| UK Property Solutions (the White House) Limited | Real estate | 2024 |
| UK Property Sourcing Limited | Real estate | 2017 |
| UK Supermarket Limited | Wholesale & retail | 2024 |
| UKD Apparel & Accessories Ltd | Administrative & support | 2024 |
| Ukea Properties Ltd | Real estate | 2017 |
| Ukmd Limited | Professional & scientific | 2001 |
| Ukraine UK Unity CIC | Health & social care | 2022 |
| Ukstarlights Ltd | Professional & scientific | 2020 |
| Ultimate Salon Supplies Limited | Wholesale & retail | 2026 |
| Ultimax Healthcare Limited | Health & social care | 2025 |
| Ultra Composites Limited | Professional & scientific | 2016 |
| Ultra High Frequency Limited | Information & communication | 2022 |
| Umairical Ltd | Wholesale & retail | 2026 |
| UME Restaurant Ltd | Hospitality | 2008 |
| Ummeey Ltd | Wholesale & retail | 2026 |
| UMS Property Limited | Administrative & support | 1992 |
| Unbox Studio Limited | Professional & scientific | 2023 |
| Undeniable Group Ltd | Professional & scientific | 2024 |
| Unexplored Group Ltd | Administrative & support | 2023 |
| Unichrome Creative Limited | Professional & scientific | 1996 |
| Unified Receipt Ltd | Information & communication | 2024 |
| Union Project Development (UK) Ltd | Administrative & support | 2022 |
| Uniploy Developments Limited | Professional & scientific | 1962 |
| United Hire Ltd | Administrative & support | 2019 |
| United Travel Services Ltd | Transport & logistics | 2024 |
| Universal Management & Security Services Limited | Administrative & support | 2019 |
| Unopa Care Limited | Public administration | 2019 |
| UNR Food Limited | Hospitality | 2020 |
| Unrepresented Sports Ltd | Arts & recreation | 2024 |
| Unspacely Film Ltd | Information & communication | 2020 |
| UP Creative Consultants Limited | Professional & scientific | 2012 |
| UP Ventures Ltd | Other services | 2023 |
| UP! for Changing Ltd | Administrative & support | 2023 |
| Upfix Drylining Ltd | Construction | 2023 |
| Upper Grove Limited | Households | 2024 |
| Urav Catering Limited | Hospitality | 2020 |
| Urban Carnivore Limited | Hospitality | 2025 |
| Urban Fern Limited | Construction | 2007 |
| Urban Greens Limited | Administrative & support | 2004 |
| Urban Residency Ltd | Real estate | 2019 |
| Urban Roofing and Property Maintenance Limited | Construction | 2019 |
| Urban Sky Mortgages Limited | Financial services | 2019 |
| Urban Switch Ltd | Real estate | 2002 |
| Urban X-It Limited | Other services | 2006 |
| Urbanly Ltd | Wholesale & retail | 2026 |
| Urbanvault Property Ltd | Real estate | 2026 |
| UT Tax Ltd | Information & communication | 2018 |
| UTA Investments Ltd | Real estate | 2021 |
| Utility Installation Consultancy UK Ltd | Energy | 2023 |
| UUK ERP Consulting Ltd | Information & communication | 2015 |
| UV1 Limited | Other services | 2023 |
| V & a Cottage Ltd | Real estate | 2017 |
| V & S Property Development Limited | Construction | 2010 |
| V Greenwood Ltd | Real estate | 2022 |
| V&M Logistics Ltd | Other services | 2014 |
| V-Elect Ltd | Construction | 2014 |
| V1B3 Investments Limited | Real estate | 2018 |
| V3B1 Investments LLP | | 2025 |
| V4 Woodflooring Limited | Wholesale & retail | 2002 |
| Vaayu Tech Ltd | Information & communication | 2023 |
| Vactite Limited | Professional & scientific | 1919 |
| Vail Luton Limited | Information & communication | 2014 |
| Vaince Properties Limited | Households | 2010 |
| Valarion Strategy Ltd | Professional & scientific | 2026 |
| Valemonte Partners Ltd | Administrative & support | 2025 |
| Valentine Barn Limited | Agriculture & fishing | 2013 |
| Valentine Farm Ripley Limited | Real estate | 2022 |
| Valentino Schoolwear Limited | Extraterritorial | 2012 |
| Valley END Cricket Club | Arts & recreation | 2012 |
| Van ZYL IT Services Limited | Information & communication | 2010 |
| Vanity House Beauty Ltd | Other services | 2016 |
| Vansgate Ltd | Administrative & support | 2018 |
| Vanstone Accountants Ltd | Professional & scientific | 2019 |
| Vantage Framework DAL 8 Ltd | Administrative & support | 2025 |
| Vapestore Basingstoke Ltd | Administrative & support | 2018 |
| Vario Partners LLP | | 2013 |
| Varluw Ltd | Professional & scientific | 2023 |
| Vatasha Limited | Transport & logistics | 2025 |
| Vatma Ltd | Professional & scientific | 2018 |
| Vaughan IP Holdings Limited | Administrative & support | 2017 |
| Vazaro Ltd | Information & communication | 2026 |
| VC Creative Limited | Wholesale & retail | 2022 |
| VCG Trans Ltd | Transport & logistics | 2025 |
| VCM Limited | Households | 2019 |
| Vconnect Solutions Limited | Information & communication | 2011 |
| VDK Capital Ltd | Financial services | 2020 |
| Veakins Medical Ltd | Health & social care | 2026 |
| Veba Holdings Limited | Financial services | 2025 |
| Veba Hounslow Limited | Hospitality | 2025 |
| Veba Staines Limited | Hospitality | 2025 |
| Veba Waterloo Limited | Hospitality | 2021 |
| Veban Ltd | Real estate | 2025 |
| VEE Connect Ltd | Information & communication | 2025 |
| Velocity Electrical Surrey Ltd | Construction | 2020 |
| Velocity Executive Cars Ltd | Transport & logistics | 2019 |
| Velocity Vehicle Hire Ltd | Other services | 2025 |
| Veloxja Ltd | Wholesale & retail | 2026 |
| Velvet Joy Productions Limited | Information & communication | 2010 |
| Velvet Revival Community Interest Company | Wholesale & retail | 2025 |
| Velvet Viper Media Ltd | Professional & scientific | 2025 |