| Gaveverket AS | Wholesale & retail | 2024 |
| Ge Eiendom AS | Real estate | 2014 |
| Georg Finsrud AS | | 2017 |
| Ginnungagap Invest AS | | 2023 |
| Gipsgjenvinning AS | Water & waste | 2019 |
| Gjerløw Eiendom AS | Real estate | 2009 |
| Gjøby Consulting AS | Professional & scientific | 2026 |
| GKR Holding AS | Financial services | 2005 |
| Glasshytta AS | Manufacturing | 1990 |
| Glindø Holding AS | Real estate | 2012 |
| Globe Import Engros A/S | Wholesale & retail | 2004 |
| Glombo Marina AS | Real estate | 2025 |
| Glomma Eiendomsutvikling AS | Real estate | 2002 |
| Glomma Elektriske AS | Construction | 2025 |
| Glomma Pall AS | Manufacturing | 1993 |
| Glommen Shipping AS | Transport & logistics | 2023 |
| Glycanova AS | Manufacturing | 2009 |
| GNP Eiendom AS | Manufacturing | 2011 |
| Graarud Eiendom AS | Real estate | 2020 |
| Graarud Spesialtransport AS | Transport & logistics | 1980 |
| Gran Forvaltning AS | | 2024 |
| Grandcrutours AS | Information & communication | 2023 |
| Grandcruvin AS | Administrative & support | 2018 |
| Granholmen Vann- Og Avløpslag SA | Water & waste | 2008 |
| Granli Skomakeri AS | Other services | 2020 |
| Grave Team AS | Construction | 2021 |
| Graveteam AS | Construction | 2025 |
| Green Column AS | Professional & scientific | 2020 |
| Green Spirit AS | Wholesale & retail | 2013 |
| Greenerway AS | Professional & scientific | 2023 |
| Gruffalo Holding AS | Professional & scientific | 2017 |
| Grundsteinen AS | Financial services | 2016 |
| Grønn Lotus Helse AS | Education | 2026 |
| GT Mur & Flis AS | Construction | 2014 |
| Gudevold Barnehage AS | Education | 2022 |
| Gullis Agentur AS | Wholesale & retail | 2012 |
| Gullungene Da | Manufacturing | 2013 |
| Guocheng AS | Administrative & support | 2022 |
| GW Installasjon AS | Construction | 2024 |
| H.P.H Holding AS | Real estate | 2017 |
| H.P.H Invest AS | Real estate | 2017 |
| Haakon Larsen AS | Manufacturing | 1968 |
| Haborn AS | Agriculture & fishing | 2021 |
| Haborn Eiendom AS | Wholesale & retail | 2025 |
| Habornveien 53A AS | Real estate | 2021 |
| Habornveien 60 AS | Real estate | 2022 |
| Haldenveien 6 AS | Real estate | 1989 |
| Hankøbygg AS | Real estate | 2012 |
| Hansen Eiendom AS | Real estate | 2001 |
| Hansen Og Widnes Eiendom Da | Real estate | 2005 |
| HANSEN1 AS | Construction | 2013 |
| Har Nok AS | | 2022 |
| Hartech Holding AS | Wholesale & retail | 2011 |
| Hasselgård Holding AS | | 2025 |
| Haugberg Konsulenttjenester Nuf | Administrative & support | 2015 |
| Haven Finans AS | Professional & scientific | 2017 |
| Havfolk Maritime AS | Other services | 2023 |
| Hazal Studios AS | Wholesale & retail | 2022 |
| Hazel Norge AS | Wholesale & retail | 2022 |
| HB Malerservice AS | Construction | 2014 |
| Hea Eiendomsutvikling AS | Real estate | 2019 |
| Hebu Invest AS | Real estate | 2025 |
| Hedg Invest AS | | 2022 |
| Heidenstrøm AS | Wholesale & retail | 1998 |
| Helt Konge AS | Hospitality | 2026 |
| Hendrik Fuglesang Holding AS | | 2023 |
| Henmar Eiendom AS | Real estate | 2021 |
| Henning Hesselberg Holding AS | Financial services | 2008 |
| Hepo Eiendom AS | Real estate | 2000 |
| Hermansen Enterprise AS | Financial services | 2017 |
| Hey Kiddo AS | Wholesale & retail | 2020 |
| Himmelblå Arkitekter AS | Professional & scientific | 2026 |
| HJ Aure Holding AS | | 2025 |
| Holding Me Tight AS | Real estate | 2005 |
| Holmenkvartalet AS | Real estate | 2018 |
| Holmsbrygga AS | Arts & recreation | 2026 |
| Hompetitten Transport AS | Transport & logistics | 2003 |
| House of Ikigai AS | Professional & scientific | 2020 |
| HPH Byggentreprenør AS | Construction | 2018 |
| HPH Utvikling AS | Real estate | 2021 |
| Hphei AS | Real estate | 2006 |
| HSV7 Holding AS | | 2026 |
| Hunderi Holding AS | Arts & recreation | 2010 |
| Hus & Eiendom AS | Professional & scientific | 1959 |
| Huskonsept AS | | 2026 |
| Hvaler Eiendom AS | Real estate | 1892 |
| Hvaler Marinepark AS | Real estate | 2022 |
| Hvaler Tomter AS | Real estate | 2021 |
| Hvidsten Utvikling AS | Real estate | 2018 |
| Hydrolift 2.0 AS | Wholesale & retail | 2025 |
| Hydrolift Pro AS | Wholesale & retail | 2025 |
| Hydrolift Pro Holding AS | Professional & scientific | 2025 |
| Hydrolift Property AS | Professional & scientific | 2025 |
| Hydrovolt AS | Water & waste | 2020 |
| Hyke AS | Wholesale & retail | 2013 |
| Hystad-Nilsen Råd & Bokføring AS | Professional & scientific | 2016 |
| Håkon Stensrud Erikstad AS | Wholesale & retail | 2008 |
| Idrop AS | Information & communication | 2016 |
| Illegal Design AS | Professional & scientific | 2024 |
| Indre Østfold Gjenvinning AS | Water & waste | 2005 |