| Two Steps Twice Ltd | Administrative & support | 2023 |
| TWS Capital Ltd | Real estate | 2022 |
| Tyna Ltd | Wholesale & retail | 2018 |
| Tyneham Limited | Wholesale & retail | 2005 |
| Tyre Hub (Herts) Ltd | Wholesale & retail | 2023 |
| Tyrrell's Tree Services Limited | Other services | 2024 |
| UAA Consultancy Ltd | Professional & scientific | 2021 |
| UEP Holdings Limited | Financial services | 2021 |
| UEP Switchgear Limited | Manufacturing | 1988 |
| Uisce ARD Ltd | Wholesale & retail | 2008 |
| UK Estate Group Ltd | Financial services | 2021 |
| UK Ingredients Ltd | Wholesale & retail | 2025 |
| UK Landscapes Construction Limited | Other services | 2015 |
| UK Property Finance Solutions Ltd | Financial services | 2025 |
| UK Railtours Limited | Transport & logistics | 2022 |
| UK Travel Club Ltd | Administrative & support | 2023 |
| UK101 Traders Limited | Wholesale & retail | 2025 |
| Ukan Commercial Finance Limited | Financial services | 2015 |
| UKL Limited | Other services | 2011 |
| UKL Management Limited | Other services | 2013 |
| Ukmetalsigns Ltd | Wholesale & retail | 2024 |
| Umicore UK Ltd | Wholesale & retail | 2003 |
| Umlaut Solutions Limited | Information & communication | 2022 |
| Unavasco Ltd | Real estate | 2023 |
| Unbroken Performance Nutrition Ltd | Other services | 2023 |
| Unconditional Solutions Ltd | Professional & scientific | 2020 |
| Underdog on Top Limited | Information & communication | 2025 |
| Underground London Limited | Construction | 2012 |
| Unico Develop Ltd | Construction | 2023 |
| Unity Bridging Limited | Financial services | 2026 |
| Unity Service Solutions Limited | Professional & scientific | 2020 |
| Unityplaceliving Ltd | Health & social care | 2025 |
| Universal Property Maintenance & Services Limited | Other services | 2011 |
| Unlockav Limited | Professional & scientific | 2025 |
| Unltd Beer Limited | Extraterritorial | 2020 |
| Upad Limited | Administrative & support | 2008 |
| Uplyme Mews Management Company Limited | Households | 2020 |
| Upsum Ltd | Information & communication | 2021 |
| Urban Stash Hertford Limited | Transport & logistics | 2025 |
| Urban Stash Storage Limited | Transport & logistics | 2025 |
| Urban Voices Collective Ltd | Information & communication | 2014 |
| Urbanspace Planning Ltd | Professional & scientific | 2020 |
| Urbantrade Solutions Ltd | Wholesale & retail | 2026 |
| Urlux Holidays Ltd | Administrative & support | 2017 |
| Urspace Solutions Ltd | Health & social care | 2019 |
| Usualbase Limited | Real estate | 1987 |
| Uttersense Limited | Information & communication | 2003 |
| V & S Scaffolding (Hertford) Ltd | Construction | 2009 |
| V.M. Management Company Limited | Households | 1996 |
| Valegro Group Ltd | Real estate | 2023 |
| Valiente Partners Limited | Administrative & support | 2025 |
| Valore Properties Limited | Real estate | 2020 |
| Valued Support Services Ltd | Extraterritorial | 2013 |
| Vanargon Ltd | Wholesale & retail | 2022 |
| Vanda Property Limited | Real estate | 2015 |
| Vantage Facility Services Ltd | Financial services | 2025 |
| Vapeandecigstore Ltd | Administrative & support | 2014 |
| Vastech Ltd | Information & communication | 2025 |
| Vector an Ltd | Wholesale & retail | 2026 |
| Vector Cleaning Services Limited | Administrative & support | 2007 |
| Velesora Ltd | Professional & scientific | 2024 |
| Velocity INT LLP | | 2025 |
| Vena Limited | Administrative & support | 2012 |
| Vendi Acquisitions Limited | Wholesale & retail | 2023 |
| Veritas Services Holding Ltd | Financial services | 2025 |
| Veritas Services Ltd | Professional & scientific | 2025 |
| Veritasium Ventures Limited | Other services | 2022 |
| Veronique Inizan Limited | Administrative & support | 2017 |
| Versende Limited | Administrative & support | 2014 |
| Verve (Hounslow) Management Company Limited | Households | 2006 |
| Verve Electrical Solutions Limited | Construction | 2023 |
| Vestcom Limited | Construction | 2010 |
| Vestry Court Limited | Households | 1995 |
| Vexed Limited | Information & communication | 2002 |
| VF Foods Limited | Hospitality | 2024 |
| Victoria Court (High Wycombe) Residents Association Limited | Households | 1983 |
| Victoria Mills Freehold Ltd | Households | 2021 |
| Victoria Mills RTM Company Limited | Households | 2004 |
| Victoria Software Solutions Limited | Information & communication | 1998 |
| Victoria's Property Limited | Real estate | 2009 |
| Victory SAP Partners Ltd | Administrative & support | 2025 |
| Viewpoint (Ealing) Limited | Households | 2006 |
| Viewside Lodge Limited | Households | 1994 |
| Village Cars (Herts) Ltd | Wholesale & retail | 2015 |
| Villbeen Limited | Professional & scientific | 2023 |
| Vinegar's Luck Ltd | Manufacturing | 2022 |
| Vinny Property Limited | Real estate | 2024 |
| Vintage Creations Limited | Construction | 2011 |
| Virosa Nursery Limited | Agriculture & fishing | 2018 |
| Virstor Ltd | Wholesale & retail | 2014 |
| Virtue Web Solutions Ltd | Information & communication | 2020 |
| Visibl Wellness Ltd | Health & social care | 2025 |
| Vision (Office Automation) Limited | Other services | 1985 |
| Vision Design Glass and Glazing Ltd | Construction | 2019 |
| Vision Group (Holdings) Limited | Financial services | 2011 |
| Vision Group Holdco Limited | Financial services | 2023 |
| Vision Manchester Limited | Financial services | 2021 |
| Vision Office Technical Services Limited | Other services | 2011 |
| Vision Unified Communications Limited | Wholesale & retail | 2023 |
| Vivante Limited | Professional & scientific | 1997 |