| Gaustad Eiendom AS | Real estate | 2024 |
| Gaustafront AS | Real estate | 2005 |
| Gdi Holding AS | Manufacturing | 2023 |
| Ge-Pe AS | Education | 2009 |
| Gegoraf AS | Wholesale & retail | 2005 |
| Geir Bjørnum Kristiansen AS | Health & social care | 2006 |
| Geir Skeie AS | Other services | 2007 |
| Gelbro Invest AS | Real estate | 2006 |
| Gemini AS | Real estate | 1991 |
| Gemini Holding AS | | 2022 |
| General Communication AS | Real estate | 1995 |
| Genie Holding AS | | 2018 |
| Genie IT Solutions AS | Information & communication | 2018 |
| Genuine Consulting AS | Information & communication | 2015 |
| Geodataanalytics AS | Professional & scientific | 2013 |
| Geri Ans | Hospitality | 1989 |
| Get Branded AS | Information & communication | 2007 |
| Geto AS | Real estate | 2022 |
| Geto Holding AS | Real estate | 2021 |
| Geto Nordic Logitsics Da | Professional & scientific | 2007 |
| Geø AS | Professional & scientific | 2005 |
| Gfoto AS | Professional & scientific | 2015 |
| GGG AS | | 2021 |
| Gglandskap AS | Professional & scientific | 2015 |
| Gibtech AS | Construction | 2013 |
| Gidra AS | | 2026 |
| Gigahost AS | Information & communication | 2024 |
| Gigahost Datacenters AS | | 2026 |
| Gimle Holding AS | | 2026 |
| Gismo Holding AS | Construction | 2020 |
| Gjekstad Mat AS | Wholesale & retail | 2020 |
| Gjekstadveien 5 AS | Real estate | 2010 |
| Gjermundsen Bilsenter AS | Other services | 1965 |
| Gjertsen Eiendom AS | Real estate | 2020 |
| Gjertsen Invest AS | Real estate | 2019 |
| Gjertsen Sport AS | Wholesale & retail | 1993 |
| Gjone Holding AS | | 2021 |
| Gjotech AS | Financial services | 2016 |
| Gk-Hb Consulting AS | Education | 1989 |
| GL Eiendom AS | Real estate | 2017 |
| GL Invest AS | Financial services | 2005 |
| GL Transport Og Flyttebyrå AS | Transport & logistics | 2020 |
| Gla Executive AS | Education | 2015 |
| Glasshytta Harvik Og Karlsen Da | Manufacturing | 1995 |
| Glassmester Kai Dysthe AS | Construction | 2016 |
| Gleco AS | Real estate | 2005 |
| Glede Holding AS | Real estate | 2019 |
| Gleditsch Fargehandel AS | Wholesale & retail | 2010 |
| Gleditschgården Legesenter AS | Health & social care | 2010 |
| Glhf Invest AS | | 2023 |
| Glittenberg Consult AS | Education | 2020 |
| Global Data Ans | Information & communication | 2000 |
| Global Miljø AS | Water & waste | 2023 |
| Global Water Treatment AS | Manufacturing | 2024 |
| Glova Holding Da | Administrative & support | 2021 |
| GN Skredder AS | Manufacturing | 2015 |
| Gneisveien 10 AS | Real estate | 2006 |
| Gneisveien 12 AS | Real estate | 2022 |
| Gneisveien 14B AS | Real estate | 2008 |
| Gneisveien 6 AS | Real estate | 2015 |
| Gneisveien 8 AS | Real estate | 1959 |
| Gneisveien 8 Holding AS | Real estate | 2016 |
| Gnist Xxiii AS | Real estate | 2023 |
| Gode Minner AS | Real estate | 2003 |
| Godt Grep AS | Education | 2024 |
| Godtkjøp AS | Professional & scientific | 2018 |
| Gogstad Byggentreprenør AS | Construction | 2016 |
| Gokstad Akademiet AS | Education | 2017 |
| Gokstad AS | Professional & scientific | 1997 |
| Gokstad Gård AS | Hospitality | 2009 |
| Gokstad Invest AS | Real estate | 2019 |
| Gokstad Marine AS | Transport & logistics | 2012 |
| Gokstad Trafikkskole AS | Education | 2024 |
| Gokstad Utdanning AS | Education | 2024 |
| Gokstadapotekene AS | Wholesale & retail | 1998 |
| Gokstadveien 14 - 16 AS | Real estate | 1996 |
| Gokstadveien 18 AS | Real estate | 2000 |
| Golden Indisk Restaurant AS | Hospitality | 2014 |
| Golden Tiger AS | Hospitality | 2024 |
| Golfstream AS | Administrative & support | 2012 |
| Gonvik Eiendom AS | Real estate | 2019 |
| Good Feelings AS | Administrative & support | 2024 |
| Good Holding AS | Financial services | 2013 |
| Goodbyte AS | Information & communication | 2020 |
| Gorbygg AS | Construction | 2021 |
| GPR Invest AS | Wholesale & retail | 2022 |
| GPT Hågasletta 10 AS | Real estate | 2026 |
| Gran Canaria Ferieboliger AS | Real estate | 2009 |
| Grand Cafe & Restaurant AS | Hospitality | 2012 |
| Granerød Granerød Og Ekenes Eiendom AS | Real estate | 1998 |
| Granerød Truong Eiendom AS | Financial services | 2012 |
| Granholmen AS | Hospitality | 2012 |
| Granholmen Vest Bolig AS | Real estate | 2016 |
| Granitt AS | Real estate | 2005 |
| Granly Invest AS | Real estate | 2000 |
| Grans Bryggeri AS | Manufacturing | 2001 |
| Grans Eiendom AS | Real estate | 1977 |
| Grans Invest AS | Real estate | 2005 |
| Gravefirmaet Anton Almehagen AS | Construction | 2023 |
| Greenit AS | Information & communication | 2003 |