| Modum Maskin Consult AS | Manufacturing | 2025 |
| Modum Prosjekt Og Byggeledelse AS | Professional & scientific | 2012 |
| Modum Regnskap AS | Professional & scientific | 1986 |
| Modum Regnskapskontor AS | Professional & scientific | 2024 |
| Modum Regnskapskontor SA | Professional & scientific | 1952 |
| Modum Skisenter AS | Arts & recreation | 2011 |
| Modum Såpe Engros AS | Administrative & support | 2002 |
| Modum Tekstiltrykk AS | Manufacturing | 2000 |
| Modumgarasjen AS | Construction | 2025 |
| Monett AS | Wholesale & retail | 1976 |
| Money for Nothing AS | | 2025 |
| Monsterfangst AS | Administrative & support | 2025 |
| Morten Strand Anleggsservice AS | Construction | 2022 |
| Morud AS | | 2015 |
| Morud Eiendom AS | Real estate | 2005 |
| Morud Florida AS | Real estate | 2021 |
| Morud Minerals AS | Real estate | 1990 |
| Morud Skog Da | Agriculture & fishing | 2008 |
| Moviken Entreprenør AS | Construction | 2013 |
| Mrtn Holding AS | Information & communication | 2020 |
| MSK Konsulenten AS | Professional & scientific | 2016 |
| Muligheter AS | Real estate | 2007 |
| Mårveien Holding AS | Construction | 2021 |
| N-H Invest AS | Wholesale & retail | 2019 |
| Natvedt AS | Hospitality | 2016 |
| Nebell Holding AS | Financial services | 2018 |
| Nedmarken Eiendom AS | Real estate | 2020 |
| Nedmarken Kafe & Catering AS | Hospitality | 2011 |
| NH Holding AS | | 2021 |
| Nicole Torgersen Rådgivning AS | Professional & scientific | 2024 |
| NKS Holding AS | Financial services | 2012 |
| Nktr Holding AS | Professional & scientific | 2019 |
| Norcan Holding AS | Construction | 2023 |
| Nordbohus Modum AS | Construction | 2006 |
| Nordic Insulation Technology AS | Wholesale & retail | 2017 |
| Nordli Entreprenør AS | Construction | 2024 |
| Nordrin AS | Professional & scientific | 2026 |
| Norheims Eiendom AS | Real estate | 2022 |
| Norheims Holding AS | Construction | 2021 |
| Norheims Hus AS | Construction | 2021 |
| Norsk Bildelimport Limited Nuf | Wholesale & retail | 2008 |
| Norsk Maskinutvikling AS | Wholesale & retail | 2012 |
| Norsk Rørkompetanse AS | Construction | 2024 |
| North Import AS | Wholesale & retail | 2025 |
| Nye Stallen Matbar AS | Hospitality | 2022 |
| Oiv Holding AS | Real estate | 2020 |
| Okei Handel AS | Wholesale & retail | 2023 |
| Olafsbye Holding AS | | 2023 |
| Olsberg Solution AS | Transport & logistics | 2025 |
| Ompa Holding AS | | 2020 |
| Optiker Trond Weggersen AS | Wholesale & retail | 1988 |
| Pardon Norway AS | Wholesale & retail | 2012 |
| Park World Tour Travel AS | Administrative & support | 2001 |
| Paulsen Håndverk AS | Construction | 2025 |
| Per Kaald AS | Health & social care | 1996 |
| Pilterud Gård AS | Health & social care | 2023 |
| Pilterud Panorama AS | Construction | 2017 |
| Pojd Holding AS | Construction | 2021 |
| Prometheus Technologies AS | Professional & scientific | 2026 |
| PS Helse AS | | 2023 |
| Psykolog Bjørnar Bråthen AS | Health & social care | 2007 |
| Pukkproduksjon AS | Mining & quarrying | 1990 |
| Punjab Indisk Restaurant Og Bar AS | Hospitality | 2023 |
| PWK Holding AS | Professional & scientific | 2020 |
| På Hjørnet Cafe Og Catering AS | Hospitality | 2026 |
| Radonsikring AS | Professional & scientific | 2012 |
| Redstone Holding AS | Real estate | 2007 |
| Rent Og Ryddig AS | Administrative & support | 2013 |
| Rental Group Mobility AS | Administrative & support | 2007 |
| Rental Group Norway AS | Administrative & support | 1983 |
| Rental Group Trading AS | Wholesale & retail | 2020 |
| Resolv AS | Information & communication | 2021 |
| Restaurantdrift Fjordbyen AS | Hospitality | 2023 |
| Rogaland Marathon Tour AS | Administrative & support | 2000 |
| Runar Lien AS | Agriculture & fishing | 2020 |
| Ruud Handel Agentur AS | Wholesale & retail | 2019 |
| Rød Eik AS | Construction | 2015 |
| Røstvang SA | Arts & recreation | 1909 |
| Røyken Energiverk AS | Energy | 1994 |
| S&P Invest AS | Hospitality | 2023 |
| Saastad Holding AS | | 2019 |
| Sagatun Holding AS | Financial services | 2005 |
| Sagtomta Utbygging AS | Real estate | 2016 |
| Samviker AS | Health & social care | 2026 |
| Sand Båthavn SA | Real estate | 1937 |
| Sand Vannverk | Water & waste | 1947 |
| Sandum Eiendom AS | Real estate | 2013 |
| Sandum Holding AS | Real estate | 2005 |
| Sandum Invest AS | Real estate | 2010 |
| Scheen Eiendom 977 AS | Real estate | 2022 |
| Selcamo AS | Real estate | 1992 |
| Selcamo Eiendom AS | Real estate | 2019 |
| Senas AS | Other services | 2023 |
| Senas Rental AS | Real estate | 2023 |
| Sentrumsgården Vikersund AS | Real estate | 2000 |
| Servi-Pack AS | Manufacturing | 2024 |
| Servi-Pack Eiendom AS | Real estate | 2024 |
| Servi-Pack Holding AS | Manufacturing | 2024 |
| Sibiir SA | Arts & recreation | 2016 |
| Simensrud AS | Real estate | 2021 |