| Welland Vale Nurseries Limited | Agriculture & fishing | 1974 |
| Welland Valley Feeds (Holdings) Limited | Financial services | 2017 |
| Wellbeing Co International Limited | Wholesale & retail | 2019 |
| Wellbeing Therapy Solutions Ltd | Health & social care | 2021 |
| Welles Brothers Limited | Transport & logistics | 2016 |
| Wellingborough Ltd | Wholesale & retail | 2024 |
| Wellmade Designs Limited | Manufacturing | 2022 |
| Wellness Gift Company Limited | Manufacturing | 2016 |
| Wellness Housing Ltd T/A Prosperity Housing Group Leicester Ltd | Health & social care | 2024 |
| Wellness Nerds Ltd | Manufacturing | 2025 |
| Wellness Workshops 4 Everyone Community Interest Company | Health & social care | 2026 |
| Wellnessworks Consulting Ltd | Arts & recreation | 2024 |
| Wellsbright Auctions Ltd | Administrative & support | 2025 |
| Wellson Ltd | Wholesale & retail | 2014 |
| Wellspine Limited | Health & social care | 2019 |
| Wellspring Centres Limited | Construction | 1998 |
| Wellsworth Property Limited | Real estate | 2020 |
| Wellvora Ltd | Health & social care | 2025 |
| Wellwood Properties Ltd | Real estate | 2018 |
| Wellworth Property Portfolio Limited | Real estate | 2025 |
| WELOVE2PRINT Limited | Administrative & support | 2013 |
| Welstead Caster Ltd | Wholesale & retail | 2025 |
| Welton Groves Ltd | Wholesale & retail | 2024 |
| Welton H.I.C. Limited | Wholesale & retail | 2008 |
| Wemaize Ltd | Transport & logistics | 2024 |
| Wembrook Valeting Centre Ltd | Wholesale & retail | 2025 |
| WEN Holdings Ltd | Wholesale & retail | 2024 |
| Wendhyy House of Extension Ltd | Administrative & support | 2026 |
| Wenduwigsandhairs Ltd | Other services | 2025 |
| Wendy Louise Higgins Limited | Extraterritorial | 2025 |
| Wendy Paine Ltd | Professional & scientific | 2022 |
| Wentworth Green Ltd | Professional & scientific | 2020 |
| Wenzo Limited | Other services | 2026 |
| Wepc Ltd | Professional & scientific | 2020 |
| Wernick Ltd | Manufacturing | 2009 |
| Werx Holdings Ltd | Financial services | 2024 |
| Weselmotors Limited | Wholesale & retail | 2024 |
| West (Fosse) Ltd | Hospitality | 2025 |
| West 1 Gifts Ltd | Wholesale & retail | 2019 |
| West END Holdings Limited | Real estate | 2015 |
| West END Realty Ltd | Real estate | 2023 |
| West Hill Care Home Ltd | Health & social care | 2020 |
| West Knighton Productions Ltd | Information & communication | 2014 |
| West Lothian Food Service Ltd | Hospitality | 2024 |
| West Oak Limited | Construction | 2019 |
| West of the Moon Limited | Professional & scientific | 2016 |
| West Rock Consultants Limited | Energy | 2024 |
| Westbourne Haulage Ltd | Transport & logistics | 2014 |
| Westbridge Properties Limited | Real estate | 1998 |
| Westbury Care Limited | Health & social care | 1996 |
| Westbury Case Management Ltd | Health & social care | 2022 |
| Westbury Control Systems Limited | Manufacturing | 1999 |
| Westbury Ford Ltd | Wholesale & retail | 2025 |
| Westcoast Installation (SW) Ltd | Energy | 2019 |
| Westcotes Care Management Limited | Real estate | 2019 |
| Westcotes Development Limited | Real estate | 2016 |
| Westcotes Holdings Ltd | Financial services | 2023 |
| Westcotes Ltd | Manufacturing | 2017 |
| Westcotes Properties Limited | Real estate | 1998 |
| Westcotes Property Management Ltd | Real estate | 2021 |
| Westcotes Two Limited | Real estate | 2020 |
| Westcotes Wills Limited | Professional & scientific | 2021 |
| Westdale Court Limited | Real estate | 2003 |
| Westdreams Limited | Wholesale & retail | 2014 |
| Westend Fabrics Limited | Wholesale & retail | 1989 |
| Westend Furnish Ltd | Wholesale & retail | 2026 |
| Westerby (Holdings) Limited | Professional & scientific | 1989 |
| Westerby EOT Limited | Financial services | 2024 |
| Westerby Pension Administration Limited | Financial services | 2018 |
| Westerby Trustee Services Limited | Financial services | 1990 |
| Westerdale Elite Ltd | Transport & logistics | 2015 |
| Westermans | | 1994 |
| Westermans International Limited | Wholesale & retail | 2003 |
| Western Argyle Limited | Construction | 2016 |
| Western Landscapes & Garden Design Ltd | Administrative & support | 2024 |
| Western Link Traders Limited | Wholesale & retail | 2013 |
| Western Park Joinery & Building Services Limited | Construction | 2016 |
| Western Park Property Investments Ltd | Real estate | 2023 |
| Western Ward CIC | Health & social care | 2023 |
| Westex Management LP | | 2017 |
| Westfield Healthcare Ltd | Health & social care | 2012 |
| Westfield Hollis Ltd | Wholesale & retail | 2024 |
| Westfield Hotels London Limited | Real estate | 2013 |
| Westfield Rise Limited | Financial services | 2020 |
| Westfields Tennis Club Ltd | Arts & recreation | 2023 |
| Westgate Asset Management Limited | Professional & scientific | 2020 |
| Westgate Residential Assets Limited | Real estate | 2022 |
| Westington Transport Ltd | Transport & logistics | 2014 |
| Westj Ltd | Financial services | 2023 |
| Westlaw Plant Limited | Real estate | 1989 |
| Westleigh Flinton Ltd | Wholesale & retail | 2025 |
| Westleigh J Scales Limited | Professional & scientific | 2012 |
| Westley Enterprises UK Limited | Extraterritorial | 1999 |
| Westmanor Property Services Limited | Real estate | 2003 |
| Westmanor Student Living Limited | Real estate | 2017 |
| Westmont Marketing Limited | | 1973 |
| Weston Wood House Limited | Transport & logistics | 2020 |
| Westpoint (Nottingham) Management Company Limited | Households | 2002 |
| Westpoint Transport Ltd | Transport & logistics | 2023 |
| Westridge Productivity Ltd | Transport & logistics | 2014 |