| Advalue Analytics AS | Information & communication | 2026 |
| Advokatene Schade Smith & Austad Da | Professional & scientific | 1993 |
| Advokatfirma Grande, Syvertsen & Co AS | Professional & scientific | 2013 |
| Advokatfirma Syvertsen AS | Professional & scientific | 2016 |
| Advokatfirma Sølverud AS | Professional & scientific | 2014 |
| Advokatfirmaet Duesund AS | Professional & scientific | 2015 |
| Advokatfirmaet Fulford Gilhuus Da | Professional & scientific | 2024 |
| Advokatfirmaet Hals AS | Professional & scientific | 2008 |
| Advokatfirmaet Jarnang AS | Professional & scientific | 2010 |
| Advokatfirmaet Kildebo AS | Professional & scientific | 2021 |
| Advokatfirmaet Vaghefi AS | Professional & scientific | 2017 |
| Advokatoriet AS | Professional & scientific | 2011 |
| Aeolus AS | Professional & scientific | 2014 |
| Aero Logics AS | Professional & scientific | 2006 |
| Africa for World Ans | Wholesale & retail | 2018 |
| AG Eiendomsinvest AS | Real estate | 2006 |
| AG Holding AS | Real estate | 2005 |
| Agaia AS | Administrative & support | 1987 |
| Agaia Group AS | Administrative & support | 2019 |
| Agder Totalentreprenør AS | Hospitality | 2023 |
| Agere AS | Information & communication | 2015 |
| Agev. AS | Professional & scientific | 2011 |
| Agi AS | Financial services | 2009 |
| Agihuga AS | Administrative & support | 2021 |
| Agilium Worldwide Norway AS | Administrative & support | 2017 |
| Agj Holding AS | Financial services | 2018 |
| Agmon AS | Wholesale & retail | 2018 |
| Agneta AS | Hospitality | 2011 |
| Agrim Invest AS | Information & communication | 2021 |
| Ags Eiendom Senter AS | Real estate | 2021 |
| Agusta Eiendom AS | Real estate | 1995 |
| Ah Bolig Og Hytter AS | Construction | 2021 |
| Ahj AS | | 2025 |
| AI Dental Teknikk AS | Health & social care | 2024 |
| Aiaiapp AS | Information & communication | 2026 |
| Aime Management AS | Professional & scientific | 2014 |
| Aisai Studio AS | Professional & scientific | 2023 |
| Aiyi Holding AS | Real estate | 2019 |
| Aj Horgens Vei 1-9 AS | Real estate | 2017 |
| Aja Forvaltning AS | Real estate | 1996 |
| Ak Arvid Knutsen Mur- Og Tømrermesterforretning AS | Construction | 1978 |
| Ak Autosalg AS | Wholesale & retail | 2024 |
| Ak Topco AS | Construction | 2023 |
| Akademiet Drammen AS | Education | 2002 |
| Akademiet Folkehøgskole Numedal AS | Education | 2026 |
| Akademiet Grunnskole Hokksund AS | Education | 2024 |
| Akademiet International School Drammen AS | Education | 2009 |
| Akademiet Privatist Og Nettstudier AS | Education | 2011 |
| Akademiet Privatistskole Drammen AS | Education | 2008 |
| Akademiet Realfagsskole Drammen AS | Education | 2013 |
| Akademiet Toppidrett Drammen AS | Education | 2024 |
| Akademiet Ungdomsskole Drammen AS | Education | 2014 |
| Akademiet Ungdomsskole Kongsberg AS | Education | 2026 |
| Akademiet Utdanning Norge AS | Education | 1999 |
| Akademiet VGS Bragernes Drammen AS | Education | 2011 |
| Akademiet VGS Hønefoss AS | Education | 2024 |
| Akademiet Ypsilon Videregående Skole AS | Education | 2005 |
| Akamai Invest AS | Financial services | 2015 |
| Akas Holding AS | | 2025 |
| Akesia AS | Health & social care | 2026 |
| Aks Holding AS | | 2005 |
| Akselvoll Invest AS | Manufacturing | 2005 |
| Aksena AS | Professional & scientific | 2012 |
| Aksjecompagniet AS | Real estate | 2005 |
| Aksjeklubben Fabelaktig AS | Financial services | 2013 |
| Aksnes Rør AS | Construction | 2022 |
| Aktiv 1 | Professional & scientific | 1995 |
| Aktiv Auto 9 AS | Wholesale & retail | 2020 |
| Aktiv CRM AS | Information & communication | 2013 |
| Aktiv Glede AS | Education | 2014 |
| Aktiv Veidrift AS | Construction | 2006 |
| Aktivfot AS | Health & social care | 2010 |
| Aktivo AS | Real estate | 2005 |
| Al Auto AS | Wholesale & retail | 2022 |
| Al Bjerknes Invest AS | | 2022 |
| Al Blikk Og Ventilasjon AS | Construction | 2013 |
| Al Dimashqi AS | Wholesale & retail | 2023 |
| Al Trafikkskole AS | Education | 2023 |
| Aladdin Gull, Sølv Og Mynter AS | Wholesale & retail | 2025 |
| Aladdin Holding AS | Wholesale & retail | 2025 |
| Alan Frisør AS | Other services | 2021 |
| Alant Invest AS | Wholesale & retail | 2005 |
| Alant Partners AS | Professional & scientific | 2026 |
| Albanor Eiendom AS | Real estate | 2021 |
| Albanor Holding AS | Real estate | 2019 |
| Albanor Isolering AS | Construction | 2019 |
| Albatross Design AS | Wholesale & retail | 2014 |
| Albatross Gruppen AS | Construction | 2019 |
| Albittar Transport AS | Transport & logistics | 2025 |
| Albjerk AS | Real estate | 2021 |
| Albjerk Bil AS | Wholesale & retail | 1985 |
| Albjerk Capital AS | Real estate | 2020 |
| Albjerk Holding AS | Real estate | 2005 |
| Albjerk Investment AS | | 2026 |
| Albjerk Investment Holding AS | | 2022 |
| Albjerk Property AS | Real estate | 2021 |
| Albo Holding AS | Professional & scientific | 2021 |
| Alc.Xyz AS | Arts & recreation | 2009 |
| Aleksander Motor AS | Wholesale & retail | 2007 |
| Alex Frisør AS | Other services | 2016 |