| Sandnes Gatekjøkken Da | Hospitality | 1996 |
| Sandnes Utvikling AS | Real estate | 2010 |
| Sandnessjøen Barnehage AS | Education | 2008 |
| Sandnessjøen Begravelsesbyrå AS | Other services | 2014 |
| Sandnessjøen Bilservice AS | Other services | 2025 |
| Sandnessjøen Camping AS | Hospitality | 1990 |
| Sandnessjøen Dagligvarer AS | Wholesale & retail | 2021 |
| Sandnessjøen Eiendomsservice AS | Professional & scientific | 1998 |
| Sandnessjøen Elektro Service AS | Construction | 2023 |
| Sandnessjøen Event AS | Administrative & support | 2019 |
| Sandnessjøen Fiskeforretning AS | Wholesale & retail | 2000 |
| Sandnessjøen Fjernvarme AS | Energy | 2001 |
| Sandnessjøen Fysikalske AS | Health & social care | 2005 |
| Sandnessjøen Grill AS | Hospitality | 2016 |
| Sandnessjøen Hotelldrift AS | Hospitality | 2019 |
| Sandnessjøen Installasjon AS | Construction | 2013 |
| Sandnessjøen Lavpris AS | Wholesale & retail | 1999 |
| Sandnessjøen Offshoreservice AS | Administrative & support | 2014 |
| Sandnessjøen Parkeringshus AS | Transport & logistics | 2002 |
| Sandnessjøen Rørservice AS | Construction | 2008 |
| Sandnessjøen Solstudio AS | Other services | 2011 |
| Scandinavie Eiendom AS | Real estate | 2011 |
| Schei Fashion AS | Wholesale & retail | 2002 |
| Sealine Products AS | Wholesale & retail | 1999 |
| Seanvest AS | | 2024 |
| Sebeli Frisør AS | Other services | 2024 |
| Segelbergan Barnehage SA | Education | 1992 |
| Semenkovics Holding AS | | 2021 |
| Sentrum Næringshage AS | Professional & scientific | 2001 |
| Sentrum Solstudio Lofoten Da | Arts & recreation | 1999 |
| Sentrumsbutikken AS | Wholesale & retail | 1999 |
| Sentrumsgården Sandnessjøen AS | Real estate | 2018 |
| Sequenti AS | | 2021 |
| SG Eiendomsutvikling AS | Real estate | 2013 |
| Shellsea AS | Transport & logistics | 2016 |
| Sinus AS | Construction | 2002 |
| Sinus Data AS | Wholesale & retail | 2001 |
| Sinus Finans AS | Professional & scientific | 2010 |
| Sinus Fritid AS | Real estate | 2012 |
| Sipo Eiendommer AS | Real estate | 2001 |
| Sissel Holding AS | Wholesale & retail | 2003 |
| Siva Enterprises AS | | 2012 |
| Sjysalt Eiendom AS | Real estate | 2021 |
| Sjøbergs Gate 22 AS | Real estate | 1993 |
| Sjøboden Restaurant & Bar AS | Hospitality | 2005 |
| SK Maskin AS | Construction | 2014 |
| SK Maskin Holding AS | Construction | 2011 |
| Ska Design Ans | Wholesale & retail | 2000 |
| Skagen Invest AS | Financial services | 2015 |
| Skansen Utleie AS | Real estate | 2016 |
| Skin Tonic Sandnessjøen AS | Wholesale & retail | 2020 |
| Skipsaksjeselskapet Ranen AS | Real estate | 1992 |
| SKM Eiendom AS | Real estate | 2010 |
| Skogbruket AS | Agriculture & fishing | 2015 |
| Skorpa Subsea AS | Professional & scientific | 2012 |
| Slagkraftige Rune AS | Information & communication | 2020 |
| Slipen Eiendom AS | Real estate | 2009 |
| Slipen Holding AS | Real estate | 1986 |
| Slipen Mekaniske AS | Manufacturing | 1999 |
| Smits Bygg AS | Construction | 2017 |
| Snapshot Holding AS | | 2021 |
| Solutio Diagnostics AS | Professional & scientific | 2019 |
| Soprano Mat Og Vinhus AS | Hospitality | 2025 |
| Sportshuset AS | Wholesale & retail | 1997 |
| SSJ Trafikkskole AS | Education | 2025 |
| ST Holding S.Sjøen AS | | 2011 |
| Stamnes Invest AS | Financial services | 2019 |
| Statom AS | Construction | 2005 |
| Stein Ludvigsen Holding AS | Real estate | 2006 |
| STF Holding AS | Real estate | 2009 |
| Stil Frisørstudio AS | Other services | 2024 |
| Storelgen SA | Agriculture & fishing | 2020 |
| Strandly Brygge AS | Real estate | 2012 |
| Strendene Bok Ans | Arts & recreation | 2024 |
| Svetek Access AS | Professional & scientific | 2026 |
| Svetek AS | Manufacturing | 1997 |
| Svetek Eiendom AS | Real estate | 1990 |
| Svetek Recruit AS | Administrative & support | 2024 |
| Sykkelboden-Nett AS | Wholesale & retail | 2016 |
| Såpekoker Holding AS | | 2026 |
| Sørra Drift AS | Wholesale & retail | 2000 |
| Sørra Eiendom AS | Real estate | 2009 |
| Sørra Holding AS | Real estate | 2009 |
| Sørvoll Holding AS | | 2021 |
| Søsterhjemmet Bolig AS | Real estate | 2014 |
| T. T. Holding AS | Real estate | 2005 |
| Talseth Holding AS | | 2022 |
| Tanik AS | Professional & scientific | 2015 |
| Tannlege Conrad Müller AS | Health & social care | 2011 |
| Tannlege Kynsveen AS | Health & social care | 1994 |
| Taxiservice AS | Transport & logistics | 1985 |
| Tecmarine AS | Professional & scientific | 2021 |
| Telefag Helgeland AS | Information & communication | 2003 |
| TGM Group AS | Construction | 2005 |
| Thailandopplevelser AS | Administrative & support | 2016 |
| The Hofstad Company AS | | 2026 |
| Timbe AS | Real estate | 2005 |
| Tjøtta Panorama AS | Real estate | 2013 |
| TK Sports Holding AS | Wholesale & retail | 2021 |
| TKG 27-29 AS | Real estate | 2012 |