| M Trade AS | Wholesale & retail | 2024 |
| M.B Consulting AS | Wholesale & retail | 2013 |
| Majas Kulturservice AS | Manufacturing | 2022 |
| Mannblikk Buskerud AS | Construction | 2017 |
| Manuellterapi Og Ultralyd AS | Health & social care | 2015 |
| Marco AS | Professional & scientific | 2001 |
| Masera Invest AS | | 2020 |
| Maskinentreprenør Sølve Bogen AS | Construction | 2025 |
| Massivhus AS | Real estate | 2014 |
| Matbua Eiendom AS | Wholesale & retail | 1967 |
| MCL Eiendom AS | Real estate | 2025 |
| MCL Eiendom Holding AS | Real estate | 2025 |
| Melsinelec AS | Professional & scientific | 2020 |
| Menings- Og Mestringsgården AS | Health & social care | 2017 |
| Mhconsult AS | Information & communication | 2023 |
| MHH AS | Information & communication | 2023 |
| MKJ Invest AS | Real estate | 2017 |
| Moann Byggtjenester AS | Construction | 2020 |
| Mogeto AS | Real estate | 2016 |
| Mpa Holding AS | Financial services | 2013 |
| MV Elektrotavler AS | Construction | 2024 |
| Myrhetta Holding AS | | 2025 |
| Møllefossen Barnehage AS | Education | 2006 |
| Nei Takst AS | Construction | 2019 |
| Ni-Ma AS | Real estate | 2011 |
| Nikkerud Transport AS | Transport & logistics | 2023 |
| Nimco AS | Wholesale & retail | 2021 |
| Nordre Hamre AS | Real estate | 2022 |
| Norsk Miljøflis AS | Manufacturing | 2014 |
| Notting Holding AS | Construction | 2018 |
| Oam Holding AS | Arts & recreation | 2022 |
| Oasa AS | Professional & scientific | 2019 |
| Oasa Entreprenør AS | Construction | 2021 |
| Omo Holding AS | Professional & scientific | 2004 |
| Omsetningen AS | Information & communication | 2024 |
| Onglebu AS | Financial services | 2022 |
| Open Art Market AS | Arts & recreation | 2022 |
| Orhagen AS | Information & communication | 2022 |
| Orkidehøgda SNR 35 AS | Real estate | 2025 |
| Orkidehøgda SNR 36 AS | Real estate | 2025 |
| Ormåsen Eiendom AS | Real estate | 2016 |
| Osi AS | Transport & logistics | 2006 |
| Panto AS | | 2020 |
| Papayainvest AS | | 2025 |
| Patagonisk Gulv AS | Wholesale & retail | 2025 |
| Per Erik Kristoffersen Holding AS | Real estate | 2019 |
| Poortman AS | Real estate | 2012 |
| Prestvannsveien Veilag SA | Real estate | 1986 |
| Pro Team Norge AS | Manufacturing | 1996 |
| Proff Tak Og Blikk AS | Construction | 2019 |
| Psykologspesialist Cindy Berger AS | Health & social care | 2012 |
| Queen V Beauty AS | Wholesale & retail | 2023 |
| Rabbit Runway Holding AS | | 2025 |
| Re Nilsen Holding AS | | 2014 |
| Reborn Rebel AS | Wholesale & retail | 2022 |
| Reiersrud Invest AS | Agriculture & fishing | 2018 |
| Rekve Invest AS | | 2024 |
| Rih Bioenergi AS | Energy | 2022 |
| Rih Eiendom AS | Real estate | 2025 |
| RM Industriservice AS | Manufacturing | 2012 |
| Roar L. J. Eiendom AS | Real estate | 2013 |
| Roastorm Bygg AS | Construction | 2012 |
| Robert Holtungen AS | | 2005 |
| Rock for Kidsa AS | Arts & recreation | 2021 |
| RS Økonomi AS | | 2024 |
| Rune Isachsen Holding AS | Construction | 2005 |
| Ruud Transport AS | Transport & logistics | 2022 |
| Rype's Mekaniske Verksted AS | Real estate | 2006 |
| Rypeng Eiendom AS | Real estate | 1997 |
| Røkeberg Kultur- Og Naturbarnehage SA | Education | 2004 |
| Røkeberg Skole Drift Ba | Administrative & support | 2005 |
| Røkebergsida Utmarkslag SA | Arts & recreation | 1983 |
| Rør Og Maskin AS | Manufacturing | 2007 |
| Salgsboost AS | Professional & scientific | 2026 |
| Sande Veterinærtjenester AS | Professional & scientific | 2025 |
| Sandsopp Holding AS | | 2026 |
| Scott Finans AS | Wholesale & retail | 2005 |
| SGW Eiendom AS | Real estate | 2008 |
| Shine Fashion AS | Wholesale & retail | 2016 |
| Showerthoughts AS | | 2025 |
| Silje Weum Holding AS | | 2023 |
| Sirikjerkeveien SA | Real estate | 1982 |
| Sjokolade Salongen AS | Manufacturing | 2002 |
| Skarra AS | Real estate | 2005 |
| Skjaves AS | | 2024 |
| Skjoldhorne AS | Construction | 2020 |
| Skjæves Holding AS | | 2024 |
| Skogsbilveglaget Jungerveien | Real estate | 1955 |
| Skogsbilveien Hamre SA | Real estate | 2025 |
| Skron AS | | 2025 |
| Skycon AS | Real estate | 2026 |
| Smart Parkering AS | Wholesale & retail | 2006 |
| Smart Vision AS | Information & communication | 2025 |
| Smybekk AS | | 2024 |
| Smørgrav Eiendom AS | Real estate | 2007 |
| Smørgrav Sag AS | Wholesale & retail | 1990 |
| Smørgrav Samdrift Da | Agriculture & fishing | 1995 |
| Solbakken Consulting AS | Wholesale & retail | 2021 |
| Spæren Eiendom AS | Real estate | 1987 |
| SR Gjøen AS | Financial services | 2015 |