| &Partners AS | Professional & scientific | 2020 |
| 11 Eiendom AS | Real estate | 2025 |
| 3 Ca Holding AS | Construction | 2005 |
| 3ND Eiendom AS | Real estate | 2020 |
| 4HTB AS | Professional & scientific | 2021 |
| A Company AS | Education | 2013 |
| A-Bygg & Fasade AS | Construction | 2018 |
| A.E.S Invest AS | | 2026 |
| Aa Arena AS | Professional & scientific | 2007 |
| Abc Revisjon AS | Professional & scientific | 2009 |
| Ac-Suncare Institute AS | Wholesale & retail | 2003 |
| Aca Property AS | Real estate | 2012 |
| Acana Group AS | | 2021 |
| Accar & Son AS | Manufacturing | 2017 |
| Adamsrød Ferdigplen AS | Agriculture & fishing | 2005 |
| Adamsrød Holding AS | Agriculture & fishing | 2005 |
| Adferdsporet AS | Education | 2025 |
| Adolfsen Elektro Ltd Nuf | Construction | 2016 |
| Aerobic Kjellern Da | Arts & recreation | 1989 |
| Afa Investment AS | Financial services | 2006 |
| Agar Constructions Doo | Construction | 2022 |
| Ageru AS | Real estate | 2006 |
| Agr Rønning Invest AS | Administrative & support | 2019 |
| AI Chat Norge AS | Professional & scientific | 2024 |
| AI Green Bytes AS | Information & communication | 2023 |
| Aka Invest AS | Financial services | 2016 |
| Akk AS | Real estate | 2018 |
| Akkm AS | Real estate | 2022 |
| Akset AS | | 2019 |
| Aktieselskapet Torvgaten 13 | Real estate | 1915 |
| Alanor AS | Wholesale & retail | 1985 |
| Alector Holding AS | Real estate | 2014 |
| Alexanders Malerservice AS | Construction | 2026 |
| Alien's Eiendom AS | Real estate | 2020 |
| Alima AS | Real estate | 2010 |
| Alj Holding AS | Other services | 2020 |
| All Onboard Adventure AS | Administrative & support | 2020 |
| Altino Engineering AS | Professional & scientific | 2019 |
| Amadeus Syvertsen Berg Holding AS | | 2021 |
| Amped Up AS | Professional & scientific | 2023 |
| Ams Consulting AS | Professional & scientific | 2017 |
| An-Com AS | Professional & scientific | 1984 |
| Anaripigg Holding AS | Real estate | 2014 |
| Andre Vind Ans | Professional & scientific | 2024 |
| Andreesen Eiendom AS | Real estate | 2011 |
| Apns Service AS | Administrative & support | 2024 |
| Arbeidskar AS | Real estate | 2025 |
| Arctic Eiendom Nord AS | Real estate | 2014 |
| Arild Vedvik Holding AS | Professional & scientific | 2025 |
| Armstad AS | Professional & scientific | 2017 |
| Art of Beauty Studio Inga Ro AS | Other services | 2023 |
| Artemis Gynekologiske Senter AS | Health & social care | 2018 |
| AS Byggisolering | Construction | 1974 |
| Asfalt AS | Construction | 2017 |
| Asia Gourmet AS | Hospitality | 2021 |
| Aspectum AS | Wholesale & retail | 2019 |
| Atlas Medica AS | Real estate | 2006 |
| Atlaslegene Da | Health & social care | 2011 |
| Atp AS | Real estate | 2013 |
| Atp France AS | Real estate | 2017 |
| Atp Gruppen AS | Real estate | 2020 |
| Atp Gruppen Holding AS | Real estate | 2019 |
| Auker AS | | 2023 |
| Automasjon & Sikkerhet AS | Wholesale & retail | 2016 |
| Avia Eiendom AS | Real estate | 2020 |
| B.D Eiendom AS | Construction | 2017 |
| B.D Holding AS | Construction | 2017 |
| Baai AS | Real estate | 2017 |
| Balanse Invest AS | Real estate | 2008 |
| Baltasar Eiendom AS | Real estate | 2018 |
| Bang AS | Administrative & support | 2014 |
| Barkåker 2S12 AS | Real estate | 2021 |
| Bas Investering AS | | 2020 |
| BBM Teknikk AS | Other services | 2017 |
| Beckmann Engineering AS | | 2026 |
| Bedriftsleder AS | Professional & scientific | 2007 |
| Bella B Holding AS | | 2020 |
| Bent Johnny Nergård AS | Health & social care | 2010 |
| Berentsen Invest AS | Real estate | 2019 |
| Berg Hansen AS | Construction | 2022 |
| Bergesen Consult AS | Professional & scientific | 2015 |
| Bevisst Ledelse AS | Professional & scientific | 2025 |
| Bibbis Stauder Holding AS | | 2023 |
| Billy X Media AS | Information & communication | 2025 |
| Binon AS | | 1978 |
| Binon Eiendom AS | Water & waste | 2019 |
| Birkrem Helse AS | Health & social care | 2024 |
| Bitbase AS | Information & communication | 2013 |
| Bjarne Hansensvei AS | Real estate | 2014 |
| Bjolin AS | Real estate | 2007 |
| Bjunebygg AS | Construction | 2016 |
| Bjällhag Holding AS | | 2026 |
| Bjørn H Madsen AS | Professional & scientific | 2011 |
| Bjørnar Heimdal AS | Wholesale & retail | 1998 |
| Bleck AS | Health & social care | 2011 |
| Blom AS | | 2020 |
| Blue Lagoon Eiendom AS | Real estate | 2021 |
| Bogen Barnehage SA | Education | 1989 |
| Bogen Invest AS | Real estate | 2005 |
| Bogentech AS | | 2025 |