| Haute Rocks AS | Manufacturing | 2025 |
| Havlø Holding AS | Real estate | 2019 |
| Hawaii Fritid Og Hytta Da | Professional & scientific | 2000 |
| Hay Consulting AS | | 2025 |
| HD Soundlab AS | Information & communication | 2010 |
| Headcoach AS | Education | 2019 |
| Hedvin AS | Wholesale & retail | 2024 |
| Hegdehaugsveien 3 Holding AS | Real estate | 2024 |
| Hegdehaugsveien 3 Næring AS | Real estate | 2024 |
| Heikampen AS | Information & communication | 2024 |
| Hele Horvens Hei Da | Professional & scientific | 2000 |
| Helgno Kroner Da | Professional & scientific | 2000 |
| Helhetsbalanse AS | Health & social care | 2019 |
| Helimed AS | Health & social care | 1995 |
| Helland-Evebø Consulting AS | Professional & scientific | 2020 |
| Helmas AS | | 2019 |
| Helseth Hem Invest AS | | 2023 |
| Helsinki Ja Hudprodukter Da | Professional & scientific | 2000 |
| Heltne Invest AS | Financial services | 2018 |
| Hemeso AS | | 2024 |
| Hemeso Invest AS | | 2025 |
| Hemir AS | Financial services | 2007 |
| Herakleitos AS | | 2018 |
| Hervest AS | | 2021 |
| Hervig Invest AS | | 2022 |
| Hessa Holding AS | Financial services | 2004 |
| HFC Capital AS | Real estate | 2018 |
| Highcamp AS | | 2021 |
| Hillestad Prosjekt AS | Professional & scientific | 2016 |
| Himmelfall AS | | 2020 |
| Himmelfall II AS | | 2021 |
| HN Renhold AS | Administrative & support | 2012 |
| Ho in Oh AS | Real estate | 2019 |
| Hobbesland Invest AS | | 2019 |
| Hoino Sprit Og Dun Da | Professional & scientific | 2000 |
| Holberg Research AS | Professional & scientific | 2005 |
| Holmenkollen Emisjon Da | Professional & scientific | 2000 |
| Holmenkollen Turn Cup Da | Professional & scientific | 2000 |
| Holsviks Da | Real estate | 1992 |
| Holtekilen Båthavn AS | Administrative & support | 1915 |
| Holtet 45 AS | Real estate | 2007 |
| Holtet 45 Holding AS | Real estate | 2020 |
| Holtskog AS | Education | 2014 |
| Homa Invest AS | | 1992 |
| Hop Sing Holding AS | | 2021 |
| Horoskopno Da | Information & communication | 1999 |
| House of Hennie AS | Professional & scientific | 2021 |
| HTB Invest AS | Real estate | 2019 |
| Hub Bibliotek Da | Professional & scientific | 2000 |
| Hud & Briller Butikken Da | Information & communication | 2000 |
| Huk Worldcup Da | Professional & scientific | 2000 |
| Hundred Percent AS | | 2021 |
| Hus Og Almanakk Da | Professional & scientific | 2000 |
| Huset Stabekk AS | Real estate | 1959 |
| Hvalstad Forretningsbygg AS | Real estate | 2005 |
| Håland Joy Da | Professional & scientific | 2000 |
| Håsand AS | Financial services | 2012 |
| Håvi Eiendom AS | Real estate | 2011 |
| Høyskolen for Ledelse Og Teologi AS | Education | 2009 |
| Ib Holding AS | Professional & scientific | 2005 |
| Ibev Invest AS | | 2026 |
| Ics Software AS | Information & communication | 2025 |
| Identi AS | Wholesale & retail | 1989 |
| Ili Elektro Service AS | Construction | 2010 |
| Ili Holding AS | Construction | 2013 |
| Imperativ IT Da | Professional & scientific | 2000 |
| Improving Lives AS | Information & communication | 2017 |
| Improving Lives Drift AS | Information & communication | 2022 |
| Inca Consulting AS | Information & communication | 2007 |
| Inca Holding AS | Professional & scientific | 1995 |
| Incase Systems AS | Construction | 2025 |
| Infono Basar Da | Professional & scientific | 2000 |
| Ingeniør Jørgen Wille AS | Professional & scientific | 2006 |
| Ingriducation Holding AS | Information & communication | 2020 |
| Innovatech Kapital AS | | 2025 |
| Instant Memory AS | Professional & scientific | 2023 |
| Intendia Group Norge AS | Education | 1999 |
| Intendia Holding AS | Education | 2006 |
| Interforum AS | Real estate | 2025 |
| Internett Partner AS | Information & communication | 1995 |
| Investeringsselskapet Rolf Borge AS | Financial services | 2005 |
| Investments AS | | 2021 |
| Investord AS | | 2018 |
| Invictum AS | Financial services | 2005 |
| Italia Privat Eye Da | Information & communication | 2000 |
| Imagic Films AS | Information & communication | 1988 |
| J E Stangebye AS | Real estate | 1924 |
| J. Rustad Holding AS | | 2024 |
| Jabot Renseri Da | Professional & scientific | 2000 |
| Jabra Invest AS | Real estate | 2005 |
| Jaeger Consulting AS | Professional & scientific | 2007 |
| Jaeger Invest AS | Financial services | 2011 |
| Jale Bolig AS | Real estate | 2022 |
| Jan Og Pupper Da | Professional & scientific | 2000 |
| Jan-Georg Hoffmann Invest AS | Real estate | 1998 |
| Jaost 249 Holding AS | | 2023 |
| Jar Invest AS | | 2020 |
| Jar-Tek Rør AS | Construction | 1986 |
| Jarksen AS | Administrative & support | 2022 |
| Jaske Bygg AS | Construction | 2022 |