| R3 Montasje AS | Construction | 2019 |
| R4 Blikkenslagerverksted AS | Construction | 2019 |
| Ra Prosjekt AS | Construction | 2018 |
| Rabb Arkitekter AS | Professional & scientific | 2014 |
| Rabb Invest AS | | 2025 |
| Rabben Bil Og Bilinnredning AS | Real estate | 1991 |
| Rabbenkroken Bil AS | Other services | 2024 |
| Racal AS | Information & communication | 2017 |
| Radontech AS | Professional & scientific | 2021 |
| Raglefant Holding AS | Real estate | 2015 |
| Ragnar Sageie AS | Wholesale & retail | 2005 |
| Ragnar Sundet Invest AS | Real estate | 2004 |
| Ralle AS | Manufacturing | 1988 |
| Ramen Huset AS | Hospitality | 2025 |
| Ramsis AS | Wholesale & retail | 2012 |
| Ramstadbaker AS | Manufacturing | 2024 |
| Raset 19 AS | Real estate | 2017 |
| Raset 21 Eiendom AS | Real estate | 2012 |
| Raset 54 AS | Real estate | 2016 |
| Raset 55 AS | Real estate | 2023 |
| Raset 69 Eiendom AS | Real estate | 1985 |
| Raset 70 AS | Real estate | 2014 |
| Raset Holding AS | Real estate | 2005 |
| Rauland Invest AS | Real estate | 2005 |
| Raymond Klæbo Malerisamling Da | Arts & recreation | 2000 |
| RCR Forvaltning AS | Real estate | 2024 |
| RCR Property AS | Real estate | 2023 |
| RCR Property Group AS | Real estate | 2023 |
| RCR Urban Estate AS | Real estate | 2018 |
| Rebell Eiendom AS | Real estate | 2018 |
| Recanto Zumbi | Administrative & support | 2007 |
| Recul AS | Professional & scientific | 2021 |
| Red Samurai Invest AS | | 2024 |
| Redisch Capital AS | | 2017 |
| Reeipo AS | Information & communication | 2022 |
| Refractory Consulting AS | Professional & scientific | 2012 |
| Reggvig AS | Health & social care | 2021 |
| Regnskap Og Økonomiservice Skien AS | Professional & scientific | 2016 |
| Regnskaps-Team Da | Professional & scientific | 1997 |
| Regnskapsteam AS | Professional & scientific | 2010 |
| Reidulf Tangen AS | Professional & scientific | 2021 |
| Reillinger AS | | 2026 |
| Reinsviken AS | Real estate | 2018 |
| Reiten Holding AS | Financial services | 2013 |
| Rektor Ørns G 1 AS | Real estate | 1992 |
| Rema Tip Top Industry AS | Wholesale & retail | 2012 |
| Remap AS | Construction | 2024 |
| Renegade AS | | 2025 |
| Rennesundveien Veiforening Ba | Real estate | 2005 |
| Renoven AS | Construction | 2015 |
| Rent Miljø I Grenland AS | Administrative & support | 2019 |
| Rentro AS | Other services | 2023 |
| Res Butikkdrift AS | Wholesale & retail | 2007 |
| Reserver Meg AS | Wholesale & retail | 2023 |
| Reservoir Faraday AS | Energy | 2020 |
| Reservoir Faraday Holding AS | Energy | 2020 |
| Reservoir Holding AS | Energy | 2019 |
| Reservoir Newton AS | Energy | 2019 |
| Reservoir Sturgeon AS | Energy | 2020 |
| Resorts Malta Limited Nuf | Administrative & support | 2024 |
| Responsen AS | Professional & scientific | 2019 |
| Resseth Holding AS | Real estate | 2021 |
| Ressurs Accounting AS | Professional & scientific | 2021 |
| Restaurant Henrik & Kompani AS | Hospitality | 2026 |
| Restaurantgruppen Soli Jacobsen AS | Professional & scientific | 2024 |
| Retroplast AS | Water & waste | 2017 |
| Rette Rør AS | Construction | 2018 |
| Revisjonsselskapet AS | Professional & scientific | 1995 |
| Revitek Ans | Wholesale & retail | 1986 |
| Revole AS | Professional & scientific | 2026 |
| RF Dialog AS | Real estate | 2008 |
| RG Utvikling AS | Construction | 2011 |
| Rice and Spice AS | Hospitality | 2021 |
| Richvest AS | | 2025 |
| Riis 8 AS | | 2026 |
| Riis Holding AS | Professional & scientific | 2018 |
| Riis-Johansen AS | | 2019 |
| Riktig Regnskap AS | Professional & scientific | 2023 |
| Riktig Utvikling AS | Professional & scientific | 2023 |
| Rimon Holding AS | | 2026 |
| Rinde Trappa AS | Manufacturing | 2015 |
| Ringvold Eiendom AS | Real estate | 2024 |
| Rinker Eiendomsdrift AS | Administrative & support | 2013 |
| Ripegutu Eiendom AS | Real estate | 2011 |
| Ripegutu Holding AS | Real estate | 2005 |
| Rise Multi Service AS | Manufacturing | 2025 |
| Rising Capital AS | Real estate | 2024 |
| Rising Holdco AS | Hospitality | 2024 |
| Rising Office AS | Real estate | 2020 |
| Rising Property Development AS | | 2026 |
| Rising Regnskap AS | Professional & scientific | 2008 |
| Risingveien Mat AS | Wholesale & retail | 2009 |
| Risøyhavna Holding AS | Real estate | 2024 |
| Ritual AS | Professional & scientific | 2011 |
| Riva Invest AS | Real estate | 2018 |
| RL Marine AS | Manufacturing | 2019 |
| RMJ 1 AS | Real estate | 2018 |
| RMJ 2 AS | Real estate | 2018 |
| RMJ 3 AS | Real estate | 2018 |
| RMJ 4 AS | Real estate | 2018 |