| Medusa Holding AS | Real estate | 2015 |
| Medvinn AS | | 2024 |
| Meeget AS | Professional & scientific | 2025 |
| Megafix Bilverksted AS | Wholesale & retail | 2018 |
| Megleren Invest AS | Real estate | 2016 |
| Mego Holding AS | Professional & scientific | 2022 |
| Meik AS | Construction | 2007 |
| Meik Gruppen AS | Construction | 2024 |
| Meik Stavanger AS | Construction | 2025 |
| Meisland Bygg AS | Real estate | 2016 |
| Meisland Trapp AS | Manufacturing | 2007 |
| Mekjarvik 2 AS | Real estate | 2013 |
| Melcal AS | Manufacturing | 2004 |
| Meliori AS | Arts & recreation | 2025 |
| Melkebaren AS | Hospitality | 2005 |
| Melketeknikk.No AS | Manufacturing | 2018 |
| Mem Services AS | Construction | 2022 |
| Meraj Holding AS | | 2024 |
| Meraki Beauty Shop AS | Wholesale & retail | 2024 |
| Meraki Frisør AS | Other services | 2018 |
| Merci Sweet Cafe AS | | 2026 |
| Merlina AS | Health & social care | 2025 |
| Merlina Eiendom AS | Real estate | 2025 |
| Merlina Holding AS | | 2025 |
| Merlina Utvikling AS | | 2026 |
| Mesk Holding AS | Real estate | 2020 |
| Mesol Invest AS | | 2026 |
| Messelager AS | Administrative & support | 2025 |
| Mesth AS | Professional & scientific | 2025 |
| Metaline AS | Professional & scientific | 2018 |
| Metrix AS | Financial services | 2011 |
| Metron Automasjon AS | Wholesale & retail | 2014 |
| Mette Collett & Partners AS | Education | 2025 |
| Mev Finans AS | | 2023 |
| Mev Invest AS | | 2012 |
| Mewell AS | Education | 2024 |
| Mexa AS | Other services | 2008 |
| Mexa Sandnes AS | Hospitality | 2018 |
| Mexican Fast Food AS | Hospitality | 1991 |
| Meze Restaurant Sandnes AS | Hospitality | 2024 |
| Mfloysvik AS | Administrative & support | 2026 |
| MGK Eiendom AS | Real estate | 2022 |
| MH Graving AS | Construction | 2024 |
| MH Maskinutleie AS | Administrative & support | 2017 |
| MH Tronic AS | Real estate | 1993 |
| Mhtronic-It AS | Wholesale & retail | 2014 |
| Miau Katteklinikk Og Kattehotell AS | Professional & scientific | 2025 |
| Micap AS | Wholesale & retail | 1992 |
| Midnight Performance AS | Information & communication | 2024 |
| Midtbergveien 2 AS | Real estate | 2022 |
| Mig Eiendom AS | Real estate | 2005 |
| Mike Invest AS | | 2017 |
| Mike MK AS | Administrative & support | 2022 |
| Mikke Invest AS | Financial services | 2017 |
| Milanland AS | Arts & recreation | 2026 |
| Miljöprotector AS | Manufacturing | 2024 |
| Miljø Elektro AS | Construction | 1991 |
| Miljø Elektro Holding 2 AS | Construction | 2014 |
| Miljø Rør AS | Construction | 2020 |
| Miljø Transport AS | Real estate | 1992 |
| Miljøbetong AS | Manufacturing | 2015 |
| Mill Invest AS | | 2026 |
| Millennium Shipping AS | Transport & logistics | 1999 |
| Minglemat AS | Wholesale & retail | 2020 |
| Mini Modes Da | Professional & scientific | 2021 |
| Mint Service AS | Professional & scientific | 2017 |
| Mintex AS | Information & communication | 2026 |
| Miomilian AS | | 2025 |
| Mirage Coating AS | Manufacturing | 2023 |
| Mirek AS | Professional & scientific | 2021 |
| Mirmorax AS | Professional & scientific | 2009 |
| Miron Bygg AS | Construction | 2024 |
| Mitor AS | Administrative & support | 2022 |
| Mivanor AS | Manufacturing | 2014 |
| Mivaren Da | Real estate | 1994 |
| Mivarfem Da | Real estate | 1994 |
| Mivarfire Da | Real estate | 1994 |
| Mivarto Da | Real estate | 1994 |
| Mivartre Da | Real estate | 1994 |
| Mix Import AS | Wholesale & retail | 2014 |
| Mjato Invest AS | | 2021 |
| Mje Holding AS | Real estate | 2015 |
| MJN20 AS | Real estate | 2022 |
| MJN21 AS | Real estate | 2022 |
| Mjåvannsvegen 94 AS | Real estate | 2022 |
| Mjølne AS | | 2018 |
| MK Bedriftsutvikling AS | Professional & scientific | 2001 |
| MK Energi Transport AS | Transport & logistics | 2018 |
| MK Gamleveien 87 AS | Real estate | 2002 |
| MK Hudklinikk Sandnes AS | Other services | 2026 |
| MK Kobberveien 43 AS | Real estate | 2015 |
| Mk&Co AS | Real estate | 2015 |
| MN Kapital AS | | 2026 |
| MNS Transport AS | Transport & logistics | 2021 |
| Mobekk Invest AS | Real estate | 2014 |
| Mobydo AS | Information & communication | 2017 |
| Moddsen AS | Manufacturing | 2019 |
| Modena Fliser AS | Wholesale & retail | 1991 |
| Modena Gruppen AS | Wholesale & retail | 1986 |
| Modern Design AS | Other services | 2022 |