| Guericke Engineering AS | Professional & scientific | 2016 |
| Gundersen Anestesi Service Ans | Health & social care | 2006 |
| Gundersfix AS | Administrative & support | 2025 |
| Gurød Eiendomsservice AS | Administrative & support | 2025 |
| Gurød Invest AS | Financial services | 2005 |
| Gutta Eiendom AS | Construction | 2014 |
| Gutta Holding AS | Construction | 2013 |
| H. Nielsen Invest AS | | 2023 |
| H.M Holding AS | | 2025 |
| Haca Holding AS | Financial services | 2005 |
| Haiku AS | Information & communication | 2024 |
| Hans Investment AS | | 2026 |
| Happychild AS | Wholesale & retail | 2024 |
| Harabanar Holding AS | Health & social care | 2022 |
| Hegg Holding AS | Financial services | 2005 |
| Heiberg Industries AS | Real estate | 2016 |
| Heisel Holding AS | Real estate | 2018 |
| Helle Bjørnstad Holding AS | | 2020 |
| Hellingsrud Holding AS | | 2019 |
| Hemino Holding AS | Administrative & support | 2019 |
| Henrik Solvang Holding AS | Financial services | 2018 |
| Henriksens Bygg AS | Construction | 2023 |
| Heppinn AS | Real estate | 2015 |
| Herholdt Holding AS | Financial services | 2005 |
| Herr Og Fru AS | Hospitality | 2011 |
| Herr Og Fru Eiendom AS | Real estate | 2024 |
| Herstad Holding AS | | 2021 |
| Hertel Helse AS | Health & social care | 2014 |
| Hesby Kompetanse AS | Education | 2024 |
| Hesnes Gine Inc. | | 1997 |
| Heyerdahl Holding AS | Professional & scientific | 2005 |
| HGG 4 AS | Real estate | 2019 |
| HGL Invest AS | Wholesale & retail | 2021 |
| Highperformance Boats AS | Manufacturing | 2014 |
| Hilbertrommet AS | | 2026 |
| Hin Nordic AS | Professional & scientific | 2026 |
| Hjemmeside AS | Information & communication | 2022 |
| HJF Invest AS | | 2021 |
| Hjort Conveyor AS | Wholesale & retail | 1991 |
| Hjorth Arkitekter AS. | Professional & scientific | 2021 |
| Hoff Finans AS | | 2026 |
| Holmelin Consult AS | Professional & scientific | 2015 |
| Holtekjæråsen AS | | 2005 |
| Hoppdrift AS | Administrative & support | 2011 |
| Hovland Group AS | | 2019 |
| Hovland Wivestad AS | Financial services | 2017 |
| Hpro Invest AS | Information & communication | 2020 |
| HR Tech AS | Professional & scientific | 2018 |
| Hrabnar Eiendom AS | Real estate | 2022 |
| Hud- Og Helseskolen AS | Education | 2024 |
| Huiveien Invest AS | Real estate | 2019 |
| Husvik Harbour AS | Transport & logistics | 2008 |
| Hvaal Hjørnevik Holding AS | | 2024 |
| Hvaløy Bygg AS | Construction | 2025 |
| Hyams 10 AS | Real estate | 2004 |
| Hyams 13 AS | Real estate | 2004 |
| Hyams 15 AS | Real estate | 2007 |
| Hyams 17 AS | Real estate | 2007 |
| Hyams 21 AS | Real estate | 2007 |
| Hyams 22 AS | Real estate | 2007 |
| Hyams 5 AS | Real estate | 2004 |
| Hyams 6 AS | Real estate | 2004 |
| Hyams 7 AS | Real estate | 2004 |
| Hyams 8 AS | Real estate | 2004 |
| Hytta Group AS | Information & communication | 2022 |
| Håndverk Senteret AS | Real estate | 1983 |
| Høan Eiendomsutvikling AS | Real estate | 1997 |
| Høgefjell AS | Real estate | 2020 |
| Hølen Holding AS | Professional & scientific | 2018 |
| Høneberget AS | Real estate | 2017 |
| Ibalanse Naturmedisinske AS | Health & social care | 2020 |
| Ibhan AS | Hospitality | 2022 |
| Ida Bakken AS | Real estate | 2020 |
| Ide & Interiør AS | Wholesale & retail | 2008 |
| Ignit AS | Wholesale & retail | 2026 |
| Ihlebæk Holding AS | | 2024 |
| Ilumi AS | Professional & scientific | 2018 |
| Industrial Automation Nordic AS | Information & communication | 2015 |
| Ingatun AS | Other services | 2022 |
| Ingeniørfirmaet G M Jacobsen AS | | 1998 |
| Ingrid Harsem AS | Health & social care | 2014 |
| Ingska AS | Arts & recreation | 2024 |
| Inmark AS | Wholesale & retail | 1976 |
| Insperia AS | Professional & scientific | 2004 |
| Intentional Design AS | Professional & scientific | 2019 |
| Interiør Tønsberg AS | Wholesale & retail | 2025 |
| Intermerchant AS | Real estate | 2017 |
| Intra Økonomi AS | Professional & scientific | 2004 |
| Iris Capital AS | Financial services | 2013 |
| Isak & Isak Holding AS | Construction | 2017 |
| Item Grace Design AS | Professional & scientific | 2026 |
| Its NG 102 AS | Real estate | 2017 |
| J. J. Multiservice AS | Administrative & support | 2020 |
| Jan Cato Invest AS | | 2021 |
| Jan Tore Jahre AS | Professional & scientific | 1988 |
| Jantor AS | Professional & scientific | 1998 |
| Jarn AS | Information & communication | 2023 |
| Jerzy Was | Construction | 2005 |
| JGJ Holding AS | | 2026 |
| Jholding AS | | 2018 |