| Asker Kroen Catering AS | Hospitality | 2024 |
| Asker Legesenter AS | Real estate | 2002 |
| Asker Leilighetsbygg AS | Real estate | 2014 |
| Asker Massasje AS | Other services | 2017 |
| Asker Massemottak AS | Water & waste | 2014 |
| Asker Matbar AS | Hospitality | 2024 |
| Asker Næringseiendom AS | Real estate | 2017 |
| Asker Næringseiendom Invest AS | Real estate | 2017 |
| Asker Og Bærum Anlegg AS | Administrative & support | 2005 |
| Asker Og Bærum Boligutvikling AS | Real estate | 2019 |
| Asker Og Bærum Regnskap SA | Professional & scientific | 1985 |
| Asker Og Bærum Sykepleieservice Ans | Health & social care | 2000 |
| Asker Og Bærum Turbusser AS | Transport & logistics | 2019 |
| Asker Osteopatiske Klinikk AS | Health & social care | 2007 |
| Asker Pizza AS | Hospitality | 2024 |
| Asker Produkt AS | Health & social care | 1991 |
| Asker PT AS | Education | 2020 |
| Asker Reisebyrå AS | Administrative & support | 2006 |
| Asker Sentrum AS | Other services | 1991 |
| Asker Sentrum Utvikling AS | Real estate | 2021 |
| Asker Sommer & Vinter Tjenester AS | Other services | 2026 |
| Asker Spesialistklinikk AS | Health & social care | 2022 |
| Asker Supermarked AS | Wholesale & retail | 2022 |
| Asker Sykkelservice AS | Other services | 2019 |
| Asker Takstfirma AS | Construction | 2005 |
| Asker Takstforum AS | Professional & scientific | 1999 |
| Asker Tankship 1 AS | Transport & logistics | 2024 |
| Asker Tankship 10 AS | Transport & logistics | 2026 |
| Asker Tankship 2 AS | Transport & logistics | 2024 |
| Asker Tankship 3 AS | Transport & logistics | 2024 |
| Asker Tankship 4 AS | Transport & logistics | 2024 |
| Asker Tankship 5 AS | Transport & logistics | 2024 |
| Asker Tankship 6 AS | Transport & logistics | 2024 |
| Asker Tankship 7 AS | Transport & logistics | 2024 |
| Asker Tankship 8 AS | Transport & logistics | 2025 |
| Asker Tankship 9 AS | Transport & logistics | 2025 |
| Asker Tannhelse AS | Health & social care | 2011 |
| Asker Tannlegevakt AS | Health & social care | 2021 |
| Asker Tannregulering AS | Health & social care | 2025 |
| Asker Tilhenger Service AS | Other services | 2021 |
| Asker Toppfotball AS | Arts & recreation | 2021 |
| Asker Tømrerservice AS | Construction | 2020 |
| Asker Urforretning AS | Wholesale & retail | 2017 |
| Asker Ønh AS | Health & social care | 2020 |
| Asker Øyelegesenter AS | Health & social care | 1999 |
| Askergutta Eiendom AS | Real estate | 2024 |
| Askergynekologen AS | Health & social care | 2019 |
| Askergynekologen Kristin Ramm AS | Health & social care | 2023 |
| Askerladden Kultur AS | Information & communication | 2021 |
| Askerlegene AS | Health & social care | 2019 |
| Askerlogopeden Limited Nuf | Health & social care | 2011 |
| Askerpsykologene AS | Health & social care | 2026 |
| Askertannlegene AS | Health & social care | 2008 |
| Askerveien 50 AS | Real estate | 2021 |
| Askium AS | Professional & scientific | 2024 |
| Asla-Holding AS | | 2005 |
| Aslak Og Magne AS | Real estate | 2017 |
| Asle P Entreprenør AS | Construction | 1994 |
| Aso Risk Management AS | Professional & scientific | 2019 |
| Asp Norge AS | Wholesale & retail | 2018 |
| Ast Eiendom AS | Real estate | 2026 |
| Astrups.Com AS | Professional & scientific | 2005 |
| Asun AS | Professional & scientific | 2018 |
| Atelier 3 AS | Other services | 1999 |
| Atento AS | | 2019 |
| ATOQ42 AS | Professional & scientific | 2018 |
| Atrevida AS | Financial services | 2020 |
| Ats Consulting AS | Information & communication | 1998 |
| Atski AS | | 2015 |
| Atstern AS | Wholesale & retail | 2026 |
| Attica Exploration AS | Mining & quarrying | 2021 |
| Auditheroes AS | Information & communication | 2025 |
| Aurora Consult AS | Professional & scientific | 2022 |
| Av Signage AS | Information & communication | 2025 |
| Ava AS | Real estate | 1991 |
| Ava Eiendom AS | Real estate | 2006 |
| Ava Eiendomsdrift AS | Real estate | 2011 |
| Ava Eiendomsforvaltning AS | Real estate | 1992 |
| Ava Eiendomspartner AS | Real estate | 2009 |
| Ava Invest AS | Real estate | 1989 |
| Ava Investor 10 AS | Real estate | 2016 |
| Ava Investor 2 AS | Real estate | 2006 |
| Ava Investor 21 AS | | 2021 |
| Ava Investor 23 AS | | 2023 |
| Ava Investor 4 AS | Real estate | 2011 |
| Ava Investor AS | Real estate | 2004 |
| Avanti Invest AS | | 2022 |
| Avbregda AS | | 2024 |
| Avio AS | Construction | 2019 |
| Avnet Nortec AS | Wholesale & retail | 1992 |
| Avonity Invest AS | | 2026 |
| Awer Norge AS | Professional & scientific | 2022 |
| Awr AS | | 2019 |
| Axis Communications Norge AS | Manufacturing | 2014 |
| Asker Trelast A/S | Wholesale & retail | 1983 |
| B-Stedt of Norway AS | Wholesale & retail | 1997 |
| B. Corneliussen Consulting AS | Professional & scientific | 2025 |
| B. R. Totalprosjekt Da | Construction | 2005 |
| B.E. Bygg Da | Administrative & support | 2005 |
| Babliss AS | Manufacturing | 2015 |