| TOM and Sobha Company Limited | Health & social care | 2015 |
| TOM Carrington Properties Limited | Real estate | 2017 |
| TOM Garden Limited | Hospitality | 2024 |
| TOM Hartill Ltd | Information & communication | 2025 |
| TOM Murphy Construction Ltd | Construction | 2022 |
| Tomax Building Services Limited | Construction | 2000 |
| Tomboy Lager Limited | Wholesale & retail | 2025 |
| Tomholmes Ltd | Manufacturing | 2025 |
| Tomkins of Walsall Limited | Transport & logistics | 2004 |
| Tomlinson (Walsall) Limited | Real estate | 1984 |
| Tomlinson Bros. (Sedgley) Limited | | 1950 |
| Tomrider Ltd | Transport & logistics | 2017 |
| Tomtomeksz Ltd | Administrative & support | 2020 |
| Tonaks Ltd | Transport & logistics | 2025 |
| Tonarem Ltd | Administrative & support | 2024 |
| Tonfolkmear Ltd | Administrative & support | 2024 |
| Tonguestone Developments Ltd | Construction | 2007 |
| Tonguestone Limited | Construction | 2007 |
| Tonguestone Properties Limited | Construction | 2007 |
| Tonikad Ventures Limited | Wholesale & retail | 2013 |
| Tony Hague Consulting LLP | | 2025 |
| Tony Phillips Construction Services Ltd | Construction | 2015 |
| Tony Sharif General Insurance Services Limited | Financial services | 2004 |
| Tonyrider Ltd | Transport & logistics | 2021 |
| TOO Perfect Hair Extensions Ltd | Other services | 2013 |
| Toolbase Ltd | Construction | 2018 |
| Toolmarque Limited | Professional & scientific | 2000 |
| Toor Logistics Limited | Transport & logistics | 2022 |
| Tooth Fairy Healthcare Ltd | Health & social care | 2017 |
| Toothfairy Edgbaston Ltd | Health & social care | 2024 |
| Toothfairy London Clinic Ltd | Health & social care | 2024 |
| Toothfairy Mobile Ltd | Health & social care | 2025 |
| TOOTHHURTEY4U Ltd | Health & social care | 2022 |
| Top Blade Barbers Ltd | Other services | 2026 |
| Top C Ltd | Hospitality | 2019 |
| Top Car Seals Limited | Wholesale & retail | 2025 |
| Top Chef 84 Limited | Hospitality | 2026 |
| Top CUT Ltd | Other services | 2021 |
| Top Delight Limited | Hospitality | 2023 |
| Top Draw Graphic Design Associates Limited | Professional & scientific | 1996 |
| Top Drawer Finance Ltd | Professional & scientific | 2023 |
| Top Euro Store Ltd | Wholesale & retail | 2025 |
| Top Labels Online Ltd | Wholesale & retail | 2016 |
| Top Nails Studio Ltd | Other services | 2023 |
| Top Shop MS Ltd | Wholesale & retail | 2026 |
| Top Turkish Barbers QP Ltd | Other services | 2023 |
| Topcap Mushrooms Ltd | Agriculture & fishing | 2025 |
| Topclassbeauty Ltd | Wholesale & retail | 2025 |
| Topdrawermanagement Ltd | Professional & scientific | 2021 |
| Topline Graphics Limited | Professional & scientific | 2019 |
| Topp Shop Ltd | Wholesale & retail | 2024 |
| Topshop Stores Limited | Wholesale & retail | 2025 |
| Topsource Property Ltd | Real estate | 2025 |
| TOR Solutions Limited | Construction | 2018 |
| Toriamay Limited | Real estate | 2024 |
| Torquaytownhouse Limited | Hospitality | 2021 |
| Torrin Legal Consulting Limited | Professional & scientific | 2024 |
| Torvale House Ltd | Construction | 2022 |
| Tosnade Ltd | Administrative & support | 2020 |
| Tossyl Engineering Ltd | Construction | 2025 |
| Total Car Park Management Limited | Administrative & support | 2010 |
| Total Drain Solutions Ltd | Water & waste | 2020 |
| Total Drainage Solutions Ltd | Water & waste | 2021 |
| Total Finishing Ltd | Manufacturing | 2025 |
| Total GAS Services (Midlands) Ltd | Construction | 2020 |
| Total Hardware & Security Limited | Wholesale & retail | 1999 |
| Total Horizon Limited | Professional & scientific | 2025 |
| Total Laundry Solutions Ltd | Other services | 2019 |
| Total Maintenance Services (EBM) Ltd | Extraterritorial | 2021 |
| Total Moving Solutions Ltd | Transport & logistics | 2019 |
| Total Plan Ltd | Construction | 2010 |
| Total Property Solutions (SW) Ltd | Construction | 2020 |
| Total Standard Ltd | Wholesale & retail | 2026 |
| Total Training Providers Limited | Education | 2014 |
| Totality Wealth Limited | Financial services | 2022 |
| Tots in Need C.I.C. | Other services | 2021 |
| Touch of Lime Design Limited | Other services | 2011 |
| Touch the Spectrum Ltd | Other services | 2016 |
| Touchtight Coaching Ltd | Wholesale & retail | 2016 |
| Touchwood Kitchens and Interiors Limited | Manufacturing | 2026 |
| Tougher Furniture Ltd | Manufacturing | 2022 |
| Toward Infinity Ltd | Information & communication | 2018 |
| Tower 13 Limited | Wholesale & retail | 2015 |
| Tower Park Property Limited | Real estate | 2019 |
| Town to Town Transport Ltd | Transport & logistics | 2019 |
| Townrow Property Ltd | Real estate | 2017 |
| Townsend UK (Investments) Limited | Real estate | 2022 |
| Tprice&Sons Ltd | Water & waste | 2023 |
| Tpsp Ltd | Other services | 2021 |
| Tpxinspect Ltd | Professional & scientific | 2024 |
| TR Europe Limited | Professional & scientific | 1972 |
| TR Living Limited | Real estate | 2021 |
| TR3NITY Consulting Ltd | Wholesale & retail | 2026 |
| Trac Residential Ltd | Construction | 2025 |
| Tracia Home Design Ltd | Wholesale & retail | 2023 |
| Track Clean Solutions Ltd | Administrative & support | 2020 |
| Tracstar Ltd | Agriculture & fishing | 2025 |
| Trade & Travel Ltd | Wholesale & retail | 2024 |
| Trade EX Group Limited | Administrative & support | 2023 |
| Trade Fleet Sales Ltd | Wholesale & retail | 2025 |