| Harding Trading Holding AS | Real estate | 2016 |
| Hasseldalen AS | Real estate | 1985 |
| Hasseldalen Brygge AS | Real estate | 2011 |
| Haugebo Invest AS | Real estate | 2018 |
| Haugeto AS | Information & communication | 2023 |
| Haugeto Holding AS | Real estate | 2021 |
| Haven Holding AS | Professional & scientific | 2016 |
| Havstad Og Dalholt Vannverk SA | Water & waste | 2022 |
| Havsø Stonkonomics Invest AS | | 2021 |
| Heg Kapital AS | Real estate | 2025 |
| Heia Bygg AS | Construction | 2026 |
| Helen Evjenth Design Limited Nuf | Professional & scientific | 2013 |
| Helge Berntsen AS | Wholesale & retail | 1994 |
| Helleland Maskinservice AS | Administrative & support | 2021 |
| Helles Gull & Sølv AS | Wholesale & retail | 2012 |
| Helseblikk AS | Health & social care | 2022 |
| Helseblikk Bedrift AS | Health & social care | 2024 |
| Helseblikk Hud AS | Health & social care | 2023 |
| Helsebutikken I Grimstad AS | Wholesale & retail | 1993 |
| Hemera AS | Administrative & support | 2017 |
| Henrik Heia Holding AS | | 2026 |
| Henrik Ibsensgate 12 AS | Real estate | 1991 |
| Herald Maritime Services PVT Ltd | | 1995 |
| Herla AS | | 2009 |
| Herlighed Grimstad AS | Hospitality | 2022 |
| Herlighed Odden AS | Hospitality | 2026 |
| Herwa Eiendom AS | Real estate | 2005 |
| Hesnes Gartneri Da | Agriculture & fishing | 2007 |
| Hesnes Kjøkken AS | Manufacturing | 2011 |
| Hesneslandet AS | Professional & scientific | 2014 |
| Hestehagen Eiendomsutvikling AS | Real estate | 2018 |
| Hestetorvet Vask & Rens AS | Other services | 2018 |
| Hestinvest AS | Arts & recreation | 2024 |
| Highpower AS | | 2024 |
| Himle Begravelsesbyrå AS | Other services | 2023 |
| Hinlo Holding AS | Professional & scientific | 2020 |
| His Boligutvikling AS | Real estate | 2025 |
| His Brygge AS | Real estate | 2019 |
| His Solåsen AS | Real estate | 2020 |
| HJT Holding AS | | 2024 |
| HK Hus AS | Construction | 2009 |
| HKS Instituttet AS | Education | 2012 |
| HL Bygg AS | Construction | 2018 |
| HL Eiendom AS | | 2013 |
| HL Gutta AS | | 2026 |
| Hodne Consulting AS | Professional & scientific | 2021 |
| Hoel Ønh AS | Health & social care | 2026 |
| Hokarob AS | Professional & scientific | 2019 |
| Hokland Invest AS | Financial services | 2015 |
| Hokus Pokus Grimstad AS | Education | 2022 |
| Holdyourhorses AS | | 2019 |
| Holgernes AS | | 2026 |
| Holla AS | Professional & scientific | 2022 |
| Holsthuset Ans | Real estate | 2016 |
| Holvika Mat AS | Wholesale & retail | 2011 |
| Home Hotel Grimstad AS | Hospitality | 2023 |
| Hommedalen Holding AS | | 2026 |
| Hoppin AS | Wholesale & retail | 2015 |
| Hoppin AS | Wholesale & retail | 2026 |
| Hos Oss Grimstad AS | Hospitality | 2023 |
| Hovdegrend Bolig AS | Real estate | 2014 |
| Hovdegrend Fritid Og Næring AS | Real estate | 2014 |
| Hovdehytta AS | Real estate | 1999 |
| Hovden Flyutleie AS | Administrative & support | 2013 |
| Hoyland & Co. Holding AS | | 2025 |
| Husflidstua AS | Wholesale & retail | 1995 |
| HVF AS | | 2025 |
| Hwpo Holding AS | Construction | 2022 |
| Hydmel AS | Professional & scientific | 2025 |
| Hydrokleen AS | Construction | 2014 |
| Hyrte AS | Construction | 2026 |
| Hyrte Holding AS | | 2026 |
| Hytta Drift Grimstad AS | Hospitality | 2024 |
| Hytta Pizzeria Og Kebab AS | Hospitality | 2019 |
| Håkallen Holding AS | Real estate | 2000 |
| Håland Bygg AS | Construction | 2006 |
| Hørsdal Invest AS | Financial services | 2007 |
| Hørte Gård Catering AS | Hospitality | 2006 |
| Hørte Invest AS | Real estate | 2009 |
| Høybåtangen Utvikling AS | Real estate | 2014 |
| Ibsen Fotostudio Da | Professional & scientific | 2011 |
| Ibsen Holding AS | Real estate | 2014 |
| Icab Invest AS | | 2006 |
| Ideal Holding AS | Construction | 2021 |
| Idealbygg AS | Construction | 2021 |
| Idvas Eiendom AS | Wholesale & retail | 2013 |
| Iflowhealth AS | Information & communication | 2026 |
| Igland & Nyhaven Slam Og Rørspyling AS | Water & waste | 2017 |
| Igland AS | Real estate | 2009 |
| Igland Bad AS | Construction | 2015 |
| Igland Bergemoveien 41 AS | Real estate | 2021 |
| Igland Bergemoveien 42 AS | Real estate | 2017 |
| Igland Bergemoveien 45 AS | Real estate | 2009 |
| Igland Bergemoveien 47 AS | Real estate | 2009 |
| Igland Bygg AS | Construction | 2011 |
| Igland Dør & Vindu AS | Wholesale & retail | 2008 |
| Igland Eiendom AS | Real estate | 1993 |
| Igland Garasjen AS | Manufacturing | 1994 |
| Igland Reddalsveien AS | Real estate | 2009 |
| Igland Smith Petersens Gate AS | Real estate | 2023 |