| Evenskjer Syd AS | Real estate | 2020 |
| Evolution Eiendom AS | Real estate | 2020 |
| Exitum Økonomi AS | Professional & scientific | 2018 |
| Expertconstruct AS | Construction | 2020 |
| Explore Harstad AS | Administrative & support | 2024 |
| Expressbilene AS | Administrative & support | 2012 |
| Expressbilene Transport AS | Transport & logistics | 2018 |
| Expressbilene Transportservice AS | Transport & logistics | 2018 |
| Eiendomsselskapet BRT AS | Real estate | 1983 |
| Facility Services AS | Administrative & support | 2019 |
| Facta Service AS | Wholesale & retail | 1989 |
| Fager AS | Professional & scientific | 2014 |
| Fagerlia Familiebarnehage AS | Education | 2016 |
| Fagernesfjellet Eiendom AS | Real estate | 2021 |
| Fagernesfjellet Eiendom II AS | Real estate | 2023 |
| FAMILIE4EVER AS | Wholesale & retail | 2022 |
| Farge Og Flis Harstad AS | Wholesale & retail | 1993 |
| Fegt Holding AS | Wholesale & retail | 2017 |
| Fenesveien 10 AS | Real estate | 2012 |
| Ferra Consult AS | Professional & scientific | 2014 |
| Ferra Industri AS | Wholesale & retail | 2020 |
| Ferra Utvikling AS | Real estate | 2012 |
| Fige Eiendom AS | Real estate | 1998 |
| Fige Holding AS | | 2025 |
| Filthy Rich AS | | 2024 |
| Finance Holding AS | Information & communication | 2008 |
| Financial Risk Management AS | Information & communication | 2011 |
| Finn Tore Aune Agenturer AS | Wholesale & retail | 2008 |
| Finthe Holding AS | | 2024 |
| Firkanten Holding AS | Real estate | 2025 |
| Fisk & Fritid AS | Administrative & support | 2022 |
| Fisk & Tur AS | Administrative & support | 2026 |
| Fjellaa Holding AS | | 2020 |
| Fjellvang AS | Construction | 2025 |
| Fjord Rock AS | Transport & logistics | 2014 |
| Fjordgata 11 Harstad AS | Real estate | 2008 |
| Fjordgata 12 Harstad AS | Real estate | 2008 |
| Fjordgata 14 Harstad AS | Real estate | 2008 |
| Fjordgata 2 Harstad AS | Real estate | 2012 |
| Flamefood AS | Hospitality | 2016 |
| Flire AS | Arts & recreation | 2020 |
| Fokus Optikk AS | Wholesale & retail | 2020 |
| Folk I Husan AS | Real estate | 2020 |
| Folk I Rom AS | Professional & scientific | 2024 |
| Follyphone Records Limited Nuf | Information & communication | 2025 |
| Ford Harstad AS | Wholesale & retail | 1993 |
| Forge Bemanning AS | Administrative & support | 2025 |
| Fors Fysio AS | Health & social care | 2014 |
| Forsikringskompaniet AS | Financial services | 2025 |
| Fot I Nord AS | Health & social care | 2023 |
| Fotoelena AS | Professional & scientific | 2021 |
| Frakt Selskapet AS | Transport & logistics | 2024 |
| Framnes Bolig AS | Real estate | 2022 |
| Frank Skogli AS | Real estate | 2014 |
| Fred Hugo AS | Agriculture & fishing | 1993 |
| FREE2MOVE Holding AS | Wholesale & retail | 2021 |
| Freedom Holding AS | Real estate | 2020 |
| Frem Holding AS | Administrative & support | 2004 |
| Fridalen AS | Financial services | 2005 |
| Frisør Anniken Berg AS | Other services | 2017 |
| Frisør Kristin Dankertsen AS | Other services | 2021 |
| Frisør Marte Hansen AS | Other services | 2020 |
| Frisør Susanne Frikstad AS | Other services | 2018 |
| Front Hairdesign AS | Other services | 2007 |
| Front Hairdesign Harstad AS | Other services | 2021 |
| Frostland AS | Professional & scientific | 2015 |
| Frøken Ellingsen Invest AS | Real estate | 2005 |
| FS Graving Og Transport AS | Transport & logistics | 2021 |
| Funker Elektro AS | Construction | 2012 |
| Furuberget Fus Aktivitetsbarnehage AS | Education | 2021 |
| Gabrielsen Hogst AS | Agriculture & fishing | 2023 |
| Gah Consulting AS | Professional & scientific | 2011 |
| Gamas Invest AS | Real estate | 2005 |
| Gamtoftveien 8 AS | Real estate | 2023 |
| Gangsås AS | Real estate | 2022 |
| Gapahuken Fiske Og Fritid AS | Wholesale & retail | 2018 |
| Garn & Sånt AS | Wholesale & retail | 2018 |
| Ge Fysioterapi AS | Health & social care | 2005 |
| Geir Hokland AS | Transport & logistics | 1996 |
| General Fleischers Gate 1 AS | Real estate | 2024 |
| Geocold AS | Professional & scientific | 2010 |
| GH Companies AS | Administrative & support | 2024 |
| GH Multi AS | Administrative & support | 2024 |
| GH Properties AS | Real estate | 2024 |
| Gjøsund Transport AS | Transport & logistics | 2024 |
| Glassmester Ketil Martinsen AS | Construction | 2014 |
| GM Eiendomsutvikling AS | Real estate | 2018 |
| GM Entreprenør Harstad AS | Construction | 2012 |
| GMH AS | Construction | 2016 |
| GMH Holding AS | Real estate | 2016 |
| Gnomen Grupp Oü | Construction | 2016 |
| Gois Catering AS | Hospitality | 2012 |
| Gois Narvik AS | Hospitality | 2025 |
| Gois Restaurant AS | Hospitality | 2023 |
| Grand Easy Living South AS | Hospitality | 2005 |
| Grand Solutions North AS | Hospitality | 2005 |
| Grebstad Medicinske AS | Health & social care | 2018 |
| Green Marine Development AS | Professional & scientific | 2017 |
| Grimsbo AS | | 2023 |
| Grottebadet AS | Arts & recreation | 1997 |