| Town Superstore Ltd | Wholesale & retail | 2026 |
| Townend Enterprises Limited | Real estate | 2009 |
| Townend Garden Rooms Limited | Hospitality | 2016 |
| Townend Plant & Machinery Limited | Wholesale & retail | 2002 |
| Townfield (High Burton) Management Company Limited | Administrative & support | 2003 |
| Towngate Wealth Limited | Professional & scientific | 2013 |
| Towngate Wealth Management LLP | | 2013 |
| Townham Limited | Professional & scientific | 2015 |
| Towns Consultancy Limited | Professional & scientific | 2025 |
| TPG Media Ltd | Information & communication | 2020 |
| TPM Real Estate Ltd | Real estate | 2023 |
| TPS Bayhorse Ltd | Hospitality | 2018 |
| TPS Bull & Bush Ltd | Hospitality | 2024 |
| TPS Grove Inn Ltd | Hospitality | 2024 |
| TPS Management Limited | Professional & scientific | 2018 |
| TPS Red Lion Ltd | Hospitality | 2023 |
| TPS the Alexandra Ltd | Hospitality | 2022 |
| TPS the Bruce Ltd | Hospitality | 2022 |
| TPS the Station Ltd | Hospitality | 2024 |
| TPS Walkers Arms Ltd | Hospitality | 2024 |
| TQ7 Haircutting Ltd | Other services | 2012 |
| TQT Services Limited | Wholesale & retail | 2013 |
| TR 5 Star Trading Ltd | Transport & logistics | 2004 |
| Traceid Limited | Information & communication | 2025 |
| Track Metrics Ltd | Information & communication | 2015 |
| Track-It Solutions Ltd | Wholesale & retail | 2025 |
| Trackessential Limited | Wholesale & retail | 2023 |
| Traction Entertainments Ltd | Information & communication | 2018 |
| Tractus Architectural Design Limited | Construction | 2008 |
| Trade Tech Services Limited | Wholesale & retail | 2017 |
| Tradecreditnet Limited | Financial services | 2016 |
| Tradevault App Ltd | Information & communication | 2026 |
| Tradeza Ltd | Wholesale & retail | 2023 |
| Traditional Stone & Slate Supplies Limited | Wholesale & retail | 2002 |
| Tradsaq Ltd | Transport & logistics | 2026 |
| Trailblazer Children Services Ltd | Health & social care | 2025 |
| Trailer ADS Ltd | Professional & scientific | 2023 |
| Train Hard Fight Easy Limited | Administrative & support | 2016 |
| Train Number 2 Ltd | Real estate | 2024 |
| Training Network Limited | Education | 2025 |
| Training Places Group T/As Training Places UK Ltd. | Transport & logistics | 2025 |
| Tranquilitas Ltd | Health & social care | 2019 |
| Tranquility at Northgate Limited | Other services | 2025 |
| Transmission RWA Ltd | Wholesale & retail | 2026 |
| Transport Flow Limited | Water & waste | 2019 |
| Transport in Automotive Ltd | Transport & logistics | 2025 |
| Trappex Limited | Manufacturing | 2012 |
| Trappings Limited | Wholesale & retail | 1994 |
| Trattare Ltd | Financial services | 2020 |
| Trattoria (Hudds) Ltd | Hospitality | 2018 |
| Travel Studios Ltd | Construction | 2018 |
| Travele Limited | Administrative & support | 2024 |
| Travellers Squad Consultants Limited | Professional & scientific | 2025 |
| TRAVELS4U Ltd | Transport & logistics | 2023 |
| Traymate Products Limited | Manufacturing | 2010 |
| TRD 119 Ltd | Construction | 2010 |
| Treacle Movement Ltd | Other services | 2024 |
| Treasure Trove Consultancy Ltd | Professional & scientific | 2022 |
| Treasure Trove Holdings Limited | Financial services | 2023 |
| Treasure Trove Ltd | Wholesale & retail | 2020 |
| Tree Survey Solutions Ltd | Professional & scientific | 2024 |
| Treefrog Communications Limited | Information & communication | 2012 |
| Trekin Ltd | Hospitality | 2024 |
| Trend Architecture Ltd | Professional & scientific | 2021 |
| Trendhive Offical Limited | Wholesale & retail | 2025 |
| Trendivo Ltd | Wholesale & retail | 2025 |
| Trendultra Limited | Wholesale & retail | 2020 |
| Trendz & Vanz Ltd | Transport & logistics | 2020 |
| Trenix Limited | Wholesale & retail | 2026 |
| Tresler Electrical Solutions Limited | Construction | 2021 |
| Trevor Dyson Joinery Ltd | Construction | 2006 |
| Trevor Matheson Enterprise Ltd | Wholesale & retail | 2025 |
| Tri-Bek Limited | Construction | 2026 |
| Tri-Heat Energy Ltd | Construction | 2016 |
| Triangle Bodyshop Ltd | Wholesale & retail | 2017 |
| Tribeca Digital Media Limited | Professional & scientific | 1986 |
| Tribusit Limited | Information & communication | 2018 |
| Trichon Media Ltd | Information & communication | 2025 |
| Trichonometry UK Ltd | Other services | 2025 |
| Tricott Limited | Wholesale & retail | 2025 |
| Trident 2010 Limited | Real estate | 2013 |
| Trident 2019 Limited | Wholesale & retail | 2019 |
| Trident 2026 Ltd | Real estate | 2026 |
| Trident Computer Contractors Limited | Information & communication | 1998 |
| Trigpoint Joinery Ltd | Administrative & support | 2017 |
| Triline (2020) Limited | Professional & scientific | 2020 |
| Triline Contracts Limited | Construction | 1988 |
| Trinack Ltd | Wholesale & retail | 2022 |
| Trinitees Fish & Chips Limited | Hospitality | 2016 |
| Trinity Building Services (UK) Ltd | Construction | 2025 |
| Trinity Business Support Limited | Administrative & support | 2018 |
| Trinity Cars and Vans Ltd | Wholesale & retail | 2020 |
| Trinity Law Solicitors Ltd | Professional & scientific | 2013 |
| Trinity Legal Consultancy Ltd | Professional & scientific | 2020 |
| Trinity Pizza Limited | Hospitality | 2016 |
| Trinity Trading and Consulting Limited | Wholesale & retail | 2021 |
| Triple a Housing Limited | Real estate | 2024 |
| Triple Check Consultancy Limited | Administrative & support | 2025 |
| Triple E Properties Ltd | Construction | 2025 |
| Tristan Dance Studios Ltd. | Arts & recreation | 2015 |