| Krefting Holding AS | | 2020 |
| L B Holding AS | Health & social care | 2005 |
| L B Kirurgi AS | Health & social care | 2026 |
| Leif Helmich Og Ingela Pedersen AS | Financial services | 1990 |
| Lightship AS | Wholesale & retail | 2005 |
| Lillenurket AS | Wholesale & retail | 2018 |
| Lim Holding AS | Financial services | 2018 |
| Lindholmen Sports AS | Education | 2026 |
| Linie Consulting AS | Health & social care | 2013 |
| Lipi Holding AS | Wholesale & retail | 2022 |
| Lommedalen Auto AS | Other services | 2002 |
| Lommedalen Blikkenslageri Og Stillasutleie AS | Construction | 1986 |
| Lommedalen Bygg AS | Construction | 1994 |
| Lommedalen Consulting AS | Information & communication | 2003 |
| Lommedalen Dagligvare AS | Wholesale & retail | 2011 |
| Lommedalen Eiendomsservice AS | Administrative & support | 2013 |
| Lommedalen Golf AS | Arts & recreation | 2001 |
| Lommedalen Vei Og Anlegg AS | Construction | 2019 |
| Lorange Støp AS | Manufacturing | 2016 |
| LPM Classic AS | Other services | 2023 |
| LPM Holding AS | Other services | 2022 |
| Lund Consulting AS | Professional & scientific | 2015 |
| Lutro Vintage AS | Wholesale & retail | 2020 |
| Løkka Gård AS | Other services | 2022 |
| Mabejo Holding AS | Other services | 2015 |
| Mads Mekker AS | Professional & scientific | 2025 |
| Maio AS | Professional & scientific | 2018 |
| Makan Holding AS | Professional & scientific | 2005 |
| Mamcap AS | | 2026 |
| Marline Offshore Solutions AS | Professional & scientific | 2016 |
| Martinius Group AS | | 2012 |
| Mateik AS | | 2024 |
| Mathea Eiendom AS | Real estate | 2011 |
| Mattisplassveien SA | Real estate | 2013 |
| MB Air Sea AS | Construction | 1998 |
| Mementomori AS | Professional & scientific | 2008 |
| Mester Tre AS | Construction | 1999 |
| Micro Logic AS | Information & communication | 2015 |
| Micro Property AS | Information & communication | 1988 |
| Midre AS | Professional & scientific | 2021 |
| Minneplater AS | Professional & scientific | 2014 |
| Mitz AS | Wholesale & retail | 2002 |
| Mjaas Invest AS | | 2025 |
| Mlvl AS | Administrative & support | 2021 |
| Modernisering AS | Construction | 2019 |
| Morlis AS | Wholesale & retail | 1998 |
| Motla Holdings AS | | 2026 |
| MPD Cloud Holding AS | | 2019 |
| MT Bygg-Service AS. | Construction | 2025 |
| Multica AS | Information & communication | 1996 |
| Myhre Konsulent AS | Professional & scientific | 1901 |
| Mørdre Sportsnett AS | Wholesale & retail | 1997 |
| Nivora AS | | 2026 |
| Nme Capital AS | | 2026 |
| Norges Rejser Aktiv Familie Ferie AS | Administrative & support | 2020 |
| Norseman AS | Real estate | 1995 |
| Norske Tjenestehunder AS | Other services | 2024 |
| Norstruct AS | Professional & scientific | 2006 |
| North Fix AS | Construction | 2019 |
| O Hagen Consult AS | Professional & scientific | 2026 |
| Odena AS | | 2016 |
| Oi Topaas AS | Transport & logistics | 2024 |
| Ole-Ludvig Akre AS | Administrative & support | 1995 |
| Olsen Skoger Ans | Agriculture & fishing | 1929 |
| Oppussing Og Rengjøring AS | Administrative & support | 2012 |
| Ose Nordic AS | Professional & scientific | 1991 |
| Oslofjorden HD Senter Ans | Wholesale & retail | 1993 |
| Oslofjorden MC Senter AS | Wholesale & retail | 2013 |
| Paulsen Invest & Management AS | Professional & scientific | 2017 |
| Peg AS | Professional & scientific | 2022 |
| Pelican AS | Financial services | 2008 |
| Pero Service AS | Other services | 2006 |
| Peters Byggservice AS | Construction | 2008 |
| Petho AS | Real estate | 2014 |
| Petter & Herman Transporttjenester AS | Transport & logistics | 2016 |
| Petter Aaserud Marketing Services AS | Professional & scientific | 2024 |
| Phetis Holding AS | | 2024 |
| Piceaabies Invest AS | | 2022 |
| PK Rør AS | Construction | 2023 |
| PL Consulting AS | Professional & scientific | 2022 |
| Pocket Valley AS | Real estate | 2005 |
| Pocket Valley Engineering AS | Professional & scientific | 2023 |
| Pocos Investor AS | Real estate | 2005 |
| Procorp Holding AS | Financial services | 2006 |
| Project Competence AS | Professional & scientific | 1990 |
| Prosjektservice AS | Professional & scientific | 2001 |
| Proton Eiendomsservice AS | Administrative & support | 2025 |
| Proton Maskin Og Utemiljø AS | Agriculture & fishing | 2019 |
| Qoop AS | Information & communication | 2025 |
| Rafmek AS | Manufacturing | 2017 |
| Ragnhild Holm - Kompetanseutvikling AS | Education | 2023 |
| Ranch Invest AS | | 2021 |
| Renhold Og Vaktmesterservice AS | Administrative & support | 2025 |
| Rogndal Holding AS | Wholesale & retail | 2019 |
| Ronaldo Holding AS | | 2024 |
| Rulten AS | | 2022 |
| Rusken Taxi AS | Water & waste | 2017 |
| RW Holding & Son AS | Professional & scientific | 2022 |
| Rønninghaugen AS | Real estate | 2017 |
| Saleslab AS | Professional & scientific | 2023 |