| Skevig AS | Transport & logistics | 2005 |
| Skevig Lastebiltransport AS | Transport & logistics | 1976 |
| Skipnes Holding AS | Manufacturing | 2021 |
| Skipnes Svenil AS | Manufacturing | 2016 |
| Skippy Senteret AS | Real estate | 2017 |
| Skjerdingstad Næringspark 5 AS | Real estate | 2021 |
| Skjetleinskogen Holding AS | Real estate | 2024 |
| Skjetleinskogen PK AS | Real estate | 2025 |
| Skjetleinskogen Utbyggingsselskap AS | | 2026 |
| Skottvoll Eiendom AS | Real estate | 1958 |
| Skottvoll Holding AS | Real estate | 2005 |
| SKS Eiendom AS | Real estate | 2020 |
| Skse Holding AS | Financial services | 2017 |
| Skybird AS | Real estate | 2006 |
| Smevika AS | Real estate | 2018 |
| Smibygg AS | Real estate | 1977 |
| Småberg Holding AS | | 2021 |
| SNJ Bygg & Montasje AS | Construction | 2025 |
| Snåsa Eiendom AS | Real estate | 2020 |
| Soilman AS | Professional & scientific | 2018 |
| Solbergåsen AS | Real estate | 2017 |
| Solbergåsen Utbygging AS | Real estate | 2022 |
| Solgløtt Holding AS | Real estate | 2024 |
| Solheimsveien 19 AS | Construction | 2010 |
| Soligard AS | Wholesale & retail | 2025 |
| Solli Energi AS | Professional & scientific | 2019 |
| Solsikken Frisør AS | Other services | 2025 |
| Solsletta Hageby D AS | Real estate | 2025 |
| Sorgenfri 16 AS | Real estate | 2022 |
| Splitt Eiendom AS | Real estate | 2025 |
| Spora AS | | 2019 |
| Spot Van Holding AS | Education | 2017 |
| Sprekere Liv AS | Wholesale & retail | 2016 |
| Stall Moheim Da | Agriculture & fishing | 2014 |
| Stav Heimdal AS | | 1992 |
| Stavsjøveien 19B AS | Real estate | 2018 |
| Stavsjøveien Holding AS | Real estate | 2020 |
| Staw Invest AS | | 2025 |
| Steggen Invest AS | Professional & scientific | 2018 |
| Steinan Park B AS | Real estate | 2025 |
| Steinar Munkhaugen AS | Financial services | 2015 |
| Stemek AS | Manufacturing | 2023 |
| Stemek Eiendom AS | Construction | 2023 |
| Stemek Holding AS | Manufacturing | 2023 |
| Stesto AS | Real estate | 2007 |
| Stian Hasselvold Holding AS | | 2025 |
| Stjern Service AS | Administrative & support | 2025 |
| Stjernegrillen AS | Hospitality | 2012 |
| Stokmoveien 1 AS | Real estate | 2002 |
| Storheia Eiendomsmegling AS | Real estate | 2013 |
| Stoum AS | | 2021 |
| Strandvegen 20 AS | Real estate | 2025 |
| Strinda Hageby 1-3 AS | Real estate | 2017 |
| Strinda Hageby 5 AS | Real estate | 2019 |
| Strongbody AS | Education | 2015 |
| Strømdal Holding AS | Real estate | 2019 |
| Studio Fryd Nuf | Other services | 2018 |
| Sugustad AS | Professional & scientific | 2025 |
| Sugustad Invest Limited Nuf | | 2025 |
| Sultan Grill Heimdal Da | Hospitality | 2026 |
| Summit Sports Ans | Wholesale & retail | 2003 |
| Supertakst AS | Professional & scientific | 2013 |
| Svanholm & Pedersen Eiendom AS | Real estate | 2026 |
| Svanholm AS | | 2026 |
| Svarthetta Utvikling AS | Construction | 2005 |
| Sveberg Næringspark Drift AS | Administrative & support | 2021 |
| Sveberg Næringstomt 2 AS | Real estate | 2020 |
| Sveberg Næringstomt 3 AS | Real estate | 2021 |
| Sveberg Næringstomt 4 AS | Real estate | 2022 |
| Svefor Holding AS | Real estate | 2020 |
| Svela AS | | 2005 |
| Svemor Fritidssenter AS | Wholesale & retail | 2002 |
| Svemor Holding AS | Real estate | 2010 |
| Sverre Solberg Holding AS | | 2021 |
| Sverresli AS | | 2021 |
| SWB Holding AS | | 2024 |
| Sweet Heaven AS | Wholesale & retail | 2019 |
| Syl Sinober AS | Real estate | 2025 |
| Syngens AS | Information & communication | 2020 |
| Syver Service AS | Administrative & support | 2017 |
| Sætern Holding AS | Financial services | 2018 |
| Søberg Lagerhotell AS | Real estate | 2018 |
| Søbstadvegen 11 AS | Real estate | 2026 |
| Søbstadvegen 7 AS | Real estate | 2026 |
| Søbstadvegen 7-2 AS | Real estate | 2026 |
| Søbstadvegen 9B AS | Real estate | 2026 |
| Søbstadveien 3 2 AS | Real estate | 2021 |
| Søbstadveien NR 2 AS | Real estate | 2013 |
| Sørbru 1A AS | Real estate | 2014 |
| Sørbruvegen Familiebarnehage AS | Education | 2024 |
| Sørnypan Bruk AS | Agriculture & fishing | 2007 |
| Sørnypan Drift AS | Agriculture & fishing | 2024 |
| Sørø Consulting AS | Professional & scientific | 2017 |
| T Grande Frisør AS | Other services | 1995 |
| T K Barneklær Da | Wholesale & retail | 1986 |
| T. Digre Holding AS | | 2016 |
| T. Helgesen Invest AS | | 2007 |
| T. Munkhaugen AS | Information & communication | 2015 |
| Taho Holding AS | Financial services | 2017 |
| Takeiteasy Invest AS | Professional & scientific | 2024 |