| Ac Investors AS | Financial services | 2019 |
| Ac Jahr Invest AS | Real estate | 2022 |
| Ac Management AS | Financial services | 2020 |
| Ac Mowinckel Holding AS | Financial services | 2005 |
| Ac Varmepumper AS | Construction | 2007 |
| Acad Holding AS | | 2026 |
| Academic Work Consulting Norway AS | Administrative & support | 2008 |
| Academic Work HR Service Norway AS | Administrative & support | 2008 |
| Academic Work Norway AS | Administrative & support | 2006 |
| Academy of Tribes AS | Education | 2021 |
| Acadia Holding AS | Financial services | 2005 |
| Acaia AS | Information & communication | 2018 |
| Acams AS | Information & communication | 2001 |
| Acane AS | Financial services | 1997 |
| Acantus Handel Ans | Wholesale & retail | 2000 |
| Acao AS | Real estate | 2005 |
| Acap Invest AS | Professional & scientific | 2005 |
| Acapital Medi Holdco AS | | 2023 |
| Acapo Onsagers AS | Professional & scientific | 2023 |
| Acapulco Advisors AS | Professional & scientific | 2016 |
| Acara Holding AS | | 2025 |
| Acas Kjøl Og Frys AS | Transport & logistics | 2013 |
| Acatos Consulting AS | Professional & scientific | 2010 |
| Acc 25 AS | | 2025 |
| Acc 25 Holding AS | | 2025 |
| Acc AS | | 2013 |
| Acc K7 AS | Real estate | 2015 |
| ACC3SS AS | Professional & scientific | 2024 |
| Acca Invest AS | Professional & scientific | 2013 |
| Acca Laurentia AS | Wholesale & retail | 2021 |
| Accel AS | Professional & scientific | 2017 |
| Accel Growth AS | Professional & scientific | 2018 |
| Accelerando AS | Financial services | 2007 |
| Accelerate Bidco AS | | 2025 |
| Accelerate Capital AS | Professional & scientific | 2022 |
| Accelerate Employeeco AS | | 2025 |
| Accelerate Holdco AS | Financial services | 2025 |
| Accelerate Midco AS | | 2025 |
| Accelerate Mipco AS | | 2025 |
| Accelerate Software AS | Information & communication | 2019 |
| Accelerate Topco AS | | 2025 |
| Accelerator Trading AS | | 2011 |
| Acceleum Technology AS | Information & communication | 2021 |
| Accelia AS | Information & communication | 2021 |
| Accella Solutions AS | Information & communication | 1994 |
| Accelleron Nordics OY Nuf | Professional & scientific | 2021 |
| Accendia Apa AS | Information & communication | 2026 |
| Accendia AS | Real estate | 2007 |
| Accendia Erp AS | Information & communication | 2025 |
| Accendia Tech AS | Information & communication | 2025 |
| Accendo Da | Agriculture & fishing | 1998 |
| Accendo Investment Management AS | Real estate | 2013 |
| Accendo Produktutvikling AS | Professional & scientific | 2003 |
| Accenture (Danmark) | Administrative & support | 1995 |
| Accenture AS | Information & communication | 2007 |
| Accenture Services AS | Information & communication | 2013 |
| Acceptance Test AS | Information & communication | 2020 |
| Access Holding AS | Other services | 2013 |
| Access Home AS | Wholesale & retail | 2023 |
| Access Låsspesialisten AS | Wholesale & retail | 2001 |
| Access MBM AS | Arts & recreation | 1991 |
| Access Norway Business Consulting AS | Professional & scientific | 2024 |
| Access Norway Consulting AS | Professional & scientific | 2018 |
| Access Rehab AS | Health & social care | 2018 |
| Access World Technic AS | Wholesale & retail | 2022 |
| Accessio Invest AS | | 2006 |
| Accessit AS | Real estate | 2012 |
| Accident Management Services Norge AS | Financial services | 2021 |
| Accidentally Prepared AS | Information & communication | 2025 |
| Accigo AS | Information & communication | 2016 |
| Accillion AS | Information & communication | 2002 |
| Acciona Construccion S.A. Nuf | Construction | 2015 |
| Acciona Infraestructuras and Ghella Ans | Construction | 2015 |
| Accorda AS | Professional & scientific | 2026 |
| Account IT AS | Professional & scientific | 2014 |
| Account Shop AS | Professional & scientific | 2002 |
| Accounta AS | Professional & scientific | 2022 |
| Accountable AS | Professional & scientific | 2019 |
| Accountflow AS | Information & communication | 2017 |
| Accounting Academy AS | Education | 2021 |
| Accounting AS | Professional & scientific | 2008 |
| Accountor Vat-Service AS | Professional & scientific | 1990 |
| Accounts Adviser AS | Professional & scientific | 2022 |
| Accreto AS | Professional & scientific | 2025 |
| Accribos AS | Information & communication | 2015 |
| Accrona AS | Professional & scientific | 2024 |
| Accru Partners Holding I AS | | 2024 |
| Accru Partners Holding II AS | | 2024 |
| Accru Partners Holding III AS | | 2024 |
| Accru Partners Holding IV AS | | 2024 |
| Accru Partners Holding Ix AS | | 2025 |
| Accru Partners Holding V AS | | 2024 |
| Accru Partners Holding Vi AS | | 2025 |
| Accru Partners Holding Vii AS | | 2025 |
| Accru Partners Holding Viii AS | | 2025 |
| Accru Partners Holding X AS | | 2025 |
| Accru Partners Norge AS | Professional & scientific | 2024 |
| Accunor AS | Professional & scientific | 2025 |
| Accuracy Invest AS | | 2026 |
| Accurat Norway AS | Professional & scientific | 2019 |