| Watertight Bathrooms (Surrey) Limited | Construction | 2009 |
| Watkins Cole Limited | Construction | 2010 |
| Watkins Cole Property Ltd | Real estate | 2015 |
| Watson & Sole Associates Limited | Professional & scientific | 1971 |
| Watson & Sole Holdings Ltd | Financial services | 2023 |
| Watson Home Solutions Ltd | Construction | 2018 |
| Watts on Electrics Ltd | Construction | 2024 |
| Watwingi Limited | Health & social care | 2019 |
| Wave and Sea Power Ltd | Professional & scientific | 2023 |
| WBM Cars Ltd | Transport & logistics | 2023 |
| WBM Europa Ltd | Wholesale & retail | 2018 |
| WBM Motors Ltd | Wholesale & retail | 2026 |
| Wbmo Consultancy Services Ltd | Professional & scientific | 2025 |
| WE Build ANY Loft Ltd | Construction | 2018 |
| WE FIX IT ALL Ltd | Construction | 2025 |
| WE Inspect Limited | Professional & scientific | 2020 |
| WE Matter Studio CIC | Information & communication | 2026 |
| WE Trade Waves by TEE & Alain Ltd | Education | 2019 |
| We'Ve GOT the Power Ltd | Construction | 2015 |
| Weald Refrigeration Limited | Manufacturing | 1981 |
| Wealdstone Property Investments Limited | Extraterritorial | 2009 |
| Webbs Sales and Lettings Limited | Real estate | 2010 |
| Webmost Ltd | Wholesale & retail | 2020 |
| Webnexs Limited | Information & communication | 2021 |
| Webview Television Ltd | Information & communication | 2008 |
| Weddingbird Tech Limited | Wholesale & retail | 2022 |
| Weekendzie Productions Ltd | Manufacturing | 2025 |
| Wehive Ltd | Administrative & support | 2022 |
| Wehive Partners Ltd | Administrative & support | 2025 |
| Weir Archer Academy | Arts & recreation | 2013 |
| Weko (U.K.) Limited | Professional & scientific | 1979 |
| Welfie Ltd | Real estate | 2020 |
| Wellesley Freeholders Limited | Real estate | 2008 |
| Wellington Court (Waterhouse Lane) Management Company Limited | Households | 2022 |
| Wellness Retreat Ltd | Wholesale & retail | 2022 |
| Wells Builds Ltd | Construction | 2025 |
| Welton House Limited | Professional & scientific | 2012 |
| Wemake - Textiles Consulting Limited | Professional & scientific | 2013 |
| Wemove Moving Company Limited | Transport & logistics | 2024 |
| Wendover Stables Limited | Administrative & support | 1972 |
| WES Consulting Limited | Professional & scientific | 2024 |
| Wesco Labs Limited | Wholesale & retail | 2020 |
| West Bakes Cookies Ltd | Wholesale & retail | 2023 |
| West Kensington & Gibbs Green Boxing Club C.I.C. | Arts & recreation | 2017 |
| Westbourne Academy Trust | Education | 2011 |
| Westbury Close Freehold Limited | Real estate | 2005 |
| Westbury Close Management Limited | Real estate | 1987 |
| Westcroft Judo Community Interest Company | Arts & recreation | 2008 |
| Western Engineering Limited | Professional & scientific | 1999 |
| Western Vehicles Limited | Wholesale & retail | 2010 |
| Westfield Property & Co Limited | Real estate | 2014 |
| Westlake Investments Limited | Real estate | 2020 |
| Westmead Design Services Limited | Professional & scientific | 2010 |
| Westminster Court (Thornton Heath) Management Limited | Households | 1964 |
| Westmont Services Ltd | Professional & scientific | 2025 |
| Westridge Engineering Limited | Construction | 2025 |
| Westside & Co Inc Properties Limited | Real estate | 2025 |
| Wewise Solutions Ltd | Wholesale & retail | 2021 |
| Weybridge Plumbing and Heating Ltd | Construction | 2026 |
| WGD Holdings Limited | Real estate | 2025 |
| WGD Investments Ltd | Real estate | 2018 |
| What Service Limited | Information & communication | 2005 |
| Wheels.App Limited | Other services | 2023 |
| Whisker and Finch Properties Ltd | Real estate | 2024 |
| Whisky and Bourbon Breweriana Limited | Wholesale & retail | 2020 |
| Whisper of Sleep Limited | Other services | 2026 |
| White Christmas Theatre Ltd | Administrative & support | 2017 |
| White Lotus Developments Ltd | Administrative & support | 2022 |
| White Medcomms Limited | Information & communication | 2023 |
| White Motif Ventures Limited | Real estate | 2019 |
| Whitehall Consulting Ltd | Construction | 2012 |
| Whiteoak Developments Limited | Construction | 1993 |
| Whiteoak Southern Limited | Administrative & support | 2011 |
| Whites Transport and Logistics Services Ltd | Transport & logistics | 2015 |
| Whittlewood Consulting Services LLP | | 2012 |
| Wholesale Investor Europe Limited | Information & communication | 2021 |
| WI London Events Ltd | Arts & recreation | 2025 |
| Widerange Professional Services Limited | Professional & scientific | 2005 |
| Wijayasingams Ltd | Health & social care | 2025 |
| Wild Horse Holdings Ltd | Real estate | 2016 |
| Wild Tiger Martial Arts Academy Club Ltd | Education | 2025 |
| Wildan Developments Ltd | Construction | 2009 |
| Wilfer Ltd | Administrative & support | 2018 |
| Williams Pitt (International) Limited | Financial services | 2008 |
| Williams Wood Accountants Limited | Professional & scientific | 2022 |
| Willow Care 4 U Ltd | Other services | 2004 |
| Willow Cottages 11 Ltd | Real estate | 2024 |
| Willow Environmental Services Limited | Construction | 2025 |
| Willow Property and Investments Ltd | Real estate | 2017 |
| Wilmington Lodge Limited | Real estate | 2024 |
| Wilmot House (Managements) Limited | Households | 1969 |
| Wilson News Ltd | Wholesale & retail | 2015 |
| Wimbledon Capital Ltd | Construction | 2012 |
| Wimbledon Consulting Ltd | Construction | 2012 |
| Wimbledon Contractors Ltd | Construction | 2017 |
| Wimbledon Orthodontic Laboratories Limited | Health & social care | 2004 |
| Wimbledon Village Riding Stables Limited | Other services | 1999 |
| Wimbledon Village Stables Ltd | Other services | 2025 |
| Windlebox Limited | Manufacturing | 2025 |
| Wing Preservation Limited | Construction | 1997 |