| Coragruppen AS | Real estate | 2021 |
| Cosmia AS | | 2024 |
| D&D Bildeler AS | Wholesale & retail | 2024 |
| Dalveien Invest AS | Professional & scientific | 2005 |
| Data Shop'En Da | Other services | 2005 |
| Datalink AS | Information & communication | 1993 |
| David Blids Gate 21 Mysen AS | Real estate | 2019 |
| David Blids Gate 23 AS | Real estate | 2025 |
| Davids Blidsgate 3 AS | Real estate | 2016 |
| DBG 21 AS | Real estate | 2018 |
| DC Eiendom AS | | 2026 |
| Deres Tannklinikk AS | Health & social care | 2015 |
| Design Partner I Norge AS | Professional & scientific | 2005 |
| Din Fothelse AS | Health & social care | 2024 |
| Diner 22 AS | Hospitality | 2022 |
| Dinmat Ans | Wholesale & retail | 2007 |
| Doctor Glass Avd Mysen AS | Other services | 2021 |
| Dramstad Mustorp Holding AS | Real estate | 2023 |
| E T Eiendom AS | | 2002 |
| E. Grimelid AS | Real estate | 2020 |
| E.N Auto Salg AS | Wholesale & retail | 2018 |
| E.T. Sprengningsservice AS | Construction | 2018 |
| Ebl Systems AB | Manufacturing | 2004 |
| Eggen Gartneri AS | Agriculture & fishing | 2019 |
| Eidsberg Entreprenør AS | Construction | 2012 |
| Eidsberg Herreds Regnskapslag SA | Professional & scientific | 1953 |
| Eidsberg IT Senter Ans | Information & communication | 2000 |
| Eks Utleie AS | Real estate | 2007 |
| El- Og IT Installasjoner AS | Professional & scientific | 2024 |
| Elnet AS | Information & communication | 2022 |
| Energigården Eiendom AS | Wholesale & retail | 2001 |
| Energigården Holding AS | Wholesale & retail | 2005 |
| Engen Industrier AS | Manufacturing | 1995 |
| Enger Logistics AS | Transport & logistics | 2016 |
| Ent Møbeldesign AS | Manufacturing | 2019 |
| Entertainment Club Ans | | 1991 |
| Equilibria Services Ltd | Professional & scientific | 2008 |
| Esbank Eiendom AS | Real estate | 1998 |
| Esl Norge AS | Administrative & support | 2010 |
| Eurotrade AS | Real estate | 2008 |
| Event Partner Norge AS | Hospitality | 2024 |
| Eventrix Production AS | Arts & recreation | 2018 |
| Exsalus AS | Education | 2024 |
| Fagmøbler Mysen AS | Wholesale & retail | 2011 |
| Fagmøbler Strengen AS | Real estate | 2000 |
| Fait Holdings AS | Real estate | 2013 |
| Fanlife AS | Education | 2014 |
| Fauna Invest AS | Wholesale & retail | 2023 |
| Favn Eiendom AS | Real estate | 2025 |
| Ferda Caravan Service Mysen AS | Other services | 2025 |
| Fha AS | Information & communication | 2025 |
| Fjella AS | Administrative & support | 2021 |
| Flex Utvikling AS | Wholesale & retail | 2018 |
| Floradekor AS | Wholesale & retail | 1999 |
| Fossens Eftf AS | Mining & quarrying | 1979 |
| Fotograf Grinna AS | Professional & scientific | 2005 |
| Fram Investment AS | Professional & scientific | 2012 |
| Fresh Deli AS | Wholesale & retail | 2017 |
| Frisørhjørnet Abc AS | Other services | 1999 |
| Frjomy Holding AS | | 2020 |
| Frode Pettersen AS | Wholesale & retail | 1993 |
| Frode Pettersen Drift AS | Wholesale & retail | 2017 |
| Frøken Fysen AS | Hospitality | 2026 |
| G Fosser Holding AS | Arts & recreation | 2021 |
| G-U Holding AS | | 2019 |
| Galleri Skrivergaarden AS | Wholesale & retail | 2013 |
| Galleri Tonne AS | Arts & recreation | 1986 |
| Gandhi Transport AS | Transport & logistics | 2025 |
| Garmann AS | Real estate | 2018 |
| Geotech AS | Wholesale & retail | 2024 |
| Geris AS | Construction | 2022 |
| Germania Performance AS | Other services | 2021 |
| Getresults Holding AS | | 2026 |
| Ghklipp AS | Other services | 2025 |
| Gjerstad Tekniske Rørlegger Og Vedlikehold AS | Construction | 2022 |
| GMM Invest AS | | 2025 |
| Gobiten Mysen AS | Hospitality | 2004 |
| Golemiec Invest AS | | 2025 |
| Graarud Invest AS | | 2025 |
| Grane II AS | Real estate | 2006 |
| Granerød Invest AS | Professional & scientific | 2005 |
| Gravfirma Jan Lundblad AB | Construction | 2002 |
| Grinna Gården AS | Real estate | 2005 |
| Grønheim Handel AS | Wholesale & retail | 2021 |
| Grøntvedt Film AS | Information & communication | 2018 |
| Gullgruva AS | Wholesale & retail | 2020 |
| Gullsmed Anton Huseby AS | Wholesale & retail | 1989 |
| Gundersen K AS | | 2023 |
| Gunnar Johnsrud AS | Manufacturing | 2021 |
| H.J Mauritzen & Sønn Lastebilutleie AS | Transport & logistics | 2012 |
| H.K. Holding AS | | 2022 |
| Haga Cementstøperi AS | Real estate | 2019 |
| Hakr Eiendom AS | Real estate | 2022 |
| Handelshuset Mysen AS | Real estate | 2015 |
| Hansen Holdings AS | Manufacturing | 1994 |
| Harald F AS | | 2021 |
| Hardwood Holding AS | Real estate | 2023 |
| Hasko Bidco 17 AS | | 2025 |
| Haugerud & Vikeby Holding AS | Real estate | 1996 |
| Havrefjell Hyttegrend AS | Real estate | 2002 |