| Slogen Consult AS | Information & communication | 2008 |
| Smart AS | Wholesale & retail | 2005 |
| Smedveien 3 AS | Real estate | 2022 |
| Smil Invest AS | Financial services | 2007 |
| Snøscooterservice Fauske AS | Education | 2012 |
| Solloftet Ans | | 1991 |
| Solvik Utmarkslag | Real estate | 1991 |
| Sos Dekkservice 24/7 AS | Other services | 2024 |
| Spire Blomsterhåndverk AS | Wholesale & retail | 2012 |
| SS Motorservice AS | Manufacturing | 2022 |
| SSC AS | Professional & scientific | 2014 |
| Stardiver Holding AS | | 2013 |
| Stasjonsdrift Leier AS | Wholesale & retail | 2020 |
| Stasjonsdrift Rørmark AS | Wholesale & retail | 2025 |
| Stein AS | Real estate | 1989 |
| Stian Røkenes Christensen AS | Manufacturing | 2023 |
| Storgaten 87 AS | Real estate | 2025 |
| Storyline Nor AS | Information & communication | 2010 |
| Stram AS | Energy | 2014 |
| Strømsnes Entreprenør AS | Construction | 2026 |
| Sulisgarasjen AS | Real estate | 2017 |
| Suliskongen AS | | 2021 |
| Sulitjelma Holding AS | Real estate | 2013 |
| Sulitjelma Industripark AS | Real estate | 2021 |
| Superb Design AS | Professional & scientific | 2011 |
| Sysselkroken AS | Manufacturing | 2023 |
| Sørdahl Invest AS | Financial services | 2012 |
| T L Eiendom Invest AS | Real estate | 2019 |
| T L Fjellsprengning AS | Construction | 2019 |
| Takstingeniør Alvestad AS | Real estate | 2023 |
| Takstmann Kenneth Johansen AS | Real estate | 2020 |
| Tande Invest AS | Financial services | 2014 |
| Tannlege a. Zakariassen AS | Health & social care | 2023 |
| Tannlege Hvitveis AS | Health & social care | 2021 |
| Tannlege Katrine Skogen AS | Health & social care | 2017 |
| Tannpleier Ruth-Anne AS | Health & social care | 2021 |
| Tante Ruth AS | Hospitality | 2024 |
| Taste of Thai AS | Hospitality | 2019 |
| Teknisk Etat Da | Arts & recreation | 2024 |
| Teknobingo Fauske AS | Arts & recreation | 2009 |
| Teminvest AS | | 2024 |
| Temo Invest AS | Financial services | 2013 |
| Terradrift AS | Construction | 2025 |
| Thereses Generasjonsselskap AS | | 2021 |
| Thomas Garstad Holding AS | Wholesale & retail | 2024 |
| Tias Eiendom AS | Real estate | 2015 |
| Tilkobla AS | Information & communication | 2025 |
| TK Maskiner AS | Construction | 2020 |
| TKR Invest AS | Real estate | 2020 |
| TM Invest AS | Real estate | 1991 |
| TNL Holding AS | Construction | 2023 |
| Tobiassen Holding AS | Real estate | 2007 |
| Tohs AS | | 2007 |
| Tor Haugen AS | Administrative & support | 2024 |
| Tor Paulsen & Sønner AS | Real estate | 1979 |
| Torget House AS | Hospitality | 2026 |
| Torggt. 23 AS | Real estate | 2018 |
| Trafikk Og Utvikling AS | Professional & scientific | 2008 |
| Transportindustri AS | Manufacturing | 1977 |
| Transportkompetanse AS | Education | 2000 |
| Trinity AS | | 2023 |
| Trond Eriksen Transport AS | Transport & logistics | 2011 |
| Tørresvik Eggpakkeri AS | Agriculture & fishing | 2003 |
| Tørresvik Gård Da | Real estate | 1979 |
| Uni-Form AS | Professional & scientific | 2010 |
| Vakinn AS | Energy | 2018 |
| Vardegruppen Holding AS | Real estate | 2010 |
| Vargåsen Steinbrudd AS | Mining & quarrying | 2021 |
| Vasskog Holding AS | | 2026 |
| Vedal Maling Og Bad AS | Construction | 2025 |
| Vegard Enterprises AS | | 2023 |
| Veterinærsenteret Fauske AS | Professional & scientific | 2007 |
| Veto Eiendom AS | Administrative & support | 2025 |
| Veto Energi AS | Construction | 2024 |
| Vi Bygg Og Eiendom AS | Real estate | 2020 |
| Vinter AS | Wholesale & retail | 2023 |
| Vinv AS | | 2022 |
| Viphuset Ans | Professional & scientific | 2013 |
| Visual Ideas Solutions AS | Professional & scientific | 2019 |
| Voxx AS | Professional & scientific | 2020 |
| VS Tech AS | Information & communication | 2026 |
| Wenberg AS | | 2025 |
| Wenberg Eiendom AS | Real estate | 2022 |
| Wenberg Fiskeoppdrett AS | Agriculture & fishing | 1985 |
| Wenberg Holding AS | Real estate | 2005 |
| Wenberg Invest AS | Wholesale & retail | 2005 |
| Wenberg-Olsen Holding AS | Real estate | 2025 |
| Wessel Vision AS | Real estate | 2022 |
| Yttervik Holding AS | Construction | 2015 |
| Åge Løkås & Sønner AS | Construction | 1997 |
| Åseng Fellesbeite | Agriculture & fishing | 1996 |
| Økonomihuset Fauske AS | Professional & scientific | 1994 |
| Øyvind Jensen Termotransport AS | Transport & logistics | 1994 |