| Hbø Holding AS | Financial services | 2005 |
| HDL Holding AS | | 2025 |
| Hebel AS | Real estate | 2005 |
| Hedda Og Farfar AS | | 2022 |
| Hegnar Hotell AS | Hospitality | 1987 |
| Hel Forvaltning AS | Real estate | 2025 |
| Helmax Invest AS | | 2019 |
| Help Holding AS | Real estate | 2020 |
| Helpfunder AS | Information & communication | 2023 |
| Helsehjørnet AS | Health & social care | 2014 |
| Henem Management AS | Financial services | 2015 |
| Henor AS | Wholesale & retail | 1999 |
| Henrik Reiling Holding AS | Real estate | 2016 |
| Henso Consult AS | Professional & scientific | 2022 |
| Herlung AS | | 2018 |
| Hesselroth & Øyehaug AS | Real estate | 2012 |
| Hife AS | | 2021 |
| Hillevågen Holding AS | Wholesale & retail | 2005 |
| Hint Interiørarkitekter AS | Professional & scientific | 2017 |
| Hjemmespa Ans | Wholesale & retail | 2014 |
| Hjo Invest AS | Administrative & support | 2002 |
| Hjpd Nesbru AS | Wholesale & retail | 2024 |
| HN Development AS | Real estate | 2020 |
| Holmen Bilpleie AS | Other services | 2021 |
| Holmen Blomst AS | Wholesale & retail | 1991 |
| Holmen Brygge Motor AS | Wholesale & retail | 2009 |
| Holmen Ishall Drift AS | Arts & recreation | 1989 |
| Holmen Marine AS | Wholesale & retail | 2004 |
| Holmen Sko Og Christiania Frisør AS | Wholesale & retail | 1999 |
| Holmen Slipp AS | Arts & recreation | 1994 |
| Holmen Slipp Holding AS | Arts & recreation | 2018 |
| Holmen Slippen Drift AS | Real estate | 2026 |
| Holmen Tannklinikk AS | Health & social care | 2022 |
| Holmen Yachtværft Drift AS | Real estate | 2025 |
| Holmengata 28 AS | Real estate | 2012 |
| Holmengaten 24 AS | Real estate | 2010 |
| Holmenhavna Holding AS | | 2018 |
| Holmenlegene AS | Health & social care | 2007 |
| Home & Cottage AS | Wholesale & retail | 2008 |
| Hovinmoen AS | Real estate | 2018 |
| Hstad AS | | 2023 |
| Hundebarnehagen AS | Agriculture & fishing | 2014 |
| Hunt Invest AS | Real estate | 2018 |
| Husfix AS | Construction | 2000 |
| Hvalstad Invest AS | Real estate | 1997 |
| Hvalstrand Eiendom AS | Real estate | 2016 |
| Hvammern Invest AS | | 2020 |
| Hwcm AS | | 2024 |
| Håheim Prosjektutvikling AS | Professional & scientific | 1998 |
| Håheims Eiendomsselskap AS | Real estate | 1981 |
| Hæhre Invest AS | Real estate | 2011 |
| Høi-Bo AS | Real estate | 2022 |
| Høie AS | Manufacturing | 2005 |
| Høie Investering AS | Real estate | 2018 |
| Høie Utvikling AS | Real estate | 2018 |
| Høk AS | Real estate | 2016 |
| Id Finans AS | | 2026 |
| Idmo Invest AS | | 2022 |
| Iee AS | Professional & scientific | 2018 |
| Ilamme AS | Information & communication | 2020 |
| Ing AS | Information & communication | 2021 |
| Ing Westad AS | Wholesale & retail | 1971 |
| Ing. Rybergsgt. 56 AS | Real estate | 2005 |
| Ingen Begrensninger AS | Professional & scientific | 2008 |
| Ingeniør H B Holmsen & Co Ans | | 1976 |
| Iselin Holding AS | | 2020 |
| Iselin Invest AS | Information & communication | 2025 |
| Isicom AS | Wholesale & retail | 2019 |
| Jabuticaba Invest AS | | 2026 |
| Jappsi Invest AS | | 2020 |
| Jarotech AS | Wholesale & retail | 2005 |
| Jarotech Eiendom AS | Real estate | 1984 |
| Jarotech Holding AS | Financial services | 2005 |
| Jenny Og Farfar AS | | 2020 |
| Jensen Import Og Eksport AS | | 2026 |
| Jetsetter Holding AS | | 2021 |
| JM Leker AS | Wholesale & retail | 2025 |
| Jocojacobs AS | Financial services | 2016 |
| Johan Follestads Vei 12 AS | Real estate | 2015 |
| Johan Follestads Vei 15 AS | Real estate | 2013 |
| JP No Limit AS | Professional & scientific | 2013 |
| JR Capital AS | | 2023 |
| JRC Invest AS | Professional & scientific | 2004 |
| JSV AS | Real estate | 2013 |
| Jørbæk AS | Wholesale & retail | 1997 |
| Kaare Berntsen AS | Wholesale & retail | 1963 |
| Kaihatzu AS | | 2021 |
| Kamrath AS | Administrative & support | 2005 |
| Kams Invest AS | Real estate | 2011 |
| Kari Dolve AS | | 2025 |
| Karoline Holding AS | Real estate | 2019 |
| Kavli Invest AS | Financial services | 2017 |
| KB Kunstinvest AS | Wholesale & retail | 2011 |
| Kenta Holding AS | Real estate | 2017 |
| Kiropraktorkameratene AS | Health & social care | 2020 |
| Kiropraktorkompaniet AS | Health & social care | 2017 |
| Klerck Sæthre Utvikling AS | | 2006 |
| Klinker AS | Real estate | 2011 |
| Klopp Utleie AS | Hospitality | 2025 |
| Knatten J&P AS | Financial services | 2016 |