| Unit Products Limited | Manufacturing | 1987 |
| United Kingdom Investor Equality Diversity (Ukied) CIC | Professional & scientific | 2012 |
| United Roots Ltd | Wholesale & retail | 2023 |
| Universal DRY Cleaners Ltd | Other services | 2024 |
| Universal Food & Wine Limited | Wholesale & retail | 2019 |
| Uploders Properties Limited | Real estate | 2001 |
| Upper Lodge Mews Limited | Real estate | 2017 |
| Upper Lodge Property Management Company Limited | Real estate | 2009 |
| Upreach Limited | Professional & scientific | 2016 |
| Urban & Grey Bespoke Aluminium Glazing Ltd | Construction | 2016 |
| Urban & Grey Door Company Limited | Construction | 2016 |
| Urban & Grey Ltd | Construction | 2014 |
| Urban Forest Arboriculture Limited | Agriculture & fishing | 2021 |
| Utas Advisors Limited | Professional & scientific | 2012 |
| V&T Supplies Ltd | Other services | 2025 |
| Vagamondo Ltd | Administrative & support | 2024 |
| Valerie Wade Limited | Wholesale & retail | 1985 |
| Valkyrie Capital Ltd | Professional & scientific | 2016 |
| Valuehouse Limited | Wholesale & retail | 2023 |
| Valuereal Property Ltd | Real estate | 2013 |
| Vamile Limited | Real estate | 1994 |
| Van Loon Sports Ltd | Wholesale & retail | 2014 |
| Vantisco Properties Ltd | Real estate | 2017 |
| Vassr Industries Ltd | Real estate | 2023 |
| Vaultinum UK Limited | Information & communication | 2021 |
| Vauxhall IT Solutions Ltd | Information & communication | 2025 |
| Vectornate UK Limited | Wholesale & retail | 2009 |
| Velzon Consultancy Limited | Professional & scientific | 2021 |
| Venson Automotive Solutions Limited | Wholesale & retail | 1992 |
| Venson Herts Limited | Wholesale & retail | 2006 |
| Venson Nottingham Limited | Wholesale & retail | 2001 |
| Venson Properties Limited | Real estate | 2001 |
| Venturer Software Ltd | Professional & scientific | 2019 |
| Verdaliving Ltd | Information & communication | 2025 |
| Versatil Limited | Other services | 2015 |
| Versatile Workforce Ltd | Information & communication | 2022 |
| Vertex Fire Ltd | Construction | 2024 |
| Vibrantage Ltd | Real estate | 2019 |
| Victorian Tiling & Landscape Contractors Limited | Construction | 2007 |
| Vietexperts Ltd | Professional & scientific | 2021 |
| VIGOUR8 Ltd | Wholesale & retail | 2018 |
| Village Grill Ltd | Hospitality | 2024 |
| Vincere Holdings Ltd | Real estate | 2024 |
| Vinegar Creative Agency Limited Liability Partnership | | 2025 |
| Vinegar Creative Limited | Information & communication | 2011 |
| Virtelix Limited | Information & communication | 2022 |
| Virtual Resource Solutions Limited | Administrative & support | 2015 |
| Vitruvius Property Holdings Ltd | Real estate | 2018 |
| Vizory Limited | Information & communication | 2018 |
| VLD Production Ltd | Professional & scientific | 2019 |
| VM Distro Ltd | Wholesale & retail | 2025 |
| VSW Construction Ltd | Construction | 2025 |
| Vtol Logistics Ltd | Transport & logistics | 2019 |
| Vusanezo Ltd | Health & social care | 2022 |
| Waggietails Training Limited | Other services | 2020 |
| Waine Tax Training Ltd | Education | 2016 |
| Waitermania Ltd | Wholesale & retail | 2024 |
| Walker Capital Investments Limited | Construction | 2018 |
| Walker Investment Homes Limited | Real estate | 2017 |
| Walker Land (Cumbria) Limited | Real estate | 2017 |
| WAM Advisors Ltd | Professional & scientific | 2019 |
| Warm-Up Plumbing & Heating Ltd | Other services | 2013 |
| Warwick Lodge Community Ltd | Households | 2026 |
| Wasd Gaming Ltd | Information & communication | 2023 |
| Washington Carpentry Ltd | Construction | 2015 |
| Water Lane Holdings Ltd | Real estate | 2018 |
| Watt Needs Doing Ltd | Construction | 2026 |
| Weathervelo Limited | Manufacturing | 2012 |
| Webb Locos Ltd | Manufacturing | 2020 |
| Wellington Enterprises London Ltd | Administrative & support | 2020 |
| Wellspring Support Ltd | Health & social care | 2025 |
| West London Customs Ltd | Manufacturing | 2023 |
| West London Imaging Ltd | Health & social care | 2020 |
| Westside Walkies Limited | Other services | 2015 |
| Whencash Limited | Professional & scientific | 2024 |
| WHH Property Management Ltd | Households | 2019 |
| Whitelance Limited | Water & waste | 1986 |
| Widgy Productions Ltd | Information & communication | 1999 |
| Wild Lily Property Ltd | Real estate | 2019 |
| Wildlife Without Borders | Professional & scientific | 2012 |
| Willow PAY Ltd | Professional & scientific | 1999 |
| Willow Tree Barn Ltd | Administrative & support | 2022 |
| Willow Valley Ltd | Extraterritorial | 2019 |
| Willowhay Services Ltd | Professional & scientific | 2007 |
| Wimbledon Football Club Holdings Limited | Arts & recreation | 2016 |
| Wimbledon Football Club Limited | Arts & recreation | 2016 |
| Wimbledon Park Tennis Academy Ltd | Education | 2024 |
| Winterton Court (Hampton Wick) Residents Association Limited | Households | 1973 |
| Winterton Court Freehold Ltd | Households | 2006 |
| Wirelogic Ltd | Construction | 2021 |
| Wisdom Investments Ltd | Real estate | 2017 |
| Within-Work Limited | Financial services | 2023 |
| Wittig - European & Asian Engineering and Consulting Ltd. | Professional & scientific | 2004 |
| Wizard Darts 2010 Limited | Arts & recreation | 2010 |
| Wize KID Limited | Education | 2018 |
| Wizoprop Ltd | Real estate | 2014 |
| WJC Transport Management Consultancy Ltd | Transport & logistics | 2022 |
| WK Property Developments Ltd | Real estate | 2019 |
| WM. Brown (Registrars) Limited | Professional & scientific | 1919 |
| Women in Work Group Ltd | Professional & scientific | 2024 |