| Schwimmbadnord AS | Real estate | 2017 |
| Schømer Holding AS | Wholesale & retail | 2021 |
| SCL Norge AS | Professional & scientific | 2006 |
| Scotia AS | Financial services | 1994 |
| Scott & Cathrin Ans | | 1990 |
| Scuttoni Holding AS | | 2026 |
| Sea and Sun Ministries International Inc | Other services | 2006 |
| Seabek AS | Construction | 2012 |
| Sealit Power AS | Professional & scientific | 2005 |
| Sean William Hair AS | Other services | 2025 |
| Seb Holding AS | | 2018 |
| Sebil AS | Wholesale & retail | 2023 |
| Sebra Holding AS | | 2020 |
| Securum Eiendom AS | Real estate | 1989 |
| Seddighi Auto AS | Wholesale & retail | 2025 |
| Sediqi Holding AS | | 2024 |
| Seeme Hair AS | Other services | 2025 |
| Seidr Consult AS | Information & communication | 2025 |
| Sejo AS | | 2020 |
| Selfmade Norge AS | Wholesale & retail | 1989 |
| Seli Viken Tak Og Bygg AS | Construction | 2023 |
| Sellæg AS | Real estate | 2009 |
| Selmer Transport AS | Transport & logistics | 2018 |
| Selskapnorge AS | Professional & scientific | 2021 |
| Semb Holding AS | Real estate | 2001 |
| Sementveien 33 AS | Real estate | 1996 |
| Sendsus AS | Transport & logistics | 2018 |
| Senjahopen AS | Arts & recreation | 2024 |
| Senterbarnehagen Fus AS | Education | 2019 |
| Sentrum Ledd Og Muskelklinikk AS | Health & social care | 1999 |
| Sentrum Tannlegekontor AS | Health & social care | 2001 |
| Sep (Simplify Epower) AS | Professional & scientific | 2022 |
| September Arkitekter AS | Professional & scientific | 2010 |
| September Holding AS | Financial services | 2001 |
| Serinus AS | Transport & logistics | 2017 |
| Serl Bygg AS | Construction | 2023 |
| Sero Essentials AS | Wholesale & retail | 2026 |
| Serv Holding AS | | 2021 |
| Servetech AS | Professional & scientific | 2018 |
| Servicecompaniet Bygg Og Eiendom AS | Construction | 2014 |
| Servo Holding AS | Information & communication | 1980 |
| Sesamnet AS | Professional & scientific | 2002 |
| Seven Holding AS | Financial services | 2018 |
| Seven Home Group AS | Real estate | 2025 |
| Sftt AS | Real estate | 2020 |
| Sga Eiendomsutvikling AS | Real estate | 2019 |
| Sga Holding AS | Real estate | 2020 |
| Sge Eiendom AS | Financial services | 2018 |
| SGT 22 Da | Real estate | 2009 |
| SH Handel AS | Wholesale & retail | 2019 |
| SH Invest AS | Wholesale & retail | 1980 |
| Sh-Tuning Norway AS | Information & communication | 2014 |
| Shaarp Executive Search and Management AS | Professional & scientific | 2025 |
| Shadow Billakkering AS | Other services | 2020 |
| Shadow Company AS | Professional & scientific | 2016 |
| Shahi Grill Restaurant AS | Hospitality | 2023 |
| Shahzad Helsetjenester Da | Health & social care | 2022 |
| Shamo AS | Professional & scientific | 2009 |
| Sharifs AS | Other services | 2022 |
| Sharpe Equity AS | | 2025 |
| Shenger Lastebil Verksted AS | Manufacturing | 2025 |
| Shenger Transport AS | Professional & scientific | 2025 |
| Shilma AS | | 2021 |
| Shine Clinic AS | Other services | 2020 |
| Shinefactory AS | Other services | 2017 |
| Shipae Holding AS | | 2026 |
| SHM Holding AS | Water & waste | 2019 |
| SHM Holding Eiendom AS | Real estate | 2020 |
| Shogun Sushi AS | Hospitality | 2019 |
| Shopnor Sør AS | Wholesale & retail | 2017 |
| Shopnor Vest AS | Wholesale & retail | 2019 |
| Showpi Studio AS | Other services | 2026 |
| SHP Holding AS | Wholesale & retail | 2005 |
| Sibo Bygg AS | Construction | 2021 |
| Sicama Invest AS | | 2025 |
| Sidor Dagligvare AS | Wholesale & retail | 2015 |
| Sifr AS | Information & communication | 2017 |
| Sigma Revisjon Drammen AS | Professional & scientific | 2010 |
| Sigmabad AS | Wholesale & retail | 2008 |
| Signus AS | Professional & scientific | 2008 |
| Sikker Lastebil Transport AS | Transport & logistics | 2019 |
| Sikt Arkitektur AS | Administrative & support | 2019 |
| Sildnes Helse AS | Real estate | 2007 |
| Silesa Holding AS | | 2024 |
| Siljehaug Sustainability AS | Professional & scientific | 2009 |
| Silsand AS | Wholesale & retail | 2019 |
| Siluette AS | Wholesale & retail | 2005 |
| Simei AS | Wholesale & retail | 2006 |
| Simen Øvrebø Konsult AS | | 2013 |
| Sinapse Play AS | Education | 2025 |
| Singh&Company AS | Professional & scientific | 2013 |
| Sinjo AS | Real estate | 2005 |
| Sint AS | Financial services | 2011 |
| Sipcco AS | Financial services | 2005 |
| Sire Holding AS | Manufacturing | 2009 |
| Siren Finvik Holding AS | | 2020 |
| Siri Thaimassasje Og Spa AS | Other services | 2025 |
| Sirocco AS | Wholesale & retail | 2002 |
| Sisen AS | Manufacturing | 2017 |
| Sitamoja AS | Information & communication | 2022 |