| Hasund Holding AS | Financial services | 2011 |
| Hasund Invest AS | Financial services | 2005 |
| Hasund Mek. Verksted AS | Manufacturing | 1947 |
| Hatida AS | Real estate | 2008 |
| Hatløy & Utgård Fiskeri AS | Agriculture & fishing | 2021 |
| Hatløy Brygga Ans | Hospitality | 2018 |
| Hatløy Catering AS | Hospitality | 1987 |
| Hatløy Eiendomsrådgivning AS | Real estate | 2009 |
| Hatløy Havna Ans | Real estate | 2018 |
| Hatløy Holding AS | Real estate | 2003 |
| Hatløy Maritime AS | Wholesale & retail | 1998 |
| Hatløy Molo Ans | Real estate | 2018 |
| Hauge Eiendom Da | Real estate | 1999 |
| Havblikk Optikk AS | Wholesale & retail | 2004 |
| Havstad Eiendom 2 AS | Real estate | 2026 |
| Havstad Eiendom AS | Real estate | 2005 |
| Havåg Bygg AS | Construction | 1995 |
| Heikampen 555 AS | | 2019 |
| Heim-Yoga AS | Arts & recreation | 2026 |
| Hellebraut Ans | Real estate | 2024 |
| Hellebøen AS | Real estate | 1996 |
| Henna Invest AS | | 2021 |
| HH Capital AS | Wholesale & retail | 2008 |
| HHT AS | Real estate | 2020 |
| Hibahs AS | Real estate | 2017 |
| Hit Import Ans | Wholesale & retail | 1998 |
| Hofseth Eigedom AS | Real estate | 2000 |
| Hofseth Invest AS | Wholesale & retail | 1999 |
| Hofseth Sport AS | Wholesale & retail | 1985 |
| Holsekerdalen AS | Real estate | 2009 |
| Holssletta 2 AS | Real estate | 2002 |
| Hotel Ulstein AS | Hospitality | 2006 |
| Hovden Holding AS | Agriculture & fishing | 2005 |
| Hovden Klubbhus AS | Real estate | 1996 |
| Hovden Senior AS | Agriculture & fishing | 1995 |
| Huk Invest AS | Financial services | 1998 |
| Hurrahølet Butikkeiendom AS | Real estate | 2007 |
| Hyperthermics AS | Professional & scientific | 2013 |
| Hyperthermics Protein AS | Professional & scientific | 2024 |
| Håndlykken Kaul Web Development Da | Information & communication | 2023 |
| Hårstova AS | Other services | 2003 |
| Hødd Turnhall AS | Arts & recreation | 2021 |
| Høddvollbarnehagen SA | Education | 1992 |
| I. Nesset Transport AS | Construction | 2007 |
| I2BE Holding AS | | 2024 |
| Ilm Invest AS | Professional & scientific | 2006 |
| Indirect Pro AS | Professional & scientific | 2026 |
| Industri Design Offshore Management AS | Professional & scientific | 2019 |
| Infra Handel AS | Wholesale & retail | 1994 |
| Infratag AS | Professional & scientific | 2021 |
| Inge Kaldhol AS | Financial services | 2005 |
| Inger M Kristensen AS | Financial services | 1997 |
| Inkster Holding AS | Professional & scientific | 2024 |
| Inkster Marine AS | Professional & scientific | 2018 |
| Innimylla AS | Information & communication | 2021 |
| Inservio AS | Professional & scientific | 2013 |
| Invincere AS | | 2019 |
| Io Ulsteinvik AS | Mining & quarrying | 2016 |
| Island Defender AS | Transport & logistics | 2019 |
| Island Diligence AS | Transport & logistics | 2018 |
| Island Discoverer AS | Transport & logistics | 2020 |
| Island Drilling Company AS | Mining & quarrying | 2017 |
| Island Drilling Crewing AS | Mining & quarrying | 2018 |
| Island Evolution AS | Transport & logistics | 2025 |
| Island Explorer AS | Transport & logistics | 2022 |
| Island Ocean AS | Transport & logistics | 2021 |
| Island Offshore Crewing AS | Mining & quarrying | 2010 |
| Island Offshore III AS | Real estate | 2026 |
| Island Offshore III KS | Mining & quarrying | 2000 |
| Island Offshore International Shipping AS | Transport & logistics | 2014 |
| Island Offshore Invest AS | Transport & logistics | 2007 |
| Island Offshore Management AS | Mining & quarrying | 2002 |
| Island Offshore Shipholding LP | Transport & logistics | 2006 |
| Island Offshore Shipping AS | Transport & logistics | 2001 |
| Island Offshore V AS | Transport & logistics | 2001 |
| Island Offshore Viii AS | Transport & logistics | 2004 |
| Island Offshore Viii KS | Transport & logistics | 2004 |
| Island Offshore X AS | Transport & logistics | 2004 |
| Island Offshore X KS | Transport & logistics | 2004 |
| Island Offshore Xi AS | Mining & quarrying | 2005 |
| Island Offshore Xii AS | Transport & logistics | 2005 |
| Island Offshore Xii Ship AS | Transport & logistics | 2009 |
| Island Victory AS | Transport & logistics | 2018 |
| Ivaland Småbåtlag SA | Transport & logistics | 1995 |
| Izoton Norge AS | Manufacturing | 2018 |
| Izoton Norge Nuf | Manufacturing | 2013 |
| Jahsen Eiendom AS | Real estate | 2006 |
| Jaktpreik AS | Information & communication | 2023 |
| JOB2SEA Crewing Aps Nuf | Administrative & support | 2022 |
| Johama AS | Administrative & support | 2005 |
| John Gjerde AS | Manufacturing | 1982 |
| John Kleven AS | Real estate | 2021 |
| Joke AS | | 2021 |
| Jonny Mork AS | Wholesale & retail | 2006 |
| Jonny Mork Holding AS | Wholesale & retail | 1997 |
| JR Holding Ulsteinvik AS | | 2025 |
| JR Ulsteinvik AS | Hospitality | 2024 |
| Jupiter Invest II AS | Financial services | 2015 |
| Jupiter Invest Junior AS | Financial services | 2015 |
| Kaffebaren Ulsteinvik AS | Hospitality | 2005 |