| Longerlife Norge AS | Wholesale & retail | 2024 |
| LPT Drift AS | Real estate | 2021 |
| LPT Eiendom AS | Real estate | 2020 |
| LSK Eiendom AS | Construction | 2025 |
| Lucky Pizza Da | Hospitality | 2009 |
| Lucrative AS | Professional & scientific | 2021 |
| Luga AS | Real estate | 2021 |
| Lumholtz Bar Og Restauranthus Ans | Hospitality | 1994 |
| Lundadalen Fiskeindustrier AS | Wholesale & retail | 2022 |
| Lundby Eiendom AS | Real estate | 2023 |
| Lunula Fashion AS | Wholesale & retail | 2008 |
| Luxe Salong AS | Other services | 2013 |
| Lvservice AS | Construction | 2021 |
| Lycee AS | | 2014 |
| Lyng Mat & Bar AS | Hospitality | 2018 |
| Løhre & Co AS | Real estate | 2006 |
| Løkkegata 16 AS | Real estate | 2008 |
| Løkkegata Fysioterapi AS | Health & social care | 1996 |
| Lønnsomhetsutvikling AS | Real estate | 2009 |
| Løv Film AS | Information & communication | 2023 |
| M E Kval Holding AS | Construction | 2005 |
| M Gulstad Holding AS | | 2025 |
| M Og M AS | Professional & scientific | 2022 |
| M Peak Holding AS | Real estate | 2017 |
| M Strømme Holding AS | | 2022 |
| M-Neko Eiendom AS | Real estate | 2023 |
| M. Neko AS | Hospitality | 2019 |
| Magisk Eiendom AS | Real estate | 2007 |
| Maia Eiendom AS | Transport & logistics | 1989 |
| Maler'N Lillehammer AS | Construction | 2025 |
| Mamselle Frisør AS | Other services | 2003 |
| Mange Bekker Arkitektur AS | Professional & scientific | 2020 |
| Marcus Thranes Veg 5C AS | Real estate | 2026 |
| Margit Holding AS | Real estate | 2020 |
| Marit Rustadstuen Holding AS | | 2024 |
| Markla AS | Information & communication | 2023 |
| Maseka AS | Real estate | 2013 |
| Mash Partners AS | Information & communication | 2025 |
| Maskinpartner AS | Construction | 2017 |
| Matast AS | Education | 2022 |
| Matpuls AS | Professional & scientific | 2014 |
| Matskar AS | Real estate | 2017 |
| MB Partner AS | Professional & scientific | 2017 |
| MC Lillehammer AS | Wholesale & retail | 2005 |
| Mebrakt AS | Real estate | 2020 |
| Media-E AS | Information & communication | 2014 |
| Medic Øst AS | Other services | 2019 |
| Mediscarink AS | Health & social care | 2024 |
| Megalitt Gruppen AS | Real estate | 2024 |
| Mei Holding AS | Hospitality | 2018 |
| Mela AS | Arts & recreation | 2021 |
| Menkeruds Motorsenter AS | Wholesale & retail | 1997 |
| Mercura Regnskap AS | Professional & scientific | 2021 |
| Meren Consulting AS | Professional & scientific | 2005 |
| Merkol Eiendom AS | Real estate | 2003 |
| Merkol Holding AS | | 2016 |
| Mesna Eiendom AS | Real estate | 1998 |
| Mesna Fargehandel AS | Wholesale & retail | 1999 |
| Mesna Gatekjøkken AS | Hospitality | 2013 |
| Mesna Hudklinikk AS | Health & social care | 2016 |
| Mesna Hudklinikk Holding AS | Health & social care | 2022 |
| Mesna Kraftselskap Da | Energy | 1998 |
| Mesna Mat AS | Wholesale & retail | 2019 |
| Mesna Rådgivning AS | Information & communication | 2005 |
| Mesna Utvikling AS | Real estate | 1997 |
| Messywater Invest AS | | 2023 |
| MGN Holding AS | | 2021 |
| Miclis AS | Information & communication | 1985 |
| Midlaier AS | Information & communication | 2023 |
| Mile Mobility AS | Administrative & support | 2021 |
| Mime Media AS | Information & communication | 2023 |
| Minalie Music AS | Information & communication | 2024 |
| Ming Eiendom AS | Real estate | 2020 |
| Ming Restaurant AS | Hospitality | 2014 |
| Minihus Innlandet AS | Manufacturing | 2023 |
| Miox AS | Information & communication | 2026 |
| Mjogsjøen Eiendom AS | Real estate | 2005 |
| Mjøs Regnbue AS | Construction | 2019 |
| Mjøsa Gatekjøkken AS | Hospitality | 2020 |
| Mjøsa Solskjerming - Screens Og Markiser AS | Construction | 2018 |
| Mjøsanlegget AS | Energy | 2005 |
| Mjøsmor AS | Real estate | 2022 |
| Mkir Invest AS | Professional & scientific | 2018 |
| Mna Invest AS | | 2023 |
| Moavegen 10 AS | Real estate | 2004 |
| Moavegen 33 AS | Real estate | 2017 |
| Moaveien 10 Holding AS | Real estate | 2010 |
| Mocca Holding AS | Real estate | 1995 |
| Moe Eiendom AS | Real estate | 2020 |
| Mojtech Holding AS | Real estate | 2020 |
| Moltubakk Holding AS | | 2022 |
| Mono AS | Professional & scientific | 1990 |
| Mono Investment Consultant AS | Professional & scientific | 2000 |
| Montblesson AS | Professional & scientific | 2018 |
| Montenor Holding AS | | 2025 |
| Montenor Invest AS | | 2025 |
| Monterest AS | Construction | 2022 |
| Moon Rabbit Tattoo AS | Other services | 2023 |
| Morba Invest AS | | 2023 |
| Morten Kval AS | Construction | 1998 |