| 2469 Reiselivsutvikling AS | Professional & scientific | 2017 |
| 2B Prosjekt AS | Real estate | 2015 |
| 7WAVES AS | Professional & scientific | 2011 |
| A Dunder AS | | 2022 |
| A&B Cirka AS | Professional & scientific | 2022 |
| A&B Holding AS | Real estate | 2022 |
| A-Tec AS | Manufacturing | 2009 |
| A-Tec Ballistics AS | Manufacturing | 2017 |
| A-Tec Holding AS | Real estate | 2020 |
| Aanestad AS | Construction | 2018 |
| Aasbekken Service AS | | 2019 |
| Aasen Eiendomsmegling AS | Real estate | 2014 |
| Abacus IT AS | Information & communication | 2004 |
| Abacus Ratio AS | Professional & scientific | 1992 |
| Abacus Software AS | Information & communication | 2020 |
| Acegame AS | Information & communication | 2024 |
| Active Pharma AS | Professional & scientific | 2019 |
| Active Services AS | Professional & scientific | 2013 |
| Advokat Jan Samuelsen AS | Financial services | 2005 |
| Advokatfirmaet Gaustad AS | Professional & scientific | 2025 |
| Aedix AS | Information & communication | 2026 |
| Aej Invest AS | Real estate | 2009 |
| Aen Løsning AS | Construction | 2025 |
| Afs Gruppen AS | Professional & scientific | 2018 |
| Afs Trading AS | Professional & scientific | 2018 |
| Agro Produkter Ans | Agriculture & fishing | 1995 |
| Ags Batteriservice AS | Wholesale & retail | 1983 |
| Ahh AS | Construction | 2005 |
| Aiakaki AS | Information & communication | 2026 |
| Aiello Eventyr AS | Arts & recreation | 2025 |
| Akershus Boligforvaltning AS | Real estate | 2022 |
| Akkurat Invest AS | Information & communication | 2021 |
| Aktiva Takst AS | Real estate | 2021 |
| Allsize Company Norge Nuf | Wholesale & retail | 2004 |
| Alma Holding AS | | 2025 |
| Ancilla Ltd Nuf | Wholesale & retail | 2004 |
| Anders Throndsen Holding AS | | 2021 |
| Andreassen Datapartner AS | Wholesale & retail | 2004 |
| Andsk Holding AS | | 2018 |
| Andsk Transport AS | Transport & logistics | 2019 |
| Anker Bygg Prosjekt AS | Construction | 2014 |
| Anker Holding AS | Construction | 2017 |
| Anleggsdrift Øst AS | Construction | 2018 |
| Anna Olsson AS | | 2022 |
| Apoteket I Son AS | Wholesale & retail | 2007 |
| Aqua Norge AS | Administrative & support | 2008 |
| Aqua Power Cube AS | Energy | 2022 |
| Arctic Vision Consulting AS | Professional & scientific | 2001 |
| Arfu AS | Construction | 2022 |
| AS Bygg Og Eiendomsprosjekt | Construction | 2000 |
| AS Inta | Wholesale & retail | 1939 |
| AS Porta | Financial services | 1989 |
| AS Ringvassøy | Financial services | 1982 |
| Assess Gruppen AS | Real estate | 2015 |
| Autoclaims AS | Professional & scientific | 2024 |
| Autoidentity AS | Information & communication | 2025 |
| Awp Invest AS | | 2025 |
| B&E Holding AS | | 2025 |
| Bad Og Flis Vestby AS | Construction | 2017 |
| Bare Digital AS | Professional & scientific | 2007 |
| Barnas Hjerterom AS | Health & social care | 2026 |
| Barneparadis Ans | Wholesale & retail | 1994 |
| Bautamind AS | Education | 2024 |
| Bbi Bavaria Import AS | Wholesale & retail | 1998 |
| BCN Innovation Holding AS | Arts & recreation | 2020 |
| BDN Holding AS | Professional & scientific | 2015 |
| Beauty Health & Sport AS | Other services | 2014 |
| Bedre Økonomi AS | Professional & scientific | 2001 |
| Bes Holding AS | Wholesale & retail | 2005 |
| Betania Eiendom Son Ans | Real estate | 1990 |
| Bika Invest AS | Financial services | 2018 |
| Bilfixer AS | Other services | 2020 |
| Bilskadehjelp AS | Other services | 2017 |
| Bjerkland Invest AS | Real estate | 2005 |
| Bli God AS | Wholesale & retail | 2018 |
| Boion Eiendom AS | Real estate | 2023 |
| Boliglyst AS | Real estate | 2022 |
| Boliglyst Bygg AS | Construction | 2024 |
| Boliglyst Gruppen AS | Real estate | 2024 |
| Boliglyst Produksjon AS | Manufacturing | 2024 |
| Boliglyst Stor Oslo AS | Real estate | 2025 |
| Boliglyst Swap Og Utleie AS | Real estate | 2024 |
| Booking Partner AS | Professional & scientific | 2015 |
| Borge Productions AS | Information & communication | 2004 |
| Borge Prosjektadministrasjon AS | Professional & scientific | 2018 |
| Bos Consult AS | Professional & scientific | 2012 |
| Boss Analytics AS | Information & communication | 2018 |
| Branca AS | Financial services | 2010 |
| Bregmo's Reklamgodis AB Nuf | Manufacturing | 2007 |
| Breisteingården Service AS | | 2022 |
| Brevigtoppen Holding AS | Real estate | 2005 |
| Brevik Kro Og Pizza AS | Hospitality | 2018 |
| Brevik Legesenter Da | Health & social care | 2017 |
| Brevikmyra Ans | Real estate | 1997 |
| Brevikveien 7 AS | Real estate | 2001 |
| Brygga Mat AS | Wholesale & retail | 1995 |
| Brødrene Lerviks Båtbyggeri Ans | Transport & logistics | 2011 |
| Brødrene Thomassen Bygg AS | Construction | 2011 |
| Brødrene Thomassen Eiendom AS | Construction | 2004 |
| Brødrene Thomassen Prosjekt AS | Real estate | 2011 |