| 1001 Natt AS | Wholesale & retail | 2012 |
| 2 Holding AS | Financial services | 2015 |
| 3 Bygg Rana AS | Construction | 2023 |
| 3 Lab AS | Manufacturing | 2017 |
| 316 Produksjon AS | Manufacturing | 2025 |
| 3P Consult Ltd Nuf | Professional & scientific | 2010 |
| 3S Drift AS | Construction | 2026 |
| 3T Consult AS | Professional & scientific | 2012 |
| 4S Holding AS | Other services | 2025 |
| 7 Steel Nordic Group AS | Manufacturing | 2006 |
| 7 Steel Nordic Manufacturing AS | Manufacturing | 1989 |
| 7 Steel Nordic Reinforcing AS | Manufacturing | 1998 |
| A & G Trelast Agentur Da | Wholesale & retail | 1989 |
| A. Reinholdtsen Holding AS | Construction | 2022 |
| A.H.A Holding AS | | 2026 |
| Abpb Holding AS | | 2024 |
| Acr AS | Arts & recreation | 2019 |
| Actaklinikken AS | Health & social care | 2005 |
| Advokat John Erik Nygaard AS | Professional & scientific | 2025 |
| Advokatbygg Mo AS | Real estate | 2013 |
| Advokatcompagniet Nordland Eiendom AS | Real estate | 2007 |
| Advokatfirmaet Sjaaeng AS | Professional & scientific | 2025 |
| Advokathuset Helgeland AS | Professional & scientific | 2025 |
| Advokathuset Just AS | Administrative & support | 2002 |
| Afrodite Hårstudio AS | Other services | 2012 |
| Agas Kantinedrift Og Catering AS | Hospitality | 2006 |
| Aglen Invest AS | | 2021 |
| Ahlund Holding AS | Financial services | 2017 |
| Aigis AS | Information & communication | 2026 |
| Aim Eie AS | Professional & scientific | 2002 |
| Aim Strandgata AS | Real estate | 2010 |
| Aime Global AS | Information & communication | 2025 |
| Ainasoja Elektromekaniske AS | Construction | 2024 |
| Aj-I AS | | 2020 |
| Ajo Maskin AS | Construction | 1986 |
| Akki AS | | 2021 |
| Aksa Ans | Information & communication | 2024 |
| Albertsen AS | Transport & logistics | 2024 |
| Albertsens Begravelsesbyrå AS | Other services | 2002 |
| Alejandro Invest AS | | 2021 |
| Alfa Eiendom AS | Real estate | 1994 |
| Alkaja Holding AS | Construction | 2012 |
| Allinn Holding AS | | 2025 |
| Allinn Invest AS | | 2025 |
| Almita Holding AS | | 2024 |
| Almli Holding AS | Financial services | 2015 |
| Alpha System AS | Wholesale & retail | 1999 |
| Alteren Og Omeng Maskinlag SA | Agriculture & fishing | 2001 |
| Altermark Vannverk SA | Water & waste | 2011 |
| Alterskjær Transport AS | Mining & quarrying | 1996 |
| Altimo AS | Wholesale & retail | 2018 |
| Amber Passivhus AS | Professional & scientific | 2017 |
| Amor Mo I Rana AS | Wholesale & retail | 2023 |
| Anaso 544 Holding AS | | 2023 |
| Andre Investeringer AS | | 2022 |
| Andreas Linds Gate 15 AS | Real estate | 2015 |
| Ane Invest AS | Other services | 2008 |
| Angel Lysdesign Vegar Andreassen | Arts & recreation | 2013 |
| Anja Rødfjell Bredesen AS | Other services | 2024 |
| Anleggs-Service AS | Construction | 1989 |
| Anlia Dental AS | Health & social care | 2023 |
| Ans Cleopatra | Arts & recreation | 1990 |
| Antirust Helgeland AS | Other services | 2021 |
| Apexstride Holding AS | Professional & scientific | 2024 |
| Apotekergården Rana AS | Real estate | 2007 |
| Aq Land-Based AS | Manufacturing | 2026 |
| Aq Solutions AS | Manufacturing | 2023 |
| Ar Entreprenør AS | Construction | 2022 |
| Aras Resources AS | Administrative & support | 2021 |
| Arctic Food & Event AS | Hospitality | 2022 |
| Arctic Grid AS | Construction | 2023 |
| Arctic Hosting AS | Information & communication | 2025 |
| Arctic Medispa AS | Health & social care | 2022 |
| Arctic Partner AS | Real estate | 2006 |
| Arctic Rein Og Vilt AS | Manufacturing | 2013 |
| Arctic Seafarm Holding AS | Agriculture & fishing | 2024 |
| Arctic Seed AS | Professional & scientific | 2022 |
| Arctic Square Studio AS | Information & communication | 2026 |
| Arctic Survey AS | Professional & scientific | 2019 |
| Arctic Technologies AS | Information & communication | 2026 |
| Areal Renhold AS | Administrative & support | 2024 |
| Arena Bygg AS | Construction | 2006 |
| Arena Drift AS | Arts & recreation | 2006 |
| Arkinord AS | | 2021 |
| Arne Sjule AS | Wholesale & retail | 2014 |
| Arne Sjule Holding AS | Real estate | 2015 |
| Aros Technologies AS | Information & communication | 2026 |
| Arstad Eiendom AS | Real estate | 1995 |
| Art Eiendom AS | Real estate | 2016 |
| AS Fjellsprengning | Construction | 2019 |
| AS Lars Meyersgt 13 | Real estate | 1973 |
| AS Nordland Teater | Arts & recreation | 1981 |
| AS Rana Blad | Information & communication | 1982 |
| Asfaltfres Rana AS | Construction | 2019 |
| Asiac Holding AS | | 2022 |
| Askeladden Ressurssenter AS | Health & social care | 2006 |
| Asle Bjørklund Holding AS | Manufacturing | 2005 |
| Asmo Eiendom AS | Real estate | 2021 |
| Auron Invest AS | Professional & scientific | 2008 |
| Aurora Ambitions AS | Professional & scientific | 2025 |