| Trueglambeauty Ltd | Other services | 2019 |
| Truehome Engineering Ltd | Other services | 2026 |
| Truewatt Electrical Ltd | Construction | 2025 |
| Trunk Facilities Limited | Construction | 2022 |
| Trunk Fire and Security Limited | Administrative & support | 2020 |
| Trunk Holdings Limited | Real estate | 2022 |
| Trunk Logistics Limited | Transport & logistics | 2019 |
| Trusted Keys Properties Ltd | Real estate | 2019 |
| Trustpoint Services Ltd | Wholesale & retail | 2025 |
| Trustwood Ltd | Construction | 2011 |
| Trykon Limited | Professional & scientific | 2024 |
| TS Intelligence Ltd. | Transport & logistics | 2016 |
| TS Team Limited | Transport & logistics | 2011 |
| Tsiv Properties Ltd | Real estate | 2026 |
| Tslk Ltd | Wholesale & retail | 2010 |
| TSN Investments Limited | Real estate | 2018 |
| Tsolace Ltd | Wholesale & retail | 2025 |
| TSP Construction 74 Ltd | Construction | 2017 |
| TSP Swift Logistics Ltd | Transport & logistics | 2024 |
| TT Autotrader Ltd | Wholesale & retail | 2025 |
| TTA Housing CIC | Real estate | 2023 |
| TTC Global Ltd | Professional & scientific | 2022 |
| Ttfc Essex Limited | Construction | 2009 |
| Ttfi Security and Logistics Ltd | Financial services | 2020 |
| Ttnb Properties Ltd | Real estate | 2025 |
| TTZ Group UK Ltd | Hospitality | 2025 |
| TUA Castelli Ltd | Real estate | 2025 |
| Tuco Constructions Limited | Manufacturing | 2024 |
| Tudor Court (Grays) Limited | Households | 2015 |
| Tudor Court Primary Academy Trust | Education | 2014 |
| Tuktuk Panasia Ltd | Hospitality | 2021 |
| Tulicka Ltd | Wholesale & retail | 2025 |
| Turcan Limited | Transport & logistics | 2021 |
| Turnstile Corporate Limited | Administrative & support | 2018 |
| Turtleyawesomephotography Ltd | Professional & scientific | 2025 |
| Tutz Logistics Ltd | Transport & logistics | 2026 |
| Tutz Trans Services Ltd | Transport & logistics | 2024 |
| Twardy Delivery Limited | Transport & logistics | 2016 |
| TWD Healthcare Consultancy Limited | Health & social care | 2018 |
| Twelve Grains Ltd | Manufacturing | 2008 |
| Twincrafted Ltd | Manufacturing | 2026 |
| Two Laughing Seagulls Ltd | Extraterritorial | 2022 |
| TY & LW Sales Ltd | Wholesale & retail | 2024 |
| Tyreserv Global Limited | Manufacturing | 2015 |
| Tyto Afrifresh Foods Ltd | Wholesale & retail | 2026 |
| Tyvn Ltd | Construction | 2025 |
| Tzaga Logistic Ltd | Transport & logistics | 2014 |
| TZH Consulting Ltd | Information & communication | 2020 |
| U-Turnships CIC | Professional & scientific | 2020 |
| UA Team Ltd | Construction | 2023 |
| Uarf Properties Ltd | Real estate | 2024 |
| Ubeyond Limited | Information & communication | 2015 |
| Uddin Holdings Limited | Financial services | 2021 |
| Uddin Property Holdings Ltd | Real estate | 2025 |
| Udrive Motors Limited | Wholesale & retail | 2016 |
| Ugomic Global Services Ltd | Construction | 2023 |
| Uguray Limited | Hospitality | 2019 |
| UK AM Interiors Ltd | Construction | 2015 |
| UK Clothing Caravan Limited | Wholesale & retail | 2011 |
| UK Community College - Limited | Education | 2010 |
| UK EMT Ltd | Education | 2018 |
| UK Express Haulage Ltd | Transport & logistics | 2021 |
| UK Food Concepts Ltd | Wholesale & retail | 2019 |
| UK Impressions Ltd | Wholesale & retail | 2019 |
| UK Martial Arts World Limited | Arts & recreation | 2025 |
| UK Refinish Supplies Ltd | Wholesale & retail | 2025 |
| UK Skills College | Education | 2025 |
| UK SME Energy Renewals Limited | Professional & scientific | 2019 |
| UK WAX Seals Limited | Manufacturing | 2014 |
| UK Woodcraft Ltd | Construction | 2003 |
| Uk-Gh Essentials Ltd | Wholesale & retail | 2026 |
| Ukid Accountancy & Tax Associates Limited | Professional & scientific | 2020 |
| Ukprofix Ltd | Construction | 2026 |
| Ukroadrunner Limited | Wholesale & retail | 2013 |
| Ultimate Choice Bathrooms & Kitchens LLP | | 2019 |
| Ultra Cyber Networks Ltd | Information & communication | 2026 |
| Umabatha International Limited | Information & communication | 2018 |
| Ummah Mission Ltd | Health & social care | 2024 |
| Umunumo Progressive Union UK Ltd | Other services | 2025 |
| Unaas Consultants (UK) Limited | Information & communication | 2011 |
| Unbar Investments Limited | Real estate | 2021 |
| Under the Needle Ltd | Other services | 2022 |
| Underfloor Heating Expert Ltd | Construction | 2023 |
| Underground Allure Ltd | Wholesale & retail | 2023 |
| Unick Healthcare Limited | Health & social care | 2021 |
| Unidays Consultants Limited | Information & communication | 2020 |
| Unique Experiences (Paris) Limited | Transport & logistics | 2023 |
| Unique Interiors & Construction Ltd | Construction | 2019 |
| Unique IT Technologies Ltd | Information & communication | 2021 |
| Unique Step UK Ltd | Health & social care | 2023 |
| Uniquick Limited | Professional & scientific | 2010 |
| Uniquick Properties Limited | Real estate | 2021 |
| Unite Highland Care Limited | Health & social care | 2021 |
| United Care Medical Supplies Ltd | Wholesale & retail | 2026 |
| United Chicken Station Limited | Hospitality | 2017 |
| United Laser Clinic Ltd | Other services | 2023 |
| Unitedwoody Ltd | Construction | 2018 |
| Unity Furniture Limited | Manufacturing | 2025 |
| Unity Youth Development CIC | Education | 2026 |
| Unity&Thomas Ltd | Transport & logistics | 2018 |