| SLT Holdings AS | Information & communication | 2018 |
| Sluppen & Partners AS | Professional & scientific | 2014 |
| Sluppen Eiendom AS | Real estate | 2011 |
| Sluppen Infrastruktur AS | Real estate | 2017 |
| Sluppen Parkering AS | Transport & logistics | 2017 |
| Sluppenvegen 1 AS | Real estate | 2023 |
| Sluppenvegen 10 AS | Real estate | 2007 |
| Sluppenvegen 11 Og 13 AS | Real estate | 2016 |
| Sluppenvegen 14 AS | Real estate | 2008 |
| Sluppenvegen 15 AS | Real estate | 2017 |
| Sluppenvegen 21 AS | Real estate | 2014 |
| Sluppenvegen 23 AS | Real estate | 2016 |
| Sluppenvegen 25 AS | Real estate | 2016 |
| Sluppenvegen 3 AS | Real estate | 2007 |
| Sluppenvegen 8 AS | Real estate | 2011 |
| Sluppenvegen 9 AS | Real estate | 2016 |
| SLV9 AS | Arts & recreation | 2026 |
| Slyngstein Invest AS | Financial services | 2018 |
| Slåttedal Turbil AS | Transport & logistics | 2013 |
| SM Altum Capital AS | | 2026 |
| SM Capital AS | | 2024 |
| Smach AS | | 2022 |
| Smak Midtbyen AS | Hospitality | 2023 |
| Smaltinden AS | Real estate | 2020 |
| Smart Bilutleie AS | Administrative & support | 2026 |
| Smart Environment Ans | Information & communication | 2000 |
| Smart Karriere AS | | 2021 |
| Smart Merd Systems AS | Agriculture & fishing | 2026 |
| Smarta AS | Wholesale & retail | 2022 |
| Smartakva AS | Water & waste | 2024 |
| Smartere Utdanning AS | Education | 2016 |
| Smarthelp AS | Information & communication | 2012 |
| Smarthus AS | Real estate | 2022 |
| Smarthut AS | Professional & scientific | 2024 |
| Smartkonsult AS | Information & communication | 2010 |
| Smartlab Da | Information & communication | 2012 |
| Smarttakst AS | Information & communication | 2020 |
| Smartvoltage AS | Information & communication | 2024 |
| SMB Support AS | Professional & scientific | 2018 |
| Smed-John AS | Real estate | 2023 |
| Smedbrua Eiendom AS | Real estate | 2015 |
| Smedparken Boligutleie AS | Real estate | 2022 |
| Smgi AS | Professional & scientific | 2008 |
| Smhansen Holding AS | | 2026 |
| Smidesang & Lyng AS | Professional & scientific | 2014 |
| Smile Pizza & Grill AS | Hospitality | 2011 |
| Smittefri.No AS | Wholesale & retail | 2014 |
| SMN RH 2025 II AS | | 2025 |
| SMN RH 2025 III AS | | 2025 |
| Smog AS | Professional & scientific | 2020 |
| Smooth Booking AS | Information & communication | 2021 |
| SMP Eiendom AS | Real estate | 2024 |
| SMV Invest AS | Real estate | 2016 |
| Smyr Ans | Arts & recreation | 2003 |
| Småhjelpen AS | Other services | 2026 |
| Småvik AS | | 2025 |
| Småvik Holding AS | Real estate | 2021 |
| Smørlia AS | Real estate | 2003 |
| Snackyard Solsiden AS | Hospitality | 2025 |
| Snackzone AS | Wholesale & retail | 2010 |
| Snadder Og Snaskum Eiendom AS | Real estate | 2014 |
| Snarbekken Invest AS | Real estate | 2024 |
| Snarval AS | | 2024 |
| Sne Consulting AS | Professional & scientific | 2012 |
| Sneisen Holding AS | | 2024 |
| Snekker Føll AS | Construction | 2019 |
| Snekker Og Mur AS | Construction | 2024 |
| Snekkerkompaniet AS | Construction | 2003 |
| Snewær AS | Real estate | 2006 |
| Snhø Invest AS | Real estate | 2024 |
| Snilldal Energipark AS | Real estate | 2026 |
| SNL Racing AS | Professional & scientific | 2025 |
| Snodig Design Da | Information & communication | 2022 |
| Snos Solsiden AS | Wholesale & retail | 2026 |
| Snota Information Technology AS | Information & communication | 2002 |
| Snowbie AS | Health & social care | 2021 |
| Snowflake AS | Professional & scientific | 2012 |
| Snowy Invest AS | Financial services | 2013 |
| SNS Holding AS | | 2013 |
| Snurr Bakklandet AS | Manufacturing | 2025 |
| Snurr City Lade AS | Manufacturing | 2021 |
| Snurr Nyhavna AS | Manufacturing | 2023 |
| Snurr Sommergården AS | Manufacturing | 2024 |
| Snurr Teknostallen AS | Manufacturing | 2025 |
| Snurrebarten Grill & Pizza Da | Hospitality | 1999 |
| Snus AS | Professional & scientific | 2006 |
| Snyrtingar AS | Information & communication | 2025 |
| Snøkrasj AS | Financial services | 2018 |
| Soai AS | Wholesale & retail | 2026 |
| Soch Holding AS | Financial services | 2017 |
| Social Minds AS | Information & communication | 2013 |
| Soda Music Ans | Arts & recreation | 1999 |
| Sofell AS | Financial services | 2005 |
| Soft Rock Diet Holding AS | Hospitality | 2022 |
| Softis Holding AS | | 2015 |
| Softstars AS | Information & communication | 2022 |
| Software Craftsman Tor Hovland AS | Information & communication | 2013 |
| Sofus Holding AS | | 2016 |
| Soheila Rahman AS | Health & social care | 2021 |
| Sohs Invest AS | Financial services | 2016 |