| Frisørpikene Frysja AS | Other services | 2022 |
| Frisørpikene Kjelsås AS | Other services | 2020 |
| Frisørsalong Milanovic AS | Other services | 2021 |
| Frisørsalongen Hårfint AS | Other services | 1999 |
| Frithiof Holding AS | Professional & scientific | 2023 |
| Frithjof E Rasmussen AS | Wholesale & retail | 1974 |
| Fritidsguiden Da | Information & communication | 2008 |
| Fritt Fram AS | Real estate | 2007 |
| Fritt Jha AS | Arts & recreation | 2019 |
| Fritz Stinger Agenturer Ans | | 1990 |
| Fritz. AS | Professional & scientific | 2022 |
| Fritzners Gate 12 AS | Real estate | 2013 |
| Fritzvold AS | Information & communication | 2026 |
| Frius Eiendom AS | Real estate | 2023 |
| Frivillighetens Hus AS | Real estate | 2023 |
| Frivåg Invest AS | Education | 2019 |
| FRK.1.KLASSE AS | Education | 2025 |
| Frkvns AS | Professional & scientific | 2021 |
| FRL Capital AS | | 2019 |
| FRM Invest AS | | 2026 |
| Frobo AS | Real estate | 2006 |
| Frode Bjørnæs AS | Professional & scientific | 2012 |
| Frode Fjellberg AS | Professional & scientific | 1996 |
| Frode Gran Service AS | Administrative & support | 2010 |
| Frode Gran Service Drift AS | Administrative & support | 2025 |
| Frode Molnes AS | Health & social care | 2023 |
| Frode Ovland Transport AS | Transport & logistics | 2009 |
| Frode Paulsen Holding AS | | 2023 |
| Frode Stang AS | Information & communication | 2007 |
| Frode Thorvaldsen Holding AS | Wholesale & retail | 2008 |
| Frodes Holding AS | Construction | 2005 |
| Frodig AS | Hospitality | 2025 |
| Frodo Investments AS | | 2020 |
| Frog Hollow AS | Financial services | 2007 |
| Frogn Eiendomsutvikling AS | Real estate | 2024 |
| Frogn Næringspark AS | Real estate | 2010 |
| Frogndahl AS | | 2019 |
| Frogner Atrium AS | Real estate | 2017 |
| Frogner Beauty Center Ans | Other services | 1994 |
| Frogner Consulting AS | Professional & scientific | 2004 |
| Frogner Dagligvare AS | Wholesale & retail | 2023 |
| Frogner Dyreklinikk AS | Professional & scientific | 2024 |
| Frogner Dører AS | Construction | 2023 |
| Frogner Eiendom Oslo Nuf | Real estate | 2021 |
| Frogner Finans AS | Financial services | 1986 |
| Frogner Food Company Da | Manufacturing | 2023 |
| Frogner Fysioterapi & Akupunktur AS | Health & social care | 2020 |
| Frogner Grill AS | Hospitality | 2026 |
| Frogner Helsesenter AS | Health & social care | 2008 |
| Frogner House Apartments AS | Hospitality | 2009 |
| Frogner Hudklinikk AS | Health & social care | 2017 |
| Frogner Hårstudio AS | Other services | 2021 |
| Frogner Kiropraktorklinikk AS | Health & social care | 2003 |
| Frogner Lager AS | Real estate | 2022 |
| Frogner Leilighetsprosjekt AS | | 2022 |
| Frogner Loft AS | Real estate | 2024 |
| Frogner Maler & Bygg AS | Construction | 2024 |
| Frogner Nails AS | Other services | 2019 |
| Frogner Næringsinvest AS | Real estate | 2002 |
| Frogner Næringsutvikling AS | Real estate | 1969 |
| Frogner Og Bislett Bolig AS | Real estate | 2024 |
| Frogner Plass AS | Real estate | 1986 |
| Frogner Pubdrift AS | Hospitality | 2023 |
| Frogner Regnskapskontor AS | Real estate | 2013 |
| Frogner Rens Og Vask AS | Other services | 1996 |
| Frogner Sentral Utvikling AS | Real estate | 2022 |
| Frogner Sentrum AS | Real estate | 1999 |
| Frogner Spesialistsenter AS | Health & social care | 2026 |
| Frogner Sportsbar AS | Hospitality | 2017 |
| Frogner Stasjon AS | Real estate | 2022 |
| Frogner Tannhelse AS | Health & social care | 2024 |
| Frogner Tannklinikk AS | Health & social care | 2017 |
| Frogner Taxi AS | Transport & logistics | 2024 |
| Frogner Vaktmestertjenester AS | Administrative & support | 2003 |
| Frogner Verdiforvaltning AS | Real estate | 2008 |
| Frognerbekken Holding AS | Real estate | 2025 |
| Frognerbo Ans | | 1989 |
| Frognerbygg Næring AS | Real estate | 2024 |
| Frognerhjørnet AS | Real estate | 1979 |
| Frognerkilen Auto AS | Wholesale & retail | 2023 |
| Frognerkilen Barnehage AS | Education | 1989 |
| Frognerkilen Eiendom AS | Real estate | 2020 |
| Frognerkilen Facility Management AS | Administrative & support | 2016 |
| Frognerkilen Holding AS | Real estate | 2011 |
| Frognerkilen Property AS | Real estate | 2023 |
| Frognerkiosken Da | Wholesale & retail | 1991 |
| Frognerkvartalet AS | Real estate | 2001 |
| Frognerparken AS | | 2023 |
| Frognerseteren Aktivitetsbyrå AS | Arts & recreation | 2024 |
| Frognerseteren Event AS | Administrative & support | 2016 |
| Frognerseterveien 14 AS | Real estate | 1991 |
| Frognerseterveien 23 AS | Real estate | 2013 |
| Frognerseterveien 27 Eiendom AS | Real estate | 2014 |
| Frognerstrand Garasjer AS | Real estate | 2003 |
| Frognerstranda 4 AS | Real estate | 2021 |
| Frognerstranda Eiendom AS | Real estate | 1985 |
| Frognerstranda Kro AS | Hospitality | 2016 |
| Frognervassdragene AS | Real estate | 2025 |
| Frognerveien 13 AS | Real estate | 2021 |
| Frognerveien 22 Holding AS | Real estate | 2025 |