| Simiri Holding AS | | 2025 |
| Simnergy AS | Information & communication | 2019 |
| Simon & Thea Da | Professional & scientific | 1999 |
| Simon H. AS | | 2021 |
| Simon Johansen Holding AS | Real estate | 2026 |
| Simon Møkster Eiendom AS | Real estate | 1995 |
| Simon Møkster Holding AS | Transport & logistics | 2004 |
| Simon Møkster Rederi AS | Transport & logistics | 2004 |
| Simon Møkster Shipping AS | Transport & logistics | 2004 |
| Simon Rage AS | | 2022 |
| Simonsen & Co Eiendom AS | Real estate | 2021 |
| Simply AS | | 2023 |
| Simply Fashion AS | Wholesale & retail | 2018 |
| Simplyfish AS | Professional & scientific | 2017 |
| Sincap AS | Financial services | 2006 |
| Sincera AS | Professional & scientific | 2022 |
| Sine Delta AS | Wholesale & retail | 2021 |
| Singh Holding AS | Hospitality | 2016 |
| Sini Invest AS | | 2018 |
| Sinnes Holding AS | Real estate | 2005 |
| Sinope AS | Real estate | 2019 |
| Sipa Invest AS | | 2025 |
| Sirevaag Invest AS | | 2012 |
| Sirevåg Laks AS | Agriculture & fishing | 2023 |
| Sirinor AS | Professional & scientific | 2021 |
| Sirious:Business Limited Nuf | Education | 2006 |
| Siripynten Utbygging AS | Real estate | 2009 |
| Siriskjær Næring 2 AS | Real estate | 2016 |
| Siriskjær Næring AS | Real estate | 2012 |
| Siriskjær Utbygging AS | Real estate | 2006 |
| Sirius Group AS | Professional & scientific | 2004 |
| Sirius Trading AS | Wholesale & retail | 2025 |
| Sirius XR Holding AS | | 2026 |
| Sirkel IT Bidco AS | | 2024 |
| Sis Coffee&Bakery AS | Hospitality | 2024 |
| Sis Sportssenter AS | Education | 2005 |
| Sissels Invest AS | Real estate | 2007 |
| Site Energi AS | Energy | 2022 |
| Site Holding AS | Real estate | 2015 |
| Site Services AS | Real estate | 2019 |
| Sitid Holding AS | Health & social care | 2019 |
| Sitid Psykologtjenester AS | Health & social care | 2019 |
| Sitoli Invest AS | | 2023 |
| Sits Holding AS | Education | 2012 |
| Siv Ing Magne Nes AS | Administrative & support | 1999 |
| Siv Sunde Consulting AS | Professional & scientific | 2024 |
| Sival Invest AS | | 2021 |
| Sivilarkitekt Mnal Jonny Johansen AS | Professional & scientific | 2007 |
| Sivilarkitekt Rolf Skjelstad AS | Professional & scientific | 2014 |
| Sivilarkitektene Hoem AS | Professional & scientific | 1998 |
| Sivvi Invest AS | | 2020 |
| Sixpence Holding AS | | 2023 |
| SJ Gruppen AS | | 2012 |
| SJ Mam AS | Real estate | 2015 |
| SJF AS | Manufacturing | 2026 |
| Sjova & Sjaven AS | | 2020 |
| Sjulstad Invest AS | | 2026 |
| Sjøglimt Investering AS | Real estate | 2016 |
| Sjøhagen 10 AS | Real estate | 2024 |
| Sjøhagen 3 AS | Real estate | 2003 |
| Sjøhagen 6 AS | Real estate | 2023 |
| Sjøhagen 9 AS | Real estate | 1989 |
| Sjøhagen 9 Stavanger AS | Real estate | 2007 |
| Sjøhagen Andeler AS | Real estate | 2022 |
| Sjøhagen AS | Real estate | 1983 |
| Sjøhagen Eiendom AS | Real estate | 2022 |
| Sjøhuset Verven 42 AS | Real estate | 2011 |
| Sjøluft AS | Financial services | 2012 |
| Sjølvik Va AS | Water & waste | 2016 |
| Sjøtun Invest AS | Real estate | 2017 |
| Sjøveien 3 Holding AS | Financial services | 2015 |
| SK Lek AS | Wholesale & retail | 2020 |
| Skaar Management Consulting AS | Professional & scientific | 2012 |
| Skaara Invest AS | Real estate | 2005 |
| Skadi Contracting AS | Professional & scientific | 2023 |
| Skadi Offshore AS | Professional & scientific | 2026 |
| Skafferen AS | Wholesale & retail | 1999 |
| Skagen 10 AS | Real estate | 2002 |
| Skagen 14 AS | Real estate | 2016 |
| Skagen 15 Eiendom AS | Real estate | 2026 |
| Skagen 22 AS | Real estate | 1935 |
| Skagen 28 - 32 AS | | 2025 |
| Skagen 37 AS | Real estate | 2021 |
| Skagen 40 AS | Real estate | 2001 |
| Skagen 7 AS | Real estate | 2020 |
| Skagen Bageri Ans | Wholesale & retail | 1991 |
| Skagen Fiskerestaurant Stavanger AS | Hospitality | 2024 |
| Skagen Hotellbygg AS | Real estate | 2015 |
| Skagen Kapital AS | | 1997 |
| Skagen Maling AS | Construction | 2017 |
| Skagen Nevropsykologisk Klinikk AS | Health & social care | 2012 |
| Skagen Operations AS | Administrative & support | 2024 |
| Skagen Ship Consulting AS | Transport & logistics | 2013 |
| Skagen Ship Management AS | Transport & logistics | 2020 |
| Skagen Trafikkskole AS | Education | 1995 |
| SKAGEN21 AS | Hospitality | 2024 |
| SKAGEN21 Karaokebar AS | Hospitality | 2025 |
| SKAGEN21 Restaurantdrift AS | Hospitality | 2025 |
| Skagenkaien 14 a AS | Real estate | 1988 |
| Skagenkaien 35-37 AS | Real estate | 2019 |