| Atlas Eiendom AS | Real estate | 2018 |
| Atlas Eiendom Holding AS | | 2025 |
| Atlas Elektro AS | Construction | 2005 |
| Atlas Engineering AS | Professional & scientific | 2013 |
| Atlas Facility Services AS | Administrative & support | 2015 |
| Atlas Frisør AS | Other services | 2018 |
| Atlas Garanti AS | Financial services | 2018 |
| Atlas Halal Kjøtt AS | Wholesale & retail | 2024 |
| Atlas Handel AS | Administrative & support | 2021 |
| Atlas Handel Holding AS | Real estate | 2024 |
| Atlas Handelsportefølje 1 Midco AS | Real estate | 2026 |
| Atlas Holdings AS | Hospitality | 2021 |
| Atlas Kompetanse AS | Education | 2015 |
| Atlas Living AS | Real estate | 2021 |
| Atlas Matimport AS | Wholesale & retail | 2025 |
| Atlas Nordic AS | Wholesale & retail | 2022 |
| Atlas North AS | Information & communication | 2026 |
| Atlas North Holding AS | | 2026 |
| Atlas Næring AS | Real estate | 2022 |
| Atlas Portefølje 1 AS | Real estate | 2021 |
| Atlas Portefølje 11 AS | Real estate | 2026 |
| Atlas Portefølje 12 AS | Real estate | 2026 |
| Atlas Portefølje 13 AS | Real estate | 2026 |
| Atlas Portefølje 2 AS | Real estate | 2018 |
| Atlas Portefølje 3 AS | Real estate | 2022 |
| Atlas Portefølje 4 AS | Real estate | 2023 |
| Atlas Portefølje 5 AS | Real estate | 2024 |
| Atlas Portefølje 6 AS | Real estate | 2024 |
| Atlas Portefølje 7 AS | Real estate | 2025 |
| Atlas Portefølje 8 AS | Real estate | 2025 |
| Atlas Portefølje 9 AS | Real estate | 2026 |
| Atlas Prosjekt 1 AS | Real estate | 2022 |
| Atlas Prosjekt 12 AS | Real estate | 2025 |
| Atlas Prosjekt 13 AS | Real estate | 2025 |
| Atlas Prosjekt 14 AS | Real estate | 2025 |
| Atlas Prosjekt 16 AS | Real estate | 2026 |
| Atlas Prosjekt 17 AS | Real estate | 2026 |
| Atlas Prosjekt 19 AS | Real estate | 2026 |
| Atlas Prosjekt 2 AS | Real estate | 2022 |
| Atlas Prosjekt 20 AS | Real estate | 2026 |
| Atlas Prosjekt 5 AS | Real estate | 2023 |
| Atlas Prosjekt 7 AS | Real estate | 2023 |
| Atlas Shop Da | Wholesale & retail | 2017 |
| Atlas Solutions AS | Professional & scientific | 2024 |
| Atlas Spedisjon AS | Transport & logistics | 2000 |
| Atlas Sport Ans | Wholesale & retail | 1995 |
| Atlas Storage AS | Real estate | 2022 |
| Atlas Taxi AS | Transport & logistics | 2015 |
| Atlas Technology Solutions Norway AS | Administrative & support | 2016 |
| Atlas Tour AS | Administrative & support | 2014 |
| Atlas Trefelling Og Trepleie AS | Agriculture & fishing | 2012 |
| Atlas VVS AS | Construction | 2026 |
| Atlas Wines AS | Wholesale & retail | 2022 |
| Atlas X AS | Administrative & support | 2021 |
| Atlaship & Partners AS | Transport & logistics | 2003 |
| Atlasian AS | | 2023 |
| Atlasklinikken AS | Health & social care | 2010 |
| Atle Aas AS | Professional & scientific | 2013 |
| Atle Fremstad Holding AS | | 2022 |
| Atle Gerhardsen Kunst AS | Arts & recreation | 2025 |
| Atle Hjorteset Holding AS | | 2020 |
| Atle Melbo Holding AS | Financial services | 2013 |
| Atle Myrhol Holding AS | Information & communication | 2017 |
| Atle Trondsen AS | Health & social care | 2011 |
| Atma Eiendom AS | Real estate | 2003 |
| Atmd AS | | 2023 |
| Atmosphere Innovation AS | Professional & scientific | 2019 |
| Atmt Holding AS | | 2024 |
| Atn AS | Administrative & support | 2002 |
| Atneosen Holding AS | | 2022 |
| Atnorth AS | Information & communication | 2017 |
| Ato Regnskap AS | Professional & scientific | 2009 |
| Ato Transport AS | Transport & logistics | 2024 |
| Atoe AS | Wholesale & retail | 2024 |
| Atoften Holding AS | Real estate | 2024 |
| Atoll AS | Financial services | 2026 |
| Atollo Holding AS | | 2021 |
| Atom Elektro AS | Construction | 2008 |
| Atp Arkitekter AS | Professional & scientific | 2011 |
| Atr 72 MSN 1341 AS | Administrative & support | 2017 |
| Atr Cleaning Services AS | Administrative & support | 2018 |
| Atris AS | Professional & scientific | 1998 |
| Atris Tay AS | Professional & scientific | 2022 |
| Atrium Bygg AS | Administrative & support | 2006 |
| Atrium Design & Trade AS | Wholesale & retail | 2010 |
| Atrium Eiendomsmegling AS | Real estate | 2024 |
| Atrium Vest AS | Real estate | 2009 |
| Atromitos AS | Wholesale & retail | 2024 |
| Atropical AS | Professional & scientific | 2020 |
| Atros Holding AS | | 2022 |
| Atryg AS | Real estate | 2019 |
| Atryg Holding AS | Real estate | 2019 |
| Atrym AS | Administrative & support | 2026 |
| Ats Eiendomsinvest AS | Real estate | 2011 |
| Ats Invest AS | | 2019 |
| Atsite AS | Professional & scientific | 2018 |
| Att Arkitektur AS | Professional & scientific | 2024 |
| Att AS | Transport & logistics | 2022 |
| Att Stays AS | Hospitality | 2021 |
| Att Verksgata AS | Real estate | 2024 |