| Arho Consulting AS | Professional & scientific | 2016 |
| Arkitekt Olaf Røe AS | Professional & scientific | 2024 |
| Arnfinn Bakken AS | Financial services | 2017 |
| Aurora Arctic Seafood AS | Wholesale & retail | 2025 |
| Blåtimen Produksjon AS | Information & communication | 2022 |
| Brannportal AS | Education | 2022 |
| Brattåsen Diesel Og Beredskapslager SA | Wholesale & retail | 1991 |
| Brutippen AS | Wholesale & retail | 2021 |
| Brødrene Langøien Anlegg AS | Construction | 2014 |
| Bækken AS | | 2023 |
| C H Børjessons Byggnadsvård | Arts & recreation | 2000 |
| Copper City Holding AS | Real estate | 2017 |
| Dalsbygda Friskole AS | Education | 2021 |
| Dalsbygda Graveservice Ans | Construction | 2005 |
| Dalsbygda Samfunnshus SA | Real estate | 1959 |
| Dalsbygda Serviceselskap AS | Construction | 2016 |
| Elisabeth Heidtmann Holding AS | Financial services | 2005 |
| Erland Høistad AS | Manufacturing | 2013 |
| Fcon AS | Professional & scientific | 2015 |
| Feie AS | Real estate | 2026 |
| Fjellfølge Da | Administrative & support | 2005 |
| Fnor AS | Professional & scientific | 2005 |
| Galåen Grus AS | Mining & quarrying | 2014 |
| Gamle Samvirke Ans | Real estate | 2001 |
| Geir Lundh AS | Professional & scientific | 2023 |
| Grov & Meli AS | Agriculture & fishing | 2024 |
| Heliks AS | Information & communication | 2015 |
| HR Entreprenør AS | Construction | 2015 |
| HSW Bygg AS | Construction | 2017 |
| Humla Holding AS | | 2022 |
| Hummel Bygg AS | Professional & scientific | 2025 |
| Hummelfjell Drift AS | Arts & recreation | 2022 |
| Hummelfjell Eiendom AS | Real estate | 2010 |
| Hummelfjell Hytteservice Da | Administrative & support | 2005 |
| Hummelfjell Snøproduksjon AS | Energy | 2010 |
| Hummelfjell Varmestuggu Ans Ryen Og Evensen | | 1990 |
| Høisen Holding AS | | 2021 |
| Høistad Drift Ans | Agriculture & fishing | 2022 |
| Høistad Hansen Da | Manufacturing | 1997 |
| India Trading Nordic AS | Professional & scientific | 2016 |
| Invang AS | Real estate | 2013 |
| Itn Cobo Advisors AS | Professional & scientific | 2024 |
| Jensvold AS | Transport & logistics | 2025 |
| Johnsen Karsk & Kløpperi AS | Other services | 2024 |
| Kaffi AS | Manufacturing | 2019 |
| Kalvkroken Boligutvikling AS | Real estate | 2019 |
| Kian Holding AS | | 2026 |
| Killnoise AS | Wholesale & retail | 2014 |
| Langhagaveien SA | Real estate | 1990 |
| Langøien Grus & Transport AS | Mining & quarrying | 1975 |
| Langøigjelten Ans | Agriculture & fishing | 2006 |
| Ligård Holding AS | Real estate | 2005 |
| Liy Holding AS | | 2017 |
| Lny Holding AS | Wholesale & retail | 2024 |
| M Häggblom AS | Hospitality | 2017 |
| Mekanor AS | Manufacturing | 1992 |
| Mellomrommet Da | Wholesale & retail | 1999 |
| Moseng Gård AS | Wholesale & retail | 2000 |
| Mosengtrøa AS | Real estate | 2007 |
| Narbuvoll Grunneierlag SA | Arts & recreation | 1980 |
| Njord Energi Holding AS | Construction | 2022 |
| Njord Vannkraft AS | Construction | 2021 |
| Nord-Østerdal Miljøpark AS | Real estate | 2022 |
| Nordic Ascent AS | Professional & scientific | 2025 |
| Norshield AS | Wholesale & retail | 1993 |
| Ny Start Da | Health & social care | 2003 |
| Nye Farger AS | Construction | 2014 |
| Nye Samvirke AS | Real estate | 2005 |
| NYMO1 Holding AS | | 2023 |
| Nøra Grunneierlag SA | Arts & recreation | 2003 |
| Nøra Østre Grunneierlag SA | Real estate | 1981 |
| Offo AS | Professional & scientific | 2011 |
| Opheim Utvikling A/S | Wholesale & retail | 2016 |
| Os Blomster AS | Wholesale & retail | 2022 |
| Os Bygdeservice SA | Administrative & support | 2005 |
| Os Byggservice AS | Construction | 2000 |
| Os Dekk AS | Wholesale & retail | 2025 |
| Os Eiendomsutvikling AS | Real estate | 2016 |
| Os Entreprenør AS | Construction | 2004 |
| Os Entreprenør Eiendom AS | Real estate | 2006 |
| Os Frisør AS | Other services | 2013 |
| Os Id AS | Manufacturing | 1981 |
| Os Løypemaskin SA | Agriculture & fishing | 2001 |
| Os Meieri SA | Wholesale & retail | 1991 |
| Os Næringsbygg AS | Real estate | 1993 |
| Os Samfunnshus SA | Real estate | 1965 |
| Os Sauhamnelag SA | Agriculture & fishing | 1977 |
| Os Trekultur AS | Manufacturing | 2002 |
| Os Vannanlegg SA | Water & waste | 1972 |
| Os-Erlia Elvelag SA | Other services | 1970 |
| Os/Elvelia Grunneierlag SA | Real estate | 2004 |
| Osgarden Biovarme AS | Energy | 2012 |
| Oshaug Holding AS | | 2023 |
| Ot Eiendom AS | Real estate | 1990 |
| PMR AS | Real estate | 2011 |
| Ramlos AS | Construction | 1978 |
| Red Anvil Media AS | Information & communication | 2019 |
| RS Maskin Og Service AS | Construction | 2021 |
| Røros Solfilm Og Tuningservice AS | Other services | 2026 |
| Røroskjøtt AS | Manufacturing | 2003 |