| 1978 Invest AS | Transport & logistics | 2023 |
| 2HJUL Eiendom AS | Wholesale & retail | 2016 |
| 2S Tiller & Næss Malerservice - Jomfruslettfjell Hytteservice AS | Construction | 2016 |
| 369 Holding AS | Real estate | 2024 |
| 3N Invest AS | Real estate | 2018 |
| 4.FARM AS | Manufacturing | 2020 |
| 60 Grader Nord Kiropraktikk AS | Health & social care | 2006 |
| A Haug Invest AS | Real estate | 2015 |
| AB Bråsstorp Invest AS | Financial services | 2005 |
| Abacus Takst AS | Real estate | 2011 |
| Abc Holding AS | Financial services | 2018 |
| Able Business Partner AS | Professional & scientific | 2021 |
| Abundia AS | Professional & scientific | 2021 |
| Academy Invest AS | | 2024 |
| Adcommitto AS | Administrative & support | 1997 |
| Addenda Consult AS | Professional & scientific | 1998 |
| Addetto Eiendom AS | Real estate | 2020 |
| Aden Market AS | Wholesale & retail | 2026 |
| Adi Invest AS | Professional & scientific | 2016 |
| Adisor Rettshjelp AS | Professional & scientific | 2022 |
| Adminconsult AS | Professional & scientific | 2023 |
| Adoniram AS | Real estate | 2023 |
| Adrenalinevent AS | Administrative & support | 2004 |
| Advance Eiendom AS | Real estate | 2012 |
| Advokat Camilla Kvaksrud AS | Professional & scientific | 2017 |
| Advokat Hanne Lilleby AS | Professional & scientific | 2005 |
| Advokat Jan Hammerseng AS | Professional & scientific | 2008 |
| Advokat Maria Novotna AS | Professional & scientific | 2018 |
| Advokat Wenche Løset AS | Professional & scientific | 2010 |
| Advokatene Storgata 2 Ans | Professional & scientific | 2001 |
| Advokatfirma Lohne Krokeide AS | Professional & scientific | 2004 |
| Advokatfirmaet Sopp Onsrud AS | Professional & scientific | 2020 |
| Aghdam Eiendom AS | Real estate | 2020 |
| Aghdam Helsetjenester AS | Health & social care | 2020 |
| Agility Fuel Solutions Norway AS | Manufacturing | 2014 |
| Agkh AS | Construction | 2024 |
| Ags Holding Gjøvik AS | Real estate | 2015 |
| Aiba AS | Information & communication | 2022 |
| Ajb Holding AS | Real estate | 2005 |
| Ajer Eiendom AS | Real estate | 1982 |
| Ake Invest AS | Construction | 2005 |
| Akke Holding AS | Financial services | 2015 |
| Ako Eindom AS | Real estate | 2019 |
| Aks AS | Wholesale & retail | 2020 |
| Aks Eiendom AS | Real estate | 2010 |
| Aks Kapital AS | | 2024 |
| Akses AS | | 2005 |
| Aksji AS | Financial services | 2016 |
| Aktiv Eiendom AS | Real estate | 2001 |
| Aktiv Fasade AS | Construction | 2020 |
| Aktiv Gjøvik Land Toten AS | Real estate | 2019 |
| Aladdin Gjøvik AS | Wholesale & retail | 2025 |
| Aldri Alene AS | Administrative & support | 2020 |
| Aleo AS | | 2025 |
| Alfaelkida AS | Construction | 1993 |
| Alfarveien 20 AS | Real estate | 2002 |
| All Consult AS | Professional & scientific | 1999 |
| All in Web Consult AS | Professional & scientific | 2014 |
| All-In Live Concept AS | Administrative & support | 2023 |
| Allmed AS | Health & social care | 2025 |
| Alou AS | | 2021 |
| Alphaspar AS | Financial services | 2008 |
| Altero AS | Professional & scientific | 1997 |
| Altero Eiendom AS | Real estate | 2020 |
| Alvera Helse AS | Health & social care | 2026 |
| Ambjør AS | | 2026 |
| Amelti Holding AS | Professional & scientific | 2008 |
| Amg Eie AS | Real estate | 2012 |
| Amsrudsvingen 1 AS | Real estate | 2026 |
| Amundsen Spesial Gjøvik AS | Wholesale & retail | 2024 |
| Amundsen Sport AS | Wholesale & retail | 1991 |
| An E-Academy AS | Education | 2024 |
| An Eacademy AS | Education | 2023 |
| Anax Holding AS | Real estate | 2006 |
| Anders Hasle Holding AS | Financial services | 2005 |
| Anders Myhre Holding AS | Financial services | 2013 |
| Anders Wien Holding AS | Financial services | 2014 |
| Andersson-Eiendom AS | Real estate | 1980 |
| Aneo Retail AS | Professional & scientific | 2008 |
| Aneo Retail International AS | Professional & scientific | 2021 |
| Anglo Oversetterservice Ans | Administrative & support | 1989 |
| Ankr Rådgivning AS | Professional & scientific | 2016 |
| Anmaroli Holding AS | | 2023 |
| Anmatec Norge Nuf | Professional & scientific | 2013 |
| Anne Holding AS | | 2013 |
| Annell AS | Wholesale & retail | 2004 |
| Annomann Jim Svedberg | Other services | 1999 |
| Another AS | | 2024 |
| Ans Fredheim Vidregående Skole Kantina Kari Aasheim Og Vigdis Tomtsveen | Hospitality | 1991 |
| Ans Hadelandsvn 2 | Real estate | 1990 |
| ANS Kopiutleie, R.Lekang og T. Linnerud | Administrative & support | 1988 |
| Antonsen Eiendom Og Utleie Holding AS | | 2022 |
| Apex Finance AS | | 2023 |
| Apl Group AS | Professional & scientific | 2022 |
| Apn Harvest AS | Construction | 2024 |
| Apn Holding AS | Construction | 2020 |
| Apogee AS | Information & communication | 2022 |
| Apotekergården Dokka AS | Real estate | 2007 |
| Applaus AS | Real estate | 2007 |
| Aquanovo Premium Center AS | Other services | 2019 |