| Gmta Digital Marketing AS | | 2012 |
| Go to Eleven AS | Professional & scientific | 2019 |
| Godthaabklinikken AS | Health & social care | 2012 |
| Gog Invest AS | Real estate | 2005 |
| Goldstars AS | Information & communication | 2024 |
| Golfbygg AS | Real estate | 1995 |
| Golfpoint Solutions AS | Wholesale & retail | 2023 |
| Granbakken Eiendom AS | Real estate | 2005 |
| Granrud & Benoit AS | | 2025 |
| GRC Advisory Services AS | Professional & scientific | 2019 |
| Green Growth AS | Professional & scientific | 2013 |
| Greenblue AS | Professional & scientific | 2023 |
| Grepp Invest AS | Real estate | 1998 |
| Grindvold Eiendom AS | Real estate | 2013 |
| Grini Bygg AS | Construction | 2001 |
| Grotmol Solutions AS | Information & communication | 2008 |
| Grundt Kapital AS | | 2022 |
| Guh Holding AS | Financial services | 2021 |
| Gullgruven AS | Wholesale & retail | 2022 |
| Gullhammer AS | Construction | 2022 |
| Gunnar Til Tjeneste AS | Administrative & support | 2020 |
| Gurney AS | Real estate | 2022 |
| Gynekologene På Bekkestua AS | Health & social care | 2012 |
| H Hunstadbråten Holding AS | | 2025 |
| H M Flood Aksjeselskap | Wholesale & retail | 1936 |
| H Selmer AS | Hospitality | 2009 |
| H2 Management AS | Real estate | 2005 |
| Haaken Holding AS | | 2026 |
| Hac AS | | 2021 |
| Haddouche F&B AS | Hospitality | 2025 |
| Haga Golf AS | Real estate | 1999 |
| Hah 1914 AS | Real estate | 2016 |
| Hamre Holding AS | Real estate | 2005 |
| Haneng Holding AS | | 2023 |
| Hans Olberg & Co AS | Financial services | 1887 |
| Hansa Holding AS | | 2026 |
| Hansen Consulting Services AS | Real estate | 2010 |
| Hansine AS | Real estate | 2018 |
| Haos Invest AS | | 2022 |
| Hardstyle Dna AS | Administrative & support | 2024 |
| Harpun Eiendom AS | Financial services | 2006 |
| Harto Regnskapsrådgivning Nuf | Professional & scientific | 2004 |
| Harto RR Holding AS | Real estate | 2017 |
| Haslum Eiendom AS | Real estate | 2017 |
| Hawk AS | Information & communication | 2016 |
| He and She Frisør AS | Other services | 2005 |
| He Investering AS | | 2021 |
| Hea Holding AS | | 2021 |
| Head Candy AS | Arts & recreation | 2017 |
| Healy Engeenering AS | Professional & scientific | 2006 |
| Heca Ans | Wholesale & retail | 1999 |
| Hedmar & Mellum Consulting Ans | Professional & scientific | 2006 |
| Hefros Invest AS | | 2017 |
| Hehani AS | Education | 2022 |
| Heidenhammer AS | | 2023 |
| Hejja Invest AS | | 2020 |
| Helge Bjertnæs Consulting AS | Professional & scientific | 2008 |
| Helge Breistein AS | Arts & recreation | 2026 |
| Helseveiledning AS | Health & social care | 2022 |
| Helsingeng Invest AS | | 2024 |
| Hemako AS | Professional & scientific | 2024 |
| Henrik Jørgensen Invest AS | Financial services | 2017 |
| Hesel AS | | 2018 |
| Hestan AS | Real estate | 2007 |
| HHV12 AS | | 2018 |
| Hil Eiendom AS | Real estate | 2008 |
| Hildonen-Ramstad AS | | 2025 |
| Hlpr AS | Information & communication | 2022 |
| Hne Invest AS | | 2023 |
| Homeostasis AS | Health & social care | 2023 |
| Honerud Consulting AS | | 2019 |
| Hosle Invest AS | Real estate | 2016 |
| Hosle VVS AS | Construction | 2025 |
| House of Mind AS | Wholesale & retail | 2008 |
| Hovde Markedsanalyse AS | Professional & scientific | 2026 |
| HSH Invest Og Eiendom AS | Real estate | 2018 |
| Hudmed AS | Health & social care | 2003 |
| Hugin Och Munin AS | Professional & scientific | 2019 |
| Human Consulting AS | Professional & scientific | 2016 |
| Human Invest AS | Professional & scientific | 2018 |
| Humanpotential AS | Professional & scientific | 2016 |
| Hunan Restaurant AS | Hospitality | 2022 |
| Hurd AS | Professional & scientific | 2013 |
| Hydria AS | Professional & scientific | 2023 |
| Håve Assuranse AS | Financial services | 1995 |
| Høgforsgst AS | Wholesale & retail | 2018 |
| Høit-Invest AS | | 2019 |
| I Kommunikasjon AS | Professional & scientific | 2013 |
| Ibsen Reiser AS | Administrative & support | 2009 |
| Ids A/S | Wholesale & retail | 1988 |
| Ikarus AS | Financial services | 2018 |
| Ikon AS | Real estate | 1990 |
| Illusion Holding AS | | 2024 |
| Ilmi Holding AS | | 2020 |
| Imac Norway AS | Administrative & support | 1998 |
| Immense Dynamic AS | Professional & scientific | 2017 |
| Impavidus AS | Real estate | 2012 |
| IN2GROUP AS | Information & communication | 2000 |
| Indirekte AS | Professional & scientific | 2026 |
| Industri Bygning Og Hjem Instrumentering AS | Professional & scientific | 2013 |