| Hamar Hudpleieklinikk AS | Other services | 2015 |
| Hamar Industribygg AS | Real estate | 2013 |
| Hamar Interiørsenter AS | Wholesale & retail | 2016 |
| Hamar Kampsport SA | Education | 2014 |
| Hamar Kiropraktorklinikk Da | Health & social care | 2009 |
| Hamar Kiropraktorsenter AS | Health & social care | 2013 |
| Hamar Kulde- Og Klimateknikk AS | Construction | 2024 |
| Hamar Kunst Og Ramme AS | Wholesale & retail | 2012 |
| Hamar Legesenter Da | Health & social care | 2011 |
| Hamar Maling Og Vedlikehold Da | Construction | 2003 |
| Hamar Maskinservice AS | Manufacturing | 2007 |
| Hamar Minilager AS | Real estate | 2010 |
| Hamar Mjøsa Pizza AS | Hospitality | 2026 |
| Hamar Næringspark AS | Professional & scientific | 2022 |
| Hamar Næringspark Sør AS | Real estate | 2022 |
| Hamar Olympiske Anlegg AS | Arts & recreation | 1990 |
| Hamar Optikk AS | Wholesale & retail | 2005 |
| Hamar Ortopediske AS | Health & social care | 2025 |
| Hamar Ortopediske AS | Health & social care | 1990 |
| Hamar Pizza AS | Hospitality | 1997 |
| Hamar Porteføljefabrikk AS | Wholesale & retail | 1976 |
| Hamar Regnskap AS | Professional & scientific | 2015 |
| Hamar Reiseeffekter AS | Wholesale & retail | 1993 |
| Hamar Renseri AS | Other services | 2025 |
| Hamar Rørleggerbedrift AS | Construction | 2017 |
| Hamar Sentrum AS | Professional & scientific | 2025 |
| Hamar Spisested Og Catering AS | Hospitality | 2021 |
| Hamar Storsenter Holding AS | Real estate | 2022 |
| Hamar Tannlegevakt AS | Health & social care | 2019 |
| Hamar Taxi AS | Transport & logistics | 1997 |
| Hamar Teater AS | Arts & recreation | 2016 |
| Hamar Trafikkskole AS | Education | 1985 |
| Hamar Ur Og Smykker AS | Wholesale & retail | 2016 |
| Hamar Utleieboliger AS | Construction | 1995 |
| Hamar Utvikling 2 AS | Real estate | 2024 |
| Hamar Utvikling 3 AS | Real estate | 2025 |
| Hamar Utvikling AS | | 2021 |
| Hamar Varme AS | Wholesale & retail | 2016 |
| Hamar Varmepumpeservice AS | Construction | 2023 |
| Hamarbarnehagen AS | Education | 2009 |
| Hamarklinikken AS | Health & social care | 2013 |
| Hamarkontoret AS | Real estate | 2019 |
| Hamarrevisjon AS | Professional & scientific | 2009 |
| Hamarsopp AS | Agriculture & fishing | 2026 |
| Hamarveien Utvikling AS | Real estate | 2018 |
| Hamirai Holding AS | | 2025 |
| Hamjern Eiendom AS | Real estate | 1992 |
| Hamjern Eiendomsdrift AS | Administrative & support | 2023 |
| Hamjern Invest AS | Manufacturing | 2019 |
| Hamkamhuset Da | Real estate | 2019 |
| Hamninga AS | Wholesale & retail | 2005 |
| Hamresanden Boligutvikling AS | Real estate | 2007 |
| Hanlar AS | Real estate | 1993 |
| Hansa Og Tone AS | Hospitality | 2023 |
| Hansen's Rørservice AS | Construction | 2013 |
| Hapo Eiendom AS | Real estate | 2023 |
| Harald Jorkjend Invest Elverum AS | Real estate | 2007 |
| Harald Jorkjend Invest Tynset AS | Real estate | 2007 |
| Harald Rygh - Rådgivende Ingeniør AS | Professional & scientific | 2025 |
| Harby Prosjektstyring AS | Professional & scientific | 2021 |
| Haro Treservice AS | Agriculture & fishing | 2022 |
| Harpers Development AS | Professional & scientific | 2024 |
| Harpers Holding AS | Professional & scientific | 2023 |
| Harveyoga AS | Education | 2021 |
| Has Live AS | Arts & recreation | 2021 |
| Hasan Invest AS | Wholesale & retail | 2017 |
| Haugans Energi AS | | 2025 |
| Haugans Halmstrå AS | Financial services | 2015 |
| Haugans Hus Holding AS | Real estate | 2018 |
| Haugans Hus Invest AS | Real estate | 2018 |
| Haugans Hus Markedsinvest AS | | 2019 |
| Haugans Lotteri AS | Arts & recreation | 2004 |
| Haugenconsult AS | Professional & scientific | 2023 |
| Hawaii Hamar AS | Hospitality | 2020 |
| Haze Vind Da | Energy | 2024 |
| HC Hamar AS | Other services | 2023 |
| HD Montasje AS | Construction | 2012 |
| Hebi Holding AS | | 2023 |
| Heder AS | Professional & scientific | 2023 |
| Hedia AS | Information & communication | 2011 |
| Hedmark Byggtjenester AS | Construction | 2012 |
| Hedmark Fylkeskraft AS | Public administration | 2004 |
| Hedmark Landhandleri Da | Wholesale & retail | 2013 |
| Hedmark Låsservice AS | Manufacturing | 2000 |
| Hedmark Næringseiendom AS | Real estate | 2021 |
| Hedmarkdata Da | Wholesale & retail | 2002 |
| Hedmarken Invest AS | Real estate | 2018 |
| Hege Loe AS | | 2025 |
| Heggedalsveien 11 AS | Real estate | 2006 |
| Heggelund & Elisenberg AS | Real estate | 1999 |
| Heggvin Utvikling AS | Professional & scientific | 2021 |
| Heiark AS | Professional & scientific | 2015 |
| Heiken Holding AS | | 2015 |
| Heim Hamar AS | Hospitality | 2018 |
| Helge Bjørge AS | Transport & logistics | 2022 |
| Helge Flatgård AS | Information & communication | 2021 |
| Helgestad Holding AS | Real estate | 2010 |
| Hellas Hamar AS | Hospitality | 2012 |
| Helmatch Eiendom AS | Real estate | 2009 |
| Helset Holdings AS | Information & communication | 2021 |