| Kro-Maskin AS | Construction | 2024 |
| Kroff Group Holding AS | | 2026 |
| Kvennin AS | Manufacturing | 2006 |
| Kvennin Handel AS | Wholesale & retail | 2019 |
| Kværner Eiendom Kløfta AS | Real estate | 1966 |
| L. Skaret Holding AS | | 2017 |
| Ladderudtunet AS | Real estate | 2017 |
| Laf Konsult AS | | 2021 |
| Lasse Sagdal Bygg AS | Construction | 2021 |
| Lastebil Distribusjon AS | Transport & logistics | 2023 |
| Lastebil Frakt AS | Transport & logistics | 2024 |
| LC Consult AS | Professional & scientific | 2019 |
| Lectum AS | Education | 2026 |
| Lexit Group AS | Wholesale & retail | 2005 |
| Lexit Group Norway AS | Wholesale & retail | 1998 |
| LH Anlegg Og Transport Service AS | Transport & logistics | 2021 |
| Liag AS | Wholesale & retail | 2022 |
| Lift Og Maskin AS | Wholesale & retail | 2011 |
| Lille Cafe Kløfta AS | Hospitality | 2013 |
| Lillegaard AS | Information & communication | 2022 |
| Lily Country Club AS | Hospitality | 2018 |
| Linde Agro AS | Wholesale & retail | 2022 |
| Lindström & Nilsson Norge AS | Wholesale & retail | 2010 |
| Litzheim Eiendom Og Boligutvikling AS | Construction | 2016 |
| Lmkk Holding AS | Education | 2021 |
| Lodding AS | Real estate | 2014 |
| LRK Holding AS | Wholesale & retail | 2005 |
| Lusa Holding AS | Real estate | 2002 |
| Lyckliga AS | Professional & scientific | 2018 |
| Lyngutta AS | | 2024 |
| Lyskilden AS | Wholesale & retail | 1995 |
| Låsvakten Døgnservice AS | Wholesale & retail | 2002 |
| Lønna Eiendom AS | Real estate | 2004 |
| M. G. Holding AS | Manufacturing | 2010 |
| M.N Bil AS | Wholesale & retail | 2023 |
| Maad Transport AS | Transport & logistics | 2017 |
| Malerhaugveien 19-23 AS | Real estate | 2015 |
| Malus Holding AS | Real estate | 2021 |
| Mamma Mia Barnehage AS | Education | 2008 |
| Mangfoldsbroen AS | | 2026 |
| Marit Ringstad Konsult AS | Real estate | 2015 |
| Maskiner & Pulverteknologi AS | Wholesale & retail | 1997 |
| Maskinsenterne AS | Wholesale & retail | 2013 |
| Maskinsenterne Utleie AS | Administrative & support | 2024 |
| Master Malerservice AS | Construction | 1998 |
| Mastermal Holding AS | Real estate | 2019 |
| Masteveien 3 AS | Real estate | 2024 |
| Matec AS | Manufacturing | 1999 |
| Medical AS | Education | 2020 |
| Meg Kan Du Leie AS | Administrative & support | 2018 |
| Mega Project AS | Construction | 2019 |
| Meglerhuset Øvre Romerike AS | Real estate | 2026 |
| Meie Eiendomsdrift AS | Real estate | 2008 |
| Membranekspressen AS | Construction | 2014 |
| Mestermal Romerike AS | Construction | 2015 |
| Midthus AS | Financial services | 2017 |
| Midtveien AS | Real estate | 2019 |
| Mikael Micke Lewin AS | Education | 2021 |
| Miklagard Golf AS | Arts & recreation | 1998 |
| Miklagard Golfdrift AS | Arts & recreation | 2023 |
| Miljeteig Eiendom AS | Real estate | 1999 |
| Miro International Da | Wholesale & retail | 1997 |
| Mixx AS | Wholesale & retail | 2014 |
| MK Konsulenten AS | Wholesale & retail | 2013 |
| Moderne Oppussing AS | Construction | 2021 |
| Modulgruppen AS | Construction | 2014 |
| Monk Byggentreprenør AS | Construction | 2022 |
| Morten Langli Ltd Nuf | Professional & scientific | 2011 |
| Mot Dag AS | Information & communication | 2017 |
| Motorhome & Camper Rental AS | Administrative & support | 2018 |
| MR 8 Bygg AS | Construction | 2021 |
| MR Chef Restaurant AS | Hospitality | 2025 |
| MR Elektro AS | Professional & scientific | 2014 |
| MR Elektro Drift AS | Construction | 2026 |
| MTP AS | Transport & logistics | 2018 |
| MTR Service AS | | 2019 |
| My-Ra AS | Education | 2024 |
| Myrvangveien 1 AS | Real estate | 2019 |
| Nafstad Autosenter Ans | Wholesale & retail | 1988 |
| Nafstads Landbruksverksted Ans | Real estate | 1992 |
| Nathalie Parfymeri AS | Wholesale & retail | 2021 |
| NB Tech AS | Information & communication | 2024 |
| Neglemannen AS | Other services | 2014 |
| Neng Analysis AS | Professional & scientific | 2024 |
| Neoety AS | Professional & scientific | 2021 |
| Neri Bygg AS | Construction | 2018 |
| Neste Kapittel Group AS | Professional & scientific | 2023 |
| Newbie Trafikkskole AS | Education | 2024 |
| Next Hole Golfdrift AS | Arts & recreation | 2022 |
| Next Hole Travel AS | Administrative & support | 2017 |
| Niska AS | Construction | 2017 |
| Nittedal Utvikling AS | Real estate | 1995 |
| No Mas AS | | 2022 |
| Nodea AS | Information & communication | 2026 |
| Nor-Tom AS | Construction | 2022 |
| Norami Catering AS | Hospitality | 2024 |
| Nord Maskin Og Eiendom AS | Real estate | 2018 |
| Nordbrenden Graving Og Transport AS | Construction | 2024 |
| Norden Bygg AS | Construction | 2019 |
| Nordermoen Group AS | Real estate | 2019 |