| J.S Entreprenør AS | Construction | 2022 |
| Ja Berg Invest AS | | 2022 |
| Janny Beauty AS | Other services | 2025 |
| JJ Handel AS | | 2024 |
| Jomasa AS | Health & social care | 1998 |
| JS Snekker AS | Construction | 2022 |
| Jøsang Invest AS | | 2021 |
| K. Bull Drammen AS | Administrative & support | 2026 |
| K. Bull Eiendom AS | Real estate | 2018 |
| K. Bull Holding AS | Real estate | 2012 |
| K. Bull Maskin AS | Wholesale & retail | 2011 |
| K.R Holding AS | Professional & scientific | 2012 |
| Kaga Holding AS | | 2022 |
| Kalas Norge AS | Wholesale & retail | 2023 |
| Kalmar Norway AS | Wholesale & retail | 2014 |
| Kampenhaug Holding AS | Hospitality | 2012 |
| Kanmac AS | Professional & scientific | 2007 |
| Karl Storz Endoskopi Norge AS | Wholesale & retail | 2008 |
| Karlsen & Nordseth AS | Construction | 1990 |
| Karlsen & Nordseth Entreprenør AS | Construction | 2002 |
| Karlsen Aktiv AS | Real estate | 2007 |
| Karlssons Grave Og Vedlikehold AS | Construction | 2001 |
| Karlssons Maskin Og Eiendom AS | Manufacturing | 1977 |
| Karu Invest AS | | 2014 |
| Kav & Jot Invest AS | Manufacturing | 2023 |
| KB Blikk AS | Construction | 2014 |
| KB Blikk Holding AS | Real estate | 2004 |
| Kde Invest AS | | 2025 |
| Kent Bull Holding AS | Real estate | 2012 |
| Kesja AS | Other services | 2026 |
| KF Invest Rental SA | Administrative & support | 1995 |
| KFP Holding AS | Financial services | 2017 |
| Kifs AS | Financial services | 2005 |
| Kjeldsen Holding AS | | 2022 |
| Kjeller Forsikringsmegling AS | Financial services | 2011 |
| Kjetil Nilsen Holding AS | Real estate | 2010 |
| Kjønø Holding AS | Financial services | 2010 |
| Kolibri Studio AS | Professional & scientific | 2025 |
| Kris Warchol AS | Construction | 2020 |
| Kristian Ranheim Holding AS | | 2022 |
| Kroppen Vet AS | Health & social care | 2025 |
| Kuli Klimateknikk AS | Construction | 2022 |
| Kurseth Fraise Holding AS | Real estate | 2019 |
| L-M Granly Invest AS | Wholesale & retail | 2011 |
| Ladakh AS | Real estate | 2005 |
| Ladegården Kro AS | Hospitality | 2023 |
| Landia Norge AS | Wholesale & retail | 2017 |
| Lanent Invest AS | | 2021 |
| Lavida Vu Frisør AS | Other services | 2011 |
| Le-Bra Holding AS | | 2021 |
| Leif Olav Alnes AS | | 2025 |
| Lek AS | | 2022 |
| Lianco Ltd AS | Real estate | 1946 |
| Likelaila AS | Hospitality | 2025 |
| Likollen AS | Financial services | 2014 |
| Lima Foto AS | Professional & scientific | 2014 |
| Limka AS | | 2024 |
| Lindam AS | Construction | 2017 |
| Lisbeth Kreative Verden AS | Wholesale & retail | 2022 |
| Lit - Nor AS | Construction | 2018 |
| LJ Ressurs AS | Professional & scientific | 2020 |
| Logisnext Norway AS | Wholesale & retail | 2000 |
| Lokal Tradisjonsmat AS | Wholesale & retail | 2024 |
| Lumi Accounting AS | Professional & scientific | 2025 |
| Lumier AS | Wholesale & retail | 2012 |
| Lunde Gruppen AS | | 2019 |
| Lyt AS | Information & communication | 2023 |
| Løft Invest AS | Construction | 2019 |
| Løiten Brænderis Destillation Ans | Manufacturing | 2000 |
| Magnus Solstad AS | | 2022 |
| Makeit AS | | 2005 |
| Malatoga AS | Real estate | 2016 |
| Maria Sunde Holding AS | | 2024 |
| Maroli Holding AS | | 2016 |
| Masteveien 1 AS | Real estate | 2001 |
| Masteveien 10 Hagan AS | Real estate | 1985 |
| Mawo Invest AS | Construction | 2023 |
| Maxdrive Automotive AS | Wholesale & retail | 2025 |
| MC Clean Holding AS | Administrative & support | 1998 |
| Medema Norge AS | Wholesale & retail | 1993 |
| Medema-Gruppen AS | Wholesale & retail | 2005 |
| Medical Recruitment and Staffing AS | Administrative & support | 2019 |
| Mediehuset Andvord AS | Manufacturing | 1960 |
| Mem Kapital AS | | 2022 |
| Mentor Media Holding AS | Professional & scientific | 2005 |
| Mercury AS | Transport & logistics | 2018 |
| Metrix Invest AS | Real estate | 2016 |
| MGT Regnskap AS | Professional & scientific | 2013 |
| Midt-Norge Industrirøntgen AS | Professional & scientific | 1985 |
| Mikkel AS | Real estate | 2006 |
| Minnisoftware AS | Information & communication | 2026 |
| Mo Matglede AS | Hospitality | 2019 |
| Modulez AS | Information & communication | 2000 |
| Moma Design Da | Professional & scientific | 2008 |
| Morek AB | Wholesale & retail | 2015 |
| Morek AS | Wholesale & retail | 1991 |
| Morten Solberg Invest AS | Construction | 2005 |
| Mortens Kro AS | Hospitality | 1986 |
| Mpfc AS | Construction | 2019 |
| MS Prosjekt AS | Construction | 2017 |