| Kase AS | Education | 2021 |
| Kaspara Boligstyling & Interiør AS | Professional & scientific | 2018 |
| KBV Norge AS | Professional & scientific | 2003 |
| Kebe Invest AS | Financial services | 2005 |
| Kesko Eiendom AS | Real estate | 2005 |
| Kesko Eiendom Bergen AS | Real estate | 2005 |
| Key Capital AS | Real estate | 2007 |
| Key Group AS | Real estate | 2018 |
| Key Holdings AS | Real estate | 2023 |
| Key Hotels AS | Hospitality | 2018 |
| Key Partners AS | Real estate | 2007 |
| Key Property AS | Real estate | 2010 |
| Key Trading AS | Real estate | 2008 |
| Ki Eksperten Norge AS | Information & communication | 2025 |
| Kichan's Easy Steps AS | Professional & scientific | 2012 |
| Kif Trading AS | Wholesale & retail | 2021 |
| Kilstad Holding AS | Real estate | 2017 |
| Kim-David Eriksen Fotografi AS | Professional & scientific | 2015 |
| Kinnlimarka 34 AS | Real estate | 2025 |
| Kjell Arne Invest AS | Real estate | 2005 |
| Kjell Brustad AS | Professional & scientific | 2002 |
| Kjelledin Holding AS | Financial services | 2018 |
| Kjeller Modellverksted AS | Manufacturing | 1988 |
| Kjellgren Invest AS | Real estate | 2021 |
| Kjellgren Investment Limited Nuf | | 2010 |
| Kjetil & Geir Vaktmesterservice Da | Administrative & support | 1995 |
| Klar Rekruttering AS | Administrative & support | 2016 |
| Konseptpartner AS | Information & communication | 2021 |
| Kreativ Utvikling AS | Real estate | 2015 |
| Kronborg Invest AS | | 2026 |
| Kronborg Juridisk AS | Professional & scientific | 2026 |
| Krøsus Holding AS | | 2015 |
| Ksha Holding AS | Hospitality | 2023 |
| Ksrana AS | Hospitality | 2023 |
| Ksts Holding AS | | 2026 |
| KTJ Holding AS | Real estate | 2022 |
| KTS Consult AS | Professional & scientific | 2014 |
| Kvikai AS | Information & communication | 2023 |
| L&E Service Da | Other services | 2005 |
| L&L Invest AS | Professional & scientific | 2009 |
| Laamrigg AS | Financial services | 2005 |
| Lahaugmoen Hundesenter AS | Other services | 2016 |
| Lale Holding AS | Professional & scientific | 2020 |
| Lampehuset Holding AS | Wholesale & retail | 1990 |
| Lanza AS | | 2025 |
| LD Media AS | Arts & recreation | 2021 |
| Leadsuccesses AS | Education | 2024 |
| Lefam Invest AS | | 2019 |
| Len Nail Art AS | Other services | 2023 |
| Leonda AS | Education | 2019 |
| Leren Consulting AS | Professional & scientific | 2021 |
| Lev Mye AS | Financial services | 2005 |
| Lighthouse Holding AS | | 2026 |
| Lille Papillon AS | Professional & scientific | 2010 |
| Lillestrøm Leietransport AS | Administrative & support | 2013 |
| Limitless AS | Wholesale & retail | 2024 |
| Linerla AS | Professional & scientific | 2020 |
| Liroma AS | Wholesale & retail | 2009 |
| Liskarph Holding AS | | 2021 |
| Litma Future Da | Professional & scientific | 2004 |
| Livia Group AS | Health & social care | 2026 |
| Lje Invest AS | Financial services | 2005 |
| LM Drift Da | Construction | 2004 |
| LMR Bygg & Vedlikehold AS | Construction | 2018 |
| Loge Montering AS | Construction | 2013 |
| Logistikkhuset PLD AS | Administrative & support | 1997 |
| Loupeen Consulting AS | Information & communication | 2020 |
| Ltoften Holding AS | | 2025 |
| Lubeco AS | Wholesale & retail | 1989 |
| Lundgrens Norge AS | Wholesale & retail | 1971 |
| Luth Gruppen AS | Wholesale & retail | 1964 |
| Luth Holding AS | Wholesale & retail | 1981 |
| Luxrus Design AS | Professional & scientific | 2014 |
| Lysbutikken.No AS | Wholesale & retail | 2011 |
| Låsesmeder Oslo AS | Other services | 2022 |
| Løken Holding AS | Real estate | 1998 |
| Løvberg Øines Eiendom Da | Real estate | 1995 |
| M Beauty AS | Other services | 2026 |
| M.R Autohawk AS | Wholesale & retail | 2018 |
| Ma Consulting Oslo AS | Real estate | 2014 |
| Mackt AS | | 2015 |
| Magnar Ruud Invest AS | | 2023 |
| Mahar Anwar Gruppen AS | Wholesale & retail | 2015 |
| Malemi AS | Professional & scientific | 2019 |
| Malerfirma Åge Karlsen AS | Construction | 1996 |
| Malervakt AS | Construction | 2022 |
| Mari Company AS | Administrative & support | 2017 |
| Market Surveillance AS | Professional & scientific | 2006 |
| Marketconnect AS | Professional & scientific | 2024 |
| Martvald AS | Financial services | 2018 |
| Maskeraden Strikkeri Da | Manufacturing | 1989 |
| MB Bil AS | Wholesale & retail | 2016 |
| MC Partner Service Og Utleie AS | Wholesale & retail | 1994 |
| MC Service AS | Other services | 2022 |
| MD Eiendom AS | Construction | 2017 |
| Medi-Tools AS | Wholesale & retail | 2014 |
| Mednordic AS | Wholesale & retail | 2013 |
| Mehran Azimi Holding AS | Transport & logistics | 2023 |
| Mel Heia 35 AS | Real estate | 2022 |
| Mel Heia 41 AS | Real estate | 2022 |