| 24/7 Budservice AS | Transport & logistics | 2017 |
| 4K Bil AS | Wholesale & retail | 2019 |
| A Finstad Cad AS | Professional & scientific | 2018 |
| A Haugan Holding AS | | 2025 |
| A3 Maskin AS | Construction | 2021 |
| Aaknes Holding AS | | 2025 |
| Aasmyr Eiendom AS | Real estate | 2026 |
| Abc-Takst AS | Real estate | 2005 |
| Abraham Taxi AS | Transport & logistics | 2024 |
| Accipiter Holding AS | Professional & scientific | 2017 |
| Adah Invest AS | | 2013 |
| Adelsmann AS | Wholesale & retail | 2002 |
| Advokat Anders Kjøren AS | Professional & scientific | 2019 |
| Advokat-Consult AS | Professional & scientific | 2011 |
| Advokatfirma Midt AS | Professional & scientific | 2024 |
| Advokatfirmaet Libertus AS | Professional & scientific | 2013 |
| Advokatfirmaet Olve AS | Professional & scientific | 2025 |
| Advs Eiendom AS | Real estate | 2024 |
| Advs Invest AS | Real estate | 2021 |
| Aestjernen AS | Professional & scientific | 2022 |
| Af Kne-Røstad Ans | Construction | 2020 |
| Agritech AS | Wholesale & retail | 2022 |
| AI Robotics AS | Information & communication | 2025 |
| Al Konsult AS | | 2018 |
| Ala Helse&Invest AS | Health & social care | 2006 |
| Alpha Software AS | Information & communication | 2022 |
| Alstad Eiendom AS | Real estate | 1997 |
| Am Følstad Invest AS | | 2024 |
| Amartini No AS | | 2026 |
| Amigos Latinos AS | Hospitality | 2025 |
| Anders Juberg AS | Wholesale & retail | 1996 |
| Anders Kjøren Holding AS | Professional & scientific | 2019 |
| Andreas Moen AS | Agriculture & fishing | 2016 |
| Anico AS | Professional & scientific | 2025 |
| Anico Holding AS | | 2025 |
| Anne Marie Buklev Og Svein Horg Ans | Agriculture & fishing | 2005 |
| Antons Viltforedling AS | Real estate | 2020 |
| Apex Nor AS | Real estate | 2013 |
| Appliq AS | Information & communication | 2002 |
| Arctic Feed Ingredients AS | Professional & scientific | 2013 |
| Arken Holding AS | Real estate | 2000 |
| Arne Holm Maskin AS | Construction | 2012 |
| Arnso AS | Construction | 2024 |
| Arvid M Invest AS | | 2021 |
| AS Interiør | Wholesale & retail | 1986 |
| AS Matheus | | 2016 |
| AS Nord-Trøndelag | Manufacturing | 1919 |
| AS Odd Fellow Huset | Real estate | 1977 |
| AS Rolleiv Pedersen Transport | Transport & logistics | 2020 |
| Asphaugen Samfunnshus SA | Real estate | 1964 |
| Asplan Eiendom AS | Real estate | 2001 |
| Aspo Invest AS | | 2002 |
| Augla AS | Construction | 2023 |
| Aunet Samdrift Ans | Agriculture & fishing | 1998 |
| Aurora Distribution Da | Wholesale & retail | 2024 |
| Aurstad VVS AS | Construction | 2018 |
| Austheim Maskin AS | Construction | 2008 |
| Austli-Holding AS | | 2026 |
| Auto Fire AS | Other services | 1988 |
| Autometall AS | Wholesale & retail | 1994 |
| Autopartner AS | Other services | 1995 |
| Aventador Wheels AS | Wholesale & retail | 2017 |
| Avia Technologies AS | Information & communication | 2023 |
| Ax Innovasjon AS | Professional & scientific | 2007 |
| Axel Sellægs Veg 2 AS | Real estate | 2023 |
| Arkitektkontoret H2 A/S | Professional & scientific | 1988 |
| B Bratberg Eiendom AS | Real estate | 2020 |
| B-O Holding AS | | 2021 |
| B. Furre Holding AS | Administrative & support | 2005 |
| Backham Eiendom AS | Real estate | 2018 |
| Backham Invest AS | Real estate | 2005 |
| Bakemann AS | Manufacturing | 2022 |
| Baker'N Steinkjer AS | Wholesale & retail | 2008 |
| Baker'N Steinkjer Dampsaga AS | Hospitality | 2014 |
| Balders Veg 1 AS | Real estate | 2019 |
| Baldrik Invest AS | | 2023 |
| Banegården AS | Real estate | 2007 |
| Barstad Transport AS | Transport & logistics | 2002 |
| Belling AS | Financial services | 2016 |
| Bente Hjemmetjeneste AS | Health & social care | 2012 |
| Berg Hindklev Eiendom AS | | 2022 |
| Bergen Budservice AS | Transport & logistics | 2018 |
| Bergmo Utbygging AS | | 2026 |
| Berre Optik AS | Wholesale & retail | 2011 |
| Best Kids Norway AS | Wholesale & retail | 2011 |
| Big Twin Eiendom AS | Real estate | 2020 |
| Bil Og Maskinomsetning AS | Wholesale & retail | 2015 |
| Bildstadsmia AS | Manufacturing | 2018 |
| Bille AS | Wholesale & retail | 2018 |
| Bille Holding AS | Wholesale & retail | 2018 |
| Bilpleien Steinkjer AS | Other services | 2017 |
| Bilservice Steinkjer AS | Other services | 2004 |
| Binde Eiendom AS | Real estate | 2014 |
| Binde Holding AS | Construction | 2014 |
| Binde Rør AS | Construction | 2026 |
| Bindegruppen AS | Professional & scientific | 2017 |
| Bio-Fysio AS | Health & social care | 2020 |
| Biodrone AS | Information & communication | 2021 |
| Bjerkem Holding AS | Hospitality | 2023 |
| Bjo Helse AS | Health & social care | 2026 |