| Tenby House Management Company Limited | Households | 2014 |
| THE Admiral's Barge Ltd | Real estate | 2016 |
| THE Barkwell Cure House Ltd | Hospitality | 2025 |
| THE Copper Key North Tawton Ltd | Hospitality | 2024 |
| THE Dartmoor (Watervale) Ltd | Hospitality | 2019 |
| THE Dartmoor Lime Company Ltd | Construction | 2006 |
| THE Dartmoor Soap Company Ltd | Wholesale & retail | 2019 |
| THE Delight Makers Foundation | Arts & recreation | 2009 |
| THE Delight Makers Ltd | Arts & recreation | 2009 |
| THE Design Station Limited | Manufacturing | 2003 |
| THE Edge Effect Collective CIC | Agriculture & fishing | 2026 |
| THE Education Publishing Company Limited | Information & communication | 1996 |
| THE Fell Partnership Ltd | Wholesale & retail | 2004 |
| THE Flatman Partnership (South) Limited | Real estate | 2007 |
| THE Goddess and the Green MAN Limited | Education | 2015 |
| THE Hypnotherapy Research Society Limited | Extraterritorial | 2012 |
| THE Lekker Lounge Ltd | Hospitality | 2025 |
| THE Lighting Laboratory Limited | Wholesale & retail | 2016 |
| THE London Inn Okehampton Ltd | Hospitality | 2024 |
| THE Moorlander Limited | Professional & scientific | 2018 |
| THE Mughals Property Investments Limited | Real estate | 2020 |
| THE Mughals Trading Limited | Wholesale & retail | 2012 |
| THE New Okey Cokey Ltd | Hospitality | 2017 |
| THE Northlew Distillery Ltd | Manufacturing | 2018 |
| THE Old Mill Residents Association Limited | Administrative & support | 1986 |
| THE Pastures (Bratton Clovelly) Management Limited | Households | 2001 |
| THE People's Earth Ltd | Wholesale & retail | 2022 |
| THE Personalised Wedding Company Ltd | Wholesale & retail | 2017 |
| THE Pretty Pash Company Ltd | Wholesale & retail | 2016 |
| THE Retreat Hydro Ltd | Professional & scientific | 2017 |
| THE Safe Space - Sensorium CIC | Arts & recreation | 2025 |
| THE Scarf and BAG Company Limited | Wholesale & retail | 2025 |
| THE Shower Toilet Company Ltd | Wholesale & retail | 2018 |
| THE Thomas King Company Ltd | Extraterritorial | 2014 |
| THE Tors Inn Limited | Hospitality | 2019 |
| THE Traditional Building and Restoration Company Ltd | Construction | 2009 |
| THE Useful Dog Ltd | Wholesale & retail | 2025 |
| THE Value Engine Ltd | Professional & scientific | 2020 |
| THE Wellness Room Dartmoor Ltd | Other services | 2023 |
| Think Property Solutions Ltd | Construction | 2013 |
| Thurston Consulting Limited | Professional & scientific | 2015 |
| Tiger Tailoring and Services Ltd | Wholesale & retail | 2026 |
| Tilleystaxidevon Ltd | Transport & logistics | 2025 |
| Timmy Loves Company Limited | Professional & scientific | 2024 |
| Tintagel Brewery Limited | Manufacturing | 2006 |
| TJB Autoservices Limited | Wholesale & retail | 2013 |
| TKA Firestopping Specialists Ltd. | Construction | 2014 |
| TLC Care(Uk) Limited | Health & social care | 2014 |
| TLN Developments Limited | Construction | 2018 |
| TM Accounting Ltd | Professional & scientific | 2010 |
| TML Machinery Limited | Wholesale & retail | 2016 |
| Toben Plant Ltd | Administrative & support | 2017 |
| Tobias Developments Limited | Construction | 1987 |
| TOM Cobley Tavern (Spreyton) Limited | Hospitality | 2013 |
| TOM Smith Farrier Ltd | Agriculture & fishing | 2023 |
| Tomi Tilling Ltd | Construction | 2014 |
| Tors Vodka Limited | Manufacturing | 2015 |
| Total Plumbing Services (London) Limited | Construction | 2005 |
| Total Recycling Ltd | Water & waste | 2016 |
| Tower Enterprises Limited | | 1980 |
| Town Farm Court Management Limited | Real estate | 2002 |
| Town Mouse Bikes Ltd | Wholesale & retail | 2021 |
| Trace Timber Ltd | Professional & scientific | 2015 |
| Tracker Foods Limited | Wholesale & retail | 2000 |
| Tractours Limited | Other services | 2025 |
| Trafalgar Close (Lewdown) Management Company Limited | Households | 2022 |
| Trailer Servicing South West Ltd | Wholesale & retail | 2021 |
| Treasure Tree Limited | Wholesale & retail | 2010 |
| Trebarwith Wind Limited | Energy | 2013 |
| Treetops Preschool and Extended Schools Provision CIC | Education | 2017 |
| Triacle Limited | Professional & scientific | 2009 |
| Tristanza Limited | Information & communication | 2023 |
| True Refined Performance Ltd | Wholesale & retail | 2021 |
| Tubby Professional Services Limited | Professional & scientific | 2022 |
| Two Rivers Psychology Ltd | Education | 2025 |
| Two Tigers Fireworks Ltd | Arts & recreation | 2006 |
| Two Tigers Holding Limited | Arts & recreation | 2025 |
| Tyred & Exhausted (Okehampton) Limited | Wholesale & retail | 2008 |
| Uberorganoboy Ltd | Information & communication | 2014 |
| Uncommon Blue Ltd | Professional & scientific | 2024 |
| Upcott Management Ltd | Households | 2017 |
| Upcott Property Management Ltd | Households | 2022 |
| Uphill Products Limited | Wholesale & retail | 2019 |
| V22 Solutions Ltd | Professional & scientific | 2026 |
| Vermigo Limited | Administrative & support | 2020 |
| Vertical Impressions Ltd | Manufacturing | 2026 |
| Vickery Design Limited | Professional & scientific | 2022 |
| Vinnig.Co.Uk Ltd | Transport & logistics | 2024 |
| Visit Dartmoor Limited | Information & communication | 2014 |
| Visual Information Services Limited | Other services | 1992 |
| Vuks Estate Ltd | Real estate | 2023 |
| Waite's Groundworks & Concreting Limited | Construction | 2015 |
| Ware Jones Properties Limited | Real estate | 2026 |
| Warren Agri Tech Ltd | Agriculture & fishing | 2026 |
| Watson Financial Limited | Financial services | 2009 |
| WE the Recruiters Limited | Administrative & support | 2025 |
| Wealden Associates Limited | Professional & scientific | 1998 |
| Wealth Harbour Services Ltd | Financial services | 2012 |
| Webber Transport Limited | Transport & logistics | 2003 |
| Webcliq CIC | Information & communication | 2024 |