| Helsego AS | Health & social care | 2019 |
| Hems AS | | 2018 |
| Henriksen Holding & Capital Invest AS | | 2026 |
| Herland Consulting AS | Professional & scientific | 2008 |
| Hero Investering AS | | 2026 |
| Hestnes Velforening | Other services | 1991 |
| Hetland Investering AS | Real estate | 2010 |
| HHB Holding AS | | 2020 |
| Hhus Invest AS | Financial services | 2006 |
| Hibba Holding AS | | 2020 |
| Hippo Holding AS | Financial services | 2005 |
| Hjelmax AS | Real estate | 2013 |
| Hjernestammen AS | Health & social care | 2023 |
| HLB Invest AS | Professional & scientific | 2011 |
| HMS Koordinatoren AS | Health & social care | 2011 |
| HN Produksjoner AS | | 2026 |
| Hode Skulder Kne & Tå AS | Health & social care | 2022 |
| Hognestad Consulting AS | Professional & scientific | 2018 |
| Holdinvest AS | Real estate | 2008 |
| Holmgard AS | Professional & scientific | 2026 |
| Holtet Takst AS | Real estate | 2023 |
| Holtet Takst Avd. Buskerud AS | Real estate | 2025 |
| Homegame AS | Information & communication | 2023 |
| Hooo Holding AS | | 2024 |
| Hopalong 06 AS | Real estate | 2005 |
| Hovland Consult AS | Professional & scientific | 2006 |
| HRD Invest AS | Professional & scientific | 2019 |
| HST Data Center Advisory AS | | 2021 |
| HTB AS | Professional & scientific | 2024 |
| Hubroo AS | Professional & scientific | 2014 |
| Hult AS | | 2022 |
| Humanoid.Guide AS | Information & communication | 2025 |
| Huxley Mayfair AS | | 2024 |
| Hvi Holding AS | Information & communication | 2016 |
| Hviz AS | Construction | 2020 |
| Hydle Invest AS | | 2018 |
| Hygge Tannhelse AS | Health & social care | 2021 |
| Hykk AS | | 2022 |
| Håkon Nyland AS | Real estate | 1990 |
| Håland Konsulent-Tjenester AS | Transport & logistics | 2016 |
| Hårek Invest AS | Real estate | 1990 |
| Icco AS | Financial services | 2005 |
| Id Høie Holding AS | Information & communication | 2021 |
| Id Høie Media AS | Information & communication | 2021 |
| Ilios Holding AS | Financial services | 2005 |
| Impo AS | Professional & scientific | 2013 |
| Import Og Konsulenttjenester AS | Professional & scientific | 2023 |
| Impunitas AS | Health & social care | 2010 |
| Inet AS | Information & communication | 1995 |
| Infrasmart AS | Information & communication | 2020 |
| Ingema Holding AS | Real estate | 2015 |
| Ingeniør M. Mæland AS | Professional & scientific | 2002 |
| Inger Lise Lindland Holding AS | Financial services | 2013 |
| Ingvarda Invest AS | Financial services | 2013 |
| Innovation & Change Management AS | Professional & scientific | 2022 |
| Innsats AS | | 2023 |
| Innspill HC AS | Professional & scientific | 2008 |
| Interiør Harmoni AS | Professional & scientific | 2022 |
| Intermundia Ltd Nuf | Professional & scientific | 2006 |
| Internasjonal Service AS | | 2022 |
| Invest Ok AS | Financial services | 2006 |
| Invest Roald Sunde AS | Financial services | 2005 |
| Investico AS | Real estate | 2008 |
| Ipf Invest AS | Professional & scientific | 2012 |
| Ipf Services AS | Professional & scientific | 2013 |
| Irene Ekeland Holding AS | | 2026 |
| Is Paradiset AS | Hospitality | 2020 |
| Isd Consulting AS | Professional & scientific | 2020 |
| Isolde AS | Real estate | 1990 |
| Isolde SPV 2 AS | | 2023 |
| Isy Living AS | Hospitality | 2017 |
| Itil AS | Financial services | 2008 |
| Iussisti AS | Administrative & support | 2023 |
| Iussisti Invest AS | Administrative & support | 2023 |
| Ivko AS | Real estate | 2013 |
| Ivon Frisør & Parykk AS | Other services | 2025 |
| J T Teknologi AS | Professional & scientific | 2021 |
| J&E Myklebust Invest Ans | | 2017 |
| J.D. Trading AS | Financial services | 2011 |
| Ja-Va Holding AS | | 2025 |
| Jabl Holding AS | Professional & scientific | 2018 |
| Jaccs Invest AS | | 2026 |
| Jadre AS | | 2026 |
| Jan Bjerga AS | Financial services | 2005 |
| Jebb AS | Financial services | 2018 |
| Jeib AS | Professional & scientific | 2020 |
| Jelsa Holding AS | Other services | 2018 |
| Jelsa Investering AS | Other services | 2018 |
| Jemso AS | Wholesale & retail | 1982 |
| Jiffy Records Ans | Arts & recreation | 2003 |
| JK Engineering AS | Professional & scientific | 2018 |
| JM Pedersen Holding AS | | 2024 |
| JML Tech AS | | 2021 |
| Joakim Schrøder Holding AS | | 2026 |
| Job Invest AS | Professional & scientific | 2019 |
| Johab AS | Professional & scientific | 2021 |
| Jokaa Holding AS | | 2023 |
| Jomaniph Investering AS | Financial services | 2008 |
| Jomil Services AS | Professional & scientific | 2016 |
| Jonassen Capital AS | | 2021 |