| Roxar Services AS | Manufacturing | 1998 |
| Roxar Software Solutions AS | Information & communication | 1986 |
| Roxar Technologies AS | Professional & scientific | 2010 |
| Royal Unibrew Norge AS | Manufacturing | 2021 |
| Run&Relax Scandinavia AS | Manufacturing | 2011 |
| Runway Exploration AS | Professional & scientific | 2025 |
| Runwayfbu Holding AS | | 2024 |
| Rygg Og Ledd Klinikken AS | Health & social care | 2017 |
| Rolf Lycke Invest A/S | Real estate | 1987 |
| Råflaks AS | | 2021 |
| Rødshøgda AS | | 2013 |
| Rødstrand Holding AS | | 2023 |
| Røyken Sentrum AS | Real estate | 2012 |
| Røyken Sentrumsutvikling AS | Real estate | 2000 |
| S&P Services AS | Professional & scientific | 2021 |
| Sah Holding AS | Real estate | 2008 |
| Sam Agency AS | Wholesale & retail | 2007 |
| Sam Eiendomspartner AS | Real estate | 2011 |
| Sam Invest AS | Real estate | 2022 |
| Sam Krøttøy AS | Real estate | 2022 |
| Samskip AS | Transport & logistics | 1988 |
| Samskip HF | Transport & logistics | 2007 |
| Samskip Logistics AS | Transport & logistics | 2017 |
| Samskip Multimodal B.V. Nuf | Transport & logistics | 2016 |
| Sana Pharma Management AS | Wholesale & retail | 2014 |
| Sana Pharma Medical AS | Wholesale & retail | 1994 |
| Sandia Eiendomsforvaltning AS | Construction | 2006 |
| Sandia Holding AS | Real estate | 1997 |
| Sandia Megling AS | Real estate | 1994 |
| Sandvika Eiendom AS | Real estate | 2005 |
| Sannergata 25 AS | Real estate | 2020 |
| Sanofi-Aventis Norge AS | Wholesale & retail | 1996 |
| Sanor AS | Professional & scientific | 2026 |
| Santander Consumer Bank AS | Financial services | 2001 |
| Santo AS | Real estate | 1970 |
| Sap (Beijing) Software System | Information & communication | 2011 |
| Sap Labs LCC | Information & communication | 2016 |
| Sauda I AS | Real estate | 2026 |
| SB Finans AS | | 2021 |
| SB Investor AS | | 2021 |
| SC Mobility AS | Administrative & support | 2023 |
| Scan-Shipping Norway AS | Transport & logistics | 2006 |
| Scandic Services AS | Transport & logistics | 2026 |
| Scanway Shipping AS | Transport & logistics | 1976 |
| Schatvet Underholdning AS | Arts & recreation | 2026 |
| Schultz Partners AS | Professional & scientific | 2015 |
| Seapin AS | | 2026 |
| Seaway Shipping AS | Transport & logistics | 2000 |
| Sectra Norge AS | Information & communication | 1995 |
| Seetee AS | Information & communication | 2020 |
| Seilduksfabrikken Da | Real estate | 1998 |
| Seilduksfabrikken Holding AS | | 2021 |
| Sem Drift AS | Administrative & support | 2023 |
| Semar AS | Professional & scientific | 1980 |
| Sen Holding AS | Real estate | 2011 |
| Sens AS | Wholesale & retail | 2015 |
| Senviro AS | Information & communication | 2024 |
| Servco AS | Wholesale & retail | 2008 |
| Servicetec Airport Operations Norway AS | Information & communication | 2015 |
| Seut Utvikling AS | Real estate | 2017 |
| SGM Technology AS | Manufacturing | 2014 |
| Shanti Holding AS | | 2023 |
| Shark Eiendom AS | Real estate | 2016 |
| She Community AS | Education | 2015 |
| Shibui AS | | 2023 |
| Shop Music AS | Information & communication | 2020 |
| Shotco AS | Real estate | 2021 |
| Siedle Nordic Avdeling Norge Nuf | Wholesale & retail | 2009 |
| Sif II GP AS | | 2018 |
| Signorelli AS | Administrative & support | 2013 |
| Sikkerhetsrådgivning AS | Professional & scientific | 2007 |
| Silenus AS | Wholesale & retail | 2014 |
| Silseth Consulting AS | Professional & scientific | 2012 |
| Silurveien Utvikling AS | Real estate | 2019 |
| Silvaplana AS | | 2017 |
| Simien AS | Professional & scientific | 2019 |
| Sinsen Torg AS | Real estate | 2003 |
| Sintra AS | Administrative & support | 2006 |
| Sister Act AS | Wholesale & retail | 2012 |
| Sivilingeniør Ole a. Westberg AS | Professional & scientific | 2007 |
| Siviløkonom Bent Bugge AS | Professional & scientific | 1994 |
| Skala Utvikling & Bygg AS | Real estate | 2023 |
| Skarsdalen Utvikling AS | Real estate | 2017 |
| Skigaarden Infrastruktur AS | Real estate | 2005 |
| Skinnarbu Eiendom AS | Real estate | 1993 |
| Skinnarbu Holding AS | Real estate | 2000 |
| Skippy AS | Real estate | 2012 |
| Skips AS Tudor | Real estate | 1953 |
| Skjæringa 11 AS | Real estate | 2017 |
| Skogveien 31-35 AS | Real estate | 2020 |
| Skogvik Utvikling AS | Real estate | 2015 |
| Skrovakos AS | Real estate | 2015 |
| Skån AS | Manufacturing | 2023 |
| Slugger Invest AS | Real estate | 2018 |
| Slygje AS | Financial services | 2017 |
| Smartgroup AS | Professional & scientific | 2013 |
| Smarttune AS | Information & communication | 2024 |
| SMC Automation AS | Wholesale & retail | 1997 |
| Snarby Gård AS | Administrative & support | 2024 |
| Snekra AS | Construction | 2010 |