| Arag Digital Services AS | Financial services | 2017 |
| Arag Nordic AS | Financial services | 2017 |
| Aragon Invest AS | Real estate | 2004 |
| Aragorn AS | Financial services | 2012 |
| Aragorn Eiendom AS | Real estate | 1996 |
| Aragorn Finans AS | Administrative & support | 2018 |
| Arai AS | Information & communication | 2025 |
| Arakataka AS | Hospitality | 2000 |
| Arakataka Lærlingbedrift AS | Education | 2023 |
| Aralden Eiendom AS | Real estate | 2020 |
| Aralden Maritime AS | Wholesale & retail | 2003 |
| Aramco Ventures Limited Nuf | Professional & scientific | 2014 |
| Aramian AS | | 2024 |
| Aramini Holding AS | | 2026 |
| Aramis Capital AS | | 2017 |
| Aramis Investment AS | | 2020 |
| Aramso Invest AS | Real estate | 1983 |
| Aran Prosjekter Limited | Real estate | 2020 |
| Aranda Holding AS | | 2024 |
| Arandia Service & Vedlikehold Da | Administrative & support | 2005 |
| Arano AS | | 2025 |
| Aranyani Film AS | Information & communication | 2017 |
| Aranykorona AS | | 2025 |
| Aras Pizzaria AS | Hospitality | 2023 |
| Arash Consulting AS | Information & communication | 2023 |
| Arat AS | Real estate | 1996 |
| Arb Økonomi AS | Professional & scientific | 2016 |
| Arba Kit AS | Professional & scientific | 2014 |
| Arbaflame AS | Wholesale & retail | 2005 |
| Arbak Holding AS | Real estate | 2005 |
| Arbakkinn AS | Professional & scientific | 2013 |
| Arbeiderboligene Vest AS | Real estate | 2024 |
| Arbeidergata 4 AS | Real estate | 2019 |
| Arbeidergata Restaurantdrift AS | Hospitality | 2008 |
| Arbeidergaten 2 Da | Real estate | 1994 |
| Arbeids- Og Bosamvirket Vestbredden Vell Vell Kom Si Kom SA | Real estate | 2005 |
| Arbeidsark AS | Information & communication | 2020 |
| Arbeidsfelleskapet Løkkaskogen 19 Da | Real estate | 2011 |
| Arbeidsgruppa Ny Von SA | Professional & scientific | 2023 |
| Arbeidsklar AS | Administrative & support | 2026 |
| Arbeidsklinikken AS | Health & social care | 2013 |
| Arbeidslaget AS | Education | 2019 |
| Arbeidslivsressurs AS | Health & social care | 2017 |
| Arbeidsmandsforbundets Hus AS | Real estate | 2007 |
| Arbeidsmiljøhuset AS | Health & social care | 2017 |
| Arbeidsstyrke AS | Health & social care | 2025 |
| Arbil Eiendom AS | Real estate | 2013 |
| Arbins Gate 1 AS | Real estate | 1936 |
| Arbins Gate 11 AS | Real estate | 2015 |
| Arbinsgate 2 AS | Real estate | 2016 |
| Arbinsgate 3 AS | Real estate | 2009 |
| Arbion Industries AS | Professional & scientific | 2021 |
| Arbitrium AS | Professional & scientific | 2012 |
| Arbonsen Holding AS | | 2026 |
| Arbora AS | Professional & scientific | 2006 |
| Arbos Partners AS | Construction | 1996 |
| Arbosgate Kolonial AS | Wholesale & retail | 2018 |
| Arc International | Wholesale & retail | 1995 |
| Arc Invest AS | | 2021 |
| Arc Labs AS | Information & communication | 2026 |
| Arc Studios AS | Real estate | 2014 |
| Arca AS | Health & social care | 2003 |
| Arcade Travel AS | Administrative & support | 2012 |
| Arcade Wines 2 You AS | Wholesale & retail | 2024 |
| Arcade Wines 4 You AS | Wholesale & retail | 2024 |
| Arcade Wines AS | Wholesale & retail | 2023 |
| Arcadeify AS | Arts & recreation | 2021 |
| Arcadia Research AS | Professional & scientific | 2016 |
| Arcane AS | Information & communication | 1987 |
| Arcanum Eiendom AS | Real estate | 2007 |
| Arcanum Investment AS | Real estate | 2020 |
| Arce Générale AS | Financial services | 2021 |
| Arcelormittal Commercial Long Norway AS | Wholesale & retail | 2002 |
| Arcem AS | Real estate | 2024 |
| Arcem DC 11 AS | Real estate | 2024 |
| Arcem DC 13 AS | Real estate | 2025 |
| Arcem DC 14 AS | Real estate | 2025 |
| Arcem DC 15 AS | Real estate | 2025 |
| Arcem GO-DC2 AS | Real estate | 2016 |
| Arcem Holdco AS | Information & communication | 2025 |
| Arcem Langedalen AS | Real estate | 2025 |
| Arcem Sa-Dc AS | Real estate | 2022 |
| Arcem SI-DC4 AS | Real estate | 2015 |
| Arcem SK-DC1 AS | Real estate | 2022 |
| Arcengine AS | Real estate | 2025 |
| Arcgl Invest AS | Professional & scientific | 2024 |
| Arch Holding AS | Professional & scientific | 2017 |
| ARCH2 SA | Professional & scientific | 2019 |
| Archaios AS | Information & communication | 2026 |
| Archer Dental AS | Health & social care | 2021 |
| Archertech Da | Information & communication | 2025 |
| Archi Bygg AS | Professional & scientific | 2015 |
| Archi Systems AS | Professional & scientific | 2016 |
| Archi-Plan AS | Professional & scientific | 2012 |
| Archibald AS | | 2026 |
| Archibald Drift AS | Information & communication | 2026 |
| Archie Knows AS | Information & communication | 2025 |
| Archigram Ans | Professional & scientific | 2004 |
| Archimatika Norge AS | Professional & scientific | 2019 |
| Archipelago AS | | 2023 |