| Krokfors Fritidsområde AS | Real estate | 2003 |
| Krokhåjen Service AS | Professional & scientific | 2024 |
| Krona På Verket AS | Wholesale & retail | 2022 |
| Krone AS | Other services | 2013 |
| Krutå Holding AS | Real estate | 2001 |
| KSM Nord AS | Transport & logistics | 2015 |
| Ktbsen AS | Information & communication | 2022 |
| KTM Invest AS | Wholesale & retail | 2012 |
| Kulseng Holding AS | Health & social care | 2021 |
| Kultur Og Vekst AS | Hospitality | 2000 |
| Kunnskapsingeniørene Teroplan AS | Information & communication | 1992 |
| Kunnskapsparken Helgeland AS | Professional & scientific | 2002 |
| Kurt Olsen Holding AS | | 2025 |
| Kvantek AS | Professional & scientific | 1999 |
| Kvarøy Smolt AS | Agriculture & fishing | 1996 |
| Kvikk Administrasjon AS | Professional & scientific | 2005 |
| Kvikk Eiendom Rana AS | Real estate | 2008 |
| Kvikk Renhold AS | Administrative & support | 1996 |
| Kvikk Vask & Rens AS | Other services | 2008 |
| Kvitforsen AS | | 2021 |
| Kvitsteindalen Bygg AS | Construction | 2024 |
| Kvitsteindalen Eiendom AS | Administrative & support | 2024 |
| Kvitsteindalen VVS AS | Construction | 2025 |
| Kynsveen Invest AS | | 2026 |
| Kystanlegg AS | Construction | 2022 |
| Kystpadling Ans | Education | 2021 |
| Køb AS | Arts & recreation | 2024 |
| L P S Holding AS | Real estate | 2007 |
| L.Ø Solbakken Holding AS | | 2021 |
| L42 Holding AS | | 2022 |
| La Holding Mo AS | Real estate | 2005 |
| Lagerveien 17 Rognan AS | Real estate | 2023 |
| LAKK1 AS | Other services | 2013 |
| Lamha 182 Holding AS | | 2023 |
| Langneset Autosenter AS | Wholesale & retail | 2003 |
| Lars Meyersgate 29 AS | Real estate | 2017 |
| Larsson & Røssvoll Skogsentrepenører Ans | Agriculture & fishing | 1995 |
| Laserbygg- AS | Construction | 2023 |
| Laupstad AS | Agriculture & fishing | 2023 |
| Lb-Holding AS | | 2022 |
| LBM Holding AS | | 2021 |
| Lean Byggservice AS | Construction | 2023 |
| Lege Tina Bakkejord AS | Health & social care | 2012 |
| Legend Holding AS | | 2021 |
| Lemo Drift AS | Administrative & support | 2017 |
| Lemoen Holding AS | | 2020 |
| Leya AS | Other services | 2017 |
| LGD AS | Arts & recreation | 2012 |
| Lias Eiendom AS | Real estate | 2019 |
| Lie-Dahl Holding AS | | 2020 |
| Lifjell AS | | 2023 |
| Linder AS | Transport & logistics | 2018 |
| Linder Invest AS | Professional & scientific | 2026 |
| Line Nikolaisen Fysioterapi AS | Health & social care | 2023 |
| Litbygg Eiendom AS | Real estate | 2012 |
| Litbygg Mo AS | Construction | 2016 |
| LKF AS | Wholesale & retail | 2024 |
| LKR Holding AS | | 2024 |
| LMH Holding AS | Financial services | 2013 |
| LOCAT3D AS | Information & communication | 2022 |
| Loe Butikkene AS | Wholesale & retail | 1993 |
| Loe Eiendom AS | Real estate | 2002 |
| Lofthus AS | Professional & scientific | 2010 |
| Logist AS | Real estate | 2021 |
| Lokal AS | | 2025 |
| Losvik Eiendom AS | Real estate | 2012 |
| LPL AS | Administrative & support | 2023 |
| LPL2 AS | Transport & logistics | 2025 |
| Ltcm AS | Professional & scientific | 2020 |
| Luggen Herrefrisør AS | Other services | 2006 |
| Luna Eiendom Mo AS | Transport & logistics | 2012 |
| Luna Holding AS | Transport & logistics | 1997 |
| Lund Produkter AS | Professional & scientific | 2026 |
| Lyngås Invest AS | | 2023 |
| Løkaas AS | Wholesale & retail | 1996 |
| Lønnum Gartneri & Blomsterforretning AS | Agriculture & fishing | 1985 |
| M Høgås Holding AS | | 2022 |
| M Lein Holding AS | | 2021 |
| M Økonomi AS | Professional & scientific | 2013 |
| M. H. Hanssen AS | | 2021 |
| Magama AS | | 2021 |
| Magnhus AS | Real estate | 1998 |
| Magnimaster Forlag AS | Information & communication | 2009 |
| Maiden Norway Da | Arts & recreation | 2018 |
| Makeva AS | | 2023 |
| Maltor Holding AS | | 2023 |
| Malus Eiendom AS | Administrative & support | 2014 |
| Margh AS | Real estate | 2021 |
| Marsagd Holding AS | | 2022 |
| Marthan AS | Financial services | 2018 |
| Martini-Holding AS | Wholesale & retail | 2022 |
| Martinussen Eiendom AS | Real estate | 2013 |
| Masonite Beams AS | Manufacturing | 2020 |
| Mattima Films AS | Information & communication | 2018 |
| Mattima Films Da | Information & communication | 2012 |
| Mattson Invest AS | | 2018 |
| Matura AS | Professional & scientific | 2005 |
| Mba Entreprenør AS | Construction | 2006 |
| Mba-Holding AS | Construction | 2022 |
| MBH Engros AS | Wholesale & retail | 2025 |