| Fuglan AS | Administrative & support | 1993 |
| Fugleberg Invest AS | | 2025 |
| Fujimae Norge AS | Wholesale & retail | 2025 |
| Full Steam Activity AS | Administrative & support | 2010 |
| Fun Pub Tromsø AS | Hospitality | 2016 |
| Funksjonell Trening AS | Arts & recreation | 2019 |
| Furen Tre AS | Agriculture & fishing | 2022 |
| Furigan AS | Financial services | 2006 |
| Furigan Eiendom AS | Real estate | 2012 |
| Futara AS | | 2026 |
| Futt! Event & Design AS | Administrative & support | 2007 |
| Futurenergy AS | Professional & scientific | 2026 |
| FX Produksjoner AS Film Og TV | Information & communication | 1995 |
| Fyrin AS | Professional & scientific | 2019 |
| Fyrin Holding II AS | | 2019 |
| Fysioter AS | Health & social care | 2021 |
| FZL Eiendom AS | Real estate | 2021 |
| Fêmea Management AS | Administrative & support | 2024 |
| Føn-Invest AS | Real estate | 2006 |
| Føreland Invest AS | Real estate | 2005 |
| G-Bolig AS | Real estate | 2016 |
| G. Eiendom AS | Professional & scientific | 2005 |
| G.F.Invest AS | Real estate | 2004 |
| G.P.Express AS | Transport & logistics | 2011 |
| Gabrielsen AS | Real estate | 2017 |
| Gabrielsens Regnskapskontor AS | Professional & scientific | 1986 |
| Gaj Holding AS | Real estate | 2020 |
| Galleri Nord AS | Wholesale & retail | 2015 |
| Gammelgård Utbygging AS | Real estate | 2013 |
| Gamnes Da | Real estate | 2011 |
| Gamst Design AS | Professional & scientific | 2018 |
| Gamvollen AS | Real estate | 2021 |
| Gapk AS | Real estate | 2023 |
| Garas AS | | 2020 |
| Gausdalsvegen 28 AS | Real estate | 2021 |
| GCK Holding AS | Real estate | 2019 |
| Gearchecker AS | Information & communication | 2023 |
| Gefa Eiendom AS | Real estate | 2000 |
| Geir Røstad Holding AS | Transport & logistics | 2022 |
| Geir Wing Limited Nuf | Professional & scientific | 2025 |
| Gem Holding AS | Wholesale & retail | 2020 |
| Gem Investeringer AS | Real estate | 2021 |
| Geometria Borealis Da | Construction | 2021 |
| Geopool AS | Professional & scientific | 2023 |
| Gerd Kristiansen Og Åge Johnsen Ans | Arts & recreation | 1996 |
| Gerh Knudsen AS | Real estate | 1924 |
| Get Around Tromsø AS | Administrative & support | 2018 |
| GH Agenturer AS | Wholesale & retail | 2006 |
| GH Bergmo AS | Real estate | 2010 |
| GHK Invest AS | Manufacturing | 2008 |
| Gimle Studentbarnehage AS | Education | 2022 |
| Gimletun AS | Real estate | 2014 |
| Giæver Base AS | Administrative & support | 2017 |
| Giæver Vertskap AS | Professional & scientific | 2019 |
| Gjøa Eiendom AS | Real estate | 2007 |
| Gjøa Gruppen AS | Real estate | 2007 |
| Gjøa O701 AS | Real estate | 2024 |
| GK Renhold AS | Administrative & support | 2018 |
| Glam AS | Other services | 2009 |
| Glass Star AS | Construction | 2026 |
| Glass Tech Tromsø AS | Other services | 2011 |
| Glassmester a. Appelbom AS | Construction | 2007 |
| Glassmester Erling Eriksen AS | Construction | 2006 |
| Glastop Oü Nuf | Construction | 2020 |
| Gleipne AS | Real estate | 2019 |
| Global Exposure Norwegian Shipping Ans | Administrative & support | 1995 |
| Global Food Market AS | Wholesale & retail | 2025 |
| Globesar AS | Professional & scientific | 2010 |
| Glow Studio Tromso AS | Other services | 2024 |
| Glø AS | Professional & scientific | 2007 |
| Glød Estetiske Klinikk AS | Other services | 2024 |
| Gmarcell AS | | 2023 |
| Gme Holding AS | Wholesale & retail | 2024 |
| GML Solheim Holding AS | | 2022 |
| Gmo AS | Real estate | 2021 |
| Gnist Design AS | Information & communication | 2012 |
| Go'Åsen Terasse AS | Real estate | 2007 |
| Gohelg AS | Hospitality | 2017 |
| Golden Hands Wellness Norway AS | Other services | 2019 |
| Golden Sea Restaurant AS | Hospitality | 1996 |
| Goldmane Entertainment AS | Information & communication | 2022 |
| Gondola Bidco AS | | 2023 |
| Gondola Midco AS | | 2024 |
| Gondola Topco AS | | 2024 |
| Good Food AS | Hospitality | 1994 |
| Good Guess Da | Arts & recreation | 2019 |
| Goshamei AS | Other services | 2008 |
| Gotromso AS | Transport & logistics | 2026 |
| Gottor Eiendom AS | Real estate | 2026 |
| Gottor Holding AS | | 2026 |
| Graff Brygghus AS | Manufacturing | 2014 |
| Graff Taproom AS | Hospitality | 2018 |
| Grand Easy Living North AS | Hospitality | 2005 |
| Granheim Bær AS | Agriculture & fishing | 2026 |
| Grasalen AS | Information & communication | 2021 |
| Grav & Spreng AS | Construction | 1998 |
| Grav-Holding AS | | 2025 |
| Gravstell Tromsø AS | Other services | 2022 |
| Gravstell Tromsø Da | Other services | 2020 |
| Greek Style Food AS | Hospitality | 2024 |