| Lunt Sted AS | Real estate | 2024 |
| Lupke Invest AS | Financial services | 2005 |
| Luso-Nor Holding AS | Real estate | 2011 |
| LVK Invest AS | Real estate | 2015 |
| LW Estate AS | Real estate | 2017 |
| Lyd AS | Administrative & support | 2006 |
| Lykkejegeren AS | Wholesale & retail | 2012 |
| Lyngtun Breivika AS | Real estate | 2016 |
| Lyngtun Holding AS | Real estate | 2019 |
| Lås Og Sikkerhet AS | Wholesale & retail | 2012 |
| Låsservice Møre AS | Real estate | 2019 |
| Låsservice Ålesund AS | Wholesale & retail | 2006 |
| Lærdal Øyraplassen 2 AS | Real estate | 2024 |
| Løkka Trading Eftf AS | Wholesale & retail | 2012 |
| Løkken Kjøpesenter AS | Real estate | 2011 |
| Løve Pedersen Invest AS | | 2026 |
| LØVE18 Invest AS | | 2016 |
| Løvenvold Helse Og Velvære AS | Other services | 2007 |
| Løvenvold Private Hudpleieskole AS | Education | 2022 |
| Løvenvold Tannlegesenter AS | Health & social care | 2011 |
| Løvenvold Theater AS | Arts & recreation | 2021 |
| Løvenvold Theater Eiendom AS | Real estate | 2022 |
| Løvoll Design AS | | 2026 |
| M Berget Holding AS | Financial services | 2018 |
| M Studios AS | Real estate | 2004 |
| M&M Borgund AS | Real estate | 2021 |
| M&M Borgund II AS | Real estate | 2020 |
| M&M Hatlahaugen AS | Real estate | 2011 |
| M&M Holding Ålesund AS | Real estate | 2008 |
| M&M Høgtun AS | Real estate | 2025 |
| M&M Myrabakken AS | Real estate | 2008 |
| M&M Prosjektutvikling Ålesund AS | Professional & scientific | 2001 |
| M&M Tverrveien AS | Real estate | 1997 |
| M&T Beauty Nails AS | Other services | 2019 |
| M-Corp AS | Administrative & support | 2005 |
| M. Moller Holding AS | | 2025 |
| M.Enebakk Holding AS | | 2023 |
| M3 Transport AS | Transport & logistics | 2013 |
| M64 Invest AS | | 2023 |
| Maanelys AS | | 2021 |
| Maaseide Transport Og Kran AS | Transport & logistics | 2025 |
| Maban Konsult AS | Professional & scientific | 2024 |
| Machine Products Eiendom AS | Real estate | 1997 |
| Machine Products Holding AS | Professional & scientific | 1985 |
| Machine Products Storkjøkken AS | Wholesale & retail | 2009 |
| Madsen Transport & Maskin AS | Construction | 2014 |
| Madsens Holding AS | Real estate | 2023 |
| Maestranza AS | Professional & scientific | 2018 |
| Maestro Kapital AS | | 2023 |
| Magne Kjell Holding AS | Financial services | 2016 |
| Magnus Kleven Holding AS | | 2020 |
| Magrome AS | | 2017 |
| Majoma Media AS | Professional & scientific | 2020 |
| Mako Eiendom AS | Information & communication | 2009 |
| Makrima AS | Professional & scientific | 2021 |
| Malermester Bjørnøy AS | Construction | 2012 |
| Malermester Mele AS | Construction | 2005 |
| Malvin Consulting AS | Administrative & support | 2020 |
| Mamma Mia AS | Hospitality | 2022 |
| Mand AS | | 2026 |
| Manhattan AS | Financial services | 2020 |
| Mansun AS | Financial services | 2005 |
| Maok AS | | 2021 |
| Mapa AS | | 2021 |
| Marcelo AS | Other services | 2015 |
| Marcus Auto AS | Wholesale & retail | 2024 |
| Maredeus Norway AS | Wholesale & retail | 2012 |
| Marejo AS | Financial services | 2018 |
| Marem Holding AS | | 2025 |
| Maren Holding AS | | 2020 |
| Margarida Pais Arkitektur AS | Professional & scientific | 2014 |
| Marhe AS | | 2023 |
| Marida AS | Financial services | 2012 |
| Marine Muligheter AS | Transport & logistics | 2025 |
| Marine Rådgivningstjenester AS | Professional & scientific | 1992 |
| Marine Sales AS | Wholesale & retail | 1987 |
| Marine Sales Stokksund AS | Wholesale & retail | 2008 |
| Marinelektronikk AS | Wholesale & retail | 2005 |
| Marint Ressurssenter AS | Professional & scientific | 2021 |
| Marinutra AS | Professional & scientific | 2011 |
| Marisafe AS | Education | 2024 |
| Maritim Management AS | Professional & scientific | 2005 |
| Maritim Research I AS | Professional & scientific | 2006 |
| Maritime Intelligence Group AS | Information & communication | 2026 |
| Maritime Partner AS | Manufacturing | 1994 |
| Maritime Polarwood AS | Construction | 2006 |
| Maritime Servicebase AS | Real estate | 2015 |
| Maritime Support Group AS | Professional & scientific | 2016 |
| Marius Lupe Holding AS | | 2023 |
| Marport Norge AS | Wholesale & retail | 2017 |
| Marthe Vadders Rideskole AS | Education | 2023 |
| Martin Walderhaug Eftf AS | Manufacturing | 2000 |
| Marzeal AS | Professional & scientific | 2020 |
| Maråk Holding AS | | 2019 |
| Masaga AS | Manufacturing | 2022 |
| Maskeriet AS | Wholesale & retail | 2025 |
| Maskindynamikk AS | Professional & scientific | 1989 |
| Maskinsenteret AS | Real estate | 1988 |
| Maskinutleie Ålesund AS | Administrative & support | 2012 |
| Mass Da | Wholesale & retail | 2025 |