| Flateland Invest AS | Professional & scientific | 2023 |
| FM Eiendom AS | Real estate | 2022 |
| FM Eiendom Holding AS | Real estate | 2022 |
| FMV Infrastruktur AS | Real estate | 2010 |
| FMV Modellager AS | Real estate | 2023 |
| Forglemmegei Reklame Tynset AS | Professional & scientific | 2021 |
| Forhandler.No AS | Information & communication | 2010 |
| Fossedal Trafikkskole AS | Education | 2025 |
| Fotograf Sara Johannessen AS | Professional & scientific | 2014 |
| Fotspor Barnehage AS | Education | 2015 |
| Fracture AS | Information & communication | 2026 |
| Fred Jensen Holding AS | | 2023 |
| Fredrikstad Bygg & Eiendom Ans | Professional & scientific | 2001 |
| Fredrikstad Fotballinvest AS | Arts & recreation | 1997 |
| Fredrikstad Garn AS | Wholesale & retail | 2024 |
| Fredrikstad Hjertesenter AS | Health & social care | 2015 |
| Fredrikstad Idrettspark AS | Real estate | 2025 |
| Fredrikstad Kjøle Montage AS | Construction | 2016 |
| Fredrikstad Klokker Og Smykker AS | Wholesale & retail | 2024 |
| Fredrikstad Kultur AS | Arts & recreation | 2013 |
| Fredrikstad Properties AS | Real estate | 2024 |
| Fredrikstad Real Estate AS | | 2024 |
| Fredrikstad Restaurantdrift AS | Hospitality | 2015 |
| Fredrikstad Tannlegesenter AS | Health & social care | 2017 |
| Fredrikstad Treningssenter AS | Arts & recreation | 2026 |
| Fredrikstad Underholdning AS | Hospitality | 2009 |
| Fredrikstad Vann Varme Og Sanitær AS | Construction | 1993 |
| Fremoverlente AS | Professional & scientific | 2018 |
| Frenika Invest AS | Financial services | 2017 |
| Frost Marketing AS | Professional & scientific | 2025 |
| Fruit Distribution AS | Professional & scientific | 2010 |
| Funktion & Form AS | Professional & scientific | 2009 |
| Gabriel Seyfert AS | Professional & scientific | 2017 |
| Gabriel Seyfert Sport AS | Wholesale & retail | 2017 |
| Gamle Raadhusgaten 17 AS | Real estate | 2012 |
| Gamlebyen Selskapslokaler AS | Real estate | 2021 |
| Gamlem Eiendom AS | Administrative & support | 2015 |
| Gannet Marine Group AS | Wholesale & retail | 2024 |
| Gastroteket AS | Hospitality | 2026 |
| GBJ Admin Service AS | Professional & scientific | 1987 |
| GFV Invest AS | | 2019 |
| Glemmengata 55 AS | Real estate | 2021 |
| GLJ AS | | 2023 |
| Glombo Barnehage AS | Education | 2008 |
| Glombo Brygge AS | Real estate | 2021 |
| Glombo Holding AS | Real estate | 2021 |
| Glombo Utvikling 1 AS | Real estate | 2013 |
| Glombo Utvikling 2 AS | Real estate | 2012 |
| Glommen Brygge AS | Real estate | 1975 |
| Glommen Eiendom Invest I AS | Real estate | 2007 |
| Glow Hair AS | Other services | 2025 |
| GP Bygg Og Håndverkstjenester AS | Construction | 2023 |
| GR Elektro AS | Construction | 2019 |
| Graahuset AS | Professional & scientific | 2023 |
| Green 8 Technology AS | Professional & scientific | 2003 |
| Greenedge Strategi Og Ledelse AS | Professional & scientific | 2024 |
| Griff Arkitektur AS | Professional & scientific | 2004 |
| Griffin Invest AS | Information & communication | 2017 |
| Groff Holding AS | | 2026 |
| Grundstenen AS | Real estate | 1989 |
| Gudmestad AS | Real estate | 2011 |
| Gullsmed Truls Ambjørnsen AS | Wholesale & retail | 1979 |
| Gulltann Holding AS | Financial services | 2016 |
| Gustavsens Auto AS | Real estate | 2002 |
| Gusto Gusto AS | Professional & scientific | 2006 |
| Gyller Prosjekt AS | Professional & scientific | 2021 |
| Had Holding AS | Wholesale & retail | 2020 |
| Hagesæther AS | Health & social care | 2015 |
| Haka 9 Holding AS | | 2026 |
| Hal Holding AS | | 2008 |
| Hald AS | | 2019 |
| Halvkong AS | Wholesale & retail | 2023 |
| Halvorsrødfeltet Vann & Avløp AS | Water & waste | 2003 |
| Hauer Eiendom AS | Real estate | 2022 |
| Havfolk Holding AS | | 2022 |
| Hcag Holding AS | Information & communication | 2005 |
| He-Li-The Holding AS | Real estate | 2005 |
| Heimdal Håndverk AS | Construction | 2026 |
| Helge Olimb AS | Real estate | 2012 |
| Hellstrøm AS | | 2026 |
| Helsedietten AS | Health & social care | 2017 |
| Helselaboratoriet AS | Health & social care | 2024 |
| Hembre Invest AS | Health & social care | 2020 |
| Henrichsen Rørlegger Service AS | Construction | 2010 |
| Henrik Bjerke Holding AS | | 2020 |
| Henriksen Haltli AS | Arts & recreation | 2019 |
| Henwic AS | Professional & scientific | 2016 |
| Hermansen & Vormdal AS | Professional & scientific | 2014 |
| HGS AS | Professional & scientific | 2020 |
| Hildes Holding AS | | 2026 |
| Hit on Hit AS | Manufacturing | 2019 |
| Hjorth Tollefsen Holding AS | | 2022 |
| Hka Holding AS | Financial services | 2016 |
| HM Montasje AS | Construction | 2015 |
| Holteåsen Holding AS | | 2005 |
| Hornvin AS | | 2020 |
| Hotcoffee AS | Wholesale & retail | 2014 |
| HPD AS | | 2022 |
| HS Arealplan AS | Professional & scientific | 2021 |
| HS Holdingselskap AS | Professional & scientific | 2021 |