| Handelsbygg Skarnes AS | Real estate | 2016 |
| Handelsbygg Trøgstad AS | Real estate | 2011 |
| Handelsbygg Vik AS | Real estate | 2024 |
| Handelsbygg Årdal Nes AS | Real estate | 2013 |
| Hankø Bad AS | Real estate | 2003 |
| Hankø Fergeselskap AS | Transport & logistics | 2013 |
| Hankø Hotell & Spa AS | Hospitality | 2001 |
| Hankø Invest AS | Hospitality | 1977 |
| Hankø Kro AS | Real estate | 1977 |
| Hankø Marina AS | Arts & recreation | 2002 |
| Hankø Marina Bryggeplasser AS | Arts & recreation | 2007 |
| Hankø Utvikling AS | Real estate | 2003 |
| Hankøsund 1 AS | Transport & logistics | 2025 |
| Hankøsund Båthavn AS | Real estate | 2006 |
| Hankøsund Holding AS | Hospitality | 2014 |
| Hankøsund Restaurant AS | Hospitality | 2014 |
| Hankøsund Slip AS | Transport & logistics | 1992 |
| Hans Nielsen Hauge Institutt Ans | Professional & scientific | 2000 |
| Harco Vaktmestertjeneste AS | Administrative & support | 2014 |
| Hasseldokk AS | Professional & scientific | 2013 |
| Hav Kjølesystemer AS | Manufacturing | 2018 |
| Havnekroken Invest AS | | 2019 |
| Hawa Invest AS | Real estate | 2021 |
| HCB Eiendom AS | Real estate | 2010 |
| Heier Baardson AS | Professional & scientific | 2003 |
| Helleskilen Småbåthavn SA | Arts & recreation | 1965 |
| Helleskilen Vann- Og Avløpslag SA | Water & waste | 2010 |
| Helmin AS | Wholesale & retail | 2008 |
| Helmin Eiendom AS | Wholesale & retail | 2007 |
| Helmin Holding AS | Wholesale & retail | 2007 |
| Helmin MS AS | Wholesale & retail | 2007 |
| Helminsen AS | Administrative & support | 2013 |
| Helminsen Holding AS | Administrative & support | 2024 |
| Helsegaarden AS | Health & social care | 2023 |
| Helseklinikken Fredrikstad AS | Health & social care | 2016 |
| Henriksen Brendsel Holding AS | Wholesale & retail | 1974 |
| Henriksen Brenselforretning Og Varmesenter AS | Wholesale & retail | 2020 |
| Hermansen Entreprenør AS | Construction | 2022 |
| Herstad Invest AS | Other services | 2021 |
| HL Fix AS | Construction | 2023 |
| HMT Prosjekt AS | Professional & scientific | 2024 |
| Hoh Invest AS | Real estate | 2018 |
| Holene Holding AS | Professional & scientific | 2009 |
| Holme Bygg AS | Real estate | 2019 |
| Holst Holding AS | Real estate | 2004 |
| Horneks Ans | Information & communication | 2011 |
| HP Maskin Og Utleie AS | Wholesale & retail | 2025 |
| Humlekjær Archery AS | Wholesale & retail | 2011 |
| Hungry Trolls AS | Information & communication | 2024 |
| Hurdal Nærings- Og Handelspark AS | Real estate | 2018 |
| Husmannsplassen Eiendom AS | Real estate | 2020 |
| Huth AS | Construction | 2020 |
| Hvitkløver AS | | 2022 |
| Håkensen Service AS | Administrative & support | 2021 |
| Håvard Gondrosen Invest AS | | 2018 |
| Høkeli Holding AS | Real estate | 2015 |
| Ille Gode Greier AS | Real estate | 2019 |
| In the Wild Da | Information & communication | 2014 |
| Ina Fjellaksel Holding AS | | 2024 |
| Ingeniør Eirik Bilet AS | Wholesale & retail | 2025 |
| Ingeniør Evensen AS | Professional & scientific | 2023 |
| Input Data AS | Information & communication | 1998 |
| Input Quality Assistant AS | Information & communication | 2018 |
| Internasjonal Fagskole for Musikkinstrumentmakere AS | Education | 2023 |
| Invenio Corporate Finance AS | Professional & scientific | 2024 |
| Iworks AS | Manufacturing | 2012 |
| J Wessmann AS | Real estate | 1969 |
| J.T. Varehandel AS | Wholesale & retail | 2023 |
| J/R Holding AS | Financial services | 2017 |
| Jackon Holding AS | Manufacturing | 2005 |
| Jackon Skurup Eiendom AS | Real estate | 2008 |
| Jacmasol Holding AS | | 2020 |
| Jacobsen Invest AS | Information & communication | 2026 |
| Jaeger Auto AS | Wholesale & retail | 2023 |
| Jafs Gressvik 2 AS | Hospitality | 2026 |
| Jafs Gressvik AS | Hospitality | 2012 |
| Jaglass AS | Construction | 2017 |
| Jakobsli AS | Real estate | 2018 |
| Jan Petter Skåre AS | Construction | 2013 |
| Jarle Hatlelid AS | Real estate | 2006 |
| Jarw Eiendom AS | Real estate | 1997 |
| Jatosko Holding AS | | 2015 |
| JCB AS | Real estate | 2018 |
| Jejo Consulting AS | Professional & scientific | 2024 |
| Jeka Holding AS | Wholesale & retail | 2009 |
| JJT Eiendomsutvikling A/S | Real estate | 2019 |
| JMK Invest AS | Real estate | 2015 |
| JNG Lager Eiendom AS | Real estate | 2024 |
| JNG Montasje AS | Construction | 2020 |
| Jo/Jo Holding AS | Financial services | 2017 |
| Jobcoach Nuf | Education | 2016 |
| Jofi Ingeniørfirma AS | Professional & scientific | 1986 |
| Johansen Og Tollefsen Holding AS | Wholesale & retail | 2022 |
| Jokon Holding AS | Construction | 2012 |
| Jon E. Torp Transport AS | Transport & logistics | 2012 |
| Jonsson Bygg AS | Construction | 2022 |
| Jowa Bygg Og Eiendom AS | Professional & scientific | 2015 |
| JVM Holding AS | | 2021 |
| K246 Holding AS | | 2025 |
| Kalhagen AS | | 2012 |