| Koan Eiendom AS | Hospitality | 2000 |
| Koan Invest AS | Hospitality | 2005 |
| Kolloen Service AS | Construction | 2013 |
| Kommerstadvegen 212 AS | Real estate | 2024 |
| Kon Invest AS | Information & communication | 2005 |
| Kongssund Invest AS | | 2023 |
| Kongsvegen Eiendom AS | Real estate | 2019 |
| Kontroll Og Sikkerhet AS | Construction | 2023 |
| KPN Utvikling AS | Real estate | 2022 |
| KR Bygg Og Montasje AS | Construction | 2021 |
| KR Byggconsult AS | Professional & scientific | 2013 |
| KR Olsen Holding AS | Construction | 2020 |
| KR Vekst AS | Financial services | 2005 |
| Kraaboel Invest AS | Financial services | 2015 |
| Krisma AS | Financial services | 2017 |
| Kristian O Elvsvebakken AS | | 2025 |
| Kristiansen Dagligvare AS | Wholesale & retail | 2023 |
| Krogstie Bygg AS | Construction | 2023 |
| Krogstie Holding AS | | 2026 |
| Krokengen AS | Real estate | 2017 |
| Krås AS | Information & communication | 2025 |
| KSH AS | | 2022 |
| Kvarberg Holding AS | Real estate | 2008 |
| Kvernmo Tak AS | Construction | 2023 |
| Kvisberg Montering AS | Construction | 2025 |
| KWJ Holding AS | Financial services | 2005 |
| Lag Eiendom AS | | 2024 |
| Landbruksbygg Innlandet AS | Construction | 2023 |
| Lars Nannestad Holding AS | Construction | 2023 |
| Lars Otto Invest AS | | 2025 |
| Larsen Gruppen AS | Real estate | 2019 |
| LB Tømrermester AS | Construction | 2020 |
| Leaf & Bloom AS | Wholesale & retail | 2025 |
| Leda Medical AS | Wholesale & retail | 1997 |
| Libakken Invest AS | Construction | 2020 |
| Libakken Service AS | Construction | 2022 |
| Libos AS | Real estate | 2021 |
| Liconsi AS | | 2024 |
| Lien Og Bjørnstad Da | Construction | 1997 |
| Lillehovde Holding AS | | 2025 |
| Lillehovde Invest AS | | 2023 |
| Linor Invest AS | | 2026 |
| Ljøsheim Eiendom AS | Real estate | 2005 |
| Lka Graving Og Vaktmester AS | Construction | 2021 |
| Lo-Ka Holding AS | | 2026 |
| Lun Invest AS | Real estate | 2021 |
| Lux Economy AS | Information & communication | 2022 |
| Lux Partner AS | Professional & scientific | 2021 |
| LV Holding AS | | 2005 |
| Lysrud Bil Og Eiendom AS | Real estate | 2007 |
| Lønseth AS | Information & communication | 2023 |
| M Grønvold AS | Construction | 1997 |
| M Helseth Holding AS | | 2026 |
| M&S Holding AS | Financial services | 2017 |
| M&U Holding AS | Construction | 2010 |
| M-Huset AS | Real estate | 1994 |
| M. Grønvold Eiendom AS | Real estate | 2005 |
| M. Grønvold Holding AS | Construction | 2005 |
| M. Hagen Holding AS | | 2024 |
| Macca Consultancy Nor Nuf | Professional & scientific | 2024 |
| Magic Moments AS | Real estate | 2020 |
| Magisk Kunnskap AS | Arts & recreation | 2021 |
| Magne Bjerke Holding AS | | 2024 |
| Maia Eiendomsutvikling AS | Real estate | 2018 |
| Maka Eiendom AS | Real estate | 1999 |
| Makan Transport AS | Transport & logistics | 2025 |
| Malmo Og Ugelstad Eiendomsservice AS | Construction | 2006 |
| Mantrax AS | Wholesale & retail | 2026 |
| Marguerite Skin Tonic AS | Wholesale & retail | 2008 |
| Mariendal AS | Real estate | 2000 |
| Markus Snekkerservice AS | Construction | 2024 |
| Maskinanlegg AS | Construction | 2019 |
| Maskinentrepenør Innlandet AS | Construction | 2019 |
| Matfatet Ringsaker AS | Hospitality | 2026 |
| Mathisen AS | Construction | 1989 |
| Mauritz Aarskog Holding AS | Real estate | 2022 |
| Mauritz Aarskog Invest AS | Real estate | 2022 |
| Max Mat AS | Wholesale & retail | 2026 |
| Maxsus AS | Wholesale & retail | 2026 |
| Maylen Rusti AS | Arts & recreation | 2024 |
| Medimind AS | Information & communication | 2025 |
| Meierigården Brumunddal AS | Real estate | 2026 |
| Mej Holding 1 AS | | 2026 |
| Mej Holding AS | Real estate | 2019 |
| Meti Holding AS | Wholesale & retail | 2012 |
| Microventures AS | | 2023 |
| Midtbyen AS | Real estate | 2006 |
| Mikla Events AS | Administrative & support | 2010 |
| Miller Holding AS | Administrative & support | 2017 |
| Minimax Maskinutleie AS | Administrative & support | 2005 |
| Miss 1 AS | Wholesale & retail | 2017 |
| Mive Eiendom AS | Real estate | 2015 |
| Mjøsa Båtservice AS | Manufacturing | 2017 |
| Mjøsa Drift AS | Wholesale & retail | 2021 |
| Mjøsa Eiendom 1 AS | Real estate | 2016 |
| Mjøsa Food Forest AS | Agriculture & fishing | 2026 |
| Mjøsa Helsehub AS | Real estate | 2026 |
| Mjøsa Holding AS | Real estate | 2016 |
| Mjøsas Pakke Og Vare Transport AS | Transport & logistics | 2024 |
| Mjøseie AS | Real estate | 2022 |