| Edits Studio AS | Professional & scientific | 2026 |
| Eggen Press AS | Professional & scientific | 1984 |
| Eggen Pro AS | Professional & scientific | 2021 |
| Egisol AS | Financial services | 2006 |
| Egy Eiendom AS | Real estate | 2021 |
| Eiendomsforum Forvaltning AS | Real estate | 2005 |
| Eiendomsselskapet Planke AS | Real estate | 2014 |
| Eileen Invest AS | Professional & scientific | 2012 |
| Eily AS | Real estate | 2013 |
| Eimak Holding AS | | 2026 |
| Einar Hellstrøm AS | Professional & scientific | 1996 |
| Eir Trening AS | Arts & recreation | 2020 |
| Eirins Hud Og Fotpleie AS | Other services | 2019 |
| Eiti AS | Real estate | 2016 |
| Ej Eiendom Fredrikstad AS | Real estate | 2010 |
| Ekeberg Drenering AS | Construction | 2019 |
| Eketoppen 7 Holding AS | | 2025 |
| Eketoppen Holding AS | Real estate | 2015 |
| Ekheim Invest AS | Real estate | 2005 |
| Ekheimtunet AS | Real estate | 2017 |
| Eksfire AS | Manufacturing | 1993 |
| Eksport AS | Wholesale & retail | 2017 |
| El-Geniet Ytre Østfold AS | Construction | 2023 |
| Elektra Norge AS | Wholesale & retail | 2009 |
| Elektrikertjenesten Sarpsborg-Fredrikstad AS | Construction | 2006 |
| Elektro Kompass AS | Professional & scientific | 2026 |
| Elektrosmia Installasjon AS | Construction | 2006 |
| Elementfasade AS | Construction | 2021 |
| Elentha AS | Information & communication | 2024 |
| Eliassens Eiendom AS | Real estate | 2017 |
| Elina House AS | Hospitality | 2024 |
| Elins Kantine AS | Hospitality | 2009 |
| Ella W AS | Professional & scientific | 2026 |
| Ellie Holding AS | Information & communication | 2016 |
| Elmobile AS | Wholesale & retail | 2021 |
| Elv Og Hav Management AS | Professional & scientific | 2018 |
| Elvebredden Fredrikstad AS | Hospitality | 2014 |
| Em Engineering Ans | Real estate | 2003 |
| Emø Eiendom AS | Real estate | 2014 |
| En Lille AS | Financial services | 2005 |
| Enabler AS | Information & communication | 2021 |
| Endre Solvi AS | Health & social care | 2005 |
| Energie AS | | 2020 |
| Energy Solution Holding AS | Wholesale & retail | 2023 |
| Enets AS | Real estate | 2016 |
| Engh Eiendom AS | Real estate | 1999 |
| Engø-Monsen Consulting AS | Information & communication | 2025 |
| Engø-Monsen Invest AS | | 2023 |
| Eo Property and Invest AS | Real estate | 2011 |
| Eob Holding AS | | 2022 |
| Eops AS | Real estate | 2021 |
| Epinor AS | Wholesale & retail | 1985 |
| Equilibria Holding Company AS | Agriculture & fishing | 2018 |
| Erik Fossum Holding AS | Wholesale & retail | 2005 |
| Erikstad Holding AS | | 2023 |
| Erling Manseterbak Holding AS | Real estate | 2009 |
| Erlingsen Invest AS | | 2025 |
| Eskil Holding AS | | 2021 |
| Et Eiendom Fredrikstad AS | Real estate | 2019 |
| Etera AS | Real estate | 2024 |
| Eterainvest AS | Real estate | 2025 |
| Ett Hakk Opp AS | Professional & scientific | 2022 |
| Etterforskergruppen AS | Administrative & support | 2025 |
| Evenitec AS | Information & communication | 2016 |
| Evenrød Invest AS | | 2025 |
| Eventwood AS | Information & communication | 2021 |
| Eventyrfjell AS | Wholesale & retail | 2026 |
| Evi Solutions AS | Manufacturing | 2021 |
| Evjekaia Torg AS | Real estate | 1994 |
| Ewa Gaik AS | Professional & scientific | 2024 |
| Exac AS | Professional & scientific | 2019 |
| Exit Disco Ans | Hospitality | 1989 |
| Exito Invest AS | Real estate | 2005 |
| Faale AS | Professional & scientific | 1999 |
| Faale Holding AS | | 2023 |
| Fabel Eiendomsutvikling Fredrikstad AS | Real estate | 2018 |
| Fabel Holding AS | Manufacturing | 2018 |
| Fable Labs AS | Information & communication | 2026 |
| Face AS | Professional & scientific | 2015 |
| Facit AS | Professional & scientific | 2005 |
| Fagertind AS | Professional & scientific | 2023 |
| Fagertind Prosjekt AS | Professional & scientific | 2023 |
| Family Trening Fredrikstad AS | Arts & recreation | 1996 |
| Fantasy Frisør AS | Other services | 2024 |
| Far East Restaurant AS | Hospitality | 2019 |
| Fargefilm AS | Information & communication | 2026 |
| Farhan Rafique AS | Health & social care | 2013 |
| Farmannsgate 1 AS | Real estate | 2011 |
| Farmannsgate 2 AS | Real estate | 2006 |
| Farmannsgate Tannlegesenter AS | Health & social care | 2015 |
| Farmors Catering Da | Hospitality | 2005 |
| Fast Trading AS | Wholesale & retail | 2018 |
| Fasteign AS | Real estate | 2021 |
| Faust Medisinske Senter AS | Health & social care | 2018 |
| Fbhd Drift AS | Education | 2013 |
| Febersyn AS | Arts & recreation | 2013 |
| Feelgood Fredrikstad AS | Arts & recreation | 2017 |
| Feholmen Invest AS | Financial services | 2005 |
| Fekermand Invest AS | Professional & scientific | 2026 |
| Feldt Hansen Invest AS | | 2023 |