| Ramstinden AS | | 2026 |
| Rasch Eiendom AS | Real estate | 2006 |
| Readplay AS | Information & communication | 2024 |
| Real Trening AS | Arts & recreation | 2023 |
| Regamo AS | Real estate | 2013 |
| Regamo Eiendom AS | Real estate | 2018 |
| Region Invest AS | Real estate | 2014 |
| Reinsnes Holding AS | Construction | 2018 |
| RENHOLDER1 AS | Construction | 2023 |
| Resoil AS | Water & waste | 2025 |
| Rett Fram AS | Transport & logistics | 2006 |
| Reverud AS | Information & communication | 2014 |
| Riise Aas AS | Professional & scientific | 2015 |
| Risolve AS | Professional & scientific | 2011 |
| Risolve Norge AS | Professional & scientific | 2015 |
| Ritha's Fotterapi AS | Health & social care | 2018 |
| Ritzo AS | Professional & scientific | 2015 |
| Rolf Storsveen AS | Professional & scientific | 2023 |
| Rollo Tobak & Frukt Ans | Wholesale & retail | 1999 |
| Ropeders Invest AS | Professional & scientific | 2017 |
| Rosen Eiendom AS | Wholesale & retail | 1997 |
| Rov Og Miljø AS | Administrative & support | 2020 |
| RS Mekaniske Verksted AS | Other services | 2019 |
| Rujo Holding AS | | 2020 |
| Rula Holding AS | Professional & scientific | 2014 |
| Rustad Drikker AS | Manufacturing | 2016 |
| Rustad Eiendom Holding AS | Real estate | 2017 |
| Rustad Østmoe AS | Real estate | 2013 |
| Rypeveien 16 AS | Real estate | 2020 |
| Røhne Eiendom AS | Real estate | 1998 |
| Røinaas Invest AS | | 2019 |
| S.C Holding AS | | 2026 |
| Sabrura Elverum AS | Hospitality | 2026 |
| Sagtjernet Panorama AS | Real estate | 2026 |
| Saidhodzha AS | Hospitality | 2025 |
| Salone 28 AS | Other services | 2023 |
| Samfunnshuset Langenga SA | Real estate | 1995 |
| Sammen for Elverum AS | Arts & recreation | 2020 |
| San Marino Elverum AS | Hospitality | 2004 |
| Sanzi AS | Wholesale & retail | 2021 |
| Sape A/S | Other services | 1987 |
| Sash Holding AS | | 2025 |
| Savest AS | Information & communication | 2023 |
| SB Skog AS | Agriculture & fishing | 1996 |
| Scandinavian Fibre Board AS | Manufacturing | 2015 |
| Scandinavian Forest Group AS | Wholesale & retail | 2000 |
| Scansec Consulting AS | Information & communication | 2025 |
| Schulstadsveen AS | Wholesale & retail | 2014 |
| Schulstadsveen Holding AS | Wholesale & retail | 2014 |
| Schulstadsveen Maskindrift AS | Construction | 2015 |
| Se.Eiendom AS | Real estate | 2016 |
| Seljevegen 10 Og 12 AS | Real estate | 2021 |
| Seljevegen 18 AS | Real estate | 2021 |
| Selma Blikkenslagerverksted AS | Construction | 2005 |
| Sentralverkstedet AS | Other services | 1980 |
| Sentrum Bilpleie Elverum AS | Other services | 2024 |
| Sentrum Din Fastlege AS | Health & social care | 2021 |
| Sentrum Park Eiendom AS | Real estate | 2016 |
| Serviceteknikk Innlandet AS | Manufacturing | 2025 |
| SG Elektro AS | Construction | 2017 |
| SG Elektro AS | Construction | 2021 |
| Sharma's Estate AS | | 2025 |
| Sharmas Indiske Restaurant AS | Hospitality | 2020 |
| Shirin's Hårstudio AS | Other services | 2026 |
| Sib Eiendom AS | Real estate | 2022 |
| Sig Invest AS | | 2020 |
| Sigelle Holding AS | Financial services | 2012 |
| Signe Eriksen Helse AS | Health & social care | 2007 |
| Sik Drift AS | Construction | 2023 |
| Silkeborgh AS | Wholesale & retail | 1980 |
| Silkoset Bygg AS | Construction | 2001 |
| Silvi Forum AS | Wholesale & retail | 1995 |
| Sima Verdi AS | Real estate | 2021 |
| Simracing AS | Wholesale & retail | 2021 |
| Sivilingeniør Owrenn AS | Professional & scientific | 1975 |
| Sjøl Invest AS | Financial services | 2015 |
| SK Holding 1 AS | Arts & recreation | 2025 |
| SK Hunt AS | Arts & recreation | 2025 |
| Skansen Eiendomsutvikling AS | Real estate | 2017 |
| Skavern Holding AS | | 2025 |
| Skavern Konsult AS | Professional & scientific | 2025 |
| Skirbekk Invest AS | Administrative & support | 2014 |
| Skjærbekk Holding AS | Manufacturing | 2017 |
| Skjærbekk Sveis Og Montasje AS | Manufacturing | 2017 |
| Skjærbæk Skog Og Flis AS | Agriculture & fishing | 2010 |
| Skog Og Hyttesenter AS | Wholesale & retail | 2019 |
| Skogforvaltning AS | Agriculture & fishing | 2026 |
| SL Tak Nuf | Construction | 2021 |
| Slatlem Elverum AS | Wholesale & retail | 2021 |
| Sletten Takst AS | Real estate | 2020 |
| Slugulia Hyttelag AS | Real estate | 2001 |
| Slåttmyrbakken Eiendom AS | Real estate | 2012 |
| Smart Eiendom 1 AS | Real estate | 2019 |
| Smart Invest AS | Real estate | 2012 |
| Smart IT AS | Information & communication | 2012 |
| Smart Oppussing Elverum AS | Construction | 2019 |
| Smart-Invest AS | | 2011 |
| Smash That AS | Hospitality | 2025 |
| Smedstad Eiendom AS | Financial services | 1966 |
| Snekkeriet AS | Manufacturing | 2021 |