| Sang Og Spill AS | Arts & recreation | 2024 |
| Sangesland Invest AS | Real estate | 2022 |
| Sanne Eiendom 1 AS | Real estate | 2009 |
| Sanne Invest 1 AS | Real estate | 2018 |
| Sanrol Invest AS | Real estate | 2008 |
| SBD Holding AS | | 2023 |
| Sbe Invest AS | Real estate | 2012 |
| Scanmudring AS | Professional & scientific | 2015 |
| Scanmudring Holding AS | Real estate | 2018 |
| Scanmudring International AS | Real estate | 2023 |
| Schanche Invest AS | Professional & scientific | 2011 |
| Scholz AS | Transport & logistics | 2013 |
| Schulze AS | Professional & scientific | 2023 |
| Scrappegarasjen AS | Wholesale & retail | 2014 |
| Scrappegarasjens Eiendom AS | Real estate | 2021 |
| SE Det Media AS | Information & communication | 2022 |
| Self Invest AS | Financial services | 2017 |
| Sentient AS | Transport & logistics | 2019 |
| Servio AS | Construction | 2026 |
| Seven AS | Real estate | 2021 |
| Seyest AS | | 2025 |
| SG Bolig AS | Real estate | 2014 |
| Show Event AS | Arts & recreation | 2024 |
| Sibb AS | Real estate | 2020 |
| Sigpro AS | | 2021 |
| Sikker Invest AS | Real estate | 2007 |
| Simato Holding AS | | 2026 |
| Simen Steinstad Jørgensen AS | Wholesale & retail | 2020 |
| Sinpro AS | Administrative & support | 2014 |
| Siri K S AS | Health & social care | 2022 |
| Sirkulær Helse AS | Health & social care | 2023 |
| Sirkulær Helseklinikk AS | Health & social care | 2020 |
| Sirupsvafler AS | Manufacturing | 2025 |
| Sivas AS | Professional & scientific | 1992 |
| Sivilingeniør Jan Roness AS | Professional & scientific | 1990 |
| Sjograf AS | Professional & scientific | 2003 |
| Sjø-Sport Mandal AS | Transport & logistics | 1998 |
| Sjøkanten Service AS | Administrative & support | 2024 |
| Sjølingstad Elektro AS | Construction | 2019 |
| Sjøsanden Ferietun AS | Hospitality | 1984 |
| Sjøsanden Legesenter AS | Health & social care | 2026 |
| Sjøsanden Legesenter Da | Health & social care | 2003 |
| Sjøsanden Legesenter Eiendom AS | Real estate | 2002 |
| Skagerrak Navigation AS | Transport & logistics | 2014 |
| Skanes Villsaulag SA | Agriculture & fishing | 2017 |
| Skap Kreativ Folkehøyskole AS | Education | 2015 |
| Skarvøyveien Eiendom AS | Real estate | 2024 |
| Skeie Maskindrift AS | Construction | 2014 |
| Skeie Og Strømme AS | Construction | 2013 |
| Skeie Skogsdrift AS | Construction | 2016 |
| Skeiesbakken Eiendom AS | Construction | 2006 |
| Skeiesbakken Holding AS | Construction | 2006 |
| Skinsnes Eiendom AS | Real estate | 1995 |
| Skinsnes Pizza AS | Hospitality | 2007 |
| Skinsnesheia Barnehage AS | Education | 2004 |
| Skjebstad Holding AS | | 2024 |
| Skjebstad Service AS | Administrative & support | 2023 |
| Skjernøy Villsaulag Da | Agriculture & fishing | 2016 |
| Skjærgården AS | Agriculture & fishing | 2015 |
| Skjærgården Kultursenter AS | Information & communication | 2023 |
| Skjærgården Marina AS | Arts & recreation | 2010 |
| Skjærvika Hytteutleie AS | Real estate | 2008 |
| Skogenveien SA | Real estate | 2024 |
| Skogly Investering AS | Real estate | 2019 |
| Skogsøy Fiskeri Og Vikartjenester AS | Agriculture & fishing | 2019 |
| Skogsøyjenta AS | Agriculture & fishing | 2020 |
| Skoie Holding AS | Real estate | 2005 |
| Skrik AS | Other services | 2012 |
| Skrovje AS | | 2015 |
| Skudeholmen AS | Hospitality | 2024 |
| Skudeholmen Holding AS | Real estate | 2024 |
| Skyline-Media AS | Information & communication | 2016 |
| SL Invest AS | Real estate | 2020 |
| SL Property Invest AS | Real estate | 2025 |
| Smil Media AS | Information & communication | 2020 |
| Smooth Ridesharing AS | Professional & scientific | 2018 |
| Sniktitt AS | Professional & scientific | 2025 |
| Snorstein AS | Information & communication | 2023 |
| Solborg Eiendom AS | Real estate | 2005 |
| Solgløtt Bolig AS | Construction | 2018 |
| Solnesgården Da | Real estate | 2006 |
| Solsiden Eiendom Utvikling AS | Real estate | 2014 |
| Solskjerming Sør Da | Wholesale & retail | 1996 |
| Solstua Eiendomsutvikling AS | Real estate | 2015 |
| Solveig Ask Hansen Fysioterapi AS | Health & social care | 2014 |
| Something Else Marketing AS | Professional & scientific | 2018 |
| Sommerkroveien 11 AS | Real estate | 2007 |
| Sommerkroveien 12 AS | Real estate | 2005 |
| Sommerkroveien 5 AS | Real estate | 1987 |
| Sondresen Invest AS | Professional & scientific | 2019 |
| Soteland & Co AS | | 2025 |
| Soteland AS | Construction | 2022 |
| Soteland Holding AS | | 2021 |
| Southerncars AS | Professional & scientific | 2021 |
| Sovi AS | Real estate | 2014 |
| Spadewerks AS | Professional & scientific | 2026 |
| Spangereidkanalen AS | Real estate | 2007 |
| Speedkey AS | Professional & scientific | 2019 |
| Spelen Utvikling AS | Real estate | 2010 |
| Spiggeren Legesenter Da | Health & social care | 2001 |