| Sollid Invest AS | | 2021 |
| Solmed AS | Health & social care | 2026 |
| Solo Kapital AS | | 2026 |
| Solodden Hodl AS | | 2021 |
| Solon Sørvest AS | Real estate | 1986 |
| Solon Sørvest Boligutvikling AS | Real estate | 2008 |
| Solonelle AS | Wholesale & retail | 2025 |
| Soloppgangen AS | | 2025 |
| Solskog AS | Financial services | 2018 |
| Solsta Invest AS | Professional & scientific | 1998 |
| Solthun AS | Real estate | 2007 |
| Soludyne AS | Information & communication | 1997 |
| Soluna AS | Financial services | 2007 |
| Solus AS | | 2020 |
| Solutio Holding AS | Administrative & support | 2016 |
| Solvang ASA | Transport & logistics | 1936 |
| Solvang Gas Carriers AS | Transport & logistics | 2024 |
| Solvang Maritime AS | Transport & logistics | 2007 |
| Solveig Landa AS | Arts & recreation | 2012 |
| Solvendt AS | Professional & scientific | 2005 |
| Sometier AS | Information & communication | 2015 |
| Somme AS | Wholesale & retail | 2023 |
| Sommerfeldt Holding AS | Construction | 2022 |
| Sommerfugl Events Ans | Administrative & support | 2024 |
| Sommerschild Eiendom AS | | 2018 |
| Sondres Båt & Motorservice AS | Manufacturing | 2023 |
| Sonear AS | Professional & scientific | 2026 |
| Sonear Holding AS | | 2026 |
| Sonex AS | Information & communication | 2019 |
| Songa Offshore Rig 2 AS | Mining & quarrying | 2014 |
| Songa Offshore Rig 3 AS | Mining & quarrying | 2014 |
| Sooriya AS | Administrative & support | 2024 |
| Sophies Verden AS | Financial services | 2005 |
| Sopihop AS | Administrative & support | 2017 |
| Sopplement AS | Wholesale & retail | 2024 |
| Sorela Invest AS | | 2023 |
| Sorgenfri Kapital AS | | 2021 |
| Sors AS | | 2021 |
| Sorted Tokens AS | Information & communication | 2026 |
| Sosolo AS | Arts & recreation | 2016 |
| Sosolo Collective AS | Arts & recreation | 2010 |
| Sound of Healing AS | Other services | 2024 |
| Soundops AS | Information & communication | 2025 |
| Soundrops AS | Information & communication | 2014 |
| South East Asia Technology AS | Professional & scientific | 2013 |
| South House AS | | 2023 |
| Southern Cross AS | Professional & scientific | 1995 |
| Southvest AS | Real estate | 2005 |
| Southwestwines AS | Wholesale & retail | 2020 |
| Spac AS | Information & communication | 2021 |
| Space Exploration Lab AS | Professional & scientific | 2025 |
| Spakong AS | Education | 2018 |
| Spande AS | Professional & scientific | 2021 |
| Spannavegen 56 AS | Real estate | 2026 |
| Sparebank 1 Boligkreditt AS | Financial services | 2005 |
| Sparebank 1 Kundesenter AS | Financial services | 2012 |
| Sparebank 1 Næringskreditt AS | Financial services | 2009 |
| Sparebank 1 Sør-Norge ASA | Financial services | 1976 |
| Sparebank 1 Sør-Norge Forretningspartner AS | Professional & scientific | 2007 |
| Sparkles by Teigen AS | Arts & recreation | 2026 |
| Special Energy Services AS | Professional & scientific | 2022 |
| Speciallæge Jørgen Johansen Aps | Health & social care | 2009 |
| Spectatio Invest AS | Financial services | 2005 |
| Spector AS | Real estate | 2013 |
| Speedcast Norway AS | Information & communication | 2000 |
| Spesialistpraksis Davor Baros AS | Health & social care | 2014 |
| Spesialklinikken Limited Nuf | Health & social care | 2010 |
| Spesmedico AS | Health & social care | 2016 |
| Spesmedico Invest Limited Nuf | Professional & scientific | 2010 |
| Spetz Investment AS | | 2019 |
| SPH Ventures AS | | 2026 |
| Sphera AS | Real estate | 2015 |
| Spike Distribution AS | Wholesale & retail | 2004 |
| Spinaker AS | Professional & scientific | 1993 |
| Spire Ultralyd AS | Health & social care | 2024 |
| Spire Utvikling AS | Real estate | 2011 |
| Spirit Energy Norway AS | Mining & quarrying | 2017 |
| Spirit Norway Holding AS | Mining & quarrying | 2006 |
| Spiselighage AS | Wholesale & retail | 2022 |
| Spisoh AS | Hospitality | 2021 |
| Splendit AS | Information & communication | 2012 |
| Splitten AS | Real estate | 2011 |
| Spora Gruppen AS | Professional & scientific | 2022 |
| Sporafjell Utviklingsselskap AS | Real estate | 2012 |
| Sporastøyl Holding AS | Professional & scientific | 2021 |
| Sporhaug AS | Agriculture & fishing | 2021 |
| Sportsteknologi AS | Professional & scientific | 2005 |
| Sportsway Invest AS | | 2021 |
| Spreke Føtter AS | Health & social care | 2017 |
| Spring Chemicals AS | Water & waste | 2020 |
| Springroll AS | | 2025 |
| Spross Consult Da | Professional & scientific | 1996 |
| SPS Investments AS | | 2023 |
| Spødet Butikkdrift AS | Wholesale & retail | 2016 |
| SR Kompetanse Da | Education | 2017 |
| SR Pe-Feeder I AS | Financial services | 2023 |
| SR Pe-Feeder II AS | Financial services | 2023 |
| SR Pe-Feeder III AS | Financial services | 2023 |
| SR Pe-Feeder IV AS | Financial services | 2014 |
| SR Storkjøkken AS | Wholesale & retail | 2009 |