| Skarvatnet Holding AS | Real estate | 2020 |
| Skarven 1171 AS | Professional & scientific | 2021 |
| Skarvene AS | Real estate | 2008 |
| Skauvik Maskinkonsult AS | Professional & scientific | 2024 |
| Skeidar Trondheim AS | Wholesale & retail | 1993 |
| Skeptisk Film AS | Information & communication | 2026 |
| Sketchberri AS | Professional & scientific | 2022 |
| Ski Linås Boligutvikling AS | Real estate | 2019 |
| Skiab Invest AS | Real estate | 2015 |
| Skiab Norgesfastigheter AS | Real estate | 2021 |
| Skibnes Arkitekter AS | Professional & scientific | 2012 |
| Skibs- & Fiskeriutstyr AS | Wholesale & retail | 1987 |
| Skift AS | Professional & scientific | 2011 |
| Skill Services AS | Construction | 2012 |
| Skille Investments AS | Education | 2023 |
| Skills AS | Professional & scientific | 2010 |
| Skills Fashion AS | Wholesale & retail | 2012 |
| Skillsio AS | Information & communication | 2025 |
| Skils AS | Real estate | 2014 |
| Skim the Scum AS | Hospitality | 2025 |
| Skimagi AS | Arts & recreation | 2016 |
| Skinfakse Invest AS | Real estate | 2020 |
| Skipakrok AS | Real estate | 2008 |
| Skipakrok Eiendom AS | Hospitality | 2012 |
| Skiphamn Holding AS | Real estate | 2022 |
| Skipper Jørgen AS | Real estate | 2017 |
| Skippy Frisør AS | Other services | 1997 |
| Skipsmaling AS | Wholesale & retail | 2008 |
| Skjaldmer AS | | 2025 |
| Skje Invest AS | Real estate | 2006 |
| Skjegstad Eiendom AS | Real estate | 2008 |
| Skjelbred Capital AS | | 2024 |
| Skjetlein Holding AS | Financial services | 2014 |
| Skjetne Maskin Holding AS | | 2018 |
| Skjetnemarkvegen 68 AS | Real estate | 2016 |
| Skjevik AS | Construction | 2015 |
| Skjæra Invest AS | | 2012 |
| Skjærvik Holding AS | Professional & scientific | 2013 |
| Skjærvikhaugan Service AS | Construction | 2021 |
| Skjøstad Eiendom AS | Real estate | 2013 |
| Skog Christiansen AS | | 2025 |
| Skogen Utvikling AS | Information & communication | 2017 |
| Skogens Ro AS | | 2026 |
| Skogmo Gård AS | Real estate | 2025 |
| Skognæringa Kyst SA | Other services | 2013 |
| Skogsbær AS | Financial services | 2018 |
| Skogstad & Ryeng Music AS | Arts & recreation | 2022 |
| Skolara AS | Information & communication | 2024 |
| Skomsvoll Invest AS | Financial services | 2017 |
| Skorstad Engineering AS | Information & communication | 2014 |
| Skotthyllhallen AS | Arts & recreation | 2011 |
| Skoveng Holding AS | Arts & recreation | 2023 |
| Skovgården AS | Real estate | 2020 |
| Skovholt Bonnemaire AS | | 2021 |
| Skrei AS | Real estate | 2015 |
| Skrenten 21 AS | Real estate | 1996 |
| Skride AS | Information & communication | 2020 |
| Skriptr AS | Professional & scientific | 2025 |
| Skrogstad Holding 1 AS | Financial services | 2016 |
| Skrogstad Holding 2 AS | Wholesale & retail | 2016 |
| Skryme AS | | 2020 |
| Skrødal AS | Arts & recreation | 2016 |
| Skrøvseth Holding AS | | 2019 |
| SKT Holding AS | Financial services | 2005 |
| Skuld Invest AS | Information & communication | 2024 |
| Skur 53 AS | Arts & recreation | 2021 |
| Sky Finans AS | Professional & scientific | 2025 |
| Skylight Holding AS | Professional & scientific | 2008 |
| Skylimit Holding AS | | 2021 |
| Skyline Digital Marketing Ans | Professional & scientific | 2025 |
| Skyline Studios AS | Information & communication | 2011 |
| Skylstad Arkitektur AS | Professional & scientific | 2006 |
| Skyttersport AS | Wholesale & retail | 1991 |
| Skyåsen Panorama AS | | 2025 |
| Skyåsveien 32 AS | Real estate | 2020 |
| Skåvik AS | Information & communication | 2026 |
| Skåvik Holding AS | | 2026 |
| Slate European Essential Re (Bogstad) AS | Real estate | 2021 |
| Slate European Essential Re (Norway) I AS | Real estate | 2022 |
| Slate European Essential Re (Norway) II AS | Real estate | 2022 |
| Slate European Holdings (Norway) I AS | Real estate | 2021 |
| Slate European Holdings (Norway) II AS | Real estate | 2021 |
| Slate Norwegian Re (K12 Plot) AS | Real estate | 2023 |
| Slate Norwegian Re (Transit I) AS | Real estate | 2024 |
| Slate Norwegian Re (Transit II) AS | Real estate | 2022 |
| Slate Norwegian Re (WSC) AS | Real estate | 2018 |
| Slatlem Trondheim AS | Wholesale & retail | 1993 |
| Sleepy Turtles AS | Information & communication | 2020 |
| Slepphendt AS | | 2026 |
| Slettebakken Eiendom AS | Real estate | 2013 |
| Slettvoll Trondheim AS | Wholesale & retail | 2004 |
| Sletvold Invest AS | Wholesale & retail | 2012 |
| Sletvoldtunet AS | Real estate | 2007 |
| Slibraken Holding AS | Financial services | 2017 |
| Slidedrain AS | Wholesale & retail | 2020 |
| Slind Invest AS | Administrative & support | 2015 |
| Sling AS | Manufacturing | 2006 |
| SLK Property AS | Real estate | 2017 |
| Slowboat Ans | Agriculture & fishing | 2016 |
| SLT Holding AS | Construction | 2016 |