| 1LIFEAPP AS | Information & communication | 2014 |
| 1SB Jernbanekafeen AS | Hospitality | 2025 |
| 2315 Hamar AS | | 2025 |
| 2TEX AS | Financial services | 2005 |
| 3BSL AS | Real estate | 2008 |
| 51KOMMA5 AS | | 2024 |
| A & B Jernvare AS | Wholesale & retail | 1988 |
| A Blystad AS | Real estate | 1967 |
| A-Bygg 1 AS | Real estate | 2004 |
| A-Hjort AS | Wholesale & retail | 2014 |
| A. Helseth Holding AS | | 2024 |
| A. Vold Arkitektur AS | Professional & scientific | 2024 |
| A.O. Stenleggeren AS | Construction | 2013 |
| A1 Holding AS | Financial services | 2015 |
| A12 Invest AS | | 2019 |
| A90 Holding AS | Real estate | 2020 |
| Aaba Holding AS | Health & social care | 2005 |
| Aambakk Mejlbo Helse AS | Health & social care | 2021 |
| Aarskog Advokatfirma AS | Professional & scientific | 2015 |
| Aas Stillasservice AS | Construction | 2003 |
| Aase Consulting AS | Information & communication | 2008 |
| Aasen Og Aasen Invest AS | Real estate | 2022 |
| AB Invest A/S | Real estate | 1985 |
| Abactus AS | Real estate | 1993 |
| Abbas AS | Hospitality | 2016 |
| Abler AS | Real estate | 2021 |
| Activ Holding AS | Real estate | 2005 |
| Adekvat Regnskap & Rådgivning AS | Professional & scientific | 2003 |
| Adel's Kebab & Pizza Da | Hospitality | 2022 |
| Advokat Aabak AS | Professional & scientific | 2019 |
| Advokat Hanne Wesche AS | Professional & scientific | 2015 |
| Advokat Per Anders Løvsletten AS | Professional & scientific | 2009 |
| Advokat T. Madslangrud AS | Professional & scientific | 2018 |
| Advokatfirmaet Campbell & Co AS | Professional & scientific | 1999 |
| Advokatfirmaet Consensus Ans | Professional & scientific | 2010 |
| Advokatfirmaet Johnsrud & Co AS | Professional & scientific | 2002 |
| Advokatfirmaet Mageli Da | Professional & scientific | 1997 |
| Aero Consulting AS | Professional & scientific | 2022 |
| Aero Engineering AS | Professional & scientific | 2016 |
| Afeco AS | Construction | 2018 |
| AG Capital AS | | 2026 |
| Agape Eiendom AS | Real estate | 2020 |
| Agate Utvikling AS | Real estate | 2017 |
| Agelvik Games AS | Information & communication | 2021 |
| Agn Holding AS | Financial services | 2018 |
| Agreed AS | Information & communication | 2023 |
| Ah Mat AS | Hospitality | 2024 |
| Ah Mjølner AS | Construction | 2025 |
| Ajeel Barbershop AS | Other services | 2025 |
| Ajer Gårds Og Familiebarnehage AS | Education | 2026 |
| Ajerhagan 94 AS | Real estate | 2011 |
| Ake Bygg Og Fasade AS | Construction | 2022 |
| Akervalley AS | Professional & scientific | 2016 |
| Akevittruten AS | Administrative & support | 2011 |
| Aksebrudd Film AS | Information & communication | 2024 |
| Aktiv Eiendomsmegling Hamar AS | Real estate | 2016 |
| Aktiv Tannhelse AS | Health & social care | 2012 |
| Aladdin Hamar AS | Wholesale & retail | 2020 |
| Alarm Og Sikring AS | Construction | 2003 |
| Alee AS | | 2026 |
| Alf Viggo Johnsen Agentur AS | Wholesale & retail | 2009 |
| Alhaug Ortopedi AS | Health & social care | 2019 |
| Allconsept Ans | Real estate | 2000 |
| Alles Velvære Da | Other services | 2003 |
| Almas Invest AS | | 2026 |
| Aloha 2317 AS | Hospitality | 2020 |
| Alomo Holding AS | Financial services | 2018 |
| Alpha Lyr AS | Health & social care | 2022 |
| Alpinco Gondoltoppen AS | Real estate | 2018 |
| Alpine AS | | 2023 |
| Alsjø AS | Professional & scientific | 2019 |
| Alstra Holding AS | | 2026 |
| Altiore AS | Health & social care | 2021 |
| Altiusklinikken AS | Health & social care | 2011 |
| Aluveien 31 AS | Real estate | 2016 |
| Alvenes Dental AS | Health & social care | 2013 |
| Alzevo AS | Other services | 2026 |
| Amalies Verden AS | Wholesale & retail | 2014 |
| Ambassadeur Holding AS | Real estate | 2018 |
| Amd Eiendom AS | Real estate | 2026 |
| Amd Invest AS | Real estate | 2021 |
| Amd Medical AS | Health & social care | 2023 |
| Amedia Utvikling Hamar AS | Information & communication | 2020 |
| Amelo AS | Real estate | 2022 |
| Amerikavegen 19 Og 23 AS | Real estate | 2016 |
| Ammini AS | | 2021 |
| Amre Kolonial AS | Wholesale & retail | 2023 |
| Amund Kristiansen Invest AS | Financial services | 2017 |
| Anaconda AS | Wholesale & retail | 2011 |
| Anaconda Invest AS | Real estate | 2012 |
| Analytiq Intuition AS | | 2019 |
| Anders Gjermshus AS | Information & communication | 2013 |
| Andmark AS | Information & communication | 2025 |
| Andreas Pedersensgt 22 AS | Real estate | 2020 |
| Andrew Moss Helse AS | Health & social care | 2021 |
| Anesto AS | Wholesale & retail | 2017 |
| Angelberget AS | Real estate | 2021 |
| Animo Invest AS | | 2019 |
| Aninova AS | Professional & scientific | 2015 |
| Anitas Hund Og Katt AS | Wholesale & retail | 2011 |