| Aalen AS | Manufacturing | 2020 |
| Annar Dragmyrhaug Holding AS | | 2026 |
| Bahb AS | | 2024 |
| Bergstaden Bygg AS | Construction | 2012 |
| Bergstaden VVS AS | Construction | 2018 |
| Bjørgåsen Fellesseter | Agriculture & fishing | 1969 |
| Brasko Invest AS | Real estate | 2015 |
| Bravo Management AS | Professional & scientific | 2013 |
| Byggsafe AS | Professional & scientific | 2020 |
| Da Kværnes Scooterrekvisita | Wholesale & retail | 1986 |
| Den Glade Fuglehund AS | Other services | 2022 |
| DS Utvikling AS | Real estate | 2021 |
| E1 Drift AS | Wholesale & retail | 2018 |
| Eggavegen 1 AS | Real estate | 2016 |
| Elite Akademiet AS | Education | 2023 |
| Engan Da | Agriculture & fishing | 2009 |
| Engesvolden Hyttegrend SA | Other services | 2003 |
| Falunveien 1 AS | | 2005 |
| Famco Investor AS | Real estate | 2005 |
| Findland Trevare AS | Manufacturing | 2001 |
| Fjell Bua AS | Hospitality | 2025 |
| Fjell Caravan AS | Other services | 2026 |
| Fjell Drift AS | Administrative & support | 2021 |
| Fjell Hjelp AS | Wholesale & retail | 2023 |
| Fjell Maskin AS | Construction | 2026 |
| Fjell Mat AS | Manufacturing | 2025 |
| Fjell Regnskap AS | Professional & scientific | 2024 |
| Fjellby AS | Professional & scientific | 2014 |
| Fjellstyrene I Holtålen SA | Agriculture & fishing | 2017 |
| Flatåsen Invest AS | Real estate | 2006 |
| Formo Samdrift Da | Agriculture & fishing | 1982 |
| Gne Drift AS | Real estate | 2026 |
| Hessdalen Bygdeservice SA | Administrative & support | 1994 |
| Hessdalen Nordre Storviltlag SA | Real estate | 2005 |
| Hessdalen Utvikling AS | Real estate | 2025 |
| Hessdalen Vassverk SA | Water & waste | 1976 |
| Hessjøgruva AS | Mining & quarrying | 2011 |
| Hia AS | Construction | 2020 |
| Holden & Hitterdal Service AS | Wholesale & retail | 1994 |
| Holden Adventures AS | Wholesale & retail | 2008 |
| Holtålen Taxi AS | Transport & logistics | 2012 |
| Høsttrøa Samdrift Da | Agriculture & fishing | 2011 |
| Ilhaugvegen 8 AS | Real estate | 2019 |
| J Tronsaune El Installasjon AS | Construction | 2001 |
| Jenssen Elektro AS | Professional & scientific | 2007 |
| Jkelb Holding AS | Financial services | 2010 |
| Kjempeplassen AS | Real estate | 2023 |
| Kle Nåva Ans | Wholesale & retail | 1999 |
| Knubben Eiendom AS | Real estate | 1989 |
| Kokko AS | Information & communication | 2023 |
| Kråa AS | Education | 2012 |
| Kyllingen Maskinlag SA | Agriculture & fishing | 2020 |
| Kåre Ovesen Invest AS | Professional & scientific | 2007 |
| Living Røros AS | Hospitality | 2025 |
| Meg Holding AS | Manufacturing | 2005 |
| Meta AS | Manufacturing | 1991 |
| Norbox AS | Wholesale & retail | 2015 |
| Nåva Treningsstudio SA | Arts & recreation | 2006 |
| Ole P. Bakken AS | Construction | 1975 |
| Protex AS | Manufacturing | 1974 |
| Roro Holding AS | Professional & scientific | 2008 |
| Rønningen Bio AS | Energy | 2021 |
| Rønningen Eiendomsselskap AS | Real estate | 2021 |
| Røros Bud Og Transport AS | Transport & logistics | 2000 |
| Røros Elektro AS | Construction | 2005 |
| Saksvollen AS | Agriculture & fishing | 2024 |
| Sie Gubba Ans | Arts & recreation | 2000 |
| Skjertuva Frisør AS | Other services | 2020 |
| Skogås Holding AS | Arts & recreation | 2024 |
| Skogås Transport AS | Transport & logistics | 2008 |
| Skovika Invest AS | | 2021 |
| Skøi AS | Arts & recreation | 2025 |
| Snøhetta Logistic AS | Transport & logistics | 2016 |
| Sollie Bygg AS | Construction | 2002 |
| Synåla AS | Manufacturing | 2016 |
| Tong J Norway AS | Wholesale & retail | 2021 |
| Truckparts Trading AS | Wholesale & retail | 2014 |
| Vikern Holding AS | Real estate | 2015 |
| Visithessdalen AS | Hospitality | 2012 |
| Vrakpant Da | Arts & recreation | 2025 |
| Vårvik Eiendom AS | Real estate | 2020 |
| Ålen Aktivum AS | Arts & recreation | 2015 |
| Ålen Bilservice AS | Other services | 2016 |
| Ålen Hyttegrend Ba | Real estate | 1999 |
| Ålen Invest AS | Real estate | 2012 |
| Ålen Vassverk SA | Water & waste | 1965 |
| Ålen Vegstasjon Asbjørn Eidet AS | Construction | 2013 |
| Østsida Utmarkslag SA | Arts & recreation | 1991 |