| Haca Invest AS | Real estate | 2008 |
| Hacan Trading AS | | 2026 |
| Hacapar AS | | 2021 |
| Hace AS | | 1997 |
| Hacha AS | Financial services | 2007 |
| Hack AS | | 2018 |
| Hackmamba AS | Information & communication | 2023 |
| Hacks and Workarounds AS | | 2022 |
| Hacvo Invest AS | | 2023 |
| Had Invest AS | | 2025 |
| Haddeland Regulatory Consulting AS | Professional & scientific | 2017 |
| Hadean Blue Capital I AS | Financial services | 2025 |
| Hadean Capital I AS | Financial services | 2017 |
| Hadean Capital II AS | Financial services | 2020 |
| Hadean F2 Investco AS | | 2020 |
| Hadean Growth Fund I AS | Financial services | 2024 |
| Hadean Ventures AS | Financial services | 2017 |
| Hadeland Beredskapssenter Invest AS | Real estate | 2020 |
| Hadelandsparken 8 AS | Real estate | 2022 |
| Hades Capital AS | Real estate | 2005 |
| Hadi Holding AS | | 2014 |
| Hadi Mat AS | Hospitality | 2026 |
| Hadoc AS | Health & social care | 2016 |
| Hadria AS | Professional & scientific | 2007 |
| Hadrian Eiendom AS | Real estate | 1996 |
| Haeg AS | Professional & scientific | 2015 |
| Haeiendom Holding AS | Real estate | 2017 |
| Haematopus AS | | 2025 |
| Haerverk Holding AS | | 2019 |
| Hafa Invest AS | | 2019 |
| Hafeez Gård AS | Agriculture & fishing | 2025 |
| Hafeld Invest AS | | 2021 |
| Haffeld Drift AS | Health & social care | 2026 |
| Haffeld Holding AS | | 2026 |
| Hafgufa Invest AS | Real estate | 2016 |
| Hafi Fremtid Nuf | | 2008 |
| Hafjell Alpinlandsby Pluss AS | Real estate | 2017 |
| Hafjell Front AS | Real estate | 2023 |
| Hafjell Helse- Og Handelsbygg AS | Real estate | 2016 |
| Hafjell Lodge AS | Real estate | 2012 |
| Hafjell Lodge Noir AS | Real estate | 2025 |
| Hafn Holding AS | Real estate | 2015 |
| Hafnor Investment AS | Information & communication | 2017 |
| Hafnor/Erichsen SA | Arts & recreation | 2020 |
| Hafo Consulting AS | Education | 2013 |
| Haforo Holding AS | Real estate | 2017 |
| Hafr Holding AS | | 2022 |
| Hafri AS | Real estate | 2018 |
| Hafrsfjord Terrasse AS | Real estate | 1933 |
| Hafslund AS | Energy | 2018 |
| Hafslund Celsio AS | Energy | 1997 |
| Hafslund Invest AS | Professional & scientific | 2019 |
| Hafslund Kraft AS | Energy | 1996 |
| Hafslund Mobil Energi AS | Administrative & support | 2022 |
| Hafslund Produksjon Holding AS | Energy | 1898 |
| Hafslund Sarpfoss Holding AS | Energy | 2025 |
| Hafslund Vekst AS | Professional & scientific | 2017 |
| Hafslund Vind AS | Energy | 2026 |
| Hafstad AS | | 2021 |
| Haft AS | Real estate | 2013 |
| Hafver Holding AS | | 2019 |
| Haga & Berg AS | Construction | 1997 |
| Haga & Berg Entreprenør AS | Construction | 1998 |
| Haga & Berg Service AS | Construction | 2014 |
| Haga Consulting AS | Professional & scientific | 2025 |
| Haga Investments AS | Professional & scientific | 2011 |
| Haga Management Consulting AS | Professional & scientific | 2015 |
| Haga Næringspark AS | Real estate | 2015 |
| Haga Rock&Roll AS | | 2022 |
| Haga VVS AS | Construction | 2026 |
| Hagafoss Eiendom AS | Real estate | 2012 |
| Hagal AS | Professional & scientific | 2018 |
| Hagal Battery AS | Professional & scientific | 2021 |
| Hagal Technology AS | Professional & scientific | 2011 |
| Hagalisletto AS | Financial services | 2015 |
| Hagaløkka Eiendom AS | Real estate | 1999 |
| Hagaløkkveien 13 Eiendom AS | Real estate | 2022 |
| Hagaløkkveien 26 AS | Real estate | 2013 |
| Hagaløkkveien 28 AS | Real estate | 2007 |
| Hagamulen AS | Real estate | 2008 |
| Hagan Eiendom AS | Real estate | 2005 |
| Hagan Næringseiendom AS | Real estate | 2006 |
| Hagasand Holding AS | | 2022 |
| Hagaseth Consult AS | Professional & scientific | 2017 |
| Hagasol AS | Professional & scientific | 2008 |
| Hagatun AS | Other services | 2023 |
| Hagatunet Invest AS | Real estate | 2022 |
| Hagavegen 2 Ingeberg AS | Real estate | 2011 |
| Hagbarth Schjøtt AS | Real estate | 2008 |
| Hagberg Larsen Invest AS | Wholesale & retail | 2022 |
| Hagebakken Kapital AS | | 2022 |
| Hageby Eiendomsmegling AS | Real estate | 2025 |
| Hagebyen AS | Real estate | 2020 |
| Hagebyen Dam AS | Professional & scientific | 2023 |
| Hagebyendoc AS | Professional & scientific | 2016 |
| Hagebyinvest AS | | 2023 |
| Hagebyveien 27 AS | Real estate | 2005 |
| Hageco AS | Wholesale & retail | 2004 |
| Hagefeen AS | Administrative & support | 2020 |
| Hageform AS | Administrative & support | 2019 |