| 24 Salg AS | Wholesale & retail | 2023 |
| 2M&CO AS | Real estate | 2016 |
| 3BYGG-TAK AS | Construction | 2021 |
| 4ZURE AS | Information & communication | 2022 |
| Abdaly Spesialist Allmennmedisin AS | Health & social care | 2010 |
| Abr Invest AS | Financial services | 2005 |
| Absolutt Emballasje Norge AS | Wholesale & retail | 2025 |
| Ac-Sande Eiendom AS | Real estate | 2009 |
| Acd Invest AS | Administrative & support | 2010 |
| Acrylicon Industrigulv AS | Construction | 2005 |
| Aditech AS | Wholesale & retail | 2000 |
| Aiindustri AS | Manufacturing | 2024 |
| Aivio AS | Information & communication | 2025 |
| Ak Construction AS | Professional & scientific | 2014 |
| Akam Invest AS | Financial services | 2011 |
| Akeb AS | Agriculture & fishing | 1988 |
| Akl Invest AS | Financial services | 2005 |
| Aktiv Energi AS | | 2005 |
| Aktiv Energi Øst AS | Real estate | 1987 |
| Albums Gate 11 AS | Real estate | 2018 |
| Alfred Engnes Vei AS | Real estate | 2022 |
| Alliance Sande AS | Wholesale & retail | 2006 |
| Alltemp AS | Construction | 2020 |
| Alnime Holding AS | Transport & logistics | 2007 |
| Alt Holding AS | Real estate | 2003 |
| Alt Mulig Live AS | Arts & recreation | 2021 |
| Ammara & Shamyl Eiendom AS | Real estate | 2017 |
| Ancasima AS | | 2019 |
| André Hagen Holding AS | | 2021 |
| Anor AS | Construction | 2012 |
| Anor Holding AS | Real estate | 2014 |
| Anvel AS | Information & communication | 2026 |
| Argoz Holding AS | Professional & scientific | 2024 |
| Arin Import | | 1984 |
| Aristo Axia AS | Real estate | 2018 |
| Armand Consulting AS | Professional & scientific | 2019 |
| Aromasol Lørenskog AS | Other services | 2008 |
| Art of Life Interiør AS | Wholesale & retail | 2010 |
| Artkoat AS | Professional & scientific | 2018 |
| AS Invest AS | Financial services | 2005 |
| AS Sande Meieri Handelslag | Wholesale & retail | 2006 |
| Asko Oslofjord AS | Wholesale & retail | 1970 |
| Athenacon AS | Information & communication | 2010 |
| Audiosmith Event Media AS | Arts & recreation | 2025 |
| Aunes Holding AS | | 2023 |
| Aurora Borealis Steigen Eiendom AS | Real estate | 2025 |
| Avalto Holding AS | Construction | 2020 |
| Avantum AS | Agriculture & fishing | 2007 |
| Avs Norge AS | Construction | 2024 |
| Avs-Holding AS | Wholesale & retail | 2021 |
| Axor VVS AS | Construction | 2019 |
| B & G Eiendom AS | Real estate | 2012 |
| B Strømnæs AS | Wholesale & retail | 1987 |
| B.H. Ramberg AS | Transport & logistics | 2004 |
| Backbit AS | Real estate | 2021 |
| Backbit D AS | Real estate | 2021 |
| Backbit E1 AS | Real estate | 2023 |
| Backbit E2 AS | | 2024 |
| Bagheera Holding AS | | 2024 |
| Balika Holding AS | | 2022 |
| Basketak AS | Professional & scientific | 2017 |
| BB Invest Bent Bjørnsen AS | Wholesale & retail | 2003 |
| BB Studio & Artistservice Ans | Wholesale & retail | 1986 |
| Beatifico AS | Financial services | 2005 |
| Beheim AS | Agriculture & fishing | 2022 |
| Beitostølen Sportell AS | Real estate | 1992 |
| Bencon AS | Professional & scientific | 2023 |
| Benterud Skog AS | Agriculture & fishing | 2014 |
| Berger SG Holding AS | | 2025 |
| Berger Snø Og Grønt AS | Administrative & support | 2025 |
| Bergsgata AS | Financial services | 2017 |
| BGR AS | Real estate | 2013 |
| Bilpåbygg AS | | 2025 |
| Biocommunication AS | Professional & scientific | 2017 |
| Bjertnestunet Utvikling AS | Real estate | 2011 |
| Bjoson Invest AS | Real estate | 2011 |
| Bjørkebo AS | Administrative & support | 2016 |
| Bjørløw Campingdrift AS | Hospitality | 1996 |
| Bjørn Ramberg Invest AS | Transport & logistics | 2021 |
| Bjørn Østby AS Ingeniør Og Entreprenørforretning | Construction | 1987 |
| Bjørndalåsen Bolig AS | Real estate | 2011 |
| Bjørndalåsen Panorama AS | Construction | 2008 |
| Bjørndalåsen Utvikling AS | Real estate | 1985 |
| Bjørnstadveien AS | Construction | 2016 |
| Blikkenslager Stian Brandal AS | Construction | 2015 |
| BMD Holding AS | Real estate | 2012 |
| Bmde AS | Construction | 2012 |
| Bolstad Entreprenør AS | Construction | 2008 |
| Bolstad Gårdsdrift AS | Agriculture & fishing | 2008 |
| Bonden Bær AS | Agriculture & fishing | 2021 |
| Bonden Felleslager AS | Real estate | 2011 |
| Bonden Grønthandel AS | Manufacturing | 1995 |
| Bondiveien Eiendom AS | Real estate | 2015 |
| BORG1 Invest AS | Professional & scientific | 2022 |
| Borgtek AS | Professional & scientific | 2022 |
| Brand Embracer AS | Wholesale & retail | 2022 |
| Brandtsgård Buss AS | Transport & logistics | 2012 |
| Breda AS | Manufacturing | 2005 |
| Breda Bygg AS | Manufacturing | 1988 |
| Breda Eiendom AS | Real estate | 1996 |