| Figen Invest AS | | 2026 |
| Figglo AS | Information & communication | 2025 |
| Figusta AS | | 2024 |
| Fiizk Aquaculture Systems AS | Agriculture & fishing | 2022 |
| Fiizk AS | Professional & scientific | 2022 |
| Fiizk Industries AS | Manufacturing | 2024 |
| Fiks Tjenester AS | Health & social care | 2024 |
| Filiis AS | | 2023 |
| Filip Aune AS | Transport & logistics | 2022 |
| Filmfest Trondheim AS | Information & communication | 2002 |
| Fin Bolig AS | Real estate | 2019 |
| Fin Bolig Drift AS | Real estate | 2019 |
| Fin Farge AS | Construction | 2024 |
| Finaka AS | | 2021 |
| Finans Partner AS | | 2005 |
| Finans Partner Rådgivning AS | | 2013 |
| Finansiell Helse AS | Professional & scientific | 2020 |
| Finanspartner Da | | 1996 |
| FINCK1 Holding AS | | 2020 |
| Fincon AS | Real estate | 1981 |
| Finesto AS | Hospitality | 2016 |
| Fink Trondheim AS | Information & communication | 2017 |
| Finn T. Johnsen Holding AS | | 2021 |
| Finnbuan AS | Construction | 2020 |
| Finnbuan Eiendom AS | Real estate | 2022 |
| Finnes Villa AS | Real estate | 2017 |
| Finno AS | Real estate | 2005 |
| Finnprosjekt AS | Professional & scientific | 2015 |
| Finsrud Invest AS | | 2024 |
| Fiolinmakern AS | Wholesale & retail | 2003 |
| Fipling Holding AS | | 2019 |
| Fire-K Invest AS | Financial services | 2005 |
| Firelink Systems Da | Wholesale & retail | 2009 |
| Firkløverakademiet AS | Education | 2024 |
| Firmagodt AS | Wholesale & retail | 2021 |
| Fisk Og Video AS | Financial services | 2007 |
| Fiskarlagets Servicekontor AS | Other services | 2002 |
| Fiskerinæringens Innkjøpsselskap AS | Administrative & support | 1994 |
| Fiskum Sunde AS | Professional & scientific | 2023 |
| Fitdora AS | Wholesale & retail | 2017 |
| Fitness Gear AS | Wholesale & retail | 2026 |
| Fitness Rent AS | Administrative & support | 2023 |
| Fitness Service AS | Wholesale & retail | 2014 |
| Fitnesspoint Drift AS | Arts & recreation | 2013 |
| Fitnesspoint Group AS | Arts & recreation | 2013 |
| Fiva Holding AS | Financial services | 2017 |
| Five Invest&Consulting AS | Professional & scientific | 2006 |
| Fiwi Holding AS | | 2021 |
| Fix Helse AS | Health & social care | 2019 |
| Fixit Multiservice AS | Administrative & support | 2019 |
| Fjaex Holding AS | Other services | 2021 |
| Fjeldseth AS | Construction | 1986 |
| Fjeldstad Olsen Invest AS | Real estate | 2019 |
| Fjell & Fjord AS | Real estate | 2007 |
| Fjellberg Foto AS | Other services | 2014 |
| Fjelldal Consulting & Engineering AS | Professional & scientific | 2015 |
| Fjellmark AS | Administrative & support | 2011 |
| Fjellmums AS | Administrative & support | 2025 |
| Fjellnatur AS | Real estate | 2021 |
| Fjellroen Naturguiding Da | Administrative & support | 2021 |
| Fjellseterveien 12-14 AS | Households | 1954 |
| Fjellseterveien 40 AS | Households | 1956 |
| Fjellull AS | Wholesale & retail | 2024 |
| Fjellvasslia AS | Information & communication | 2009 |
| Fjellvasslia Eiendom AS | Real estate | 2021 |
| Fjord Invest Sørvest AS | Financial services | 2006 |
| Fjord Models AS | Other services | 2024 |
| Fjorden Eiendom AS | Construction | 2010 |
| Fjordgata 1 Invest AS | Real estate | 2005 |
| Fjordgata 10 AS | Real estate | 2014 |
| Fjordgata 10 Porsgrunn AS | Real estate | 2012 |
| Fjordgata 12 AS | Real estate | 1993 |
| Fjordgata 15 AS | Real estate | 2020 |
| Fjordgata 24 Holding AS | | 2015 |
| Fjordgata 31 AS | Real estate | 2016 |
| Fjordgata 34 AS | Real estate | 2014 |
| Fjordgata 37 AS | Real estate | 2011 |
| Fjordgata 50 AS | Real estate | 2007 |
| Fjordgata 54 AS | Wholesale & retail | 1976 |
| Fjordgata 56-58 AS | Real estate | 1996 |
| Fjordgata 68 AS | Real estate | 2020 |
| Fjordgata 7 Trondheim AS | Real estate | 2015 |
| Fjordgata Dagligvare AS | Wholesale & retail | 2025 |
| Fjordgata Fysioterapi Og Osteopati AS | Health & social care | 2001 |
| Fjordgata Records AS | Information & communication | 2022 |
| Fjordgt 33 AS | Real estate | 2014 |
| Fjordgt 43 AS | Real estate | 1982 |
| Fjordgt 82 AS | Real estate | 2003 |
| Fjordgt. 21 AS | Construction | 2014 |
| Fjordgt. 78 AS | Real estate | 2006 |
| Fjærgata Taxi AS | Administrative & support | 2025 |
| Fjørtoft AS | Professional & scientific | 2019 |
| FK Electronics AS | Manufacturing | 2014 |
| Fl-Takst AS | Real estate | 2026 |
| Flaaten AS | Professional & scientific | 2022 |
| Flack Bergby AS | Health & social care | 2023 |
| Flack Bergby Holding AS | Health & social care | 2013 |
| Flaggskipet AS | Wholesale & retail | 2022 |
| Flamme Aerospace AS | Professional & scientific | 2025 |
| Flammekaster Trondheim AS | Information & communication | 2025 |