| 2 Snømenn AS | Construction | 2008 |
| 2M-INVEST AS | Real estate | 2007 |
| 2XHOLEN Consulting AS | Information & communication | 2016 |
| 4 Store AS | Hospitality | 2009 |
| 4U Holding AS | Real estate | 2019 |
| A. K. Rasmussen Invest AS | Financial services | 2008 |
| A.R Eiendom AS | Real estate | 2023 |
| A.R Holding AS | Real estate | 2022 |
| Aa Drosje AS | Transport & logistics | 2026 |
| Aban International Norway AS | Financial services | 2006 |
| Abba Seafood AB | | 2004 |
| Abc Bolig Invest AS | Real estate | 2020 |
| Abc Eiendom Service AS | Real estate | 2020 |
| Abc Sikkerhetsteknikk Ans | | 1990 |
| Accelerex AS | Wholesale & retail | 2022 |
| Adal Engineering AS | Professional & scientific | 2015 |
| Adepto AS | Real estate | 1997 |
| Adnevo AS | | 2026 |
| Adventures Consulting AS | Financial services | 2016 |
| Advokat Geir Frøholm AS | Professional & scientific | 2022 |
| Adwin AS | Information & communication | 2015 |
| Aero AS | Real estate | 2005 |
| Affinis Holding AS | Financial services | 2020 |
| Affittasi AS | Professional & scientific | 2022 |
| Agile Holding AS | Financial services | 2014 |
| Aksy Holding AS | | 2021 |
| Aktiv Økonomi Consult AS | Professional & scientific | 2000 |
| Albatross Eiendom AS | Real estate | 2000 |
| Albu Aktiv Norge AS | Construction | 2020 |
| Alexander Halvorsen AS | Information & communication | 2025 |
| Amaranza AS | Administrative & support | 2018 |
| Amc Consulting AS | Professional & scientific | 2014 |
| Amicus AS | Professional & scientific | 2023 |
| Amicus Investment AS | Professional & scientific | 2023 |
| Anahit AS | Information & communication | 2022 |
| Anders Aaberg Invest AS | | 2025 |
| Andersson Eiendom AS | | 2001 |
| Andre.No AS | Real estate | 2023 |
| Andreas J. Krogh Invest AS | Financial services | 2005 |
| Aob AS | | 2020 |
| Aprimo Rådgivning Martin Jensen AS | Professional & scientific | 2022 |
| Arcpro AS | Wholesale & retail | 2015 |
| Arh Invest AS | | 2023 |
| Arnt Hugo Lund AS | Real estate | 1990 |
| AS Rikebo | Real estate | 1990 |
| Asakveien 27 Eiendom AS | Wholesale & retail | 2012 |
| Aspri Consulting AS | Wholesale & retail | 2015 |
| Astec Aksjeselskap | Wholesale & retail | 1956 |
| Attolloo Group AS | | 2025 |
| AUTO1 Bilmegling AS | Wholesale & retail | 2020 |
| Automania Oppegård AS | Other services | 2017 |
| Automatik Ventiler System AS | Wholesale & retail | 1979 |
| Autoria Bil AS | Wholesale & retail | 2022 |
| Autoriagruppen AS | Wholesale & retail | 2022 |
| Autotec AS | Professional & scientific | 1982 |
| Aventra Capital AS | | 2026 |
| Avenuee AS | Professional & scientific | 2019 |
| Awa Holding AS | Financial services | 2005 |
| Axendo AS | Information & communication | 2019 |
| Babben Holding AS | Wholesale & retail | 2024 |
| Bad Boys Barber Shop AS | Other services | 2022 |
| Bare Kode AS | Information & communication | 2018 |
| Barejensa AS | | 2026 |
| Basic I AS | Information & communication | 2006 |
| Bava Invest AS | | 2023 |
| Beanbag AS | | 2025 |
| Beck Invest AS | Financial services | 2013 |
| Behandlerverket Kolbotn AS | Health & social care | 2014 |
| Bella Nova by Samaneh AS | Other services | 2025 |
| Bellatrix Holding AS | | 2025 |
| Bendix Empire Holding AS | | 2023 |
| Bente Løvberg AS | Hospitality | 2019 |
| Bentor Ans | Real estate | 2004 |
| Berger Energy AS | Professional & scientific | 2009 |
| Berket AS | Hospitality | 2023 |
| Beu Drift AS | Real estate | 2020 |
| BFK Sparing AS | | 2020 |
| BG Advice AS | Professional & scientific | 2025 |
| BGT1 Holding AS | Real estate | 2021 |
| Bjorndahl Holding AS | | 2023 |
| Bjørg Bøe AS | Arts & recreation | 2019 |
| Bjørnhytter AB | | 2005 |
| Black Swan Capital AS | | 2020 |
| Bolig & Eiendomsutvikling AS | Real estate | 2000 |
| Bolig Og Næringseiendom AS | Real estate | 2015 |
| Bonfire Holding AS | | 2020 |
| Bonif AS | Professional & scientific | 2025 |
| Bratli Invest AS | Real estate | 2018 |
| Brocco AS | | 1997 |
| Brunvoll Invest AS | Financial services | 2014 |
| Brødrene Sundts Byggeselskap AS | Real estate | 1969 |
| Bugge Investments AS | | 2025 |
| Butikkdrift Yildiz AS | Wholesale & retail | 2023 |
| Bygg Og Infrastruktur AS | Professional & scientific | 2024 |
| Byggon G AS | Construction | 2026 |
| Bygningsapotheket AS | Wholesale & retail | 2019 |
| Calip Invest AS | | 2022 |
| Caneias Ans | Real estate | 1989 |
| Caneias AS | Wholesale & retail | 2012 |
| Canita AS | Real estate | 2017 |