| Helgeland Holding AS | Manufacturing | 2004 |
| Helgeland Hudlegekontor AS | Health & social care | 2015 |
| Helgeland Kjøkken AS | Wholesale & retail | 2022 |
| Helgeland Lås AS | Construction | 2024 |
| Helgeland Marinasystemer AS | Manufacturing | 2007 |
| Helgeland Marineservice AS | Manufacturing | 2017 |
| Helgeland Oljeservice AS | Transport & logistics | 2010 |
| Helgeland Plast AS | Manufacturing | 2004 |
| Helgeland Proffsenter AS | Other services | 2012 |
| Helgeland Retail AS | Wholesale & retail | 2016 |
| Helgeland Retail Eiendom AS | Real estate | 2016 |
| Helgeland Revisjon AS | Professional & scientific | 2019 |
| Helgeland Snekker Service AS | Construction | 2021 |
| Helgeland Takst AS | Real estate | 2015 |
| Helgeland Villmarksenter AS | Wholesale & retail | 2010 |
| Helgelandslam SA | Other services | 2020 |
| Helgelandsradioene AS | Information & communication | 2022 |
| Helma Hotelldrift AS | Hospitality | 2025 |
| Helma Hotelleiendom AS | Hospitality | 2011 |
| Helse & Sikkerhet SA | Health & social care | 1989 |
| Helsehuset Fysioterapi AS | Real estate | 1997 |
| Hemavan City AS | Real estate | 2012 |
| Hesa Eiendom AS | Real estate | 2012 |
| Hesa Holding AS | | 2021 |
| Hest I Rana AS | Education | 2021 |
| Hestvik Kalk Da | Manufacturing | 1997 |
| Heymat AS | Wholesale & retail | 2015 |
| HFH - Holding AS | Information & communication | 2009 |
| Hho - Gruppen AS | Real estate | 1998 |
| Hho Invest AS | Real estate | 2018 |
| Hholding AS | | 2020 |
| Hiata Holding AS | Real estate | 2021 |
| Hiller Eiendom AS | Real estate | 2017 |
| Hiller Holding AS | Real estate | 2012 |
| Hilton Holding AS | | 2021 |
| Hit IT AS | Arts & recreation | 2018 |
| HJH 1 AS | | 2026 |
| HJH 2 AS | | 2026 |
| HJH 3 AS | Administrative & support | 2026 |
| HJH Bolig AS | Real estate | 2024 |
| HJH Fjell Og Anleggsentreprenør AS | Construction | 2000 |
| HJH Holding AS | Administrative & support | 2011 |
| HK Eiendom AS | Real estate | 1974 |
| Hki AS | Manufacturing | 2007 |
| HM Tankanlegg AS | Wholesale & retail | 2026 |
| Hopaneng Holding AS | | 2026 |
| Hops AS | Education | 2015 |
| Hotell Ole Tobias AS | Hospitality | 1992 |
| House of Mindful Movement AS | Education | 2020 |
| Hovd Holding AS | Administrative & support | 2016 |
| Hovd Investing AS | | 2021 |
| Hovslagerveien 1 Og 3 AS | Real estate | 2024 |
| HP Produkter AS | Wholesale & retail | 2017 |
| HTH Mo I Rana AS | Wholesale & retail | 2021 |
| Huas Holding AS | | 2026 |
| Hucon AS | Information & communication | 2020 |
| Hudkilden AS | Health & social care | 2015 |
| Huka Holding AS | | 2024 |
| Hundholmen Eiendomsselskab AS | Real estate | 2017 |
| Husfliden AS | Wholesale & retail | 1961 |
| Hågensen Eiendom AS | Real estate | 2008 |
| Håpet - Kommunikasjon Og Veiledning AS | Professional & scientific | 2022 |
| Høgheia Eiendom AS | Real estate | 2010 |
| Høgheia Invest AS | Real estate | 2021 |
| Høglia Eiendom AS | Real estate | 2021 |
| Høglia Holding AS | Real estate | 2018 |
| Høglia Technologies AS | Information & communication | 2024 |
| Høgseth Eiendomsservice AS | Administrative & support | 2026 |
| Høgseth Holding Group AS | | 2026 |
| Høvleriveien 11 AS | Real estate | 2010 |
| Høvleriveien AS | Real estate | 2021 |
| Iao Holding AS | | 2022 |
| Ice Drift AS | Construction | 2008 |
| Ice Drift Eiendom AS | Real estate | 2013 |
| Ice Drift Holding AS | Construction | 2013 |
| Id Reklame AS | Professional & scientific | 2022 |
| Igym Express AS | Arts & recreation | 2021 |
| Ihip Helgeland AS | Hospitality | 2021 |
| Ihus Studio AS | Wholesale & retail | 2012 |
| Ikke A4 AS | Professional & scientific | 2015 |
| Ildgruben Bygg AS | Financial services | 2015 |
| Iliaden Eiendom AS | Real estate | 1996 |
| Imo Eiendom AS | Real estate | 2023 |
| Imo Holding AS | Manufacturing | 2008 |
| Imo Sveiseindustri AS | Manufacturing | 1990 |
| Imtas AS | Manufacturing | 2021 |
| Imtas Eiendom AS | Real estate | 2004 |
| Imtas Personell AS | Administrative & support | 2012 |
| Imtas Prosjekt AS | Manufacturing | 2004 |
| Ina Parelius AS | Health & social care | 2013 |
| Industrial Am AS | Professional & scientific | 2023 |
| Industrikvartalet AS | Real estate | 2025 |
| Industriprosjekt AS | Professional & scientific | 1989 |
| Industriveien Mo AS | Real estate | 2015 |
| Infrakon AS | Construction | 2020 |
| Infrakon Holding AS | | 2025 |
| Ingeniør Alf Arne Eide AS | Professional & scientific | 2009 |
| Ingeniør R. Skjømming AS | Professional & scientific | 2008 |
| Ingeniørgruppen AS | Professional & scientific | 2006 |
| Ink Flink AS | Other services | 2025 |