| Tangelo Motor Company Limited | Wholesale & retail | 2021 |
| Tangerine BEE Limited | Professional & scientific | 2005 |
| Tangerine Limited | Professional & scientific | 2003 |
| Tangible (London) Limited | Real estate | 2005 |
| Tangled UP in Blue Limited | Construction | 1993 |
| Tanotive Ltd | Real estate | 2019 |
| Tansys Limited | Administrative & support | 2014 |
| Tanvia Ltd | Real estate | 2025 |
| TAO Clinic Ltd | Other services | 2026 |
| Tapas Hamper Ltd | Wholesale & retail | 2024 |
| Tapitapa Ltd | Hospitality | 2019 |
| Tarcg Holdings Limited | Financial services | 2024 |
| Target Commercial Services Ltd | Administrative & support | 2017 |
| Tarka Agricultural Services Limited | Manufacturing | 2023 |
| Tarka Holdings Ltd | Financial services | 2022 |
| Tarka Living Limited | Construction | 2021 |
| Tarka Metals Ltd | Water & waste | 2025 |
| Tarka Residents Management Company Limited | Households | 2026 |
| Tasev Limited | Hospitality | 2025 |
| Taste of India Private Ltd | Wholesale & retail | 2025 |
| Taste of Sidmouth Ltd | Hospitality | 2015 |
| Tasting China Limited | Hospitality | 2014 |
| Tasty Solutions Ltd | Real estate | 2019 |
| Taunton Innovations Limited | Professional & scientific | 2019 |
| Taunton School of Motorcycling Limited | Education | 2003 |
| Taurus Aviation Limited | Professional & scientific | 2023 |
| Tautology Properties Limited | Real estate | 2011 |
| Tavern & Trade Co. Limited | Wholesale & retail | 2026 |
| Taverner Holdings (Devon) Ltd | Financial services | 2022 |
| Taverns and Inns Limited | Hospitality | 2018 |
| Tavistock Accident Repair Centre Limited | Wholesale & retail | 2013 |
| TAW View Management Company Limited | Households | 2016 |
| Tawakali Limited | Hospitality | 2023 |
| Tawdriving Ltd | Education | 2025 |
| Taxi Operatives Ltd | Transport & logistics | 2021 |
| Taxi's Inc. Ltd | Transport & logistics | 2020 |
| Taxi's to Go Ltd | Transport & logistics | 2019 |
| TAY Living Ltd | Real estate | 2025 |
| Taylor & Melling Properties Ltd | Real estate | 2022 |
| Taylor Construction Management Ltd | Construction | 2021 |
| Taylor Lewis Limited | Professional & scientific | 2009 |
| Taylor Made Nails Limited | Other services | 2013 |
| Taylor Property Investments Ltd | Real estate | 2018 |
| Taylor Square (Devon) Management Company Ltd | Households | 2025 |
| Taylor's Joinery (UK) Limited | Construction | 2014 |
| Taylored Flooring Co SW Limited | Construction | 2025 |
| Tazma Limited | Information & communication | 2010 |
| TBC Holdings (Plymouth) Limited | Hospitality | 2011 |
| Tbhouse Ltd | Wholesale & retail | 2019 |
| TBR Construction Limited | Construction | 2018 |
| TBS Creative Group Ltd | Manufacturing | 2025 |
| TC Camper Services Ltd | Manufacturing | 2024 |
| TCL (NW) Ltd | Professional & scientific | 2018 |
| TCR 123 Ltd | Financial services | 2024 |
| TCR Housing Ltd | Construction | 2020 |
| Tcth Limited | Extraterritorial | 2007 |
| Tdrl Ltd | Real estate | 2016 |
| TDS Deliverys Limited | Transport & logistics | 2013 |
| Tea on the Green Ltd | Hospitality | 2012 |
| Team Financial Services Limited | Financial services | 1999 |
| Team H Investments Limited | Real estate | 2018 |
| Team Independent Services Limited | Transport & logistics | 2005 |
| Team NTS Limited | Arts & recreation | 2024 |
| Team Property Investment Limited | Real estate | 2018 |
| Team Railway Limited | Hospitality | 2022 |
| Tean's Thai Kitchen Ltd | Hospitality | 2019 |
| Tech 8 Developments Limited | Extraterritorial | 2021 |
| Tech 8 Homes Limited | Extraterritorial | 2021 |
| Tech 8 Limited | Real estate | 2021 |
| Tech Exeter CIC | Administrative & support | 2016 |
| Tech South West Limited | Information & communication | 2019 |
| Tech Talents Ltd | Information & communication | 2021 |
| Tech-That Limited | Administrative & support | 2008 |
| Techloadpro Ltd | Extraterritorial | 2020 |
| Technical Health Limited | Information & communication | 2015 |
| Technical Hires Group Ltd | Administrative & support | 2024 |
| Technical Insight Ltd | Professional & scientific | 2005 |
| Technoclasm Ltd | Information & communication | 2014 |
| Techumbre Limited | Construction | 2015 |
| TED Baron Limited | Health & social care | 2015 |
| Tedxexeter Ltd | Administrative & support | 2017 |
| Teega Ltd | Manufacturing | 2025 |
| Teeugo Ventures Limited | Health & social care | 2024 |
| Tegula Holdings Ltd | Financial services | 2025 |
| Teign Bean Ltd | Hospitality | 2020 |
| Teign Construction and Renovation Limited | Construction | 2016 |
| Teign Greens CIC | Agriculture & fishing | 2020 |
| Teign Hockey Club Limited | Arts & recreation | 2010 |
| Teign House Inn Ltd | Hospitality | 2016 |
| Teign Properties Ltd | Real estate | 2020 |
| Teign Tech Ltd | Information & communication | 2026 |
| Teign Valley Building Company Limited | Construction | 2014 |
| Teign Valley Larder CIC | Hospitality | 2020 |
| Teignvale Farm Machinery Limited | Wholesale & retail | 2023 |
| Teignvale Plumbing & Heating Ltd | Construction | 2013 |
| Teknicode Ltd | Information & communication | 2022 |
| Telepresent Ltd | Information & communication | 2020 |
| Tempgrid Ltd | Administrative & support | 2016 |
| Templar Supplies Limited | Wholesale & retail | 2018 |
| Temporary Works Installations Limited | Construction | 2014 |