| Sei Holding AS | Real estate | 2005 |
| Sei Podlen AS | Real estate | 2006 |
| Sei Åsane AS | Real estate | 2006 |
| Seidel Noche Invest AS | | 2023 |
| Seksjonspartner AS | Real estate | 2008 |
| Sele Optikk AS | Wholesale & retail | 1989 |
| Selvbetjent AS | Wholesale & retail | 2023 |
| Senator Holding AS | Construction | 2011 |
| Senator Prosjekt AS | Real estate | 2009 |
| Seniorsenteret AS | Real estate | 2020 |
| Sentrum Utvikling AS | Construction | 2013 |
| Sentrum Vekst AS | Real estate | 2005 |
| Sentrumsutvikling Stord AS | Real estate | 1992 |
| Serverbite AS | Information & communication | 2009 |
| Shaa Invest AS | | 2019 |
| Shadi Eshmawi AS | Transport & logistics | 2025 |
| Shiny Metal AS | Real estate | 2019 |
| Sibek Rorbuer AS | Real estate | 2023 |
| Sigma Consult AS | Professional & scientific | 1990 |
| Sigmaplus People AS | Professional & scientific | 2006 |
| Silvergroup AS | Professional & scientific | 2019 |
| Silvergroup Holding AS | Manufacturing | 2020 |
| Sioc - Study in Another Country AS | Education | 2008 |
| Sissel Lekven AS | | 2025 |
| Sjukehuskiosken Ans | Wholesale & retail | 1992 |
| Sjøkompetanse AS | Education | 2022 |
| Skaar Hansen Holding AS | Real estate | 2023 |
| Skag Design AS | Professional & scientific | 2025 |
| Skaldalefy AS | | 2023 |
| Skateneset AS | Agriculture & fishing | 2019 |
| Skeidar Stord AS | Wholesale & retail | 1998 |
| Skibenes Invest AS | | 2025 |
| Skjelloppdrett Da | Agriculture & fishing | 1989 |
| Skjersholmane Båthamn AS | Real estate | 2013 |
| Skjærgårdservice AS | Administrative & support | 2019 |
| SKL Vind AS | | 2024 |
| Skogbu Utvikling AS | Real estate | 2023 |
| Skorpo AS | | 2020 |
| Skotabergvegen 1 AS | Real estate | 2024 |
| Skotlio Invest AS | | 2023 |
| Skrivargarden Stord AS | Real estate | 2008 |
| SKS Resources AS | Professional & scientific | 2026 |
| Skulstad Eiendom Invest AS | | 2018 |
| Skulstad Gruppen AS | | 2018 |
| Skulstad Holding AS | Real estate | 2005 |
| Slaget Forlag AS | Information & communication | 2021 |
| SM Automotive AS | Wholesale & retail | 2026 |
| Smart Energy Invest AS | Financial services | 2018 |
| Smil Tannhelsesenter AS | Health & social care | 2016 |
| SN Stålbygg AS | Construction | 2007 |
| Snor Fashion AS | Wholesale & retail | 2014 |
| Software Applications AS | Information & communication | 2017 |
| Software Control AS | Information & communication | 2015 |
| Solarkongen AS | Wholesale & retail | 2022 |
| Solbakken Stord AS | Real estate | 2011 |
| Solsikkene Barnehager AS | Education | 2007 |
| Sommarøyo Investeringslag AS | Financial services | 2023 |
| Sparebankhuset AS | Real estate | 2009 |
| Spesialsalg AS | Wholesale & retail | 2016 |
| Spinae Company AS | Arts & recreation | 2014 |
| Spinnville Hunder AS | Education | 2020 |
| Sponavik Drift AS | Hospitality | 2021 |
| Sport 1 Stord AS | Wholesale & retail | 2006 |
| Sport Og Trening Lillehammer AS | Arts & recreation | 2022 |
| Spratt Holding AS | | 2020 |
| Standard Eiendom Stord AS | Real estate | 2002 |
| Stavanger Investering Selskap AS | Real estate | 2013 |
| Stavland Holding AS | Real estate | 2013 |
| STB Consult AS | Professional & scientific | 1988 |
| Steine Kraft AS | Energy | 2005 |
| Steinfjellet AS | Wholesale & retail | 2019 |
| Steinsbø Eiendomsutvikling AS | Real estate | 2002 |
| Stensletten & Husevik Holding AS | | 2026 |
| Stjerneblokka AS | Real estate | 2012 |
| Stockmann AS | Real estate | 2024 |
| Stockmann Holding AS | Real estate | 2019 |
| Stockmann Invest AS | | 2024 |
| Stokken Holding AS | Real estate | 2020 |
| Stomas AS | Construction | 2002 |
| Stomas Holding AS | Construction | 2014 |
| Stord Agent AS | Administrative & support | 2022 |
| Stord Akuttmedisinsk Undervisning AS | Education | 2008 |
| Stord Anlegg AS | Construction | 2005 |
| Stord Antirust AS | Other services | 2008 |
| Stord Apartments AS | Real estate | 2021 |
| Stord Bil Og Dekksenter AS | Wholesale & retail | 1994 |
| Stord Bilhjelp AS | Transport & logistics | 2008 |
| Stord Bilutleige AS | Administrative & support | 1984 |
| Stord Bolig AS | Real estate | 2024 |
| Stord Boligtaksering AS | Real estate | 2016 |
| Stord Dekkservice AS | Wholesale & retail | 1988 |
| Stord Drosjesentral AS | Transport & logistics | 2024 |
| Stord Dyreklinikk AS | Professional & scientific | 2026 |
| Stord Eiendom AS | Real estate | 2005 |
| Stord Eiendomsforvaltning AS | Real estate | 2020 |
| Stord Eiendomsinvest AS | Real estate | 1988 |
| Stord Engineering Ans | Professional & scientific | 1996 |
| Stord Engineering AS | Professional & scientific | 1997 |
| Stord Folkehøgskule AS | Education | 2018 |
| Stord Foto AS | Wholesale & retail | 2020 |