| Fredriksten Camping AS | Hospitality | 2025 |
| Fredriksten Festningshotell Drift AS | Hospitality | 2009 |
| Fredriksten Festningshotell Eiendom AS | Real estate | 2010 |
| Fredriksten Kroa AS | Hospitality | 2025 |
| Fredriksten Utvikling AS | Real estate | 1999 |
| Frisør Magne Langsholt AS | Other services | 2012 |
| Frisørbasaren Da | Other services | 1991 |
| Fritia AS | Health & social care | 2022 |
| Frode Kielland Invest AS | Construction | 2024 |
| Frode Olsen Holding AS | Financial services | 2005 |
| Fryden Consulting AS | Professional & scientific | 2012 |
| Fundo Gruppen AS | Real estate | 2005 |
| Furukroken Holding AS | Professional & scientific | 2011 |
| Furuvarp Holding AS | | 2022 |
| Fyr Og Flamme AS | Wholesale & retail | 2021 |
| Fyr Og Flamme Eiendom AS | Real estate | 2021 |
| Fyr Og Flamme Holding AS | Real estate | 2021 |
| G Plan AS | Professional & scientific | 2016 |
| G&G Hus AS | Wholesale & retail | 2009 |
| Ga Gruppen Holding AS | Real estate | 2015 |
| Gadget Invest AS | | 2021 |
| Gaia Balanse AS | Health & social care | 2013 |
| Galleri Lille Martine AS | Wholesale & retail | 2020 |
| Galtungveien Eiendom AS | Real estate | 2021 |
| Gamle Meieriet Halden AS | Hospitality | 2013 |
| Gao Holding AS | | 2023 |
| Garantell AB | Wholesale & retail | 2012 |
| Garasjekos AS | Wholesale & retail | 2021 |
| Garnhild AS | Wholesale & retail | 2026 |
| Garntorget AS | Wholesale & retail | 2026 |
| Gassafe AS | Manufacturing | 2021 |
| Gaus Consult AS | Health & social care | 2002 |
| Gaus Consult Eiendom AS | Real estate | 2025 |
| Gausta Fjellhytter AS | Real estate | 2021 |
| Geeks Esport AS | Administrative & support | 2016 |
| Geiranger Investments AS | | 2021 |
| General Auto AS | Wholesale & retail | 2021 |
| Gerd Holms Eftf. AS | Wholesale & retail | 2009 |
| Getrud Holding AS | Real estate | 2005 |
| GG Bolig AS | Real estate | 1991 |
| GG Gruppen AS | Real estate | 2010 |
| GG Næring AS | Real estate | 2000 |
| Gibbs AS | Information & communication | 2019 |
| Giraffen Ans | Wholesale & retail | 1998 |
| Gj-Invest AS | Real estate | 2018 |
| Glasomera I Alingsås AB | Construction | 2008 |
| Glenne Billakkering AS | Other services | 2004 |
| Glenne Eiendom Holding AS | Real estate | 2007 |
| Glenne Holding AS | Real estate | 2005 |
| Glenne Karosseri AS | Other services | 2026 |
| GLIDE2GO AS | Wholesale & retail | 2024 |
| Global Transportservice AS | Transport & logistics | 2024 |
| Gloms AS | | 2025 |
| Glomsrød Eiendom AS | Real estate | 1997 |
| Glomsrød Maskin AS | Manufacturing | 2021 |
| Glomsrød Mekanisk Verksted AS | Manufacturing | 1990 |
| GM Bygg Og Eiendomsutvikling AS | Construction | 2020 |
| GM Eksotisk Mat Da | Wholesale & retail | 1999 |
| Go Cut AS | Other services | 2019 |
| Goalpine Da | Administrative & support | 2004 |
| Golden Barbershop AS | Other services | 2025 |
| Gowme AS | Information & communication | 2026 |
| GP Digital AS | Wholesale & retail | 2020 |
| GP Marked AS | Professional & scientific | 2007 |
| GP Økonomi AS | Professional & scientific | 2000 |
| Gp-Gruppen AS | Real estate | 1993 |
| Granada AS | Transport & logistics | 2020 |
| Grand Bar AS | Hospitality | 2020 |
| Grandahl Holding AS | | 2023 |
| Grandahl Rør AS | Construction | 2023 |
| Grandahl Utleie AS | Real estate | 2020 |
| Granholt Bygg AS | Construction | 2023 |
| Granstrøm Eiendom AS | Real estate | 2012 |
| Gregory-Stærk AS | Arts & recreation | 2017 |
| Grensa AS | | 2024 |
| Grensbygg Da | Manufacturing | 1999 |
| Grensen Advokater AS | Professional & scientific | 2023 |
| Grensen Discgolf AS | Arts & recreation | 2021 |
| Grensen Eiendomsutvikling AS | | 2009 |
| Grensen Fysioterapi AS | Health & social care | 2014 |
| Grimsrud Holding AS | Manufacturing | 2005 |
| Grimsrød Skogdrift AS | Agriculture & fishing | 2021 |
| Grimsrød Tomtefelt AS | Real estate | 2017 |
| Grimsrødhøgda 1 AS | Real estate | 2025 |
| Grimsøen Entreprenør AS | Construction | 2020 |
| Grinda Bolig AS | Real estate | 2020 |
| Grinnbo Hansen AS | Wholesale & retail | 2022 |
| Gruveveien SA | Real estate | 2026 |
| Grønebakkin 11 AS | Real estate | 2018 |
| Grønland Brygge Eiendom AS | Real estate | 2017 |
| Grønn Visjon AS | Wholesale & retail | 2020 |
| GSG Torget AS | Wholesale & retail | 2007 |
| GSM Skog AS | Agriculture & fishing | 2019 |
| GT Investa AS | Real estate | 2018 |
| GT Marcus Thranes Gate AS | Real estate | 2018 |
| GT Næringsrød AS | Real estate | 2017 |
| GT Prosjekt AS | Real estate | 2019 |
| GTS Fasadevask AS | Administrative & support | 2022 |
| Gullsmed Camilla AS | Professional & scientific | 2007 |
| Gundersen & Grimsmo AS | Construction | 2024 |