| THE Sports Barn Ltd | Arts & recreation | 2025 |
| THE Stables Management Company (Huntsham) Limited | Households | 2011 |
| THE Tiverton Co-Operative Learning Partnership | Education | 2012 |
| THE Tors Management Company Limited | Households | 2016 |
| THE White House Future Ltd | Professional & scientific | 2014 |
| Thecurtisco Limited | Hospitality | 2023 |
| Theeventapp Ltd | Information & communication | 2020 |
| Third Millennium Energy Ltd. | Manufacturing | 2005 |
| Third of MAY Limited | Financial services | 2020 |
| Third Sector Design Ltd | Information & communication | 2009 |
| Thormec - UK Limited | Manufacturing | 2005 |
| Thorne's Tipper Limited | Construction | 2020 |
| Thorverton Cricket Club Ltd | Arts & recreation | 2014 |
| Three Counties Finance Ltd | Financial services | 2011 |
| Three Oaks Poultry Ltd | Agriculture & fishing | 2025 |
| Throwcombe Park LLP | | 2016 |
| Thunderbox Collective Limited | Manufacturing | 2005 |
| Tick Box Modular Limited | Manufacturing | 2023 |
| Ticko Media Limited | Extraterritorial | 2020 |
| Tidcombe FEN Society Limited | Agriculture & fishing | 2001 |
| Tide and Trove Ltd | Manufacturing | 2022 |
| Tilma Ltd | Health & social care | 2013 |
| TIM Dalby Consulting Limited | Health & social care | 2011 |
| Tim's Garden Rescue Service Ltd | Construction | 2024 |
| Time for YOU Dorset Ltd | Administrative & support | 2023 |
| Tinker Bells Cleaning Ltd | Administrative & support | 2026 |
| Titan Bioenergy Ltd | Energy | 2024 |
| Tiverton & Taunton Flooring Limited | Wholesale & retail | 2009 |
| Tiverton Adventure Play | Arts & recreation | 2011 |
| Tiverton Almshouse Trustee Limited | Professional & scientific | 2014 |
| Tiverton Canal Company Ltd | Transport & logistics | 2007 |
| Tiverton Car Wash Ltd | Other services | 2018 |
| Tiverton Community Association CIC | Other services | 2025 |
| Tiverton Dog Centre Grooming Ltd | Other services | 2023 |
| Tiverton Dog Centre Ltd | Health & social care | 2021 |
| Tiverton Nails & Spa Limited | Other services | 2025 |
| Tiverton Portas Company Limited | Other services | 2014 |
| Tiverton Spice Ltd | Hospitality | 2026 |
| Tiverton Town Association Football Club Limited | Extraterritorial | 2006 |
| Tiverton United Limited | Construction | 2026 |
| Tivvyskips Limited | Water & waste | 2012 |
| TJ Mccabe Ltd | Agriculture & fishing | 2006 |
| TJV Trading Limited | Administrative & support | 2015 |
| TMK Barbers Ltd | Other services | 2019 |
| TML Catering Services Ltd | Hospitality | 2025 |
| TMR Cleaning Services Ltd | Administrative & support | 2023 |
| Tobin Health Ltd | Wholesale & retail | 2014 |
| Tocc Work Ltd | Education | 2020 |
| Tomato Bar Ltd | Hospitality | 2026 |
| Torridge View (Bideford) Apartments Management Company Limited | Households | 2014 |
| Total Business Consultants Ltd | Wholesale & retail | 2011 |
| Townlands Estate Management Company Limited | Households | 1983 |
| TR Kayaks Ltd | Wholesale & retail | 2014 |
| Trading Services South West Ltd | Administrative & support | 2021 |
| Trafalgar Estates Budleigh Limited | Construction | 2018 |
| Trafalgar Estates Limited | Real estate | 1995 |
| Training in Construction (TIC) SW Limited | Construction | 2023 |
| Transforming Futures Multi Academy Trust Limited | Education | 2016 |
| Transport Industry & Vehicle Operation Consultants Limited | Professional & scientific | 1984 |
| Treco Limited | Construction | 2006 |
| Treehorn Pictures Ltd | Information & communication | 2025 |
| Trust in Art Limited | Extraterritorial | 1990 |
| Tseb Limited | Information & communication | 2011 |
| Tutto MD Ltd | Hospitality | 2024 |
| Twenty Twenty Property (SW) Ltd | Real estate | 2019 |
| Two Moors Electrical & Property Services Ltd | Construction | 2021 |
| Two Suns Tea Ltd | Wholesale & retail | 2025 |
| Twostop Ltd | Wholesale & retail | 2021 |
| Twyford Court Property Limited | Real estate | 2016 |
| Tyrrell Studio Ltd | Administrative & support | 2025 |
| UK 4 X 4 Centres Limited | Wholesale & retail | 2000 |
| UK Alpaca Limited | Manufacturing | 2005 |
| UK Baghdadi Limited | Health & social care | 2023 |
| UK Biogas Holdings Ltd | Professional & scientific | 2018 |
| UK Biogas Ltd | Professional & scientific | 2021 |
| Ukbox Boxing Equipment Ltd | Wholesale & retail | 2026 |
| Ulfstag Leather Ltd | Manufacturing | 2026 |
| Union Management Services LLP | | 2002 |
| Unique Marketing Limited | Wholesale & retail | 2010 |
| Unique Service Group Limited | Wholesale & retail | 2019 |
| United Fixings Limited | Wholesale & retail | 2013 |
| United Holdings (SW) Limited | Financial services | 2024 |
| United Through Sport Limited | Professional & scientific | 2013 |
| Upton Coaches Limited | Transport & logistics | 2008 |
| UWU Ltd | Information & communication | 2019 |
| VA Accountancy Limited | Professional & scientific | 2016 |
| Van MAN Removals and Storage Ltd | Transport & logistics | 2016 |
| Van Modifications UK Ltd | Wholesale & retail | 2026 |
| Vapeguard Ltd | Wholesale & retail | 2024 |
| Vasil Enterprise Limited | Construction | 2026 |
| Versatile Property Holdings Limited | Real estate | 2025 |
| Versatile Tiling Services Limited | Construction | 2025 |
| Vertiscapes Limited | Extraterritorial | 2021 |
| Vida GM Limited | Real estate | 2025 |
| Viene Ltd | Financial services | 2026 |
| Vintage Youth Ltd | Information & communication | 1997 |
| Vision Payment Solutions Ltd | Administrative & support | 2023 |
| Viva Construction Limited | Real estate | 2003 |
| Vixen Estates Ltd | Construction | 2016 |
| VR Visuals Ltd | Construction | 2021 |