| Hafrsfjordg 37 AS | Households | 1933 |
| Harald A Møller AS | Wholesale & retail | 1936 |
| Harald Mathisen AS | Wholesale & retail | 1986 |
| Haugerud Varmesentral AS | Real estate | 1970 |
| Heidenreich Holding A/S | Financial services | 1988 |
| Herlands Bedrifter AS | Financial services | 1977 |
| Hotel Bristol AS | Hospitality | 1916 |
| Hydrologiservice AS | Professional & scientific | 1986 |
| Häfele SE & Co KG Tyskland Filial Norge Nuf | Professional & scientific | 2013 |
| Häggström AS | Professional & scientific | 2024 |
| Håbe Holding AS | Real estate | 2005 |
| Håbjørg Invest AS | Financial services | 2000 |
| Hågeberg AS | Real estate | 1996 |
| Hågeberg Eiendom AS | Real estate | 2023 |
| Hågård Holding AS | | 2023 |
| Håhjem AS | Real estate | 2010 |
| Håkanes Holding AS | Construction | 2020 |
| Håkansson Invest AS | | 2021 |
| Håkon Bergli Transport AS | Transport & logistics | 2007 |
| Håkon Clausen Holding AS | Financial services | 2016 |
| Håkon Eiendom AS | Real estate | 1995 |
| Håkon Gjesvik Holding AS | Financial services | 2017 |
| Håkon Ims Produksjoner AS | Administrative & support | 2016 |
| Håkon Leknes AS | | 2019 |
| Håkon Lia Holding AS | | 2024 |
| Håkon Lunde Miljø AS | Water & waste | 1999 |
| Håkon Løkensgard Holding AS | Wholesale & retail | 2021 |
| Håkon Mithassel Holding AS | | 2025 |
| Håkon Strand Holding AS | Real estate | 2005 |
| Håkongården AS | Real estate | 2006 |
| Håkonrune Rør AS | Construction | 1992 |
| Håkons Gate 4 AS | Real estate | 2013 |
| Håkonsgaten 26A&B AS | Real estate | 2018 |
| Håkonsgaten 36 Eiendom AS | Real estate | 2014 |
| Håkonshella Marina AS | Real estate | 1977 |
| Håland Næringspark AS | Real estate | 2013 |
| Hålogalandsvegen AS | Construction | 2019 |
| Hån 22 KV AS | Energy | 2019 |
| Håndbakt AS | Hospitality | 2022 |
| Håndbakt Holding AS | Hospitality | 2022 |
| Håndbakt Tøyen AS | Hospitality | 2023 |
| Håndbakt Vollebekk AS | Hospitality | 2022 |
| Håndball.No Da | Professional & scientific | 2000 |
| Håndballmester AS | Education | 2026 |
| Håndfull AS | Wholesale & retail | 2025 |
| Håndplukk AS | Education | 2020 |
| Håndslag AS | Hospitality | 2017 |
| Håndslag Forlag AS | Information & communication | 2007 |
| Håndsrekning AS | Professional & scientific | 2023 |
| Håndstad Eiendom AS | Real estate | 1994 |
| Håndverk AS | Construction | 2025 |
| Håndverker Huset AS | Real estate | 2021 |
| Håndverker Rudningen AS | Construction | 2025 |
| Håndverker Sendyka AS | Construction | 2019 |
| Håndverkeren Lunsjbar AS | Hospitality | 2023 |
| Håndverkergaten 4A AS | Real estate | 2004 |
| Håndverkeriet AS | Construction | 1987 |
| Håndverkerne AS | Professional & scientific | 2024 |
| Håndverkhuset AS | Real estate | 2018 |
| Håndverksboden AS | Wholesale & retail | 2025 |
| Håndverksbygg AS | Construction | 1985 |
| Håndverksforlaget Ans | Information & communication | 2000 |
| Håndverksgruppen Group AS | Construction | 2012 |
| Håndverkskompaniet AS | Construction | 1994 |
| Håndverksservice Ans | Construction | 2005 |
| Håndverksteknikk AS | Construction | 1994 |
| Håndverksteknikk Bygg AS | Construction | 2026 |
| Håndverksveien 1 Langhus AS | Real estate | 2022 |
| Håndverksveien 10-12 AS | Real estate | 1999 |
| Håndverksveien 13-17 AS | Real estate | 2016 |
| Håndverksveien 25 AS | Real estate | 2012 |
| Håndverksveien AS | Real estate | 2013 |
| Håp Invest AS | Agriculture & fishing | 2018 |
| Håpe AS | Financial services | 2007 |
| Håpe Holding AS | | 2026 |
| Hår Ateliet AS | Other services | 2020 |
| Hår Dott Enno AS | Other services | 2004 |
| HÅR1. Kjeden AS | Other services | 2004 |
| Hårete Mål AS | Other services | 2000 |
| Hårgrossisten Oslo AS | Other services | 2023 |
| Hårmoni AS | Other services | 2012 |
| Hårmony AS | Other services | 2010 |
| Hårspesialisten AS | Other services | 2018 |
| Hårstad Eckhoff Holding AS | | 2021 |
| Hårtufsen Frisør Ans | Other services | 1996 |
| Håseth Holding AS | Wholesale & retail | 2004 |
| Håsi AS | Professional & scientific | 1997 |
| Håskjold Holding AS | | 2020 |
| Håti Holding AS | | 2019 |
| Håvar Karlsen Holding AS | Information & communication | 2019 |
| Håvar Karlsen Produksjon AS | Information & communication | 2019 |
| Håvard Byrkjeland AS | Information & communication | 2015 |
| Håvard Dalen AS | Information & communication | 2025 |
| Håvard Høiby Holding AS | Financial services | 2018 |
| Håvard Riber AS | Financial services | 2005 |
| Håvard S Braaten Invest AS | Professional & scientific | 2013 |
| Håvet 2 AS | Real estate | 2008 |
| Håvet Eiendom AS | Real estate | 2021 |
| Håvi AS | Real estate | 1988 |
| Håøyane AS | | 2025 |