| Harald Eri AS | Information & communication | 2026 |
| Hawi Bygg AS | Construction | 2026 |
| Head Norway AS | Wholesale & retail | 2020 |
| Head Sport GmbH Nuf | Wholesale & retail | 2020 |
| Hecla Emissions Management AS | Professional & scientific | 2023 |
| Heffenings AS | Administrative & support | 2020 |
| Hegnasletta 1 AS | Real estate | 2005 |
| Heia Data AS | Information & communication | 2025 |
| Heimar AS | Other services | 2026 |
| Hellandshamn Eiendom AS | Hospitality | 2023 |
| Hellerudveien Eiendom AS | Real estate | 2000 |
| Hellvik Utvikling AS | Real estate | 2021 |
| Hellysat AS | | 2024 |
| Helse AS | | 2005 |
| Helsecoachen AS | Health & social care | 2020 |
| Henimayn AS | Wholesale & retail | 2013 |
| Henrichsen Holding AS | | 2020 |
| Hensel Holding AS | | 2022 |
| Hergu AS | Financial services | 2017 |
| Hertaas AS | Real estate | 2006 |
| Hex AS | Professional & scientific | 1986 |
| High North Horizon Group AS | Education | 2021 |
| Hipdriver AS | Information & communication | 2022 |
| Hitachi Vantara AS | Wholesale & retail | 1987 |
| Hjemmel Hamar AS | Real estate | 2002 |
| Hjemmesidehuset AS | Information & communication | 2023 |
| HKL Holding AS | Financial services | 2017 |
| HM New Business AS | Real estate | 2016 |
| HMB AS | Administrative & support | 2018 |
| HMS Norge AS | Health & social care | 2001 |
| Holdborg AS | Professional & scientific | 1987 |
| Holzweiler Holding AS | Manufacturing | 2014 |
| Holzweiler Items AS | Manufacturing | 2014 |
| Honeymooring AS | Professional & scientific | 2023 |
| Horisont & Co AS | Construction | 2016 |
| Horizon Design AS | Wholesale & retail | 2024 |
| House of Yachts AS | Wholesale & retail | 2017 |
| Hove Home Vest AS | Real estate | 2017 |
| Hovinveien 43 AS | Real estate | 1985 |
| Hoy Invest AS | | 2024 |
| HSV Bygg Holding AS | Real estate | 2012 |
| HSV Drift AS | Real estate | 2014 |
| Hult Investments AS | | 2023 |
| Humn AS | Professional & scientific | 2024 |
| Hundsnes Storfjell AS | Real estate | 2022 |
| Huskomhei AS | Professional & scientific | 2013 |
| Hydrateam AS | Professional & scientific | 2005 |
| Hydrateam Eiendom AS | Real estate | 2025 |
| Hyllenget Management AS | Real estate | 2010 |
| Hytteforlaget AS | Information & communication | 2012 |
| Hytteutvikling AS | Real estate | 2014 |
| Høvik Eiendom Holding AS | Real estate | 2008 |
| Høvik Vest Eiendom AS | Real estate | 2006 |
| Høvik Øst Eiendom AS | Real estate | 1989 |
| Høvik Øst Utvikling AS | Real estate | 2016 |
| Høviken AS | Real estate | 2010 |
| Høyvik Invest AS | Administrative & support | 1992 |
| I 11 Ski AS | Real estate | 2007 |
| Ibka Norge AS | Water & waste | 1989 |
| Icaro Holding AS | Professional & scientific | 2021 |
| Icp Asset Management AS | Financial services | 2023 |
| Icp Asset Management Holding AS | Financial services | 2023 |
| Icp Asset Management Partnership AS | Financial services | 2022 |
| Icp Partnership AS | Information & communication | 2021 |
| Iderma AS | Manufacturing | 2023 |
| Idq Norge Filial Av Idq A/S | Information & communication | 2015 |
| Idè Eiendom AS | Professional & scientific | 2008 |
| Ika Kongsberg Drift AS | Real estate | 2012 |
| Imagine Eiendom AS | Real estate | 2008 |
| Immunocorp Consumer Health AS | Wholesale & retail | 2000 |
| Implenia Civil Engineering GmbH Nuf | Construction | 2008 |
| Implenia Norge AS | Construction | 1998 |
| Ince Westergaard AS | Real estate | 2019 |
| Indigo Eiendom AS | Real estate | 2012 |
| Indigo Management AS | Transport & logistics | 2006 |
| Industriveien 18 AS | Real estate | 2006 |
| Industry Capital Partners AS | Financial services | 2022 |
| Industry Capital Partners Holding AS | Financial services | 2021 |
| Infact AS | Professional & scientific | 2012 |
| Infima AS | Professional & scientific | 2014 |
| Infima Holding AS | Financial services | 2014 |
| Infima Invest AS | Professional & scientific | 2020 |
| Infinigate AS | Wholesale & retail | 1996 |
| Infobric AS | Information & communication | 2011 |
| Infobric Time AS | Information & communication | 2002 |
| Infor (Norge) AS | Information & communication | 1981 |
| Infor International Norway Holdings AS | | 2025 |
| Information Technology Search AS | Administrative & support | 2011 |
| Infravent AS | Construction | 2012 |
| Infravent Holding AS | | 2025 |
| Ingeborg Jæger AS | Financial services | 2005 |
| Ingeniørfirmaet Pål Skomedal AS | Construction | 2001 |
| Inlumi AS | Information & communication | 2012 |
| Innlandsørret AS | | 2023 |
| Innmeldt AS | | 2013 |
| Innspurten 7 AS | Real estate | 2019 |
| Innvino AS | Wholesale & retail | 2013 |
| Inpex Idemitsu Norge AS | Mining & quarrying | 1989 |
| Intellectual Property Holdings AS | Information & communication | 2004 |
| Inter Cars Norge AS | Wholesale & retail | 2021 |