| Rctic Fish AS | Wholesale & retail | 2023 |
| Reflex Bygg AS | Education | 1994 |
| Reflex Trafikkskole AS | Education | 2011 |
| Regnskap I Troms AS | Professional & scientific | 2017 |
| Revisjon Og Rådgivning AS | Professional & scientific | 2008 |
| RK Maskin & Transport AS | Construction | 2018 |
| RK Mur Og Flis AS | Construction | 2016 |
| Robert Sandby Holding AS | | 2026 |
| Roberts Billakkering AS | Other services | 2026 |
| RTS Eiendom AS | Real estate | 2018 |
| Sagås Bygg AS | Construction | 2023 |
| Sami Shop AS | Wholesale & retail | 2012 |
| Sandbukt AS | Health & social care | 1990 |
| Sandøyrvegen Skogsvegforening | Administrative & support | 1995 |
| Sanner Engineering AS | Professional & scientific | 2023 |
| Scanvision AS | Wholesale & retail | 2024 |
| Selinv AS | | 2016 |
| Setlar Holding AS | Real estate | 2024 |
| SG Trans Tromsø AS | Transport & logistics | 2017 |
| Skjæret Vannanlegg SA | Water & waste | 1986 |
| Sko Dæ AS | Wholesale & retail | 2023 |
| Skogli Butikkdrift AS | Wholesale & retail | 2020 |
| Skogli-As | Hospitality | 2017 |
| Skogli-Holding AS | | 2021 |
| Skogli-Invest AS | | 2021 |
| Sköld AS | Hospitality | 2022 |
| Smile Thai Auto AS | Wholesale & retail | 2018 |
| Steinbakken Skogsvei SA | Real estate | 1985 |
| Storbakk Da | Agriculture & fishing | 2018 |
| Storbukt Gård Da | Agriculture & fishing | 2004 |
| Stormo Maskin & Transport AS | Construction | 2012 |
| Stormoen Holding AS | | 2026 |
| Stormoen Veksthus AS | Agriculture & fishing | 2022 |
| Storsteinnes Kulturhus SA | Real estate | 1967 |
| Storvatn Vassverk SA | Water & waste | 1962 |
| Strupvegan Skogsveglag SA | Real estate | 2012 |
| Strømsli Transport AS | Transport & logistics | 2015 |
| Sørkjos Storbil AS | Manufacturing | 2022 |
| Takvatn Grunneierlag SA | Real estate | 1942 |
| Team Kongsli Da | Administrative & support | 2006 |
| The Steve Cooling Band Da | Arts & recreation | 2000 |
| The True North Experience AS | Administrative & support | 2026 |
| Tord Moen AS | Construction | 1987 |
| Trollskogen Barnehage Storsteinnes SA | Education | 1994 |
| Troms Bioenergi AS | Energy | 2022 |
| Tromsbygg Entreprenør AS | Construction | 2014 |
| Trond Eliassen AS | Administrative & support | 2019 |
| Tømmerelv Eiendom AS | Real estate | 2024 |
| Tømmerelv Vegservice AS | Wholesale & retail | 2008 |
| Veiskifte Eiendom AS | Real estate | 2010 |
| Venke & Brithemors Kjøkken Da | Hospitality | 2003 |
| Vestre Balsfjord Grunneierlag SA | Agriculture & fishing | 1966 |
| W Skaper Trsp History a Mere Limited Nuf | Transport & logistics | 2026 |
| Whale AS | Health & social care | 2008 |
| Woodfield AS | Health & social care | 2024 |
| Ø Karlsen Holding AS | Real estate | 2017 |
| Øvervoll Maskin & Transport AS | Construction | 2025 |