| Airthings Group AS | | 2026 |
| Airtox Norway AS | Wholesale & retail | 2020 |
| Airvenue.Io AS | Information & communication | 2016 |
| Airwatch AS | Professional & scientific | 2014 |
| Ais Invest AS | | 2021 |
| Aisa Eiendom AS | Real estate | 2012 |
| Aisa Invest AS | | 2024 |
| Aisha Kausar AS | Health & social care | 2026 |
| Ait Foods AS | Wholesale & retail | 2025 |
| Ait Group AS | Wholesale & retail | 2024 |
| Ait Holding AS | Financial services | 2021 |
| Ait Invest AS | | 2026 |
| Aita AS | Professional & scientific | 2011 |
| Aita Invest AS | | 2026 |
| Aita Kurs AS | Education | 2018 |
| Aiteq AS | Information & communication | 2019 |
| Aitgroup AS | Professional & scientific | 2024 |
| Aivida AS | Information & communication | 2026 |
| Aivida Holding AS | | 2026 |
| Aivorya AS | Information & communication | 2026 |
| Aiwa Rental AS | Administrative & support | 2021 |
| Aix Studio AS | Professional & scientific | 2022 |
| Aixalda Limited | Real estate | 2021 |
| Aj & SP Rådgivning AS | Financial services | 2023 |
| Aj Bygg Og Eiendom AS | Real estate | 2017 |
| Aj Byggkonsult AS | Professional & scientific | 2019 |
| Aj Capital AS | Financial services | 2007 |
| Aj Forvaltning AS | | 2026 |
| Aj Golden AS | Transport & logistics | 2023 |
| Aj Handyman AS | Administrative & support | 2016 |
| Aj Holding & Invest AS | Real estate | 2007 |
| Aj Investment AS | | 2023 |
| Aj Schouten AS | Wholesale & retail | 2023 |
| Aj Trading AS | Wholesale & retail | 2010 |
| Aj Veiledning AS | Other services | 2015 |
| Aja Bygg & Håndverkertjenester AS | Construction | 2020 |
| Aja Invest AS | Financial services | 1986 |
| Ajabu AS | Information & communication | 2020 |
| Ajak Invest AS | Wholesale & retail | 2005 |
| Ajama AS | Professional & scientific | 2024 |
| Ajd Invest AS | | 2024 |
| Aje Production AS | | 2020 |
| Ajedrima AS | | 2021 |
| Ajer Holding AS | Real estate | 2020 |
| Ajh AS | | 2025 |
| Ajh Invest AS | | 2022 |
| Ajjaji Holding AS | | 2019 |
| Ajk Investments AS | Financial services | 2015 |
| Ajkj Holding AS | | 2026 |
| Ajmkkm Invest AS | | 2024 |
| Ajnj AS | | 2020 |
| Ajoli Ans | Information & communication | 2006 |
| Ajour Grafisk AS | Manufacturing | 1998 |
| Ajs Invest AS | Professional & scientific | 2005 |
| Ajs Proaktiv AS | Construction | 2020 |
| Ajskrede Invest AS | | 2024 |
| Ajy Holding AS | | 2026 |
| Ajz AS | Financial services | 2020 |
| Ak 2 Invest AS | | 2020 |
| Ak Anthi AS | | 2024 |
| Ak Betong AS | Construction | 2005 |
| Ak Booker AS | Other services | 2020 |
| Ak Bud Og Transport AS | Transport & logistics | 2015 |
| Ak Bygg Og Service AS | Construction | 2018 |
| Ak Drift AS | | 2023 |
| Ak Eiendom Ans | Real estate | 1989 |
| Ak Fotterapi AS | Other services | 2019 |
| Ak Horstad Holding AS | | 2025 |
| Ak Jensen Investment Management Limited Nuf | Administrative & support | 2021 |
| Ak Jensen Limited Nuf | Professional & scientific | 2006 |
| Ak Jensen Norway AS | Financial services | 2020 |
| Ak Malerfirma AS | Construction | 2019 |
| Ak Music AS | Arts & recreation | 2019 |
| Ak Nordic Nuf | Financial services | 2005 |
| Ak Norge Wic AS | Health & social care | 2012 |
| Ak Oppussing Og Interiør AS | Construction | 2025 |
| Ak Oslo Holding AS | Financial services | 2015 |
| Ak Renovering AS | Construction | 2025 |
| Ak Selskap AS | Wholesale & retail | 2017 |
| Ak Shipping & Chartering AS | Transport & logistics | 2013 |
| Ak Sikkerhet AS | Administrative & support | 2024 |
| Ak Sko AS | Wholesale & retail | 2021 |
| Ak Stang AS | Real estate | 2006 |
| Ak Stang Eiendom AS | Real estate | 2014 |
| Ak Transport Group AS | Transport & logistics | 2025 |
| Ak Økonomi AS | Financial services | 2006 |
| Ak-Gruppen AS | Construction | 2023 |
| Ak-Gruppen Holding AS | Construction | 2023 |
| Ak-Maling AS | Construction | 2024 |
| Ak. Grieg Norge AS | Manufacturing | 2005 |
| AK1 Elektro AS | Construction | 2018 |
| AK9195 Holding AS | | 2023 |
| Aka Import Eksport Ans | | 1992 |
| Akab Bygg AS | Construction | 2019 |
| Akab Entreprenør AS | Construction | 2020 |
| Akademiet for Kunstig Intelligens AS | | 2024 |
| Akademiet Norsk Restaurantskole Drift AS | Hospitality | 2017 |
| Akademiet Oslo AS | Education | 2004 |
| Akademiet Realfagsskole Oslo AS | Education | 2013 |
| Akademiet Utveksling AS | Professional & scientific | 2012 |