| Redpoint AS | Education | 2018 |
| Redskapshuset AS | Real estate | 2015 |
| Reelbeats AS | Arts & recreation | 2006 |
| Regnskap Innlandet SA | Professional & scientific | 1972 |
| Reichelt Holding AS | Financial services | 2013 |
| Reisekonsulenten AS | Administrative & support | 2024 |
| Reload Your Style AS | Wholesale & retail | 2005 |
| Rena Invest AS | Real estate | 2010 |
| Rensone Ans | Administrative & support | 2024 |
| Rensone AS | Administrative & support | 2026 |
| Resident AS | Professional & scientific | 2020 |
| Restart JP AS | Professional & scientific | 2017 |
| Restaurant Mango Da | Hospitality | 2011 |
| Restco AS | Hospitality | 1984 |
| Retterås AS | | 2021 |
| Retura Glør AS | Water & waste | 2025 |
| Retusj & Logo Da | Information & communication | 2006 |
| Revmatismesykehuset AS | Health & social care | 2003 |
| RG Management AS | Professional & scientific | 2012 |
| Rhexis AS | Health & social care | 2014 |
| Rika Holdingselskap AS | Construction | 2012 |
| Rimas AS | Transport & logistics | 2024 |
| Ringerud Holding AS | Real estate | 2005 |
| Ringerud Invest AS | Real estate | 1994 |
| Ringsveen Da | | 2026 |
| Rinnavegen SA | Real estate | 1939 |
| Risheim Kiropraktorklinikk AS | Health & social care | 2022 |
| Rkmb Invest AS | Real estate | 2021 |
| RM Moe Holding AS | | 2020 |
| Ro Barnehage SA | Education | 1989 |
| Roma AS | Professional & scientific | 2012 |
| Romsås Prosjekt AS | Real estate | 2004 |
| Rondvassbu AS | Hospitality | 2011 |
| Rorgemoen Holding AS | Professional & scientific | 2022 |
| Rorom AS | Real estate | 2016 |
| Rosenlundvegen 4 AS | Real estate | 2025 |
| Rosenlundveien 6 AS | Real estate | 1994 |
| Roverud Drift Da | Agriculture & fishing | 2018 |
| RS Mesna AS | Manufacturing | 2005 |
| Rubic AS | Information & communication | 2014 |
| Ruco Eiendom AS | Real estate | 2021 |
| Rud Rørlegger AS | Construction | 2012 |
| Ruhal 350 Holding AS | | 2023 |
| Rulleskia AS | Wholesale & retail | 2026 |
| Runetek AS | Professional & scientific | 2025 |
| Rustadstuen Sport AS | Wholesale & retail | 2013 |
| Rutma AS | Financial services | 2014 |
| RWB Invest AS | Real estate | 2006 |
| Rydjord Eiendom AS | Real estate | 1988 |
| Rydjord Eiendomsdrift AS | Real estate | 2014 |
| Rylandsholm Holding AS | Financial services | 2018 |
| Ryun AS | Administrative & support | 2016 |
| Rosenlund AS | Real estate | 1977 |
| Rådgiver Bernt Refsahl AS | Professional & scientific | 1996 |
| Rørlegger Ludvigsen AS | Construction | 2024 |
| Rørlegger'N Lillehammer AS | Construction | 2000 |
| S Engh AS | Construction | 2025 |
| S&Lk Invest AS | | 2005 |
| Sabrura Strandtorget AS | Hospitality | 2022 |
| Sacculus AS | Health & social care | 2007 |
| Safarihuset AS | Wholesale & retail | 2013 |
| Saga Charter Ans | Administrative & support | 2023 |
| Sagbakken Glasservice AS | Construction | 2003 |
| Sagbakken Holding AS | Financial services | 2014 |
| Saksheim Ideer | Arts & recreation | 1983 |
| San Marino Lillehammer AS | Hospitality | 2017 |
| Sander Dokken Holding AS | | 2021 |
| Sandvoll Takst AS | Real estate | 2022 |
| Sannum AS | Manufacturing | 1992 |
| Saunesholding AS | | 2020 |
| Sax Eiendom AS | Construction | 2012 |
| SB Service AS | Construction | 2024 |
| SB73 Holding AS | | 2022 |
| SBK Eiendomsutvikling AS | Real estate | 2023 |
| Sbvm Holding AS | | 2023 |
| Scheie&Iversen AS | Wholesale & retail | 2023 |
| SD Construktion AS | Construction | 2025 |
| SD Eiendom AS | Real estate | 2022 |
| Segelstadsetertunet AS | Real estate | 2019 |
| Seielstad Service AS | Administrative & support | 2023 |
| Selven Foto AS | Professional & scientific | 2023 |
| Selvik Holding AS | | 2023 |
| Sensilist AS | Professional & scientific | 2020 |
| Sentrum Fysioterapi Og Trening AS | Health & social care | 2019 |
| Sentrum Legekontor Lillehammer Da | Health & social care | 2013 |
| Sentrum Parkering-Lillehammer AS | Transport & logistics | 1992 |
| Sentrumsgården Brumunddal AS | Real estate | 2011 |
| Servetek Norway AS | | 2025 |
| SGF AS | Construction | 2021 |
| SGF Eiendom AS | Real estate | 2023 |
| SGF Entreprenør AS | Construction | 2022 |
| Shady Business AS | Administrative & support | 2022 |
| Shan Frisør AS | Other services | 2017 |
| Shellcon AS | Professional & scientific | 2008 |
| Sic Publishing AS | Information & communication | 2024 |
| Siell AS | | 2024 |
| Sikker Jobb AS | Professional & scientific | 2014 |
| Sikt Eiendom Ans | Real estate | 1997 |
| Simas Holding AS | Administrative & support | 2010 |
| Simen Bjørstad Holding AS | Professional & scientific | 2021 |