| Gjøvik Drift AS | Wholesale & retail | 2022 |
| Gjøvik Eiendom AS | Real estate | 2002 |
| Gjøvik El-Installasjon AS | Construction | 2004 |
| Gjøvik Elektriske AS | Wholesale & retail | 1988 |
| Gjøvik Elektro AS | Construction | 2012 |
| Gjøvik Elektroinstallasjon AS | Real estate | 2004 |
| Gjøvik Fargehandel AS | Wholesale & retail | 2015 |
| Gjøvik Flispartner AS | Wholesale & retail | 2002 |
| Gjøvik Frisør AS | Other services | 1994 |
| Gjøvik Fysioterapi AS | Health & social care | 2020 |
| Gjøvik Glasservice AS | Wholesale & retail | 2006 |
| Gjøvik Glassverk AS | Real estate | 2007 |
| Gjøvik Halal Kjøtt AS | Wholesale & retail | 2026 |
| Gjøvik Halal Kjøtt Og Varer Ans | Wholesale & retail | 2005 |
| Gjøvik Hengerutleie AS | Administrative & support | 2026 |
| Gjøvik HLL AS | Real estate | 2026 |
| Gjøvik Hotelldrift AS | Hospitality | 1995 |
| Gjøvik Hud Og Fotterapi AS | Health & social care | 2020 |
| Gjøvik Innkjøpslag SA | Wholesale & retail | 1986 |
| Gjøvik Innredning AS | Wholesale & retail | 2022 |
| Gjøvik Installasjon AS | Administrative & support | 1988 |
| Gjøvik Invest AS | Real estate | 2020 |
| Gjøvik Jiu-Jitsu AS | Other services | 2014 |
| Gjøvik Kulturhus AS | Real estate | 2020 |
| Gjøvik Last AS | Transport & logistics | 1997 |
| Gjøvik Møbel Og Interiør AS | Wholesale & retail | 2002 |
| Gjøvik Og Toten Vask Og Rens AS | Other services | 2007 |
| Gjøvik Olympiske Anlegg AS | Arts & recreation | 1990 |
| Gjøvik Optikk AS | Wholesale & retail | 1995 |
| Gjøvik Pizza AS | Hospitality | 2003 |
| Gjøvik Prosjekt AS | Real estate | 2007 |
| Gjøvik Psykomotoriske Senter AS | Health & social care | 2021 |
| Gjøvik Regnskapslag SA | Professional & scientific | 1981 |
| Gjøvik Rådhus AS | Real estate | 1975 |
| Gjøvik Science Park AS | Real estate | 2017 |
| Gjøvik Sjoko AS | Manufacturing | 2022 |
| Gjøvik Specsavers AS | Wholesale & retail | 2019 |
| Gjøvik Strand AS | Real estate | 2014 |
| Gjøvik Takst AS | Professional & scientific | 2022 |
| Gjøvik Tannlegekontor AS | Health & social care | 2013 |
| Gjøvik Tannlegesenter AS | Health & social care | 2013 |
| Gjøvik Taxi AS | Transport & logistics | 2014 |
| Gjøvik Tomteselskap AS | Real estate | 2021 |
| Gjøvik Trafikkskole AS | Education | 2000 |
| Gjøvik Ultralyd - Kim Og Erik Da | Administrative & support | 2024 |
| Gjøvik Ur & Gull AS | Wholesale & retail | 2002 |
| Gjøvik Utleie AS | Real estate | 2002 |
| Gjøvik Vaktmestertjenester Da | Administrative & support | 2007 |
| Gjøvik Øre Nese Hals AS | Health & social care | 2019 |
| Gjøviks Blad AS | Information & communication | 2021 |
| Gjøvikterminalen AS | Transport & logistics | 2020 |
| Glis Holding AS | Health & social care | 2016 |
| Glis Tannregulering AS | Health & social care | 2025 |
| Glomseth AS | | 2012 |
| GLS Record Ans | Administrative & support | 1988 |
| GLT Eiendomsmegling AS | Real estate | 2021 |
| GMC Software Technology Limited | Information & communication | 2014 |
| Gms-Gjøvik Motor Service AS | Wholesale & retail | 1996 |
| Gobb Bolig AS | Real estate | 2020 |
| Gobb Dele AS | Real estate | 2014 |
| Gobb Prosjekt AS | Real estate | 1985 |
| Gode Investeringer AS | Professional & scientific | 2006 |
| Goodfellas AS | Other services | 2022 |
| Goto Media AS | Professional & scientific | 2012 |
| GP Byggkontroll AS | Professional & scientific | 2023 |
| Grafisk Byrå AS | Professional & scientific | 2014 |
| Grand Gjøvik AS | Hospitality | 2009 |
| Grandkvartalet Gjøvik AS | Real estate | 1984 |
| Green Swan AS | Professional & scientific | 2026 |
| Greenball AS | | 2022 |
| Grogrunden AS | Professional & scientific | 2020 |
| GSF AS | Health & social care | 2008 |
| GTR Autoimport AS | Wholesale & retail | 2021 |
| Gudbrandsdalsvegen 196 AS | Real estate | 2006 |
| Guendouz Holding AS | Real estate | 2005 |
| Guerpa AS | | 2019 |
| Gulvavretting AS | Construction | 2022 |
| Guss AS | Real estate | 2005 |
| Gutta I Dampen AS | Hospitality | 2009 |
| GVS Eiendom Gjøvik AS | Construction | 2009 |
| GW. Holding AS | | 2021 |
| Gythfeldt AS | | 2023 |
| H Bratberg AS | Construction | 2019 |
| H2 Holding AS | Real estate | 2010 |
| Haak AS | Wholesale & retail | 2015 |
| Haakon M Jostad AS | Wholesale & retail | 2012 |
| Haavi AS | Real estate | 2012 |
| Haavi Holding AS | Real estate | 2015 |
| Haavis Flis & Mur Tjenester AS | Construction | 2023 |
| Hacemo Invest AS | Real estate | 2019 |
| Hadelandsvegen 2 AS | Real estate | 2018 |
| Hadelandsvegen 4 AS | Real estate | 2018 |
| Haff Invest AS | | 2023 |
| Hage Og Fritidsmaskiner AS | Wholesale & retail | 2019 |
| Hagebakken Holding AS | | 2025 |
| Hageservice Gjøvik AS | Administrative & support | 2021 |
| Hair & There Gjøvik AS | Other services | 1995 |
| Hair Frisør AS | Other services | 2015 |
| Haja Holding AS | | 2023 |
| Hajala AS | Professional & scientific | 2024 |