| Raastadstykket AS | | 2017 |
| Raidon AS | Construction | 2015 |
| Raidon Eiendom AS | Real estate | 2020 |
| Raidon Holding AS | | 2023 |
| Rammemann Nuf | Arts & recreation | 2009 |
| Rasken Transport Frogner AS | Transport & logistics | 2022 |
| Refleks AS | Other services | 2010 |
| Reneordforpenga AS | Professional & scientific | 2024 |
| Reolteknikk Eiendom AS | Real estate | 2014 |
| Request Vectors AS | Education | 2026 |
| Rhosgobel Sound Systems AS | Arts & recreation | 2026 |
| Rikt AS | Professional & scientific | 2007 |
| Rio Pioner AS | Information & communication | 2017 |
| Rio Tech AS | Information & communication | 2018 |
| Roadtech Consulting AS | Professional & scientific | 2024 |
| Rognerud Eiendom AS | Real estate | 2000 |
| Rolstad Invest AS | Wholesale & retail | 2015 |
| Romerike Bygg & Transport AS | Information & communication | 2023 |
| Romerike Geo Holding AS | | 2023 |
| Romerike Geolab AS | Professional & scientific | 2023 |
| Romerike Geoteknikk AS | Professional & scientific | 2021 |
| Romerike Grunnboring AS | Professional & scientific | 2022 |
| Romerike Trafikkskole AS | Education | 2012 |
| Romerike Tungbilservice AS | Other services | 2017 |
| Romobil AS | Information & communication | 2024 |
| Romsaas Litauen AS | | 2008 |
| Rrb-Invest AS | | 2025 |
| RS Prosjekt Konsult AS | Professional & scientific | 2026 |
| Rud Eiendom Og Invest AS | | 2024 |
| Ruge AS | Real estate | 2000 |
| Ruud Eiendom Frogner AS | Real estate | 2005 |
| Ruud Invest Frogner AS | Real estate | 2012 |
| Ruud Snekkerverksted AS | Manufacturing | 2021 |
| S.Business AS | Real estate | 2012 |
| Sac Holding AS | Administrative & support | 2005 |
| Saeter AS | Construction | 2016 |
| Salten Holding Global AS | | 2024 |
| Saltkjel Holding AS | | 2023 |
| Sammy Norge Limited Nuf | | 2007 |
| Sand Rørservice AS | Construction | 2023 |
| Sato AS | Financial services | 2005 |
| Savn AS | Information & communication | 2026 |
| SBK Dekk Og Transport AS | Wholesale & retail | 2013 |
| Scandpoint AS | Real estate | 2021 |
| Scanmix AS | Professional & scientific | 2024 |
| Schottel Nordic AS | Manufacturing | 1929 |
| Scrubbies AS | Professional & scientific | 2024 |
| Second 2 Naan AS | Hospitality | 2022 |
| Secureme AS | | 2023 |
| Senter for Kunnskapsledelse AS | Professional & scientific | 2024 |
| SFS Group Norway AS | Wholesale & retail | 1982 |
| Shah Ventures AS | | 2025 |
| Sigurd Stave AS | Wholesale & retail | 1957 |
| Sikker Regnskap Og Rekruttering AS | Professional & scientific | 2025 |
| Silo Service AS | Administrative & support | 2018 |
| Simconsulting AS | Professional & scientific | 2022 |
| SK Bemanning AS | Administrative & support | 2022 |
| SK Budbil AS | Transport & logistics | 2025 |
| SK Enterprises AS | Hospitality | 2020 |
| SK Produkter AS | Wholesale & retail | 1990 |
| Skaatan Maskin AS | Construction | 2017 |
| Skinnstudumpa Eiendom AS | Real estate | 2017 |
| Skogskraft AS | Agriculture & fishing | 2013 |
| Skotte Holding AS | Construction | 2017 |
| Skytefokus AS | Wholesale & retail | 2015 |
| Skyttern AS | Wholesale & retail | 2025 |
| Smartdigi AS | Information & communication | 2026 |
| Smestad Investments AS | Financial services | 2016 |
| Solbakken 360 AS | Construction | 2018 |
| Soltor Holding AS | | 2022 |
| Solveig Og Bror AS | Real estate | 2005 |
| Sommersne AS | | 2022 |
| Sorknes Barnehage SA | Education | 1990 |
| Speedy Drop Logistics AS | Transport & logistics | 2023 |
| Spelaren AS | Information & communication | 2025 |
| Spesialutleie AS | Administrative & support | 2022 |
| Spone Eiendom AS | Real estate | 2024 |
| Stadssalg AS | Wholesale & retail | 2007 |
| Stadssalg Holding AS | Hospitality | 1997 |
| Stenberg Elektro AS | Construction | 2017 |
| Stian Yssen AS | Administrative & support | 2018 |
| Storsul Transport & Logistikk AS | Transport & logistics | 2017 |
| Stubberudkroken AS | Real estate | 2016 |
| Studio Saks Ans | Other services | 2003 |
| Studio Saks AS | Other services | 2012 |
| Suco Fryst AS | Wholesale & retail | 2021 |
| Superleggera AS | Information & communication | 2015 |
| Sverdvik AS | Financial services | 2013 |
| Sweetescape AS | Manufacturing | 2025 |
| Syeds Eiendom AS | Real estate | 2017 |
| Sigurd Stave Maskin AS | Wholesale & retail | 1986 |
| Sørlie & Nikolaisen 2 AS | Real estate | 2016 |
| Sørlie & Nikolaisen Drift Ans | Real estate | 2011 |
| Sørlie & Nikolaisen Eiendom AS | Real estate | 2016 |
| Sørum Elektriske AS | Construction | 2000 |
| T Bygg Og Montering AS | Construction | 2017 |
| T.Nysæther AS | Real estate | 2013 |
| Team Ski Project AS | Arts & recreation | 2025 |
| Techmec AS | Wholesale & retail | 2020 |
| Teknikk Partner AS | Construction | 2019 |