| West London Homes (Harrow) Limited | Real estate | 2004 |
| West London Investments Limited | Real estate | 2011 |
| West London Landscapers Limited | Administrative & support | 2017 |
| West London PCO Management Ltd | Administrative & support | 2018 |
| West London Roofing Maintenance Limited | Construction | 2016 |
| West London Truck Bodies Limited | Wholesale & retail | 2012 |
| West Ruislip (Block B) Management Limited | Households | 1982 |
| West Ruislip(Block E)Management Company Limited | Households | 1984 |
| West Street Builders Limited | Construction | 2006 |
| West Street Homes Limited | Real estate | 2019 |
| West Tech Property Management Limited | Real estate | 2017 |
| West TEN Residential Ltd | Real estate | 2024 |
| West Yachting Ltd | Administrative & support | 2025 |
| West Yorkshire Foot and Ankle Clinic Limited | Health & social care | 2010 |
| West Zane SA Holding Limited | Financial services | 2024 |
| Westacott Hayes Limited | Construction | 2026 |
| Westbourne Tandoori Dorset Ltd | Hospitality | 2019 |
| Westbridge Build Ltd | Construction | 2026 |
| Westbridge Holdings Limited | Financial services | 2025 |
| Westbury Capital Limited | Administrative & support | 2010 |
| Westcombe Construction Limited | Construction | 2017 |
| Westcombe Developments Limited | Construction | 2018 |
| Westcombe Espana Limited | Construction | 2023 |
| Westcombe Estates Limited | Construction | 2007 |
| Westcombe Foundation | Health & social care | 2008 |
| Westcombe Group Limited | Wholesale & retail | 2021 |
| Westcombe Homes Limited | Real estate | 2015 |
| Westcombe Management Limited | Real estate | 2021 |
| Westcombe Plan Tech Limited | Information & communication | 2022 |
| Westcombe Properties Limited | Construction | 1986 |
| Westcombe Treasury Limited | Financial services | 2023 |
| Westcombe Uxbridge Limited | Construction | 2022 |
| Westcote Road Management Limited | Real estate | 2022 |
| Westcott Business Park Limited | Real estate | 2024 |
| Westenbach Limited | Professional & scientific | 2017 |
| Westend (Blackbird) Limited | Information & communication | 2015 |
| Westend Asset Management Limited | Real estate | 2013 |
| Westend Films Limited | Information & communication | 2008 |
| Westend Hospitality Solutions Ltd | Administrative & support | 2024 |
| Western Auto Solutions Ltd | Wholesale & retail | 2020 |
| Western Ghats Ltd | Wholesale & retail | 2020 |
| Westfield Supply Ltd | Wholesale & retail | 2025 |
| Westgate Investments Ltd | Real estate | 2024 |
| Westgate Property (Kent) Limited | Construction | 2017 |
| Westland Assets Limited | Real estate | 2019 |
| Westlands Developments Ltd | Real estate | 2014 |
| Westlands Ipswich Ltd | Real estate | 2025 |
| Westline Commercial Limited | Wholesale & retail | 2019 |
| Westlock Ltd | Wholesale & retail | 2026 |
| Westlyn Ltd | Transport & logistics | 2025 |
| Westmead Road Ltd | Construction | 2020 |
| Westmoor Road Developments Limited | Construction | 2023 |
| Westmoreland Accounting & Advisory Ltd | Professional & scientific | 2025 |
| Westone Burn Bullock Ltd | Construction | 2025 |
| Westone Capital Group Ltd | Professional & scientific | 2018 |
| Westrade Group Limited | Other services | 1982 |
| Weststar Cosmo Ltd | Real estate | 2014 |
| Westvilla Properties Limited | Real estate | 2002 |
| Westvision Limited | Real estate | 1999 |
| Westwater Medics Ltd | Wholesale & retail | 2021 |
| Westway Medics Limited | Extraterritorial | 2016 |
| Westwood & Willow Limited | Wholesale & retail | 2025 |
| Westwood Builder Supplies Limited | Wholesale & retail | 2025 |
| Wetech Accessories Ltd | Wholesale & retail | 2019 |
| Wetherby Hose Montessori Q Park Ltd | Education | 2026 |
| Wetherby House Estates Limited | Real estate | 2016 |
| Wetherby House Montessori Brondesbury Ltd | Education | 2025 |
| Wetherby House Montessori Harrow Ltd | Education | 2019 |
| Wetherby House Montessori Kensal Rise Limited | Education | 2016 |
| Wetherby House Montessori Kensal Village Ltd | Health & social care | 2024 |
| Wetherby House Montessori Limited | Education | 2013 |
| Wetherby House Training Centre Ltd | Education | 2021 |
| Weunite Education Services Ltd | Education | 2026 |
| Weuniteeducation CIC | Education | 2025 |
| Wexall Ltd | Information & communication | 2019 |
| Wexham Guest House Limited | Other services | 2004 |
| Wexston Estates Ltd | Real estate | 2012 |
| Weybridge Park Estates Limited | Hospitality | 2023 |
| Weybridge Pharma Limited | Health & social care | 2019 |
| Weybridge Private GP Limited | Professional & scientific | 2023 |
| Weybridge Real Estate Limited | Real estate | 2008 |
| Weyland Limited | Information & communication | 2026 |
| Weyman Investments Ltd | Real estate | 2021 |
| Weymouth Walk Management Company Limited | Real estate | 2008 |
| Weyout Home Ltd | Wholesale & retail | 2020 |
| WG SPV Limited | Administrative & support | 2019 |
| WHA Investments Ltd | Real estate | 2018 |
| What and WHY LLP | | 2014 |
| What IS on Limited | Professional & scientific | 2025 |
| Whatnext Global Limited | Administrative & support | 2016 |
| Whatson Sherlock Limited | Information & communication | 2019 |
| Wheatview Property Limited | Real estate | 2017 |
| Wheelhouse Limited | Wholesale & retail | 1975 |
| Wheelhouse Warehousing Limited | Wholesale & retail | 1975 |
| Whelan Haulage and SON Ltd | Transport & logistics | 2022 |
| Whelan Haulage Ltd | Transport & logistics | 2018 |
| When the Patient Designs Ltd | Professional & scientific | 2025 |
| Whetstone Clinic Limited | Health & social care | 2021 |
| Wheyvibes Ltd | Wholesale & retail | 2025 |
| Whincup Care Limited | Health & social care | 2016 |