| Fornebu Eiendom AS | Real estate | 1997 |
| Fornebu Forvaltning AS | Professional & scientific | 2017 |
| Fornebu Gateway AS | Real estate | 2012 |
| Fornebu Hovedgaard AS | Real estate | 2019 |
| Fornebu Invest 38 AS | Real estate | 2024 |
| Fornebu Kontorinvest AS | Real estate | 2018 |
| Fornebu Næringseiendom 1 AS | Real estate | 2007 |
| Fornebu Næringseiendom Ans | Real estate | 1999 |
| Fornebu Og Omegn Eiendom AS | Real estate | 2016 |
| Fornebu Park Hotel AS | Real estate | 1984 |
| Fornebu Senter AS | Real estate | 2007 |
| Fornebu Sentrum AS | Real estate | 2016 |
| Fornebu Sentrum Utvikling AS | Real estate | 2017 |
| Fornebu Strandsone AS | Real estate | 2016 |
| Fornebuhøyden Holding AS | Real estate | 2020 |
| Fornebuhøyden Utvikling AS | Real estate | 2022 |
| Fornebuporten Næring 1 AS | Real estate | 2012 |
| Fornebuporten Næring 2 AS | Real estate | 2012 |
| Fornebuporten Næring 3 AS | Real estate | 2012 |
| Fornebuveien 1-3 AS | Real estate | 2016 |
| Fornebuveien 1-3 Holding AS | Real estate | 2022 |
| Fornebuveien 1-3 Kontorhotell AS | Real estate | 2022 |
| Fornebuveien 42-48 AS | Real estate | 2016 |
| Fornebuveien 7-13 AS | Real estate | 2010 |
| Fornebuveien AS | Real estate | 2016 |
| Fornebuveien Boligutvikling AS | Real estate | 2024 |
| Fornebuveien Kontorbygg AS | Real estate | 2016 |
| Fornem AS | Administrative & support | 2026 |
| Fornes Invest AS | Education | 2005 |
| Fornet AS | Professional & scientific | 2003 |
| Fornost AS | Information & communication | 2012 |
| Forny Rådgivning AS | Professional & scientific | 2026 |
| Fornybar Utvikling AS | Professional & scientific | 2024 |
| Fornybarakademiet AS | Other services | 2000 |
| Fornyelse Gruppen AS | Construction | 2016 |
| Forr Eiendom AS | Real estate | 2018 |
| Forra AS | Financial services | 2005 |
| Forra Ultramax AS | Transport & logistics | 2021 |
| Forren AS | Financial services | 2013 |
| Forretnings-Bygg AS | Real estate | 2017 |
| Forretningsføreren AS | Real estate | 2001 |
| Forrådskammerset AS | Professional & scientific | 2021 |
| Forsakringsaktiebolaget Agria (Publ) Nuf | Financial services | 2004 |
| Forsbergs Montage Fomab I Eda AB Ur | Construction | 1996 |
| Forse AS | Information & communication | 2014 |
| Forselv Holding AS | Information & communication | 2013 |
| Forselvveien AS | Real estate | 2025 |
| Forsikra AS | Information & communication | 2025 |
| Forsikringshuset Oslo AS | | 1989 |
| Forsikringshuset Oslo Eiendom AS | Financial services | 2015 |
| Forsikringspartner AS | | 1997 |
| FORSIKRINGSPARTNER1 AS | Financial services | 2005 |
| Forsikringstakst AS | Professional & scientific | 2023 |
| Forskerfabrikken AS | Education | 2014 |
| Forskjønnelsen 4 AS | Real estate | 2017 |
| Forskjønnelsen Invest AS | Real estate | 2013 |
| Forskning Og Innovasjon Invest AS | Health & social care | 2017 |
| Forskningsparken Drift AS | Real estate | 2001 |
| Forskningsparken Energi AS | Real estate | 2009 |
| Forskningsparken Hus 5 AS | Real estate | 2014 |
| Forskningsparken Montessori AS | Education | 1990 |
| Forskningsveien AS | Professional & scientific | 2016 |
| Forskningsveien Holding AS | Real estate | 2016 |
| Forskningsveien II AS | Real estate | 2016 |
| Forsler Rederi AB | Transport & logistics | 2001 |
| Forsprang Energi AS | Professional & scientific | 2024 |
| Forsta AS | Information & communication | 1996 |
| Forsta Bidco AS | Professional & scientific | 2019 |
| Forstaden Eiendom AS | Real estate | 2019 |
| Forstaden Grua Boligutvikling AS | Real estate | 2020 |
| Forstaden Holding AS | Real estate | 2020 |
| Forstaden Malmgruben Boligutvikling AS | Real estate | 2020 |
| Forstaden Sørli Boligutvikling AS | Real estate | 2020 |
| Forstadsutvikling AS | Real estate | 2017 |
| Forsterk AS | Information & communication | 2023 |
| Forsythia Forlag AS | Information & communication | 1997 |
| Forså Holdings AS | | 2026 |
| Fort Debér AS | Information & communication | 2023 |
| Forte Digital AS | Information & communication | 2017 |
| Forte Energy Norway AS | Energy | 2020 |
| Forte Group AS | Information & communication | 2022 |
| Forte Holding AS | Information & communication | 2023 |
| Forte Hub AS | Information & communication | 2020 |
| Forte Incubator AS | Information & communication | 2018 |
| Forte Optimize AS | Professional & scientific | 2021 |
| Forte Solutions AS | Information & communication | 2024 |
| Forte Vannkraft AS | Energy | 1995 |
| Forte Vannkraft Produksjon 2 AS | Energy | 2023 |
| Forte Vannkraft Utvikling AS | Professional & scientific | 2014 |
| Fortes Gruppen AS | Information & communication | 2020 |
| Fortfrisk AS | Wholesale & retail | 2016 |
| Forth AS | Real estate | 2012 |
| Fortica AS | Construction | 2024 |
| Fortified Holding AS | | 2025 |
| Fortified Technologies AS | Information & communication | 2023 |
| Fortigo Properties AS | Real estate | 2019 |
| Fortinet B.V. Nuf | Information & communication | 2015 |
| Fortio AS | Professional & scientific | 2021 |
| Fortis Operations AS | Transport & logistics | 2023 |
| Fortis Shipping AS | Professional & scientific | 2025 |