| W.T.I. Fasteners Ltd | Manufacturing | 1989 |
| Walk of Fame Ltd | Arts & recreation | 1996 |
| Walker Medical Services Ltd | Health & social care | 2022 |
| Ward & Co Trusted Referrals Ltd | Professional & scientific | 2025 |
| Warren MEE Ltd | Education | 2026 |
| Waterworth Kitchens Limited | Construction | 2023 |
| Waynflete Advisory Limited | Administrative & support | 2023 |
| WE ARE One Studio Limited | Professional & scientific | 2014 |
| WE Love Data and AI Limited | Information & communication | 2026 |
| Wealden Contracts Limited | Administrative & support | 1988 |
| WEC Electrical Limited | Construction | 2014 |
| Weird Lime Development Ltd | Information & communication | 2013 |
| Weird Lime Group Ltd | Professional & scientific | 2022 |
| Wellmedic RX Consultations Ltd | Health & social care | 2025 |
| WG Prop Ltd | Real estate | 2026 |
| WGG Services Ltd | Professional & scientific | 2018 |
| Wgif Ltd | Hospitality | 2023 |
| Wgxyz Ltd | Professional & scientific | 2023 |
| Wham Enterprises Limited | Financial services | 2025 |
| Wham Mechanical Ltd | Wholesale & retail | 2025 |
| Wheeler Dealer Global Limited | Information & communication | 2017 |
| Wheeler Dealer Ltd | Information & communication | 1999 |
| White FOX Services Limited | Wholesale & retail | 2017 |
| White Hart Care Ltd | Health & social care | 2026 |
| Whittington Developments Limited | Construction | 2014 |
| Whittlesey Holdings Ltd | Construction | 2025 |
| Whotton Trading Limited | Wholesale & retail | 2023 |
| Wild Aster Limited | Information & communication | 2015 |
| Wileman Properties Ltd | Real estate | 2020 |
| Wilkinson Projects Management Ltd | Construction | 2023 |
| Willesley Limited | Professional & scientific | 2013 |
| Wilson Physiotherapy Services Limited | Health & social care | 1999 |
| Wilton Mews Estates Limited | Real estate | 2015 |
| Windowfix (Leics) Limited | Construction | 2004 |
| Winrose Construction Limited | Construction | 2021 |
| Wiseworld Enterprises (Textiles) Ltd | Wholesale & retail | 2013 |
| WK Ashby Limited | Hospitality | 2018 |
| Wolter (UK) Limited | Administrative & support | 2004 |
| Woodlander Limited | Wholesale & retail | 1991 |
| Wren Power Solutions Ltd | Professional & scientific | 2024 |
| Wright Direction Ltd | Professional & scientific | 2022 |
| Ws&S Distribution Limited | Transport & logistics | 1967 |
| Ws&S Solutions Holdings Limited | Extraterritorial | 2007 |
| Ws&S Solutions Limited | Transport & logistics | 2002 |
| X1LGJ Cloud & Infrastructure Consultancy Limited | Information & communication | 2019 |
| Xmts Group Ltd | Financial services | 2023 |
| Xplore Recruitment UK Ltd | Administrative & support | 2023 |
| XXX Buns Ltd | Hospitality | 2023 |
| Yellow Dog Associates Limited | Professional & scientific | 2024 |
| Yellow Dog Partners Limited | Professional & scientific | 2022 |
| Yellow Dog Products Ltd | Professional & scientific | 2026 |
| Yellow Dog Projects Limited | Professional & scientific | 2021 |
| Yellow Dog Resources Limited | Professional & scientific | 2020 |
| Yogi Home Ltd | Households | 2024 |
| Zakkk Ltd | Information & communication | 2019 |
| Zaliant Healthcare Limited | Wholesale & retail | 2015 |
| Zaliant Trading Limited | Wholesale & retail | 2015 |
| Zetico Ltd | Professional & scientific | 2009 |
| Zhongying Holding Group (London) Co. Limited | Administrative & support | 2019 |
| ZOO Interiors Limited | Wholesale & retail | 2009 |
| Zouchie Ltd | Arts & recreation | 2020 |