| 360 Invest AS | | 2023 |
| 3D Visualisering Og Design AS | Professional & scientific | 2018 |
| A-J Holding AS | | 1988 |
| A-Pe Holding AS | Financial services | 2018 |
| A. Stokke Consulting AS | Professional & scientific | 2013 |
| A3 Invest AS | | 2017 |
| Aasheim Eiendom AS | Real estate | 2003 |
| Aaslien Eiendom AS | Real estate | 2011 |
| Aaslien Holding AS | Real estate | 2005 |
| Aasvangen Holding AS | Real estate | 2022 |
| AB Arkitekter AS | Professional & scientific | 2004 |
| Abc Fysioterapi AS | Health & social care | 2013 |
| Acina AS | Real estate | 2007 |
| Acm Capital AS | | 2025 |
| Adhd-Veilederen AS | Education | 2016 |
| Af Arntsen & Fallang Eiendom AS | Real estate | 1999 |
| Af Eiendomsutvikling AS | Real estate | 2024 |
| Akademiet Fredrikstad AS | Education | 2005 |
| Akea Invest AS | Professional & scientific | 2012 |
| Akre Consult AS | Professional & scientific | 2025 |
| Aksen Omsorg AS | Health & social care | 2024 |
| Aksjeselskapet CGK | Real estate | 1966 |
| Akstene Holding AS | Education | 2019 |
| Alida Invest AS | Construction | 2012 |
| ALL4REN AS | Administrative & support | 2019 |
| Amago AS | | 2018 |
| Ambient Food AS | Hospitality | 2024 |
| Ambiguus AS | Health & social care | 2004 |
| Amundsen Spesial Værstetorvet AS | Wholesale & retail | 2024 |
| Ana-Invest AS | Real estate | 2017 |
| Andreas Furuheim AS | Financial services | 2018 |
| Andreas Helgesen Holding AS | | 2024 |
| Andreks AS | Professional & scientific | 2025 |
| Anes Holding AS | Real estate | 2005 |
| Angard Kran Og Invest AS | Construction | 2026 |
| Anker-Hansen Holding AS | Real estate | 2020 |
| Ankerløkka Legesenter AS | Health & social care | 2021 |
| Ankerløkka Legesenter Da | Health & social care | 2009 |
| Ans Kråkerøy Kiosk | Wholesale & retail | 1989 |
| ANSO5 AS | Education | 2010 |
| Arne Glomdal Fotografi AS | Professional & scientific | 2014 |
| AS KLAUS HOLTGAARD Jr | Real estate | 1970 |
| Ask Møller Eiendomsmegling AS | Real estate | 2009 |
| Askot AS | Real estate | 2007 |
| Astma Og Allergiklinikken AS | Health & social care | 2020 |
| Atplay AS | Professional & scientific | 2023 |
| Augeo AS | | 2025 |
| Avante Holding AS | Real estate | 2018 |
| Avj Holding AS | | 2022 |
| Avlastningstjenesten Ans | Health & social care | 1989 |
| B-Home Holding AS | Real estate | 2023 |
| B. Lossius Holding AS | | 2025 |
| Bajas Eiendom AS | Real estate | 2021 |
| Bakfickan Slippen AS | Wholesale & retail | 2016 |
| Baluba AS | Agriculture & fishing | 2015 |
| Bappe Invest AS | | 2023 |
| Bar 1903 AS | Hospitality | 2024 |
| Bare Bucha AS | Manufacturing | 2026 |
| Barkedalen AS | Construction | 2018 |
| Barkedalen Elektriske AS | Construction | 2023 |
| Barlien Holding AS | Real estate | 2011 |
| Barm Bygg AS | Construction | 2022 |
| Barværste AS | Hospitality | 2023 |
| Baza Holding AS | Wholesale & retail | 2021 |
| Beauty Selection AS | Wholesale & retail | 2016 |
| Beco Invest AS | Real estate | 2012 |
| Beco Reklame AS | Manufacturing | 2013 |
| Bellmann AS | Financial services | 2014 |
| Berge Investment AS | Real estate | 2018 |
| Bergs Boligbygg AS | Construction | 1990 |
| Bertel AS | Professional & scientific | 1990 |
| Berthelsen Sailing AS | Education | 2012 |
| Biffen.No AS | Wholesale & retail | 2025 |
| Bjar Arkitekter AS | Professional & scientific | 1998 |
| Bjarconsult AS | Professional & scientific | 2023 |
| Bjæring Invest AS | | 2020 |
| Bjølstad Brygge AS | Professional & scientific | 1990 |
| Bjølstad Bygård AS | Real estate | 2022 |
| Bjølstad Bygård Tomt AS | Real estate | 2023 |
| Bjølstad Eiendom AS | Real estate | 2005 |
| Bjørlien Eiendom AS | Real estate | 2016 |
| Blomsterøya Barnehage SA | Education | 1989 |
| Blomsterøya Frisør AS | Other services | 2024 |
| Bookman AS | Real estate | 2018 |
| Borg Eiendom AS | Real estate | 1985 |
| Borg Elektro AS | Construction | 2022 |
| Borg Medical AS | Health & social care | 2015 |
| Borg Revisjon AS | Professional & scientific | 2023 |
| Botek Norge AS | Real estate | 1992 |
| Bouancy AS | Real estate | 2005 |
| Boysen Eiendom AS | Real estate | 1997 |
| Boysen Invest AS | Real estate | 1999 |
| Brekom AS | Professional & scientific | 2024 |
| Briis Invest AS | Financial services | 2005 |
| Bringa Arntsen Holding AS | | 2024 |
| Bringa Haaland AS | | 2024 |
| Bringsrud Holding AS | Professional & scientific | 2021 |
| Brocks Engineering AS | Professional & scientific | 2012 |
| Bror Sander Norli Holding AS | | 2025 |
| Brosteinen AS | | 2026 |