| Rojo Arkitekter AS | Professional & scientific | 1989 |
| Rokap AS | Real estate | 2014 |
| Rolf Isaksen Eiendom AS | Real estate | 2005 |
| Rolf Isaksen Holding AS | Real estate | 2005 |
| Rolig Bare Holding AS | Hospitality | 2016 |
| Rolig Studio AS | Other services | 2026 |
| Roll & Company AS | Information & communication | 2013 |
| Roll Holding AS | Information & communication | 2019 |
| Rolls-Royce Electrical Norway AS | Manufacturing | 2018 |
| Rolmar AS | | 1997 |
| Roluu Holding AS | | 2022 |
| Roluu Limited Nuf | Real estate | 2008 |
| Rolvung Og Brøndsted Arkitekter AS | Professional & scientific | 2021 |
| Rom for Sjelen AS | Professional & scientific | 2015 |
| Rom Til Rom AS | Wholesale & retail | 2023 |
| Romario Invest AS | Real estate | 1986 |
| Romnes Trondheim AS | Wholesale & retail | 1994 |
| Romo Invest AS | Real estate | 2014 |
| Romolslia Auto AS | Other services | 2023 |
| Romolslia Pizza & Grill AS | Hospitality | 2020 |
| Romsdalsgata Eiendom AS | Real estate | 2023 |
| Ronald Eriksen Brevik AS | Financial services | 2005 |
| Ronny Anderssen Holding AS | Professional & scientific | 2012 |
| Rono Eiendom AS | Real estate | 2006 |
| Roomierank AS | Information & communication | 2026 |
| Ropa AS | Financial services | 2013 |
| ROS1DAL Eiendom AS | Real estate | 2018 |
| ROS1DAL Holding AS | Construction | 2018 |
| Rosario Invest AS | Real estate | 2006 |
| Rosenbakk AS | Construction | 2014 |
| Rosenborg Apotek AS | Wholesale & retail | 2020 |
| Rosenborg Bakeri AS | Manufacturing | 1989 |
| Rosenborg Ballklub Holding AS | Arts & recreation | 2020 |
| Rosenborg Dampbakeri AS | Real estate | 2021 |
| Rosenborg Gate 12 AS | Real estate | 2017 |
| Rosenborg Gate 13A AS | Real estate | 2019 |
| Rosenborg Gate 17 B AS | Real estate | 2020 |
| Rosenborg Gate 7-11 AS | Real estate | 1966 |
| Rosenborg Malerteam AS | Construction | 1994 |
| Rosenborg Marketing Ans | | 1992 |
| Rosenborg Murhåndtverk AS | Construction | 2020 |
| Rosenborg Reklame AS | Professional & scientific | 1990 |
| Rosenborg Renhold Og Flyttebyrå AS | Administrative & support | 2021 |
| Rosenborg Sport AS | Arts & recreation | 1987 |
| Rosenborgbanen AS | Real estate | 2006 |
| Rosenborggt. 14 AS | Real estate | 2019 |
| Rosenborgklinikken Fysioterapi AS | Real estate | 2014 |
| Rosendal Bygg AS | Construction | 2021 |
| Rosendal Malerservice AS | Construction | 2023 |
| Rosenhaug Kapital AS | | 2025 |
| Rosenhaug Teco AS | Professional & scientific | 2015 |
| Rosenkrone AS | Other services | 2011 |
| Rosenlund Holding AS | | 2019 |
| Rosinante AS | Financial services | 2005 |
| Rosmo AS | Real estate | 2005 |
| Rosmo Holding AS | | 2018 |
| Rosshjellen AS | | 2024 |
| Rossvold Tech Holding AS | Professional & scientific | 2023 |
| Rosted Energi Nidarvoll AS | Wholesale & retail | 2010 |
| Rosted Invest AS | Wholesale & retail | 2022 |
| Rosten Eiendom AS | Real estate | 1993 |
| Rosten Legesenter AS | Health & social care | 1993 |
| Rostendal AS | Real estate | 2017 |
| Rothor Restaurantdrift AS | Hospitality | 2022 |
| Rotvoll Eiendom AS | Real estate | 2009 |
| Rotvoll Kunstnerkollektiv SA | Real estate | 2020 |
| Rotvoll Nedre AS | Real estate | 2014 |
| Rova Trafikkskole AS | Education | 2026 |
| Roverk AS | Construction | 2026 |
| Rovito AS | Real estate | 2022 |
| Rowre AS | Wholesale & retail | 1997 |
| Roya Gaarden AS | Health & social care | 2012 |
| Royal Cloud Solutions | Information & communication | 2018 |
| Royal Garden Eiendom AS | Real estate | 2025 |
| Royal Haircut AS | Other services | 2005 |
| RP Bolig AS | Real estate | 2025 |
| RP Railing & Stair Service AS | Real estate | 2014 |
| Rpa Holding AS | | 2026 |
| RPB Holding AS | | 2020 |
| RR Partnerinvest AS | Real estate | 2020 |
| RR Store AS | Wholesale & retail | 2022 |
| Rrmr Holding AS | Wholesale & retail | 2025 |
| RS Invest Norway AS | | 2014 |
| RSB Solutions AS | Professional & scientific | 2026 |
| RSD Invest AS | | 2021 |
| RSK Bygg AS | Real estate | 2015 |
| RSR AS | Wholesale & retail | 2024 |
| Rto Invest AS | Financial services | 2005 |
| Ruameco Development AS | Professional & scientific | 2026 |
| Rubb & Stubb Eiendom AS | Real estate | 2010 |
| Rubedo Bioscience AS | Professional & scientific | 2026 |
| Rubiks AS | Hospitality | 2017 |
| Rubiks Holding AS | | 2020 |
| Rucola AS | Hospitality | 2020 |
| Rugelsjøen Maritime AS | Professional & scientific | 2021 |
| Rugged AS | Information & communication | 2026 |
| Rumi AS | Real estate | 1998 |
| Runa AS | | 2021 |
| Runar Buvik AS | Information & communication | 2006 |
| Rundhaugen Holding AS | Real estate | 2024 |