| Skeidar Raglamyr AS | Wholesale & retail | 2013 |
| Skeisvang Gjestgiveri AS | Hospitality | 1998 |
| Skeisvang Malerservice AS | Construction | 2021 |
| Skillrace AS | Information & communication | 2006 |
| Skipsaksjeselskapet Hardingen AS | Transport & logistics | 1996 |
| Skjelavik Holding AS | | 2012 |
| Skjeljavika Holding AS | Real estate | 2020 |
| Skjoldavegen 113 AS | Real estate | 2024 |
| Skjoldavegen 48 B AS | Real estate | 2011 |
| Skogland Holding AS | Real estate | 2008 |
| Skopelos AS | Hospitality | 2026 |
| Skorild Holding AS | | 2024 |
| Skrattaskjer AS | Real estate | 1996 |
| Skree Holding AS | | 2024 |
| Skude Industri AS | | 2005 |
| Skvulp Nordvegen AS | Education | 2010 |
| Skåleskog, Børseth, Nybru Da | Construction | 1995 |
| Skåre Fus Barnehage AS | Education | 2021 |
| Skåredalen Vest AS | Real estate | 2011 |
| Skåregata 135 AS | Real estate | 2025 |
| Skåregaten 125 AS | Real estate | 2013 |
| Skåregaten 127 Eiendomsselskap AS | Real estate | 1987 |
| Skåregaten 205 AS | Real estate | 2015 |
| Skåregaten Pizza AS | Hospitality | 2004 |
| Skåretreboen AS | | 2020 |
| Sletta Sjømat AS | Agriculture & fishing | 2023 |
| Slimane Og Sardar AS | Hospitality | 2012 |
| Slimane, Hassan Og Sardar Da | Hospitality | 2004 |
| Sltp Invest AS | Professional & scientific | 2005 |
| Slørdahl Byggservice AS | Construction | 2019 |
| Smalamyr Invest AS | Financial services | 2017 |
| Smalg AS | Construction | 2019 |
| Smart Eiendomsutvikling AS | Real estate | 2011 |
| Smart Finance Solutions AS | Professional & scientific | 2021 |
| Smart Flis Haugaland AS | Wholesale & retail | 2004 |
| Smart System AS | Wholesale & retail | 2004 |
| Sme Konsult Nuf | Professional & scientific | 2010 |
| Smedasundet 40 AS | Real estate | 2014 |
| Smedasundet 49 AS | Real estate | 2007 |
| Smedasundet 94 AS | Real estate | 1926 |
| Smedasundet 98 AS | Real estate | 2024 |
| Smedasundet SYTTI7 AS | Real estate | 2022 |
| Smedesundet Eiendom AS | Real estate | 1996 |
| Smedsvig Holding AS | | 2021 |
| Smil Thai Massasje AS | Other services | 2017 |
| Smilg AS | | 2019 |
| SMM AS | Real estate | 2020 |
| SMS Eiendom Og Utleie AS | Real estate | 2014 |
| SMS Investering AS | Financial services | 2008 |
| Små Barnehager Brakahaug AS | Education | 2024 |
| Små Barnehager Karmøy AS | Education | 2011 |
| Små Barnehager Risøy AS | Education | 2011 |
| Små Barnehager Sentrum AS | Education | 2015 |
| Små Barnehager Stallvegen AS | Education | 2024 |
| Småbarnehager Røvær AS | Education | 2017 |
| Smådyrklinikken I Haugesund AS | Professional & scientific | 2012 |
| SN Eiendom AS | Real estate | 2026 |
| Snapp Service Holding AS | Financial services | 2015 |
| Snapp Service Utleie AS | Administrative & support | 2015 |
| Snapp Stamp Ans | Manufacturing | 2000 |
| Snarveien 1A AS | Real estate | 2013 |
| Snarveien 1D AS | Real estate | 2013 |
| Snarveien 1E AS | Real estate | 2013 |
| Snarveien Næringsbygg AS | Real estate | 2008 |
| Snorkel AS | Agriculture & fishing | 2025 |
| Snøhvit Holding AS | Financial services | 2015 |
| Snørteland Holding AS | | 2025 |
| Snørteland Invest AS | Financial services | 2016 |
| Sofira Maritime Innovation AS | Professional & scientific | 2025 |
| Sogn Aqua Solutions AS | Professional & scientific | 2013 |
| Soh Holding AS | Wholesale & retail | 2007 |
| Soho Kaffe AS | Wholesale & retail | 2022 |
| Solares AS | Construction | 2023 |
| Solberg Sko Og Tekstilagenturer AS | Wholesale & retail | 2017 |
| Solenskraft AS | Wholesale & retail | 2017 |
| Solfjell Invest AS | Financial services | 2012 |
| Solid Eiendomsinvest AS | Real estate | 2022 |
| Solid Mesterbygg AS | Construction | 2024 |
| Solida AS | Real estate | 2022 |
| Solidum Est AS | | 2022 |
| Solkroken Eiendomsutvikling AS | Real estate | 2019 |
| Solo Invest AS | Real estate | 2005 |
| Solstrandvegen Tomt AS | Real estate | 2023 |
| Solus Ipse AS | Health & social care | 2022 |
| Solvang Dekk AS | Wholesale & retail | 2025 |
| Solvang Eiendom AS | Real estate | 1988 |
| Solvang Helse Og Utvikling AS | Health & social care | 2012 |
| Solvangen Park AS | Real estate | 2026 |
| Solvangen Senter AS | Real estate | 2026 |
| Solvangvegen 23 AS | Real estate | 2013 |
| Solvest Holding AS | | 2021 |
| Solvest Rådgiving AS | Professional & scientific | 2020 |
| SOM DU VIL Bente Olufsen og Gunnvor Hausken ANS | | 1989 |
| Source Galileo Holding AS | Energy | 2022 |
| Souvernirs and Gifts Haugesund AS | Wholesale & retail | 2020 |
| Sovest Holding AS | | 2026 |
| SP -Skjønnhet Og Velvære AS | Wholesale & retail | 2019 |
| Spannavegen 63 AS | Real estate | 2023 |
| Spannavegen Eiendomsutvikling AS | Hospitality | 2019 |
| Spannavegen Pizza AS | Hospitality | 2026 |