| Gustavsen Maskin AS | Harestua | 2012 |
| Gustavsen Rør AS | Larvik | 1979 |
| Gustavsson Hedin AS | Oslo | 2023 |
| Gusterud Bygg AS | Eidsvoll | 2011 |
| Gustu Holding AS | Gjerdrum | 2024 |
| Gutro AS | Sofiemyr | 2013 |
| Gutta Eiendom AS | Nøtterøy | 2014 |
| Gutta Holding AS | Nøtterøy | 2013 |
| Gutta I Slaget Entreprenør AS | Oslo | 2023 |
| Gutta Krutt Holding AS | Asker | 2020 |
| Gutta Probygg Entreprenør AS | Oslo | 2021 |
| Gutta På Jobb AS | Vøyenenga | 2024 |
| Gutta På Taket AS | Sandefjord | 2023 |
| Guttelvik Maskin AS | Revsnes | 2019 |
| Guttorm Maskin Og Transport AS | Lakselv | 2023 |
| Guttormsen Kalk & Anlegg AS | Tvedestrand | 2005 |
| Guttormsen Utleie AS | Hesseng | 2024 |
| Gvarv Maskin Og Service AS | Gvarv | 2005 |
| GVD Holding AS | Brumunddal | 2022 |
| Gvidan Eiendom AS | Brumunddal | 2023 |
| Gvo Offshore Onshore AS | Haugesund | 2024 |
| GVS AS | Oslo | 2017 |
| GVS Eiendom Gjøvik AS | Gjøvik | 2009 |
| Gvvs AS | Tromsø | 2024 |
| GW Installasjon AS | Gamle Fredrikstad | 2024 |
| GWT Gesellschaft Für Wassertechnik Schwimmbad Und Therme GmbH | Oslo | 2015 |
| Gyldenskog AS | Råkvåg | 2005 |
| Gylte Maskin AS | Nordre Frogn | 2023 |
| Gylys AS | Hallingby | 2012 |
| Gyro Inneklima Og Automasjon AS | Halden | 2024 |
| Gyrocraft AS | Porsgrunn | 2014 |
| Gyvybes Pulsas Uab | Lt-01106 Vilnius | 2015 |
| GZ Din Håndverker AS | Heimdal | 2015 |
| Gjøsund Maskinlag A/S | Valderøya | 1988 |
| Gudm. Haugstvedt A/S. | Sortland | 1988 |
| Gäddede Svets O Mek | Se-830 90 Gäddede | 2012 |
| Gården Rørleggerservice AS | Bergen | 1989 |
| Gåsbakk & Sønner AS | Sørli | 1988 |
| Gåseland Bygg Og Anlegg AS | Mandal | 2023 |
| Gåseland Entreprenør AS | Mandal | 2026 |
| Gåsemyr Maskin Og Landbruk AS | Byrkjelo | 2025 |
| Gåsevik Holding AS | Farsund | 2005 |
| Göinge Arnimek AB | 289 50 Hanaskog | 2009 |
| Gösta Carlsons Isoleringsfirma I Hässleholm AB | Se-281 33 Hässelholm | 2008 |
| Götalands El Och Telecom AB Nuf | Oslo | 2026 |
| Göteborgs Kolvringfabrik I Ed AB | Se-668 92 Ed | 2024 |
| Göteborgs Mosaikbeläggningar AB | Se - 418 30 Göteborg | 2013 |
| Göteborgs Spårvägar AB Norsk Avdeling Av Utenlandsk Foretak | Oslo | 1997 |
| Göthbergs El AB | Se-782 33 Malung | 2024 |
| Gølv AS | Ryfoss | 2026 |
| Gøteborgs Malerservice Da | Oslo | 2003 |
| Gøteborgs Ventilservice AB Nuf | 46324 Lilla Edet | 1996 |
| Gøthen AS | Tomter | 2014 |
| Günther Anlegg Og Transport AS | Råde | 2025 |
| Güntner GmbH & Co. KG Nuf | De-82256 Fürstenfeldbruck | 2026 |
| H & E Snekkerservice AS | Mo I Rana | 2026 |
| H & K Sandnes AS | Larvik | 1998 |
| H & M Malerservice AS | Stavanger | 2019 |
| H & MV Engineering Limited | Ie - V94 Yhd6 Limerick | 2017 |
| H & S.P Drift AS | Passebekk | 2007 |
| H a Johannessen AS | Fredrikstad | 2013 |
| H a Johannessen Eiendom AS | Fredrikstad | 1996 |
| H Automasjon AS | Bergen | 2023 |
| H Blix AS | Hammerfest | 1989 |
| H Bratberg AS | Gjøvik | 2019 |
| H Buhaug AS | Kattem | 2019 |
| H Bygg Og Vedlikehold AS | Rjukan | 2025 |
| H Engen AS | Glomfjord | 1989 |
| H Entreprenør AS | Lier | 2024 |
| H F Anlegg Og Skog AS | Setskog | 2020 |
| H Granbo VVS AS | Leinstrand | 2022 |
| H H D Bygg Og Betong AS | Voss | 2003 |
| H H D Eigedom AS | Voss | 2008 |
| H H Interiør Mur AS | Fredrikstad | 2019 |
| H H Rasmussen AS | Skien | 2005 |
| H Hadland Bygg AS | Egersund | 1997 |
| H Infra AS | Drammen | 2024 |
| H J Oftedal AS | Bryne | 2016 |
| H K S Bygg AS | Konsmo | 2010 |
| H K Sørensen AS | Finnsnes | 1987 |
| H Kvame AS | Naustdal | 1993 |
| H L Holding AS | Grimstad | 2018 |
| H L Montering Ans | Oslo | 1990 |
| H Myrabakk AS | Leksvik | 1994 |
| H O Sandberg AS | Namsos | 1967 |
| H Oen AS | Holmefjord | 2021 |
| H Og Å Eigedom AS | Skei I Jølster | 2017 |
| H Pettersen Eft Ans | Brevik | 1992 |
| H R Byggservice AS | Kragerø | 2009 |
| H S Odberg Glassmester AS | Larvik | 2003 |
| H S Odberg Glassmesterforretning Ans | Larvik | 1979 |
| H Sandvik AS | Isdalstø | 2006 |
| H Sandvik Holding AS | Isdalstø | 2005 |
| H Sæther AS | Dolmøy | 2005 |
| H Sæther VVS AS | Dolmøy | 2005 |
| H W Andersen Holding AS | Tjøme | 2005 |
| H W Blikk & Ventilasjon AS | Skiptvet | 1995 |
| H&C Anlagenmontagen GmbH | Oslo | 2026 |
| H&F Anlegg Da | Mosby | 2007 |
| H&F Maskinservice AS | Kopervik | 2023 |