| Polcraft Montering AS | Construction | 2025 |
| Poppy Holding AS | | 2022 |
| Powsoft AS | Information & communication | 2024 |
| Praksis Arkitekter AS | Professional & scientific | 1997 |
| Prestige Team Montering Og Bygg AS | Construction | 2023 |
| Prestvik AS | Wholesale & retail | 2023 |
| Prikk & Strek AS | Wholesale & retail | 1989 |
| Prikken AS | Administrative & support | 1999 |
| Prikken Eiendom AS | Administrative & support | 1998 |
| Prios Kompetanse AS | Education | 2016 |
| Produktpartner AS | Professional & scientific | 2020 |
| Prosjekt X AS | Real estate | 2026 |
| PSYKOLOGPARTNER1 AS | Health & social care | 2022 |
| Pure Minerals AS | Administrative & support | 2021 |
| Quality Hotel Grand Steinkjer AS | Hospitality | 1988 |
| Quick Feedback Systems AS | Information & communication | 2006 |
| R-S Invest AS | Real estate | 2014 |
| R.N.O. Venture AS | Professional & scientific | 1987 |
| Raade, Setten Og Midjo Grunneierlag SA | Agriculture & fishing | 1971 |
| Raffina AS | Wholesale & retail | 2021 |
| Ragnhildvegen 32 AS | Real estate | 2025 |
| Rak Eiendom AS | | 2018 |
| Ramberg Utbygging AS | | 2022 |
| Rapp Invest Og Utleie AS | | 2023 |
| Rator 327 Holding AS | | 2023 |
| Raudfjell Vind AS | Energy | 2005 |
| Ravlo Skog AS | Agriculture & fishing | 2019 |
| Reistad Maskin AS | Construction | 2022 |
| Reistad Mur Og Flis AS | Construction | 2023 |
| Reitanfeltet Samdrift Da | Agriculture & fishing | 1999 |
| Renå Maskindrift Da | Agriculture & fishing | 2006 |
| Resyme Vest AS | Administrative & support | 1995 |
| Revisjon Midt-Norge SA | Professional & scientific | 2017 |
| Rg-Holding AS | Professional & scientific | 1987 |
| Ringseth Eiendom AS | Real estate | 2010 |
| Rishalla Utbygging AS | Real estate | 2010 |
| Roadteknikk AS | Wholesale & retail | 2005 |
| Rocklove AS | Professional & scientific | 2009 |
| Rodium AS | Financial services | 2005 |
| Roel Produkter AS | Manufacturing | 2015 |
| Roel Produkter Holding AS | Manufacturing | 2015 |
| Roger Heggli AS | Transport & logistics | 2020 |
| Rosan Tech AS | Transport & logistics | 2019 |
| Roundabout AS | Other services | 2014 |
| Rozi Taxi AS | Transport & logistics | 2025 |
| Rubbedalshøgda Vindkraftverk AS | Professional & scientific | 2024 |
| Rubus Holding AS | | 2022 |
| Rune Bjørnes AS | Real estate | 2010 |
| Ryan Holding AS | Professional & scientific | 2013 |
| Ryethm AS | Wholesale & retail | 2026 |
| Røli Holding AS | | 2022 |
| Røli Multiservice AS | Other services | 2020 |
| Rør Og Varme AS | Construction | 2025 |
| Rørleggermester Bernt Skatland AS | Construction | 1989 |
| Rørvik Hydrogen Hub AS | Professional & scientific | 2022 |
| Røysing Barnehage SA | Education | 1990 |
| Rør Tek A/S | Construction | 1988 |
| S. M. Johnsen Holding AS | | 2020 |
| S.Larsen Holding AS | | 2021 |
| Sabrura Steinkjer AS | Hospitality | 2019 |
| Saga FT AS | Arts & recreation | 2016 |
| Saga Medica AS | Health & social care | 2010 |
| Sagamat AS | Manufacturing | 1998 |
| Sagmestervegen 2B AS | Real estate | 2018 |
| Sahin AS | Hospitality | 2010 |
| Sakshaug Eiendom AS | Professional & scientific | 2002 |
| Sakshaug Sport AS | Wholesale & retail | 1986 |
| Sakshaug Sport Holding AS | Wholesale & retail | 2006 |
| Salberg Holding AS | Information & communication | 2013 |
| Saltho AS | Real estate | 2013 |
| Samtaleterapi AS | Health & social care | 2024 |
| Sandeltre AS | | 2020 |
| Sandseter Bygg AS | Construction | 2019 |
| Sannan Bensin Og Service AS | Wholesale & retail | 2000 |
| Sannan Bil AS | Other services | 2006 |
| Sannan Legesenter AS | Health & social care | 2015 |
| Sannangata 3 AS | Real estate | 2019 |
| Sarens AS | Mining & quarrying | 2007 |
| Sarepta Energi AS | Energy | 2005 |
| Saur AS | Wholesale & retail | 2021 |
| Saur Maskin Og Drift AS | Transport & logistics | 2025 |
| Savi Tech AS | Information & communication | 2026 |
| Savko AS | Construction | 2011 |
| Saxvik Holding AS | Wholesale & retail | 2024 |
| Saxvik Kontorsenter AS | Wholesale & retail | 2016 |
| Saxvik Prosjekt AS | Wholesale & retail | 2021 |
| SB Korn Da | Agriculture & fishing | 2013 |
| SB Taraldsen Holding AS | Wholesale & retail | 2009 |
| SB Utvikling AS | Professional & scientific | 2013 |
| Sb-Rones SA | Agriculture & fishing | 2010 |
| SBB Eiendom AS | Real estate | 2023 |
| SBF Dekk & Felg AS | Wholesale & retail | 2014 |
| Scandinavian Transformer Group AS | Real estate | 2007 |
| Sceneteknikk AS | Arts & recreation | 2014 |
| Seil & Damp Da | Arts & recreation | 2005 |
| Seilmakergata 1 Steinkjer AS | Real estate | 2023 |
| Seilmakergata 2 AS | Real estate | 1987 |
| Sektor Bygg AS | Real estate | 2018 |
| Sentrum Lakkering AS | Real estate | 2005 |
| Sentrum Mat AS | Wholesale & retail | 1993 |