| Syntheva AS | Information & communication | 2024 |
| Sør-Trøndelag Trykk AS | Manufacturing | 1998 |
| T&K Eiendom AS | Real estate | 2024 |
| T&K Holding AS | Wholesale & retail | 1984 |
| T-K Bygg Og Eiendom AS | Administrative & support | 2021 |
| Taksthuset Orkland AS | Professional & scientific | 2024 |
| Takstmann Knut Sagberg AS | Professional & scientific | 1998 |
| Tangvik AS | Transport & logistics | 2019 |
| Tannlegene På Torgsenteret AS | Health & social care | 2011 |
| Technova AS | Information & communication | 2014 |
| Teknobingo Orkanger AS | Arts & recreation | 2007 |
| Tellefsen Og Nyberg Entreprenør Ans | Construction | 1990 |
| Tempo Underholdning AS | Arts & recreation | 2013 |
| Tenga AS | Professional & scientific | 2012 |
| Thai Thai Orkanger AS | Hospitality | 2019 |
| Thams Eiendomsutvikling AS | Real estate | 2014 |
| Thams Innovasjon AS | Professional & scientific | 2001 |
| Thamshavn Eiendom AS | Real estate | 2019 |
| Tolo Orkdal AS | Wholesale & retail | 2019 |
| Tor Solem Adventure AS | Information & communication | 2013 |
| Torstensen Consulting AS | Professional & scientific | 2011 |
| Ttmc AS | Administrative & support | 2019 |
| Tuja Holding AS | | 2021 |
| Utevent AS | Administrative & support | 2019 |
| Varig Orkla Forsikring Gjensidig | Financial services | 1844 |
| Vatn Maritim & Teknisk Service AS | Manufacturing | 2018 |
| VCS - Vigor Coat Services AS | Manufacturing | 2017 |
| Vesr Holding AS | | 2022 |
| Vigor AS | Professional & scientific | 2024 |
| Vigor Eiendom AS | Real estate | 2022 |
| Vigor Industrier AS | Administrative & support | 1990 |
| Vigor Kontor Og Boligrigg Ans | Real estate | 1995 |
| Vigor Verksted AS | Manufacturing | 2022 |
| Vorma AS | Real estate | 2025 |
| Vormstad Bil AS | Other services | 1998 |
| Vormstad Bil Holding AS | Other services | 2017 |
| Vormstad Utbyggingsselskap AS | Real estate | 2004 |
| Washington Mills AS | Manufacturing | 2006 |
| Wawo AS | Health & social care | 2021 |
| Weld Partner AS | Manufacturing | 2010 |
| Wigran AS | | 2024 |
| Wuttudal & Flaaskog Invest AS | Real estate | 2005 |
| Wåtland Kran Og Transport AS | Transport & logistics | 2002 |
| Y.Bakken Holding AS | | 2025 |
| Ytre Moan Eiendom AS | Real estate | 2022 |
| Øje Holding AS | | 2017 |
| Øklend Holding AS | | 2026 |
| Ølen Betong Gjølme AS | Manufacturing | 1995 |
| Ørland Byggtjenester AS | Construction | 2023 |
| Øyvind Bakken Holding AS | | 2021 |