| Fjellhamarklinikken AS | Health & social care | 2014 |
| Flava Oslo AS | Wholesale & retail | 2013 |
| Flemming Karlberg AS | Financial services | 2012 |
| Flisemannen AS | Construction | 2011 |
| Flo Finans AS | | 2025 |
| Flytaxi Kantine AS | Construction | 2020 |
| Fløtre Holding AS | Real estate | 1996 |
| Focus Investment AS | Real estate | 2017 |
| Folkets Hus Lørenskog AS | Real estate | 1929 |
| Forset AS | | 2008 |
| Forward AS | | 2018 |
| Foss Maskinagentur AS | Wholesale & retail | 2014 |
| Fotograf Klavestad AS | Professional & scientific | 1997 |
| Frami Activity AS | Information & communication | 2021 |
| Frank AS | Professional & scientific | 2021 |
| Friisinvest AS | | 2020 |
| Friluftspartner AS | Arts & recreation | 2026 |
| Frisk Invest AS | | 2020 |
| Frohu Holding AS | Transport & logistics | 2022 |
| Fru Flo Systue for Bunader AS | Manufacturing | 2020 |
| Fryden AS | Professional & scientific | 2011 |
| Furuholtet 35 AS | Real estate | 2020 |
| FZ Eiendom AS | Real estate | 2018 |
| Gardarike AS | Education | 2020 |
| Garderobemekka AS | Wholesale & retail | 2020 |
| Gastranor AS | Real estate | 2013 |
| Ge Kapital AS | | 2020 |
| Generasjon AS | | 2026 |
| George Transport Og Vaktmester AS | Transport & logistics | 2026 |
| Gfa Invest AS | Real estate | 2018 |
| Gii Holding AS | Real estate | 2022 |
| Gjelten Group AS | Information & communication | 2024 |
| GL Tech AS | Information & communication | 2026 |
| Glassmester 1 AS | Construction | 2006 |
| Glittertind Holding Da | Wholesale & retail | 2010 |
| Globecamper Reiseliv & Media Ans | Professional & scientific | 2010 |
| Gloss Cosmetics Ltd Nuf | Wholesale & retail | 2023 |
| Gode Ting Er Tre AS | Professional & scientific | 2025 |
| Godteslottet AS | Wholesale & retail | 2025 |
| Goinvest AS | | 2005 |
| Granheim Eiendom AS | Real estate | 1994 |
| Grasrotenergi AS | Energy | 2026 |
| GRC Services AS | Professional & scientific | 2014 |
| Green Chili Entertainment AS | Information & communication | 2012 |
| Grorud Bolig 302 AS | Real estate | 2019 |
| Grorud Bolig 407 AS | Real estate | 2023 |
| Grorud Senter Bolig AS | Real estate | 2014 |
| Grønning Urologi AS | Health & social care | 2018 |
| Guldahl Holding AS | Professional & scientific | 2017 |
| Gym Clean Da | Administrative & support | 2021 |
| Hair We Go AS | Wholesale & retail | 2021 |
| Halland-Johansen Holding AS | | 2022 |
| Hanawa Holding AS | Real estate | 2021 |
| Handelshuset Øst AS | Wholesale & retail | 2021 |
| Handyman Renovasjon AS | Construction | 2023 |
| Haneborgåsen Eiendom AS | Real estate | 1996 |
| Hann Eiendom AS | Real estate | 2022 |
| Hansum Eiendom Ans | Real estate | 2016 |
| Happy Pixel AS | Information & communication | 2024 |
| Happy Sweets AS | Wholesale & retail | 2015 |
| Haraldsen VVS Og Eiendom AS | Construction | 2008 |
| Harket & Bakke AS | Education | 2005 |
| Haugseth Invest AS | | 2020 |
| Havard AS | Professional & scientific | 2016 |
| Hawu Eiendom AS | Real estate | 2022 |
| HB Transport AS | Transport & logistics | 2024 |
| HC Fjellhamar AS | Other services | 2019 |
| HCR 1 AS | Information & communication | 2011 |
| Heimegården AS | Hospitality | 2017 |
| Heliko AS | Professional & scientific | 2002 |
| Hellebostad Invest AS | Real estate | 2021 |
| Hewi Group AS | Information & communication | 2026 |
| HK Tjenester AS | Professional & scientific | 2021 |
| HKC AS | Information & communication | 2023 |
| HNF Development AS | | 2023 |
| Holding 2 AS | Energy | 2005 |
| Holt Holding AS | Professional & scientific | 2023 |
| Holt Rådgivning AS | Professional & scientific | 2024 |
| Horisont Håndverk AS | Construction | 2026 |
| Hovedøen AS | | 2024 |
| Humf AS | Real estate | 2022 |
| Hva Nå? Ans | Professional & scientific | 1988 |
| Høgåsen Holding AS | Financial services | 2015 |
| Ideal Elektro AS | Construction | 2026 |
| Idebolig AS | Construction | 2020 |
| Iiyh AS | Real estate | 2014 |
| Inattika AS | Information & communication | 2008 |
| Incremento AS | Real estate | 2006 |
| Indigo Jeans AS | Real estate | 2001 |
| Inor Holding AS | Financial services | 2015 |
| Intelliapp AS | Information & communication | 2026 |
| Intense AS | Administrative & support | 1998 |
| Inventech AS | Professional & scientific | 2009 |
| Investian AS | | 2021 |
| Iox Investments AS | Financial services | 2023 |
| Ipsus AS | | 2014 |
| Isak Vendor AS | | 2020 |
| Isum Holding AS | | 2026 |
| IT Seniorene AS | Information & communication | 2016 |
| J. E. H. Invest AS | Administrative & support | 2005 |