| Ledelse Organisasjon Selvutvikling Da | Professional & scientific | 2001 |
| Leesland Apartments AS | Real estate | 2021 |
| Legespesialist Og Kirurgi Praksis AS | Health & social care | 2025 |
| Legner of Scandinavia AS | Wholesale & retail | 2023 |
| Leithe Elektro AS | Construction | 2002 |
| Lekelande AS | Arts & recreation | 2024 |
| Lemica AS | Real estate | 2006 |
| Les Baguette AS | Hospitality | 2017 |
| Lex Bygg AS | Construction | 2025 |
| Lex Gruppen AS | | 2026 |
| LHL Holding AS | Real estate | 2023 |
| Liamyrene 3 AS | Real estate | 2006 |
| Liger Watches AS | Wholesale & retail | 2020 |
| Lignum Invest AS | | 2024 |
| Limoli AS | Information & communication | 2022 |
| Lingonvien AS | | 2025 |
| LLL Hår & Kosmetikk AS | Other services | 2023 |
| LMS Advisory AS | Professional & scientific | 2024 |
| Loan Dieu Eiendom AS | Real estate | 2022 |
| Loan Dieu Holding AS | | 2023 |
| Logimex AS | Transport & logistics | 2013 |
| Lol Holding AS | Wholesale & retail | 2015 |
| Looping AS | Manufacturing | 2017 |
| Lorentsen Proff Maling AS | Construction | 2026 |
| Losby Gods Eiendom AS | Real estate | 1989 |
| Losby Golfbygg AS | Real estate | 1990 |
| Lotbinvest AS | | 2016 |
| Lotus Asian Cuisine AS | Hospitality | 2019 |
| Ltacos AS | Hospitality | 2020 |
| Lucas Smebøle AS | Education | 2026 |
| Luhrtoppen AS | Arts & recreation | 2018 |
| Luhrtoppen Eiendom AS | Real estate | 2019 |
| Lumi Design AS | Wholesale & retail | 2026 |
| Luna Familiebarnehage Skårer AS | Education | 2022 |
| Lund Bygg Lillestrøm AS | Construction | 2016 |
| Lund Graveservice AS | Construction | 2021 |
| Lykelly AS | Wholesale & retail | 2024 |
| Lyly Nails & Spa AS | Other services | 2019 |
| Lyreco Norge AS | Wholesale & retail | 1971 |
| Lyymp AS | Information & communication | 2010 |
| LÅS1 Sikkerhet AS | Manufacturing | 2016 |
| Læringsmiljøsenter AS | Education | 2025 |
| Lørenskog Auto Care AS | Other services | 2013 |
| Lørenskog Bakeri AS | Manufacturing | 2025 |
| Lørenskog Bandasje AS | Wholesale & retail | 1999 |
| Lørenskog Bilshine Ans | Other services | 2005 |
| Lørenskog Bilverksted AS | Other services | 2024 |
| Lørenskog Catering AS | Hospitality | 2014 |
| Lørenskog Dagligvarer AS | Wholesale & retail | 2025 |
| Lørenskog Distribusjon Og Lager AS | Transport & logistics | 2005 |
| Lørenskog Dyrebutikk Avd Vestparken AS | Wholesale & retail | 2025 |
| Lørenskog Eiendom AS | Real estate | 2017 |
| Lørenskog Eiendomsmegling AS | Real estate | 2002 |
| Lørenskog Fysioterapi Og Osteopati AS | Health & social care | 2014 |
| Lørenskog Gastroklinikk AS | Health & social care | 2013 |
| Lørenskog Helsekost AS | Wholesale & retail | 2018 |
| Lørenskog I Utvikling SA | Other services | 2022 |
| Lørenskog Invest AS | | 2009 |
| Lørenskog Kampsportsenter AS | Arts & recreation | 2021 |
| Lørenskog Klima AS | Construction | 2022 |
| Lørenskog Leker AS | Wholesale & retail | 2015 |
| Lørenskog Medisinske Senter AS | Health & social care | 2021 |
| Lørenskog Renhold & Service AS | Administrative & support | 1986 |
| Lørenskog Rørleggerbedrift AS | Construction | 1984 |
| Lørenskog Senter AS | Real estate | 2006 |
| Lørenskog Sushi Og Wok AS | Hospitality | 2024 |
| Lørenskog Tannlegesenter AS | Health & social care | 2017 |
| Lørenskog Ur Og Gull AS | Wholesale & retail | 2002 |
| Lørenskog Øyeklinikk AS | Health & social care | 2013 |
| Lørenskogmegleren AS | Real estate | 2022 |
| Lørenskog Zoosenter AS | Wholesale & retail | 1988 |
| M Drive AS | Transport & logistics | 2025 |
| M&T Holding AS | | 2020 |
| M.A.C Holding AS | Financial services | 2015 |
| M.N.N AS | Construction | 2022 |
| M.S.K. Holding AS | Financial services | 2015 |
| Maclouise Ans | | 1993 |
| Mad Cat Creative Consulting AS | Arts & recreation | 2021 |
| Madry AS | Other services | 2026 |
| Madsul Eiendom AS | Real estate | 2023 |
| Magenta Technology Partner Da | Wholesale & retail | 2001 |
| Magic AS | Professional & scientific | 2024 |
| Magnusklova Vann- Og Avløpslag SA | Real estate | 2018 |
| Magsense Ans | Wholesale & retail | 2001 |
| Mailandveien 10 AS | Real estate | 2006 |
| Malcon AS | Professional & scientific | 2016 |
| Malerbygg AS | Construction | 2012 |
| Malermester Johannessen AS | Construction | 2007 |
| Malin Lauritzen AS | | 2026 |
| Malmin AS | Professional & scientific | 2018 |
| Mammut Sports Group AS | Wholesale & retail | 1996 |
| Manroland Nordic Norge AS | Wholesale & retail | 1994 |
| Marabella Pizza Bakeri AS | Hospitality | 2021 |
| Marama Spill AS | Arts & recreation | 1997 |
| Marcel Bygg Og Renhold AS | Construction | 2023 |
| Marcus Thranes Vei 100 AS | Professional & scientific | 2010 |
| Maritime Projects AS | Professional & scientific | 2018 |
| Mariusz Kozinski | Construction | 2011 |
| Marmina AS | Construction | 2022 |
| Mateusz Holding AS | Professional & scientific | 2019 |