| Arcticevent-Narvik AS | Narvik | 2019 |
| Arcticode AS | Stavanger | 2018 |
| Arcticride Safety AS | Åseral | 2024 |
| Arcticwild.No AS | Kvaløya | 2018 |
| Arctix AS | Stavanger | 2024 |
| Arctos Travel AS | Longyearbyen | 2025 |
| Ard Invest AS | Stord | 2005 |
| Ardilaun Aviation Limited | Swords County Dublin | 2015 |
| Ardyne Tecnologies Limited Nuf | Tananger | 2016 |
| Areal Drift AS | Fyllingsdalen | 2003 |
| Areal Drift Bergen AS | Paradis | 2025 |
| Areal Multidrift AS | Harestua | 2014 |
| Areal Renhold AS | Mo I Rana | 2024 |
| Arena Akustikk Da | Rådal | 2002 |
| Arena Midt-Norge Event AS | Fannrem | 2015 |
| Arena Querini AS | Røst | 2022 |
| Arenaproduksjon Ans | Sjetnemarka | 1999 |
| Arenaprojekt I Sverige AB | Se-216 17 Limhamn | 2010 |
| Arenas AS | Sarpsborg | 2020 |
| Arenavask AS | Oslo | 2025 |
| Arendal Bedriftsrenhold AS | Arendal | 2024 |
| Arendal Bilutleie AS | Arendal | 2007 |
| Arendal Brøyteservice AS | Kongshavn | 2022 |
| Arendal by TSR 2029 AS | Arendal | 2026 |
| Arendal Festival Supply AS | Arendal | 2007 |
| Arendal Utleie AS | Arendal | 2016 |
| Arentz Og Munkeby Anleggsgartneri AS | Åsen | 1987 |
| Ares AS | Oslo | 1971 |
| Argo Arbeid AS | Karmsund | 2022 |
| Argona AS | Duken | 2026 |
| Arhol AS | Notodden | 2022 |
| Ari Beute Anleggsgartner AS | Oslo | 2022 |
| Aricent Technologies (Holdings) Limited | 122015 Haryana | 2012 |
| Aries Packaging | Fr-10430 Rosières-Prés-Troyes | 2023 |
| Ariix Europe BV | 2517Jk'S-Gravenhage | 2023 |
| Arild Bogstrand Holding AS | Evenskjer | 2012 |
| Arild Hansens Vaktmestertjeneste AS | Harstad | 2013 |
| Arinno AS | Varangerbotn | 2017 |
| Arisona C&C Ans | Oslo | 2000 |
| Arisone Medic International | 262 21 Ängelholm | 2010 |
| Aristata Limited | Cy-3040 Limassol | 2022 |
| Arjems Ans | Trondheim | 1999 |
| Ark Hage Og Vedlikehold AS | Lillesand | 2021 |
| Arkadia Ans | Moss | 2002 |
| Arkas AS | Sandefjord | 2006 |
| Arken Teater Ans | Oslo | 1990 |
| Arkimedes Adventure AS | Fauske | 2024 |
| Arkiv- Og Samlingstjenester AS | Trondheim | 2021 |
| Arkt AS | Tertnes | 2017 |
| Arktisk Feltservice AS | Longyearbyen | 2022 |
| Arktisk Horisont AS | Berlevåg | 2013 |
| Arktisk Marin AS | Tromsø | 1989 |
| Arktix Dialog AS | Harstad | 2026 |
| Arktix Maritime AS | Borkenes | 2026 |
| Arla Foods Amba | Dk-8260 Viby J | 2011 |
| Armeringssenteret AS | Vettre | 2010 |
| Armfield Offshore PCS Limited | Norfolk Nr8 5Ey England | 2019 |
| Armi Holding AS | Brumunddal | 2024 |
| Arn Narvik AS | Narvik | 2015 |
| Arne Aas AS | Ås | 2022 |
| Arne Kristoffer Ystgård AS | Inderøy | 2018 |
| Arne Tiller AS | Fjerdingby | 2018 |
| Arnemoen Gard AS | Ringebu | 2019 |
| Arnes Bilutleie AS | Sortland | 1983 |
| Arnesen Og Sønn AS | Årland | 2022 |
| Arnesen Utleieservice AS | Alta | 2020 |
| Arnesen-Invest AS | Halden | 2012 |
| Arnestad&Co AS | Solbergelva | 2025 |
| Arnfinn Johansen Wildlife Photography AS | Lillehammer | 2018 |
| Arnfinn, Kai, Tom Arrangement Service Da | Steinsholt | 1998 |
| Arnosta Nuf | Tønsberg | 2024 |
| Arnt Myrvoll AS | Oslo | 1998 |
| Arntsen Eiendomservice AS | Greåker | 2019 |
| Aro Multiservice AS | Tromsø | 2021 |
| Aron Strand AS | Alta | 2022 |
| Aronsson Dyk & Byggtjänster AB | Se-881 92 Solefteå | 2018 |
| Aroway AS | Overhalla | 2021 |
| Arpi Holding AS | Asker | 2000 |
| Arran AS | Kautokeino | 2023 |
| Arrangementsikring Da | Oslo | 1998 |
| Arrangøren AS | Rådal | 2014 |
| Arrco AS | Brumunddal | 2006 |
| Arriva AS | Storebø | 1988 |
| Arrk AS | Tønsberg | 2019 |
| Arrow Chemicals | Oslo | 1995 |
| Arrow NDT & Consultancy Limited | Newburg Ab41 6Bd Scotland | 2021 |
| Art Connections Ans | Kristiansand S | 2006 |
| Art Driven Group AS | Oslo | 2023 |
| Art Products AS | Oslo | 2020 |
| Art Stein AS | Oslo | 2025 |
| Art Trading AS | Vøyenenga | 2003 |
| Art Travel AS | Drammen | 1998 |
| Art-Engineering LLC | Us-48465 Palms, Mi | 2014 |
| Arta Renhold Og Service AS | Kristiansand S | 2025 |
| Artaius AS | Longyearbyen | 2022 |
| Arteco AS | Ålesund | 1989 |
| Artemes AS | Stavanger | 2021 |
| Artemes Group AS | Stavanger | 2015 |
| Artemis Search & Selection AS | Stavanger | 2019 |
| Arthur 2 Ltd SP. Z O.O. | Pl-80-863 Gdansk | 2026 |