| Abc Advisory AS | Professional & scientific | 2025 |
| Abc Clausen AS | Wholesale & retail | 2001 |
| Abc Consulting AS | Administrative & support | 2024 |
| Abc Dagligvarer AS | Wholesale & retail | 2014 |
| Abc Elite Padel AS | Education | 2025 |
| Abc Formidling AS | Wholesale & retail | 2024 |
| Abc Helse AS | Health & social care | 2009 |
| Abc Invest AS | Real estate | 1998 |
| Abc Kommunikasjon Egenutvikling Og Veiledning Da | Administrative & support | 1992 |
| Abc Konsulenten AS | Professional & scientific | 2006 |
| Abc Medisinske Senter Oslo AS | Health & social care | 2024 |
| Abc Nora AS | Real estate | 2024 |
| Abc Rør AS | Construction | 1987 |
| Abc Services AS | Information & communication | 2021 |
| Abc Startsiden AS | Information & communication | 1998 |
| Abc Tekstproduksjon AS | Arts & recreation | 1997 |
| Abc Trafikkskole AS | Education | 2019 |
| Abc Tømrerservice Djupvik Og Melvold Ans | Construction | 1986 |
| Abc-Web Da | Information & communication | 2004 |
| Abcc Holding AS | Real estate | 2015 |
| Abcd AS | Professional & scientific | 2025 |
| Abcf Invest AS | Financial services | 2005 |
| Abdalla Mazen Holding AS | | 2026 |
| Abdellaoui Holding AS | Manufacturing | 2022 |
| Abdille Transport AS | Transport & logistics | 2020 |
| Abdula Holding AS | | 2026 |
| Abdula Legetjenester AS | Health & social care | 2026 |
| Abdullahi Benonisen Da | Arts & recreation | 2021 |
| Abeco AS | Real estate | 1927 |
| Abeiendom Holding AS | Real estate | 2016 |
| Abeka AS | Real estate | 2005 |
| Abel Finans AS | Real estate | 1971 |
| Abel Holding AS | | 2025 |
| Abel Interiørarkitekter AS | Professional & scientific | 2019 |
| Abel Regnskap AS | | 2025 |
| Abel X AS | Information & communication | 2020 |
| Abello AS | Information & communication | 2015 |
| Abellund Garasjelag SA | Real estate | 1967 |
| Abelone AS | | 2025 |
| Abelsnes Invest AS | Real estate | 2004 |
| Abena Norge AS | Wholesale & retail | 1998 |
| Abene AS | Information & communication | 2007 |
| Aber Holding AS | | 2005 |
| Aberdeen Norinvest Epsilon Lier AS | Real estate | 2021 |
| Aberdeen Property Norinvest Beta AS | Real estate | 2014 |
| Aberdeen Property Norinvest Delta AS | Real estate | 2013 |
| Aberge Kuldeservice AS | Construction | 2023 |
| Aberia AS | Health & social care | 2010 |
| Aberia Voksentoppen AS | Health & social care | 2014 |
| Aberland Holding AS | | 2022 |
| Abeto Holding AS | Professional & scientific | 2014 |
| Abevents AS | Arts & recreation | 2019 |
| Abexworks AS | Information & communication | 2010 |
| Abexworks Services AS | Information & communication | 2024 |
| Abf AS | | 2022 |
| Abfw Invest AS | | 2018 |
| Abg Alternative Investments AS | Financial services | 2022 |
| Abg Alternative Investments Holding AS | Financial services | 2022 |
| Abg Business Management AS | Professional & scientific | 2018 |
| Abg Invest AS | Real estate | 2005 |
| Abg Real Estate Management AS | Real estate | 2021 |
| Abg Sundal Collier ASA | Financial services | 2001 |
| Abg Sundal Collier Holding ASA | Financial services | 1991 |
| Abg Urban Development Partner Fund AS | Financial services | 2017 |
| Abg Urban Development Partner Fund Sponsor AS | | 2017 |
| Abgundersen Venture AS | | 2019 |
| Abh-Holding AS | | 2021 |
| Abhi Holding AS | Financial services | 2005 |
| Abhorration Da | Information & communication | 2022 |
| Abi Consolidated AS | Real estate | 2014 |
| Abi Finance AS | Professional & scientific | 2026 |
| Abia Torres AS | Wholesale & retail | 2024 |
| Abif Tomtefeste I AS | Real estate | 2003 |
| Abif Tomtefeste I KS | Real estate | 2003 |
| Abif Tomtefeste I Løkketangen AS | Real estate | 2003 |
| Abildsø Aksjelag AS | | 2019 |
| Abildsø Elektriske AS | Construction | 1985 |
| Abildsø Fysio- Og Manuellterapi AS | Health & social care | 1999 |
| Abildsø Gård AS | Real estate | 1998 |
| Abildsø Legekontor AS | Health & social care | 2025 |
| Abildsø Legekontor Da | Health & social care | 2007 |
| Abildsø Menighetsbarnehage AS | Education | 2022 |
| Abildsø Trafikkopplæring AS | Education | 2020 |
| Abildsø Trafikkskole AS | Education | 2013 |
| Abilia AS | Wholesale & retail | 1985 |
| Abion AS | Professional & scientific | 2020 |
| Abiramy Cash & Carry AS | Wholesale & retail | 2013 |
| Abisco AS | Real estate | 2020 |
| Abit AS | Information & communication | 2024 |
| Abk Investments AS | | 2021 |
| Abk-Qviller AS | Wholesale & retail | 1991 |
| Abl Group Norway AS | Professional & scientific | 1991 |
| Abl Invest AS | Transport & logistics | 2023 |
| Able Solutions AS | Professional & scientific | 2019 |
| Able Trafikkskole AS | Education | 2021 |
| Abler Nordic AS | Financial services | 2008 |
| Abler Nordic Climate Smart Fund AS | Financial services | 2020 |
| Abler Nordic Fund IV KS | Financial services | 2019 |
| Abler Nordic Fund V KS | Financial services | 2024 |
| Abler Nordic GP IV AS | | 2018 |