| Fossevind AS | | 2025 |
| Fosshaug Stillas AS | Construction | 2007 |
| Fossheim AS | Health & social care | 1991 |
| Fossheim Bygg AS | Construction | 2006 |
| Fossheimgruppen AS | Real estate | 2007 |
| Fossi Holding AS | | 2025 |
| Fossil Norway AS | Wholesale & retail | 2000 |
| Fossland + Foss AS | Professional & scientific | 2014 |
| Fossli Family Holding AS | Education | 2017 |
| Fossli Gård Invest AS | | 2023 |
| Fossli Ventures AS | | 2025 |
| Fossnesveien 25 AS | Real estate | 2019 |
| Fossum & Co Invest AS | Real estate | 2014 |
| Fossum & Co VVS AS | Construction | 1976 |
| Fossum & Kristiansen AS | Construction | 1988 |
| Fossum 1 AS | | 2026 |
| Fossum 2 AS | | 2026 |
| Fossum 3 AS | | 2026 |
| Fossum 4 AS | | 2026 |
| Fossum 5 AS | Real estate | 2026 |
| Fossum 6 AS | Real estate | 2026 |
| Fossum 7 AS | Real estate | 2026 |
| Fossum 8 AS | Real estate | 2026 |
| Fossum 9 AS | Real estate | 2026 |
| Fossum Eiendom AS | Real estate | 1997 |
| Fossum Gårdstun AS | Real estate | 2021 |
| Fossum Media AS | Professional & scientific | 2024 |
| Fossumlunden AS | Real estate | 2018 |
| Fossumveien 68 II AS | Real estate | 2017 |
| Fossveien 13B AS | Real estate | 2018 |
| Fossveien 15 Holding AS | | 2025 |
| Fossveien 4 AS | Real estate | 2019 |
| Fossveien 9 Oslo AS | Real estate | 2024 |
| Fosswinckels Gate 67 AS | Real estate | 2023 |
| Fostal AS | Financial services | 2001 |
| Foste's Emea Limited | Wholesale & retail | 2007 |
| Fot & Bedring Da | Arts & recreation | 1998 |
| Fot-Helse AS | Health & social care | 2022 |
| Fotball Media Herrer AS | Information & communication | 2008 |
| Fotball Media Kvinner AS | Administrative & support | 2023 |
| Fotball.Tv AS | Information & communication | 2020 |
| Fotballbilletter AS | Administrative & support | 2025 |
| Fotballeventyret AS | Administrative & support | 2025 |
| Fotballfeber AS | Arts & recreation | 2018 |
| Fotballfesten AS | Arts & recreation | 2007 |
| Fotballkanalen AS | | 2017 |
| Fotballshop AS | Wholesale & retail | 1973 |
| Fotballshop Oslo City AS | Wholesale & retail | 2016 |
| Fotballshop Sandvika Storsenter AS | Wholesale & retail | 2011 |
| Fotballshop Strømmen Storsenter AS | Wholesale & retail | 2012 |
| Fotballshop Ullevaal Stadion AS | Wholesale & retail | 1984 |
| Fotballtelefonen Da | Other services | 1991 |
| Fotbjorn AS | Professional & scientific | 2023 |
| Fotefar AS | Financial services | 2008 |
| Foteksperten AS | Health & social care | 2020 |
| Fotenbukta Vann- Og Avløp AS | Water & waste | 2006 |
| Fotihose AS | Manufacturing | 2018 |
| Foto Holding AS | Wholesale & retail | 2023 |
| Foto Studio Utleie AS | Real estate | 2015 |
| Fotoal AS | Information & communication | 2024 |
| Fotobaren AS | Professional & scientific | 2014 |
| Fotograf Andrea Gjestvang AS | Professional & scientific | 2023 |
| Fotograf Anne Bråtveit AS | Professional & scientific | 2020 |
| Fotograf Christian Houge AS | Professional & scientific | 2013 |
| Fotograf Estensen AS | Professional & scientific | 2022 |
| Fotograf Ingar Sørensen Nuf | Professional & scientific | 2011 |
| Fotograf Jan William Fines AS | Professional & scientific | 2021 |
| Fotograf Lisa Westgaard AS | Professional & scientific | 1997 |
| Fotograf Margaret M. De Lange AS | Professional & scientific | 2004 |
| Fotograf Marit Andersen AS | Professional & scientific | 2025 |
| Fotograf Mathias Fossum AS | Professional & scientific | 2014 |
| Fotograf Mats Holst AS | Professional & scientific | 2013 |
| Fotograf Nadia Frantsen AS | Professional & scientific | 2015 |
| Fotograf Ole Walter Jacobsen AS | Professional & scientific | 2007 |
| Fotograf Petter Schive AS | Professional & scientific | 2024 |
| Fotograf Pia Bråthen AS | Professional & scientific | 2024 |
| Fotograf S. Bråthen AS | Professional & scientific | 2015 |
| Fotograf Sune Eriksen AS | Professional & scientific | 2015 |
| Fotograf Thonrud AS | Professional & scientific | 1987 |
| Fotograf Tom Hansen AS | Professional & scientific | 1998 |
| Fotograf Ørnelund AS | Professional & scientific | 1967 |
| Fotografene Lillian & Lena Da | Professional & scientific | 2008 |
| Fotohuset Oslo AS | Wholesale & retail | 2023 |
| Fotokassa Norge AS | Professional & scientific | 2018 |
| Fotonett Ans | Wholesale & retail | 1999 |
| Fotonika AS | Other services | 2015 |
| Fotopapir AS | Wholesale & retail | 2025 |
| Fotophono AS | Professional & scientific | 2011 |
| Fotorune AS | Professional & scientific | 2023 |
| Fotoware AS | Information & communication | 1997 |
| Fotoware Holding AS | Information & communication | 2019 |
| Fotterapi Klinikk AS | Health & social care | 2024 |
| Fotterapi Og Sykepleie AS | Health & social care | 2024 |
| Fotterapiklinikken AS | Health & social care | 1938 |
| Fottland Holding AS | Arts & recreation | 2016 |
| Fougner Invest AS | Financial services | 2005 |
| Founders & Co AS | Professional & scientific | 2020 |
| Founders & Fools Deal 1 AS | Information & communication | 2021 |
| Founders & Fools Deal 3 AS | Information & communication | 2021 |
| Founders & Fools Deal 4 AS | | 2021 |