| MBV Eiendom AS | Real estate | 2006 |
| MC Music AS | Information & communication | 2025 |
| MC Sør AS | Wholesale & retail | 2021 |
| MCF AS | | 2020 |
| Mcinerney Holding AS | Professional & scientific | 2021 |
| Mcinerney Malerfirma AS | Construction | 2020 |
| MCN AS | Wholesale & retail | 2023 |
| Mcneill Projects AS | Professional & scientific | 2025 |
| MCP AS | Transport & logistics | 2026 |
| MD Transport AS | Transport & logistics | 2022 |
| Mdco Agder AS | Health & social care | 2008 |
| MDV AS | | 2007 |
| Me & Mine AS | Information & communication | 2008 |
| Me&Bee Procurement Service AS | Administrative & support | 2012 |
| Meals AS | Administrative & support | 2018 |
| Mean Bean AS | Hospitality | 2008 |
| Meat Master AS | Wholesale & retail | 2017 |
| Mechatronics Solutions AS | Professional & scientific | 2025 |
| Medeasy AS | Education | 2021 |
| Medeasy Group AS | Education | 2017 |
| Mediasignal Nordic AS | Information & communication | 2023 |
| Medieanne AS | Professional & scientific | 2018 |
| Medieverkstedet AS | Administrative & support | 2018 |
| Medikey AS | Professional & scientific | 2018 |
| Meditek Medisinsk Utstyr AS | Wholesale & retail | 2004 |
| Medivida AS | Administrative & support | 2024 |
| Medspiller AS | Professional & scientific | 2026 |
| Medusa AS | Wholesale & retail | 2023 |
| Medvind Holdco AS | | 2025 |
| Medvind Trening 2 AS | Education | 2025 |
| Medvind Trening AS | Education | 2023 |
| Megaflis Sørlandsparken AS | Wholesale & retail | 2002 |
| Meglerhuset Sør AS | Real estate | 2024 |
| Meglerlokalet AS | Real estate | 2007 |
| Meisel AS | Professional & scientific | 2023 |
| MEKK ANS Per Gunnar Andersen og Per Kjartan Huse | Administrative & support | 1990 |
| Meko Sør AS | Real estate | 2011 |
| Mel Service AS | Administrative & support | 2025 |
| Melast AS | Construction | 2022 |
| Mellerud Management AS | Professional & scientific | 2013 |
| Mellomstor AS | Wholesale & retail | 2013 |
| Melody Networks AS | Professional & scientific | 2024 |
| Meltaway AS | Manufacturing | 2024 |
| Memedeq AS | Wholesale & retail | 2023 |
| Memo Chartering & Invest AS | Transport & logistics | 2023 |
| Memo Regnskap AS | Professional & scientific | 2017 |
| Memo Shipping AS | Transport & logistics | 2023 |
| Memonas Beauty Room AS | Other services | 2012 |
| Memoré AS | Professional & scientific | 2022 |
| Memotek Invest AS | | 2020 |
| Mentaldesign Productions Da | Professional & scientific | 2004 |
| Mentalmomentum AS | Education | 2024 |
| Mentalmomentum Technologies AS | Information & communication | 2025 |
| Mentor Partner AS | Professional & scientific | 1996 |
| Meps Invest AS | | 2018 |
| Mer Norway AS | Energy | 2009 |
| Mer.Golf AS | | 2025 |
| Mer.Golf Holding AS | | 2025 |
| Merchant Maritime AS | | 2025 |
| Merethe Breland Frisør AS | Other services | 2026 |
| Mergel AS | Real estate | 2021 |
| Merion Holding AS | | 2026 |
| Meritum Accounting AS | Professional & scientific | 2024 |
| Meritum Holding AS | Professional & scientific | 2008 |
| Merkant AS | Professional & scientific | 1969 |
| Merkverdig AS | Professional & scientific | 2024 |
| Mersland Holding AS | Wholesale & retail | 2023 |
| Mertoun Capital AS | | 2009 |
| Mes Holding AS | Other services | 2021 |
| Mesel Invest AS | Real estate | 2013 |
| Mesel Lederutvikling AS | Professional & scientific | 2020 |
| Mesterbrygg AS | Wholesale & retail | 2015 |
| Mesterbygg Kristiansand AS | Real estate | 2016 |
| Mesterhus Kristiansand AS | Construction | 2024 |
| Mestermø Invest AS | Financial services | 2013 |
| Metalco AS | Manufacturing | 2005 |
| Metalco Pulverlakk AS | Manufacturing | 2025 |
| Metalco. AS | Manufacturing | 2025 |
| Metall Maskin AS | Wholesale & retail | 1982 |
| Metogården AS | Real estate | 2014 |
| Meventus AS | Professional & scientific | 2005 |
| Mexo AS | Professional & scientific | 2022 |
| MG Næring Kristiansand AS | Real estate | 2010 |
| Mga Consulting AS | Professional & scientific | 2023 |
| MGN AS | Real estate | 2010 |
| MH Arctic AS | Construction | 2017 |
| MH27 Invest AS | | 2022 |
| Mha Invest AS | Real estate | 1997 |
| Mhlj Holding AS | | 2025 |
| MHT Bruktsalg & Reolutleie AS | Administrative & support | 2020 |
| Mhwirth AS | Manufacturing | 1987 |
| Mhwirth Holdco AS | | 2021 |
| Mi-Control AS | Manufacturing | 2015 |
| Mia Investment AS | | 2024 |
| Mia Media AS | Arts & recreation | 2019 |
| Miabell Hudpleie AS | Other services | 2018 |
| Miabell Undertøysalong AS | Wholesale & retail | 1987 |
| Miabello AS | Real estate | 2014 |
| Miami Frisør AS | Other services | 2024 |
| Miberry AS | Wholesale & retail | 2017 |