| Senter for Fremtidsteknologi AS | Professional & scientific | 2016 |
| Sentiri AS | Information & communication | 2024 |
| Sentrum Fysioterapi Bodø AS | Health & social care | 2014 |
| Sentrumslegene Bodø AS | Real estate | 2007 |
| Sentrumspassasjen AS | Real estate | 2015 |
| Sentrumsterminalen Bodø AS | Transport & logistics | 2000 |
| Septeq AS | Water & waste | 2020 |
| Serendib AS | Wholesale & retail | 2013 |
| Seri Invest AS | Professional & scientific | 2019 |
| Seria AS | Information & communication | 2008 |
| Service-Bygg AS | Construction | 2004 |
| Servicerørleggeren Bodø AS | Construction | 2021 |
| Severinsen Tak- Og Byggeservice AS | Construction | 2026 |
| SG1 Holding AS | Real estate | 2019 |
| Shimi Restaurant AS | Hospitality | 2026 |
| Shimi Signatur AS | | 2023 |
| SHN Holding AS | | 2020 |
| Sibecon AS | Professional & scientific | 2005 |
| Sida Invest AS | Financial services | 2010 |
| Sidy Invest AS | | 2024 |
| Siggerud Rammeverksted AS | Manufacturing | 2009 |
| Signal Bredbånd AS | Information & communication | 2002 |
| Signal Marked AS | Information & communication | 2023 |
| Signes Fotterapi AS | Health & social care | 2023 |
| Sigtor Invest AS | | 2008 |
| Sika Eiendom AS | Real estate | 2016 |
| Sikker Arbeidsplass AS | Professional & scientific | 2018 |
| Silikal Nord Norge AS | Construction | 2014 |
| Siljes Trafikkskole AS | Education | 2020 |
| Silvanord AS | Agriculture & fishing | 2015 |
| Simenfa Holding AS | Construction | 2022 |
| Sinus Bodø AS | Construction | 2001 |
| Sirkel Invest AS | Real estate | 2005 |
| Sirkus Eliassen AS | Arts & recreation | 2012 |
| Sirotek AS | Professional & scientific | 2025 |
| Sisisi AS | Financial services | 2005 |
| Sissels Hundeklipperi AS | Other services | 2023 |
| Siste Gang AS | Financial services | 2017 |
| Siste Krona AS | | 2020 |
| Siv.Ing. Ketil Pettersen AS | Professional & scientific | 2019 |
| Sivert Nielsens GT 80 AS | Real estate | 2017 |
| Sivilingeniør Trond Mellerud AS | Professional & scientific | 2013 |
| Sivvi AS | Financial services | 2018 |
| Sjøfartsbygningen AS | Real estate | 1995 |
| Sjøgata 1 AS | Real estate | 2018 |
| Sjøgata 22 AS | Real estate | 1996 |
| Sjøgata 27 AS | Real estate | 2002 |
| Sjøgata 3 AS | Real estate | 2009 |
| Sjøgata 30/32 AS | Real estate | 2019 |
| Sjøgata 34/36 AS | Real estate | 2008 |
| Sjøgata 44 AS | Real estate | 2018 |
| Sjøgata 5 Bodø AS | Real estate | 2021 |
| Sjøgata 5 Og 25 AS | Real estate | 2015 |
| Sjøgata 50 AS | Real estate | 2020 |
| Sjøgata 52 AS | Real estate | 2022 |
| Sjøgata 62-64 Eiendom AS | Real estate | 2007 |
| Sjøgata 8 AS | Real estate | 1999 |
| Sjøgata Eiendomsinvest AS | Real estate | 2013 |
| Sjøgata Legekontor AS | Health & social care | 1994 |
| Sjøgato Invest AS | Health & social care | 2007 |
| Sjøhaug Bygg Bodø AS | Professional & scientific | 2013 |
| Sjøsiden Invest AS | Manufacturing | 2018 |
| Sjøsiden Næringspark AS | Real estate | 2019 |
| SK Consult AS | Professional & scientific | 1974 |
| Skaa Boligstyling AS | Professional & scientific | 2026 |
| Skagen Hotell AS | Hospitality | 1990 |
| Skandinavisk Høyfjellsutstyr Bodø AS | Wholesale & retail | 2008 |
| Skarp Invest AS | Wholesale & retail | 2009 |
| Skartacus AS | | 2024 |
| Skaugvoll Utvikling AS | Real estate | 2021 |
| Skeidar Bodø AS | Wholesale & retail | 1997 |
| Skeiddalen Eiendom AS | Real estate | 2021 |
| SKH Investment AS | | 2023 |
| Skipnes Eiendomsutvikling AS | Real estate | 2003 |
| Skipper Nilsen AS | Transport & logistics | 2026 |
| Skipsholmen Fisk AS | Agriculture & fishing | 2015 |
| Skjellstad AS | Professional & scientific | 2016 |
| Skjellstad Eiendom AS | Real estate | 2023 |
| Skjoldværøyene AS | Real estate | 1997 |
| Sklm Invest AS | | 2025 |
| SKM Holding AS | | 2009 |
| Skomme Records Da | Information & communication | 2013 |
| Skotselv Industrier AS | Manufacturing | 2020 |
| Skram AS | | 2018 |
| SL Eiendomsutvikling AS | Real estate | 2020 |
| SL Holding AS | Real estate | 1987 |
| Sla Eiendom AS | Real estate | 2002 |
| Slaateng AS | Wholesale & retail | 2014 |
| Slettåsen AS | Real estate | 2001 |
| Slikkepotten Eiendom AS | Real estate | 2007 |
| Slim Jim AS | | 2015 |
| Slotnes AS | Professional & scientific | 2006 |
| Slåttlia 20 AS | Real estate | 2019 |
| Smallsoft Utvikling AS | Information & communication | 1998 |
| Smart Fundament AS | Construction | 2025 |
| Smarthotel Bodø AS | Hospitality | 2019 |
| Smut Invest AS | | 2024 |
| Småsnekring AS | Construction | 2015 |
| Snacksnord AS | Real estate | 2013 |
| Snags AS | Wholesale & retail | 2022 |