| Sommerkroveien 6B AS | Real estate | 1965 |
| Songdalsvegen 70 AS | Real estate | 2025 |
| Songvaar Invest AS | Real estate | 2006 |
| Sonitro AS | Information & communication | 2025 |
| Sonja Hauan AS | Education | 2019 |
| Sonmar Solutions AS | Professional & scientific | 2014 |
| Sonovo AS | Information & communication | 2011 |
| Soolo AS | Professional & scientific | 2019 |
| Soolo SPV AS | | 2025 |
| Sooo. Creativ Communication AS | Professional & scientific | 2017 |
| Sor Holding AS | | 2025 |
| Sor Interim AS | Wholesale & retail | 2025 |
| Sorbwater Technology AS | Professional & scientific | 2007 |
| Sortland Invest AS | Wholesale & retail | 2023 |
| Soscap AS | | 2024 |
| Southsafe AS | Professional & scientific | 2012 |
| SP Equestrian AS | Agriculture & fishing | 2024 |
| Sp&E Consulting AS | Professional & scientific | 2009 |
| SPAR10 AS | Professional & scientific | 2019 |
| Sparfly AS | | 2022 |
| Sparkly AS | Administrative & support | 2023 |
| Spectra Geophysical AS | Professional & scientific | 2018 |
| Spectrum Blue AS | Professional & scientific | 2022 |
| Spectrum Eiendom Vågsgt 15 AS | Real estate | 1989 |
| Spero Holding AS | Wholesale & retail | 2021 |
| Spesialgrossisten Matfylket AS | Wholesale & retail | 1985 |
| Spind Eiendom AS | Real estate | 2013 |
| Spinnaker Energi AS | Professional & scientific | 2025 |
| Spir Helse AS | Health & social care | 2015 |
| Spire Consulting AS | Professional & scientific | 2024 |
| Spirit of Norway AS | Wholesale & retail | 2016 |
| Spor Kapital AS | | 2025 |
| Sporio AS | Information & communication | 2021 |
| Sport & Fritid Da | Wholesale & retail | 1999 |
| Sport & Rekreasjon AS | Wholesale & retail | 1998 |
| Sportmed AS | Health & social care | 2020 |
| Sportsfiskeren Ans | Manufacturing | 1995 |
| Sprek Norge AS | Administrative & support | 2014 |
| Sprengkraft AS | Construction | 2023 |
| Sprettert AS | Professional & scientific | 2020 |
| Spring Bygg AS | Construction | 2012 |
| Spro Eiendom AS | Real estate | 2021 |
| Spro Holding AS | Health & social care | 2021 |
| Spud AS | Professional & scientific | 2025 |
| SR Entreprenør Holding AS | Construction | 2021 |
| SR- Eiendom AS | Real estate | 2004 |
| Sr-Entreprenør AS | Construction | 2017 |
| Srkh Transport AS | | 2023 |
| SSH II AS | | 2019 |
| SSK Service AS | Professional & scientific | 2021 |
| ST Innovasjon AS | Information & communication | 2012 |
| St-Finans AS | | 2017 |
| Staale Lie AS | Manufacturing | 2010 |
| Stacap AS | Wholesale & retail | 1995 |
| Stakkeland Invest AS | Real estate | 2006 |
| Stampe Sjø AS | Agriculture & fishing | 2026 |
| Stampen Capital AS | | 2026 |
| Standin AS | Administrative & support | 2013 |
| Stangeland Apotek AS | Wholesale & retail | 2017 |
| Stangeland Eiendomselskap AS | Real estate | 2022 |
| Stangeland Pizza AS | Hospitality | 2008 |
| Stanger AS | Wholesale & retail | 2016 |
| Stanley Eiendom AS | Real estate | 1993 |
| Starlet AS | | 2025 |
| Stavanger Aftenband Da | Arts & recreation | 2022 |
| Stavanger Bygg AS | Professional & scientific | 2016 |
| Stavanger Båtsenter AS | Wholesale & retail | 2020 |
| Stavanger Eiendom AS | Real estate | 2001 |
| Stavanger Fraktterminal AS | Real estate | 2000 |
| Stavanger Havnelager SHL Holding AS | | 1994 |
| Stavanger Industribelegg AS | Construction | 2001 |
| Stavanger Kickoff AS | Administrative & support | 2012 |
| Stavanger Kjøkkensenter AS | Wholesale & retail | 2019 |
| Stavanger Klima AS | Construction | 2003 |
| Stavanger Klima Holding AS | Construction | 2024 |
| Stavanger Kran AS | Transport & logistics | 2011 |
| Stavanger Kulde AS | Wholesale & retail | 2010 |
| Stavanger Næringsbygg AS | Real estate | 2008 |
| Stavanger Skin AS | Other services | 2022 |
| Stavanger Turbuss AS | Transport & logistics | 2023 |
| Stavangerkameratene AS | Arts & recreation | 2017 |
| Stavangerveien 16 AS | Real estate | 2017 |
| Stavangerveien Eiendom AS | Real estate | 2012 |
| Stavenes & Co AS | | 2021 |
| Stefan Invest AS | Professional & scientific | 2013 |
| Stefanie Herm & Team AS | Wholesale & retail | 2016 |
| Stein Hegre Holding 2 AS | | 2024 |
| Stein Å Sånt Da | Wholesale & retail | 2003 |
| Steinar Skjervik Holding AS | Arts & recreation | 2016 |
| Steinar Skjervik Investering AS | Arts & recreation | 2016 |
| Steinfeld Sportsmanagement AS | Administrative & support | 2018 |
| Steinskog Holding AS | | 2024 |
| Steinslandhuset AS | Real estate | 2025 |
| Steinsæter Holding AS | | 2020 |
| Stellaire AS | Professional & scientific | 2023 |
| Stellaire Holding AS | Information & communication | 2025 |
| Stellar Consultants AS | Administrative & support | 2024 |
| Stenders Drift AS | Wholesale & retail | 2012 |
| Stenders Norway AS | Wholesale & retail | 2012 |
| Stene Eiendom AS | Real estate | 1980 |