| Arctic Prosjekt 221 AS | | 2022 |
| Arctic Prosjekt 222 AS | | 2022 |
| Arctic Prosjekt 223 AS | Financial services | 2022 |
| Arctic Prosjekt 224 AS | | 2022 |
| Arctic Prosjekt 225 AS | | 2022 |
| Arctic Prosjekt 226 AS | | 2022 |
| Arctic Prosjekt 227 AS | | 2022 |
| Arctic Prosjekt 230 AS | | 2022 |
| Arctic Prosjekt 231 AS | | 2022 |
| Arctic Prosjekt 232 AS | | 2022 |
| Arctic Prosjekt 233 AS | | 2022 |
| Arctic Prosjekt 234 AS | | 2022 |
| Arctic Prosjekt 236 AS | | 2022 |
| Arctic Prosjekt 237 AS | | 2022 |
| Arctic Prosjekt 238 AS | | 2022 |
| Arctic Prosjekt 61 AS | | 2016 |
| Arctic Real Estate Development AS | Real estate | 2018 |
| Arctic Real Estate Indirect I AS | Financial services | 2021 |
| Arctic Real Estate Management AS | Professional & scientific | 2010 |
| Arctic Reefers AS | Transport & logistics | 2004 |
| Arctic Research and Development AS | Professional & scientific | 2025 |
| Arctic Rights Management AS | Information & communication | 2017 |
| Arctic Saga AS | Information & communication | 2017 |
| Arctic Securities AS | Financial services | 2007 |
| Arctic Securities Holding AS | | 2014 |
| Arctic Shipping AS | Transport & logistics | 2014 |
| Arctic Sound Da | Administrative & support | 2006 |
| Arctic Supercar Collection AS | Administrative & support | 2024 |
| Arctic Supercars AS | Administrative & support | 2024 |
| Arctic Supply Management AS | Professional & scientific | 2019 |
| Arctic Sustainable AS | | 2022 |
| Arctic Swimwear AS | Wholesale & retail | 2016 |
| Arctic Treasure AS | Hospitality | 2026 |
| Arctic Wolf Networks, Inc. | Information & communication | 2022 |
| Arctic Zero AS | Wholesale & retail | 2016 |
| Arcticelvis AS | Professional & scientific | 2013 |
| Arctodus AS | Information & communication | 2011 |
| Arctos Group AS | Information & communication | 2024 |
| Arcventures AS | | 2025 |
| Ard Ventures AS | | 2026 |
| Ardem Invest AS | Professional & scientific | 2008 |
| Arden AS | | 2021 |
| Ardency Group AS | | 2026 |
| Arder Invest AS | Financial services | 2018 |
| ARDEX SKANDINAVIA Filial av utenlandsk foretak NUF | Wholesale & retail | 1995 |
| Ardil Eiendom AS | Real estate | 2015 |
| Ardoq AS | Information & communication | 2013 |
| Ardoq Holding AS | | 2024 |
| Are Almaas AS | Information & communication | 2020 |
| Are Sorknes AS | Arts & recreation | 2025 |
| Area 42 AS | Financial services | 2014 |
| Areal Boligkontroll AS | Real estate | 2024 |
| Arealer AS | Real estate | 2016 |
| Arealgruppen AS | Real estate | 2012 |
| Arealize AS | Information & communication | 2021 |
| Arealo Gruppen AS | Real estate | 2020 |
| Arealpartner Eiendomsforvaltning AS | Real estate | 2014 |
| Arealpartner Forvaltning AS | Real estate | 2017 |
| Arealpartner Næringsmegling AS | Real estate | 2014 |
| Arealsmart AS | Real estate | 2021 |
| Arealstatistikk AS | Professional & scientific | 2004 |
| Areasim Rådgivning AS | Professional & scientific | 2022 |
| Areb Holding AS | Financial services | 2009 |
| Areca Invest AS | | 2023 |
| Areco Profiles AS | Wholesale & retail | 2000 |
| Ared Invest AS | Real estate | 2017 |
| Arefberg Holding AS | | 2021 |
| Areia Consulting Holding Limited | | 2023 |
| Areia Consulting Limited | Real estate | 2022 |
| Areim AB Nuf | | 2019 |
| Areim Investment Norway 5-1 AS | Real estate | 2023 |
| Areim Storbyeiendom AS | Real estate | 2023 |
| Areka AS | | 2025 |
| Arelion Norway AS | Information & communication | 2000 |
| Arelma Invest AS | Information & communication | 2016 |
| Arelta AS | Information & communication | 2025 |
| Arena Advokat AS | Professional & scientific | 2018 |
| Arena by Schage AS | Real estate | 2007 |
| Arena Drøbak AS | | 2016 |
| Arena Malerservice AS | Construction | 2012 |
| ARENA4HEALTH AS | Health & social care | 2005 |
| Arenarena AS | Real estate | 2017 |
| Arenavask AS | Administrative & support | 2025 |
| Arenax Production AS | Information & communication | 2026 |
| Arenberg Holding AS | | 2025 |
| Arendal Eiendomsinvest AS | Real estate | 2010 |
| Arendal Holding AS | | 2026 |
| Arendal Treningeiendom AS | Real estate | 1996 |
| Arendalsgata 14 AS | Real estate | 2018 |
| Arendalsgaten 12 AS | Real estate | 1939 |
| Arendalsgaten 12 Næring AS | Real estate | 2024 |
| Arenea Web AS | Wholesale & retail | 2018 |
| Areni Winestorage Norway AS | Real estate | 2023 |
| Arenoverin AS | Construction | 2025 |
| Arentz & Amundsen AS | Wholesale & retail | 1989 |
| Areo AS | Information & communication | 2011 |
| Arep AS | Real estate | 2007 |
| Arepo AS | Professional & scientific | 2005 |
| Arepo Invest AS | Professional & scientific | 2014 |
| Ares AS | Administrative & support | 1971 |