| Fortitudo AS | Education | 2019 |
| Fortitudo Asset Management AS | Financial services | 2013 |
| Fortius Consult AS | Professional & scientific | 2022 |
| Fortius Eiendom AS | Real estate | 1998 |
| Fortius Prosjekt AS | Professional & scientific | 2015 |
| Fortknox AS | Real estate | 2007 |
| Fortotto Mover Group AS | Transport & logistics | 2024 |
| Fortress Digital AS | Information & communication | 2018 |
| Fortress Reklamebyrå AS | Professional & scientific | 1996 |
| Fortrinn Drift AS | Administrative & support | 2021 |
| Fortum Consumer Solutions AS | Energy | 2014 |
| Fortum Hedging AS | Energy | 1994 |
| Fortum Strøm AS | Energy | 2000 |
| Fortuna Bryggeri Holding AS | Manufacturing | 2015 |
| Fortuna Capital AS | | 2020 |
| Fortuna Estate AS | Real estate | 2005 |
| Fortuna Holding AS | | 2024 |
| Fortuna Interiør Da | Wholesale & retail | 1996 |
| Fortuna Invest AS | Real estate | 2015 |
| Fortuna Mare AS | Professional & scientific | 2013 |
| Fortuna Megling AS | Real estate | 1989 |
| Fortuna Technology AS | Information & communication | 2020 |
| Fortuna V AS | | 2026 |
| Fortuna Ventures AS | Wholesale & retail | 2024 |
| Fortuna Yachts Ans | Wholesale & retail | 2005 |
| Fortune AS | | 2026 |
| Fortune Finance AS | Professional & scientific | 2019 |
| FORTUNEBY40 AS | | 2024 |
| Fortus AS | Real estate | 2006 |
| Forty-Two Lights AS | Wholesale & retail | 2025 |
| Fortytwo Employeeco AS | | 2026 |
| Forum for Endring Og Begeistring AS | Arts & recreation | 2006 |
| Forum Holding AS | | 2022 |
| Forum Hotellbygg AS | Real estate | 2020 |
| Forum Moss AS | Real estate | 2007 |
| Forum Pluss AS | Real estate | 2012 |
| Forum Regnskap AS | Professional & scientific | 1996 |
| Forumoa Kompetanse AS | Professional & scientific | 2024 |
| Forus Dekkeiendom AS | Real estate | 2021 |
| Forus Forretningsbygg AS | Real estate | 2012 |
| Forus Holdco AS | Real estate | 2021 |
| Forus Holding AS | Real estate | 2006 |
| Forus Kombinasjonseiendom AS | Real estate | 2021 |
| Forus Kombinasjonseiendom II AS | Real estate | 2022 |
| Forus Property AS | Real estate | 2009 |
| Forusbeen 17 AS | Real estate | 2017 |
| Forusbeen 50 AS | Real estate | 2003 |
| Forusparken Eiendom AS | Real estate | 2006 |
| Forvalter AS | Real estate | 2006 |
| Forvaltningsprof AS | Professional & scientific | 2015 |
| Forvis Mazars Advokater AS | Professional & scientific | 2018 |
| Forvis Mazars AS | Professional & scientific | 1998 |
| Forvis Mazars Outsourcing AS | Professional & scientific | 2021 |
| Forw Norway | Transport & logistics | 2011 |
| Forwall AS | Information & communication | 2016 |
| Forward Homes AS | Construction | 2020 |
| Forward Invest AS | Construction | 2020 |
| Forward Investment Management AS | Wholesale & retail | 2001 |
| Forward Management AS | Professional & scientific | 2020 |
| Forynde AS | Wholesale & retail | 2017 |
| Forzabyshoegems AS | Wholesale & retail | 2024 |
| Forzasys AS | Information & communication | 2014 |
| Fos Holding AS | | 2025 |
| Fosb Invest AS | | 2021 |
| Fosen Holding AS | | 2020 |
| Fosen Vind Da | Energy | 2015 |
| Fosforflammer AS | Arts & recreation | 2020 |
| Fosi Holding AS | | 2020 |
| Fosnagaten 12 AS | Real estate | 1960 |
| Foss Bryggeri AS | Manufacturing | 2013 |
| Foss Capital AS | | 2023 |
| Foss Consulting AS | Professional & scientific | 2015 |
| Foss Eiendomsinvest AS | Real estate | 2025 |
| Foss Innovations AS | Information & communication | 2014 |
| Foss-Invest AS | Professional & scientific | 2001 |
| Fossagrim AS | Professional & scientific | 2021 |
| Fossdalen Kraftverk AS | Energy | 2020 |
| Fosse Dalen Eiendom AS | Real estate | 2021 |
| Fosse Dalen Invest AS | Real estate | 2021 |
| Fosse Invest AS | Real estate | 2008 |
| Fossefall Cloudco AS | Information & communication | 2026 |
| Fossefall Devco AS | Information & communication | 2026 |
| Fossefall Holding AS | Information & communication | 2025 |
| Fossefall Opco AS | Professional & scientific | 2026 |
| Fossefall Properties AS | | 2025 |
| Fossefall SPV 1 AS | Information & communication | 2026 |
| Fossefall SPV 2 AS | Real estate | 2026 |
| Fossefall SPV 3 AS | Real estate | 2026 |
| Fossefall SPV 4 AS | Real estate | 2026 |
| Fossefall SPV 5 AS | Real estate | 2026 |
| Fossekall 88 AS | Wholesale & retail | 2024 |
| Fossekall Energi AS | Professional & scientific | 2021 |
| Fossekall Invest AS | Professional & scientific | 2025 |
| Fossekallen Holding AS | Manufacturing | 2012 |
| Fossekalven AS | Transport & logistics | 2001 |
| Fossen 20 AS | Real estate | 2023 |
| Fossen AI AS | Information & communication | 2026 |
| Fosseng Eiendom AS | Real estate | 2019 |
| Fosser Capital AS | | 2025 |
| Fosser Holdco AS | | 2025 |