| Løvstadvegen 7 AS | Real estate | 2019 |
| M & T Andersen AS | Wholesale & retail | 1979 |
| M Prosjekt AS | Professional & scientific | 2013 |
| M-O-H145 Limited Nuf | Wholesale & retail | 2011 |
| M. Stenberg AS | Financial services | 2015 |
| M3 Capital AS | | 2025 |
| M3ISTER Holding AS | Health & social care | 2020 |
| Ma Engen Holding AS | | 2024 |
| Mace Marketing Da | Professional & scientific | 2022 |
| Madlaveien Invest AS | Real estate | 2012 |
| Madonna Frisørene AS | Other services | 1998 |
| Madonna Frisørene Maxi AS | Other services | 2014 |
| Madonna Holding AS | Other services | 2005 |
| Madriku AS | Hospitality | 2014 |
| Mafe Holding AS | | 2025 |
| Magnus Østeraas Invest AS | | 2019 |
| Maho Eiendom AS | Professional & scientific | 2019 |
| Maikens Grøde AS | Financial services | 2006 |
| Maintenon AS | Professional & scientific | 2021 |
| Making View AS | Information & communication | 2006 |
| Malmgren Handel AS | Wholesale & retail | 2026 |
| Malte AS | Wholesale & retail | 2014 |
| Mama Made AS | Professional & scientific | 2021 |
| Manticore AS | Information & communication | 2005 |
| Marcus Dalen AS | | 2025 |
| Marius Bakken Holding AS | Professional & scientific | 2021 |
| Markedsinfo AS | Professional & scientific | 1999 |
| Marmar AS | | 2021 |
| Marshall Holding AS | Real estate | 2019 |
| Masa 0104 Holding AS | Professional & scientific | 2021 |
| Masa AS | Health & social care | 2005 |
| Maskin-Frakt AS | Transport & logistics | 2015 |
| Massetransport Innlandet AS | Transport & logistics | 2021 |
| Matheo Eiendom AS | Real estate | 2018 |
| Maui-Holding AS | | 2019 |
| Mawen AS | Information & communication | 2021 |
| Mawi Alam Holding AS | | 2025 |
| Maxi Bilpleie Og Bilvask AS | Other services | 2018 |
| Maximera Boligstyling AS | Professional & scientific | 2017 |
| MBS Modeling AS | Professional & scientific | 2019 |
| Mcmxciii AS | Real estate | 2019 |
| Meb AS | | 2025 |
| Mediaengine AS | Information & communication | 2023 |
| Medisam AS | Health & social care | 2020 |
| Medisingruppen AS | Health & social care | 2023 |
| Medisinsk Hudklinikk AS | Health & social care | 2007 |
| Medisinske Tjenester AS | Health & social care | 2005 |
| Medli AS | Health & social care | 1997 |
| Medwind AS | Real estate | 2023 |
| Megleroppgjøret Innlandet AS | Real estate | 2022 |
| Melby Equity AS | | 2026 |
| Memphis Bound Productions AS | Information & communication | 2013 |
| Mestergruppen Boligpartner AS | Real estate | 2024 |
| Mestergull Hamar AS | Wholesale & retail | 2006 |
| Metalabs Holding AS | | 2024 |
| MG Malerservice AS | Construction | 2022 |
| Midmat AS | Wholesale & retail | 2023 |
| Midtbyen Park AS | Real estate | 2019 |
| Midtens AS | Real estate | 2018 |
| Midtstranda 45 AS | Real estate | 2013 |
| Midtstranda Eiendom AS | Real estate | 2024 |
| Midtstranda Holding AS | Real estate | 2023 |
| Miki Maleservice AS | Construction | 2016 |
| Mikstor AS | Administrative & support | 2003 |
| Min Vaktmester AS | Administrative & support | 2021 |
| Minel AS | Construction | 1998 |
| Minel Elmontasje AS | Construction | 2006 |
| Minel Holding AS | Construction | 2018 |
| Minel Teknologi AS | | 2023 |
| Mitthamar.No AS | Information & communication | 2026 |
| MJ Manor AS | Real estate | 2026 |
| Mjøsa Flyttebyrå AS | Transport & logistics | 2018 |
| Mjøsa Klatresenter AS | Education | 2023 |
| Mjøsa Naturstein Ans | Manufacturing | 2001 |
| Mjøsanker AS | Education | 1997 |
| Mjøsanker Jobb Og Utvikling AS | Health & social care | 2018 |
| Mjøsanker Karriere AS | Education | 2018 |
| Mjøsanker Kommunale Tjenester AS | Health & social care | 2023 |
| Mjøsbyen AS | Real estate | 2017 |
| Mjøsconsult AS | Professional & scientific | 1996 |
| Mjøsen Kafferøsteri AS | Manufacturing | 2018 |
| Mjøsgløtt Holding AS | Professional & scientific | 1990 |
| Mjøsinvest AS | Professional & scientific | 2017 |
| Mjøstårnet AS | Real estate | 2016 |
| Mjøsvenner AS | Hospitality | 2022 |
| Mla Holding AS | Financial services | 2013 |
| MN Tannlegeklinikk AS | Health & social care | 2017 |
| MNN Invest AS | | 2024 |
| Modesty AS | Other services | 2008 |
| Moelven Jernstøperi AS | Real estate | 2013 |
| Mogens Av Mons AS | Hospitality | 2026 |
| Momasa AS | Wholesale & retail | 2022 |
| Mono Arkitekter AS | Professional & scientific | 2015 |
| Mono Hytter AS | Construction | 2020 |
| Mono Tradition AS | Construction | 2020 |
| Moondrop AS | Information & communication | 2011 |
| Morgongry AS | Real estate | 2010 |
| Morten Silkebækken AS | Real estate | 2009 |
| Mossy Bear Studios AS | Information & communication | 2025 |
| Motnor AS | | 2026 |