| 3A Eiendom 1 AS | Real estate | 2013 |
| 3A Eiendom 2 AS | Real estate | 2013 |
| 3A Eiendom 3 AS | Real estate | 2013 |
| 3A Eiendom 4 AS | Real estate | 2013 |
| 3A Eiendom AS | Real estate | 2018 |
| A-Bra AS | Real estate | 2005 |
| A-Kabel AS | Manufacturing | 1991 |
| A. Jahr AS | Real estate | 2020 |
| Aanerud Bakeri AS | Manufacturing | 2001 |
| Aarnes Eiendom AS | Real estate | 1988 |
| Aarnes Winery AS | Real estate | 2025 |
| Aaserud & Sundquist Billakkering Ans | Real estate | 1989 |
| Aasgaard AS | Wholesale & retail | 1992 |
| Abacta AS | Real estate | 2004 |
| Abc Utleie Norge AS | Administrative & support | 2022 |
| Adprosjekt AS | Construction | 2019 |
| Advokatfirmaet Røseid, Tønsberg & Karlstad AS | Professional & scientific | 2011 |
| Ag-Service AS | Transport & logistics | 2017 |
| Agat Regnskap Ans | Professional & scientific | 1986 |
| Aglo Holding AS | Administrative & support | 2017 |
| Agricultura Da | Agriculture & fishing | 2013 |
| Agro Navigering AS | Wholesale & retail | 2023 |
| Ah Transport AS | Transport & logistics | 2015 |
| Aida Roads AS | Transport & logistics | 2018 |
| Ak Rådgivning AS | Real estate | 2015 |
| Akele AS | Professional & scientific | 2011 |
| Akershus Boligvurdering AS | Professional & scientific | 2010 |
| Akershus Totalentreprenør AS | Construction | 2024 |
| Aktant AS | Information & communication | 2016 |
| Alba Marie Holding AS | | 2019 |
| ALBUM2.COM AS | Information & communication | 2013 |
| Alexandra Kontor Og Service AS | Administrative & support | 2009 |
| Alfa Trafikkskole AS | Education | 1994 |
| Alfanor 26017 AS | Manufacturing | 2026 |
| All 2 AS | Wholesale & retail | 2007 |
| Altistål AS | Wholesale & retail | 2025 |
| Amina AS | Hospitality | 2023 |
| Anders BM Holding AS | | 2018 |
| Aner AS | Professional & scientific | 2021 |
| Aner Holding AS | Real estate | 2013 |
| Annen Etage Frisør AS | Other services | 2022 |
| Apotekgården Legesenter AS | Health & social care | 2016 |
| Arbtek AS | Construction | 2014 |
| Arctic Trafikkskole AS | Education | 2022 |
| AS Gull | Wholesale & retail | 1987 |
| Atletico Neshallen AS | Other services | 2017 |
| Auli Vest AS | Real estate | 2022 |
| Aulie Holding AS | Construction | 2023 |
| Auto Contact Ans | Wholesale & retail | 1998 |
| Auto Season AS | Wholesale & retail | 2023 |
| Autohans AS | Wholesale & retail | 2009 |
| Automasjons Og Styringssystemer AS | Information & communication | 1996 |
| Automobilhallen AS | Other services | 2017 |
| B.E Fredriksen AS | Transport & logistics | 2024 |
| Babo Norge AS | Wholesale & retail | 1997 |
| Bakken-Flaathe AS | Wholesale & retail | 2020 |
| Balkra AS | Construction | 2022 |
| Barhaughøgda Holding AS | Real estate | 2012 |
| Bartoldy Transport AS | Transport & logistics | 2018 |
| BB Teltutleie Da | Administrative & support | 2015 |
| Becca Eiendomsutvikling AS | Real estate | 2017 |
| Bedrifts-Assistanse AS | Professional & scientific | 1988 |
| Begravelsesbyrå Nilsen AS | Other services | 2009 |
| Bergersen Bygg AS | Construction | 2016 |
| Beth Eiendom AS | Real estate | 2004 |
| Biba AS | | 2025 |
| Bil Og Atv Verksted AS | Other services | 2022 |
| Bildiagnose AS | Other services | 2026 |
| Bioguard Miljøprodukter AS | Wholesale & retail | 2012 |
| Bjerknes Kristiansen Holding AS | | 2020 |
| BK Montasje AS | Construction | 2023 |
| Blikkenslager Walter Fritz AS | Construction | 2015 |
| Blueboot R&D AS | Information & communication | 2022 |
| BM Maskin AS | Construction | 2005 |
| Bm-Eiendom AS | Real estate | 2012 |
| BN Konsult AS | Professional & scientific | 2022 |
| BNR Bygg AS | Construction | 2024 |
| Boinvest AS | Real estate | 2005 |
| Bolette & Lauritz AS | Wholesale & retail | 2020 |
| Bre-Eiendom AS | Real estate | 2001 |
| Brecom AS | Wholesale & retail | 2008 |
| Breen Invest AS | Wholesale & retail | 2007 |
| Brillian Group AS | Information & communication | 1996 |
| Bråthen Eiendom AS | Real estate | 1989 |
| Brødrene Søgård AS | Construction | 2006 |
| Buchla Holding AS | | 2022 |
| Bunkern AS | Real estate | 2014 |
| Bygg Og Graveteknikk AS | Construction | 2025 |
| Byggnor Solås AS | Construction | 2021 |
| Båt Elektro Service AS | Manufacturing | 2020 |
| C.P. Consult AS | Administrative & support | 2011 |
| Campfire Travel AS | Administrative & support | 2019 |
| Carl Øistein Grue AS | Construction | 1998 |
| CB Bio Norge AS | Wholesale & retail | 2023 |
| Christian Jæger AS | Construction | 2014 |
| Concreto Transport AS | Transport & logistics | 2025 |
| Connectionz AS | Wholesale & retail | 2025 |
| CPK Holding AS | | 2025 |
| Customer Service AS | Construction | 2017 |
| Dahls Grill Årnes AS | Hospitality | 2013 |