| S&S Regnskap AS | Professional & scientific | 2025 |
| S. Capital AS | | 2017 |
| S.E.E.I.S. AS | | 2018 |
| S.Erlandsen Invest AS | | 2023 |
| S.Greve Holding AS | | 2024 |
| Saaco AS | Financial services | 2014 |
| Sabeltask AS | Financial services | 2008 |
| Sadiq Eiendom AS | Real estate | 2011 |
| Safe Cycling AS | Administrative & support | 2017 |
| Safety Service AS | Wholesale & retail | 2014 |
| Saga Marketing AS | Wholesale & retail | 2012 |
| Saga Regnskap Drammen AS | Professional & scientific | 2024 |
| Sagatun Bolig AS | Real estate | 2026 |
| Sagatun Eiendomsutvikling AS | Real estate | 2009 |
| Sagen Høst AS | Hospitality | 2023 |
| Saggi Holdings AS | | 2021 |
| Sagvollskogen Utvikling AS | Real estate | 2021 |
| Saheno AS | | 2026 |
| Saht AS | | 2018 |
| Sainvi AS | Wholesale & retail | 2005 |
| Sakura Sushi Drammen AS | Hospitality | 2018 |
| Saleo Invest AS | | 2022 |
| Sali Barbershop AS | Other services | 2022 |
| Salon Exclusive AS | Other services | 2020 |
| Salong Drammen AS | Other services | 2015 |
| Salong Helin Ans | Other services | 1989 |
| Salsburg 2 AS | Real estate | 2006 |
| Salsburg AS | | 2005 |
| Salto Arkitektur AS | Professional & scientific | 2021 |
| Salto Renhold AS | Information & communication | 2017 |
| Sam AS | Transport & logistics | 2025 |
| Sam Electronics GmbH | Professional & scientific | 2013 |
| Sam Import Da | Wholesale & retail | 1997 |
| Sam Tak AS | Construction | 2016 |
| Samalg AS | | 2025 |
| Samir AS | Transport & logistics | 2026 |
| Samler & Antikkbørsen AS | Information & communication | 1993 |
| Samling.No AS | Professional & scientific | 2023 |
| Sand-Hanssen Bygg AS | Construction | 2026 |
| Sandblaaser Service AS | Manufacturing | 2023 |
| Sande Lokalmat AS | Real estate | 2014 |
| Sanderstølen Holding AS | Real estate | 2017 |
| Sanderstølen Vannverk AS | Water & waste | 2015 |
| Sanderud Invest AS | | 2026 |
| Sandli Invest & Holding AS | Construction | 2018 |
| Sandma Holding AS | Financial services | 2005 |
| Sandmo Bilservice AS | Other services | 2012 |
| Sandmo Eiendom AS | Real estate | 1992 |
| Sandtangen Vann Og Avløp SA | Water & waste | 2012 |
| Sandvigen KS | Real estate | 2002 |
| Sans Omsorg AS | Health & social care | 2021 |
| Sansta Adaptive AS | Professional & scientific | 2017 |
| Santi Eiendom AS | Real estate | 2021 |
| Santi Holding AS | Real estate | 2021 |
| Saola AS | Administrative & support | 2024 |
| Sar Auto AS | Administrative & support | 2022 |
| SAR3 Holding AS | | 2019 |
| Sarane AS | Professional & scientific | 2005 |
| Sarepto AS | Information & communication | 2013 |
| Sarto AS | Real estate | 1995 |
| Sasso AS | Construction | 2014 |
| SATCOM1 Integration Services Aps | Wholesale & retail | 2018 |
| Saturn Kommunikasjon AS | Manufacturing | 1988 |
| Satuvi Holding AS | Wholesale & retail | 2023 |
| Satyricon Alive Limited Nuf | Arts & recreation | 2007 |
| Savo Rørleggerbedrift Og Bygg AS | Construction | 2021 |
| Sax Auto AS | Wholesale & retail | 1987 |
| Saxegaard Auto AS | Wholesale & retail | 2000 |
| Saym AS | Construction | 2023 |
| Sbo Eiendom AS | Real estate | 2025 |
| SBS Steam Boiler Service AS | Construction | 2017 |
| Scan-Med AS Norway | Wholesale & retail | 1981 |
| Scandeka AS | Construction | 2018 |
| Scandi Finans Holding AS | Professional & scientific | 2015 |
| Scandi Groom AS | Other services | 2025 |
| Scandi Invest AS | | 1998 |
| Scandia Holding AS | Real estate | 2026 |
| Scandia Hus AS | Real estate | 2026 |
| Scandia Maskin AS | Wholesale & retail | 2021 |
| Scandiaconsult AS | Real estate | 1991 |
| Scandic Select AS | Administrative & support | 2023 |
| Scandinano Autotrade AS | Wholesale & retail | 2024 |
| Scandinavian Beauty and Wellness Technology AS | Education | 2009 |
| Scandinavian Cro AS | Professional & scientific | 2015 |
| Scandinavian Health Supply AS | Health & social care | 2025 |
| Scandinavian Health System AS | Health & social care | 2022 |
| Scandinavian Home Products AS | Wholesale & retail | 1993 |
| Scandinavian Padel Supply AS | Wholesale & retail | 2021 |
| Schale Invest AS | | 2021 |
| Schau Eiendom AS | Real estate | 1967 |
| Schau Eiendom Prosjekt AS | Real estate | 2026 |
| Schau Invest AS | Real estate | 1989 |
| Schenck Handling Systems GmbH | | 1998 |
| Schjølberg Eiendomsholding AS | Real estate | 2024 |
| Schjøttelvik Vann Og Avløp AS | Real estate | 2023 |
| Schouw AS | | 1993 |
| Schuchmann AS | Wholesale & retail | 2022 |
| Schulerudgaarden AS | Real estate | 2014 |
| Schultzgate 22 AS | Real estate | 2006 |
| Schwenk Norge AS | Wholesale & retail | 1989 |