| Kulvetech AS | | 2024 |
| Kulvis AS | Information & communication | 2014 |
| Kvartalet Frisør AS | Other services | 2005 |
| Kvinnelegen I Hedmark AS | Health & social care | 2013 |
| Kæru AS | | 2020 |
| L.Kristoffersen Invest AS | | 2024 |
| Labyrinten Legesenter Da | Health & social care | 2007 |
| Lars Bjølseth AS | Wholesale & retail | 2016 |
| Lars Hammeren Holding AS | | 2021 |
| Last Viking Green Food Norway AS | Wholesale & retail | 2019 |
| Legoklossen AS | Real estate | 2020 |
| Leiret Drift AS | Other services | 2021 |
| Leiret Eiendom AS | Real estate | 2001 |
| Leiret Holding AS | Professional & scientific | 2021 |
| Ligonja Holding AS | Professional & scientific | 2020 |
| Lillebakken Eiendom AS | Real estate | 2013 |
| Limeyfy AS | Real estate | 2022 |
| Lindberget Eiendom AS | Real estate | 2013 |
| Lindberget Invest AS | Professional & scientific | 2010 |
| Lindegård Holding AS | | 2023 |
| Lisjøveien SA | Real estate | 1976 |
| Lnkify AS | Information & communication | 2021 |
| Lokket Eiendom AS | Real estate | 2026 |
| Lokpersonal AS | Administrative & support | 2025 |
| Luft Og Miljøteknikk AS | Administrative & support | 1988 |
| Lund Eiendom Invest AS | Real estate | 2022 |
| Lundby Maskin AS | Construction | 2018 |
| Lunkefamilien AS | Real estate | 2016 |
| Lunkegården AS | Real estate | 2016 |
| Lås & Sikring AS | Wholesale & retail | 1992 |
| Lærerbygget AS | Households | 1946 |
| Løkken Eiendom AS | Real estate | 2015 |
| Løten Møbelsenter AS | Wholesale & retail | 2000 |
| Løvbergsmoen Eiendom AS | Real estate | 2016 |
| Løwenfjeld AS | Real estate | 2021 |
| M14 Eiendom AS | Real estate | 2018 |
| Madame Chic AS | Wholesale & retail | 1977 |
| Magneban AS | Real estate | 2015 |
| Magnolia Cafè & Catering AS | Hospitality | 2026 |
| Magnus Norum Holding AS | | 2021 |
| Maison Holding AS | | 2026 |
| Makra AS | Wholesale & retail | 2024 |
| Makri Eiendom AS | Real estate | 2019 |
| Maler Lars Invest AS | | 2018 |
| Maler Trond Invest AS | | 2017 |
| Malm Panorama AS | | 2025 |
| Mamoz Holding 1 AS | | 2005 |
| Manis Ege AS | Hospitality | 2016 |
| Marcar AS | Construction | 2016 |
| Marihøna Blomster AS | Wholesale & retail | 2024 |
| Marius Norum Holding AS | Real estate | 2017 |
| Markus AS | Real estate | 1988 |
| Martin M Bakken AS | Construction | 1983 |
| Matja AS | | 2023 |
| Maut Holding AS | Professional & scientific | 2020 |
| Meglerhuset Østlandet AS | Real estate | 2018 |
| Mellembakken Trafikkskole AS | Education | 2017 |
| Mellembakken Utleie AS | Real estate | 2020 |
| Mennt AS | Information & communication | 2020 |
| Mennt Holding AS | | 2023 |
| Mennt Sverige AS | | 2023 |
| Mester Bygg Elverum AS | Construction | 1996 |
| Mestermur AS | Real estate | 2016 |
| Mestermur Eiendom AS | Real estate | 2008 |
| Mestra Entreprenør AS | Real estate | 2000 |
| MHT Hauge AS | Real estate | 1993 |
| Mic Dental AS | Wholesale & retail | 2011 |
| Midtskogen Eiendom AS | Real estate | 2026 |
| Midtskogen Holding AS | Construction | 2015 |
| Midtskogen Maskin AS | Construction | 2015 |
| Milada AS | Health & social care | 2018 |
| Milano Elverum Aykut AS | Hospitality | 2015 |
| Militærveien AS | Real estate | 2012 |
| Millennium Cafe AS | Hospitality | 2014 |
| Minel Elmontasje Elverum AS | Construction | 1998 |
| Minne Utbygging AS | Real estate | 1998 |
| Mireid Invest AS | Financial services | 2017 |
| Mittelverum.No AS | Information & communication | 2025 |
| Mka Rådgivning AS | Professional & scientific | 2021 |
| Mobe AS | Wholesale & retail | 2019 |
| Mobekk AS | Real estate | 2020 |
| Mobergsveiene SA | Real estate | 1992 |
| Mobil Hydraulikk AS | Manufacturing | 1986 |
| Mobile Elverum AS | Wholesale & retail | 2017 |
| Mode Elektro AS | Construction | 2026 |
| Moe Vedutsalg Knut Henrik Og Per Henrik Moe Ans | Agriculture & fishing | 1997 |
| Mogopveien AS | Real estate | 2020 |
| Mortens Data Ans | Wholesale & retail | 2004 |
| Mosnes Holding AS | | 2022 |
| Motherland Tattoo AS | Other services | 2024 |
| Movies on War AS | Arts & recreation | 2014 |
| MRT Bredbåndstjenester AS | Construction | 2017 |
| MS Nordic Enterprises AS | Wholesale & retail | 2025 |
| Myhren Consulting AS | Wholesale & retail | 2021 |
| Mætti AS | Construction | 2024 |
| Møbeleiendom AS | Wholesale & retail | 2003 |
| Møllersen Holding AS | Financial services | 2012 |
| Na Skaret Consulting AS | Professional & scientific | 2019 |
| Na Skaret Holding AS | Professional & scientific | 2019 |
| Nad-Boost Norge AS | Wholesale & retail | 2025 |