| G&W Consulting AS | Professional & scientific | 2012 |
| G-Rud Consulting AS | Education | 2012 |
| G5J Group AS | Real estate | 2006 |
| Gaasehud AS | Health & social care | 2006 |
| Gaid Invest AS | Professional & scientific | 2012 |
| Gain Solutions AS | Information & communication | 2017 |
| Gainer AS | Information & communication | 2021 |
| Galaxy Iris AS | Professional & scientific | 2022 |
| Galu Holding AS | | 2025 |
| Gameopedia AS | Information & communication | 2024 |
| Gamers Gathering AS | Wholesale & retail | 2024 |
| Garcon AS | Manufacturing | 2019 |
| Garcon Eiendom AS | Real estate | 2019 |
| Garcon Holding AS | Manufacturing | 2019 |
| Gardermoen B 1 AS | Real estate | 2024 |
| Gardermoveien 27 AS | Real estate | 2005 |
| Gardertoppen Utvikling AS | Real estate | 2017 |
| Garrison AS | | 2020 |
| Gastroklinikken Lillestrøm AS | Health & social care | 2026 |
| Gastroklinikken Lillestrøm Holding AS | | 2026 |
| Gastronomi AS | Hospitality | 2017 |
| Gasu Invest AS | Administrative & support | 2006 |
| Gclg Holding AS | | 2026 |
| Geir Siem AS | Health & social care | 2013 |
| General Logistics AS | Transport & logistics | 2026 |
| Geni AS | Professional & scientific | 1993 |
| Geodesic AS | Professional & scientific | 2026 |
| Geodis Norway AS | Transport & logistics | 1983 |
| Geodis Sweden AB Nuf | Transport & logistics | 2025 |
| Geogulv AS | Construction | 2020 |
| Geologisk AS | Professional & scientific | 2017 |
| German Car Club Norway AS | Administrative & support | 2023 |
| Getnoni Ans | Wholesale & retail | 2004 |
| Getro Capital AS | | 2023 |
| Ghost Collective AS | Professional & scientific | 2023 |
| Giafa Industrier AS | Agriculture & fishing | 2015 |
| Gitara Frisør AS | Other services | 2022 |
| Gjellebekkstubben 6 AS | Real estate | 2017 |
| Gjerde Eiendom AS | Real estate | 2002 |
| Gjerdrumsveien 171 AS | Real estate | 2018 |
| Gjerdune AS | Construction | 2021 |
| Gjess Vralter AS | Real estate | 2015 |
| Glen Dimplex Nordic AS | Wholesale & retail | 1992 |
| Glimto AS | Professional & scientific | 2026 |
| Global Dialogos AS | Education | 2020 |
| Global Internet Development Ltd | Administrative & support | 2015 |
| Globus Venture AS | Administrative & support | 2013 |
| Glommen Invest AS | Construction | 2005 |
| Glød Lillestrøm AS | Other services | 2014 |
| Gnisten Peis & Murservice AS | Construction | 2020 |
| Gnisten Peis & Piperehab AS | Construction | 2026 |
| GNT Invest AS | | 2026 |
| Gobo Norway AS | Wholesale & retail | 2024 |
| Goddessastir AS | Education | 2021 |
| Gode Dager AS | Administrative & support | 2021 |
| Gode Rom Interiørdesign AS | Professional & scientific | 2026 |
| Goj AS | Real estate | 2016 |
| Golf Media AS | Information & communication | 2024 |
| Good Shit AS | | 2020 |
| Gotaasalleen Boligutleie AS | Real estate | 2023 |
| Gotaasalleen Næring Bankbygget AS | Real estate | 2020 |
| GP & Co AS | Administrative & support | 2024 |
| Gral Design AS | Professional & scientific | 2024 |
| Grassy Holding AS | | 2025 |
| Green H2 Lillestrøm AS | Manufacturing | 2019 |
| Green Technology AS | Construction | 2010 |
| Greenscape AS | Administrative & support | 2024 |
| Grim Maskin Holding AS | Manufacturing | 2001 |
| Grim Maskin Service AS | Manufacturing | 2019 |
| Grimstad-Henninger Holding AS | Real estate | 2016 |
| Grinda Gård AS | Real estate | 2018 |
| Grorud Trading AS | Real estate | 1972 |
| Grow AS | Professional & scientific | 2016 |
| Grønlandsleiret Utvikling AS | Real estate | 2021 |
| Grønn Strøm Lillestrøm AS | Construction | 2024 |
| Grønnslottet /Graving & Anleggsgartnertjenster AS | Construction | 2021 |
| Grønt Maskin AS | Wholesale & retail | 1981 |
| Grønthallen AS | | 2025 |
| Gsfs Holding AS | | 2020 |
| Gu Holding AS | Wholesale & retail | 2005 |
| Gubr AS | | 2026 |
| Guerreiro Capital AS | | 2017 |
| Gullkopp Café AS | Hospitality | 2025 |
| Gusevik Holding AS | | 2026 |
| Gyrihaugen AS | Real estate | 2007 |
| Gystadmarka Parkering AS | Real estate | 2016 |
| H4 Holding AS | Professional & scientific | 2023 |
| Hag Gym AS | Arts & recreation | 2019 |
| Hagelia Invest AS | Real estate | 2005 |
| Hairbyraad AS | Other services | 2023 |
| Halden Kraftproduksjon AS | Energy | 2004 |
| Halix AS | Real estate | 2021 |
| Hama AS | Real estate | 1997 |
| Handelhub AS | Wholesale & retail | 2025 |
| Handl Norway AS | Wholesale & retail | 2018 |
| Haneborg Auto AS | Wholesale & retail | 2013 |
| Haneborgveien & Bergstigen AS | Real estate | 2023 |
| Hang IT on AS | Construction | 2017 |
| Hans Ludvigsen Holding AS | | 2019 |
| Hasal Holding AS | Hospitality | 2022 |