| Ruto AS | Wholesale & retail | 2019 |
| RVS Eiendomsdrift AS | Administrative & support | 1994 |
| Rygge Apartments AS | Real estate | 2025 |
| Rygge Bilverksted AS | Other services | 2002 |
| Rygge Boligutvikling AS | Real estate | 2010 |
| Rygge Eiendom Holding AS | Real estate | 2007 |
| Rygge Eiendomsdrift AS | Administrative & support | 2026 |
| Rygge Eiendomsutvikling AS | Real estate | 2009 |
| Rygge Garn AS | Wholesale & retail | 2022 |
| Rygge Renhold & Service AS | Administrative & support | 2018 |
| Rygge Rørleggerservice AS | Construction | 2014 |
| Rygge Ur & Gull AS | Wholesale & retail | 2007 |
| Ryggeveien 123 AS | Real estate | 2017 |
| Ryrmo AS | Real estate | 2022 |
| Rå I Hue Og Varm I Hjerte AS | Education | 2021 |
| Råde Næringseiendom AS | Real estate | 2007 |
| Råde Va-Utvikling SA | Professional & scientific | 2014 |
| Rådhusgaten 1 AS | Real estate | 1997 |
| Rådhusgaten 3 Eiendom AS | Real estate | 2016 |
| Rådhusgaten Holding AS | | 2005 |
| Råsøtt AS | Manufacturing | 2022 |
| Rø Holding AS | | 2021 |
| Røed Café & Galleri AS | Hospitality | 2019 |
| Røed På Jeløy AS | Real estate | 2017 |
| Rørtek Mester AS | Construction | 2026 |
| S Karlsen Holding AS | Construction | 2011 |
| S&N Gruppen AS | Real estate | 2019 |
| S. a. Lie Invest AS | | 2022 |
| S. Solberg Holding AS | | 2022 |
| S10 Holding AS | Professional & scientific | 2025 |
| Sabw AS | Financial services | 2015 |
| Safaris Tours AS | Administrative & support | 2023 |
| Safetynest AS | Administrative & support | 2017 |
| Safir Gullsmedforretning AS | Wholesale & retail | 2001 |
| Safir Gullsmedforretning Rygge AS | Wholesale & retail | 2007 |
| Safrino AS | Real estate | 2016 |
| Sail Adventure AS | Wholesale & retail | 1999 |
| Salcom Droneinspeksjon AS | Professional & scientific | 2023 |
| Salix AS | Real estate | 1996 |
| Sandberg & Co AS | Real estate | 2014 |
| Sandbukta Barnehage AS | Education | 2004 |
| Sandmo Holding AS | Wholesale & retail | 2005 |
| Sandmo Transport AS | Transport & logistics | 2018 |
| Sandtorp Holding AS | Real estate | 2007 |
| Sandvika Bil AS | Wholesale & retail | 2006 |
| Sanela's Hairshop AS | Other services | 2021 |
| Sannem Holding AS | | 2019 |
| Sannvest AS | Real estate | 1982 |
| Sanz AS | Wholesale & retail | 2000 |
| Sara Import AS | Hospitality | 2020 |
| Sarano AS | Health & social care | 2026 |
| Saray Ans | Hospitality | 1995 |
| Sardar & Sønn AS | | 2022 |
| Sarpsborg Frisør AS | Other services | 2023 |
| Sarpsborg Sentrumsbolig AS | Real estate | 2015 |
| Sarpsborg Taxi AS | Transport & logistics | 2022 |
| Sarpsborgveien 2 AS | Real estate | 2005 |
| Sasa Holding AS | Real estate | 2010 |
| Sassy Hair AS | Other services | 2014 |
| Satel Norge AS | Wholesale & retail | 2002 |
| Satima AS | Real estate | 1994 |
| SB Konsult AS | Information & communication | 2018 |
| SB Takst & Prosjekt AS | Professional & scientific | 2025 |
| SC Holding | Real estate | 2017 |
| Scan-Plant Norge AS | Wholesale & retail | 2022 |
| Scandicargo AS | Transport & logistics | 2025 |
| Scandinavian Claims Company AS | Professional & scientific | 1976 |
| Scandinavian E-Health Consultants AS | Health & social care | 2016 |
| Scandinavian Explorer AS | Wholesale & retail | 2007 |
| Scandinavian House AS | Information & communication | 2005 |
| Scandiq AS | Education | 2007 |
| Schindlers AS | Professional & scientific | 2020 |
| Schultz Holding AS | Real estate | 2018 |
| Schultz Invest AS | Real estate | 2017 |
| Scophelp AS | Health & social care | 2018 |
| Scoreboard Games AS | Wholesale & retail | 2022 |
| Scushi AS | Wholesale & retail | 2012 |
| Search Partner Ans | Professional & scientific | 2000 |
| Searib AS | Arts & recreation | 2022 |
| Seas Fabrikker AS | Manufacturing | 1956 |
| Sebes AS | Real estate | 2002 |
| Security Meetings AS | Education | 2021 |
| Seem Invest AS | Financial services | 2005 |
| Seilkaja AS | Transport & logistics | 2026 |
| Selco AS | Financial services | 1998 |
| Select Sport Norge AS | Wholesale & retail | 2004 |
| Selek Norge AS | Wholesale & retail | 1996 |
| Selg Bilen Din AS | Wholesale & retail | 2022 |
| Seljord Butikkeiendom 1 AS | Real estate | 2016 |
| Sellout!Music Ans | Information & communication | 2003 |
| Semantics AS | Information & communication | 2016 |
| Semisignal AS | Professional & scientific | 2023 |
| Sentrum Audio AS | Wholesale & retail | 2017 |
| Sentrum Legesenter I Moss Da | Health & social care | 2025 |
| Sentrum Legesenter Moss Da | Health & social care | 2016 |
| Sentrum Rør AS | Construction | 1988 |
| Seoul Food AS | Hospitality | 2024 |
| Sertifiseringssenteret AS | Education | 2026 |
| Servicepartner Helgeland AS | Information & communication | 2013 |
| Set Invest AS | Financial services | 2013 |