| Loennechen AS | | 2018 |
| Logic Event Management AS | Professional & scientific | 1989 |
| Lojal AS | Real estate | 2012 |
| Loyning Management Consultants AS | Professional & scientific | 2021 |
| Ludens AS | Hospitality | 2006 |
| Lyckelig AS | Professional & scientific | 2015 |
| Lyd-Espen Holding AS | Real estate | 2020 |
| Lysaker Torg 6-12 AS | Real estate | 2025 |
| Lysakerbygg AS | Construction | 2020 |
| Lysesvart Invest AS | | 2021 |
| Lød Eiendom AS | Real estate | 2011 |
| Løke Sitek Holding AS | | 2025 |
| Løset Invest AS | | 2025 |
| M&G Invest AS | Real estate | 2009 |
| M-4 Holding AS | Financial services | 2018 |
| Mabi AS | Financial services | 2019 |
| Mack Ege Invest AS | | 2025 |
| Magcap AS | Real estate | 2016 |
| Magnit Global Denmark Aps | Administrative & support | 2008 |
| Mago C AS | Real estate | 2025 |
| Magon AS | Professional & scientific | 2018 |
| Maja Invest AS | | 2021 |
| Majark AS | Professional & scientific | 2017 |
| Makeme AS | Professional & scientific | 2020 |
| Malerfirmaet Bull Enger AS | Construction | 2008 |
| Malermester Anders Eng AS | Construction | 2007 |
| Maly Holding AS | | 2026 |
| Mamen Mølle Norge | Construction | 2008 |
| Mana Vertikal AS | Construction | 2016 |
| Manilu Holding AS | Wholesale & retail | 2019 |
| Maperfo AS | Information & communication | 2022 |
| Mar Shipping AS | | 2023 |
| Mara Coaching AS | Education | 2008 |
| Maragruppen AS | | 2023 |
| Margo- Wojchiech Kilijan | Construction | 2004 |
| Marin Detailing AS | Other services | 2024 |
| Marius AS | Wholesale & retail | 1987 |
| Martinsen & Stenstad Boligentreprenør AS | Real estate | 2007 |
| Marugame AS | | 2017 |
| Maveso AS | Financial services | 2018 |
| MCL Holding AS | Financial services | 2015 |
| Med-Nett AS | Wholesale & retail | 2003 |
| Medano AS | Professional & scientific | 2025 |
| Medley Holding AS | Real estate | 1997 |
| Medweb Ans | Information & communication | 1996 |
| Mel Asker 18 AS | Real estate | 2024 |
| Mellem AS | Real estate | 2019 |
| Mena E.R.A Institut AS | Professional & scientific | 2023 |
| Metis Cyberspace Technology (Norway) Nuf | Information & communication | 2021 |
| Metrohm Nordic AS | Wholesale & retail | 1999 |
| Metropolen Media AS | Information & communication | 2023 |
| MG Holdingselskap AS | Information & communication | 2005 |
| MG Invest Og Eiendom AS | Financial services | 2005 |
| MGK Capital AS | | 2023 |
| Midgar AS | Financial services | 2007 |
| Mikhan AS | | 2021 |
| Millennium Capital AS | Real estate | 1991 |
| Minas AS | | 2022 |
| Mind Consult AS | Information & communication | 2021 |
| Minst Holding AS | | 2018 |
| Mira Eiendom AS | Real estate | 2016 |
| Mirabo Eiendom Ans | Real estate | 2001 |
| Mista Invest AS | Real estate | 2015 |
| Mitchi Sportswear AS | Wholesale & retail | 2014 |
| Mixto AS | Wholesale & retail | 2017 |
| MK Investering AS | Real estate | 2005 |
| Mo-Tekk Industrier AS | Construction | 1988 |
| Mo-Tekk Interiør AS | Construction | 2013 |
| Mohaak AS | | 2005 |
| Monel Fashion AS | Wholesale & retail | 2000 |
| Monel Holding AS | Wholesale & retail | 1991 |
| Montessoribarnehagen Villekulla AS | Education | 1999 |
| Morellen AS | Real estate | 2004 |
| Mountachè Management AS | Professional & scientific | 2015 |
| Mountain Roast Artisan Coffee AS | Hospitality | 2023 |
| MS Malerservice AS | Construction | 2024 |
| Mta Business Solutions AS | Professional & scientific | 2021 |
| Mta Consulting AS | Professional & scientific | 2012 |
| Mta Group 2 AS | Professional & scientific | 2024 |
| Mta Group AS | Professional & scientific | 2017 |
| Mta Learning Center AS | Education | 2017 |
| Muchi Holding AS | Real estate | 2016 |
| Muninn Tech AS | Information & communication | 2024 |
| MV8 Invest AS | | 2025 |
| Mylearnbook AS | Information & communication | 2001 |
| Mylnar AS | | 2017 |
| Mypeople Holding AS | Professional & scientific | 2020 |
| Møllefossen Cafe AS | Hospitality | 2020 |
| Na Na Agency AS | Wholesale & retail | 2022 |
| Nabla Consulting AS | Professional & scientific | 2006 |
| Namo BPM AS | Information & communication | 2022 |
| Napaj AS | Information & communication | 2013 |
| Narverud Apartment AS | Real estate | 2005 |
| Nautron AS | Wholesale & retail | 2020 |
| Navio Mobility Group AS | Information & communication | 2021 |
| Nawigare AS | Professional & scientific | 2000 |
| NB 14 Holding AS | Financial services | 2010 |
| Nedre Høvik Båthavn SA | Arts & recreation | 2023 |
| Nedre Høvik Holding AS | Financial services | 2017 |
| Neerulabs AS | Information & communication | 2026 |