| Løkkacatering AS | Hospitality | 2019 |
| M Gransborg Consulting AS | Information & communication | 2024 |
| M. Wangen AS | | 2021 |
| M.R.K. Holding AS | Professional & scientific | 2013 |
| M.S. Invest AS | | 2023 |
| Maaki Holding AS | | 2022 |
| Mabucon AS | Information & communication | 2012 |
| Mad-Croc Norge AS | | 2026 |
| Madames Mada Nuf | Wholesale & retail | 2024 |
| Magorie AS | Professional & scientific | 2025 |
| Magrod Boligforvaltning AS | Real estate | 2020 |
| Magrod Boligutvikling AS | Real estate | 2018 |
| Magrod Invest AS | Professional & scientific | 2005 |
| Magrod Utvikling AS | Real estate | 2022 |
| Maiblomvegen 18 AS | Real estate | 2020 |
| Maile AS | Hospitality | 2023 |
| Malerfirma Ole Flatlie AS | Construction | 2014 |
| Malux Norge AS | Wholesale & retail | 2019 |
| Malvik Undervisning Trafikkskole AS | Education | 2022 |
| Manesjen Frisør Nuf | Other services | 2009 |
| Mango Eiendom AS | Real estate | 2013 |
| Manke AS | Other services | 2021 |
| Maol Holding AS | Real estate | 2012 |
| Map Media Solutions AS | Information & communication | 2012 |
| Markedsrådgiveren AS | Professional & scientific | 2026 |
| Martins Jessheim AS | Hospitality | 2020 |
| Maskin Konsulenten AS | Administrative & support | 2019 |
| Master on Consulting AS | Education | 2022 |
| Matcha Og Mocha AS | Hospitality | 2025 |
| Matezy AS | Information & communication | 2025 |
| Mati Holding AS | | 2025 |
| Matman AS | Hospitality | 2025 |
| Maximus One AS | Real estate | 2022 |
| Maximus Two AS | Real estate | 2022 |
| Maxmobil AS | Professional & scientific | 2025 |
| Mbil AS | Wholesale & retail | 2019 |
| Mbrinvest AS | | 2022 |
| MC Veteran & Deler Ans | | 1995 |
| Me & Marlea AS | Professional & scientific | 2021 |
| Mehus Bygg AS | Construction | 2023 |
| Meiserudtunet AS | Real estate | 2017 |
| Mel Asker 1 AS | Real estate | 2024 |
| Mel Asker 2 AS | Real estate | 2024 |
| Mel Asker 3 AS | Real estate | 2024 |
| Mel Asker 4 AS | Real estate | 2024 |
| Mel Gardermoen 12 AS | Real estate | 2021 |
| Mel Gardermoen 22 AS | Real estate | 2021 |
| Mel Gardermoen 30 AS | Real estate | 2021 |
| Mel Gardermoen 31 AS | Real estate | 2021 |
| Mel Gardermoen 34 AS | Real estate | 2021 |
| Mel Gardermoen 35 AS | Real estate | 2021 |
| Mel Gardermoen 36 AS | Real estate | 2021 |
| Mel Gardermoen 37 AS | Real estate | 2021 |
| Mel Gardermoen 8 AS | Real estate | 2021 |
| Mel Moreppen 18 AS | Real estate | 2024 |
| Mel Moreppen 19 AS | Real estate | 2024 |
| Mel Moreppen 23 AS | Real estate | 2024 |
| Mel Moreppen 28 AS | Real estate | 2024 |
| Mel Moreppen 29 AS | Real estate | 2024 |
| Mel Moreppen 30 AS | Real estate | 2024 |
| Memel Bygg AS | Construction | 2020 |
| Mercurius Publishing Da | Information & communication | 2024 |
| Mere Penger AS | | 2020 |
| Merkes AS | Health & social care | 2014 |
| MG Blikk Nuf | Construction | 2021 |
| Microspeed Technology AS | Information & communication | 2024 |
| Milepelen AS | Real estate | 2026 |
| Minfrakt AS | Transport & logistics | 2023 |
| Mira Moda AS | Manufacturing | 2021 |
| Mit Group AS | | 2026 |
| ML Interiør & Kos AS | Wholesale & retail | 2024 |
| Mobile Jessheim AS | Other services | 2011 |
| Mocca AS | Hospitality | 2008 |
| Modoustic Sports AS | Professional & scientific | 2026 |
| Moe Eiendomsdrift AS | Real estate | 2024 |
| Moelind AS | Real estate | 2024 |
| Moelven Modus AS | Manufacturing | 1989 |
| Mogan Consult AS | Professional & scientific | 2017 |
| Molbrook Capital AS | Wholesale & retail | 2020 |
| Molde Spedisjon Holding AS | Transport & logistics | 2011 |
| Montering 1 AS | Construction | 2013 |
| Moonlanding AS | Professional & scientific | 2019 |
| Moonshots AS | Professional & scientific | 2021 |
| Mosetertoppen Utsikten AS | Real estate | 2022 |
| Motinden AS | Professional & scientific | 2014 |
| MR Rønaas Invest AS | | 2021 |
| Mschlander Holding AS | Real estate | 2010 |
| MSS Holding AS | Real estate | 2016 |
| MT Media AS | Wholesale & retail | 2015 |
| Mtmm Development AS | Construction | 2025 |
| Mursystem Holding AS | Construction | 2021 |
| Mursystemer AS | Construction | 2024 |
| Mutatio Consulting AS | Professional & scientific | 2019 |
| Muuto AS | Real estate | 2012 |
| MW Group Norge AS | Information & communication | 2018 |
| Myrhaugmarka Boligutvikling AS | Real estate | 2026 |
| Myrvangvegen 8 AS | Real estate | 2008 |
| Møbelhuset AS | Wholesale & retail | 1987 |
| Naissus Bil AS | Wholesale & retail | 2023 |
| Naturens Rike AS | Administrative & support | 2026 |