| TT Utility Ltd | Construction | 2022 |
| TTA Trading Leicester Ltd | Wholesale & retail | 2025 |
| TTC - the Transport Co Ltd | Transport & logistics | 2021 |
| Ttcg Care Services Ltd | Health & social care | 2024 |
| TTL Transport Ltd | Transport & logistics | 2014 |
| Ttmt Holdings Ltd | Wholesale & retail | 2024 |
| TTP Elements Limited | Professional & scientific | 2019 |
| TTR Local Ltd | Wholesale & retail | 2024 |
| TTS Assist Limited | Wholesale & retail | 2019 |
| TTS Media UK Ltd | Wholesale & retail | 2012 |
| TTT Angels Care Services Limited | Administrative & support | 2022 |
| Tube Products (SW) Ltd | Manufacturing | 2020 |
| Tubes Holdco Limited | Financial services | 2012 |
| Tubes Scaffolding (Leicester) Limited | Construction | 2009 |
| Tubo Restaurants Ltd | Hospitality | 2025 |
| Tucc Ltd | Wholesale & retail | 2016 |
| Tuck Technology Limited | Information & communication | 2020 |
| Tucker Arts Limited | Information & communication | 2025 |
| Tudor OFF Licence Ltd | Wholesale & retail | 2024 |
| Tudor OFF License Ltd | Wholesale & retail | 2026 |
| Tudor Supermarket Ltd | Wholesale & retail | 2025 |
| Tufton Street Property Limited | Real estate | 2023 |
| Tugby Orchards Limited | Real estate | 2014 |
| Tuilagi Rugby Skills Ltd | Arts & recreation | 2011 |
| Tuition Arts UK Ltd | Education | 2025 |
| Tuition Studio Limited | Education | 2013 |
| TUK in Foods Ltd | Manufacturing | 2015 |
| TUK in Foods Manufacturing Ltd | Manufacturing | 2018 |
| TUK TUK Journey Ltd | Hospitality | 2016 |
| TUK TUK Journey Narborough Road Ltd | Hospitality | 2021 |
| TUK TUK Smiles Ltd | Professional & scientific | 2021 |
| Tukur Medical Ltd | Health & social care | 2021 |
| Tukwoyi Limited | Health & social care | 2024 |
| Tula and TYE Ltd | Wholesale & retail | 2020 |
| Tulah Properties Limited | Real estate | 2014 |
| Tuli & Singh Property Developer Limited | Construction | 2024 |
| Tuli Print & Technologies Ltd | Manufacturing | 2023 |
| Tuli Properties Limited | Real estate | 2020 |
| Tulip Construction Ltd | Construction | 2022 |
| Tulip Locums Limited | Health & social care | 2019 |
| Tulipa Hair & Beauty Ltd | Other services | 2018 |
| Tuliptech Ltd | Information & communication | 2011 |
| Tully Maher Ltd | Administrative & support | 2025 |
| Tulsi 369 Limited | Real estate | 2025 |
| Tulsishyam Enterprise Ltd | Wholesale & retail | 2023 |
| Tumac Limited | Manufacturing | 1988 |
| Tumchha Limited | Hospitality | 2024 |
| Tumeke Music Ltd | Information & communication | 2025 |
| Tumeric 26 Productions Ltd | Extraterritorial | 2025 |
| Tumi’S Fashion Limited | Other services | 2023 |
| Tunbiar Ltd | Wholesale & retail | 2025 |
| Tunbridge Developments Limited | Construction | 2023 |
| Tuncher Bookkeeping and Business Consultancy Limited | Professional & scientific | 2021 |
| Tundra Ltd | Health & social care | 2024 |
| Tungsten Asset Management Limited | Construction | 2014 |
| Tungsten Birkenhead Limited | Construction | 2021 |
| Tungsten Brackley Limited | Real estate | 2020 |
| Tungsten Cirencester Limited | Construction | 2020 |
| Tungsten Cladding Limited | Construction | 2023 |
| Tungsten Colchester Limited | Construction | 2022 |
| Tungsten DEV Co 1 Limited | Real estate | 2022 |
| Tungsten DEV Co 10 Limited | Real estate | 2022 |
| Tungsten DEV Co 11 Limited | Construction | 2025 |
| Tungsten DEV Co 12 Limited | Construction | 2024 |
| Tungsten DEV Co 14 Limited | Construction | 2025 |
| Tungsten DEV Co 2 Limited | Construction | 2021 |
| Tungsten DEV Co 3 Limited | Construction | 2024 |
| Tungsten DEV Co 4 Limited | Construction | 2024 |
| Tungsten DEV Co 5 Limited | Construction | 2024 |
| Tungsten DEV Co 6 Limited | Construction | 2022 |
| Tungsten DEV Co 7 Limited | Construction | 2022 |
| Tungsten DEV Co 8 Limited | Construction | 2022 |
| Tungsten DEV Co 9 Limited | Construction | 2025 |
| Tungsten Holdco 1 Limited | Construction | 2023 |
| Tungsten Lutterworth (1) Limited | Real estate | 2019 |
| Tungsten MW Witney Limited | Construction | 2019 |
| Tungsten Nuneaton Limited | Construction | 2022 |
| Tungsten Oakham (1) Limited | Construction | 2020 |
| Tungsten Park (Oakham) Management Company Limited | Households | 2021 |
| Tungsten Park Witney Management Company Limited | Real estate | 2021 |
| Tungsten Properties Limited | Construction | 2005 |
| Tungsten Property Investment Ltd | Real estate | 2022 |
| Tungsten Witham (1) Limited | Real estate | 2019 |
| Tungsten Worksop Limited | Real estate | 2021 |
| Tunnels Global Limited | Information & communication | 2025 |
| Tunner Transport Limited | Transport & logistics | 2009 |
| Tunup Cricket Limited | Wholesale & retail | 2026 |
| Turban King Limited | Wholesale & retail | 2025 |
| Turbine Controls Holdings Limited | Professional & scientific | 2009 |
| Turbine Controls Limited | Manufacturing | 1985 |
| Turbo Hamster Garage Ltd | Wholesale & retail | 2020 |
| Turfgrass Agronomy & Services Ltd | Arts & recreation | 2019 |
| Turkish Ceramic Centre Ltd | Construction | 2023 |
| Turkney Investments Ltd | Real estate | 2000 |
| Turkor Limited | Information & communication | 2025 |
| Turlingstone Engineering Limited | Professional & scientific | 2017 |
| Turn Key Care Limited | Construction | 2021 |
| Turna Holdings Ltd | Real estate | 2026 |
| Turnbulls Health Care Limited | Health & social care | 2023 |
| Turner & Bell Ltd | Wholesale & retail | 2017 |