| Gråtass Barnehage Veelstoppen AS | Education | 2023 |
| Grønt Kretsløp AS | Agriculture & fishing | 2010 |
| GTL Management AS | Professional & scientific | 2008 |
| Gudesen Eiendom AS | Real estate | 1993 |
| H. M. Tegneby AS | Financial services | 2005 |
| H.L Bygg & Design AS | Construction | 2024 |
| Hansen & Hystad AS | Real estate | 2022 |
| Hart Rom AS | Hospitality | 2025 |
| Hauge Sveis Og Torp Invest AS | Real estate | 1999 |
| Haugsten Eiendom AS | Real estate | 2000 |
| Haugsten Invest AS | Wholesale & retail | 2019 |
| Heieren Holding AS | Financial services | 2013 |
| Heimo Holding AS | | 2025 |
| Heimo Invest AS | | 2024 |
| Helilab AS | Information & communication | 2001 |
| Helmaks Holding AS | Financial services | 2016 |
| Historisk Tegl AS | Wholesale & retail | 2017 |
| Hjem AS | Wholesale & retail | 1991 |
| HJN Holding AS | | 2025 |
| Holth Bygg & Anlegg AS | Construction | 2018 |
| HPG Eiendom AS | Real estate | 2004 |
| Humlekjær Og Ødegaard AS | Water & waste | 1987 |
| Hund På Jobb AS | Other services | 2016 |
| Hvaler Marina AS | Real estate | 1983 |
| Hverdagsvenner AS | Other services | 2026 |
| Håndverkssenter AS | Real estate | 2006 |
| Håndverksutdanning AS | Education | 2017 |
| Indian Adventures AS | Administrative & support | 2013 |
| Ingolf Jarmann Og Sønner AS | Manufacturing | 2021 |
| J Lande Holding AS | | 2020 |
| JBH Holding AS | | 2025 |
| Jemas Eiendom AS | Real estate | 1995 |
| Jensen Montering Og Vedlikehold AS | Administrative & support | 2020 |
| Jo Holding AS | Construction | 2023 |
| JP Holding AS | Real estate | 2012 |
| Jørgensen Og Jørgensen AS | Construction | 2023 |
| Jørgensen Og Jørgensen Eiendom AS | Real estate | 2023 |
| Jørgensen Og Jørgensen Holding AS | Construction | 2023 |
| Karl Egil Klevstadlien Offshore AS | Mining & quarrying | 2017 |
| Karstensen Og Sønner AS | | 2025 |
| Katrineborg Eiendom AS | Real estate | 2007 |
| Ken Invest AS | Real estate | 2024 |
| Kicker Invest AS | Real estate | 2019 |
| Kittilsen Dagligvare AS | Wholesale & retail | 2024 |
| Klar Ferdig Bygg AS | Construction | 2020 |
| Konsulentfirmaet Tel-It AS | Information & communication | 1999 |
| Kontor Konsult AS | Wholesale & retail | 1989 |
| Laboratoriet AS | Arts & recreation | 2022 |
| Lassens Hverdagshjelp AS | Health & social care | 2015 |
| Lastebilens Bruktmarked Ans | Professional & scientific | 1988 |
| Latex Planet Da | Wholesale & retail | 2000 |
| LCT Holding AS | | 2021 |
| Lev Holding AS | | 2026 |
| Lev Pluss AS | Information & communication | 2026 |
| Lindstad Lucrum AS | | 2026 |
| Lineo AS | Information & communication | 2013 |
| Linova Bygg Service AS | Construction | 2021 |
| Loxeo AS | Manufacturing | 2023 |
| Lundquist Forlag AS | Information & communication | 2017 |
| Lushline Beauty Lounge AS | Other services | 2026 |
| Løken Media AS | Information & communication | 2020 |
| Løkkeberg Prosjekt AS | Professional & scientific | 2026 |
| Magnus Motor AS | Other services | 1999 |
| Malerservice Fredrikstad AS | Construction | 2025 |
| Mamano AS | Wholesale & retail | 2024 |
| Markedsførerne Da | Professional & scientific | 2023 |
| Medical Beauty AS | Other services | 2026 |
| Mediyoga Studio Da | Education | 2024 |
| Meyer Holding AS | Real estate | 1992 |
| MG Pro AS | Construction | 2026 |
| Mhansen Invest AS | | 2025 |
| Mins Holding AS | Financial services | 2016 |
| Mitcha AS | Professional & scientific | 2016 |
| Moa Fabrikker AS | Manufacturing | 2024 |
| Moby Entreprenør AS | Construction | 2007 |
| Moby Properties AS | Real estate | 2024 |
| Moby Saneringsservice AS | Construction | 2020 |
| MODUM-STIGEN FREDRIKSTAD ANS Johannessen og Brynildsen | Wholesale & retail | 1990 |
| Mogan Eiendom AS | Real estate | 2013 |
| Mogan Holding AS | Real estate | 2007 |
| Molteberg AS | Real estate | 2019 |
| Molteberg Eiendom AS | Real estate | 2019 |
| Molteberg Holding AS | Real estate | 2022 |
| MSL AS | Information & communication | 2007 |
| Naga D. AS | | 2024 |
| Nett-Tjenester AS | Construction | 2010 |
| No Monte AS | | 2024 |
| Nonlin AS | Wholesale & retail | 1994 |
| Norconsult Boreteknikk AS | Professional & scientific | 2020 |
| Nordic Rørservice AS | Construction | 2025 |
| Noren Maler Og Byggtapetserforretning AS | Construction | 1991 |
| Norsk Campingutvikling AS | Hospitality | 2021 |
| Norsk Zinkvalseverk AS | Real estate | 2013 |
| Oha-Holding AS | Financial services | 2018 |
| Onlywater Da | Wholesale & retail | 2007 |
| Optimal Entreprenør AS | Construction | 2012 |
| Oremoveien Va SA | Real estate | 2011 |
| Ov Handel AS | Wholesale & retail | 2025 |
| P-H Holding AS | Construction | 2018 |
| Parketteksperten AS | Wholesale & retail | 2016 |