| Solverden AS | Wholesale & retail | 2022 |
| Sotho AS | Wholesale & retail | 2005 |
| Space Mo I Rana AS | Professional & scientific | 2016 |
| Sparebank 1 Helgeland | Financial services | 1977 |
| Spiren Design AS | Professional & scientific | 2018 |
| Sportmo Holding AS | Wholesale & retail | 2019 |
| SRG AS | Financial services | 2005 |
| Stable Growth AS | Information & communication | 2024 |
| Stal AS | Real estate | 2019 |
| Stanghelle AS | Professional & scientific | 2017 |
| Startup-X AS | Information & communication | 2023 |
| Stasjonskvartalet Mo AS | Real estate | 2026 |
| Steeltech AS | Manufacturing | 2024 |
| Steinar Hanssen Transport AS | Transport & logistics | 1997 |
| Steinar Isaksen AS | Real estate | 2013 |
| Steinar Skåren Holding AS | Financial services | 2011 |
| Steinbekken Bygg Og Eiendom AS | Real estate | 2014 |
| Steinslett Holding AS | | 2020 |
| Stenbekken Invest AS | | 2023 |
| Stener Holding AS | Financial services | 2015 |
| Stenneset Kantine Og Riggdrift AS | Hospitality | 2024 |
| Stetind Invest AS | Real estate | 2010 |
| Stigerplatået AS | Real estate | 1997 |
| Stigmo Eiendom AS | Real estate | 2014 |
| Stik Eiendom AS | Real estate | 1998 |
| Stine Finanger AS | Wholesale & retail | 2023 |
| Stoltz Styling AS | Other services | 2023 |
| Stonehill Invest AS | | 2025 |
| Storeng Bygg AS | Construction | 1997 |
| Stovni AS | Administrative & support | 2024 |
| Strand Shipping AS | Transport & logistics | 2020 |
| Strand Shipping Holding AS | Transport & logistics | 2021 |
| Strand Shipping Invest AS | Transport & logistics | 2000 |
| Strand Tverbakk Holding AS | | 2024 |
| Strandaveien AS | Real estate | 2011 |
| Strandgata Utvikling AS | Real estate | 2010 |
| Stratekq AS | Professional & scientific | 2026 |
| Straumsnes Utvikling AS | Real estate | 2014 |
| STS Eiendom AS | Real estate | 2005 |
| Stødi Byggconsult AS | Professional & scientific | 2018 |
| Støre AS | Financial services | 2008 |
| Subkultur AS | Administrative & support | 2021 |
| Sulacare AS | Professional & scientific | 2021 |
| Sulland Mo AS | Other services | 1975 |
| Summ AS | Hospitality | 2010 |
| Sundterapi AS | Health & social care | 2016 |
| Suveren Helse AS | Health & social care | 2022 |
| Svabo Industrinett AS | Energy | 2018 |
| Svartflog Holding AS | | 2024 |
| Svein Erik Utland Snekkerservice AS | Construction | 1998 |
| Svein Grotnes AS | Real estate | 1979 |
| Svein Åeng Transport AS | Transport & logistics | 1997 |
| Svenskveien 201 AS | Real estate | 2013 |
| Syndikatet AS | | 2025 |
| Syndikatet Holding AS | Health & social care | 2022 |
| Stakobygget AS | Real estate | 1982 |
| Søderlundmyra 40 AS | Real estate | 2021 |
| Søderlundmyra Eiendom AS | Real estate | 2009 |
| Sølvklumpen Holding AS | Financial services | 2005 |
| Søndre Eiendom AS | Real estate | 2001 |
| Søndre Gate 11 Mo AS | Construction | 2021 |
| Sørfjell Invest AS | | 2026 |
| Sørlandsveien 26 28 AS | Real estate | 2014 |
| Sørsjona Havnelag SA | Arts & recreation | 1990 |
| Søstrene Renhold AS | Administrative & support | 2018 |
| T.A Engø Holding AS | | 2021 |
| T.A.S. Holding AS | Manufacturing | 2018 |
| T.H. Maskin AS | Construction | 2012 |
| T.Killi Holding AS | Construction | 2019 |
| T.O. Holding AS | | 2021 |
| T.T Kran Og Industrielt Vedlikehold AS | Wholesale & retail | 2013 |
| T.T. Vedlikehold AS | Wholesale & retail | 2023 |
| T1 Energy Giga Arctic AS | Information & communication | 2020 |
| T1 Energy Norway AS | Manufacturing | 2022 |
| T1 Energy Norway Holding AS | | 2022 |
| Ta Solli Eiendom AS | Real estate | 2011 |
| Taba AS | Real estate | 2022 |
| TAKST1 Helgeland AS | Real estate | 2017 |
| Takstteknikk AS | Real estate | 1995 |
| Taktema AS | Construction | 2023 |
| Tanaris AS | Professional & scientific | 2026 |
| Tangen Uteanlegg AS | Administrative & support | 2019 |
| Tanja's Holding AS | Hospitality | 2020 |
| Tanja's Kjøkken AS | Hospitality | 2017 |
| Tannlege Colin Eriksen AS | Health & social care | 2024 |
| Tannlege Daniel Nowzari AS | Health & social care | 2021 |
| Tannlege Frøysa AS | Health & social care | 2021 |
| Tannlege MSK AS | Health & social care | 2021 |
| Tannlege Nilsen Holding AS | | 2025 |
| Tannlege Storvolleng AS | Health & social care | 2023 |
| Tannlege TB Nilsen AS | Health & social care | 2026 |
| Tannlege Trym Paulsen AS | Health & social care | 2025 |
| Tannpleier Nora Salamonsen AS | Health & social care | 2024 |
| Tante Trines Såpekokeri AS | Wholesale & retail | 2026 |
| Taxitomta I AS | Real estate | 2013 |
| Taxitomta II AS | Real estate | 2013 |
| TB & FD Ans | Construction | 2025 |
| Td-Metoden AS | Education | 2019 |
| Tdi Marketing AS | Professional & scientific | 2019 |
| Techlab AS | Education | 2022 |