| Trans-Global Engineering Services Limited | Professional & scientific | 1972 |
| Transform Aesthetics by Helen Tran Ltd | Other services | 2025 |
| Transformation Team Training Limited | Arts & recreation | 2016 |
| Transformers School of Motoring Limited | Education | 2015 |
| Transocean Offshore (North Sea) Ltd. | | 1996 |
| Transport Services Scotland Ltd | Professional & scientific | 2024 |
| Travel D.S. Ltd | Administrative & support | 2006 |
| Travel JET Cargo Ltd | Transport & logistics | 2019 |
| Travel JET Corporate Ltd | Administrative & support | 2019 |
| Travers Distribution Services Ltd | Transport & logistics | 2025 |
| TRE Investments Limited | | 2023 |
| Tree:Tment Tree and Land Services Ltd | Administrative & support | 2012 |
| Treleven and Co Limited | Wholesale & retail | 2025 |
| Tremble Logistics Ltd | Transport & logistics | 2016 |
| Trende Essentials Ltd | Wholesale & retail | 2022 |
| Tres+ Limited | Construction | 2026 |
| Triffic Consulting Ltd | Information & communication | 2023 |
| Trigenica Limited | Information & communication | 2017 |
| Trimingham Properties Limited | | 2023 |
| Trinity Kidz Club Limited | Health & social care | 2025 |
| Triple V Properties Ltd | Real estate | 2023 |
| Triskelion Property Limited | Real estate | 2025 |
| Trivium Group Limited | Information & communication | 2021 |
| True Finance Figure Ltd | Professional & scientific | 2025 |
| TSR Design Engineering Services Ltd | Professional & scientific | 2018 |
| TTA OUT of School Care Ltd | Professional & scientific | 2021 |
| TTT Deka Ltd | Arts & recreation | 2025 |
| Tuite Ltd | Wholesale & retail | 2010 |
| Tullis Plastics Limited | Extraterritorial | 2013 |
| Tumeke Enterprises Limited | Real estate | 2019 |
| Tummelbridge Construction Limited | Construction | 2015 |
| Turbine Engineering Limited | Professional & scientific | 2025 |
| Turner Capital Invest Ltd | Real estate | 2023 |
| Turner Property Solutions Ltd | Real estate | 2023 |
| Tvhl Limited | Wholesale & retail | 2021 |
| Twin Holdings (Scotland) Limited | Real estate | 2011 |
| Twinkle Town Wolverhampton Ltd | Arts & recreation | 2024 |
| Twisted Willow Properties Limited | Real estate | 2019 |
| Two Checkers Ltd | Real estate | 2021 |
| Two Property Renovations Ltd | Real estate | 2024 |
| TYC Events Limited | Hospitality | 2020 |
| UC Advice & Advocacy Limited | Information & communication | 2015 |
| Uddingston Rehabilitation Gym Ltd | Arts & recreation | 2023 |
| Udston Consultancy Limited | Professional & scientific | 2023 |
| Udston Fire Consultancy Limited | Professional & scientific | 2013 |
| UK GAS Safety and Competence Ltd. | Manufacturing | 2012 |
| UK MSE Electrical Limited | Construction | 2021 |
| UK MSE Group Limited | Professional & scientific | 2024 |
| Uk-Eu-Van Ltd | Transport & logistics | 2025 |
| Uksoccershop Limited | Wholesale & retail | 2011 |
| Ultra Clear Cleaning Limited | Administrative & support | 2018 |
| Ultra Clear Commercial Limited | Administrative & support | 2018 |
| Ultra Clear Domestic Limited | Administrative & support | 2023 |
| Ultra Trade Hub Ltd | Wholesale & retail | 2025 |
| Umairashraf Ltd | Wholesale & retail | 2025 |
| Umbra Health Ltd | Information & communication | 2026 |
| UMS Flowell Assets Limited | Manufacturing | 2012 |
| UMS Flowell Holdings Limited | Manufacturing | 2015 |
| UMS Flowell UK Limited | Administrative & support | 2010 |
| UMZ Investments Ltd | Real estate | 2025 |
| UN Cafe Limited | Hospitality | 2025 |
| Under PAR Ltd | Wholesale & retail | 2016 |
| Uniforms Group Services Ltd | Administrative & support | 2025 |
| Unique Fashion (Midlands) Ltd | Manufacturing | 2019 |
| Unity 9 Ltd | Real estate | 2024 |
| UNITY1 Electrical Contractors Ltd | Construction | 2017 |
| Unwind Property Ltd | Administrative & support | 2023 |
| Upchart Ltd | Information & communication | 2026 |
| Upeel Ltd | Administrative & support | 2016 |
| UPS and Downs Theatre Group | Arts & recreation | 2011 |
| Urban Base Living Ltd | Other services | 2021 |
| Urban Credz Limited | Wholesale & retail | 2025 |
| Urban Decor Limited | Construction | 2015 |
| Urban IVY Ltd | Wholesale & retail | 2018 |
| Urban Street Scene Ltd | Hospitality | 2023 |
| Urbanistaplanning Ltd | Professional & scientific | 2024 |
| Ushco Events Ltd | Hospitality | 2024 |
| Usmancleaners Ltd | Manufacturing | 2024 |
| Utility Design Services Ltd | Professional & scientific | 2020 |
| UZ Healthcare Services Limited | Health & social care | 2024 |
| V & M Properties Leicester Limited | Real estate | 2017 |
| V&A Initiatives Limited | Real estate | 2022 |
| V3 Designs Ltd | Manufacturing | 2018 |
| Vaagai Health Limited | Health & social care | 2024 |
| Vacua-Therm Design Limited | Other services | 1985 |
| Valhalla Apparel Ltd | Wholesale & retail | 2023 |
| Vallerian Limited | Real estate | 2016 |
| Valletti Limited | Wholesale & retail | 2021 |
| Valton Limited | | 2023 |
| Vamos Padel Glasgow Ltd | Arts & recreation | 2023 |
| Vanessa Murphy Makeup Ltd | Other services | 2024 |
| Vanilla 4 Limited | Real estate | 2021 |
| Vanilla Future LLP | | 2019 |
| Vantage Recruitment Ltd | Administrative & support | 2019 |
| Vastclicks Ltd | Professional & scientific | 2017 |
| Vatavisionfootballmanagement Limited | Arts & recreation | 2023 |
| Vehicle & Plant Repair Services Limited | Wholesale & retail | 2010 |
| Veldonflow Ltd | Transport & logistics | 2025 |
| Velocity Lines Limited | Wholesale & retail | 2016 |
| Vengo Ltd | Health & social care | 2023 |