| Top Access Ltd | Professional & scientific | 2023 |
| Top Red International Co., Ltd | Wholesale & retail | 2008 |
| Topco 8787 Limited | Professional & scientific | 2019 |
| Topele Enterprise Co., Ltd | Extraterritorial | 2010 |
| Topol M Limited | Transport & logistics | 2025 |
| Torpedo Production Limited | Manufacturing | 2012 |
| Total Recall Videos Limited | Information & communication | 2014 |
| Total Spectrum Limited | Administrative & support | 2024 |
| Total Weighing Solutions Limited | Professional & scientific | 2015 |
| Totalsim CFD Ltd | Information & communication | 2021 |
| Tove Valley Veterinary Services Limited | Professional & scientific | 2021 |
| Towcester Tile Centre Limited | Wholesale & retail | 2006 |
| TQI Online Ltd | Information & communication | 2025 |
| TR Enterprising Ltd | Construction | 2015 |
| TR1TECH Ltd | Professional & scientific | 2020 |
| Trade Stone Factory Ltd | Manufacturing | 2021 |
| Trademate (UK) Ltd. | Other services | 1997 |
| Training and Life Skills Ltd | Education | 2024 |
| Trajan Group Limited | Financial services | 2024 |
| Trajan Holdings Limited | Financial services | 2024 |
| Trajan Properties Limited | Real estate | 2022 |
| Trajan Ventures Limited | Financial services | 2023 |
| Trans Rapid Ltd | Transport & logistics | 2019 |
| Transmary Limited | Transport & logistics | 2014 |
| Transport Milan Limited | Other services | 2018 |
| Transporter Daventry LP | | 2017 |
| Transpro Products Limited | Wholesale & retail | 2012 |
| Tresura Ltd | Wholesale & retail | 2023 |
| Triboi Prim Ltd | Transport & logistics | 2019 |
| Trilby Escape Rooms Limited | Other services | 2025 |
| Trilogy Consultants Ltd | Real estate | 2022 |
| Trilogy Flooring Ltd | Construction | 2021 |
| Trilogy Property Acquisitions Limited | Professional & scientific | 2009 |
| Trinkets & Treasures Ltd | Wholesale & retail | 2023 |
| Trippi Ltd | Information & communication | 2026 |
| Trivow Group Limited | Wholesale & retail | 2015 |
| Trivow Resells Ltd | Wholesale & retail | 2020 |
| True-Sash Carpentry and Joinery Ltd | Construction | 2016 |
| Tsgamertag Limited | Information & communication | 2025 |
| Ttco International Limited | Professional & scientific | 2010 |
| Tube Direct Ltd | Administrative & support | 2016 |
| Tubecraft Ltd | Manufacturing | 2024 |
| Turboco Investments Limited | Financial services | 2025 |
| Turbocomposite Limited | Manufacturing | 2024 |
| Turkish Barber Salon Limited | Other services | 2020 |
| Two C'S Properties Limited | Real estate | 2018 |
| Two Sides Limited | Other services | 2010 |
| TWO4SEVEN Marketing Ltd | Professional & scientific | 2024 |
| Twynhams Tours Limited | Administrative & support | 2020 |
| Tyre-Line Limited | Manufacturing | 2018 |
| Tyro Karting Ltd | Arts & recreation | 2012 |
| Tzanda Technology Limited | Professional & scientific | 2012 |
| U.K.Waltz Co., Ltd | Professional & scientific | 2004 |
| Ubul Ltd | Transport & logistics | 2018 |
| Uglykat Ltd | Wholesale & retail | 2020 |
| UK Aimashi Chain Holding Co., Ltd. | Professional & scientific | 2011 |
| UK Befull Trading Ltd | Professional & scientific | 2007 |
| UK Butler Guild Limited | Professional & scientific | 2008 |
| UK Cambridge Biological Science International Group Co., Ltd. | Professional & scientific | 2008 |
| UK Cambridge Instruments Ltd | Manufacturing | 2015 |
| UK Cosend Products Co., Ltd | Extraterritorial | 2017 |
| UK Cotswold Fertile Soil Co., Ltd. | Wholesale & retail | 2025 |
| UK Dentwiton Co., Ltd | Extraterritorial | 2008 |
| UK Enfinidi International Fashion Co., Ltd | Professional & scientific | 2010 |
| UK Eokeke Baby Products Co., Ltd. | Extraterritorial | 2017 |
| UK FSM Petrochemical Technology Limited | Professional & scientific | 2017 |
| UK Helios Crop Science Co., Ltd | Professional & scientific | 2019 |
| UK Inowdon Chemicals Group Co., Limited | Professional & scientific | 2018 |
| UK Kuiko Elevator Group Ltd | Extraterritorial | 2014 |
| UK Measurement Technology Ltd | Professional & scientific | 2020 |
| UK Oriwell Technology Limited | Energy | 2018 |
| UK Rosewell Fluid Control Limited | Professional & scientific | 2016 |
| UK Snmien Petroleum Chemical Ltd | Professional & scientific | 2015 |
| UK Sun Chance Ltd | Professional & scientific | 2016 |
| UK Taxis Daventry Ltd | Transport & logistics | 2022 |
| UK Tuquoque Limited | Professional & scientific | 2022 |
| UK YZY Child Products Co., Limited | Professional & scientific | 2016 |
| Unify Software Solutions Ltd | Information & communication | 2018 |
| Union Canal Carriers Limited | Transport & logistics | 1968 |
| Union Electronic Company Limited | Extraterritorial | 2010 |
| Unisum Technology Co., Limited | Extraterritorial | 2010 |
| United Glory Corporation Limited | Professional & scientific | 2010 |
| Universal Pack (UK) Limited | Professional & scientific | 1994 |
| Upwater Global Limited | Professional & scientific | 2013 |
| Urban Ecosystems Limited | Professional & scientific | 2024 |
| UV Design & Engineering Ltd | Manufacturing | 2011 |
| V&G Brick Work Limited | Construction | 2024 |
| V12 Developments Ltd | Construction | 2022 |
| V12 Hospitality Ltd | Hospitality | 2024 |
| V12 Inns Ltd | Hospitality | 2022 |
| V12 Project & Cost Management Ltd | Administrative & support | 2019 |
| Vacarciuc KOM Ltd | Wholesale & retail | 2025 |
| Val&Nik Ltd | Transport & logistics | 2025 |
| Valamis Learning UK Limited | Professional & scientific | 2002 |
| Valamis Legacy UK Limited | Administrative & support | 2017 |
| Valhalla Armoured Vehicles Ltd | Wholesale & retail | 2025 |
| Vallbona Limited | Professional & scientific | 2017 |
| Valley Engineering Employees Trustee Limited | Financial services | 2023 |
| Valley Engineering Limited | Construction | 2004 |
| Vanmali & Co Limited | Professional & scientific | 2009 |