| Migrainepolice AS | Information & communication | 2012 |
| Mikkelborg Media Nuf | Information & communication | 2016 |
| Mimema Invest AS | | 2021 |
| Min Muskelterapeut AS | Health & social care | 2021 |
| Minel Gjøvik AS | Construction | 2003 |
| Mjas Invest AS | | 2019 |
| MJC Aspelund AS | Professional & scientific | 2023 |
| Mjøs Elektro AS | Construction | 1992 |
| Mjøs Kirurgene Lege Og Spesialistsenter AS | Health & social care | 1994 |
| Mjøsa Forsikring AS | Financial services | 2021 |
| Mjøsa Tomteutvikling AS | Real estate | 2019 |
| Mjøsbil AS | Wholesale & retail | 1988 |
| Mjøsdata AS | Wholesale & retail | 2000 |
| Mjøssentret AS | Real estate | 1994 |
| Mjøsstranda AS | Real estate | 2012 |
| Mjøstannlegene Gjøvik AS | Health & social care | 2011 |
| Mm-Eiendom AS | Real estate | 2001 |
| MMC Contracting AS | Professional & scientific | 1999 |
| MMC Eiendom AS | Real estate | 1993 |
| MMC Hotels AS | Real estate | 1986 |
| MMC Investment AS | Real estate | 2007 |
| Moana AS | Information & communication | 2024 |
| Mobai AS | Information & communication | 2019 |
| Mobil & PC Fiks AS | Other services | 2021 |
| Mobility Partner AS | Real estate | 2024 |
| Moelv Bil & Caravan AS | Wholesale & retail | 2020 |
| Moffa Holding AS | | 2023 |
| Moicon Digital Twin AS | Information & communication | 2024 |
| Mona Ørbekk Olsen Nuf | Professional & scientific | 2008 |
| Monabakken AS | Real estate | 2017 |
| Moneyflow AS | Professional & scientific | 2018 |
| Monssveen Barnehage SA | Education | 2002 |
| Mood Nordic Norge AS | Wholesale & retail | 2015 |
| Mops Holding AS | Financial services | 2015 |
| Morho Holding AS | Manufacturing | 2024 |
| Moserabben AS | Financial services | 2005 |
| Mosteriet På by AS | Real estate | 2020 |
| MPR Eiendom AS | Real estate | 2014 |
| MR. Uy AS | Hospitality | 2016 |
| MS Laham AS | Professional & scientific | 2024 |
| MSN Holding AS | | 2018 |
| Mtss Da | Education | 2025 |
| Muchlove AS | Wholesale & retail | 2025 |
| Mudo Gym Gjøvik AS | Arts & recreation | 2013 |
| Munchiesongo AS | Hospitality | 2026 |
| Munnviken Tannklinikk AS | Health & social care | 2021 |
| Murerfirma Morten Norbeck AS | Construction | 2014 |
| Murermester/Flislegger Tony Wainwright AS | Construction | 2014 |
| Murmester Alf V. Olsen AS | Construction | 2005 |
| Musikk I Innlandet AS | Arts & recreation | 2021 |
| Mustad Autoline AS | Manufacturing | 2004 |
| Mustad Næringspark AS | Real estate | 2003 |
| Mustad Sealine AS | Manufacturing | 2017 |
| Mustad Støperi AS | Real estate | 2007 |
| Mustad Åmodt AS | Real estate | 2025 |
| Mustadparken AS | Real estate | 2025 |
| Myfoto AS | Wholesale & retail | 2020 |
| Myhr AS | Wholesale & retail | 2023 |
| Myhrvang Invest AS | Financial services | 2008 |
| Malterud Eiendom AS | Real estate | 1964 |
| Mæhlum Samdrift Da | Agriculture & fishing | 2001 |
| Mølla Senter AS | Real estate | 2009 |
| Mølla Senterdrift AS | Real estate | 2010 |
| Møllergata 6 AS | Real estate | 2016 |
| Nagell & Wentzel Ans | Arts & recreation | 2005 |
| Nagell Holding AS | | 2022 |
| Naturligvis AS | Wholesale & retail | 2017 |
| Nawarat Thai Mat AS | Hospitality | 2022 |
| Ncab Group Norway AS | Wholesale & retail | 1998 |
| Nedre Torvgate 12 AS | Real estate | 2010 |
| Nedre Torvgate 4 Gjøvik Da | Real estate | 2005 |
| Nedre Torvgate 6 Holding AS | Real estate | 2024 |
| Nedre Torvgate 6 Næring AS | Real estate | 2024 |
| Nedre Torvgate 8-10 AS | Real estate | 2018 |
| Nedre Torvgate AS | Real estate | 2017 |
| Nereng Holding AS | | 2021 |
| Nesset Blikk AS | | 2025 |
| Netsure AS | Information & communication | 2024 |
| Nettdekk AS | Wholesale & retail | 2016 |
| Nettum AS | Agriculture & fishing | 2023 |
| Nevergiveup AS | Professional & scientific | 2005 |
| New Media AS | Information & communication | 2006 |
| New Sushi Factory AS | Hospitality | 2025 |
| Nido Invent AS | Professional & scientific | 2018 |
| Nilsen Kran Og Industriservice AS | Construction | 2013 |
| Ninas Traktering AS | Hospitality | 2025 |
| Niven AS | Professional & scientific | 2023 |
| Nme AS | Real estate | 2021 |
| No-Rø Eiendom AS | Real estate | 2016 |
| Noidoi Da | Professional & scientific | 2014 |
| Norcons AS | Information & communication | 2005 |
| Nordbo Eiendom AS | Real estate | 2026 |
| Nordbo Mjøsa AS | Real estate | 1986 |
| Nordbohus Innlandet AS | Construction | 2011 |
| Nordic Capital Invest AS | Real estate | 2026 |
| Nordic Coin AS | Information & communication | 2026 |
| Nordic Football Academy Norge AS | Professional & scientific | 2020 |
| Nordic Material Technologies Holding AS | | 2024 |
| Nordic Pass AS | Professional & scientific | 2026 |
| Nordisdekkimportør AS | | 2026 |