| Fossegrenda 26 AS | Real estate | 1989 |
| Fossegrenda 30B AS | Real estate | 2008 |
| Fossegrenda 38 a Og B AS | Real estate | 1988 |
| Fossegrenda 40 AS | Real estate | 1997 |
| Fossegrenda 42 AS | Real estate | 2012 |
| Fossegrenda 7B AS | Real estate | 2014 |
| Fossegrenda 9 AS | Real estate | 2005 |
| Fossegrenda Barnehage AS | Education | 2022 |
| Fossegrenda Bilpleie AS | Other services | 2018 |
| Fossegrenda Dagligvare AS | Wholesale & retail | 2026 |
| Fossegrenda Eiendom AS | Real estate | 2014 |
| Fossekallen Elektro AS | Construction | 2024 |
| Fossen Eiendom AS | Real estate | 1986 |
| Fotballutvikling Trøndelag AS | Education | 2012 |
| Foto Import Nystuen & Frantzen | Wholesale & retail | 1984 |
| Fotograf Stenvig AS | Professional & scientific | 2022 |
| Fotograf Øyvind Blomstereng | Professional & scientific | 2013 |
| Fotoimport AS | Wholesale & retail | 1996 |
| Fotolab.No AS | Wholesale & retail | 2019 |
| Fotspesialisten AS | Other services | 2021 |
| Fotspesialisten Klinikk Elin AS | | 2006 |
| Fox Eiendom AS | | 2017 |
| Fox Grill Nordre AS | Hospitality | 2013 |
| Fox Grill Solsiden AS | Hospitality | 2009 |
| Fox Holding AS | Hospitality | 2017 |
| Foxy Orkester Da | Arts & recreation | 1996 |
| FR Bygg AS | Construction | 2019 |
| Fraga AS | | 2020 |
| Fragola AS | Administrative & support | 2010 |
| Fragrance of Norway AS | Wholesale & retail | 2019 |
| Fram I Skoa AS | | 2026 |
| Framti Gruppen AS | Real estate | 1999 |
| Framti Production AS | Wholesale & retail | 2008 |
| Framti Unugly AS | Wholesale & retail | 2024 |
| Framti Venture AS | Real estate | 2022 |
| Framvekst AS | | 2020 |
| Frananger AS | Arts & recreation | 2023 |
| Frank Bjørkvik Holding AS | | 2023 |
| Frank Foss AS | Information & communication | 2015 |
| Frankly, Dear! Da | Information & communication | 2007 |
| Franske Nytelser AS | Manufacturing | 2005 |
| Franz Klammer Keramikkverksted AS | Manufacturing | 2021 |
| Frapa Holding AS | | 2023 |
| Frati AS | Hospitality | 1989 |
| Frati Catering AS | Hospitality | 2002 |
| Freddy Johansen Invest | | 2022 |
| Fredheim & Paulsby Bygg AS | Construction | 1997 |
| Fredhøy Invest AS | | 2025 |
| Fredmas AS | | 2023 |
| Fredrik Frost Bygg AS | Construction | 2026 |
| Fredrik Frost Holding AS | | 2026 |
| Fredrik Hoelseter AS | | 2024 |
| Fredrik Kleven Holding AS | Financial services | 2005 |
| Fredrik M Holding AS | | 2026 |
| Fredrik Martens Onarheim AS | | 2022 |
| Fredrix AS | Transport & logistics | 2021 |
| Freedom for You AS | Education | 2023 |
| Freeflow AS | | 2023 |
| Frejja Invest AS | | 2020 |
| Frekri Holding AS | Financial services | 2016 |
| Fremm Rådgiving AS | Professional & scientific | 2021 |
| Fremo Holding AS | Financial services | 2005 |
| Fremo Invest AS | Administrative & support | 2006 |
| Fremo Oppvekst AS | Administrative & support | 2019 |
| Fremogruppen AS | Administrative & support | 2005 |
| Fresh Atlantic AS | Wholesale & retail | 1990 |
| Fresh Fast Food AS | Hospitality | 2015 |
| Frestle Holding AS | Real estate | 2021 |
| Frestle Tech AS | | 2020 |
| Freva Holding AS | | 2025 |
| Frevin AS | | 2020 |
| Frida AS | Hospitality | 2007 |
| Fridheimkvartalet AS | Real estate | 2019 |
| Friends Solsiden AS | Hospitality | 2020 |
| Friends,Fools & Family AS | Financial services | 2013 |
| Friggtec AS | Professional & scientific | 2024 |
| Frigården AS | Construction | 2020 |
| Friik Marketing Nuf | Professional & scientific | 2018 |
| Frilav AS | Wholesale & retail | 2005 |
| Frimurerlogen Eiendom AS | Hospitality | 1993 |
| Frisk Fysioterapi AS | Health & social care | 2001 |
| Friskgården Nidaros AS | Health & social care | 2008 |
| Frisør Picasso AS | Other services | 2021 |
| Frisør Una AS | Other services | 2017 |
| Frisørn AS | Other services | 2011 |
| Frisørsalongen St.Olavs Hospital AS | Other services | 2008 |
| Frithjof Anderssen Invest 2 AS | | 2025 |
| Frithjof Anderssen Invest AS | Real estate | 2005 |
| Frivel Holding AS | Transport & logistics | 2015 |
| Frode Brun Solberg Holding AS | Wholesale & retail | 2005 |
| Frode Hassel AS | Real estate | 2006 |
| Frode Rinnans Veg 14-16 AS | Real estate | 2022 |
| Frogner Drift AS | Information & communication | 2008 |
| Fronttech AS | Wholesale & retail | 2022 |
| Frosk Holding AS | | 2017 |
| Frost Assets AS | | 2026 |
| Frost Eiendom AS | Real estate | 1998 |
| Frost Finans AS | Real estate | 1987 |
| Frost Holding AS | Real estate | 2016 |
| Frost Parkering AS | Real estate | 1985 |