| TXR Cargo Ltd | Transport & logistics | 2021 |
| TY Gwyn Abersoch Limited | Hospitality | 2024 |
| Tycer Media Limited | Information & communication | 2020 |
| Tyldesley Travel Ltd | Transport & logistics | 2024 |
| Tylerson Digital Limited | Information & communication | 2026 |
| TYM Heating Ltd | Professional & scientific | 2023 |
| Tyme (UK) Ltd | Professional & scientific | 2014 |
| Tynecastle Ltd | Real estate | 2005 |
| Tyrcel Property Limited | Real estate | 2026 |
| Tyre Bay Bolton Ltd | Wholesale & retail | 2021 |
| Tyre Fitting Near ME Ltd | Wholesale & retail | 2026 |
| Tyre Kicker Transport Limited | Transport & logistics | 2024 |
| Tyrell Construction Recruitment Limited | Administrative & support | 2022 |
| Tyrer Developments Ltd | Real estate | 2024 |
| Tyres Quick Fit Ltd | Wholesale & retail | 2021 |
| Tyres Today (GB) Limited | Wholesale & retail | 2007 |
| Tyres World Limited | Administrative & support | 2021 |
| Tyresave MCR UK Ltd | Wholesale & retail | 2012 |
| Tyresave(Manchester) Ltd | Wholesale & retail | 2009 |
| Tyrewise Bolton Ltd | Wholesale & retail | 2021 |
| Tyreworx Bolton Limited | Wholesale & retail | 2026 |
| Tytbolton Ltd | Arts & recreation | 2025 |
| TZR Solutions Limited | Information & communication | 2016 |
| Tzvl Real Estate Investment Ltd | Real estate | 2022 |
| U & H Holdings Ltd | Wholesale & retail | 2025 |
| U a Electrical Ltd | Construction | 2019 |
| U ASK UK Limited | Health & social care | 2025 |
| U CAN Help CIC | Wholesale & retail | 2025 |
| U F C Fund Management PLC | Financial services | 1997 |
| U Kitchen Express Ltd | Hospitality | 2019 |
| U&E Ventures Limited | Arts & recreation | 2025 |
| U&S Clothing Ltd | Wholesale & retail | 2016 |
| U&S Property Management Ltd | Real estate | 2025 |
| U-Can Driving School Ltd | Education | 2023 |
| U-Homely Limited | Wholesale & retail | 2022 |
| U.A.Gear House and Gifts Ltd | Wholesale & retail | 2025 |
| U.Bhula Limited | Hospitality | 2019 |
| U.K. Fasteners Limited | Wholesale & retail | 1983 |
| U16GLOBAL Ltd | Health & social care | 2025 |
| U29DC Ltd | Professional & scientific | 2021 |
| U96 Limited | Manufacturing | 2020 |
| UA Accounting Ltd | Professional & scientific | 2026 |
| UA Flows Ltd | Wholesale & retail | 2025 |
| UA NW Ltd | Real estate | 2025 |
| UAA Properties Limited | Real estate | 2021 |
| Uasghar Optical Ltd | Health & social care | 2025 |
| Ubaid Nazir Bhatti Limited | Health & social care | 2014 |
| Uber Tech (Bolton) Ltd | Wholesale & retail | 2022 |
| Ubernest Stays Ltd | Real estate | 2024 |
| Ubernests Blackburn Limited | Real estate | 2021 |
| UBG Ltd | Hospitality | 2022 |
| Ubicomp Limited | Information & communication | 2022 |
| Ubiq Living Limited | Real estate | 2022 |
| Ubiquis Consulting Limited | Information & communication | 2013 |
| Ubiqutus Ltd | Manufacturing | 2018 |
| Ubuntu Property Ltd | Real estate | 2017 |
| UC Aesthetics Ltd | Health & social care | 2022 |
| Uchechris Services Limited | Health & social care | 2015 |
| Uclean DRY Cleaners Limited | Other services | 2017 |
| Ucon UK Limited | Administrative & support | 2009 |
| Ucsl (Design) Ltd | Professional & scientific | 2024 |
| Udeti Digital Limited | Wholesale & retail | 2023 |
| UEA Ltd | Real estate | 2018 |
| UEG Limited | Real estate | 2011 |
| UF Interiors Ltd | Wholesale & retail | 2025 |
| UF Property Group Ltd | Real estate | 2026 |
| UFZ Foods Ltd | Hospitality | 2022 |
| UGA Foods Ltd | Hospitality | 2026 |
| Ughradar Joinery Limited | Manufacturing | 2025 |
| Ugochris Investments Limited | Wholesale & retail | 2025 |
| UHA Traders Ltd | Wholesale & retail | 2025 |
| Uheat Properties Limited | Real estate | 2025 |
| UHS (Europe) Ltd | Wholesale & retail | 2010 |
| UHU Tours Limited | Transport & logistics | 2013 |
| UJ Smile Solutions Ltd | Health & social care | 2025 |
| UK Accounting Solution Limited | Professional & scientific | 2014 |
| UK ALI Baba Fast Food Limited | Hospitality | 2024 |
| UK and Destination Weddings Ltd | Professional & scientific | 2025 |
| UK Big Bargains Ltd | Wholesale & retail | 2017 |
| UK Blackburn RD Hand Car Wash Ltd | Wholesale & retail | 2024 |
| UK Bolton Developers Ltd | Real estate | 2023 |
| UK Business Empire Ltd | Hospitality | 2025 |
| UK Buyback Limited | Wholesale & retail | 2023 |
| UK Camel Milk Limited | Wholesale & retail | 2013 |
| UK CAN IT Limited | Manufacturing | 2018 |
| UK Capital Solutions Ltd | Professional & scientific | 2017 |
| UK Chair Frames Ltd | Wholesale & retail | 2024 |
| UK Coin Investment Limited | Hospitality | 2025 |
| UK Debt Helpers Ltd | Professional & scientific | 2026 |
| UK Dental Care Ltd | Health & social care | 2021 |
| UK Dharma Ltd | Professional & scientific | 2025 |
| UK E-Labs Ltd | Wholesale & retail | 2016 |
| UK Estates & Legal Ltd | Real estate | 2024 |
| UK Familial Pizza MCR Ltd | Hospitality | 2022 |
| UK Finance & Estates Ltd | Real estate | 2024 |
| UK Finance Online Limited | Financial services | 2002 |
| UK Fire Service Resources Ltd | Professional & scientific | 2017 |
| UK Gastronomy Wellbeing Ltd | Other services | 2025 |
| UK HDS Properties Limited | Real estate | 2025 |
| UK Health Supplements Ltd | Wholesale & retail | 2020 |