| Roxar Flow Measurement AS | Manufacturing | 1997 |
| Roy Henrik Eide Holding AS | | 2022 |
| Royal Pizza Og Grill AS | Hospitality | 2023 |
| Royal Trim Ad AS | Other services | 2025 |
| Royk's AS | Hospitality | 2023 |
| RPG Norge AS | Mining & quarrying | 2019 |
| RPM Solutions AS | Professional & scientific | 2024 |
| RPS Eiendom AS | Real estate | 2007 |
| RR Drift AS | Hospitality | 2017 |
| RR Investering AS | | 2026 |
| RR Venture AS | Financial services | 2023 |
| RS Auto AS | Wholesale & retail | 2020 |
| RS Holding Group AS | | 2023 |
| RS Kontor AS | Real estate | 2018 |
| RS Vedlikehold AS | Construction | 2016 |
| Rs.Hodne Holding AS | | 2021 |
| Rs.Holding AS | | 2010 |
| RSC AS | Real estate | 2018 |
| Rsi Investering AS | | 2013 |
| RSK Da | Energy | 2022 |
| RSM 1 AS | | 2014 |
| RSM 2 AS | Professional & scientific | 2014 |
| RSP Invest AS | | 2025 |
| RST Bolig AS | Real estate | 2024 |
| RST Fyr Og Flis AS | Construction | 2025 |
| RT Energy Advisory AS | Professional & scientific | 2025 |
| Rt-Eiendom AS | Real estate | 2010 |
| RTJ Kapital AS | Financial services | 2013 |
| RTR Smart AS | Professional & scientific | 2023 |
| Ru Travel AS | Transport & logistics | 2024 |
| Rubbel Og Bit AS | | 2026 |
| Rubberstyle AS | Manufacturing | 1998 |
| Rubi Data AS | Wholesale & retail | 2010 |
| Rubicon Design Ans | Professional & scientific | 1991 |
| Ruca AS | | 2001 |
| Rucla AS | Professional & scientific | 2007 |
| Rudlå Invest AS | | 2022 |
| Rufa Eiendom AS | Real estate | 2008 |
| Rufa Trading AS | Manufacturing | 2008 |
| Ruffen Hårdesign Ans | Other services | 1989 |
| Rugland Finans AS | Financial services | 2005 |
| Ruha Invest AS | Professional & scientific | 2005 |
| Rumag Holding AS | Professional & scientific | 2025 |
| Rumag Skilt Og Reklame AS | Professional & scientific | 2000 |
| Rumleskaft AS | | 2021 |
| Run Activity AS | Information & communication | 2026 |
| Run Holding AS | | 2024 |
| Runar Kvant AS | | 2025 |
| Runar Lillegård Holding AS | Financial services | 2018 |
| Rune Ellingsen Holding AS | Hospitality | 2014 |
| Rune Kapital AS | Financial services | 2013 |
| Rune Lyse Eiendom AS | Transport & logistics | 2005 |
| Runestad Holding AS | Construction | 2017 |
| Runestad Investering AS | Real estate | 2017 |
| Runestad Investering Utvikling AS | Real estate | 2019 |
| Rung Thip Thai Massasje AS | Other services | 2021 |
| Running Aeonian AS | | 2020 |
| Rush Stavanger Forus AS | Arts & recreation | 2017 |
| Russell Invest AS | Professional & scientific | 2017 |
| Russelåter.No AS | Information & communication | 2022 |
| Russeprofilering AS | Wholesale & retail | 2026 |
| Ruyters Premium Car Care AS | Other services | 2023 |
| Ruyters Premium Car Care Products AS | Other services | 2023 |
| Ry Øst AS | Hospitality | 2024 |
| Ryakva AS | Professional & scientific | 2020 |
| Ryd Holding AS | Real estate | 2023 |
| Rydland Invest AS | Professional & scientific | 2018 |
| Ryensvingen 9 Eiendom AS | | 2022 |
| Ryfy Tech AS | Information & communication | 2021 |
| Ryfylke Dampskibsselskab AS | Arts & recreation | 1995 |
| Ryfylkegaten Eiendom AS | Real estate | 2013 |
| Ryfylketurer AS | Construction | 2014 |
| Ryfylkevegen Prosjekt AS | Real estate | 2025 |
| Ryger Advokatfirma AS | Professional & scientific | 2017 |
| Ryger Bygg AS | Construction | 2022 |
| Ryger Eiendom AS | Real estate | 2025 |
| Ryger Holding AS | Real estate | 2025 |
| Ryger Sports AS | Arts & recreation | 2013 |
| Rygir AS | Wholesale & retail | 2020 |
| Rygir HT AS | Administrative & support | 2026 |
| Rygir Industrier AS | Real estate | 2000 |
| Rygir Tomteutvikling AS | Real estate | 2013 |
| Rogaland Rekvisita AS | Wholesale & retail | 1984 |
| Råderett AS | Health & social care | 2023 |
| Rådesign AS | Construction | 2015 |
| Rådhusmarka AS | Real estate | 2017 |
| Råheim Eiendom AS | Real estate | 2005 |
| Røisti AS | | 2023 |
| Rønning Elektro AS | Construction | 1967 |
| Rønning Gruppen AS | Hospitality | 2010 |
| Rør & Bad Service AS | Construction | 2016 |
| Rør Comfort AS | Construction | 1995 |
| Rør Comfort Eiendom AS | Administrative & support | 2025 |
| Rør-Service AS | Construction | 1986 |
| Rørleggerfirma Stølsvik AS | Construction | 1990 |
| Rørleggermester Arve Nilsen AS | Construction | 2016 |
| Røros Kildevann AS | Manufacturing | 2026 |
| Rørtvedt AS | Wholesale & retail | 2023 |
| Rørtvedt Sko AS | Wholesale & retail | 2023 |
| Røynebergsletta 29 AS | Real estate | 2018 |