| 123HAPPYNOW AS | Education | 2020 |
| 14SAFETY AS | Information & communication | 2019 |
| 247REGNSKAP AS | Professional & scientific | 2014 |
| 2M Malerfirma AS | Construction | 2015 |
| 3S Holding AS | Wholesale & retail | 2007 |
| A & T Grodowscy Da | Wholesale & retail | 2009 |
| A G Storvik Eiendom AS | Real estate | 2022 |
| A-B Holding AS | Real estate | 2005 |
| A. Næsje AS | Wholesale & retail | 2025 |
| A.B. Boligservice AS | Wholesale & retail | 2015 |
| Aalesundfisk Holding AS | Wholesale & retail | 2007 |
| Aasprong Invest AS | Real estate | 2018 |
| AB1 Holding AS | | 2022 |
| Abc Energiconsult AS | Professional & scientific | 2011 |
| Abc Trafikkskole AS | Education | 1989 |
| Ability Kompetanse AS | Administrative & support | 1988 |
| Abyss AS | Agriculture & fishing | 2004 |
| Abyss Assets AS | Transport & logistics | 2012 |
| Abyss Group AS | Agriculture & fishing | 2012 |
| Abyss Ship Assets AS | Transport & logistics | 2022 |
| Abyss Ship Management AS | Agriculture & fishing | 2015 |
| Advokat Camilla Betten Solbakken AS | Professional & scientific | 2021 |
| Advokat Katharina Angvik Hjelmaas AS | Professional & scientific | 2017 |
| Advokat Leirvåg AS | Professional & scientific | 2005 |
| Advokat Lill Snekvik AS | Professional & scientific | 2016 |
| Advokat Magnhild Meringen AS | Professional & scientific | 2006 |
| Advokat Neergård AS | Professional & scientific | 2017 |
| Advokatene På Storkaia Da | Professional & scientific | 2008 |
| Advokatfirmaet Eide & Co AS | Professional & scientific | 2009 |
| Advokatfirmaet Julnes AS | Professional & scientific | 2019 |
| Advokatfirmaet Juridix AS | Professional & scientific | 2020 |
| Advokatfirmaet Åke Sjøberg AS | Professional & scientific | 1999 |
| Advokathuset Kristiansund AS | Administrative & support | 2011 |
| Aero Q-Solutions Laboratories AS | Professional & scientific | 2026 |
| Af Utvikling AS | Financial services | 2006 |
| Aft Holding AS | Real estate | 2014 |
| Ahlgren Holding AS | | 2020 |
| Aiota AS | Information & communication | 2024 |
| Aitive AS | Professional & scientific | 2026 |
| Aitive Revisjon AS | Professional & scientific | 2026 |
| Ajc Maritime AS | Professional & scientific | 2022 |
| Ajp Invest AS | Financial services | 2016 |
| Akasuki AS | Professional & scientific | 2022 |
| Aktiv Kjøreskole AS | Education | 1993 |
| Aktiv Nordvest AS | Real estate | 2019 |
| Akva Solutions AS | Professional & scientific | 2020 |
| Aladdin AS | Wholesale & retail | 2022 |
| Albatros Technology Da | Mining & quarrying | 2004 |
| Alfred Berge AS | Wholesale & retail | 2000 |
| Algea AS | Manufacturing | 1937 |
| Algea Harvest AS | Agriculture & fishing | 2019 |
| Aljos Marine & Industri AS | Construction | 2014 |
| Alkymi Holding AS | | 2022 |
| Allanengen Eiendom AS | Real estate | 1996 |
| Almvik Brannvernservice AS | Wholesale & retail | 1998 |
| Almvik Invest AS | Real estate | 1993 |
| Alpino Pizza Og Grill AS | Hospitality | 2025 |
| Alsea Holding AS | Financial services | 2013 |
| Alterm AS | Professional & scientific | 2020 |
| Alvant Invest AS | | 2025 |
| Alvheim - Klinge Holding AS | Financial services | 2013 |
| Am Utbygging AS | Real estate | 2016 |
| Amax AS | Hospitality | 2001 |
| Aml Utbygging AS | Real estate | 2024 |
| Amundøy Holding AS | | 2026 |
| Analyse Invest AS | | 2012 |
| Analyseinvest AS | Real estate | 1986 |
| Anb Projects AS | Construction | 2024 |
| Ans Atlantic Gym | Arts & recreation | 1989 |
| Ans Bybo | Real estate | 1991 |
| ANS Fløiveien 4 - Ole Rune Botten & Bjørn Hagen | | 1988 |
| Ans Geto Tech | Wholesale & retail | 1988 |
| Ansa Holding AS | Financial services | 2013 |
| Ant Røntgen AS | Health & social care | 2020 |
| Apoint AS | Professional & scientific | 2006 |
| Apollon Invest AS | Real estate | 2019 |
| Aquarian AS | Wholesale & retail | 2022 |
| Aquaship AS | Transport & logistics | 2018 |
| Aquaship Salmon Star AS | Transport & logistics | 2015 |
| Arctic Hotel Nordkapp AS | Real estate | 2019 |
| Arctic Nutra AS | Wholesale & retail | 2026 |
| Arkaden Bolig AS | Real estate | 2021 |
| Arkitektkompaniet Ans | Professional & scientific | 1987 |
| Arnt a Wærnes Holding AS | Real estate | 2019 |
| Ars Holding AS | Real estate | 2013 |
| AS Auto Elektro | Other services | 1977 |
| AS Blindheim Estate | Agriculture & fishing | 2021 |
| AS Fosnagaten 16 | Real estate | 1963 |
| AS FR Nansensg 12 | Real estate | 1969 |
| AS Freiveien 10 - 12 | Real estate | 1967 |
| AS Solbasseng | Wholesale & retail | 2002 |
| Aspåsen Panorama AS | Construction | 2011 |
| Astoria Hotell Kristiansund AS | Real estate | 1992 |
| At Byggservice AS | Professional & scientific | 2013 |
| Ataraxia AS | Real estate | 2007 |
| Atlanten Camping Da | Hospitality | 1990 |
| Atlanten Kunstis AS | Arts & recreation | 2010 |
| Atlanten Turistsenter AS | Real estate | 2017 |
| Atlanterbygg Og Eiendom AS | Construction | 2021 |
| Atlanterhavshotellet Kristiansund AS | Hospitality | 2006 |