| Fotklinikk Werge AS | Health & social care | 2024 |
| Foto for Alle AS | Professional & scientific | 2006 |
| Foto-Expressen AS | Professional & scientific | 2012 |
| Fotograf Paul Thürmer AS | Professional & scientific | 2026 |
| FOTOHUSET-SALVESEN ANS Snefrid og Ivar Salvesen | Wholesale & retail | 1975 |
| Fotspesialisten Westerwald AS | Health & social care | 2024 |
| Foxway AS | Wholesale & retail | 2014 |
| Foxy Beauty Clinic AS | Other services | 2024 |
| Fra Naturen AS | Wholesale & retail | 2025 |
| Frage Eiendomsutvikling AS | Real estate | 2006 |
| Fraktbox AS | Transport & logistics | 2024 |
| Fral Drift SA | Water & waste | 2009 |
| Fram Climate AS | Professional & scientific | 2021 |
| Fram Innovation AS | Professional & scientific | 2020 |
| Fram Pure Energy AS | Professional & scientific | 2021 |
| Fram Reclamation Technology AS | Professional & scientific | 2021 |
| Framnes Båt & Motor AS | Manufacturing | 2013 |
| Framnes Marine AS | Manufacturing | 2014 |
| Framnesveien 23 AS | Real estate | 2020 |
| Framnæs Båthavn AS | Transport & logistics | 2008 |
| Framnæs Båtvedlikehold AS | Manufacturing | 2025 |
| Framnæs Grunnvarme AS | Energy | 2014 |
| Framnæs Maritime AS | Transport & logistics | 1977 |
| Frank P Trading AS | Wholesale & retail | 2000 |
| Freddy Invest AS | Real estate | 1997 |
| Freddy Kapitalforvaltning AS | | 2026 |
| Fredenshavn AS | Professional & scientific | 2026 |
| Frederic Peeters AS | Construction | 2018 |
| Fredhøi AS | Professional & scientific | 2015 |
| Fredhøi Invest AS | Financial services | 2018 |
| Fredrik Stangs Gate 9 AS | Real estate | 2019 |
| Fredrik Svensson AS | Manufacturing | 2015 |
| Freedom Invest & Consulting AS | Administrative & support | 2021 |
| Freja Miljø AS | Administrative & support | 2020 |
| Fresh Mote AS | Wholesale & retail | 1989 |
| Freshmo Eiendom AS | Real estate | 2003 |
| Fri AS | Information & communication | 2000 |
| Frimurergården AS | Real estate | 1976 |
| Frisk AS | Health & social care | 2023 |
| Frisk Systems AS | Information & communication | 2026 |
| Frode Grøndahl AS | Health & social care | 2005 |
| Front Brands AS | Wholesale & retail | 2018 |
| Front Corner AS | Wholesale & retail | 1986 |
| Front Sea AS | Real estate | 2018 |
| Front Senter AS | Wholesale & retail | 2025 |
| Frontier AS | Professional & scientific | 2024 |
| Frontside AS | Wholesale & retail | 2006 |
| Frostflowfitness AS | Wholesale & retail | 2023 |
| Froyko Holding AS | | 2020 |
| Fru Christensen AS | | 2025 |
| Frugensen AS | | 2023 |
| Fryd Eiendom AS | Real estate | 2007 |
| Frølich Holding AS | Financial services | 2017 |
| Frøy Økonomi AS | Professional & scientific | 2013 |
| FS Multiservice AS | Construction | 2009 |
| Fscc AS | Professional & scientific | 2019 |
| FT Klima AS | Professional & scientific | 2020 |
| Fuji Sushi Sandefjord AS | Hospitality | 2012 |
| Full Flex AS | Professional & scientific | 2018 |
| Fullt-Hus AS | Information & communication | 2023 |
| Funksjon Kjøkken AS | Wholesale & retail | 2011 |
| Funn Eiendom AS | Real estate | 2023 |
| Furu Egg AS | Wholesale & retail | 2013 |
| Furuknatten AS | | 2023 |
| Furustad Barnehage SA | Education | 1990 |
| Futura Invest AS | Real estate | 2004 |
| Future Technology - Part of Rejlers AS | Professional & scientific | 2010 |
| FV Bil Og Maskin AS | Construction | 2023 |
| Fvik Holding AS | | 2025 |
| FX Eiendom AS | Real estate | 2020 |
| Fysioklinikken Da | Health & social care | 2005 |
| Fysioterapeutene Da | Health & social care | 1994 |
| Færder Design AS | Arts & recreation | 2003 |
| Færder Mikrobryggeri AS | Wholesale & retail | 2013 |
| Færderkvartalet AS | Real estate | 2009 |
| Fønix Arbeidsinkludering AS | Health & social care | 2021 |
| Fønix AS | Health & social care | 1956 |
| Fønix Vaskeri AS | Health & social care | 2010 |
| G C Rasmussen Ans | | 1987 |
| G Capital AS | Wholesale & retail | 2020 |
| G Venture AS | Wholesale & retail | 2021 |
| G7 Holding AS | | 2025 |
| Ga Shop AS | Wholesale & retail | 2023 |
| Gafo Holding AS | Construction | 2021 |
| Gallaher Holding AS | Information & communication | 2018 |
| Galleri Er AS | Wholesale & retail | 2019 |
| Galleri M AS | Arts & recreation | 2013 |
| Game and Trade AS | Wholesale & retail | 2025 |
| Gamera AS | Wholesale & retail | 2021 |
| Gangsø Bygg AS | Professional & scientific | 2007 |
| Gangsø Kapital AS | | 2024 |
| Gapahuken Natur- Og Friluftsbarnehage AS | Education | 2004 |
| Garasjetid AS | Wholesale & retail | 2019 |
| Garn AS | Hospitality | 2026 |
| Garn Design Da | Wholesale & retail | 1999 |
| Gas Supply AS | Construction | 2006 |
| Gastromia Consulting & Invest AS | Information & communication | 2005 |
| Gastromia Kapital AS | | 2026 |
| Gaugamela AS | Financial services | 2014 |
| Gaugernakkel AS | Professional & scientific | 2024 |