| 140CONSULT AS | Information & communication | 2013 |
| 1905 Invest AS | Real estate | 2005 |
| 24 Lønnsom AS | Professional & scientific | 2020 |
| 24/7 Athlete AS | Arts & recreation | 2023 |
| 3 TS Holding AS | Manufacturing | 2015 |
| 3 TS Industriservice AS | Manufacturing | 1995 |
| 5895 Invest AS | Professional & scientific | 1997 |
| 5T Style AS | Other services | 2021 |
| 911 Party Fund AS | | 2026 |
| A & B Eiendom AS | Real estate | 2014 |
| A J Mohn AS | Wholesale & retail | 1985 |
| A M Holding AS | Wholesale & retail | 2020 |
| A Steen Holding AS | Financial services | 2005 |
| A&G Eiendom AS | Real estate | 2025 |
| A-Tri AS | Real estate | 2005 |
| A/L Saksumdal Bygdahus | Real estate | 1995 |
| Aab Holding AS | Real estate | 2021 |
| Aabakken Holding AS | Financial services | 2011 |
| Aarstad & Bjørnhaug Bemanning AS | Administrative & support | 2026 |
| Aarstad & Bjørnhaug Invest AS | Real estate | 2021 |
| Aasen Skog Ans | Real estate | 2004 |
| Abc-Dyreklinikk Lillehammer AS | Professional & scientific | 2013 |
| Abw AS | Financial services | 2015 |
| Ad Notam AS | | 2025 |
| Ada Data Norge | Information & communication | 2000 |
| Adept Invest AS | | 2025 |
| Adi Studio AS | Professional & scientific | 2026 |
| Adlar AS | Administrative & support | 2020 |
| Adlar Lillehammer AS | | 2020 |
| Adlar Oslo AS | | 2020 |
| Advice Lillehammer AS | Professional & scientific | 2024 |
| Advokat Christian Wefling AS | Professional & scientific | 2009 |
| Advokatfirmaet Alver AS | Professional & scientific | 2007 |
| Advokatfirmaet Berg AS | Professional & scientific | 2017 |
| Advokatfirmaet Brandhaug AS | Professional & scientific | 2022 |
| Advokatfirmaet Kolden Og Ringerud AS | Professional & scientific | 2000 |
| Advokatfirmaet Nystuen & Bøen AS | Professional & scientific | 2014 |
| Advokatfirmaet Stine Rigmor Grimstad AS | Professional & scientific | 2022 |
| Advokatfirmaet Thallaug Ans | Professional & scientific | 1988 |
| Advokatgården Lillehammer AS | Real estate | 1999 |
| Aguila Sport AS | Wholesale & retail | 2016 |
| Aha-Kvalitet AS | Professional & scientific | 2013 |
| AI Dogtech AS | Manufacturing | 2023 |
| Ajanus AS | | 2022 |
| Akjp AS | | 2020 |
| Aktiv Flyt AS | Education | 2024 |
| Aktiva Capital AS | Financial services | 2018 |
| Aktive Regnskap Og Lønn AS | Professional & scientific | 2024 |
| Aktive Stoler AS | Wholesale & retail | 2023 |
| Aktivklinikken Lillehammer AS | Health & social care | 2001 |
| Alf Østbye Holding AS | Real estate | 2019 |
| Alfstad Holding AS | | 2021 |
| Alm's Barnemanufaktur Ans | Wholesale & retail | 1996 |
| Almshøgda AS | Wholesale & retail | 2008 |
| Also Known AS | Professional & scientific | 2016 |
| Altis AS | Professional & scientific | 2026 |
| Alver Holding AS | Professional & scientific | 2007 |
| Alver Økonomipartner AS | Professional & scientific | 2015 |
| Alveral AS | | 2017 |
| Amadeus Studio AS | Information & communication | 1995 |
| Amdahl Invest AS | Professional & scientific | 2022 |
| Amho Holding AS | | 2020 |
| Amina Transport AS | Administrative & support | 2010 |
| Amm Holding AS | Professional & scientific | 2005 |
| Amors Blomster Og Gaver Ans | Wholesale & retail | 1991 |
| Amplitude AS | Arts & recreation | 2017 |
| Amplitude AS | Professional & scientific | 2025 |
| Andreassen Blomster AS | Wholesale & retail | 2019 |
| Andreassen Byggtjenester AS | Professional & scientific | 2011 |
| Andresen Ur-Optikk AS | Wholesale & retail | 2007 |
| Andrå Utmarkslag Ba | Agriculture & fishing | 1995 |
| Angvik Invest Holding AS | | 2025 |
| Anjo AS | Financial services | 1996 |
| Anlegg Øst Entreprenør AS | Construction | 2013 |
| Anleggsgartner J. Barlund AS | Administrative & support | 2024 |
| Ans Gudbrandsdalsveien 203 | Real estate | 1991 |
| Ans Lillehammer Kolon | Administrative & support | 1989 |
| Anton & James Bokhandel AS | Wholesale & retail | 2022 |
| Aparta Eiendom AS | Real estate | 2006 |
| Apparo AS | Information & communication | 2025 |
| Aqua Pharma AS | Wholesale & retail | 2001 |
| Aqua Pharma Group AS | Professional & scientific | 2019 |
| Aquatech AS | Manufacturing | 2011 |
| Aquatiq AS | Wholesale & retail | 2001 |
| Aquatiq Group AS | Real estate | 2001 |
| Aran AS | Administrative & support | 2012 |
| Arbon AS | Professional & scientific | 2013 |
| Arci AS | Real estate | 1987 |
| Arek-Construction AS | Construction | 2022 |
| Arimeli Holding AS | | 2025 |
| Ark Bygg Og Interiør AS | Construction | 2014 |
| Arkide AS | Professional & scientific | 2013 |
| Arkitekt-Hus AS | Professional & scientific | 2024 |
| Arkitektkontoret Streken AS | Professional & scientific | 2005 |
| Arkkon AS | Professional & scientific | 1998 |
| Arlitek AS | Arts & recreation | 2024 |
| Armentum AS | Financial services | 2017 |
| Arne Bergseng AS | Wholesale & retail | 2005 |
| Arne Olav Berg AS | Real estate | 2006 |
| Arnfinn Johansen Invest AS | Real estate | 2021 |