| Sagen Holdingselskap AS | Professional & scientific | 2017 |
| Sahd AS | Wholesale & retail | 2013 |
| Saker & Ting AS | Wholesale & retail | 2016 |
| Sako 1 AS | Administrative & support | 2020 |
| Salong Den'Man AS | Other services | 2004 |
| Salong Finpuss AS | Other services | 2016 |
| SALONG94 Frisør AS | Other services | 1994 |
| Saltfjellveien AS | Real estate | 2020 |
| Samleverket AS | Arts & recreation | 2009 |
| Sandhei Holding AS | Manufacturing | 1997 |
| Sandhei Invest AS | | 2025 |
| Sares AS | Health & social care | 2012 |
| SE Nor AS | Information & communication | 2001 |
| Secdata AS | Wholesale & retail | 2008 |
| Sedat AS | | 2022 |
| Seg Holding AS | Construction | 2005 |
| Selfors Hybelhus Ans | Real estate | 1996 |
| Selforsveien 63-65 AS | Real estate | 2022 |
| Selma Drift AS | Wholesale & retail | 2009 |
| Selveste AS | Professional & scientific | 2021 |
| Senner Holding AS | Professional & scientific | 2022 |
| Sense of North AS | Professional & scientific | 2022 |
| Sensora AS | Education | 2025 |
| Sentinel AS | Professional & scientific | 2020 |
| Sentinel Capital AS | | 2023 |
| Sentrum Auto AS | Wholesale & retail | 1987 |
| Sentrum Auto Eiendom AS | Wholesale & retail | 2013 |
| Sentrum Auto Holding AS | Wholesale & retail | 2011 |
| Sentrum Legegruppe AS | Health & social care | 2012 |
| Sentrumaksen AS | Real estate | 2010 |
| Sentrumsfossen AS | Real estate | 1998 |
| Setera AS | Manufacturing | 2022 |
| SFV2 AS | Real estate | 2022 |
| Shadowmaker AS | Professional & scientific | 2021 |
| Shak AS | Real estate | 2000 |
| Sharif Food AS | Wholesale & retail | 2025 |
| Shastein AS | Real estate | 2011 |
| Sikterigata 4 AS | Real estate | 2013 |
| Sikterigata Eiendom AS | Real estate | 2012 |
| Silje Breimo & Sønner AS | Financial services | 2018 |
| Silmor AS | | 2020 |
| Simtor AS | Professional & scientific | 2022 |
| Sinsta AS | Administrative & support | 2025 |
| Sintef Helgeland AS | Professional & scientific | 2016 |
| Sirkel Reklame AS | Professional & scientific | 2019 |
| Sirumi Drift AS | Construction | 2018 |
| Sirumi Eiendom AS | Real estate | 2019 |
| Sirumi Holding AS | Professional & scientific | 1998 |
| Sirumi Kyst AS | Agriculture & fishing | 2018 |
| Siu Invest AS | Real estate | 2008 |
| Siu Utvikling AS | Real estate | 1998 |
| Siv AS | | 2021 |
| Sivilingeniør Håkon Langseth AS | Professional & scientific | 1998 |
| Sjaaeng Holding AS | | 2025 |
| Sjonfjellet Vindparklag SA | Real estate | 2009 |
| Sjule Holding AS | Real estate | 1986 |
| Sjurreiret AS | Real estate | 2019 |
| Sjursen Design AS | Professional & scientific | 2016 |
| Sjyen AS | Hospitality | 2024 |
| Sjyen Holding AS | Real estate | 2021 |
| Sjøveien Vest AS | Real estate | 2001 |
| Skeidar Mo I Rana AS | Wholesale & retail | 2005 |
| Skillevollen Alpinsenter AS | Arts & recreation | 1987 |
| Skillevollen Is & Tennis AS | Arts & recreation | 2016 |
| Skillevollen Motell AS | Hospitality | 2019 |
| Skjærvik Båt Og Motor AS | Manufacturing | 2020 |
| Skl-Holding AS | | 2021 |
| Skoglund Eiendom AS | Real estate | 1997 |
| Skonseng AS | Professional & scientific | 2009 |
| Skonseng Holding AS | | 2014 |
| Sky House AS | Construction | 2021 |
| Skysoft AS | Information & communication | 2012 |
| Slagfjellet AS | Professional & scientific | 2011 |
| Slegga Invest AS | | 2026 |
| Sletten Hestesportsenter AS | Arts & recreation | 2024 |
| Slipeservice Rana AS | Manufacturing | 2019 |
| Sliptomta Holding AS | Real estate | 2008 |
| Sliptomta Næringsbygg AS | Real estate | 2008 |
| Slitasjeteknikk AS | Manufacturing | 1996 |
| SLR Holding AS | Real estate | 2005 |
| Sma Mineral AS | Manufacturing | 1996 |
| Sma Nordland AS | Mining & quarrying | 2002 |
| Small Step Improvements AS | Professional & scientific | 2024 |
| Smart Løsning AS | Professional & scientific | 2012 |
| Smedplassen Eiendom AS | Real estate | 2013 |
| Smedveien AS | Real estate | 2023 |
| Smeltedigelen Musikkfestival AS | Arts & recreation | 2008 |
| Småkirurgi AS | Health & social care | 2022 |
| Småmotor AS | Manufacturing | 2026 |
| Småtroll Mo AS | Wholesale & retail | 2002 |
| Småvatna Invest AS | | 2023 |
| Sn-Invest AS | Professional & scientific | 2007 |
| Sneip AS | | 2026 |
| Snekkerfabrikken Eiendom AS | Real estate | 2009 |
| Snekkerfirma Bjerkli & Bratt Ans | Construction | 1991 |
| Snekkerløsninger AS | Construction | 2024 |
| Sniptind Holding AS | Real estate | 2002 |
| Sniptind Invest AS | Real estate | 2016 |
| Solid Betong AS | Manufacturing | 2018 |
| Solum Eiendomsutvikling AS | Real estate | 2012 |