| Grefsen Alle 12 a AS | Oslo | 1994 |
| Grefsen Alle 12 Holding AS | Haugesund | 2011 |
| Grefsen AS | Oslo | 1985 |
| Grefsen Boligutvikling AS | Oslo | 2016 |
| Grefsen Eiendom AS | Jessheim | 2006 |
| Grefsen Fysioterapi AS | Oslo | 2003 |
| Grefsen Invest Holding AS | Oslo | 2005 |
| Grefsen Og Torshov Eiendomsmegling AS | Oslo | 2001 |
| Grefsen Utvikling Næring 1 AS | Oslo | 2021 |
| Grefsenhus AS | Oslo | 2007 |
| Grefsenkollen Eiendom AS | Oslo | 2015 |
| Grefsenkollveien 8 AS | Oslo | 2006 |
| Grefsenveien 105 AS | Oslo | 2025 |
| Grefsenveien 126 AS | Drammen | 2019 |
| Grefsenveien 25 Holding AS | Oslo | 2025 |
| Grefsenveien 26 Eiendom AS | Oslo | 2018 |
| Grefsenveien 28 AS | Oslo | 2021 |
| Grefsenveien 6 B AS | Oslo | 2019 |
| Grefsenveien 61 AS | Oslo | 2006 |
| Grefsenveien 64 AS | Oslo | 2021 |
| Gregars Veg 90 AS | Bø I Telemark | 2018 |
| Greger Eiendom AS | Tromsø | 2011 |
| Greger Holding AS | Tynset | 2005 |
| Greger-Pettersen AS | Kleppstad | 2013 |
| Gregers Kvartal Næring AS | Oslo | 2024 |
| Gregersen Eiendommer AS | Horten | 1986 |
| Gregersen Industriemballasje AS | Holmestrand | 1980 |
| Gregor AS | Stavanger | 2005 |
| Gregor Eiendom AS | Skien | 2012 |
| Gregorius Eiendom AS | Skien | 2011 |
| Gregus Eiendom AS | Trondheim | 2009 |
| Gregus Gate 12 Hjelpeselskap AS | Trondheim | 2025 |
| Gregus Invest AS | Trondheim | 1983 |
| Greibesland Eiendom Da | Øvrebø | 2004 |
| Greibesland Holding AS | Mandal | 2018 |
| Greie Gutter AS | Finnsnes | 2025 |
| Greimelt AS | Kinsarvik | 2014 |
| Grein AS | Høvik | 2018 |
| Greiner & Utvik Holding AS | Tessanden | 2025 |
| Greinevegen Da | Rysstad | 2005 |
| Greinna Invest AS | Trondheim | 2021 |
| Greipa AS | Eidsnes | 2007 |
| Greipstad Eiendom AS | Søgne | 2020 |
| Greipstadgruppen AS | Kristiansand S | 2021 |
| Greis AS | Mathopen | 2005 |
| Grejar AS | Oslo | 2011 |
| Greko Eiendom AS | Bryne | 1986 |
| Grelland Eiendom AS | Holmestrand | 2001 |
| Gremo Eiendom AS | Orkanger | 2023 |
| Grenaderveien 2 AS | Skollenborg | 2022 |
| Grenaker Holding AS | Eidsvoll Verk | 2017 |
| Grenda Eiendom AS | Meldal | 2001 |
| Grendahl Holding AS | Oslo | 2022 |
| Grendahl Kapital AS | Oslo | 2022 |
| Grendahuset Framtun SA | Hellevik I Fjaler | 2021 |
| Grendahuset Heimhug SA | Volda | 1984 |
| Grendahuset Riska Ba | Hommersåk | 1984 |
| Grendahuset Ulvedal SA | Bergen | 1983 |
| Grendahuset Vonheim SA | Seim | 1979 |
| Grendal Eiendom AS | Hegra | 2005 |
| Grendals Gate 7 AS | Frei | 2024 |
| Grendehuset Fjordvang SA | Gran | 1984 |
| Grendene AS | Oslo | 1990 |
| Grendevegen Sveumvegen SA | Dokka | 2022 |
| Grendstuggu SA | Gåsbakken | 1995 |
| Grendstøl Industribygg AS | Tvedestrand | 1987 |
| Grenen AS | Paradis | 2006 |
| Greni Østre AS | Vormsund | 1999 |
| Grenir AS | Skien | 1965 |
| Grenland Arena AS | Skien | 2006 |
| Grenland Billakkering Eiendom AS | Porsgrunn | 2007 |
| Grenland Development AS | Porsgrunn | 2016 |
| Grenland Eiendom AS | Oslo | 2021 |
| Grenland Eiendomsmegling AS | Stathelle | 2005 |
| Grenland Eiendomsservice Da | Skien | 1999 |
| Grenland Handelspark AS | Hønefoss | 2015 |
| Grenland Handelspark Utvikling AS | Hønefoss | 2020 |
| Grenland Helsepark AS | Porsgrunn | 2021 |
| Grenland Helsesenter AS | Porsgrunn | 2015 |
| Grenland Investeringsselskap AS | Skien | 2024 |
| Grenland Konferansesenter AS | Stathelle | 2011 |
| Grenland Kontoreiendom AS | Porsgrunn | 2021 |
| Grenland Lagerutleie AS | Porsgrunn | 2025 |
| Grenland Leilighetshotell AS | Porsgrunn | 2012 |
| Grenland Logistikk Invest AS | Oslo | 2021 |
| Grenland Logistikkpark AS | Porsgrunn | 2003 |
| Grenland Minilager AS | Stathelle | 2007 |
| Grenland Næringspark AS | Skien | 1986 |
| Grenland Næringsutleie AS | Langhus | 2024 |
| Grenland Senteret AS | Larvik | 2015 |
| Grenland Utvikling AS | Skien | 2012 |
| Grenlandsporten 1 AS | Oslo | 2021 |
| Grenlandsporten AS | Langangen | 2020 |
| Grenmar Eiendomsforvaltning AS | Kristiansand S | 2009 |
| Grenmar Utvikling AS | Oslo | 2007 |
| Grenselunden Næring AS | Oslo | 2016 |
| Grensen 10 AS | Oslo | 2014 |
| Grensen 12 AS | Oslo | 1928 |
| Grensen 12B AS | Oslo | 1993 |
| Grensen 13 AS | Trondheim | 2021 |