| Trendz Ltd | Wholesale & retail | 2025 |
| Trenton’S Pizza Ltd | Hospitality | 2024 |
| Trevor Potts Plant Hire Ltd | Water & waste | 2012 |
| Trevor Potts Waste Disposal Limited | Transport & logistics | 1983 |
| Treyvo Limited | Information & communication | 2024 |
| Trident Bathrooms Limited | | 1987 |
| Trigh Properties Ltd | Real estate | 2021 |
| Trilumina Education Limited | Education | 2025 |
| Trinidel Health Care Ltd | Public administration | 2023 |
| Trinity Carers Limited | Households | 2022 |
| Trinity Construction Management Ltd | Construction | 2019 |
| Trinity Hearing Clinic Ltd | Wholesale & retail | 2019 |
| Trinity Mechanical Ltd | Construction | 2014 |
| Trinity Media Ltd | Other services | 2018 |
| Trinity Motorz Ltd | Wholesale & retail | 2021 |
| Trinity Park Estates Ltd | Real estate | 2019 |
| Triple N Health Care Ltd | Health & social care | 2025 |
| Triple S Collection Ltd | Administrative & support | 2024 |
| Tripple a Global Limited | Wholesale & retail | 2025 |
| Tritan Limited | Wholesale & retail | 2011 |
| TRL Medical and Consulting Associates Limited | Information & communication | 2012 |
| TRO Trading Ltd | Extraterritorial | 2021 |
| TRS Management Limited | Professional & scientific | 2003 |
| TRS Renewables Ltd | Professional & scientific | 2023 |
| TRT Promotions Limited | Professional & scientific | 1992 |
| TRU Boutique Limited | Wholesale & retail | 2024 |
| Truckers 4 U Limited | Transport & logistics | 2019 |
| Trudiel Entertainment Ltd | Arts & recreation | 2024 |
| True Automation Ltd | Construction | 2023 |
| True Crane Care Limited | Manufacturing | 2018 |
| True Refrigeration UK Limited | Wholesale & retail | 1999 |
| True Tile Limited | Construction | 2021 |
| Truecare Energy Solutions Ltd | Construction | 2026 |
| Truell Properties Ltd | Real estate | 2025 |
| Trueman & Keilty Limited | Administrative & support | 2026 |
| Truespec Golf Ltd | Wholesale & retail | 2025 |
| Truferlewellie Group Ltd | Transport & logistics | 2024 |
| Trusound Installation Limited | Extraterritorial | 1975 |
| Trusound Limited | Extraterritorial | 1984 |
| Trusound Manufacturing Limited | Extraterritorial | 1955 |
| Trusound Rentals Limited | Extraterritorial | 1959 |
| Trust Education Limited | Administrative & support | 2022 |
| Trust Trailers Ltd | Construction | 2004 |
| Trustlock Homes Ltd | Construction | 2024 |
| Trutec NDT Limited | Professional & scientific | 2017 |
| Truth Engagement Ltd | Information & communication | 2024 |
| Truthstudio Ltd | Information & communication | 2004 |
| TS Asset Holdings Limited | Administrative & support | 2025 |
| TS GP Medicare Services Limited | Health & social care | 2020 |
| TS Management Solutions Ltd | Construction | 2026 |
| TS UK Holdings Limited | Financial services | 2026 |
| TS UK Property Limited | Real estate | 2026 |
| TSA UK - Scaffold & Access Limited | Administrative & support | 2025 |
| Tschealthcare Ltd | Health & social care | 2020 |
| TSD Motor Sales Ltd | Wholesale & retail | 2021 |
| Tsgt Properties Limited | Real estate | 2024 |
| Tsimbi Ltd | Real estate | 2019 |
| TSM Associates Ltd | Other services | 2020 |
| TSM Property Services Ltd | Real estate | 2025 |
| Tsnt Health Care Ltd | Other services | 2017 |
| TST Development Company Limited | Construction | 2025 |
| TT Motor Link Ltd | Wholesale & retail | 2024 |
| TTP Invest Ltd | Financial services | 2022 |
| TTS Travel Ltd | Transport & logistics | 2025 |
| TTW (Partners) Ltd | Wholesale & retail | 2004 |
| TTW Autotrim Ltd | Wholesale & retail | 2016 |
| TTW Distribution Ltd | Wholesale & retail | 2014 |
| Tuath Anam Ltd | Real estate | 2016 |
| Tubal Trading Ltd | Administrative & support | 2018 |
| Tubby GUY Hockey Ltd. | Manufacturing | 2024 |
| Tubular Scaffolding Services Limited | Extraterritorial | 2002 |
| Tucker Fasteners Limited | Professional & scientific | 1903 |
| Tucker Products Limited | Extraterritorial | 1950 |
| Tudor House Hostel Ltd | Real estate | 2026 |
| Tunstall Accounting Limited | Professional & scientific | 2018 |
| Turbine Power Solutions Limited | Professional & scientific | 2019 |
| Turbo Taxis Ltd | Transport & logistics | 2025 |
| Turners (Trnk) Ltd | Construction | 2016 |
| Turret Rotherham Limited | Manufacturing | 2022 |
| TUS Plant Ltd | Administrative & support | 2023 |
| Tuscan Estates UK Limited | Manufacturing | 2026 |
| Tusk Holdco 2 Limited | Financial services | 2023 |
| Tusk Holdco 3 Limited | Financial services | 2023 |
| Tutelage Training Services Ltd | Professional & scientific | 2019 |
| TW Global Consultancies Ltd | Professional & scientific | 2025 |
| TW Holding 25 Ltd | Hospitality | 2025 |
| Twch Trading Limited | Wholesale & retail | 2007 |
| TWENTY7 Media and PR Ltd | Professional & scientific | 2024 |
| Twigg Lets Limited | Real estate | 2021 |
| Twin Pebble Ventures Ltd | Real estate | 2026 |
| Twisted Genius Productions Ltd | Information & communication | 2026 |
| Twisted Tanning Limited | Other services | 2016 |
| Ty&Soph Properties Limited | Real estate | 2025 |
| Tyche International Group Ltd | Wholesale & retail | 2026 |
| Tyco Mechanical Ltd | Energy | 2014 |
| Tyers Groundworks & Paving Ltd | Construction | 2022 |
| Tyler & Co Properties Limited | Real estate | 2022 |
| Tyler Property Developments Limited | Real estate | 2024 |
| Typeset CIC | Arts & recreation | 2021 |
| T’Old Bird & Co Ltd | Real estate | 2026 |