| Archipelago Holding AS | | 2026 |
| Archipelago Holdings AS | | 2021 |
| Archisecture AS | Information & communication | 2022 |
| Architaip AS | Professional & scientific | 2024 |
| Architect Aage Myhre AS | Professional & scientific | 2005 |
| Architectopia AS | Professional & scientific | 2012 |
| Archithea AS | Real estate | 2017 |
| Archon AS | Professional & scientific | 2021 |
| Archon Holding AS | Professional & scientific | 2020 |
| Archon I AS | Professional & scientific | 2018 |
| Archus Arkitekter AS | Professional & scientific | 1987 |
| Arcin AS | Real estate | 1998 |
| Arcipel AS | Real estate | 1994 |
| Arcis Holding AS | Professional & scientific | 2026 |
| Arcko Invest AS | Real estate | 2022 |
| Arcline AS | Information & communication | 2023 |
| Arcline Holding AS | | 2025 |
| Arcon AS | Wholesale & retail | 1946 |
| Arcon Eiendom AS | Real estate | 2024 |
| Arcon Entreprenør AS | Construction | 2020 |
| Arcon Gruppen AS | Construction | 2024 |
| Arcon Holding AS | | 2025 |
| Arcon Tømrer Og Eiendomsservice AS | Construction | 2023 |
| Arcoral Pharma AS | Professional & scientific | 2011 |
| Arct AS | Professional & scientific | 2014 |
| Arctan Consulting AS | Information & communication | 2020 |
| Arctan Holding AS | Professional & scientific | 1998 |
| Arctan Invest AS | Information & communication | 2020 |
| Arctan Wines AS | Wholesale & retail | 2023 |
| Arctech Robotics AS | Information & communication | 2024 |
| Arctern Ventures Norway Nuf | | 2020 |
| Arctex Norway Ans | Wholesale & retail | 1990 |
| Arctic AI AS | Information & communication | 2024 |
| Arctic Alternative Investments AS | Financial services | 2018 |
| Arctic AS | Financial services | 1993 |
| Arctic Asset Management AS | Financial services | 2010 |
| Arctic Bloom AS | Real estate | 2005 |
| Arctic Blue Boats AS | Wholesale & retail | 2005 |
| Arctic Blue Company AS | Wholesale & retail | 2007 |
| Arctic Bolig AS | Construction | 2013 |
| Arctic Brands AS | Wholesale & retail | 2024 |
| Arctic Brother Capital AS | Professional & scientific | 2014 |
| Arctic Buying Group AS | Professional & scientific | 2024 |
| Arctic Capital AS | Financial services | 2013 |
| Arctic Circle Hospitality Invest AS | Professional & scientific | 2017 |
| Arctic Cognitum AS | Information & communication | 2026 |
| Arctic Coliving AS | Hospitality | 2026 |
| Arctic Consulting AS | Professional & scientific | 2024 |
| Arctic Core AS | Information & communication | 2018 |
| Arctic Development Partners FNV2 AS | | 2018 |
| Arctic Development Partners G99 AS | Real estate | 2017 |
| Arctic Digital AS | Professional & scientific | 2016 |
| Arctic Edge Holding AS | Wholesale & retail | 2021 |
| Arctic Edge Norway AS | Wholesale & retail | 2021 |
| Arctic Employer AS | Administrative & support | 2018 |
| Arctic Export Management AS | Professional & scientific | 2025 |
| Arctic Express Line AS | Transport & logistics | 2009 |
| Arctic Golf Challenge AS | Administrative & support | 2024 |
| Arctic Green Development AS | Professional & scientific | 2018 |
| Arctic Group International AS | Professional & scientific | 1991 |
| Arctic Group Maritime AS | Wholesale & retail | 1990 |
| Arctic Holdings AS | Financial services | 2008 |
| Arctic Investment Holding AS | Professional & scientific | 2019 |
| Arctic Klima AS | Construction | 2025 |
| Arctic Knowledge AS | Professional & scientific | 2017 |
| Arctic Minerals Management AS | Professional & scientific | 2016 |
| Arctic Offshore International AS | Transport & logistics | 2009 |
| Arctic Offshore Rig AS | Transport & logistics | 2020 |
| Arctic Ortus AS | | 2012 |
| Arctic Paper Norge AS | Wholesale & retail | 1939 |
| Arctic Partners AS | Financial services | 2007 |
| Arctic Peak Capital AS | Information & communication | 2026 |
| Arctic Pharma AS | Professional & scientific | 2012 |
| Arctic Property AS | Real estate | 2012 |
| Arctic Prosjekt 108 AS | Real estate | 2018 |
| Arctic Prosjekt 163 AS | Real estate | 2019 |
| Arctic Prosjekt 171 AS | | 2019 |
| Arctic Prosjekt 181 AS | | 2020 |
| Arctic Prosjekt 183 AS | | 2020 |
| Arctic Prosjekt 186 AS | | 2020 |
| Arctic Prosjekt 187 AS | | 2020 |
| Arctic Prosjekt 191 AS | | 2021 |
| Arctic Prosjekt 195 AS | | 2021 |
| Arctic Prosjekt 197 AS | | 2021 |
| Arctic Prosjekt 199 AS | | 2021 |
| Arctic Prosjekt 200 AS | | 2021 |
| Arctic Prosjekt 201 AS | | 2021 |
| Arctic Prosjekt 202 AS | | 2021 |
| Arctic Prosjekt 203 AS | | 2021 |
| Arctic Prosjekt 205 AS | | 2021 |
| Arctic Prosjekt 207 AS | | 2021 |
| Arctic Prosjekt 209 AS | | 2021 |
| Arctic Prosjekt 211 AS | | 2021 |
| Arctic Prosjekt 212 AS | | 2021 |
| Arctic Prosjekt 213 AS | | 2021 |
| Arctic Prosjekt 214 AS | Financial services | 2021 |
| Arctic Prosjekt 215 AS | | 2021 |
| Arctic Prosjekt 216 AS | | 2021 |
| Arctic Prosjekt 217 AS | | 2021 |
| Arctic Prosjekt 218 AS | | 2021 |