| Tokyo Nordic AS | Information & communication | 2024 |
| Tom & Thomas Holding AS | Arts & recreation | 2018 |
| Topau Invest AS | | 2024 |
| Toppen 94 Holding AS | | 2025 |
| Torden Ans | Hospitality | 1996 |
| Tore Ligaard AS | Wholesale & retail | 1984 |
| Tores Holding AS | Wholesale & retail | 2005 |
| Torget Legekontor Stjørdal AS | Health & social care | 2018 |
| Torget Tannhelse AS | Health & social care | 2012 |
| Torstein Nordby Holding AS | Financial services | 2018 |
| Transportrådgivning AS | Education | 2021 |
| Transportrådgivning Utleie AS | Professional & scientific | 2024 |
| TRD Eiendom AS | Real estate | 2011 |
| Tre&Flis Design AS | Construction | 2022 |
| Treco AS | Manufacturing | 2005 |
| Treco Eiendom AS | Manufacturing | 1984 |
| Treco Holding AS | Manufacturing | 2005 |
| Tremi AS | Professional & scientific | 2026 |
| Treningssenteret Stjørdal AS | Arts & recreation | 2016 |
| Tresco Eiendom AS | Real estate | 1998 |
| Triangel Legesenter AS | Real estate | 2016 |
| Trippel Salto AS | Hospitality | 2022 |
| Trollbu Holding AS | | 2018 |
| Trolltoppen Holding AS | | 2025 |
| Trondheim Beauty Expo AS | Administrative & support | 2024 |
| Trondheimsfjord Båtutleie AS | Administrative & support | 2013 |
| Trondheimsveien 49 AS | Real estate | 2022 |
| Trowi Invest AS | Wholesale & retail | 2005 |
| True Investment AS | Real estate | 2005 |
| Trøa AS | Real estate | 2013 |
| Trøndelag Elektro AS | Construction | 1997 |
| Trøndelag Gass AS | Wholesale & retail | 2001 |
| Trøndelag Gjenvinning AS | Water & waste | 2003 |
| Trøndelag Hunde- Og Hesterehabilitering AS | Other services | 2024 |
| Trøndelag Malerservice AS | Construction | 2024 |
| Trøndelag Vikarservice AS | Transport & logistics | 2016 |
| Trønder-Bygg AS | Construction | 2020 |
| Trønderhouse Publications Ans | Professional & scientific | 2012 |
| Trøndermøbler AS | Wholesale & retail | 2017 |
| Trøndersk Landbruk AS | Administrative & support | 2001 |
| Tta AS | Information & communication | 2014 |
| Tuda Handel AS | Other services | 2003 |
| TURBUSS1 AS | Transport & logistics | 2009 |
| Tussilago Barnehage Stjørdal AS | Education | 2022 |
| Tverås Eiendom AS | Real estate | 1998 |
| Tverås Holding AS | Construction | 2021 |
| Tverås Maskin & Transport AS | Construction | 1990 |
| Tvik Holding AS | | 2025 |
| TWD Utleie AS | Administrative & support | 2021 |
| Tybring Holding AS | | 2021 |
| Transportsentralen Stjørdal A/S | Transport & logistics | 1988 |
| Tømmermester Erling Skjelstad & Sønn AS | Construction | 1979 |
| Tømmerøy Eiendom AS | Real estate | 2015 |
| Tønsåsen N2 AS | Real estate | 2013 |
| U9T Invest AS | Construction | 2021 |
| Uaf Prosjektutvikling AS | Real estate | 2025 |
| Umas Stjørdal AS | Administrative & support | 2021 |
| Undervannsdrone AS | | 1999 |
| Unilift AS | Wholesale & retail | 2016 |
| Unique Dame Og Herrefrisør AS | Other services | 1996 |
| Uppertown AS | Arts & recreation | 2020 |
| Urmaker Bjerve Stjørdal AS | Wholesale & retail | 2009 |
| Valle Kul Media AS | Arts & recreation | 2025 |
| Vanderås Invest AS | | 2024 |
| Vanja Kristoffersen | Other services | 2013 |
| Varnes Invest Limited Nuf | Financial services | 2007 |
| Varnes.Biz Limited Nuf | Professional & scientific | 2007 |
| Ved Og Maskin Tjenester AS | Manufacturing | 2021 |
| Vedul Shooting AS | Professional & scientific | 2023 |
| Veien Hjem Trondheim AS | Manufacturing | 2013 |
| Veilagene Vikåsvegen SA | Real estate | 2018 |
| Veiskille Eiendom AS | Real estate | 2019 |
| Velah AS | Financial services | 2005 |
| Vennatrø Byutvikling AS | Real estate | 2019 |
| Vennatrø Eiendom AS | Real estate | 1990 |
| Vennatrø Eiendomsdrift AS | Real estate | 1998 |
| Vennatrø Gruppen AS | Real estate | 2008 |
| Vennatrø Invest AS | Real estate | 2014 |
| Vennatrø Næringsbygg AS | Real estate | 1995 |
| Vennatrø Næringspark AS | Real estate | 2013 |
| Vennatrø Næringsutvikling AS | Real estate | 1991 |
| Vennatrø Sutterø AS | Real estate | 1988 |
| Vennatrø Øst AS | Real estate | 2016 |
| Verksted E14 AS | Other services | 2025 |
| Verkstedplassen AS | Other services | 2005 |
| Veterinær Kåre B Sunde AS | Professional & scientific | 2026 |
| Victoria-Holding AS | | 2026 |
| Vidar Grav AS | Transport & logistics | 2000 |
| Vifstadlia AS | Real estate | 2017 |
| Viggja Næring AS | Real estate | 2013 |
| Vikanlandet AS | Real estate | 2023 |
| Vikans Blomster AS | Wholesale & retail | 2012 |
| Vikans Gartneri AS | Wholesale & retail | 2005 |
| Vikans Gartneri Eiendom AS | Real estate | 1987 |
| Vikans Holding AS | Wholesale & retail | 2005 |
| Vikans Produksjon AS | Agriculture & fishing | 1986 |
| Vikaune Eiendom AS | Real estate | 2025 |
| Vikaune Fabrikker AS | Manufacturing | 1989 |
| Vikaune Holding AS | Real estate | 2016 |
| Vikaune Invest AS | Real estate | 1972 |