wings to the Past CIC | Education | 2023 |
| Winning Ribbons Ltd | Manufacturing | 2011 |
| Winnington Topper Ltd | Real estate | 2023 |
| Winter French Limited | Other services | 2017 |
| Wired on Time Ltd | Construction | 2020 |
| Wisdom 4 Quality Systems Limited | Professional & scientific | 2023 |
| Wise Wares UK Limited | Information & communication | 2013 |
| Wishing Well Home Care Limited | Health & social care | 2019 |
| Wisteria Cottages Ltd | Hospitality | 2022 |
| WMB Petroleum Spirit (1) Limited | Construction | 2017 |
| WME Holding Limited | Financial services | 2024 |
| Wmecommerce Ltd | Wholesale & retail | 2024 |
| WMO 1907 Ltd | Other services | 2023 |
| WMT Bearings (GB) Ltd | Wholesale & retail | 2013 |
| Woka Holdings Limited | Financial services | 2024 |
| Wolborough Hill (Newton Abbot) Management Company Limited | Real estate | 2019 |
| Wolds Accountants Limited | Professional & scientific | 2015 |
| Wolds View Residents Management Company Limited | Households | 2019 |
| Wolf House Publishing Limited | Information & communication | 2007 |
| Wome Limited | Professional & scientific | 2022 |
| Wonderdays Limited | Other services | 2019 |
| Woodcott Group Ltd | Construction | 2025 |
| Woodfield Event Management Ltd | Professional & scientific | 2013 |
| Woodfield Lawn Tennis Club Nominees Ltd | Extraterritorial | 2021 |
| Woodgate Growers Limited | Agriculture & fishing | 2005 |
| Woodings and Co Jewellery Ltd | Wholesale & retail | 2022 |
| Woodings Group Limited | Other services | 2024 |
| Woodland Timber Products Limited | Manufacturing | 2012 |
| Woodland View (Polegate) Management Limited | Real estate | 2019 |
| Woodland Walk (Market Rasen) Management Company Limited | Real estate | 2022 |
| Woodlands (Shrewsbury) Management Company Limited | Households | 2003 |
| Woodlands (Southampton) Management Company Limited | Households | 1987 |
| Woodlands (the Crescent) Management Company Limited | Households | 1994 |
| Woodlands Grange (Addison Road) Management Company Limited | Households | 1994 |
| Woodman Carpentry & Joinery Ltd | Construction | 2018 |
| Woods Block Management Limited | Real estate | 1999 |
| Woodseats Maintenance Limited | Households | 2015 |
| Woodsmart Lettings Ltd | Real estate | 2020 |
| Woodsy's Inn Limited | Hospitality | 2023 |
| Woodsyde Developments Ltd | Construction | 2006 |
| Woon SAM Dental Limited | Health & social care | 2025 |
| Wooree Ltd | Manufacturing | 2026 |
| Woosahberry Hills Limited | Wholesale & retail | 2024 |
| Woosnam Lettings Ltd | Real estate | 2018 |
| Wootton & Edwards Limited | Arts & recreation | 2015 |
| Wootton Finance Limited | Financial services | 2021 |
| Worcester Hair Loss Clinic Ltd | Other services | 2024 |
| Worcester Wholesale Meat Co. Limited | Wholesale & retail | 1987 |
| Word Warriors Ltd | Arts & recreation | 2023 |
| Wordsley Management Company Limited | Households | 2009 |
| Workflow Consulting Limited | Manufacturing | 1998 |
| Working the Edge Ltd | Administrative & support | 2016 |
| Workshyfop Limited | Arts & recreation | 2025 |
| Workspace Anywhere Ltd | Information & communication | 2018 |
| World of Wigle Limited | Administrative & support | 2020 |
| World Youth Music Foundation (UK) | Education | 1991 |
| Worldwide Structures Ltd | Manufacturing | 2014 |
| Worthen Stores Ltd | Wholesale & retail | 2015 |
| WP Enterprises Ltd | Other services | 2025 |
| WR Motors Limited | Wholesale & retail | 2012 |
| WR Partners AQI LLP | | 2024 |
| WR Partners Audit LLP | | 2024 |
| WR Partners U.K. Ltd | Extraterritorial | 2022 |
| WRAP101 Limited | Other services | 2024 |
| Wrekin Lettings Ltd | Extraterritorial | 2012 |
| Wrekin Project Solutions Limited | Information & communication | 2005 |
| Wright Choice Home Improvements Ltd | Construction | 2014 |
| Wrights Memorials Limited | Other services | 2023 |
| Wrismat Limited | Wholesale & retail | 2020 |
| Write Here! Limited | Wholesale & retail | 2004 |
| WRS Livestock Ltd | Agriculture & fishing | 2025 |
| WSB Capital Ltd | Construction | 2023 |
| WT Time Pieces Limited | Wholesale & retail | 2014 |
| WTH Properties Ltd | Real estate | 2017 |
| WVS Group Ltd | Information & communication | 2024 |
| Wwhc EOT Limited | Extraterritorial | 2021 |
| Wychbury Properties LLP | | 2010 |
| Wyke Plant Hire Ltd | Administrative & support | 2004 |
| Wykey Renewables Limited | Energy | 2021 |
| Wyle Blue Bar & Restaurant Ltd | Hospitality | 2023 |
| Wyle Blue World Ltd | Real estate | 2017 |
| Wyle COP Barbers Ltd | Other services | 2025 |
| Wylo Solutions Ltd | Information & communication | 2024 |
| Wynn Family Holdings Limited | Financial services | 2018 |
| Wynns Coppice Development Ltd | Construction | 2022 |
| Wynona Limited | Administrative & support | 2004 |
| X-Plor Elements Limited | Professional & scientific | 2022 |
| Xapplezz Ltd | Information & communication | 2022 |
| Xaxo Corporation Ltd | Wholesale & retail | 2025 |
| XLS Solutions Ltd | Professional & scientific | 2023 |
| XS the Property Trader Ltd | Real estate | 2023 |
| Xtra Phones UK Ltd | Information & communication | 2012 |
| Xtrasan Limited | Manufacturing | 2019 |
| XXX Auto Parts Ltd | Wholesale & retail | 2018 |
| Y X WU Limited | Hospitality | 2019 |
| Y3M Limited | Professional & scientific | 2020 |
| YAK & Yeti Hotel Limited | Hospitality | 2023 |
| YAK & Yeti Restaurant Limited | Hospitality | 2023 |