| Transport Infrastructure Solutions Ltd | Construction | 2022 |
| Travel the World 2 LLP | | 2010 |
| Travis Equine Limited | Agriculture & fishing | 2020 |
| Traxsion Ltd | Administrative & support | 2022 |
| TRB Consultancy Limited | Professional & scientific | 2005 |
| Treasure Cave Ltd | Wholesale & retail | 2017 |
| Treatme Limited | Hospitality | 2025 |
| Treeline Developments Ltd | Construction | 2010 |
| Trentham Boat Club | Arts & recreation | 2017 |
| Trentham Watersports Association | Arts & recreation | 2008 |
| Tri-R Ventures Limited | Real estate | 2025 |
| Trident Domestic and Commercial GAS Services LLP | | 2012 |
| Trids GAS and Plumbing Ltd | Construction | 2026 |
| Trids Ltd | Real estate | 2026 |
| Trimsense Limited | Other services | 2024 |
| Trinity Cables International Ltd | Manufacturing | 2007 |
| Trinity Therapy & Rehabilitation Ltd | Health & social care | 2020 |
| Triple Future Limited | Financial services | 2015 |
| Triple Pillar Limited | Construction | 2014 |
| Triple Sixx Tattoo Asylum Ltd | Arts & recreation | 2025 |
| True Films Limited | Information & communication | 2011 |
| True Lens Art Ltd | Information & communication | 2026 |
| True Path Collective Ltd | Professional & scientific | 2021 |
| Truenorth SM Ltd | Health & social care | 2025 |
| Truestrike Golf Limited | Administrative & support | 2026 |
| Trusted Ground Services Limited | Administrative & support | 2021 |
| Trustfleet Ltd | Transport & logistics | 2025 |
| Tryitfirst Ltd | Wholesale & retail | 2024 |
| TS & I Limited | Hospitality | 2025 |
| Tsar Consultancy Limited | Professional & scientific | 2011 |
| Tshirtify Limited | Information & communication | 2017 |
| TTH Core Holdings 2 Limited | Financial services | 2026 |
| TTH Core Holdings Limited | Financial services | 2025 |
| Tubesonic Limited | Real estate | 1999 |
| Tumble and Fall Limited | Arts & recreation | 2006 |
| Tundra Trans Ltd | Transport & logistics | 2019 |
| Turcil 2 Limited | Transport & logistics | 2024 |
| Turn Therapy Ltd | Other services | 2020 |
| Tutty LEO Bites Ltd | Hospitality | 2025 |
| Tuzis Ltd | Other services | 2025 |
| TVC Motor Ltd | Wholesale & retail | 2025 |
| TVK Construction Ltd | Construction | 2026 |
| TW Agri Limited | Agriculture & fishing | 2026 |
| Twenty Three Fifty Studios Ltd | Information & communication | 2025 |
| Twenty Two Mktg. Ltd | Professional & scientific | 2023 |
| TWG Europe Limited | Financial services | 2009 |
| TWG Services Limited | Financial services | 1985 |
| Twinkle Star Day Nursery Ltd | Education | 2010 |
| Two Wheeled Classics Ltd | Wholesale & retail | 2012 |
| Two Winds Consulting Ltd | Professional & scientific | 2019 |
| TWR Training Limited | Education | 2013 |
| Twztd Limited | Arts & recreation | 2024 |
| TY Morgans Limited | Hospitality | 2014 |
| Tyga.Cloud Ltd | Information & communication | 2023 |
| Tyler's Hoof Products Ltd | Wholesale & retail | 2024 |
| Tyre REX Holdings Ltd | Financial services | 2026 |
| Tyrer Law Limited | Professional & scientific | 2010 |
| Tzakt Services Limited | Wholesale & retail | 2020 |
| U.K. Toy and Model Auctions Limited | Wholesale & retail | 1996 |
| U.T.C. Management Limited | Arts & recreation | 2012 |
| UA Play Ltd | Arts & recreation | 2024 |
| Ubasinachi Services Limited | Health & social care | 2023 |
| Uberholz Ltd | Manufacturing | 2025 |
| UIC Consultancy Ltd | Professional & scientific | 2016 |
| UIC Systems Ltd | Information & communication | 2015 |
| UK Commercial Transport Services Ltd | Transport & logistics | 2023 |
| UK Data Group Ltd | Information & communication | 2021 |
| UK Fuels Limited | Wholesale & retail | 1988 |
| UK Greenwich Company Ltd | Administrative & support | 2023 |
| UK Precision Movement Ltd | Arts & recreation | 2017 |
| UK Premier Furnishings Limited | Wholesale & retail | 2015 |
| UK RG Management Limited | Real estate | 2022 |
| UK Skills Training Ltd | Information & communication | 2024 |
| UK Telematics Limited | Information & communication | 2001 |
| UK Transport & Logistics Group Limited | Financial services | 2021 |
| UK United Styles Ltd | Other services | 2025 |
| Ukpu Developments Ltd | Real estate | 2020 |
| Ultimate Horsemanship Ltd | Information & communication | 2025 |
| Ultra Clean (Crewe) Ltd | Administrative & support | 2026 |
| Ultra Property Solutions Ltd | Construction | 2026 |
| Unbreakable Ltd | Wholesale & retail | 2018 |
| Undivided & Co Ltd | Other services | 2014 |
| Undivided Group Ltd | Other services | 2020 |
| Uniontech UK Limited | Professional & scientific | 2003 |
| Unique Hair Academy Limited | Other services | 2021 |
| Unit Trans Ltd | Transport & logistics | 2025 |
| United Chip Company Limited | Hospitality | 2006 |
| United Cusine Ltd | Hospitality | 2026 |
| United Inc Ltd | Information & communication | 2024 |
| Universal Global Traders Limited | Wholesale & retail | 2013 |
| Universal Leader Limited | Professional & scientific | 2008 |
| Unizarre International Film & TV Productions Limited | Information & communication | 2005 |
| Unmasked Technology Limited | Information & communication | 2024 |
| UP and Under Foundation | Other services | 2007 |
| Upwright Developments & Property Services Ltd | Construction | 2016 |
| Urban Automation Ltd | Construction | 2022 |
| Urban Landscapes Limited | Administrative & support | 2025 |
| US One Records Limited | Information & communication | 2025 |
| Usman Wonila Shop Ltd | Wholesale & retail | 2025 |
| Utility Components Ltd | Manufacturing | 2014 |