| Amplo Invest AS | Financial services | 2015 |
| Amstell Invest AS | | 2023 |
| Amundsgård Holding AS | Real estate | 2013 |
| Amunova AS | Information & communication | 2026 |
| Amygdala Capital AS | | 2019 |
| An Nam AS | Hospitality | 2024 |
| Anaheim AS | Professional & scientific | 2011 |
| Anasmo AS | Real estate | 2014 |
| Anastomosis AS | Professional & scientific | 2012 |
| Anavyssos AS | | 2023 |
| Anb Holding AS | | 2021 |
| Anda Holding AS | Real estate | 2005 |
| Andeby Invest AS | | 2022 |
| Anders Askeland Holding AS | Financial services | 2005 |
| Anders Dirdal Holding AS | | 2023 |
| Anders Stensli Holding AS | Financial services | 2016 |
| Anders Tveit AS | | 2019 |
| Andersen Enterprises AS | | 2025 |
| Andreas Røste Rabanal Holding AS | Health & social care | 2024 |
| Andremex AS | | 2026 |
| Andrevind AS | | 2018 |
| Andre`S Invest AS | Real estate | 2025 |
| Andromeda AS | Education | 2017 |
| Andvar AS | Professional & scientific | 2021 |
| Andy Bygg Og Anlegg AS | Construction | 2015 |
| Ane SR Holding AS | Real estate | 2024 |
| Anea Holding AS | Financial services | 2011 |
| Anecon AS | Professional & scientific | 2019 |
| Aneela & Khalid Holding AS | | 2021 |
| Anette Hovland AS | Professional & scientific | 2022 |
| Anette Moi AS | Professional & scientific | 2020 |
| Anfinn Østvoll AS | Real estate | 1972 |
| Angel Consulting AS | Information & communication | 2019 |
| Angel Dameklær AS | Wholesale & retail | 2020 |
| Angr Invest AS | | 2021 |
| Anika Invest AS | | 2025 |
| Animera AS | Information & communication | 2016 |
| Anita Wiig AS | Health & social care | 2025 |
| Anker Eiendom AS | Real estate | 2003 |
| Ankerbygget AS | Real estate | 1956 |
| Ankeret Eiendom AS | Real estate | 2024 |
| Ankerhaugen AS | Construction | 2012 |
| Ankerkvartalet Holding AS | Real estate | 2017 |
| Ankor AS | Information & communication | 2024 |
| Ankva AS | | 2024 |
| Anleggsgartneren.No Da | Administrative & support | 2010 |
| Anna Malena AS | Wholesale & retail | 2010 |
| Anne Bie Holding AS | Real estate | 2021 |
| Anne Guri Ellingsen AS | Financial services | 2023 |
| Anne-Lise Svandalsflona AS | Financial services | 2017 |
| Anni Holding AS | | 2021 |
| Annietime AS | Professional & scientific | 2025 |
| Anniie Holding AS | | 2018 |
| Anola Geo AS | Professional & scientific | 2021 |
| Anoor AS | Education | 2022 |
| Another Idea Holding AS | Professional & scientific | 2022 |
| Ans Kirkegt 27 | Real estate | 1990 |
| Ans Kreoline | | 1986 |
| ANS Lagerveien 25 | Real estate | 1987 |
| Ans Norrøn Møbeldesign | | 1991 |
| Ans Sportique | Wholesale & retail | 1987 |
| Ans Stavodd | Transport & logistics | 1982 |
| Ans Torodd | | 1991 |
| Ansett AS | Administrative & support | 2020 |
| Anstein Endresen AS | Real estate | 1987 |
| Ant Neptun Holding AS | Professional & scientific | 2023 |
| Anti-Gravity AS | Real estate | 2020 |
| Anvelée AS | Wholesale & retail | 2026 |
| Anvi Invest AS | | 2026 |
| Anyvabygg AS | Construction | 2019 |
| Aohm Invest AS | Real estate | 2021 |
| Apart AS | Real estate | 2023 |
| Apart Stavanger AS | Real estate | 2023 |
| Apc - Advanced Project Consulting AS | Professional & scientific | 2014 |
| Apex Technologies AS | Administrative & support | 2025 |
| Apollo X AS | Professional & scientific | 2022 |
| Apos Invest AS | Real estate | 2019 |
| Apotek 1 Bjergsted AS | Wholesale & retail | 2020 |
| Applikativ AS | Information & communication | 2015 |
| Apply AS | Mining & quarrying | 1981 |
| Applyequip Nuf | Professional & scientific | 2022 |
| Apptrra Global AS | Professional & scientific | 2015 |
| Apr Lager AS | Transport & logistics | 2008 |
| Apricity AS | Information & communication | 2024 |
| Aprimo Rådgivning Tore Soltveit AS | Professional & scientific | 2024 |
| Apriori AS | Real estate | 2005 |
| Apt. 13 AS | Other services | 2022 |
| Aquaheat AS | Professional & scientific | 2023 |
| Aquamadal AS | Professional & scientific | 2020 |
| Aquamarine Prosjekt AS | Financial services | 2004 |
| Aquanext AS | Administrative & support | 2022 |
| Aquantum Leap AS | Professional & scientific | 2017 |
| Aquareg AS | Information & communication | 2022 |
| Aquaticode Norway AS | Manufacturing | 2023 |
| Aquatrail AS | Administrative & support | 2025 |
| Aquilazenith AS | | 2024 |
| Ar Bygg Og Eiendom AS | Construction | 2025 |
| Ar-Kan AS | | 2018 |
| Arams Frisør AS | Other services | 2019 |
| Ararat AS | Professional & scientific | 2007 |