| Renø Invest AS | | 2019 |
| Rett Hjem Tromsø SA | Wholesale & retail | 2015 |
| Ridey AS | Wholesale & retail | 2007 |
| Ringjord Elektro AS | Construction | 2020 |
| Rist AS | Manufacturing | 2023 |
| Risvik Vannverk Ba | Water & waste | 1978 |
| RJG Holding AS | Information & communication | 2010 |
| RMB AS | Construction | 2015 |
| Rog AS | Hospitality | 2021 |
| Rolf Einar Johansen AS | Professional & scientific | 2018 |
| Rolf-Tore Albrigtsen AS | Construction | 2007 |
| Rolstad Hagedesign AS | Administrative & support | 2019 |
| Ropnesvegen 49 AS | Real estate | 2022 |
| Ropnesvegen 55 AS | Hospitality | 2026 |
| Ropnesvegen 78 AS | Real estate | 2023 |
| Rta Holdning AS | | 2021 |
| Rødhette 2 AS | Education | 2023 |
| Rødhette AS | Education | 2015 |
| S.A.Maskin. Da | Construction | 2010 |
| Sahco Invest AS | | 2026 |
| Salarøyvegen Vannledning SA | Water & waste | 2017 |
| Salarøyveien Næringspark AS | Real estate | 2013 |
| Sallir AS | Wholesale & retail | 2018 |
| Salt Entreprenør AS | Construction | 2009 |
| Sandneshamn AS | Real estate | 2007 |
| SC Web Services AS | Information & communication | 2019 |
| Scandinavian Houses Nuf | Real estate | 2014 |
| Seinsommer Productions AS | Arts & recreation | 2017 |
| Selsbane Eiendom AS | Real estate | 2018 |
| Senor AS | Agriculture & fishing | 2023 |
| Service Marine AS | Transport & logistics | 2016 |
| Servicesenteret Nord AS | Education | 2003 |
| Shjo Holding AS | Construction | 2020 |
| Signatur Vika AS | Other services | 2020 |
| Siri Holding AS | | 2024 |
| SJS Service AS | Construction | 2024 |
| Sjurelv Fiskeoppdrett AS | Agriculture & fishing | 2018 |
| Sjurelv Fiskeri AS | Professional & scientific | 2018 |
| Sjurelv Holding BFH AS | | 2019 |
| Sjurelv Holding Heh AS | Real estate | 2019 |
| Sjurelv Holding THH AS | Agriculture & fishing | 2019 |
| Sjurelv Rør AS | Construction | 2020 |
| Sjølund Invest AS | Real estate | 2005 |
| Sjøstjerna Familiebarnehage Ans | Education | 2004 |
| Skardalen Settefisk AS | Agriculture & fishing | 2006 |
| Skjerodden AS | Agriculture & fishing | 2016 |
| Skjærgård Holding AS | | 2018 |
| Skogvik Eiendom AS | Real estate | 2025 |
| Skogvik Holding AS | | 2025 |
| Slåttnes Vannverk SA | Water & waste | 1975 |
| SM Service AS | Other services | 2012 |
| Smieberget AS | | 2023 |
| Småslett Og Marislett Vannverk SA | Water & waste | 1968 |
| Snekov AS | Real estate | 2023 |
| Solberg Pettersen AS | Manufacturing | 1987 |
| Solli Bygg AS | Construction | 2026 |
| Sollied Invest AS | | 2025 |
| Solseth Utvikling AS | Professional & scientific | 2015 |
| Sos-Langstrand AS | Education | 2019 |
| Spesiell Eiendom AS | Real estate | 2024 |
| Srgm Tromsø AS | Wholesale & retail | 2024 |
| Stalmar AS | Construction | 2015 |
| Steam AS | Hospitality | 2022 |
| Steam Bygg AS | Construction | 2024 |
| Steam Eiendom AS | Real estate | 2022 |
| Steam Invest AS | Hospitality | 2022 |
| Steam Tours AS | Administrative & support | 2024 |
| Steinly Holding AS | Manufacturing | 2018 |
| Stenersen AS | Wholesale & retail | 1997 |
| Stina SH Holding AS | | 2026 |
| Storelva Idrettspark AS | Arts & recreation | 2002 |
| Strand Apartments AS | Real estate | 2023 |
| Strandheim Utvikling AS | Real estate | 2005 |
| Su Bygg AS | Construction | 2012 |
| Sveise AS | Manufacturing | 2019 |
| T Lindstrøm AS | | 2025 |
| T Olsen Bygg AS | Construction | 2011 |
| T&J Hansen AS | Administrative & support | 2021 |
| T.A.B. AS | Administrative & support | 2005 |
| T.J Eiendom AS | Real estate | 2021 |
| T.J Holding AS | Real estate | 2021 |
| Tama AS | Information & communication | 2014 |
| Tannlege Siri Pettersen AS | Health & social care | 2023 |
| Technical Solutions AS | Professional & scientific | 2019 |
| Teconsulting AS | Professional & scientific | 2015 |
| Then Invest AS | | 2012 |
| Thevik Junior AS | Agriculture & fishing | 2012 |
| THH Holding AS | | 2025 |
| Thode Invest AS | Real estate | 2017 |
| Tholiphia AS | | 2023 |
| Thorbjørnsen Holding AS | | 2026 |
| TK Eiendom Nor AS | Real estate | 2022 |
| Toften Maskin AS | Administrative & support | 2022 |
| Tor Gabrielsen Eiendom AS | Real estate | 1999 |
| Total Prosjektledelse Tromsø AS | Construction | 2014 |
| Traly AS | Agriculture & fishing | 2022 |
| Troms Bygg Og Håndverk AS | Construction | 2024 |
| Troms Caravan Company AS | Administrative & support | 2026 |
| Tromsocompass AS | Transport & logistics | 2025 |
| Tromsø Aero AS | Professional & scientific | 2018 |