| Sandor Invest AS | Real estate | 2020 |
| Sandra Grill AS | Hospitality | 2025 |
| Sandras Grill & Kebab AS | Hospitality | 2024 |
| Sandvold & Velde Supply AS | Wholesale & retail | 1968 |
| Sannes Eiendom AS | Real estate | 1964 |
| Santiago Property I AS | Real estate | 2016 |
| Santiago Property II AS | Real estate | 2016 |
| Sara Invest AS | | 2024 |
| Sareco AS | Professional & scientific | 2006 |
| Saru | Construction | 2006 |
| Sarunto AS | Transport & logistics | 1999 |
| Saunakongen AS | Professional & scientific | 2023 |
| Sausjord Eiendom AS | Real estate | 2005 |
| Sawera AS | Hospitality | 2024 |
| Scandinavian Reach Technologies AS | Information & communication | 2015 |
| Scenekraft AS | Information & communication | 2011 |
| Schille Helsetenester AS | Health & social care | 2013 |
| Schive Takst AS | Real estate | 2020 |
| Schumann Capital Holding AS | | 2025 |
| Schwennicke AS | Financial services | 2012 |
| Schütz Bygg AS | Construction | 2011 |
| Scrappekjelleren A/S | Wholesale & retail | 2008 |
| Sea Bass Capital AS | | 2023 |
| Sea Breeze Electrical Consulting AS | Professional & scientific | 2023 |
| Seaccess AS | Professional & scientific | 2019 |
| Seanca AS | Construction | 2025 |
| Seax AS | Professional & scientific | 2024 |
| See Energy AS | Professional & scientific | 2022 |
| Seglem Eiendom AS | Real estate | 2009 |
| Seglem Holding AS | Transport & logistics | 2003 |
| Segvan Kebab Grill AS | Hospitality | 2018 |
| Seier Holding AS | | 2022 |
| Seime Holding AS | Financial services | 2018 |
| Seljestad Invest AS | | 2023 |
| Selvåg Subsea AS | Professional & scientific | 2016 |
| Sems Invest AS | | 2021 |
| Senab Eikeland Vest AS | Wholesale & retail | 1999 |
| Sentral Bygg AS | Construction | 2021 |
| Sentrum Eiendom AS | Real estate | 2000 |
| Sentrum Invest AS | Real estate | 2001 |
| Sentrum Invest KS | Real estate | 2004 |
| Sentrum Invest Parkering AS | Transport & logistics | 2006 |
| Sentrum Trening Eiendom AS | Real estate | 2021 |
| Sentrum Trening Haugesund AS | Arts & recreation | 2011 |
| Sentrum Vekter AS | Administrative & support | 2020 |
| Sentrum Yoga AS | Education | 2019 |
| Sentrumsnær Utvikling AS | Real estate | 2025 |
| Sera AS | Real estate | 2013 |
| Sevland Bunyan Arkitekter AS | Professional & scientific | 2011 |
| SFR Barnehager AS | Education | 1986 |
| SFR Eiendom AS | Real estate | 2024 |
| SFR Holding AS | Education | 2014 |
| Shady Shades AS | Information & communication | 2017 |
| Shali AS | | 2024 |
| Shannon Invest AS | Transport & logistics | 2011 |
| Shelton AS | Financial services | 2017 |
| Shorly AS | Real estate | 2023 |
| Shorly II AS | Information & communication | 2026 |
| Showup Event AS | Professional & scientific | 2025 |
| Shvest Eiendom AS | Real estate | 2021 |
| Sigma Eiendom AS | Wholesale & retail | 1997 |
| Sigma Jobo AS | Wholesale & retail | 2005 |
| Sigma Motor AS | Wholesale & retail | 2001 |
| Signator AS | Professional & scientific | 2019 |
| Signatur Frisør AS | Other services | 2018 |
| Signe Storesund AS | Health & social care | 2006 |
| Signesdottir Art Production AS | Professional & scientific | 2023 |
| Sigurd Hundsnes Holding AS | | 2025 |
| Sigurd Janus Sørensen | Construction | 1998 |
| Sigurd Sivertsen AS | Health & social care | 2006 |
| Sigurdsen Eiendom AS | Real estate | 2011 |
| Sikra Holding AS | | 2025 |
| Silverfern AS | Professional & scientific | 2024 |
| Simatoma AS | | 2020 |
| Simsea Assets AS | Administrative & support | 2013 |
| Simsea Holding AS | Real estate | 2014 |
| Simsea Real Operations AS | Education | 2017 |
| Sindre.Jh Holding AS | Real estate | 2024 |
| Singer Bernina Sysenter AS | Wholesale & retail | 2011 |
| Sinmar Eiendom AS | Real estate | 2026 |
| Sinmar Holding AS | Wholesale & retail | 2022 |
| Sirin Food AS | Hospitality | 2019 |
| Sirius Naturterapeutisk Skole AS | Education | 2012 |
| Sitrus AS | Financial services | 2014 |
| Sivac Eiendom AS | | 2025 |
| Sixshooter Holding AS | | 2024 |
| Sjursen Holding AS | Financial services | 2011 |
| Sjø Investering AS | Real estate | 2014 |
| Sjøco AS | Transport & logistics | 1997 |
| Sjøhuskleiva 15 AS | Real estate | 2014 |
| Sjøklar AS | Mining & quarrying | 2016 |
| SK Holding Haugesund AS | Hospitality | 2019 |
| Skagen Ans | Transport & logistics | 1990 |
| Skagen Eiendom AS | Real estate | 2002 |
| Skagen Eiendomsdrift Haugesund AS | Administrative & support | 2017 |
| Skagen Sør Eiendom AS | Real estate | 1993 |
| Skalbergvegen 2 AS | Real estate | 2023 |
| Skalda AS | Real estate | 2023 |
| Skattkjær Eiendom AS | Real estate | 2014 |
| Skattkjær Skiferindustri AS | Manufacturing | 1987 |