| RS Bad Og Flis AS | Construction | 2019 |
| RS Regnskap AS | Professional & scientific | 2007 |
| Rubus Eiendom AS | | 2022 |
| Rubus Teknologi AS | Information & communication | 2018 |
| Rundhåen AS | | 2021 |
| Rustad Gård AS | Administrative & support | 2012 |
| Rustad Skogtjenester AS | Agriculture & fishing | 2022 |
| RV Byggservice AS | Construction | 2017 |
| Rønning AS | | 2019 |
| Rønning Drift AS | Administrative & support | 2026 |
| Rønning Maskin AS | Construction | 1986 |
| Rørkompetanse AS | Construction | 2022 |
| Rørteam AS | Construction | 1980 |
| S&N Holding AS | | 2018 |
| S-Grenaker Holding AS | | 2022 |
| Saferec AS | Manufacturing | 1982 |
| Saferec Eiendom AS | Manufacturing | 2011 |
| Saga Payments AS | Information & communication | 2024 |
| Sandra Myhrer Eek AS | Education | 2020 |
| Sanselina AS | Manufacturing | 2025 |
| Sectura AS | | 2022 |
| Shipco Transport AS | Transport & logistics | 1999 |
| Shortcar AS | Manufacturing | 2011 |
| Shurdhiqi Holding AS | | 2020 |
| Silkoset AS | Financial services | 2005 |
| Simen Sæther Holding AS | | 2015 |
| Sinober Eiendom AS | Real estate | 2026 |
| Sinus Prima AS | Construction | 2024 |
| Sivah AS | Construction | 2022 |
| SK Dekkservice AS | Wholesale & retail | 2016 |
| SKI4ALL AS | Education | 2020 |
| Slaastad Invest AS | | 2020 |
| Smash Care AS | Administrative & support | 2023 |
| SMB Holding AS | Wholesale & retail | 2005 |
| Smedstad Samdrift Da | Agriculture & fishing | 2003 |
| Smedstad Transport AS | Transport & logistics | 1997 |
| Snekkerkara AS | Construction | 2014 |
| Sofia's Farm AS | Wholesale & retail | 2026 |
| Solhøy Holding AS | Administrative & support | 2005 |
| Solsem Byggservice AS | Construction | 2015 |
| Sort Hjerte AS | Wholesale & retail | 2022 |
| Sprek AS | Arts & recreation | 2016 |
| Stall Eikeberg AS | Arts & recreation | 2010 |
| Stasjonsdrift Muri AS | Wholesale & retail | 2026 |
| Steffen Granerud AS | Real estate | 2014 |
| Stein Arntzen Holding AS | | 2026 |
| Stemke AS | | 2024 |
| Stensvikfjellet Vannsamvirke SA | Water & waste | 2025 |
| Sterigroup AS | Professional & scientific | 2019 |
| Sterimedical AS | Wholesale & retail | 2025 |
| Stian Kroken AS | | 2023 |
| Stijo Holding AS | | 2026 |
| Stokker Nordic Nuf | Wholesale & retail | 2020 |
| Storeys AS | Wholesale & retail | 2018 |
| Støen Service AS | Administrative & support | 2026 |
| Summons AS | Professional & scientific | 2024 |
| Svaabe Eiendom AS | Real estate | 2019 |
| Svan Invest AS | | 2009 |
| Sveen Invest AS | Financial services | 2005 |
| Sæther Elektro AS | Construction | 2024 |
| Sørli Eiendom Og Holding AS | Construction | 2023 |
| Sørumsvegen 15 AS | Real estate | 2020 |
| Sørøst AS | Other services | 2011 |
| Tak Og Beslag AS | Construction | 2022 |
| Tannlege Thomassen AS | Health & social care | 2018 |
| TC Anlegg AS | Construction | 2021 |
| Teamcon Ans | Professional & scientific | 2001 |
| Tek Tomtegraving AS | Construction | 2017 |
| Teppemannen AS | Wholesale & retail | 2018 |
| Terra Nordica AS | Wholesale & retail | 2026 |
| Texas Burger Og Grill Da | Hospitality | 2024 |
| Texas Grill AS | Hospitality | 2024 |
| Thai Kompetanse AS | | 2026 |
| The Hair Heaven Studio AS | Wholesale & retail | 2025 |
| The Norwegian Ibsen Company Productions AS | Arts & recreation | 2023 |
| Thomas Karlsen AS | Information & communication | 2025 |
| Tidløs AS | Construction | 2016 |
| Tikommani AS | Wholesale & retail | 2016 |
| TJ Support Ltd Nuf | Professional & scientific | 2015 |
| TKH AS | Real estate | 2015 |
| Tom-Arild Liseth Holding AS | | 2026 |
| Tomstone AS | Real estate | 2010 |
| Tore Grøndahl Eiendom AS | Real estate | 1992 |
| Tore Grøndahl Holding AS | Real estate | 2008 |
| Torneby AS | Construction | 2024 |
| Tranum AS | Real estate | 2014 |
| Tranum Invest AS | | 2024 |
| Truepoint AS | | 2026 |
| Tuna Melt Club AS | Wholesale & retail | 2025 |
| Uavhengig Kontroll AS | Professional & scientific | 2012 |
| Utleietelt.No AS | Administrative & support | 2015 |
| V.R. Vedlikehold AS | Construction | 2014 |
| Valstadsvingen Eiendom AS | Manufacturing | 2011 |
| Vamsæter Holding AS | | 2025 |
| Vardefjellet Ans | Administrative & support | 1994 |
| Vesiem Invest AS | Real estate | 2026 |
| Vestbygda Treskeservice Da | Agriculture & fishing | 2011 |
| Vestre Onsrud 21 AS | Real estate | 2025 |
| Vestskogen L AS | Real estate | 2024 |
| Veståsen Consult AS | Administrative & support | 2024 |