| Ridein AS | Wholesale & retail | 2025 |
| Riis Gårdsdrift AS | Agriculture & fishing | 2016 |
| Risa Forvaltning AS | Financial services | 2005 |
| Ristvedt Og Grande Handel AS | Administrative & support | 2023 |
| Rivningsspesialisten AS | | 2023 |
| Rn-Auto AS | Wholesale & retail | 2026 |
| Rnløvlie AS | Arts & recreation | 2017 |
| Rocketman AS | Arts & recreation | 2024 |
| Rombekk Forvaltning AS | Real estate | 2016 |
| Ron Holding AS | Real estate | 2008 |
| Route 66 International AS | Administrative & support | 2020 |
| RTH Holding AS | Financial services | 2010 |
| Røang AS | Construction | 2002 |
| Rødsen AS | Transport & logistics | 2017 |
| S&L Byggservice AS | Construction | 2021 |
| S.Hjelvik AS | | 2024 |
| S.J. Dressage Da | Arts & recreation | 2007 |
| Salto Invest AS | | 2024 |
| Sami Maler Tjenester AS | Construction | 2016 |
| Sanja Invest AS | | 2022 |
| Scandi Fit AS | Administrative & support | 2024 |
| Scandic Inv AS | Wholesale & retail | 2019 |
| Scansafe AS | Construction | 2017 |
| Scansafe Holding AS | Construction | 2017 |
| Scantec Isc AS | Hospitality | 2025 |
| Scanwest AS | Professional & scientific | 2005 |
| Sci Holding AS | | 2011 |
| Seiersten Feriepark AS | Hospitality | 1970 |
| Servi AS | Wholesale & retail | 1984 |
| Servi Group AS | Wholesale & retail | 1912 |
| Servi Group AS | Wholesale & retail | 2013 |
| Sevencs AS | Information & communication | 2002 |
| Shaw Productions AS | Information & communication | 2024 |
| Sherpa Marketing AS | Professional & scientific | 2016 |
| Sigma Eiendomsutvikling AS | Real estate | 2014 |
| Sine Cura AS | Financial services | 2017 |
| Siwo Invest AS | | 2021 |
| Skadeconsult AS | Professional & scientific | 2016 |
| Skansen Kapital AS | | 2023 |
| Skaret Marina AS | Real estate | 2024 |
| Skavås Holding AS | | 2024 |
| Ski Byggservice AS | Construction | 2014 |
| Skoro Holding AS | Administrative & support | 2019 |
| Skoro Prosjekt AS | Real estate | 2019 |
| Skoro Utvikling AS | Real estate | 2019 |
| Sky Horses AS | Education | 2012 |
| Slettedal AS | Construction | 1988 |
| Slottet-Eiendom AS | Real estate | 2020 |
| Smogelia Invest AS | | 2026 |
| Smæl Invest AS | | 2020 |
| Snos Vinterbro AS | Wholesale & retail | 2016 |
| Solberg Eiendom AS | Real estate | 1995 |
| Solberg Gruppen AS | Real estate | 2005 |
| Soldi AS | Real estate | 2021 |
| Sommerfuglen Media AS | Professional & scientific | 2018 |
| Son Taxi AS | Transport & logistics | 2019 |
| Sport Exploring AS | Wholesale & retail | 2022 |
| Spotless Tekstil AS | Other services | 2026 |
| Ssi Schäfer AS | Professional & scientific | 2017 |
| ST Drift AS | Administrative & support | 2019 |
| Stasjonsdrift Nom-Ray AS | Wholesale & retail | 2020 |
| Stoltenberg & Rossing AS | Construction | 1988 |
| Strandveien Østby AS | Real estate | 2021 |
| Strikka AS | Professional & scientific | 2026 |
| Stronghold AS | Information & communication | 2013 |
| Styleit Interiørarkitekter AS | Professional & scientific | 2009 |
| Svaj Produksjon AS | Manufacturing | 2023 |
| Sveg Holding AS | | 2023 |
| Sveum Rådgivning AS | Professional & scientific | 2024 |
| Syversen Bjertnes AS | | 2025 |
| Syversen Invest AS | | 2023 |
| Søderveggen AS | | 2021 |
| Søndre Hellerud Gård AS | Real estate | 2009 |
| Sørskogen AS | Financial services | 2021 |
| T&T Drift AS | Administrative & support | 2014 |
| T-Eegh AS | | 2021 |
| Taavo AS | Information & communication | 2019 |
| Taavo Holding AS | Information & communication | 2016 |
| Tamburveien 5 AS | Real estate | 2009 |
| Tannlege Anne Torhild Hovda Vinterbro Tannlegekontor AS | Health & social care | 2018 |
| Tasteforge AS | Information & communication | 2024 |
| Tekno-Nor AS | Wholesale & retail | 2005 |
| Telekiosken Vinterbrosenteret AS | Wholesale & retail | 2009 |
| Terje Muri AS | Professional & scientific | 2026 |
| Teru AS | | 2025 |
| Tha Holding AS | Financial services | 2005 |
| The Glamsisters AS | Other services | 2025 |
| Thomas Forfang AS | Financial services | 2005 |
| Thomas Maskin AS | Construction | 2019 |
| Timotei Eiendom AS | Real estate | 2020 |
| Tiptree AS | | 2025 |
| Tlmw AS | Construction | 2018 |
| Tlmw Invest AS | Construction | 2020 |
| TN Arkitekter AS | Professional & scientific | 1997 |
| Toisd 595 Holding AS | | 2023 |
| Tom Hilstan AS | Wholesale & retail | 2011 |
| Tony Invest AS | Construction | 2019 |
| Topp Jobber AS | Administrative & support | 2024 |
| Tose Holding AS | Financial services | 2017 |
| Total Gruppen Invest AS | Construction | 2010 |