| 0495 Grefsen AS | Real estate | 2017 |
| 1T Tømrer AS | Construction | 2012 |
| A.H.Syversen AS | Real estate | 2012 |
| A3K Gruppen AS | Administrative & support | 2026 |
| Aarseth Boligventilasjon AS | Construction | 2006 |
| Aas Invest AS | Professional & scientific | 1988 |
| Ab-Farma AS | Wholesale & retail | 2023 |
| Absolutt Betongsaging AS | Construction | 2017 |
| Absolutt Maskin AS | Construction | 2025 |
| Ad Sales AS | Professional & scientific | 2021 |
| Advokatfirma Niedzielski AS | Professional & scientific | 2013 |
| Aerocom Norge AS | Construction | 2009 |
| Aktivitet Nordic AS | Education | 2021 |
| Akw Drift AS | Real estate | 2022 |
| Alfa Proff AS | Construction | 2021 |
| Alier AS | Manufacturing | 2012 |
| Alimenta AS | Wholesale & retail | 2002 |
| Amot Lysdesign AS | Professional & scientific | 2025 |
| Amsi Invest AS | Real estate | 2005 |
| Amsmart AS | Wholesale & retail | 2012 |
| Anba AS | Construction | 2021 |
| Anders Ranheim Holding AS | Financial services | 2013 |
| Andreas Torpen AS | Construction | 2012 |
| Annikena Invest AS | | 2024 |
| Antra AS | Wholesale & retail | 1989 |
| Arena Transport AS | Transport & logistics | 2025 |
| Armira Invest AS | | 2024 |
| AS Sigurd Hesselberg | Wholesale & retail | 1930 |
| Asgm Solutions AS | Information & communication | 2023 |
| Asia Express AS | Wholesale & retail | 2015 |
| Aspire Brands Pet AS | Wholesale & retail | 2004 |
| Assetsgrowth AS | | 2024 |
| Asus Holding AS | | 2024 |
| Audun Olsen Holding AS | Wholesale & retail | 2006 |
| Aurland Revisjon Og Regnskap AS | Professional & scientific | 2016 |
| Ausen AS | Real estate | 2005 |
| Ausen Holding AS | | 2020 |
| Ausen Transport AS | Transport & logistics | 2012 |
| Auto Care AS | Wholesale & retail | 1988 |
| Auto Rio AS | Wholesale & retail | 2024 |
| Avicare Consulting AS | | 2023 |
| B.Holding AS | Wholesale & retail | 2023 |
| Badminton Play AS | Arts & recreation | 2016 |
| Bahr Invest AS | | 2026 |
| Bahr Transport AS | Transport & logistics | 2024 |
| Baker Pos A/S Nuf | | 2026 |
| Bakir Invest AS | Transport & logistics | 2022 |
| Bakke Capital Holding AS | | 2026 |
| Bauer Gearmotorer AS | Wholesale & retail | 2002 |
| BBB Honning AS | Agriculture & fishing | 2023 |
| Be Eiendom AS | Real estate | 2005 |
| Begna Bil AS | Other services | 2023 |
| Ben-Avi Holding AS | | 2020 |
| Berger Nordre Ans | Real estate | 2012 |
| Berger Servicesenter AS | Wholesale & retail | 2005 |
| Berger Vekstjord AS | Construction | 2024 |
| Bernhard L. Engros AS | Wholesale & retail | 1975 |
| Best Invest AS | Professional & scientific | 1995 |
| BFK Invest AS | Real estate | 2020 |
| Bildata AS | Other services | 2021 |
| Bilsenteret Øst AS | Wholesale & retail | 2025 |
| Bilservice Eiendom AS | Other services | 2002 |
| Bilservice Gruppen AS | Other services | 2011 |
| Bim AS | Real estate | 2020 |
| Biovac Environmental Technology AS | Construction | 2003 |
| Bizet Dønnum AS | Arts & recreation | 2025 |
| BKR Holding AS | | 2019 |
| Blikkenslager Tor Atle Kildal AS | Construction | 2013 |
| BMF Entreprise AS | Construction | 2018 |
| Boj Eiendom AS | Real estate | 1978 |
| Bolig Harmoni AS | Real estate | 2024 |
| Bolig Og Næringsservice AS | Administrative & support | 2018 |
| Boltve AS | Real estate | 2021 |
| Borgheim Bygg AS | Real estate | 2023 |
| BPM Invest AS | Financial services | 2017 |
| Brennsund Holding AS | Real estate | 1997 |
| Briskeby Trafikkskole AS | Education | 2026 |
| Brusletta Barnehage SA | Education | 2000 |
| BSM Holding AS | Real estate | 2014 |
| Bukken Invest AS | | 2022 |
| Bulktransport Øst AS | Transport & logistics | 2025 |
| Busch Eloxal AS | Manufacturing | 1987 |
| Bygg Kontroll Og Prosjektering AS | Construction | 2024 |
| Bygg Og Eiendom Rørservice AS | Construction | 2023 |
| Bøøs Eiendom AS | Real estate | 2025 |
| Carup II AS | | 2020 |
| Cavex AS | Wholesale & retail | 2025 |
| Cd-Profil Da | Manufacturing | 1998 |
| Cemtech AS | Professional & scientific | 2003 |
| Chanca Holding AS | | 2019 |
| Christiania Stillas AS | Construction | 2002 |
| Christiania Stillas Holding AS | Construction | 2005 |
| CJ Consulting SA | Professional & scientific | 2019 |
| Cleanpro AS | Wholesale & retail | 2004 |
| Co Co AS | Hospitality | 2025 |
| Convenzy AS | Information & communication | 2025 |
| Cormedic AS | Health & social care | 2021 |
| Cupo AS | Information & communication | 2020 |
| Cupo Limited Nuf | Information & communication | 2010 |
| Cygnus Data AS | Information & communication | 2021 |