| Høne Pøne Gardsutsalg AS | Wholesale & retail | 2005 |
| I.R Decor AS | Professional & scientific | 2018 |
| Imazu AS | Manufacturing | 2006 |
| Innerdal Handverk AS | Manufacturing | 2017 |
| Installasjons Gruppen AS | Information & communication | 2025 |
| Inter-Tech Maskin AS | Construction | 2022 |
| Io Eiendom AS | Real estate | 2020 |
| Ishoel AS | Construction | 2004 |
| Isholbrua Maskinlag SA | Other services | 2014 |
| Isoenergi Dovre AS | Construction | 2024 |
| Iversen & Olsen AS | Construction | 2006 |
| Jelhauin Eiendom AS | Real estate | 2007 |
| JMH AS | Real estate | 2020 |
| JSK Holding AS | Real estate | 2021 |
| Jære Alt AS | Construction | 2019 |
| K. E. Grønset AS | Health & social care | 2022 |
| K. Foss VVS AS | Construction | 2006 |
| Kam Bygg AS | Construction | 2019 |
| Karisma Media AS | Professional & scientific | 2026 |
| KCS Eiendom AS | Real estate | 2021 |
| KG Treningssenter AS | Arts & recreation | 2007 |
| KG85 Holding AS | Construction | 2023 |
| Kinnpiken AS | Real estate | 2005 |
| Kinnpiken Utvikling AS | Professional & scientific | 2010 |
| Kjetil Sandsten Fysioterapi Og Treningsveiledning AS | Health & social care | 2020 |
| Klar Eiendom AS | Real estate | 2012 |
| Klettgjerde AS | Wholesale & retail | 2025 |
| Kletthammer Holding AS | Professional & scientific | 2019 |
| Kleven Bygg Eiendom AS | Construction | 2015 |
| Kleven Bygg Holding AS | Construction | 2015 |
| Kleven Bygg Invest AS | Construction | 2015 |
| Kleven Bygg Oppdal AS | Construction | 2015 |
| Klinikkshop AS | Other services | 2000 |
| Klyv Innovasjon AS | Professional & scientific | 2012 |
| Kløv AS | Construction | 2025 |
| Koffor Holding AS | Financial services | 2023 |
| Koia AS | Real estate | 2017 |
| Koos Eiendom AS | Real estate | 2022 |
| Krambua Ans | Wholesale & retail | 1999 |
| Kramra AS | Real estate | 2007 |
| Kristian Stundal AS | Information & communication | 1986 |
| Krux AS | Professional & scientific | 2020 |
| Krøsen Invest AS | Manufacturing | 2005 |
| Kurs Og Kongresservice AS | Administrative & support | 1997 |
| Kvalito AS | Wholesale & retail | 2018 |
| Kvalito Partners AS | Wholesale & retail | 2025 |
| Kvant AS | Real estate | 2012 |
| Kvasir AS | Professional & scientific | 2024 |
| Kåsvegen 11B AS | Real estate | 2012 |
| Kåsvegen 13 AS | Real estate | 2024 |
| Kåsvegen 16 AS | Real estate | 2020 |
| Laserdesign AS | Professional & scientific | 2024 |
| Lassie AS | Real estate | 2024 |
| LCG AS | Real estate | 2006 |
| Lege Hjelp AS | Health & social care | 2020 |
| Lev Vakkert AS | Wholesale & retail | 2012 |
| Liagårdene Vannverk SA | Construction | 2023 |
| Lilleløkken Eiendom AS | Real estate | 2025 |
| Lilleløkken Holding AS | Real estate | 2025 |
| Linjerydding SA | Agriculture & fishing | 2016 |
| Living Da | Real estate | 2000 |
| Logtech AS | | 2024 |
| Lukas 12 AS | Real estate | 2015 |
| Lund Tech AS | Information & communication | 2021 |
| Lundaløkk AS | Professional & scientific | 2026 |
| Lønset Grunneierlag SA | Real estate | 1966 |
| Lønseth Holding AS | | 2026 |
| M 17 Oppdal AS | Real estate | 2014 |
| M Eide Holding AS | Financial services | 2005 |
| M44 Tynset AS | Real estate | 2020 |
| Mamo Maskin AS | Manufacturing | 2024 |
| Manuellterapeut Marit Klokset- Fysioterapi Og Treningsveiledning AS | Health & social care | 2020 |
| Maracq AS | Professional & scientific | 2018 |
| Mat På Fot AS | Hospitality | 2026 |
| MCB Endre Sande AS | Health & social care | 2015 |
| Merix AS | Professional & scientific | 2021 |
| Mesloe Eiendom AS | Real estate | 2023 |
| Mesloe Holding AS | Wholesale & retail | 2023 |
| MH DH AS | Wholesale & retail | 2024 |
| Midrock AS | Mining & quarrying | 2023 |
| Midrock Oppdal AS | Mining & quarrying | 2009 |
| Midt Norsk Takst AS | Real estate | 2025 |
| Midt-Norsk Brannvern AS | Public administration | 2022 |
| Midt-Norsk FÔR SA | Manufacturing | 1960 |
| Midtnorsk Fly Og Luftsportsenter AS | Transport & logistics | 1990 |
| Mikal Invest AS | | 2020 |
| Miljøgjenvinning Entrepenør AS | Professional & scientific | 2021 |
| Miljøgjenvinning Entreprenør Drift AS | Water & waste | 2021 |
| Mjøavegen SA | Real estate | 2024 |
| Mjøen Eiendom Holding AS | Real estate | 2018 |
| Mjøen Vatningslag SA | Water & waste | 2022 |
| Mmitv AS | Health & social care | 2024 |
| Mokro AS | Real estate | 2018 |
| Mokro Eiendom AS | Real estate | 2018 |
| Monken Custom AS | Transport & logistics | 2022 |
| Mordor Holding AS | | 2020 |
| Morgenfugl Studio AS | Professional & scientific | 2022 |
| Mostad Mekaniske AS | Manufacturing | 1988 |
| Motorhuset Oppdal AS | Other services | 1981 |
| Munna Acc AS | Wholesale & retail | 2024 |