| Akersund Beta AS | Real estate | 2008 |
| Akersveien 1 PC AS | | 2020 |
| Akersveien 19 AS | Real estate | 1998 |
| Akersveien 21 Ans | Real estate | 2018 |
| Akersveien 23 Ans | Real estate | 2018 |
| Akersveien 26 AS | Real estate | 2006 |
| Akersveien Eiendomsinvest AS | Real estate | 2014 |
| Akersveien Holding AS | | 2019 |
| Akersveien Utvikling AS | Real estate | 2019 |
| Aketo MB AS | Professional & scientific | 2025 |
| Aketo RF AS | Professional & scientific | 2022 |
| Akgt Holding AS | Professional & scientific | 2012 |
| Akh Gruppen AS | Construction | 2006 |
| Akh Invest AS | Real estate | 2012 |
| Akhold AS | | 2024 |
| Akhtar Je AS | Real estate | 1991 |
| Aki Invest AS | | 2021 |
| Aki Transport AS | Transport & logistics | 2023 |
| Akigai AS | Professional & scientific | 2022 |
| Akilles Fysioterapi AS | Health & social care | 2023 |
| Akilles Holding AS | | 2020 |
| Akilles Invest AS | | 2019 |
| Akilles Salong AS | Other services | 2017 |
| Akilles Salong Sæter AS | Other services | 2022 |
| Akj Pe AS | Information & communication | 2008 |
| Akk Eiendom AS | Real estate | 2018 |
| Akk Investment AS | Real estate | 2018 |
| Akka Arabisk Espresso AS | Hospitality | 2001 |
| Akka Invest 1 AS | Real estate | 2015 |
| Akkodis Norway AS | Administrative & support | 1988 |
| Akkord Bygg AS | Construction | 2012 |
| Akkord Drive AS | Transport & logistics | 2020 |
| Akkumulator AS | Real estate | 1989 |
| Akkvir AS | Professional & scientific | 2014 |
| Akle Invest AS | | 2024 |
| Akli Transport AS | Transport & logistics | 2022 |
| Aklo Rådgivning AS | Professional & scientific | 2025 |
| Akmelhus Holding AS | Administrative & support | 2017 |
| Ako Holding AS | | 2018 |
| Akol AS | Professional & scientific | 2005 |
| Akoya Invest AS | | 2003 |
| Akr Holding AS | Professional & scientific | 2014 |
| Akra AS | Professional & scientific | 2022 |
| Akram Transport AS | Transport & logistics | 2024 |
| Akrisios AS | Financial services | 2014 |
| Akrobat Invest AS | Financial services | 2006 |
| Akrobat Media Da | Information & communication | 2016 |
| Akropolis AS | | 2025 |
| Akropolis Holdings AS | | 2021 |
| Aks Capital AS | | 2024 |
| Aks Label AS | Wholesale & retail | 2020 |
| Aks Prosjekt AS | Professional & scientific | 1991 |
| Aksa Eiendom AS | Real estate | 2020 |
| Aksarben AS | Professional & scientific | 2019 |
| Aksdal Senter AS | Real estate | 2017 |
| Aksdal Senter Holding AS | Real estate | 2021 |
| Aksdal Sorland AS | | 2026 |
| Akse Hospitality AS | | 2022 |
| Aksel Gresvig AS | Real estate | 1957 |
| Aksel Helgeland AS | Information & communication | 2026 |
| Aksel Jermstad AS | Information & communication | 2013 |
| Akselberg Holding AS | | 2026 |
| Akselerasjon AS | | 2020 |
| Aksell AS | Manufacturing | 1968 |
| Akselsønn AS | | 2025 |
| Aksen B AS | Real estate | 2020 |
| Aksept Eiendomsmegling AS | Real estate | 2026 |
| Aksept Holding 2 AS | | 2026 |
| Akser AS | Information & communication | 2026 |
| Aksess AS | Administrative & support | 1990 |
| Aksess Regnskap AS | Professional & scientific | 1986 |
| Aksh Holding AS | | 2024 |
| Akshat IT AS | Information & communication | 2026 |
| Aksia AS | Real estate | 2001 |
| Aksikatu Invest AS | | 2023 |
| Aksion Revisjon AS | Professional & scientific | 2016 |
| Aksira AS | Professional & scientific | 2011 |
| Aksjefokus AS | Information & communication | 2026 |
| Aksjefonn AS | Real estate | 2021 |
| Aksjeklubben Guts & Glory AS | Financial services | 2017 |
| Aksjeresepsjonen AS | Financial services | 2012 |
| Aksjeselskapet Brinken | Households | 1938 |
| Aksjeselskapet Bygdø Alle 68 | Real estate | 1928 |
| Aksjeselskapet Centera | Financial services | 2011 |
| Aksjeselskapet Collettsgate 12 | Households | 1929 |
| Aksjeselskapet Dahm | Professional & scientific | 2020 |
| Aksjeselskapet Elektro Gruppen | Construction | 2006 |
| Aksjeselskapet Eugenies Gate 3A | Households | 1930 |
| Aksjeselskapet Filmprojeksjon | Professional & scientific | 2000 |
| Aksjeselskapet Geir Kristiansen AS | Real estate | 2020 |
| Aksjeselskapet Industrigaten 60 | Households | 1925 |
| Aksjeselskapet Industrigaten 63 | Households | 1927 |
| Aksjeselskapet Jørgen Løvlandsgate 25 | Households | 1936 |
| Aksjeselskapet Langaardsgate 1 | Households | 1930 |
| Aksjeselskapet Oscarsgate 76 | Real estate | 1950 |
| Aksjeselskapet Pirtel | Transport & logistics | 1991 |
| Aksjeselskapet Stensgaten 41 | Households | 1928 |
| Aksjeselskapet Thomas Heftyesgate NR 54 | Households | 1914 |
| Aksjeselskapet Vogtsgate 68/70 | Real estate | 1929 |
| Aksland Invest AS | | 2025 |