| Salemsveien AS | Real estate | 2011 |
| Salespartner Nor AS | Administrative & support | 2018 |
| Salgshjelp.No AS | Wholesale & retail | 2018 |
| Salgspartneren AS | Administrative & support | 2019 |
| Salim Mortazavi AS | Wholesale & retail | 2021 |
| Salmos AS | | 2005 |
| Salno Invest AS | | 2021 |
| Salong 83 AS | Other services | 2014 |
| Salong Moni Ans | Other services | 1993 |
| Salongen Te L1 Å Dei AS | Other services | 2020 |
| Salongpartner AS | Wholesale & retail | 2015 |
| Salus Service AS | Construction | 2022 |
| Salvesen Blikk Eiendom AS | Real estate | 2018 |
| Salvesen Blikk Og Ventilasjon AS | Construction | 2021 |
| Salvesen Bygg & Innredning AS | Construction | 2021 |
| Salvesen Holding AS | Construction | 2018 |
| Sam Sing Ans | Hospitality | 1984 |
| Sama Frisør AS | Other services | 2019 |
| Samarium AS | Financial services | 2016 |
| Samflyt AS | Information & communication | 2018 |
| Samfundets Skole Dvergsnes AS | Education | 2004 |
| Samfundets Skole Sentrum AS | Education | 2004 |
| Samodra AS | | 2012 |
| Samtech Sør AS | Wholesale & retail | 2011 |
| Samtid AS | Education | 2022 |
| San Sebastian AS | Hospitality | 2019 |
| Sana Mottaksdrift 2 AS | Health & social care | 2023 |
| Sana Mottaksdrift AS | Health & social care | 2020 |
| Sana Utvikling AS | Health & social care | 1998 |
| Sana Velverd AS | Health & social care | 1996 |
| Sand Ventures AS | | 2024 |
| Sandblåsing & Lakkering AS | Other services | 2007 |
| Sanden Media AS | Information & communication | 2006 |
| Sanden Studio AS | Arts & recreation | 2014 |
| Sandens Medisinske Senter AS | Health & social care | 2012 |
| Sandens PHT AS | Health & social care | 2015 |
| Sandvand-Invest AS | Hospitality | 2017 |
| Sandvikmoenservice AS | Construction | 2026 |
| Sangbert AS | Hospitality | 2008 |
| Sangvik Service Eiendom AS | Real estate | 2011 |
| Sangvikveien 64 AS | Real estate | 1989 |
| Sanita Invest AS | Real estate | 2001 |
| Sanitas AS | Health & social care | 2023 |
| Sans & Smak AS | Wholesale & retail | 2015 |
| Sanse Invest AS | Financial services | 2018 |
| Sap Holding AS | Other services | 2021 |
| Sapo Eiendom AS | Real estate | 2013 |
| Sardan Holding AS | | 2021 |
| Saseb AS | Professional & scientific | 2007 |
| Sat Consult AS | Professional & scientific | 2003 |
| Satoe Invest AS | Financial services | 2007 |
| Satsehuset AS | Information & communication | 2026 |
| Sattam Consulting AS | Professional & scientific | 2022 |
| Saturn Da | Professional & scientific | 2003 |
| Saveen & Werner AS | Wholesale & retail | 1994 |
| Savino AS | Financial services | 2005 |
| Sawa Eiendom AS | Real estate | 2021 |
| Saxon Solutions AS | Construction | 2025 |
| SBG Magnus Barfotsvei 9 C AS | Health & social care | 2008 |
| Sbire Studio Ans | Wholesale & retail | 2025 |
| SBK Invest AS | Real estate | 2021 |
| SBS Forever AS | Real estate | 2005 |
| SBT AS | Real estate | 2005 |
| Scalenord AS | Professional & scientific | 2026 |
| Scan Lamps Vta AS | Health & social care | 2017 |
| Scan Solutions AS | Professional & scientific | 2024 |
| Scan Vinduer AS | Wholesale & retail | 2017 |
| Scanco Holding AS | Real estate | 2022 |
| Scandinavian Golf Tours AS | Administrative & support | 2026 |
| Scandinavian Web AS | Information & communication | 2015 |
| Scanticon AS | Real estate | 1993 |
| Scanturf AS | Wholesale & retail | 2016 |
| Scanturf Eiendom AS | Real estate | 2018 |
| Scanvik AS | Professional & scientific | 2021 |
| Scenario Invest AS | Professional & scientific | 2014 |
| Sch-Holding AS | | 2024 |
| Schark AS | | 2022 |
| Scheel Holding AS | Health & social care | 2024 |
| Schellhorn AS | Wholesale & retail | 2008 |
| Schibsted Production AS | Information & communication | 2013 |
| Schille Invest AS | Real estate | 2021 |
| Schimjolie AS | Professional & scientific | 2013 |
| Schjøtt Invest AS | Real estate | 2006 |
| Schultz Hansen Holding AS | | 2022 |
| Score Invest AS | Financial services | 2018 |
| Screen Publishing AS | Professional & scientific | 2016 |
| Scuderia AS | Manufacturing | 2014 |
| SE Andersen Invest AS | Real estate | 2011 |
| SE De AS | Professional & scientific | 2018 |
| SEA1 Ahts Pool AS | Transport & logistics | 2010 |
| SEA1 Marine Crew AS | Mining & quarrying | 2024 |
| SEA1 Offshore AS | Mining & quarrying | 2006 |
| SEA1 Offshore Crew AS | Mining & quarrying | 2006 |
| SEA1 Offshore Inc. | Transport & logistics | 2008 |
| SEA1 Offshore Invest AS | Mining & quarrying | 2006 |
| SEA1 Offshore Maritime Personnel AS | Mining & quarrying | 2009 |
| SEA1 Offshore Oscv AS | Mining & quarrying | 2022 |
| SEA1 Offshore Rederi AS | Mining & quarrying | 1854 |
| SEA1 Offshore Us Holding AS | Transport & logistics | 2014 |
| Seabed Separation AS | Professional & scientific | 2013 |