| Transcend Plus Care Ltd | Administrative & support | 2026 |
| Transform Truly Ltd | Other services | 2025 |
| Transit Groups Ltd | Transport & logistics | 2017 |
| Transpire Group Ltd | Professional & scientific | 2023 |
| Transport FIC Ltd. | Transport & logistics | 2016 |
| Transrig Limited | Transport & logistics | 2006 |
| Transversus Limited | Health & social care | 2001 |
| Transworld 2000 Limited | Professional & scientific | 1996 |
| Trapseven Ltd | Construction | 2024 |
| Trattoria Italy Limited | Hospitality | 2012 |
| Travel Expert Manager Limited | Administrative & support | 2023 |
| Traveltastic Holidays Ltd | Administrative & support | 2024 |
| TRC Inspire Potential Ltd | Professional & scientific | 2025 |
| TRE Fitness Ltd | Arts & recreation | 2021 |
| Treasured Threads Ltd | Wholesale & retail | 2023 |
| Treatshack Ltd | Wholesale & retail | 2023 |
| Trebla Consulting Limited | Professional & scientific | 2021 |
| Treddek Ltd | Construction | 2020 |
| Tree and Grounds Maintenance Ltd | Administrative & support | 2017 |
| Tree KIT Limited | Wholesale & retail | 2013 |
| Tregony Stores Ltd | Wholesale & retail | 2023 |
| Trend Investments and Management Limited | Wholesale & retail | 2020 |
| Trendz Events & Photography Ltd | Professional & scientific | 2025 |
| Treveno Ltd | Wholesale & retail | 2025 |
| Trevor Heathcote LLP | | 2010 |
| Trevor Muller Playground Inspections Limited | Professional & scientific | 2018 |
| Trevvett Enterprises Limited | Construction | 2018 |
| Tri-Tech Solutions Limited | Manufacturing | 2021 |
| Trian Building Contractors Ltd | Construction | 2025 |
| Triangle Concepts Ltd | Professional & scientific | 2025 |
| Triangle Engineering Services Limited | Construction | 2005 |
| Triangleuk Limited | Extraterritorial | 2026 |
| Triaxis Solutions Limited | Wholesale & retail | 2025 |
| Trident House Medical Services Limited | Health & social care | 2010 |
| Trident Waste Management Ltd | Water & waste | 2012 |
| Triniti Marketing Limited | Administrative & support | 2010 |
| Trinity Analytical Limited | Professional & scientific | 2026 |
| Trinity Cloud Solutions Limited | Information & communication | 2023 |
| Trinity International Holdings Limited | Professional & scientific | 2019 |
| Trinity Mews Management Company (Headcorn) Ltd | Real estate | 2019 |
| Trinity Research (Associates) Ltd | Professional & scientific | 2010 |
| Tripartner Services Limited | Hospitality | 2025 |
| Tripathi Consulting Limited | Information & communication | 2013 |
| Triple S Lift Services Limited | Manufacturing | 2008 |
| Triple T Training Ltd | Education | 2026 |
| Tripple a Logistics Ltd | Other services | 2017 |
| Trips-Out Limited | Transport & logistics | 2004 |
| Trispec Ltd | Construction | 2025 |
| Tritechdigital Ltd | Wholesale & retail | 2025 |
| Triumph Park Development Limited | Households | 2020 |
| Trizone Electrical Limited | Construction | 2022 |
| TRN Properties Ltd | Real estate | 2017 |
| Trojan Telecom Company Limited | Manufacturing | 1998 |
| Trommel Music Ltd | Information & communication | 2018 |
| Trrya Ltd | Wholesale & retail | 2024 |
| TRU Source Consultants Limited | Information & communication | 2017 |
| Trudie Thomas Accountancy Services Limited | Professional & scientific | 2012 |
| True Holdings (Kent) Limited | Financial services | 2024 |
| True Infinity Limited | Financial services | 2024 |
| True North Canine Ltd | Education | 2019 |
| True North Logistics Ltd | Transport & logistics | 2025 |
| True North Operations Group Ltd | Professional & scientific | 2025 |
| Truepath Financial Ltd | Financial services | 2026 |
| Truline Sealants Ltd | Manufacturing | 2024 |
| Trust Rental Ltd | Administrative & support | 2026 |
| Trusted Facilities Solutions Limited | Administrative & support | 2026 |
| Trusted Home Developments Limited | Construction | 2019 |
| TRW Capital Limited | Construction | 2019 |
| TRW Capital Projects Limited | Construction | 2023 |
| TRW Developments Limited | Construction | 2019 |
| Tryack Ltd | Information & communication | 2019 |
| TS Bath Sushi Ltd | Wholesale & retail | 2022 |
| TSA Consultancy Limited | Administrative & support | 2011 |
| Tsang Limited | Professional & scientific | 2006 |
| TSB Build Projects Ltd | Construction | 2021 |
| TSL Inspections Ltd | Construction | 2015 |
| TSL Kent Properties Limited | Real estate | 2022 |
| TSL Utilities Ltd | Construction | 2021 |
| TSS Refrigeration Limited | Manufacturing | 2015 |
| TST Grid Ltd | Information & communication | 2025 |
| TT Prop Trading UK Ltd | Professional & scientific | 2023 |
| TT Squared EDU Ltd | Public administration | 2024 |
| Tubie Plus Ltd | Wholesale & retail | 2024 |
| Tudor DRY Cleaning Limited | Other services | 2015 |
| Tudor Financial Options Limited | Financial services | 1998 |
| Tuffit South East Limited | Manufacturing | 2000 |
| Tulek Tutoring Ltd | Professional & scientific | 2020 |
| Tull Sports and Clothing Limited | Wholesale & retail | 2000 |
| Tunely Limited | Information & communication | 2026 |
| Tunstall Commercial Ltd | Real estate | 2023 |
| Turcan Services Ltd | Construction | 2022 |
| Turks Flooring Ltd | Wholesale & retail | 2016 |
| Turmeric Twist Ltd | Hospitality | 2024 |
| Turning Point Ventures Ltd | Information & communication | 2025 |
| Turtle Bay SUP and Surf Ltd | Arts & recreation | 2026 |
| Tutorworld Education Ltd | Education | 2019 |
| Tutt Hill Property Limited | Professional & scientific | 2009 |
| TV & Film Transport Hire Ltd | Transport & logistics | 2023 |
| TV Experts Limited | Extraterritorial | 2009 |
| Tvcn Commodities Ltd | Wholesale & retail | 2024 |