| UK Classic Garden Ltd | Other services | 2025 |
| UK Click Commerce Ltd | Wholesale & retail | 2025 |
| UK Commercial Catering Equipment Ltd | Extraterritorial | 2009 |
| UK Costumes 4U Ltd | Administrative & support | 2013 |
| UK Facility and Energy Services Ltd | Wholesale & retail | 2026 |
| UK Fashion Factory Ltd | Manufacturing | 2018 |
| UK Fast Fuel Ltd | Wholesale & retail | 2020 |
| UK Fuel Ltd | Wholesale & retail | 2008 |
| UK Manchester Ltd | Wholesale & retail | 2016 |
| UK Paintball Sports Federation Ltd | Arts & recreation | 2012 |
| UK Phoenix Factor Limited | Wholesale & retail | 2023 |
| UK Roofing Solutions Limited | Construction | 2015 |
| UK Sales Hub Ltd | Professional & scientific | 2026 |
| UK Security Bollards Ltd | Construction | 2013 |
| UK Standard Ltd | Wholesale & retail | 2022 |
| UK Transmissions Limited | Wholesale & retail | 2014 |
| UK Watan Bakery Ltd | Wholesale & retail | 2023 |
| UK Watan Bakery PVT Ltd | Wholesale & retail | 2025 |
| Ukcsl Ltd | Education | 2026 |
| Ukie Services Ltd | Health & social care | 2024 |
| UKS Staff Ltd | Administrative & support | 2022 |
| Ukvs Legal Limited | Professional & scientific | 2024 |
| Ukwide Ltd | Financial services | 2018 |
| Ultra Fashions Ltd | Wholesale & retail | 2015 |
| Ultraviolet Tanning Salon Ltd | Other services | 2023 |
| UMA Corp Ltd | Wholesale & retail | 2025 |
| Umair Travel Services Limited | Administrative & support | 2019 |
| Umaiza Limited | Wholesale & retail | 2025 |
| Umbrella Interactive Ltd | Information & communication | 2010 |
| UME Hair & Beauty Ltd | Other services | 2025 |
| Umer Chak Ltd | Wholesale & retail | 2023 |
| UMM & Co Property Ltd | Real estate | 2024 |
| UMR Future Ltd | Wholesale & retail | 2026 |
| UMZ Solutions Ltd | Professional & scientific | 2025 |
| Uncles Tea HUT Rochdale Ltd | Hospitality | 2025 |
| Underground Press Limited | Wholesale & retail | 2026 |
| Underline Agency Ltd | Professional & scientific | 2022 |
| Underworth Ltd | Education | 2000 |
| UNF Food Ltd | Hospitality | 2024 |
| Unicorn Optical Ltd | Health & social care | 2024 |
| Unified Accountax Limited | Professional & scientific | 2024 |
| Uninos Ltd | Wholesale & retail | 2022 |
| Unipro Enterprises Ltd | Hospitality | 2025 |
| Uniq PVT Ltd | Wholesale & retail | 2024 |
| Unique Aluminium Windows Limited | Construction | 2024 |
| Unique Beds Rochdale Ltd | Wholesale & retail | 2023 |
| Unique Flooring Solutions Ltd | Construction | 2015 |
| Unique Network Solutions Ltd | Construction | 2019 |
| United Appliances Ltd | Wholesale & retail | 2021 |
| United Forecourt Limited | Wholesale & retail | 2008 |
| United Homes PVT Ltd | Real estate | 2024 |
| United Locksmiths Ltd | Other services | 2023 |
| United Medical Systems Ltd | Manufacturing | 2016 |
| United Petroleum UK Limited | Wholesale & retail | 2008 |
| United Springs Limited | Manufacturing | 2000 |
| Unity House Productions Ltd | Information & communication | 2017 |
| Unity Marketing Agency Ltd | Wholesale & retail | 2020 |
| Unity Mill Developments Limited | Construction | 2013 |
| Universal (NW) Ltd | Wholesale & retail | 2022 |
| Universal Alloys Ltd | Wholesale & retail | 2017 |
| Universal Brands Holdings Limited | Financial services | 2023 |
| Universal Dealers Ltd | Wholesale & retail | 2011 |
| Universal Enterprises MCR Ltd | Education | 2026 |
| Universal Translation Services Ltd | Professional & scientific | 2025 |
| Unleash (AA) Ltd | Wholesale & retail | 2020 |
| Unorthodoxx Ltd | Wholesale & retail | 2018 |
| UP Healthcare Services Ltd | Health & social care | 2023 |
| UP the Cobbles Ltd | Hospitality | 2024 |
| UP the Score Ltd | Extraterritorial | 2024 |
| Upchamp Ltd | Wholesale & retail | 2024 |
| Uper Crust Limited | Hospitality | 2024 |
| UPP Photographic Ltd | Other services | 2023 |
| Upper Craust Ltd | Hospitality | 2018 |
| Upper East Side Tanning and Beauty Ltd | Other services | 2022 |
| Upperr Crust Ltd | Hospitality | 2026 |
| UPS Battery Installation and Maintenance Ltd | Construction | 2026 |
| Uptodatefashion Ltd | Wholesale & retail | 2024 |
| Uptown Luxury Car Rentals Ltd | Administrative & support | 2024 |
| Uptrend Shopping Ltd | Wholesale & retail | 2025 |
| UR Auto Care Star Ltd | Wholesale & retail | 2024 |
| Urban Beads Ltd | Wholesale & retail | 2026 |
| Urban Beauty Outlet Limited | Wholesale & retail | 2022 |
| Urban Cruz Xpress Ltd | Transport & logistics | 2020 |
| Urban Haus Design Studio Ltd | Construction | 2016 |
| Urban Maintenance Solutions Ltd | Construction | 2019 |
| Urban Roofing & Developments Ltd | Construction | 2023 |
| Urban Soul Design Limited | Administrative & support | 2003 |
| Urban Sports Ventures Ltd | Real estate | 2026 |
| Urban View SKD Limited | Real estate | 2024 |
| Urbannova Ltd | Wholesale & retail | 2026 |
| Urbantow Solutions Ltd | Transport & logistics | 2025 |
| Urmston Cafe Ltd | Hospitality | 2024 |
| Uroandrol Services Ltd | Health & social care | 2010 |
| Urooj Ltd | Extraterritorial | 2020 |
| USM Engineering and Consulting Ltd | Professional & scientific | 2026 |
| USM Living Ltd | Wholesale & retail | 2026 |
| Usmaan Qayyum EYE Care Ltd | Administrative & support | 2017 |
| Utility Saving Solutions Limited | Administrative & support | 2018 |
| Utility Provida Communications Ltd | Information & communication | 2017 |
| UTR Property Management Ltd | Real estate | 2023 |