| 1859 Holding AS | Real estate | 2020 |
| 3DMOD AS | Professional & scientific | 2024 |
| Anita Iren Heer Holding AS | | 2024 |
| Anleggsgartnermester Arild Garseg AS | Construction | 2009 |
| Birch Eiendom AS | Real estate | 1999 |
| Birkeland Gård Ans | Agriculture & fishing | 2020 |
| Bjørkvika Sporthorses Da | Agriculture & fishing | 2023 |
| Bjørn Solberg Graving Og Transport AS | Construction | 2016 |
| Bjørnerudhaugen Holding AS | | 2020 |
| Bobak AS | Real estate | 2014 |
| Broland Eiendom AS | Real estate | 1978 |
| Corebase Infrastructure AS | Information & communication | 2026 |
| Degnes Holding AS | Agriculture & fishing | 2005 |
| Eidsberg Bil Og Karroseri AS | Wholesale & retail | 1974 |
| Eidsberg Eiendom AS | Real estate | 2006 |
| Ema Solberg AS | Construction | 2015 |
| Emil Bygg AS | Construction | 2022 |
| Evjnor Holding AS | Real estate | 2025 |
| Finnestad Planteskole AS | Agriculture & fishing | 2021 |
| Finnestad Utvikling AS | Agriculture & fishing | 2010 |
| Flateby Og Skaarer AS | Real estate | 2019 |
| Funderud Antirust AS | Other services | 2015 |
| Funkner Maler Service AS | Construction | 2022 |
| G Drift AS | Administrative & support | 2013 |
| General Holding AS | | 2026 |
| Glade Jur AS | Manufacturing | 2023 |
| Granberg Holding AS | Real estate | 2012 |
| Gravor Maskin AS | | 2026 |
| Grønn Idé Holding AS | Agriculture & fishing | 2021 |
| Hans Kristian Skaarer AS | | 2018 |
| Heen Landbruksverksted AS | Wholesale & retail | 2013 |
| Heia Graveservice AS | Construction | 2019 |
| Hundens Verden AS | Wholesale & retail | 2020 |
| Høiefjerdingen Vannforsyningsanlegg SA | Water & waste | 1967 |
| Indre Østfold Eiendomsutvikling AS | Agriculture & fishing | 1997 |
| Jan-Tore Løkke AS | Construction | 2021 |
| Jarle Bjørnstad AS | Agriculture & fishing | 2020 |
| Julie Enger AS | Arts & recreation | 2023 |
| Kings Broiler AS | Agriculture & fishing | 1976 |
| Klinikk for Fotterapi AS | Health & social care | 2021 |
| Klokkergården Media AS | Information & communication | 2009 |
| Kriber Eiendom AS | Real estate | 2008 |
| Kronajordet AS | Hospitality | 2011 |
| Langeland Degnes Samdrift Da | Agriculture & fishing | 2000 |
| Lillerud Gård AS | Health & social care | 2022 |
| Ludoform AS | Wholesale & retail | 2025 |
| Løe Transport AS | Construction | 2012 |
| Malerfirma Martin Lunde AS | Construction | 2019 |
| Motorpower AS | Other services | 2025 |
| Navet Invest AS | Real estate | 2019 |
| Optimal Utvikling AS | Professional & scientific | 2023 |
| Pedersen Montering AS | Construction | 2024 |
| Per Søreng Og Ingebjørg Tønsberg Ans | Agriculture & fishing | 1981 |
| Risberg Forvaltning AS | Agriculture & fishing | 2020 |
| Riseberg Dykkertjeneste AS | Construction | 2023 |
| Rådhuset Cafe & Catering AS | Hospitality | 2025 |
| Rånås Lakk AS | Manufacturing | 2012 |
| Sjøsten AS | Manufacturing | 2022 |
| Skaarer Bil & Maskin Ans | Wholesale & retail | 2000 |
| Skogholt Utvikling AS | Real estate | 2022 |
| Smaalenene Beitelag SA | Agriculture & fishing | 2016 |
| Snekkern Dean Nuf | Construction | 2024 |
| Steinars Importservice AS | Manufacturing | 2022 |
| Strandveien AS | Real estate | 2020 |
| Susebakke Eiendom AS | Real estate | 2006 |
| Syversen Anlegg AS | Construction | 2021 |
| Torkelsrud Invest AS | Real estate | 2016 |
| Traagstad Sandblåsing Og Sprøytemaling AS | Construction | 2018 |
| Trømborg Sag Og Høvleri AS | Wholesale & retail | 1966 |
| Uvaag AS | Construction | 2015 |
| Vann Og Våtmark Konsult AS | Professional & scientific | 2023 |
| Verk Arkitektur AS | Professional & scientific | 2016 |
| Waternuts Invest AS | | 2023 |
| Winnem Transportservice AS | Transport & logistics | 2024 |
| Ørka Anlegg AS | Transport & logistics | 2026 |
| Ørka AS | Wholesale & retail | 2020 |
| Ørka Eiendom AS | Real estate | 2026 |
| Østfold Bygg Og Tømrertjenester AS | Real estate | 2000 |
| Østlandske Byggfornyelse AS | Professional & scientific | 2013 |