| Uman Traders Ltd | Wholesale & retail | 2025 |
| Umar Transport Ltd | Transport & logistics | 2023 |
| Umar Yaqub Limited | Professional & scientific | 2025 |
| Umatech Limited | Professional & scientific | 2011 |
| Umbrella Clothing Ltd | Wholesale & retail | 2019 |
| Umbrella Group of Agents Limited | Administrative & support | 2017 |
| Umbrella Legal Limited | Professional & scientific | 2004 |
| UME Suites Ltd | Real estate | 2024 |
| Umeed KI Kiran Ltd | Health & social care | 2021 |
| Umega Solutions Limited | Information & communication | 2025 |
| Umer ALI Ltd | Health & social care | 2021 |
| Umera Iqbal Ltd | Health & social care | 2016 |
| UMI Homes Limited | Households | 2024 |
| Umma Group Ltd | Wholesale & retail | 2026 |
| Ummerawha Ltd | Wholesale & retail | 2026 |
| Umniahiba Ltd | Real estate | 2026 |
| UMQ Zone Limited | Wholesale & retail | 2025 |
| UMR Holdings Ltd | Real estate | 2022 |
| UMU Limited | Wholesale & retail | 2022 |
| Umur Farooq Properties Ltd | Real estate | 2026 |
| UN Healthcare Limited | Health & social care | 2025 |
| UN Transport Ltd | Transport & logistics | 2024 |
| UNA Armarium Ltd | Health & social care | 2012 |
| UNA Sana Transport Ltd | Transport & logistics | 2024 |
| Unbranded Digital Ltd | Professional & scientific | 2015 |
| Uncommitted Photography Ltd | Professional & scientific | 2026 |
| Uncover the World Limited | Administrative & support | 2005 |
| Uncover the World Travel Ltd. | Professional & scientific | 2011 |
| Undercliffe Food & Wine Ltd | Wholesale & retail | 2024 |
| Undercliffe Road Management Company Limited | Real estate | 2002 |
| Undercliffe Service Station Ltd | Transport & logistics | 2023 |
| Underhooks MMA Ltd | Arts & recreation | 2026 |
| Underwater Heritage Trust | Arts & recreation | 1992 |
| Undisputed at Logistics Limited | Administrative & support | 2024 |
| Undisputed BFD Ltd | Hospitality | 2023 |
| Uneek Construction & Development Limited | Real estate | 2013 |
| Uneek Freeman Street Limited | Real estate | 2022 |
| Uneek Homes Real Estate Limited | Real estate | 2018 |
| Unexco Limited | Wholesale & retail | 2016 |
| Unfold Limited | Wholesale & retail | 2026 |
| UNI Fisheries Limited | Hospitality | 2018 |
| Uniadmi Ltd | Education | 2024 |
| Uniexpress Group Limited | Financial services | 2015 |
| Uniexpress Holdings Limited | Financial services | 2020 |
| Uniexpress Limited | Administrative & support | 1986 |
| UNIFIED7 Ltd | Transport & logistics | 2026 |
| Uniform Response Services Ltd | Administrative & support | 2022 |
| Unijig Limited | Manufacturing | 2005 |
| Unik Biotherapeutics Ltd | Manufacturing | 2025 |
| Uniliv Accommodation Limited | Hospitality | 2023 |
| Union Works London Ltd | Construction | 2025 |
| Unipack Solutions Ltd | Administrative & support | 2024 |
| Unique Build Solutions Ltd | Construction | 2024 |
| Unique Car Care (Bradford) Limited | Wholesale & retail | 2016 |
| Unique Catering Equipment Ltd | Manufacturing | 2019 |
| Unique Construere Limited | Construction | 2019 |
| Unique Cuts 2022 Ltd | Other services | 2022 |
| Unique Fabrication Limited | Manufacturing | 2020 |
| Unique Food Machinery Ltd | Manufacturing | 2015 |
| Unique Furnishings Ltd | Wholesale & retail | 2017 |
| Unique Home Gift Ltd | Wholesale & retail | 2024 |
| Unique Images Limited | Extraterritorial | 1962 |
| Unique Installs (Yorkshire) Limited | Wholesale & retail | 2019 |
| Unique Number Plates & Signs Ltd | Manufacturing | 2020 |
| Unique Property Development Ltd | Real estate | 2025 |
| Unique Recovery & Breakdown Ltd | Wholesale & retail | 2021 |
| Unique Shopping Online Limited | Wholesale & retail | 2024 |
| Unique Spice Ltd | Hospitality | 2026 |
| Unique Transport Limited | Transport & logistics | 2025 |
| Uniquefit Interiors Ltd | Construction | 2011 |
| Uniscot Limited | Wholesale & retail | 2024 |
| Unit 3 Compliance Ltd | Professional & scientific | 2017 |
| Unit 6 Ford Park Limited | Real estate | 2025 |
| Unit SIX Performance & Detailing Ltd | Professional & scientific | 2026 |
| United Brickwork Ltd | Construction | 2026 |
| United Car Hire Ltd | Administrative & support | 2017 |
| United Courier (North) Limited | Transport & logistics | 2022 |
| United Foods Wholesale Limited | Extraterritorial | 2018 |
| United General Limited | Financial services | 2018 |
| United Labs Limited | Wholesale & retail | 2021 |
| United Properties Yorkshire Limited | Real estate | 2022 |
| United Stars Ltd | Wholesale & retail | 2026 |
| United Supply Ltd | Transport & logistics | 2023 |
| United Wholesale Supplies Limited | Wholesale & retail | 2026 |
| Uniting Hearts CIC | Education | 2025 |
| Unitracker (Worldwide) Ltd | Manufacturing | 2023 |
| Unitracker Ltd | Manufacturing | 2016 |
| Unity Builders West Yorkshire C.I.C. | Education | 2021 |
| Unity Convenience Store - Heywood Limited | Wholesale & retail | 2025 |
| Unity Fitness Ltd | Arts & recreation | 2018 |
| Unity in the Community West Yorkshire CIC | Education | 2025 |
| Unity Sound Collective CIC | Information & communication | 2025 |
| Univar Europe Limited | Professional & scientific | 1973 |
| Univar Solutions Cd&S UK Limited | Wholesale & retail | 2025 |
| Univar Solutions Trustee Limited | Financial services | 2021 |
| Univar Solutions UK Holdco Limited | Administrative & support | 2023 |
| Univar Solutions UK Limited | Wholesale & retail | 1915 |
| Univar UK Limited | Administrative & support | 2000 |
| Universal Agility Limited | Arts & recreation | 2020 |
| Universal Bar Installation Ltd | Construction | 2021 |