| Underleaf Studio Limited | Information & communication | 2013 |
| Unheard History Ltd | Arts & recreation | 2024 |
| UNI Choice Study Abroad Consultants Ltd | Education | 2024 |
| Unicorn Contracting Limited | Real estate | 2016 |
| Unilink Global Services Ltd | Hospitality | 2025 |
| Unio Works Limited | Professional & scientific | 2024 |
| Union Financier DE Geneva Ltd | Information & communication | 2026 |
| Union Jack OIL PLC | Mining & quarrying | 2011 |
| Union Jack Sales Consultancy Limited | Wholesale & retail | 2016 |
| Union Street (Swindon) Limited | Households | 2015 |
| Unite Foods Trading Limited | Wholesale & retail | 2012 |
| United Fast Food Company Ltd | Hospitality | 2020 |
| Universal Carpentry Ltd | Construction | 2010 |
| Universal Closures Limited | Manufacturing | 2004 |
| Universal Investment Capital Corporation UK Ltd | Agriculture & fishing | 2025 |
| Universal Properties (South West) Ltd | Real estate | 2025 |
| Universal Results Ltd | Professional & scientific | 2025 |
| Universci Press Ltd | Information & communication | 2023 |
| Unknown Road Limited | Professional & scientific | 2017 |
| Unmnd Limited | Manufacturing | 2015 |
| Untamed Creative Ltd | Information & communication | 2025 |
| Untitled Film Works UK Ltd | Information & communication | 2020 |
| UP Touch Ltd | Information & communication | 2014 |
| UP Your Street Group Ltd | Real estate | 2025 |
| Upbrand Ltd | Professional & scientific | 2022 |
| Upmedicine TI Ltd | Information & communication | 2023 |
| Uppa Club Ltd | Manufacturing | 2020 |
| Upper East Hayes Management Limited | Real estate | 2012 |
| Upper Tunnel Partnership LLP | | 2024 |
| Upper WYE Valley Nature Partnership Ltd | Agriculture & fishing | 2024 |
| Upthebeanstalk Ltd | Information & communication | 2008 |
| Uptheclub Ltd | Information & communication | 2026 |
| Upton House Developments Ltd | Real estate | 2022 |
| Upton House Investments Ltd | Real estate | 2022 |
| Urban Talent Ltd | Administrative & support | 2024 |
| Urbannest Designs Ltd | Wholesale & retail | 2025 |
| Urbanpsychologist Limited | Health & social care | 2003 |
| Urbanright Residents Management Limited | Households | 1988 |
| Urbanstate Limited | Real estate | 2001 |
| Usherline Limited | Information & communication | 2004 |
| Utee Ltd | Wholesale & retail | 2026 |
| Utilis Projects Ltd | Professional & scientific | 2024 |
| Utility Legal Solutions Limited | Construction | 2025 |
| Utopiamondays Ltd | Arts & recreation | 2024 |
| Uvin Groceries Ltd | Wholesale & retail | 2022 |
| UX Agency Limited | Professional & scientific | 2011 |
| Vadher UK Ltd | Real estate | 2025 |
| Vaid & Vaid Limited | Professional & scientific | 2014 |
| Vajusol Barbers Ltd | Other services | 2019 |
| Vale Oral Care Limited | Health & social care | 2012 |
| Valenpath Systems Ltd | Information & communication | 2026 |
| Valident Limited | Information & communication | 2024 |
| Valjeune Ltd | Information & communication | 2010 |
| Value Partnership Limited | Professional & scientific | 2020 |
| Values Oriented Ltd | Professional & scientific | 2017 |
| Valvekits Limited | Manufacturing | 1996 |
| Van DER Medical Ltd | Health & social care | 2013 |
| Vanaesthesia Ltd | Health & social care | 2025 |
| Vandune Limited | Professional & scientific | 2008 |
| Vandyck Holdings Ltd | Financial services | 2015 |
| Vanequest Limited | Hospitality | 2011 |
| Vanguard Construction of Bath Ltd | Construction | 2024 |
| Vanguard Tactics Ltd | Education | 2016 |
| Vanguard Tech Solutions Ltd | Information & communication | 2023 |
| Vanguardia Limited | Professional & scientific | 2006 |
| Vanndapt Engineering Limited | Manufacturing | 2003 |
| Vanndapt Precision Engineering Limited | Manufacturing | 2025 |
| Vapoura Limited | Wholesale & retail | 2022 |
| Variostone Ltd | Construction | 2019 |
| Vasi Transx Ltd | Transport & logistics | 2024 |
| Vass of Bath Ltd | Wholesale & retail | 2015 |
| Vaylens Limited | Information & communication | 2024 |
| Vdeo Ltd | Administrative & support | 2018 |
| Vector Financial Ltd | Financial services | 2021 |
| Vectorcide International Limited | Wholesale & retail | 2015 |
| Veea Systems Ltd | Information & communication | 2014 |
| Vegetation Survey and Assessment Limited | Professional & scientific | 2010 |
| Veitch Family Holdings Limited | Professional & scientific | 1984 |
| Veitch Trading Limited | Wholesale & retail | 1973 |
| Velika Ventures Limited | Financial services | 2012 |
| Velinor AI Ltd | Information & communication | 2024 |
| Vellore Research Ltd | Professional & scientific | 2022 |
| Velora Cafe Ltd | Hospitality | 2026 |
| Velvet Belly Limited | Information & communication | 2003 |
| Velvet Skies Limited | Professional & scientific | 2020 |
| Venoir Group Ltd | Information & communication | 2026 |
| Ventbom Ltd | Information & communication | 2019 |
| Ventidue Limited | Information & communication | 2012 |
| Venture Venture LLP | | 2015 |
| Verco Advisory Services Limited | Information & communication | 1986 |
| Verrecchia Property Ltd | Real estate | 2023 |
| Vertical Horizon Hydroponics Ltd | Manufacturing | 2022 |
| Very Strange Dog Limited | Information & communication | 2007 |
| Veryfine Limited | Information & communication | 2015 |
| Vetindex Limited | Information & communication | 1995 |
| Vi-Lets Limited | Real estate | 2012 |
| Vibe Chiropractic Limited | Health & social care | 2021 |
| Vibe Fitness (UK) Ltd | Arts & recreation | 2013 |
| Viceversa Languages Ltd | Professional & scientific | 2022 |
| Victoria House Management(Bath)Co.Limited | Households | 1967 |