| Ty-Gwyn Medical Limited | Professional & scientific | 2013 |
| Tyldesley Decorators Ltd. | Construction | 2017 |
| Tyme Engineering Ltd | Professional & scientific | 2011 |
| Tyne Bros Limited | Real estate | 2025 |
| Tyne Group Ltd | Professional & scientific | 2025 |
| Tyreforce NW Limited | Real estate | 2002 |
| Tyres (South Shore) Limited | Wholesale & retail | 1963 |
| U Grow Hydroponics Limited | Wholesale & retail | 2017 |
| Uaea Consultancy Limited | Information & communication | 2014 |
| Uccello Hair and Beauty Ltd | Other services | 2025 |
| Uflow Ltd | Wholesale & retail | 2020 |
| Ugur Yachting Ltd | Extraterritorial | 2023 |
| UK Aguilas Limited | Professional & scientific | 2014 |
| UK Asia Limited | Wholesale & retail | 2017 |
| UK Assets Management Ltd | Real estate | 2023 |
| UK by Coach Ltd | Transport & logistics | 2020 |
| UK Data Science & Analytics Company Ltd | Information & communication | 2021 |
| UK Debt Management Ltd | Administrative & support | 2026 |
| UK DPF Ltd | Administrative & support | 2020 |
| UK Eateries Ltd | Hospitality | 2024 |
| UK Energy Experts Ltd | Financial services | 2022 |
| UK Group Holding Ltd | Administrative & support | 2022 |
| UK Jupiter Asset Management Ltd | Wholesale & retail | 2024 |
| UK Leisure Online Limited | Administrative & support | 2009 |
| UK Materials Hub Ltd | Wholesale & retail | 2025 |
| UK Neurostroke Limited | Professional & scientific | 2023 |
| UK Payments Ltd | Information & communication | 2024 |
| UK Ride Ltd | Arts & recreation | 2018 |
| UK Road Repairs Limited | Construction | 2026 |
| UK Sash Company Ltd | Manufacturing | 2026 |
| UK Social Care Limited | Health & social care | 2018 |
| UK Travel and Hospitality Ltd | Hospitality | 2020 |
| UK Vans & Cars Ltd | Wholesale & retail | 2022 |
| UK Watch Technologies Ltd | Administrative & support | 2016 |
| Ukadance Ltd | Other services | 1973 |
| Ukholdingskhan Limited | Real estate | 2024 |
| Ukmapguide Limited | Information & communication | 2021 |
| Ulok Ltd | Transport & logistics | 2021 |
| Ulok NW Ltd | Transport & logistics | 2026 |
| Ultimate Electrics Ltd | Construction | 2022 |
| Ultimate Nutrio Ltd | Extraterritorial | 2016 |
| Ultimate Nutrition Limited | Wholesale & retail | 1987 |
| Ultimate Nutrition Worldwide Ltd | Wholesale & retail | 2013 |
| Ultimate Pro Coaching Ltd | Arts & recreation | 2026 |
| Ultrasud Limited | Extraterritorial | 2026 |
| Umbra Utopia Limited | Professional & scientific | 2024 |
| Umdj Limited | Health & social care | 2023 |
| UNA (Blackpool) Ltd | Households | 2022 |
| Unbranded Holdings Limited | Financial services | 2020 |
| Underground ALT Ltd | Hospitality | 2026 |
| Underlay Direct Limited | Wholesale & retail | 2023 |
| Unicor Ltd | Administrative & support | 2022 |
| Unicorn Accountancy Ltd | Professional & scientific | 2014 |
| Unicorn Software Developments Ltd | Information & communication | 2018 |
| Unified Minds Ltd | Other services | 2022 |
| Unimedia Global Ltd | Information & communication | 2023 |
| Uninutrition Ltd | Health & social care | 2021 |
| Union of London Ltd | Arts & recreation | 2023 |
| Unique Access Solutions Limited | Professional & scientific | 2022 |
| Unique Advertising Limited | Professional & scientific | 2016 |
| Unique Arts & Interiors Ltd | Wholesale & retail | 2019 |
| Unique Contrax Limited | Construction | 2019 |
| Unique Nails and Spa Ltd | Other services | 2024 |
| Unique Stage Productions Ltd | Arts & recreation | 2020 |
| Unique Training Group Ltd | Education | 2020 |
| Unit Italia Limited | Hospitality | 2020 |
| Unite Care & Support Services Limited | Health & social care | 2023 |
| United Electrica Ltd | Financial services | 2025 |
| United Koconut Ltd | Hospitality | 2025 |
| United Living Limited | Construction | 2024 |
| United Youth Alliance C.I.C. | Professional & scientific | 2018 |
| Universal Freedom Network Ltd | Energy | 2022 |
| Unlimit the Limited | Information & communication | 2006 |
| Unsworth Developments Limited | Construction | 2022 |
| Unvi BUS & Coach Limited | Wholesale & retail | 2009 |
| UP2GO Ltd | Construction | 2023 |
| Uppalinternational Ltd | Professional & scientific | 2020 |
| Upper Fulton Ltd | Wholesale & retail | 2025 |
| UPS Protect Limited | Information & communication | 2015 |
| Upsco Europe Limited | Professional & scientific | 2008 |
| Urban Factory Limited | Wholesale & retail | 2017 |
| Urban Inn Blackpool Holdings Limited | Hospitality | 2026 |
| Urban Inn Blackpool Limited | Hospitality | 2023 |
| Urban Inn Holdings Limited | Hospitality | 2022 |
| Urban Landscaping Limited | Administrative & support | 2012 |
| Urban Munchtime Limited | Hospitality | 2024 |
| Urban Surveillance Ltd | Administrative & support | 2006 |
| Urban Technology Solutions Limited | Construction | 2022 |
| Urban Virtue Ltd | Construction | 2025 |
| Urchin Labs Ltd | Information & communication | 2020 |
| Urgent Dental Services (NW) Limited | Extraterritorial | 2019 |
| Ursafe Ltd | Wholesale & retail | 2019 |
| Usuk Consultants Ltd | Professional & scientific | 2021 |
| Utility Collections Ltd | Administrative & support | 2017 |
| Utility Save Ltd | Administrative & support | 2026 |
| Utility Swopshop Ltd | Professional & scientific | 2015 |
| Uvavu Limited | Real estate | 2022 |
| Uwrap Limited | Administrative & support | 2010 |
| V L Service Stations Ltd | Wholesale & retail | 2025 |
| V V N Grooming Ltd | Other services | 2025 |