| Lise Yoga AS | Education | 2016 |
| Lisny Holding AS | | 2023 |
| Livsveien AS | Health & social care | 2022 |
| LLT Holding AS | | 2021 |
| Lmep AS | | 2023 |
| Logoped Rita Helen Kleivhaug AS | Health & social care | 2023 |
| Lokaln AS | Hospitality | 2012 |
| Lumira Holding AS | Real estate | 2021 |
| Lyngengården Eiendom AS | Real estate | 2023 |
| M Moss Holding AS | | 2016 |
| Madam Mim Holding AS | | 2025 |
| Magne Og Tore Opland Da | Agriculture & fishing | 1995 |
| Magne Opland AS | Construction | 1996 |
| Mainflow AS | Information & communication | 2021 |
| Malerbua AS | Wholesale & retail | 1985 |
| Malix Frisørsalong AS | Other services | 1993 |
| Marianne Fjellheim AS | | 2025 |
| Marita Fjellheim AS | | 2025 |
| Marius Fjellheim Invest AS | | 2026 |
| Martha Og Øivind Musikktjenester Ans | Arts & recreation | 2001 |
| Martom AS | Construction | 2016 |
| Martom Eiendom AS | Real estate | 2015 |
| Maskinentreprenør Christer Jakobsen AS | Construction | 2017 |
| Mathias Bruns Gate 3 AS | Real estate | 2019 |
| Mathias Brunsgt. 17 AS | Real estate | 2010 |
| Mathias Åkervik AS | Construction | 2019 |
| Mattismoen Eiendom AS | Real estate | 1996 |
| May's Salong AS | Other services | 2017 |
| MB Pro AS | Professional & scientific | 2020 |
| Mcneil Bemanner AS | Administrative & support | 2020 |
| Mediehuset Helgelendingen AS | Information & communication | 1990 |
| Meliora Invest AS | | 2020 |
| Merkelig AS | | 2022 |
| Metanoeo AS | Health & social care | 2024 |
| MG Bil AS | Construction | 2009 |
| Midt Norge Dental AS | Manufacturing | 1997 |
| Midt Norsk Bemanning AS | Administrative & support | 1994 |
| Midt Norsk Betong Mosjøen AS | Manufacturing | 2012 |
| Midt Norsk Eiendom AS | Manufacturing | 2011 |
| Midt Norsk Holding AS | Real estate | 1989 |
| Midt Norsk Industri Consult AS | Real estate | 1989 |
| Midtnor AS | Professional & scientific | 2016 |
| Midtnor Regnskap AS | Professional & scientific | 2021 |
| Mkaf Fagertun Barnehage AS | Education | 2022 |
| MKB Eiendom AS | Real estate | 2011 |
| MKB Verksted AS | Manufacturing | 2018 |
| MMM Eiendom AS | Real estate | 2003 |
| MNB Holding AS | Real estate | 2012 |
| Mogens Invest AS | Professional & scientific | 2015 |
| Mogården AS | Real estate | 2023 |
| Mokin AS | | 2021 |
| Moldrem Maskin AS | Construction | 2020 |
| Moldremma Vannverk SA | Water & waste | 2013 |
| Monica Dahle Holding AS | | 2026 |
| Mosjøbasen Da | Information & communication | 1999 |
| Mosjøen Anlegg & Utleie AS | Administrative & support | 2012 |
| Mosjøen Begravelsesbyrå AS | Other services | 2004 |
| Mosjøen Bil Og Maskindemontering AS | Wholesale & retail | 1994 |
| Mosjøen Bokhandel AS | Wholesale & retail | 1997 |
| Mosjøen Bygg AS | Construction | 2004 |
| Mosjøen Dyreklinikk AS | Professional & scientific | 2021 |
| Mosjøen Eiendoms Companie AS | Real estate | 2005 |
| Mosjøen Forsikringssenter AS | | 2026 |
| Mosjøen Forsikringssenter AS | Financial services | 2001 |
| Mosjøen Fus Barnehage AS | Education | 2018 |
| Mosjøen Helsekostsenter AS | Wholesale & retail | 2001 |
| Mosjøen Hotell AS | Hospitality | 2003 |
| Mosjøen Industriterminal AS | Transport & logistics | 2007 |
| Mosjøen Kantinedrift AS | Hospitality | 2002 |
| Mosjøen Kjøl & Frys Da | Transport & logistics | 2005 |
| Mosjøen Kulde Og Klima Service AS | Manufacturing | 1996 |
| Mosjøen Legesenter AS | Health & social care | 2016 |
| Mosjøen Malerservice AS | Construction | 2002 |
| Mosjøen Multiservice AS | Manufacturing | 2019 |
| Mosjøen Næringseiendom AS | Real estate | 1997 |
| Mosjøen Rørleggerservice AS | Construction | 2024 |
| Mosjøen Servicenter AS | Wholesale & retail | 2025 |
| Mosjøen Skotøymagasin AS | Wholesale & retail | 2006 |
| Mosjøen Sky Invest AS | | 2019 |
| Mosjøen Specsavers AS | Wholesale & retail | 2020 |
| Mosjøen Taxisentral SA | Transport & logistics | 1997 |
| Mosjøen Transport AS | Transport & logistics | 2014 |
| Mosjøen Vask & Rens AS | Other services | 2001 |
| Moto Musikkskole AS | Education | 2021 |
| Moto Prosjekt AS | Professional & scientific | 1993 |
| Motorsykkelhuset Ans | Wholesale & retail | 1996 |
| Mtme AS | Real estate | 2024 |
| Murmester Mortensen AS | Administrative & support | 2024 |
| MVP Konstruksjon AS | Construction | 2016 |
| Myrnes Traktor & Maskin AS | Manufacturing | 2020 |
| Møller Musikk AS | Wholesale & retail | 2010 |
| Møllevik Maskin AS | Agriculture & fishing | 2021 |
| Naust Band SA | Arts & recreation | 2025 |
| Naustgata 3 AS | Real estate | 2019 |
| Nersund Holding AS | | 2025 |
| Nervollan Eiendom AS | Real estate | 2005 |
| Nettsam AS | Information & communication | 2018 |
| Nicolas AS | Real estate | 2001 |
| Nielsen Holding AS | | 2025 |
| Nikcosønn Ans | Other services | 1992 |