| AG Bilverksted AS | Other services | 2023 |
| Aggregat Formidlingsrom AS | Arts & recreation | 2024 |
| Agoo AS | Professional & scientific | 2024 |
| Agromatic AS | Information & communication | 1997 |
| Agy Invest AS | | 2025 |
| Ah Classic Cars AS | Other services | 2017 |
| Ahobby AS | Wholesale & retail | 2024 |
| Aicono Ålesund AS | Professional & scientific | 2023 |
| Aidency AS | Professional & scientific | 2021 |
| Aidency Technology AS | Manufacturing | 2023 |
| Aim Solutions AS | Information & communication | 2024 |
| Aipex AS | Professional & scientific | 2023 |
| Aivonova AS | Information & communication | 2024 |
| Aj Bygg AS | Construction | 2015 |
| Ajarn Moe Holding AS | | 2025 |
| Ajea Invest AS | Financial services | 2005 |
| Ajtks Invest AS | | 2021 |
| Ajv Holding AS | | 2023 |
| Akademiet Fagskole AS | Education | 2022 |
| Akademiet Halden AS | Education | 2024 |
| Akademiet International School Oslo AS | Education | 2025 |
| Akademiet Norge AS | Education | 2010 |
| Akademiet Privatskole Sandnes AS | Education | 2025 |
| Akademiet Privatskole Østfold AS | Education | 2024 |
| Akademiet Realfagsungdomsskole Ålesund AS | Education | 2017 |
| Akademiet Toppidrett Oslo AS | Education | 2025 |
| Akademiet Toppidrettsgymnas Ålesund AS | Education | 2013 |
| Akademiet VGS Christiania AS | Education | 2024 |
| Akademiet VGS Lillestrøm AS | Education | 2024 |
| Akademiet VGS Møre AS | Education | 1999 |
| Akademiet VGS Ski AS | Education | 2024 |
| Akademiet VGS Ålesund AS | Education | 2002 |
| Akadi AS | Information & communication | 2026 |
| Akerø-Daniel-Nerland Losseassistanse Ans | Transport & logistics | 1995 |
| Akh Paulsen AS | Real estate | 2015 |
| Akofa AS | Real estate | 2021 |
| Aksjeføring AS | Information & communication | 2021 |
| Aksjeselskapet Matknuten | Wholesale & retail | 1995 |
| Aksla Tannhelse AS | Health & social care | 2011 |
| Aktiebolaget Nevotex | Wholesale & retail | 2004 |
| Alary AS | Professional & scientific | 2024 |
| Albert Aarøe Holding AS | Financial services | 2005 |
| Aldri AS | Construction | 1990 |
| Aleator AS | Real estate | 2005 |
| Alfa Begravelsesbyrå AS | Other services | 2010 |
| Alfa Beta AS | Real estate | 2014 |
| Alfa Edge AS | Wholesale & retail | 2021 |
| Alfa Elektro AS | Construction | 1995 |
| Alfa Miljø AS | Wholesale & retail | 2026 |
| Alfr Nesset AS | | 1961 |
| Alfr Nesset Radio TV Service AS | Other services | 1994 |
| Alfred Nesset Automasjon AS | Construction | 2012 |
| All Crew AS | Administrative & support | 2025 |
| All Data Da | Information & communication | 1990 |
| All Norway AS | | 2025 |
| Allianse Eiendom AS | Real estate | 2016 |
| Allocean AS | Mining & quarrying | 2017 |
| Allpro AS | Wholesale & retail | 2021 |
| Allrom AS | Real estate | 2005 |
| Alma Invest AS | Real estate | 2025 |
| Almala Holding AS | | 2023 |
| Almar AS | Professional & scientific | 2025 |
| Almco AS | Real estate | 2000 |
| Almita Pro AS | | 2024 |
| Alnes Design AS | Professional & scientific | 2008 |
| Alnes Eiendom AS | | 2022 |
| Alnes Holding AS | | 2022 |
| Alnes Lodge AS | Hospitality | 2023 |
| Alone Holding AS | Transport & logistics | 2007 |
| Alotta AS | Professional & scientific | 2020 |
| Alotta Energy AS | Administrative & support | 2023 |
| Alp Invest AS | Real estate | 2014 |
| Alptor AS | Real estate | 2020 |
| Already Ordered AS | Information & communication | 2020 |
| Alstro AS | | 2023 |
| Alveo AS | Health & social care | 2017 |
| Alvika Massedeponi AS | Real estate | 2022 |
| Alvika Næringspark AS | Real estate | 2021 |
| Alvikvegen 161 AS | Real estate | 2023 |
| Amfro AS | Financial services | 2021 |
| Amh Invest AS | Professional & scientific | 2005 |
| Amliga AS | Professional & scientific | 2009 |
| Amokabel Norway AS | Wholesale & retail | 2008 |
| Amorè Ålesund AS | Hospitality | 2002 |
| Amrap Eiendom AS | | 2020 |
| Ams Motorsykkelsenteret AS | Wholesale & retail | 1992 |
| Anacott Steel AS | | 2019 |
| Ananas Invest AS | | 2023 |
| Anda Invest AS | Wholesale & retail | 2022 |
| Anda-Olsen AS | Wholesale & retail | 1984 |
| Anda-Olsen Holding AS | Wholesale & retail | 2022 |
| Anders Bruvoll Ortopedi AS | Health & social care | 2017 |
| Andersen-Invest AS | | 2023 |
| Andhav Invest AS | | 2019 |
| Andrea Isaksen AS | Education | 2023 |
| Andreas a Holding AS | | 2020 |
| Anette Helen Barstad | Health & social care | 2013 |
| Angvik Ekornes Eiendom AS | Real estate | 2014 |
| Animal Farm AS | Wholesale & retail | 2021 |
| Aninaut Studios AS | Information & communication | 2016 |