| Hvete AS | | 2026 |
| Hviding Begravelsesbyrå AS | Other services | 1996 |
| Hviding Canning Co AS | Professional & scientific | 2013 |
| Hviding Eiendom AS | Other services | 1976 |
| HWG Holding AS | Information & communication | 2024 |
| HY2GEN Nordic AS | Professional & scientific | 2019 |
| Hydepoint AS | | 2022 |
| Hydraco AS | Wholesale & retail | 2018 |
| Hydrobatt AS | Professional & scientific | 2020 |
| Hygg Og Bygg AS | Construction | 2017 |
| Hygiea Consulting AS | Real estate | 2017 |
| Hygiea Støtteselskap AS | | 2026 |
| Hylica AS | Financial services | 2017 |
| Hypericum AS | Professional & scientific | 2005 |
| Hyrt AS | Administrative & support | 2025 |
| Hyrt Holding AS | Administrative & support | 2023 |
| Hytorc Norge AS | Wholesale & retail | 1999 |
| Hyttaa AS | Real estate | 2021 |
| Hyttaa Bygg AS | Construction | 2004 |
| Hytteved AS | Wholesale & retail | 2022 |
| Hywind AS | Administrative & support | 2010 |
| HZN Invest AS | Real estate | 2005 |
| Håkon Dagligvarer AS | Wholesale & retail | 2008 |
| Håland Byggtjenester AS | Construction | 2021 |
| Håland Invest Eiendom AS | Real estate | 2026 |
| Håland Invest Holdco AS | | 2026 |
| Håmsø Patentbyrå AS | Professional & scientific | 2017 |
| Håmsø Patentbyrå Holding AS | Administrative & support | 2022 |
| Håp AS | | 1999 |
| Håp Finans AS | | 2005 |
| Håp Og Drømmer AS | | 2020 |
| Håsera AS | Real estate | 2018 |
| Håvar Goa Foto AS | Professional & scientific | 2023 |
| Hæfa AS | Information & communication | 2017 |
| Höylytt AS | Arts & recreation | 2013 |
| Høger AS | Professional & scientific | 2026 |
| Høgsand Holding AS | | 2023 |
| Høiland Holding AS | Real estate | 2018 |
| Høiland Invest AS | Real estate | 2020 |
| Høiland Investering AS | Real estate | 2016 |
| Høines Skilt Stempel Etiketter AS | Manufacturing | 1998 |
| Højen Invest AS | | 2020 |
| Høleneset Vann Og Avløp Drift SA | Water & waste | 2020 |
| Høleneset Vann Og Avløp Utbygging SA | Water & waste | 2020 |
| Hørbart AS | Manufacturing | 2025 |
| Høybølgen AS | Real estate | 2005 |
| Høydepunkt Arrangementsservice AS | Administrative & support | 1989 |
| Høyer Investering AS | Health & social care | 2005 |
| Høyer Stadionparken AS | Wholesale & retail | 2013 |
| Høyere AS | | 2023 |
| Høyfjellshoteller.No AS | Administrative & support | 2026 |
| I Fjetland Holding AS | | 2021 |
| I Grinde AS | Financial services | 2005 |
| I Holding AS | | 2022 |
| I Jonassen Motorverksted AS | Other services | 1984 |
| I Le AS | | 2021 |
| I O S Offshore Holding AS | Administrative & support | 2007 |
| I-Planner AS | Professional & scientific | 2026 |
| I.Am.Mona AS | Health & social care | 2026 |
| I.Fossan AS | | 2024 |
| I.M. Cost Consultancy Limited | Professional & scientific | 2011 |
| I.M.S. Holding AS | Construction | 2024 |
| Iaa Ur & Gull Kilden AS | Wholesale & retail | 2023 |
| Iacta AS | | 2020 |
| Ib Stavanger AS | Real estate | 1988 |
| Ibkl Invest AS | Financial services | 2015 |
| Ibo Holding AS | Real estate | 1993 |
| Iboost AS | Professional & scientific | 2021 |
| Ibra Invest AS | Information & communication | 2017 |
| Iby Holding AS | | 2021 |
| Icds Recruitment Consultants Limited Nuf | Administrative & support | 2011 |
| Ice Communication Norge AS | | 2023 |
| Ice Norge AS | | 2023 |
| Ichange AS | Professional & scientific | 1994 |
| Ichips AS | Information & communication | 2007 |
| Icodeit AS | Education | 2023 |
| Icr Integrity Norge AS | Mining & quarrying | 2000 |
| Ida AS | Professional & scientific | 2026 |
| Idasofie AS | | 2019 |
| Idda Utvikling AS | Real estate | 2013 |
| Ideanova AS | Health & social care | 2013 |
| Ideation AS | Information & communication | 2017 |
| Idemia Denmark Nuf | Manufacturing | 2014 |
| IDENTITYROCK443 AS | Information & communication | 2024 |
| Identitystream AS | Information & communication | 2013 |
| Idland AS | | 2010 |
| Idova AS | Financial services | 2007 |
| Idrettens Hus Rogaland AS | Real estate | 2004 |
| Ids Invest AS | Professional & scientific | 2013 |
| Idsal Vest SA | Water & waste | 2015 |
| Idsøe Eiendom AS | Real estate | 2004 |
| Idun Holding AS | Energy | 2007 |
| Ifa Tech AS | Wholesale & retail | 2007 |
| Ifocus Øyeklinikk Stavanger AS | Health & social care | 2020 |
| Ifol AS | Real estate | 2015 |
| Igl Oil & Gas Consultants Ltd | Professional & scientific | 2005 |
| Iglaslaatten AS | Professional & scientific | 2005 |
| Igneous AS | Information & communication | 2020 |
| Ignited AS | Professional & scientific | 2026 |
| Igrid AS | Information & communication | 2026 |