| SYO Valeting Ltd | Administrative & support | 2023 |
| Systems and Consultancy Services Ltd | Construction | 2020 |
| T & C Charge Points Limited | Construction | 2021 |
| T & C Electrical Contractors Limited | Construction | 2000 |
| T & J Stainer Limited | Agriculture & fishing | 2000 |
| T & N Auto's Ltd | Wholesale & retail | 2024 |
| T a Agri Ltd | Manufacturing | 2019 |
| T G Roofing Limited | Construction | 1999 |
| T H Construction (Southwest) Ltd | Construction | 2023 |
| T H Lock & Sons Limited | Construction | 2003 |
| T M Safety Signs Ltd | Manufacturing | 1997 |
| T N B Financial Limited | Financial services | 2004 |
| T P Watts Limited | Professional & scientific | 2010 |
| T&L Horsey Limited | Financial services | 2022 |
| T&M (Swindon) Limited | Real estate | 2024 |
| T'A Promis Limited | Wholesale & retail | 2023 |
| T.B. Alloy Wheel Repairs Ltd | Wholesale & retail | 2021 |
| T.F.Timbers Limited | Construction | 2018 |
| T.F.Tools Limited | Wholesale & retail | 2012 |
| T.Griffiths Holdings Limited | Construction | 2019 |
| T.J. Purdy Ltd. | Construction | 1995 |
| T.S.Penny(Property Development)Limited | Real estate | 1960 |
| T.T.Investments Limited | Real estate | 1962 |
| T.T.R. Developments Limited | Construction | 1988 |
| T3 Merchant Services LLP | | 2026 |
| TA Jade Limited | Hospitality | 2024 |
| TA1 Computer Shop Ltd | Wholesale & retail | 2023 |
| TA1 Holdings Ltd | Real estate | 2026 |
| TA1 MAC Store Ltd | Wholesale & retail | 2023 |
| TA1 Renewed Ltd | Wholesale & retail | 2020 |
| TA9 Truck Tyres Limited | Wholesale & retail | 2024 |
| Tacsecure Ltd. | Administrative & support | 2014 |
| Taekke Ltd | Health & social care | 2015 |
| Tailored Business Solutions Ltd | Professional & scientific | 2016 |
| Tails of Ashgate (Pet Services) Ltd | Other services | 2023 |
| Takevisuals Ltd | Information & communication | 2024 |
| Tale Twisters Ltd | Professional & scientific | 2026 |
| Talent Pool Recruitment Limited | Administrative & support | 2024 |
| Talestris Limited | Construction | 2011 |
| Talk Support Ltd | Health & social care | 2020 |
| Tallwood Homes Ltd | Construction | 2019 |
| Tandartspraktijk Steenwijkerdiep LLP | | 2016 |
| Tango Alpha Glass Repairs Ltd | Wholesale & retail | 2023 |
| Tanner & John Developments Ltd | Real estate | 2026 |
| Tanyx Ltd | Health & social care | 2023 |
| Tanzer Enterprises Limited | Professional & scientific | 2019 |
| Taone Limited | Information & communication | 2014 |
| TAP Business Ltd | Wholesale & retail | 2024 |
| Tarba Ltd | Professional & scientific | 2025 |
| Target 28 Ltd | Real estate | 2024 |
| Target Developments (Somerset) Limited | Construction | 2015 |
| Tarr Financial Limited | Financial services | 2009 |
| Tarr Steps Associates Ltd | Real estate | 2023 |
| TAS Global Services Ltd | Administrative & support | 2023 |
| Tash by Design Ltd | Professional & scientific | 2024 |
| Tasman Select Limited | Wholesale & retail | 2016 |
| Tasty Chicken Taunton Ltd | Hospitality | 2021 |
| TAU Accountancy Limited | Professional & scientific | 2025 |
| Taudevin Ltd | Real estate | 2020 |
| Taudevin Property Ltd | Real estate | 2025 |
| Taun-Tech Ltd | Construction | 2022 |
| Taungo Taxis Ltd | Transport & logistics | 2026 |
| Tauntfield Holdings Ltd | Financial services | 2016 |
| Tauntfield Ltd | Construction | 1998 |
| Taunton & Pickeridge Golf Club Limited | Arts & recreation | 2015 |
| Taunton & Somerset Armed Forces Day CIC | Hospitality | 2021 |
| Taunton and District Carnival Committee Limited | Other services | 1994 |
| Taunton Blinds Limited | Wholesale & retail | 2019 |
| Taunton Buffet Ltd | Hospitality | 2025 |
| Taunton Cabs and Private Hire Ltd | Transport & logistics | 2024 |
| Taunton Caravan Services Limited | Manufacturing | 1982 |
| Taunton Carpets and Flooring Limited | Extraterritorial | 2006 |
| Taunton Cars Ltd | Wholesale & retail | 2023 |
| Taunton Collaborative Arts C.I.C. | Arts & recreation | 2026 |
| Taunton DAB Limited | Information & communication | 2025 |
| Taunton Deane Horticultural and Floricultural Society | Other services | 2004 |
| Taunton Distilling Company Ltd | Manufacturing | 2024 |
| Taunton Doctors Limited | Health & social care | 2016 |
| Taunton Dog Park Limited | Arts & recreation | 2021 |
| Taunton East Development Trust | Other services | 2003 |
| Taunton Eats Ltd | Administrative & support | 2025 |
| Taunton Electrical Solutions Limited | Construction | 2019 |
| Taunton Electrician Ltd | Construction | 2025 |
| Taunton Fabrications Limited | Manufacturing | 2000 |
| Taunton Feast Limited | Hospitality | 2024 |
| Taunton Food Centre Ltd | Hospitality | 2015 |
| Taunton Funeral Services Limited | Other services | 2008 |
| Taunton Health Spa Ltd | Other services | 2022 |
| Taunton Heating & Plumbing Limited | Construction | 2011 |
| Taunton House Hotel (Holdings) Limited | Financial services | 2023 |
| Taunton House Hotel Limited | Hospitality | 2009 |
| Taunton Independent Market Ltd | Other services | 2024 |
| Taunton Joinery Holdings Limited | Professional & scientific | 2017 |
| Taunton Lactation Care C.I.C. | Health & social care | 2024 |
| Taunton Land Limited | Real estate | 1976 |
| Taunton Leisure (Holdings) Limited | Financial services | 2008 |
| Taunton Leisure Limited | Wholesale & retail | 1998 |
| Taunton Line Dancers CIC | Arts & recreation | 2025 |
| Taunton Minibuses Ltd | Transport & logistics | 2007 |
| Taunton Miniskips Ltd | Water & waste | 2017 |