| Stortorvets Gjestgiveri AS | Hospitality | 1998 |
| Storxion AS | Energy | 2026 |
| Story Surge Films AS | Information & communication | 2023 |
| Straboo AS | Information & communication | 2017 |
| Strai Barnehage SA | Education | 1989 |
| Strai Dagligvare Eiendom AS | Real estate | 2004 |
| Strai Kjøkken AS | Manufacturing | 1992 |
| Strai Kjøkken Butikkdrift AS | Wholesale & retail | 2021 |
| Strai Kjøkken Holding AS | Real estate | 1980 |
| Strai Kjøkken Kristiansand AS | Wholesale & retail | 2008 |
| Straisvann Invest AS | Financial services | 2005 |
| Stral Eiendom AS | Real estate | 2022 |
| Strand Rud Holding AS | Professional & scientific | 2023 |
| Strandpromenaden 31 AS | Real estate | 2019 |
| Strategipartner AS | | 2021 |
| Stratego AS | Information & communication | 2003 |
| Stray & Wåland Advokatdrift AS | Professional & scientific | 2017 |
| Stray Kostøl AS | | 2022 |
| Strays Båthavn Da | Arts & recreation | 2021 |
| Strikkeliv AS | Wholesale & retail | 2016 |
| Strjona Capital AS | Real estate | 2025 |
| Strjona Property AS | Real estate | 2025 |
| Strømduellen SA | Professional & scientific | 2019 |
| Strømme FRK Hangeland AS | Hospitality | 2020 |
| Strømme Invest AS | Real estate | 1965 |
| Strømmes Eiendom AS | Real estate | 2005 |
| STRØMMES24 AS | Wholesale & retail | 1985 |
| Strømsheia Bolig AS | Real estate | 2016 |
| Strømsheia Holding AS | Real estate | 2011 |
| Strømsheia Næringsutvikling AS | Real estate | 2010 |
| Strømsveien 228 AS | Real estate | 2016 |
| Studedalen Deponi AS | Mining & quarrying | 2015 |
| Studedalen Holding AS | Real estate | 2024 |
| Studenten Catering AS | Hospitality | 2007 |
| Studio B88 AS | Wholesale & retail | 2021 |
| Studio in AS | Professional & scientific | 2021 |
| Studio Klev AS | Professional & scientific | 2024 |
| Studio Lie AS | Professional & scientific | 2018 |
| Studio Sæbø AS | Manufacturing | 2024 |
| Studio Verkstedet Da | Manufacturing | 2017 |
| Stumpf Holding AS | Real estate | 2010 |
| Stumpf Invest AS | | 2026 |
| Stumpfgården AS | Real estate | 2004 |
| STYREPARTNER1 AS | Professional & scientific | 2025 |
| STYREPARTNER1 Datter AS | Real estate | 2025 |
| Styringsgruppen Holding AS | Information & communication | 2006 |
| Styrmind AS | Information & communication | 2026 |
| Stå På Holding AS | Construction | 2019 |
| Stål-Consult AS | Professional & scientific | 1987 |
| Stålprofil Sør AS | Wholesale & retail | 2006 |
| Stålveien 9 AS | Real estate | 2005 |
| Stær Distribusjon AS | Information & communication | 2025 |
| Stødle AS | Professional & scientific | 2021 |
| Støleheia Park Bruliheia AS | Real estate | 2020 |
| Støleheia Park Eptevann AS | Real estate | 2024 |
| Støodden Båthavn AS | Real estate | 2013 |
| Støodden Invest AS | | 2024 |
| Støodden Næring AS | Real estate | 2010 |
| Støodden Utvikling AS | Real estate | 2009 |
| Støwer Invest AS | Information & communication | 2022 |
| Sub Kristiansand AS | Hospitality | 2008 |
| Sub Lillemarkens AS | Hospitality | 2021 |
| Sub Senteret AS | Hospitality | 2021 |
| Substans Film AS | Information & communication | 2012 |
| Substans Management&Consulting AS | Professional & scientific | 2014 |
| Subwing AS | Manufacturing | 2011 |
| Suitclix AS | Wholesale & retail | 2019 |
| Suitup AS | Wholesale & retail | 2026 |
| Suksessklubb AS | Education | 2023 |
| Sumatra AS | Professional & scientific | 1996 |
| Summit AS | Financial services | 1995 |
| Sumo Media AS | Professional & scientific | 2017 |
| Sun Net AS | Construction | 2014 |
| Sun-Net Norge AS | Wholesale & retail | 2022 |
| Sundays Design AS | Wholesale & retail | 2013 |
| Sundays Eiendom AS | Real estate | 2022 |
| Sundsdøl Og Vindvand Gård Ans | Agriculture & fishing | 1999 |
| Sunflower Productions AS | Information & communication | 2023 |
| Sunhill AS | Professional & scientific | 2005 |
| Sunny Side Up AS | Professional & scientific | 2008 |
| Sunray Shadow Invest AS | Real estate | 2021 |
| Supernova Transport AS | Transport & logistics | 2012 |
| Superstruct IP AS | Professional & scientific | 2025 |
| Superstruct Norge 2 AS | Arts & recreation | 2021 |
| Supras AS | Professional & scientific | 2013 |
| Sure Epler AS | Real estate | 2014 |
| Surface Dynamics AS | Professional & scientific | 2010 |
| Surftec AS | Manufacturing | 1992 |
| Susanne Knutsen AS | Professional & scientific | 2019 |
| Susanne Sølling AS | Wholesale & retail | 2017 |
| Suscon AS | Professional & scientific | 2018 |
| Sushi Kristiansand AS | Hospitality | 2025 |
| Sustainable Materials AS | Professional & scientific | 2009 |
| Suvatne AS | Transport & logistics | 2020 |
| Svaberg Arkitektur Og Plan AS | Professional & scientific | 2010 |
| Svai Eiendom AS | Real estate | 2023 |
| Svanedamsveien 10 AS | Real estate | 2006 |
| Svanedamsveien Eiendom AS | Real estate | 2021 |
| Svanedamsveien Partner AS | Real estate | 2022 |
| Svanedamsveien Utvikling AS | Real estate | 2017 |