| Stavnemoinvest AS | Real estate | 2002 |
| Stavnes Transport AS | Transport & logistics | 2018 |
| Stavnesli Bygg Og Eiendom AS | Construction | 2019 |
| Stavnevegen 9 AS | Real estate | 2020 |
| Stavnevegen 9 Eiendom AS | Real estate | 2012 |
| Stavset Frisør AS | Other services | 2022 |
| Stavsetmyra Barnehage SA | Education | 1997 |
| Staymate AS | Real estate | 2025 |
| Staymate Da | Real estate | 2023 |
| Stby Invest AS | | 2025 |
| STC Consult AS | Professional & scientific | 2017 |
| Steadfast AS | Professional & scientific | 2016 |
| Stedskaping AS | Information & communication | 2019 |
| Steen & Finndatter AS | Professional & scientific | 2017 |
| Steeninvest AS | | 2021 |
| Steenkonvest AS | Professional & scientific | 2018 |
| Steenski Holding AS | | 2025 |
| Steffensen Consulting International AS | Health & social care | 2025 |
| Stein Saks AS | Other services | 2019 |
| Steinan Huseierlag SA | Real estate | 1985 |
| Steinar Morken Montering AS | Construction | 2001 |
| Steinar Sagen AS | Professional & scientific | 1985 |
| Steinar Sletten Holding AS | Information & communication | 2010 |
| Steinberget AS | Professional & scientific | 1988 |
| Steinberget Holding AS | Professional & scientific | 1996 |
| Steinbra AS | | 2015 |
| Steinergi AS | | 2026 |
| Steingla AS | Real estate | 2024 |
| Steingod AS | | 2025 |
| Steinhardt AS | Wholesale & retail | 2015 |
| Steini Holding AS | Real estate | 2021 |
| Steinkjer Eiendom Holding AS | | 2021 |
| Steinland Multiplan AS | Professional & scientific | 2015 |
| Steinnor AS | Hospitality | 2025 |
| Steinsberg Da | Real estate | 1999 |
| Steinshamn Holding AS | | 2023 |
| Steinsvik AS | | 2006 |
| Steinsvik Group AS | Manufacturing | 2004 |
| Steinvika Holding AS | | 2020 |
| Steinvika Utbygging AS | Real estate | 2015 |
| Steisa Invest AS | | 2019 |
| Stella Polaris Holding AS | | 2022 |
| Stellar Equipment AS | Wholesale & retail | 2016 |
| Stelt Consulting AS | Professional & scientific | 2019 |
| Stendahl Bygg AS | Construction | 2012 |
| Stendahl Eiendom AS | Real estate | 2018 |
| Stendahl Eiendom Holding AS | Real estate | 2021 |
| Stene Eiendom AS | Real estate | 1992 |
| Stene Holding AS | Manufacturing | 2005 |
| Stene Takst AS | Real estate | 2019 |
| Stenersen Eiendom AS | Real estate | 2020 |
| Stensviken 256 Eiendom AS | Real estate | 2014 |
| Stepmaster Trondheim AS | Construction | 2016 |
| Sterten Consulting AS | Agriculture & fishing | 2023 |
| Stetind AS | Real estate | 1993 |
| STG Eiendom AS | Real estate | 2008 |
| Stian Aagaard Holding AS | Arts & recreation | 2021 |
| Stian Aasen Holding AS | | 2025 |
| Stian Lurvik Holding AS | Wholesale & retail | 2014 |
| Stian Samdal Holding AS | | 2026 |
| Stianjo Eiendom Sveberg AS | Real estate | 2019 |
| Stianjo Invest AS | Real estate | 2016 |
| Stiauren Holding AS | Construction | 2017 |
| Sticos AS | Information & communication | 1983 |
| Stien Forlag AS | Information & communication | 2019 |
| Stifinneren AS | Financial services | 2015 |
| Stiftsstaden AS | Real estate | 2000 |
| Stiftsstaden Investeringsselskap AS | Real estate | 1991 |
| Stiftsstaden Prosjektutvikling AS | Real estate | 2011 |
| Stiftsstaden Service AS | Real estate | 2009 |
| Stig Schei AS | Real estate | 2005 |
| Stigelite Trading AS | Information & communication | 2020 |
| Stiger Holding AS | | 2022 |
| Stigs Holdingselskap AS | | 2023 |
| Stigsit AS | Financial services | 2005 |
| Stik 1 AS | Real estate | 2014 |
| Stiklestad Holding AS | Professional & scientific | 2021 |
| Stiklestad Shipping AS | Transport & logistics | 1998 |
| Stiles Holding AS | | 2025 |
| Stiles Invest AS | | 2025 |
| Stilige Vinduer AS | Wholesale & retail | 2006 |
| Stillasmontør AS | Construction | 2016 |
| Stillverk 1 AS | Arts & recreation | 2026 |
| Stiluett Frisør AS | Other services | 2016 |
| Stimuli AS | Education | 2000 |
| Stine Hostad Holding AS | | 2024 |
| Stine Kirknes Holding AS | | 2019 |
| Stip Holding AS | Health & social care | 2024 |
| Stixrud Utvikling AS | Professional & scientific | 2023 |
| Stjern Holding AS | | 2005 |
| Stjørdal Fjernvarme AS | Energy | 2007 |
| Stjørdal Golf AS | Arts & recreation | 2021 |
| Sto Holding AS | | 2017 |
| Stocky AS | Information & communication | 2017 |
| Stojanov AS | Hospitality | 2005 |
| Stok AS | Wholesale & retail | 1998 |
| Stokkan Lys AS | Wholesale & retail | 1999 |
| Stokkbakken Utvikling AS | Real estate | 2021 |
| Stokke & Granheim Events Da | Arts & recreation | 2022 |
| Stokkfjellet AS | Energy | 2018 |