| Athino AS | Information & communication | 2026 |
| Athleritage AS | Wholesale & retail | 2026 |
| Athlete Growth Sport AS | Health & social care | 2024 |
| Athletes & Founders AS | | 2025 |
| Athletes for Farming AS | Education | 2013 |
| Athomstart Invest 1006 AS | | 2024 |
| Athomstart Invest 1007 AS | | 2024 |
| Athomstart Invest 1011 AS | | 2025 |
| Athomstart Invest 1012 AS | | 2025 |
| Athomstart Invest 1047 AS | | 2025 |
| Athomstart Invest 1048 AS | | 2025 |
| Athomstart Invest 1049 AS | | 2025 |
| Athomstart Invest 1050 AS | | 2025 |
| Athomstart Invest 1059 AS | | 2025 |
| Athomstart Invest 1096 AS | | 2026 |
| Athomstart Invest 1097 AS | | 2026 |
| Athomstart Invest 1104 AS | | 2026 |
| Athomstart Invest 1105 AS | | 2026 |
| Athomstart Invest 1116 AS | Real estate | 2026 |
| Athomstart Invest 1119 AS | Real estate | 2026 |
| Athomstart Invest 1122 AS | Real estate | 2026 |
| Athomstart Invest 1123 AS | Real estate | 2026 |
| Athomstart Invest 1129 AS | | 2026 |
| Athomstart Invest 1131 AS | | 2026 |
| Athomstart Invest 1132 AS | | 2026 |
| Athomstart Invest 1133 AS | | 2026 |
| Athomstart Invest 1135 AS | | 2026 |
| Athomstart Invest 1140 AS | Real estate | 2026 |
| Athomstart Invest 1142 AS | | 2026 |
| Athomstart Invest 957 AS | | 2024 |
| Athomstart Invest 999 AS | | 2024 |
| Athos Capital AS | Professional & scientific | 2017 |
| Athos Investment AS | | 2020 |
| Ati Holding AS | Real estate | 2010 |
| Atia Gruppen AS | Administrative & support | 2025 |
| Atia Helse AS | Administrative & support | 2025 |
| Atia Pharma AS | Wholesale & retail | 2020 |
| Atic Bemanning Da | Administrative & support | 2009 |
| Atida AS | Information & communication | 2026 |
| Atinu AS | Real estate | 1997 |
| Atiqs AS | Real estate | 2016 |
| Atiqs Entreprenør AS | Real estate | 2023 |
| Atir Khan AS | Real estate | 2020 |
| Atit Invest AS | Financial services | 2015 |
| Atium AS | | 2013 |
| Atk Lingua AS | Professional & scientific | 2025 |
| Atlant Finans AS | | 2022 |
| Atlant Invest AS | | 2022 |
| Atlanter KTP AS | Real estate | 2015 |
| Atlantic Consulting AS | Professional & scientific | 2023 |
| Atlantic Continental AS | Real estate | 2005 |
| Atlantic Crossing Production AS | Information & communication | 2018 |
| Atlantic Feeder III AS | Administrative & support | 2024 |
| Atlantic Feeder IV AS | Administrative & support | 2025 |
| Atlantic Gas III AS | Transport & logistics | 2022 |
| Atlantic Management Group AS | Professional & scientific | 2018 |
| Atlantic Minibulk AS | Transport & logistics | 2006 |
| Atlantic Panamax 1 AS | Transport & logistics | 2014 |
| Atlantic Panamax 2 AS | Transport & logistics | 2015 |
| Atlantic Trading Company Norway AS | | 2003 |
| Atlantica AS | Transport & logistics | 1996 |
| Atlantica Carrier AS | Transport & logistics | 2023 |
| Atlantica Duke AS | Transport & logistics | 2022 |
| Atlantica Pioneer AS | Transport & logistics | 2024 |
| Atlantica Power AS | Transport & logistics | 2024 |
| Atlantica PSV AS | Transport & logistics | 2023 |
| Atlantica Rederi AS | Transport & logistics | 2017 |
| Atlantica Server AS | Transport & logistics | 2022 |
| Atlantica Ship Invest AS | Transport & logistics | 2007 |
| Atlantica Shipping AS | Transport & logistics | 2022 |
| Atlantica Star AS | Transport & logistics | 2025 |
| Atlantica Sun AS | Transport & logistics | 2025 |
| Atlantica Supplier AS | Transport & logistics | 2021 |
| Atlantica Tender Drilling Ltd. | | 2012 |
| Atlantica Trader AS | Transport & logistics | 2022 |
| Atlantico Norte Holding AS | Transport & logistics | 2005 |
| Atlantis Event AS | Hospitality | 2017 |
| Atlantis Group AS | | 2022 |
| Atlantis Invest AS | Financial services | 2015 |
| Atlantis Reiser AS | Administrative & support | 2002 |
| Atlas Alpha AS | Real estate | 2021 |
| Atlas AS | Information & communication | 2021 |
| Atlas Bar AS | Hospitality | 2025 |
| Atlas Bolig AS | Real estate | 2020 |
| Atlas Bygg AS | Construction | 2025 |
| Atlas Capital AS | | 2022 |
| Atlas Catering AS | Hospitality | 2015 |
| Atlas Consulting Investment Holding Limited | | 2022 |
| Atlas Consulting Investment Limited | Real estate | 2020 |
| Atlas Dagligvare 1 AS | Real estate | 2021 |
| Atlas Dagligvare 10 AS | Real estate | 2026 |
| Atlas Dagligvare 11 AS | Real estate | 2026 |
| Atlas Dagligvare 12 AS | Real estate | 2026 |
| Atlas Dagligvare 2 AS | Real estate | 2024 |
| Atlas Dagligvare 3 AS | Real estate | 2025 |
| Atlas Dagligvare 4 AS | Real estate | 2025 |
| Atlas Dagligvare 5 AS | Real estate | 2025 |
| Atlas Dagligvare 6 AS | Real estate | 2025 |
| Atlas Dagligvare 8 AS | Real estate | 2026 |
| Atlas Dagligvare 9 AS | Real estate | 2026 |