| Academic Business Focus AS | Financial services | 1997 |
| Academic Capital AS | Financial services | 2020 |
| Accelerate AS | Information & communication | 2000 |
| Accomodo Regnskap AS | Professional & scientific | 2006 |
| Accretion AS | Information & communication | 2006 |
| Acdb Holding AS | | 2026 |
| Acdb Holding II AS | | 2026 |
| Ace Capital AS | | 2026 |
| Acer Dixon AS | Education | 2017 |
| Acergy France SAS | Mining & quarrying | 1995 |
| Acfoto AS | Professional & scientific | 2019 |
| Acilles AS | Financial services | 2015 |
| Acom Elektro AS | Construction | 2018 |
| Acono AS | Professional & scientific | 2024 |
| Acquario AS | Professional & scientific | 2015 |
| Acs AS | Financial services | 2005 |
| Act PJ - Ideas AS | Professional & scientific | 2018 |
| Action Hub AS | Education | 2023 |
| Actium AS | Professional & scientific | 1997 |
| Active Invest AS | | 2025 |
| Active Marine AS | Professional & scientific | 2012 |
| Active Stavanger AS | Arts & recreation | 2016 |
| Activetainment AS | Wholesale & retail | 2012 |
| Acvarium AS | Information & communication | 2025 |
| Adams AS | Transport & logistics | 2025 |
| Adapt Holding Da | Professional & scientific | 2005 |
| Add Energy Group AS | Professional & scientific | 2007 |
| Addvant AS | Professional & scientific | 2024 |
| Addvant Partner AS | Professional & scientific | 2017 |
| Addvant Stavanger AS | Professional & scientific | 2021 |
| Adesa AS | | 2026 |
| Adeste AS | Real estate | 2005 |
| Adidel Invest AS | | 2021 |
| Adiungo AS | | 2012 |
| Adius Advokater Ans | Professional & scientific | 2006 |
| Adius Eiendom AS | Real estate | 2021 |
| Administra AS | Professional & scientific | 2026 |
| Administra Regnskap AS | Professional & scientific | 2020 |
| Adori AS | Transport & logistics | 2026 |
| Adriatico AS | Hospitality | 2017 |
| Adsign Holding AS | Professional & scientific | 2018 |
| Adsign Ideutvikling AS | Professional & scientific | 2019 |
| Adstica Capital AS | | 2020 |
| Adv Holding AS | Real estate | 2013 |
| Advanced Control - Power & Drives AS | Information & communication | 2021 |
| Advanced Control AS | Professional & scientific | 1997 |
| Advanced Control Robotic AS | Information & communication | 2000 |
| Adventis AS | Information & communication | 2015 |
| Advest Kontordrift AS | Administrative & support | 2019 |
| Advice IP AS | Professional & scientific | 2022 |
| ADVICE4YOU AS | Professional & scientific | 2013 |
| Advokat 1 AS | Administrative & support | 2012 |
| Advokat Arvid Berentsen AS | Professional & scientific | 2020 |
| Advokat Arvid Sjødin AS | Professional & scientific | 2021 |
| Advokat Gry Sørhus Mollan AS | Professional & scientific | 2016 |
| Advokat Hovda AS | Professional & scientific | 2019 |
| Advokat John Heitmann AS | Professional & scientific | 2013 |
| Advokat Monica Solberg-Leinebø AS | Professional & scientific | 2021 |
| Advokat Norge Internettservice Ans | Information & communication | 1997 |
| Advokat Sissel Knutsen Hegdal AS | Professional & scientific | 2010 |
| Advokat Sveinung Eliassen AS | Professional & scientific | 2018 |
| Advokat Ulrik Skramstad AS | Professional & scientific | 2024 |
| Advokatene Torstruplerum AS | Professional & scientific | 2023 |
| Advokatfirma Bull Årstad Da | Professional & scientific | 1995 |
| Advokatfirma Ebt AS | Professional & scientific | 2023 |
| Advokatfirma Mjaaland AS | Professional & scientific | 2019 |
| Advokatfirma Neergaard AS | Professional & scientific | 2024 |
| Advokatfirma Skretting AS | Professional & scientific | 2015 |
| Advokatfirma Staalesen AS | Professional & scientific | 2013 |
| Advokatfirma Sørskår Kontordrift | Professional & scientific | 2016 |
| Advokatfirma Tingmann AS | Professional & scientific | 2002 |
| Advokatfirma Voster AS | Professional & scientific | 2019 |
| Advokatfirmaet Aspøy AS | Professional & scientific | 2019 |
| Advokatfirmaet Legal AS | Professional & scientific | 2017 |
| Advokatfirmaet Ove Sørskår AS | Professional & scientific | 2022 |
| Advokatfirmaet Schwerdt AS | Professional & scientific | 2026 |
| Advokatfirmaet Sjødinmeling AS | Professional & scientific | 2023 |
| Advokatfirmaet Tindved AS | Professional & scientific | 2021 |
| Advokatfirmaet Torstrup AS | Professional & scientific | 2015 |
| Advokatfirmaet Verna Rege Nilssen AS | Professional & scientific | 2022 |
| Advokathuset Stavanger Eiendom AS | Real estate | 2014 |
| Advokathuset Veland Og Thingvold AS | Professional & scientific | 2016 |
| Advokatmekler Anett Ravndal AS | Professional & scientific | 2022 |
| Ae Byggdrift AS | Other services | 2020 |
| Ae Invest AS | Real estate | 2005 |
| Aea Eiendom AS | Professional & scientific | 2020 |
| Aeb Invest AS | Financial services | 2005 |
| Aegir Havbruk AS | Agriculture & fishing | 2001 |
| Aenas AS | | 2025 |
| Aeoeti AS | Professional & scientific | 2024 |
| Aeonian 33 AS | | 2024 |
| Aeonian 35 AS | | 2024 |
| Aeonian 36 AS | | 2024 |
| Aeonian 37 AS | | 2024 |
| Aeonian 39 AS | | 2024 |
| Aeonian 40 AS | | 2024 |
| Aeonian 41 AS | | 2024 |
| Aeonian 42 AS | | 2026 |
| Aeonian 43 AS | | 2026 |
| Aeonian 44 AS | | 2026 |