| Skog Eiendomsmegling AS | Real estate | 2021 |
| Skogen Nord Invest AS | Construction | 2009 |
| Skredlund AS | Agriculture & fishing | 2020 |
| Skreien Spiseri Finnsnes AS | Hospitality | 2024 |
| Skrolsvik Havn AS | Real estate | 2018 |
| Småbarnsforeldrenes Barnehage Lenvik SA | Education | 1992 |
| Solblomsten AS | Wholesale & retail | 2000 |
| Solinvest AS | Real estate | 1986 |
| Solnes Fiskebåt Holding AS | Agriculture & fishing | 2005 |
| Solnes Kystfiske AS | Agriculture & fishing | 2020 |
| Spesialgrossisten Senja AS | Wholesale & retail | 1986 |
| Spira Takst AS | Professional & scientific | 2016 |
| SPORT1 Finnsnes AS | Wholesale & retail | 1981 |
| Steinhuggeriet AS | Manufacturing | 2006 |
| Stella Fangst 1 AS | Agriculture & fishing | 2014 |
| Stella Fangst 2 AS | Agriculture & fishing | 2014 |
| Stella Polaris AS | Manufacturing | 1968 |
| Stifjell Event Da | Administrative & support | 2019 |
| Stor Stemning AS | Arts & recreation | 2017 |
| Storgata 19 Finnsnes AS | Real estate | 2011 |
| Storgata 21 Finnsnes AS | Real estate | 2011 |
| Storgata 22 Finnsnes AS | Real estate | 2026 |
| Storgata 48A AS | Real estate | 2022 |
| Storgata 51-53 AS | Real estate | 2021 |
| Storås Invest AS | Construction | 2009 |
| Strandveien 16 AS | Real estate | 2004 |
| Strømholt Fysioterapi AS | Health & social care | 2025 |
| Studiesenteret Midt-Troms AS | Education | 2005 |
| Sucabe Invest AS | | 2005 |
| Sun 2 Finnsnes AS | Other services | 2010 |
| Svalken AS | Agriculture & fishing | 2024 |
| Sveiseservice Nord AS | Manufacturing | 2018 |
| Svendsen Rør AS | Construction | 1986 |
| Synssenteret AS | Wholesale & retail | 2010 |
| Sørreisa Elektroinstallasjon AS | Construction | 1996 |
| Søttar's Helsekost AS | Wholesale & retail | 2004 |
| T Karlsen Holding AS | Agriculture & fishing | 2021 |
| Ta Moen Invest AS | | 2026 |
| Taj Holding AS | Real estate | 1995 |
| Takstforum Troms AS | Real estate | 2007 |
| Tannhelse Finnsnes AS | Health & social care | 2014 |
| Tannlegesenteret Senja AS | Health & social care | 2023 |
| Tast Invest AS | Real estate | 2016 |
| TBP AS | Education | 2013 |
| Team Senja AS | Hospitality | 2023 |
| Tej Holding AS | | 2026 |
| Tej Utleie AS | Administrative & support | 2026 |
| Teknisk Bureau Finnsnes AS | Wholesale & retail | 2007 |
| Teknobingo Finnsnes AS | Arts & recreation | 2004 |
| Terapeutisk Friluftsliv AS | Health & social care | 2024 |
| Tere Eiendom AS | Real estate | 1995 |
| Thenik AS | Real estate | 2012 |
| Thermoline Tromsø AS | Transport & logistics | 2017 |
| Tian Eiendom Rødbergodden AS | Real estate | 2015 |
| Tilbygg & Renovering AS | Construction | 2016 |
| Tinta Service AS | Administrative & support | 2018 |
| Tippekiosken Finnsnes AS | Wholesale & retail | 1994 |
| TJ Eiendom AS | Real estate | 2003 |
| TLS Kjøkkenteam AS | Wholesale & retail | 2018 |
| TNB Finnsnes AS | Wholesale & retail | 2005 |
| Tole Eiendom AS | Real estate | 2013 |
| Toms Trafikkskole AS | Education | 2016 |
| Torstensen Bygg-Team AS | Construction | 2015 |
| Tovefjord AS | Agriculture & fishing | 2017 |
| TP Maskin Finnsnes AS | Construction | 2000 |
| Tpi AS | Administrative & support | 2003 |
| Trafikk Og Transport AS | Administrative & support | 2011 |
| Transport Nord Tøllefsen Terminalen AS | Real estate | 2002 |
| Transportsentralen Nord AS | Transport & logistics | 2019 |
| Troms Betongarbeid AS | Construction | 2014 |
| Troms Byggeservice AS | Construction | 2023 |
| Troms Takservice AS | Construction | 1996 |
| Troms Vei Og Skog AS | Agriculture & fishing | 2018 |
| Troms Økonomiservice AS | Professional & scientific | 2017 |
| Tropas AS | Agriculture & fishing | 2009 |
| Trulsen Gruppen AS | Real estate | 2005 |
| Trulssen Bil Og Transport AS | Transport & logistics | 1998 |
| Turnfabrikken AS | Real estate | 2016 |
| Tverrelv Vannverk SA | Water & waste | 1960 |
| Teppesenteret AS | Wholesale & retail | 1986 |
| Uggen Form Da | Arts & recreation | 2024 |
| Ul Invest AS | Real estate | 2024 |
| Ulf Trulsen AS | Transport & logistics | 2024 |
| Valen Brygge AS | Real estate | 2007 |
| Valen Holding AS | Wholesale & retail | 2005 |
| Vangen VVS AS | Construction | 2005 |
| Vargen Reklamebyrå Ans | Professional & scientific | 1996 |
| Verdde Event AS | Administrative & support | 2025 |
| Vestlandshus Tromsø AS | Construction | 2003 |
| Vestnes Berntsen Våpen Ans | Wholesale & retail | 1999 |
| VI2AN AS | Real estate | 2021 |
| Viking VVS AS | Construction | 2025 |
| Visit Senja Region SA | Administrative & support | 2016 |
| Vito Fiskerier AS | Agriculture & fishing | 2021 |
| Vónin Refa AS | Manufacturing | 2003 |
| Vøatec AS | Agriculture & fishing | 2020 |
| Wallerama AS | | 2021 |
| Walters Bilberging AS | Transport & logistics | 2006 |
| Webkilden Da | Information & communication | 2005 |
| Werners Universalservice AS | Agriculture & fishing | 2016 |