| Avantor Gullhaug Torg 1 AS | Real estate | 2016 |
| Avantor Gullhaug Torg 2A AS | Real estate | 2006 |
| Avantor Gullhaug Torg 5 AS | Real estate | 2006 |
| Avantor Nydalen Allé 37 AS | Real estate | 2006 |
| Avantor Nydalsveien 12 AS | Real estate | 2019 |
| Avantor Nydalsveien 18 Og 24 AS | Real estate | 2019 |
| Avantor Nydalsveien 21 AS | Real estate | 2006 |
| Avantor Nydalsveien 28 AS | Real estate | 2012 |
| Avantor Nydalsveien 30A AS | Real estate | 2006 |
| Avantor Nydalsveien 30B AS | Real estate | 2006 |
| Avantor Nydalsveien 32B AS | Real estate | 2006 |
| Avantor Nydalsveien 33 AS | Real estate | 2006 |
| Avantor P N12-26 AS | Real estate | 2006 |
| Avantor Parkering AS | Real estate | 2002 |
| Avantor Sandakerveien 113-119 AS | Real estate | 2002 |
| Avantor Sandakerveien 128 AS | Real estate | 2006 |
| Avantor Vitaminveien 5B AS | Real estate | 2006 |
| Avanza Strategica AS | Professional & scientific | 2020 |
| Avanzar Bygg Og Eiendom AS | Professional & scientific | 2025 |
| Avanzar Ecotransport AS | Transport & logistics | 2026 |
| Avanzare Capital AS | | 2023 |
| Avanzus AS | Information & communication | 2013 |
| Avaria Equity AS | | 2017 |
| Avaris Holding AS | Professional & scientific | 2023 |
| Avarn Manco AS | Financial services | 2021 |
| Avarn Security AS | Administrative & support | 1987 |
| Avarn Security Group AS | Administrative & support | 2021 |
| Avarn Security Group Holding AS | Administrative & support | 2021 |
| Avarn Security Group Invest AS | Administrative & support | 2021 |
| Avarn Security Holding AS | Administrative & support | 2015 |
| Avask Matter Og Mopper AS | Other services | 2023 |
| Avaso Technology Solutions AS | Information & communication | 2022 |
| Avatech Ans | Manufacturing | 1999 |
| Avax Holding SA | Manufacturing | 2006 |
| Avaya Norway AS | Information & communication | 2006 |
| Avb Scientific AS | Professional & scientific | 2019 |
| Avbrekk Utvikling AS | Professional & scientific | 2022 |
| Avc AS | Wholesale & retail | 2008 |
| Avco AS | Financial services | 2005 |
| Avd Kompass Invest AS | | 2019 |
| Avd Servers Limited | Real estate | 2021 |
| Avdeling Bjølsen Kolonial AS | Wholesale & retail | 2013 |
| Avdeling Skillebekk AS | Real estate | 2026 |
| Avdeling Toftes Gate Kolonial AS | Wholesale & retail | 2012 |
| Avdeling Torshovgata 3 AS | Real estate | 2024 |
| Avdeling Ullevålsveien AS | Real estate | 2022 |
| Avdn AS | | 2019 |
| Ave Capital AS | Real estate | 2025 |
| Ave Holding AS | Arts & recreation | 2014 |
| Ave Invest AS | Financial services | 2005 |
| Ave Regor AS | | 2025 |
| Ave Trebua AS | Professional & scientific | 2011 |
| Avea Utvikling AS | Hospitality | 2022 |
| Avec AS | Professional & scientific | 2012 |
| Avelia AS | | 2019 |
| Avelia Holding AS | Wholesale & retail | 2021 |
| Avella AS | Information & communication | 2007 |
| Avema Holding AS | | 2025 |
| Aven Kapital 2 AS | | 2025 |
| Aven Kapital AS | | 2023 |
| Avenel Holding AS | | 2025 |
| Avenida AS | Real estate | 2000 |
| Avenor Finans AS | Financial services | 2024 |
| Avensia AS | Information & communication | 2019 |
| Avensia Information Management AS | Information & communication | 2025 |
| Aventa Tech AS | Information & communication | 2017 |
| Aventi Installation AS | Construction | 2014 |
| Aventi Norway AS | Real estate | 2014 |
| Aventi Solutions Norge AS | Administrative & support | 2019 |
| Aventi Technology AS | Professional & scientific | 1986 |
| Aventine Holding AS | Financial services | 2014 |
| Aventron Norway AS | Energy | 2014 |
| Aventura AS | | 2021 |
| Avenue Investment AS | Hospitality | 1999 |
| Aveon Studios AS | Arts & recreation | 2015 |
| Averna AS | Arts & recreation | 2020 |
| Averstadmoen 11 AS | Real estate | 2020 |
| Avestco AS | | 2026 |
| Avfall Bortkjøring Og Containerutleie AS | Transport & logistics | 1989 |
| Avgerinos AS | | 2023 |
| Avh Holding AS | Real estate | 2010 |
| Avi-Rep AS | Real estate | 2005 |
| Avia Performance AS | Professional & scientific | 2014 |
| Avia Produksjon AS | Information & communication | 2014 |
| Aviareps AS | Transport & logistics | 1993 |
| Aviation Capital AS | Administrative & support | 2021 |
| Aviation Fuelling Services Norway AS | Wholesale & retail | 2015 |
| Aviation Resources Oslo AS | Education | 2015 |
| Aviato Cap AS | Real estate | 2021 |
| Avid Technology Norway AS | | 2024 |
| Avida Helse AS | Health & social care | 2026 |
| Avidit AS | Construction | 2005 |
| Avidly Norway AS | Professional & scientific | 2017 |
| Avigdor Holding AS | Professional & scientific | 2024 |
| Avik Holding AS | | 2018 |
| Avimar Eiendom AS | Administrative & support | 1999 |
| Avinor AS | Transport & logistics | 2002 |
| Avinor Flysikring AS | Transport & logistics | 2014 |
| Avinor Utvikling AS | Real estate | 2014 |
| Avinto AS | Information & communication | 2024 |