| Galåvolden AS | Professional & scientific | 2013 |
| Galåvolden Gård AS | Manufacturing | 2013 |
| Gjettjønna Eiendom AS | Real estate | 2017 |
| Gjøsvika AS | Real estate | 2013 |
| Gjøsvikmoen AS | Real estate | 2013 |
| Glad & Glad AB Nuf | Health & social care | 2025 |
| Glåmos Mineralvann AS | Manufacturing | 2005 |
| Glød Frisør Røros AS | Other services | 1987 |
| Godtfolk AS | Professional & scientific | 2009 |
| Graf Music AS | | 2025 |
| Granterjo AS | Real estate | 2005 |
| Grasholmen 6C AS | Real estate | 2022 |
| Grytbak Eiendom AS | Real estate | 2022 |
| Grytbak Holding AS | Real estate | 2022 |
| Grønmyr Eiendom AS | Real estate | 2006 |
| Grønmyr Gruppen AS | Real estate | 2015 |
| Guha Holding AS | | 2020 |
| Gullikstad Maskin AS | Construction | 2020 |
| H a Sjøvold AS | Wholesale & retail | 1984 |
| Haltdalencatring AS | Hospitality | 2025 |
| Hamrins Maleri Ans | Arts & recreation | 1998 |
| Hanne Bryde Invest AS | Education | 2021 |
| Harbac AS | Information & communication | 2023 |
| Heggem & Klykken AS | Manufacturing | 2017 |
| Heggem Holding AS | | 2019 |
| Hel Ved Bygg AS | Construction | 2021 |
| Hel Ved Eiendom AS | Real estate | 2021 |
| Her Big Break AS | Education | 2021 |
| Hioh AS | | 2022 |
| Hitterdal Vannverk Ba | Water & waste | 1996 |
| Hjellnes Tidemann AS | Wholesale & retail | 2010 |
| Hulabaloo Eiendom AS | Real estate | 2025 |
| Hulabaloo Opp & Frem AS | Professional & scientific | 2018 |
| Husfliden AS | Wholesale & retail | 2003 |
| Hånesrabben AS | | 2026 |
| Idrettsparken Eiendom AS | Hospitality | 1994 |
| Idéhus Røros AS | Construction | 2001 |
| Ingeniørbygg AS | Construction | 2020 |
| Ingeniørfirmaet Myran AS | Construction | 2020 |
| Intersport Røros AS | Wholesale & retail | 1989 |
| Investorium AS | Real estate | 2010 |
| Jan Tamnes Holding AS | | 2026 |
| JFS Holding AS | | 2017 |
| Johan Kjellmark Holding AS | Real estate | 2017 |
| Jolithse AS | | 2022 |
| Jordbærpikene Røros AS | Hospitality | 2022 |
| JWP AS | Health & social care | 1986 |
| K-Betong Røros AS | Manufacturing | 2025 |
| Kiropraktorklinikken - Bevegelse I Sentrum AS | Health & social care | 2009 |
| Kjellmark AS | Construction | 2021 |
| Kjellmark Eiendom AS | Real estate | 2023 |
| Kjellmark Eiendomsutvikling AS | Real estate | 2014 |
| Kjellmarkgruppen AS | Construction | 2023 |
| Kjelsvollen Gård Ans | Agriculture & fishing | 2017 |
| Kjerkgata 15 AS | Real estate | 2002 |
| Kjerkgata 6 AS | Real estate | 2022 |
| KK Eiendom Da | Real estate | 2007 |
| Kobberklang AS | Hospitality | 2025 |
| Kohtla Infinitix Fiber AS | | 2026 |
| Kommunike AS | Professional & scientific | 1997 |
| Kristiansen Takst AS | Professional & scientific | 2025 |
| Kristoffer Näs AS | Construction | 2017 |
| Krog Eiendom AS | Real estate | 1991 |
| Kunst Og Kaos AS | Wholesale & retail | 2013 |
| Kvadrat Service AS | Real estate | 2026 |
| Kvaks Corporate AS | Professional & scientific | 2012 |
| Kvarts Eiendom AS | Real estate | 2023 |
| Kvarts Holding AS | Manufacturing | 1968 |
| Landbrukstjenester Gauldal Og Røros SA | Agriculture & fishing | 1995 |
| Langen Gjestegård AS | Hospitality | 2003 |
| Langen Holding AS | Real estate | 2005 |
| Langen Invest AS | Real estate | 2017 |
| Lavvo.Net AS | Administrative & support | 2005 |
| Leselusa AS | Arts & recreation | 2019 |
| Levo Holding AS | | 2025 |
| LJH Holding AS | Real estate | 2005 |
| LPW Holding AS | | 2020 |
| Lykkens Portal AS | Wholesale & retail | 2012 |
| Lysstråle AS | Wholesale & retail | 2012 |
| Mab Eiendom AS | Real estate | 2022 |
| Magidas Holding AS | Real estate | 2012 |
| Mahama AS | Real estate | 1996 |
| Maktens Korridorer AS | Professional & scientific | 2017 |
| Markering AS | Information & communication | 2023 |
| Matråd AS | Professional & scientific | 2011 |
| Mgu 010 Holding AS | | 2023 |
| Mi Tangkh AS | Hospitality | 2023 |
| Mm-Bygg AS | Construction | 2025 |
| Moen Fotterapeut AS | Health & social care | 2025 |
| Mye Rart Røros AS | Wholesale & retail | 2018 |
| Nedre Flanderborg 3 AS | Real estate | 2025 |
| Nilsenhjørnet Eiendomselskab AS | Real estate | 2006 |
| Njøtøy AS | Construction | 2021 |
| Norsk Saunasenter AS | Wholesale & retail | 2024 |
| Nye Røffe AS | Wholesale & retail | 2015 |
| Nye Røros Sport AS | Wholesale & retail | 2019 |
| Nymoen Maskin AS | Agriculture & fishing | 2015 |
| Nødslaktservice AS | Transport & logistics | 2025 |
| Oddvar Tamnes Maskin & Transport AS | Transport & logistics | 1996 |
| Oliver Travel AS | Administrative & support | 2009 |