| Ringerike Miljøservice AS | Water & waste | 2019 |
| Ringerike Montessori AS | Education | 2015 |
| Ringerike Næringsfond AS | Professional & scientific | 2021 |
| Ringerike Osteopati Klinikk Da | Health & social care | 2013 |
| Ringerike Pizza & Grill AS | Hospitality | 2015 |
| Ringerike Prosjekt Consult AS | | 2021 |
| Ringerike Pukk Og Sand AS | Mining & quarrying | 2010 |
| Ringerike Septikservice AS | Water & waste | 1987 |
| Ringerike Tannlegesenter AS | Health & social care | 2005 |
| Ringerike Trafikkskole AS | Education | 2014 |
| Ringerike Trepleie AS | Agriculture & fishing | 2025 |
| Ringerike Utemiljø AS | Administrative & support | 2020 |
| Ringerike Utleie Da | Administrative & support | 2004 |
| Ringerike Utvikling AS | Professional & scientific | 2010 |
| Ringerike VVS AS | Construction | 2024 |
| Ringerike Øre Nese Hals AS | Health & social care | 2016 |
| Ringerikes Kornsilo SA | Manufacturing | 1951 |
| Ringeriksbadet AS | Real estate | 2008 |
| Ringeriksgass Ans | Real estate | 2004 |
| Ringerikshus AS | Construction | 2006 |
| Ringerikshus Eiendomsutvikling AS | Real estate | 2017 |
| Ringerikskraft AS | Energy | 1996 |
| Ringerikskraft Produksjon AS | Energy | 2004 |
| Ringerud Drift AS | Construction | 1992 |
| Ringerud Transport AS | Transport & logistics | 2021 |
| Ringit Ans | Information & communication | 2005 |
| Ringkast Invest AS | | 2021 |
| Ringkollen Eiendom AS | Real estate | 2021 |
| Ringkollstua AS | Real estate | 1992 |
| Ringkolltoppen AS | Real estate | 2017 |
| Ringrent AS | Administrative & support | 2016 |
| Ripu AS | Construction | 2016 |
| Rishovd AS | Real estate | 2026 |
| Risør Butikkeiendom AS | Real estate | 2005 |
| Rk-Bil AS | Wholesale & retail | 2018 |
| RKR Hjem & Hage AS | Construction | 2019 |
| RKS AS | Education | 2014 |
| RM Byggfornying AS | Construction | 2017 |
| RMH Holding AS | Professional & scientific | 2005 |
| Roa Syd Eiendom AS | Real estate | 1939 |
| Robatech Nordic No AS | Wholesale & retail | 1995 |
| Robert Eiendom AS | Real estate | 2013 |
| Robot Aviation AS | Professional & scientific | 2020 |
| Robot Aviation AS | Professional & scientific | 2008 |
| Rofi Tak AS | Construction | 2016 |
| Rognerud AS | Agriculture & fishing | 2005 |
| Romasbygg AS | Construction | 2017 |
| Romnes Hønefoss AS | Wholesale & retail | 1972 |
| Rond Invest AS | Real estate | 1997 |
| Rosenhoff Eiendom AS | Administrative & support | 2010 |
| Roy Mosengen AS | Construction | 2018 |
| Royal Hair Studio AS | Other services | 2026 |
| RPC AS | Professional & scientific | 2025 |
| RS Rør AS | Construction | 2016 |
| Rsab Holding AS | | 2025 |
| Rsst AS | Administrative & support | 2022 |
| RTM Eiendom AS | Real estate | 1996 |
| Ruben Sandanbråten Holding AS | | 2022 |
| Ruden Bil AS | Wholesale & retail | 2016 |
| Rudolf Dahl AS | Wholesale & retail | 2012 |
| Rudrud Konsulting AS | Professional & scientific | 2026 |
| Rudsbakken AS | Real estate | 2022 |
| Rundhaug Holding AS | Health & social care | 2015 |
| Rune Edvardsen AS | Construction | 2012 |
| Rune Edvardsen Holding AS | Construction | 2008 |
| Rust AS | Real estate | 2005 |
| RV 4 Eiendom AS | Real estate | 2022 |
| RV 5 Eiendom AS | Real estate | 2022 |
| Rådhusveien Eiendom Sarpsborg AS | Real estate | 2012 |
| Råholt Butikkeiendom AS | Real estate | 2011 |
| Røgeberg Drift AS | Health & social care | 2026 |
| Røgeberg Eiendom Ans | Real estate | 1990 |
| Røgeberg Holding AS | Wholesale & retail | 2005 |
| Røgeberg Ikt AS | Information & communication | 2025 |
| Røgeberg Invest AS | | 2026 |
| Røgeberg Maskin AS | Wholesale & retail | 1987 |
| Rønsdal Eiendom AS | Real estate | 2008 |
| Rønsdal Eiendom Brusetsvingen AS | Real estate | 2019 |
| Rørgården Hønefoss AS | Real estate | 2010 |
| Rørvik Blomster AS | Wholesale & retail | 2015 |
| Røsholt Maskin Avd. Hønefoss AS | Manufacturing | 2025 |
| Røste Automasjon AS | Professional & scientific | 2022 |
| Røyse Bærpresseri AS | Manufacturing | 2019 |
| Røysi Invest AS | Real estate | 2005 |
| S.S.Eiendom AS | Real estate | 2024 |
| S.Torv 8 AS | Real estate | 2005 |
| Saferoad B. Berntsen AS | Manufacturing | 1940 |
| Safetube Evac AS | Professional & scientific | 2026 |
| Saga Consult AS | Professional & scientific | 2006 |
| Saga Green Invest AS | | 2023 |
| Saga Kapital AS | Professional & scientific | 2013 |
| Saga KL AS | Professional & scientific | 2013 |
| Saga Næringsbygg AS | Real estate | 2021 |
| Saga Service AS | Construction | 2021 |
| Saga Services Holding AS | Professional & scientific | 2003 |
| Salah Servering AS | Hospitality | 2017 |
| Salong Shabana AS | Other services | 2013 |
| Salt & Pepper Eiendom AS | Real estate | 2019 |
| Salt & Pepper Holding AS | Hospitality | 2004 |
| Salt & Pepper Hønefoss AS | Hospitality | 2019 |