| Argus Bedrift AS | Oslo | 2016 |
| Argus Bygg Og Entreprenør AS | Oslo | 2006 |
| Argus Vakt Og Alarm Da | Drøbak | 1993 |
| Arh Maskin AS | Nordkjosbotn | 2021 |
| Arhaug AS | Fosnavåg | 2016 |
| Arhaug AS | Fosnavåg | 2026 |
| Arhaus Pro Bygg AS | Drammen | 2021 |
| Ari & Usko Byggtjeneste AS | Oslo | 1996 |
| Ari Eiendom AS | Skien | 2014 |
| Ari's AS | Lommedalen | 2005 |
| Arian Nova Handelsbolaget | Se-124 31 Bandhagen | 2012 |
| Arie Van Duijn AS | Skjomen | 2022 |
| Arifi Holding AS | Odda | 2023 |
| Arifi Vedlikehold AS | Odda | 2023 |
| Arigato Bygg AS | Oslo | 2016 |
| Arild Aase Takst Og Maling AS | Nesttun | 2023 |
| Arild Andersen Elektro AS | Larvik | 1994 |
| Arild Arntsen AS | Lavik | 2016 |
| Arild Byberg AS | Voll | 1998 |
| Arild Gudmundsen AS | Veggli | 2021 |
| Arild Kolstad A/S | Askim | 1987 |
| Arild Moe Transport Og Graveservice AS | Langhus | 2005 |
| Arild Mosbæk AS | Mysen | 2012 |
| Arild Nordheim Entreprenør AS | Vinje | 2019 |
| Arild Tørresen AS | Hornnes | 2014 |
| Arilds Allteknik Nuf | Se-66 434 Grums | 2007 |
| Arilds Betongslipping AB | Se-664 32 Grums | 2020 |
| Arildsen Rørleggerservice AS | Fyllingsdalen | 2012 |
| Arios AS | Rådal | 2007 |
| Arista AS | Kvernaland | 2017 |
| Aritech AS | Stord | 2001 |
| Aritech Bergen AS | Bergen | 2020 |
| Aritech Invest AS | Stord | 2021 |
| Arituba Spa Center Construtora E Incorporadora Ltda | 59.164-000 Nisia Floresta/Rn | 2008 |
| Arjo Entreprenør AS | Melhus | 2020 |
| Ark Bolig AS | Ræge | 2015 |
| Ark Bygg Og Flis AS | Stathelle | 2022 |
| Ark Bygg Og Interiør AS | Lillehammer | 2014 |
| Arka Bygg AS | Lier | 2005 |
| Arkadiusz Blazejewio Bo | 84-240 Reda | 2007 |
| Arkadiusz Kricielewski Landark Bygningshåndverker | 80-547 Gdynia | 2005 |
| Arkadiusz Palasz Palasz Marine Projekt | Pl-81-601 Gdynia | 2015 |
| Arkadiusz Ryduchowski Arplast | 84-242 Luzino | 2006 |
| Arkadiusz Witkowski Bud | 81-218 Gdynia | 2007 |
| Arkadiusz Wojtas Wojt | 82-310 Elblag | 2006 |
| Arkel Asker Og Bærum AS | Hvalstad | 1989 |
| Arkel Innlandet AS | Brumunddal | 2005 |
| Arkel Oslo AS | Oslo | 2002 |
| Arkel Romerike AS | Rælingen | 2002 |
| Arken Bygg AS | Sandefjord | 2019 |
| Arkentekas Uab | 2001 Vilnius | 2004 |
| Arket Oü Nuf | Ee-62317 Kaagvere | 2023 |
| Arkhen AS | Kleppestø | 2013 |
| Arkimedes AS | Inndyr | 2020 |
| Arkitekt Og Bygg AS | Fredrikstad | 2023 |
| Arkitektbygg AS | Hagan | 2020 |
| Arkitektbyggarna Blekinge AB | 37043 Sturkö | 2014 |
| Arkitekthus Entreprenør AS | Oslo | 2022 |
| Arko Gruppen AS | Oslo | 2026 |
| Arko Prosjekt & Service AS | Saudasjøen | 2025 |
| Arkobygg AS | Valestrandsfossen | 2016 |
| Arktek Holding AS | Jessheim | 2023 |
| Arktek VVS AS | Vestby | 2023 |
| Arktika-Elektro Bochynek Nuf | 47-150 Zalesie Slaskie | 2013 |
| Arktisk Bygg AS | Vadsø | 2017 |
| Arktisk Holding AS | Moen | 2021 |
| Arktos Håndverk AS | Svolvær | 2024 |
| Arl Byggservice AS | Jar | 2024 |
| Arma Bygg AS | Eiksmarka | 2015 |
| Arma Invest AS | Melhus | 2022 |
| Armandito AS | Skedsmokorset | 2025 |
| Armando Bygg AS | Sandefjord | 2021 |
| Armano Bygg AS | Ås | 2014 |
| Arme Denmark | Dk-6000 Kolding | 2014 |
| Armering VMS Nuf | Riga | 2015 |
| Armeringsservice AS | Sofiemyr | 1991 |
| Arna & Åsane Rørleggerservice AS | Espeland | 2005 |
| Arna Glass AS | Arnatveit | 1998 |
| Arna Gulvservice AS | Skulestadmo | 2024 |
| Arna Jordsortering AS | Haukeland | 2014 |
| Arna Mur Og Flis AS | Garnes | 2024 |
| Arna Tak AS | Valestrandsfossen | 2008 |
| Arna Vann Varme Og Sanitær AS | Espeland | 2002 |
| Arnadal Anlegg AS | Stokke | 2012 |
| Arnadal Holding AS | Stokke | 2020 |
| Arnas Tilbud AS | Halden | 2015 |
| Arnas Tilbud Bygg AS | Halden | 2026 |
| Arnas Tilbud Flis AS | Halden | 2026 |
| Arnas Tilbud Maler AS | Halden | 2026 |
| Arnavågen Bygg AS | Garnes | 2005 |
| Arnco AS | Ørsta | 1986 |
| Arne & Jens Transport AS | Tana | 1995 |
| Arne Aarbergsbotten AS | Sande I Sunnfjord | 2015 |
| Arne Bjørgo Invest AS | Bekkestua | 2021 |
| Arne Bjørnvold Holding AS | Sandnessjøen | 2021 |
| Arne Byberg AS | Sola | 1979 |
| Arne Byberg Holding Sola AS | Sola | 2013 |
| Arne Dyrkorn AS | Ørskog | 2001 |
| Arne Frode Lilleås AS | Herand | 2004 |
| Arne G AS | Stjørdal | 2021 |