| Skogan Da | Transport & logistics | 1992 |
| Skogan Gård Equestrian AS | Education | 2010 |
| Skogridderveien AS | Real estate | 2013 |
| Skogtroll Trefelling AS | Agriculture & fishing | 2018 |
| Skoli Catering AS | Hospitality | 2025 |
| Skolmar 17 Eiendom AS | Other services | 2017 |
| Skolmar 21 AS | Real estate | 2006 |
| Skolmar 24 AS | Real estate | 2013 |
| Skolmar 26 AS | Real estate | 2020 |
| Skolmar 29 AS | Real estate | 2015 |
| Skolmar 31 AS | Real estate | 1994 |
| Skolmar 32 AS | Wholesale & retail | 2014 |
| Skolmar 35 Da | Real estate | 2003 |
| Skolmar 38 AS | Real estate | 2017 |
| Skolmar Bil AS | Other services | 2009 |
| Skolmar Holding AS | Real estate | 2023 |
| Skolmar Næringsbygg AS | Real estate | 1996 |
| Skolmar Utvikling AS | Real estate | 1985 |
| Skolmar Vaskeribygg AS | Real estate | 2019 |
| Skonkjø AS | Professional & scientific | 2026 |
| Skps Eiendom AS | Real estate | 2025 |
| Skravestad AS | Real estate | 2005 |
| Skrenten Bolig AS | Construction | 2023 |
| Skutestein AS | Information & communication | 2022 |
| Skytec AS | Manufacturing | 1996 |
| Skåren Gård Da | Agriculture & fishing | 2025 |
| Skåren Invest AS | Manufacturing | 2013 |
| Skårenveien 25 AS | Manufacturing | 2013 |
| Skåtviken AS | Real estate | 2007 |
| SL Tech AS | Professional & scientific | 2020 |
| Slagen Elektro & Automasjon AS | Construction | 2008 |
| Slagen Elektro AS | Construction | 2007 |
| Slagenveien 57 AS | Real estate | 2016 |
| Slettedal Refsdal Sjøblom Ans | Wholesale & retail | 1997 |
| Slettedal Takst Og Eiendom AS | Professional & scientific | 2015 |
| Slottsgulv AS | Manufacturing | 2006 |
| Smak & Behag Ans | Administrative & support | 1982 |
| Smakstudio AS | Hospitality | 2010 |
| Sman Invest AS | Real estate | 2013 |
| Smart Investment AS | Professional & scientific | 2013 |
| Smart Living Norway AS | Real estate | 2006 |
| Smart Tak AS | Construction | 2022 |
| Smart Vekst AS | Professional & scientific | 2016 |
| Smartprodukt AS | Wholesale & retail | 2016 |
| Smartrepair Solutions AS | Other services | 2022 |
| Smartstart Ans | Information & communication | 1998 |
| SMB Corporate AS | Professional & scientific | 2004 |
| Smedsrud Drift AS | Real estate | 2005 |
| Smedsrud Eiendom AS | Wholesale & retail | 2006 |
| Smedtunet AS | Manufacturing | 2013 |
| Smep Holding AS | | 2023 |
| Smi Norge AS | Professional & scientific | 2007 |
| Smilhuset AS | Health & social care | 2026 |
| Smilhusetag AS | | 2026 |
| Smith Vangen Holding AS | | 2022 |
| SML AS | Professional & scientific | 2005 |
| Sml-Holding AS | | 2026 |
| Smtm AS | Other services | 2017 |
| Små Og Store Landskap AS | Construction | 2014 |
| Småbyggern Da | Construction | 1998 |
| Småfolk Ans | | 1989 |
| SN Inter AS | Professional & scientific | 2004 |
| Snekker Og Montasjeservice AS | Construction | 2014 |
| Snorre Consulting AS | Health & social care | 2016 |
| Snotra AS | Financial services | 2005 |
| Snuti AS | Information & communication | 2017 |
| So Fitness AS | Education | 2016 |
| Sobol Bygg AS | Construction | 2019 |
| Social Link AS | Professional & scientific | 2026 |
| Sofia AS | Other services | 2004 |
| Sogn Holding AS | Financial services | 2005 |
| Soilzero AS | Professional & scientific | 2021 |
| Sol Maskin AS | Construction | 2024 |
| Solant AS | Wholesale & retail | 2018 |
| Solbakken Melby Enterprise Da | Wholesale & retail | 2018 |
| Solbakkeveien 8 AS | Real estate | 2021 |
| Solberg Gård AS | Agriculture & fishing | 2019 |
| Solberg Næringspark AS | Real estate | 1996 |
| Sole Barnehage SA | Education | 1992 |
| Solerma AS | Financial services | 2008 |
| Solgangsbris AS | Financial services | 2010 |
| Solheim Trafikkskole AS | Education | 2020 |
| Soliloqui AS | Financial services | 2008 |
| Solkollen Eiendom AS | Real estate | 2023 |
| Solli Anlegg Og Service AS | Construction | 2026 |
| Solløkka Invest AS | | 2019 |
| Solløkka Utvikling AS | Real estate | 2009 |
| Soltur Nuf | Real estate | 2006 |
| Solvang Barnehage SA | Education | 1988 |
| Solvang Legesenter Da | Health & social care | 2001 |
| Solvårs Blomsterglede AS | Arts & recreation | 2016 |
| Soma Live Da | Arts & recreation | 2017 |
| Somathe AS | | 2025 |
| Somilla AS | Real estate | 2018 |
| Sommerfjord Invest AS | Real estate | 2023 |
| Sommerro Eiendom AS | Real estate | 2001 |
| Sommervold AS | Professional & scientific | 2010 |
| Sophies Accessories AS | Wholesale & retail | 2021 |
| Sor-Tec AS | Manufacturing | 2006 |
| Sor-Tec Holding AS | | 2025 |