| Wakson Limited | Extraterritorial | 2018 |
| Walana Limited | Wholesale & retail | 2025 |
| Walbrook PM Solutions Ltd | Construction | 2017 |
| Wallace Window Cleaning Services Ltd | Administrative & support | 2018 |
| Wallington Builders Limited | Construction | 2022 |
| Wallington Physio Ltd | Health & social care | 2009 |
| Walnut & Resin Ltd | Professional & scientific | 2024 |
| Walton Pizzeria Co Limited | Hospitality | 2025 |
| Wandle House Riverside Ltd | Construction | 2015 |
| Wane Michaels Limited | Information & communication | 2015 |
| Wang DEE Beckenham Limited | Manufacturing | 2018 |
| Wang DEE Limited | Financial services | 2012 |
| Waqas Ahmed Limited | Transport & logistics | 2025 |
| Ward and SON Scaffolding Ltd | Construction | 2023 |
| Warda & Maya Limited | Wholesale & retail | 2024 |
| Wastenator Limited | Water & waste | 2019 |
| Wasz Limited | Wholesale & retail | 2014 |
| Waterlake Studio Ltd | Information & communication | 2022 |
| Wavyprints Ltd | Information & communication | 2024 |
| Ways Investments Limited | Real estate | 2019 |
| WD Property Investments Limited | Real estate | 2017 |
| WE CAN (SW) Ltd | Construction | 2022 |
| WE Care for Appliances Ltd | Administrative & support | 2025 |
| WE Convo CIC | Education | 2026 |
| WE Rise Properties Limited | Real estate | 2021 |
| Wearedfg Ltd | Extraterritorial | 2023 |
| Weavewire Electricals Ltd | Construction | 2018 |
| Weis Metal Ltd | Manufacturing | 2017 |
| Welivedit.Ai Ltd | Information & communication | 2025 |
| Well Retail Group Limited | Wholesale & retail | 2020 |
| Wellesley Inn Ltd | Real estate | 2024 |
| Wellesley Ninety One Ltd | Hospitality | 2018 |
| Wellie Healthcare Services Limited | Health & social care | 2012 |
| Wellplus Ltd | Construction | 2016 |
| Wells Electronics Ltd | Information & communication | 2018 |
| Werner Studios Ltd | Construction | 2013 |
| Wescon Holdings Limited | Manufacturing | 2025 |
| West Coast Plastering Limited | Administrative & support | 2018 |
| West Hill Motors Ltd | Wholesale & retail | 2023 |
| West Indian Families and Friends Association (W.I.F.F.A.) Limited | Other services | 2003 |
| Westgate Insight Limited | Information & communication | 2023 |
| Westlake London Limited | Wholesale & retail | 2011 |
| Westwinghomes Limited | Manufacturing | 2019 |
| WH Automotive Repair Ltd | Wholesale & retail | 2024 |
| WH Shah Ltd | Wholesale & retail | 2017 |
| Where IS Chalino Ltd | Information & communication | 2025 |
| WHH Transport Ltd | Transport & logistics | 2020 |
| While True Limited | Information & communication | 2026 |
| White Eagle Scaffolding Ltd | Construction | 2005 |
| White Falcon (Vision to FLY) Ltd | Wholesale & retail | 2022 |
| White Tiger Holdings Limited | Wholesale & retail | 2021 |
| Whites Training and Compliance Ltd | Professional & scientific | 2026 |
| Whitworth House Limited | Real estate | 2022 |
| Whyteoak Ltd | Hospitality | 2016 |
| Wigs by CHI Limited | Other services | 2025 |
| Wiki Networks Limited | Information & communication | 2021 |
| Wiki Networks London Limited | Information & communication | 2026 |
| William Harris Junior and Partners Limited | Real estate | 2015 |
| Willow BID Limited | Administrative & support | 2009 |
| Willow Lane Pallets Ltd | Administrative & support | 2023 |
| Willow Powder Coating Limited | Construction | 2007 |
| Wilson Electric (Battersea) Limited | Manufacturing | 1951 |
| Wilson Electric (Motor Sales) Limited | Wholesale & retail | 1995 |
| Wilson GRP Limited | Professional & scientific | 2023 |
| Wilson Holistic Care Ltd | Health & social care | 2012 |
| Wimbledon Food Express Ltd | Hospitality | 2026 |
| Wimbledon Gardeners Ltd | Transport & logistics | 2018 |
| Winam Ltd | Wholesale & retail | 2026 |
| Wing Bros Ltd | Hospitality | 2026 |
| Winkare Limited | Transport & logistics | 2016 |
| Winning Projects Events Ltd | Administrative & support | 2018 |
| Winston Knight Ltd | Real estate | 2016 |
| Wisdom Home Care Limited | Information & communication | 2014 |
| Wisdom Property Developers Ltd | Real estate | 2017 |
| Wiseflow UK Limited | Wholesale & retail | 2026 |
| WITH2TAILS Ltd | Other services | 2024 |
| WJM Residential Ltd | Real estate | 2025 |
| WL South East Limited | Other services | 2021 |
| WMM Logistics Limited | Transport & logistics | 2021 |
| Woking Fencing ( UK ) Ltd | Construction | 2025 |
| Womble Education Limited | Education | 2024 |
| Women of Colour in Public Services CIC | Professional & scientific | 2025 |
| Women of Esteem UK CIC | Education | 2025 |
| Women's Enterprise and Leadership Agency Ltd | Extraterritorial | 2015 |
| Women's Wellbeing Collective CIC | Education | 2024 |
| Wonberta Trading Company Limited | Wholesale & retail | 2026 |
| Wonder Gardens 2020 Ltd | Administrative & support | 2020 |
| Wood Empire Limited | Professional & scientific | 2009 |
| Wood Street Law Ltd | Professional & scientific | 2020 |
| Woodbourne Close Ltd | Hospitality | 2018 |
| Woodcock & Booth Limited | Extraterritorial | 1991 |
| Woodhead Components Limited | Extraterritorial | 1937 |
| Woodhead Construction Services Limited | Extraterritorial | 1948 |
| Woodhead Limited | Extraterritorial | 1992 |
| Woodhead Steel Limited | Extraterritorial | 1946 |
| Woolfox Ltd | Wholesale & retail | 2022 |
| Workout With Pride Ltd | Arts & recreation | 2020 |
| Workriq Systems Ltd | Information & communication | 2026 |
| World Business Group Ltd. | Construction | 2020 |
| World Cognac Club Ltd | Wholesale & retail | 2022 |