| Sebaglen Holding AS | Information & communication | 2022 |
| Seeberg Stenersen Holding AS | Information & communication | 2020 |
| Sefi AS | | 2021 |
| Seiv 28 AS | Real estate | 2019 |
| Sense of Style AS | Wholesale & retail | 2020 |
| Sentral Bil AS | Wholesale & retail | 2013 |
| Sentrum Frisør Ski AS | Other services | 2014 |
| Sentrumsgården Eiendom AS | Real estate | 1988 |
| Sentrumskvartalet Askim AS | Real estate | 2000 |
| Seol AS | Wholesale & retail | 2020 |
| Separtech AS | Professional & scientific | 2002 |
| Septech Norway AS | Professional & scientific | 1997 |
| Sesol AS | Construction | 2023 |
| Sexolog Dolonen AS | Education | 2023 |
| SGB Invest AS | Real estate | 2006 |
| SHB Group AS | | 2022 |
| Sherwani Gull Og Sølv AS | Manufacturing | 2025 |
| Shinobi AS | Real estate | 2019 |
| Sia Nordic Well Nuf | Wholesale & retail | 2024 |
| Sia Visjon AS | Information & communication | 2026 |
| Sicero AS | Information & communication | 2026 |
| Sierakowski AS | | 2026 |
| Sigvalley SA | Administrative & support | 2025 |
| Silence International Da | Manufacturing | 1997 |
| Siri Aandal AS | Information & communication | 2025 |
| Sirkelbue AS | | 2017 |
| Sjøskogen Eiendom AS | Real estate | 2017 |
| SK Elektro AS | Construction | 2016 |
| SK Graveservice AS | Construction | 2018 |
| Skadsheim Holding AS | | 2025 |
| Skechers Retail Norge AS | Wholesale & retail | 2016 |
| Skeidar Ski AS | Wholesale & retail | 1995 |
| Ski Akvarium AS | Wholesale & retail | 2014 |
| Ski Alliansehall AS | Real estate | 2004 |
| Ski Anleggsservice AS | Construction | 2012 |
| Ski Auto AS | Other services | 1998 |
| Ski Auto Care AS | Other services | 2010 |
| Ski Betongboring AS | Construction | 2007 |
| Ski Bil Og Lakk AS | Other services | 1999 |
| Ski Blomsterforretning AS | Wholesale & retail | 1990 |
| Ski Brudesalong AS | Wholesale & retail | 2013 |
| Ski Eiendom AS | Real estate | 2003 |
| Ski Eiendomsforvaltning AS | Real estate | 2015 |
| Ski Eiendomsmegling AS | Real estate | 2017 |
| Ski Elektriske AS | Professional & scientific | 1987 |
| Ski Follo Taxidrift AS | Transport & logistics | 2001 |
| Ski Fotterapi AS | Health & social care | 2019 |
| Ski Frisør AS | Other services | 2008 |
| Ski Fysioterapi for Barn Og Unge AS | Health & social care | 2009 |
| Ski Fysioterapisenter AS | Health & social care | 2025 |
| Ski Gamle Hotell AS | Real estate | 1975 |
| Ski Golfsimulator AS | Administrative & support | 2021 |
| Ski Hallen AS | Real estate | 2020 |
| Ski Hallen Events AS | Administrative & support | 2023 |
| Ski Handel AS | Wholesale & retail | 2011 |
| Ski Interiør AS | Wholesale & retail | 2013 |
| Ski Invest 2 AS | Real estate | 2013 |
| Ski Karosseri & Autoservice AS | Other services | 1998 |
| Ski Kjøkkendesign AS | Wholesale & retail | 2016 |
| Ski Konsulentbyrå AS | Professional & scientific | 1965 |
| Ski Malerservice AS | Construction | 2020 |
| Ski Mobilreparasjon AS | Other services | 2019 |
| Ski Optiske AS | Wholesale & retail | 1970 |
| Ski Osteopati Da | Health & social care | 2006 |
| Ski Pizza AS | Hospitality | 2015 |
| Ski Radio & TV Service Lars Erik Finholt Og Øyvind Utby Ans | Other services | 1990 |
| Ski Renseri AS | Other services | 1987 |
| Ski Revisjon AS | Professional & scientific | 2002 |
| Ski Rørleggerbedrift AS | Construction | 2021 |
| Ski Sentrumsbygg AS | Real estate | 2014 |
| Ski Skin Clinic AS | Other services | 2024 |
| Ski Snø Og Graveservice AS | Administrative & support | 2016 |
| Ski Spesialistsenter AS | Health & social care | 2012 |
| Ski Sport AS | Administrative & support | 1980 |
| Ski Takst & Eiendom AS | Real estate | 2026 |
| Ski Tannlegesenter AS | Health & social care | 2024 |
| Ski Taxi SA | Transport & logistics | 1975 |
| Ski Ur Og Smykker AS | Wholesale & retail | 2003 |
| Ski Urologiske Spesialistsenter AS | Health & social care | 2018 |
| Ski VVS AS | Construction | 1993 |
| Ski Ønh Drift Da | Health & social care | 2016 |
| Skigutta AS | Real estate | 2022 |
| Skihus 2 AS | | 2026 |
| Skihus AS | Real estate | 2016 |
| Skihus Holding AS | | 2026 |
| Skjeltorp Giantmag AS | Professional & scientific | 2015 |
| Skjærsaker Holding AS | | 2024 |
| Sko Og Lær Reparasjon AS | Other services | 2013 |
| Skogtang Holding AS | | 2020 |
| Skogveien Boliglag AS | Households | 1951 |
| Skoleveien 6B AS | Real estate | 2013 |
| Skorhaugåsen AS | Real estate | 2016 |
| Skousen Eiendommer-Norge AS | Real estate | 2015 |
| Skousen GLH AS | Wholesale & retail | 2015 |
| Skyland Ski AS | Arts & recreation | 2024 |
| Skåfonn AS | | 2022 |
| Skåfonn Holding II AS | Wholesale & retail | 2022 |
| SL Biler AS | Wholesale & retail | 2025 |
| Slettmyr Invest AS | | 2017 |
| Slynga 10 AS | Real estate | 2015 |