| Protectivepeel AS | Construction | 2025 |
| Psstømrerfirma AS | Administrative & support | 2023 |
| PT Bil AS | Wholesale & retail | 2022 |
| PVR Energistasjoner AS | Wholesale & retail | 2022 |
| Pyntet AS | Wholesale & retail | 2024 |
| På Hengende Håret AS | Other services | 2025 |
| Pålerud Vannverk SA | Water & waste | 1957 |
| Pålsrud AS | Real estate | 2022 |
| QM Invest AS | Real estate | 2020 |
| Quantum Øverst AS | Other services | 2025 |
| Quasar Assets Norway AS | Real estate | 2017 |
| Quassar HPC Facilities AS | Information & communication | 2007 |
| R. Invest AS | | 2025 |
| R.S Anlegg AS | Construction | 2024 |
| R9 Utvikling AS | | 2023 |
| Raastad & Støyten AS | Transport & logistics | 2026 |
| Raastad Eiendom Ans | Real estate | 1979 |
| Raastad Kran & Transport AS | Transport & logistics | 1987 |
| Rabekkgata 2 AS | Real estate | 1940 |
| Rabekkgata 20 AS | Real estate | 1992 |
| Rafalskaya AS | Wholesale & retail | 2024 |
| Rain International B.V. Nuf | Administrative & support | 2018 |
| Rakbjørg Eiendom AS | Real estate | 2018 |
| Randaberg Butikkeiendom AS | Real estate | 2006 |
| Randi Sørlie Granheim Og Asbjørn Granheim Frukt & Tobakk Ans | Wholesale & retail | 1990 |
| Ranheim Handelseiendom AS | Real estate | 2006 |
| Raufoss Handelseiendom Syd AS | Real estate | 2017 |
| Raveien 269 Sandefjord AS | Real estate | 2013 |
| Ravi Eiendom Da | Real estate | 2002 |
| Rawal Restaurantdrift AS | Hospitality | 2012 |
| Raylee AS | Wholesale & retail | 2023 |
| RBH Invest AS | | 2025 |
| Real Ringerike AS | Real estate | 1973 |
| Regimentsveien 22 AS | Real estate | 2014 |
| Regnorgården AS | Real estate | 2002 |
| Reklamekonsulenten AS | Professional & scientific | 2014 |
| Remadrass AS | Manufacturing | 2024 |
| Ren Nytelse AS | Hospitality | 2026 |
| Ren Start Renhold AS | Administrative & support | 2023 |
| Renox Eiendom AS | Real estate | 2013 |
| Renox Renhold AS | Administrative & support | 2026 |
| Reo Bygg AS | Real estate | 1999 |
| Rettel AS | Administrative & support | 2025 |
| Retvedt AS | Construction | 2016 |
| Reverie & Hope Invest AS | | 2015 |
| Revisorhuset Alj AS | | 2026 |
| Revisorhuset LL AS | | 2026 |
| Revisorhuset RM AS | | 2026 |
| RH VVS AS | Construction | 2026 |
| RHR Ringerike & Hadeland Regnskapsservice AS | Professional & scientific | 2022 |
| RHR Ringerike Regnskapsservice AS | Professional & scientific | 2023 |
| Rike Auto AS | Wholesale & retail | 2023 |
| Rindal Consulting & Eiendom AS | Real estate | 2017 |
| Ring Auto Service AS | Other services | 2015 |
| Ring Bil & Caravan AS | Wholesale & retail | 2020 |
| Ring Boligutleie AS | Real estate | 2023 |
| Ring Bygg Og Maler Entreprenør AS | Construction | 2019 |
| Ring Eiendom Og Invest AS | Real estate | 2002 |
| Ring Eiendomsutvikling AS | Real estate | 2017 |
| Ring Forsikring AS | | 2006 |
| Ring Forskaling AS | Construction | 2021 |
| Ring Holding AS | | 2026 |
| Ring Industriservice AS | Manufacturing | 2023 |
| Ring Interiør AS | Wholesale & retail | 2000 |
| Ring Kapital AS | Information & communication | 1999 |
| Ring Kapp AS | Manufacturing | 2023 |
| Ring Kapp Eiendom AS | Real estate | 2015 |
| Ring Taxi AS | Transport & logistics | 2005 |
| Ringbillett AS | Administrative & support | 2007 |
| Ringbo Bolig AS | Real estate | 2020 |
| Ringbo Eiendom AS | Real estate | 2004 |
| Ringbolig Hønefoss AS | Construction | 2014 |
| Ringcontrol AS | Professional & scientific | 2012 |
| Ringerike Anleggsservice AS | Construction | 1998 |
| Ringerike Anleggstransport AS | Transport & logistics | 1997 |
| Ringerike B&T Holding AS | Construction | 2025 |
| Ringerike Bil AS | Wholesale & retail | 2013 |
| Ringerike Bil Og Antirust AS | Transport & logistics | 2015 |
| Ringerike Bilsenter AS | Other services | 2018 |
| Ringerike Blikk Og Tak AS | Construction | 2025 |
| Ringerike Bruk AS | Real estate | 1974 |
| Ringerike Budstikke Da | Information & communication | 2001 |
| Ringerike Dekkservice AS | Other services | 2024 |
| Ringerike Drift Og Mat AS | Construction | 2018 |
| Ringerike Dyreklinikk AS | Professional & scientific | 2022 |
| Ringerike Eiendom AS | Real estate | 2000 |
| Ringerike Eiendomsutvikling AS | Real estate | 2009 |
| Ringerike Elektro AS | Construction | 2018 |
| Ringerike Finans AS | Manufacturing | 2015 |
| Ringerike Fysioterapi Da | Health & social care | 2004 |
| Ringerike Gjenvinning AS | Real estate | 2026 |
| Ringerike Gjestegård AS | Hospitality | 1999 |
| Ringerike Kiropraktiske Senter AS | Health & social care | 2014 |
| Ringerike Kjøle & Fryseservice AS | Construction | 2014 |
| Ringerike Kulturutvikling AS | Arts & recreation | 2024 |
| Ringerike Liftutleie AS | Administrative & support | 2001 |
| Ringerike Liftutleie Eiendom AS | Administrative & support | 2013 |
| Ringerike Maskinering AS | Manufacturing | 2023 |
| Ringerike Maskinopplæring AS | Education | 2012 |
| Ringerike Medisinske Senter- Legesenter AS | Health & social care | 1996 |