| Hawk Eiendom AS | Real estate | 1986 |
| Heddaks Invest AS | Real estate | 2005 |
| Helge Magnus Opsahl Holding AS | | 2025 |
| Helix Invest AS | Professional & scientific | 2023 |
| Helle Røren Invest AS | Real estate | 1994 |
| Hemm AS | | 2023 |
| Herland Lyd Og Lys AS | Arts & recreation | 2022 |
| Hernes Transportforretning AS | Transport & logistics | 2010 |
| Heïm Productions AS | Information & communication | 2024 |
| Hiefn Holding AS | Real estate | 2017 |
| Hiefn Re AS | Real estate | 2017 |
| Himalaya Park AS | Arts & recreation | 1995 |
| Hjelleset Group AS | | 2019 |
| Hjerte for Hest AS | Agriculture & fishing | 2019 |
| Hoa Invest AS | | 2022 |
| Holjo Invest AS | Real estate | 1991 |
| Holoana Holding AS | | 2025 |
| Holt Eiendom AS | Real estate | 1989 |
| Homerun Invest AS | | 2020 |
| Horvei Kommunikasjon AS | Professional & scientific | 2014 |
| Hosle Holding AS | Real estate | 2017 |
| Hosle Legekontor AS | Health & social care | 2012 |
| Hovdens Invest AS | | 2026 |
| Hovnic AS | | 2007 |
| HTT Fornybar AS | | 2018 |
| Husmorplassen Ans | Wholesale & retail | 1992 |
| Hægeland Halvorsen Holding AS | Financial services | 2011 |
| Høiaas Sulheim AS | | 2018 |
| Ibg Holding AS | Financial services | 2005 |
| Ibmu AS | | 2026 |
| Ida Fredrikke Invest AS | | 2026 |
| Idrettsminner AS | Wholesale & retail | 2026 |
| Iiconsulting AS | Professional & scientific | 2026 |
| Ikas Invest AS | Financial services | 2017 |
| Incremental AS | Professional & scientific | 2023 |
| Innovatrykk AS | Manufacturing | 2023 |
| Investiv AS | Real estate | 1981 |
| Investor Eiendom AS | Real estate | 2016 |
| Investor Holding AS | Real estate | 2014 |
| Investorius AS | Real estate | 2014 |
| Isolar AS | | 2021 |
| Issimo Holding AS | | 2019 |
| Ivento AS | Financial services | 2005 |
| Jani AS | Real estate | 1987 |
| Jasmine Eiendom AS | Real estate | 2024 |
| JKJ Holding AS | | 2005 |
| JM Graveservice AS | Construction | 2014 |
| Jobbinnsikt AS | Administrative & support | 2012 |
| Jojeko AS | Professional & scientific | 2018 |
| Jordnært Bærum AS | Transport & logistics | 2021 |
| Joy Design Ltd Nuf | Professional & scientific | 2007 |
| JPL Invest AS | | 2021 |
| Jse Consulting AS | Professional & scientific | 2017 |
| Jørtik AS | Real estate | 2007 |
| Kajo Invest AS | Real estate | 2019 |
| Kalk Invest AS | Real estate | 2012 |
| Kampkompis AS | Health & social care | 2025 |
| Kan Frisør Blindern AS | Other services | 2019 |
| Kan Holding AS | Real estate | 1994 |
| Kan Products AS | Professional & scientific | 2022 |
| Kanden Konsult AS | Professional & scientific | 1985 |
| Kawal AS | | 2020 |
| Kaze Invest AS | Financial services | 2011 |
| Keiper AS | Information & communication | 2022 |
| Kilsund AS | Real estate | 1989 |
| Kirenna AS | | 2024 |
| Kirennah AS | | 2024 |
| Klakegg Investments AS | | 2025 |
| Klamer Holding AS | Education | 2017 |
| Klingsholm Holding AS | Professional & scientific | 2010 |
| Knut Qvale AS | Wholesale & retail | 1973 |
| Kontraktor AS | Construction | 2010 |
| Korsegården Invest AS | Real estate | 2014 |
| Kralin & Co AS | Wholesale & retail | 1971 |
| Kring Invest AS | Financial services | 2018 |
| Krogh Styling Concept AS | Wholesale & retail | 2017 |
| Kroka AS | | 2025 |
| Krokofanten AS | Real estate | 2016 |
| Kul Podcast AS | Information & communication | 2024 |
| Laburnum AS | Real estate | 2011 |
| Lachmus AS | Arts & recreation | 2026 |
| Lafa AS | | 2023 |
| Langeland Handelseiendom AS | Real estate | 2020 |
| Lasa Holding AS | Real estate | 2019 |
| Lay Down Your Arms | Administrative & support | 2025 |
| Lein Finans AS | | 2026 |
| Lemon Equity AS | | 2021 |
| Levo Invest AS | Financial services | 2015 |
| León Bianca AS | Wholesale & retail | 2025 |
| Lifestyle Focus AS | Administrative & support | 2007 |
| Lincoln AS | | 2021 |
| Lindman Advokatfirma AS | Professional & scientific | 2019 |
| Liora AS | | 2025 |
| Little Green Harvest AS | Administrative & support | 2023 |
| Lively Holding AS | Wholesale & retail | 2017 |
| Loeo AS | | 2026 |
| Logna AS | Real estate | 2011 |
| Ltks AS | Wholesale & retail | 2022 |
| Lv-F Invest AS | Real estate | 2005 |
| Lynx Unlimited AS | Financial services | 1993 |