| Sanoi Søndre AS | Hospitality | 2022 |
| Santa Maria Pizza Restaurant & Bar Da | Hospitality | 2005 |
| Santa Monica Holding AS | | 2024 |
| Santiago De Santa Fe AS | Other services | 2025 |
| Santoro Holding AS | | 2020 |
| Santro AS | | 2015 |
| Sanuk AS | Real estate | 2005 |
| Saperi 2 AS | Hospitality | 2024 |
| Saperi AS | Hospitality | 2023 |
| Saperi Holding AS | Hospitality | 2023 |
| Sara Consult AS | Real estate | 1987 |
| Sara Quale AS | Information & communication | 2024 |
| Saro Robotics AS | Professional & scientific | 2025 |
| Saros Konsult AS | Professional & scientific | 2018 |
| Sarpsborg Logistikkbygg AS | Real estate | 2016 |
| Sascon AS | Professional & scientific | 2012 |
| Satcon AS | Information & communication | 2017 |
| Satheo Holding AS | | 2016 |
| Sati AS | Financial services | 2013 |
| Satore AS | Real estate | 2024 |
| Saty | Professional & scientific | 2021 |
| Saupstad Senter Utvikling AS | Real estate | 2020 |
| Sav Konsult AS | Professional & scientific | 2022 |
| Saveas AS | Real estate | 2011 |
| Savo AS | Financial services | 2016 |
| Saxenborg Barnehage SA | Education | 2006 |
| Saxenborg Eiendom AS | Real estate | 2022 |
| Saxenborg Holding AS | Real estate | 2017 |
| Sazava AS | Financial services | 2005 |
| SBG 7 AS | Real estate | 1962 |
| Sbno AS | Hospitality | 2018 |
| SBR AS | Information & communication | 2018 |
| Scale Aquaculture Rental AS | Administrative & support | 2014 |
| Scale Up AS | Professional & scientific | 2019 |
| Scanbio Marine Group AS | Manufacturing | 2011 |
| Scanbio Marine Group Holding AS | Manufacturing | 2022 |
| Scanbygg AS | Construction | 2019 |
| Scandinavia Dent AS | Health & social care | 2022 |
| Scandinavian Beauty Trondheim AS | Other services | 2022 |
| Scarcity AS | Real estate | 2021 |
| Scenekanten AS | Hospitality | 2017 |
| Scent AS | Wholesale & retail | 2011 |
| Schei Holding AS | Real estate | 2005 |
| Schei Invest AS | Real estate | 2000 |
| Schistad Reitås AS | | 2024 |
| Schjetne Holding AS | | 2022 |
| Schjetne Invest AS | Financial services | 2017 |
| Schjetne Transport AS | Transport & logistics | 1998 |
| Schjølberg Holding AS | Professional & scientific | 2012 |
| Schlanders Finans AS | Financial services | 2005 |
| Schløsser-Møller Gruppen AS | Real estate | 2016 |
| Schmell Da | Information & communication | 2022 |
| Schrimpf Engineering AS | Professional & scientific | 2017 |
| Schrøder Fysioterapi AS | Health & social care | 2019 |
| Schtau AS | | 2025 |
| Sci AS | Professional & scientific | 2009 |
| Sci-Fi Food AS | Professional & scientific | 2017 |
| Science Communication Accelerator AS | Professional & scientific | 2021 |
| Scientas AS | | 2025 |
| Scon Holding AS | | 2021 |
| Scoped Solutions AS | Information & communication | 2024 |
| Scorpion AS | Health & social care | 2000 |
| Scoutdi AS | Professional & scientific | 2017 |
| Scrapbooking 4 Us Da | Wholesale & retail | 2005 |
| Scroccone Invest AS | | 2018 |
| Sd-Bolig AS | Real estate | 2012 |
| SDS Eiendom AS | Real estate | 2004 |
| Sea Server AS | Professional & scientific | 2015 |
| Sea Train Company AS | Transport & logistics | 2024 |
| Seac Brannsikring AS | Construction | 2012 |
| Seafood Consulting AS | Real estate | 1994 |
| Seafood Investment AS | Administrative & support | 2022 |
| Sealand Bemanning Og Logistikk AS | Transport & logistics | 2023 |
| Sealfe Invest AS | | 2024 |
| Seamaster Food AS | Professional & scientific | 2019 |
| Search House AS | Professional & scientific | 2012 |
| Searis AS | Professional & scientific | 2012 |
| Seavion AS | Information & communication | 2024 |
| Seaweed Solutions AS | Agriculture & fishing | 2009 |
| Sebastian Rydning AS | Real estate | 2007 |
| Sebo Sport AS | Wholesale & retail | 2018 |
| Sec Utvikling AS | Real estate | 2022 |
| Second Chances AS | Wholesale & retail | 2026 |
| Second Opinions AS | Health & social care | 2023 |
| Sectioned Holding AS | Real estate | 2026 |
| Secure Identity Holding AS | Financial services | 2007 |
| Secure Practice AS | Information & communication | 2017 |
| Secureit AS | | 2019 |
| Sedicon AS | Wholesale & retail | 2001 |
| Sefo Forvaltning AS | Real estate | 2023 |
| Seh Holding AS | Administrative & support | 2019 |
| Seh Nor Holding AS | | 2022 |
| Seidr AS | | 2020 |
| Seifra AS | Real estate | 2020 |
| Seit Kapital AS | | 2023 |
| Seize IT AS | Information & communication | 2013 |
| Selbekk Investment AS | Agriculture & fishing | 2017 |
| Selbekk Tekniske AS | Construction | 2019 |
| Selberg Arkitekter AS | Professional & scientific | 2019 |
| Selberg Arkitektur AS | Professional & scientific | 2019 |