| 0LOSS AS | | 2025 |
| 1 Elektriker AS | Construction | 2020 |
| 3T Stjørdal AS | Arts & recreation | 1998 |
| Aadal Holding AS | Real estate | 2013 |
| Aage Vold Autosalg AS | Wholesale & retail | 2013 |
| Aasen & Five AS | Wholesale & retail | 1992 |
| Aavo Holding AS | Real estate | 2005 |
| AB Import AS | Wholesale & retail | 2005 |
| Abas Holding AS | Financial services | 2001 |
| Abp Holding AS | Real estate | 2009 |
| Actuade AS | Information & communication | 2015 |
| Addon Invest AS | | 2026 |
| Advokat Line Gulbrandsen AS | Professional & scientific | 2019 |
| Advokat Tove J. Røddesnes AS | Professional & scientific | 2021 |
| Advokat Veronica L Drivstuen AS | Professional & scientific | 2017 |
| Advokatfirmaet Welde AS | Administrative & support | 2021 |
| Agat Invest AS | Real estate | 2005 |
| Aiso Consult AS | Professional & scientific | 2026 |
| Akademi Medbroen AS | Education | 2020 |
| Akito AS | Wholesale & retail | 2000 |
| Akj Denstad AS | | 2022 |
| Aktiv Stjørdal AS | Real estate | 2012 |
| Alf J. Vennatrø Holding AS | Real estate | 2007 |
| Alf Vennatrø & Sønn AS | Mining & quarrying | 1987 |
| Alfasetveien 1 AS | Real estate | 2024 |
| Aliveness Lab AS | Education | 2023 |
| Alphatec AS | Professional & scientific | 1996 |
| Alpistar | Administrative & support | 2005 |
| Alstadjordet Eiendom AS | Real estate | 2012 |
| Alstadvold Equity AS | Real estate | 2008 |
| Alterno AS | Wholesale & retail | 2009 |
| Amore Stjørdal AS | Hospitality | 2004 |
| Anders Holmen Holding AS | | 2026 |
| Andor Invest AS | | 2020 |
| Andro Invest AS | Real estate | 2024 |
| Anfi AS | Financial services | 2005 |
| Aqua Exposure AS | Professional & scientific | 2024 |
| Arctic Wildlife Tours AS | Administrative & support | 2016 |
| Arild Bjerkås Holding AS | Real estate | 2013 |
| Arn Vennatrø Holding AS | Financial services | 2015 |
| Arne G AS | Construction | 2021 |
| Arne Hernes AS | Construction | 1994 |
| Arne Klæth AS | Professional & scientific | 1988 |
| Aron Vennatrø Holding AS | Real estate | 2009 |
| Arstad Transport AS | Transport & logistics | 2025 |
| Art in Dent AS | Manufacturing | 2025 |
| Arve Jørstad AS | Wholesale & retail | 2009 |
| AS 2 Etage | Real estate | 1989 |
| AS Bergs Minde | Real estate | 1977 |
| AS Fortuna | Real estate | 1981 |
| Aspaas Consulting AS | Real estate | 2000 |
| Astrosa Drift AS | Wholesale & retail | 2006 |
| Astrosa Holding AS | Wholesale & retail | 2005 |
| Aswi AS | Administrative & support | 2012 |
| Athera Intelligence Ltd Nuf | Information & communication | 2026 |
| Atlantic Solution AS | Professional & scientific | 2025 |
| Auds Hjemmetjeneste AS | Health & social care | 2020 |
| Auka Gruppen AS | Real estate | 1955 |
| Auka Karosseri AS | Manufacturing | 2024 |
| Aune Eiendomsdrift AS | Real estate | 2023 |
| Auto 8-8 Trio AS | Wholesale & retail | 1998 |
| Auto E-14 AS | Other services | 2001 |
| Auto E-14 Bil Og Fritid AS | Wholesale & retail | 2025 |
| Auto Midt-Norge AS | Wholesale & retail | 2021 |
| Autoleie Trøndelag AS | Administrative & support | 2000 |
| Autolinq AS | Wholesale & retail | 2016 |
| Automazing AS | Wholesale & retail | 2026 |
| Autoriva AS | Wholesale & retail | 2024 |
| Aviator Airport Alliance AS | Transport & logistics | 2010 |
| Aviator-Osl AS | Transport & logistics | 2007 |
| Avicenna AS | Health & social care | 2012 |
| Aunegården A/S | Real estate | 1988 |
| B.R. Eiendom AS | Real estate | 2013 |
| Babas Eiendom AS | Real estate | 2001 |
| Bakken Autohandel AS | Wholesale & retail | 2023 |
| Bakken Eiendom AS | Real estate | 1968 |
| Balstad Eiendom AS | Wholesale & retail | 1987 |
| Baso Utleie AS | Administrative & support | 1981 |
| Baumas AS | Administrative & support | 2021 |
| Begea Invest Nuf | Financial services | 2010 |
| Begravelsesbyrået Hyldmo AS | Other services | 2014 |
| Beistad-Bang Grunneierlag | Real estate | 2006 |
| Bello Dame Og Herrefrisør AS | Other services | 2008 |
| Bennett Holding AS | Professional & scientific | 1998 |
| Berel AS | Real estate | 2000 |
| Berg Begravelsesbyrå AS | Other services | 2017 |
| Berg Svendsen Holding AS | | 2006 |
| Bergstaden Eiendom AS | Real estate | 2015 |
| Bertel O. Steen Stjørdal AS | Other services | 2013 |
| Bewe AS | Real estate | 2006 |
| Bil-Com AS | Wholesale & retail | 2008 |
| Bithero AS | Professional & scientific | 2013 |
| Bjerkli Holding AS | Construction | 2005 |
| Bjoho Holding AS | Real estate | 2019 |
| Bjørgs Trafikkskole AS | Education | 2017 |
| Bjørkbakken Arrangement AS | Hospitality | 2024 |
| Bjørkbakken AS | Arts & recreation | 2020 |
| Bjørklia 5 AS | Administrative & support | 2014 |
| Bjøru Consulting AS | Professional & scientific | 2024 |
| Blakstad Bolig AS | Real estate | 2015 |