| Gresskarene AS | Administrative & support | 2026 |
| Gressli AS | Professional & scientific | 2018 |
| Gressquel Consulting AS | Information & communication | 2021 |
| Gressøen AS | Real estate | 1996 |
| Gresvig Shipping AS | Real estate | 2007 |
| Gresvik Invest AS | | 2005 |
| Greta Og Reiduns Hobbykeramikk Ans | | 1996 |
| Grete H Berild AS | | 2020 |
| Grete Kristensen AS | Real estate | 2019 |
| Grethe Skaug AS | Real estate | 2025 |
| Grethes Hus AS | Education | 2011 |
| Grev Wedels Plass Auksjoner AS | Wholesale & retail | 1992 |
| Grev Wedelsplass 7 AS | Real estate | 2010 |
| Greve Holding AS | | 2022 |
| Greve Kapital AS | Information & communication | 2022 |
| Grevens Tid AS | Professional & scientific | 2024 |
| Greverud Utvikling AS | Real estate | 2006 |
| Greveskogen Eiendom AS | Real estate | 2021 |
| Greveskogen Næring AS | Real estate | 2022 |
| Greveskogen Næring Prosjekt 4 AS | Real estate | 2025 |
| Greveskogen Utleie AS | Real estate | 2021 |
| Greveskogen Utvikling AS | Real estate | 2018 |
| Grevinst AS | | 2026 |
| Grevis AS | Health & social care | 2022 |
| Grevlingen AS | Hospitality | 2025 |
| Grevlog AS | | 2022 |
| Grey AS | Wholesale & retail | 2026 |
| Grey Holding AS | Financial services | 2017 |
| Grey Intelligence AS | Information & communication | 2026 |
| Greyhound AS | Professional & scientific | 2019 |
| Greyjay AS | | 2021 |
| Greystone Holding AS | | 2025 |
| Greystones AS | | 2022 |
| Grezza AS | Hospitality | 2024 |
| Greåker Eiendom Ans | Real estate | 2003 |
| Greåker Industrier AS | | 2016 |
| GRG 3 AS | Real estate | 2012 |
| GRG Invest AS | Real estate | 2020 |
| Gri AS | Financial services | 2015 |
| Grid Branding AS | Professional & scientific | 2000 |
| Grid Invest AS | | 2022 |
| Gridcore Energy Storage AS | Energy | 2022 |
| Gridos Utility AS | Information & communication | 2026 |
| Gridscope AS | Information & communication | 2026 |
| Gridshot Studio AS | Professional & scientific | 2024 |
| Gridy Design AS | Professional & scientific | 2019 |
| Grieg Bidco AS | Information & communication | 2020 |
| Grieg Green AS | Water & waste | 2010 |
| Grieg Holdco AS | Information & communication | 2020 |
| Grieg International II AS | Administrative & support | 2000 |
| Grieg Investor AS | Financial services | 1998 |
| Grieg Investor Holding AS | Professional & scientific | 2005 |
| Grieg Kapital AS | Agriculture & fishing | 1994 |
| Grieg Midco AS | Information & communication | 2020 |
| Grieg New Energy AS | Professional & scientific | 2024 |
| Grieg Viig Invest AS | Financial services | 2018 |
| Griffenfeldt AS | | 2014 |
| Griffin Consulting AS | Information & communication | 2020 |
| Griggastemma Utbygging AS | Real estate | 2013 |
| Grill Oslo AS | Hospitality | 2020 |
| Grillebjørn Pilsen II AS | | 2024 |
| Grillefenger AS | Information & communication | 2023 |
| Grilleriet AS | Hospitality | 2011 |
| Grillhyttespesialisten AS | Wholesale & retail | 2012 |
| Grillin AS | Hospitality | 2014 |
| Grillsjefen AS | Hospitality | 2014 |
| Grillteknikk Da | Manufacturing | 2009 |
| Grim Day Records Da | Arts & recreation | 2022 |
| Grim Utvikling AS | Real estate | 2014 |
| Grimaas Ventures AS | | 2026 |
| Grimelund Holding AS | | 2018 |
| Grimelunden AS | | 2020 |
| Grimelundshaugen 13 AS | Real estate | 2024 |
| Grimelundsveien 12 Ans | Real estate | 1998 |
| Grimelundsveien 2-6 AS | Real estate | 1989 |
| Grimleads AS | Wholesale & retail | 2014 |
| Grimm Maritime AS | Professional & scientific | 2024 |
| Grimmansmåla AS | Wholesale & retail | 2023 |
| Grimmvest AS | | 2023 |
| Grims Holding AS | Health & social care | 2013 |
| Grimsbekken AS | Information & communication | 2026 |
| Grimsby AS | Financial services | 2014 |
| Grimsgaard AS | Administrative & support | 2014 |
| Grimsgaard Holding AS | | 2021 |
| Grimshave Dagligvare AS | Wholesale & retail | 2024 |
| Grimslie Holding AS | Real estate | 2022 |
| Grimsrud Invest AS | | 2023 |
| Grimstad Eiendomsinvest AS | Real estate | 2022 |
| Grimstad Konserves Eiendom AS | Real estate | 2008 |
| Grimstad Konsult AS | Information & communication | 2009 |
| Grimstad Logistikkbygg AS | Real estate | 2020 |
| Grimstad Oppmåling AS | Professional & scientific | 2012 |
| Grimstadco AS | Information & communication | 2015 |
| Grimstvedt Invest AS | Financial services | 2006 |
| Grimstvedt Kapital AS | | 2025 |
| Grin AS | Professional & scientific | 2018 |
| Grin Holding AS | | 2019 |
| Grinaker Solutions AS | Information & communication | 2020 |
| Grindaheim AS | Hospitality | 2001 |
| Grindaker AS | Professional & scientific | 1987 |