| Holmens Auto AS | Other services | 1991 |
| Holmens Lastebilutstyr AS | Wholesale & retail | 1976 |
| Holtskogen Nord AS | Real estate | 2022 |
| Horntvedt Rolf Og Kari Ans | Agriculture & fishing | 1988 |
| Huggenes Gård GB AS | Real estate | 1946 |
| Huggenes Østre AS | Real estate | 2007 |
| Huggenes Østre Drift AS | Agriculture & fishing | 2007 |
| Huseby Invest AS | | 2025 |
| Ilstad Montering AS | Construction | 2026 |
| Im Group AS | Other services | 2025 |
| Imex Auto AS | Other services | 2026 |
| Impreso Norge AS | Information & communication | 2017 |
| Industriveien 14 AS | Real estate | 2006 |
| Inspirida AS | Real estate | 2018 |
| Inspirida Consulting AS | Professional & scientific | 2019 |
| Ipoa AS | Manufacturing | 2011 |
| Ipoa Eiendom AS | Real estate | 2017 |
| Ipoa Group AS | Real estate | 2017 |
| Ipoa Næringseiendom AS | Real estate | 2018 |
| It-Store AS | Wholesale & retail | 2016 |
| Iteam Braathe AS | Information & communication | 2000 |
| Jan Grønberg Eftf. AS | Professional & scientific | 1987 |
| Jans Byggeservice & Sønn AS | Construction | 2014 |
| Jarema AS | Construction | 2016 |
| Jeju Holding AS | Wholesale & retail | 2024 |
| Jens Petter Otterstad AS | Agriculture & fishing | 2005 |
| Jenssen & Vaarum Holding AS | Construction | 2021 |
| Jenssen-System AS | Construction | 2021 |
| JJ Kompetansetjenester AS | Education | 2020 |
| JM Land AS | | 2024 |
| JMK Holding AS | | 2019 |
| Jobbidrett AS | Administrative & support | 2013 |
| Jobblink.Ai AS | Information & communication | 2024 |
| Kase Øko Da | Agriculture & fishing | 2020 |
| KFK Helse AS | Health & social care | 2018 |
| King Long Norge AS | Wholesale & retail | 2020 |
| Kipro AS | Information & communication | 2026 |
| Kirkebakken Vanningslag SA | Agriculture & fishing | 1977 |
| Kongens Brygge 2 AS | Real estate | 1993 |
| Konkord Film AS | Professional & scientific | 2026 |
| Kremo AS | Other services | 2000 |
| Kubberød AS | Health & social care | 2013 |
| Kure Gartneri AS | Agriculture & fishing | 2016 |
| Kureåa Vanningslag SA | Agriculture & fishing | 1981 |
| Kvaenveien 2 AS | Real estate | 2026 |
| Kvaenveien 5 AS | Real estate | 2026 |
| Lageret Pub AS | Hospitality | 2019 |
| Lasses Bilforretning AS | Wholesale & retail | 2021 |
| Lett Lader AS | Wholesale & retail | 2016 |
| Lille Rygge Næringspark AS | Real estate | 2006 |
| Linktour Norge AS | Wholesale & retail | 2026 |
| LML Invest AS | | 2022 |
| Luft & Fasade AS | Construction | 2025 |
| Lycon AS | Professional & scientific | 2001 |
| Mac Entreprenør AS | Construction | 2020 |
| Magnem Holding AS | | 2022 |
| Malerkameratene H. AS | Construction | 2023 |
| Mamcel AS | Professional & scientific | 2018 |
| Marine Environment AS | Professional & scientific | 2023 |
| MARINESERVICE1 AS | Manufacturing | 2012 |
| Marnor Invest AS | Professional & scientific | 2018 |
| Max Health AS | Manufacturing | 2019 |
| Mellom Kure Da | Agriculture & fishing | 2009 |
| Memoaccounting AS | Professional & scientific | 2008 |
| Milano Pizza Og Kebab Rygge AS | Hospitality | 2022 |
| Morlie Holding AS | Transport & logistics | 2017 |
| Moss Betong & Stål AS | Construction | 2026 |
| Moss Boligservice AS | Construction | 2021 |
| Moss Båt Og Motor AS | Wholesale & retail | 2025 |
| Moss Flis & Betong AS | Construction | 2010 |
| Moss Husholdningsservice AS | Other services | 2012 |
| Moss Kulde & Varmeteknikk AS | Construction | 2007 |
| Moss Næringspark AS | Real estate | 2008 |
| Moss Power Electronics AS | Energy | 1997 |
| Moss To-Takt Skadesenter AS | Other services | 2024 |
| Moss Turbusser AS | Transport & logistics | 2018 |
| Mpe Cathodic AS | Professional & scientific | 2007 |
| Mpec Eiendom AS | Real estate | 2008 |
| MR Steakhouse AS | Hospitality | 2023 |
| Msy Holding AS | Real estate | 2021 |
| Nathan Holding AS | Education | 2016 |
| Nesheim Buss AS | Wholesale & retail | 2021 |
| Nesheim Eksport AS | Wholesale & retail | 2026 |
| Nevo AS | Water & waste | 2019 |
| Nordic Byggpartner AS | Construction | 2020 |
| Nordic Food Drift AS | Hospitality | 2026 |
| Nordre Bjølsund Holding AS | Health & social care | 2018 |
| Nordre Kure Da | Agriculture & fishing | 2008 |
| Nærum AS | Agriculture & fishing | 1998 |
| Odd Kvisler AS | Arts & recreation | 2013 |
| Omega Industrier AS | Manufacturing | 2009 |
| Ordfører Utnes Vei 14 AS | Real estate | 2024 |
| Osloveien AS | Real estate | 2020 |
| Osterhausgaten Dører & Vinduer AS | Wholesale & retail | 1993 |
| Oven Eiendom AS | Real estate | 2003 |
| Oven Handel AS | Wholesale & retail | 2014 |
| Oven Invest AS | Real estate | 2005 |
| Oven Næringseiendom AS | Real estate | 2007 |
| Oven Va. SA | Water & waste | 2019 |
| Pace Pilot AS | Education | 2024 |