| Alto AS | Real estate | 2022 |
| Alto Bil AS | Administrative & support | 2023 |
| Alto Capital AS | Information & communication | 2022 |
| Alto Consulting AS | Information & communication | 2023 |
| Altor AS | Real estate | 1990 |
| Altor Equity Partners AS | Professional & scientific | 2004 |
| Altor Invest 10 AS | | 2024 |
| Altor Invest 11 AS | | 2024 |
| Altor Invest 5 AS | Financial services | 2018 |
| Altor Invest 6 AS | Financial services | 2018 |
| Altor Invest 7 AS | | 2022 |
| Altor Invest 8 AS | | 2023 |
| Altor Invest 9 AS | Real estate | 2023 |
| Altoros Norge AS | Information & communication | 2009 |
| Altrad Stellingbouw Balliauw NV | Administrative & support | 2009 |
| Altro AS | Information & communication | 2022 |
| Altrostile AS | Wholesale & retail | 2019 |
| Altum Census AS | | 2003 |
| Altura Invest AS | | 2026 |
| Altus Pulsus AS | Arts & recreation | 2006 |
| Altvitalt AS | Health & social care | 2006 |
| Altym AS | Manufacturing | 2021 |
| Altø AS | Wholesale & retail | 2025 |
| Aludra AS | Real estate | 2004 |
| Alula AS | Real estate | 2017 |
| Alumi Ans | Information & communication | 1989 |
| Aluna Nova Forlag AS | Information & communication | 2025 |
| Alund Holding AS | Professional & scientific | 2005 |
| Alunde Invest AS | | 2026 |
| Alundo Invest AS | Real estate | 2019 |
| Alura AS | Wholesale & retail | 2013 |
| Aluventa A/S Nuf | Wholesale & retail | 2022 |
| Aluwini Holding AS | Education | 2022 |
| Alv AS | Information & communication | 2019 |
| Alv Consulting AS | Information & communication | 2025 |
| Alv Management Consulting AS | Information & communication | 2025 |
| Alv Skogstad Aamo AS | | 2014 |
| Alva AS | Wholesale & retail | 1964 |
| Alva Holding AS | | 2024 |
| Alva Labs AS | Information & communication | 2022 |
| Alva Technologies AS | Professional & scientific | 2024 |
| Alva Trading AS | Real estate | 1986 |
| Alvalde AS | Real estate | 2014 |
| Alvand AS | Information & communication | 2023 |
| Alvarez & Marsal Norway AS | Professional & scientific | 2019 |
| Alvarium Invest AS | | 2025 |
| Alvatross Holding AS | Real estate | 2022 |
| Alve AS | | 2023 |
| Alvela Norden AS | Professional & scientific | 2021 |
| Alvemarine AS | Wholesale & retail | 2011 |
| Alveng Holding AS | Financial services | 2013 |
| Alveolen Medisinske Selskap AS | Health & social care | 1999 |
| Alveskog Holding AS | Financial services | 2021 |
| Alvesta Systems AS | Information & communication | 2026 |
| Alvestad Holdco AS | Manufacturing | 2026 |
| Alvestad Marin AS | Manufacturing | 2003 |
| Alviga AS | | 2025 |
| Alvimveien 54 AS | Real estate | 2019 |
| Alvin Invest AS | Financial services | 2008 |
| Alvinus Invest AS | | 2019 |
| Alvis Ekosystem Limited | Real estate | 2021 |
| Alvitor AS | Information & communication | 2001 |
| Always Connecting AS | Information & communication | 2018 |
| Always Holding AS | | 2019 |
| Always Technologies AS | | 2023 |
| Alwido AS | Real estate | 2007 |
| Alwo Holding AS | Information & communication | 2022 |
| Alx Bygg AS | Construction | 2018 |
| Alyata AS | Professional & scientific | 2000 |
| Alyco Invest AS | | 2024 |
| Alyla AS | Real estate | 1988 |
| Alzinagroup AS | Real estate | 2007 |
| Am Beauty Studio AS | Other services | 2025 |
| Am Braathen Holding AS | | 2019 |
| Am Domener 1 Da | Information & communication | 2006 |
| Am Domener 2 Da | Administrative & support | 2006 |
| Am Domener 3 Da | Administrative & support | 2006 |
| Am Domener 4 Da | Information & communication | 2007 |
| Am Eiendom AS | Real estate | 2004 |
| Am Elektrokompetanse AS | Education | 2019 |
| Am Equity AS | | 2023 |
| Am Holding AS | Financial services | 2005 |
| Am Integrering AS | Arts & recreation | 2025 |
| Am Interest AS | Financial services | 2006 |
| Am Invest AS | Real estate | 2021 |
| Am Investment AS | Real estate | 1976 |
| Am Investment Group Ans | Wholesale & retail | 2025 |
| Am Kiropraktikk AS | Health & social care | 2016 |
| Am Maling Og Vedlikehold AS | Construction | 2018 |
| Am Montering AS | Construction | 2019 |
| Am Oppstart AS | | 2022 |
| Am Palencia Holding AS | | 2020 |
| Am PM Brands AS | Wholesale & retail | 2023 |
| Am Recovery AS | | 2019 |
| Am Seven Holding AS | Financial services | 2008 |
| Am Skin Clinic AS | Other services | 2026 |
| Am Wegger Konsult AS | Professional & scientific | 2011 |
| Ama Capital AS | | 2023 |
| Ama Group Holding AS | Wholesale & retail | 2015 |
| Ama Invest AS | Wholesale & retail | 2004 |