| Social Dining AS | Hospitality | 2022 |
| Social Impact Institute AS | Professional & scientific | 2024 |
| Social Impact Lab AS | Education | 2010 |
| Sofica AS | Professional & scientific | 2019 |
| Sofie Investering AS | | 2025 |
| Soft Sertifisering AS | Professional & scientific | 2010 |
| Sog Utvikling AS | Real estate | 2001 |
| Sogn Forsikring AS | Financial services | 2007 |
| Sogn Handelspark Eiendomsinvest AS | Real estate | 2021 |
| Sogndal Eigedom AS | Real estate | 2012 |
| Soia II AS | Mining & quarrying | 2014 |
| Sol Energi AS | Real estate | 2006 |
| Sol Skjold AS | Other services | 2021 |
| Solar E&I A/S | Real estate | 2005 |
| Solasplitten Eiendom AS | Real estate | 2017 |
| Solati AS | Professional & scientific | 1992 |
| Solbakken Panorama AS | Real estate | 2013 |
| Solbeck Eiendom AS | Real estate | 2026 |
| Solbrun Eiendom AS | Real estate | 2021 |
| Solbrun Holding AS | Administrative & support | 2019 |
| Solea AS | Information & communication | 2024 |
| Solea Topco AS | Information & communication | 2024 |
| Solfi AS | Professional & scientific | 2020 |
| Solhaug Utbygging AS | Real estate | 2010 |
| Solheim Byggrådgivning AS | Professional & scientific | 2023 |
| Solheim Designere AS | Professional & scientific | 1998 |
| Solheim Kjøtt AS | Manufacturing | 1971 |
| Solheim Tannlegevakt AS | Health & social care | 2020 |
| Solheimsgaten 14 AS | Real estate | 1940 |
| Solheimsgaten 23 AS | Real estate | 1999 |
| Solheimsgaten 61 AS | Real estate | 2018 |
| Solheimslien 56 AS | Manufacturing | 2012 |
| Solheimsviken Eiendomsutvikling AS | Real estate | 2011 |
| Solheimsviken Servicebakeri AS | Hospitality | 2015 |
| Solholm Services AS | Administrative & support | 2018 |
| Solid Forsikring AS | Professional & scientific | 2007 |
| Solidia AS | Real estate | 2008 |
| Solidum Holding AS | | 2025 |
| Soljo AS | Real estate | 2023 |
| Sollibotn Hytteeierlag AS | Real estate | 2013 |
| SOLLIEN60D Holding AS | | 2022 |
| Sollis AS | Financial services | 2017 |
| Solo Adventures AS | | 2026 |
| Solo Holdco AS | | 2021 |
| Solsiden Førde AS | Real estate | 2019 |
| Solstice Capital AS | Education | 2022 |
| Solstrand Blomster & Interiør AS | Wholesale & retail | 2005 |
| Solstrands Begravelsesbyrå AS | Other services | 1992 |
| Solstrands Eiendom AS | Other services | 1975 |
| Soltveit Consulting AS | | 2023 |
| Solutia Inc. | Wholesale & retail | 2009 |
| Solvang Eiendomsinvest AS | Real estate | 2025 |
| Solveig Solutions AS | Information & communication | 2021 |
| Som-Sambusa AS | Hospitality | 2024 |
| Something About AS | | 2023 |
| Somiga Eiendom AS | Real estate | 2011 |
| Somja Holding AS | Professional & scientific | 2020 |
| Sommersten AS | Information & communication | 2019 |
| Sonat AS | Information & communication | 2017 |
| Sonat Consulting Bergen AS | Information & communication | 2017 |
| Sonat Consulting Trondheim AS | Information & communication | 2024 |
| Sonat Figment AS | Information & communication | 2022 |
| Sonat Manco I AS | Financial services | 2023 |
| Sonat Midco AS | Information & communication | 2023 |
| Sonat Topco AS | Information & communication | 2023 |
| Soneta AS | Real estate | 2018 |
| Song & Play AS | Hospitality | 2024 |
| Sonne Invest AS | | 2023 |
| Sonoklinikken AS | Health & social care | 2012 |
| Sontum Invest AS | | 2024 |
| Sorbet AS | Professional & scientific | 2025 |
| Sorsdal Holding AS | | 2023 |
| Sos Capital AS | | 2002 |
| Sotra Hjertesenter AS | Health & social care | 2020 |
| Sotra Investering AS | Real estate | 2006 |
| Souk AS | Wholesale & retail | 2015 |
| Sound Proof Music AS | Information & communication | 2022 |
| Soundof.Business AS | Information & communication | 2017 |
| Sounds Like Honey AS | Arts & recreation | 2022 |
| Source Invest AS | Financial services | 2014 |
| South Georgia Heritage Trust | Other services | 2005 |
| South Lawn AS | | 2025 |
| Southway Thrills AS | Wholesale & retail | 2022 |
| Sovereignwise AS | Education | 2023 |
| Soya Restaurant AS | Hospitality | 2014 |
| Sp-Invest AS | Financial services | 2021 |
| SP3 Invest AS | | 2026 |
| SPANIA1 AS | Real estate | 2015 |
| Spannavegen 152 AS | Real estate | 2021 |
| Sparealliansen AS | Administrative & support | 2024 |
| Sparebanken Norge | Financial services | 1982 |
| Sparebanken Norge Boligkreditt AS | Financial services | 2008 |
| Sparebankgaten 4 AS | Hospitality | 2024 |
| Sparegrisen Min AS | Financial services | 2005 |
| Sparkesykkel Da | Arts & recreation | 2024 |
| Sparoyal Norge AS | Wholesale & retail | 2024 |
| Speaklab AS | Education | 2011 |
| Spear Invest AS | | 2025 |
| Spectro AS | Real estate | 2005 |
| Spektr AS | Information & communication | 2020 |