| Telekiosken Steinkjer AS | Wholesale & retail | 2004 |
| Tensio TN AS | Energy | 2005 |
| Tevx AS | Health & social care | 2005 |
| TH Utbygging AS | | 2026 |
| Thai Tham AS | Manufacturing | 2018 |
| Thai-Thai Steinkjer AS | Hospitality | 2007 |
| Thane Holding AS | | 2019 |
| Tidligfasefondet II AS | Financial services | 2023 |
| Tiger Frontier AS | Real estate | 2022 |
| Timo Invest AS | Wholesale & retail | 2014 |
| Tingvold Eiendom AS | Real estate | 2015 |
| Tingvold Park Hotel AS | Hospitality | 2002 |
| TM Partner AS | Wholesale & retail | 2008 |
| TNC Norge AS | Information & communication | 2026 |
| Tolu Invest AS | Financial services | 2005 |
| Tom Larsen AS | Information & communication | 1996 |
| Tomo Eiendom AS | Real estate | 2021 |
| Tomo Invest & Consulting AS | | 2022 |
| Tonje Bergin Invest AS | | 2024 |
| Tophold AS | | 2023 |
| Torget Holding AS | | 2026 |
| Torstein Moen AS | Agriculture & fishing | 2012 |
| Torvdal Invest AS | Real estate | 2010 |
| Totaltakst Trøndelag AS | Professional & scientific | 2016 |
| Trafikksenteret - Gule Biler AS | Education | 1994 |
| Tranamarka Eiendom AS | Real estate | 2008 |
| Tranamarka Energipark AS | Professional & scientific | 2002 |
| Transportpilot AS | Information & communication | 2023 |
| Travellinvest Ans | | 1998 |
| Triv AS | Health & social care | 2002 |
| Triv Eiendom AS | Real estate | 2017 |
| Triv Kompetanse AS | Health & social care | 2017 |
| Trivgruppen AS | Real estate | 1953 |
| Trivli AS | | 2024 |
| Tromsø Vind AS | Energy | 1997 |
| Trond Guin Invest AS | Wholesale & retail | 2016 |
| Trondheimsfjorden Våtmarkssenter AS | Professional & scientific | 2012 |
| Trøndelag Bilhjelp AS | Transport & logistics | 2002 |
| Trøndelag Industriservice AS | Manufacturing | 2021 |
| Trøndelag Lyd Og Lys AS | Administrative & support | 2017 |
| Trøndelag Motor AS | Wholesale & retail | 2011 |
| Trøndelag Omsorgssenter AS | Health & social care | 2015 |
| Trøndelag Storkjøkkensenter AS | Wholesale & retail | 1987 |
| Trøndelag Utleieservice AS | Administrative & support | 2020 |
| Trøndelagmat SA | Wholesale & retail | 2011 |
| Trønder-Avisa AS | Information & communication | 1990 |
| Trønder-Distribusjon AS | Transport & logistics | 2003 |
| Trønderservice AS | Construction | 2015 |
| Trønderservice Kulde & Varmeteknikk AS | Construction | 2023 |
| TT Forsikring Og Finans Steinkjer AS | | 2022 |
| Tump Ans | Information & communication | 2001 |
| Tunk AS | Financial services | 2011 |
| Tverråa Kraft AS | Energy | 2008 |
| Tyr Frisør AS | Other services | 2024 |
| Tømmermannsgata 2 AS | Real estate | 1993 |
| Tømmermannsgata 4 AS | Real estate | 2023 |
| Tømmermannsgata 5 AS | Real estate | 2025 |
| Tømmermannsgata Eiendom AS | Construction | 2007 |
| Ulvin Invest AS | | 2026 |
| Unknown Crew AS | Wholesale & retail | 2019 |
| Urmaker Bjerve Steinkjer AS | Wholesale & retail | 2002 |
| Utheim Consulting & Trading AS | Professional & scientific | 2021 |
| Vannebo Invest AS | | 2024 |
| Varcon Norway Da | Wholesale & retail | 2003 |
| Vei-Teknikk AS | Wholesale & retail | 1990 |
| Veien Til Kunnskap AS | Health & social care | 2023 |
| Veleta AS | Real estate | 2006 |
| Ventilasjon Og Inneklima AS | Construction | 2021 |
| Ventilasjonsspesialisten AS | Administrative & support | 2024 |
| Veripolis AS | Information & communication | 2015 |
| Verksvegen 1 AS | Real estate | 2014 |
| Verksvegen 3 AS | Real estate | 1999 |
| Verksvegen 8 AS | Real estate | 2019 |
| Verksvegen Eiendom AS | Real estate | 2011 |
| Veskemagasinet AS | Real estate | 2024 |
| Vester Invest AS | | 2015 |
| Vestheim Utleie AS | Construction | 2025 |
| Vi Service AS | Construction | 2023 |
| Vi-Gruppen AS | Construction | 2019 |
| Vibe Næringspark AS | Real estate | 2025 |
| Viewstart AS | Information & communication | 2024 |
| Viking Steinkjer Ans | Transport & logistics | 1993 |
| Vikingen Barnehage AS | Education | 2006 |
| Vikran Gårdsbruk Ans | Agriculture & fishing | 2002 |
| Villabuen Eiendom AS | Real estate | 2021 |
| Vilteksperten AS | Manufacturing | 2000 |
| Vintage Reserve SA | Arts & recreation | 2017 |
| Virga Invest AS | Real estate | 2017 |
| Visit Innherred AS | Professional & scientific | 2019 |
| Vive Home AS | Information & communication | 2023 |
| VM Betongbygg AS | Construction | 2022 |
| Vokte Eiendom AS | Real estate | 2007 |
| Vorsteh AS | Professional & scientific | 2026 |
| Vulken Eiendom AS | Real estate | 1956 |
| Vy Ipr AS | Information & communication | 2023 |
| Vålen Samfunnshus SA | Real estate | 1961 |
| Vårt Hjem Steinkjer AS | Hospitality | 2010 |
| Vårtun Blomster AS | Wholesale & retail | 2005 |
| Walter & Bagal AS | Wholesale & retail | 2021 |
| Wassbjer Holding AS | Professional & scientific | 2020 |