| Elveparken Brygge AS | Real estate | 2019 |
| Emgust AS | Financial services | 2017 |
| Empet Halden Dyreklinikk AS | Professional & scientific | 2022 |
| Emra AS | Real estate | 2006 |
| Energy & Ict Invest AS | Information & communication | 2005 |
| Enoptim AS | Information & communication | 2017 |
| Enøk-Bygg Øst AS | Real estate | 2010 |
| Epakk AS | Transport & logistics | 2025 |
| Epicards AS | Wholesale & retail | 2023 |
| Epletræ AS | Real estate | 2011 |
| Ericsson Microwave Systems AB | Manufacturing | 1995 |
| Erik Hauge AS | Real estate | 2001 |
| Erik Hauge Holding AS | | 2025 |
| Erik Larm AS | Transport & logistics | 2018 |
| Erik Olsen Dagligvare AS | Wholesale & retail | 2017 |
| Erikh Holding AS | | 2020 |
| Ernstine AS | | 2025 |
| Eskeviken AS | Health & social care | 1998 |
| Eskilstuna Glas & Bygg AB | Construction | 2009 |
| Esmart Systems AS | Information & communication | 2012 |
| Esmart Systems International AS | Information & communication | 2020 |
| Essense AS | Wholesale & retail | 2024 |
| Euro Wave Energy AS | Energy | 1992 |
| Euroflytt AS | Transport & logistics | 2025 |
| Europa Rundt | Administrative & support | 2018 |
| Europea 12 Invest AS | Real estate | 2016 |
| Eurovent Norge AS | Wholesale & retail | 2013 |
| Evas Trading Eva Og Dagfinn Lundsrud Ans | Wholesale & retail | 1987 |
| Evensen Emballasje AS | Wholesale & retail | 2021 |
| Eventylon AS | Information & communication | 2016 |
| Evita Media AS | Information & communication | 2005 |
| Exenter AS | Real estate | 1999 |
| Extralageret 1 AS | Real estate | 2026 |
| Extralageret AS | Real estate | 2011 |
| Extralageret Invest AS | Real estate | 2019 |
| Extralageret Kambo Eiendom AS | Real estate | 2026 |
| Eyki Invest AS | Health & social care | 2024 |
| F Jørgensen AS | Construction | 1989 |
| F-Tech Holding AS | | 2019 |
| F. Jørgensen Invest AS | Construction | 2013 |
| F.V Norway AS | Wholesale & retail | 2024 |
| Fairpoint Outdoors Nuf | Wholesale & retail | 2005 |
| Faizi Eiendom AS | Real estate | 2023 |
| Faizi Medisinske AS | Health & social care | 2023 |
| Falch Investering AS | | 2026 |
| Falchen Invest AS | | 2026 |
| Falcons AS | Information & communication | 2019 |
| Falkenberg Bygg & Entreprenad AB | Professional & scientific | 2011 |
| Familiebaserte Tjenester Da | Health & social care | 2010 |
| Far-Ship AS | Financial services | 1993 |
| Farzan Eiendom AS | Real estate | 2019 |
| Fause Hovind Holding AS | | 2026 |
| Fbtb Samtalen AS | Health & social care | 2021 |
| Fellert Ecoustic System AB | Construction | 2005 |
| Feltmek AS | Manufacturing | 2026 |
| Feminett Halden AS | Wholesale & retail | 2004 |
| Festningsbutikken AS | Wholesale & retail | 2025 |
| Festningsgata 16 AS | Real estate | 2025 |
| FG. Holding AS | Wholesale & retail | 2020 |
| Fhi AS | Real estate | 2021 |
| Fibreworks AS | Information & communication | 2005 |
| Fibreworks Consulting AS | Information & communication | 2008 |
| Figenschau Invest AS | Financial services | 2008 |
| Fingerprint Retail AS | Construction | 2014 |
| Fisketorget 1 AS | Real estate | 1998 |
| Fisketorget 2 AS | Real estate | 2006 |
| Fisketorget 3 AS | Real estate | 2020 |
| FJ Norge AS | Other services | 2014 |
| Fjeld Aktiva AS | Construction | 2022 |
| Fjeld Eiendom Og Utvikling AS | Real estate | 2022 |
| Fjeld Mekaniske Ans | Manufacturing | 2001 |
| Fjeldhus Holding AS | | 2026 |
| Fjeldhøi Bygg AS | Construction | 2017 |
| Fjeldhøi Takst Og Eiendom AS | Professional & scientific | 2022 |
| Fjeldstuen Holding AS | Financial services | 2017 |
| Fjellhammeren AS | Real estate | 2005 |
| Fjellås Boliger AS | Real estate | 2019 |
| Fjordstien Forvaltning AS | Professional & scientific | 2004 |
| Fjøsgata AS | Real estate | 2013 |
| Fladstad Eiendom AS | Real estate | 2021 |
| Flamenco Halden Ristorante AS | Hospitality | 2015 |
| Flis Og Malerservice AS | Construction | 2010 |
| Flisdesign Halden AS | Wholesale & retail | 2024 |
| FLOTT FOR M Eliassen og Stefansson ANS | | 1988 |
| Flumag AS | Real estate | 2024 |
| Folk I Halden AS | Administrative & support | 2020 |
| Forever Holding AS | Other services | 2021 |
| Forksound AS | Financial services | 2013 |
| Fortress Fund 1 AS | Financial services | 2022 |
| Fortress Fund Management AS | Financial services | 2021 |
| Forza No AS | Information & communication | 2023 |
| Fosna AS | Construction | 2013 |
| Fossekallen Kontroll AS | Administrative & support | 2022 |
| Fotklinikken Halden AS | Health & social care | 2017 |
| Fotofonium AS | Professional & scientific | 2021 |
| Fotolounge AS | Professional & scientific | 2023 |
| Fredrik De Flon Holding AS | | 2023 |
| Fredrikshald Fysioterapi AS | Health & social care | 2013 |
| Fredrikshald Invest AS | Wholesale & retail | 2024 |
| Fredrikshald Vineri AS | Manufacturing | 2022 |