| Hagegata 22-24 AS | Real estate | 2013 |
| Hagegata 25 AS | Real estate | 2015 |
| Hagegata 25 Næring AS | Real estate | 2013 |
| Hagegata 56 AS | Real estate | 2022 |
| Hagegata De 21 AS | Real estate | 2020 |
| Hagegata Holding AS | Professional & scientific | 2022 |
| Hagegata Utvikling AS | Real estate | 2013 |
| Hagegata Utvikling II AS | Real estate | 2017 |
| Hagegaten 27 Ans | Real estate | 2001 |
| Hagegaten 32 AS | Real estate | 2016 |
| Hagegutta AS | Administrative & support | 2021 |
| Hagejordet Utvikling AS | Real estate | 2010 |
| Hagekonsept AS | Wholesale & retail | 2016 |
| Hagelund Capital AS | | 2025 |
| Hagem Holding AS | Financial services | 2005 |
| Hagen & Trønsdal AS | Other services | 2000 |
| Hagen Cafe AS | Hospitality | 2008 |
| Hagen Gjenvinning AS | Construction | 2012 |
| Hagen Hooolding AS | | 2026 |
| Hagen Hus AS | Real estate | 2022 |
| Hagen Malm Booking | Professional & scientific | 1998 |
| Hagen Og Bryhn AS | Professional & scientific | 2017 |
| Hagen Technology AS | Information & communication | 2016 |
| Hagen Transport AS | Transport & logistics | 2013 |
| Hagen VVS AS | Construction | 2004 |
| Hagen, Berger & Aas AS | Professional & scientific | 2005 |
| Hagencorp AS | Information & communication | 2018 |
| Hagenes Eiendom AS | Real estate | 2019 |
| Hagenes Kapital AS | Wholesale & retail | 2017 |
| Hagenesgruppen AS | Wholesale & retail | 1989 |
| Hagengnom AS | Information & communication | 2024 |
| Hagenhuset AS | Professional & scientific | 2015 |
| Hagens Holding AS | | 2022 |
| Hagens Jakt Og Skytesenter AS | Real estate | 2013 |
| Hagens Våpenforretning AS | Wholesale & retail | 2008 |
| Hagenstølen AS | Real estate | 2021 |
| Hagesider AS | Wholesale & retail | 2021 |
| Hagestubb AS | Real estate | 2005 |
| Hagevegen 1 Eiendom AS | Real estate | 2019 |
| Haghighi Eiendom | Real estate | 2010 |
| Hagi AS | Professional & scientific | 2020 |
| Haginvest AS | | 2024 |
| Hagland & Partners AS | | 2025 |
| Hagle AS | Information & communication | 2024 |
| Haglund Capital AS | | 2026 |
| Haglund Enge Holding AS | Manufacturing | 2019 |
| Haglundveien Utvikling AS | Real estate | 2021 |
| Hagløfs AS | Wholesale & retail | 1900 |
| Hagneset Park AS | Real estate | 2007 |
| Hagness Invest AS | Real estate | 2007 |
| Hagro AS | | 2024 |
| Hagstrøm AS | Real estate | 2015 |
| Hagtex AS | Wholesale & retail | 1993 |
| Hah Invest AS | Real estate | 2005 |
| Haha Business AS | Information & communication | 2021 |
| Haha Media AS | Information & communication | 2023 |
| Hahaca AS | Financial services | 2017 |
| Hahai AS | Information & communication | 2016 |
| Hahainvest AS | Financial services | 2015 |
| Hahau 748 Holding AS | | 2023 |
| Hahn Holding AS | | 2020 |
| Hai Eiendom AS | | 2021 |
| Hai Holding AS | Information & communication | 2016 |
| Hai Ku AS | Information & communication | 2020 |
| Hai Maling Og Vedlikehold AS | Construction | 2022 |
| Hai Sushi AS | Hospitality | 2014 |
| Haiben AS | Real estate | 2019 |
| Haicon AS | | 2022 |
| Haidari Transport AS | Transport & logistics | 2012 |
| Haider Varetransport AS | Transport & logistics | 2021 |
| Haiens Bilvask AS | | 2024 |
| Haieren Og Bakke Skog Ans | Agriculture & fishing | 2004 |
| Haig Capital AS | Financial services | 2026 |
| Haig Operations AS | Financial services | 2026 |
| Haik Norway AS | Transport & logistics | 2024 |
| Haile Capital AS | | 2021 |
| Hailstorm Holding AS | Financial services | 2015 |
| Haime Holdings AS | | 2020 |
| Hainan Airlines Holding Company Limited Oslo Office Nuf | Transport & logistics | 2019 |
| Hainvest AS | Real estate | 2016 |
| Haion Holding AS | | 2025 |
| Haion Invest AS | Real estate | 2025 |
| Hair & There Kiellandshus AS | Other services | 2006 |
| Hair Aker Brygge AS | Other services | 1998 |
| Hair Beauty AS | Other services | 2013 |
| Hair Beauty Skøyen AS | Other services | 2025 |
| Hair Cutting District Utd AS | Other services | 2018 |
| Hair I Am AS | Other services | 2011 |
| Hair Loft AS | Other services | 2006 |
| Hair Lounge City AS | Other services | 2011 |
| Hair Masters Barbershop AS | Other services | 2020 |
| Hair Program Holding AS | Other services | 2019 |
| Hair Program International AS | Wholesale & retail | 2013 |
| Hair Program Nordic AS | Other services | 2019 |
| Hair Solution AS | Wholesale & retail | 2013 |
| Hair'D Master Barbershop AS | Other services | 2023 |
| Haircontrast AS | Other services | 2007 |
| Hairdo AS | Other services | 2014 |
| Hairpilots AS | Information & communication | 2026 |
| Hairstation AS | Other services | 2005 |