| Ring Eiendom AS | Real estate | 1998 |
| Ringeriksveien 5 AS | Real estate | 2005 |
| Ringern Invest AS | Financial services | 2006 |
| Ringstad-Ulvund AS | | 2025 |
| Ringvegen 90 AS | Real estate | 2020 |
| Ringveien 10 AS | Real estate | 1981 |
| Ripel Holding AS | Real estate | 2019 |
| Ripel Utvikling AS | Real estate | 2019 |
| Risa Meyer AS | Professional & scientific | 2014 |
| Ritzi Ltd Nuf | Wholesale & retail | 2006 |
| Riversight AS | Hospitality | 2024 |
| Riverton AS | Wholesale & retail | 2012 |
| RJ Consulting Da | Transport & logistics | 2006 |
| RK & JT AS | Hospitality | 2026 |
| RK Eiendomsinvest AS | Real estate | 2006 |
| RK Investering AS | | 2023 |
| Rk-Regnskap Ans | Professional & scientific | 1988 |
| RL Anleggstavler AS | Construction | 2016 |
| RM Vaktmestertjenester AS | Administrative & support | 2024 |
| RMC Marine Nuf | Professional & scientific | 2018 |
| RMF Holding AS | | 2023 |
| RN Invest AS | Real estate | 2005 |
| Roan-Edu Ans | Education | 2023 |
| Roar Lund Eiendom AS | Real estate | 2000 |
| Roasteriet AS | Manufacturing | 2023 |
| Robert & Douglas AS | Wholesale & retail | 2024 |
| Robert Invest AS | Financial services | 2006 |
| Robertson Maler AS | Construction | 2023 |
| Robøle Elektro AS | Construction | 2024 |
| Rockstad Regnskap AS | Professional & scientific | 2024 |
| Roel Invest AS | Real estate | 2012 |
| Rognstad AS | | 2024 |
| Roi Partner AS | Wholesale & retail | 2021 |
| Rolf Erik Nilsen Murerforretning AS | Construction | 2014 |
| Romfarer United AS | Arts & recreation | 2017 |
| Romnes Drammen AS | Wholesale & retail | 1977 |
| Ronja Studio AS | Wholesale & retail | 2025 |
| Rorbua Potet Og Pølser Da | Hospitality | 1996 |
| Rosen 61 AS | Real estate | 2015 |
| Rosenkrantzgaten 11 AS | Real estate | 1976 |
| Rosenlund Balanse AS | Health & social care | 2024 |
| Rosenvinge Invest AS | Wholesale & retail | 2018 |
| Rosfjord Holding AS | Real estate | 1998 |
| Rosfjord Invest AS | Real estate | 2005 |
| Ross Eiendom AS | Real estate | 2018 |
| Rotar AS | Real estate | 2007 |
| Roth Gruppen AS | Health & social care | 2007 |
| Rotor Holding AS | | 2020 |
| Rox of Norway AS | Real estate | 2018 |
| Roxy AS | Financial services | 2012 |
| Royal Taj AS | Hospitality | 2017 |
| Royaltjenester AS | Administrative & support | 2023 |
| RR Company AS | Construction | 2023 |
| RR Varme AS | Construction | 2024 |
| Rsa Bilutleie AS | Administrative & support | 1974 |
| Rsa Eiendomsutvikling AS | Real estate | 2017 |
| RSH Psykologtjenester AS | Health & social care | 2021 |
| RTC Tech AS | Information & communication | 2010 |
| RTF Holding AS | Wholesale & retail | 2024 |
| Rubber Innovation AS | Manufacturing | 2019 |
| Rubium Eiendom AS | Real estate | 2021 |
| Rudolf Horne AS | Wholesale & retail | 2024 |
| Rugland Holding AS | | 2026 |
| Run Safety AS | | 2026 |
| Runagain AS | Information & communication | 2019 |
| Runar Sørensen AS | Professional & scientific | 1994 |
| Runningen Invest AS | Real estate | 2004 |
| Rush Drammen AS | Arts & recreation | 2018 |
| Ruso Holding AS | | 2025 |
| Rust Gard AS | Real estate | 2023 |
| Rusten Jensen AS | Real estate | 2019 |
| Rutebileiernes Standardiseringsaksjeselskap | Wholesale & retail | 1936 |
| RVM Systems AS | Manufacturing | 1994 |
| RW Anlegg Og Utleie AS | Construction | 2020 |
| Ryd AS | Information & communication | 2008 |
| Ryddelykke Da | Professional & scientific | 2020 |
| Rydfjord Holding AS | | 2021 |
| Ryghgata 6A Eiendom AS | Real estate | 2020 |
| Ryghgata Utvikling AS | Real estate | 2020 |
| Rys AS | Construction | 2014 |
| Rys Eiendom AS | Real estate | 2014 |
| Rys Holding AS | Wholesale & retail | 2014 |
| Rys Møbler AS | Wholesale & retail | 2014 |
| Rådhusgata 5 AS | Real estate | 2015 |
| Rådhusgata AS | Real estate | 2010 |
| Rådhuskvartalet AS | Real estate | 2023 |
| Rådyrkroken AS | Real estate | 2006 |
| Rådyrlia Eiendoms Utvikling AS | Real estate | 2008 |
| Røedlia Utvikling AS | Real estate | 2020 |
| Rønning-Invest AS | | 2022 |
| Rør Og Bygg AS | Construction | 2022 |
| Røraskogen 2 AS | Real estate | 2012 |
| Rørlegger Robert Thorgersen AS | Construction | 2013 |
| Rørreven AS | Construction | 2012 |
| Rørvollveien 29 AS | Real estate | 2022 |
| Røsslyngveien Grendelag SA | Real estate | 1981 |
| Røyseplassen Barnehage SA | Education | 1991 |
| S & B Nedberg AS | Real estate | 2011 |
| S&F Holdings AS | Professional & scientific | 2016 |
| S&H Nest Invest AS | | 2025 |