| RF Holding AS | | 2022 |
| RG Hotellinvest AS | Real estate | 2017 |
| RG Lighting Service AS | Arts & recreation | 2018 |
| RGH Invest AS | Real estate | 2013 |
| RH Prosjekt AS | Professional & scientific | 2025 |
| RHB1 AS | Real estate | 2021 |
| Ri Ke Holding AS | Real estate | 2013 |
| Rian Blikk AS | Construction | 2024 |
| Riber Holding AS | Professional & scientific | 2012 |
| Ribo Invest AS | Financial services | 1998 |
| Riddlebit AS | Information & communication | 2017 |
| Ride Trondheim AS | Wholesale & retail | 1967 |
| Rieg AS | Financial services | 2006 |
| Riggmaster AS | Wholesale & retail | 2016 |
| Rightway Transport AS | Transport & logistics | 2016 |
| Rigmor Holding AS | | 2022 |
| Rigpa AS | Professional & scientific | 2024 |
| Rihama AS | Hospitality | 2005 |
| Riibe Holding AS | | 2026 |
| Riibe Myntauksjoner AS | Wholesale & retail | 1984 |
| Riibe Mynthandel AS | Wholesale & retail | 1996 |
| Riibegruppen AS | | 1997 |
| Riibo Eiendom AS | Real estate | 1994 |
| Riis Bussglass AS | Other services | 2026 |
| Riis Bygg Trøndelag AS | Construction | 2023 |
| Riis Eiendom AS | Construction | 1985 |
| Riis Mat & Drikke AS | Hospitality | 2025 |
| Riis Mesterglass AS | Administrative & support | 2025 |
| Riis Montasje AS | Other services | 1979 |
| Riis Møllenberg AS | Real estate | 2006 |
| Riise Holding AS | Real estate | 2005 |
| Rik Tid Ltd Nuf | Wholesale & retail | 2009 |
| Rikke Invest AS | | 2005 |
| Rile AS | Real estate | 2019 |
| Rimelig AS | Administrative & support | 2024 |
| Rimfjord AS | Arts & recreation | 2025 |
| Ringdalskogen AS | Real estate | 2009 |
| Ringsider AS | Wholesale & retail | 1997 |
| Ringstad & Company AS | Professional & scientific | 2025 |
| Ringve Legesenter Da | Health & social care | 2010 |
| Ringve Legesenter Eiendom AS | Real estate | 2015 |
| Ringvålvegen 37 AS | Real estate | 2025 |
| Rio Invest AS | | 1996 |
| Riplet AS | Information & communication | 2026 |
| Ripplr AS | Professional & scientific | 2025 |
| Risan Granlund Holding AS | Health & social care | 2021 |
| Risavika Base Invest AS | Real estate | 2017 |
| Rise Pfi AS | Professional & scientific | 2003 |
| Rishaug Event AS | Real estate | 2023 |
| Risk-Assessment AS | Health & social care | 2020 |
| Risnes Rådgivning AS | Professional & scientific | 2007 |
| Risto 80 AS | Financial services | 2016 |
| Risvollan Fysioterapi Da | Health & social care | 2026 |
| Risvollan Legesenter AS | Health & social care | 1993 |
| Risvollan Medisinske Senter AS | Health & social care | 1993 |
| Risvollan Treningssenter AS | Health & social care | 1992 |
| Risvollan Utvikling AS | | 2019 |
| Ritula AS | Real estate | 1983 |
| Rivair AS | Administrative & support | 2022 |
| RJK Capital AS | Real estate | 1980 |
| RK Capital AS | | 2025 |
| RK Montering & Eiendomsservice AS | Construction | 2015 |
| Rki Holding AS | Wholesale & retail | 2005 |
| RL Invest AS | Financial services | 2005 |
| RM Advokater AS | Professional & scientific | 2023 |
| RM Clinical Concepts AS | Health & social care | 2025 |
| Rmanager AS | Information & communication | 2012 |
| RMD Holding AS | Real estate | 2020 |
| Ro Bygg Ans | Real estate | 1989 |
| Roabø AS | | 2024 |
| Road Solutions AS | Information & communication | 2007 |
| Roadrunner 2 AS | Wholesale & retail | 2005 |
| Roadrunner 4 AS | Professional & scientific | 1999 |
| Roaldseth Holding AS | Real estate | 2005 |
| Roan Holding AS | | 2019 |
| Roan Vind Da | Energy | 2020 |
| Roar Aarhaug Agenturer AS | Wholesale & retail | 2001 |
| Roar Hildonen AS | Hospitality | 2005 |
| Roar Steinsvik AS | Other services | 2014 |
| Roar's Billakkering AS | Other services | 2025 |
| Roba AS | Wholesale & retail | 2018 |
| Robata AS | Hospitality | 1995 |
| Robeerst Holding AS | Real estate | 2013 |
| Robert L Holding AS | Financial services | 2017 |
| Robin Hood Holding AS | Financial services | 2013 |
| Robomat AS | Hospitality | 2024 |
| Robust Bemanning AS | Administrative & support | 2023 |
| Robust Management AS | Administrative & support | 2023 |
| Rocci Holding AS | | 2022 |
| Rockit Frisør AS | Other services | 2017 |
| Rodape AS | | 2005 |
| Rodem Holding AS | | 2021 |
| Roei Invest AS | Wholesale & retail | 2020 |
| Roenningen Holding AS | | 2021 |
| Roffa AS | | 2025 |
| Roger Hofstad Invest AS | | 2024 |
| Roger Klausen Invest AS | Financial services | 2008 |
| Rognes Invest AS | Information & communication | 2025 |
| Rognmo Holding AS | Real estate | 2005 |
| Rognrust Og Navelsaker Ans | Hospitality | 1996 |