| Fire and Security Systems AS | Melhus | 2019 |
| Fire Fire AS | Askim | 2014 |
| Fire Holdco AS | Oslo | 2022 |
| Fire Security and Network Da | Spydeberg | 2004 |
| Fire Topco AS | Oslo | 2022 |
| Fire Vegger AS | Lørenskog | 2010 |
| Firecontrol Norway | Se-611 31 Nyköping | 2018 |
| Firesafe AS | Lørenskog | 1990 |
| Firesafe Group AS | Lørenskog | 2022 |
| Firing & Thorsen AS | Horten | 2003 |
| Firing AS | Larvik | 2024 |
| Firma - Holding AS | Trøgstad | 2005 |
| Firma ARBEIDSKAR1 AS | Krokelvdalen | 2025 |
| Firma Budowlana Marek Milewski | 33-332 Florynka | 2006 |
| Firma Budowlano Kamieniarska Ireneusz Strzelczyk | Pl-42-134 Truskolasy | 2017 |
| Firma Handlowo-Uslugowa Pek Piotr Adamkiewicz | 63-720 Kozmin Wlkp | 2013 |
| Firma Handlowo-Uslugowa Trade and Service Company Zbigniew Sitko | 87-400 Golub-Dobrzyn | 2015 |
| Firma Patoka Kazimiers Patoka | Pl-70-201 Szczecin | 2011 |
| Firma Remontowo Budowlana Jòsef Karpinski | Pl-09-402 Plock | 2008 |
| Firma Remontowo Budowlana Lech Widulinski | Lier | 2005 |
| Firma Remontowo-Budowlana Piotr Ulowski | Pl-26-307 Bialaczow | 2011 |
| Firma Rick Bruggeling | Fi-64510 Nämpnäs | 2024 |
| Firma Uslogowa Tomasz Kramarczyk Nuf | 32-608 Osiek | 2026 |
| Firma Uslugowa Bolc Andrzej Bolc | 07-402 Lelis | 2009 |
| Firma Uslugowa Marcin Szalbot | Langesund | 2006 |
| Firma Uslugowa Seb | Sylling | 2005 |
| Firma Uslugowa Stanislaw Walkusz | 83-334 Miechucino | 2015 |
| Firma Ustusoua Nor-Pol | Sylling | 2005 |
| Firma Worwa AS | Hafrsfjord | 2015 |
| Firmainvest AS | Oslo | 2017 |
| First Choice Inspection Ltd | Birkenhead Ch42 1Pe | 2019 |
| First Mover Group AS | Oslo | 2017 |
| First Mover Group Holding AS | Oslo | 2018 |
| Fischer AS | Lillehammer | 2019 |
| Fischer Baubot Services GmbH | At-2514 Traiskirchen | 2025 |
| Fishtech Hygena AS | Hundeidvik | 2014 |
| Fiskaa Entreprenør AS | Jessheim | 2024 |
| Fiskaa Maskin AS | Fiskå | 2007 |
| Fiske Holding AS | Surnadal | 2014 |
| Fiskebeck Handverk AS | Kirkenes | 1998 |
| Fiskebeinparkett AS | Tvedestrand | 2007 |
| Fiskebekk AS | Vigrestad | 2022 |
| Fisker Skanderborg | Dk-8860 Skanderborg | 2015 |
| Fisknes Snekkerservice AS | Verdal | 2025 |
| Fisktjønnli Va AS | Mo I Rana | 2021 |
| Fiskvik Entreprenør AS | Tylldalen | 2013 |
| Fiskå & Næss Maskin AS | Stavanger | 2017 |
| Fiskå Maskin AS | Tau | 2008 |
| Fiskå Maskin Startup 2 AS | Tau | 2009 |
| Fitjar Elektro AS | Fitjar | 2026 |
| Fitters AS | Oslo | 2022 |
| Five Elektro AS | Mjøndalen | 1994 |
| Five Holding AS | Mjøndalen | 2005 |
| Fivelsdal AS | Jevnaker | 2016 |
| Fix AS | Hattfjelldal | 2015 |
| Fix Båt AS | Høvik | 2022 |
| Fix El Og Rør AS | Oslo | 2025 |
| Fix Elektro AS | Heimdal | 2025 |
| Fix Ferdig AS | Oslo | 2021 |
| Fix Hus AS | Oslo | 2022 |
| Fix Interiør AS | Oslo | 2023 |
| Fix IT Easy Marcin Adam Koziol | Ridabu | 2013 |
| Fix Man AS | Larvik | 2025 |
| Fix N Paint AS | Revetal | 2022 |
| Fix Rør AS | Sofiemyr | 2012 |
| Fix Rør Service AS | Sofiemyr | 2019 |
| Fix Solutions AS | Porsgrunn | 2025 |
| Fix-It Rørfornying AS | Frogner | 2024 |
| Fixarn AB | Se-938 32 Arjeplog | 2017 |
| Fixdesign AS | Strømmen | 2022 |
| Fixel - Din Elektriker På Dagen AS | Oslo | 2009 |
| Fixer AS | Tau | 2023 |
| Fixera AS | Oslo | 2018 |
| Fixern Innlandet AS | Otta | 2025 |
| Fixit - Bygg Og Anleggsservice AS | Levanger | 2015 |
| Fixit 24 AS | Ål | 2014 |
| Fixit Vedlikehold AS | Hokksund | 2026 |
| Fixnorge AS | Bardufoss | 2022 |
| Fixpro AS | Åfjord | 2023 |
| Fixrix AS | Spikkestad | 2025 |
| Fixtak AS | Åkrehamn | 2025 |
| Fiære Entrepenør AS | Grimstad | 2008 |
| FJ Bygg AS | Raudsand | 2021 |
| FJ Flis & Naturstein AS | Mo I Rana | 2024 |
| FJ Håndverkstjenester AS | Skjeberg | 2022 |
| FJ Maskinentreprenør AS | Berg I Østfold | 2022 |
| Fjaler Mur Og Betong Ans | Straumsnes | 1990 |
| Fjas AS | Bergen | 2012 |
| Fjeld Aktiva AS | Halden | 2022 |
| Fjeld Bygg Og Anlegg AS | Elverum | 2024 |
| Fjeld Bygg Og Tømrertjenester AS | Klavestadhaugen | 2023 |
| Fjeld Håndverk AS | Løken | 2019 |
| Fjeld Tredesign AS | Sellebakk | 2016 |
| Fjeldberg Entreprenør AS | Tranby | 2021 |
| Fjeldberg Rørleggerservice AS | Breistein | 1994 |
| Fjeldbo AS | Spydeberg | 2012 |
| Fjelde Teknikk AS | Narvik | 2023 |
| Fjeldheim Anlegg AS | Skollenborg | 2014 |
| Fjeldheim Bygg AS | Jessheim | 2021 |
| Fjeldhøi Bygg AS | Halden | 2017 |