| John Bjørgan AS | Kvål | 1982 |
| John Fadum AS | Sem | 1971 |
| John Fadum Eiendom AS | Sem | 2008 |
| John Fadum Holding AS | Sem | 2005 |
| John Galten AS | Rena | 2001 |
| John Haugvaldstad AS | Stavanger | 1988 |
| John Holvik AS | Førde | 1997 |
| John Hæhre AS | Vikersund | 2016 |
| John Johnsen AS | Rena | 2012 |
| John Kildal & Sønner AS | Engavågen | 2004 |
| John Kleveland AS | Skien | 1987 |
| John Lien Rørleggerbedrift AS | Ringebu | 1983 |
| John Martinsen Bygg AS | Stokmarknes | 2000 |
| John Reinfjord AS | Sømna | 1993 |
| John S Jacobsen AS | Stabbestad | 1994 |
| John Sagmo AS | Trones | 2000 |
| John Wiggen AS | Viggja | 2017 |
| John's Mur Og Graveservice AS | Hvam | 2001 |
| Johnny Jensen AS | Kragerø | 1986 |
| Johnny Johansen AS | Leknes | 2021 |
| Johnny Larsen AS | Mosjøen | 1995 |
| Johnny Lyngbø Malerfirma AS | Rådal | 2007 |
| Johnny Nilsen Invest AS | Veavågen | 2020 |
| Johnny Vold AS | Vigrestad | 2008 |
| Johnsen & Abelsen Maskinentreprenør Ans | Bodø | 2000 |
| Johnsen & Enger Byggservice AS | Hokksund | 2022 |
| Johnsen & Enger Holding AS | Hokksund | 2019 |
| Johnsen & Jensen AS | Sandnes | 1996 |
| Johnsen & Jensen Eiendom AS | Sandnes | 2005 |
| Johnsen & Skarsvåg Malerservice AS | Kolltveit | 2024 |
| Johnsen & Stovner AS | Hakadal | 1979 |
| Johnsen Asfalt AS | Kleppe | 1986 |
| Johnsen Bygg AS | Sømna | 2025 |
| Johnsen Drift AS | Rolvsøy | 2024 |
| Johnsen El-Installasjon AS | Skiptvet | 2020 |
| Johnsen Maskinservice AS | Sørreisa | 2012 |
| Johnsen Mur Og Flis AS | Krokkleiva | 2020 |
| Johnsen Rørservice AS | Bønes | 2016 |
| Johnson Controls Deutschland GmbH | De-40880 Ratingen | 2024 |
| Johnsrud Anleggsdrift AS | Svelvik | 2009 |
| Johnsrud AS | Tranby | 2024 |
| Johnsrud Rør AS | Hønefoss | 2024 |
| Johnstad Maskin AS | Skulestadmo | 2012 |
| Johntor Maskiner AS | Fredrikstad | 2010 |
| Johs Bjerke Elektro Da | Oslo | 1988 |
| Johs E Øvsthus AS | Skulestadmo | 1997 |
| Johs J Syltern AS | Åfjord | 1980 |
| Johs Thords Graveservice Da | Tisleidalen | 2008 |
| Johs. Røgelstad Maskin AS | Skånevik | 2006 |
| Johtex AS | Mandal | 2020 |
| Johto AS | Hesseng | 2017 |
| Join Invest AS | Oslo | 2009 |
| Jokelid Bygg AS | Evje | 2019 |
| Jokerhus Bygg AS | Stavanger | 1995 |
| Jokon Holding AS | Gressvik | 2012 |
| Jokstad Elektro AS | Prestfoss | 2017 |
| Jolly Bob AS | Holmestrand | 2022 |
| Jome Entreprenør AS | Foldereid | 2012 |
| Jome Invest AS | Stathelle | 2016 |
| Jomet OY | Fi-30100 Forssa | 2019 |
| Jon Arne Langørgen AS | Heimdal | 2014 |
| Jon Dahle Bygg AS | Gjerdrum | 1998 |
| Jon Georg Lindal AS | Tvedestrand | 2021 |
| Jon Haugland Bygg AS | Heggedal | 2020 |
| Jon L Sæter AS | Sunndalsøra | 1995 |
| Jon Lennart Invest AS | Verdal | 2005 |
| Jon Olav Vuttudal Holding AS | Fannrem | 2016 |
| Jon Strand AS | Sør-Fron | 2002 |
| Jon Strømsnes AS | Florø | 1986 |
| Jon Ståle Nesheim Maskin AS | Skjold | 2014 |
| Jon Sæter AS | Kristiansund N | 1978 |
| Jon's Bygg Og Takst AS | Lom | 2019 |
| Jona Johansson AS | Alta | 2024 |
| Jonam AS | Moss | 2014 |
| Jonas & Lars El & Montage AB | Moss | 2004 |
| Jonas & Magnus Bygg Ans | Oslo | 2001 |
| Jonas Brynhildsen AS | Skien | 2013 |
| Jonas Sandsten Consulting AB | 23434 Lomma | 2013 |
| Jonas Svensson | 591 97 Motala | 2005 |
| Jonas Vinduer Byggetjenester AS | Sandnes | 2018 |
| Jonasbygg AS | Lakselv | 2020 |
| Jonasbygg.No AS | Hokksund | 2021 |
| Jonassen Bygg & Maskin AS | Burfjord | 2013 |
| Jonassen Byggtjenester AS | Sandnes | 2016 |
| Jonassen Og Amundsen Bygg Da | Namsos | 1993 |
| Jonassen Rørservice AS | Rypefjord | 2001 |
| Jonassen VVS AS | Krokstadelva | 2025 |
| Jonbekk Elektro AS | Oslo | 2021 |
| Jondal Maskin & Transport AS | Kysnesstrand | 2013 |
| Jondal Rørleggerservice & Eigendom AS | Geilo | 2013 |
| Jondalen Holding AS | Kongsberg | 2024 |
| Jones Hyttegrend AS | Førde | 2018 |
| Jongård Invest AS | Ridabu | 2023 |
| Jonika Holding AS | Molde | 2014 |
| Jonnes Blikk Og Eiendom AS | Heimdal | 2023 |
| Jonny AS | Skånevik | 2023 |
| Jonny Axelsson | 570 76 Ruda | 2014 |
| Jonny Helge Atterås AS | Hyllestad | 2018 |
| Jonny Invest AS | Skånevik | 2023 |
| Jonny Larsen Rørleggerbedrift AS | Solbergmoen | 1998 |