| TPN Windows Ltd | Administrative & support | 2017 |
| Tpowerservices Limited | Manufacturing | 2021 |
| TR Cleanora Services Ltd | Administrative & support | 2026 |
| TR Delivered Ltd | Transport & logistics | 2020 |
| TR Group Holdings Limited | Financial services | 2021 |
| TR Racing Events Ltd | Arts & recreation | 2026 |
| Trace Build Ltd | Construction | 2021 |
| Tracesheet Ltd | Information & communication | 2026 |
| Trackoria Material Systems Limited | Information & communication | 2026 |
| Trackpulse Ltd | Professional & scientific | 2026 |
| Tracksideracing Ltd | Information & communication | 2026 |
| Trade & Triumph Ltd | Wholesale & retail | 2025 |
| Trade Axis Ltd | Wholesale & retail | 2025 |
| Trade Car Network Ltd | Information & communication | 2020 |
| Trade Connections Limited | Wholesale & retail | 2022 |
| Trade Flow Limited | Information & communication | 2010 |
| Trade Forge Network Ltd | Administrative & support | 2025 |
| Trade Like a Machine Ltd | Information & communication | 2017 |
| Trade Pro 360 Ltd | Information & communication | 2025 |
| Trade X Auto Ltd | Wholesale & retail | 2025 |
| TRADE-2GETHER Limited | Wholesale & retail | 2022 |
| Tradecard Ltd | Construction | 2024 |
| Tradecascade Limited | Wholesale & retail | 2023 |
| Tradeinvoicer Ltd | Information & communication | 2026 |
| Tradeosaurus Ltd | Wholesale & retail | 2022 |
| Tradesnextdoor Ltd. | Construction | 2025 |
| Tradestone Group Ltd | Information & communication | 2026 |
| Tradevibe Ltd | Wholesale & retail | 2025 |
| Traditional Roofing Products Limited | Wholesale & retail | 2000 |
| Trago Tech Ltd | Wholesale & retail | 2025 |
| Traminco Limited | Professional & scientific | 1991 |
| Tranilamp Limited | Manufacturing | 1963 |
| Tranquil Minds Ltd | Health & social care | 2023 |
| Trans Horn Car Central Ltd | Wholesale & retail | 2012 |
| Transferiti Ltd | Transport & logistics | 2022 |
| Transform (International) Limited | Information & communication | 2021 |
| Transformative City Spaces Ltd | Real estate | 2020 |
| Transformgen CIC | Professional & scientific | 2026 |
| Transilvanian Bites Ltd | Hospitality | 2025 |
| Translingua Ltd | Information & communication | 2012 |
| Transnational Archival Network CIC | Professional & scientific | 2026 |
| Transparency Construction Ltd | Construction | 2025 |
| Trastero Agsolutions Ltd | Manufacturing | 2020 |
| Trastero Limited | Real estate | 2003 |
| Travel Cars Bury Ltd | Transport & logistics | 2025 |
| Travel Hospitality Entertainment Consultancy Limited | Professional & scientific | 2019 |
| Travel Hunt Ltd | Administrative & support | 2018 |
| Travelol Limited | Information & communication | 2025 |
| Travlux Ltd | Administrative & support | 2020 |
| Traxploitation Ltd | Information & communication | 2016 |
| Trds Properties Limited | Real estate | 2021 |
| Treasured Words Limited | Manufacturing | 2025 |
| Treat Haven Ltd | Wholesale & retail | 2020 |
| Trebor GRP Limited | Construction | 2026 |
| Treetops Capital Ltd | Real estate | 2024 |
| Treewaters Control Systems Ltd. | Construction | 2008 |
| Treka Capital Ltd | Financial services | 2025 |
| Trelo Property Ltd | Real estate | 2025 |
| Tremak IT Consultancy Ltd | Information & communication | 2020 |
| Trench Tiers Limited | Wholesale & retail | 2024 |
| Trendmeup Ltd | Administrative & support | 2022 |
| Trent View Consulting Limited | Education | 2024 |
| Treowsmith Ltd | Extraterritorial | 2024 |
| Tresham Fishing Ltd | Wholesale & retail | 2022 |
| Treyarnon Ltd | Hospitality | 2017 |
| TRI Mochyn Bach Limited | Construction | 2020 |
| Tri-Island Change Initiative CIC | Administrative & support | 2024 |
| Triage Global Ltd | Information & communication | 2025 |
| Tribe Associates Limited | Administrative & support | 2024 |
| Tricare Holdings Limited | Financial services | 2024 |
| Tricare Homes Limited | Health & social care | 2024 |
| Tricare Properties Limited | Real estate | 2024 |
| Tricare Schools Limited | Education | 2024 |
| Trickbitz Limited | Wholesale & retail | 2024 |
| Trickerbay Limited | Wholesale & retail | 2024 |
| Tricore Ventures Limited | Wholesale & retail | 2026 |
| Trident Estate Agents Ltd | Real estate | 2025 |
| Trident Lettings Ltd | Real estate | 2026 |
| Trident Marketing Digital Ltd | Professional & scientific | 2025 |
| Trident SEC Ltd | Administrative & support | 2023 |
| Trifega Ltd | Information & communication | 2022 |
| Trifield Audio Limited | Administrative & support | 2013 |
| Trillium Services Limited | Health & social care | 2026 |
| Trilogy Europe Limited | Administrative & support | 1998 |
| Trimly Books Limited | Wholesale & retail | 2024 |
| Trimworks Limited | Wholesale & retail | 2022 |
| Trinities Ltd | Wholesale & retail | 2025 |
| Trinity Lettings Ltd | Real estate | 2025 |
| Trinity Mobility Limited | Information & communication | 2024 |
| Trinity Welfare Ltd | Health & social care | 2024 |
| Trinitygx Ltd | Real estate | 2024 |
| Trinitygxld Ltd | Health & social care | 2024 |
| Trinitypubs Ltd | Hospitality | 2025 |
| Trini’S Finest Limited | Hospitality | 2019 |
| Triple C Accident Repair Limited | Wholesale & retail | 2023 |
| Triple H Equipment & Logistics UK Ltd | Wholesale & retail | 2025 |
| Triple S Care Solution Ltd | Administrative & support | 2020 |
| Troika Vehicle Leasing Limited | Administrative & support | 2019 |
| Troj Limited | Real estate | 2024 |
| Tropez Villas Limited | Administrative & support | 2017 |