| Siva Bømlo Eiendom AS | Real estate | 2019 |
| Siva Eiendom Holding AS | Real estate | 2002 |
| Siva Eiendomstomter AS | Real estate | 2020 |
| Siva Eyde Eiendom AS | Real estate | 2021 |
| Siva Fe Havsjøveien AS | Real estate | 2011 |
| Siva Fe Kompetansesenteret AS | Real estate | 2019 |
| Siva Fe Nytrøa 1 AS | Real estate | 2019 |
| Siva Fe Parkveien AS | Real estate | 2019 |
| Siva Fe Rammsmoen AS | Real estate | 2008 |
| Siva Fe Veksthuset AS | Real estate | 2013 |
| Siva Finnfjord Eiendom AS | Real estate | 2020 |
| Siva Fjellregionen Eiendom AS | Real estate | 2018 |
| Siva Halden Eiendom AS | Real estate | 2011 |
| Siva Halden Eiendomstomt AS | Real estate | 2020 |
| Siva Herøya AS | Real estate | 1991 |
| Siva Høyanger Eiendom AS | Real estate | 2020 |
| Siva Kaldfjord Eiendom AS | Real estate | 2020 |
| Siva Lista Eiendom AS | Real estate | 2002 |
| Siva Sandnes Eiendom AS | Real estate | 2022 |
| Siva Skjervøy Eiendom AS | Real estate | 2020 |
| Siva Treklyngen Eiendom AS | Real estate | 2022 |
| Siva Tromsø Eiendom AS | Real estate | 2002 |
| Siva Utvikling 5 AS | Real estate | 1988 |
| Siva Utvikling 6 AS | Real estate | 2020 |
| Siva Utvikling 9 AS | Real estate | 2020 |
| Siva Verdal Eiendom AS | Real estate | 2002 |
| Siva Åmot Eiendom AS | Real estate | 2007 |
| Sivafjorden Eiendom AS | Real estate | 2002 |
| Sivar Eiendom AS | Real estate | 2016 |
| Sivert Thonstads Vei 8E AS | Real estate | 2026 |
| Sivilarkitekt Odd Håkon Byberg AS | Professional & scientific | 2008 |
| Sivili AS | | 2022 |
| Sivilingeniør Geir a Sivertsvik AS | Information & communication | 2008 |
| Sivilingeniør Godhavn AS | Professional & scientific | 1986 |
| Sivilingeniørene Harboe Og Leganger AS | Professional & scientific | 2009 |
| Sivilingeniørene Johansson & Ingebretsen Datasystemer Da | Information & communication | 1998 |
| Siving Samuelsen Holding AS | | 2021 |
| Sivsør AS | Real estate | 2011 |
| Sixpack Software Da | Information & communication | 2008 |
| Sizters AS | Wholesale & retail | 2014 |
| SJ & SP Rådgivning AS | Professional & scientific | 2025 |
| SJ Anne Margrethe AS | Arts & recreation | 2016 |
| SJ Byggteknikk AS | Professional & scientific | 2022 |
| SJ Norge AS | Transport & logistics | 2016 |
| Sjaa AS | Financial services | 2016 |
| Sjaastad Holding AS | | 2026 |
| Sjadrak AS | Real estate | 2012 |
| Sjakk Matt AS | Other services | 1987 |
| Sjarp AS | | 2026 |
| Sjefstroll AS | Hospitality | 2015 |
| Sjespersen Bygg AS | Construction | 2018 |
| Sjetneeggen Invest AS | Professional & scientific | 2007 |
| Sji Holding AS | | 2025 |
| Sjokoladebutikken AS | Wholesale & retail | 1969 |
| Sjøberg Arkitekter AS | Professional & scientific | 1994 |
| Sjøfarten AS | Real estate | 2009 |
| Sjøgaten Eiendomsutvikling A/S | Real estate | 1988 |
| Sjøheim AS | Real estate | 1997 |
| Sjølia AS | Construction | 2013 |
| Sjølisen Holding AS | | 2025 |
| Sjøly Holding AS | | 2023 |
| Sjøly Service AS | Administrative & support | 2018 |
| Sjølystvegen 12 Eiendom AS | Real estate | 2021 |
| Sjømandsforeningens Hus AS | Real estate | 1992 |
| Sjømannslegekontoret I Trondheim Da | Health & social care | 2014 |
| Sjøsiden Hovde AS | Real estate | 2015 |
| Sjøsiden Legesenter AS | Health & social care | 2023 |
| Sjøsprøyt AS | Wholesale & retail | 2021 |
| Sjøtroll AS | Hospitality | 2021 |
| Sjøvegen AS | Real estate | 2008 |
| SK Holding AS | Real estate | 2015 |
| SK Stål AS | Manufacturing | 2025 |
| Skaalvik & Holthe AS | Real estate | 2020 |
| Skaalvik Transport AS | Transport & logistics | 2004 |
| Skaanes Holding AS | Real estate | 2017 |
| Skadec Norge AS | Wholesale & retail | 2025 |
| Skaff Holding AS | Financial services | 2010 |
| Skaga Solutions AS | Information & communication | 2026 |
| Skagen Eiendom & Utleie AS | Real estate | 2002 |
| Skagen Eiendomsforvaltning Midt Norge AS | Real estate | 2006 |
| Skagen Regnskap AS | Professional & scientific | 2018 |
| Skald Technologies AS | Information & communication | 2021 |
| Skalleknarpen Bryggeri AS | Manufacturing | 1990 |
| Skandinavisk Høyfjellsutstyr Trondheim AS | Wholesale & retail | 2008 |
| Skandinavisk Prosjektutvikling AS | Professional & scientific | 1982 |
| Skandinavisk Teknologiutvikling AS | Professional & scientific | 2003 |
| Skandinavisk Tre AS | Wholesale & retail | 1984 |
| Skansegata 10 AS | Real estate | 2020 |
| Skansegaten 6 AS | Real estate | 2006 |
| Skansen AS | Real estate | 2000 |
| Skansen Bygg & Betong AS | Real estate | 2008 |
| Skansen Catering AS | Hospitality | 2019 |
| Skansen Elektro AS | Construction | 2020 |
| Skansen Stasjon AS | Real estate | 2017 |
| Skansen Utvikling AS | Wholesale & retail | 2016 |
| Skansevakten AS | Real estate | 2012 |
| Skardfjellet AS | | 2022 |
| Skarre Holding AS | | 2022 |
| Skarstad Eiendom AS | Real estate | 2026 |
| Skarv Technologies AS | Professional & scientific | 2019 |