| Strandholmen Eiendomsutvikling AS | Real estate | 2022 |
| Strandholmen Invest AS | Administrative & support | 2005 |
| Strandvegen 12 Eiendom AS | Real estate | 2019 |
| Styrk Regnskap AS | Professional & scientific | 2024 |
| Superkingholding AS | | 2021 |
| Survika Gård Da | Arts & recreation | 2022 |
| Svendsen Pizza AS | Hospitality | 2016 |
| Sverres Gate 25 AS | Real estate | 2025 |
| Sverresgate 11-13 AS | Real estate | 2022 |
| Sverresgate 11-13 Holding AS | Real estate | 2023 |
| Sverresgate 23 AS | Real estate | 2013 |
| Sverresgate 7 AS | Real estate | 2019 |
| Symi AS | Information & communication | 2023 |
| Sør-Inge Invest AS | Real estate | 2015 |
| Søren R Thornæs V. 11 AS | Real estate | 2025 |
| Søren R Thornæs Veg 10 AS | Real estate | 2018 |
| T&F Holding AS | | 2021 |
| T&H Skjelbred AS | | 2025 |
| T&Tw Holding AS | Professional & scientific | 2022 |
| T. Rasmussen Invest AS | Real estate | 2019 |
| T.Johansen & Sønner AS | Wholesale & retail | 2012 |
| Tabasco AS | Real estate | 1975 |
| Takk Berre Bra AS | Professional & scientific | 1997 |
| Taktekkerbrødrene Hustad AS | Construction | 2020 |
| Tangen Holding AS | | 2022 |
| Tannlege Aleksander Øie AS | Health & social care | 2023 |
| Tannlege Angelus AS | Health & social care | 2012 |
| Tannlege Eidar Strøm AS | Health & social care | 2016 |
| Tannlege Hagen AS | Health & social care | 2019 |
| Tannlege Joakim Lund Breistrand AS | Health & social care | 2013 |
| Tannlege Lyder Malm AS | Health & social care | 2005 |
| Tannlege Nordskag AS | Health & social care | 2026 |
| Tannlege Ola Øie AS | Health & social care | 2019 |
| Tannlegene Øie AS | Health & social care | 2022 |
| Tannpleier Lise I Pedersen AS | Health & social care | 2018 |
| Taro Scallops Ans | | 1992 |
| TC Prosjekt AS | Real estate | 2022 |
| TCR Eiendomsutvikling AS | Real estate | 2023 |
| Telba Invest AS | Real estate | 2023 |
| Teleconsult Eiendom AS | Wholesale & retail | 2003 |
| Teleconsult Holding AS | Wholesale & retail | 1996 |
| Telekiosken Namsos AS | Wholesale & retail | 2004 |
| Terje Grubbmo AS | Professional & scientific | 2013 |
| Tessus Invest AS | | 2021 |
| Theis Huldt-Nystrøm AS | Health & social care | 1999 |
| Thomas Brøndbo AS | Arts & recreation | 2004 |
| Thomas Wright and Sons (Norway) AS | Real estate | 2007 |
| Thorsen Maskin Og Fjellteknikk AS | Construction | 2017 |
| Tiendeholmen Eiendom AS | Real estate | 2007 |
| Tilje Invest AS | Construction | 2021 |
| Tino's AS | Hospitality | 1996 |
| Tino's Hotell Og Restaurant AS | Hospitality | 2007 |
| Tip Top Hårsenter AS | Other services | 2021 |
| Tjernes Invest AS | | 2020 |
| TKG Invest AS | | 2020 |
| Toddum Gårdsysteri AS | Manufacturing | 2022 |
| Torgersen AS | Real estate | 1975 |
| Tosi Eiendom AS | Real estate | 1999 |
| Total Bygg&Tjenester AS | Construction | 2025 |
| Treecon AS | Manufacturing | 2001 |
| Trekanten Trafikkskole AS | Education | 2013 |
| Trekanten Trafikkskole Rørvik AS | Education | 2021 |
| Trio Media AS | Professional & scientific | 1987 |
| Trio Media Invest AS | Real estate | 2005 |
| Træn AS | Arts & recreation | 2000 |
| Trønder-Plan Eiendom AS | Professional & scientific | 2005 |
| Trønder-Plan Holding AS | Professional & scientific | 2005 |
| Trønderlyd AS | Arts & recreation | 2007 |
| Trønderplan AS | Professional & scientific | 1988 |
| TS Hustad Holding AS | Financial services | 2022 |
| Tyr AS | Professional & scientific | 2007 |
| Tøffe Poter AS | Wholesale & retail | 2018 |
| Ullvaren Eiendom AS | Real estate | 1998 |
| Ullvaren Kafe AS | Hospitality | 2014 |
| Urmaker Bjerve AS | Wholesale & retail | 1998 |
| Utleietjenester AS | Administrative & support | 2015 |
| Vanos AS | | 2026 |
| Vassli Holding AS | Real estate | 2015 |
| Vedfjellet AS | Real estate | 2012 |
| Veiviser'N BHT AS | Health & social care | 2010 |
| Veko Holding AS | Wholesale & retail | 2009 |
| Vemuinvest AS | Professional & scientific | 2018 |
| Vemundvik Brygge AS | Transport & logistics | 2022 |
| Vemundvik Invest AS | Real estate | 2025 |
| Vemundvik Snekkerfabrikk AS | Manufacturing | 1976 |
| Vemundvik Termoglass AS | Manufacturing | 1987 |
| Verftsgata 11 AS | Real estate | 2018 |
| Verftsgata 12 AS | Real estate | 2003 |
| Verftsgata 16-18 AS | Professional & scientific | 2016 |
| Verftsgata 20 AS | Real estate | 2017 |
| Verftsgata 24 AS | Real estate | 2021 |
| Verftsgata 26 AS | Real estate | 2013 |
| Verftsgata 28 AS | Real estate | 2013 |
| Verftsgata 30 AS | Real estate | 2015 |
| Verftsgata 32 AS | Real estate | 2025 |
| Verftsgata 40 AS | Real estate | 2018 |
| Verftsgata 44 AS | Real estate | 2019 |
| Verftsgata 48 Eiendom AS | Real estate | 2017 |
| Verftsgata 6 AS | Real estate | 2016 |
| Verftsgata 7 AS | Real estate | 2010 |