| HC Consult AS | Administrative & support | 2017 |
| HC Gravco AS | Construction | 2020 |
| HC Intbio AS | Information & communication | 2016 |
| HC Paleet AS | Wholesale & retail | 2025 |
| HC Properties AS | Real estate | 2022 |
| HC Systems AS | Information & communication | 2010 |
| HC Timing AS | Professional & scientific | 2017 |
| Hca Melbye AS | Wholesale & retail | 1960 |
| Hca Melbye Holding AS | Real estate | 1988 |
| HCAP1 AS | Real estate | 2025 |
| HCAP2 AS | Real estate | 2025 |
| Hcconsulting AS | Administrative & support | 2025 |
| HCD Gamlebyen AS | Other services | 2018 |
| HCD Holding AS | Other services | 2023 |
| HCD Teaterplassen AS | Other services | 2018 |
| Hce Invest AS | Financial services | 2016 |
| HCG85 Holding AS | Financial services | 2010 |
| HCH Eiendom AS | Real estate | 2016 |
| HCH Finans AS | Real estate | 2022 |
| HCH Kapital AS | Real estate | 2020 |
| Hci AS | Real estate | 2022 |
| Hci Management AS | | 2023 |
| Hcj-Holding AS | | 2021 |
| HCL AS | Health & social care | 2018 |
| HCL Technologies Norway AS | Information & communication | 2010 |
| Hclien Invest AS | | 2023 |
| HCM Capital AS | | 2025 |
| HCM Invest AS | Real estate | 2016 |
| HCN Capital AS | | 2024 |
| Hcu Holding AS | | 2022 |
| HD Arkitekter AS | Professional & scientific | 1997 |
| HD Eiendom AS | Real estate | 2025 |
| HD Holdings AS | | 2016 |
| HD Hyundai Oslo Liaison Office Nuf | Administrative & support | 2019 |
| HD Korea Shipbuilding & Offshore Engineering Co., Ltd. Nuf | Professional & scientific | 2024 |
| HD Transport AS | Transport & logistics | 2023 |
| HDG16 Parkering AS | Real estate | 2021 |
| Hdgv Capital AS | | 2023 |
| HDH & SP Rådgivning AS | Financial services | 2020 |
| HDH Holding AS | Information & communication | 2024 |
| Hdi Global SE Nuf | Financial services | 2008 |
| HDS AS | Transport & logistics | 1982 |
| HDS Invest AS | | 2022 |
| HDT Holding AS | Wholesale & retail | 2013 |
| He Agency AS | Wholesale & retail | 2018 |
| He Drift AS | Administrative & support | 2020 |
| He Og Ho Holding AS | Real estate | 2021 |
| He Prosjektinvest AS | Real estate | 2017 |
| He Reserve A2026 AS | Real estate | 2026 |
| He Reserve B2026 AS | Real estate | 2026 |
| He-He AS | | 2021 |
| HE2W Holding AS | Professional & scientific | 1979 |
| Hea Invest AS | Professional & scientific | 2009 |
| Head Capital AS | | 2021 |
| Head Energy Multicontrol Oslo AS | Professional & scientific | 2026 |
| Head Frisør Sandefjord AS | Other services | 2022 |
| Head Hair & Beauty AS | Other services | 2010 |
| Head Skills AS | Other services | 2013 |
| HEAD4MORE AS | Professional & scientific | 2011 |
| HEAD4MORE International AS | Administrative & support | 2011 |
| Headhunter-Agency Group AS | Professional & scientific | 1998 |
| Headhunteren AS | Administrative & support | 2020 |
| Headhunterinfo AS | Administrative & support | 2019 |
| Headland Holding AS | | 1999 |
| Headly AS | Information & communication | 2024 |
| Headmarket AS | Information & communication | 2016 |
| Headnorth AS | Administrative & support | 2015 |
| Headon Holding AS | Administrative & support | 2025 |
| Headon Rekruttering AS | Administrative & support | 2025 |
| Headpower AS | Health & social care | 2016 |
| Headquarter AS | Administrative & support | 2002 |
| Headquarters AS | Professional & scientific | 2025 |
| Heads for Hire AS | Professional & scientific | 2020 |
| Headwater Holding AS | | 2026 |
| Heal AS | | 2024 |
| Health Angels AS | Arts & recreation | 2024 |
| Health Industry Da | Wholesale & retail | 2004 |
| Health Sector Systems AS | Information & communication | 2021 |
| Health Tech Holding AS | | 2020 |
| Health Tech Invest AS | Financial services | 2020 |
| Health Unique Group AS | Wholesale & retail | 1998 |
| Health Vibes Institute Da | Wholesale & retail | 2002 |
| Healthcare Alliance AS | Professional & scientific | 2025 |
| Healthco Holding AS | Financial services | 2018 |
| Healthcom AS | Information & communication | 2005 |
| Healthguard Systems AS | Information & communication | 2020 |
| Healthwave Ventures AS | Health & social care | 2021 |
| Healthy & Wellness Nichnatsdaman AS | Other services | 2019 |
| Healthy Pointers AS | Professional & scientific | 2007 |
| Healthy Solution AS | Wholesale & retail | 2016 |
| Hean AS | | 1984 |
| Hear IT AS | Health & social care | 2015 |
| Hear IT B2B AS | Wholesale & retail | 2016 |
| Heart Med AS | Health & social care | 2021 |
| Heart Tec AS | Health & social care | 2000 |
| Heartattack and Wines AS | Financial services | 2024 |
| Heartbeat AS | Arts & recreation | 2010 |
| Heartbreak Ans | Wholesale & retail | 1989 |
| Heartbreak AS | Professional & scientific | 1990 |
| Heartfield AS | | 2024 |