| Flatebyveien 8D - Halden AS | Real estate | 2007 |
| Flatset Holding AS | | 2025 |
| Flatås Begravelsesbyrå AS | Other services | 1986 |
| Flatås Bygg AS | Real estate | 2018 |
| Flatås Næringsbygg AS | Real estate | 1987 |
| Flatåstoppen AS | Real estate | 2013 |
| Flax Invest AS | | 2020 |
| Fleks Green Fleet 01 AS | Administrative & support | 2021 |
| Flere Sammen AS | Health & social care | 2026 |
| Flex Gym AS | Arts & recreation | 2000 |
| Flexibil AS | Administrative & support | 2012 |
| Flipper Bar AS | Hospitality | 2019 |
| Fliskonkurrenten AS | Wholesale & retail | 2004 |
| Floden AS | Real estate | 2025 |
| Floep AS | | 2026 |
| Flomo AS | Real estate | 2023 |
| Flor De Luna AS | Wholesale & retail | 2022 |
| Florida Boliginvest AS | Real estate | 2012 |
| Florum Maskin AS | Wholesale & retail | 2001 |
| Flow Assurance & Process Consult AS | Real estate | 2007 |
| Flow Dynamics Group AS | Financial services | 2005 |
| Flow Trøndelag VVS AS | Construction | 2016 |
| Flowday AS | Information & communication | 2026 |
| Flowfood AS | Manufacturing | 2016 |
| Fludo AS | | 2025 |
| Fluid Motion AS | Transport & logistics | 2025 |
| Fluidsep AS | Professional & scientific | 2016 |
| Fluks Finans AS | Professional & scientific | 2010 |
| Flux & Flow AS | Professional & scientific | 2018 |
| Flyby AS | Information & communication | 2024 |
| Flyplassveien 32 AS | Real estate | 2024 |
| Flyspray Robotics AS | Manufacturing | 2017 |
| Flyt Renhold AS | Administrative & support | 2018 |
| Flyt-Gulv AS | Construction | 2016 |
| Flytende AS | Professional & scientific | 2016 |
| Flåklypa Familiebarnehage Ans | Education | 2002 |
| Flåklypa Invest AS | Financial services | 2016 |
| Flåsætra Vann Og Avløp SA | Water & waste | 2016 |
| Flønes AS | Financial services | 2018 |
| FMB Invest AS | | 2021 |
| FMJ Finance AS | | 2020 |
| FN Gruppen AS | Transport & logistics | 2019 |
| FNF Eiendom AS | Real estate | 2026 |
| Foa AS | Professional & scientific | 2021 |
| Foc AS | Professional & scientific | 2022 |
| Focus Care AS | Administrative & support | 2006 |
| Focus Corporate AS | Professional & scientific | 2015 |
| Foda Eiendom AS | Real estate | 2004 |
| Fog AS | Real estate | 2019 |
| Foki AS | Wholesale & retail | 1925 |
| Foldal Eiendom AS | Real estate | 2019 |
| Foldal Gård AS | Agriculture & fishing | 2017 |
| Foldal Invest AS | Real estate | 2014 |
| Foldene AS | Professional & scientific | 2025 |
| Folkeinvest AS | Financial services | 2015 |
| Folkeinvest Norge AS | | 2026 |
| Fongen 1441 AS | Professional & scientific | 2008 |
| Fonics AS | Wholesale & retail | 2016 |
| Fono Fino AS | Arts & recreation | 1998 |
| Font Eiendom AS | | 2023 |
| Food Manager AS | Information & communication | 2023 |
| Foodimport AS | Wholesale & retail | 2026 |
| Football Education Nordic AS | Education | 2007 |
| Foraas Områdesikring AS | Construction | 1993 |
| Fordal Holding AS | | 2022 |
| Fore Friends AS | Arts & recreation | 2025 |
| Foreach AS | Information & communication | 2022 |
| Forenede Forvaltning AS | Financial services | 1995 |
| Forenede Holding AS | Financial services | 2011 |
| Forlaget Marvin AS | Information & communication | 2017 |
| Formidlingshuset AS | Wholesale & retail | 2023 |
| Formidlingslosen AS | Education | 2023 |
| Formo AS | Real estate | 2002 |
| Formo Bolig 1 AS | Real estate | 2019 |
| Formo Bolig 2 AS | Real estate | 2019 |
| Formo Holdings AS | Wholesale & retail | 2021 |
| Fornix AS | Information & communication | 2020 |
| Fornæss Invest AS | Real estate | 2005 |
| Forretning AS | Wholesale & retail | 2017 |
| Forretningsførsel AS | Professional & scientific | 2020 |
| Fors Invest AS | Professional & scientific | 2018 |
| Forsell Holding AS | Professional & scientific | 2015 |
| Forsells Behandlingssenter AS | | 2026 |
| Forstaden AS | Real estate | 2005 |
| Forsøkslia AS | Real estate | 2013 |
| Forsøkslia Utvikling AS | Real estate | 2021 |
| Fort Gjort AS | Professional & scientific | 2021 |
| Forthewin AS | Financial services | 2023 |
| Forto AS | Education | 2020 |
| Fortuna Europe AS | Administrative & support | 2020 |
| Fortuna Investment AS | Real estate | 2006 |
| Fosen Bolig AS | Construction | 2005 |
| Fosen Transport AS | Transport & logistics | 1998 |
| Fossegrenda 1 AS | Real estate | 2019 |
| Fossegrenda 11 AS | Real estate | 1975 |
| Fossegrenda 13 AS | Real estate | 2014 |
| Fossegrenda 15 AS | Real estate | 2021 |
| Fossegrenda 17 AS | Real estate | 2012 |
| Fossegrenda 22 AS | Real estate | 2011 |
| Fossegrenda 24 AS | Real estate | 2007 |