| RJ Gruppen AS | Construction | 2024 |
| RK Eiendom AS | | 2021 |
| RK Heistad Bolig AS | Construction | 2022 |
| Rk-Holding AS | Construction | 2022 |
| RLB AS | Real estate | 2018 |
| RLH Holding AS | | 2025 |
| RLM Holding AS | Financial services | 2015 |
| RLN - Invest AS | Financial services | 2005 |
| Roars Holding AS | Financial services | 2005 |
| Robelin Holding AS | Education | 2021 |
| Robsen Holding AS | Real estate | 2005 |
| Rock Frisør AS | Other services | 2015 |
| Rogers Trafikkskole AS | Education | 2025 |
| Rokas Eiendom Da | Real estate | 2002 |
| Roligheten Eiendom AS | Real estate | 2026 |
| Rolighetsvegen 7C AS | Real estate | 2016 |
| Rom Sprinkler AS | Professional & scientific | 2015 |
| Rose Carona AS | Real estate | 2015 |
| Rose Eiendom AS | Real estate | 2020 |
| Rose Forvaltning AS | Professional & scientific | 2006 |
| Rose Utvikling AS | Real estate | 2004 |
| Rossbach AS | Real estate | 2019 |
| Rossbach Data AS | Information & communication | 2016 |
| Rossbach Eiendom AS | Real estate | 2021 |
| Rossbach Invest AS | | 2026 |
| Rostille Guiding AS | Administrative & support | 2024 |
| RP Seksjon 5 AS | Real estate | 2024 |
| RP Seksjon 6 AS | Real estate | 2024 |
| RPM AS | Professional & scientific | 2022 |
| RRM Holding AS | | 2026 |
| RSJ AS | Other services | 2025 |
| RSS Holding AS | Real estate | 1993 |
| RT Development AS | Professional & scientific | 2014 |
| Rui Eiendom AS | Real estate | 2007 |
| Rui Holding AS | Real estate | 2007 |
| Rui Varetaxi Holding AS | Transport & logistics | 2024 |
| Ruis Varetaxi AS | Transport & logistics | 1994 |
| Runa Leyser AS | | 2025 |
| Runar S Larsen Holding AS | | 2025 |
| Rune Jacobsen AS | | 1977 |
| Runsrød Invest AS | | 2023 |
| Russelyd AS | Administrative & support | 2021 |
| RW Holding AS | Other services | 2005 |
| Rypevegen 2 AS | Real estate | 2006 |
| Råflott Eiendom AS | Real estate | 2002 |
| Rød Media AS | Professional & scientific | 2023 |
| Rødmyr Panorama AS | Real estate | 2018 |
| Rørlegger Svein Andersen AS | Construction | 2016 |
| Rørleggerekspressen AS | Construction | 2014 |
| Rørleggermester Filip Olsen AS | Construction | 2021 |
| S&C L Holding AS | | 2025 |
| S-Dale AS | | 2023 |
| S-Hub AS | Professional & scientific | 2024 |
| S-Ventures AS | Information & communication | 2024 |
| S-Ø Maskin AS | Construction | 2018 |
| S3 Utvikling AS | Real estate | 2022 |
| Saastad AS | Transport & logistics | 1992 |
| Saastad Eiendom AS | Real estate | 2014 |
| Saastad Syn AS | Wholesale & retail | 2010 |
| Safelink Ahc AS | Professional & scientific | 2016 |
| Safelink AS | Professional & scientific | 2012 |
| Saga HR AS | Professional & scientific | 2021 |
| Sagarino Holding AS | | 2026 |
| Sagliocco Ensemble AS | Arts & recreation | 2016 |
| Saigon Palace Restaurant AS | Hospitality | 2021 |
| Sailors Inn AS | Hospitality | 2011 |
| Saks Consulting AS | Professional & scientific | 2023 |
| Saksen & Co AS | Wholesale & retail | 2026 |
| Saksen Holding AS | | 2026 |
| Salar Frisør AS | Other services | 2014 |
| Salen Bolig AS | Real estate | 2015 |
| Salescom AS | Administrative & support | 2022 |
| Salingstrand Byggsenter AS | Wholesale & retail | 2003 |
| Salingstrand Eiendom AS | Wholesale & retail | 2017 |
| Salingstrand Holding AS | Wholesale & retail | 2005 |
| Salmanor AS | Wholesale & retail | 2018 |
| Salong Hovenga AS | Other services | 2007 |
| Salong Hovenga Da | Other services | 1999 |
| Samco Eiendom AS | Real estate | 1996 |
| Samfosa AS | Real estate | 2020 |
| Samfunnsbygg Rose AS | Real estate | 2020 |
| Samlerbua Da | Wholesale & retail | 2020 |
| Samlerbua Holding AS | Wholesale & retail | 2022 |
| Samlerbua Safe AS | Wholesale & retail | 2020 |
| Samsala Invest AS | Real estate | 2023 |
| Sandersen Motorsenter AS | Other services | 2022 |
| Sandvassbu AS | Real estate | 2026 |
| Sankt Anders AS | Real estate | 2013 |
| Sannas Consulting AS | Information & communication | 2018 |
| Saol AS | Other services | 2024 |
| Sbvp Holding AS | Manufacturing | 2014 |
| Scandinavian Certification AS | Professional & scientific | 2014 |
| Scandinavian Harbour Service AS | Transport & logistics | 1986 |
| Scanjet Ariston AS | Manufacturing | 1998 |
| Scgn AS | Professional & scientific | 2012 |
| Schanke Eiendom AS | Real estate | 2015 |
| Schaper AS | Real estate | 2024 |
| Schwanstrøm Invest AS | | 2025 |
| Schybaj Holding AS | Financial services | 2018 |
| Sebastian Rød Holding AS | Real estate | 2022 |