| RTH Prosjekt AS | Professional & scientific | 2011 |
| Rubin Holding AS | Manufacturing | 2020 |
| Rudi Larsen Invest AS | Wholesale & retail | 2018 |
| Rug Holding AS | | 2024 |
| Rune Bøen AS | Real estate | 2005 |
| Rune Julsen Holding AS | | 2026 |
| Rune Mikkelsen Eiendom AS | Real estate | 2011 |
| Runes Malerverksted Da | Construction | 1994 |
| Russebetalinger AS | Information & communication | 2017 |
| Rustspesialist Og Bilpleie AS | Other services | 2021 |
| Ryen Agentgt. 2 AS | Real estate | 2005 |
| Ryen AS Eiendom | Real estate | 1963 |
| Ryen Evjekaia 2 B AS | Real estate | 2005 |
| Ryen Farmannsgt. 14 AS | Real estate | 2005 |
| Ryen Finans AS | | 2025 |
| Ryen Storgt. 10 AS | Real estate | 2005 |
| Ryen Storgt. 15 AS | Real estate | 2005 |
| Ryen Storgt. 22/ 24 AS | Real estate | 2005 |
| Ryen Storgt. 33/ 35 AS | Real estate | 2005 |
| Ryen Stortorvet 4/ 8 AS | Real estate | 2005 |
| Ryen Torvet 5/ 7 AS | Real estate | 2005 |
| Ryjo Eiendom AS | Real estate | 2020 |
| RZ Elektro AS | Construction | 2026 |
| Råbekken Eiendomsdrift AS | Real estate | 2026 |
| Råbekksvingen 5 AS | Real estate | 2007 |
| Rådhusplassen 29-33 AS | Real estate | 2019 |
| Rø-La Invest AS | | 2019 |
| Rød Bygg Og Eiendom AS | Real estate | 2019 |
| Rød Invest AS | | 2014 |
| Rørlegger & Håndverker AS | Construction | 2020 |
| Røver AS | Arts & recreation | 2024 |
| S 81 Holding AS | Real estate | 2021 |
| S Gangestad AS | Wholesale & retail | 1980 |
| S-Tech Solution AS | Professional & scientific | 2010 |
| S.C. Pettersen Consulting AS | Professional & scientific | 2024 |
| S.C. Pettersen Invest AS | Professional & scientific | 2024 |
| S.G. Holding AS | Wholesale & retail | 2005 |
| Sadon Invest Limited Nuf | Wholesale & retail | 2024 |
| Sake Invest AS | | 2026 |
| Saku AS | Real estate | 2025 |
| Sakura Fredrikstad AS | Hospitality | 2019 |
| Salgsteam AS | Information & communication | 2023 |
| Salong Ninell Nina Guttormsen Og Ellen Marie Furuhovde Næss Ans | Other services | 1986 |
| Salong Victoria AS | Other services | 2021 |
| Salpro Composite AS | Manufacturing | 2001 |
| Salpro Eiendom AS | Real estate | 2006 |
| Samlivsterapeuten AS | Health & social care | 2018 |
| Samvirkebarnehagene SA | Education | 1989 |
| Sandsiloen AS | Real estate | 1947 |
| Sanne Sofie AS | Real estate | 2019 |
| Sannrud Invest AS | Health & social care | 2017 |
| Sara Helene Holding AS | | 2025 |
| Sarbast AS | Manufacturing | 2024 |
| Sarpsborg Verktøy- Og Maskinfabrikk AS | Professional & scientific | 1967 |
| Satis AS | Health & social care | 2024 |
| Sbkf Videregående Skole AS | Education | 2025 |
| Scak Invest AS | Real estate | 1986 |
| Scandic Corner AS | Wholesale & retail | 2023 |
| Scandinavian Creator Community AS | Information & communication | 2022 |
| Scandinavian Distribution AS | Wholesale & retail | 2023 |
| Scandinavian Drinks AS | Wholesale & retail | 2021 |
| Scandinavian Food Company AS | Wholesale & retail | 2006 |
| Scanmark Service AS | Wholesale & retail | 2018 |
| Scantherm AS | | 2010 |
| Scantrader Consulting AS | Information & communication | 2015 |
| Scenekonsult AS | Arts & recreation | 2023 |
| Screen Harmony AS | Information & communication | 2024 |
| Sea King Marine AS | Transport & logistics | 2012 |
| Sea King Norway AS | Wholesale & retail | 2019 |
| Seal AS | Manufacturing | 2021 |
| Seal Engineering AS | Manufacturing | 2012 |
| Seal Jet Norge Holding AS | Manufacturing | 2012 |
| Seaside Ans | Wholesale & retail | 1991 |
| Seatrench AS | Construction | 2016 |
| Seatrench Equipment AS | Construction | 2007 |
| Seatrench Holding AS | | 2025 |
| Sediment Systems - DR Ing H Støle AS | Professional & scientific | 1994 |
| Sedimentproffen AS | Professional & scientific | 2023 |
| Seeme Care AS | Information & communication | 2026 |
| Segs AS | Information & communication | 2018 |
| Sehested Nuf | Professional & scientific | 2010 |
| Seiersborg Videregående Skole Follo AS | Education | 2020 |
| Seilom Invest AS | Real estate | 1999 |
| Selbak Rør AS | Construction | 2017 |
| SELECT TRADING Norsk avdeling av utenlandsk foretak NUF | Wholesale & retail | 1996 |
| Selmil Holding AS | | 2018 |
| Sembsgt 18 AS | Real estate | 2020 |
| Sense Bolig AS | Real estate | 2019 |
| Sensor Codes AS | Information & communication | 2026 |
| Sentrum Tannlegekontor Holding AS | Financial services | 2012 |
| Serveringsporten AS | Hospitality | 2026 |
| Sevent AS | Administrative & support | 2020 |
| SFB Eiendom & Design AS | Real estate | 2011 |
| SGT. Jam Holding AS | Professional & scientific | 2017 |
| Shahrzad AS | Wholesale & retail | 2020 |
| Shala Bygg Og Eiendom AS | Real estate | 2020 |
| Shala Holding AS | Real estate | 2020 |
| Shamon Snekkeri AS | Construction | 2023 |
| Shamoon Invest AS | Real estate | 2011 |
| Shather Holding AS | Health & social care | 2020 |