| Grefsenveien 61 AS | Real estate | 2006 |
| Grefsenveien 64 AS | Real estate | 2021 |
| Grefsenveien 90 Holding AS | | 2025 |
| Grefsrødhavna Holding AS | | 2021 |
| Greg Invest AS | Financial services | 2014 |
| Greg Transport AS | Transport & logistics | 2015 |
| Greger Bengson Holding AS | | 2005 |
| Gregers Kvartal Næring AS | Real estate | 2024 |
| Gregersen Investment AS | | 2019 |
| Gregersen Optikk AS | Wholesale & retail | 2014 |
| Gregory Capital AS | | 2010 |
| Gregus AS | Health & social care | 2021 |
| Gregus Productions AS | Transport & logistics | 2025 |
| Grei Energi AS | Information & communication | 2025 |
| Greidung AS | Professional & scientific | 1998 |
| Greige Invest AS | | 2025 |
| Greileie AS | Wholesale & retail | 2025 |
| Greina Trefelling AS | Agriculture & fishing | 2008 |
| Greindx AS | Professional & scientific | 2018 |
| Grejar AS | Real estate | 2011 |
| Grele AS | Financial services | 2005 |
| Gren Forlag AS | Information & communication | 1992 |
| Gren Service AS | Transport & logistics | 2023 |
| Gren Utvikling AS | Information & communication | 2021 |
| Grendahl Holding AS | Real estate | 2022 |
| Grendahl Kapital AS | Real estate | 2022 |
| Grendehuset På Sagene SA | Hospitality | 2024 |
| Grendene AS | Real estate | 1990 |
| Greni Energi AS | Professional & scientific | 2023 |
| Grenland Eiendom AS | Real estate | 2021 |
| Grenland Kombibygg AS | | 2024 |
| Grenland Logistikk Invest AS | Real estate | 2021 |
| Grenlandsporten 1 AS | Real estate | 2021 |
| Grenmar Utvikling AS | Real estate | 2007 |
| Grenness AS | | 2020 |
| Grens Rør & Servicetjenester AS | Construction | 2015 |
| Grenselunden Næring AS | Real estate | 2016 |
| Grenseløs Invest AS | Financial services | 2018 |
| Grenseløse AS | Other services | 2011 |
| Grenseløse Holding AS | Other services | 2023 |
| Grenseløse ST. Hanshaugen AS | Other services | 2024 |
| Grensen 10 AS | Real estate | 2014 |
| Grensen 12 AS | Real estate | 1928 |
| Grensen 12B AS | Real estate | 1993 |
| Grensen 15 Agf AS | Real estate | 2022 |
| Grensen 15 AS | Real estate | 2006 |
| Grensen 15 Holding AS | Real estate | 2017 |
| Grensen 15 Invest AS | | 2018 |
| Grensen 17 AS | Real estate | 2018 |
| Grensen 19 AS | Real estate | 1965 |
| Grensen 3 AS | Real estate | 2023 |
| Grensen 5-7 AS | Real estate | 2006 |
| Grensen 9 B AS | Real estate | 1973 |
| Grensen Butikkdrift AS | Wholesale & retail | 2015 |
| Grensen Dagligvare AS | Wholesale & retail | 2026 |
| Grensen Eiendomsinvest AS | Real estate | 2021 |
| Grensen Eiendomsinvest Holding AS | Real estate | 2021 |
| Grensen Fysikalske Institutt AS | Health & social care | 1991 |
| Grensen Invest AS | Financial services | 2005 |
| Grensen Retail AS | Wholesale & retail | 2011 |
| Grensen Sko Holding AS | Wholesale & retail | 1998 |
| Grensen Sko Stovner AS | Wholesale & retail | 2007 |
| Grensen Thunes Vei Holding AS | Real estate | 2023 |
| Grensesvingen 26 AS | Real estate | 2019 |
| Grensesvingen 7 Eiendom AS | Real estate | 2005 |
| Grenseveien 10 Invest AS | Real estate | 2014 |
| Grenseveien 107 AS | Real estate | 1995 |
| Grenseveien 107 Invest AS | Real estate | 2018 |
| Grenseveien 6 AS | Real estate | 2017 |
| Grenseveien 61 Næring AS | Real estate | 2016 |
| Grenseveien 69 AS | Real estate | 2011 |
| Grenseveien 73 Og 91 AS | Real estate | 2014 |
| Grenseveien 74 Holding AS | Real estate | 2018 |
| Grenseveien 74 Oslo AS | Real estate | 2020 |
| Grenseveien 78B AS | Real estate | 2017 |
| Grenseveien 82 AS | Real estate | 2017 |
| Grenseveien 97 Bolig AS | Real estate | 2017 |
| Grenseveien 99 AS | Real estate | 2017 |
| Grenseveien Næringsbygg AS | Real estate | 2007 |
| Grenseveien Panorama AS | Real estate | 2018 |
| Grenseveien Undervisningsbygg AS | Real estate | 2020 |
| Grenstølveien 40 AS | Real estate | 2012 |
| Grenvik Musicianship AS | Arts & recreation | 2023 |
| Grep Campo AS | Hospitality | 2021 |
| Grep Combo AS | Real estate | 2013 |
| Grep Tech Invest I AS | Real estate | 2017 |
| Grep Ultra AS | Professional & scientific | 2013 |
| Grepa Byggservice AS | Construction | 2002 |
| Grepet AS | | 2019 |
| Grepko Ans | Real estate | 1989 |
| Grepperud-Frenning AS | | 2021 |
| Greppolini Investo AS | Financial services | 2016 |
| Gres Investment AS | | 2024 |
| Gresk / Arm. Interiørdesign Ans | Professional & scientific | 2008 |
| Gress Gruppen AS | Wholesale & retail | 1997 |
| Gress Oslo AS | Professional & scientific | 2010 |
| Gressholmen AS | Hospitality | 2025 |
| Gressholmen Kro AS | Hospitality | 2016 |
| Gresshoppa Industribygg AS | Real estate | 1961 |
| Gresshoppa Trykk Og Profil AS | Wholesale & retail | 2010 |