| AS Vidsjå | Real estate | 1987 |
| AS Villabygg I | Households | 1947 |
| AS Vingaard | | 2019 |
| AS Vogtsg 53 | Real estate | 1983 |
| AS Vollebekk Boliglag | Households | 1950 |
| AS Vestgrænsen Nr 8 | Households | 1929 |
| AS Vidarsgate 18 | Households | 1929 |
| AS Vårnes | Real estate | 1959 |
| AS Væringskleven NR 1 | Households | 1934 |
| AS Vøyensvingen 15 | Households | 1952 |
| AS WDM Thranesgt 8 | Households | 1953 |
| AS Webergs Boktrykkeri | Manufacturing | 1921 |
| AS Wilfa | Wholesale & retail | 1969 |
| AS Wingana | Financial services | 1913 |
| AS Witex | Wholesale & retail | 1980 |
| AS Wilhelmsgate 2B | Households | 1933 |
| AS Ystad Børst Og Brennevin | Wholesale & retail | 2019 |
| AS Zenta | | 1984 |
| AS Årvollveien 15 | Real estate | 1962 |
| AS Åsane Senter | Real estate | 1971 |
| AS Østenfjeldske Merkantile Bureau | Professional & scientific | 2021 |
| AS Øvre Foss 6 | Households | 1938 |
| AS Øvre Slottsgate 7 | Real estate | 1912 |
| Asad AS | Wholesale & retail | 1995 |
| Asaevig Holding AS | | 2022 |
| Asaf Invest AS | | 2022 |
| Asag AS | Financial services | 2017 |
| Asakar AS | Professional & scientific | 2024 |
| Asam Invest AS | Hospitality | 2023 |
| Asap Consulting AS | Information & communication | 2007 |
| Asapp! AS | Information & communication | 2025 |
| Asatak AS | Professional & scientific | 2021 |
| Asb Grunland Filial Av Utenlandsk Foretak Nuf | | 1995 |
| Asb Kjøkken&Interiør AS | Wholesale & retail | 2016 |
| Asb Prosjekt Og Eiendom AS | Professional & scientific | 2017 |
| Asbestos and Environmental Analysis AS | Professional & scientific | 2021 |
| Asbjørn Dagestad AS | Wholesale & retail | 1994 |
| Asbjørn Madsstuen Eiendom AS | | 2020 |
| Asbjørnsen Nordic Consulting AS | Professional & scientific | 2023 |
| Asc AS | Financial services | 2020 |
| Asc Eiendomsutvikling AS | Real estate | 2008 |
| Ascando Partners AS | Professional & scientific | 2025 |
| Ascend AS | Information & communication | 2005 |
| Ascendant AS | | 2025 |
| Ascender AS | Professional & scientific | 2014 |
| Ascendia Invest AS | Real estate | 2017 |
| Ascending AS | Professional & scientific | 2011 |
| Ascendio Invest AS | | 2020 |
| Ascens Ans | Professional & scientific | 2001 |
| Ascension AS | Professional & scientific | 2020 |
| Ascensus AS | Real estate | 2018 |
| Ascent Anode AS | Professional & scientific | 2021 |
| Ascent Graphite AS | Mining & quarrying | 2021 |
| Ascent Norway AS | Administrative & support | 2021 |
| Ascent Technology AS | Professional & scientific | 2021 |
| Aschehoug AS | Information & communication | 2025 |
| Aschehoug Holding AS | | 2025 |
| Aschim Holding AS | Wholesale & retail | 2016 |
| Asco Utleie AS | Real estate | 2017 |
| Ascolta AS | Health & social care | 2019 |
| Ascom (Norway) AS | Wholesale & retail | 1968 |
| Asd Eiendom AS | Real estate | 2024 |
| Asd Holding AS | Construction | 2024 |
| Asdaal Group AS | Hospitality | 2011 |
| Asdiva AS | | 2024 |
| Ase AS | Real estate | 2017 |
| Ase Utemiljø AS | Construction | 2025 |
| Aseb AS | | 2025 |
| Aseco Container Services AS | Transport & logistics | 1975 |
| Asekto Invest AS | | 2024 |
| Asel Holding AS | | 2026 |
| Asellus Holding AS | Financial services | 2012 |
| Asenat AS | Wholesale & retail | 2006 |
| Asenso AS | Professional & scientific | 2002 |
| Aser Mat AS | Wholesale & retail | 2015 |
| Aseso AS | Professional & scientific | 2013 |
| Asf Invest AS | | 2011 |
| Asf Investco AS | | 2023 |
| Asfaltdekke AS | Construction | 1992 |
| Asftyapp AS | Information & communication | 2025 |
| Asg AS | Real estate | 2012 |
| Asgard Capital AS | Real estate | 2017 |
| Asgard Ventures AS | | 2024 |
| Asgaut Moe Consulting AS | Professional & scientific | 2014 |
| Asgeirsson Invest AS | | 2026 |
| Asghar Eiendom AS | Real estate | 2016 |
| Ash & Thorns SA | Arts & recreation | 2021 |
| Ashcroft & Flowers AS | Financial services | 2017 |
| Ashe Holding AS | | 2026 |
| Ashe Sports AS | Wholesale & retail | 2009 |
| Asheim Investments AS | | 2005 |
| Ashfield Healthcare Nuf | Professional & scientific | 2006 |
| Ashkezari AS | | 2026 |
| Ashna Consulting AS | Professional & scientific | 2021 |
| Ashu Eiendom AS | Real estate | 2005 |
| Ashwood AS | Real estate | 2006 |
| Asia AS | Hospitality | 1986 |
| Asia Capital AS | Professional & scientific | 2015 |
| Asia Engros AS | Wholesale & retail | 2007 |
| Asia Food & Gourmet Da | Wholesale & retail | 2003 |