| MMC First Process AS | Manufacturing | 1997 |
| Mmcfp Holding AS | Manufacturing | 2019 |
| Modeca AS | Wholesale & retail | 1984 |
| Moen Eiendom Holding AS | Wholesale & retail | 2021 |
| Moen Eigedom AS | Real estate | 2021 |
| Moens Mathus AS | Wholesale & retail | 2021 |
| Mon Holding AS | | 2018 |
| Monita Fosnavåg AS | Wholesale & retail | 2004 |
| MTN Holding AS | | 2026 |
| MTN Mat AS | Wholesale & retail | 2024 |
| Myklebust AS | | 2021 |
| Myklebuståsen Utbygging AS | Real estate | 2011 |
| Myklegard AS | | 2020 |
| NG Spar Møre AS | Wholesale & retail | 2008 |
| Nifra Invest AS | | 2023 |
| Nina Flem AS | Wholesale & retail | 2020 |
| Nor-Sino Invest AS | Real estate | 2015 |
| Nord Flis AS | Wholesale & retail | 2025 |
| Nord Vest Senteret AS | Wholesale & retail | 2002 |
| Nordic Mediatech AS | Transport & logistics | 2011 |
| Nordik X AS | Wholesale & retail | 2025 |
| Nordsjøbas AS | Transport & logistics | 1987 |
| Nordvest Anlegg AS | Construction | 2017 |
| Norgard AS | | 2022 |
| Norsk Havsenter AS | Professional & scientific | 2019 |
| Norwegian Greentech AS | Professional & scientific | 2010 |
| Notaneset AS | Real estate | 2022 |
| NTK Invest AS | Agriculture & fishing | 2015 |
| Nybo Utvikling AS | Real estate | 2022 |
| Nymark Invest AS | Wholesale & retail | 2005 |
| Nyt Invesment AS | | 2023 |
| O.S Invest AS | Professional & scientific | 2005 |
| Ocean Invest AS | Education | 2018 |
| Octavius AS | Professional & scientific | 2008 |
| Octavius Consulting AS | Professional & scientific | 2023 |
| Of Marine AS | Real estate | 2011 |
| Ohi Eiendom AS | Real estate | 1998 |
| Oles Trafikkskule AS | Education | 2022 |
| Olga Holding AS | | 2024 |
| Olympic Ares AS | Mining & quarrying | 2015 |
| Olympic Artemis AS | Mining & quarrying | 2014 |
| Olympic Blue Energy AS | Transport & logistics | 2024 |
| Olympic Boreas AS | Administrative & support | 2022 |
| Olympic Challenger AS | Mining & quarrying | 2018 |
| Olympic Crew Management AS | Mining & quarrying | 2013 |
| Olympic Crewing AS | Mining & quarrying | 2005 |
| Olympic Crewing Mexico AS | Administrative & support | 2015 |
| Olympic Delta AS | Mining & quarrying | 2014 |
| Olympic Eiendom AS | Real estate | 2003 |
| Olympic Electra AS | Mining & quarrying | 2006 |
| Olympic Energy AS | Transport & logistics | 2019 |
| Olympic Group AS | Mining & quarrying | 2015 |
| Olympic Havopplevelser AS | Real estate | 2025 |
| Olympic Holding Chartering AS | Mining & quarrying | 2010 |
| Olympic Investco AS | Transport & logistics | 2024 |
| Olympic NB I AS | Transport & logistics | 2024 |
| Olympic NB II AS | Transport & logistics | 2024 |
| Olympic Nobo AS | Administrative & support | 2025 |
| Olympic Notos AS | Administrative & support | 2023 |
| Olympic Ocean AS | Administrative & support | 2021 |
| Olympic Offshore AS | Mining & quarrying | 2014 |
| Olympic Offshore Wind AS | Mining & quarrying | 2020 |
| Olympic Offshore Wind II AS | Administrative & support | 2022 |
| Olympic Operation Africa AS | Transport & logistics | 2014 |
| Olympic Operation AS | Mining & quarrying | 2013 |
| Olympic Operation II AS | Mining & quarrying | 2014 |
| Olympic Seafood AS | Agriculture & fishing | 2015 |
| Olympic Services AS | Mining & quarrying | 2016 |
| Olympic Ship AS | Transport & logistics | 1997 |
| Olympic Ship International AS | Mining & quarrying | 2015 |
| Olympic Shipping AS | Administrative & support | 1996 |
| Olympic Subsea ASA | Mining & quarrying | 2016 |
| Olympic Subsea Shipholding AS | Mining & quarrying | 2011 |
| Olympic Supply AS | Transport & logistics | 2014 |
| Olympic Taurus AS | Mining & quarrying | 2014 |
| Olympic Triton II AS | Mining & quarrying | 2014 |
| Olympic Wind Holding AS | Administrative & support | 2022 |
| Olympic Zeus AS | Transport & logistics | 2021 |
| One Blue Ocean AS | | 2018 |
| Opes Holding AS | | 2023 |
| Optikar Nymark AS | Wholesale & retail | 2005 |
| Opus Nor AS | Professional & scientific | 2005 |
| Ozo Invest AS | Financial services | 2010 |
| Pam Equipment AS | Wholesale & retail | 2004 |
| Parallelo AS | Professional & scientific | 2019 |
| Parre AS | Health & social care | 2023 |
| Partrederiet Leinebris Ans | Agriculture & fishing | 1975 |
| Per Igesund & Co | Wholesale & retail | 1959 |
| Per Igesund AS | Wholesale & retail | 1970 |
| Perlys Frisør AS | Other services | 2005 |
| PF Investering AS | Real estate | 2011 |
| PHL Holding AS | Wholesale & retail | 2012 |
| PHL Seagold AS | Wholesale & retail | 2003 |
| Pir Fiskeri AS | Agriculture & fishing | 2024 |
| Pokeplays AS | Wholesale & retail | 2026 |
| Polar Seafrozen AS | Wholesale & retail | 2012 |
| Powersave AS | Professional & scientific | 2024 |
| Priarbo AS | Agriculture & fishing | 2024 |
| Primary Mar Nuf | Financial services | 2007 |
| Prosjektbygg AS | Construction | 1993 |