| Trademcraft Ltd | Wholesale & retail | 2024 |
| Tradenotes App Ltd | Information & communication | 2026 |
| Trading Services London Limited | Administrative & support | 2025 |
| Trading Source Limited | Hospitality | 2025 |
| Tradis Ltd | Wholesale & retail | 2019 |
| Tradis Wholesale Ltd | Wholesale & retail | 2019 |
| Traffield Limited | Construction | 2009 |
| Trailing Bean Ltd | Hospitality | 2020 |
| Train Yard Fitness Limited | Arts & recreation | 2021 |
| Trakk Homes Ltd | Real estate | 2019 |
| Trakk Ltd | Construction | 2014 |
| Trans Radu Limited | Transport & logistics | 2018 |
| Transaction Exchange Limited | Extraterritorial | 2010 |
| Transeurope Ltd | Transport & logistics | 2024 |
| TRANSFOR19 Ltd | Wholesale & retail | 2024 |
| Transform PR & Communications Limited | Information & communication | 2019 |
| Transitlink Ltd | Transport & logistics | 2021 |
| Translatious Ltd | Professional & scientific | 2015 |
| Transmd Ltd | Transport & logistics | 2025 |
| Transpace Interiors and Building Solutions Ltd | Construction | 2008 |
| Transpelsik Ltd | Transport & logistics | 2018 |
| Transvic Limited | Transport & logistics | 2017 |
| Trauma Medical Reporting Services Limited | Health & social care | 2005 |
| Travel 3 UK Ltd | Wholesale & retail | 2025 |
| Travel With Claire Limited | Administrative & support | 2019 |
| Travelhome@Uk Limited | Administrative & support | 2020 |
| Traxler's Auto Ltd | Wholesale & retail | 2018 |
| Treasure Marketplace Ltd | Wholesale & retail | 2024 |
| Treble M Ltd | Health & social care | 2016 |
| Tree Pro Ltd | Agriculture & fishing | 2013 |
| Treecycle Limited | Administrative & support | 2018 |
| Treehouse Childrens Club Limited | Health & social care | 2015 |
| Treeradar UK Limited | Professional & scientific | 2016 |
| Treetop Associates Limited | Real estate | 2002 |
| Treetops Penshurst Limited | Arts & recreation | 2014 |
| Treetops Tree Surgery Ltd | Administrative & support | 2024 |
| Treize Consulting Limited | Professional & scientific | 2024 |
| Treizetwo Limited | Extraterritorial | 2025 |
| Trek Electrical Limited | Construction | 2026 |
| Trek Plumbing and Heating Ltd | Construction | 2014 |
| Treliving and Birch Ltd | Professional & scientific | 2021 |
| Trend Tonic Ltd | Manufacturing | 2018 |
| Trest.Lv Limited | Other services | 2019 |
| Trevlyn Properties Ltd | Administrative & support | 2016 |
| Trevor Collins Healthcare Ltd | Health & social care | 2023 |
| Trevor Pearce Associates Limited | Administrative & support | 2016 |
| Trevor Scott Consulting Ltd. | Professional & scientific | 2013 |
| Triangle News Group Limited | Information & communication | 2015 |
| Tric EV Ltd | Information & communication | 2025 |
| Trident Fire & Security Limited | Construction | 2024 |
| Trident Maintain Limited | Construction | 2010 |
| Trident Projects Limited | Construction | 2014 |
| Trifonov Ltd | Transport & logistics | 2024 |
| Triline Trading Limited | Wholesale & retail | 2021 |
| Trilogy Print Solutions Ltd | Manufacturing | 2007 |
| Trimfore Limited | Hospitality | 2022 |
| Trinco News Ltd | Wholesale & retail | 2026 |
| Trindade and Bird Limited | Construction | 2011 |
| Trinidad and Tobago Fine Cocoa Company Limited | Extraterritorial | 2015 |
| Trinity Engineering Consultant Ltd | Professional & scientific | 2024 |
| Trinity Global Enterprises Limited | Professional & scientific | 2026 |
| Trinity Independent Ltd | Administrative & support | 2024 |
| Trinity Mews Limited | Health & social care | 2016 |
| Trinity Osteopathy Ltd | Health & social care | 2010 |
| Trinity Property Services and Maintenance Ltd | Real estate | 2023 |
| Trinity-Ca Ltd | Professional & scientific | 2018 |
| Tripco Travels Ltd | Administrative & support | 2025 |
| Tripingale Ltd | Wholesale & retail | 2026 |
| Triple a Artist Agency Ltd | Administrative & support | 2000 |
| Triple a Artist Management Ltd | Education | 1999 |
| Triple a Crimeshare TV Ltd | Administrative & support | 1989 |
| Triple a Multimedia Academy Ltd | Arts & recreation | 1994 |
| Triple a Productions Ltd. | Information & communication | 2012 |
| Triple a Publishing Limited | Information & communication | 1999 |
| Triple a Records Limited | Information & communication | 1999 |
| Triple a. Multimedia Group Limited | Information & communication | 2000 |
| Triple D Ventures Limited | Other services | 2015 |
| Triple H Engineering Limited | Professional & scientific | 2016 |
| Triple H Fabrication Ltd | Manufacturing | 2018 |
| Triple H Finance Limited | Administrative & support | 2018 |
| Triplo Enterprises Limited | Wholesale & retail | 2022 |
| Triton Properties Limited | Real estate | 2001 |
| Triumph Care Support Ltd | Health & social care | 2026 |
| Triumph of Grace Ministries | Other services | 2020 |
| Trojan Stripout Limited | Construction | 2012 |
| Troka Tyres & Car Servicing Ltd | Wholesale & retail | 2022 |
| Trophy Home Improvements Ltd | Construction | 2022 |
| Tropical Exotical Pets Limited | Wholesale & retail | 2022 |
| Tropical Luxe Ltd | Wholesale & retail | 2025 |
| Trove Art Ltd | Information & communication | 2024 |
| Troy Construction Ltd | Construction | 2014 |
| Trsteno Rentals Ltd | Hospitality | 2022 |
| Truant Films Ltd | Arts & recreation | 2020 |
| True Chapter Tattoo Co Ltd | Other services | 2026 |
| True Lifestyles Limited | Financial services | 2014 |
| True Shield Home Improvements Ltd | Construction | 2025 |
| Truly Scrumptious Hythe Limited | Hospitality | 2024 |
| Trunk Animation UK Limited | Information & communication | 2010 |
| Trutech Group Ltd | Administrative & support | 2024 |
| TS & B Contractors Limited | Construction | 2011 |