| Haug Engineering Nuf | Professional & scientific | 2010 |
| Haug Gyn Holding AS | | 2026 |
| Haug Projects AS | Health & social care | 2018 |
| HB Blikk AS | Construction | 2014 |
| HB Gruppen AS | Real estate | 2014 |
| Hecksher Linjeagenturer AS | Transport & logistics | 2002 |
| Heede Holding AS | | 2024 |
| Hehe Invest AS | Administrative & support | 2022 |
| Heia 20 AS | Real estate | 2022 |
| Heia Laukas AS | Real estate | 2022 |
| Heie Datarådgivning AS | Information & communication | 2023 |
| Heimgard Cpe AS | Manufacturing | 2025 |
| Helfy AS | Education | 2019 |
| Helhetsterapi Lillestrøm AS | Health & social care | 2021 |
| Helmer Invest AS | Real estate | 2021 |
| Helmut AS | | 2026 |
| Helsebygget Legesenter Da | Health & social care | 2012 |
| Heltro Holding AS | Wholesale & retail | 2005 |
| Henrik Hold AS | | 2023 |
| Her-F Holding AS | | 2022 |
| Hersjø AS | | 2022 |
| Hesler Eiendom AS | Real estate | 2006 |
| HFR Trailer Norge AS | Administrative & support | 2020 |
| HG Import AS | Hospitality | 2011 |
| HHL Eiendom AS | Real estate | 2019 |
| Hilde's Frisørhjørne AS | Other services | 1996 |
| Hilton AS | Real estate | 2022 |
| Himlingspartner AS | Construction | 2014 |
| Hirkjølen Mat AS | Wholesale & retail | 2020 |
| Hjelmstad AS | Professional & scientific | 1995 |
| Hjelmstad Design AS | Information & communication | 2012 |
| Hjemmeautomasjon AS | Information & communication | 2023 |
| Hjortero AS | Real estate | 2014 |
| HK Ski AS | Hospitality | 2026 |
| HK Tea AS | Hospitality | 2026 |
| HKB Holding AS | | 2010 |
| HKW Eiendom AS | Real estate | 2015 |
| Hlundby Holding AS | | 2024 |
| HMF Eiendom AS | Real estate | 2017 |
| HMF Group AS | Transport & logistics | 2016 |
| Hoa Blomster AS | Wholesale & retail | 2021 |
| Hoelstad AS | Professional & scientific | 2024 |
| Hoff Eiendom AS | Manufacturing | 1996 |
| Hoff Snekkerverksted AS | Manufacturing | 1996 |
| Hoff-Holding AS | Manufacturing | 2005 |
| Hoftvedt AS | Professional & scientific | 2021 |
| Holding MFS AS | | 2025 |
| Holmsbu Bad Eiendom AS | Real estate | 2016 |
| Holst Eiendom AS | Real estate | 2022 |
| Holsten Invest AS | Financial services | 2006 |
| Holt & Ikon Ans | Construction | 2026 |
| Hope Asset Management AS | | 2023 |
| Horisont Parkering AS | Transport & logistics | 2026 |
| Hospitality Partner AS | Wholesale & retail | 2016 |
| Hotvet & Hoftvedtveien Veilag SA | Real estate | 2018 |
| House of Asia AS | Real estate | 2009 |
| Hunstad Næringseiendom AS | Real estate | 2018 |
| Hurdalsgata 81 AS | Real estate | 2023 |
| Hus & Hytteutvikling AS | Real estate | 2005 |
| Hus Bygg AS | Construction | 2013 |
| Huseby Vest Holding AS | | 2026 |
| Huser AS | Real estate | 2024 |
| Huser Consulting AS | Professional & scientific | 2024 |
| Huser Holding AS | Financial services | 2017 |
| Husland AS | Wholesale & retail | 2023 |
| Huus Eiendom AS | Real estate | 1998 |
| Huus Invest AS | Professional & scientific | 1998 |
| Hva Nå? AS | Education | 2023 |
| Hvaler Invest AS | | 2016 |
| Hvam Eiendom AS | Real estate | 1994 |
| Hvam Invest AS | Real estate | 2005 |
| Hvam MK AS | | 2025 |
| Hvamsvingen 7 AS | Real estate | 2009 |
| Hvamsvingen 8-16 AS | Real estate | 2022 |
| Hwhl AS | Financial services | 2016 |
| Hypersensation AS | | 2021 |
| Håndverker På Hjul AS | Wholesale & retail | 2024 |
| Håndverksgruppen Nytt Hjem AS | Construction | 2011 |
| Hårbørsen AS | Other services | 1991 |
| Hårseth Holding AS | Financial services | 2005 |
| Høilund Regnskap AS | Professional & scientific | 2011 |
| Høilund Revisjon AS | Professional & scientific | 2023 |
| Høvellast Lillestrøm AS | Wholesale & retail | 2015 |
| I@Eiendom AS | Real estate | 1965 |
| Iauto.No AS | Wholesale & retail | 2023 |
| Ifloors AS | Wholesale & retail | 2020 |
| Ikess Consulting AS | Education | 2019 |
| Ikon Norge Prosjekt AS | Professional & scientific | 2024 |
| Imarked AS | Wholesale & retail | 2024 |
| Impact Dynamics AS | Education | 2024 |
| Inciderm AS | Education | 2025 |
| Indeksforvaltning AS | Real estate | 2013 |
| Indi Spice Lillestrøm AS | Hospitality | 2018 |
| Indre Bolig AS | | 2021 |
| Indre Næringseiendom AS | Real estate | 2022 |
| Ine Foss Consulting AS | Professional & scientific | 2020 |
| Ing. Erik Hagen AS | Professional & scientific | 2014 |
| Ingdar AS | Professional & scientific | 2024 |
| Ingenix Consult AS | Professional & scientific | 2025 |
| Inger Hegna Holding AS | | 2005 |