| Finder Holding AS | Information & communication | 2021 |
| Finder Store AS | Information & communication | 2022 |
| Finnjord Regnskap AS | Professional & scientific | 2016 |
| Finnsnes Utbygging AS | Real estate | 2020 |
| Fint Kafé & Bar | Hospitality | 2021 |
| Fir-Kløver AS | Transport & logistics | 2015 |
| Firbent Da | Wholesale & retail | 2004 |
| First Adventures AS | Arts & recreation | 2025 |
| First Hotels International AS | Administrative & support | 2014 |
| Fiseso Holding AS | Real estate | 2022 |
| Fishfluencers AS | Professional & scientific | 2021 |
| Fishing 4 Life AS | Arts & recreation | 2024 |
| Fiskekompaniet Tromsø AS | Hospitality | 2009 |
| Fiskeri- Og Havbruksnæringens Forskningsfinansiering AS | Public administration | 2018 |
| Fiskernes Agnforsyning SA | Wholesale & retail | 1941 |
| Fiskernes Hus AS | Real estate | 1996 |
| Fitness Nord AS | Wholesale & retail | 2020 |
| Fjehan AS | Real estate | 2017 |
| Fjellfrosk AS | Professional & scientific | 2011 |
| Fjellfrosk Media AS | Information & communication | 2018 |
| Fjellheim Bibelskole AS | Education | 2005 |
| Fjellheim Kurs-Og Misjonssenter AS | Education | 2012 |
| Fjellrypesteggen AS | | 2005 |
| Fjellufta Holding AS | Financial services | 2018 |
| FJH AS | | 2026 |
| Fjord Tours Tromsø AS | Administrative & support | 2022 |
| Fjordbooking AS | Administrative & support | 2017 |
| Fjæra AS | Real estate | 2019 |
| Flakowski Holding AS | Wholesale & retail | 2024 |
| Flamingo Records Da | Information & communication | 1995 |
| Flexitour AS | Administrative & support | 2015 |
| Flis I Fingeren AS | Construction | 2024 |
| Flishuset AS | Wholesale & retail | 1993 |
| Floating Adventure AS | Administrative & support | 2025 |
| Flokstad Invest AS | | 2025 |
| Flow Coworking AS | Real estate | 2014 |
| Flugi AS | | 2022 |
| Flytt & Vask Tromsø AS | Transport & logistics | 2024 |
| Fløifjellet Eiendom AS | Real estate | 2015 |
| Fløya Anlegg AS | Real estate | 2010 |
| Fløyfjellet AS | Real estate | 2007 |
| Fløylia AS | Real estate | 2016 |
| FMJ Eiendom AS | Real estate | 2026 |
| FO2 Nord AS | Professional & scientific | 2021 |
| FO2 Partnere AS | Real estate | 2020 |
| Food Court Tromsø AS | Hospitality | 2023 |
| Foodwanders AS | Arts & recreation | 2024 |
| Forhåpningen AS | Health & social care | 2014 |
| Forma + Studio AS | Wholesale & retail | 2026 |
| Forma Studio AS | Wholesale & retail | 2013 |
| Forsaa Holding AS | Financial services | 2016 |
| Forskningsparken Møtesenter AS | Administrative & support | 2002 |
| Forsøket Boliger AS | Real estate | 2017 |
| Fortex AS | Wholesale & retail | 2021 |
| Fortuna Regnskap AS | Professional & scientific | 2011 |
| Forvalt AS | Information & communication | 2022 |
| Fossvoll Holding AS | | 2021 |
| Fotodama AS | Professional & scientific | 2012 |
| Fotofilm AS | Professional & scientific | 2012 |
| Fotograf Fiskum AS | Professional & scientific | 2014 |
| Fox Grill Tromsø AS | Hospitality | 2017 |
| FR. Nansens Plass 17 AS | Real estate | 2020 |
| Fra Innersida AS | Professional & scientific | 2016 |
| Frabene AS | Real estate | 2012 |
| Fram Tours AS | Administrative & support | 2021 |
| Framsenteret Drift AS | Administrative & support | 1994 |
| Fransella AS | Wholesale & retail | 2021 |
| Fratil AS | Real estate | 2004 |
| Freakshow Studio AS | Information & communication | 2014 |
| Fredrik Langes Gate 20 AS | Real estate | 1947 |
| Fredrik Langes GT 19/21 AS | Real estate | 2012 |
| Fredval AS | | 2023 |
| Freno AS | Transport & logistics | 1992 |
| Freno Eiendom AS | Real estate | 2005 |
| Friborg AS | Real estate | 2000 |
| Fridtjof Nansens Plass 4 AS | Real estate | 2019 |
| Friisern Holding AS | | 2025 |
| Friluftsbutikken AS | Wholesale & retail | 2006 |
| Fristad Utvikling AS | | 2019 |
| Frisørhuset Da | Other services | 2003 |
| FRN Investeringer AS | Real estate | 2024 |
| Frode Brox AS | Wholesale & retail | 2005 |
| Front Boligentreprenør AS | Construction | 2022 |
| Front Boliginvest AS | Real estate | 2023 |
| Front Facilities AS | Construction | 2021 |
| Front Forvaltning AS | Real estate | 2018 |
| Front Maskinentreprenør AS | Real estate | 2024 |
| Front Prosjekt AS | Real estate | 2016 |
| Front Utvikling AS | Real estate | 2006 |
| Frost Frisør AS | Other services | 2014 |
| Frotac AS | Professional & scientific | 2023 |
| Fruholmen Holding AS | | 2015 |
| Fruholmen Invest AS | Agriculture & fishing | 2018 |
| Fruholmen Invest II AS | Real estate | 2018 |
| Fruholmen Seafood 2 AS | Agriculture & fishing | 2015 |
| Fruholmen Seafood AS | Agriculture & fishing | 2009 |
| Fryd Kafé & Interiør AS | Hospitality | 2017 |
| Frydenbø Industri Tromsø AS | Construction | 2019 |
| Frydenlundsgata 11 Narvik AS | Real estate | 2020 |
| Fugas AS | Construction | 2018 |