| 180 Degrees AS | Other services | 2025 |
| 2N Montasje AS | Construction | 2012 |
| 50/50 Bedriftsrådgivning AS | Professional & scientific | 2025 |
| A Eng AS | Real estate | 1936 |
| A. Haukerud Invest AS | Financial services | 2013 |
| A/S Nycom | Manufacturing | 1988 |
| Aaeng Fjøsbutikk AS | Wholesale & retail | 2017 |
| Aanerud Invest AS | Manufacturing | 2017 |
| Aasum Bil AS | Other services | 1993 |
| Abaza Invest AS | Construction | 2020 |
| Abn Holding AS | Administrative & support | 2023 |
| Absolutt Byggservice AS | Construction | 2012 |
| Abureya Holding AS | Health & social care | 2020 |
| Accountify AS | Professional & scientific | 2017 |
| Ad Trykk Og Brodering AS | Wholesale & retail | 2022 |
| Add Value Sweden AB | Professional & scientific | 2015 |
| Advokat Nymoen AS | Professional & scientific | 2019 |
| Advokatfirmaet Mejdell Jakobsen AS | Professional & scientific | 2019 |
| Aedani Studio AS | Information & communication | 2025 |
| Aktiv Bemanning Norge AS | Administrative & support | 2008 |
| Aktiv Eiendomsmegling Kongsvinger AS | Real estate | 2004 |
| Aktiv IT Partner Nordic AS | Information & communication | 2020 |
| Al-Ma AS | Other services | 2017 |
| Alaa Aldin AS | Hospitality | 2024 |
| Alfa Nordic AS | Wholesale & retail | 2023 |
| Alfakraft Fonder Nuf | | 2016 |
| Allinclusive.No AS | Transport & logistics | 2012 |
| Als Holding AS | Administrative & support | 2026 |
| Alshab AS | Hospitality | 2024 |
| Altforreise AS | Wholesale & retail | 2025 |
| Alumont Service AS | Construction | 2014 |
| Amedia Forbrukersalg AS | Information & communication | 2003 |
| Amico AS | Wholesale & retail | 2003 |
| Amundvegen Eiendom AS | Real estate | 2020 |
| Anders Bidstrup AS | Wholesale & retail | 2024 |
| Andrava AS | Professional & scientific | 2025 |
| Andreas Solution AS | Professional & scientific | 2024 |
| Anf AS | Wholesale & retail | 2023 |
| Aparo Energi AS | Construction | 2008 |
| Aqevent AS | Real estate | 2022 |
| Aquagroup AS | Other services | 2016 |
| Ar Holding AS | Construction | 2016 |
| Arbeidsbutikken AS | Wholesale & retail | 2015 |
| Arkitektlaget AS | Professional & scientific | 2001 |
| Arne Hansen Musikksenter AS | Hospitality | 2018 |
| Arne Langnes Eiendom AS | Construction | 2004 |
| Arne Langnes Maskinentreprenør AS | Construction | 1988 |
| Arne Skyrud Takstforretning AS | Real estate | 2017 |
| Arnstein Storås Fysioterapi | Health & social care | 2013 |
| Arting Eiendom AS | Real estate | 2017 |
| Arvika Montage I Värmland AB | Construction | 1996 |
| AS Hofam | Agriculture & fishing | 1990 |
| AS Interno | Professional & scientific | 1981 |
| AS Kongsvinger Brenselforretning | Transport & logistics | 1954 |
| AS Kongsvinger Rørleggerservice | Construction | 1992 |
| Asfalt Og Anlegg AS | Construction | 2012 |
| Astrid Holding AS | Wholesale & retail | 2005 |
| Asutvikling AS | Administrative & support | 2022 |
| Aura Electric AS | Manufacturing | 2013 |
| Autocall AS | Professional & scientific | 2026 |
| Autoexperten Kongsvinger AS | Other services | 2021 |
| Ax Bygg AS | Construction | 2018 |
| Ax Næringseiendom AS | Real estate | 2019 |
| Axios AS | Professional & scientific | 2001 |
| B2 Science Park AS | Real estate | 2022 |
| Ba Gjenvinning AS | Water & waste | 1983 |
| Badstuen Eiendom AS | Real estate | 2006 |
| Baheer AS | Health & social care | 2025 |
| Bakli Eiendom AS | Real estate | 2014 |
| Balchengaarden AS | Real estate | 2013 |
| Banesikkerhet AS | Professional & scientific | 2009 |
| Bart Eiendom AS | Real estate | 2017 |
| Bassam AS | Hospitality | 2026 |
| Beergan AS | Manufacturing | 2022 |
| Bek Consulting AS | Health & social care | 2022 |
| Bemaco AS | Real estate | 1996 |
| Berger Retail Park AS | Real estate | 2011 |
| Bergers Tak AS | Construction | 2025 |
| Berggren Eiendom AS | Real estate | 2012 |
| Berit T. Moen AS | Health & social care | 2023 |
| Berntsen Kiosk AS | Wholesale & retail | 2015 |
| Betong Øst AS | Manufacturing | 1996 |
| Betong Øst Pumping AS | Manufacturing | 2020 |
| Betong Øst Trøndelag AS | Manufacturing | 2018 |
| Betongtransport Øst AS | Transport & logistics | 1998 |
| BG Kampen Turvogner AS | Transport & logistics | 2016 |
| Bidwintravel.Com AS | Administrative & support | 2012 |
| Bil & Husgass AS | Wholesale & retail | 2006 |
| Bilxtra Kongsvinger AS | Wholesale & retail | 2020 |
| Bjerketunet AS | Real estate | 2014 |
| BL Entreprenør AS | Construction | 2007 |
| Blen Holding AS | Construction | 2016 |
| Blomsterlill AS | Wholesale & retail | 2025 |
| Blowtech Group Nuf | Administrative & support | 2016 |
| Bo & Angas Trafikkskole Da | Education | 1989 |
| Boger Utvikling AS | Real estate | 2022 |
| Borten Eiendom AS | Real estate | 2016 |
| Borten Invest AS | | 2019 |
| Bovieran Holt AS | Real estate | 2021 |
| Bovieran Utbygging AS | Real estate | 2022 |