| Trinity Assets Consultancy Ltd | Information & communication | 2025 |
| Trinity Change Consultancy Ltd | Professional & scientific | 2024 |
| Trinity Engineering Consulting Ltd | Professional & scientific | 2024 |
| Trinity Hair (Birmingham) Ltd | Other services | 2020 |
| Trio Leisure and Entertainment Ltd | Arts & recreation | 2022 |
| Trip Tees Ltd | Wholesale & retail | 2020 |
| Triple a Motor Group Limited | Wholesale & retail | 2024 |
| Triple AAA Trades Ltd | Wholesale & retail | 2020 |
| Triple Crown Associates Limited | Real estate | 2011 |
| Triple F Metaverse Ventures Ltd | Information & communication | 2025 |
| Triple P Chicken Ltd | Hospitality | 2025 |
| Triple R Developments Limited | Manufacturing | 2007 |
| Triple SO Contractors Limited | Other services | 2023 |
| Tripple a Private Limited | Health & social care | 2011 |
| Triqs (Central) Limited | Professional & scientific | 1999 |
| Trok Consultants Ltd | Professional & scientific | 2025 |
| Troop AID | Health & social care | 2015 |
| Trotwood Holdings Limited | Professional & scientific | 1998 |
| Truck & Track Multi Media Limited | Information & communication | 2020 |
| Truck and Track Limited | Professional & scientific | 2009 |
| Truck Star (Midlands) Ltd | Administrative & support | 2025 |
| True Buildz Limited | Construction | 2025 |
| True Fitness CIC | Arts & recreation | 2015 |
| True Focal Media Ltd | Manufacturing | 2025 |
| True Housing CIC | Education | 2024 |
| True Lane Transport Limited | Transport & logistics | 2021 |
| True North Dynamics Group Limited | Professional & scientific | 2026 |
| True North Investing Limited | Real estate | 2025 |
| True North Service Management Solutions Ltd | Information & communication | 2018 |
| True to Sole UK Limited | Wholesale & retail | 2025 |
| Truecraft Carpentry & Renovations Ltd | Construction | 2026 |
| Truelocus Consulting Limited | Real estate | 2016 |
| Trueman Consultants LLP | | 2026 |
| Truffles Group Ltd | Real estate | 2024 |
| Truly Jewellery Limited | Wholesale & retail | 2013 |
| Truly Successive Ltd | Information & communication | 2019 |
| Trumake Ltd | Construction | 2020 |
| Truss Solutions Ltd | Manufacturing | 2018 |
| Truss-Tech Limited | Manufacturing | 1991 |
| Trusters Realty Ltd | Real estate | 2025 |
| Trustpoint Governance Limited | Professional & scientific | 2024 |
| Trusty TRADE1 Ltd | Wholesale & retail | 2026 |
| TRW Employees Benefit Trust Limited | Extraterritorial | 1940 |
| TRW Steering Systems Limited | Extraterritorial | 1928 |
| TRW U.K. Limited | Professional & scientific | 1929 |
| TRY Tuition Birmingham Ltd | Education | 2025 |
| TRY Tuition UK Ltd | Education | 2021 |
| TS Entertainment Ltd | Professional & scientific | 2022 |
| TS Solutions Midlands Limited | Other services | 2022 |
| Ts&S Property Ltd | Real estate | 2023 |
| TS2 (Freehold) Limited | Other services | 2023 |
| Tsam UK Limited | Real estate | 2020 |
| Tschik Limited | Other services | 2017 |
| Tsepang Caring Limited | Health & social care | 2014 |
| Tsii Limited | Real estate | 2005 |
| TSJ Consulting Limited | Professional & scientific | 2023 |
| TSJ Partnership Ltd | Real estate | 2026 |
| Tsrmerchandise Ltd | Wholesale & retail | 2023 |
| TT 2023 Investments Limited | Professional & scientific | 2021 |
| TTG Audiology Group Ltd | Professional & scientific | 2026 |
| TTN7 Limited | Information & communication | 2020 |
| TTS Transport Ltd | Transport & logistics | 2023 |
| TU Consultancy Limited | Real estate | 2018 |
| Tudor Grange Academies Trust | Education | 2010 |
| Tudor House (Walsall) Limited | Households | 2000 |
| Tudor House Tuition WM Ltd | Education | 2019 |
| Tudor Locum Limited | Health & social care | 2009 |
| Tudor Maintenance Limited | Construction | 2013 |
| Tuhub Ltd | Real estate | 2019 |
| TUK Global Ltd | Information & communication | 2023 |
| Tuko Ltd | Wholesale & retail | 2023 |
| Tulinky Ltd | Wholesale & retail | 2025 |
| Tullagh Contractors Limited | Construction | 2013 |
| Tullyard Ltd | Professional & scientific | 2017 |
| Tullybrone Ltd | Real estate | 2022 |
| Tullyglush Ltd | Construction | 2022 |
| Tumber Tennis Ltd | Education | 2024 |
| Tundra Holdings Limited | Other services | 1998 |
| Turkish Cutz Ltd | Other services | 2025 |
| Turnbull Development Midlands Limited | Real estate | 2022 |
| Turnbull Property Development Limited | Construction | 2015 |
| Tuudae Ltd | Professional & scientific | 2019 |
| TUV Rheinland Industrial Services Limited | Professional & scientific | 2022 |
| TUV Rheinland UK Limited | Professional & scientific | 1999 |
| TVS Hatsup Ltd. | Professional & scientific | 2011 |
| Twag and Sons Limited | Construction | 2015 |
| TWD Partners Limited | Professional & scientific | 2015 |
| Twelve TEX Global Ltd | Wholesale & retail | 2019 |
| TWH Construction Ltd | Construction | 2019 |
| Twigden Homes Limited | Construction | 1987 |
| Twigden Homes Southern Limited | Extraterritorial | 1996 |
| Twin Stars Property Management Limited | Real estate | 2023 |
| Twisted Ember Ltd | Information & communication | 2025 |
| Twisted Retail Ltd | Wholesale & retail | 2012 |
| TWL Developments Ltd | Construction | 2025 |
| TWM Partnership Ltd | Professional & scientific | 1998 |
| Two Cranes Construction Ltd | Construction | 2023 |
| Two Happy Cats Ltd | Information & communication | 2024 |
| Two Minute Silence Limited | Professional & scientific | 2004 |
| Two Mirs Limited | Real estate | 2024 |