| Titan Elysian Ltd | Arts & recreation | 2022 |
| Titans Coaching and Wellbeing Ltd | Education | 2020 |
| Tiva Consulting Limited | Professional & scientific | 2020 |
| Tiverton and District Model Engineering Society Limited | Other services | 1996 |
| Tivoli Media Limited | Extraterritorial | 2011 |
| TJ Commercial Property Limited | Real estate | 2022 |
| TJ Construction (Staplegrove) Limited | Financial services | 2021 |
| TJ Dogs Ltd | Real estate | 2023 |
| TJ Lighting Ltd | Wholesale & retail | 2020 |
| TJ Quality Solutions Ltd | Professional & scientific | 2019 |
| TJP Enterprises Ltd | Construction | 2024 |
| TJS Gardening and Ground Maintenance Services Ltd | Administrative & support | 2021 |
| TLE Sports Coaching Limited | Arts & recreation | 2010 |
| TLF Specialist Finance Limited | Financial services | 2024 |
| TLF Wealth Management Ltd | Financial services | 2023 |
| TM Hughes Property Consultants Ltd | Professional & scientific | 2024 |
| TMA Healthcare Limited | Extraterritorial | 2018 |
| TMC Taxis Limited | Transport & logistics | 2025 |
| TME (South West) Limited | Information & communication | 1997 |
| Tmer Management Company Limited | Households | 2026 |
| TMF Computing Limited | Information & communication | 2005 |
| TML Properties Limited | Real estate | 2013 |
| TNT Taxis Taunton Ltd | Transport & logistics | 2016 |
| Todays Dental Group Limited | Financial services | 2021 |
| Todays Dental Management Limited | Health & social care | 2021 |
| Todays Dental Practices Limited | Health & social care | 2021 |
| Todays Dental SPL Limited | Health & social care | 2015 |
| Todoplex Ltd | Wholesale & retail | 2022 |
| Toft Farm Growers Limited | Agriculture & fishing | 2016 |
| Tokyo M Ltd | Health & social care | 2024 |
| TOM Festing Services Ltd | Agriculture & fishing | 2020 |
| TOM Yeoman Ltd | Construction | 2022 |
| TOMBANTON18 Ltd | Arts & recreation | 2019 |
| Tomorrow Consulting Limited | Administrative & support | 2017 |
| Tone Estates Limited | Administrative & support | 2022 |
| Tone Fire & Security Limited | Administrative & support | 2016 |
| Tone Gate Motors Limited | Wholesale & retail | 1987 |
| Tone Heating Ltd | Construction | 2020 |
| Tone Insulation Limited | Construction | 2006 |
| Tone Retreat Ltd | Other services | 2025 |
| Tone Town Accounting Limited | Professional & scientific | 2016 |
| Tone Vale Limited | Information & communication | 2020 |
| Tonebridge Ltd | Real estate | 2025 |
| Tonewave App Ltd | Professional & scientific | 2023 |
| Toneway Patient Transport Ltd | Transport & logistics | 2025 |
| Tonkin Advisory Limited | Professional & scientific | 2024 |
| Tony Brooke Carpet & Flooring Ltd | Wholesale & retail | 2016 |
| Toolands Limited | Hospitality | 2025 |
| Top Sires Select Limited | Agriculture & fishing | 2005 |
| Topnotch Geodata Ltd | Information & communication | 2023 |
| Topol Ltd | Construction | 2017 |
| Topsham Brewery Ltd | Manufacturing | 2018 |
| Topsham Medical Services Limited | Health & social care | 2020 |
| Topvibe Limited | Extraterritorial | 2012 |
| TOR View Court RTM Company Ltd | Households | 2019 |
| Toshev Dent Ltd | Health & social care | 2019 |
| Total Aluminium Holdings Limited | Financial services | 2021 |
| Total Aluminium Systems Limited | Manufacturing | 2002 |
| Total Bathrooms (SW) Limited | Construction | 2024 |
| Total Flooring Solutions Southwest Limited | Construction | 2016 |
| Total Triumph (Taunton) Limited | Wholesale & retail | 2008 |
| Total Vans (Somerset) Ltd | Wholesale & retail | 2018 |
| Towards Tomorrow Together | Health & social care | 2012 |
| Town & Country Electrical Services Limited | Construction | 2007 |
| Town Centre Parking Matters Limited | Real estate | 2026 |
| Townley Insurance Brokers Limited | Financial services | 2013 |
| Townsend Farm Barns Management Company Limited | Households | 2016 |
| Townsend Letting & Management Ltd. | Real estate | 2015 |
| TPC Property Group Ltd | Construction | 2025 |
| TR Stockfencing Ltd | Administrative & support | 2025 |
| Track Golf Ltd | Arts & recreation | 2026 |
| Track My Claim Ltd | Extraterritorial | 2013 |
| Tracks Safaris Limited | Administrative & support | 2009 |
| Traction Ltd | Professional & scientific | 2024 |
| Trade Centre Group Limited | Wholesale & retail | 2022 |
| Trade Chamber Limited | Wholesale & retail | 2020 |
| Tradesmenai Ltd | Information & communication | 2023 |
| Tradewinds Engineering Limited | Manufacturing | 2010 |
| Trading and Retail Ltd | Wholesale & retail | 2023 |
| Traditional Chinese Medicine Limited | Wholesale & retail | 2013 |
| Trafalgar Fortelli Limited | Financial services | 2024 |
| Trailblazers U.K. Farming Limited | Agriculture & fishing | 2000 |
| Traipse Go Limited | Administrative & support | 2024 |
| Trajectory Services Limited | Wholesale & retail | 2025 |
| Trans Moldavia Ltd | Construction | 2014 |
| Transform Construction Ltd | Construction | 2021 |
| Transformotion Limited | Education | 2015 |
| Transinternational Container Services Ltd | Administrative & support | 2007 |
| Transport Systems (Holdings) Limited | Professional & scientific | 2019 |
| Transport Systems (Western) Limited | Wholesale & retail | 1980 |
| Transquip Group Limited | Administrative & support | 2021 |
| Trebarwith Hotel (1952) Limited | Real estate | 1952 |
| Trebor Building Limited | Construction | 2021 |
| Trebor Property Limited | Real estate | 2022 |
| Tred Properties Ltd | Real estate | 2025 |
| Treeaura | Other services | 2017 |
| Treemans Ltd | Agriculture & fishing | 2017 |
| Trees and Fencing General Landscapes Limited | Administrative & support | 2024 |
| Tregenna Commercials (SPV 13) Ltd | Construction | 2022 |
| Tregenna Developments (SPV) Ltd | Construction | 2023 |