| Has Investing AS | | 2023 |
| Hattebakken AS | Real estate | 2022 |
| Hawi Holding AS | | 2017 |
| Hazel Holding AS | | 2016 |
| HB Hansen Holding AS | Financial services | 2015 |
| Hedfri AS | | 2023 |
| Heffalomp Invest AS | | 2025 |
| Heistein AS | Health & social care | 2012 |
| Hejocama Holding AS | Financial services | 2017 |
| Helar Holding AS | Wholesale & retail | 2012 |
| Hellasol 13 Holding AS | | 2025 |
| Hellerud Gård Sameie Ans | Real estate | 1991 |
| Helm Consulting AS | Professional & scientific | 2022 |
| Helse Insight AS | Information & communication | 2026 |
| Hemano AS | Wholesale & retail | 2014 |
| Henmace Invest AS | | 2026 |
| Herde Konstruksjon Holding AS | | 2023 |
| Herlog AS | Professional & scientific | 2005 |
| Hetland Maskin AS | Wholesale & retail | 2002 |
| Hetvest AS | | 2023 |
| Hi-Value AS | | 2017 |
| Hik-Powerproducts AS | Manufacturing | 2020 |
| Himmeltitter AS | Professional & scientific | 2022 |
| Hjælp AS | Administrative & support | 2023 |
| HK Bull AS | Financial services | 2019 |
| HK Retail AS | Hospitality | 2021 |
| Hmsd AS | Financial services | 2018 |
| HNG AS | | 2021 |
| Holdberg AS | | 2012 |
| Holdenmann AS | | 2006 |
| Holt-Francati Consulting AS | Professional & scientific | 2021 |
| Holthe Invest AS | Financial services | 2005 |
| House of Solutions AS | Professional & scientific | 2013 |
| Hov Høydal AS | | 2021 |
| Howe Hall AS | Real estate | 2014 |
| Hsu Holding AS | Wholesale & retail | 2021 |
| Hsu Invest AS | Wholesale & retail | 2021 |
| Humlen Og Paus Data Da | Information & communication | 2025 |
| Humlestikk AS | Wholesale & retail | 2020 |
| Hundsnes Invest 2 AS | Professional & scientific | 2025 |
| Hundsnes Invest AS | | 2018 |
| Hvac Offshore AS | Mining & quarrying | 2012 |
| HWG AS | Health & social care | 2021 |
| Hæhre Consulting AS | Professional & scientific | 2025 |
| Høgda Invest AS | | 2023 |
| Høgg-Kam AS | | 2021 |
| Høiness Holding AS | | 1987 |
| Høvik VVS AS | Construction | 2007 |
| Ibma AS | Financial services | 2013 |
| Icaro AS | | 2021 |
| ID-OLS13 Holding AS | | 2023 |
| Ihr Holding AS | Financial services | 2015 |
| Ikigai Pursuits AS | Financial services | 2017 |
| Imago Holding AS | | 2021 |
| Imovest AS | Real estate | 2005 |
| Imsight AS | Professional & scientific | 2014 |
| Inbloom Investments AS | Financial services | 2011 |
| Inclino AS | Wholesale & retail | 2001 |
| Inflexion AS | Financial services | 2017 |
| Ingemundsen Invest AS | | 2024 |
| Ingrata AS | Information & communication | 2016 |
| Innendørs AS | Professional & scientific | 2019 |
| Inneox AS | Information & communication | 2013 |
| Intellix Investment AS | | 2023 |
| Inventure Kapital AS | | 2006 |
| Investina AS | Financial services | 2007 |
| Itbg AS | Professional & scientific | 2020 |
| Iwa AS | Real estate | 2016 |
| J Randulf Bull & Søn AS | Wholesale & retail | 1984 |
| Jager AS | Information & communication | 2005 |
| Jaka Forum AS | Financial services | 2009 |
| Jan Erik Brenne AS | Construction | 2014 |
| Jar Blomster AS | Wholesale & retail | 2023 |
| Jar Dyreklinikk AS | Professional & scientific | 2021 |
| Jar Eiendom BHG AS | Education | 2006 |
| Jar Entreprenør AS | Construction | 2010 |
| Jar Fus Barnehage AS | Education | 2018 |
| Jar Handel AS | Wholesale & retail | 2020 |
| Jar Helse AS | Health & social care | 1998 |
| Jar Hockey Shop AS | Wholesale & retail | 2018 |
| Jar Holding AS | Real estate | 2013 |
| Jar Isforum AS | Arts & recreation | 2008 |
| Jar Ishall AS | Real estate | 2007 |
| Jar Kapital AS | Information & communication | 2021 |
| Jar Rørteknikk AS | Construction | 2014 |
| Jarkollen AS | Real estate | 2005 |
| Jarkollen Eiendom AS | Real estate | 2024 |
| Jarmann AS | Professional & scientific | 2005 |
| Jat AS | Real estate | 2016 |
| Jens Christian Bang AS | Real estate | 2005 |
| Jep Invest AS | Financial services | 2010 |
| Jerrik AS | Financial services | 2015 |
| Jersey Invest AS | | 2021 |
| JFH Holding AS | | 2019 |
| Jib Holdings AS | | 2021 |
| JNM Invest AS | Financial services | 2015 |
| Joar Vellene AS | Financial services | 2014 |
| Joe AS | Professional & scientific | 2004 |
| John Galt AS | Real estate | 2013 |
| John Galt Eiendom AS | Real estate | 2021 |