| Elite Padel AS | Arts & recreation | 2019 |
| Elitevekst AS | | 2025 |
| Elta-Con Holding AS | | 2018 |
| Elvemo Longform Media AS | Arts & recreation | 2025 |
| Elwa Holding AS | Real estate | 2016 |
| Eme Holding AS | Real estate | 2018 |
| Emgods Bolig AS | Real estate | 2017 |
| Emh AS | Real estate | 2017 |
| Emorphia Sarpsborg AS | Other services | 2023 |
| Empet Østfold AS | Professional & scientific | 2018 |
| En Holding AS | Real estate | 2005 |
| Enenda Eiendom AS | Real estate | 2022 |
| ENERGI1 AS | Construction | 2017 |
| Enertoppen Holding AS | Financial services | 2005 |
| Enger Eiendom AS | | 2025 |
| Enger Investment Group AS | Information & communication | 2019 |
| Enger Selskapsforvaltning AS | Information & communication | 2025 |
| Engløkken AS | Professional & scientific | 2012 |
| Engløkken Invest AS | Financial services | 2014 |
| Enjoy Food AS | Manufacturing | 2012 |
| Entertainment Padel Group AS | Arts & recreation | 2021 |
| Envirotech Ans | Wholesale & retail | 2007 |
| Ep-Teq AS | Wholesale & retail | 2025 |
| Erik & Morten Bygg Da | Construction | 2000 |
| Erik Johansson AS | Construction | 2009 |
| Eriksen & Larsen AS | Construction | 2017 |
| Eriksen Eiendom AS | Real estate | 1999 |
| Eriksen Eiendom Øst AS | Real estate | 2015 |
| Ermida AS | Information & communication | 2016 |
| Escape History AS | Professional & scientific | 2017 |
| Et Cafe Da | Hospitality | 2000 |
| Eudaimonia AS | Information & communication | 2007 |
| Evjo Invest AS | | 2012 |
| Exeo Flowparks AS | Wholesale & retail | 2021 |
| Express Reiser AS | Transport & logistics | 2015 |
| Exs Nordic Nuf | Wholesale & retail | 2025 |
| F1-INVEST AS | Real estate | 2009 |
| Fact Eiendom AS | Real estate | 2007 |
| Fagtrapp Østfold AS | Construction | 2022 |
| Fair Clothing AS | Wholesale & retail | 2012 |
| Falcon Transport AS | Transport & logistics | 2025 |
| Fares Auto AS | Wholesale & retail | 2024 |
| Farmers Golf AS | Arts & recreation | 2020 |
| Fbo System Solutions AS | Information & communication | 2024 |
| Felt Bygg AS | Real estate | 2000 |
| Fem B Eiendom AS | Real estate | 2020 |
| Fem B Holding AS | Real estate | 2020 |
| Fem Små Stuer Ans | Other services | 1987 |
| Fem Små Stuer AS | Other services | 2012 |
| Fenti AS | | 2023 |
| Ferrospes AS | Administrative & support | 1998 |
| Fingerspitz Norge AS | Arts & recreation | 2025 |
| Finkirken Holding AS | | 2008 |
| Finstad Bygg AS | Construction | 2021 |
| Fitness Clothing AS | Wholesale & retail | 2022 |
| Fivas A/S | Professional & scientific | 1988 |
| Fjellhøyveien 1 Butikkeiendom AS | Real estate | 2018 |
| Fjøset, Spill & Spiseri Da | Wholesale & retail | 2009 |
| Flexi AS | Professional & scientific | 1986 |
| Flinth AS | Professional & scientific | 2024 |
| Flis Og VVS Senteret AS | Wholesale & retail | 2020 |
| Florett Holding AS | Professional & scientific | 2004 |
| Flow Tannhelse AS | Health & social care | 2020 |
| Flowlyx AS | Information & communication | 2025 |
| Flowstate Solutions AS | Wholesale & retail | 2025 |
| Flux Eiendom AS | Real estate | 2022 |
| FM Music AS | Arts & recreation | 2023 |
| FMW Holding AS | | 2026 |
| Formed AS | Professional & scientific | 2008 |
| Forsbacka Invest AS | Real estate | 2006 |
| Fosby Anlegg AS | Construction | 2012 |
| Fosby AS | Construction | 1978 |
| Fosby Drift AS | Construction | 1990 |
| Fosby Kran AS | Construction | 2012 |
| Fosby Petico Eiendom AS | Real estate | 2011 |
| Fosby Stillas AS | Construction | 2012 |
| Fossen & Krydderhylla Møbel Og Interiørverksted Da | Manufacturing | 2001 |
| Fotoetcetera AS | Professional & scientific | 2018 |
| Foyns Holding AS | | 2025 |
| Foyns Spiseria AS | Hospitality | 2024 |
| FPG Invest AS | Construction | 2016 |
| Frankering & Kopiservice AS | Wholesale & retail | 1986 |
| Fratellis AS | Hospitality | 2019 |
| Fredriko AS | | 2005 |
| Fredrikstad Skiltindustri AS | Professional & scientific | 1997 |
| Fremmkom AS | Education | 2019 |
| Fresh Mood AS | Hospitality | 2025 |
| Frigaard AS | Construction | 2014 |
| Frigaard Eiendom AS | Real estate | 2009 |
| Frigaard Eiendom Storstua AS | Real estate | 2009 |
| Frigaard Entreprenør AS | Construction | 2022 |
| Frigaard Industries AS | Real estate | 2012 |
| Frigaard Property Group AS | Construction | 2010 |
| Frisør 1 Sarpsborg AS | Other services | 2007 |
| Frisør Hege Johansen AS | Other services | 2018 |
| Frisør NO3 AS | Other services | 2022 |
| Fritid Invest AS | Real estate | 2012 |
| Fritznerbakken Garasjelag SA | Transport & logistics | 1979 |
| Frode Reiersen AS | Financial services | 2015 |
| Frontline Drift AS | Real estate | 1994 |