| Aktiv Sikkerhetssystemer Ans | Wholesale & retail | 1992 |
| Aktiv Utleiepartner AS | Administrative & support | 2006 |
| Aktiv Åpen Barnehage AS | Education | 2015 |
| Aktivgruppen AS | Administrative & support | 2010 |
| Aktivitetsklinikken AS | Health & social care | 2013 |
| Aktor Entreprenør AS | Construction | 2022 |
| Akuttlegene AS | Education | 2019 |
| Akuttvakta AS | Health & social care | 2023 |
| Akvakam AS | Professional & scientific | 2025 |
| Al-Holding AS | Real estate | 2020 |
| Alacris AS | Professional & scientific | 2021 |
| Aladdins Lampe AS | Wholesale & retail | 2001 |
| Alaska Sport AS | Real estate | 2005 |
| Alaturka AS | Administrative & support | 2013 |
| Alau Invest AS | | 2025 |
| Albaraka AS | Wholesale & retail | 2014 |
| Albert & Værnes Smart Service AS | Administrative & support | 2025 |
| Albert E. Olsen AS | Real estate | 2011 |
| Albireo AS | | 2005 |
| Albuskjell AS | Real estate | 2021 |
| Alderslyst IT AS | Information & communication | 2016 |
| Alea Iacta Est Invest AS | | 2025 |
| Aleksander Eriksen Holding AS | | 2026 |
| Alex Olsen Invest AS | Professional & scientific | 2019 |
| Alexander Hildrum AS | Hospitality | 2026 |
| Alf M. Andersen AS | Financial services | 2005 |
| Alfa Beta Forlag AS | Information & communication | 2020 |
| Alfa Glass AS | Other services | 2012 |
| Alfaset Utvikling AS | Real estate | 2013 |
| Alfastrategi AS | Professional & scientific | 2025 |
| Alg 13 AS | Real estate | 2020 |
| Algrin AS | Administrative & support | 2020 |
| Ali Baba Falafel AS | Hospitality | 2017 |
| Alice AS | | 1997 |
| Alida One AS | Information & communication | 2025 |
| Aligma Tattoo Nuf | Other services | 2014 |
| Aliona Vask AS | Real estate | 2012 |
| Alitas Holdings AS | Real estate | 2020 |
| All Good Clean Records AS | Wholesale & retail | 2017 |
| All in 1 Rengjøring Da | Administrative & support | 2010 |
| All Italian Wear AS | Wholesale & retail | 2014 |
| All Revisjon AS | Professional & scientific | 1994 |
| All-Rørfornying AS | Construction | 2019 |
| Allauto AS | Transport & logistics | 2023 |
| Alle Stelle AS | | 2021 |
| Allgoodall AS | | 2019 |
| Allianse Psykologklinikk AS | Health & social care | 2023 |
| Allisson Holding AS | Information & communication | 2017 |
| Allnevro AS | Health & social care | 2018 |
| Allsidig Arkitekt AS | Professional & scientific | 2016 |
| Allskog Bio AS | Manufacturing | 2008 |
| Allskog Entreprenør AS | Agriculture & fishing | 2014 |
| Allskog SA | Wholesale & retail | 2005 |
| Allvit AS | Information & communication | 2014 |
| Alm Kapital AS | Real estate | 2003 |
| Almaas & Svedahl Byggefirma AS | Construction | 2014 |
| Almli Spesial AS | Transport & logistics | 2024 |
| Almox Invest AS | | 2026 |
| Alna Utvikling AS | Real estate | 2011 |
| Aloe Vera Holding AS | | 2022 |
| Aloha Designkontor AS | Professional & scientific | 2012 |
| Alpha Security Da | Administrative & support | 2005 |
| Alphabet Consulting AS | Professional & scientific | 2002 |
| Alphastar AS | Information & communication | 2022 |
| Alpine Ventures AS | | 2024 |
| Alra AS | | 2021 |
| Alstad Holding AS | Wholesale & retail | 2005 |
| Alstadgården AS | Real estate | 2000 |
| Altera Infrastructure Coop Holdings L.L.C. Nuf | Mining & quarrying | 2021 |
| Altera Infrastructure Production AS | Mining & quarrying | 1986 |
| Altera Infrastructure Production Crew AS | Administrative & support | 2010 |
| Altera Infrastructure Voyageur AS | Transport & logistics | 2006 |
| Altera Knarr AS | Mining & quarrying | 2011 |
| Altes AS | | 2022 |
| Altieik AS | Manufacturing | 2005 |
| Altino AS | Wholesale & retail | 2010 |
| Alto Eiendom AS | Construction | 2003 |
| Altus Invest AS | Real estate | 2017 |
| Alujohn AS | | 2026 |
| Aluram Salg AS | Wholesale & retail | 2010 |
| Alva Industries AS | Manufacturing | 2017 |
| Alvar Og Maija AS | Wholesale & retail | 2000 |
| Alvaron AS | Health & social care | 2022 |
| Always Invest AS | Hospitality | 2010 |
| Alx Invest AS | | 2020 |
| Am Holdings AS | | 2025 |
| Am Larsen Forlag AS | Education | 2012 |
| Amadeus Investment AS | | 2020 |
| Amadeus Kapital AS | Real estate | 2016 |
| Amaleon AS | Professional & scientific | 2014 |
| Amanda Ulsund AS | Health & social care | 2022 |
| Amarillo AS | Administrative & support | 2005 |
| Amass AS | | 2021 |
| Ambia AS | Professional & scientific | 2020 |
| Ambient AS | Real estate | 2023 |
| Ambrosias Skattkammer Da | Wholesale & retail | 1996 |
| Ambulerende Optiker Christian G. Hermansen AS | Health & social care | 2025 |
| Amdahl Bil AS | Wholesale & retail | 2022 |
| Amdam AS | Information & communication | 2017 |
| Amehsp AS | Transport & logistics | 2025 |