| Amon Sul AS | | 2026 |
| Amor Fati AS | Information & communication | 2026 |
| Amor Fati Undertøy AS | Wholesale & retail | 2024 |
| Amora AS | Hospitality | 2026 |
| Ampen Holding AS | | 2021 |
| Amper Tone AS | Arts & recreation | 2004 |
| Ampere Holding AS | | 2026 |
| Ampero AS | Information & communication | 2026 |
| Ampersound Da | Arts & recreation | 2017 |
| Amphena AS | Professional & scientific | 2024 |
| Amphiscene AS | Administrative & support | 2021 |
| Amphitech Norge Nuf | Professional & scientific | 2008 |
| Ampi Listehuset AS | Wholesale & retail | 2015 |
| Ampla Nova AS | | 2020 |
| Amplifai AS | Information & communication | 2025 |
| Amplifai Invest AS | | 2025 |
| Amplified Holding AS | | 2023 |
| Amplifier AS | Professional & scientific | 2026 |
| Amplify Creatives AS | Administrative & support | 2019 |
| Amplify Reel Marketing AS | Professional & scientific | 2023 |
| Amplify Rights AS | | 2020 |
| Amplio Pe Storm Bidco AS | | 2026 |
| Amplio Pe Storm Topco AS | | 2026 |
| Ampvik AS | Information & communication | 2026 |
| Ampyron Technologies AS | Information & communication | 2026 |
| Amra Bygg AS | Construction | 2021 |
| Amra Eiendom AS | Real estate | 2021 |
| Amrah AS | Wholesale & retail | 2025 |
| Amrap Holding AS | Financial services | 2018 |
| Amravi Invest AS | Financial services | 2010 |
| Amring Amerikanska Ringdepoten AB | Wholesale & retail | 2019 |
| Amro Advising AS | Professional & scientific | 2018 |
| Amrop Norge AS | Administrative & support | 1986 |
| Ams Holding AS | | 2025 |
| Ams Invest AS | | 2023 |
| Ams Transport AS | Transport & logistics | 2025 |
| Amsa Capital AS | | 2026 |
| Amsons Bil AS | Wholesale & retail | 2025 |
| Amsrudveien 2-4 Eiendom AS | Real estate | 2006 |
| Amstad Eiendom AS | Real estate | 2023 |
| Amsvartnir AS | Financial services | 2017 |
| Amt AS | Real estate | 2014 |
| Amt Kommunikasjon Og Kultur AS | Professional & scientific | 2014 |
| Amt Solutions Spolka Z Ograniczona Odpowiedzialnoscia Nuf | Construction | 2021 |
| Amtc AS | Wholesale & retail | 2004 |
| Amtr AS | | 2021 |
| Amuletum AS | Professional & scientific | 2016 |
| Amulin Holding AS | Real estate | 2017 |
| Amulius AS | Administrative & support | 2012 |
| Amund Vik Consulting AS | Professional & scientific | 2023 |
| Amundsen Bad & Flis AS | Construction | 2021 |
| Amundsen Bryggeri AS | Manufacturing | 2012 |
| Amundsen Capital AS | Wholesale & retail | 2022 |
| Amundsen Gulv AS | Professional & scientific | 2021 |
| Amundsen International Ans | Wholesale & retail | 1998 |
| Amundsen Investment Management | | 2021 |
| Amundsen Og Sverdrup AS | | 2021 |
| Amundsen Oslo Holding AS | Manufacturing | 2005 |
| Amundsen Spesial Byporten AS | Wholesale & retail | 2025 |
| Amundsen Sports AS | Professional & scientific | 2010 |
| Amundsen Technology AS | Information & communication | 2025 |
| Amundsen Watches AS | Manufacturing | 2002 |
| Amundstad Invest AS | Agriculture & fishing | 2015 |
| Amv 116 AS | Real estate | 2019 |
| Amver AS | Health & social care | 2026 |
| Amwil Invest AS | | 2020 |
| AMX13 Nordic AS | Real estate | 2024 |
| Amy Holding AS | | 2018 |
| Amyr Holding AS | | 2026 |
| An Consult AS | Professional & scientific | 2024 |
| An Food AS | Wholesale & retail | 2018 |
| An Invest AS | Information & communication | 2004 |
| An Investment AS | | 2024 |
| An Maler AS | Construction | 2023 |
| Ana Holding AS | | 2022 |
| Ana Studio AS | Other services | 2022 |
| Anabolic Capital AS | Information & communication | 2024 |
| Anaco AS | Wholesale & retail | 2026 |
| Anagram Design AS | Professional & scientific | 2013 |
| Anagram Norge AS | Information & communication | 2016 |
| Anahata Furusund AS | | 2018 |
| Analog Eiendom AS | Real estate | 2021 |
| Analogue Group AS | | 2026 |
| Analys AS | | 2021 |
| Analyse & Tall SA | Professional & scientific | 2019 |
| Analysegruppen AS | Financial services | 1992 |
| Analysehuset AS | Information & communication | 2022 |
| Analysehuset Holding AS | Information & communication | 2022 |
| Analysesenteret AS | Information & communication | 1999 |
| Analysesjefene AS | Professional & scientific | 2022 |
| Analyseutvikling AS | Financial services | 2005 |
| Analysys Mason AS | Professional & scientific | 2014 |
| Analysys Mason Investment 2 AS | | 2022 |
| Analysys Mason Investment 2 Holding AS | | 2022 |
| Analysys Mason Investment 3 AS | | 2024 |
| Analysys Mason Limited | Information & communication | 2009 |
| Analysys Mason Ventures Nordic AS | | 2020 |
| Analytical Intelligent Solutions AS | Information & communication | 2019 |
| Analytika AS | Professional & scientific | 2015 |
| Analytika Ventures 7 AS | | 2016 |