| Habbe Bygg AS | Construction | 2012 |
| Habité AS | Professional & scientific | 2026 |
| Hafslund Produksjon AS | Energy | 2004 |
| Hair Science AS | Education | 2021 |
| Handlepose AS | Financial services | 2021 |
| Hans Media AS | Information & communication | 2020 |
| Hansen IT Invest AS | | 2024 |
| Hansen Murservice AS | Construction | 2026 |
| Happy Driver AS | Transport & logistics | 2026 |
| Hardwoods AS | Professional & scientific | 2013 |
| Hasle AS | Manufacturing | 2025 |
| Haugen Eiendom AS | Wholesale & retail | 1973 |
| Haugomgaten 10 AS | Professional & scientific | 1987 |
| Haugomsenteret AS | Real estate | 2007 |
| Haugomsenteret Handel AS | Real estate | 2007 |
| Hav Og Ild AS | Hospitality | 2026 |
| Hbygg AS | Real estate | 2020 |
| Heggen Bygg AS | Real estate | 2014 |
| Helens Hud- Og Fotpleie AS | Other services | 2014 |
| Heller Eiendom AS | Real estate | 2023 |
| Heller Entreprenør AS | Construction | 1982 |
| Heller Holding AS | Construction | 2022 |
| Help Me Help You AS | Information & communication | 2019 |
| Helsekost & Hobby AS | Wholesale & retail | 1990 |
| Henli Holding AS | | 2023 |
| Het Invest AS | | 2018 |
| Hjem Med Ask AS | Real estate | 2025 |
| Hk-Eiendom AS | Administrative & support | 1981 |
| Hk-Holding AS | Manufacturing | 2024 |
| Hobbyhjørnet AS | Wholesale & retail | 2007 |
| Hobølveien 1 AS | Real estate | 2022 |
| Hoels Byggservice AS | Construction | 2013 |
| Hoff Gård Askim AS | Real estate | 2016 |
| Holding 77 AS | Education | 2017 |
| Holm Og Nilsen AS | Professional & scientific | 2007 |
| Holt Gård AS | Real estate | 2021 |
| Holtskogen 15 AS | Real estate | 2015 |
| Holtskogen 17 AS | Real estate | 2015 |
| Holzhalbinsel AS | Health & social care | 2025 |
| Hornseth Holding AS | | 2021 |
| Hovsveien Eiendom AS | Real estate | 2006 |
| HR Sørlie Skade & Lakk AS | Other services | 2020 |
| Hunstad Eiendom AS | Real estate | 2022 |
| Hunstad Holding AS | Real estate | 2005 |
| Hurtig Transport AS | Transport & logistics | 2016 |
| Hus Og Hagemiljø AS | Wholesale & retail | 2023 |
| Hvinden-Haug AS | Real estate | 2005 |
| Håndverk Og Bygg AS | Real estate | 2024 |
| Håndverksspesialisten AS | Administrative & support | 2004 |
| Hødal AS | Administrative & support | 1999 |
| Høitomt AS | Real estate | 1998 |
| Høitomt Auto AS | Wholesale & retail | 2023 |
| Høitomt Invest AS | Wholesale & retail | 2023 |
| Høyendal AS | Other services | 2012 |
| Høyendal Bilservice Ans | Other services | 2002 |
| I a M AS | Construction | 2020 |
| Ideum Da | Professional & scientific | 2007 |
| Ihlen Eiendom AS | | 2015 |
| Ikp Group Da | Administrative & support | 2009 |
| Iman Gastro AS | Wholesale & retail | 2025 |
| Iman Takeaway AS | Hospitality | 2025 |
| Imea Eiendom AS | Real estate | 2019 |
| Imperium AS | Arts & recreation | 2019 |
| Indre Østfold Eiendom AS | Real estate | 2021 |
| Indre Østfold Eiendomsmegling AS | Professional & scientific | 2020 |
| Indre Østfold Golfsenter AS | Arts & recreation | 2021 |
| Indre Østfold Hjertesenter AS | Health & social care | 2019 |
| Indre Østfold Maskin AS | Construction | 2019 |
| Indre Østfold Næringsutvikling AS | Professional & scientific | 2017 |
| Indre Østfold Ventilasjon AS | Construction | 1993 |
| Indre Østfold VVS AS | Construction | 2012 |
| Ingstad Invest AS | Professional & scientific | 2019 |
| Ingstad Media AS | Professional & scientific | 2023 |
| Innemiljø Og Varme AS | Wholesale & retail | 2002 |
| Innkjøpsportalen Da | Wholesale & retail | 2009 |
| Inovatic Ans | Administrative & support | 2011 |
| Instapartner Event AS | Hospitality | 2017 |
| Integrado AS | Agriculture & fishing | 2015 |
| Interiørarkitekt Hilde Zezanski AS | Professional & scientific | 2017 |
| Intersport Askim AS | Wholesale & retail | 2023 |
| Invati AS | Wholesale & retail | 2007 |
| Invest 06 AS | | 2023 |
| Invest 54 AS | Construction | 2015 |
| Investeringa AS | Real estate | 2021 |
| Invictus Treningssenter AS | Arts & recreation | 2015 |
| Iø Utvikling AS | | 2022 |
| J-L Eiendom AS | Real estate | 2026 |
| J.C. Transportservice AS | Transport & logistics | 2013 |
| Jacel Invest AS | Real estate | 2007 |
| Jakovic Holding AS | Hospitality | 2021 |
| Jernbane Grill AS | Hospitality | 2025 |
| Jernveien 3 AS | Real estate | 2007 |
| JK M AS | Construction | 2021 |
| Jobber I Norge AS | Administrative & support | 2022 |
| Johansen Invest AS | | 2025 |
| Johnny Lyng Holding AS | | 2020 |
| JR Holding Askim AS | Wholesale & retail | 2012 |
| July Tea Askim AS | Hospitality | 2024 |
| Juniortrans AS | Transport & logistics | 2014 |
| Jørgen Edkvist Service AB | Construction | 2011 |