| PRT Travel Norge Da | Administrative & support | 2004 |
| Psykolog Brian Østrup AS | Health & social care | 2022 |
| Psykolog Nina Virani AS | Health & social care | 2024 |
| Psykomatikk AS | Health & social care | 2021 |
| Ptbd Holding AS | | 2025 |
| Pulsverk AS | Administrative & support | 2023 |
| Pust Fredrikstad AS | Wholesale & retail | 2023 |
| Pål Ryen Holding AS | Financial services | 2008 |
| Pøh Holding AS | Real estate | 2023 |
| Qwerty AS | Arts & recreation | 2019 |
| R-J Holding AS | | 2021 |
| R. Skauen Holding AS | Financial services | 2018 |
| R.Kjønigsen Invest AS | Financial services | 1986 |
| R36 Services AS | Transport & logistics | 2025 |
| Raabakk Holding AS | Manufacturing | 2013 |
| Raabakk Manufacturing AS | Manufacturing | 2013 |
| Raadhuset Frisør AS | Other services | 2016 |
| Rabagast Productions AS | Administrative & support | 2024 |
| Raborg Eiendom AS | Real estate | 2025 |
| Radin Eiendom AS | Real estate | 2020 |
| Radin Næringseiendom AS | Real estate | 2023 |
| Radin Utvikling AS | Construction | 2020 |
| Radio Fredrikstad AS | Information & communication | 2025 |
| Radius Østlandet AS | Construction | 2000 |
| Radongruppen AS | Professional & scientific | 2021 |
| Rafinett Dameundertøy AS | Wholesale & retail | 2003 |
| Ragnar Ringstad AS | Wholesale & retail | 2015 |
| Ragon Eiendom AS | Real estate | 2023 |
| Rah AS | Real estate | 2025 |
| Rahel Bilpleie AS | Other services | 2025 |
| RAKETT1 AS | Wholesale & retail | 2012 |
| Rakkestad Flyplass Hangar C AS | Transport & logistics | 2018 |
| Rakkestad Flyplass Hangar D AS | Real estate | 2022 |
| Ramen Fredrikstad AS | Hospitality | 2025 |
| Rammemesteren Kunst Og Hobby AS | Wholesale & retail | 1994 |
| Ramsjø Gårdsbarnehage AS | Education | 2007 |
| Raskbil AS | Wholesale & retail | 2024 |
| Raskere Sterkere Høyere AS | Health & social care | 2013 |
| Rauø AS | Other services | 2007 |
| Raw Events AS | Hospitality | 2026 |
| Re-Drive AS | Wholesale & retail | 2023 |
| Re-Visjon AS | Professional & scientific | 2014 |
| Real Finans AS | Financial services | 2013 |
| Rebel Tattoo AS | Other services | 2023 |
| Red Ocean AS | Professional & scientific | 2010 |
| Regneriet AS | Professional & scientific | 2023 |
| Reholt Eiendom AS | Real estate | 1993 |
| Reholt Tanntekniske Laboratorium AS | Manufacturing | 1982 |
| Reiseguiden No Ans | Wholesale & retail | 2000 |
| Rekylen Da | Wholesale & retail | 2007 |
| Rel Gruppen AS | Wholesale & retail | 2018 |
| Ren Eiendom AS | Real estate | 2019 |
| Ren Såpeindustri AS | Manufacturing | 1984 |
| Ren Såpeindustri Produksjon AS | Manufacturing | 2019 |
| Renbolig Service Og Omsorg AS | Administrative & support | 2007 |
| Renovering Og Eiendomsutvikling AS | Wholesale & retail | 2017 |
| Rep-It Da | Information & communication | 2002 |
| Rep-It Drift AS | Information & communication | 2026 |
| Restaurant Fauna AS | Hospitality | 2024 |
| Restaurant Kong Frederik AS | Hospitality | 2006 |
| Restaurant Køl AS | Hospitality | 2019 |
| Restaurant Lille Italia AS | Hospitality | 2021 |
| Restaurant Mother India AS | Hospitality | 1997 |
| Restauranteiendommer AS | Real estate | 2000 |
| Restaurantinvest AS | Hospitality | 2012 |
| Restaurantselskapet AS | Hospitality | 2011 |
| Revisjon & Rådgivning AS | Professional & scientific | 1992 |
| Rial Holding AS | Construction | 2017 |
| Rih Holding AS | | 2021 |
| Ringvåg AS | Agriculture & fishing | 2020 |
| Rino Hansen AS | Wholesale & retail | 2024 |
| Rino Hansen Profil AS | Wholesale & retail | 2025 |
| RJ Holding AS | Real estate | 1989 |
| RM Bilpleie & Bilsalg AS | Other services | 2019 |
| RM Halden Bilpleie AS | Other services | 2023 |
| Robur Prosjektservice AS | Professional & scientific | 2023 |
| Robur Prosjektservice Holding AS | | 2024 |
| Robust Invest AS | Professional & scientific | 2005 |
| Rocket Fuel AS | Professional & scientific | 2020 |
| Rockstar MGT AS | Professional & scientific | 2023 |
| Rogu Invest AS | Financial services | 2005 |
| Roligmassasjeklinikk AS | Health & social care | 2024 |
| Rolvsøyveien 337 Eiendom AS | Real estate | 2018 |
| Rolvsøyveien 406 AS | Real estate | 2008 |
| Rolvsøyveien Industripark AS | Real estate | 1995 |
| Roselia Barnehage AS | Education | 2025 |
| Roselia Barnehage SA | Education | 1995 |
| Rosenlund 14 AS | Wholesale & retail | 2009 |
| Rosenlund 51 Eiendom AS | Real estate | 2005 |
| Rosenlund Eiendom AS | Real estate | 1995 |
| Rosenlund Holdingselskap AS | Information & communication | 2023 |
| Rosenlund Invest AS | Transport & logistics | 2020 |
| Rosenlund Kjøkkeninteriør AS | Wholesale & retail | 1998 |
| Rosenlund Legesenter AS | Health & social care | 2026 |
| Rostan Holding AS | Real estate | 2020 |
| Rostan Invest AS | | 2024 |
| Royal Engro AS | Wholesale & retail | 1989 |
| RPN AS | Real estate | 2018 |
| RS Holding- AS | Financial services | 2014 |
| RSV AS | Administrative & support | 2012 |