| Glis Forvaltning AS | Real estate | 2021 |
| Global Invest Consulting AS | Real estate | 2014 |
| Gma Restaurant AS | Hospitality | 2021 |
| Gnosjö Konstsmide Norge AS | Manufacturing | 2008 |
| Go Sprinkler AS | Professional & scientific | 2012 |
| Goddi AS | Arts & recreation | 2018 |
| Gode Baktus AS | Manufacturing | 2015 |
| Gode Rom Interiørarkitektur AS | Professional & scientific | 2020 |
| Godt Hus Hamar AS | Real estate | 2006 |
| Godt Selskap 33 AS | Real estate | 2022 |
| Golden Night Ans | Hospitality | 2002 |
| Gomes Ltd Nuf | Wholesale & retail | 2007 |
| Grafika AS | Professional & scientific | 2000 |
| Grafika Digitaltrykk AS | Manufacturing | 2000 |
| Grand Rehabilitering AS | Professional & scientific | 2024 |
| Greekstreet AS | Hospitality | 2025 |
| Greenwheels Da | Professional & scientific | 2009 |
| Griffin Audio AS | Wholesale & retail | 2020 |
| Grunnmurspesialisten AS | Construction | 2006 |
| Græsby Eiendom AS | Administrative & support | 2016 |
| Græsby Invest AS | | 2022 |
| Grøde Eiendom AS | Real estate | 2019 |
| Grøneng AS | Real estate | 2024 |
| Grønnegata 102 AS | Real estate | 2019 |
| Grønnegata 104 AS | Real estate | 2025 |
| Grønnegata 40 Reorg AS | Real estate | 2021 |
| Grønnegata 55 AS | Real estate | 2013 |
| Grønnegaten 1 AS | | 2005 |
| Grønnhuset AS | Real estate | 2022 |
| Grønske AS | Hospitality | 2012 |
| Grønt Mikrohus AS | Real estate | 2024 |
| Gse Holding AS | Financial services | 2007 |
| Gullbrev.No AS | Wholesale & retail | 2011 |
| Gullhjørnet Ans | Manufacturing | 1990 |
| Gullkorn Ølbar AS | Hospitality | 2014 |
| Gullsmed J Sten Bøe AS | Wholesale & retail | 1986 |
| Gullsmed K O Liberg AS | Wholesale & retail | 1975 |
| Gullsmed P. Børke AS | Wholesale & retail | 2012 |
| Gunnmagdalena AS | Administrative & support | 2015 |
| Gunstig Intelligens AS | Information & communication | 2025 |
| Gunvor Mosvold AS | Health & social care | 2023 |
| Guru AS | Financial services | 2005 |
| Gustava Holding AS | | 2023 |
| Gyllen AS | Manufacturing | 2025 |
| Gyllna Skor AS | Financial services | 2005 |
| Gåsehud AS | Professional & scientific | 2018 |
| H Fjeldvær Montering AS | Wholesale & retail | 2001 |
| H Sandberg AS | | 2018 |
| H Sverdrup Industrier AS | | 2003 |
| H Yoga AS | Education | 2022 |
| H.H Holding AS | | 2019 |
| Ha Tannlege AS | Health & social care | 2010 |
| Haakonsgate 42 AS | Real estate | 2016 |
| Haakonsgate 44 AS | Real estate | 2016 |
| Hablikk AS | Construction | 1990 |
| Habo AS | Real estate | 1993 |
| Hafnor Invest AS | | 2020 |
| Hagen & Lyssand Terapi Og Veiledning AS | Health & social care | 2018 |
| Hagen Mat AS | Wholesale & retail | 2025 |
| Hagens Transport AS | Transport & logistics | 2005 |
| Hagens Transport Eiendom AS | Transport & logistics | 2007 |
| Hagl Fly AS | Administrative & support | 2022 |
| Hai Smaksopplevelser AS | Hospitality | 2008 |
| Hai Streetfood AS | Hospitality | 2014 |
| Haka Creek Holding AS | | 2026 |
| Hakket Bedre AS | Wholesale & retail | 2023 |
| Haleh Rad Holding AS | | 2026 |
| Halo Vind Da | Professional & scientific | 2025 |
| Halsetsvea 34 AS | Real estate | 2018 |
| Halsetsvea 36 AS | Real estate | 2021 |
| Ham - Tann AS | Manufacturing | 2016 |
| Hamar Arbeiderblad AS | Information & communication | 1998 |
| Hamar Autoshine AS | Other services | 2024 |
| Hamar Begravelsesbyrå AS | Other services | 1988 |
| Hamar Bilpleie Og Bilvask AS | Other services | 2013 |
| Hamar Bilutleie AS | Administrative & support | 2000 |
| Hamar Boligbygg AS | Construction | 2014 |
| Hamar Boliginvest AS | Real estate | 2014 |
| Hamar Brydderi AS | Construction | 2023 |
| Hamar Bygg & Graving AS | Construction | 2022 |
| Hamar Bygg AS | Construction | 2008 |
| Hamar Byggmaster AS | Construction | 2014 |
| Hamar Byggtakst AS | Real estate | 2012 |
| Hamar Båtutleie Da | Administrative & support | 2009 |
| Hamar Catering AS | Hospitality | 2013 |
| Hamar Colonialforrætning AS | Information & communication | 2016 |
| Hamar Dekk AS | Wholesale & retail | 2013 |
| Hamar Dyreklinikk AS | Professional & scientific | 2009 |
| Hamar Eiendom AS | Real estate | 2019 |
| Hamar Eiendomsmegling AS | Real estate | 2016 |
| Hamar Flis Og Bad AS | Wholesale & retail | 1998 |
| Hamar Friends AS | Hospitality | 2011 |
| Hamar Fysioterapi AS | Health & social care | 2021 |
| Hamar Glasmagasin AS | Wholesale & retail | 1926 |
| Hamar Glass AS | Construction | 1982 |
| Hamar Golf AS | Administrative & support | 2026 |
| Hamar Gynekologi AS | Health & social care | 2009 |
| Hamar Gårdsbarnehage AS | Education | 2023 |
| Hamar Helse - Annestesi AS | Health & social care | 2004 |
| Hamar Hotelldrift AS | Hospitality | 1997 |